Method and device for magnetic image formation

Claim 2

In a method of operating a device for storing magnetic recordings, of the type including a raster formed of alternating portions of a hard magnetic material of relatively low permeability and of a material of a relatively high permeability which is temperature dependent within the range of operating temperatures of said recording means, the steps of subjecting said raster at a predetermined temperature in the vicinity of the Curie point of said material of relatively high permeability to a magnetic field; and sweeping said raster at a temperature below said predetermined temperature.

Claim 3

In a method of preparing a latent image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected characteristic of an image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the selected characteristics of said image to be reproduced.

Claim 4

In a method of preparing a latent image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected characteristic of an image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the selected characteristics of said image to be reproduced.

Claim 5

In a method of preparing a latent halftone image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected characteristic of an image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the selected characteristics of said image to be reproduced.

Claim 6

In a method of preparing a latent halftone image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected characteristic of an image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the selected characteristics of said image to be reproduced.

Claim 7

In a method of preparing a latent image of a colored image to be reproduced, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a color separation of said colored image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the color separations of said colored image to be reproduced.

Claim 8

In a method of preparing a latent image of a colored image to be reproduced, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the magnetic characteristics of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a color separation of said colored image to be reproduced, so as to change the magnetic characteristics of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the magnetic characteristics of which have been changed corresponds to the distribution of the color separations of said colored image to be reproduced.

Claim 9

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency wHich is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials to the permeabilities of which have been changed forms a pattern corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by applying thereto magnetic dyestuffs corresponding to said color separations at said respective predetermined temperatures.

Claim 10

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency wHich is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials to the permeabilities of which have been changed forms a pattern corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by applying thereto magnetic dyestuffs corresponding to said color separations at said respective predetermined temperatures.

Claim 11

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern of magnetic forces of different strength corresponding to the distribution of the color separations of said colored image to be reproduced.

Claim 12

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; and heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern of magnetic forces of different strength corresponding to the distribution of the color separations of said colored image to be reproduced.

Claim 13

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern of magnetic forces of different strength corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by attracting thereto magnetic dyestuffs corresponding to said color separations at said respective predetermined temperatures from different distances corresponding to the different strengths of Said magnetic forces.

Claim 14

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern of magnetic forces of different strength corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by attracting thereto magnetic dyestuffs corresponding to said color separations at said respective predetermined temperatures from different distances corresponding to the different strengths of Said magnetic forces.

Claim 15

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by attracting thereto from an equal distance magnetic dyestuffs having different permeabilities corresponding to said color separations at said respective predetermined temperatures.

Claim 16

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected color separation of said colored image to be reproduced so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern corresponding to the distribution of the color separations of said colored image to be reproduced; and forming from said pattern a reproduction of said colored image by attracting thereto from an equal distance magnetic dyestuffs having different permeabilities corresponding to said color separations at said respective predetermined temperatures.

Claim 17

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected information so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern corresponding to the distribution of the selected informations; and forming from said pattern a colored reproduction of said informations by applying thereto magnetic dyestuffs corresponding to said informations at said respective predetermined temperatures.

Claim 18

In a method of reproducing a colored image, the steps of forming a layer including portions of different magnetizable materials in the region of a face of said layer, the permeabilities of at least a portion of each of said materials being adapted to be changed by heating said materials to at least a predetermined different temperature, respectively, each of said different magnetizable materials comprising particles consisting essentially of a core portion of hard magnetic material and a cover layer of soft magnetic material the magnetic permeability of which has a predetermined temperature dependency which is different for each of said different magnetizable materials, respectively; heating said face of said layer selectively to different ones of said predetermined different temperatures in such a manner that each of said different ones of said predetermined different temperatures corresponds to a selected information so as to change the magnetic permeabilities of the materials of those particles which are heated to at least their respective predetermined temperatures, whereby the distribution in said layer of different magnetizable materials the permeabilities of which have been changed forms a pattern corresponding to the distribution of the selected informations; and forming from said pattern a colored reproduction of said informations by applying thereto magnetic dyestuffs corresponding to said informations at said respective predetermined temperatures.

Claim 19

An inking arrangement for printing an image corresponding to a pattern of different magnetic characteristics formed in a magnetic recording layer, comprising, in combination, ink supply means for supplying magnetic ink of predetermined magnetic force, said ink supply means having a magnetic threshold value below the magnetic force of said magnetic ink; printing roller means adapted to receive ink from said ink supply means and for transferring said ink to a copy sheet, said printing roller means consisting essentially of a ferromagnetic material having a magnetic saturation value which is lower than the magnetic force of said ink by at most the threshold value of said ink supply means, and having prior to reaching the saturation value of said ink a lower total permeability than the latter; and means for adjusting the distance of said printing roller means from said copy sheet.

Claim 20

An inking arrangement for printing an image corresponding to a pattern of different magnetic characteristics formed in a magnetic recording layer, comprising, in combination, ink supply means for supplying magnetic ink of predetermined magnetic force, said ink supply means having a magnetic threshold value below the magnetic force of said magnetic ink; printing roller means adapted to receive ink from said ink supply means and for transferring said ink to a copy sheet, said printing roller means consisting essentially of a ferromagnetic material having a magnetic saturation value which is lower than the magnetic force of said ink by at most the threshold value of said ink supply means, and having prior to reaching the saturation value of said ink a lower total permeability than the latter; and means for adjusting the distance of said printing roller means from said copy sheet.

Claim 21

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a subdivided hard magnetic material and the other of said magnetic material being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 22

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a subdivided hard magnetic material and the other of said magnetic material being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 23

In a device for storing magnetic recordings wherein the difference of the temperature dependency of the permeability of at least two magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a coherent layer consisting essentially of a mixture of pulverulent hard magnetic and soft magnetic particles of different permeability within the range of operating temperatures of said recording means.

Claim 24

In a device for storing magnetic recordings wherein the difference of the temperature dependency of the permeability of at least two magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a coherent layer consisting essentially of a mixture of pulverulent hard magnetic and soft magnetic particles of different permeability within the range of operating temperatures of said recording means.

Claim 25

In a device for storing magnetic recordings wherein the difference of the temperature dependency of the permeability of at least two magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a coherent layer consisting essentially of a mixture of a mass of pulverulent hard magnetic and a mass of soft magnetic particles of different permeability within the range of operating temperatures of said recording means one of said masses of pulverulent particles exerting a magnetic shielding effect with respect to the other.

Claim 26

In a device for storing magnetic recordings wherein the difference of the temperature dependency of the permeability of at least two magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a coherent layer consisting essentially of a mixture of a mass of pulverulent hard magnetic and a mass of soft magnetic particles of different permeability within the range of operating temperatures of said recording means one of said masses of pulverulent particles exerting a magnetic shielding effect with respect to the other.

Claim 27

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a thermoplastic synthetic material having a melting point above the operating temperature of said recording means; and at least two pulverulent magnetic materials of different temperature dependency of their magnetic permeability embedded in said synthetic material.

Claim 28

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a thermoplastic synthetic material having a melting point above the operating temperature of said recording means; and at least two pulverulent magnetic materials of different temperature dependency of their magnetic permeability embedded in said synthetic material.

Claim 29

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a thermosetting synthetic material having a decomposition point above the operating temperature of said recording means; and at least two pulverulent magnetic materials of different temperature dependency of their magnetic permeability embedded in said synthetic material.

Claim 30

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a thermosetting synthetic material having a decomposition point above the operating temperature of said recording means; and at least two pulverulent magnetic materials of different temperature dependency of their magnetic permeability embedded in said synthetic material.

Claim 31

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a sintered body of at least two magnetic materials of different temperature dependency of their magnetic permeability.

Claim 32

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a sintered body of at least two magnetic materials of different temperature dependency of their magnetic permeability.

Claim 33

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of the operating temperatures of said recording means, and the other of said magnetic materials being a pulverulent, hard magnetic material, said soft magnetic material forming sintered envelopes surrounding particles of said pulverulent hard magnetic material.

Claim 34

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of the operating temperatures of said recording means, and the other of said magnetic materials being a pulverulent, hard magnetic material, said soft magnetic material forming sintered envelopes surrounding particles of said pulverulent hard magnetic material.

Claim 35

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recordIng, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of the operating temperatures of said recording means, and the other of said magnetic materials being a pulverulent, hard magnetic material, said soft magnetic material forming a coherent sintered body having particles of said pulverulent hard magnetic material embedded therein.

Claim 36

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recordIng, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a soft magnetic material the magnetic permeability of which is temperature dependent within the range of the operating temperatures of said recording means, and the other of said magnetic materials being a pulverulent, hard magnetic material, said soft magnetic material forming a coherent sintered body having particles of said pulverulent hard magnetic material embedded therein.

Claim 37

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a resilient layer of synthetic material; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means embedded in said resilient layer; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 38

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a resilient layer of synthetic material; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means embedded in said resilient layer; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 39

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a fibrous layer; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means embedded in said fibrous layer; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 40

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a fibrous layer; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means embedded in said fibrous layer; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 41

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means adhesively adhered to said support so as to form thereon a single thickness layer of said envelopes; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 42

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; sintered envelopes formed of a soft magnetic material the magnetic permeability of which is temperature dependent within the range of operating temperatures of said recording means adhesively adhered to said support so as to form thereon a single thickness layer of said envelopes; and particles of a pulverulent hard magnetic material surrounded by said sintered envelopes, respectively.

Claim 43

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being an elongated body of hard magnetic material and the other of said magnetic material being a layer of soft magnetic material sheathing said elongated body of hard magnetic material, the magnetic permeability of said soft magnetic material being temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 44

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being an elongated body of hard magnetic material and the other of said magnetic material being a layer of soft magnetic material sheathing said elongated body of hard magnetic material, the magnetic permeability of said soft magnetic material being temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 45

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a screen of hard magnetic material and the other of said magnetic material being a layer of soft magnetic material sheathing said screen of hard magnetic material, the magnetic permeability of said soft magnetic material being temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 46

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a body containing at least two magnetic materials of different temperature dependency of their magnetic permeability, one of said magnetic materials being a screen of hard magnetic material and the other of said magnetic material being a layer of soft magnetic material sheathing said screen of hard magnetic material, the magnetic permeability of said soft magnetic material being temperature dependent within the range of operating temperatures of said recording means, said hard magnetic material being embedded in said soft magnetic material.

Claim 47

In a device for storing magnetic recordings wherein the temperature dependenCy of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a substantially uniform arrangement of first magnetic bodies consisting essentially of core portions of hard magnetic material and cover layers of a soft magnetic material the magnetic permeability of which has a predetermined temperature dependency within the range of operating temperatures of said recording means, and of second magnetic bodies consisting essentially of core portions of hard magnetic material and cover layers of a soft magnetic material the magnetic permeability of which has a temperature dependency within the range of operating temperatures of said recording means which differs from said predetermined temperature dependency.

Claim 48

In a device for storing magnetic recordings wherein the temperature dependenCy of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a substantially uniform arrangement of first magnetic bodies consisting essentially of core portions of hard magnetic material and cover layers of a soft magnetic material the magnetic permeability of which has a predetermined temperature dependency within the range of operating temperatures of said recording means, and of second magnetic bodies consisting essentially of core portions of hard magnetic material and cover layers of a soft magnetic material the magnetic permeability of which has a temperature dependency within the range of operating temperatures of said recording means which differs from said predetermined temperature dependency.

Claim 49

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a substantially uniform arrangement of first magnetic bodies consisting essentially of core portions of hard magnetic material having a predetermined coercive force and cover layers of a soft magnetic material the magnetic permeability of which has a predetermined temperature dependency within the range of operating temperatures of said recording means, and of second magnetic bodies consisting essentially of core portions of hard magnetic material having a coercive force differing from said predetermined coercive force and cover layers of a soft magnetic material the magnetic permeability of which has a temperature dependency within the range of operating temperatures of said recording means which differs from said predetermined temperature dependency.

Claim 50

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a substantially uniform arrangement of first magnetic bodies consisting essentially of core portions of hard magnetic material having a predetermined coercive force and cover layers of a soft magnetic material the magnetic permeability of which has a predetermined temperature dependency within the range of operating temperatures of said recording means, and of second magnetic bodies consisting essentially of core portions of hard magnetic material having a coercive force differing from said predetermined coercive force and cover layers of a soft magnetic material the magnetic permeability of which has a temperature dependency within the range of operating temperatures of said recording means which differs from said predetermined temperature dependency.

Claim 51

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a layer of soft magnetic material having a linear temperature dependency of its magnetic permeability within the range of operating temperatures of said recording means; and, embedded in said layer, a plurality of hard magnetic particles.

Claim 52

In a device for storing magnetic recordings wherein the temperature dependency of the permeability of magnetic materials is utilized for magnetic data recording, recording means for magnetic data recording including a layer of soft magnetic material having a linear temperature dependency of its magnetic permeability within the range of operating temperatures of said recording means; and, embedded in said layer, a plurality of hard magnetic particles.

Claim 53

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two magnetic materials of different temperature dependency of their magnetic permeability.

Claim 54

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two magnetic materials of different temperature dependency of their magnetic permeability.

Claim 55

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two permanently magnetizable materials having Curie points at different temperatures within the range of operating temperatures of said recording means.

Claim 56

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two permanently magnetizable materials having Curie points at different temperatures within the range of operating temperatures of said recording means.

Claim 57

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two permanently magnetizable materials having different degrees of coercive forces and having Curie points at different temperatures within the range of operating temperatures of said recording means.

Claim 58

In a device for storing magnetic recordings wherein the temperature dependency of a magnetic characteristic of a magnetic material is utilized for magnetic data recording, recording means for magnetic data recording including a support; and a raster formed of alternating portions of at least two permanently magnetizable materials having different degrees of coercive forces and having Curie points at different temperatures within the range of operating temperatures of said recording means.