US4659588A — Method of producing optical recording medium

Claim 1

Independent Claim 103 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) forming a sintered body containing part of said TeO 2 in reduced form by heat-treating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance; and (c) evaporating and depositing tellurium compound optical recording thin film on a support by using said sintered body obtained in step (b) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 2

Independent Claim 103 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) forming a sintered body containing part of said TeO 2 in reduced form by heat-treating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance; and (c) evaporating and depositing tellurium compound optical recording thin film on a support by using said sintered body obtained in step (b) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 3

Dependent Claim 24 words

The method of claim 1, wherein a mortar is used in step (a) to mix said tellurium dioxide TeO 2 and said reducing substance.

Claim 4

Dependent Claim 20 words

The method of claim 2, wherein a ball mill is used to mix said tellurium dioxide and said reducing substance.

Claim 5

Dependent Claim 50 words

The method of claim 1, wherein an electric furnace is used for heat treating the mixture in step (b), and the mixture obtained in step (a) is dried, placed on a quartz boat, put into said electric furnace, and heated in an inert gas atmosphere to form said sintered body.

Claim 6

Dependent Claim 20 words

The method of claim 4, wherein the heating temperature is set in a range of 400° C. to 1,000° C.

Claim 7

Dependent Claim 20 words

The method of claim 5, wherein the heating temperature is set in a range of 600° C. to 700° C.

Claim 8

Dependent Claim 44 words

The method of claim 1, wherein said reducing substance is at least one selected from the group consisting of Al, Si, Ti, V, Cd, In, Sn, Sb, Ta, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Bi, Pb, S, Se, and C.

Claim 9

Dependent Claim 32 words

The method of claim 1, wherein said reducing substance is represented as M and said sintered body is an aggregated body of at least M-Te alloy, M-O oxide and TeO 2 .

Claim 10

Dependent Claim 30 words

The method of claim 1, wherein said reducing substance is at least one selected from the group consisting of Cu, Sb, Pb, Al, In, Zn, Bi, Ge, Se and Cd.

Claim 11

Dependent Claim 25 words

The method of claim 1, wherein said reducing substance is at least one selected from the group consisting of Cu, Al, Sb, Pb and ln.

Claim 12

Dependent Claim 23 words

The method of claim 1, wherein the mixing ratio α of the reducing substance is set in a range of 15 mol%≦α≦80 mol%.

Claim 13

Dependent Claim 44 words

The method of claim 1, wherein a vacuum deposition apparatus is used in step (c), and said sintered body is put in a quartz container, heated by heating means, and a tellurium compound optical recording thin film is evaporated and deposited on said support.

Claim 14

Dependent Claim 12 words

The method of claim 12, wherein the heating means includes a heater.

Claim 15

Dependent Claim 41 words

The method of claim 12, wherein an electron beam is used as the heating means, and at least one pellet is used as said vacuum deposition source, said pellet formed by pressing and compacting the powder of said pulverized sintered body.

Claim 16

Dependent Claim 27 words

The method of claim 12, wherein the degree of vacuum of the vacuum deposition apparatus is in the range of 10 -3 Torr to 10 -7 Torr.

Claim 17

Dependent Claim 21 words

The method of claim 15, wherein the degree of vacuum of the vacuum deposition apparatus is less than 10 -5 Torr.

Claim 18

Dependent Claim 27 words

The method of claim 1, wherein Cu is selected as said reducing substance and its mixing ratio α is set in a range of 15 mol%≦α≦80 mol%.

Claim 19

Dependent Claim 27 words

The method of claim 1, wherein Al is selected as the reducing substance and its mixing ratio α is set in a range of 20 mol%≦α≦60 mol%.

Claim 20

Dependent Claim 19 words

The method of claim 1, wherein Cu and Al are selected as the reducing substance and are mixed simultaneously.

Claim 21

Dependent Claim 43 words

The method of claim 19, wherein the mixing ratios α 1 , α 2 of Al and Cu are set respectfully in the range of 15 mol%≦α 1 ≦50 mol%, 20 mol%≦α 2 ≦60 mol%, and 50 mol%≦α 1 +α 2 ≦80 mol%.

Claim 22

Independent Claim 116 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) forming a sintered body containing part of said TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducting substance; (c) mixing the sintered body obtained in step (b) with an additive material; and (d) evaporating and depositing a tellurium compound optical recording thin film on a suppport by using the mixture obtained in step (c) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 23

Independent Claim 116 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) forming a sintered body containing part of said TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducting substance; (c) mixing the sintered body obtained in step (b) with an additive material; and (d) evaporating and depositing a tellurium compound optical recording thin film on a suppport by using the mixture obtained in step (c) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 24

Dependent Claim 56 words

The method of claim 21, wherein Ti, V, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pt, Cu, Ag, Zn, Cd, Al, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, S, Se, Au are used as said additive material either alone or in the form of an oxide, independently or as compounds of the substances.

Claim 25

Dependent Claim 22 words

The method of claim 21, wherein the content B of the additive material is set in a range of 10 wt.%≦B≦40 wt.%.

Claim 26

Dependent Claim 33 words

The method of claim 21, wherein the additive material is at least one element selected from the group consisting of Zn, Cd, In, Tl, Ge, Sn, Pb, As, Sb, Bi, S and Se.

Claim 27

Dependent Claim 26 words

The method of claim 21, wherein the additive material is at least one element selected from the group consisting of Ge, Sn, Bi, In and Zn.

Claim 28

Dependent Claim 21 words

The method of claim 21, wherein the content B of the additive material is set in a range of 10≦B≦30 wt.%.

Claim 29

Dependent Claim 49 words

The method of claim 21, wherein the additive material is at least one compound selected from the group consisting of Ti-Te, V-Te, Ta-Te, Cr-Te, Mo-Te, W-Te, Mn-Te, Fe-Te, Co-Te, Ni-Te, Pt-Te, Cu-Te, Ag-Te, Zn-Te, Cd-Te, Al-Te, In-Te, Tl-Te, Si-Te, Ge-Te, Sn-Te, Pb-Te, As-Te, Sb-Te, Bi-Te, S-Te, Se-Te, and Au-Te.

Claim 30

Dependent Claim 37 words

The method of claim 21, wherein the additive material is any Te compound selected from the group consisting of Ge-Te, Sn-Te, In-Te, Pb-Te, Sb-Te, Se-Te, Zn-Te, Al-Te, Bi-Te, Cu-Te, and Au-Te used either alone or in combination.

Claim 31

Dependent Claim 34 words

The method of claim 21, wherein the vacuum deposition source is at least one selected from the group consisting of Sn-Te, In-Te, Pb-Te, Sb-Te, Se-Te, Zn-Te, Al-Te, Bi-Te, Cu-Te, and Au-Te, combined with Ge.

Claim 32

Dependent Claim 22 words

The method of claim 29, wherein the content B of the additive material Ge is set in a range of 0<B≦10 wt.%.

Claim 33

Dependent Claim 52 words

The method of claim 21, wherein a vacuum deposition apparatus is used in step (d), and the mixture obtained in step (c) is put in a quartz container, heated by a heating means, and a tellurium compound optical recording film which includes said additive material is evaporated and deposited on said support.

Claim 34

Dependent Claim 30 words

The method of claim 31, wherein a coil heater is used as the heating means, and the heater temperature is set in the range of 500° C. to 1,000° C.

Claim 35

Dependent Claim 27 words

The method of claim 31, wherein the degree of vacuum of the vacuum deposition apparatus is in the range of 10 -3 Torr to 10 -7 Torr.

Claim 36

Dependent Claim 21 words

The method of claim 33, wherein the degree of vacuum of the vacuum deposition equipment is less than 10 -5 Torr.

Claim 37

Dependent Claim 35 words

The method of claim 31, wherein an electron beam is used as the heating means, and pellets compacted from the powder of the mixture obtained in step (c) are used as the vacuum deposition source.

Claim 38

Independent Claim 119 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) obtaining a sintered body containing part of the TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance; (c) obtaining a formed body by pulverizing and forming the sintered body obtained in step (b); and (d) evaporating and depositing a tellurium compound optical recording thin film on a support by using the body formed in step (c) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 39

Independent Claim 119 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 ; (b) obtaining a sintered body containing part of the TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance; (c) obtaining a formed body by pulverizing and forming the sintered body obtained in step (b); and (d) evaporating and depositing a tellurium compound optical recording thin film on a support by using the body formed in step (c) as a vacuum deposition source in cooperation with a chemically stable container.

Claim 40

Independent Claim 143 words

A method of producing an optical recording medium by mixing at least one element selected from the group consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi, Pb, S, Se,C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 . . . , M n ; x 1 +x 2 + . . . +x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, heating this sintered body in cooperation with a chemically stable container to form a tellurium compound thin film on a support as an optical recording medium.

Claim 41

Independent Claim 143 words

A method of producing an optical recording medium by mixing at least one element selected from the group consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi, Pb, S, Se,C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 . . . , M n ; x 1 +x 2 + . . . +x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, heating this sintered body in cooperation with a chemically stable container to form a tellurium compound thin film on a support as an optical recording medium.

Claim 42

Independent Claim 164 words

A method of producing an optical recording medium by mixing at least one element selected from the group of metals or semimetals consisting of Al, Si, Ti,V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi and Pb, or from the group consisting of S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 . . . , M n ; x 1 +x 2 + . . . x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing and forming this sintered body, and heating the obtained formed body in cooperation with a chemically stable container to form a tellurium compound thin film on a support for use as an optical recording medium.

Claim 43

Independent Claim 164 words

A method of producing an optical recording medium by mixing at least one element selected from the group of metals or semimetals consisting of Al, Si, Ti,V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi and Pb, or from the group consisting of S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 . . . , M n ; x 1 +x 2 + . . . x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing and forming this sintered body, and heating the obtained formed body in cooperation with a chemically stable container to form a tellurium compound thin film on a support for use as an optical recording medium.

Claim 44

Independent Claim 168 words

A method of producing an optical recording medium by mixing at least one element selected from the group of metals or semimetals consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi and Pb, or from the group consisting of S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 , . . . M n ; x 1 +x 2 + . . . x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing and forming this sintered body and heating by electron beam the obtained formed body in cooperation with a chemically stable container to form a tellurium compound thin film on a support for use as an optical recording medium.

Claim 45

Independent Claim 168 words

A method of producing an optical recording medium by mixing at least one element selected from the group of metals or semimetals consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi and Pb, or from the group consisting of S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an aggregated body of reducing substances M 1 , M 2 , . . . M n ; x 1 +x 2 + . . . x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing and forming this sintered body and heating by electron beam the obtained formed body in cooperation with a chemically stable container to form a tellurium compound thin film on a support for use as an optical recording medium.

Claim 46

Independent Claim 180 words

A method of producing an optical recording medium by mixing at least one element selected from the group consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi, Pb, S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an amassed body of reducing substances M 1 , M 2 , . . . , M n ; x 1 +x 2 . . . +x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing said sintered body to obtain powdered sintered body, combining this powdered sintered body with additive materials to form a mixture, and heating said mixture in cooperation with a chemically stable container in a vacuum so as to use said mixture as a vacuum deposition source to form a tellurium compound optical recording thin film containing the additive materials on a support.

Claim 47

Independent Claim 180 words

A method of producing an optical recording medium by mixing at least one element selected from the group consisting of Al, Si, Ti, V, W, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ge, Mo, Cd, In, Sn, Sb, Ta, Bi, Pb, S, Se, C with tellurium dioxide for use as a reducing substance on said tellurium dioxide, heating in a form of TeO 2 100-x.sbsb.α M x .sbsb.α, where 0<x.sub.α <80 mol% and M is an amassed body of reducing substances M 1 , M 2 , . . . , M n ; x 1 +x 2 . . . +x n =x.sub.α, to obtain a sintered body containing part of said tellurium dioxide in reduced form, pulverizing said sintered body to obtain powdered sintered body, combining this powdered sintered body with additive materials to form a mixture, and heating said mixture in cooperation with a chemically stable container in a vacuum so as to use said mixture as a vacuum deposition source to form a tellurium compound optical recording thin film containing the additive materials on a support.

Claim 48

Independent Claim 120 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 , said reducing substance represented as M; (b) forming a sintered body containing part of said TeO 2 in reduced form by treating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance whereby said sintered body is an aggregated body of at least M-Te alloy, M-O oxide and TeO 2 ; and (c) depositing an optical recording thin film on a support by heating the sintered body obtained in step (b) in cooperation with a chemically stable container.

Claim 49

Independent Claim 120 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 , said reducing substance represented as M; (b) forming a sintered body containing part of said TeO 2 in reduced form by treating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance whereby said sintered body is an aggregated body of at least M-Te alloy, M-O oxide and TeO 2 ; and (c) depositing an optical recording thin film on a support by heating the sintered body obtained in step (b) in cooperation with a chemically stable container.

Claim 50

Independent Claim 135 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 , said reducing substance represented as M; (b) forming a sintered body containing part of said TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance whereby said sintered body is an aggregated body of at least M-Te alloy M-O oxide and TeO 2 ; (c) mixing the sintered body obtained in step (b) with an additive material; (d) depositing an optical recording thin film including said additive material on a support by heating the mixture obtained in step (c) in cooperation with a chemically stable container.

Claim 51

Independent Claim 135 words

A method of producing an optical recording medium comprising the steps of: (a) mixing tellurium dioxide TeO 2 and a reducing substance capable of reducing said TeO 2 , said reducing substance represented as M; (b) forming a sintered body containing part of said TeO 2 in reduced form by heating the mixture obtained in step (a) to cause said part of TeO 2 to react with and be reduced by said reducing substance whereby said sintered body is an aggregated body of at least M-Te alloy M-O oxide and TeO 2 ; (c) mixing the sintered body obtained in step (b) with an additive material; (d) depositing an optical recording thin film including said additive material on a support by heating the mixture obtained in step (c) in cooperation with a chemically stable container.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1990-04-20	1990-10-20	1991-04-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1994-04-20	1994-10-20	1995-04-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1998-04-20	1998-10-20	1999-04-21	$7700.00	Window Closed / Lapsed

Method of producing optical recording medium

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag