US3818148A
Expired / Lapsed
US
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Radiation transducer system with collimated beam readout of lens modulation elements
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1972-09-29
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Granted: 1974-06-18
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Expires: 1992-09-29
Abstract
Abstract A method and apparatus for reproducing signals stored on a carrier in the form of undulations corresponding to the signals, the undulations generally being formed as a spiral groove. The undulations on the carrier are moved past a suitable radiation source, such as a light source, and the density of the radiation emanating from the undulations, which is a function of the curvature of the undulation, is detected by a suitable radiation detecting means after it passes through a suitable slit aperture arranged at a predetermined distance from the carrier surface, so that variations in the density are a function of the undulations. The undulations may be either frequency or phase modulated with respect to the signal and their amplitude can be modified as a function of their recorded wavelength in such a manner that the curved surface portions of the undulations have nearly the same focal length for all occurring wavelengths. The carrier can have at least one recording surface in which is formed a groove having a trapezoidal cross section and having its bottom surface provided with the undulations.
Inventors
- 👤 G Dickopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/004; G11B7/007; G11B7/08; G11B7/085; G11B7/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
279 words
An apparatus for reproducing signals stored on a recording carrier in a recording track in the form of surface undulations corresponding to the time sequence of the signals, the surface undulations having the form of cylindrical density modulating surfaces with axes disposed transversely to the recording track, comprising, in combination: a. radiation means which emits radiation in the form of an approximately collimated beam toward a portion of the surface undulations to cause the collimated beam to impinge upon the undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. means for driving the recording carrier relative to the radiation source in the direction of the track; c. a radiation receiver disposEd for receiving the radiation emanating from the surface undulations; d. a slit aperture means disposed in the beam path between the region to be occupied by the surface undulations and the radiation receiver; and e. optical means disposed in the beam path between the surface undulations and said slit aperture means for reproducing the plane which is a given distance from the carrier surface at the slit aperture plane said slit aperture means having an aperture which has a length transverse to the cylinder axes and in the direction of the relative movement of the recording carrier with respect to the radiation receiver, said length being less than the product of the shortest wavelength of the surface undulations and the enlargement factor of the optical means.
Claim 2
Independent Claim
279 words
An apparatus for reproducing signals stored on a recording carrier in a recording track in the form of surface undulations corresponding to the time sequence of the signals, the surface undulations having the form of cylindrical density modulating surfaces with axes disposed transversely to the recording track, comprising, in combination: a. radiation means which emits radiation in the form of an approximately collimated beam toward a portion of the surface undulations to cause the collimated beam to impinge upon the undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. means for driving the recording carrier relative to the radiation source in the direction of the track; c. a radiation receiver disposEd for receiving the radiation emanating from the surface undulations; d. a slit aperture means disposed in the beam path between the region to be occupied by the surface undulations and the radiation receiver; and e. optical means disposed in the beam path between the surface undulations and said slit aperture means for reproducing the plane which is a given distance from the carrier surface at the slit aperture plane said slit aperture means having an aperture which has a length transverse to the cylinder axes and in the direction of the relative movement of the recording carrier with respect to the radiation receiver, said length being less than the product of the shortest wavelength of the surface undulations and the enlargement factor of the optical means.
Claim 3
Independent Claim
253 words
A method for reproducing a signal stored on a carrier having a surface with a series of undulations arranged along a recording track and corresponding to a function of the time behavior of said signal, the undulations constituting cylindrical radiation density modulating surfaces whose cylinder axes lie substantially perpendicular to the direction of the recording track, comprising the steps of: a. causing a substantially collimated beam of radiation to impinge upon said undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. arranging a slit aperture means in such plane, said aperture means having a length, transverse to the cylinder axes and in the direction of the relative movement of the carrier with respect to said radiation, which is less than the shortest wavelength of the surface undulations; c. moving the carrier relative to said radiation in the direction of said track; and d. detecting the density of the radiation emanating from the undulations through said slit aperture means, the density of the radiation emanating from the undulations changing in dependence on the curvature of the deformed surfaces of the undulations in the direction of the relative speed of the carrier with respect to the impinging radiation so that the change in density reproduces the path of the undulations at least qualitatively.
Claim 4
Independent Claim
253 words
A method for reproducing a signal stored on a carrier having a surface with a series of undulations arranged along a recording track and corresponding to a function of the time behavior of said signal, the undulations constituting cylindrical radiation density modulating surfaces whose cylinder axes lie substantially perpendicular to the direction of the recording track, comprising the steps of: a. causing a substantially collimated beam of radiation to impinge upon said undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. arranging a slit aperture means in such plane, said aperture means having a length, transverse to the cylinder axes and in the direction of the relative movement of the carrier with respect to said radiation, which is less than the shortest wavelength of the surface undulations; c. moving the carrier relative to said radiation in the direction of said track; and d. detecting the density of the radiation emanating from the undulations through said slit aperture means, the density of the radiation emanating from the undulations changing in dependence on the curvature of the deformed surfaces of the undulations in the direction of the relative speed of the carrier with respect to the impinging radiation so that the change in density reproduces the path of the undulations at least qualitatively.
Claim 5
Dependent Claim
18 words
A method as defined in claim 2, wherein the undulations are formed to approximate a frequency modulated oscillation.
Claim 6
Dependent Claim
18 words
A method as defined in claim 2, wherein the undulations are formed to approximate a phase modulated oscillation.
Claim 7
Independent Claim
256 words
A method for reproducing a signal stored on a carrier having a surface with a series of undulations arranged along a recording track and corresponding to a function of the time behavior of said signal, the undulations constituting cylindrical radiation density modulating surfaces whose cylinder axes lie substantially perpendicular to the direction of the recording track, comprising the steps of: a. causing a substantially collimated beam of radiation to impinge upon said undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. optically reproducing such plane at a reproduction plane by optical means having a given enlargement factor; c. arranging a slit aperture means in the reproduction plane, said aperture means having a length, transverse to the cylinder axes and in the direction of the relative movement of the carrier with respect to said radiation; d. moving the carrier relative to said radiation applying device; and e. detecting the density of the radiation emanating from the undulations through said slit aperture means, the density of the radiation emanating from the undulations changing in dependence on the curvature of the deformed Surfaces of the undulations in the direction of the relative speed of the carrier with respect to the impinging radiation so that the change in density reproduces the path of the undulations at least qualitatively.
Claim 8
Independent Claim
256 words
A method for reproducing a signal stored on a carrier having a surface with a series of undulations arranged along a recording track and corresponding to a function of the time behavior of said signal, the undulations constituting cylindrical radiation density modulating surfaces whose cylinder axes lie substantially perpendicular to the direction of the recording track, comprising the steps of: a. causing a substantially collimated beam of radiation to impinge upon said undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. optically reproducing such plane at a reproduction plane by optical means having a given enlargement factor; c. arranging a slit aperture means in the reproduction plane, said aperture means having a length, transverse to the cylinder axes and in the direction of the relative movement of the carrier with respect to said radiation; d. moving the carrier relative to said radiation applying device; and e. detecting the density of the radiation emanating from the undulations through said slit aperture means, the density of the radiation emanating from the undulations changing in dependence on the curvature of the deformed Surfaces of the undulations in the direction of the relative speed of the carrier with respect to the impinging radiation so that the change in density reproduces the path of the undulations at least qualitatively.
Claim 9
Dependent Claim
18 words
A method as defined in claim 5, wherein the undulations are formed to approximate a frequency modulated oscillation.
Claim 10
Dependent Claim
18 words
A method as defined in claim 5, wherein the undulations are formed to approximate a phase modulated oscillation.
Claim 11
Independent Claim
231 words
An apparatus for reproducing signals stored on a recording carrier in a recording track in the form of surface undulations corresponding to the time sequence of the signals, the surface undulations having the form of cylindrical density modulating surfaces with axes disposed transversely to the recording track, comprising, in combination: a. radiation means which emits radiation in the form of an approximately collimated beam toward a portion of the surface undulations to cause the collimated beam to impinge upon the undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. means for driving the recording carrier relative to the radiation source in the direction of the track; c. a radiation receiver disposed for receiving the radiation emanating from the surface undulations; and d. a slit aperture means disposed in such plane between the region to be occupied by the surface undulations and the radiation receiver, said aperture means having an aperture which has a length transverse to the cylinder axes and in the direction of the relative movement of the recording carrier with respect to the radiation receiver, said length being less than the shortest wavelength of the surface undulations.
Claim 12
Independent Claim
231 words
An apparatus for reproducing signals stored on a recording carrier in a recording track in the form of surface undulations corresponding to the time sequence of the signals, the surface undulations having the form of cylindrical density modulating surfaces with axes disposed transversely to the recording track, comprising, in combination: a. radiation means which emits radiation in the form of an approximately collimated beam toward a portion of the surface undulations to cause the collimated beam to impinge upon the undulations so as to be modulated by the surfaces thereof in a manner to cause, at a plane parallel to and spaced a given distance from the carrier surface, the density of the radiation emanating from the undulations to be a function of the curvature of the density modulating surfaces; b. means for driving the recording carrier relative to the radiation source in the direction of the track; c. a radiation receiver disposed for receiving the radiation emanating from the surface undulations; and d. a slit aperture means disposed in such plane between the region to be occupied by the surface undulations and the radiation receiver, said aperture means having an aperture which has a length transverse to the cylinder axes and in the direction of the relative movement of the recording carrier with respect to the radiation receiver, said length being less than the shortest wavelength of the surface undulations.
Claim 13
Dependent Claim
49 words
The apparatus as defined in claim 8, wherein the distance of said slit aperture means from a plane representing the average mid-point of the undulations is selected to be somewhat greater than the distance between the plane where radiation emanating from the undulations is focused and the average mid-point.
Claim 14
Dependent Claim
39 words
The apparatus as defined in claim 9, wherein the carrier has an axis of rotation, and wherein the radiation is directed parallel to the axis of rotation of the carrier and perpendicular to its surface area containing the undulations.
Claim 15
Dependent Claim
127 words
The apparatus as defined in claim 10 wherein the undulations have continuously curved surfaces which substantially define sine curve along the direction of relative speed between the carrier and the radiation from said radiation means and wherein the amplitude of the undulations changes in dependence on the wavelength of the modulated carrier oscillation as an approximate function of the following relation: A yB/2 - Square Root yB2/4 - 1/(n-1)k2 wherein A is the amplitude, k the number of waves 2 pi / lambda ( lambda wavelength), yB is the distance between the focal plane of the radiation emanating from the undulation and the plane of the center surface of the carrier, and n is the index of refraction of the material used to fabricate the recording element.
Claim 16
Dependent Claim
68 words
The apparatus as defined in claim 11, wherein said undulations are configured as quasi-cylindrical lenses, and wherein said radiation means is arranged so as to pass said approximately collimated beam through a transparent carrier mounted for rotation with respect to the light rays so that the rays emanating from the carrier are converged to the plane where the rays are focused by the refractive power of said undulations.
Claim 17
Dependent Claim
68 words
The apparatus as defined in claim 11, wherein said undulations are configured as quasi-cylindrical mirrors, and wherein said radiation means is arranged to reflect said approximately collimated beam off of a relative coating in the area of the carrier bEaring the undulations so that the light rays reflecting from the undulations are converged in a plane arranged on the same side of the carrier as the light source.
References Cited (Backward Citations)
US1951198A
Cited
US1917003A
Cited
US1944202A
Cited
US2092892A
Cited
US2497142A
Cited
US2654810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |