US3936140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for sequential data storage
Assignee: Siemens AG
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Filing: 1974-07-31
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Granted: 1976-02-03
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Expires: 1994-07-31
Abstract
Abstract An apparatus for sequential data storage employing a coherent light source from which an object wave and a reference wave source symmetrical to one another are created, each wave being directed through a spherical lens and then a plane-parallel, transparent plate to a moving storage medium for recording. Each of the plane-parallel transparent plates may be fixed selectively either normal to the path of its respective wave or obliquely to the path.
Inventors
- 👤 Hartwig Ruell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1365; G11B7/004; G11B7/0045; G11B7/0065; G11C; G11C13/00; G11C13/04; G11C13/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
In an apparatus for sequential data storage having a coherent light source from which a source symmetrical object wave and reference wave each are directed through one of two spherical lenses and through one of two corresponding plane-parallel, transparent plates onto a storage medium moving along a path, the improvement comprising: a beam divider in the path of the reference wave between said spherical lens and said source; each plane-parallel plate being selectively positionable in a first position normal to its respective wave for non-holographic recording and readout of data and in a second position which is inclined in relation to the wave for holographic recording and read-out of data; and each plane-parallel plate being swivelable between its said first and second positions about an axis normal to its respective wave and substantially through a center portion of said wave.
Claim 2
Dependent Claim
140 words
In an apparatus for sequential data storage having a coherent light source from which a source symmetrical object wave and reference wave each are directed through one of two spherical lenses and through one of two corresponding plane-parallel, transparent plates onto a storage medium moving along a path, the improvement comprising: a beam divider in the path of the reference wave between said spherical lens and said source; each plane-parallel plate being selectively positionable in a first position normal to its respective wave for non-holographic recording and readout of data and in a second position which is inclined in relation to the wave for holographic recording and read-out of data; and each plane-parallel plate being swivelable between its said first and second positions about an axis normal to its respective wave and substantially through a center portion of said wave.
Claim 3
Dependent Claim
43 words
An apparatus for sequential data storage as defined in claim 1, further defined by the axis for inclination of the plane-parallel, transparent plate in the object wave being normal to the axis for inclination of the plane-parallel, transparent plate in the reference wave.
Claim 4
Dependent Claim
59 words
An apparatus for sequential data storage as defined in claim 1, further defined by the axis for inclination of the plane-parallel, transparent plate in the object wave being in a plane normal to the path of the moving storage medium and the axis for inclination of the plane-parallel, transparent plate in the reference wave being coplanar with said path.
References Cited (Backward Citations)
US3776995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |