Patent US3576545A successfully refreshed from Google Patents.
US3576545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Memory for recording a function of four independent variables
Assignee: Thales SA
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Filing: 1967-05-11
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Granted: 1971-04-27
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Expires: 1987-05-11
Abstract
Abstract A storage system capable of recording on a photographic material information items corresponding to the values of a function of four independent variables and capable of retrieving the stored values of said function for any predetermined combination of said variables. To this end the position of sources of light is controlled as a function of said variables and these positions are impressed on photographic plates.
Inventors
- 👤 Jean-Louis Meilleroux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:28
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/048
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
An optical storage system for recording and retrieving sampled values of a single valued function F of four independent variables a, b, a'', b'', said system comprising: analog-to-digital converter means having an input for receiving said values and a plurality of outputs; a plurality of point sources of light, respectively controlled by said outputs; first means for changing the location of said sources as a function of variables a'' and b''; photographic means located in a position for storing said locations and the information in said locations; second means for controlling the position of said photographic means as a function of variables a and b; photoelectric means having a plurality of outputs positioned for reading-out said information stored in said photographic means; and digital-to-analog converter means coupled to said photoelectric means outputs for retrieving the stored values of said function F.
Claim 2
Dependent Claim
141 words
An optical storage system for recording and retrieving sampled values of a single valued function F of four independent variables a, b, a'', b'', said system comprising: analog-to-digital converter means having an input for receiving said values and a plurality of outputs; a plurality of point sources of light, respectively controlled by said outputs; first means for changing the location of said sources as a function of variables a'' and b''; photographic means located in a position for storing said locations and the information in said locations; second means for controlling the position of said photographic means as a function of variables a and b; photoelectric means having a plurality of outputs positioned for reading-out said information stored in said photographic means; and digital-to-analog converter means coupled to said photoelectric means outputs for retrieving the stored values of said function F.
Claim 3
Dependent Claim
36 words
A system as claimed in claim 1, wherein said point sources are positioned in a first plane; said photographic means being positioned in a second plane, and said photoelectric means being positioned in a third plane.
Claim 4
Dependent Claim
30 words
A system as claimed in claim 2, wherein first and second stigmatic optical devices are respectively interposed between said first and second plane and between said second and third plane.
Claim 5
Dependent Claim
73 words
A system as claimed in claim 1, wherein said first location changing means comprise: two further analog-to-digital converters having respective inputs for receiving variables a'' and b'' and a plurality of outputs; AND-gate means coupled to said outputs of said analog-to-digital converters and matrix means having rows and columns for feeding said sources; said rows and columns of said matrix means being controlled by said gate means for building up said light locations.
Claim 6
Dependent Claim
19 words
A system as claimed in claim 1, wherein said light sources are incandescent lamps arranged for providing light dots.
Claim 7
Dependent Claim
39 words
A system as claimed in claim 1, wherein at least one of said variables has a predetermined value; the remaining variables controlling the storage and the retrieval of the sampled values of a function of the remaining variables only.
Claim 8
Dependent Claim
37 words
A system as claimed in claim 3, wherein said first stigmatic device comprise a pair of convergent lenses having a common focus; said second stigmatic device being a convergent lens whose focus coincides with said third plane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |