US3715733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error compensating optical detector apparatus and method
Assignee: AT&T Inc
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Filing: 1972-02-11
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Granted: 1973-02-06
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Expires: 1992-02-11
Abstract
Abstract An optical memory system comprises a laser light beam that illuminates a hologram, which contains stored bit and position information, in order to produce a position light beam and signal light beams, which are imaged respectively on an array of position detectors and an array of information detectors. Any misregistration of the laser light beam causes the position detectors to generate an error signal which is used to correct the outputs of the information detectors.
Inventors
- 👤 A Feiner
- 👤 P Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:54
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
227 words
An optical memory system comprising: a light activated memory storage apparatus which contains stored signal and position information; a light source; the light source being adapted to image a light beam on the memory apparatus such that signal and position light information is emitted by the memory apparatus; optical detector apparatus which is adapted to detect signal light information comprising: an array of information detectors that are adapted to detect signal light information incident thereon; signal light information emitting from the memory apparatus being imaged on the information detectors; an array of position detectors that are adapted to detect position light information incident thereon; position light information emitting from the memory apparatus being imaged on the position detectors; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light information incident upon the information detectors from position light information incident upon at least one of the position deteCtors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 2
Dependent Claim
227 words
An optical memory system comprising: a light activated memory storage apparatus which contains stored signal and position information; a light source; the light source being adapted to image a light beam on the memory apparatus such that signal and position light information is emitted by the memory apparatus; optical detector apparatus which is adapted to detect signal light information comprising: an array of information detectors that are adapted to detect signal light information incident thereon; signal light information emitting from the memory apparatus being imaged on the information detectors; an array of position detectors that are adapted to detect position light information incident thereon; position light information emitting from the memory apparatus being imaged on the position detectors; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light information incident upon the information detectors from position light information incident upon at least one of the position deteCtors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 3
Dependent Claim
227 words
An optical memory system comprising: a light activated memory storage apparatus which contains stored signal and position information; a light source; the light source being adapted to image a light beam on the memory apparatus such that signal and position light information is emitted by the memory apparatus; optical detector apparatus which is adapted to detect signal light information comprising: an array of information detectors that are adapted to detect signal light information incident thereon; signal light information emitting from the memory apparatus being imaged on the information detectors; an array of position detectors that are adapted to detect position light information incident thereon; position light information emitting from the memory apparatus being imaged on the position detectors; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light information incident upon the information detectors from position light information incident upon at least one of the position deteCtors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 4
Dependent Claim
227 words
An optical memory system comprising: a light activated memory storage apparatus which contains stored signal and position information; a light source; the light source being adapted to image a light beam on the memory apparatus such that signal and position light information is emitted by the memory apparatus; optical detector apparatus which is adapted to detect signal light information comprising: an array of information detectors that are adapted to detect signal light information incident thereon; signal light information emitting from the memory apparatus being imaged on the information detectors; an array of position detectors that are adapted to detect position light information incident thereon; position light information emitting from the memory apparatus being imaged on the position detectors; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light information incident upon the information detectors from position light information incident upon at least one of the position deteCtors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 5
Dependent Claim
20 words
The apparatus of claim 1 wherein the light source is a laser and the memory storage apparatus is a hologram.
Claim 6
Dependent Claim
197 words
In a method for storing and retrieving information comprising the steps of recording digital information on a hologram; retrieving the stored information by applying a light beam to the hologram, imaging the resulting optical output from the hologram onto a matrix array of information photodetectors that create an output electrical signal indicative of the stored information, the improvement comprising the steps of: recording position information in the hologram, whereby position light information is emitted from the hologram in response to the reconstructing light beam concurrently with the emission of signal light information; and imaging the position light information onto an array of position photodetectors that are coupled to a position logic circuit, which generates a predetermined signal in response to the position light information images incident upon the position detectors, but, if there is some misregistration in the signal light information images upon the information photodetectors, which generates an error signal indicative of the misregistration; utilizing the error signal to modify the position of the electrical output signal from the information detectors to compensate for misregistration of the light signal information images on the information photodetectors caused by position errors in the light beam source or hologram.
Claim 7
Dependent Claim
197 words
In a method for storing and retrieving information comprising the steps of recording digital information on a hologram; retrieving the stored information by applying a light beam to the hologram, imaging the resulting optical output from the hologram onto a matrix array of information photodetectors that create an output electrical signal indicative of the stored information, the improvement comprising the steps of: recording position information in the hologram, whereby position light information is emitted from the hologram in response to the reconstructing light beam concurrently with the emission of signal light information; and imaging the position light information onto an array of position photodetectors that are coupled to a position logic circuit, which generates a predetermined signal in response to the position light information images incident upon the position detectors, but, if there is some misregistration in the signal light information images upon the information photodetectors, which generates an error signal indicative of the misregistration; utilizing the error signal to modify the position of the electrical output signal from the information detectors to compensate for misregistration of the light signal information images on the information photodetectors caused by position errors in the light beam source or hologram.
Claim 8
Dependent Claim
157 words
Optical detector apparatus for accurately detecting signal light information comprising: an array of information detectors that are adapted to detect the information from signal light beams incident thereon; an array of position detectors that are adapted to detect the information from a position light beam incident thereon; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light beams incident upon the information detectors, from a position light beam incident upon at least one of the position detectors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 9
Dependent Claim
157 words
Optical detector apparatus for accurately detecting signal light information comprising: an array of information detectors that are adapted to detect the information from signal light beams incident thereon; an array of position detectors that are adapted to detect the information from a position light beam incident thereon; the position detectors being coupled to a position logic circuit that is adapted to create a registration error signal corresponding to any registration errors in the signal light beams incident upon the information detectors, from a position light beam incident upon at least one of the position detectors; the position circuit being coupled to first circuit means for activating selected information detectors in accordance with the registration error signal; and the position logic circuit being coupled to second circuit means for processing information from the selected information detectors with the information from the registration error signal to correctly assemble the signal light information as if it contained no position errors.
Claim 10
Dependent Claim
46 words
The apparatus of claim 4 wherein the size and relative position of the position detectors are such that the position light beam is incident upon one, two, or four position detectors depending on the registration error in the signal light beams incident upon the information detectors.
Claim 11
Dependent Claim
20 words
The apparatus of claim 5 wherein the information detector array is arranged in rows and columns of interconnected information detectors.
Claim 12
Dependent Claim
25 words
The apparatus of claim 6 wherein the digital information capacity of the detector apparatus is MXN bits and there are 4 (MXN) individual information detectors.
Claim 13
Dependent Claim
36 words
The apparatus of claim 7 further comprising: an address register having M output primary word lines, which are coupled to the first circuit means; and wherein the second circuit means contains N output primary digit lines.
Claim 14
Dependent Claim
41 words
The apparatus of claim 8 further comprising: secondary word lines coupled to the rows of interconnected information detectors and to the First circuit means; and secondary digit lines coupling the columns of interconnected information detectors and to the second circuit means.
Claim 15
Dependent Claim
20 words
The apparatus of claim 9 wherein the information detectors are dual emitter junction transistors which have light sensitive base areas.
Claim 16
Dependent Claim
38 words
The apparatus of claim 10 wherein the size of the light sensitive base areas and the relative positions of the junction transistors are such that a single light beam is incident upon a quadrant of four information detectors.
Claim 17
Dependent Claim
26 words
The apparatus of claim 11 wherein at least two adjacent secondary word lines are activated by the first circuit means to detect a signal light beam.
Claim 18
Dependent Claim
22 words
The apparatus of claim 12 wherein there are six adjacent secondary word lines corresponding to each of the M primary word lines.
Claim 19
Dependent Claim
38 words
The apparatus of claim 13 wherein signal light information corresponding to a selected primary word line is incident on any two adjacent secondary word lines of the six secondary word lines corresponding to the selected primary word line.
Claim 20
Dependent Claim
27 words
The apparatus of claim 14 wherein there are six secondary digit lines corresponding to each of the N output primary digit lines of the second circuit means.
Claim 21
Dependent Claim
49 words
The apparatus of claim 15 wherein signal light information corresponding to any bit of a selected primary word line is incident upon any two adjacent secondary digit lines of the six secondary digit lines corresponding to the N output primary digit lines on which the selected bit is registered.
Claim 22
Dependent Claim
24 words
The apparatus of claim 16 wherein there are nine position logic detectors which are arranged in a matrix of three rows and three columns.
Claim 23
Dependent Claim
21 words
The apparatus of claim 17 wherein the second circuit means comprises five 3-input AND gates and a one 5-input OR gate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |