US3566137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic character reader
Assignee: General Electric Co
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Filing: 1967-11-28
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Granted: 1971-02-23
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Expires: 1987-11-28
Abstract
Abstract Apparatus for recognizing serially viewed characters of a known font of type is achieved by imaging the characters onto a substrate bearing an electrically charged liquid photoconductor medium deformable in accordance with the optical image. When the deformed portion of the medium is rotated into the beam of a pulsed laser, spots are imaged upon a matrix of photodetectors by passing the laser beam emergent from the medium through a multiple spatial filter made by positioning the type for each of the expected characters in a vertical line.
Inventors
- 👤 Charles Q Lemmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:03
CPC Classifications
G; G03; G03H; G03H1/00; B; B07; B07C; B07C3/00; B07C3/10; B07C3/14; G06; G06V; G06V10/00; G06V10/88
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
In a graphic character recognition system having essentially real-time recognition capability and including a source of coherent radiation pulses, radiation detecting means positioned in the path of said radiation, spatial filter means interposed between said source of coherent radiation and said radiation detecting means, and media bearing sets of characters to be recognized, the improvement comprising: a substrate coated with a deformable liquid photoconductor and situated intermediate said source and said filter means; means for momentarily illuminating each of said media in sequence; optical means for imaging the set of characters on each medium when illuminated onto a region of the liquid photoconductor coating so as to deform said region accordingly; and means for situating the deformed region of said coating in the path of said radiation.
Claim 2
Dependent Claim
127 words
In a graphic character recognition system having essentially real-time recognition capability and including a source of coherent radiation pulses, radiation detecting means positioned in the path of said radiation, spatial filter means interposed between said source of coherent radiation and said radiation detecting means, and media bearing sets of characters to be recognized, the improvement comprising: a substrate coated with a deformable liquid photoconductor and situated intermediate said source and said filter means; means for momentarily illuminating each of said media in sequence; optical means for imaging the set of characters on each medium when illuminated onto a region of the liquid photoconductor coating so as to deform said region accordingly; and means for situating the deformed region of said coating in the path of said radiation.
Claim 3
Dependent Claim
31 words
The character recognition system of claim 1 wherein said means for illuminating sequentially each of said media comprises a flashlamp and means for moving said media in relation to said flashlamp.
Claim 4
Dependent Claim
26 words
The character recognition system of claim 1 including means synchronizing said source of coherent radiation pulses with said means for illuminating sequentially each of said media.
Claim 5
Dependent Claim
38 words
The character recognition system of claim 2 including means synchronizing said source of coherent radiation pulses and said means for illuminating sequentially each of said media with the rate at which each one of said media is detected.
Claim 6
Dependent Claim
49 words
The character recognition system of claim 1 wherein said means for situating the deformed region of said coating in the path of said radiation comprises means mechanically coupled to said substrate for impelling said substrate to transport the deformed region of said coating into the path of said radiation.
Claim 7
Dependent Claim
24 words
The character recognition system of claim 5 wherein said substrate comprises a disc and said means for impelling said substrate comprises a synchronous motor.
Claim 8
Dependent Claim
40 words
The character recognition system of claim 5 including means for establishing an electrical charge on the surface of said coating in the region of said coating immediately ahead of the location at which said characters are imaged onto said coating.
Claim 9
Dependent Claim
27 words
The character recognition system of claim 5 wherein said source of coherent radiation pulses comprises a laser and said radiation detecting means comprises an array of photodetectors.
Claim 10
Dependent Claim
34 words
The character recognition system of claim 6 including means for establishing an electrical charge on the surface of said coating immediately ahead of the location at which said characters are imaged onto said coating.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |