US4577932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-spot modulator using a laser diode
Assignee: Creo Inc
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Filing: 1984-05-08
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Granted: 1986-03-25
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Expires: 2004-05-08
Abstract
Abstract A multi-spot light modulator using a laser diode is disclosed in which a single light pulse from the laser diode generates a multi-spot image of a data pattern, each spot corresponding to an active bit of the data pattern. The ability of a pulsed laser diode to generate a narrow light pulse is used to image an acoustic wave corresponding to the data pattern without the normal degradation in resolution caused by the motion of the acoustic wave.
Inventors
- 👤 Daniel Gelbart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A multi-spot light modulator comprising: a laser operating in the pulsed mode; an acousto-optic modulator and means for converting a data pattern into a corresponding acoustic wave inside said modulator, said modulator for diffracting a beam from said laser; a lens for focussing a light pulse from said laser onto said acoustic wave; a light sensitive material for generating a permanent record; a second lens located in said diffracted output beam of said modulator for forming an image of said acoustic wave onto said light sensitive material; and means for synchronizing said light pulse with said data pattern in order to generate a permanent record of said data pattern on said light sensitive material.
Claim 2
Dependent Claim
114 words
A multi-spot light modulator comprising: a laser operating in the pulsed mode; an acousto-optic modulator and means for converting a data pattern into a corresponding acoustic wave inside said modulator, said modulator for diffracting a beam from said laser; a lens for focussing a light pulse from said laser onto said acoustic wave; a light sensitive material for generating a permanent record; a second lens located in said diffracted output beam of said modulator for forming an image of said acoustic wave onto said light sensitive material; and means for synchronizing said light pulse with said data pattern in order to generate a permanent record of said data pattern on said light sensitive material.
Claim 3
Dependent Claim
61 words
A multi-spot light modulator as described in claim 1 further comprising a crystal of non-linear optical material positioned in the path of the laser pulse in order to double the frequency of the laser light; and, a focussing lens for concentrating light output of said laser into said non linear material in order to increase the efficiency of the frequency doubling.
Claim 4
Dependent Claim
17 words
A multi-spot modulator as described in claims 1 or 2 wherein said laser is a laser diode.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |