US4100408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal generator for raster type scanners
Assignee: Xerox Corp
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Filing: 1977-03-02
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Granted: 1978-07-11
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Expires: 1997-03-02
Abstract
Abstract A signal generating apparatus driven by the reference beam of an image scanning system is disclosed. The apparatus includes an apertured codeplate across which the reference beam sweeps, light from the beam triggering a photodetector to produce a signal pulse output. A grating is inserted into the beam path to split the reference beam into a plurality of spaced apart beams effective to offset blockage or irregularity of one or more of the codeplate apertures.
Inventors
- 👤 Sidney W. Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:57
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/053; H04N1/113; H04N1/1135; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04713; H04N2201/04734; H04N2201/04744; H04N2201/04746
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
143 words
In a signal generating apparatus for generating signal pulses in accordance with the sweep of a light beam, the apparatus including aperture means having a succession of spaced apart apertures, the aperture means being astride the path through which the light beam sweeps whereby to produce a succession of light bursts on sweep of the light beam thereacross, and light triggered signal generating means for producing signal pulses in response to the light bursts, the improvement comprising: beam splitting means for separating said light beam into plural secondary light beams, the spacing between said secondary beams being at least equal to the distance between adjoining ones of the apertures in said aperture means, said plural secondary light beams assuring distortion free production of the signal pulses in the event one or more of the apertures in said aperture means are closed or misaligned.
Claim 2
Dependent Claim
143 words
In a signal generating apparatus for generating signal pulses in accordance with the sweep of a light beam, the apparatus including aperture means having a succession of spaced apart apertures, the aperture means being astride the path through which the light beam sweeps whereby to produce a succession of light bursts on sweep of the light beam thereacross, and light triggered signal generating means for producing signal pulses in response to the light bursts, the improvement comprising: beam splitting means for separating said light beam into plural secondary light beams, the spacing between said secondary beams being at least equal to the distance between adjoining ones of the apertures in said aperture means, said plural secondary light beams assuring distortion free production of the signal pulses in the event one or more of the apertures in said aperture means are closed or misaligned.
Claim 3
Dependent Claim
29 words
The apparatus according to claim 1 including collecting means arranged between said aperture means and said signal generating means for focusing said light bursts onto said signal generating means.
Claim 4
Dependent Claim
17 words
The apparatus according to claim 1 in which said signal generating means includes at least one photocell.
Claim 5
Dependent Claim
17 words
The apparatus according to claim 1 in which said beam splitting means comprises an amplitude optical grating.
Claim 6
Dependent Claim
16 words
The apparatus according to claim 1 in which said beam splitting means comprises a phase grating.
Claim 7
Dependent Claim
19 words
The apparatus according to claim 5 in which said phase grating comprises a plurality of equally spaced cylindrical lenses.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |