US4587531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clock signal producing apparatus
Assignee: Eastman Kodak Co
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Filing: 1984-11-05
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Granted: 1986-05-06
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Expires: 2004-11-05
Abstract
Abstract Apparatus is disclosed for producing clock signals which are used to precisely control the modulation of a light beam by an acousto-optic modulator as it is line scanned by a moving mirror. The apparatus employs a set of spaced detectors which are located in the scanned beam path and respectively produce start-of-scan (SOS) and end-of-scan (EOS) signals. An oscillator which includes a delay line is responsive to the SOS and EOS signals to produce the clock signals. The delay line coupled to a NOR gate and flip-flop produces a delay line with the precise period τ.
Inventors
- 👤 Paul E. Dangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/053; H04N1/113; H04N1/1135; H04N1/12; H04N2201/00; H04N2201/024; H04N2201/02406; H04N2201/02439; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04732; H04N2201/04744; H04N2201/04753; H04N2201/04755; H04N2201/04758; H04N2201/04767; H04N2201/04794
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
In apparatus for producing output signals which have a precise period, these signals control the timing of information-wise modulation of a laser light beam scanned across a photosensitive surface by rotating polygon, such apparatus including a first detector which is located in the scanned beam path and produces a start-of-scan (SOS) signal, and a second detector which is located in the scanned beam path and produces an end-of-scan (EOS) signal; the improvement comprising a τ/2 delay line which produces the output signals; a nor gate coupled to the delay line and connected to receive the output signals; and a flip-flop controlled by the (SOS) and (EOS) signals and providing an input signal to the nor gate such that the output signals produced by the delay line have a precise period τ.
Claim 2
Dependent Claim
131 words
In apparatus for producing output signals which have a precise period, these signals control the timing of information-wise modulation of a laser light beam scanned across a photosensitive surface by rotating polygon, such apparatus including a first detector which is located in the scanned beam path and produces a start-of-scan (SOS) signal, and a second detector which is located in the scanned beam path and produces an end-of-scan (EOS) signal; the improvement comprising a τ/2 delay line which produces the output signals; a nor gate coupled to the delay line and connected to receive the output signals; and a flip-flop controlled by the (SOS) and (EOS) signals and providing an input signal to the nor gate such that the output signals produced by the delay line have a precise period τ.
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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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |