Patent US4835568A successfully refreshed from Google Patents.
Patent US5283793A successfully refreshed from Google Patents.
US5283793A
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Laser beam recording apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1992-12-09
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Granted: 1994-02-01
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Expires: 2012-12-09
Abstract
Abstract A laser beam recording apparatus is provided with a semiconductor laser for producing a laser beam, and a beam scanning system for scanning the laser beam on a photosensitive material. A laser operation control circuit produces a light emission level instructing signal corresponding to an image signal and controls a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam. A device superimposes a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
Inventors
- 👤 Takashi Shoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1209; G06K15/1214; H01; H01S; H01S5/00; H01S5/06; H01S5/062; H01S5/06209; H04N1/40037; H01S5/06213; H01S5/065; H01S5/0651; H01S5/0652; H01S5/068; H01S5/06817
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A laser beam recording apparatus provided with a semiconductor laser for producing a laser beam, a beam scanning system for scanning the laser beam on a photosensitive material, and a laser operation control circuit for producing a light emission level instructing signal corresponding to an image signal, and controlling a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam, wherein the improvement comprises the provision of a means for superimposing a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
Claim 2
Dependent Claim
121 words
A laser beam recording apparatus provided with a semiconductor laser for producing a laser beam, a beam scanning system for scanning the laser beam on a photosensitive material, and a laser operation control circuit for producing a light emission level instructing signal corresponding to an image signal, and controlling a drive current for the semiconductor laser over a natural light emission region and a laser oscillation region on the basis of the light emission level instructing signal, thereby to modulate the intensity of the laser beam, wherein the improvement comprises the provision of a means for superimposing a radio-frequency current upon the drive current for the semiconductor laser only in a region in which the drive current exceeds a predetermined value.
Claim 3
Dependent Claim
40 words
An apparatus as defined in claim 1 wherein said means for superimposing the radio-frequency current upon the drive current for the semiconductor laser increases an amplitude of the radio-frequency current as the drive current for the semiconductor laser becomes larger.
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) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |