Patent US4805973A successfully refreshed from Google Patents.
US4805973A
Expired / Lapsed
US
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Method of recording continuous tone image
Assignee: Fujifilm Holdings Corp
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Filing: 1986-04-02
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Granted: 1989-02-21
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Expires: 2006-04-02
Abstract
Abstract In a method of recording a continuous tone image by controlling a drive current for a semiconductor laser in accordance with image density signal and modulating the intensity of a laser beam emitted by the semiconductor laser, laser beams emitted by a plurality of semiconductor lasers which respectively emit laser beams of wavelength ranges with regard to the spectral sensitivity of the photosensitive material. The photosensitive material is scanned by a coalesced laser beam, and the drive current of the respective semiconductor lasers is controlled.
Inventors
- 👤 Hideo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:16
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40037
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
In a continuous tone image recording method for controlling a drive circuit of a semiconductor laser to modulate the intensity of a laser beam emitted therefrom in accordance with an image density signal, and scanning a continuous tone-forming photosensitive material with the intensity modulated laser beam to record a continuous tone image on the photosensitive material, the improvement comprising the steps of: providing a plurality of semiconductor lasers, controlling drive currents of the respective semiconductor lasers to thereby produce plural intensity modulated laser beams, coalescing the laser beams emitted by said plurality of semiconductor lasers, said lasers respectively emitting laser beams of different wavelengths, the spectral sensitivity of said photosensitive material being different for said different wavelengths, and scanning said photosensitive material with the coalesced laser beam.
Claim 2
Dependent Claim
127 words
In a continuous tone image recording method for controlling a drive circuit of a semiconductor laser to modulate the intensity of a laser beam emitted therefrom in accordance with an image density signal, and scanning a continuous tone-forming photosensitive material with the intensity modulated laser beam to record a continuous tone image on the photosensitive material, the improvement comprising the steps of: providing a plurality of semiconductor lasers, controlling drive currents of the respective semiconductor lasers to thereby produce plural intensity modulated laser beams, coalescing the laser beams emitted by said plurality of semiconductor lasers, said lasers respectively emitting laser beams of different wavelengths, the spectral sensitivity of said photosensitive material being different for said different wavelengths, and scanning said photosensitive material with the coalesced laser beam.
Claim 3
Dependent Claim
22 words
A method as defined in claim 1 wherein said semiconductor lasers emit laser beams having wavelengths of 910 nm and 800 nm.
Claim 4
Dependent Claim
50 words
A method as defined in claim 1 wherein said photosensitive material exhibits spectral sensitivity characteristics such that the relative sensitivity with respect to one of said laser beams at a first wavelength is approximately 1/10 the relative sensitivity with respect to one of said laser beams at a second wavelength.
Claim 5
Dependent Claim
21 words
A method as defined in claim 1 wherein said photosensitive material is scanned by said coalesced laser beam in two directions.
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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |