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US4806946A
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Light beam scanning recording method
Assignee: Fujifilm Holdings Corp
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Filing: 1987-12-23
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Granted: 1989-02-21
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Expires: 2007-12-23
Abstract
Abstract In a light beam scanning recording method, a continuous tone image is recorded on a photosensitive material by scanning a light beam deflected by a rotating polygon mirror on the photosensitive material and carrying out pulse number modulation or pulse width modulation of the light beam in accordance with image signals. A single picture element string is scanned by the light beam a plural number of times which is equal to integral multiples of the number of mirror surfaces of the rotating polygon mirror. The number of pulses per picture element or the pulse width per picture element is distributed among the plural number of times of scanning so that the total number of pulses per picture element or the total pulse width per picture element in the plural number of times of scanning coincides with a predetermined value.
Inventors
- 👤 Masahiro Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40037; H04N1/405; H04N1/4055; H04N1/4056
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A light beam scanning recording method for recording a continuous tone image on a photosensitive material by scanning a light beam deflected by a rotating polygon mirror on the photosensitive material and carrying out pulse number modulation or pulse width modulation of the light beam in accordance with image signals, wherein the improvement comprises the steps of: (i) scanning a single picture element string by said light beam a plural number of times which is equal to integral multiples of the number of mirror surfaces of said rotating polygon mirror, and (ii) distributing the number of pulses per picture element or the pulse width per picture element among said plural number of times of scanning so that the total number of pulses per picture element or the total pulse width per picture element in said plural number of times of scanning coincides with a predetermined value.
Claim 2
Dependent Claim
146 words
A light beam scanning recording method for recording a continuous tone image on a photosensitive material by scanning a light beam deflected by a rotating polygon mirror on the photosensitive material and carrying out pulse number modulation or pulse width modulation of the light beam in accordance with image signals, wherein the improvement comprises the steps of: (i) scanning a single picture element string by said light beam a plural number of times which is equal to integral multiples of the number of mirror surfaces of said rotating polygon mirror, and (ii) distributing the number of pulses per picture element or the pulse width per picture element among said plural number of times of scanning so that the total number of pulses per picture element or the total pulse width per picture element in said plural number of times of scanning coincides with a predetermined value.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1 wherein the pulses for each picture element are distributed from the middle of a write period for each picture element to both sides thereof.
Claim 4
Dependent Claim
32 words
A method as defined in claim 1 wherein pulse modulation is carried out by combining high-frequency pulses and negative high-frequency pulses obtained by phase inversion of said high-frequency pulses with each other.
Claim 5
Dependent Claim
15 words
A method as defined in claim 1 wherein said light beam is a laser beam.
References Cited (Backward Citations)
US4560862A
Cited
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 |