US4620200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scan beam velocity-compensation recording system
Assignee: Fujifilm Holdings Corp
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Filing: 1985-09-26
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Granted: 1986-10-28
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Expires: 2005-09-26
Abstract
Abstract A recording medium scanning system includes a light source for generating a scanning light beam, a light modulator for modulating the light beam with a modulating signal, and a scanner for scanning a recording medium with the modulated light beam emitted from the light modulator. The scanning speed of a light beam emitted from the scanning means is detected by a scanning speed detector which issues a scanning speed signal indicative of the detected scanning speed. An arithmetic operation such as a multiplication or a division is effected on the scanning speed signal issued from the scanning speed detector and a recording signal. The result of the arithmetic operation is applied as the modulating signal to the light modulator.
Inventors
- 👤 Nobutaka Fukai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:31
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/14; G01D9/00; G01D9/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A recording medium scanning system comprising: (i) a light source for generating a scanning light beam; (ii) a light modulator for modulating said light beam with a modulating signal; (iii) scanning means for scanning a recording medium with the modulated light beam emitted from said light modulator; (iv) scanning speed detecting means for detecting the scanning speed of a light beam emitted from said scanning means to issue a scanning speed signal indicative of the detected scanning speed; and (v) arithmetic means for effecting an arithmetic operation on the scanning speed signal issued from said scanning speed detecting means and a recording signal and for applying the result of said arithmetic operation as said modulating signal to said light modulator.
Claim 2
Dependent Claim
120 words
A recording medium scanning system comprising: (i) a light source for generating a scanning light beam; (ii) a light modulator for modulating said light beam with a modulating signal; (iii) scanning means for scanning a recording medium with the modulated light beam emitted from said light modulator; (iv) scanning speed detecting means for detecting the scanning speed of a light beam emitted from said scanning means to issue a scanning speed signal indicative of the detected scanning speed; and (v) arithmetic means for effecting an arithmetic operation on the scanning speed signal issued from said scanning speed detecting means and a recording signal and for applying the result of said arithmetic operation as said modulating signal to said light modulator.
Claim 3
Dependent Claim
42 words
A recording medium scanning system according to claim 1, wherein said arithmetic means comprises an arithmetic unit for effecting a multiplication or a division on said scanning speed signal and said recording signal and for producing the result as said modulating signal.
Claim 4
Dependent Claim
59 words
A recording medium scanning system according to claim 1, wherein said arithmetic means comprises an arithmetic unit for effecting a multiplication or a division on said scanning speed signal and said recording signal and for producing the result as a correcting signal, and an adder for adding said correcting signal and said recording signal to produce said modulating signal.
Claim 5
Dependent Claim
39 words
A recording medium scanning system according to claim 1, wherein said scanning speed detecting means comprises a grid and a light detector disposed behind said grid for detecting the light beam emitted from said scanning means through said grid.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |