Patent US5017944A successfully refreshed from Google Patents.
US5017944A
Expired / Lapsed
US
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Control system for information recording laser beam
Assignee: Victor Company of Japan Ltd
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Filing: 1990-03-01
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Granted: 1991-05-21
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Expires: 2010-03-01
Abstract
Abstract In a control system for an information recording laser beam, an intensity of a laser beam is varied in a predetermined variation pattern during each of sequential one-pixel periods. The laser beam is periodically activated and deactivated in synchronism with a change of the one-pixel periods. A duration of the activating the laser beam within each of the one-pixel periods is controlled in accordance with a density of each of pixels of an image to be recorded.
Inventors
- 👤 Hiroki Kitamura
- 👤 Itsuo Takanashi
- 👤 Takashi Yamamura
- 👤 Toshikatsu Ichitou
- 👤 Hiromichi Tai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:40
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; H04N1/40037; H04N1/405; H04N1/4055; H04N1/4056
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A control system for an information recording laser beam, comprising: means for varying an intensity of a laser beam in a predetermined variation pattern during each of sequential one-pixel periods; means for periodically activating and deactivating the laser beam in synchronism with a change of the one-pixel periods; and means for controlling a duration of said activating the laser beam within each of the one-pixel periods in accordance with a density of each pixel of an image to be recorded.
Claim 2
Dependent Claim
80 words
A control system for an information recording laser beam, comprising: means for varying an intensity of a laser beam in a predetermined variation pattern during each of sequential one-pixel periods; means for periodically activating and deactivating the laser beam in synchronism with a change of the one-pixel periods; and means for controlling a duration of said activating the laser beam within each of the one-pixel periods in accordance with a density of each pixel of an image to be recorded.
Claim 3
Dependent Claim
76 words
The control system of claim 1 wherein the activating/deactivating means comprises means for periodically activating the laser beam in response to pulses of a pulse signal; a width of each of the pulses determines the duration of the activating the laser beam within each of the one-pixel periods; and the controlling means comprises means for controlling the width of each of the pulses in accordance with the density of each of the pixels of the image.
Claim 4
Dependent Claim
145 words
A control system for an information recording laser beam emitted from a laser, comprising: means for varying an intensity of a laser beam in a variation pattern during each of sequential one-pixel periods; means for periodically activating and deactivating the laser beam in synchronism with a change of the one-pixel periods; means for controlling a duration of said activating the laser beam within each of the one-pixel periods in accordance with a density of each of pixel of an image to be recorded; means for detecting at least one of a wrong variation in the intensity of the laser beam and a wrong variation in a scan condition of the laser beam; and means for adjusting a peak level and a minimal level of the variation pattern to correct the intensity of the laser beam in accordance with at least one of the wrong variations.
Claim 5
Dependent Claim
145 words
A control system for an information recording laser beam emitted from a laser, comprising: means for varying an intensity of a laser beam in a variation pattern during each of sequential one-pixel periods; means for periodically activating and deactivating the laser beam in synchronism with a change of the one-pixel periods; means for controlling a duration of said activating the laser beam within each of the one-pixel periods in accordance with a density of each of pixel of an image to be recorded; means for detecting at least one of a wrong variation in the intensity of the laser beam and a wrong variation in a scan condition of the laser beam; and means for adjusting a peak level and a minimal level of the variation pattern to correct the intensity of the laser beam in accordance with at least one of the wrong variations.
Claim 6
Dependent Claim
76 words
The control system of claim 3 wherein the activating/deactivating means comprises means for periodically activating the laser beam in response to pulses of a pulse signal; a width of each of the pulses determines the duration of the activating the laser beam within each of the one-pixel periods; and the controlling means comprises means for controlling the width of each of the pulses in accordance with the density of each of the pixels of the image.
Claim 7
Dependent Claim
65 words
A control system for an information recording laser beam whose intensity is modulated by a sequence of pulses, the system comprising: means for periodically varying a duty factor of the pulse sequence in synchronism with a change of successive one-pixel periods; and means for maximizing the duty factor of the pulse sequence at a time corresponding to a central part of each of one-pixel regions.
Claim 8
Dependent Claim
65 words
A control system for an information recording laser beam whose intensity is modulated by a sequence of pulses, the system comprising: means for periodically varying a duty factor of the pulse sequence in synchronism with a change of successive one-pixel periods; and means for maximizing the duty factor of the pulse sequence at a time corresponding to a central part of each of one-pixel regions.
Claim 9
Dependent Claim
30 words
The control system of claim 5 wherein the varying means comprises means for varying a frequency of the pulse sequence in synchronism with the change of the successive one-pixel periods.
Claim 10
Dependent Claim
31 words
The control system of claim 5 wherein the varying means comprises means for varying a width of each of the pulses in synchronism with the change of the successive one-pixel periods.
References Cited (Backward Citations)
JPS54115254A
Cited
JPS5691228A
Cited
US4477821A
Cited
JPS58212256A
Cited
JPS59146068A
Cited
JPS61124921A
Cited
JPS61277259A
Cited
JPS61277258A
Cited
JPS62236204A
Cited
JPS62247671A
Cited
US4864419A
Cited
JPS6418621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |