Patent US4864326A successfully refreshed from Google Patents.
US4864326A
Expired / Lapsed
US
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Dual beam recorder
Assignee: Canon Inc
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Filing: 1988-01-04
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Granted: 1989-09-05
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Expires: 2008-01-04
Abstract
Abstract A recorder has a beam generator for generating a beam to form a dot image on a record medium. The beam generator has first and second beam generation sources to generate first and second beams and forms each dot by using both of the first and second beams.
Inventors
- 👤 Naoto Kawamura
- 👤 Takashi Kitamura
- 👤 Shinichi Ohta
- 👤 Yuji Nishigaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:01
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; H04N1/024; H04N1/032; H04N1/036; H04N1/04; H04N1/047; H04N1/0473; H04N1/19; H04N1/191; H04N1/1911; H04N1/1916; H04N1/40031; H04N1/40037; H04N1/405; H04N1/4055; H04N1/4056; H04N1/113; H04N1/1135; H04N1/12; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04712; H04N2201/04734; H04N2201/04744; H04N2201/04749; H04N2201/04753; H04N2201/04758
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
125 words
A recorder comprising: a record medium on which an image is to be recorded; beam generation means for generating a beam to form an image on said record medium, wherein said beam generation means includes first and second beam generation sources for generating first and second beams, respectively, and said first and second beams generated from said first and second beam generation sources, respectively, are combined to form an image on said record medium; detection means for detecting an actual displacement of the beam directed to said record medium; and control means for controlling the light energy of each of said first and second beams to change a peak position of the combined beams in accordance with the actual displacement detected by said detection means.
Claim 2
Dependent Claim
125 words
A recorder comprising: a record medium on which an image is to be recorded; beam generation means for generating a beam to form an image on said record medium, wherein said beam generation means includes first and second beam generation sources for generating first and second beams, respectively, and said first and second beams generated from said first and second beam generation sources, respectively, are combined to form an image on said record medium; detection means for detecting an actual displacement of the beam directed to said record medium; and control means for controlling the light energy of each of said first and second beams to change a peak position of the combined beams in accordance with the actual displacement detected by said detection means.
Claim 3
Dependent Claim
18 words
A recorder according to claim 1 wherein said detection means includes photo detection means for detecting said beam.
Claim 4
Dependent Claim
41 words
A recorder according to claim 2 wherein said detection means is arranged at a scan position of said beam, and the detection output of said detection means is used as a synchronization signal to form the image on said record medium.
Claim 5
Dependent Claim
29 words
A recorder according to claim 1 wherein said recording medium includes a photo-sensitive drum, and said first and second beam: generation sources include first and second semiconductor laser devices.
Claim 6
Dependent Claim
34 words
A recorder according to claim 1, wherein a distance between the centers of focused spots of said first and second beams on said record medium is less than a scan pitch of said beam.
Claim 7
Dependent Claim
124 words
A recorder comprising: image data output means; first and second half tone processing means for performing respective first and second half tone processing of the same image data outputted from said image data output means; and first and second image forming means for forming an image on a record medium in accordance with the outputs from said first and second half tone processing means, respectively, wherein said first and second image forming means include first and second beam generation sources for generating first and second beams, respectively, said first and second beam generation sources modulating the beams in accordance with the data produced by said first and second half tone processing means, respectively, so as to form a reproduced image on said record medium.
Claim 8
Dependent Claim
124 words
A recorder comprising: image data output means; first and second half tone processing means for performing respective first and second half tone processing of the same image data outputted from said image data output means; and first and second image forming means for forming an image on a record medium in accordance with the outputs from said first and second half tone processing means, respectively, wherein said first and second image forming means include first and second beam generation sources for generating first and second beams, respectively, said first and second beam generation sources modulating the beams in accordance with the data produced by said first and second half tone processing means, respectively, so as to form a reproduced image on said record medium.
Claim 9
Dependent Claim
43 words
A recorder according to claim 6, further comprising γ-conversion means for converting the density of the image data produced by said output means, wherein the output of said γ-conversion means is supplied to both of said first and second half tone processing means.
Claim 10
Dependent Claim
34 words
A recorder according to claim 7, further comprising delay means for delaying the output of said γ-conversion means, wherein the output of said delay means is applied to said second half tone processing means.
Claim 11
Dependent Claim
29 words
A recorder according to claim 6, wherein said record medium includes a photosensitive drum, and said first and second beam generation sources include first and second semiconductor laser devices.
Claim 12
Dependent Claim
40 words
A recorder according to claim 6, wherein said first and second half tone processing means perform respective first and second processes of said image data so as to reproduce an image having a different screen angle on said record medium.
Claim 13
Dependent Claim
36 words
A recorder according to claim 10, wherein said first and second half tone processing means perform respective first and second half tone processes by using first and second threshold matrices having different arrangements from each other.
Claim 14
Dependent Claim
34 words
A recorder according to claim 10, wherein said first and second half tone processing means perform respective first and second half tone processes by using first and second pulse patterns different from each other.
Claim 15
Dependent Claim
20 words
A recorder according to claim 12, wherein said first and second pulse patterns are different in phase from each other.
Claim 16
Dependent Claim
27 words
A recorder according to claim 13, wherein said first and second pulse patterns are respective first and second right angle waves having different phases from each other.
Claim 17
Dependent Claim
19 words
A recorder according to claim 7, wherein said γ-conversion means reduces a density level of image data inputted therein.
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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |