US3751587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser printing system
Assignee: COPYSTATICS Inc C/O LOWENTHAL A DE CORP
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Filing: 1972-01-20
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Granted: 1973-08-07
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Expires: 1992-01-20
Abstract
Abstract A modulated laser beam developed in a non-contacting printing arrangement sweeps across an ink bearing carrier disposed adjacent a printing surface, e.g., an untreated paper sheet. In successive line sweeps, each slightly displaced from the prior sweep line, the incident laser beam selectively transfers printing materials, such as ink, from the carrier to the paper surface in accordance with the laser modulation intelligence. The modulator reduces or shutters the laser beam in such manner as to prevent ink transfer where printing is not desired and allows the laser beam to pass or directs the laser beam to points where printing is desired. Printing speed for the composite printing system directly depends upon the rate at which ink can be displaced from its carrier, and therefore ultimately upon laser power. In a copying machine context, the laser modulating information is developed by scanning the original document to be reproduced. In accordance with the present invention, the laser beam is alternately accelerated and slowed with respect to the average sweep rate across the ink bearing carrier during printing to essentially dwell at such points on the carrier where it is desired that ink be displaced onto the printing surface during the sweep of a line trace. Accordingly, the power of the laser beam required to transfer ink is reduced, and thereby also permissible printing speeds are increased, by reason of the swell of the laser beam on the ink vis-a-vis that situation where the laser beam is swept at a constant speed acros the ink bearing carrier.
Inventors
- 👤 J Insler
- 👤 A Leslie
- 👤 R Vigneri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/17; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; H04N1/113; H04N1/1135
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
83 words
In combination in a laser printing arrangement, laser means for supplying an output laser beam, modulator means for modulating said laser output beam in accordance with graphic information, an ink bearing surface, beam sweeping means for repetitively sweeping said modulated laser beam across said ink bearing surface, and laser beam deflector means operatively disposed between said laser and said ink bearing surface for selectively deflecting a portion of said laser beam in a direction opposite to that effected by said beam sweeping means.
Claim 2
Dependent Claim
83 words
In combination in a laser printing arrangement, laser means for supplying an output laser beam, modulator means for modulating said laser output beam in accordance with graphic information, an ink bearing surface, beam sweeping means for repetitively sweeping said modulated laser beam across said ink bearing surface, and laser beam deflector means operatively disposed between said laser and said ink bearing surface for selectively deflecting a portion of said laser beam in a direction opposite to that effected by said beam sweeping means.
Claim 3
Dependent Claim
72 words
A combination as in claim 1 wherein said laser beam deflector means comprises a beam deflector including beam receiving and beam exciting ports and a beam deflector control port, and control port exciting means for exciting said beam deflector control port with a control excitation which alternately monotonically increases and monotonically decreases in its deflector controlling parameter for controlling the angle of deflection of the deflected portion of said laser output beam.
Claim 4
Dependent Claim
15 words
A combination as in claim 2 wherein said laser beam deflector comprises an acousto-optic deflector.
Claim 5
Dependent Claim
18 words
A combination as in claim 3 wherein said deflector control port exciting means comprises a voltage controlled oscillator.
Claim 6
Dependent Claim
32 words
A combination as in claim 4 further comprising triangular waveform generating means connected to said voltage controlled oscillator whose output frequency depends directly on the magnitude of the voltage applied to it.
Claim 7
Dependent Claim
37 words
A combination as in claim 4 wherein said modulator means includes gate means disposed intermediate said voltage controlled oscillator and said laser beam deflector means, and means for operating said gate means in accordance with graphic information.
Claim 8
Dependent Claim
30 words
A combination as in claim 1 further comprising means for scanning an original document, and means for controlling said modulator means in accordance with the output of said scanning means.
Claim 9
Dependent Claim
13 words
A combination as in claim 7 wherein said scanning means includes quantizing means.
Claim 10
Dependent Claim
22 words
A combination as in claim 1 further comprising means synchronized with said optical sweeping means for controlling said laser beam deflecting means.
Claim 11
Dependent Claim
19 words
A combination as in claim 1 wherein said modulator means comprises means for controlling said laser beam deflecting means.
Claim 12
Dependent Claim
18 words
A combination as in claim 1 further comprising printing surface means disposed proximate to said ink bearing surface.
Claim 13
Dependent Claim
88 words
In combination in a laser printing arrangement, laser means for supplying an output laser beam, a printing material surface, laser beam deflector means operatively disposed between said laser and said printing material surface, and beam sweeping means for repetitively sweeping the portion of the output laser beam deflected by said laser beam deflector means across said printing material surface, said laser beam deflector means deflecting a portion of said laser beam over said printing material surface in a direction opposite to that effected by said beam sweeping means.
Claim 14
Dependent Claim
88 words
In combination in a laser printing arrangement, laser means for supplying an output laser beam, a printing material surface, laser beam deflector means operatively disposed between said laser and said printing material surface, and beam sweeping means for repetitively sweeping the portion of the output laser beam deflected by said laser beam deflector means across said printing material surface, said laser beam deflector means deflecting a portion of said laser beam over said printing material surface in a direction opposite to that effected by said beam sweeping means.
Claim 15
Dependent Claim
72 words
A combination as in claim 12 wherein said laser beam deflector means comprises a beam deflector including beam receiving and beam exciting ports and a beam deflector control port, and control port exciting means for exciting said beam deflector control port with a control excitation which alternately monotonically increases and monotonically decreases in its deflector controlling parameter for controlling the angle of deflection of the deflected portion of said laser output beam.
Claim 16
Dependent Claim
28 words
A combination as in claim 13 wherein said laser Beam deflector comprises an acousto-optic deflector, and wherein said deflector control port exciting means comprises a voltage controlled oscillator.
Claim 17
Dependent Claim
32 words
A combination as in claim 14 further comprising triangular waveform generating means connected to said voltage controlled oscillator whose output frequency depends directly on the magnitude of the voltage applied to it.
Claim 18
Dependent Claim
43 words
A combination as in claim 14 further comprising modulator means for modulating said output laser beam including gate means disposed intermediate said voltage controlled oscillator and said laser beam deflector means, and means for operating said gate means in accordance with graphic information.
Claim 19
Dependent Claim
30 words
A combination as in claim 16 further comprising means for scanning an original document, and means for controlling said modulator means in accordance with the output of said scanning means.
Claim 20
Dependent Claim
13 words
A combination as in claim 17 wherein said scanning means includes quantizing means.
Claim 21
Dependent Claim
19 words
A combination as in claim 16 wherein said modulator means comprises means for controlling said laser beam deflecting means.
Claim 22
Dependent Claim
22 words
A combination as in claim 12 further comprising means synchronized with said optical sweeping means for controlling said laser beam deflecting means.
Claim 23
Dependent Claim
23 words
A combination as in claim 12 wherein said printing material surface comprises a marking material adapted for spatial dislocation responsive to energy absorption.
Claim 24
Dependent Claim
23 words
A combination as in claim 21 further comprising printing surface means disposed proximate to said printing material surface for receiving dislocated marking material.
Claim 25
Dependent Claim
33 words
A combination as in claim 12 wherein said printing material surface comprises means for forming a latent image responsive to incident laser beam energy adapted for forming by further processing a visual image.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |