US4225224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for laser illumination of printing plates
Assignee: United States Department of the Army
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Filing: 1979-03-13
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Granted: 1980-09-30
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Expires: 1999-03-13
Abstract
Abstract A laser projection and printing system wherein a laser beam is focused on e scan center of an X-Y galvo-deflector, passes through a condensing lens to a transparency to be projected, and is transmitted to an imaging lens for projection to a large format plate. The scanning galvinometer, condenser, and imaging lens render the laser beam effective to project the small transparency to a large format plate.
Inventors
- 👤 N. Balasubramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/20; G03F7/2051; G03F7/2053; G03F7/2055
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A laser printing and projection system comprising in combination: (a) a laser beam light source; (b) a first lens for focusing the culminated beam from the laser; (c) an X-Y galvo-deflection system having an apparent scan center for deflecting said focused, culminated beam from said first lens; (d) a second condensing lens for receiving the deflected focused culminated light from said X-Y galvo-deflection system; (e) a third imaging lens for receiving the light from said second condensing lens; (f) an input transparency placed between said culminating lens and said imaging lens; and (g) a printing plate placed beyond said imaging lens for receiving said culminated focused, scanned and imaged light which has passed through said transparency.
Claim 2
Dependent Claim
116 words
A laser printing and projection system comprising in combination: (a) a laser beam light source; (b) a first lens for focusing the culminated beam from the laser; (c) an X-Y galvo-deflection system having an apparent scan center for deflecting said focused, culminated beam from said first lens; (d) a second condensing lens for receiving the deflected focused culminated light from said X-Y galvo-deflection system; (e) a third imaging lens for receiving the light from said second condensing lens; (f) an input transparency placed between said culminating lens and said imaging lens; and (g) a printing plate placed beyond said imaging lens for receiving said culminated focused, scanned and imaged light which has passed through said transparency.
Claim 3
Dependent Claim
32 words
The laser printing projection system of claim 1 wherein said light from said condensing lens passes through the center of said imaging lens entrance pupil at all positions of said X-Y galvo-deflector.
Claim 4
Dependent Claim
17 words
The laser printing system of claim 1 wherein said transparency modulates said deflected culminated beam of light.
Claim 5
Dependent Claim
27 words
The laser printing and projection system of claim 1 wherein said first lens focuses the culminated light at the apparent scan center of the X-Y galvo-deflector system.
Claim 6
Dependent Claim
55 words
The laser printing and projection system of claim 1 wherein the illumination area on the plane of the transparency is equal to the product of the diameter of the laser beam, and the distance between the scan center and the back surface of the condenser, divided by the focal length of said first focusing lens.
Claim 7
Dependent Claim
36 words
The laser printing and projection system of claim 1 wherein the said galvo-deflector deflects the cone of diverging light in both the X and Y directions to fill the entire aperature or area of the transparency.
Claim 8
Dependent Claim
15 words
The apparatus of claim 1 wherein said transparency is placed next to said condensing lens.
Claim 9
Independent Claim
94 words
A method of projecting small transparencies to large format printing plates comprising the steps of: (a) focusing a laser beam on the apparent scan center of a moving X-Y galvo-deflection system; (b) condensing the moving light from said X-Y galvo-deflection system; (c) modulating said moving light from said condensing lens by passing through a transparency which is to be projected; (d) passing the modulated light from said transparency to an imaging lense center entrance pupil; (e) imaging said focused, deflected and modulated light which has passed through said transparency upon a large format plate.
Claim 10
Independent Claim
94 words
A method of projecting small transparencies to large format printing plates comprising the steps of: (a) focusing a laser beam on the apparent scan center of a moving X-Y galvo-deflection system; (b) condensing the moving light from said X-Y galvo-deflection system; (c) modulating said moving light from said condensing lens by passing through a transparency which is to be projected; (d) passing the modulated light from said transparency to an imaging lense center entrance pupil; (e) imaging said focused, deflected and modulated light which has passed through said transparency upon a large format plate.
References Cited (Backward Citations)
US3687543A
Cited
US3220013A
Cited
US3350156A
Cited
US3314073A
Cited
US3621133A
Cited
US3636251A
Cited
US3653067A
Cited
US3679818A
Cited
US3805275A
Cited
US3838912A
Cited
US3894756A
Cited
US3739370A
Cited
US3842195A
Cited
US3751587A
Cited
US3836709A
Cited
US3803637A
Cited
US3893129A
Cited
US3985439A
Cited
US4002829A
Cited
US3961334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |