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US 4,225,224 AGranted
Process and apparatus for laser illumination of printing plates
AssigneeThe United States of America as represented by the Secretary of the Army
InventorN. Balasubramanian
Life of this patent
Estimating the term…
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.
Claims8
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.
5 more elements
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.
2 more elements
Dependencies are inferred from the claim text.