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 Title: |
US3596083:
APPARATUS FOR PRODUCING A UNIFORM LIGHT FIELD
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| Country: |
US United States of America
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| Inventor: |
Lovering, Howard B.; Bedford, MA
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| Assignee: |
G. C. A. Corporation, Bedford, MA
other patents from GCA CORPORATION (215970) (approx. 55)
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| Published / Filed: |
1971-07-27
/ 1969-04-11
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| Application Number: |
US1969000815470
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| IPC Code: |
Advanced:
G02B 6/42;
G03B 27/54;
Core:
more...
IPC-7:
F21M 7/00;
G02B 5/16;
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| U.S. Class: |
Current:
362/551;
355/067;
Original:
240/041.R;
240/001.EI;
350/096.B;
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| Field of Search: |
240/001,1.4,1 EI,41,41.1
350/096,314
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| Priority Number: |
| 1969-04-11 |
US1969000815470 |
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| Abstract: |
A projector for microreduction photographic apparatus in which light from an arc discharge source is collimated and filtered to pass only wavelengths to which photosensitive material is responsive and then focused upon the entrance face of a fiber optics bundle, the entrance face being contoured to match the configuration of the focused image. The fiber bundle has an exit face circular in cross section and the fibers are randomly dispersed so that fibers in any given area of the entrance face are dispersed throughout the total area of the circular exit face in order to provide a uniform light field, a condenser lens system directs the rays emitted from the exit face of the bundle uniformly upon the entrance pupil of a projection lens; thus the radiation from the nearly rectangular arc discharge is transformed at maximum efficiency into a uniform, collimated, narrow band source for the projection lens.
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| Attorney, Agent or Firm: |
Kenway, Jenney and Hildreth ;
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| Primary / Asst. Examiners: |
Peters, Jr., Joseph F.;
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 6 claims |
Having now described and illustrated a preferred embodiment of the invention, what I claim as new and on which I desire a United States Letters Patent is:
1. Apparatus for producing a uniform light field for use in exposing high-contrast, high-resolution photosensitive materials, comprising:
- a light source;
- a first lens for collimating light rays, said lens being corrected for spherical aberration;
- a second lens for focusing said collimated rays upon a target;
- a bundle of elongated, optically transparent fibers terminating in an optical entrance face at one end of the bundle, said face comprising said target, and terminating in an optical exit face at the other end of the bundle;
- the ends of the fibers at the entrance face being disposed in a first array having a shape whose envelope circumscribes the image of the light source;
- the ends of the fibers at the exit face being disposed in a circular array in which the fibers of any group of fibers lying in any given area of the entrance face are randomly dispersed throughout the area of the exit face, whereby the distribution of light in said circular array is substantially uniform, the area of said circular array being approximately equal to the area of said first array; and
- a lens system for focusing an image of said circular array upon a plane disposed at a predetermined location.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 25 U.S. patent(s) that reference this one
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