Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1990-07-05
1991-05-14
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 93, G03B 2772
Patent
active
050160478
ABSTRACT:
A light-modifier for changing the character of light flowing from a light source towards an image forming sheet and a sheet of light sensitive copy in an exposure device includes a roll of thin, flexible light-modifying plastic sheet material which is rotatably mounted for rolling and unrolling on a roller to extend between a first light-intercepting unrolled position extending outwardly between said image forming and copy sheets on the one hand and said light source on the other hand and a second, rolled-up position offset from the copy sheet. The apparatus may be made for sale as an accessory or optional item for a wide variety of existing exposure devices whenever it is desired to change the character or form of the light energy by diffusion, filtering or attenuation, and the apparatus may be directly incorporated as an integral part of a new exposure device.
REFERENCES:
patent: 3677633 (1972-07-01), Huber
patent: 3738748 (1973-06-01), Weihsmantel et al.
patent: 4090786 (1978-05-01), Bobbe
patent: 4240743 (1980-12-01), Hilboki et al.
patent: 4536085 (1985-08-01), Hilboki et al.
patent: 4600666 (1986-07-01), Zink
patent: 4636064 (1987-01-01), Penza
patent: 4801969 (1989-01-01), Hamidian
Hix L. T,.
nuArc Company, Inc.
Rutledge D.
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