Light-mixing compartment for a light projector

Details Light-mixing compartment for a light projector Light-mixing compartment for a light projector

1977-08-17

1978-12-26

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2776

Patent

active

041313623

ABSTRACT:
A light mixing compartment for a projector, such as incorporated in a photographic copier or enlarger, has four convexly curved side panels disposed between the entrance and exit, which are covered by light diffusing plates. The cross sections of the compartment parallel to its diffusing plates are cylindrical or rectangular with the sides having different angles of inclination adjacent the entrance from those at the exit. The ultimate slope of the sides adjacent the exit preferably is a right angle, and the overall shape of the convexly curved sides is adjusted to control the marginal brightness of the light format emitted from the compartment. The four convexly curved sides are held together by appropriately shaped bands riveted to the sides for securing them together.

REFERENCES:
patent: 1097211 (1914-05-01), Bechstein
patent: 2294580 (1942-09-01), Skinner et al.
patent: 2530843 (1950-11-01), Smith
patent: 3241437 (1966-03-01), Thiels
patent: 3817617 (1974-06-01), Weinert

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