Illumination apparatus

Photocopying – Projection printing and copying cameras – Multicolor picture

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Details

355 18, G03B 2772, G03B 2776

Patent

active

044326360

ABSTRACT:
In a photographic enlarger apparatus having a diffusion light head and utilizing interchangeable and differently sized light mixing chambers for transmission of light through negatives of various sizes, a light source positioning means is provided. The positioning means moves the light source so that it cooperates with a plurality of mixing chambers, each having a light exit sized to conform to a given transparency size, in order to minimize the length of the optical path. The positioning means also maintains the light beam in optical alignment with the light inlet of a selected light mixing chamber. Utilizing the present invention, a common optical axis may be maintained through all negatives and improved light image characteristics are obtained by reduction of the length of the optical path from the light source to the transparency.

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patent: 4189229 (1980-02-01), Guillaume

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