Overhead projection system with lens assembly having concentrica

Details Overhead projection system with lens assembly having concentrica Overhead projection system with lens assembly having concentrica

1977-01-13

1978-03-21

Aegerter, Richard E.

Optics: image projectors

Unitary plural refracting surfaces

353 55, 353 97, 353 98, 353DIG3, 362294, G03B 21132, G03B 2114

Patent

active

040800520

ABSTRACT:
An overhead projection system which includes a planar lens assembly having two concentrically-oriented condensing lenses. The outer lens has a greater focal length than the inner lens to receive light reflected from the system's reflector while the inner condensing lens receives direct lighting from the system's light source. Accordingly, the inner lens images the light source at the projection lens of the system and the outer lens images the virtual image of the light source.

REFERENCES:
patent: 3222981 (1965-12-01), Lucas
patent: 3255342 (1966-06-01), Seitz et al.
patent: 3547530 (1970-12-01), Poole
patent: 3770344 (1973-11-01), Fukushima
patent: 3818218 (1974-06-01), Heenan et al.
patent: 3915568 (1975-10-01), Yamada et al.

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