Light source for multiple image projection device

Details Light source for multiple image projection device Light source for multiple image projection device

1977-03-22

1978-11-07

Lechert, Jr., Stephen J.

Illumination

Light source and modifier

Including reflector

362346, 362347, 362350, F21V 700

Patent

active

041248821

ABSTRACT:
A microfiche on which a large number of characters are formed in an alternating arrangement is movable behind a mask in such a manner that at each position of the microfiche relative to the mask a desired group of characters is displayed through respective apertures in the mask. Lenses are disposed behind the apertures to project images of the characters therethrough onto a viewing screen. A reflection support member is disposed behind the microfiche and is formed with a stepped surface on which are disposed a plurality of concave reflectors, one reflector behind each lens. A lamp radiates light onto the reflectors, from which the light is reflected and focussed into the respective lenses, thereby illuminating the characters on the microfiche from behind. The radii of curvature and light receiving frontal areas of the reflectors differ in accordance with the distances of the reflectors from the lamp and the respective lenses.

REFERENCES:
patent: 4007985 (1977-02-01), Yevick

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