Film transparency projector

Details Film transparency projector Film transparency projector

1981-09-16

1984-06-12

Haroian, Harry N.

Optics: image projectors

Temperature control

Heat filter

353 57, 353 56, G03B 2116

Patent

active

044538103

ABSTRACT:
A film transparency projector including a housing, a source of illumination for projecting light through a film transparency, a lens for focusing the image on a desired surface, an infrared filter for resisting passage of infrared radiation from the source of illumination to the film transparency, an ultraviolet filter for resisting passage of ultraviolet radiation from the source of illumination to the film transparency the ultraviolet filter including a filter member composed of an acrylic material having an ultraviolet absorbing additive and a vent for exhausting air from the housing. The infrared filter may consist of two angularly disposed spaced infrared filters. The ultraviolet absorbing material may be selected from the group consisting of benzophenones, benzotriazoles, substituted acrylonitriles and phenol-nickel complexes. The acrylic material may include methyl methacrylate.

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patent: 2464887 (1949-03-01), Osterberg et al.
patent: 2552184 (1951-05-01), Koch
patent: 2668478 (1954-02-01), Schroder
patent: 3632198 (1972-01-01), Poffer
patent: 3944352 (1976-03-01), Morgan

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