Optics: image projectors – Film gate
Patent
1982-03-25
1984-03-06
Haroian, Harry N.
Optics: image projectors
Film gate
353 60, G03B 2116
Patent
active
044350546
ABSTRACT:
A film guide assembly for a film viewing device which projects an image provided on a film. The assembly includes a film transporting path having a window disposed therein for the delimitation of the edges of the image on the film and for defining the position of the film, the width of the opening of the window transverse to the direction of the film transporting path being smaller than the width of the film transporting path. The film guide assembly further includes first and second frame members which are arranged one behind the other in the direction of the travel of light through the window and enclose between them the film transporting path. The first frame member contacts the edges of the film and defines a contact plane which includes the window plane determinative for the sharpness of the projected image. The second frame member has a projection which projects in the direction of the contact plane defined by the first frame member.
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patent: 3627411 (1971-12-01), Nagel
patent: 3823891 (1974-07-01), Schrader
patent: 4257695 (1981-03-01), Longworthy
patent: 4258987 (1981-03-01), Nishikawa et al.
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