G - Physics – 02 – B
Patent
G - Physics
02
B
88/1, 96/234, 88
G02B 27/02 (2006.01) G02B 27/22 (2006.01)
Patent
CA 1063847
ABSTRACT OF THE DISCLOSURE The disclosure relates to a viewer for a stereoscopic filmstrip having a plurality of spaced perforations along one longitudinal margin and including a series of pairs of left and right hand stereoscopic frames. The viewer includes a casing for receiving the filmstrip and the casing includes a front wall, a rear wall, and a top wall. A pair of lenses are mounted in positions spaced transversely of the front wall for use in viewing the filmstrip. Film masking means are disposed inside the casing at a position spaced from and generally parallel to said front wall. The masking means defines a pair of apertures positioned to permit viewing of the respective left and right hand frames of successive frame pairs as the filmstrip is advanced through the viewer in use. Means are provided for guiding the filmstrip in a path which extends trans- versely of the casing rearwardly of the masking means. The viewer also includes a film transport mechanism disposed inside the casing and positioned laterally of said apertures in the masking means. The transport mechanism includes a film-engaging disc which is turnable about an axis normal to the direction of filmstrip movement and which has a peripheral series of teeth for engagement in said perforations in the filmstrip so that turning of the disc advances the filmstrip past said apertures. A drive member is pro- vided for turning the disc and is itself turnable about an axis parallel to the turning axis of the disc. The drive member includes an operating lever which projects to the exterior of the casing for turning the member and which is movable from a rest position to a fully advanced position. The drive member is biassed to normally maintain the operating lever in said rest position. Ratchet means couple the drive member and disc so that movement of the operating lever from said rest position to said fully advanced position causes the disc to turn and advance the filmstrip uni- directionally by an amount equal to the spacing between successive pairs of films on said filmstrip. Detent means cooperate with said disc for preventing return movement of the disc in a direction counter to the film advance direction upon release of the operating lever. The viewer also includes means for illuminating the filmstrip. The illuminating means are defined by at least one light admitting aperture in the top wall of the casing, the aperture being positioned rearwardly of said masking means. Reflector means are arranged in an angular position at the rear of the film path for reflecting incoming light through the apertures in the masking means to illuminate the filmstrip.
253820
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