Optics: image projectors – Miscellaneous
Patent
1978-01-09
1979-09-25
Aegerter, Richard E.
Optics: image projectors
Miscellaneous
242 5519A, 352 78R, 352126, 350241, G03B 2100, G02B 2700
Patent
active
041688880
ABSTRACT:
A film cassette for containing and displaying an endless loop of film has a housing constructed of two symmetrical elements, an end of the housing being deeper to accommodate a larger portion of the film. Apertures are formed in opposing sides of the housing and extend the full width of each side or approximately twice the width of a frame of film. A dual film gate assembly is contained within the housing and has two back plates to support the film and two snap on front plates which define a film gate on either side through which a leader of film is threaded. Both the back plates and the front plates have openings which approximate the size of a frame of film to allow light to pass from one aperture to the other in a straight line path. A film advancing means consists generally of a shaft having two sprockets mounted thereon, each sprocket extending through an index slot in a film guide plate and having teeth or other structure to positively engage the film and advance it through the film slot. The double sprockets operate to push and pull the film through the dual film gate and maintain the relative spacing between ends of the film. The film is presented in a direct view mode and a project mode simultaneously on opposite sides of the dual film gate assembly and is advanced simultaneously by the double sprocket film advancing means. Windows may be provided to seal the apertures to prevent contamination from entering the cassette. In an alternate embodiment, the apertures extend only halfway across the sides of the housing or approximately one full width of a frame of film. The film is threaded through similar internal structure but is displayed at only one aperture. In this mode, the cassette may be used for direct viewing in one orientation and turned upside down to achieve the proper film juxtaposition for projecting. Either a double or single sprocket drive may be provided in this embodiment. A direct viewer attachment may be provided and is pivotable from a stored position to an operating position. The direct viewer attachment has a small optical element which is positioned to align with the direct view display of the cassette. A snap on light unit may be provided for attaching to one side of the cassette to provide light for direct view operation.
REFERENCES:
patent: 1411008 (1922-03-01), Fiske
patent: 2275863 (1942-03-01), Rauch
patent: 2495047 (1950-01-01), Afton et al.
patent: 3446551 (1969-05-01), Platt
patent: 3697159 (1972-10-01), Fernkopf
patent: 4073581 (1978-02-01), Rayburn
Kiehl Paul G.
Pierson George R.
Aegerter Richard E.
Shepperd John W.
Visual Data Corporation
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