Optics: image projectors – Selective data retrieval
Patent
1981-12-31
1984-04-03
Haroian, Harry N.
Optics: image projectors
Selective data retrieval
353103, 353117, G03B 2304
Patent
active
044404786
ABSTRACT:
A slide tray position sensing arrangement is provided for slide projector apparatus. The slide tray position sensing arrangement is arranged at a detection station. A coded aperture ring is provided that moves in a manner correlated to the movement of a slide tray turntable. The slide tray turntable carries the slide tray that holds the slides for projection and also functions as a tray transport arrangement. The coded aperture ring includes two circumferential arrays of apertures. Each of the apertures in the first array corresponds to a controlled slide position of a first tray type; e.g., an 80 slide tray. Each of the apertures in the second array corresponds to a controlled side position of a second tray type; e.g., a 140 slide tray. The slide tray position sensing arrangement is controllable to selectively sense the appropriate array of apertures corresponding to the slide tray type being utilized. In a first arrangement, the position sensing arrangement is selectively movable between two detection positions; each of the detection positions being aligned with a respective one of the aperture arrays. In a second arrangement, two detection arrangements are provided; each of the detection arrangements being aligned with a respective one of the aperture arrays.
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Mischenko Nicholas
Parker Robert R.
Starai Rudolph
Bell & Howell Company
Fitz-Gerald Roger M.
Haroian Harry N.
Lapacek James V.
Schneider Robert J.
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