Selectively positionable slide tray position sensing arrangement

Details Selectively positionable slide tray position sensing arrangement Selectively positionable slide tray position sensing arrangement

1981-12-31

1983-12-13

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

353103, 353117, G03B 2304

Patent

active

044202326

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 position tray. Each of the apertures in the second array corresponds to a controlled slide position of a second tray type; e.g., a 140 slide position tray. The slide tray position sensing arrangement is responsive to a predetermined portion of a 140 slide position tray to selectively condition the position sensing arrangement to a second detection position in alignment with the path of travel of the second aperture array. The first detection position of the position sensing arrangement is aligned with the first aperture array for 80 slide position tray operation.

REFERENCES:
patent: 3178998 (1965-04-01), King
patent: 3895864 (1975-07-01), Uchidoi et al.
patent: 4041457 (1977-08-01), Koch
patent: 4240066 (1980-12-01), Lenox
patent: 4353642 (1982-10-01), Weigert
patent: 4358753 (1982-11-01), Cascini

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