Optics: image projectors – Selective data retrieval
Patent
1981-12-31
1984-02-21
Haroian, Harry N.
Optics: image projectors
Selective data retrieval
353117, 353103, G03B 2304
Patent
active
044326181
ABSTRACT:
Control apparatus is provided for a slide projector to accurately control rotation of a slide tray to predetermined slide positions of the slide tray and to provide integrated control of the slide change function at each slide position. The control apparatus operates in a forced mode between slide positions and operates in a servo mode to accurately position the slide tray at each of the predetermined slide positions. The detection of the slide positions utilizes a circumferential, apertured ring carried on a movable turntable that also carries the slide tray; the ring including a single incremental position aperture corresponding to each of the slide positions. Dual photodetectors are positioned at a sensing station to sense the respective slide position apertures, to provide differential position feedback detection signals in a servo loop, to interrupt the forced mode of operation and for controlling the stopping and positioning of the slide tray to a selected slide position in the servo mode. The control apparatus is operable by a forward/reverse selector switch in a first manual arrangement. Further, the control apparatus is also operable to advance to successive slide positions in response to a control signal derived as a tape advance signal from a cassette tape at variable, preprogrammed intervals. A random access slide projector is provided in another arrangement with the control apparatus being actuated either by decoded slide addresses from a program tape, or by the direct input from a local or remote keyboard.
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
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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