Multiple image projection device

Details Multiple image projection device Multiple image projection device

1976-09-27

1978-11-07

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

353108, G03B 2310

Patent

active

041242840

ABSTRACT:
A projection device for selectively projecting one of a large number of images. A stepper motor operatively positions a selected transparency on a cartridge, containing a plurality of transparencies, within a projection system for illumination and projection of the image from the transparency onto a viewing screen. Apparatus is provided for automatically identifying the transparency cartridge which is being controlled by the stepper motor and for determining a homing position. The stepper motor always returns the cartridge to a starting or home position before moving the number of steps required to locate the selected transparency within the projection system.

REFERENCES:
patent: 1166384 (1915-12-01), Partridge et al.
patent: 3296727 (1967-01-01), Liguori
patent: 3704451 (1972-11-01), Pearson
patent: 3712723 (1973-01-01), Gerry
patent: 3865479 (1975-02-01), Frye et al.

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