Image projecting apparatus with margin detect means

Details Image projecting apparatus with margin detect means Image projecting apparatus with margin detect means

1989-05-01

1990-02-20

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

353 26A, 355 45, G03B 2752, G03B 1328, G03B 2312

Patent

active

049030736

ABSTRACT:
An image projecting apparatus using a microfilm strip carrying a series of image frames which have a margin area between adjacent two thereof, comprising a viewing screen for displaying an image reproduced from the microfilm strip, reels and motors for driving the microfilm strip to travel along a predetermined path, an optical system for irradiating the microfilm strip with a beam of light, the beam of light being transmitted as an information-carrying beam of light carrying image information detected from the microfilm strip, a projection lens for magnifying the information-carrying light beam and projecting the magnified beam of light onto the viewing screen, a photoelectric margin sensor responsive to at least a portion of the information-carrying light beam for producing an electric signal variable with the quantity of light incident on the photoelectric margin sensor, the photoelectric margin sensor being located off the location at which the information-carrying light beam is to be focussed by the projection lens, and a control circuit responsive to the electric signal from the photoelectric margin sensor for detecting the margin area intervening between any adjacent two of the image frames of the microfilm strip and thereby controlling the reels and motors.

REFERENCES:
patent: 3740136 (1973-06-01), Maloney et al.
patent: 4435076 (1984-03-01), Tatsunosuke
patent: 4453823 (1984-06-01), Sugita et al.
patent: 4660965 (1987-04-01), Matsumoto
patent: 4693591 (1987-09-01), Saijo et al.
patent: 4745489 (1988-05-01), Kashiwagi et al.

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