Sprocket hole sensing detector for moving translucent paper shee

Details Sprocket hole sensing detector for moving translucent paper shee Sprocket hole sensing detector for moving translucent paper shee

1979-12-28

1981-10-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235458, G06K 714

Patent

active

042963320

ABSTRACT:
A light emitting source and a light sensing device are permanently fixed on one side of a moving object substantially separated one from the other. The light rays from the source are bent or reflected in a predetermined path so that the light rays to be sensed passes through at least two holes in said moving object before being sensed, thus enhancing the light to dark ratio and reducing the probability of false readings.

REFERENCES:
patent: 2448830 (1948-09-01), Robbins et al.
patent: 3244895 (1966-04-01), Anderegg, Jr.
patent: 3742486 (1973-06-01), Skidmore
patent: 4143268 (1979-03-01), Marold et al.

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