Optical media monitoring device

Details Optical media monitoring device Optical media monitoring device

1987-02-20

1988-11-15

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340514, 356438, G08B 2100

Patent

active

047852950

ABSTRACT:
In an optical media monitoring device that detects presence of light-interrupting media between a photoemitter component and a photoreceptor component provided to operate in cooperation with each other, the photoemitter component is driven at a variable level of light emission, and a comparator compares the output of the photoreceptor component with a reference signal which is also variable. The driving means is controlled to cause the photoemitter component to emit a level of light lower than normally used for media detection. Dust degradation of the sensor is determined by checking, in a state of no media present and the reduced light emission of the photoemitter component, whether the output of the photoreceptor component is greater than the reference signal level.

REFERENCES:
patent: 4097732 (1978-06-01), Krause et al.
patent: 4363032 (1982-12-01), Kimoto
patent: 4670647 (1987-06-01), Hubble, III et al.

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