Device for detecting light transmissivity of detected object and

Details Device for detecting light transmissivity of detected object and Device for detecting light transmissivity of detected object and

1989-05-22

1990-02-27

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 71, G11B 1548

Patent

active

049051067

ABSTRACT:
A device for detecting the light transmissivity of an object to be detected comprises a light emitting element and a light receiving element which are opposed to each other across the detected object. The device is arranged to cause the light emitting element to intermittently emit a light and to detect the light transmissivity of said detected object on the basis of a detection signal obtained from the light receiving element when the light is emitted by the light emitting element and another detection signal obtained from the light receiving element when no light is emitted by the light emitting element.

REFERENCES:
patent: 4570075 (1986-02-01), Spiero
patent: 4570876 (1986-02-01), Andoh et al.

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