Non-contacting rotary type mode switch for magnetic tape recordi

Details Non-contacting rotary type mode switch for magnetic tape recordi Non-contacting rotary type mode switch for magnetic tape recordi

1991-01-09

1991-10-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250237G, G01D 534

Patent

active

050618482

ABSTRACT:
A non-contacting rotary type mode switch for a magnetic tape recording device such as VCR, in which a plurality of reflector pieces are arranged on tracks of a plurality of concentric circles respectively on the rear surface of a mode switch gear, and a plurality of opto-reflection sensor units composed of a light emitter and light receiver for discriminating the presence or absence of the reflector pieces, arranged on the top surface of a switch body, so that the rotational mode of said cam gear, i.e. running state, such as play, review, normal or reverse speed winding, stop and the like can be read out. Since the non-contacting type system utilizing the reflector pieces and opto-reflection sensor units are employed instead of the conventional contacting type, various disadvantages such as mechanical abrasion, deformation, leakage of lubricating oil, and electric discharging are eliminated, and also the system can be miniaturized.

REFERENCES:
patent: 3307041 (1967-02-01), Kling
patent: 3598933 (1971-08-01), Walser
patent: 4031386 (1977-06-01), Recker
patent: 4053784 (1977-10-01), Kuze
patent: 4123653 (1978-10-01), Bovio
patent: 4634861 (1987-01-01), Ching
patent: 4788422 (1988-11-01), Fujiwara

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