Non-contact type mode sensing device for use in an electric appl

Details Non-contact type mode sensing device for use in an electric appl Non-contact type mode sensing device for use in an electric appl

1997-04-22

1999-05-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

059006269

ABSTRACT:
There is disclosed a non-contact type mode sensing device for use in an electric appliance. The mode sensing device comprises a stationary body, a driven gear rotatably fixed on the pin of the stationary body, and an optical coupler having a light emitter and a light receiver. The driven gear is provided with a circular reflective track formed on the bottom surface thereof. A plurality of reflective portions are formed, along a circular track, on a bottom surface of the driven gear. The reflective portions have different arcuate lengths from one another. The light beam emitted by the emitter of the optical coupler is reflected by the reflective portions and received at the receiver during the rotation of the driven gear, thereby allowing the optical coupler to produce signals in response to the presence or absence of the light reflected by the reflective portions.

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