Encoder for detecting relative displacement having first and sec

Details Encoder for detecting relative displacement having first and sec Encoder for detecting relative displacement having first and sec

1991-09-27

1992-06-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

051245485

ABSTRACT:
An encoder is provided with a light emitting device for emitting irradiating light, a first scale on which a substantially light transmitting portion and light shielding portion are periodically provided, a second scale which is adapted to be displaced relatively to the first scale and on which V-shape groove and light transmission plane portions are periodically provided at a first surface facing the first scale, a light receiving device, arranged to face a second surface of the second scale, for receiving light having passed through the first and second scales and a detecting device for detecting the relative displacement of the two scales based on the output signals from the light receiving device.

REFERENCES:
patent: 3598493 (1971-08-01), Fisher
patent: 3856401 (1974-12-01), Heitmann et al.

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