Optical encoder

Details Optical encoder Optical encoder

1991-09-23

1993-01-05

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

051773562

ABSTRACT:
An optical encoder irradiating light emitted from a light emitting unit includes a rectangular collimator lens having a rectangular face onto a main scale which moves in the longitudinal direction, receives the collimated light beam passing the main scale in a light receiving unit, and optically reads the displacement of the main scale. Since the collimator lens is rectangular, the light emitting unit can be made compact without decreasing the irradiation area of a light beam which is effective in the detection of the displacement. Furthermore, it is possible to increase the irradiation area of the light beam by dividing a collimated light beam from the collimator lens into a plurality of diffracted light beams by a transmitting or reflecting diffracton grating.

REFERENCES:
patent: 2747797 (1956-05-01), Beaumont
patent: 4096383 (1978-06-01), Mancini et al.
patent: 4776701 (1988-10-01), Pettigrew

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