Diffraction-type optical encoder with improved detection signal

Details Diffraction-type optical encoder with improved detection signal Diffraction-type optical encoder with improved detection signal

1990-03-08

1991-01-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049856235

ABSTRACT:
In an optical encoder using a collimated lighting system, an index scale is inclined toward a main scale by a predetermined value. With this arrangement, a component of variation in the detection signal due to variations in the grating gap can be offset or integrated to be removed from a geometric image of the first grating in the detection signal, whereby the dependence of an S/N ratio of the detection signal on the grating gap can be avoided.

REFERENCES:
patent: 3768911 (1973-10-01), Erickson
patent: 3833807 (1974-09-01), Takeda
patent: 4529964 (1985-07-01), Minami et al.

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