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

1991-01-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049838253

ABSTRACT:
In a reflection type encoder having a main scale and an index scale with first and second gratings, respectively, and using a diffusing light source, diffused rays from a point light source are focused by a condensing lens to produce a secondary point light source positioned on a plane defined by the second gratings of the index scale. With this arrangement, a collimator lens can be dispensed with, so that the encoder can be rendered compact in size. Furthermore, the respective elements can be easily supported and positioned.

REFERENCES:
patent: 3768911 (1973-10-01), Erickson
patent: 4259964 (1985-07-01), Minami et al.
patent: 4479716 (1984-10-01), Nelle
patent: 4564294 (1986-01-01), Ernst

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