Reflection-type optical encoder with light receiving array

Details Reflection-type optical encoder with light receiving array Reflection-type optical encoder with light receiving array

1997-01-21

1998-06-30

Nelms, David C.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, G01B 902

Patent

active

057742197

ABSTRACT:
A reflection-type main scale G1 is disposed on a first member 10. A diffused light source 40, a transmission-type light source index scale G2, and a photodiode array PDA are disposed on a second member 20. The diffused light source 40 irradiates the main scale G1 through the index scale G2 for generating a reflected image pattern. The photodiode array PDA detects the reflected image pattern obtained from the main scale G1. The photodiode array PDA and the index scale G2 are integrally united in such a manner that the receiving surface of the photodiode array PDA and the grating surface of the index scale G2 are aligned in a plane.

REFERENCES:
patent: 4051367 (1977-09-01), Sayce et al.
patent: 5067816 (1991-11-01), Ichikawa
patent: 5657125 (1997-08-01), Kato et al.

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