Optical type encoder

Details Optical type encoder Optical type encoder

1989-05-03

1991-03-19

Arnold, Bruce Y.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350286, 250237G, 356356, 356354, G02B 2702

Patent

active

050005421

ABSTRACT:
In an optical type encoder for projecting a light beam onto an optical type scale having a diffraction grating formed thereon, forming an interferenced light by the use of a diffracted light from the scale, and photoelectrically converting the interferenced light to thereby measure the displacement of the scale, first and second light beams are caused to enter substantially the same position on the scale from different first and second directions, first and second diffracted light beams emerging from the scale by the first and second light beams being diffracted by the scale are directed to the aforementioned position by a reflecting device, the diffracted light beams emerging in the first and second directions by the first and second diffracted light beams being diffracted by the scale are superposed one upon the other to thereby form an interferenced light, and light components created by the first and second light beams being regularly reflected at the aforementioned position are not included in the interferenced light.

REFERENCES:
patent: 3726595 (1973-04-01), Matsumoto
patent: 3738753 (1973-06-01), Huntley, Jr.
patent: 3756723 (1973-09-01), Hock
patent: 4465366 (1984-08-01), Schmidt
patent: 4596467 (1986-06-01), Bartelt
patent: 4629886 (1986-12-01), Akiyama et al.
patent: 4676645 (1987-06-01), Taniguchi et al.
patent: 4930895 (1990-06-01), Nishimura et al.

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