Displacement detector

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Patent

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Details

25023114, 250237G, 33707, 356144, 341 13, G01D 534, H03M 122

Patent

active

049911252

ABSTRACT:
An absolute position type of displacement detector employs multiple grating tracks. The pitches of the gratings in the respective tracks are set to be just slightly different so as to detect an absolute position from a small number of analog signals by a vernier. The number of tracks is set to be three or more so as to multiply the vernier, thereby enabling absolute position measurement in a wide measurement range.

REFERENCES:
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patent: 4602436 (1986-07-01), Ernst
patent: 4686362 (1987-08-01), Merlo
patent: 4733069 (1988-03-01), Narutaki
patent: 4736187 (1988-04-01), Kibrick et al.
patent: 4779211 (1988-10-01), March
patent: 4786891 (1988-11-01), Ueda et al.
patent: 4945231 (1990-07-01), Ohya et al.

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