Absolute value encoder and an output correction method of absolu

Details Absolute value encoder and an output correction method of absolu Absolute value encoder and an output correction method of absolu

1994-03-29

1995-04-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250205, G01D 534

Patent

active

054060770

ABSTRACT:
The position of a machine tool or the like is accurately obtained by an absolute value encoder. Light emission elements emit light which passes through scales containing optical patterns and is detected by light receiving elements. First, a signal detected by the light receiving elements while the light emission elements are extinguished is stored in memory. Then, the light emission elements are lighted and the signal detected by the light receiving elements is corrected by the previously stored signal.

REFERENCES:
patent: 5073711 (1991-12-01), Brininstool et al.
patent: 5241172 (1993-08-01), Lugaresi

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