Position encoder using a laser scan beam

Details Position encoder using a laser scan beam Position encoder using a laser scan beam

1986-02-14

1988-03-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01D 536, G11B 700

Patent

active

047330694

ABSTRACT:
Known absolute type position encoders have poor resolution due to bits density of tracks formed on an encoding member and mechanical size of sensors opposed to the encoding member for reading absolute position data from the tracks. This invention provides a position encoder comprising a laser scanning type encoding member on which data tracks aligned at equal intervals in a moving direction of a part to be position-measured. A sensor with a single laser beam deflectable along the track is used for reading the position data. High resolution is obtained since it depends upon recorded pitch of tracks. Many data can be recorded on each track, including error correction code for the position code. It improves reliability of the encoder.

REFERENCES:
patent: 4110610 (1978-08-01), Mueller et al.
patent: 4602242 (1986-07-01), Kimura

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