Encoder for measuring both incremental and absolute positions of

Details Encoder for measuring both incremental and absolute positions of Encoder for measuring both incremental and absolute positions of

1988-03-08

1990-04-03

Shoop, Jr., William M.

Coded data generation or conversion

Digital pattern reading type converter

Plural types of codes on single carrier

341 11, 341 13, 25023118, H03M 122

Patent

active

049144375

ABSTRACT:
An optical encoding system for determing the absolute and the incremental positions of a movable member relative to a stationary member. For example, three stationary light sources may be supported by the stationary member for emitting three narrow light beams on respective paths. An encoding band may be supported by the movable member in the paths of the light beams. The band has a timing and incremental encoding track comprising at least one series of alternating light-blocking stripes and light-passing stripes, and a data track comprising a series of distinct absolute position tags. A read head may be supported by the stationary member and has three optical sensors, one for each light beam, two preferably in quadrature with each other for the timing and incremental encoding track, and one for the data track. Each optical sensor includes light sensors for generating an analog signal voltage. A decoding system actuated by these analog signal voltages determines the incremental and absolute position of the movable member relative to the stationary member.

REFERENCES:
patent: 4628298 (1986-12-01), Hafle et al.
patent: 4736187 (1988-04-01), Kibrick et al.

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