Encoder for measuring the absolute position of moving elements

Details Encoder for measuring the absolute position of moving elements Encoder for measuring the absolute position of moving elements

1988-03-30

1990-02-13

Shoop, Jr., William M.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 3, H03M 122

Patent

active

049010735

ABSTRACT:
An optical encoding system for determining the absolute position of a movable member relative to a stationary member. For example, a bar-code scanner may be supported by a stationary member for scanning bar-code symbols in its field of view. An encoding band may be supported by the movable member so that a portion of the band is scanned by the bar-code scanner. Affixed to or otherwise marked on the band is a sequential series of bar-code symbols, each symbol encoding the absolute position of its location on the band. A bar-code decoding system, actuated by the signals produced by the bar-code scanner, decodes the bar-code symbol scanned by the scanner, and determines the absolute position of a movable member relative to the stationary member.

REFERENCES:
patent: 4074258 (1978-02-01), Dore et al.
patent: 4631519 (1986-12-01), Johnston
patent: 4633224 (1986-12-01), Gipp et al.
patent: 4720699 (1988-01-01), Smith
patent: 4736187 (1988-04-01), Kilbrick et al.

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