Absolute linear encoder and method of production utilizing index

Details Absolute linear encoder and method of production utilizing index Absolute linear encoder and method of production utilizing index

1997-02-05

1998-10-20

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 2, 341 9, 341 11, H03M 122

Patent

active

058253076

ABSTRACT:
An absolute linear encoder includes an index channel and at least two counter channels. The spacing between markings on the index channel is constant, and the spacing between markings on the first and second channels is predetermined so that the positions of the markings in the first and second channels vary so as to provide a unique signature for each position along the encoder. The linear encoder includes quadrature channels to provide increased resolution and to determine the direction of translation. The encoder is provided with a detector unit to detect positions of the markings in each channel, and a processing unit to calculate an absolute position from the detected marking positions. A method of producing the absolute linear encoder includes selecting spacings for markers in the quadrature, index, first and second channels in order to provide a desired resolution and encoder length.

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