Absolute encoder generating phase-shifted triangular waveforms t

Details Absolute encoder generating phase-shifted triangular waveforms t Absolute encoder generating phase-shifted triangular waveforms t

1995-03-13

1997-12-16

Gaffin, Jeffrey A.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 1, H03M 122

Patent

active

056990588

ABSTRACT:
An absolute encoder is provided with a movable member, which may be a disc, a photodetector and a processing circuit. The movable member has a plurality of tracks T arranged from higher to lower orders, each track having a bright and dark pattern. The photodetectors A1-A4 receive a light through the bright and dark patterns to output triangular detection signals A1-A4 associated with the track T. The processing circuit processes the detection signals A1-A4 to produce bit signals P1-P3 which indicate a position of the movable member. The processing circuit is provided with an input unit 1, a comparator unit 2 and a logic unit 3. The input unit 1 receives the detection signals A1-A4 for producing a plurality of triangular wave signals having the same period but different phases. The comparator unit 2 comparatively processes the triangular wave signals with each other to produce a plurality of rectangular wave signals having different phases. The logic unit 3 logically processes the rectangular wave signals with each other to output at least three bit signals P1-P3 from one track.

REFERENCES:
patent: 3487400 (1969-12-01), Ludewig, Jr. et al.
patent: 4465373 (1984-08-01), Tamaki et al.
patent: 4524347 (1985-06-01), Rogers
patent: 4623831 (1986-11-01), Sakamoto et al.
patent: 4870559 (1989-09-01), Hyatt
patent: 4893121 (1990-01-01), Gasiunas
patent: 4942394 (1990-07-01), Gasiunas
patent: 4970511 (1990-11-01), Mills
patent: 4978654 (1990-12-01), Koike
patent: 5068529 (1991-11-01), Ohno et al.
patent: 5438193 (1995-08-01), Takagi et al.
IBM Technical Disclosure Bulletin vol. 14 No. 3 p. 734, Aug. 1971.

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