Combination optical and capacitive absolute position apparatus a

Details Combination optical and capacitive absolute position apparatus a Combination optical and capacitive absolute position apparatus a

1991-02-26

1993-07-06

Logan, Sharon D.

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 15, 341 9, 33706, H03M 122

Patent

active

052258300

ABSTRACT:
A combined optical and capacitive absolute positioning encoding system uses a plurality of metallized strips deposited onto a glass scale substrate. A movable transceiver is positioned adjacent to the scale. The transceiver generates interrogating electrical an optical signals which interact with the scale. The movable transceiver also carries with it receiver mechanisms for receiving the signals after interaction with the scale. Signal processing electronics are provided to determine the relative positions of the scale and transceiver by comparing the transmitted, interrogating signals with the received signals. The system is able to determine the relative positions of the scale and transceiver even if power to the system is interrupted, or if the scale and transceiver are moved relative to one another very rapidly.

REFERENCES:
patent: 3812352 (1974-05-01), MaGovern
patent: 4152837 (1979-05-01), Nelle et al.
patent: 4218615 (1980-08-01), Zinn, Jr.
patent: 5062214 (1991-11-01), Gustafsson et al.

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