Coded data generation or conversion – Digital pattern reading type converter – Optical
Patent
1986-04-08
1988-11-22
Sloyan, T. J.
Coded data generation or conversion
Digital pattern reading type converter
Optical
250231SE, 33125A, H03M 122
Patent
active
047868910
ABSTRACT:
An encoder device of the absolute position type for outputting a shift position or angle of rotation relative to the absolute position. The device comprises a code plate having first and second grid patterns wherein information is stored as 1 or 0 in a periodic manner at pitches slightly different from each other; first and second sensory arrays for detecting the first and second grid patterns; driving means for driving the sensors relative to the grid patterns and for obtaining an alternating signal from each array; and computation means for measuring the phase angle of the alternating signal from each array, and the phase angle difference therebetween and for calculating the position using such phase angles. Advantageously, the invention is suitable for miniaturization due to its simplicity, relaibility, and efficiency.
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patent: 4251842 (1981-02-01), Iwasaki et al.
patent: 4504832 (1985-03-01), Conte
patent: 4529964 (1985-07-01), Minami et al.
patent: 4572952 (1986-02-01), March
Iino Toshio
Kohsaka Fusao
Nakayama Hiroshi
Ueda Toshitsugu
Kojima Moonray
Sloyan T. J.
Yokogawa Electric Corporation
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