Rotation position detecting device

Details Rotation position detecting device Rotation position detecting device

2006-02-14

2006-02-14

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Incremental

C341S006000

Reexamination Certificate

active

06999006

ABSTRACT:
A rotation position detecting device includes an angular signal generator which generates pulses the cycle period of which is even or equal when a rotating object rotates at a constant rotation speed and a non-pulse portion which corresponds to a reference position, an up-down command circuit for generating an up-down command signal the frequency of which is divided to a half of the frequency of the angular signal, a pair of first counters for counting up or down the clock signal when the up-down command signal changes from a first level to a second level to reset and subsequently counting down the clock signal when the up-down command signal changes from the second level to the first level, a pair of processing circuits for providing a first and second reference values, a pair of counters which generates detection signals when the counted number of the counters becomes smaller than the first or the second reference value.

REFERENCES:
patent: 4085890 (1978-04-01), Kimura et al.
patent: 4604575 (1986-08-01), Shimizu et al.
patent: 5264844 (1993-11-01), Itou et al.
patent: 5493188 (1996-02-01), Yoshikawa et al.
patent: 6323876 (2001-11-01), Rao et al.

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