Device including an even number of equally spaced magneto-resist

Details Device including an even number of equally spaced magneto-resist Device including an even number of equally spaced magneto-resist

1992-12-28

1994-07-05

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324173, 32420725, G01P 3488, G01P 350, G01B 714, G01D 514

Patent

active

053270770

ABSTRACT:
A movement detector device consumes less power and provides a high detection reliability. The teeth on a rotating gear are magnetically detected. There are a number of interconnected magneto-resistors MR1 through MRi connected in series, with the series circuit connected between a power supply line and a ground line. There are output signal pickup points P1 through P7 at the connections between the adjacent magneto-resistors. Signals outputted from these signal pickup points P1 through P7 are shifted in their phases by 1/2period with respect to each other. These signals are paired, and each of the paired signals is fed to a differential amplifier circuit to provide signals E1 through E4 as detection signals. In another embodiments, a linear member has a number of magnetic spots which may be detected in the same manner that the gear teeth are detected.

REFERENCES:
patent: 4612502 (1986-09-01), Spies
patent: 4806860 (1989-02-01), Iijima et al.
patent: 5047716 (1991-09-01), Katagiri

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