Absolute multi-revolution encoder

Details Absolute multi-revolution encoder Absolute multi-revolution encoder

2005-05-11

2009-12-22

Whittington, Kenneth J (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207210

Reexamination Certificate

active

07635975

ABSTRACT:
Magnetic field detection elements and detect a magnetic material member formed at a rotary disc. An A pulse generation portion and a B pulse generation portion generate an A pulse a and a B pulse b which phases differ by 90 degrees to each other. The B pulse generation portion is supplied with the power from a backup power supply for a predetermined time period necessary for detecting the level of the B pulse from a time point of the edge of the A pulse.

REFERENCES:
patent: 5-079853 (1993-03-01), None
patent: 6-18281 (1994-01-01), None
patent: 6-062322 (1994-09-01), None
patent: 9-273943 (1997-10-01), None
Chinese Office Action dated Mar. 21, 2008.

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