Magnetic encoder using a displacement detecting circuit thereof

Details Magnetic encoder using a displacement detecting circuit thereof Magnetic encoder using a displacement detecting circuit thereof

1997-10-27

1999-09-07

Lee, Michael G.

Registers

Coded record sensors

Particular sensor structure

235439, 235450, 235493, 902 27, G06K 708

Patent

active

059490519

ABSTRACT:
A magnetic encoder that allows the power consumption to be reduced has a first member 1 magnetized at pitches .lambda. and a second member 2 disposed so as to be relatively movable to the first member 1. The second member 2 has at least four MR devices Ma1, Mb1, Ma2, and Mb2 with phases that differ from by .lambda./4 each. The MR devices Ma1, Mb1, Ma2, and Mb2 are connected as a bridge circuit. Thus, a displacement detecting circuit 30 that outputs two-phase sine wave signals INA and INB is structured. The detecting circuit 30 is intermittently activated by analog switches Sa1, Sb1, Sa2, and Sb2 driven by a first clock CK1. The output signals INA and INB of the detecting circuit 30 are sampled by sample hold circuits 41a and 41b, respectively. The sampled values are compared by comparators 42a and 42b, whereby binary data is obtained. The comparators 42a and 42b each have a bias circuit 44 that is intermittently driven by a second clock CK2.

REFERENCES:
patent: 4418372 (1983-11-01), Hayashida
patent: 4490674 (1984-12-01), Ito
patent: 4845456 (1989-07-01), Abe et al.
patent: 4968864 (1990-11-01), Doi et al.
patent: 5036276 (1991-07-01), Aizawa
patent: 5036319 (1991-07-01), Shiraki et al.
patent: 5057678 (1991-10-01), Ichikawa
patent: 5179475 (1993-01-01), McClure
patent: 5272573 (1993-12-01), McClure
patent: 5289122 (1994-02-01), Shigeno
patent: 5325056 (1994-06-01), Shonowaki et al.
patent: 5448419 (1995-09-01), Bigelow et al.
patent: 5451759 (1995-09-01), Hoshino et al.
patent: 5821517 (1998-10-01), Fedeli et al.
patent: 5889403 (1999-03-01), Kawase

Affiliated with

Also associated with

Rating

Magnetic encoder using a displacement detecting circuit thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic encoder using a displacement detecting circuit thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic encoder using a displacement detecting circuit thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1806494