Magnetic encoder

Details Magnetic encoder Magnetic encoder

2011-01-25

2011-01-25

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207250, C324S252000

Reexamination Certificate

active

07876091

ABSTRACT:
A magnetic encoder is provided, in which a large output voltage (a large amplitude) is obtained so that the magnetic encoder can have a strong resistance to external noise and so that malfunction can be prevented.Each of first to fourth magnetoresistance elements A1, A2, A3, and A4has at least a pinned layer, and a free layer in which an internal magnetization direction changes in accordance with external magnetic fields emitted by a magnetic body11. A magnetization direction α of the pinned layer is set to be in a first direction (a direction Z2) that is parallel to an outer peripheral side surface11A and that is perpendicular to rotation directions ra1-ra2, or is set to be in a second direction (a direction Z1) that is opposite to the first direction. Additionally, an initial magnetization direction β of the free layer is set to be in the first direction (the direction Z2) or the second direction (the direction Z1). When a pitch of N and S poles adjacent to one another in the rotation direction is denoted by λ, a pitch of the magnetoresistance elements A1, A2, A3, and A4is set to a pitch of λ/2.

REFERENCES:
patent: 4845456 (1989-07-01), Abe et al.
patent: 6452382 (2002-09-01), Tokunaga et al.
patent: 2003/0137381 (2003-07-01), Toyoda et al.
patent: 59-146720 (1984-10-01), None
International Search Report Issued in corresponding PCT Application No. PCT/JP2007/051348; mailed Apr. 3, 2007.

Affiliated with

Also associated with

Rating

Magnetic encoder 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic encoder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2722660