Position detector and positioning device
AssigneeKonica Minolta Opto, Inc.
InventorTakayuki Hoshino
Life of this patent
Estimating the term…
Abstract
A position detector (3) capable of obtaining an output having a linearity in a wide range includes: a magnetic field generating member (11) attached to a movable member (10) movable in a predetermined movable direction (x); and magnetic field detection means (12) for detecting a magnetic field change caused by movement of the magnetic field generating member (11). The magnetic field generating member (11) includes an N-pole portion (13) magnetized into N-pole, an S-pole portion (14) magnetized into S-pole arranged in the movable direction with the N-pole portion (13), and a non-magnetized portion (15) not magnetized between the N-pole portion (13) and the S-pole portion (14).
Claims16
A position detector, comprising:
- a magnetic field generating member comprising an N-pole portion magnetized to be north pole;
- an S-pole portion magnetized to be south pole located side by side with the N-pole portion in a movable direction;
- and a non-magnetized portion which is not magnetized and which is located between the N-pole portion and the S-pole portion, and attached to a movable member movable in the movable direction;
- a magnetic field detector having two magnetic field detecting elements juxtaposed in the movable direction for detecting a change of magnetic field caused by movement of the magnetic field generating member;
- and
- an operation device which carries out an operation of:
- (A−B)/(A+B)+2 if A>0;
- (A−B)/(A+B)−2 if B<0;
- and
- (B+A)/(B−A) if A≦0 and B≧0,
- wherein A represents a smaller detection signal and B represents a larger detection signal in a linear range, out of detection signals by the two magnetic field detecting elements.
A position detector, comprising:
- a magnetic field generating member attached to a movable member movable in a predetermined movable direction;
- and
- a magnetic field detector detecting a change of magnetic field caused by movement of the magnetic field generating member,
- wherein the magnetic field detector has two magnetic field detecting elements juxtaposed in the movable direction for detecting a change of magnetic field,
- the position detector further comprising an operation device for carrying out operations of:
- (A−B)/(A+B)+2 if A>0;
- (A−B)/(A+B)−2 if B<0;
- and
- (B+A)/(B−A) if A≦0 and B≧0,
- wherein A represents a smaller detection signal and B represents a larger detection signal in a linear range, out of detection signals by the two magnetic field detecting elements.
Dependencies are inferred from the claim text.