Drive unit provided with position detecting device

Details Drive unit provided with position detecting device Drive unit provided with position detecting device

2008-01-01

2008-01-01

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207200, C356S614000

Reexamination Certificate

active

07315164

ABSTRACT:
A drive unit in accordance with the present invention is provided with a magnetic field generating member generating a magnetic field, a magnetic field detecting device constituted by first, second and third magnetic field detecting elements detecting the magnetic field, and a piezoelectric actuator moving the magnetic field generating member. When executing a relative positioning between the magnetic field generating member and the magnetic field detecting device on the basis of a detection result by the magnetic field detecting device, a first positioning is executed on the basis of the detection result of the first and second magnetic field detecting elements in a predetermined region, and a second positioning is executed on the basis of the detection result of the third magnetic field detecting element at a predetermined point apart from the predetermined region, within a movable range in which the magnetic field generating member moves. In accordance with the structure, it is possible to position the movable body at a high precision, even in the case that a plurality of position detecting points of the movable body of the drive unit exist at a wide interval.

REFERENCES:
patent: 4620253 (1986-10-01), Garwin et al.
patent: 5200776 (1993-04-01), Sakamoto
patent: 6498482 (2002-12-01), Schroeder
patent: 7088096 (2006-08-01), Etherington et al.
patent: 08-275496 (1996-10-01), None
patent: 2000-205809 (2000-07-01), None
patent: 2003-185406 (2003-07-01), None
patent: 2004-039068 (2004-02-01), None

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