Rotation angle detecting device

Details Rotation angle detecting device Rotation angle detecting device

Filed on

2006-07-18

Date issued

2006-07-18

Examiner

LeDynh, Bot (Department: 2862)

Patent Class

Electricity: measuring and testing

SubClass

Magnetic

SubSubClass

Displacement

Other Related Categories

C324S244000

Type

Reexamination Certificate

Status

active

Patent number

07078893

Description

ABSTRACT:
A rotation angle detecting device includes a magnet (4), a magnetic substance unit (5), and a non-contact magnetic detection element (7). The magnet (4) rotates with an object to be measured and includes two ends magnetized so as to have opposite polarities. The magnetic substance unit (5) forms a predetermined air gap with the two ends of the magnet (4) and is divided into magnetic members (6) so as to provide plane symmetry with respect to a vertical plane perpendicularly crossing a rotational center axis of the magnet (4) to form a magnetic detection gap (9) by the division. The non-contact magnetic detection element (7) is provided in the magnetic detection gap (9) between the magnetic members (6) so as to output a signal corresponding to a density of a magnetic flux passing through the magnetic detection gap (9). The rotation angle of the object to be measured is detected based on the output signal from the magnetic detection element (7). The magnetic members (6) include reverse warp parts (34) so that the air gap suddenly increases when the magnet (4) rotates at a predetermined rotation angle from a state where the air gap is minimum in a direction in which the air gap increases.

REFERENCES:
patent: 5164668 (1992-11-01), Alfors
patent: 5670875 (1997-09-01), Alfors et al.
patent: 5694039 (1997-12-01), Alfors
patent: 6232771 (2001-05-01), Herden et al.
patent: 6593734 (2003-07-01), Gandel et al.
patent: 6703827 (2004-03-01), Wolf et al.
patent: 6707292 (2004-03-01), Viola
patent: 2004/0251893 (2004-12-01), Takahara

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