Device for detecting the relative and absolute position of a mov

Details Device for detecting the relative and absolute position of a mov Device for detecting the relative and absolute position of a mov

1982-10-04

1986-07-08

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Displacement

324252, 338 32R, G01B 714, H01L 4308

Patent

active

045995613

ABSTRACT:
An encoder with a position detecting device is disclosed which is applicable to a brushless motor or the like, and includes a rotating body provided on a surface thereof with a magnetic material and magnetoresistive elements disposed opposite to and in close proximity to said magnetic material. The rotating body is provided with an encoding track in which a magnetic signal has been recorded in a predetermined direction of magnetization, and a position detecting track in which a magnetic signal has been recorded in a direction of magnetization intersecting with the predetermined direction of magnetization. The magnetoresistive elements are formed on an insulating substrate and face the tracks. Further, the magnetoresistive elements are arranged side by side in a radial direction of the rotating body and each of the magnetoresistive elements is placed so that the magnetoresistive element intersects the direction of magnetization in a track facing the magnetoresistive element, to make small the magnetoresistive element supporting substrate, thereby making the whole of the encoder small in size, and to prevent magnetic interference between the encoding track and position detecting track, thereby enhancing the performance of the encoder with the position detecting device.

REFERENCES:
patent: 4053826 (1977-10-01), Wasawa et al.
patent: 4274053 (1981-06-01), Ito et al.

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