Patent ID: 11858132
Assignee: NIKON CORPORATION
Field: Measurement (Instruments)
Classification: CPC B  G  H | IPC B  G

Claim 0:
1. An encoder device comprising:
a position detection unit for detecting position information of a moving part;
a magnet having a plurality of polarities along a moving direction of the moving part; and
an electric signal generation circuit generating an electric signal, based on a magnetic characteristic of a magnetosensitive wire, the electric signal generation circuit having the magnetosensitive wire whose magnetic characteristic is changed by a change in magnetic field associated with relative movement to the magnet, wherein
the magnetosensitive wire is disposed so that the magnetosensitive wire is spaced apart from a side surface of the magnet in a direction orthogonal to the moving direction and a length direction of the magnetosensitive wire is orthogonal to tangential directions of at least some of magnetic field lines of the magnet.