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Linear encoder

Encoders provide a measurement of the position of a component in a system relative to some predetermined reference point. A linear encoder measures the distance between the present position of a moveable carriage and a reference position that is fixed with respect to the moveable carriage as the moveable carriage moves along a predetermined path. Various types of linear encoders are used as high-precision position detection means for precisely detecting the position of, e.g., a carriage that reciprocally moves in a recording apparatus. In general, the linear encoders of an optical type and a magnetic type have been used to detect the linear positions of a machine tool part. The optical encoder is of a non-contact type with high accuracy and high resolution, and is utilized in various fields because it is superior in electro-magnetic radiation resistance. In particular, in encoders requiring high accuracy/high resolution, the optical type forms the mainstream. The optical encoder generally comprises a scale fixed to a displacement measurement target on a stage or the like, and a sensor head for detecting a displacement of the scale. The sensor head includes a light source portion, which emits light onto the scale, and a light detection portion for detecting the light that has passed through the scale.

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