Rotation angle detecting apparatus and its rotary disc

Details Rotation angle detecting apparatus and its rotary disc Rotation angle detecting apparatus and its rotary disc

2005-06-07

2005-06-07

Gutierrez, Diego (Department: 2859)

Geometrical instruments

Distance measuring

Error compensation

C033S0010PT, C033S706000

Reexamination Certificate

active

06901682

ABSTRACT:
A rotary disc made of synthetic resin has a fixed portion fixed to a rotary shaft, a cylindrical portion extending in the thrust direction from the outer peripheral edge of the fixed portion, and a disc main body portion extending in the radial direction from the lower portion of the cylindrical portion, and a scale portion for detecting the rotation angle is disposed on the underside of the disc main body portion. Among the coefficient of thermal expansion α1of the rotary disc, the coefficient of thermal expansionα2of the rotary shaft, the temperature characteristic factor β of a sensor head, the distance H between a mounting reference surface and the light condensing point of the sensor head in the thrust direction, the distance L from the fixed point of the rotary shaft and a bearing to the fixed point of the rotary shaft and the rotary disc in the thrust direction, the distance S between the fixed point and the scale portion for rotation angle detection in the thrust direction, and the amount of change ΔT of temperature, a relational expression β×H×ΔT=(α2×L+α1×S)×ΔT and a relational expression L=H+S are established to thereby construct a rotation angle detecting apparatus which is hardly affected by any temperature change.

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