| 摘要 |
A rotation detector has a rotation disc which is rotatably held on a rotation shaft, a plurality of teeth which are arranged on a surface of the rotation disc along an external periphery thereof, and at least one reflective photocoupler which is positioned slightly away from a surface of the rotation disc and opposed to the teeth. Light is emitted from the reflective photocoupler and impinges on the teeth of the rotation disc 1. The incident light is reflected by the teeth, and impinges on the reflective photocoupler. This rotation detector detects the rotation angle and rotation speed of the rotation disc, based on the receiver's optical outputs. Provision of a second reflective photocoupler enables the device to detect the direction of rotation.
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