| 摘要 |
PURPOSE:To detect an object with a high accuracy, by checking a displacement point of the object utilizing the theory of a reflection mirror mounted on the object, a trigonometrical distance measuring system and a semiconductor position detecting element. CONSTITUTION:Light projecting and receiving lenses 3 and 3' having parallel optical axes l and l' are arranged side by side beforehand and when infrared rays are projected from a light emitting diode 1, the infrared rays are made incident as a light spot S with a reflection mirror 4 to form an image on a semiconductor position detecting element PSD5 passing through the light receiving lens 3'. The position of the light spot S determined by this trigonometrical distance measuring system corresponds to distance between the light emitting diode 1 and the reflection mirror 4, namely, detection distance optically and is determined as current or voltage value.
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