| 摘要 |
PURPOSE:To detect a relative distance between two objects under a relative mov- ements, from a wavelength of a light detected by a light-receiving device, by a me- thod wherein a projecting and light-receiving parts are mounted at either of the sur- faces of the two objects which are positioned facing and opposite to each other, and a reflection surface, mounted on the other surface, is irradiated with a plurality of lights being different in their wavelength. CONSTITUTION:A projecting and a light-receiving device are mounted on either of surfaces of the two objects which are positioned facing and opposite to each other, and a reflection surface is mounted at the other surface to case the light axis of the light-receiving device to coincide with a direction of a relative distance to be detect- ed. Then, the projecting device irradiates a plurality of light fluxes being different in wavelength or color at appropriate intervals obliquely to said light axis, and the light-receiving part receives the reflection light to detect a relative distance from the wavelength or the color irrespective of th two objects. For example, a projecting part 1 and a light-receiving device 20 are mounted on either of surfaces of two objects A and B, which are positioned facing and opposite to each other, and a reflection surface 3 located on the othersurface. The projecting device 1 projects a plurality of light fluxes 5a-5f being different in color, and the light-receiving device 20 receives the reflection light. The color of the light so received changes in accordance with the distance, and thereby the discrimination of the color detects a relative distance. |
