| 摘要 |
PURPOSE:To make it possible to detect the specified position at higher accuracy and stability than the remaining position detecting part, by allowing a spot light to displace and only a slit light to pass the specified position containing a detecting range. CONSTITUTION:A beam of light emitted from the source 1 is limited into a slit light by a fixed plate 2 and further, it is limited into a beam of slit light different from spot light or slit light by a moving slitted plate 3, or projected onto a light-receiving surface of a detecting device 4 after transmission as the slit light. On the part excepting both ends of the moving slitted plate 3a, after travelling of the spot light over the light-receiving surface in corespondence with the movement of the travelling slitted plate 3, a position of the plate 3 is detected by a detecting means 5. The slit light is allowed to pass as a beam of slit light in a certain part and in the remaining part, it is limited to the spot light and at the same time, the spot light is given with displacement and by detection by a 1-dimensional type conductor position detector, higher and more stable position detection of the specified position becomes available.
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