| 摘要 |
semi-cylinder-shaped sensor bodies (1)(1') having cut faces (3)(3') coated with a black anodic oxidation film, the sensor bodies being provided with tooth holes (2)(2') and gradients formed in the upper surfaces thereof; reflection plates (5)(5') coated with polished nickel on the inner surfaces thereof and positioned between the sensor bodies (1)(1'); and a sensor support plate (8) fixed on the lower surface of the sensor bodies (1)(1') and the reflection plates (5)(5') and having a photo sensor (9) and a pad (10) sequentially laminated thereon.
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