| 摘要 |
An optical sensor has first light receiving surfaces having respective pentagonal or hexagonal shapes and being independent of each other, and second light receiving surfaces having respective hexagonal shapes and being independent of each other, third light receiving surfaces having respective hexagonal shapes and being independent of each other, fourth light receiving surfaces having respective hexagonal shapes and being independent of each other, and fifth light receiving surfaces having respective hexagonal shapes and being independent of each other. A relationship between a size of each of the light receiving surfaces and a diameter of respective one of light beams received by corresponding one of the light receiving surfaces is set within a predetermined range. A light beam multiple-dividing element diffracts the light beams received by a first grating area to form +primary lights, and diffracts the light beams received by second and third grating areas to form +primary lights and -primary lights. Relationships of U/D and V/D are set within predetermined ranges.
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