| 摘要 |
A shade layer 35 made from photosensitive material is formed on a surface of a rotational slit disk 3 of an optical encoder 1, and a slit pattern 36 is formed in the shade layer 35. This shade layer 35 is covered with and protected by a protective layer 39 made from such materials as acrylic resin. Accordingly, the slit pattern 36 can be prevented from being touched and damaged by other members. Further, the slit pattern can be prevented from being deteriorated by air. In addition, by giving an appropriate optical property to the protective layer, it is possible to make the optical property of the surface of the rotational slit disk appropriate.
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