| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that the thickness of the bottom is insufficient when the resolution is low in an encoder scale made by using light-transmitting member and utilizing total reflection of a slope to constitute a light shielding part. Ž<P>SOLUTION: In the encoder scale in which light-transmitting and light shielding parts are alternately formed on a planar light-transmitting member 1 and light is incident thereon from one surface direction of a plane, the light shielding parts form a groove 12 by at least two or more adjoining slopes comprising an angle of a critical angle of total reflection or more determined by the refractive indexes of the light-transmitting member and air with respect to the plane on the other surface of the incident surface of light. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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