| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical encoder having resolution improved without narrowing the slit pitch or width in the traveling direction of a light receiving element. SOLUTION: The light receiving block on the first row in the direction perpendicular to the traveling direction has four light receiving elements 3 (A[1], B[1], A'[1], B'[1]), and the light receiving block on the second row has four light receiving elements 3 (A[2], B[2], A'[2], B'[2]). The shape of each light receiving element 3 is the same (width in the traveling direction is substantially P/4 and width in the direction perpendicular to the traveling direction is substantially W/2). The position of the light receiving block on the second row in the direction perpendicular to the traveling direction is shifted by P/8 in the traveling direction and W/2 in the direction perpendicular to the traveling direction with reference to the light receiving block on the first row. COPYRIGHT: (C)2007,JPO&INPIT
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