| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical rotary encoder capable of aligning accurately and easily a rotary side slit and a fixed side slit, and a light emitting element and a light receiving element for detecting those, and allowing easily assembling. Ž<P>SOLUTION: This optical rotary encoder is constituted of a housing 12 having a circular hole 18 inserted with a rotary cylindrical body 37, a rotary disk 32 provided with the rotary side slit 33 and fixed to the rotary cylindrical body 37, and a fixedly arranged circular circuit board 42, the housing 12 includes an aligning pin 19 implanted in a prescribed position set using the center position of circular hole 18 as a reference, a fixed slit plate 23 positioned fixedly via the aligning pin 19, to position the fixed side slit 24 in a faced position faced to the rotary side slit 33, and the light emitting element 21 arranged in an under side of the fixed slit plate 23, and the circular circuit board 42 includes an engagement protrusion piece 44 for facing substantially the light receiving element 45 to the light emitting element 21, when engaged with a positioning groove 16 provided in the housing 12. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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