| 摘要 |
PCT No. PCT/JP85/00584 Sec. 371 Date Jun. 18, 1986 Sec. 102(e) Date Jun. 18, 1986 PCT Filed Oct. 18, 1985 PCT Pub. No. WO86/02441 PCT Pub. Date Apr. 24, 1986.An optical rotary encoder converts a rotational angle of a shaft (13) rotatably supported in a base member of flange (11) into an output of an electrical digital quantity. A light-receiving system (18) including at least one photoelectric conversion element is fixed to a certain place on the flange (11). A stationary encoding plate (19) having a certain light-transmitting pattern is fixed to the flange so as to face the light-receiving surface of the light-receiving system. A rotary encoding plate (15) having a certain light-transmitting pattern is fixed to the shaft so as to be in opposition to the stationary encoding plate. A light-source support member (20) is arranged rotatably about the axis of the shaft with respect to the flange. A light source having light-emitting elements (22, 23; 123, 223) is attached to the light-source support member so as to be in opposition to the rotary encoding plate. The light-source support member is fixed to the flange by a fixing element (25) after a positional adjustment thereof is performed. The light-source support member may include two individually adjustable members each supporting a light-emitting element.
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