| 摘要 |
There is provided an optical encoder increasing an area of bringing a rotation disk and a hub into contact with each other, capable of drawing air at faces of the rotation disk and the hub brought into contact with each other even when there is not a center hole portion at the rotation disk, having a high adhering strength of the rotation disk and promoting a reliability. In an optical encoder including a rotation disk (1) having a slit pattern for passing light between a light receiving portion and a light emitting portion, and a hub (2) for fixing the rotation disk (1) to a rotating shaft (6), there is constructed a constitution in which the hub (2) includes a first groove (4) formed in a shape of a concentric circle at an end portion on a side of a face thereof attached to the rotation disk (1) and a second groove (5) formed to be orthogonal to the first groove (4) in a normal line direction thereof, and an adhering agent (3) for fixedly attaching the rotation disk (1) and the hub (2) is filled in the first groove (4) and the second groove (5) of the hub (2). Thereby, air at faces of the rotation disk (1) and the hub (2) brought into contact with each other can be drawn, and therefore, the adhering strength of the rotation disk (1) is increased and also the reliability is promoted.
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