| 摘要 |
A lens barrel has a fixed member, a rotating member for shifting an optical system with respect to the fixed member in a direction of an optical axis, and a rotation amount detecting encoder for detecting an amount of rotation of the rotating member with respect to the fixed member. The encoder has a first rotation detecting scale provided integrally on the rotating member, a second rotation detecting scale provided on the fixed member, a light emitting device provided on the fixed member and a light receiving device provided on the fixed member to receive light from the light emitting device through the first and second rotation detecting scales, wherein the rotating member can be set so as to rotate 360 DEG or more.
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