| 摘要 |
Guide grooves are formed on the inner periphery of a first lens barrel along an optical axis, and guide couplers are coupled with the guide grooves to guide the first lens barrel along the optical axis. Inclined parts are formed on both sides of the guide grooves, and inclined parts are formed on both sides of the guide couplers. Thus, the guide couplers do not easily come off from the guide grooves even if a pressure is applied to them.
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