| 摘要 |
A lens assembly includes a lens barrel. A photographing lens system is contained in the lens barrel, and has a first lens on an objective side. A lens opening is formed in the lens barrel, for passing object light toward the first lens. A lens cover blade closes the lens opening in an openable manner for protection. Support shafts movably support the first lens. A lens moving cam device with an inclined cam surface moves the first lens along an optical axis in response to shifting of the lens cover blade. Furthermore, a cover shifting ring rotates when externally operated, for shifting the lens cover blade. A cover moving mechanism with a pin and hole shifts the lens cover blade when the cover shifting ring rotates. The lens moving cam device moves the first lens along the optical axis in response to rotation of the cover shifting ring.
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