| 摘要 |
A zoom lens operating mechanism comprises a stationary cylinder, an operating ring rotatably mounted on the stationary cylinder, a cam cylinder rotatably mounted within the stationary cylinder and coupled to the operating ring for rotation therewith, at least one lens group coupled to the cam cylinder so as to be movable within a zoom range as the operating ring is rotated within a first angular range and within a close-up range as the operating ring is rotated within a second angular range, a guide arrangement formed in the stationary cylinder, and an operating member mounted on the operating ring and cooperating with the guide arrangement to define the first and second angular ranges. The guide arrangement comprises contiguous first and second guide grooves with a stop at the junction therebetween, and the operating member is rotatable relative to the operating ring and includes a locking device extendable into the first and second guide grooves such that upon rotation of the operating ring by the operating member through the first range, the locking device moves along the first guide groove and is locked at the stop, and upon rotation of the operating member the locking device is released from the stop and the locking device can then move along the second guide groove so that the operating ring is rotatable within the second range.
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