| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize an optical system in the case of housing by withdrawing a 1st lens unit in space made free by withdrawing a 2nd lens unit. SOLUTION: When a mode other than a photographing mode such as a power source turnoff mode or a reproducing mode is selected, a step motor is driven and a third group lens barrel is moved to a collapsing standby position (S111 and S112). Next, a DC motor is driven to move the lens barrel to a collapsible position, and then the photographing mode is finished (S113 and S114). At the time of starting photographing, a second group lens barrel is extended first, and then the third group lens barrel is driven to be extended to the space made free by extending the second group lens barrel. At the time of collapsing, the third group lens barrel is withdrawn to the collapsible position first, and then the second group lens barrel is driven to be withdrawn to the space made free by withdrawing the third group lens barrel. Thus, a distance between the lens barrels at the time of collapsing is made extremely small while avoiding the collision of the lens barrels, and the optical system in the case of housing is miniaturized.
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