| 摘要 |
PROBLEM TO BE SOLVED: To extend and collapse a lens barrel and to switch focusing with only the rotation of an electric motor in one direction by providing an endless cam groove moving forward and backward in the optical axis direction on one of a driving barrel assembling body and a moving barrel assembling body and a cam pin engaged with the cam groove on the other. SOLUTION: An endless cam groove moving forward and backward in the optical axis direction once or more is provided on one of a driving barrel assembling body and a moving barrel assembling body and a cam pin engaged with the cam groove is provided on the other. For example, the cam groove 3c formed on a rear part barrel 3 has two steps for freely stopping a front part barrel 5 at either of first or second extending positions having mutually different extending amounts. Then, focusing is performed by stopping the pin 5a of the barrel 5 at either extending position of the first extending position or the second extending position. Consequently, the focusing can be performed without an exclusive member in this camera.
|
