| 摘要 |
A camera capable of obtaining stable resolution and saving cost is provided.A camera includes a fixed cylinder 20 fixed to a camera main body, a rotatable ring 21 that is allowed to rotate around the optical axis when driven by a first driving gear 1, a focus cylinder 22 linked to the rotatable ring 21 through a cam mechanism so as to move linearly in the optical axis direction in association with a rotation of the rotatable ring 21, and a rotationally movable cylinder 23 engaged with the focus cylinder 22 in the optical axis direction so as to move in association with a movement of the focus cylinder 22 in the optical axis direction and provided rotatably around the optical axis with respect to the focus cylinder 22 in the rotating direction so as to rotate when driven by a second driving gear 2, wherein a picture is taken by effecting a zooming operation by driving the second driving gear 2 while changing a distance between two lens groups, and after setting a desired magnification by changing a relative distance between the two lens groups, effecting a focusing operation by driving the first driving gear 1 while maintaining the distance between the two lens groups.
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