| 摘要 |
PURPOSE: To lighten the camera drive, to reduce the size and to improve durability by finely adjusting the camera by lightly using a cam of rolling contact and elastic depression. CONSTITUTION: Three pairs of cam grooves 31, 32 opposed to each other are formed in a circular arc along the same circumferences of the opposite faces of a cam driving ring 29 and a cam driven ring 30, three cam balls 33 are arranged between respective pair of cam grooves 31, 32 and the ring 30 is depressed to the side of the ring 29 in parallel by three compression coil springs 34. A CCD camera 1 is moved in parallel in the optical axis direction together with the ring 30 by the cam action of rolling contact of the cam balls 33. |
