| 摘要 |
PURPOSE:To make a composition of a device easy and to dump vibration of a driving device by combining a direct advancing guide and a driving device by one of two guiding members in a directly advancing and shifting device of a light recording and reproducing device. CONSTITUTION:A round bar 6a of a diameter (d) is used, a motor shaft 5 is pressured to a round bar 6a with guide rollers 8 and 8a and a spring 9 and a slider 1 is shifted by a rotation of the motor shaft 5 in the X-X' direction. Guide rollers 8 and 8a are fitted freely rotatably on the pivot by a suitable means to a mechanical base. When a diameter (d) of a round bar 6a of length (l) is d<0.288l, a displacement in the Y-Y' direction becomes larger compared with the X-X' direction. Length of the round bar 6a is made long, a movable scope of a slider 1 is set near the center of the round bar 6 and then, a peculiar vibration number of the Y-Y' direction becomes very low and the vibration number of the X-X' direction becomes high. Since a frequency response of positioning of the X-X' direction is high, the bar becomes a low-pass filter effective for an external vibration at the time of a focus servo in the Y-Y' direction, the vibration of a driving device and the external vibration can be dumped effectively. |
