| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the reliability by increasing the stability of a frame by preventing the backlash of the frame. SOLUTION: A frame 3 is supported on a base plate 1 in such manner that it can be tilted through a supporting shaft 2 in a longitudinal direction and a lateral direction, and an actuator for longitudinal tilt 4 is mounted at a front side, an actuator for laterial tilt 5 is mounted at a right side, a first gas spring 6 is mounted at a back side, and a second gas spring 7 is mounted at a left side, between the base plate 1 and the frame 3. Accordingly the first gas spring 6 energizes the actuator for longitudinal tilt 4 in one direction through the frame 3, and the second gas spring 6 energizes the actuator for lateral tilt 5 in one direction through the frame 3, whereby the backlash of the frame 3 caused by the play of connecting potions of the actuators for tilt 4, 5 and the connection parts, can be prevented, and the frame 3 can be stabilized.</p> |
