| 摘要 |
PURPOSE:To obtain a controller with excellent access settling by arranging a spring supporting point to a radial actuator on a gravity line directed in radial direction through the weight position of a moving section including an objective lens as a radial actuator mechanism. CONSTITUTION:Figure shows the case that the lengthwise direction of a radial spring 11 is brought into the radial direction (a) and that the lengthwise direction of radial springs 11, 11 is brought into the vertical direction in the radial direction (b). In either (a) or (b), the supporting point of the spring 11 is arranged on the gravity line directed in radial direction through the center of gravity G in the radial actuator moving section 4' itself including the objective lens 4, then the turning movement around the movable center of gravity G is executed easily and the rigidity in radial direction of the spring is increased in a parallel progressing movement in the radial direction of the moving part center of gravity G and restricted. |
