| 摘要 |
PURPOSE:To make control for radial and tangential direction of recording track with good accuracy, by supporting an external side center of lens mirror cylinder with a supoort spring made of synthetic rubber, and applying drive force of tracking control and time axis correction control from both sides of driven body. CONSTITUTION:A support spring 5 made of synthetic rubber is bonded to side center of a lens mirror cylinder 3 containing a lens 4, and abother end of the spring 5 is fixed to a case 6. A tracking coil moving coil is provided in magnetic circuits 8A, 8B at a point symmetrical position at the cross point between the center line of the spring 5 and the light axis of the lens 4, and a focussing control moving coil 10 is supported in air-gap 13 of a magnetic circuit 12 at lower end circumference of the lens mirror sylinder 3. The control of radial and tangential directions of recording track can be made with good accuracy, by flowing a control current to moving coils 7A, 7B and 10. |
