| 摘要 |
PURPOSE:To drive stably an objective lens by a small-sized and light constitution by connecting focusing use and tracking use plate springs through a repeating member, and providing a coil for generating a magnetic field on the surface orthogonal to the optical axis. CONSTITUTION:Each one end of a pair of tracking T use plate springs 8a, 8b and focusing F use plate springs 6a, 6b opposed in parallel is connected to a repeating member 7, and the springs 8a, 8b are opposed at an angle alpha, therefore, the springs 6a, 6b are not twisted even by a movement of the T direction, and an objective lens 1 can be supported so that it can move in the F direction and the T direction. The springs 6a, 6b, 8a and 8b are shaped like a plate and can be manufactured at a low cost. Since coils 12a, 12b and 13 for driving the objective lens 1 is installed to a lens supporting member 2, a size of the optical axis direction becomes small and a device can be made small-size and light in weight, the objective lens can be bright to a driving control stably and with a high accuracy by concentrating the center of gravity of the movable part, and the assembly can also be executed easily. |
