| 摘要 |
PURPOSE:To improve the precision of focusing and tracking control by the yawing of the transfer optical system part of a separated optical system in an optical head having the separated optical system separating an optical system. CONSTITUTION:A luminous flux is inputted to a transfer device 103 as the transfer optical system part of the separated optical system from a transfer direction beta by a fixed optical system part 101 of the separated optical system being a light source. The luminous flux is reflected by reflection surfaces 106a and 106b in a plane containing roughly the center of the luminous flux and the center of the optical axis of an objective lens 104 and supplied to the objective lens 104 from a focus direction in the transfer device 103. An objective lens driving device 105 focusing-, tracking-driving the objective lens 104 and the reflection surfaces 106a and 106b are provided on the transfer device 103 and the optical path of the luminous flux is controlled and the luminous flux is supplied to the objective lens 104. By the above constitution, the excellent optical head improving remarkably the degradation of the precision of focusing, tracking control by the yawing of the transfer device as the transfer optical system part of the separated optical system is obtained. |
