| 摘要 |
<p>There is provided an objective lens control device (10) having an objective lens (21), applying light from a light source via the objective lens (21) to a disc (31), and receiving the return light. By controlling the position of the objective lens (21), the focus of the light applied is controlled. The objective lens control device (10) includes: an error focus position detection unit (12) or an RF focus position detection unit (13) for detecting the position of the objective lens (21) through which the light irradiated from the light source is focused on the disc (31) by detecting a predetermined signal from the return light received; and a focus drive control unit (17) for controlling the objective lens (21) so that the movement direction of the objective lens (21) in the focus direction is reversed when the error focus position detection unit (12) or the RF focus position detection unit (13) has detected a focus position.</p> |
