| 摘要 |
There is provided a focus control device including sensor means ( 101 ); error signal synthesizing means ( 102 ); arithmetic means ( 103 ) having an error input portion ( 104 ), a disturbance addition portion for adding a first disturbance value group to a focus error value group generated by the error input portion and producing an output, a phase compensation portion for performing at least a phase compensation calculation and an amplification calculation according to an amplification calculation gain on the output of the disturbance addition portion and generating a drive value group, a drive output portion ( 106 ) for generating a drive signal based on the drive value group, a response detection portion for detecting a detection complex amplitude value based on the focus error value group, a second disturbance value group, a second disturbance value group, and a third disturbance value group, and a gain modification portion for modifying the amplification calculation gain; driving means ( 108 ); and a focus actuator ( 109 ). The amplification calculation gain in the gain modification portion is modified based on the detection complex amplitude value, a predetermined complex amplitude value, and a correction complex value, and the phase of the correction complex value is substantially identical to the phase of the first disturbance value group. |
