| 摘要 |
An object of the present invention is to provide an optical disc apparatus which can adjust a gain and an offset in lens shift control with a high precision in a short period of time. The optical disc apparatus according to the present invention includes a semiconductor laser 11 , a condensing lens 13 , a tracking actuator 15 , a main TE generator 20 , a sub TE generator 21 , an LE generator 40 , a midpoint filter 42 , a circuit offset detector 50 , a stray light offset detector 51 , an offset compensator 53 , an apparatus instructor 56 , and an offset instructor 54 . The circuit offset detector 50 , the stray light offset detector 51 , and the offset compensator 53 compensate an offset of a signal from the LE generator 40 . The apparatus instructor 56 outputs a signal indicating an apparatus state as a search operation, a recording operation, reproduction operation, or waiting. The offset instructor 54 gives instructions to perform circuit offset compensation at timing when the signal from the apparatus instructor 56 is switched to the search operation from any of the other states.
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