| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deviation of two light spots in the tracking direction even when the relative position of both spots is varied in their focus direction and in the directions orthogonal thereto by an objective lens when an optical element is moved. SOLUTION: A collimator lens 15 of a support drive 50 is fixed at an opening part of a holder 51, and one of both ends of each of parallel plate springs 52 is fixed to the holder 51 with the other end fixed to a fixing member 53 respectively. Then two yokes 55 are provided on a base 54 and the magnets 56 which are magnetized so as to have bipolarity are fixed to the inner sides of yokes 55 respectively. The coils 57 are fixed on two faces set opposite to the magnets 56 of the holder 51, and a target 58 is fixed to the holder 51 and a sensor 17 is fixed on the lower face of the base 54. |
