| 摘要 |
A lens holder ( 101 ) holds an objective lens ( 4 ) and a support shaft ( 103 ) is inserted in a bearing hole ( 101 a) in the lens holder ( 101 ). Light that is emitted from a light source and reflected by an information recording medium enters two light receiving parts, which output currents (I 21 a, I 21 b) responsive to the amounts of light received. A controller ( 109 ) applies a current (I 96 ) based on the difference between the currents (I 21 a, I 21 b) to coils ( 116 a) in an inclination drive unit ( 106 ). By interaction between the coils ( 116 a) and magnets ( 116 b), the lens holder ( 101 ) is turned on a first axis (I) while the light source and other components are secured. Fluids provided in the bearing hole ( 101 a) further improve the vibration-resisting properties.
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