| 摘要 |
PURPOSE:To contrive the improvement of the electromagnetic force efficiency with a simple constitution by constituting a focus magnetic driving circuit and a tracking magnetic driving circuit by the combination of two magnets as a pair, a focus coil and a tracking coil. CONSTITUTION:Magnetic force lines A generated from both opposed faces 3, 4 of two magnets 1, 2 are repulsed mutually ad bent laterally with respect to the direction of generation and induced to a yoke 9. In this case, in supplying a current to the focus coil 6 in the magnetic field space 5 and the tracking coil 7 in the magnetic field space 8 of the magnetic line of force B, the electromagnetic force in the 2-dimensional direction (X-X, Y-Y directions) orthogonal to the direction of the lines A, B is generated based on the Fleming's left hand rule by the magnetic force of the magnetic field spaces 5, 8. The bobbin having the focus coil 6 thereupon and the optical lens 21 fitted to the bobbin are driven by the electromagnetic force. Thus, the constitution is simplified, the device is miniaturized and the electromagnetic force efficiency is improved.
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