| 摘要 |
PURPOSE:To drive an optical system with less power consumption, by providing at least a pair of electromagnets which clip an optical system and drive it, flowing a current to the electromagnets alternately and driving them. CONSTITUTION:A lens barrel 1 made of a magnetic substance is driven with pair electromagnets 2a, 2b and 3a, 3b. In this case, tracking and tangential error signals are inputted to driving circuits 4a, 4b and transistor pairs Q1a, Q1b: Q2aQ2b are activated in response to the polarity of each error signal to switch a driving current applied to each electromagnet. Then, the direction of the force exerted to the lens barrel 1 made of the magnetic substance is inverted and a current only in response to the error signal is applied, allowing to improve the utility of a power supply. |
