| 摘要 |
PURPOSE:To form a turning body so as to be freely turnable, and also, to improve servo-performance and reliability by providing the turning body in turning an optical head, and coils coupled electromagnetically to each other to an opposed fixed body, and constituting a rotary transformer. CONSTITUTION:A current C is supplied to a coil 15a of a fixed body 16 from a power source part, and a voltage C' induced in a coil 14a of an opposed turning body is rectified, and supplied as electric energy required for a driving current D required for a semiconductor laser of an optical pickup 1, a processing circuit of an output signal E of a photodetector, a servo-amplifier for processing a tracking control signal, a focusing control signal, etc., a driving current F supplied to a focusing control coil 18 and a tracking control coil 20, etc. Also, an information reproducing signal G outputted from an electronic circuit 13 is taken out as a signal G' to the fixed part 16 side through a pair of coils 14b, 15b. |
