| 摘要 |
PROBLEM TO BE SOLVED: To perform fine-movement tracking by fine-adjusting the incident angle of a laser luminous flux on the objective optical system of the tip part of a rough- moving arm moved in the intersection direction of the track of a magneto-optical disk by a deflecting means such as a galvano-mirror. SOLUTION: This optical information recording/reproducing head is adapted to turn luminous fluxes emitted from a laser beam source into parallel luminous fluxes, and then making them incident on an objective optical system by a deflecting means and converging them on an optical disk. This head is rotated around a rotary axis, and provided with a deflecting mirror 26 and a movable part 140, coils 148 and 149 are provided in both ends of the movable part, permanent magnets 146 and 147 are disposed near both ends of the movable part, and the movable part is rotated by supplying a current to the coils. The differential output A-B of holding elements 144 and 145 provided in an unmovable part is sampled/held by a phase similar to or the shifting of 180 deg. from the output waveform of an oscillator for applying an AC bias current to the holding elements, inputted to a differential amplifier, electrostatic noise is eliminated, necessary components are taken out, and a rotational position is detected by a rotational position detecting means. |
