Optical disk recording/reproducing device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorMakoto Takasima
Life of this patent
Estimating the term…
Abstract
A moved distance detecting means (15) detects the moved distance in a tracking direction of an object lens, a position signal generating means (60) generates a position signal corresponding to the position of the object lens based on the detection, and a drive signal modulating means (40) modulates the drive current of a magnetic head (20) according to this position signal. Therefore, a drive current can be controlled according to the moved distance of the object lens to enable the magnetic head to be driven with a small current when a moved distance is small and with a large current according to a moved distance only when it is large, whereby it is possible to reduce an average drive current and hence reduce power consumption as a whole.
Claims6
An optical disk recording/reproducing device, comprising:
- a magnetic head that performs magnetic field modulation;
- an objective lens for focusing light on a recording medium;
- an objective lens actuator that allows the objective lens to perform a following operation in a focusing direction and a tracking direction;
- a shift amount detecting unit that detects a shift amount of the objective lens in the tracking direction;
- a position signal generating unit that generates a position signal corresponding to a position of the objective lens based on an output signal from the shift amount detecting unit;
- and
- a driving signal modulating unit that modulates a driving current for the magnetic head so as to correspond to the position signal.
Dependencies are inferred from the claim text.