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US 2004/0172644 A1Published application
Optical head apparatus and optical disk apparatus using this optical head apparatus
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Shinozuka
Life of this patent
Estimating the term…
Abstract
The present invention obtains drive forces symmetrical with a magnetic body at the center by holding the magnetic body positioned at the substantial gravity point of an actuator between two magnets in order to assure two magnetic circuits and arranging a focusing coil and tracking coils between the magnetic body and the both magnets.
Claims18
An optical head apparatus comprising:
- an object lens which condenses light beams onto a recording surface of an information recording medium or the like which records information therein;
- a lens holder which holds the object lens so as to be movable in an optical axis direction of the object lens and a direction parallel to the recording surface of the information recording medium;
- a magnet having surfaces on which an arbitrary magnetic pole is directed in one direction;
- a coil which has coil surfaces, is provided in the lens holder, and generates a force in accordance with a magnetic field from the magnet in order to move the lens holder at least one of the optical axis direction and the direction parallel to the recording surface;
- a magnetic body which reduces transmission of the magnetic field from the magnet which acts on the coil;
- and
- a support member which supports the lens holder so as to be movable in a predetermined direction.
4 more elements
An optical head apparatus comprising:
- an optical head which has an object lens which condenses light beams onto a recording surface of an information recording medium or the like which records information therein;
- a lens holder which holds the object lens so as to be movable in an optical axis direction of the object lens and a direction parallel to the recording surface of the information recording medium;
- a magnet having surfaces on which an arbitrary magnetic pole is directed in one direction;
- a coil which has coil surfaces, is provided in the lens holder, and generates a force in accordance with a magnetic field from the magnet in order to move the lens holder at least one of the optical axis direction and the direction parallel to the recording surface;
- a magnetic body which reduces transmission of the magnetic field from the magnet which acts on the coil;
- and a support member which supports the lens holder so as to be movable in a predetermined direction;
- a photodetector which detects light beams reflected on the recording surface of the recording medium and converts them into an electric signal;
- and
- an information processing circuit which reproduces information recorded in the recording medium from the electric signal outputted from the photodetector.
6 more elements
Dependencies are inferred from the claim text.