US 2003/0117909 A1 · Optical disk drive apparatus, optical pickup, manufacturing method therefor and adjusting method therefor

Abstract

An object of the invention is to provide an optical disk drive apparatus in which skew adjustment can be performed easily while allowing size, weight and cost reduction. An optical disk drive apparatus has an objective lens which converges a light beam to direct it to an optical disk, an objective lens support for supporting the objective lens on a chassis of the apparatus, an elastic support member which movably supports the objective lens on the objective lens support portion, and a coil and a magnet, one of which is provided substantially integral with the objective lens and another of which is mounted on the objective lens support portion independently from the objective lens. The coil and magnet are capable of moving, by an interaction of the coil and the magnet caused by supplying electric power to the coil, the objective lens against an elastic force of the elastic support member relative to the objective lens support portion so as to vary an angle of incidence of the light beam emitted from the objective lens with respect to an irradiated surface of the optical disk. As the angle of incidence, at least one of a radial direction tilt angle as a tilt angle of an optical axis with respect to the irradiated surface of the disk as seen from a direction perpendicular to a tracking direction and a tangential direction tilt angle as a tilt angle of the optical axis with respect to the irradiated surface of the disk as seen from the tracking direction, is adjusted only by variation in the angle of incidence caused by the electric power supply to the coil.

Claims15

Dependent claims

An optical disk drive apparatus comprising:

an objective lens which converges a light beam to direct it to an optical disk;
an objective lens support portion for supporting said objective lens on a chassis of the optical disk drive apparatus;
an elastic support member which movably supports said objective lens on said objective lens support portion;
and
a coil and a magnet, one of which is provided substantially integral with said objective lens and another of which is mounted on said objective lens support portion independently from said objective lens, said coil and said magnet being capable of moving, by an interaction of the coil and the magnet caused by supplying electric power to the coil, said objective lens against an elastic force of said elastic support member relative to said objective lens support portion so as to vary an angle of incidence of the light beam emitted from said objective lens with respect to an irradiated surface of the optical disk;
wherein, as said angle of incidence, at least one of a radial direction tilt angle as a tilt angle of an optical axis with respect to the irradiated surface of the disk as seen from a direction perpendicular to a tracking direction and a tangential direction tilt angle as a tilt angle of the optical axis with respect to the irradiated surface of the disk as seen from the tracking direction, is adjusted only by variation in said angle of incidence caused by the electric power supply to said coil.

3 more elements

An optical disk drive apparatus comprising:

an objective lens which converges a light beam to direct it to an optical disk;
an objective lens support portion for supporting said objective lens on a chassis of the optical disk drive apparatus;
an elastic support member which movably supports said objective lens on said objective lens support portion;
a coil and a magnet, one of which is provided substantially integral with said objective lens and another of which is mounted on said objective lens support portion independently from said objective lens, said coil and said magnet being capable of moving, by an interaction of the coil and the magnet caused by supplying electric power to the coil, said objective lens against an elastic force of said elastic support member relative to said objective lens support portion so as to vary an angle of incidence of the light beam emitted from said objective lens with respect to an irradiated surface of the optical disk;
and
incident angle adjusting means for adjusting said angle of incidence by controlling electric power supply to said coil based on an electric power supply control amount for the coil with which a predetermined angle of incidence would be attained.

3 more elements

A method for manufacturing an optical disk drive apparatus, the apparatus having:

an objective lens which converges a light beam to direct it to an optical disk;
an objective lens support portion for supporting said objective lens on a chassis of the optical disk drive apparatus;
an elastic support member which movably supports said objective lens on said objective lens support portion;
a coil and a magnet, one of which is provided substantially integral with said objective lens and another of which is mounted on said objective lens support portion independently from said objective lens, said coil and said magnet being capable of moving, by an interaction of the coil and the magnet caused by supplying electric power to the coil, said objective lens against an elastic force of said elastic support member relative to said objective lens support portion so as to vary an angle of incidence of the light beam emitted from said objective lens with respect to an irradiated surface of the optical disk;
and
incident angle adjusting means for adjusting said angle of incidence by controlling electric power supply to said coil based on an electric power supply control amount for the coil with which a predetermined angle of incidence would be attained;
said method comprising the steps of:
mounting an optical pickup having said objective lens, said objective lens support portion, said elastic support member, said coil and said magnet on a chassis of the optical disk drive apparatus;
obtaining information related to an angle of incidence of a light beam emitted from the objective lens of said optical pickup with respect to the irradiated surface of a disk for adjustment of the angle of incidence;
obtaining an electric power supply control amount for the coil with which a predetermined angle of incidence would be attained based on the obtained information;
and
setting said incident angle adjusting means in such a way as to control electric power supply to said coil based on the obtained electric power supply control amount.

9 more elements

An optical pickup comprising:

an objective lens which converges a light beam to direct it to an optical disk;
an objective lens support portion for supporting said objective lens on a chassis of an optical disk drive apparatus;
an elastic support member which movably supports said objective lens on said objective lens support portion;
a coil and a magnet, one of which is provided substantially integral with said objective lens and another of which is mounted on said objective lens support portion independently from said objective lens, said coil and said magnet being capable of moving, by an interaction of the coil and the magnet caused by supplying electric power to the coil, said objective lens against an elastic force of said elastic support member relative to said objective lens support portion so as to vary an angle of incidence of the light beam emitted from said objective lens with respect to an irradiated surface of the optical disk;
and
incident angle adjusting means for adjusting said angle of incidence by controlling electric power supply to said coil based on an electric power supply control amount for the coil with which a predetermined angle of incidence would be attained.

3 more elements

Dependencies are inferred from the claim text.

Optical disk drive apparatus, optical pickup, manufacturing method therefor and adjusting method therefor

Life of this patent

Optical disk drive apparatus, optical pickup, manufacturing method therefor and adjusting method therefor

Life of this patent

Abstract

Claims15