Optical pickup and optical disk apparatus
AssigneeSony Corporation
InventorsKenji Yamamoto, Noriaki Nishi
Life of this patent
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Abstract
An optical pickup adapted to operate for optical disks of a plurality of different types and an optical disk apparatus include a light source for emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk, an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate, and a first aberration correcting means arranged on the light path of the first light beam between the light source and the objective lens to generate an aberration for canceling the coma arising due to the objective lens.
Claims22
An optical pickup adapted to operate for optical disks of a plurality of different types, the optical pickup comprising:
- a light source for emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- and
- first aberration correcting means arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens.
The optical pickup according to clam 4, wherein
- the second aberration correcting means imposes an aperture limit to the first light beam or the second light beam so as to correspond to the numerical aperture for the first light beam or the numerical aperture for the second light beam.
An optical pickup adapted to operate for optical disks of a plurality of different types showing different thicknesses for the transparent substrate for receiving a light beam, the optical pickup comprising:
- a light source for selectively emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- first aberration correcting means arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens;
- and
- the first aberration correcting means transforming the first light beam emitted from the light source from collimated light into a wave front having the profile of the first aberration correcting means and containing a power component.
The optical pickup according to clam 11, wherein
- the second aberration correcting means imposes an aperture limit to the first light beam or the second light beam so as to correspond to the numerical aperture for the first light beam or the numerical aperture for the second light beam.
An optical disk apparatus equipped with an optical pickup adapted to operate for optical disks of a plurality of different types, the apparatus comprising:
- a light source for emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- and
- first aberration correcting means arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens.
The apparatus according to clam 13, wherein
- the second aberration correcting means imposes an aperture limit to the first light beam or the second light beam so as to correspond to the numerical aperture for the first light beam or the numerical aperture for the second light beam.
An optical pickup adapted to operate for optical disks of a plurality of different types, the optical pickup comprising:
- a light source for emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- and
- a first aberration correcting unit arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens.
An optical pickup adapted to operate for optical disks of a plurality of different types showing different thicknesses for the transparent substrate for receiving a light beam, the optical pickup comprising:
- a light source for selectively emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- a first aberration correcting unit arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens;
- and
- the first aberration correcting unit transforming the first light beam emitted from the light source from collimated light into a wave front having the profile of the first aberration correcting unit and containing a power component.
An optical disk apparatus equipped with an optical pickup adapted to operate for optical disks of a plurality of different types, the apparatus comprising:
- a light source for emitting a first light beam with a wavelength matching a first optical disk or a second light beam with a wavelength matching a second optical disk;
- an objective lens for converging the first light beam or the second light beam emitted from the light source onto the recording surface of the first optical disk or the second optical disk, whichever appropriate;
- and
- a first aberration correcting unit arranged on the light path of the first light beam between the light source and the objective lens to cancel the coma arising due to the objective lens.
Dependencies are inferred from the claim text.