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US 8,238,210 B2Granted
Optical recording medium, optical recording medium driving apparatus, and optical recording medium driving method
AssigneeSony Corporation
InventorsHirotaka Miyamoto, Takeshi Kubo, Kimihiro Saito
Life of this patent
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Abstract
An optical recording medium driving apparatus includes an optical pickup which irradiates first and second laser lights from one object lens with respect to an optical recording medium having a bulk layer and a tilt detection surface; a focus control portion that performs the focus control relative to each predetermined position of the optical recording medium in regard to each of the first and second laser lights; a tracking control portion that controls the position of the object lens to perform the tracking control of the first and second laser lights relative to the optical recording medium; and a tilt control portion.
Claims7
An optical recording medium driving apparatus comprising:
- an optical pickup to irradiate first and second laser lights from one object lens with respect to an optical recording medium which has a bulk layer on which optical recording information is recorded by laser light irradiation and a plurality of recording layers with optical recording information recorded thereon is formed and which has a tilt detection surface which is formed at an inner side from the bulk layer when seen from a laser light incident surface side;
- a focus control portion to perform the focus control relative to each predetermined position of the optical recording medium in regard to each of the first and second laser lights;
- a tracking control portion to control the position of the object lens to perform tracking control of the first and second laser lights relative to the optical recording medium;
- and
- a tilt control portion to vary a slope state of an incident light axis of the first and second laser lights to the optical recording medium, relative to the optical recording medium, based at least in part on information of a returning light of the laser light of either the first or second laser lights from the tilt detection surface, thereby performing a tilt correction;
- in the optical recording medium, at a front side from the bulk layer when seen from the laser light incident surface side, a standard surface is provided which is formed with a groove having address information,
- the first and second laser lights are laser lights having wavelengths different from each other in which the first laser has a short wavelength,
- when performing the tilt correction, the focus control portion performs the focus control of the first laser light with respect to the tilt detection surface, in the state the focus control of the second laser light with respect to the standard surface having been performed, and
- the tilt control portion performs the tilt correction based on information of the returning light of the first laser light from the tilt detection surface.
6 more elements
An optical recording medium driving apparatus comprising:
- an optical pickup to irradiate first and second laser lights from one object lens with respect to an optical recording medium which has a bulk layer on which optical recording information is recorded by laser light irradiation and a plurality of recording layers with optical recording information recorded thereon is formed and which has a tilt detection surface which is formed at an inner side from the bulk layer when seen from a laser light incident surface side;
- a focus control portion to perform the focus control relative to each predetermined position of the optical recording medium in regard to each of the first and second laser lights;
- a tracking control portion to control the position of the object lens to perform tracking control of the first and second laser lights relative to the optical recording medium;
- and
- a tilt control portion to vary a slope state of an incident light axis of the first and second laser lights to the optical recording medium, relative to the optical recording medium, based at least
- a tilt control portion to vary a slope state of an incident light axis of the first and second laser lights to the optical recording medium, relative to the optical recording medium, based at least in part on information of a returning light of the laser light of either the first or second laser lights from the tilt detection surface, thereby performing a tilt correction;
- wherein the tilt detection surface in the optical recording medium is formed as a groove or a pit row having address information,
- wherein the first and second laser lights are laser lights having the same wavelength,
- wherein, when performing the tilt correction, the focus control portion performs the focus control of the second laser light with respect to the tilt detection surface, and
- wherein the tilt control portion performs the tilt correction based on information of the returning light of the second laser light from the tilt detection surface.
7 more elements
Dependencies are inferred from the claim text.