Optical pick-up device, optical disk apparatus and method for detecting orbit identification signal

An optical pick-up and optical detection device technology, applied in the field of track identification signal detection, optical disc equipment and track identification signal detection, can solve the problems of tracking error signal and large amplitude change of track identification signal, etc., to reduce the number of parts and simplify the structure of parts , cost-saving effect

Inactive Publication Date: 2002-04-17
SONY CORP
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  • Claims
  • Application Information

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Problems solved by technology

There is a problem that the tracking error signal and the track identification signal will cause large amplitude changes when the optical d

Method used

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  • Optical pick-up device, optical disk apparatus and method for detecting orbit identification signal
  • Optical pick-up device, optical disk apparatus and method for detecting orbit identification signal
  • Optical pick-up device, optical disk apparatus and method for detecting orbit identification signal

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Example Embodiment

[0075] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0076] The optical disc apparatus according to the present invention including the optical pickup apparatus according to the present invention can select an optical disc from among various types of optical discs as an optical recording medium and record and reproduce information signals on these optical discs. The optical disc apparatus is capable of land-groove recording by using an optical disc capable of land-groove recording, such as a so-called DVD-RAM disc.

[0077] like Figure 5 As shown, the optical disc apparatus includes a spindle motor 1 as means for rotationally driving an optical disc as an optical recording medium. The spindle motor 1 has a drive shaft mounted with a disc table (not shown). The optical disc 101 is mounted on the disc turntable and rotates together with the disc turntable. The spindle motor 1 is controlled by the servo control cir...

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Abstract

A primary spot and a secondary spot are formed on an optical disc 101. The primary spot is used for recording and reproduction. The secondary spot is positioned apart from the primary spot. The secondary spot differs from the primary spot in a distance from an objective lens. This distance (defocus amount) Def satisfies a range: 0.4xDef0<=Def<=1.7xDef0. It is assumed that a light source wavelength is lambd, a track pitch of the optical disc 101 is Tp, and a numerical aperture of the objective lens is NA and that Def0=[0.178lambd/{1-cos(sin-1 NA)}].[{1-(lambd/(Tp.NA))}+2.35].

Description

field of invention [0001] The present invention relates to an optical pickup device for writing and reading information signals on an optical recording medium, an optical disc device for recording and reproducing information signals on an optical recording medium including such an optical pickup device, and a device for receiving The track identification signal detection method of the track identification signal is used to receive the recording track position on the optical disc device. More particularly, the present invention relates to an optical disc device for land-groove recording, and an optical disc device and a track identification signal detection method for the optical disc device. Background technique [0002] Optical recording media such as optical discs have conventionally been proposed. Also, an optical disc device is proposed as a device for recording and reproducing an information signal using an optical recording medium. Optical disc devices use optical di...

Claims

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Application Information

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IPC IPC(8): G11B7/085G11B7/007G11B7/09G11B7/12G11B7/13G11B7/131G11B7/133G11B7/135G11B7/1353
CPCG11B7/00718G11B7/133G11B7/08541G11B7/0903G11B7/131G11B7/0909G11B7/0943G11B7/0906G11B7/1353G11B7/09G11B7/085
Inventor 西纪彰
Owner SONY CORP
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