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
CN1345037AInactive Publication Date: 2002-04-17SONY CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SONY CORP
Publication Date
2002-04-17
Estimated Expiration
Not applicable · inactive patent

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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].
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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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