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Declination calibrating device

A correction amount, amplitude level technology, applied in the direction of head configuration/installation, instrumentation, optical recording/reproducing/erasing method, etc., can solve the problem that the tilt sensor cannot be installed, etc.

Inactive Publication Date: 2004-02-04
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such a tilt sensor cannot be installed in a slim-type disk drive device used in a portable personal computer or the like.

Method used

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  • Declination calibrating device
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  • Declination calibrating device

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Embodiment Construction

[0022] Now, preferred embodiments of the present invention will be explained with reference to the drawings. In the case of an optical disc having pre-pits formed thereon such as DVD-R and DVD-RW, there is a correlation between the amplitude level of the pre-pit signal and the amount of disc tilt. For this reason, in this embodiment, disc tilt amount detection and tilt correction are performed by using pre-pit signals.

[0023] figure 1 The diagram schematically shows the relationship between the disc on which the pre-pits are formed and the pre-pit signal. The disc 1 is, for example, a DVD-R or a DVD-RW, and grooves Gr and lands Ld are alternately spirally formed on the recording surface in the radial direction of the disc 1. The groove Gr is used as a recording track for recording information, and a land Ld is formed between adjacent grooves Gr. On the plane Ld, a plane pre-pit (hereinafter referred to as "LPP") is formed according to a specified rule. The plane pre-pit LPP in...

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PUM

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Abstract

A tilt detecting device detects and corrects a disc tilt without a dedicated tilt sensor. There is a correlation between an amplitude level of a prepit detection signal and a disc tilt quantity on a disc on which prepits are formed in advance. Namely, the amplitude level of the prepit signal becomes maximum when the disc tilt quantity is zero. Therefore, by controlling a tilt correction quantity such that the amplitude level of the prepit detection signal becomes maximum, the tilt correction can be executed without utilizing a dedicated tilt sensor and the like.

Description

Technical field [0001] The present invention relates to tilt correction in information recording equipment and information reproducing equipment such as optical recording media such as optical discs. Background technique [0002] When information is recorded on the optical disc and information is reproduced from the optical disc, tilt correction is performed. The tilt correction is to correct the tilt angle of the light beam with respect to the information recording surface of the optical disc (hereinafter referred to as "disc tilt"). In the case of performing proper tilt correction, the light beam is irradiated on the optical disk perpendicular to the information recording surface of the optical disk. [0003] In the past, such detection of disc tilt was realized by a dedicated tilt sensor. The tilt sensor is configured to irradiate light exclusively used for disc tilt detection from a light source to the information recording surface of the optical disc and detect the amount of...

Claims

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Application Information

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IPC IPC(8): G11B7/005G11B7/095
CPCG11B7/0956G11B7/0053
Inventor 佐佐木仪央田中久生藤木慎一
Owner PIONEER CORP