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Optical disc recording/reproducing apparatus

A reproducing device and optical disc recording technology, which is applied in digital recording/reproduction, optical recording/reproduction, data recording, etc., and can solve servo system malfunction, inability to guarantee the time for offset correction, uncertain information recording, etc. question

Inactive Publication Date: 2008-01-23
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, when requesting an increase in recording speed (referred to as "n times" relative to the reproduction time) or reproducing recorded information during a recording operation, the time for correcting the offset may not be guaranteed
This can cause malfunctioning of the servo system and can cause serious problems such as indeterminate information logging

Method used

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  • Optical disc recording/reproducing apparatus
  • Optical disc recording/reproducing apparatus
  • Optical disc recording/reproducing apparatus

Examples

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Embodiment Construction

[0028] Embodiments of the present invention will be explained below with reference to the drawings.

[0029] FIG. 1 is a schematic diagram showing an example of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

[0030] As shown in FIG. 1, an optical disc recording / reproducing apparatus 1 includes an optical head 2 for irradiating a light beam having a specified wavelength to a recording surface of a recording medium M. As shown in FIG. The optical head 2 is connected to an APC (Automatic Power Control) circuit 3 included in the optical head 2 and which controls the amount of output light of a semiconductor laser diode (to be described below) to output a light beam having a specified wavelength. The optical head 2 is also connected to a signal processor 4 which controls the position of the optical head 2 to have a specified relationship with the recording surface of the recording medium M to read the pre-recorded information o...

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Abstract

An optical disc recording / reproducing apparatus (1) according to the present invention has a CPU (5) which holds the largeness of a driving current supplied from a LD driving circuit (36) to a laser diode (11) in a sample hold circuit (33) of an APC circuit (3), interrupts a driving signal supplied from the LD driving circuit to the laser diode, and outputs the driving current of the largeness held in the sample hold part from the LD driving circuit to the laser diode at the end of offset correction by an offset correction mechanism, when an offset is detected by offset detectors (54, 67), and an offset is corrected by offset correction mechanisms (63, 66), thereby improving the tracking performance of the servo system and enabling stable control without a malfunction.

Description

technical field [0001] The present invention relates to an optical disc recording / reproducing apparatus (information recording / reproducing apparatus) which records, reproduces and erases information on / from an optical disc capable of recording, reproducing and erasing information by using a laser beam. Background technique [0002] As a recording medium suitable for recording information, an optical disc is widely used. Various optical discs of different standards are proposed and used. These optical discs are classified as CDs and DVDs according to their recording capabilities. Depending on usage, these optical discs are divided into read-only type (called ROM) that contains pre-recorded information, write-once type (called -R) that can record information only once, and reusable type that can record and erase information repeatedly. Write type (called RAM or RW). [0003] An optical disc recording / reproducing apparatus for recording information on optical discs of the ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B20/10
CPCG11B7/094G11B7/0945G11B7/09
Inventor 近良孝马笼贵弘
Owner KK TOSHIBA
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