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Laser power controller and optical disk device

A technology for an optical device and an identification device, which is applied to the optical reproduction system, beam source, optical recording head, etc., can solve the problem that the device cannot record properly, and achieve the effect of improving the processing speed and omitting the inspection operation.

Inactive Publication Date: 2005-06-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] In summary, in the conventional device structure, in recording data on DVD-RAM, there are deflection caused by defects or dirt such as fingerprints, scratches, etc. on the substrate of the disc, or by vibration / shock outside the optical head. Defocus causes problems where the device cannot perform recording properly

Method used

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  • Laser power controller and optical disk device
  • Laser power controller and optical disk device
  • Laser power controller and optical disk device

Examples

Experimental program
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Embodiment 1

[0054] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

[0055] Fig. 1 shows a block diagram of an optical disc recording / reproducing apparatus of the present invention. In FIG. 1, elements 1 to 15 have the same structure as the conventional structure, and thus the description thereof is omitted.

[0056] Reference numeral 16 denotes an amplifier / filter for extracting the wobble signal component from the tracking error signal output from the reproduction signal / servo signal detection circuit 4; reference numeral 17 denotes an amplifier / filter for detecting the wobble signal as the output signal of the amplifier / filter 16 Amplitude envelope detection circuit; reference numeral 18 represents a bias voltage generating circuit for generating a target voltage using the output of the envelope detection circuit; reference numeral 19 represents a bias voltage generating circuit for outputting a predetermined algorithm from the bias vo...

Embodiment 2

[0070] image 3 Example 2 of the present invention is shown in.

[0071] image 3 Reference numeral 101 denotes a motor; reference numeral 102 denotes an optical disc; reference numeral 103 denotes an optical head for converting reflected light from the disc into an electrical signal and outputting the signal to the reproduction signal / servo signal detection circuit 104; reference numeral 104 indicates a regeneration signal / servo signal detection circuit for generating a regeneration signal, a focus error signal, a tracking error signal 1 and a tracking error signal 2 from the output signal obtained from the optical head 103; reference numeral 105 indicates a circuit for using the regeneration signal / The servo signal of the servo signal detection circuit 104 controls the optical head 103, controls the motor 101, and informs the reference value generator 117 about the focus / tracking control device of the polarity of the track currently being scanned; reference numeral 106 indica...

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Abstract

A power control component for controlling the power of a light source of a light beam directed onto an optical medium. The power control unit comprises: a reflected light detector for detecting light reflected from the optical medium when irradiated by the light beam of the tracking track; for calculating the transmittance or transmittance of the light transmitted from the disc surface onto the recording layer from the reflected light an arithmetic unit for the amount of directional light on the recording layer of the medium; and power control means for controlling the power of the emitting light source based on a calculation result obtained by the arithmetic unit.

Description

Technical field [0001] The present invention relates to a laser power control unit for recording / reproducing a digital disc and an optical disc device using the laser power control unit, and to a laser power control unit for controlling laser power and an optical disc device using the laser power control unit. Background technique [0002] In a recordable / reproducible DVD-RAM disc, the inside of the disc is divided into multiple bands. The number of revolutions is constant in each belt, but is different between different belts. Usually, this system is called band CLV. Each band is divided into a plurality of sectors, and each sector is placed in an address area where the address of the sector has been previously recorded by a data recording area in which information can be recorded. Another feature of this system is that the data recording area can extend on both the groove guide area (hereinafter referred to as "groove") and the area between the groove guide area (hereinafter re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/0045G11B7/005G11B7/0055G11B7/006G11B7/007G11B7/125
CPCG11B7/0045G11B7/0053G11B7/0055G11B7/0062G11B7/00718G11B7/126G11B7/1263G11B19/02
Inventor 井口睦古宫成宫端佳之久门裕二宫崎笃史赤木俊哉
Owner PANASONIC CORP