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Aberration adjuster, optical pickup, optical information recording medium

A technology for adjusting devices and recording media, applied in the direction of optical recording/reproduction, optical recording head, data recording, etc., which can solve problems such as changes in conditions

Inactive Publication Date: 2008-03-19
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Furthermore, this astigmatism is caused by optical components including LDs (laser diodes), and may change due to temperature, so the occurrence of the above-mentioned problems due to temperature may change.
[0011] Regarding this point, although JP 2000-348371 discloses the technology of controlling the astigmatism in real time according to the wobble signal to adjust the light spot on the optical disc surface, but because it is only based on the wobble signal, it cannot solve the problem as before. topic

Method used

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  • Aberration adjuster, optical pickup, optical information recording medium
  • Aberration adjuster, optical pickup, optical information recording medium
  • Aberration adjuster, optical pickup, optical information recording medium

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Embodiment approach 1

[0052] Next, one embodiment of the present invention will be described as Embodiment 1. FIG. In this embodiment, correction processing is mainly performed on aberration, especially spherical aberration.

[0053] FIG. 3 is a functional block diagram showing an example of the main configuration of the optical disc device 1 according to the present embodiment. In Fig. 3, the optical disc device 1 implements the optical information recording medium device of the present invention, the reference numeral D represents the optical disc, the reference numeral 2 represents the spindle motor, the reference numeral 3 represents the optical pickup, the reference numeral 4 represents the motor driver, the reference numeral 5 represents the read amplifier, and the reference numeral 6 Indicates the servo component for controlling the motor driver 4, the reference numeral 7 represents a DVD decoder, the reference numeral 8 represents an ADIP decoder, the reference numeral 9 represents a laser ...

Embodiment approach 2

[0157] Next, one embodiment of the present invention will be described as Embodiment 2. FIG. In particular, this embodiment mainly performs processing for correcting astigmatism.

[0158] FIG. 7 described in Embodiment 1 is a diagram of a waveform of a push-pull signal using a signal whose high-frequency components are cut by a low-pass filter in groove tracking or the like.

[0159] Ideally, the RF amplitude value of the optical pickup is the maximum when the focus signal is zero, the error rate of the information signal is the minimum, and the signal obtained from the wobble signal and the LPP signal is also the best.

[0160] Therefore, as an optical disk device, for example, the focus position is vibrated within the range of ±0.5 μm, the RF signal amplitude at this time is measured by an internal circuit, and the internal CPU performs approximation and other processing to find the focus position at which the RF signal amplitude value is the maximum value. , control is per...

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Abstract

An optical pickup generates spherical aberration in a laser light emitted from a semiconductor laser becoming a light source by moving, in the direction of the optical path, a collimate lens. A control signal generating section acquires the reproduction signal (RF signal) of information from the light reflected off an optical disc and acquires a groove-like signal (wobble signal, LPP signal) corresponding to the shape of the guide groove in the optical disc. When the spherical aberration is adjusted based on the RF signal and the wobble signal or the LPP signal, an appropriate S / N can be sustained for both the signal obtained from the groove and the information signal even when astigmatism is present in a light spot.

Description

technical field [0001] The present invention relates to a preferred aberration adjustment device for recording or reproducing information in an optical information recording medium such as a DVD, an optical pickup, an optical information recording medium device, a program, a storage medium, and an aberration adjustment method. Background technique [0002] Japanese Unexamined Patent Application Publication No. 2000-348371 discloses a technique of controlling astigmatism in real time according to a wobble signal to adjust a light spot on an optical disk surface. [0003] On the optical disk for recording, in order to represent the address information on the synchronous information (synchronous pattern) and the disk, wobble (serpentine groove) 110 and pre-stage pit (land pre-pit) (LPP) 111 etc. as shown in FIG. 1 are formed. (Also, reference numeral 112 denotes a groove, reference numeral 113 denotes a land, and reference numeral 114 denotes a pit). When observed microscopica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/125G11B7/135G11B7/1369G11B7/1376G11B7/1392
Inventor 秋山洋
Owner RICOH KK