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Optical pickup device and optical disc apparatus using the same

一种光拾取装置、光盘的技术，应用在光束引导装置、光学记录头、头的配置/安装等方向，能够解决信号抖动成分放大、难以得到高品质的记录或再现品质、干扰成分漏入DPP信号等问题，达到高品质信号检测的效果

Inactive Publication Date: 2011-07-27
HITACHI MEDIA ELECTORONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned structure, it is necessary to amplify the signal for the tracking error signal of the DPP method by about 10 times, and there are disturbances such as signal jitter components caused by traces of stray light remaining without complete separation, and damage or stains. Subjects with greatly magnified components
As a result, the amplified noise components will leak into the DPP signal, making it difficult to obtain stable high-quality recording or reproduction quality

Method used

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  • Optical pickup device and optical disc apparatus using the same
  • Optical pickup device and optical disc apparatus using the same
  • Optical pickup device and optical disc apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 It is a schematic configuration diagram showing an example of the optical pickup device according to the first embodiment of the present invention. The laser beam 2 emitted from the laser source 1 is changed in the forward direction by the polarizing beam splitter 3, passes through the collimating lens 5 driven by the stepping motor 4 and can correct the spherical aberration of the incident beam, and polarized components perpendicular to each other The 1 / 4 wavelength plate 6 that imparts a phase difference of 90 degrees is focused by the objective lens 7 on a predetermined recording layer in the optical disc 8 .

[0037] The reflected light beam from the optical disc 8 passes through the objective lens 7 again, passes through the 1 / 4 wavelength plate 6, the polarizing beam splitter 3, and the light beam is divided into multiple light beams by the beam splitting element 10, and then enters the photodetector 11. Among them, the objective lens 7 is preferably ins...

Embodiment 2

[0107] use Figure 6 A second embodiment will be described. In this embodiment, compared with the first embodiment, by using a beam splitting element that is easier to manufacture, the mass production manufacturing error of the above-mentioned beam splitting element is suppressed, and the performance of the single element is stabilized, thereby realizing an optical pickup device. Yield improvement and cost reduction.

[0108] The optical system structure of the optical pick-up device in the present embodiment, for example can be with figure 1 The shown optical pickup device has the same structure. The difference from the first embodiment is the structure of the beam splitting element 10 and the photodetector 11 . Therefore, the structure of the photodetector 11, which is the main part of the second embodiment, is placed in Figure 6 expressed and explained.

[0109] In the optical system structure of the first embodiment, the pitch of the diffraction grating in the diffra...

Embodiment 3

[0133] Next, use Figure 7 and Fig. 8 illustrate a third embodiment. In this embodiment, compared with the first embodiment, the number of current-voltage conversion amplifiers used for information reproduction signal detection is reduced, and an optical pickup device capable of detecting high-quality information reproduction signals with less noise components is provided. .

[0134] The optical system structure of the optical pick-up device in the present embodiment, for example can be with figure 1The optical pickup shown has the same structure. The difference from the first embodiment is the structure of the beam splitting element 10 and the photodetector 11 . Therefore, the structure of the beam splitting element 10 and the photodetector 11, which are the main parts of the third embodiment, are Figure 7 and Figure 8A Indicated respectively.

[0135] The configuration of the beam splitting element may be the same as that of the conventional beam splitting element de...

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Abstract

The present invention discloses an optical pickup device and optical disc apparatus using the same, which reduces the change caused to the detection signals by spread light from a multi-layered disc to record or re-display high quality discs. According to the present invention, of all beams of light reflected from the optical disc, only light in a peripheral region excluding a push-pull region is used to generate a DPD signal. In this method of signal generation that optimizes internal light-receiving surface interconnections in a photodetector, the lens error signal required for the generation of a tracking error signal in the DPP scheme is amplified at a lower amplification factor. In addition, the light reflected from the multilayered optical disc will be divided into a plurality of regions and the divided beam of light will be focused at different positions on the photodetector. When the beam is focused upon a desired layer, stray light from recording layers other than those to be subjected to information reproduction will not enter the photodetector light-receiving surfaces used for servo signals.

Description

technical field [0001] The present invention relates to an optical pickup device and an optical disc device. Background technique [0002] As background art in this technical field, there is, for example, Japanese Patent Laid-Open No. 2006-344344 (Patent Document 1). This gazette describes "obtaining a desired signal with high precision from an optical disc having a plurality of recording layers". In addition, there is, for example, Japanese Patent Laid-Open No. 2006-344380 (Patent Document 2). This gazette states "Even when a recordable optical storage medium having two information recording surfaces is used, a tracking error signal with less offset is detected". Furthermore, for example, Non-Patent Document 1 describes "arranging a tracking photodetector in an area where there is no stray light in other layers", and this structure is also described in Japanese Patent Application Laid-Open No. 2004-281026 (Patent Document 3). [0003] In addition, there is, for example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/135
CPCG11B7/13925G11B7/0916G11B7/0943G11B7/0906G11B7/0912G11B7/1365G11B7/1353
Inventor 中村俊辉中井伸郎木村茂治
Owner HITACHI MEDIA ELECTORONICS CO LTD