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Optical disc device

An optical disc device and optical disc technology, which can be used in beam guiding devices, optical detectors, optical recording heads, etc., and can solve problems such as hindering track control

Inactive Publication Date: 2009-04-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if Figure 8 (a) or Figure 8 As shown in (b), the light reflected by the signal surface other than the recording and reproduction target signal surface becomes disturbance light and is mixed into the tracking error detector, which hinders the normal tracking control and causes off-track or track jump

Method used

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  • Optical disc device
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Examples

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Embodiment Construction

[0037] Refer below Figure 1 to Figure 6 An optical disc device according to one embodiment of the present invention will be described in detail. In addition, the same reference numerals are attached to the same components as those of the above-mentioned conventional optical disc device.

[0038] The optical disc device of this embodiment and figure 1 The optical disc device of the prior art shown has a photodetection substrate 9 and a light source 1 mounted on the photodetection substrate 9 . The light source 1 is, for example, a semiconductor laser or the like. And, this optical disc device is the same as the optical disc device of the prior art, and has collimating lens 4, polarizing holographic substrate 2, 1 / 4 wavelength plate 3 and objective lens 5 on the optical path of the laser light 1a emitted from light source 1. 1 / 4 The wave plate 3 is provided on the back surface of the polarizing hologram substrate 2 . However, the domain structure of the hologram surface 2a ...

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Abstract

Stable tracking with a small control error is performed at the time of reproducing records of a multilayer disc, without being affected by stray light reflected by signal planes other than focusing signal planes. A light splitting element of an optical disc device is provided with first areas (21c-24c) including an optical axis position (20) of light inputted from an objective lens; and second areas (21a-24a, 21b-24b) at positions away from the optical axis in the peripheries of the first areas. A detecting plane (9a) of a photodetector is provided with first detecting areas (97, 98) for detecting incoming light from the first areas; and second detecting areas (95, 96) for detecting incoming light from the second areas. A tracking error signal is detected by the second detecting areas. When the optical disc has a plurality of signal planes, light, which is reflected by the signal planes other than the focusing signal planes and entered the photodetector from the first areas, does not enter the second detecting areas.

Description

technical field [0001] The present invention relates to an optical disc device for recording a signal on an optical disc or for reproducing a signal recorded on the optical disc. Background technique [0002] As a prior art, for example, an optical disc device is disclosed in Japanese Patent Laid-Open No. 2000-132848 (Patent Document 1). use below figure 1 , Figure 7 with Figure 8 Based on this prior art example, a part of it will be modified and described. [0003] figure 1 (a) shows a cross-sectional structure of main parts of an optical disc device of a prior art example. Such as figure 1 As shown in (a), the conventional optical disc device has a photodetection substrate 9 and a light source 1 mounted on the photodetection substrate 9 . The light source 1 is, for example, a semiconductor laser or the like. Also, this optical disc device has a collimating lens 4, a polarizing hologram substrate 2, a 1 / 4 wavelength plate 3, and an objective lens 5 on the optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/095G11B7/13
CPCG11B7/0901G11B2007/0013G11B7/131G11B7/1353
Inventor 西胁青儿百尾和雄麻田润一
Owner PANASONIC CORP
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