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Optical information reproducing apparatus

A regeneration device and optical information technology, applied in information storage, recording information storage, optical recording head, etc., can solve the problems of the detection signal S/N ratio reduction, the inability to fully ensure the reproduction signal S/N ratio, etc., and achieve the effect of signal amplification high effect

Inactive Publication Date: 2012-01-11
HITACHI CONSUMER ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the S / N ratio of the detection signal from each recording layer decreases.
[0004] In addition, when laser light is irradiated to a multi-layer disc, multiple layers are irradiated at the same time, so the S / N ratio of the detection signal is lowered due to reflection stray light from recording layers other than the target layer for reproducing information, that is, interlayer crosstalk.
[0005] However, due to the need to increase the capacity of optical disks and increase the speed of reproduction such as video, the data transmission speed is also increasing, so that the existing technology cannot sufficiently ensure the S / N ratio of the reproduced signal.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] figure 1 It is a diagram showing an example of the overall configuration of an optical information recording and reproducing apparatus for realizing the optical signal detection method of the present invention.

[0046] [Overall structure of optical information recording and reproducing device]

[0047] The optical information recording and reproducing apparatus 1 includes an optical pickup 101 and a rotary motor 102 , and the optical information recording medium 103 can be rotated by the rotary motor 102 .

[0048] The optical pickup 101 plays a role of irradiating light onto the optical information recording medium 103 to record and / or reproduce digital information. The reproduced light detected by the optical pickup 101 is input to the signal processing circuit 105 after current-voltage (IV) conversion. A reproduction signal or a servo signal is generated by the signal processing circuit 105 and sent to the controller 104 .

[0049] The controller 104 controls the...

Embodiment 2

[0103] In this embodiment, an example of an optical information recording and reproducing apparatus that implements an optical signal detection method that detects not only focus error signals but also tracking error signals from the photodetectors 224, 225, 226, and 227 will be described. In addition, regarding the optical information recording and reproducing apparatus 1 and the optical pickup 101 in this embodiment, descriptions are given and given. figure 1 , figure 2 The description of the parts with the same symbols and the same functions will be omitted.

[0104] Figure 9 It is a diagram showing another example of the structure of the light splitting element 232 of the optical pickup 101 in the optical information recording and reproducing apparatus 1 . The light splitting element 232 is bounded by a relatively small diameter 502 relative to the diameter of the incident light beam 501 , so that the directions of the diffraction gratings are different in the inner re...

Embodiment 3

[0111] In Embodiments 1 and 2, the case where the astigmatism method is used as the focus error signal detection method is shown, but in this embodiment, an example of an optical information recording and reproducing apparatus using the branch-and-edge method will be described. When using the astigmatism method in the optical pickup 101, as figure 2 Cylindrical lenses 233, 234 are configured as shown, but are not required when using the prism method. In addition, at this time, the photodetectors 224 , 225 , 226 , and 227 are arranged at the focal positions of the condensing lenses 220 , 221 .

[0112] Figure 12 It is a diagram showing another example of the structure of the light splitting element 232 of the optical pickup 101 in the optical information recording and reproducing apparatus 1 . The spectroscopic element 232 sets a boundary with a relatively small diameter 502 relative to the diameter of the incident light beam 501, and divides its inner region into upper and...

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Abstract

A light beam emitted from a laser source is divided into a first light beam and a second light beam. An optical divider is further provided to separate a combined light beam of the first and second light beams into a first light bundle near the optical axis and a second light bundle in the edge portion and to diverge the first and second light bundles so that the first and second light bundles are individually detected by plural detectors. The first light beam is signal light focused on an optical information recording medium by an objective lens and reflected off the medium, and the second light beam is reference light not focused on the optical information recording medium. A focus error signal is then detected for the first light bundle for compensating focus error.

Description

technical field [0001] The present invention relates to realizing high S / N of reproduction signals of optical information reproduction devices. Background technique [0002] Regarding optical discs, blue semiconductor lasers and Blu-ray Discs (Blue-ray Disk) using a high NA objective lens of NA0.85 have been commercialized, and the resolution of the optical system has almost reached the limit, and it is expected that the future recording layer The multilayer technology becomes effective. In recent years, two-layer Blu-ray discs with recording layers having an interlayer interval of 25 μm have been marketed and used as image storage media for recorders (recoders) or data storage media for personal computers. [0003] In such a multi-layer optical disc, it is necessary that the amount of detection light from each recording layer is substantially the same, and therefore, as the number of recording layers increases, the reflectance from a specific recording layer must be reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/13G11B7/09
CPCG11B2007/0013G11B7/131G11B7/1356G11B7/0908
Inventor 井手达朗
Owner HITACHI CONSUMER ELECTRONICS CORP
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