Reproducing apparatus and reproducing method

A reproducing device, a technology of reference light, applied in the directions of digital recording/reproduction, optical recording/reproduction, instruments, etc., can solve the problems of errors and reduce the amount of signal light at the same time, and achieve the effect of increasing the recording capacity

Active Publication Date: 2015-02-11
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, when reproducing a multi-layer optical disc, there is a high possibility that the amount of signal light decreases and errors occur while reading the signal

Method used

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  • Reproducing apparatus and reproducing method
  • Reproducing apparatus and reproducing method
  • Reproducing apparatus and reproducing method

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Embodiment Construction

[0021] The embodiments described hereinafter are preferred specific examples of the present disclosure and are limited in various ways which are technically preferable. However, the scope of the present disclosure is not limited to these embodiments unless it is intended to limit the present disclosure.

[0022] The present disclosure will be described according to the following order.

[0023] 1. About the homodyne detection method in the prior art

[0024] 2. Examples of detection methods

[0025] 3. Implementation method

[0026] 4. Modification

[0027] 1. About the homodyne detection method in the prior art

[0028] Before describing the reproduction method of the embodiment of the present disclosure, a homodyne detection method in the related art will be described. Hereinafter, a homodyne detection method using a so-called phase diversity system will be described as an example.

[0029] Four sets of signal beams and reference beams whose phase differences are 90° f...

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Abstract

Provided is a reproducing apparatus including: an optical system that obtains a signal light by radiating light emitted from a light source and generates a reference light from the light emitted from the light source, with respect to a recording medium, and that generates first to fourth groups of the signal light beams and the reference light beams, with respect to the superposed light in which the signal light and the reference light are superposed onto each other; a light receiving unit that receives light beams of the first to fourth groups of the signal light beams and the reference light beams respectively through first to fourth light receiving elements; and a reproduction signal generation circuit that calculates a first differential signal and a second differential signal, and that generates a reproduction signal by performing an arithmetic operation using the first and second differential signals.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Japanese Priority Patent Application JP2013-157674 filed on Jul. 30, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to a reproducing apparatus and a reproducing method applied to reproducing an optical medium such as an optical disc. Background technique [0004] For example, when reproducing a multilayer optical disc, there is a high possibility that the signal light amount decreases and errors occur while reading the signal. There is a homodyne detection system that amplifies a detection signal using light interference (refer to Japanese Unexamined Patent Application Publication No. 2008-269680 and Japanese Unexamined Patent Application Publication No. 2008-65961 No). [0005] In Japanese Unexamined Patent Application Publication No. 2008-269680 or Japanese Unexamined Patent Application Publicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/005G11B7/24094
CPCG11B20/10398G11B7/125G11B20/10046G11B7/005G11B20/10462G11B7/2407G11B20/10009G11B7/00718G11B7/1365G11B7/1395
Inventor 齐藤公博关口浩司
Owner SONY CORP
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