JPS59153630U - optical playback device - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

、第１図は従来の光学式再生装置を示す配置図、第２図
は第１図の光学式再生装置の光検出器の構成を示す配置
図、第３図及び第４図は従来の他の光学式再生装置を示
す配置図、第５図は本考案による光学式再生装置の一実
施例を示す配置図、第６図は第５図の光学式再生装置の
光検出器の構成を示す配置図、第７図は光検出器上のビ
ームスポットの配置を示す線図、第８図は光学式ディス
ク上のスポットの配置を示す線図、第９図は本考案によ
る光学式再生装置の他の実施例を示す配置図、第１０図
は第９図の光学式再生装置の光検出器の構成を示す配置
図、第１１図は光検出器上のスポットの配置を示す線図
である。 ４１及び５１は光源、４２ａ５４ａは第１の回折格子、
４２ｂ、５４ｂは第２の回折格子、４８゜６３は光学式
記録媒体、５０．６５は光検出器である。, FIG. 1 is a layout diagram showing a conventional optical reproducing device, FIG. 2 is a layout diagram showing the configuration of a photodetector of the optical reproducing device shown in FIG. 1, and FIGS. 3 and 4 are layout diagrams showing a conventional optical reproducing device. FIG. 5 is a layout diagram showing an embodiment of the optical reproducing device according to the present invention, and FIG. 6 shows the configuration of a photodetector of the optical reproducing device of FIG. 5. 7 is a diagram showing the arrangement of the beam spot on the photodetector, FIG. 8 is a diagram showing the arrangement of the spot on the optical disc, and FIG. 9 is a diagram showing the arrangement of the beam spot on the optical disc. FIG. 10 is a layout diagram showing the configuration of the photodetector of the optical reproducing device of FIG. 9, and FIG. 11 is a diagram showing the arrangement of spots on the photodetector. . 41 and 51 are light sources, 42a54a is a first diffraction grating,
42b and 54b are second diffraction gratings, 48.63 is an optical recording medium, and 50.65 is a photodetector.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 光源よりのビームが入射せしめられる所定格子間角度を
以って配された第１及び第２の回折格子と、該第１及び
第２の回折格子によって分割された複数のビームを光学
式記録媒体に入射させて得られた複数の出射ビームが入
射せしめられる複数の光検出部から成る光検出器とを有
し、該光検出器から上記第１の回折格子によって分割さ
れた複数のビームに基づいた上記光学式記録媒体上の複
数のトラック部に対応する複数の再生信号及び上記第２
の回折格子によって分割された複数のビームに基づいた
一対の差動トラッキング誤差信号を得る様にしてなる光
学式再生装置。First and second diffraction gratings arranged at a predetermined angle between the gratings on which the beam from the light source is incident, and a plurality of beams split by the first and second diffraction gratings, and an optical recording medium. and a photodetector consisting of a plurality of photodetectors into which a plurality of output beams obtained by making the beams incident on the photodetector are incident, and based on the plurality of beams split from the photodetector by the first diffraction grating. a plurality of reproduction signals corresponding to a plurality of track portions on the optical recording medium and the second
An optical reproducing device configured to obtain a pair of differential tracking error signals based on a plurality of beams split by a diffraction grating.