JPS59138025U

JPS59138025U - optical recording and reproducing device

Info

Publication number: JPS59138025U
Application number: JP3236783U
Authority: JP
Inventors: 義治田中
Original assignee: 萬世工業株式会社
Priority date: 1983-03-07
Filing date: 1983-03-07
Publication date: 1984-09-14

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は光検出素子の従来例を示す説明図、第２図は本
考案の光検出素子の第１実施例を示す説明図、第３図は
本考案の光学系の一実施例を示す説明図、第４図は情報
トラックとビームスポットとの関係を示す説明図、第５
図と第６図は第１実施例における光検出素子と光スポッ
トとの関係を示す説明図であり、第５図はビームスポッ
トが適正状態にある場合を、第６図はビームスポットが
焦点ずれ及びトラッキングずれを生じた場合を示し、第
７図は本考案の光検出素子の第２実施例を示す説明図、
第８図は本考案の光検出素子の第３実施例を示す説明図
、第９図は本考案の光検出素子の第４実施例を示す説明
図を示す。１・・・光検出素子、ｌａ、　　ｌｂ、　　ｌｃ、　　
ｌｄ、　　ｌｅ。１ｆ・・・受光面、５・・・光ビーム、１０・・・情報
トラック、１１・・・ディスク、１４・・・光スポット
、Ａ・・・情報トラック方向と平行な分割線、Ｂ・・・
情報トラック方向、Ｃ・・・光学系、Ｑ・・・光スポッ
トの中心。Fig. 1 is an explanatory diagram showing a conventional example of a photodetecting element, Fig. 2 is an explanatory diagram showing a first embodiment of the photodetecting element of the present invention, and Fig. 3 is an explanatory diagram showing an embodiment of the optical system of the present invention. Explanatory diagram, Figure 4 is an explanatory diagram showing the relationship between the information track and the beam spot, and Figure 5 is an explanatory diagram showing the relationship between the information track and the beam spot.
6 and 6 are explanatory diagrams showing the relationship between the photodetecting element and the light spot in the first embodiment. FIG. 5 shows the case where the beam spot is in a proper state, and FIG. 6 shows the case where the beam spot is out of focus. FIG. 7 is an explanatory diagram showing a second embodiment of the photodetecting element of the present invention;
FIG. 8 is an explanatory diagram showing a third embodiment of the photodetecting element of the present invention, and FIG. 9 is an explanatory diagram showing a fourth embodiment of the photodetecting element of the present invention. 1... Photodetection element, la, lb, lc,
ld, le. 1f... Light receiving surface, 5... Light beam, 10... Information track, 11... Disk, 14... Light spot, A... Partition line parallel to the information track direction, B...・
Information track direction, C: optical system, Q: center of light spot.

Claims

[Scope of utility model registration request]

A light beam irradiated onto a disk forming an information track is irradiated via an optical system onto a photodetecting element having a plurality of light receiving surfaces as a light spot whose center does not move. In an optical recording/reproducing device that detects a tracking deviation signal of a light beam to an information track and a defocus signal to a disk, the light-receiving surface of the photodetecting element is perpendicular to the information track direction and at a central portion. The light spot is divided into at least three parts so that the center of the light spot is located on the dividing line, and the light spot is divided into at least two parts so that the center of the light spot is located parallel to the information track direction and on the dividing line, and the received light is divided into at least three parts. Inside the plane,
A defocus signal is detected from the output generated from the difference between the amount of light received by the central light-receiving surface and the sum of the amounts of light received by the light-receiving surfaces arranged on both sides, and the amount of light received by at least two light-receiving surfaces is detected. An optical recording/reproducing device characterized in that a tracking deviation signal is detected from a difference output generated by the difference, and an information signal is further detected from a sum of outputs from all light receiving surfaces.