JPS5960736U

JPS5960736U - light detector

Info

Publication number: JPS5960736U
Application number: JP15496782U
Authority: JP
Inventors: 大門　正博
Original assignee: 三菱電機株式会社
Priority date: 1982-10-13
Filing date: 1982-10-13
Publication date: 1984-04-20

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 the drawing]

第１図は従来の回折格子を１個用いたトラッキングサー
ボセンサ方式の説明図であり、第２図は記録媒体上のト
ラックと光スポットの関係を示す説明図、第３図は従来
のサーボ方式で用いられている光検知器を示す構成図で
ある。また第４図は、回折格子を２個用いたトラッキン
グサーボセンサ方式の説明図であり、第５図は、トラッ
クと光スポットの関係を示す説明図、第６図はこの考案
の一実施例を示す構成図で、回折格子を２個用いたトラ
ッキングサーボセンサ方式で用いられる光検知器である
。図において、３０は光検知器、３１は第１の光検知素子
、３２は第２の光検知素子、３３は第３の光検知素子、
３４は第４の光検知素子、３５は第５の光検知素子を示
す。尚、図中、同一符号は同一、又は相当部分を示す。第３図第４図　　　−Fig. 1 is an explanatory diagram of a conventional tracking servo sensor method using one diffraction grating, Fig. 2 is an explanatory diagram showing the relationship between a track on a recording medium and a light spot, and Fig. 3 is an explanatory diagram of a conventional servo sensor method using a single diffraction grating. 1 is a configuration diagram showing a photodetector used in the. Fig. 4 is an explanatory diagram of a tracking servo sensor system using two diffraction gratings, Fig. 5 is an explanatory diagram showing the relationship between a track and a light spot, and Fig. 6 is an explanatory diagram of an embodiment of this invention. This is a configuration diagram showing a photodetector used in a tracking servo sensor method using two diffraction gratings. In the figure, 30 is a photodetector, 31 is a first photodetector element, 32 is a second photodetector element, 33 is a third photodetector element,
34 is a fourth photodetecting element, and 35 is a fifth photodetecting element. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Figure 3 Figure 4 -

Claims

[Scope of utility model registration request]

(1) The independent photodetecting elements are arranged in the order of the first photodetecting element, the second photodetecting element, the third photodetecting element, the fourth photodetecting element, and the fifth photodetecting element. A photodetector characterized in that the third photodetecting element is arranged and formed by being divided into a plurality of photoelectric conversion surfaces.

(2) Either an element group consisting of a first photodetecting element and a second photodetecting element or an element group consisting of a fourth photodetecting element and a fifth photodetecting element The photodetecting element constituting the third photodetecting element is for detecting an optical signal for tracking a light beam incident on the third photodetecting element, as set forth in claim 1 of the utility model registration claim. Photodetector.