JPS60132623U

JPS60132623U - optical head

Info

Publication number: JPS60132623U
Application number: JP1628684U
Authority: JP
Inventors: 和男野田
Original assignee: フオスタ−電機株式会社
Priority date: 1984-02-08
Filing date: 1984-02-08
Publication date: 1985-09-04

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

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

第１図は従来の光学ヘッドの構成図、第２図は本考案の
一実施例を示す構成図、第３図乃至第５図はそれぞれ本
考案の他の実施例を示す構成図である。１・・・半導体レーザ素子、３・・・回折格子（光学素
子）、４・・・ビームスプリッタ、７・・・コリメータ
レンズ、９・・・集束レンズ、１０・・・ディスク、１
３・・・受光レンズ、１４・・・受光素子、１５・・・
モニタ用受光素子、１６・・・制御回路。FIG. 1 is a block diagram of a conventional optical head, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIGS. 3 to 5 are block diagrams showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Semiconductor laser element, 3... Diffraction grating (optical element), 4... Beam splitter, 7... Collimator lens, 9... Focusing lens, 10... Disk, 1
3... Light receiving lens, 14... Light receiving element, 15...
Monitor light receiving element, 16...control circuit.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

半導体レーザ素子の出力光を光分離手段に入射させて２
方向に分離し該分離光の一方を対物レンズを介して記録
媒体に照射すると共に、該記録媒体での反射光を前記光
分離手段を介して受光素子に導き、前記記録媒体に書き
込まれた記録情報の読取、消去又は前記記録媒体への情
報の書込みの小なくとも１つを行う光学ヘッドにおいて
、前記半導体レーザ素子の出力光の他方の分離光を受光
するモニタ用受光素子と、該モニタ用受光素子の出力が
所定の値になるように前記半導体レーザ素子加力光の大
きさを制御する制御手段とを設けたことを特徴とする光
学ヘッド。The output light of the semiconductor laser element is made incident on the light separation means, and the
One of the separated lights is irradiated onto a recording medium through an objective lens, and the reflected light on the recording medium is guided to a light receiving element through the light separating means, thereby recording information written on the recording medium. In an optical head that performs at least one of reading and erasing information or writing information on the recording medium, a monitor light receiving element that receives the other separated light of the output light of the semiconductor laser element; 1. An optical head comprising: control means for controlling the magnitude of the light applied to the semiconductor laser element so that the output of the light receiving element becomes a predetermined value.