JPS58127431U

JPS58127431U - Information recording and reproducing device

Info

Publication number: JPS58127431U
Application number: JP2211782U
Authority: JP
Inventors: 竹村　治彦; 喜一加藤; 坂本　正治
Original assignee: オリンパス光学工業株式会社
Priority date: 1982-02-20
Filing date: 1982-02-20
Publication date: 1983-08-29

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図は本考案の情報記録再生装置の要部の一例の構成
を一部断面で示す平面図、第２図は第１図の部分断面図
、第３図は記録媒体上での記録用ビームスポットと再生
用ビームスポットとの相対的位置関係を示す線図、第４
図は第１図に示す第２の光検出器の構成およｉその処理
回路の構成る示す線図、第５図は本考案の情報記録再生
装置の　　　他の例の要部の構成を示す平面図である。１・・・ピックアップ台、２・・・記録用半導体レーザ
、３・・・再生用半導体レーザ、４・・・保持部材、５
・・・基台、６，７・・・コリメートレンズ、８・・・
整形プリズム、９・・・グレーティング、１０・・・合
成プリズム、？ＯＡ・・・光学面、ＩＯＢ・・・反射面
、１１，１５゜２１・・・レンズ、１２・・・偏光ビー
ムスプリッタ、１３．１４，１６，２２．２４・・・全
反射ミラー、１７・・・％波長板、１８・・・対物レン
ズ、１９・・・光ディスク、２０・・・対物レンズ駆動
装置、２３・・・シリンドリカルレンズ、２５・・・全
反射プリズム、２６・・・第１の光検出器、２７・・・
第２の光検出器、２８　　　、。 −１〜２Ｂ−４，２９−１，２９−２・・・受光領域、
３０−１〜３０−３・・・加算器、３１−１．３１−２
・・・差動増幅器、３２・・・保持装置、３３．３４・
・・光学部材。５Ｂ−ｔＯ− １５−へ。５８−３−ＣＩＩ・Fig. 1 is a plan view partially showing the structure of the main part of the information recording/reproducing device of the present invention, Fig. 2 is a partial sectional view of Fig. 1, and Fig. 3 is a plan view showing the structure of an example of the main part of the information recording/reproducing device of the present invention. Diagram showing the relative positional relationship between the beam spot and the reproduction beam spot, 4th
The figure shows a diagram showing the configuration of the second photodetector shown in FIG. 1 and the configuration of its processing circuit, and FIG. 5 shows the configuration of main parts of another example of the information recording and reproducing apparatus of the present invention. FIG. DESCRIPTION OF SYMBOLS 1...Pickup stand, 2...Semiconductor laser for recording, 3...Semiconductor laser for reproduction, 4...Holding member, 5
...Base, 6,7...Collimating lens, 8...
Shaping prism, 9...Grating, 10...Synthesizing prism,? OA...Optical surface, IOB...Reflecting surface, 11,15°21...Lens, 12...Polarizing beam splitter, 13.14,16,22.24...Total reflection mirror, 17. ...% Wave plate, 18... Objective lens, 19... Optical disk, 20... Objective lens drive device, 23... Cylindrical lens, 25... Total reflection prism, 26... First Photodetector, 27...
a second photodetector, 28; -1 to 2B-4, 29-1, 29-2... light receiving area,
30-1 to 30-3...Adder, 31-1.31-2
... Differential amplifier, 32 ... Holding device, 33.34.
...Optical components. 5B-tO- 1 to 5-. 58-3-CII ・

Claims

[Scope of utility model registration request]

In an apparatus that includes a recording light source and a reproducing light source, and records and reproduces information by converging the light flux from these light sources onto a recording medium through one common objective lens, the recording light source and the reproducing light source are connected to a common objective lens. while being held by a holding member, the light beam from one light source is incident at an angle equal to or greater than S' critical angle,
An optical member is provided that has an optical surface on which the light flux from the other light source enters at an incident angle that makes the reflectance sufficiently small, and the light flux from one light source reflected by the optical surface of this optical member and the optical surface are An information recording and reproducing apparatus characterized in that the information recording and reproducing apparatus is configured to guide a light beam from the other light source that is refracted and transmitted to the objective lens.