JPS5978532U

JPS5978532U - double beam optical head

Info

Publication number: JPS5978532U
Application number: JP17458282U
Authority: JP
Inventors: 正隆伊藤
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1982-11-18
Filing date: 1982-11-18
Publication date: 1984-05-28
Also published as: JPS637952Y2

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図は従来のビームスプリッタを用いた２つのビーム
の合波方法を示す構成図、第２図は従来の偏光ビームス
プリッタを用いた２つのビームの合波方法を示す構成図
、第３図は本考案の一実施例の構成図である。図におい
て１１．１２・・・半導体レーザ、１３．１４・・・コ
リメータレンズ、１５・・・ビームスプリッタ、１６．
３６・・・偏光ビームスプリッタ、３１．３２・・・干
渉フィルタ、３３゜３４・・・１ハ波長板、３５・・・
信号検出系、３７・・・ミラー、３８・・・アクチェー
タ、３９・・・収束レンズ、４０・・・記録媒体、４１
．　４２．　４３．　４４・・・レーザ光、である。Figure 1 is a block diagram showing how to combine two beams using a conventional beam splitter, Figure 2 is a block diagram showing how to combine two beams using a conventional polarizing beam splitter, and Figure 3. 1 is a configuration diagram of an embodiment of the present invention. In the figure, 11.12... semiconductor laser, 13.14... collimator lens, 15... beam splitter, 16.
36...Polarizing beam splitter, 31.32...Interference filter, 33°34...1C wavelength plate, 35...
Signal detection system, 37... Mirror, 38... Actuator, 39... Converging lens, 40... Recording medium, 41
．． 42. 43. 44... Laser light.

Claims

[Scope of utility model registration request]

First and second semiconductor lasers that are arranged opposite to each other and have the same polarization at different oscillation wavelengths, and the spread angles of the first and second emitted light from these first and second semiconductor lasers, respectively. First and second collimators are made to be in an equal state, and the first and second emitted light beams made substantially parallel by these collimators are deflected in directions of approximately +90 degrees and 190 degrees with respect to the traveling direction of the incident light, respectively. a polarizing beam splitter; a reflecting plate for reversing the traveling direction of the polarized second radiated light; and a polarizing direction of the second radiated light from the reflecting plate inserted between the reflecting plate and the polarizing beam splitter. a first 18-wavelength plate that rotates 90 degrees relative to the incident light; a converging optical system that focuses the first and second emitted light from the polarization uniform splitter on a predetermined light projection surface; A second unit that rotates the reflected light from the light projection surface that has passed through the converging optical system by 90 degrees with respect to the polarization direction of the incident light.
a wavelength plate, and first and second wavelength plates that separate the reflected light from the light projection surface and the first and second emitted light, respectively.
and a double beam optical head comprising optical separation means.