KR950020509A

KR950020509A - Optical system for optical pickup

Info

Publication number: KR950020509A
Application number: KR1019930030441A
Authority: KR
Inventors: 임영빈
Original assignee: 김주용; 현대전자산업 주식회사
Priority date: 1993-12-28
Filing date: 1993-12-28
Publication date: 1995-07-24
Also published as: CN1112707A

Abstract

본 발명은 광을 이용하여 디스크상에 정보를 기록하거나 디스크상에 기록된 정보를 재생시키는 광픽업(PICK-UP)장치에서 상기 광픽업의 광학계 구성을 간소화하여 장치의 소형화를 기할 수 있도록 한 픽업용 광학계에 관한 것으로, 이는 빛을 발생시키는 레이저 다이오드(1)와, 상기 레이저 다이오드(1)에서 발생된 빛을 3개의 빔(BEAM)으로 분리시키는 격자(GRATING)(2)와, 상기 격자(2)에 의해 분리된 레이저 다이오드 발산광을 평행하게 집속시키는 시준기 렌즈(3)와, 상기 시준기 렌즈(3)의 평행광을 디스크(5)에 집속되는 대물렌즈(OBJECTIVE LENS)(4)와, 상기 시준기 렌즈(3)와 격자(2)사이에 위치되어 디스크(5)를 거쳐 나오는 광정보를 반사시키는 편광광속분리기(POLARIZED BEAM SPLITTER)(11)와, 상기 편광광속분리기(11)에 의해 반사되어 경로가 변환된 광이 통과할 수 있도록 하는 제2리턴 패스렌즈(9)와, 상기 제2리턴 패스렌즈(9)를 통과한 광을 경사 수렴하는 월러스톤 프리즘(WOLLASTON PRISM)(7)과, 월러스톤 프리즘(7)에서 경사 수렴된 광을 결상시키는 광검출기(10)로 구성된 것을 특징으로 한 것이다.The present invention provides an optical pickup (PICK-UP) apparatus for recording information on a disk or reproducing information recorded on a disk using light, so that the optical system configuration of the optical pickup can be simplified to reduce the size of the apparatus. It relates to an optical system for light, which comprises a laser diode (1) for generating light, a grating (2) for separating the light generated by the laser diode (1) into three beams (BEAM), and the grating ( A collimator lens 3 for focusing the laser diode diverging light separated by 2) in parallel, an objective lens 4 for focusing the parallel light of the collimator lens 3 on the disk 5, A polarizing beam splitter 11 positioned between the collimator lens 3 and the grating 2 to reflect optical information exiting the disk 5 and reflected by the polarizing beam splitter 11; So that the path converted light can pass through The second return pass lens 9, the Wallerstone prism 7 for obliquely converging the light passing through the second return pass lens 9, and the oblique convergence of the Wallerstone prism 7 It is characterized by consisting of a photodetector 10 for imaging the light.

Description

Optical system for optical pickup

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 종래의 광픽업용 광학계의 구성을 보인 배치도,1 is a layout view showing the configuration of a conventional optical system for optical pickup;

제2도는 본 발명의 구성을 보인 배치도.2 is a layout view showing the configuration of the present invention.

Claims

A laser diode 1 for generating light, a grating 2 for separating the light generated by the laser diode 1 into three beams BEAM, and a laser separated by the grating 2 A collimator lens 3 for focusing diode divergence light in parallel, an objective lens 4 for focusing parallel light of the collimator lens 3 on the disk 5, and the collimator lens 3 and The polarized light splitter 11 positioned between the gratings 2 and reflecting the optical information exiting the disk 5 and the light reflected by the polarized light splitter 11 and converted into paths are A second return pass lens 9 for passing therethrough, a Wallerstone prism 7 for obliquely converging light passing through the second return pass lens 9, and the Wallerstone prism 7 Pickup optical, characterized in that consisting of a photodetector (10) for imaging the light converging at the system.

The optical system for pickup according to claim 1, wherein the wallerstone prism (7) is disposed between the collimator lens (3) and the photodetector (10).

The optical system for pickup according to claim 1, wherein the collimator lens (3) is arranged to allow light to pass through in a reciprocating manner.

※ Note: The disclosure is based on the initial application.