KR980004461A

KR980004461A - Optical pick-up device

Info

Publication number: KR980004461A
Application number: KR1019960024355A
Authority: KR
Inventors: 최양모
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1996-06-27
Filing date: 1996-06-27
Publication date: 1998-03-30

Abstract

본 발명은 광학 데이터기록매체에 신호를 기록하고, 그 기록된 정보를 전기신호로 재생시키는 광 픽-업장치에 관한것으로서, 특히 일반적 음악재생용 디지털 오디오 디스크(DAD)와 영상 및 음성 재생용 디지털 비디오 디스크(DVD)를 동시에 재생할 수 있도록 하는 광-픽업장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to an optical pick-up apparatus for recording signals on an optical data recording medium and reproducing the recorded information by electric signals, Up apparatus capable of reproducing a video disc (DVD) at the same time.

이를 위하여 실리콘기판에 서로다른 두 개의 파장을 방사하는 2파장 레이저다이오드, 그리고 프리즘에는 레이저빔을 쓰리빔으로 분리하는 회절격자, 특정과 만을 일정비율로 반사 및 투과하는 편광 빔스플리트, 디스크를 통해 돌아오는 광정보에 비점수차를 발생시켜 광검출기로 조사하는 홀로그램격자, 특정파장의 레이저빔만을 선택적으로 투과하고, 그 이외 파장의 레이저 빔은 반사시켜 디스크상에 스포트 사이즈를 조절함과 동시에 상광선은 이상광선으로 변환시키는 파장변환 및 빔조 절판을 집적형성하여 디스크상에 직경이 1.6㎛와 0.8㎛의 빔 포커스가 동시에 형성되도록하여 디지털 오디오 디스크는 물론, 상기 오디오 디스크 보다 데이터 기록 용량이 수배 많아 피트의 폭이 현저히 좁은 디지털 비디오 디스크의 재생이 가능토록 한 것이다.For this purpose, a two-wavelength laser diode is used to emit two different wavelengths to the silicon substrate. The prism includes a diffraction grating for separating the laser beam into three beams, a polarization beam splitter for reflecting and transmitting only a specific portion of the laser beam, A hologram grating for generating astigmatism in the optical information to be irradiated, a holographic grating for selectively transmitting only a laser beam having a specific wavelength, and a laser beam having a wavelength other than that to reflect the spot size on the disk, A beam conversion plate for converting the light beam into an ideal light beam and a beam tilting plate are integrally formed to form a beam focus with diameters of 1.6 mu m and 0.8 mu m on the disk at the same time, So that it is possible to reproduce a digital video disk having a significantly narrow width.

Description

Optical pick-up device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제2도는 본 발명에 따른 광 픽-업장치의 구성도.FIG. 2 is a configuration diagram of an optical pick-up apparatus according to the present invention; FIG.

Claims

A optical pick-up apparatus for condensing a beam with a laser beam as an objective lens to record a signal on a disk and reproduce the recorded information as an electric signal, comprising: a silicon substrate (60) on which a plurality of optical elements A two-wavelength laser diode 62 formed inside the support 61 on one upper surface of the silicon substrate 60 and simultaneously emitting beams of lambda 1 and lambda 2 having different wavelengths is formed on the upper surface of the other side of the silicon substrate 60, A prism 66 which is formed on the upper surface of the silicon substrate 60 on which the photodetector 63 is formed to have a predetermined size and transmits the laser beam, A polarization beam splitter 65 formed at the center of the prism 66 to reflect an upper ray of light (P wave) of the incident beam and to transmit an ideal ray (S wave), a polarization beam splitter A hologram element for focusing the incident beam, A diffraction grating 67 formed on one side of the prism 66 for separating the laser beam emitted from the two-wavelength laser diode 62 into three beams for generating a tracking error, And a beam control plate (70) formed on an upper surface of the beam splitter (66) for selectively transmitting only a beam of a specific wavelength to adjust a spot size on the disk and converting the optical information P wave into an S wave.

※ Note: It is disclosed by the contents of the first application.