KR980004511A - Optical pick-up device - Google Patents

Abstract

The present invention relates to a light-pick-up apparatus for recording a signal on an optical data recording medium and reproducing the recorded information by an electric signal, and more particularly to a light-pick-up apparatus for reproducing a digital audio disc (DAD) Up apparatus capable of reproducing a disc (DVD) at the same time.

A two-wavelength laser diode which is formed inside one side of the silicon substrate and emits beams of first and second wavelengths having different wavelengths at the same time, and a two-wavelength laser diode formed on the other side of the silicon substrate A photodetector formed at a predetermined position in the support to detect optical information of the disk, a prism that is formed in a predetermined size on a silicon substrate on which the two-wavelength laser diode is formed and transmits a laser beam, A beam splitter which transmits and reflects the separated three beams formed at a predetermined distance from the diffraction grating and separated from the diffraction grating at a predetermined ratio, And is formed on one side and diffracts the optical information reflected from the disc and returns to the optical disc, A holographic grating, and a selective beam light-transmitting portion formed on the prism to selectively transmit only a laser beam of a specific wavelength, and to reflect a laser beam of other wavelengths to adjust a spot size on the disk.

Description

Optical pick-up device

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FIG. 2 is a configuration diagram of an optical pick-up apparatus according to the present invention.

Claims (1)

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 second wavelength laser diode 63 formed inside one side of the silicon substrate 60 for simultaneously emitting beams of first and second wavelengths lambda 1 and lambda 2 having different wavelengths, A photodetector 62 formed at a predetermined position in the support 61 for detecting optical information of the disk and a silicon substrate 60 on which the two-wavelength laser diode 63 is formed, A prism 66 formed to have a predetermined size and transmitting a laser beam, a diffraction grating 64 formed in the prism 66 so as to have a concavo-convex shape in the diagonal direction to separate the incident beam into three beams to generate a tracking error, The diffraction grating 64 is disposed at a predetermined distance from the prism 6 A beam splitter 65 formed inside the prism 66 for transmitting and reflecting the separated three beams at a predetermined ratio, diffracting optical information reflected on the disk 55 formed on one side of the prism 66, A holographic grating 67 for irradiating the photodetector 62, a prism 66 for selectively transmitting only a laser beam having a specific wavelength, a laser beam having a wavelength other than that of the prism 66, And an optional beam transmitting portion (70) capable of adjusting a spot size. ※ Note: It is disclosed by the contents of the first application.