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Optical pick-up apparatus

a technology optical beam source, which is applied in the field of optical pick-up apparatus, can solve the problems of having to tune the power level of the light source of the conventional optical pick-up apparatus, and achieve the effect of reducing the power level of the light sour

Inactive Publication Date: 2005-11-22
TS OPTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, since the power levels of the light source 12 required for recording information on the recording medium and reproducing information from the recording medium are different, the conventional optical pick-up apparatus has the disadvantage of having to tune the power level of the light source 12 by employing an appropriate circuit.

Method used

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  • Optical pick-up apparatus
  • Optical pick-up apparatus

Examples

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Embodiment Construction

[0015]Referring to FIG. 2, an embodiment of an optical pick-up apparatus according to the present invention comprises an optical modular device 20 which emits light beams and receives light beams reflected from a recording medium 1, a photo-refractive crystal device 37 for coupling the powers of two incident light beams, and an objective lens 39 disposed on the optical path between the photo-refractive crystal device 37 and the recording medium 1 for converging incident light beams onto the recording medium 1.

[0016]The optical modular device 20 includes a substrate 22, and a housing 23 on the upper surface of the substrate 22. A mount 31 is fixed on the substrate 22 within the housing 23, first and second light sources 41 and 51 are installed at opposing sides of the mount 31, and a photo-detector 33 for detecting light beams reflected from the recording medium 1 is installed on the upper surface of the mount 31.

[0017]In this embodiment, the first and second light sources 41 and 51 ...

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Abstract

An optical pick-up apparatus comprising an optical modular device having two light sources for emitting light beams of different power levels, a photo-refractive crystal device disposed on the optical modular device and a recording medium for coupling the powers of the light beams emitted from the two light sources, and an objective lens disposed on the optical path between the photo-refractive crystal device and the recording medium for focusing the light beam emitted from the light sources on the recording medium. The optical modular device is comprised of a substrate, a mount installed on the substrate, first and second light sources installed on opposing sides of the mount, a photo-detector installed on the mount for receiving a light beam which is reflected from a recording medium, a housing having an opening in the upper portion thereof and incorporated on the upper surface of the substrate, an optical path changing unit installed at the opening of the housing for changing the path of an incident light beam.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an optical pick-up apparatus for recording and / or reproducing various types of information on an optical recording medium, and more particularly, to an optical pick-up apparatus employing an optical modular device having two light sources of different power levels.[0003]2. Description of the Related Art[0004]Referring to FIG. 1, a conventional holographic pick-up apparatus comprises an optical module 10, integrally formed with a light source 12 for emitting a light beam and a photo-detector 17 for detecting a light beam reflected from an optical recording medium, and objective lens 16 for converging the light beam emitted from the light source 12 onto the optical recording medium 1.[0005]The above-mentioned optical module 10 includes a substrate 2 and a housing 3. The light source 12 is installed at one side of a mount 11 that is installed on the substrate 2 within the housing 3. The pho...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/004G11B7/12G11B7/123G11B7/125G11B7/126G11B7/127G11B7/13G11B7/135G11B7/1353G11B7/1365G11B7/20
CPCG11B7/126G11B7/127G11B7/1353G11B7/1365G11B7/123
Inventor KIM, JOO-YOUP
Owner TS OPTICS CORP