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Optical read-write head

A technology of optical read-write head and optical components, which is applied in the field of optical read-write head, can solve the problems of high manufacturing process of optical read-write head, increase of production cost, complicated production process, etc., and achieve improved competitiveness, low cost and relative control The effect of intensity noise

Inactive Publication Date: 2009-09-23
TOPRAY MEMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Because the polarization beam splitter 104 and the quarter-wave plate 105 of this optical read-write head require high manufacturing technology and complicated manufacturing process, not only the implementation and manufacturing process are extremely complicated, but also the production cost is increased.

Method used

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  • Optical read-write head

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Experimental program
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Embodiment Construction

[0045] figure 2 It is a structural schematic diagram of the optical read-write head of the present invention. The optical read / write head includes an optical element 204 , a laser diode element 203 , a recording medium 201 and an optical signal detector 202 . The optical element 204 also includes a light splitting element 204a, a reflective coating device 204b and an objective lens 204d.

[0046] Laser diode 203 emits 1 to 3 different wavelengths λ 1 ~λ 3 But linearly polarized light with the same polarization direction. The linearly polarized light is projected on a recording medium 201 through the light splitting element 204a, the reflective coating device 204b, the coupling mirror 204c (optional), and the objective lens 204d. Then it is reflected to the objective lens 204d, the coupling mirror 204c and the reflective coating device 204b through the surface of the recording medium 201 in sequence. The light beam passing through the reflective coating device 204 b is re...

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Abstract

The invention provides an optical read-write head equipped with a reflective coating device, which includes a laser diode, an optical element, a recording medium, and an optical signal detector. A laser diode is a laser light source with 1 to 3 different wavelengths but the same linear polarization direction. After being reflected twice by a reflective coating device, it is changed into a linearly polarized feedback light with a difference of 90° from the original linear polarization direction, so as to reduce the laser diode due to The purpose of the relative intensity noise generated by the feedback light from the recording medium.

Description

technical field [0001] The invention relates to an optical pickup, in particular to an optical pickup equipped with a reflective coating device. Background technique [0002] Music discs (Compact Disk, CD), video discs (Video Compact Disk, VCD) and digital video discs (Digital Video Disk, DVD) have been widely used in business, family and personal life, so all related industries are committed to Research and develop more efficient reading or recording technology to improve the quality of recording media such as CD, VCD and DVD. [0003] The optical read / write head reads or records data through a recording medium (recording). The light emitted by the laser diode (laserdiode, LD) is focused on the surface of the recording medium through the optical element set, and the optical signal detector (photo detector integrated circuit, PDIC) receives the signal or detects its reflection strength. [0004] figure 1 It is a structural schematic diagram of a known optical read-write h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/12G11B7/135G11B7/127
Inventor 王进康杨聪明
Owner TOPRAY MEMS