Optical disc reading head utilizing super-resolution phase plate

A phase plate and super-resolution technology, applied in the direction of optical recording head, beam guiding device, etc., can solve the problems of reading signal crosstalk, high first side lobe intensity, etc., and achieve the effect of avoiding signal interference

Inactive Publication Date: 2007-08-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the currently designed super-resolution phase plates all have the disadvantage of high first side lobe intensity. Read signal causing crosstalk

Method used

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  • Optical disc reading head utilizing super-resolution phase plate
  • Optical disc reading head utilizing super-resolution phase plate
  • Optical disc reading head utilizing super-resolution phase plate

Examples

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0027] Please refer to FIG. 1 first. FIG. 1 is a schematic structural diagram of an optical disc pickup head using a super-resolution phase plate according to the present invention. As can be seen from the figure, the present invention adopts the structure of the optical disc pickup head of the super-resolution phase plate, including a semiconductor laser 1, a collimating lens 2, a beam splitter 3, The reading and writing objective lens 5, on the reflection optical path of the described beam splitter 3, are focusing lens 7 and photodetector 8 successively, it is characterized in that between the described beam splitter 3 and the reading and writing objective lens 5 and close to the reading The writing objective lens 5 places the super-resolution phase plate 4.

[0028] The...

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PUM

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Abstract

This invention relates to a disc read head applying a super-resolution phase board including a semiconductor laser, a collimation lens, a beam splitter and a read objective orderly on a same optical shaft along the forward direction of the output beams of the laser, a focus lens and a photoelectric detector on the reflection optical path of the splitter characterizing in placing a super-resolution phase board adhered to the read-write objective between the beam splitter and the objective, which can get the result of compression of the central main leaf, less strength of a first side leaf and moving outside of the highest side leaf so as to read high density discs.

Description

technical field [0001] The invention relates to a high-density optical disc, in particular to an optical disc reading head using a super-resolution phase plate, which is used for signal reading of the high-density optical disc. Background technique [0002] With the rapid development of information technology, people have higher and higher requirements for information storage. The storage capacity of existing CD and DVD discs can no longer meet people's needs, and it is necessary to seek higher-density optical storage technology. The most direct way to increase the storage density of an optical disc is to reduce the spot size. The spot size is related to the diffraction effect of the focused laser beam. The relationship between the spot size (S) and the laser wavelength (λ) and the lens numerical aperture (NA) is as follows: [0003] S = 1.22 λ NA <!--img id="idf0001" file="A2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/12
Inventor 周常河曹由由底彩慧
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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