Lens for correcting error of wave face and its optical pick-up device and correcting method

An optical pickup and wavefront technology, applied in the direction of optical recording/reproduction, optical recording head, instrument, etc., can solve the problem of heavy weight of the moving part of the actuator

Inactive Publication Date: 2004-05-19
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the number of objective lenses required is two or more, the actuator should be compatible, and the moving part of the actuator becomes heavy accordingly

Method used

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  • Lens for correcting error of wave face and its optical pick-up device and correcting method
  • Lens for correcting error of wave face and its optical pick-up device and correcting method
  • Lens for correcting error of wave face and its optical pick-up device and correcting method

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Embodiment Construction

[0080] Embodiments of the invention will now be described in detail, examples being shown in the accompanying drawings, like reference numerals designating all like elements. The embodiments are described below in order to explain the present invention by referring to the figures.

[0081] A lens for correcting aberration caused by lens tilt, according to an embodiment of the present invention, and an optical pickup using at least one objective lens included in the optical pickup will now be described with reference to the accompanying drawings.

[0082] An optical pickup according to an embodiment of the present invention includes one or more objective lenses, each of which is compatible with a new generation of DVD-type discs (hereinafter represented by New Generation DVD), DVD-type discs (hereinafter represented by DVD), and CD-type discs. (Denoted by CD below) is compatible with the series of discs, or handles different types of other discs.

[0083] An optical pickup inc...

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Abstract

An optical pickup having a plurality of objective lenses. At least one of the plurality of objective lenses is configured so that a type of wavefront error mainly generated by a tilt of the at least one of the plurality of objective lenses is the same as a type of a wavefront error mainly generated by an angle at which light is incident upon the at least one of the plurality of objective lenses.

Description

technical field [0001] The present invention relates to a lens and an optical pickup, and more particularly to a lens correcting wavefront errors due to inclination of the lens itself, an optical pickup using the lens as an objective lens, and a method of correcting wavefront errors. Background technique [0002] An optical recording and / or reproducing device is capable of recording data on or reproducing data from an optical disc, which is an optical information storage medium, by using a light spot focused by an objective lens. In optical recording and / or reproducing devices, the recording capability depends on the size of the light spot. The size of the spot (S) depends on the wavelength of the light (λ) and the numerical aperture (NA) of the objective lens, expressed by Equation 1: [0003] S∝λ / NA (1) [0004] Therefore, it is necessary to use a short-wavelength light source, such as a blue-violet laser, and an objective lens with a numerical aperture of 0.6 or greater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/02G11B7/00G11B7/002G11B7/09G11B7/095G11B7/135
CPCG11B7/0956G11B7/0935G11B7/1374G11B2007/0006G11B7/13922G11B7/0933G11B7/1353G11B7/08G11B7/09
Inventor 金泰敬郑钟三安荣万金钟培
Owner SAMSUNG ELECTRONICS CO LTD
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