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Optical pickup device

An optical pick-up device, laser technology, applied in the direction of beam guiding device, optics, optical components, etc., can solve the problems of large-scale objective lens adjuster, objective lens drive response and adverse effects of motion characteristics, etc.

Inactive Publication Date: 2009-01-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this way, the size of the objective lens adjuster will be increased, and there will also be a problem that it will adversely affect the drive response and motion characteristics of the objective lens.
Furthermore, if an installation error of the liquid crystal panel with respect to the objective lens adjuster occurs, the optical axis deviation between the objective lens and the liquid crystal panel is fixed, and as a result, there is a problem that the aberration due to the optical axis deviation is not limited to the objective lens. of the shifted position, but stably yields

Method used

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Embodiment Construction

[0019] Next, embodiments of the present invention will be described. In this embodiment, the present invention is applied to an optical pickup device used in a next-generation DVD (Digital Versatile Disc) having a substrate thickness of 0.6 mm.

[0020] FIG. 1 shows an optical system of an optical pickup device according to an embodiment. In addition, in this figure, the circuit configuration (reproducing circuit 201, servo circuit 202, and liquid crystal drive circuit 203) for driving and controlling the optical pickup device is shown for convenience.

[0021] As shown in the figure, the optical pick-up device includes: a semiconductor laser 11; a polarized light beam splitter (polarized light BS) 12; a collimator (collimator) lens 13; a phase correction element 14; a mirror 15; objective lens 17; objective lens adjuster 18; detection lens 19; light detector 20.

[0022] The semiconductor laser 11 emits laser light having a blue wavelength (407 nm in this embodiment). The ...

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Abstract

A wavefront of a laser light is adjusted using a phase correcting element. The phase correcting element includes an electrode layer, an electrode layer arranged facing the former electrode layer, orientation films arranged on a surface facing the electrode layers, and a liquid crystal layer filled between the orientation films. One of the two electrode layers is formed with an electrode pattern (ring shaped electrode) for providing a spherical aberration correcting effect to the laser light within a constant distance from a center of a beam incident diameter, and a continuous electrode is arranged on an outer side thereof. Occurrence of the aberration by a lens shift is effectively suppressed by omitting electrodes arranged slightly on an inner side of the conventional beam incident diameter.

Description

technical field [0001] The present invention relates to an optical pickup device, particularly a device suitable for use when suppressing spherical aberration. Background technique [0002] In recent years, along with the increase in density of optical discs, objective lenses with high numerical apertures have been used. However, if an objective lens with a high numerical aperture is used, aberrations are likely to occur in the laser light due to substrate thickness errors of the optical disk or the like. Therefore, in this case, a spherical aberration correction mechanism is required in the optical pickup device. [0003] An example of using a liquid crystal panel as a spherical aberration correcting element is disclosed in JP-A-10-269611 (Patent Document 1). In addition, JP-A-2000-40249 (Patent Document 2) and JP-A-10-289465 (Patent Document 3) disclose examples of using a liquid crystal panel as an astigmatism correction element and a coma aberration correction element....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G02B5/00G11B7/1392
Inventor 永富谦司梶山清治
Owner SANYO ELECTRIC CO LTD