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Liquid crystal optical element

A liquid crystal optics, liquid crystal cell technology, applied in optics, nonlinear optics, optical recording heads, etc., can solve the problem that the effective radius of the objective lens has different peak positions, etc.

Inactive Publication Date: 2008-02-27
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, neither of them can eliminate the difference in the effective radius of the objective lens and the difference in the peak position of spherical aberration caused by the above-mentioned difference in laser wavelength.

Method used

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Examples

Experimental program
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Embodiment approach 1

[0116] FIG. 1 is a schematic diagram showing the structure of an optical head device to which the liquid crystal optical element of the present invention is applied. As shown in Figure 1, the optical head device is equipped with: a blue laser light source 1 that emits blue laser light with a wavelength of about 400nm; a blue photodiode 2 that detects the retroreflected light of the laser light emitted from the blue laser light source 1; CD module 3 integrates a laser light source that emits infrared laser light with a wavelength of about 780nm and a red laser light with a wavelength of about 660nm, and a photodiode that detects each retroreflected light; constitutes a liquid crystal optical element that performs wavefront control such as spherical aberration correction The liquid crystal unit 4 of the main part; the driving circuit 5 and the objective lens 6 that constitute the power supply part of the liquid crystal optical element.

[0117] The blue laser light 7 emitted fro...

Embodiment approach 2

[0144] In Embodiment 2, concentric electrodes are provided on both the first electrode and the second electrode. For the same configuration as in Embodiment 1, the same symbols as in Embodiment 1 are assigned, and description thereof will be omitted. 13 and 14 are diagrams showing patterns of the first electrode 121 and the second electrode 123 in Embodiment 2, respectively. In addition, FIG. 15 is a diagram schematically showing the relationship between the first and second electrodes 121 and 123 and the voltage applied therebetween.

[0145] As shown in FIG. 13 , on the first electrode 121 , a sixth concentric electrode (individual concentric electrode) 36 and seventh to thirteenth concentric electrodes 37 to 43 connected by resistors as in the first embodiment are provided. The inner side of the sixth concentric electrode 36 , that is, the region where the first to fifth concentric electrodes 31 to 35 are provided in Embodiment 1 becomes a uniformly circular 14th concentri...

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Abstract

First electrode (21) of a liquid crystal cell consists of a plurality of circular concentric electrodes (31-43), and the electrodes are divided into a first concentric electrode group (44) close to the center and a second concentric electrode group (45) close to the outer circumference, and the concentric electrode (36) between the both groups is permitted to be an independent electrode. A first correction means for correcting a spherical aberration of a high density DVD is constituted of the both groups, and a first correction means for correcting an aberration of a conventional DVD is constituted of the first concentric electrode group (44). At the time of correcting an aberration of a conventional DVD, the independent concentric electrode (36) is supplied with a voltage between the voltages being supplied to adjacent concentric electrodes (35, 37). At the time of correcting an aberration of a high density DVD, the independent concentric electrode (36) is supplied with a voltage identical to the voltage being supplied to the concentric electrode (37) just on the outside thereof.

Description

technical field [0001] The present invention relates to a liquid crystal optical element, in particular to a liquid crystal optical element that corrects wavefront fluctuations, distortions, aberrations, etc. Background technique [0002] Conventionally, optical disks such as CDs (Compact Discs) and DVDs (Digital Versatile Disks) have been used as media for recording music information, image information, and the like. In an optical disc device, laser light is condensed by a lens to irradiate the information recording layer of the optical disc, and the recorded information on the optical disc is read by detecting the reflected light. When reading the recorded information of a CD, an infrared laser with a wavelength of about 780 nm and an objective lens with a numerical aperture of about 0.45 to 0.51 are used. [0003] In addition, since DVDs record information at a higher density than CDs, red laser light with a shorter wavelength, eg, about 660 nm, and an objective lens wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G02F1/13G02F1/1343G11B7/125
CPCG02F2203/18G11B7/1369G11B2007/0006G11B7/13925G11B7/1367G02F1/134309
Inventor 大泽诚一佐藤慎也岩崎正之丰田刚士
Owner CITIZEN WATCH CO LTD
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