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Optical element, aberration compensating element, objective lens system, an optical pickup device

An optical system, optical pickup technology, applied in optical recording heads, optical recording/reproducing, instruments, etc., can solve problems such as increased spherical aberration, recording and reproducing characteristics obstacles, etc.

Inactive Publication Date: 2008-05-21
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in order to reduce the manufacturing cost, it is effective to make the objective optical system a plastic lens, but the spherical aberration caused by the change in the refractive index accompanying the temperature change increases, so when the temperature in the optical pickup changes, for high-density optical discs Obstacles arise in the recording and reproducing characteristics of the information

Method used

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  • Optical element, aberration compensating element, objective lens system, an optical pickup device
  • Optical element, aberration compensating element, objective lens system, an optical pickup device
  • Optical element, aberration compensating element, objective lens system, an optical pickup device

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Embodiment 4

[1289] The optical element of embodiment 4 is to the plastic lens of numerical aperture 0.85 that spherical aberration correction is optimized to wavelength 408nm, protective layer thickness 0.0875mm, magnification 1 / 17.123, i.e. light-collecting element L2, is combined in the optics of semiconductor laser side. A superimposed diffractive structure is formed on the functional surface S1, and an aberration correcting element L2 which is a plastic lens with a superimposed structure is formed on the optical functional surface S2 on the optical disc side.

[1290] In addition, the optical element of Example 5 is an optical lens combined on the semiconductor laser side with a plastic lens with a numerical aperture of 0.85, that is, a plastic lens with a numerical aperture of 0.85 optimized for spherical aberration correction at a wavelength of 408 nm, a protective layer thickness of 0.0875 mm, and a magnification of 0. A superimposed diffractive structure is formed on the functional...

Embodiment 6

[1291] The optical element of embodiment 6 is to the plastic lens of numerical aperture 0.85 that spherical aberration correction is optimized to wavelength 407nm, protective layer thickness 0.1mm, magnification 1 / 14.104, i.e. light-collecting element L2, is combined in the optics of semiconductor laser side. A superimposed diffractive structure is formed on the functional surface S1, and an aberration correcting element L1 which is a plastic lens with a superimposed structure is formed on the optical functional surface S2 on the optical disc side.

[1292] In addition, the optical element of embodiment 7 is to wavelength 405nm, protective layer thickness 0.0875mm, magnification 0 the spherical aberration correction optimized plastic lens of numerical aperture 0.85 is light-collecting element L2 and the optical function on the semiconductor laser side. A superimposed diffractive structure is formed on the surface S1, and an aberration correcting element L1, which is a plastic l...

Embodiment 8

[1293] The optical element of embodiment 8 is to wavelength 407nm, protective layer thickness 0.0875mm, magnification 1 / 11.416 the spherical aberration correction optimization plastic lens of numerical aperture 0.85 is light-collecting element L2 and the optical function on the semiconductor laser side The optical path difference imparting structure NPS is formed on the surface S1, and the aberration correcting element L1 which is a plastic lens having a stacked structure HOE is formed on the optical function surface S2 on the optical disc side.

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Abstract

The invention provides an optical element, an aberration rectifying element, a focus element, an objective optical system, an optical picker and an optical information record play device, in particular to an optical element for an optical picker which plays and / or records the information of a first optical information recording medium and a second optical information recording medium through a light beam which has a first wave length Lambada1 and Lambada2. The optical element is provided with an optical functional side taking an overlapping diffraction structure which arranges a plurality of circular areas with a plurality of stairs formed internally by taking the optical axle as the center; and an optical functional side taking a diffraction structure which consists of a plurality of circular area which are divided through stairs in the optical axle.

Description

[0001] This application is a divisional application of the patent application with the application number 200410059778.6, the application date is June 17, 2004, and the invention title is "optical element, aberration correction element, objective optical system, optical pickup". technical field [0002] The present invention relates to an optical element, an aberration correcting element, a condensing element, an objective optical system, an optical pickup using these optical elements, and an optical information recording and reproducing device. Background technique [0003] In recent years, in the optical pickup, the laser source used as a light source for reproducing information recorded on an optical disc or for recording information on an optical disc has been shortened in wavelength, such as a blue-violet semiconductor laser, a second harmonic A laser light source with a wavelength of 405nm, such as a blue-violet SHG laser that converts the wavelength of an infrared semi...

Claims

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Application Information

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IPC IPC(8): G11B7/135G11B7/1353G11B7/1374G11B7/1392
Inventor 木村徹山下洁森伸芳新勇一
Owner KONICA MINOLTA OPTO