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Objective lens, optical pickup apparatus and optical information recording and reproducing apparatus

一种光拾取装置、信息记录的技术，应用在光学记录头、光束引导装置、集成光学头装置等方向，能够解决没有公开校正像散、没有公开光拾取装置互换性等问题，达到提高像差校正性能、减少光学部件个数、校正像散的效果

Inactive Publication Date: 2008-07-02
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the above-mentioned Patent Documents 1 and 2, there is no disclosure about technology for making optical pickup devices interchangeable, and in the above-mentioned Patent Document 3, there is no disclosure about technology for correcting astigmatism generated during tracking.

Method used

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  • Objective lens, optical pickup apparatus and optical information recording and reproducing apparatus
  • Objective lens, optical pickup apparatus and optical information recording and reproducing apparatus
  • Objective lens, optical pickup apparatus and optical information recording and reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Next, a first example of the objective lens and the optical pickup device shown in the above-mentioned embodiments will be described.

[0104] Table 1 and Table 2 show the lens data of each optical element.

[0105] [Table 1]

[0106] f=2.29mm m=-1 / 7 NA=0.60

[0107]

[0108]

[0109] Astigmatism DVD=0μm, CD=0μm

[0110] [Table 2]

[0111] Aspheric data

[0112] The 4th side (0≤h<1.245mm: DVD / CD common area)

[0113] Aspheric coefficient

[0114] κ-5.9547×E-1

[0115] A4-7.8536×E-3

[0116] A6-2.2592×E-3

[0117] A8-1.4896×E-3

[0118] A10-8.6859×E-4

[0119] A12+3.0411×E-3

[0120] A14-1.1970×E-3

[0121] Optical path difference function (optical path difference function coefficient: λB 720nm 1st diffraction)

[0122] B4-3.6858×E-3

[0123] B6-1.0370×E-3

[0124] B8+9.6293×E-4

[0125] B10-3.2649×E-4

[0126] 4' side (1.245mm≤h: DVD dedicated area)

[0127] Aspheric coefficient

[0128] κ-4.6344×E-1

[0129] A0+1.6824×E-2

[0130] A4+2.4963×E...

Embodiment 2

[0188] Next, a second example of the objective lens and the optical pickup device shown in the above-mentioned embodiments will be described.

[0189] Table 3 and Table 4 show the lens data of each optical element.

[0190] [table 3]

[0191] f=2.29mm m=-1 / 7 NA=0.60

[0192]

[0193] Astigmatism DVD=0μm, CD=0μm

[0194] [Table 4]

[0195] Aspheric Data

[0196] The 4th side (0≤h<1.245mm: DVD / CD common area)

[0197] Aspheric coefficient

[0198] κ-5.9547×E-1

[0199] A4-7.8536×E-3

[0200] A6-2.2592×E-3

[0201] A8-1.4896×E-3

[0202] A10-8.6859×E-4

[0203] A12+3.0411×E-3

[0204] A14-1.1970×E-3

[0205] Optical path difference function (optical path difference function coefficient: λB 720nm 1st diffraction)

[0206] B4-3.6858×E-3

[0207] B6-1.0370×E-3

[0208] B8+9.6293×E-4

[0209] B10-3.2649×E-4

[0210] 4' side (1.245mm≤h: DVD dedicated area)

[0211] Aspheric coefficient

[0212] κ-4.6344×E-1

[0213] A0+1.6824×E-2

[0214] A4+2.4963×E-2

[0215...

Embodiment 3

[0257] Next, a third example of the objective lens and the optical pickup device shown in the above-mentioned embodiments will be described.

[0258] Table 5 and Table 6 show the lens data of each optical element.

[0259] [table 5]

[0260] f=2.29mm m=-1 / 7 NA=0.60

[0261]

[0262] Astigmatism DVD=10μm, CD=10μm

[0263] [Table 6]

[0264] Aspheric Data

[0265] The 4th side (0≤h<1.245mm: DVD / CD common area)

[0266] Aspheric coefficient

[0267] κ-5.9547×E-1

[0268] A4-7.8536×E-3

[0269] A6-2.2592×E-3

[0270] A8-1.4896×E-3

[0271] A10-8.6859×E-4

[0272] A12+3.0411×E-3

[0273] A14-1.1970×E-3

[0274] Optical path difference function (optical path difference function coefficient: λB 720nm 1st diffraction)

[0275] B4-3.6858×E-3

[0276] B6-1.0370×E-3

[0277] B8+9.6293×E-4

[0278] B10-3.2649×E-4

[0279] 4' side (1.245mm≤h: DVD dedicated area)

[0280] Aspheric coefficient

[0281] κ-4.6344×E-1

[0282] A0+1.6824×E-2

[0283] A4+2.4963×E-2

[028...

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Abstract

A finite conjugate type object lens having interchangeability with a plurality of types of optical disk and being capable of correcting astigmatism occurring due to tracking and astigmatism provided by a light source itself; an optical pickup device and an optical information recording / reproducing device provided with this object lens. The optical pickup device comprises a first light source for outputting a first light flux, and second light source for outputting a second light flux, and a finite conjugate object lens for condensing the first and second light fluxes. The object lens has astigmatism to a light flux with a wavelength lambda1 and is disposed in such a direction that an astigmatism occurring direction decreases the astigmatism of a light flux with a wavelength lambda1 occurring due to tracking. In addition, the astigmatism of the object lens has a minimum value when an image height in the tracking direction of the object lens is within a specified range.

Description

technical field [0001] The invention relates to an objective lens, an optical pickup device and an optical information recording and reproducing device. Background technique [0002] As an optical system for an optical pickup device for recording and / or reproducing information on an optical disc such as a DVD (Digital Versatile Disc) or a CD (Compact Disc), a finite conjugate type objective lens may be used. By constituting the finite conjugate type, it is possible to omit optical elements such as a collimator for making parallel light incident on the objective lens, and it is possible to reduce the number of components and cost of the optical pickup device. [0003] However, when the finite conjugate type objective lens is used, when the objective lens is moved and tracked in a direction perpendicular to the optical axis, astigmatism occurs due to the use of off-axis rays. Here, a technique for canceling the astigmatism by using the astigmatism of the objective lens itself...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/135G02B5/18G02B13/00G02B13/18G11B7/00G11B7/12G11B7/125
CPCG11B7/1374G11B7/1367G11B2007/0006G11B7/1275G11B7/123G11B7/13922G02B5/18G02B13/00G11B7/1353
Inventor 坂本胜也
Owner KONICA MINOLTA OPTO