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Objective lens and optical pickup device

A technology for an optical pickup device and an objective lens, which can be applied to beam guiding devices, optical recording heads, recording/reproducing by optical methods, etc., can solve the problems of rising cost, disadvantageous miniaturization, etc., to ensure the working distance and reduce the paraxial Effect of curvature radius, long focus distance

Inactive Publication Date: 2011-12-21
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a method to achieve accurate recording / reproduction of information while maintaining compatibility with any of BD, DVD, and CD, it is possible to selectively switch the optical system for BD and DVD, DVD, CD uses the optical system method, but this requires multiple optical systems, which is not conducive to miniaturization and increases the cost

Method used

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  • Objective lens and optical pickup device
  • Objective lens and optical pickup device
  • Objective lens and optical pickup device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0239] Table 1 shows the lens data of Example 1. Image 6 It is a sectional view of the objective lens of Example 1. Figure 7 (a) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dashed line) of Example 1 when used in BD, Figure 7 (b) is a schematic diagram of longitudinal spherical aberration (solid line) and sine condition (dashed line) when DVD is used in embodiment 1, Figure 7 (c) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dotted line) of Example 1 when used in CD. In embodiment 1, such as Image 6 As shown in the enlarged diagram of , the first area R1 including the optical axis is a BD / DVD shared area, the second area R2 around it is a CD-only area, and the third area R3 around it is a BD / DVD shared area. The fourth area R4 around the outside is a CD-only area, the fifth area R5 around it is a BD / DVD shared area, and the sixth area R6 farthest from the optical ...

Embodiment 2

[0249] Figure 8 It is a sectional view of the objective lens of Example 2. Figure 9 (a) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dashed line) of Example 2 when used in BD, Figure 9 (b) is a schematic diagram of longitudinal spherical aberration (solid line) and sine condition (dashed line) when DVD is used in embodiment 2, Figure 9 (c) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dotted line) of Example 2 when CD is used. Embodiment 2 adopts the lens data of Embodiment 1, and has the same number of regions, but different region division positions. Other points, including the numerical value of the formula, are the same as in Example 1, and description thereof will be omitted.

Embodiment 3

[0251] Figure 10 It is a sectional view of the objective lens of Example 3. Embodiment 3 is different from Embodiment 1 and 2 in that it is a lens with 4 regions, such as Figure 10 As shown in the enlarged diagram of , the first region R1 including the optical axis is a BD / DVD shared area, the second area R2 around it is a CD-only area, and the third area R3 around it is a BD / DVD shared area , the fourth region R4 whose outer periphery is farthest from the optical axis is a BD-only region. Figure 11 (a) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dashed line) of Example 3 when used in BD, Figure 11 (b) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dashed line) of embodiment 3 when DVD is used, Figure 11 (c) is a schematic diagram of longitudinal spherical aberration (solid line) and sinusoidal condition (dotted line) of Example 3 when CD is used. Embodiment 3 ad...

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Abstract

The present invention provides an optical pickup device that can be used in a thin optical disk drive device and can accurately record / reproduce information on different optical disks, and an objective lens suitable for the optical pickup device. Since the paraxial curvature radius of the first optical disc area can be maintained large and the paraxial curvature radius of the first optical disc area can be reduced, the axial thickness of the objective lens can be reduced while maintaining the long focal length of the third optical disc. . This makes it possible to record / reproduce information interchangeably on three different optical disks, shorten the focal length of the CD, and provide an objective lens particularly suitable for a thin optical disk drive device.

Description

technical field [0001] The present invention relates to an optical pickup device capable of recording and / or reproducing information interchangeably with different types of optical discs, and an objective optical element used therein. Background technique [0002] In recent years, the research and development of a high-density optical disc system capable of recording and / or reproducing information (hereinafter, "recording and / or reproducing" is referred to as "recording / reproducing") using a blue-violet semiconductor laser with a wavelength of about 400 nm has rapidly progressed. As an example, the so-called Blu-ray Disc (hereinafter referred to as BD) that records / reproduces information with NA0.85, light source wavelength 405nm specifications, has the same size as DVD (NA 0.6, light source wavelength 650nm, memory capacity 4.7GB). ) The same disc with a diameter of 12cm, each layer can record 25GB of information. [0003] However, if information can only be accurately rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135
CPCG11B7/13922G11B7/1374G11B2007/0006
Inventor 白石乔则
Owner KONICA MINOLTA OPTO
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