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Objective lens and optical pickup device

A technology of optical pickup device and objective lens, which is applied in the recording/reproducing, data recording, instrument and other directions by optical methods, can solve the problems of increased cost, disadvantageous miniaturization, etc. The effect of large spacing

Inactive Publication Date: 2015-02-04
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a method for appropriately recording / reproducing information while maintaining compatibility with BD, DVD, and CD, it is considered to selectively switch the optical system for BD and DVD or CD according to the recording density of the optical disc to record / reproduce information. The optical system method for CD, but it is not conducive to miniaturization and increases the cost due to the need for multiple optical systems

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

[0333] Table 1 shows the lens data of Example 1. The objective lens of embodiment 1 is a plastic monolithic lens, the steps of the first basic structure and the third basic structure face the direction opposite to the optical axis, and the steps of the second basic structure, the fourth basic structure and the fifth basic structure face the optical axis The direction of the axis. In addition, in the first optical path difference imparting structure of Example 1, in the entire area of ​​the central area, the second basic structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed as (1 / 1 / 1) 1) The optical path difference imparting structure of the first basic structure of the blazed diffractive structure. The second optical path difference imparting structure is a fourth base structure that is a (1 / 1) blazed diffraction structure superimposed on the fourth base structure that is a (5 / 3) blazed diffraction structure in the entire middle region. The optical path di...

Embodiment 2

[0353] Table 2 shows the lens data of Example 2. The objective lens of embodiment 2 is a plastic monolithic lens, the steps of the first basic structure and the third basic structure are towards the direction opposite to the optical axis, and the steps of the second basic structure, the fourth basic structure and the fifth basic structure are towards the optical axis. The direction of the axis. In addition, in the first optical path difference providing structure of Example 2, in the entire area of ​​the central area, the second basic structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed as (1 / 1 / 1) 1) The optical path difference imparting structure of the first basic structure of the blazed diffractive structure. The second optical path difference imparting structure is a fourth base structure that is a (1 / 1) blazed diffraction structure superimposed on the fourth base structure that is a (5 / 3) blazed diffraction structure in the entire middle region. The ...

Embodiment 3

[0373] Table 3 shows the lens data of Example 3. The objective lens of embodiment 3 is a plastic monolithic lens, and the steps of the first basic structure and the third basic structure are towards the direction opposite to the optical axis, and the steps of the second basic structure, the fourth basic structure and the fifth basic structure are towards the optical axis. The direction of the axis. In addition, in the first optical path difference imparting structure of Example 3, in the entire area of ​​the central area, the second basic structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed as (1 / 1 / 1) 1) The optical path difference imparting structure of the first basic structure of the blazed diffractive structure. The second optical path difference imparting structure is a fourth base structure that is a (1 / 1) blazed diffraction structure superimposed on the fourth base structure that is a (7 / 4) blazed diffraction structure in the entire middle region. ...

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Abstract

Provided are a single-element objective lens compatible with optical disks of the three formats BD / DVD / CD, the objective lens being adaptable to compact size while having good moldability, and being capable of stable recording and playback of information due formation of an appropriate spot diameter, even during use with a BD, making the lens suitable for a compact optical pickup device; and an optical pickup device equipped with this objective lens. A first optical path difference-imparting structure in the center region of the objective lens is structured to have a (2 / 1 / 1) first fundamental structure and a (1 / 1 / 1) second fundamental structure. A second optical path difference-imparting structure in an intermediate region is structured to have a (1 / 1 / 1) fourth fundamental structure and a (7 / 4) or (5 / 3) third fundamental structure. A third optical path difference-imparting structure in a peripheral region is structured to have a fifth fundamental structure whereby the quantity of second-order or fourth order refracted light of a first light beam is greater than the quantity of refracted light of any other order.

Description

technical field [0001] The present invention relates to an optical pickup device, an objective lens, and an optical information recording and reproducing device capable of recording and / or reproducing information (recording / reproducing) in a manner compatible with different types of optical discs. Background technique [0002] In recent years, in the optical pick-up device, the wavelength of the laser light source used as the reproduction of the information recorded in the optical disc or the light source for the recording of the information of the optical disc is gradually shortened. For example, the wavelength of blue-violet semiconductor lasers is 390~ The 420nm laser light source has become practical. If these blue-violet laser light sources are used, in the case of using an objective lens with the same aperture number (NA) as DVD (Digital Versatile Disc), it is possible to record information of 15 to 20 GB on a disc with a diameter of 12 cm. When the NA of the optical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/1353G11B7/1367G11B7/1374G11B7/1392
CPCG11B7/1374G11B7/1353G11B7/1275G11B7/1367G11B2007/0006G11B7/13922
Inventor 立山清乃
Owner KONICA MINOLTA INC
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