Objective lens and optical pickup device

A technology for an optical pickup device and an objective lens, which can be applied to recording/reproducing by optical methods, systems characterized by a carrier structure, data recording, etc., and can solve problems such as increased cost and unfavorable miniaturization.

Inactive Publication Date: 2017-02-15
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 any of BD, DVD, and CD, it is conceivable to selectively switch between BD and BD according to the recording density of the optical disc on which information is recorded / reproduced. Optical system and optical system method for DVD and CD, but requires multiple optical systems, so it is not conducive to miniaturization, and the cost increases

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

[0334]Tables 1A and 1B show the lens data of Example 1. The objective lens of Example 1 is a plastic single-lens lens, the steps of the first and third basic structures face the direction opposite to the optical axis, and the steps of the second and fourth basic structures face the direction of the optical axis. In addition, in the first optical path difference imparting structure of Example 1, the second base structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed on the second base structure of (1 / 1) in the entire central region. / 1) The optical path difference imparting structure of the first basic structure of the blazed diffraction structure. The second optical path difference imparting structure is a (1 / 1 / 1) blazed type superimposed on the fourth base structure which is a (2 / 1 / 1) blazed type diffractive structure in the entire middle region The optical path difference imparting structure of the third basic structure of the diffractive structure. In add...

Embodiment 2

[0353] Tables 2A and 2B show the lens data of Example 2. The objective lens of Example 2 is a plastic single-lens 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 and the fourth basic structure face the direction of the optical axis. In addition, in the first optical path difference imparting structure of Example 2, the second basic structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed on the second base structure of (1 / 1) in the entire area of ​​the central region. / 1) The optical path difference imparting structure of the first basic structure of the blazed diffraction structure. The second optical path difference imparting structure is a (1 / 1 / 1) blazed type superimposed on the fourth base structure which is a (2 / 1 / 1) blazed type diffractive structure in the entire middle region The optical path difference imparting structure of the third...

Embodiment 3

[0371] Tables 3A and 3B show the lens data of Example 3. The objective lens of Example 3 is a plastic single-lens lens, and the steps of the first and third basic structures face the direction opposite to the optical axis, and the steps of the second and fourth basic structures face the direction of the optical axis. In addition, in the first optical path difference imparting structure of Example 3, the second base structure of the blazed diffraction structure of (2 / 1 / 1) is superimposed on the second basic structure of (1 / 1) in the entire central region. / 1) The optical path difference imparting structure of the first basic structure of the blazed diffraction structure. The second optical path difference imparting structure is a (1 / 1 / 1) blazed type superimposed on the fourth base structure which is a (2 / 1 / 1) blazed type diffractive structure in the entire middle region The optical path difference imparting structure of the third basic structure of the diffractive structure. ...

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Abstract

An objective lens advantageous for a compact optical pickup device and an optical pickup device in which the objective lens is mounted are provided. A single-lens objective lens compatible with the three types of optical discs of BD / DVD / CD, wherein a working distance is ensured during use with a CD, which has a thick substrate, and a suitable spot diameter is formed during use with a BD or DVD, whereby information can be stably recorded and played back. Using a design that satisfies formula (1) and formula (3) prevents an increase in the spot diameter in BD and DVD. 1.0 @ f1 @ 2.2 (1) 0.66 @ phi2 / (2.f1.(1 - m2)) @ 0.75 (3) where f1 is the focal distance of the objective lens in a first luminous flux, phi2 is the outside diameter of the intermediate region of the objective lens, and m2 is the imaging magnification of the objective lens in a second luminous flux.

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) interchangeably with different types of optical discs. Background technique [0002] In recent years, in the optical pick-up device, the short wavelength of the laser light source used as a light source for reproducing information recorded in the optical disc and for recording information on the optical disc has been developed. 420nm laser light source has been practically used. When using these blue-violet laser light sources, in the case of using an objective lens with the same numerical aperture (NA) as DVD (Digital Versatile Disc), it is possible to record 15 to 20 GB of information on a disc with a diameter of 12 cm. When the NA of the element is increased to 0.85, information of 23 to 25 GB can be recorded on an optical disc with a dia...

Claims

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Application Information

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