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Aspheric surface object lens in use for storing blue light

An aspheric lens and aspheric surface technology, applied in the field of aspheric objective lenses, can solve the problems of image quality degradation, increase in size and weight, increase in servo difficulty, etc., and achieve the effect of good imaging quality and wide field of view

Inactive Publication Date: 2007-05-09
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To meet the above requirements, an optical system composed of multiple spherical lenses can be used, but this will inevitably increase the size and weight of the system, which will not only increase the difficulty of servoing, but also cause a decrease in image quality

Method used

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  • Aspheric surface object lens in use for storing blue light
  • Aspheric surface object lens in use for storing blue light
  • Aspheric surface object lens in use for storing blue light

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Embodiment Construction

[0031] Please refer to FIG. 1 first. FIG. 1 is a schematic diagram of the optical path of the aspheric objective lens of the present invention. As can be seen from the figure, the structure of the aspheric objective lens of the present invention is: it is composed of a main aspheric lens 101 and a slave aspheric lens 102, and contains two aspheric lenses, large and small, which can form an optical readout with a laser, a collimating mirror, a beam splitting prism, etc. Take the system (see Figure 2). Both objectives are meniscus structures, both containing an aspheric and spherical surface. The lens materials are all M-BACD5N (belonging to the HOYA series, with a refractive index of 1.589 and an Abbe number of 61.3). The diameter of the main lens is 4.2-5.1 mm, which is consistent with the size of the objective lens of a common optical head, and the diameter of the slave lens is 2.8-3.3 mm. The numerical aperture is 0.85, the working distance is 0.9-1.2mm, the effective foca...

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Abstract

A non-spherical objective lens used for storing blue light is prepared as forming said objective lens by two different sizes of lenses as both are in meniscus form with one spherical surface and one non-spherical surface; applying numerical aperture of 0.85, blue laser of 405nm and operation distance of 0.6-0.9mm by said objective lens in order to eliminate spherical aberration perfectly and to control wave aberration to be within 0.033lambda.

Description

technical field [0001] The invention relates to an optical disc drive, in particular to an aspheric objective lens suitable for a Blu-ray storage optical head. It consists of two aspheric lenses, which can form an optical reading system with lasers, collimating mirrors, beam splitting prisms, etc. It can be used in the next generation of optical storage technology, mainly to read Blu-ray discs. Background technique [0002] The information age requires highly advanced information storage technology. With the advent of the era of digital products and high-definition televisions, high-density digital versatile discs (hereinafter referred to as HD DVD) and Blu-ray discs (hereinafter referred to as BD) series of next-generation optical disc technologies with larger storage capacity will become the mainstream. Especially BD, its storage capacity can reach 25G, it uses 405nm blue light laser and objective lens with numerical aperture of 0.85, and the thickness of disc protective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B27/00
Inventor 周辉阮灵
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI