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Optical element

A technology of optical components and thermosetting resins, applied in the direction of optical components, optics, optical recording heads, etc., can solve the problem of light transmittance decline and other problems

Inactive Publication Date: 2007-08-08
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, there is a problem of decreased "light transmittance" in optical components containing fine particles

Method used

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  • Optical element
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Embodiment Construction

[0026] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the scope of the present invention is not limited to the examples given in the embodiments and drawings, although various limitations for preferably carrying out the invention are provided for the embodiments.

[0027] FIG. 1 is a schematic structural plan view of the optical pickup device PU.

[0028] As shown in the figure, the optical pickup unit PU is equipped with three kinds of semiconductor laser oscillators LD1, LD2, and LD3 as light sources.

[0029] When recording / reproducing information using the BD 10 as a recording medium, the semiconductor laser oscillator LD1 emits light beams having a specific wavelength of 350nm to 450nm (for example, 405nm and 407nm). In this embodiment, the thickness of the protective layer of the BD 10 is 0.6 mm.

[0030] When the DVD 20 is used as a recording medium for recording / reproducing inform...

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Abstract

Disclosed is an optical element that has high quality with respect to heat resistance and light resistance, as well as high quality with respect to light transmittance. The optical element includes a thermosetting resin and fine particles, and difference between refractive index of the thermosetting resin n1 and refractive index of the fine particles n2, |n1- n2| satisfies a condition of 0<=|n1 - n2|<=0.1.

Description

technical field [0001] The present invention relates to an optical element, in particular to an optical element preferably used as a lens of an optical pickup device. Background technique [0002] Conventionally, glass lenses and plastic lenses are used as optical elements of the optical pickup device. Such optical elements are, for example, objective lenses, collimator lenses and the like. In particular, plastic lenses are easy to mold and thus are superior to glass lenses in terms of manufacturing cost. Therefore, plastic lenses are widely used for optical elements. As for the plastic optical element of the optical pickup device, thermoplastic resin is generally used. However, thermoplastic resins are easily deformed by heat, so there is a problem of low quality in terms of "heat resistance". In particular, in recent years, an optical pickup device using a blue-violet laser light having a higher recording density than conventional CDs and DVDs has been developed. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/04G02B3/00G02B13/00G11B7/135
CPCG11B7/1374G02B3/00G11B7/22G11B2007/0006C08K3/0033G11B7/1353G02B5/1876C08K3/013G02B1/04G02B13/18
Inventor 渡边大辅村上修二
Owner KONICA MINOLTA OPTO