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Optical Glass, Preform for Precision Press Molding, and Optical Element

A technology for optical glass and optical components, applied in the field of precision stamping and forming preforms and optical components, can solve the problems of unsatisfactory water resistance and specific gravity of low-dispersion optical glass

Active Publication Date: 2015-09-16
SUMITA OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the optical glasses described in Patent Documents 1 to 5 are still unsatisfactory in terms of water resistance and specific gravity as medium-refractive-index low-dispersion optical glasses that can be precisely press-formed

Method used

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  • Optical Glass, Preform for Precision Press Molding, and Optical Element
  • Optical Glass, Preform for Precision Press Molding, and Optical Element
  • Optical Glass, Preform for Precision Press Molding, and Optical Element

Examples

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example

[0138] The optical glass of the present invention is described in more detail below by examples and comparative examples. However, the present invention is not limited to these examples.

[0139] As materials for optical glass, corresponding oxides, hydroxides, carbonates, phosphates, etc. are vitrified. Then weigh 100g of the vitrified material, mix it thoroughly and put it into a platinum crucible, and heat it in an electric furnace at a temperature of 1200-1500°C for 1-2 hours. Subsequently, the molten product is stirred in time to homogenize it and is refined before being cast into molds which are preheated to the appropriate temperature. The resulting product is gradually cooled in an electric furnace to relieve stress. Thus, the optical glasses of Examples 1-21 and Comparative Examples 1-14 were obtained. For each of the obtained optical glasses, specific gravity, chemical durability (water resistance), refractive index (nd), Abbe number (νd), glass transition tem...

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Abstract

Provided is a medium-refractive-index low-dispersion optical glass that may be precision press-molded, that has a high water resistance, and that has a low specific gravity, as well as a preform for precision press molding and an optical element which use such an optical glass. The optical glass has a composition including, in % by mass, SiO2: 35 to 55%, B2O3: 12 to 27%, Al2O3: 6 to 16%, Li2O: 5 to 12%, MgO: 0 to 10%, CaO: 5 to 17%, ZrO2: 0 to 7%, La2O3: 0 to 7%, ZnO: 0 to 5%, TiO2: 0 to 5%, Nb2O5: 0 to 5%, and Ta2O5: 0 to 5%. SrO and BaO are not included.

Description

technical field [0001] The present invention relates to optical glass, a preform for precision stamping and an optical element. In particular, the present invention relates to a medium-refractive-index low-dispersion optical glass which can be fine-press-molded, which has high water resistance and has a low specific gravity, and also to a preform for fine-press molding using this optical glass and Optical element. Background technique [0002] In recent years, the popularity and development of optical devices has driven the demand for optical glasses with a wide range of characteristics. In particular, medium-refractive-index low-dispersion optical glass is in great demand due to its usability in various optical devices such as digital still cameras and video cameras. In addition, due to the recent rapid development of high-performance products, there is a need for glass suitable for precision press molding through which lenses with complex shapes can be manufactured relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/064C03C3/068
CPCC03C3/064C03C3/097C03C3/093C03C3/091C03C4/20C03C3/095C03C2204/00C03C3/068
Inventor 手塚达也
Owner SUMITA OPTICAL GLASS