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Optical glass, preform for precision press forming and optical element

A technology of optical glass and optical components, applied in optical components, glass molding, glass pressing, etc., can solve the problems of unsatisfactory specific gravity, abrasion resistance and devitrification stability of optical glass, etc.

Pending Publication Date: 2021-01-01
SUMITA OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the optical glasses described in Patent Documents 1 to 3 are still not satisfactory in terms of specific gravity, degree of abrasion, and stability against devitrification

Method used

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Examples

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example

[0136] Hereinafter, the optical glass of the present disclosure will be described in more detail through examples and comparative examples. However, the present disclosure is not limited to these examples.

[0137] As the material of the optical glass, oxides, phosphates, fluorides and the like are used. Obtain optical glass with the compositions of Examples 1 to 40 and Comparative Examples 1 to 21 shown in Tables 1 to 6 in the future, these materials are vitrified (vitrify), and weigh 100g vitrified material, it is fully mixed, and loaded into a platinum crucible and heated in an electric furnace at 1000°C to 1300°C for 1 to 2 hours. Subsequently, the molten product is stirred in time to homogenize it and is refined, followed by casting 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 to 40 and Comparative Examples 1 to 21 were obtained....

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PUM

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Abstract

The present invention provides optical glass, a preform for precision press forming and an optical element. The optical glass has a composition containing the following components, by cation mole%, P5+: 36-40%, Al3+: 11-16%, Mg2+: 11-19%, Ca2+: over 0% and 2% or less, Sr2+: 0-4%, Ba2+: 25-31%, Z2+: 0% or more and less than 2.4%, Y3+: 2-7% and the total amount: 3-7% of Zn2+ and Y3+; and by anion mole%, O2-: 74-78% and F-: 22-26%. Li+, Na+, K+, La3+ and Gd3+, are not included. The optical galss has a refractive index (nd) of 1.582 to 1.598 and an Abbe number (vd) of 67 to 69.

Description

[0001] This application is a divisional application of an invention patent application with an application date of April 16, 2015, an application number of 201510182193.1, and an invention title of "Optical Glass, Preforms and Optical Elements for Precision Stamping". technical field [0002] The present disclosure relates to optical glass, a preform for precision stamping, and an optical element. Specifically, the present disclosure relates to fluorophosphate optical glass having low specific gravity, low degree of abrasion, and high stability against devitrification and also relates to preforms and optical elements for precision press molding using such optical glass. Background technique [0003] In recent years, the popularity and development of optical devices has driven the need for optical glasses with a wide range of properties. In particular, fluorophosphate optical glass is in great demand due to its characteristics such as low dispersion, abnormal dispersion, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/247C03B11/08C03B19/02G02B1/00
CPCC03C3/247
Inventor 手塚达也
Owner SUMITA OPTICAL GLASS