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Optical glass

A kind of optical glass and glass technology, applied in optics, optical components, instruments, etc., can solve problems such as difficulties in making glass materials

Active Publication Date: 2017-08-25
NIPPON ELECTRIC GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is a problem that it is difficult to make nitrous material during droplet formation.

Method used

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  • Optical glass
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Hereinafter, the present invention will be described based on examples, but the present invention is not limited by these examples.

[0055] Tables 1 to 3 show examples (sample Nos. 1 to 22) and comparative examples (sample Nos. 23 and 24) of the present invention.

[0056] [Table 1]

[0057]

[0058] [Table 2]

[0059]

[0060] [table 3]

[0061]

[0062] Each sample was prepared as follows. First, glass raw materials were prepared so as to have the compositions shown in the table, and melted at 1400° C. for 2 hours using a platinum crucible. After melting, the molten glass was flowed out on a carbon plate, annealed, and then a sample suitable for each measurement was produced.

[0063] For the obtained sample, the refractive index (nd), Abbe number (νd), glass transition temperature (Tg), droplet forming temperature (Tw), liquidus temperature (T1), operating temperature range (ΔT ). The results are shown in Tables 1-3.

[0064] The refractive index is re...

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Abstract

The present invention provides an optical glass that has desired optical properties, is excellent in devitrification resistance, and is excellent in mass productivity. The optical glass is characterized in that it is composed of SiO2-Nb2O5-TiO2-based glass with a refractive index (nd) of 1.75 to 1.95 and an Abbe number (νd) of 15 to 35, and an operating temperature range (ΔT) = (100.5 Poise temperature - liquidus temperature) is above 20°C. The glass composition includes 15 to 45% of SiO2, 15 to 40% of Nb2O5 (excluding 40%), and 1 to 30% of TiO2 in mass %.

Description

technical field [0001] The present invention relates to an optical glass suitable as an optical lens for a digital camera, a video camera, or a lens for optical communication. Background technique [0002] In recent years, digital still cameras and video cameras have been increasing in performance, specifically, miniaturization, high magnification, and high definition. In order to achieve such high performance, glass for optical lenses used in digital cameras and video cameras is often required to have characteristics such as high refractive index, high dispersion, and abnormal dispersion. [0003] As a glass satisfying these characteristics, for example, SiO having a refractive index (nd) of 1.78 or more and an Abbe number (νd) of 30 or less has been proposed. 2 -Nb 2 o 5 Glass-like (for example, refer to Patent Document 1). This glass can also be used as a lens for optical communication due to its properties such as high refractive index and high weather resistance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/062C03C3/076C03C3/078C03C3/097G02B1/00
CPCC03C3/062C03C3/064C03C3/097
Inventor 佐藤史雄
Owner NIPPON ELECTRIC GLASS CO LTD