Unlock instant, AI-driven research and patent intelligence for your innovation.

Manufacture of optical glass

An optical glass and manufacturing method technology, applied in glass manufacturing equipment, optics, optical components, etc., can solve problems such as damage to the quality of optical glass, achieve high transmittance in the visible light range, and inhibit glass coloration.

Active Publication Date: 2005-02-23
HOYA CORP
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Any such situation will damag

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Manufacture of optical glass
  • Manufacture of optical glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] pass figure 1 and figure 2 Device fabrication shown as glass composition, expressed in weight %, containing SiO 2 : 25%, TiO 2 : 30%, Nb 2 o 5 : 14% optical glass (refractive index nd is 1.84711, Abbe dispersion coefficient νd is 23.76).

[0088] Specifically, glass raw material is continuously fed into the melting tank 20 from the glass raw material supply part 10, and the molten glass is continuously and sequentially transported to the clarification tank 40 and the operation tank 60, and flows out from the operation tank 60 to form a plate-shaped glass material. . In the clarification tank 40, defoaming is performed at about 1300° C., and in the working tank 60, the temperature is adjusted so that the viscosity becomes about 30 poise.

[0089] At this time, natural gas (CH 4 : 88.5%, C 2 h 6 : 4.6%, C 3 h 8 : 5.4% and C 4 h 10 : 1.5%). Simultaneously, 2 to 8% by volume of oxygen is supplied to the combustion gas as the combustion auxiliary gas of the co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In the manufacturing method of the optical glass containing TiO2or Nb2O5as the glass components, the optical glass in which the wavelength showing 70% spectral transmittance in 10 mm thickness is <=470 nm is manufactured by supplying oxygen with air in a combustion gas supplied to the upper part of a melting vessel 20 housing a glass raw material to heat and melt the glass raw material by the combustion flame.

Description

technical field [0001] The present invention relates to glass compositions comprising TiO 2 or Nb 2 o 5 Manufacturing method of optical glass. Background technique [0002] As a method of heating molten glass raw materials, a method using a combustion flame such as natural gas is known. At this point, the appropriate size of the combustion flame can be formed by adding the appropriate amount of air to the fuel. [0003] In addition, a method of directly using oxygen in fuel combustion is also known. This method can suppress NO compared to when using air x Formation. In addition, there is no nitrogen that does not assist combustion to absorb heat, so thermal efficiency can be improved. [0004] For example, Patent Document 1 describes that by using an oxy-combustion burner, glass raw materials and molten glass are heated in a state where nitrogen gas is substantially absent, thereby improving the thermal efficiency of a melting furnace while substantially preventing th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B1/00C03B5/04C03B5/16C03B5/173C03B5/193C03B5/235C03B5/24C03C4/00
CPCC03B5/04C03B5/193C03B5/2353Y02P40/50
Inventor 下西司
Owner HOYA CORP