Precisely pressed optical glass

A kind of optical glass, precise technology, applied in the field of optical glass, can solve the problems of poor glass devitrification resistance, unfavorable batch production, poor glass transmittance, etc., to achieve good devitrification resistance, excellent transmittance, liquid The effect of low phase temperature

Active Publication Date: 2006-05-17
CDGM OPTICAL GLASS
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Problems solved by technology

[0006] Japanese patent publication 2577794 discloses a kind of ZnO-B 2 o 3 -Nb 2 o 5 -SiO 2 System precision pressed glass, but the zinc-boron system glass has poor devitrification resistance and is easy to react with corundum refractory materials, which is not conducive to mass production
[0007] CN95103393.X provides a SiO 2 -TiO 2 -ZrO 2 -K 2 O-RO (R stands for alkaline earth metal) optical glass, but the glass contains more TiO 2 , so the transmittance of the glass in the short-wave band region is poor

Method used

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Embodiment Construction

[0011] SiO 2 Is the main component of glass, SiO 2 It can increase the viscosity of glass and improve the resistance to devitrification of glass. When its content is less than 8%, the transmittance and devitrification resistance of the glass are poor, and if it exceeds 30%, the refractive index of the glass decreases.

[0012] B 2 o 3 It is an essential component of glass. When its content is lower than 6%, the melting performance of the glass is poor, and the devitrification resistance is not ideal. If it is higher than 25%, the softening temperature of the glass is high.

[0013] ZnO is beneficial to reduce the softening temperature of the glass. When the content of ZnO is less than 8%, the softening temperature of the glass is high. If it is higher than 30%, the crystallization tendency of the glass increases.

[0014] Nb 2 o 5 It can increase the refractive index of the glass. When the content is lower than 0.5%, the transmittance of the glass is poor. When the conte...

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PUM

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Abstract

The present invention provides one kind of precisely pressed optical glass. The optical glass consists of SiO2 8-30 wt%, B2O3 6-25 wt%, ZnO 8-30 wt%, Nb2O5 0.5-19 wt%, BaO 5-26 wt%, Li2O 0.5-7 wt% and ZrO2 1-6 wt% chemically. The optical glass of the present invention has refractivity of 1.65-1.74, Abbe number of 36-45, conversion temperature lower than 500 deg.c, high chemical stability, low liquid phase temperature, high devitrification resistance, high light permeability and low specific weight, and is especially suitable for precise mold pressing to form aspherical lens, spherical lens and other optical elements.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.65-1.74 and an Abbe number of 36-45. The glass is suitable for optical components such as precision molded aspherical lenses. technical background [0002] With the fierce competition and development of the optoelectronic product market, high-volume, low-cost manufacturing of optical components is the goal of every optical material and optical component manufacturer. The use of precision molding technology (including direct pressing method and secondary pressing method) can reduce raw material consumption, greatly reduce the amount of mechanical processing of optical components, thereby reducing manpower and material costs, and can achieve stable batch production. environmental pollution. On the other hand, with the increasing popularity of digital cameras, digital video cameras and camera phones in recent years, the optical system is required to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/066
Inventor 匡波
Owner CDGM OPTICAL GLASS
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