Optical glass, glass cup for die pressing forming, glass forming body, optical element and manufacture method thereof

An optical glass, glass technology, applied in glass pressing, glass manufacturing equipment, glass molding, etc., can solve problems such as difficult color balance correction

Active Publication Date: 2007-03-28
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the refractive index nd increases to around 2, the spectral transmittance at the short-wavelength end shifts significantly to the long-wavelength side. If such glass is used in an imaging optical system, there is a problem that it is difficult to correct the color balance.

Method used

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  • Optical glass, glass cup for die pressing forming, glass forming body, optical element and manufacture method thereof
  • Optical glass, glass cup for die pressing forming, glass forming body, optical element and manufacture method thereof
  • Optical glass, glass cup for die pressing forming, glass forming body, optical element and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0315] In this example, the refractive index nd is 2.08313, the Abbe number (vd) is 22.23, the liquidus temperature is 1270°C, the viscosity at the liquidus temperature is 0.824dPa·s, and the glass transition temperature is formed by the method shown below. It is 701℃, the density at room temperature is 4.780, and the dynamic viscosity is 1.724×10 -5 m 2 / s, and if it is expressed in mass percentage, it contains 3.59% SiO 2 , 6.24% B 2 o 3 , 32.44% La 2 o 3 , 26.73% TiO 2 , 11.12% Nb 2 o 5 , 6.14% ZrO 2 , 13.74% BaO and 0.00% Sb 2 o 3 A round rod-shaped glass forming body formed of optical glass.

[0316] First, glass raw materials were weighed to obtain optical glass I shown in Table 1, and after being sufficiently mixed, they were introduced into a melting vessel and heated and melted. Secondly, make the fully clarified and uniform molten glass continuously flow out from the outlet of the vertically arranged tube with a viscosity of 0.6dPa·s and at a certain flow...

Embodiment 2

[0348] Using each slow-cooled round rod-shaped glass produced in Example 1, a glass gob for press molding was produced. First, a scribe line is formed on the cut portion of the side surface of the round rod-shaped glass by scribing process. Next, insert the round rod-shaped glass into the high-pressure container so that the part where the scribe line is formed is located in the center of the container. In order to limit the movement in the direction of the central axis, use the rubber sealing ring to clamp the round rod-shaped glass to the opening of the container, and fill the container with water. , so that there are no blisters inside.

[0349] Pressurize in this state so that the water pressure in the container reaches 20 MPa, and the glass is cut perpendicular to the central axis of the round rod-shaped glass at the scribed position. In this way, the round rod-shaped glass is cut at predetermined intervals to form cut pieces.

[0350] Next, the above-mentioned slices we...

Embodiment 3

[0352] The slices produced in Example 2 were ground and ground to produce a glass gob for press molding with a smooth surface.

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Abstract

There is provided a high refractive optical glass capable of performing color balance correction, suitable for the miniaturization and high performance of optical instruments. The optical glass provided comprises borate system containing TiO2 as glass component. After heat treatment or controlling the species and quantity of additives, the transmittance characteristics of said optical glass satisfies the relation formula of (1) (lambada702-3009 multiplied by nd+2842 ellipsis(1)) when the wavelength lambada with 70% exterior transmittance and 10.0 mm thickness is set to 70 nm.

Description

technical field [0001] The present invention relates to an optical glass having a high refractive index suitable for miniaturization and high performance of optical equipment and capable of correcting color balance, a glass gob for press molding formed of the glass, a glass molded body, an optical Components and methods of manufacture. Background technique [0002] Along with miniaturization and high performance of optical devices, glass materials with high refractive index are required. Conventionally, in order to realize a glass with a high refractive index, a glass containing a high concentration of lead in the glass composition as described in Patent Document 1 has been used. [0003] However, since lead is toxic to glass containing a high concentration of lead, it is necessary to consider the impact on the environment, and its use should be controlled. As a component that increases the refractive index, TiO can be used instead of PbO 2 . In order to achieve ultra-hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/064C03C3/068C03B11/08
CPCC03C3/253C03C3/155C03C3/068
Inventor 下西司田岛英身
Owner HOYA CORP
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