Optical glass

A technology of optical glass and glass, which is applied in the fields of optics, optical components, glass molding, etc., can solve problems such as the inability to maintain the precision surface of metal molds, and achieve the effect of superior devitrification resistance and low glass transition temperature

Inactive Publication Date: 2008-10-08
OHARA
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AI Technical Summary

Problems solved by technology

[0005] However, when performing precision press molding, the metal mold is kept in a reducing atmosphere in order to prevent oxidation. Therefore, if lead oxide is contained in the glass component, the reduced lead will deposit on the surface of the glass and adhere to the surface of the metal mold. The problem of maintaining the precision surface of the metal mold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～45

[0119] Regarding Examples 1 to 45 of the optical glass of the present invention, together with the composition, the refractive index (n d ), Abbe number (ν d ), glass transition temperature (Tg), glass softening point (Ts) and wavelength (λ 70％ ) are shown in Table 1 to Table 6. Common raw materials for optical glass such as various corresponding oxides, hydroxides, carbonates, nitrates, and fluorides were used as raw materials for various components, and the raw materials were weighed according to the combination ratio of each example, and the raw materials were mixed. Put it into a platinum crucible, melt it at 1000-1250°C for 3-5 hours according to the meltability of the composition, clarify, stir until homogenized, cast it into a metal mold, etc., and slowly cool it to make optical glass. In addition, the composition of each component in a table|surface is represented by mole percentage (Mol%).

[0120] The refractive index and Abbe's number were measured in accordance ...

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Abstract

The present invention provides a novel optical glass, which is B2O3-TeO2-La2O3 composed of glass with good resist-losing of transparency at the same time, having optical constant (refractive index, abbe number and so on) required by aspheric lens and so on, having low glass transition temperature, and being suitable for accurate compression molding.The optical glass is characterized in that: mole percentage (Mol%) based on oxide, having 5-60% B2O3, and having 0.2-60% TeO2.In addition, refractive index (nd) being 1.80-2.20, abbe number (Gammad) being 16-40 optical constant, and glass transition temperature (Tg) below 680 EDG C.

Description

technical field [0001] The present invention relates to an optical glass, in particular to an optical glass with high refractive index, high dispersion, and low glass transition temperature (Glass Transition Temperature) (Tg), which is suitable for precision press molding (compression molding). Background technique [0002] In recent years, due to the emergence of digital cameras, machines using optical systems have rapidly developed towards high integration and high performance. The industry has continuously increased the requirements for high precision, light weight, and miniaturization of optical systems. In order to achieve this requirement, use The optical design of aspheric lens has gradually become the mainstream. Therefore, in order to stably supply a large number of aspheric lenses using high-performance glass at a relatively low cost, the industry pays attention to the molding technology that directly forms the optical surface without grinding and grinding processe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/14C03C3/15C03B11/06G02B1/00C03C3/064C03C3/068
CPCC03C3/155C03C3/068
Inventor 付杰
Owner OHARA
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