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A technology of optical glass and optical components, applied in the field of optical components, can solve the problems of low Tg value, short mode life, devitrification resistance, etc.
Inactive Publication Date: 2007-05-30
KONICA MINOLTA OPTO
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[0005] However, the optical glasses disclosed in Patent Documents 1 to 3 do not have satisfactorily low Tg values, and therefore due to T L Still high, there are still problems with short die life and devitrification resistance
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Embodiment 1-10
[0046] Embodiment 1-10, comparative example 1-3
[0047] Samples were produced in the following manner. Common glass raw materials such as oxide raw materials, carbonates, nitrates, etc. were blended together to provide the target ingredients shown in Table 1, and then thoroughly mixed together in a powder state to prepare admixtures. Then, the blend is added to a melting furnace heated to 1000°C to 1300°C, melted, clarified, then stirred, homogenized, poured into a preheated iron mold or carbon mold, and then annealed. Subsequently, the refractive index (n d ) and Abbe number (v d ), glass transition temperature (Tg), linear thermal expansion coefficient (α), liquidus temperature (T L ) and the viscosity at the liquidus temperature. Table 1 also shows the results of this measurement.
[0048] Retest Example 1 of Patent Document 1 (JP-A-H3-5341) as Comparative Example 1, retest Example 1 of Patent Document 2 (JP-A-H6-107425) as Comparative Example 2, retest Patent Documen...
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Abstract
Optical glass for press-molding of the present invention includes the following glass components in % by weight: 10 to 38% of SiO2, 15 to 40% of B2O3, 4 to 14% of Li2O, 0 to 5% (zero inclusive) of Na2O, 0 to 5% (zero inclusive) of K2O, where a total content of Li2O+Na2O+K2O is equal to 4 to 20%, and 0 to 10% (zero inclusive) of MgO, 0 to 10% (zero inclusive) of CaO, 0 to 10% (zero inclusive) of BaO, 0 to 10% (zero inclusive) of SrO, and 15 to 39% of ZnO, where a total content of MgO+CaO+BaO+SrO+ZnO is equal to 15 to 39%. Here, in view of improvement in glass stability and adjustment of optical constants, one or two or more kinds of the following glass components may be further contained in % by weight, 0 to 20% of Al2O3, 0 to 5% of Y2O3, 0 to 5% of La2O3, 0 to 5% of Gd2O3, 0 to 5% TiO2, 0 to 5% of ZrO2, 0 to 5% of Nb2O5, 0 to 5% of Ta2O5, 0 to 10% of WO3, 0 to 2% of Sb2O3, and 0 to 5% of Bi2O3.
Description
technical field [0001] The present invention relates to an optical glass and an optical element formed from the optical glass, and more particularly to an optical glass suitable for compression molding and an optical element formed from the optical glass. Background technique [0002] As a method of manufacturing glass optical elements such as glass lenses, the so-called compression molding method has been widely used in recent years. Or glass above the yield temperature, because this method requires fewer manufacturing steps than the conventional molding method of polished glass, so it can be manufactured in a short time and at a lower cost. [0003] Compression molding methods can be broadly classified into reheating methods and direct extrusion methods. In the reheat method, gob preforms or ground preforms (ground preforms) roughly in the form of the final product are first prepared, these preforms are then reheated to the softening point or above, and then used The hea...
Claims
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