Precision press-molding glass preform, optical element and processes for the production thereof
A technology of optical components and preforms, applied in optical components, glass manufacturing equipment, glass pressing, etc.
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Embodiment 1-39
[0225] Weighing oxides, carbonates, sulfates, nitrates, hydroxides, etc., such as SiO 2 、H 3 BO 3 , La 2 o 3 , ZnO, ZnCO 3 , ZrO 2 , Li 2 CO 3etc. as raw materials to obtain 250-300 grams of glass compositions shown in Table 1-1 to Table 1-4. The raw materials weighed in each embodiment are fully mixed to obtain the formulated batch material, and the formulated batch material is placed in a platinum crucible, and the crucible is placed in an electric furnace maintained at 1200-1450 ° C, and the formulated batch material is stirred in the air Melt for 2-4 hours. After melting, the molten glass is cast in a carbon mold of 40×70×15 mm. After the molten glass is gradually cooled to the glass transition temperature, the glass in the mold is immediately placed in an annealing furnace. The glass is annealed in the glass transition temperature range for about 1 hour and cooled in a furnace to obtain an optical glass. When the obtained optical glass was observed with a micros...
Embodiment 40
[0238] Each of the glass preforms obtained in the above-mentioned Examples 1-39 was separately fed into a press mold provided with a carbon-containing film (diamond-type carbon) on the molding surface, and the glass preform and the press mold were heated together until A temperature is reached that gives the glass a viscosity of 105-109. Precise compression molding of the glass preform is carried out with a compression mold under a nitrogen atmosphere with a pressure of 5-15Mpa, and the pressurization time is 10-300 seconds. The precision molded product thus obtained is annealed to obtain an aspherical lens. The resulting lens has a refractive index (nd) and an Abbe's number (vd) equal to those of the corresponding optical glass forming the above-mentioned glass preform.
[0239] According to the above-mentioned method, the shape of the stamper and the weight of the glass preform are determined as required, and in each of the above-mentioned embodiments, various lenses such a...
Embodiment 41
[0241] Each of the glass preforms in Examples 1-39 was preheated to allow the glass to develop 10 4 -10 8 Viscosity temperature, and it is introduced into a SiC stamper preheated to a temperature lower than the above-mentioned preheating temperature and having a molding surface provided with a carbon-containing film (diamond-type carbon film). Precise compression molding of the glass preform is carried out with a compression mold under a nitrogen atmosphere with a pressure of 5-15Mpa, and the pressurization time is 10-300 seconds.
[0242] An aspheric lens was obtained by annealing the thus obtained precise press-molded product. The resulting lens has a refractive index (nd) and an Abbe's number (vd) equal to those of the corresponding optical glass forming the above-mentioned glass preform.
[0243] According to the above-mentioned method, the shape of the stamper and the weight of the glass preform are determined as required, and in each of the above-mentioned embodiments,...
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