Method for manufacturing optical glass, glass base stock for press forming, and method for manufacturing the glass base stock for press forming, and method for manufacturing optical element
A compression molding and optical glass technology, which is applied in glass forming, glass pressing, glass manufacturing equipment, etc., can solve problems such as crucible erosion, optical glass quality degradation, and constituent components entering
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Embodiment 1
[0119] Example 1 (Example of manufacturing optical glass I)
[0120] In order to obtain the glass with the composition of No. 1-11 shown in Table 1 and Table 2, the raw material corresponding to each component was weighed and fully mixed. At this time, the phosphate raw material and the fluoride raw material are not mixed, but are divided into two raw material groups and blended.
[0121] The prepared raw material containing the above-mentioned phosphate raw material was put into a silicon crucible, stirred at 1200°C to melt for 1 hour, and then quenched and pulverized to obtain a cullet. In this melting step, nitrogen is continuously supplied into the silicon crucible, and the atmosphere is maintained as a non-oxidizing atmosphere.
[0122] Then, 10 kg of the cullet was put into a platinum crucible sealed with a lid, and 15 kg of the fluoride-containing compounding raw material was put in at the same time, and the mixture was heated to 900° C. and stirred and melted. Then, a su...
Embodiment 2
[0137] Example 2 (Manufacturing Example of Optical Glass II)
[0138]In order to obtain the glass having the composition of Nos. 12 to 13 shown in Table 3, the raw materials corresponding to each component were weighed and sufficiently mixed. At this time, the phosphate raw material and the fluoride raw material are not mixed, but are divided into two raw material groups and blended.
[0139] Then, optical glass Nos. 12 to 13 were manufactured by the same method as in Example 1. Light rays were incident on each of the obtained optical glasses, and the optical path of the light rays in the glass was observed from the lateral direction. As a result, light scattering due to platinum foreign matter was hardly observed. Therefore, it was confirmed that platinum foreign matter can be prevented from being mixed into the glass blank.
[0140] For the obtained optical glass Nos. 12 to 13, the refractive index (nd), Abbe number (υd), and glass transition temperature (Tg) were measured in th...
Embodiment 3
[0155] Example 3 (Example of manufacturing lens preform by manufacturing method I of glass material)
[0156] Each molten glass formed from the optical glass Nos. 1 to 11 obtained in Example 1 was separated into molten glass lumps of the target preform weight by the following method: the molten glass was flowed out from a platinum tube at a constant flow rate to make The molten glass is dropped or the support is quickly lowered after the tip of the molten glass flow is supported by a support to separate the molten glass. The temperature of the platinum tube is adjusted to allow the glass to flow out stably without devitrification Temperature zone. Then, each obtained molten glass block was received by a receiving mold with a gas ejection port at the bottom, and the glass block was formed while the gas was ejected from the gas ejection port to float the glass block, thereby manufacturing optical glass Nos. 1 to 11 The formed lens preform for precision press molding. By adjusting ...
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