发明名称 |
Glass and optical glass element |
摘要 |
Disclosed herein is a glass whose viscosity index (A) defined as a value obtained by dividing the viscosity of the glass at the liquidus temperature thereof by the liquidus temperature of the glass is in the range of 0.0004 to 1.5. Such a glass is melted in a melting furnace equipped with a nozzle, and the molten glass is dropped from the nozzle intermittently and regularly to obtain glass droplets. The glass droplet naturally dropped from the nozzle is received by a receiving mold to form a glass gob. The glass gob can be used as a preform for reheating molding. Further, it is possible to produce an optical glass element having no plane defect such as a shear mark by press-molding a hot glass gob with an upper mold just after the glass gob is received by the receiving mold.
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申请公布号 |
US2007142200(A1) |
申请公布日期 |
2007.06.21 |
申请号 |
US20060603918 |
申请日期 |
2006.11.22 |
申请人 |
MORI TOSHIHARU;OOGAKI AKIO;KAMADA YOSHIHIRO |
发明人 |
MORI TOSHIHARU;OOGAKI AKIO;KAMADA YOSHIHIRO |
分类号 |
C03C3/00 |
主分类号 |
C03C3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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