Title:
PHOSPHATE GLASS FOR PRECISION MOLDING, OPTICAL ELEMENT USING THE SAME, AND PRODUCTION OF OPTICAL ELEMENT
Document Type and Number:
Japanese Patent JP3835718
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To miniaturize an image pickup device utilizing a solid image pickup element and reduce the production cost by making the phosphate glass include a specific amount of phosphorus oxide and copper oxide.
SOLUTION: This phosphate glass for precision molding is obtained by mixing 35-50 wt.% phosphorus oxide with 17-48 wt.% zinc oxide, 0-18 wt.% alkali metal oxide comprising 0-5 wt.% lithium oxide, 0-10 wt.% sodium oxide, 0-18 wt.% potassium oxide and 0-15 wt.% cesium oxide and 0-15 wt.% alkaline earth metal oxide comprising 0-5 wt.% magnesium oxide, 0-7 wt.% calcium oxide, 0-7 wt.% strontium oxide and 0-10 wt.% barium oxide (with the provide that total amount of the alkali metal oxide and the alkaline earth metal oxide is 1-35 wt.%), 0-5 wt.% aluminum oxide, 0-7 wt.% scandium oxide, 0-20 wt.% lead oxide and 0.2-10 wt.% copper oxide so that total content thereof becomes ≥80 wt.% and heating and melting the mixture at 900-1,280°C and carrying out stirring, defoaming and homogenization of the mixture. The phosphate glass has ≤500°C yield point.
Inventors:
Okuma grandchild
Application Number:
JP7195598A
Publication Date:
October 18, 2006
Filing Date:
March 20, 1998
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
C03C4/08; G02B5/22; C03B11/00; C03B11/08; C03C3/16; C03C3/17; G02B1/00; G02B5/18; (IPC1-7): C03C4/08; C03B11/00; C03B11/08; C03C3/16; C03C3/17; G02B1/00; G02B5/18; G02B5/22
Domestic Patent References:
| JP9100136A | ||||
| JP212743A | ||||
| JP7281021A | ||||
| JP7267673A | ||||
| JP7165436A |
Attorney, Agent or Firm:
Shizuo Nakamura
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