Title:
METHOD FOR MANUFACTURING POROUS GLASS, AND METHOD FOR MANUFACTURING OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2012/117686
Kind Code:
A1
Abstract:
A method for manufacturing a porous glass includes: forming a phase-separated glass by heating at a temperature in a range of 300 to 500 degrees Celsius for 3 to 50 hours for phase separation of a glass body in which the concentration of SiO2 is 50 to 70 percent by weight, the concentration of B2O3 is 15 to 40 percent by weight, the concentration of Li2O is 1.0 to 8.0 percent by weight, the concentration of Na2O is 2.0 to 8.0 percent by weight, the concentration of K2O is 0.3 to 5.0 percent by weight, the total concentration of Li2O, Na2O, and K2O is 3.5 to 15 percent by weight, and the ratio of the concentration of K2O to the total concentration of Li2O, Na2O, and K2O is 0.10 to 0.30; and forming a porous glass by etching the phase-separated glass.
Inventors:
KOKETSU NAOYUKI (JP)
ZHANG ZUYI (JP)
KOTANI YOSHINORI (JP)
SUGIYAMA AKIRA (JP)
TAKASHIMA KENJI (JP)
ZHANG ZUYI (JP)
KOTANI YOSHINORI (JP)
SUGIYAMA AKIRA (JP)
TAKASHIMA KENJI (JP)
Application Number:
PCT/JP2012/001101
Publication Date:
September 07, 2012
Filing Date:
February 20, 2012
Export Citation:
Assignee:
CANON KK (JP)
KOKETSU NAOYUKI (JP)
ZHANG ZUYI (JP)
KOTANI YOSHINORI (JP)
SUGIYAMA AKIRA (JP)
TAKASHIMA KENJI (JP)
KOKETSU NAOYUKI (JP)
ZHANG ZUYI (JP)
KOTANI YOSHINORI (JP)
SUGIYAMA AKIRA (JP)
TAKASHIMA KENJI (JP)
International Classes:
C03C11/00; C03B32/00
Foreign References:
| US4665039A | 1987-05-12 | |||
| DE4119380A1 | 1992-01-09 | |||
| JPS59164648A | 1984-09-17 | |||
| JP2011041738A | 2011-03-03 | |||
| JP2012014366A | 2012-01-19 |
Other References:
TETSURO IZUMIYA: "New Glass and Its Physical Properties", 1987, MANAGEMENT SYSTEM LABORATORY. CO., LTD., pages: 47 - 50
Attorney, Agent or Firm:
ABE, Takuma et al. (30-2 Shimomaruko 3-chome, Ohta-k, Tokyo 01, JP)
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Claims: