Title:
PRODUCTION OF GLASS GOB FOR FORMING OPTICAL ELEMENT
Document Type and Number:
Japanese Patent JP3703276
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To surely obtain glass gobs of desired shapes adapted as a glass blank for forming optical elements by a common receiving mold.
SOLUTION: This forming stage supplies gas to the rear surface of the porous receiving mold 1 and receives molten glass on the receiving surface of the receiving mold 1 in the state of ejecting the gas from the receiving surface of the receiving mold 1 through the porous receiving mold 1, holds the molten glass afloat by the gas ejected from the receiving surface and forms the glass gob 6 in a contactless state. In such a case, the molten glass is press formed by setting the shape of the receiving surface and the amt. of the molten glass in such a manner that the diameter: &phiv A of the ejection part of the gas to be ejected from the receiving surface and the diameter: &phiv B of the part to be formed with the shape of the glass gob 6 on the receiving surface and the desired diameter: &phiv C of the glass gob 6 to be formed attains a relation 0.7x&phiv <&phiv c and &phiv C<1.3x&phiv B.
Inventors:
Masayuki Tomita
Execution courage
Hiroyuki Kubo
Mizukazu
Execution courage
Hiroyuki Kubo
Mizukazu
Application Number:
JP33542397A
Publication Date:
October 05, 2005
Filing Date:
December 05, 1997
Export Citation:
Assignee:
Canon Inc
International Classes:
C03B7/082; C03B7/14; C03B11/00; C03B19/02; C03B40/04; (IPC1-7): C03B11/00; C03B7/14
Domestic Patent References:
| JP10310439A | ||||
| JP8133758A |
Attorney, Agent or Firm:
Jyohei Yamashita