Title:
METHOD FOR MOLDING OPTICAL ELEMENT OF GLASS
Document Type and Number:
Japanese Patent JP3162180
Kind Code:
B2
Abstract:
PURPOSE: To excellently press mold optical elements of glass having large difference in thickness in a short time.
CONSTITUTION: A blow tube 3 in an upper mold and a blow tube 32 in a lower mold through which a cooling nitrogen gas is introduced are set in the upper mold 20 and the lower mold 26. The temperature at the central part, for pressing the thick part of a glass optical element to be molded, of the upper and the lower molds 20 and 26 is made lower than that of a peripheral part for pressing the thin part by a nitrogen gas. The cooling is previously carried out before press molding of the glass material. Then, the heated and softened glass material is transported to between the upper mold 20 and the lower mold 26 having a temperature distribution and pressed to mold a glass optical element. During cooling the optical element under pressure, the amount of heat conducted from the thick part to the upper and the lower molds 20 and 26 is increased, cooling of the thick part is promoted and the temperature of the whole glass optical element is uniformed. Consequently, the molding time is shortened and strain will not occur in the glass optical element during cooling.
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Inventors:
Hiroshi Ito
Application Number:
JP12687092A
Publication Date:
April 25, 2001
Filing Date:
April 20, 1992
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
C03B11/00; C03B11/12; (IPC1-7): C03B11/12
Domestic Patent References:
| JP63107822A | ||||
| JP483725A | ||||
| JP2133325A | ||||
| JP524858A | ||||
| JP2111635A | ||||
| JP255235A | ||||
| JP62191128A |
Attorney, Agent or Firm:
Takeshi Nara