Title:
METHOD FOR FORMING OPTICAL GLASS ELEMENT AND APPARATUS FOR FORMING
Document Type and Number:
Japanese Patent JP3155395
Kind Code:
B2
Abstract:
PURPOSE: To prevent the surface accuracy from being worsened and melt sticking from occurring due to partial peeling and shorten the forming cycle by applying a compressive stress to a glass material in a forming mold and then moderating the compressive stress.
CONSTITUTION: A glass material 1 is charged onto a bottom force 3. After the glass 1 and the force 3 reach a specific temperature, a pressure is applied from a top force 2 apply a compressive stress until a flange part (2a) of the top force 2 is brought into contact with a body mold 5. A compressive stress is then applied from a lower rod 6 to the bottom force 3 and glass material 1 is subsequently cooled to a temperature at which the viscosity thereof reaches 109 to 1013dPa.s. The lower rod 6 is then lowered to relax the compressive stress at ≤3000kPa/sec pressure releasing rate. The top force 2 is subsequently lifted to peel the bottom force 3 and a lens 4 with a mold releasing plate 7.
Inventors:
Omori, Masaki
Mashige, Masashi
Tomita, Masayuki
Yamamoto, Kiyoshi
Nomura, Takeshi
Mashige, Masashi
Tomita, Masayuki
Yamamoto, Kiyoshi
Nomura, Takeshi
Application Number:
JP13777593A
Publication Date:
April 09, 2001
Filing Date:
June 08, 1993
Export Citation:
Assignee:
CANON INC
International Classes:
C03B11/00; C03B11/08; C03B11/12; (IPC1-7): C03B11/00
Attorney, Agent or Firm:
金田 暢之 （外２名）