Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1992-06-22
1993-07-20
Woodard, Joye L.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65 64, 65 85, 65275, C03B 2302
Patent
active
052288943
ABSTRACT:
A method for press-forming a glass preform includes the steps of applying positioning pressure to an upper mold as the temperature of the upper mold and a lower mold increase to set values, maintaining a first temperature difference between the upper and lower molds of at least 10.degree. C. and increasing the temperature of the glass preform to a value above its glass transition temperature. Additional steps include cooling the upper and lower molds at a rate of 30.degree. to 100.degree. C. per minute while maintaining a temperature difference between the upper and lower molds at at least the first temperature difference, applying pressure to the lower mold, and opening the upper and lower molds to release the formed optical element after the temperatures of the upper and lower molds decrease to below a set value and a temperature difference between the upper and lower molds becomes greater than the first temperature difference.
REFERENCES:
patent: 3973942 (1976-08-01), Coen et al.
patent: 4481023 (1984-11-01), Marechal et al.
patent: 4778505 (1988-10-01), Hirota et al.
patent: 4836838 (1989-06-01), Hirota et al.
patent: 4915720 (1990-04-01), Hirota et al.
patent: 5032160 (1991-07-01), Murata et al.
Nomura Takeshi
Ohmori Masaki
Sato Bunryo
Yamamoto Kiyoshi
Canon Kabushiki Kaisha
Woodard Joye L.
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