Molding method for optical element

Details Molding method for optical element Molding method for optical element

1991-04-29

1992-12-22

Schor, Kenneth M.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

425808, 65111, 65286, 65 64, 65 39, 65 85, C03B 2300

Patent

active

051731002

ABSTRACT:
A method of molding an optical element by pressing glass material uses a cavity composed of a pair of mold members and a side mold member. Either or both of the pair of mold members are rendered slidable along the axial direction of the optical element within the side mold member used during the pressurized molding operation, so that the pair of mold members move in close contact with the contracting glass along the axial direction in the side mold member, during the cooling subsequent to the pressurized molding due to adhesion between the contracting glass and either or both of the pair of mold members. The contraction of the glass during the cooling phase is limited by the adhesive force between the glass and the mold members when at least one of the pair of mold members traverses a gap and reaches a limit of travel; thus tension will be created in the glass.

REFERENCES:
patent: 3900328 (1975-08-01), Parsons et al.
patent: 4481023 (1984-11-01), Marechal et al.
patent: 4629489 (1986-12-01), Hirota et al.
patent: 4778505 (1988-10-01), Hirota et al.

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