Method and apparatus for molding parts having an aspherical surface
AssigneeCarl-Zeiss-Stiftung
InventorAlbert Kreuttner
Life of this patent
Estimating the term…
Abstract
Molded thermoplastic parts with aspherical surfaces are produced with molds whose molding-cavity surfaces are of spherical development and are elastically deformable. The spherical surfaces are so deformed in specific manner by the pressure of the thermoplastic material during the molding process that predetermined aspherical surfaces are produced. Aspherical surfaces of non-rotational symmetry are produced by additional, yieldably mounted auxiliary pistons which are connected to a hydraulic system.
Claims13
A method of forming a molded thermoplastic product having opposed surfaces at least one of which is aspherical, which method comprises selecting for the formation of said one surface a molding plate of elastically deformable material and having a spherical surface, selecting a mold having a molding-plate support for said plate in spaced opposed relation with a cavity formation for the other of said surfaces, the selected mold having a recessed region behind said support, mounting the selected plate on said support and over the recessed region, injecting thermoplastic material to fill said mold between said plate and said cavity formation and under sufficiently elevated pressure to elastically deform the surface of said plate to asphericity and to complete the molding of the product to such asphericity before removing the product from the mold.
A method of forming a molded thermoplastic product with opposed aspherical surfaces, which method comprises selecting two molding plates of elastically deformable material and having spherical surfaces, selecting a mold having a molding-plate support for each of said plates in spaced opposed relation and with a recessed region behind each of said supports, mounting the selected plates in said supports and over the respective recessed regions, injecting thermoplastic material to fill said mold between said plates and under sufficiently elevated pressure to elastically deform the surfaces of said plates to asphericity and to complete the molding of the product to such asphericity before removing the product from the mold.
Dependencies are inferred from the claim text.