Method and device for producing technical glass parts for optical applications
AssigneeDocter Optics SE
InventorsPeter Mühle, Wolfram Wintzer
Life of this patent
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Abstract
Disclosed is a method for producing a technical glass part, particularly meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens, wherein a blank including a cast-on section is produced using an injection molding process, wherein the blank is cooled down and subsequently heated, and wherein the blank subsequently is blank molded, particularly on both sides, into a technical glass part meeting high requirements with respect to contour accuracy and surface quality, particularly a precision lens.
Claims32
A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
- producing a blank from glass;
- inverting a temperature gradient of the blank by cooling at a temperature between 20K and 200K beneath the transformation temperature TG of the glass of the blank and subsequently heating the blank at a temperature between 1000° C. and 1250° C.;
- and
- subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
- producing a blank from glass;
- inverting a temperature gradient of the blank by cooling and subsequently heating the blank at a temperature between 1000° C. and 1250° C., wherein the blank is cooled such that the temperature of the blank before the heating is in the range of TG−80K to TG+30K;
- and
- subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
- producing a blank from glass;
- inverting a temperature gradient of the blank by cooling and subsequently heating the blank such that the viscosity at the surface of the blank is at least 105 Pas lower than the viscosity of the core of the blank;
- and
- subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
- producing a blank from glass;
- inverting a temperature gradient of the blank by cooling and subsequently heating the blank at a temperature between 1000° C. and 1250° C. such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 105.5 Pas and 107 Pas;
- and
- subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
A method of blank molding a headlight lens for a motor vehicle headlight, the method comprising:
- producing a blank from glass;
- inverting a temperature gradient of the blank by cooling at a temperature between 70K and 150K beneath the transformation temperature TG of the glass of the blank and subsequently heating the blank such that its surface temperature assumes a temperature corresponding to a temperature at which the glass of the blank has a viscosity between 105 Pas and 108 Pas;
- and
- subsequently blank molding the headlight lens from the blank for achieving a desired contour of the lens without post-treatment of the contour.
Dependencies are inferred from the claim text.