Method of manufacturing a lens element

A method for producing an optical lens element, the method comprising:

• providing an injection mold;
• providing a final contour mold, the final contour mold comprising a lower mold and an upper mold;
• providing liquefied transparent plastic
• injecting the liquefied transparent plastic into the first injection mold to form a pre-lens element;
• cooling the pre-lens element such that the transparent plastic solidifies;
• subsequently heating a surface of the pre-lens element intended as an optically effective surface in such a way that the solidified plastic at the surface of the pre-lens element intended as an optically effective surface is moldable to a depth of not more than 1000 micrometers;
• pressing the pre-lens element in a final contour mold to form the lens element with the optically effective surface, wherein at least 90% of the pre-lens element has a temperature below transition/transformation temperature (TG) of the transparent plastic when the pre-lens element is pressed in the final contour mold.

A method for producing an optical lens element, the method comprising:

• providing a first injection mold;
• providing a second injection mold;
• providing a final contour mold;
• providing transparent plastic;
• liquefying the transparent plastic;
• injecting the liquefied transparent plastic into the first injection mold to form a preform;
• subsequently cooling the preform outside the first injection mold;
• placing the preform in the second injection mold;
• over molding the preform with the liquefied transparent plastic injected into the second injection mold to form a pre-lens element;
• cooling the pre-lens element such that the transparent plastic solidifies;
• subsequently heating a surface of the pre-lens element intended as an optically effective surface in such a way that the solidified plastic at the surface of the pre-lens element intended as an optically effective surface is moldable;
• pressing the pre-lens element in the final contour mold to form the lens element with the optically effective surface;
• wherein the surface of the pre-lens element intended as an optically effective surface is moldable to a depth of not more than 1000 micrometers.