Injection molding apparatus and method for manufacturing an ophthalmic lens mold through injection molding

US11794386B2 · kind B2 · utility

Assignee

• ALCON INC. · CH

Inventors

• Thomas Tonn · Aschaffenburg, DE
• Jan Bernard · Niedernberg, DE
• Halina Heidrich · Kahl am Main, DE
• Eduard Jetzlaff · Schollbrunn, DE
• Yasin Acikgoez · Münster, DE
• Maricel Teresa Repetto · Aschaffenburg, DE
• Matthias Schwab · Amorbach, DE

Key dates

• Filing date: Nov 25, 2019
• Grant date: Oct 24, 2023
• Expiry date: Feb 24, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2011/0041
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An injection molding apparatus for manufacturing an ophthalmic lens mold having a front surface comprising a lens forming portion and a rear surface, comprises a first molding tool and a second molding tool. The first and second molding tools are movable towards and away from each other between a closed position and an open position. In the closed position the first mold forming portion of the first molding tool and the second mold forming portion of the second molding tool define a cavity between them corresponding in shape to the shape of the ophthalmic lens mold. The surface of the second mold forming portion, at least in a central zone thereof, has a surface roughness Sa in the range of 0.3 μm to 2 μm, and a surface roughness Sz in the range of 10 μm to 50 μm.