Glass Optical Element Two-Step Press Molding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for manufacturing optical elements, such as headlight lenses, from inorganic glass face challenges in achieving precise temperature control and mold alignment, leading to inconsistencies in the optical properties and edge formation of the lenses.
Innovation Solution
A method involving a two-step heating and pressing process where a glass blank is first heated with an inner region cooler than the outer region, then pressed between upper and lower molds to form an intermediate molded part, which is subsequently further molded and cooled to create an optical element with precise convex and planar surfaces, including an integrally formed edge with controlled step and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a glass blank is heated uniformly, then the heating process is simple, but the optical properties and edge formation become inconsistent
Solution Approach 1:
The patent applies local quality by creating a temperature gradient within the glass blank during heating, where the inner region is heated to a higher temperature than the outer region. This non-uniform temperature distribution is intentionally designed to achieve consistent optical properties and proper edge formation during the pressing process, resolving the contradiction between manufacturing precision and process simplicity.
2Manufacturing precision
If the glass blank is pressed directly to final shape, then the process is shorter, but the edge formation and surface precision are insufficient
Solution Approach 1:
The patent segments the pressing process into two distinct stages: first forming an intermediate molded part with basic shape, then performing a second pressing operation to achieve the final precise optical surfaces and integrated edge formation. This segmentation allows each stage to be optimized for its specific function, achieving high manufacturing precision while managing the overall process efficiency.
Solution Approach 2:
The first pressing operation serves as a preliminary action that creates an intermediate molded part with approximate geometry. This preliminary shaping prepares the glass for the final pressing operation, allowing the second press to focus on achieving precise optical surfaces and edge details without having to perform all functions in a single operation.
3Temperature
If the molds are aligned perfectly, then the alignment process is simple, but the temperature control during pressing becomes difficult
Solution Approach 1:
The patent employs parameter changes by intentionally creating and controlling a temperature gradient between the inner and outer regions of the glass blank during the pressing process. This temperature parameter variation allows for precise control of the glass viscosity and flow characteristics, enabling accurate edge formation and surface quality while the mold alignment system manages the geometric parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures high precision in forming optical elements with controlled optical properties, including convex and planar surfaces, and an integrally formed edge, enhancing the quality and consistency of headlight lenses.
Implementation Method 1
the blank is heated in a first heating step, for example in such a way that the blank is cooler in the inside than in its outer region
Data Source
AI summary
The disclosure relates to a method for producing an optical element, for example an (optical) lens, for example a headlight lens, for example a vehicle headlight lens, from inorganic glass, wherein a blank of the inorganic glass is heated in a first heating step, for example in such a way that the blank is cooler on the inside than on its outer region, wherein, after heating, the blank is press-molded, for example on both sides, in a first pressing step between an upper mold and a lower mold to form an intermediate molded part, wherein the intermediate molded part is removed from the lower mold after the first pressing step, wherein a surface or the surface of the intermediate molded part formed by the lower mold and/or the surface of the intermediate molded part facing the lower mold is heated in a second heating step after the first pressing step, wherein the intermediate molded part is press-molded, for example on both sides, to the optical element or the (optical) lens, in a second pressing step after the second heating step, and wherein the optical element or the (optical) lens is cooled in a cooling path after the second pressing step.