Plastic Lens Peripheral Structure for Easier Demolding
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Solution Overview
Problem
The challenge in the development of plastic lens elements for portable electronic devices is enhancing the molding yield and enhancing the molding yield of the plastic lens elements, and the molding yield is not sufficient in existing technologies.
Innovation Solution
The plastic lens element design includes a peripheral region with a protrusive structure, indented shape, and drafting part, featuring a conical surface that provides demolding resistance, and a release notch with an air gap to enhance molding yield and prevent deformation during demolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer diameter of the plastic lens element is increased for better imaging performance, then the imaging quality is improved, but the demolding resistance increases making production more difficult
Solution Approach 1:
The patent incorporates a drafting part with a conical surface into the lens element design before molding. This conical surface is formed during the injection molding process itself, creating a built-in demolding feature that facilitates easy removal of the lens from the mold without requiring additional post-processing steps or increasing demolding resistance.
2Productivity
If the lens element structure is simplified for easier manufacturing, then the production efficiency is improved, but the assembling tolerance increases reducing precision
Solution Approach 1:
The patent divides the lens element into distinct functional regions: an optical effective region for imaging and a peripheral region containing the drafting part with conical surface. This segmentation allows the peripheral region to provide demolding functionality while the optical region maintains precision, enabling both easy manufacturing and high assembling tolerance through separate optimized zones.
3Ease of manufacture
If the peripheral region is designed with additional structures for demolding, then the demolding resistance is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the demolding function with the peripheral region structure of the lens element. The drafting part with conical surface is integrated into the peripheral region rather than being added as a separate component. This combination achieves effective demolding while avoiding additional device complexity, as the demolding feature becomes an inherent part of the lens element's peripheral structure.
Data Source
AI summary
A plastic lens element includes an optical effective region and a peripheral region. The peripheral region is circularly disposed on a periphery of the optical effective region, and the peripheral region includes a protrusive structure, an indented shape and a drafting part. The protrusive structure is disposed on an outer diameter surface and adjacent to an annular lateral surface. The indented shape is dented from the outer diameter surface towards the optical effective region. The drafting part is raised from a base surface towards the direction away from an optical axis, and the drafting part has a top surface and a bottom surface via the section, wherein the top surface and the bottom surface are arranged along an extending direction parallel to the optical axis, and a conical surface is located between the top surface and the bottom surface.