Wafer-Level Embedded Aperture Stop in Optical Lens Module
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Solution Overview
Problem
Conventional optical lens modules in portable cell phones face challenges in minimizing the optical length to composite focal distance ratio and achieving robust connection and accurate positioning of individual aperture stops and lenses due to their compact design.
Innovation Solution
An optical lens module design that embeds an aperture stop within the first lens using wafer level processing, comprising sequentially arranged lenses with specific surface configurations and materials, ensuring secure and accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional aperture stop and lenses are assembled as individual parts, then the optical lens module can be manufactured with standard assembly processes, but the connection robustness and positioning accuracy deteriorate
Solution Approach 1:
The aperture stop is integrated into the first lens as a single monolithic structure through wafer level processing, eliminating the separate assembly of aperture stop and lens. This merging ensures robust connection and accurate positioning while maintaining ease of manufacture through standardized wafer processing techniques
2Ease of manufacture
If conventional aperture stop and lenses are assembled as individual parts, then the assembly process can be simplified, but the positioning accuracy deteriorates
Solution Approach 1:
The aperture stop and first lens are formed as a single integrated component through wafer level processing, eliminating positioning errors associated with separate assembly. The monolithic structure ensures precise positioning while the standardized processing maintains manufacturing simplicity
3Volume of moving object
If the optical lens module is designed for compact portable devices, then the device size is reduced, but the optical length to focal distance ratio becomes difficult to minimize
Solution Approach 1:
The integrated aperture stop and lens structure enables more efficient optical path design within compact dimensions. By eliminating the gap and alignment requirements between separate components, the optical length is reduced while maintaining imaging performance, thus minimizing the optical length to focal distance ratio in compact devices
Data Source
AI summary
An optical lens module is provided, including a first lens, a second lens, a third lens, and an aperture stop formed in the first lens by wafer level processing. The first lens, the second lens, and the third lens are sequentially arranged from an object side to an image side along an optical axis of the optical lens module. The first lens has a convex surface and a concave surface, respectively, on an object side and an image side. The second lens has a concave surface and a convex surface, respectively, on the object side and the image side. The third lens has a convex peripheral portion on the image side, wherein the convex peripheral portion forms a surface with a concave center on the image side, and the surface has an inflection point.