Micro-lens Module with Aspheric Groups and Integrated Stops
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Solution Overview
Problem
Current micro-lens modules struggle to provide high imaging quality and miniaturized size suitable for applications with more than one million pixels, with existing designs often compromising on either quality or size.
Innovation Solution
A micro-lens module design comprising a first and second lens group with aspheric surfaces, integrated aperture stops, and infrared filters, along with matte surfaces on lens carry portions to reduce stray light, while adhering to specific focal length and curvature conditions to optimize imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex optical elements are used to improve imaging quality for more than one million pixels application, then imaging quality is improved, but device size increases
Solution Approach 1:
The patent combines multiple optical elements (aperture stop, infrared filter, and lens structures) into integrated units. Specifically, the aperture stop and infrared filter are merged with the lens groups to form compact assemblies, reducing the overall module size while maintaining the complex optical functionality needed for high-pixel imaging quality
Solution Approach 2:
The patent employs a nested structure where the aperture stop is positioned within the first lens group, and the infrared filter is integrated within the lens assembly. This nesting approach allows multiple optical components to occupy overlapping or adjacent spaces, minimizing the overall volume while preserving imaging quality for multi-million pixel applications
2Manufacturing precision
If multiple independent optical components are used to eliminate stray light, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the stray light elimination function into the existing lens groups by integrating aperture stops and infrared filters directly within the lens assemblies. This eliminates the need for separate, independent stray light control components, reducing structural complexity while maintaining imaging quality
Solution Approach 2:
The lens groups are designed to serve multiple functions: primary image formation, stray light control through integrated aperture stops, and infrared filtration. This multi-functionality reduces the total number of components needed, simplifying the overall structure while achieving high imaging quality
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
The design achieves good imaging quality and miniaturization, effectively addressing the challenge of high pixel applications by ensuring optimal focal lengths, surface distances, and reflective index conditions, while minimizing stray light through the use of matte surfaces.
Implementation Method 1
The first lens group disposed between an object side and an image side has a first aspheric surface which is the surface closest to the object side and a second aspheric surface which is the surface closest to the image side
Implementation Method 2
matte surfaces on lens carry portions to reduce stray light
Data Source
AI summary
A micro-lens module including a first lens group and a second lens group is provided. The first lens group disposed between an object side and an image side has a first aspheric surface which is the surface closest to the object side and a second aspheric surface which is the surface closest to the image side. The second lens group disposed between the first lens group and the image side has a third aspheric surface which is the surface closest to the first lens group and a fourth aspheric surface which is the surface closest to the image side. An overall length of the micro-lens module is L, an effective focal length (EFL) of the micro-lens module is f, and an EFL of the second lens group is f2. The micro-lens module satisfies following conditions: 1.5>L/f>0.6, and −7>f2/f>−14.