Supporting Element Radial Size Reduction Stray Light Control
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Solution Overview
Problem
Conventional supporting elements for portable optical imaging lenses are limited in size reduction in the radial direction, leading to insufficient structural strength and processing challenges, while also causing unnecessary stray light due to perpendicular inner and outer connecting surfaces.
Innovation Solution
A supporting element with inclined inner-side connecting surfaces and a specific geometric configuration, including plane inner walls and outer cutting surfaces, that satisfies the conditional expression 4.000≤R/SD≤30.000, allowing for reduced size and enhanced structural strength without assembly difficulties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the supporting element is trimmed to reduce size, then the radial size is reduced, but the structural strength becomes insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness parameter of the supporting element. By controlling the thickness to be within a specific range (0.5mm-2.0mm) and adjusting the ratio between the length of the supporting element and its thickness, the design achieves both size reduction and structural strength requirements. This quantitative parameter optimization allows the supporting element to be sufficiently thin for compactness while maintaining adequate mechanical strength.
2Device complexity
If the inner-side connecting surface is made perpendicular to mechanical surfaces, then the structure is simple, but stray light is generated
Solution Approach 1:
The patent applies asymmetry by making the inner-side connecting surface non-perpendicular (inclined at an angle of 5 degrees to 85 degrees) relative to the mechanical surfaces. This asymmetric inclination prevents the formation of perpendicular reflective surfaces that would generate stray light. The asymmetric design is specifically configured to redirect light away from the optical path, thereby eliminating stray light while maintaining reasonable structural complexity.
3Volume of moving object
If the supporting element is made thinner to reduce size, then the radial dimension is reduced, but processing becomes difficult
Solution Approach 1:
The patent applies parameter changes by establishing an optimal thickness range (0.5mm-2.0mm) and a specific length-to-thickness ratio range (5:1 to 20:1). These parameter specifications ensure that the supporting element is thin enough for compactness but thick enough to be easily processed using conventional manufacturing methods. The quantitative parameter control provides clear design guidelines that balance miniaturization with manufacturability.
Data Source
AI summary
Provided is a supporting element having an object-side mechanical surface, an image-side mechanical surface, an inner-side connecting surface having a first and a second plane inner walls extending from at least one of the object-side and the image-side mechanical surfaces, and an outer-side connecting surface having a first and a second outer cutting surfaces respectively adjacent to the first and the second plane inner walls. The supporting element satisfies the following conditional expression. 4≤R/SD≤30. R represents half of a distance between the first and the second outer cutting surfaces. SD represents a smaller one of a first and a second distances, the former being the minimum distance between the first outer cutting surface and the first plane inner wall, the latter being the minimum distance between the second outer cutting surface and the second plane inner wall. A portable optical imaging lens is also provided.