Lens Module Asymmetric Abutment Deformation Control
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Solution Overview
Problem
Existing lens modules suffer from severe deformation due to non-collinear forces applied to the lens, leading to reduced stability and imaging quality, with deformation amounts reaching 10 to 15 μm.
Innovation Solution
A lens module design featuring a special-shaped lens with a side surface having a first abutting surface at an included angle with the optical axis, and an inner barrel surface with a second abutting surface parallel to it, where the distance between these surfaces is between 1 μm and 3 μm, limiting further deformation by abutment when exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lens is fixed using a stopper with non-collinear forces applied on both sides, then the lens group is secured in the lens barrel, but the lens experiences severe deformation reaching 10 to 15 μm due to generated torque
Solution Approach 1:
The patent introduces an asymmetric support structure where the first support surface on the object side and the second support surface on the image side are positioned at different locations and orientations. This asymmetric arrangement allows the support forces to be optimally distributed to counteract the torque generated by non-collinear stresses, preventing lens deformation while maintaining secure fixation in the lens barrel.
Solution Approach 2:
The patent adds a new dimensional element by introducing support surfaces that extend beyond the traditional single-plane stopping mechanism. The first support surface and second support surface are arranged in different spatial planes and orientations, creating a three-dimensional support system that effectively counteracts the torque and prevents deformation in multiple directions simultaneously.
2Stability of the object's composition
If the distance between abutting surfaces is reduced to limit deformation, then lens stability improves, but the design complexity and manufacturing precision requirements increase
Solution Approach 1:
The support surfaces serve multiple functions simultaneously: they provide mechanical support to prevent deformation, guide the lens group during assembly, and distribute stress evenly across the lens structure. This multi-functionality reduces the need for additional separate components, thereby limiting overall design complexity while achieving improved stability.
Solution Approach 2:
The patent optimizes specific geometric parameters of the support surfaces, including their angles, distances, and orientations, to achieve the desired balance between stability and complexity. By carefully selecting these parameters, the design achieves effective deformation limitation without requiring overly complex structures or extremely tight manufacturing tolerances.
Data Source
AI summary
A lens module is provided, including a top wall with a light through hole and a barrel wall bent and extending from an edge of the top wall. The lens group includes a special-shaped lens which includes a side surface connecting an object side surface and an image side surface. The side surface includes a first abutting surface connected to the object side surface, and the first abutting surface is arranged at an included angle with an optical axis. The barrel wall includes an inner surface close to the optical axis, and the inner surface includes a second abutting surface arranged opposite to and parallel to the first abutting surface. A distance H between the first abutting surface and the second abutting surface is satisfied: 0 μm<H≤3 μm. A stability of the lens module is improved and an imaging quality of the lens module is ensured.