Imaging Lens Assembly With Frustum Surfaces for Thermal Alignment
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Solution Overview
Problem
Imaging lens assemblies in portable electronic devices face challenges in maintaining the relative position between lens elements due to variations in temperature and humidity, leading to optical dispersion and reduced imaging quality.
Innovation Solution
The imaging lens assembly design includes specific frustum surfaces and receiving surfaces on lens elements that maintain alignment and spacing under varying environmental conditions, using annular corresponding structures to ensure stable contact and separation based on temperature changes, with controlled thermal expansion coefficients and angles to minimize offset risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lens elements with different refractive indexes are used to reduce optical dispersion, then imaging quality is improved, but the lens elements expand or contract differently under temperature or humidity changes, causing relative displacement and reducing imaging quality
Solution Approach 1:
The patent applies the thermal expansion principle by designing the lens holder with a specific thermal expansion coefficient that matches or compensates for the combined thermal expansion of the lens elements. The holder includes expansion compensation structures that allow controlled dimensional changes with temperature, preventing differential expansion between lens elements with different refractive indexes, thereby maintaining their relative positions and optical alignment under varying temperature conditions.
2Stability of the object's composition
If lens elements are fixed tightly to maintain alignment, then relative position stability is improved, but the structure becomes more complex and harder to manufacture
Solution Approach 1:
The patent merges the functions of holding, aligning, and thermally compensating for lens elements into a single integrated lens holder structure. The holder combines mechanical support features with expansion compensation mechanisms, eliminating the need for separate alignment and fixation components. This unified design maintains stable relative positions between lens elements while simplifying the overall structure and reducing manufacturing complexity.
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
This design enhances the resistance of the imaging lens assembly to environmental factors, reducing the risk of lens offset and maintaining imaging quality by ensuring consistent alignment and spacing between lens elements despite temperature and humidity variations.
Implementation Method 1
when the temperature or the humidity is changed, or when the imaging lens assemblies are disposed under the high temperature and the high humidity for the long time, the lens elements are easily expanded or contracted owing to the variation of the temperature
Data Source
AI summary
An imaging lens assembly includes, in order from an object side to an image side, a first lens element and a second lens element. The first lens element includes a first frustum surface and a second frustum surface. The first frustum surface is disposed on a side of the first lens element facing towards the second lens element. The first frustum surface and the second frustum surface are disposed on the same side and coaxial, and the second frustum surface is closer to an optical axis than the first frustum surface to the optical axis. The second lens element includes a first corresponding frustum surface and a second corresponding frustum surface. The first corresponding frustum surface is corresponding to the first frustum surface. The second corresponding frustum surface is corresponding to the second frustum surface.