Lens Unit with Flat and Inclined Reception Surfaces for Thermal Stability
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Solution Overview
Problem
Existing lens units experience changes in the shapes and positions of multiple lenses due to temperature variations, leading to performance issues such as aberrations and decentering.
Innovation Solution
A lens unit design with multiple lenses arranged along an optical axis, featuring a first lens group with flat-reception lenses and a second lens group with inclination-reception lenses, supported by an elastic member and pressed by a pressing member, adhering to the expression K×(t×(∑i=1n(αi×Li)-α0×L0)/F < 0.1 to stabilize the lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple lenses are arranged in a lens barrel with elastic members and pressing members, then the lenses can be supported and pressed to maintain positioning, but changes in temperature cause expansion and contraction that lead to changes in lens shapes and positions
Solution Approach 1:
The patent applies parameter changes by carefully selecting the elastic modulus K of the elastic member and the pressing force F to satisfy the inequality K×(t×(∑i=1n(αi×Li)-α0×L0)/F < 0.1. This mathematical relationship adjusts the physical parameters of the elastic member and pressing force to compensate for thermal expansion effects, maintaining lens position stability across temperature variations.
Solution Approach 2:
The patent directly addresses thermal expansion by incorporating the coefficients of linear expansion (αi for lenses, α0 for lens barrel) into the design inequality. The elastic member and pressing member are designed to accommodate the differential thermal expansion between lenses and the lens barrel, preventing unwanted position changes while allowing controlled expansion.
2Strength
If an elastic member with high elastic modulus is used to firmly press the lenses, then the lenses are securely positioned, but the pressing force may cause deformation of the lenses under temperature variations
Solution Approach 1:
The patent uses parameter changes by establishing a specific relationship between the elastic modulus K and pressing force F through the inequality K×(t×(∑i=1n(αi×Li)-α0×L0)/F < 0.1. This ensures the pressing force is sufficient to maintain lens positioning but not so strong as to cause deformation, with the optimal values adjusting based on temperature range and material properties.
Solution Approach 2:
The patent employs composite materials by selecting an elastic member made of metal (such as stainless steel or aluminum alloy) with specific elastic modulus properties. This metal elastic member provides the necessary strength while maintaining appropriate elasticity to prevent lens deformation under pressing force.
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 reduces changes in lens shapes and positions, maintaining consistent performance by absorbing asymmetric pressing forces and minimizing decentering, even with temperature fluctuations.
Implementation Method 1
an elastic member between the first lens group and the second lens group, the elastic member configured to support at least one of the multiple lenses in the lens barrel
Implementation Method 2
an expression (1) below is satisfied: K×(t×(∑i=1n(αi×Li)-α0×L0)/F < 0.1 where: K is an elastic modulus of the elastic member, F is an elasticity force to press the multiple lenses by elasticity of the elastic member
Implementation Method 3
a pressing member configured to press the multiple lenses in the lens barrel
Implementation Method 4
a lens barrel housing the multiple lenses inside the lens barrel
Data Source
AI summary
A lens unit includes: multiple lenses arranged in an axial direction along an optical axis, the multiple lenses including: a first lens group including a flat-reception lens having a flat surface perpendicular to the axial direction to be pressed; and a second lens group including an inclination-reception lens having an inclination surface inclined relative to the axial direction to be pressed, a lens barrel housing the multiple lenses inside the lens barrel; and an elastic member between the first lens group and the second lens group, the elastic member to support at least one of the multiple lenses in the lens barrel; and a pressing member to press the multiple lenses in the lens barrel.