Cemented Imaging Lens Layout for Assembly Tolerance Control
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Solution Overview
Problem
The assembly tolerance between lens elements in imaging lenses poses a challenge, particularly in lenses with multiple elements, affecting production yield and imaging quality.
Innovation Solution
The implementation of a cemented lens element, specifically formed by the third and fourth lens elements, reduces assembly tolerance by integrating these elements, ensuring good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If multiple separate lens elements are used to meet design requirements, then the imaging lens can achieve larger aperture and shorter system length, but the assembly tolerance between lens elements increases and production yield decreases
Solution Approach 1:
The patent combines the third and fourth lens elements into a single cemented lens element, reducing the number of separate components. This merging eliminates the air gap between these elements and removes the need for precise alignment and spacing control, thereby reducing assembly tolerance issues while maintaining the compact system length
2Measurement precision
If multiple separate lens elements are used to achieve higher pixels and resolutions, then the imaging quality can be improved, but the assembly tolerance between lens elements increases affecting production yield
Solution Approach 1:
By cementing the third and fourth lens elements together, the patent reduces the number of interfaces and alignment requirements, thereby improving production yield. The cemented structure maintains the optical performance needed for high imaging quality while eliminating tolerance accumulation that would occur with separate elements
3Adaptability or versatility
If multiple separate lens elements are used to meet design requirements, then the optical performance can be optimized, but the device complexity increases
Solution Approach 1:
The patent merges the third and fourth lens elements into a single cemented unit, reducing the total number of discrete lens elements from seven to six. This simplification reduces device complexity while the cemented design maintains the optical functionality and adaptability required to meet various design specifications
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 cemented lens element design enhances production yield and maintains high imaging quality with reduced assembly tolerance, achieving optimal performance across various design requirements.
Implementation Method 1
The third lens element and the fourth lens element form a cemented lens element
Data Source
AI summary
An imaging lens, sequentially including a first lens element to a seventh lens element from an object side to an image side along an optical axis, is provided. The first lens element has positive refracting power. The second lens element has negative refracting power. The third lens element and the fourth lens element form a cemented lens element, and the cemented lens element has positive refracting power. The fifth lens element has positive refracting power. The sixth lens element has positive refracting power. The seventh lens element has negative refracting power.