Optical Lens Assembly Compact Design Aberration Correction
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Solution Overview
Problem
The challenge is to design an optical lens assembly that maintains good imaging quality while minimizing its length, which is essential for portable electronic devices, and also addresses production difficulties such as assembling yield and material properties.
Innovation Solution
The optical lens assembly consists of a sequence of lens elements with specific refracting powers and surface shapes, including convex and concave portions, which are arranged to optimize imaging performance and correct aberrations, ensuring that the ratio of total lens length to effective focal length is within specific limits to achieve a compact and efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical lens assembly is scaled down to reduce length, then the total length is reduced, but the imaging quality deteriorates
Solution Approach 1:
Each lens element is designed with specific local surface characteristics (convex or concave portions in specific regions) to optimize light ray control at different positions, enabling compact design while maintaining imaging quality through localized functional optimization
Solution Approach 2:
The patent applies specific parameter relationships (such as (TTL×F/#)/EFL≤2.2 and 1.1≤EFL/TTL≤1.3) to control the optical system's performance, allowing miniaturization while preserving imaging quality through mathematical optimization of key parameters
2Length of moving object
If the optical lens assembly is scaled down to reduce length, then the total length is reduced, but the aperture size decreases
Solution Approach 1:
The patent optimizes the F/# parameter and its relationship with TTL and EFL to maintain adequate aperture size in a compact system, achieving (TTL×F/#)/EFL≤2.2 which balances aperture availability with miniaturization
3Length of moving object
If the optical lens assembly is scaled down to reduce length, then the total length is reduced, but the field of view narrows
Solution Approach 1:
The lens elements are designed with specific surface shapes (convex portions near optical axis, concave portions near periphery) to control light rays at different field positions, enabling expanded field of view in a compact configuration through localized ray control
4Ease of manufacture
If conventional lens design methods are used, then manufacturing is simpler, but assembly yield decreases
Solution Approach 1:
The optical system is divided into multiple discrete lens elements with specific functions, allowing independent manufacturing and quality control of each element while ensuring proper assembly through defined spacing and positioning requirements
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 achieves good optical performance with reduced lens length, improving image quality and assembly yield by effectively correcting aberrations and increasing aperture availability without increasing the total length of the lens assembly.
Implementation Method 1
each of the first lens element to the fourth lens element includes an object-side surface that faces the object side and allows imaging rays to pass through as well as an image-side surface that faces the image side and allows the imaging rays to pass through
Data Source
AI summary
An optical lens assembly includes first, second, third and fourth lens elements arranged in sequence from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power, and the image-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of the periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of the periphery.