Four-Lens Image Capture Assembly with Aspheric Surfaces
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Solution Overview
Problem
Conventional optical systems, such as three-lens and four-lens assemblies, fail to achieve a balance between compact size, wide angle, and high image quality due to limitations in refractive power distribution and lens element thickness, which affects the field angle and image capturing region.
Innovation Solution
An image capturing lens assembly comprising a specific configuration of four lens elements with varying refractive powers and surface curvatures, including aspheric surfaces, optimized by specific axial distances and thickness ratios to minimize size while maintaining high image quality and wide angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional three-lens assembly is used, then the device size is reduced, but the image quality deteriorates
Solution Approach 1:
The optical system is divided into four distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens element to be optimized for specific optical functions, achieving high image quality while maintaining compact size through balanced refractive power distribution.
2Manufacturing precision
If a four-lens assembly is used to improve image quality, then the image quality is improved, but the device size increases
Solution Approach 1:
The patent applies specific parameter constraints including axial distance ratios (T12/T23 between 0.8-1.2), thickness ratios (CT1/CT3 between 0.8-1.2), and refractive power relationships. These parameter optimizations enable the four-lens assembly to achieve high image quality while minimizing the total optical system size through balanced design.
3Volume of moving object
If the refractive power of the first lens element is increased to reduce size, then the device size is reduced, but the field angle is limited
Solution Approach 1:
The optical system employs dynamic balance in refractive power distribution across four lens elements with alternating signs. The first lens element has negative refractive power to expand field angle, while subsequent elements with positive power compensate and focus light, creating a dynamic equilibrium that achieves both wide field angle and compact size.
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 proposed lens assembly achieves a compact, high-performance optical system with improved image quality and wide angle capabilities by optimizing the refractive power distribution and surface curvatures of the lens elements, addressing the limitations of conventional systems.
Implementation Method 1
The fourth lens element with positive refractive power has an object-side surface convex at a paraxial region and an image-side surface concave at a paraxial region, with at least one of the object-side and image-side surfaces being aspheric
Data Source
AI summary
An image capturing lens assembly includes, in order from an object-side to an image-side along an optical axis, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element with negative refractive power has an image-side surface being concave at a paraxial region. The second lens element with positive refractive power has an image-side surface being convex at a paraxial region. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being convex at a paraxial region. The fourth lens element with positive refractive power has an object-side surface being convex at a paraxial region, and an image-side surface being concave at a paraxial region, and at least one of the object-side surface and the image-side surface is aspheric.