Five-Lens Optical Assembly for Low-Sensitivity Camera Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Small camera lens devices face challenges in manufacturing and assembly due to sensitivity issues, leading to increased costs and compromised image quality, particularly in miniaturized designs.
Innovation Solution
An optical lens assembly with five lenses, each with specific refractive powers and configurations, including aspheric surfaces, that satisfy certain conditions to achieve a wide field of view, high resolution, low distortion, and low manufacturing tolerance, while allowing for glass materials to withstand extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens device is miniaturized to reduce size, then the device becomes more compact and suitable for portable electronics, but manufacturing sensitivity increases and assembly tolerance requirements become stricter
Solution Approach 1:
The optical lens assembly is divided into five separate lens elements with different refractive powers arranged in sequence. This segmentation allows each lens to be manufactured and assembled independently, distributing the tolerance requirements across multiple components rather than requiring ultra-precise single-component manufacturing, thus enabling miniaturization while managing assembly sensitivity.
Solution Approach 2:
The patent specifies particular parameter ranges for lens thickness, radius of curvature, and refractive power to optimize the balance between compact size and manufacturing feasibility. By carefully controlling these parameters, the design achieves small form factor while maintaining reasonable assembly tolerance requirements.
2Manufacturing precision
If assembly tolerance is reduced to improve image quality, then image clarity improves, but manufacturing complexity and cost increase
Solution Approach 1:
Different lens elements are assigned different refractive powers (positive and negative) and specific thickness profiles to correct optical aberrations locally. This allows image quality improvement through targeted optical design rather than requiring uniform ultra-precise manufacturing across all components, reducing overall manufacturing complexity.
Solution Approach 2:
The patent employs aspheric surfaces on lens elements to correct optical distortions and improve image quality. Aspheric designs can achieve superior optical performance with relaxed manufacturing tolerances compared to traditional spherical lenses, thereby improving image quality without proportionally increasing manufacturing complexity.
3Manufacturing precision
If more lenses are added to improve image quality and reduce distortion, then resolution and field of view improve, but device size and manufacturing complexity increase
Solution Approach 1:
Multiple lens elements with different functions (positive refractive power for focusing, negative refractive power for aberration correction) are combined in a single integrated optical assembly. This merging achieves high image quality and low distortion while maintaining a compact form factor, avoiding the need for separate optical modules.
Solution Approach 2:
Each lens element serves multiple optical functions simultaneously - for example, the second lens with negative refractive power both diverges light to expand field of view and corrects spherical aberration. This multi-functionality reduces the total number of lenses needed while maintaining high image quality.
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 solution enables improved product quality, yield, and reduced assembly sensitivity, while maintaining image clarity and flexibility in lens material selection.
Implementation Method 1
an optical lens assembly in accordance with an embodiment of the present invention includes, in order from an object side to an image side: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; and a fifth lens with negative refractive power
Data Source
AI summary
An optical lens assembly includes, in order from an object side to an image side: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power; wherein the optical lens assembly has a total of five lenses with refractive power, a distance from an image-side surface of the fifth lens to an image plane along an optical axis is BFL, a thickness of the second lens along the optical axis is CT2, a thickness of the third lens along the optical axis is CT3, an incident angle of a chief ray on 80% of the maximum image height of the optical lens assembly is CRA8, and the following condition is satisfied: 51.97°<CRA8*BFL/(CT2+CT3)<97.45°.