Six-Lens Optical Assembly for Miniaturized Camera Tolerance Control
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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, such as blurring or deformation, especially when aiming for miniaturization.
Innovation Solution
An optical lens assembly with six lenses, each with specific refractive powers, configured to meet certain conditions that enhance image quality, reduce distortion, and improve manufacturing tolerance, allowing for high-resolution images in both visible and infrared light bands, even at extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera lens device is miniaturized, then the size is reduced, but the manufacturing and assembly sensitivity increases making mass production difficult
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of each lens element to achieve miniaturization while maintaining manufacturability. Specifically, the sixth lens has a positive refractive power with a curvature radius ratio (R7/R6) within a specific range, and the focal length ratios (f6/f, f456/f) are controlled to balance size reduction with assembly tolerance requirements
Solution Approach 2:
The patent uses composite optical design by combining six different lens elements with alternating positive and negative refractive powers. This composite structure allows each lens to contribute differently to the overall optical performance, enabling size reduction while distributing manufacturing tolerances across multiple elements rather than concentrating them in a single element
2Manufacturing precision
If the assembly tolerance is reduced, then the image quality improves, but the manufacturing cost increases
Solution Approach 1:
The patent segments the optical system into six distinct lens elements with specific refractive powers and curvature relationships. This segmentation allows each element to be manufactured and assembled independently with standardized tolerances, avoiding the need for extremely tight tolerances on a single complex element while maintaining high image quality
Solution Approach 2:
The patent changes critical geometric parameters such as the curvature radius ratios (R7/R6 between 0.5 and 2.0), focal length ratios (f6/f between 0.3 and 0.7, f456/f between 0.4 and 0.8), and spacing ratios (T56/CT6 between 0.2 and 0.8) to optimize the balance between assembly tolerance and image quality, reducing manufacturing cost while maintaining performance
3Area of stationary object
If the field of view is increased, then the coverage area improves, but the distortion increases
Solution Approach 1:
The patent divides the optical system into six lens elements with alternating positive and negative refractive powers. This segmentation allows different portions of the optical path to correct different types of aberrations, enabling a wide field of view (60°≤FOV≤120°) while maintaining image shape accuracy through the combined effect of all elements
Solution Approach 2:
The patent employs asymmetric curvature design where the seventh surface (image-side surface of the sixth lens) has a different curvature radius relationship (R7/R6 ratio between 0.5 and 2.0) compared to other surfaces. This asymmetric configuration helps correct distortion across the wide field of view by optimizing the ray paths at different field angles
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 optical lens assembly achieves high image resolution, low distortion, and improved manufacturing yield by optimizing lens configurations, ensuring better image quality and reduced assembly challenges.
Implementation Method 1
a first lens with negative refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power; and a sixth lens with positive 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 negative refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with positive refractive power; a fifth lens with negative refractive power; a sixth lens with positive refractive power; wherein a distance from an object-side surface of the first lens to an image plane along an optical axis is TL, an incident angle of a chief ray on the image plane at a maximum view angle of the optical lens assembly is CRA, a focal length of the optical lens assembly is f, and the following condition is satisfied: 51.73°<TL*CRA/f<129.65°.