Five-Element Imaging Lens System for Compact Wide-Field Quality
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view, especially with the advancements in semiconductor technology and increasing functionality requirements of electronic devices.
Innovation Solution
An imaging optical lens system comprising five lens elements with specific refractive powers and surface configurations, including convex and concave surfaces, and a movable lens group for focus adjustment, along with a reflective element to enhance flexibility and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pixel size is scaled down due to semiconductor manufacturing advancements, then device miniaturization is achieved, but image quality becomes difficult to maintain
Solution Approach 1:
The optical system is divided into multiple lens elements (first lens element, second lens element, third lens element, fourth lens element, and fifth lens element) with different refractive powers and surface configurations. This segmentation allows each lens to contribute to correcting specific aberrations while working together to maintain image quality in a miniaturized device.
Solution Approach 2:
The patent specifies precise parameters for each lens element including curvature radii (R2, R3, R6, R7, R8), axial distances (TDL, BLL, T34L), and refractive powers. By optimizing these parameters, the system achieves high image quality despite the reduced pixel size and compact overall dimensions.
2Volume of moving object
If aperture size is reduced for miniaturization, then device size decreases, but light gathering capability and image quality deteriorate
Solution Approach 1:
The patent introduces a movable lens group that can adjust its position along the optical axis to change the focal length. This dynamic adjustment allows the system to optimize light gathering capability at different object distances while maintaining a compact aperture size, thereby improving image quality without increasing device size.
Solution Approach 2:
By varying the axial distance between lens elements (particularly TDL and BLL) through the movable lens group mechanism, the system can adapt the effective aperture and light gathering capability for different imaging conditions while maintaining a small physical aperture diameter.
3Area of stationary object
If field of view is increased for broader coverage, then imaging coverage improves, but optical aberrations and image quality deteriorate
Solution Approach 1:
The optical system uses multiple lens elements with different functions: the first and second lens elements handle wide-angle coverage with positive and negative refractive powers respectively, while the third, fourth, and fifth lens elements correct aberrations. This segmentation enables a wide field of view while maintaining image quality through coordinated aberration correction.
Solution Approach 2:
Different regions of the optical system are optimized for different functions. The first lens element provides wide-angle coverage, while subsequent lens elements provide localized aberration correction. The aspheric surfaces of specific lens elements are designed to correct off-axis aberrations, ensuring high image quality across the entire field of view.
4Adaptability or versatility
If focus adjustment mechanism is added for close-up and telephoto effects, then imaging versatility improves, but device complexity increases
Solution Approach 1:
The movable lens group provides a simple dynamic adjustment mechanism that enables focus switching between close-up and telephoto modes by moving along the optical axis. This single degree of freedom adjustment achieves multiple imaging functions without requiring complex mechanical systems.
Solution Approach 2:
The movable lens group serves multiple functions: it enables focus adjustment, changes the effective focal length for telephoto and close-up effects, and optimizes the optical path for different object distances. This single mechanism provides versatile imaging capability across multiple modes.
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 system achieves a balance between image quality, sensitivity, and miniaturization while maintaining a desirable field of view, facilitating close-up and telephoto effects with simplified mechanism design and improved assembly yield rates.
Implementation Method 1
Each of the five lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side... the first lens element has positive refractive power
Data Source
AI summary
An imaging optical lens system includes five lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The fourth lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.