Seven-Lens Optical Imaging Assembly for Wide-Angle Compact Camera Modules
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Solution Overview
Problem
Conventional camera modules in portable electronic devices face limitations in achieving a wide angle and large image surface with a small form factor, due to constraints in relative illumination and image information collection.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers, surface types, and thickness configurations, including aspheric surfaces, to achieve a maximum field of view of 100° to 120° and a large image surface, while maintaining a compact size and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-lens mode combining ultrathin and large-image-surface lens, wide-angle lens and telephoto lens is adopted, then imaging performance is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple lens functions (wide-angle and large-image-surface) into a single optical imaging lens assembly, eliminating the need for separate ultrathin lens and wide-angle lens. This merging approach maintains comprehensive imaging performance while reducing the number of components and overall device complexity.
Solution Approach 2:
The optical imaging lens assembly is designed to perform multiple functions simultaneously - achieving both wide-angle imaging and large-image-surface coverage with a single integrated structure. This multi-functionality allows the system to replace multiple specialized lenses, simplifying the overall device architecture.
2Area of moving object
If a wide-angle lens with relatively large field of view is used, then field of view is improved, but imaging surface size is limited due to relative illumination constraints
Solution Approach 1:
The patent employs aspheric surfaces with specifically optimized curvature parameters and conic coefficients to change the optical path parameters. This allows light rays from wide angles to be properly focused across a large imaging surface, overcoming the traditional relative illumination limitations that constrain wide-angle lens design.
Solution Approach 2:
The use of aspheric surfaces instead of simple spherical surfaces enables better control over light ray paths. The varying curvature of the aspheric surfaces allows for optimized illumination distribution across the imaging surface, enabling both large field of view and large imaging surface to coexist.
3Manufacturing precision
If the number of lenses is increased to achieve wide angle and large image surface, then imaging quality is improved, but total track length increases
Solution Approach 1:
The patent divides the optical system into seven distinct lens elements with specific refractive powers and surface configurations. This segmentation allows each lens to contribute specifically to correcting aberrations and achieving wide-angle performance, maintaining high imaging quality while controlling the overall track length through optimized individual element designs.
Solution Approach 2:
By carefully controlling parameters such as refractive index, Abbe number, surface curvature, and thickness of each lens element, the patent achieves compact design. The specific parameter ranges specified for each lens enable the system to maintain high imaging quality with a reduced total track length compared to conventional multi-lens systems.
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 a portable electronic device camera module to capture a wide angle and large image surface effectively, improving image quality and aperture, while being compact and manufacturable, thus overcoming the limitations of conventional designs.
Implementation Method 1
an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the fifth lens has a negative refractive power; an object-side surface of the sixth lens is a concave surface, and an image-side surface of the sixth lens is a convex surface; a maximum field of view FOV of the optical imaging lens assembly satisfies 100°<FOV<120°; ImgH is a half the diagonal length of an effective pixel region on an imaging surface of the optical imaging lens assembly, and ImgH satisfies ImgH>4.5 mm; and a total effective focal length f of the optical imaging lens assembly and an Entrance Pupil Diameter (EPD) of the optical imaging lens assembly satisfy f/EPD<2.