Five-Element Wide-Angle Lens for Compact High-Resolution Imaging
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Solution Overview
Problem
Conventional wide-angle lenses have a large size and aperture, making them unsuitable for lightweight and thin electronic devices, and they struggle to meet the imaging quality demands due to smaller pixel sizes and higher resolution requirements.
Innovation Solution
A wide-angle lens design comprising five lenses with specific focal powers and surface shapes, including a glass lens, an optical stop, and an infrared filter, optimized to reduce size while maintaining high imaging quality and resolution, using relationships such as sd1/ImgH < 0.36 to control the aperture and lens diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional wide-angle lens design is used to achieve a large field of view, then the viewing angle is improved, but the lens size and weight increase
Solution Approach 1:
The lens system is divided into five separate lens elements with different focal powers (negative, positive, positive, positive, negative) arranged in sequence. Each lens element is optimized for specific optical functions, allowing the system to achieve a wide field of view while maintaining a compact overall structure through segmented optical design.
Solution Approach 2:
The patent applies specific parameter relationships including sd1/ImgH < 0.36, where sd1 represents the maximum effective half-aperture of the first lens and ImgH is half the diagonal length of the effective pixel area. This parameter constraint enables optimization of the aperture and lens diameter to achieve a compact size while maintaining the required field of view.
2Measurement precision
If the pixel size on the CMOS chip is reduced to increase resolution, then the imaging quality is improved, but the requirements for lens precision and quality increase
Solution Approach 1:
The five-lens system segments the optical path to correct various aberrations that would otherwise be magnified by smaller pixel sizes. Each lens element is designed to address specific optical challenges, enabling high imaging quality on small pixels without requiring excessive manufacturing precision.
Solution Approach 2:
The lens system uses composite optical design combining different lens materials and configurations (including at least one glass lens among the five elements) to achieve superior optical performance. This composite approach allows correction of aberrations that would be difficult to manage with single-lens or simple multi-element designs.
3Measurement precision
If the lens aperture is increased to improve light gathering ability, then the imaging quality is improved, but the lens size increases
Solution Approach 1:
The patent optimizes the aperture parameter through the relationship sd1/ImgH < 0.36, where sd1 is the maximum effective half-aperture. This parameter constraint allows the lens system to achieve adequate light gathering ability for high imaging quality while maintaining a compact aperture size that does not increase the overall lens volume.
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 design achieves a compact lens with a large field of view, improved imaging quality, and reduced environmental sensitivity, suitable for lightweight electronic devices like mobile phones and tablets.
Implementation Method 1
a first lens with a negative focal power, an image side surface of the first lens is concave at the optical axis; a second lens with a positive focal power, an object side surface of the second lens is convex at the optical axis, and an image side surface of the second lens is convex at the optical axis
Data Source
AI summary
A wide-angle lens, an image capturing device and an electronic device. The wide-angle lens includes in sequence from an object side to an image side along an optical axis: a first lens with a negative focal power, an image side surface of the first lens is concave at the optical axis; a second lens with a positive focal power, an object side surface of the second lens is convex at the optical axis, and an image side surface of the second lens is convex at the optical axis; a third lens with a focal power; a fourth lens with a positive focal power, an image side surface of the fourth lens is convex at the optical axis; a fifth lens with a negative focal power, an object side surface of the fifth lens is convex at the optical axis, an image side surface of the fifth lens is concave at the optical axis, and at least one of the object side surface and the image side surface of the fifth lens includes at least one inflection point; and an optical stop disposed between the first lens and the second lens; one of the first lens to the fifth lens is a glass lens.