Five-Element Aspherical Lens for Compact Camera Module
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Solution Overview
Problem
The challenge is to develop a camera lens that balances miniaturization with increasing image quality demands, as larger chip sizes necessitate larger lens volumes, hindering further miniaturization while maintaining image quality.
Innovation Solution
The optical lens design includes a sequence of aspherical lenses with specific focal powers and a stop placement to reduce sensitivity and aberrations, allowing for a compact structure that maintains high image quality, comprising a first positive lens, a second negative lens, a third negative lens, a fourth negative lens, a fifth positive lens, and a filter, with the stop between the second and third lenses, and the filter between the fifth lens and the imaging plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the chip size is increased to improve image quality, then the lens volume must be increased accordingly, but this makes miniaturization difficult
Solution Approach 1:
The lens system is divided into five separate aspherical lenses with different focal powers (positive, negative, negative, negative, positive) arranged in sequence. Each lens element is optimized independently to contribute specific aberration correction functions, allowing the overall system to achieve high image quality while maintaining a compact total volume through efficient spatial utilization of each segment.
Solution Approach 2:
The patent employs aspherical surfaces instead of traditional spherical surfaces for all five lens elements. By precisely controlling the aspherical coefficients and focal lengths of each lens, the system corrects various optical aberrations (field curvature, distortion, chromatic aberration) more effectively. This parameter optimization enables high image quality with reduced lens volume compared to conventional spherical lens designs.
2Manufacturing precision
If more lens elements are added to correct aberrations, then image quality improves, but device complexity increases
Solution Approach 1:
The patent combines multiple aberration correction functions into a single integrated five-element aspherical lens system. Rather than using separate correction lenses for different aberrations, the design merges field curvature correction, distortion correction, and chromatic aberration correction into the coordinated action of five aspherical elements, reducing overall structural complexity while maintaining comprehensive aberration correction.
Solution Approach 2:
All five lens elements utilize aspherical surfaces with specific curvatures optimized for aberration correction. The aspherical shape allows each lens to simultaneously control multiple optical parameters (focal length, aberration correction, light angle control), reducing the need for additional specialized correction elements and simplifying the overall lens structure.
3Volume of moving object
If the lens is designed for miniaturization, then volume decreases, but image quality may deteriorate
Solution Approach 1:
The patent utilizes the aspherical dimension (the fourth parameter in lens surface geometry) to achieve compact lens design. By optimizing the aspherical coefficients of each lens element, the system corrects optical aberrations that would otherwise require increased lens diameter or length, enabling miniaturization while maintaining high image quality through sophisticated surface geometry rather than simply scaling down conventional designs.
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
This design achieves a compact, high-performance optical lens with reduced volume and weight, effectively correcting field curvature, distortion, and chromatic aberrations, suitable for portable electronic devices, while enhancing user experience through improved image quality and miniaturization.
Implementation Method 1
The optical lens sequentially includes a first lens with a positive focal power, a second lens with a negative focal power, a third lens with a negative focal power, a fourth lens with a negative focal power, a fifth lens with a positive focal power
Data Source
AI summary
Disclosed are an optical lens, a camera module and a camera. From an object side to an image side along an optical axis, the optical lens includes: a first lens having a positive focal power and a convex object side surface; a second lens having a negative focal power; a third lens having a negative focal power; a fourth lens having a negative focal power; a fifth lens having a positive focal power, an object side surface of the fifth lens is convex at a paraxial region thereof, and an image side surface of the fifth lens is concave at a paraxial region thereof; a stop disposed between the second and third lens; and a filter disposed between the fifth lens and an imaging plane. The camera module includes the optical lens and an image sensor, and the camera includes the camera module.