Six-Lens Optical Imaging Group for Ultra-Short Mobile Phone Systems
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Solution Overview
Problem
The challenge is to design an optical imaging lens group for full-screen mobile phones that maintains a large image area and ultra-short total system length without degrading image quality, while facing increasing design difficulty due to the reduction in image sensor size and performance improvements.
Innovation Solution
The optical imaging lens group consists of six lenses, with specific refractive powers, surface shapes, and center thicknesses, arranged along the optical axis to achieve a compact and high-quality imaging system. Each lens has a unique configuration, including convex and concave surfaces, and aspheric surfaces to optimize refractive power distribution and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the total system length is reduced to achieve ultra-short design, then the compactness is improved, but the image area may be reduced
Solution Approach 1:
The optical imaging lens group is divided into six individual lenses with different refractive powers and surface configurations. Each lens segment performs specific optical functions (positive/negative refractive power distribution), allowing the system to achieve compact total length while maintaining sufficient image area through optimized segmentation of optical tasks across multiple elements.
Solution Approach 2:
The six lenses are arranged in a nested sequence along the optical axis with controlled air gaps between them. The lens elements are positioned closely together with minimal spacing (e.g., T12, T23, T34, T45, T56 parameters), creating a compact nested structure that reduces total system length while preserving the necessary optical path for maintaining image area.
2Reliability
If the number of lenses is increased to improve image quality, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
Each of the six lenses is designed with specific local optical properties including different refractive powers (positive or negative), distinct surface curvature configurations (convex/concave combinations), and varied center thicknesses. This local differentiation allows each lens element to address specific aberrations or optical requirements, achieving high overall imaging quality through specialized local optimizations rather than uniform design.
Solution Approach 2:
The patent employs systematic variation of key parameters across the six lenses including refractive power signs, surface curvature radii (R1-R12), center thicknesses (CT1-CT6), and air gap distances (T12-T56). These parameter changes enable precise control over optical performance, allowing the complex six-lens system to achieve superior imaging quality by tuning multiple parameters rather than relying on simple uniform lens designs.
3Length of stationary object
If the center thickness of lenses is reduced to achieve thinner profile, then the overall thickness is improved, but the refractive power may be insufficient
Solution Approach 1:
The lens design employs asymmetric surface configurations where object-side and image-side surfaces have different curvature characteristics. For example, the first lens has a convex object-side surface and concave image-side surface, while the sixth lens has a concave object-side surface. This asymmetric design allows optimized light control with reduced center thickness by directing optical power through surface curvature rather than relying solely on thickness.
Solution Approach 2:
The patent utilizes highly curved aspheric surfaces on multiple lenses to achieve the necessary refractive power with reduced center thickness. The surface curvature radii (R1-R12) are optimized to provide strong optical power in thin lens elements, allowing the system to maintain adequate refractive capability while achieving ultra-thin profile through enhanced surface curvature rather than increased thickness.
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 configuration results in an ultra-thin, large imaging plane with excellent imaging quality, meeting the requirements of miniaturization and high image fidelity while maintaining a small size and low aberrations.
Implementation Method 1
each of the first through the sixth lenses has refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens group including, sequentially 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 and a sixth lens, each of which has refractive power. An object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface; an image-side surface of the second lens is a concave surface; and an object-side surface of sixth lens is a concave surface. A distance TTL along the optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging lens group and half of a diagonal length ImgH of an effective pixel area on the imaging plane of the optical imaging lens group satisfy TTL/ImgH≤1.23.