Eight-Lens Camera Group for Thin Portable Devices
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Solution Overview
Problem
The challenge is to design a camera lens group for portable electronic devices that achieves high imaging quality, super-large image surface, super thinness, and large aperture while maintaining manufacturability and low sensitivity, which existing multi-lens systems often fail to balance effectively.
Innovation Solution
A camera lens group comprising eight lenses with specific focal powers, surface types, and on-axis spacings is configured to achieve balanced aberration correction, reduced size, and improved manufacturability, featuring positive and negative focal powers, convex and concave surfaces, and aspherical lens surfaces to optimize imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to achieve higher imaging quality, super-large image surface, and large aperture, then imaging performance is improved, but device thickness and complexity increase
Solution Approach 1:
The lens group is divided into eight individual lens elements with specific focal powers arranged in sequence along the optical axis. This segmentation allows each lens to contribute to aberration correction and imaging quality while maintaining a compact overall structure that fits within thin portable devices.
Solution Approach 2:
The patent specifies precise parameter ranges including focal lengths (f1 through f8), air spaces between lenses (T12 through T78), and curvature radii (R1 through R15) to optimize the balance between imaging quality and device thickness. By carefully controlling these parameters, the system achieves high performance without excessive thickness.
2Manufacturing precision
If the number of lenses is increased to achieve super-large image surface and high imaging quality, then optical performance is improved, but manufacturing complexity and sensitivity increase
Solution Approach 1:
The complex optical system is segmented into eight manageable lens elements with well-defined functions. Each lens has specific focal power characteristics that contribute to the overall aberration correction, making the complex system more manufacturable and less sensitive to individual element variations.
Solution Approach 2:
Different lens elements have different focal powers (positive and negative) and surface curvatures tailored to their specific positions in the optical path. This local optimization allows each lens to address specific aberration types, reducing the overall sensitivity of the system while achieving high imaging quality across a large image surface.
3Manufacturing precision
If the number of lenses is increased to achieve large aperture and high imaging quality, then optical performance is improved, but device size and weight increase
Solution Approach 1:
The lens group uses eight segmented lens elements instead of fewer larger lenses, allowing for more efficient light gathering and aberration correction. This segmentation enables achieving large aperture effects with smaller individual components, reducing overall device weight while maintaining high imaging quality.
Solution Approach 2:
The patent optimizes the focal length parameters and air space distances to achieve a compact configuration that minimizes device weight. By carefully selecting focal lengths and spacing, the system achieves large aperture performance without requiring excessive glass material or device bulk.
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 camera lens group with high imaging quality, large image surface, thinness, and large aperture, while ensuring manufacturability and low sensitivity, effectively addressing the limitations of existing multi-lens systems.
Implementation Method 1
A camera lens group comprising eight lenses with focal power, which sequentially include, from an object side to an image side along an optical axis, a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens with focal power
Data Source
AI summary
The disclosure discloses a camera lens group, which sequentially includes, from an object side to an image side along an optical axis, a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and eighth lens with focal power, wherein the first lens, the fourth lens, the sixth lens and the seventh lens have positive focal power; the eighth lens has negative focal power; a total effective focal length f of the camera lens group and a maximum Semi-Field of View (Semi-FOV) of the camera lens group meet f×tan(Semi-FOV)>6.0 mm; and the total effective focal length f of the camera lens group and an effective focal length f7 of the seventh lens meet 0.44/f7<1.2.