Six-Lens Optical System for Compact Camera Module Design
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Solution Overview
Problem
Existing camera lenses for portable electronic devices have a large outer diameter and volume, leading to a "notch screen" issue that limits the improvement of the screen-to-body ratio.
Innovation Solution
The optical lens design consists of a sequence of aspherical lenses with specific focal powers and surface shapes, including a stop, a first lens with positive focal power, and subsequent lenses with negative and positive focal powers, optimized to meet specific expressions for focal length, image height, and lens thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If existing camera lens design is used, then imaging function is achieved, but outer diameter of front portion is large causing notch screen issue
Solution Approach 1:
The optical lens is divided into six individual lens elements (first lens through sixth lens) with alternating positive and negative focal powers. Each lens element has specific surface shapes (convex or concave in paraxial regions) that are optimized to reduce the overall front portion diameter while maintaining imaging performance. This segmentation allows for compact arrangement and reduced total optical length.
Solution Approach 2:
Each lens element has non-uniform surface shapes with different regions (paraxial vs. marginal zones) having different curvatures. For example, the first lens has a convex object side surface and a concave image side surface in the paraxial region, with at least one inflection point. This local quality variation optimizes light path control to reduce the front portion diameter while maintaining imaging quality across the field.
2Length of moving object
If existing camera lens design is used, then imaging function is achieved, but total optical length is large
Solution Approach 1:
The optical system is segmented into six lens elements with alternating focal powers (positive, negative, positive, negative, positive, negative). This segmentation enables compact folding of the optical path, reducing the total optical length from object to image plane while distributing the optical power across multiple elements to maintain imaging quality.
Solution Approach 2:
Each lens element features aspherical surfaces with specific curvature characteristics. The object side and image side surfaces of each lens have defined curvature signs (convex or concave in paraxial regions) and may include inflection points. These curvature variations optimize the optical path length and focus control, enabling short total optical length without sacrificing imaging resolution.
3Volume of moving object
If lens elements are reduced in size, then compact architecture is achieved, but resolution may be compromised
Solution Approach 1:
Each lens element incorporates aspherical surfaces with locally varied curvature. The paraxial regions have specific convex/concave shapes while marginal regions have different curvatures, with at least one inflection point on certain surfaces. This local quality optimization ensures that light rays from different field zones are properly focused, maintaining high resolution despite the compact overall lens volume.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal power signs, surface curvature characteristics, and the presence of inflection points. These parameter optimizations ensure that the compact lens configuration achieves both small volume and high imaging resolution by carefully controlling the optical path through each element.
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 architecture with high resolution, reducing the outer diameter of the front portion and the total optical length, thereby improving the screen-to-body ratio and enabling ultra-high definition imaging.
Implementation Method 1
the optical lens sequentially includes: a stop, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has a positive focal power, an object side surface of the first lens is convex, a paraxial region of an image side surface of the first lens is concave and the image side surface of the first lens has at least one inflection point.
Data Source
AI summary
The disclosure provides an optical lens, a camera module and a terminal. The optical lens sequentially includes: a stop; a first lens with positive focal power, a convex object side surface, and an image side surface with a concave paraxial region; a second lens with negative focal power, a concave image side, and an object side surface with a convex paraxial region; a third lens with a positive focal power, both an object surface and an image surface are concave at a paraxial region thereof; a fourth lens with a negative focal power, a concave object side surface and a convex image side surface; a fifth lens with positive focal power, an object surface and an image surface are convex at a paraxial region thereof; and a sixth lens with a negative focal power, bath an object surface and an image surface are concave at a paraxial region thereof.