Four-Lens Camera Optical Lens Design for Mobile Imaging
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Solution Overview
Problem
There is an urgent need for a camera optical lens with good optical performance, particularly for handheld terminal devices, as existing lenses struggle to achieve optimal imaging quality due to the miniaturization of pixel sizes and the demand for lightweight, thin, and portable electronic products.
Innovation Solution
A camera optical lens design comprising four lenses, each with specific refractive powers and thicknesses, is proposed. The lens configuration includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with positive refractive power. The design satisfies several relational expressions that optimize the lens's optical characteristics, such as focal lengths, refractive indices, and curvature radii.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-lens structure is used to improve imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The optical system is divided into four distinct lens elements with specific refractive power configurations (positive, negative, positive, positive). Each lens element is optimized for specific optical functions, allowing complex imaging requirements to be met through modular design rather than a single complex lens
Solution Approach 2:
Each lens element has specifically designed curvature radii and thickness ratios that optimize local optical properties. For example, the first lens has an object-side convex surface with specific curvature radius R1, and the second lens has concave surfaces with curvature radii R3 and R4, creating localized optical corrections throughout the system
2Volume of moving object
If pixel size of the optical sensor is reduced to achieve miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges including focal length ratios (f1/f, f2/f, f3/f, f4/f), thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL), and curvature radius relationships (R1/R2, R3/R4, R5/R6, R7/R8) that optimize the optical system for miniaturized sensor formats while maintaining image quality
Solution Approach 2:
The patent controls the total optical length TTL relative to focal length f within the range 1.0 < TTL/f < 2.0, effectively managing the axial dimension of the optical system to achieve compact form factor suitable for mobile devices with reduced sensor sizes
3Length of stationary object
If the total optical length is reduced to achieve thinness, then device thickness is reduced, but optical performance deteriorates
Solution Approach 1:
The patent establishes specific parameter relationships including the total optical length constraint (1.0 < TTL/f < 2.0) and individual lens thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL) that balance compactness with adequate optical path length for quality imaging
Solution Approach 2:
The optical system uses a combination of positive and negative refractive powers across the four lenses, creating a dynamic optical path that folds light effectively within the constrained TTL, allowing compact design without sacrificing optical performance
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 proposed camera optical lens achieves good optical characteristics and performance, making it suitable for high-resolution camera elements in mobile phone camera lenses, vehicle-mounted lenses, and web camera lenses, while also enabling miniaturization and improved imaging quality.
Implementation Method 1
a first lens having positive refractive power
Implementation Method 2
a second lens having negative refractive power
Implementation Method 3
a third lens having positive refractive power
Implementation Method 4
a fourth lens having positive refractive power
Data Source
AI summary
The present disclosure relates to the field of optical lens, and discloses a camera optical lens. The camera optical lens includes from an object side to an image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power; and following relational expressions are satisfied: 1.50≤TTL/f≤2.50; 1.00≤f1/f≤1.50; −12.00≤f2/d3<−4.00; n1≥1.70; and 1.50≤d7/d5≤5.00. The camera optical lens has good optical characteristics and good optical performance, and is particularly suitable for a mobile phone camera lens assembly, a vehicle-mounted lens and a WEB camera lens composed of camera elements such as CCD, CMOS with high resolution.