Five-Element Camera Lens for Wide-Angle Miniaturization
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Solution Overview
Problem
There is a need for a miniaturized camera optical lens with excellent optical characteristics, wide-angle capabilities, and full correction of aberrations for handheld devices and imaging systems, which existing multi-piece lenses struggle to achieve due to constraints in size and image quality requirements.
Innovation Solution
A five-piece camera optical lens design comprising lenses with specific refractive powers and curvature radii, optimized for ultra-thin and wide-angle performance, with constraints on focal lengths, thicknesses, and curvature ratios to correct aberrations and maintain a large aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-piece lens structure is used to improve image quality, then optical characteristics are improved, but device complexity increases
Solution Approach 1:
The lens is divided into five separate lens elements with different refractive powers (positive, negative, positive, negative, positive) arranged in sequence. Each lens element is optimized for specific aberration correction, allowing the system to achieve excellent optical characteristics while maintaining manageable complexity through modular design
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1/f, f2/f, f3/f, f4/f, f5/f), thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL), and curvature radii (R1-R10). By optimizing these parameters within defined ranges, the system achieves superior optical performance without excessive complexity
2Volume of moving object
If pixel size is reduced to enable miniaturization, then device size is reduced, but image quality deteriorates
Solution Approach 1:
The lens design addresses the miniaturization challenge by optimizing the spatial arrangement of lens elements along the optical axis and utilizing curved surfaces with specific curvature radii. The five-element structure packs refractive power efficiently in a compact configuration, achieving both miniaturization and high image quality for small-pixel sensors
Solution Approach 2:
The patent employs curved lens surfaces with specifically designed curvature radii (R1-R10) for each lens element. These curved surfaces enable effective correction of optical aberrations in a compact design, allowing high image quality to be maintained despite the reduced pixel size and miniaturized lens structure
3Illumination intensity
If aperture is increased to improve light gathering capability, then optical characteristics are improved, but aberrations worsen
Solution Approach 1:
The lens structure uses alternating positive and negative lens elements as intermediaries to correct aberrations. The negative lens elements (L2 and L5) act as mediators between the positive lens elements, compensating for optical aberrations introduced by the larger aperture while maintaining excellent optical characteristics
Solution Approach 2:
The patent specifies precise parameter ranges including focal length ratios (f2/f between -7.00 and -2.00, f4/f between 0.36 and 1.43) and curvature radius ratios (R6/R5 between 3.00 and 12.00) to optimize the balance between aperture and aberration correction, achieving both large aperture and minimal aberrations
4Volume of moving object
If lens thickness is reduced for miniaturization, then device size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent defines specific thickness ratios for each lens element (d1/TTL between 0.18 and 0.40, d3/TTL between 0.01 and 0.08, d5/TTL between 0.02 and 0.10, d7/TTL between 0.06 and 0.24, d9/TTL between 0.03 and 0.11). By optimizing these thickness parameters within the given ranges, the system achieves miniaturization while maintaining excellent optical performance through efficient light path management
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 design achieves excellent optical performance with a wide field of view, corrected aberrations, and a large aperture, making it suitable for high-pixel CCD and CMOS camera lenses, while maintaining the miniaturization and portability required for handheld devices.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power
Data Source
AI summary
The present invention includes a camera optical lens including, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a refractive power, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power. The camera optical lens satisfies the following conditions: 0.18≤d1/TTL≤0.40, 0.60≤ET1/d1≤1.00, −7.00≤f2/f≤−2.00, and 3.00≤R6/R5≤12.00. The camera optical lens according to the present invention has excellent optical characteristics, such as large aperture, wide angle, and ultra-thin.