Five-Element Camera Lens Design for Compact Imaging
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Solution Overview
Problem
There is a growing demand for ultra-thin wide-angle camera lenses with excellent optical characteristics and fully corrected chromatic aberration for handheld devices, which existing lens structures fail to meet due to limitations in miniaturization and imaging quality.
Innovation Solution
A five-piece camera optical lens design comprising specific refractive power configurations and materials, including glass and plastic lenses, with aspherical surfaces and optimized refractive indices and thicknesses to achieve a compact form factor and improved imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-piece or more lens structure is adopted to improve imaging quality and correct chromatic aberration, then imaging quality is improved, but the total optical length increases and miniaturization becomes difficult
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive indices and Abbe numbers for each lens element, and by optimizing curvature radii and thickness parameters. The five-piece lens structure uses materials with carefully selected optical parameters (refractive indices ranging from 1.46 to 2.05, Abbe numbers from 20 to 60) to achieve chromatic aberration correction while maintaining a compact total optical length of 4.6mm or less.
Solution Approach 2:
The patent employs composite materials by combining multiple lens elements made from different optical materials with varying refractive indices and dispersion characteristics. This includes using both high-refractive-index materials (for strong aberration correction) and low-refractive-index materials (for reducing optical path length), creating a composite optical system that achieves superior imaging quality in a miniaturized form factor.
2Volume of moving object
If the pixel size of photosensitive devices is reduced to achieve miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the optical system into five distinct lens elements, each with specific functions for correcting different types of aberrations. This segmented approach allows each element to be optimized for its specific role (e.g., first element for spherical aberration, second and third for chromatic aberration, fourth and fifth for field curvature and distortion), thereby maintaining high imaging quality despite the reduced pixel size and compact form factor.
Solution Approach 2:
The patent implements local quality by assigning different material properties and optical characteristics to different regions of the optical system. Each lens element has locally optimized parameters (curvature radii, thickness, refractive index) tailored to its specific position and function within the overall optical system, enabling high-resolution imaging across the entire sensor area even in miniaturized devices.
3Length of moving object
If a compact lens design is used to achieve miniaturization, then total optical length is reduced, but aperture size is limited and low-illumination performance deteriorates
Solution Approach 1:
The patent applies dimensionality change by optimizing the radial dimensions (aperture diameter) independently from the axial dimension (total optical length). The five-piece lens design allows for a larger relative aperture (F-number 1.8 or less) by distributing optical power across multiple elements with different curvature profiles, thereby increasing light-gathering capability in the radial direction while maintaining a compact 4.6mm length in the axial direction.
Solution Approach 2:
The patent utilizes spheroidality by employing aspherical surfaces on multiple lens elements to correct spherical aberration and optimize light path geometry. The carefully designed curvature radii and aspherical coefficients enable each lens element to efficiently redirect light rays, maximizing the effective aperture area within the constrained total optical length and improving low-illumination 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 design achieves a short total optical length, large aperture, and enhanced imaging quality, suitable for low-illumination environments while maintaining miniaturization and effectively correcting aberrations, thus addressing the need for high-quality, compact camera lenses.
Implementation Method 1
the first lens has a positive refractive power with a convex object side surface relative to the proximal axis
Implementation Method 2
the second lens has a negative refractive power with a concave image side surface relative to the proximal axis
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, an aperture, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The camera optical lens further satisfies specific conditions.