7-Lens Camera Optical Lens for Ultra-Thin Wide-Angle Imaging
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones, where the shrinking pixel size of photosensitive devices and increasing demand for high imaging quality require advanced lens designs.
Innovation Solution
A 7-piece camera optical lens structure is designed, with specific conditions for the focal lengths, refractive indices, and curvature radii of each lens to achieve ultra-thin and wide-angle capabilities, including the use of glass and plastic materials, and optical filters to correct aberrations and maintain miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the lens can be kept simple and compact, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven distinct lens elements (L1-L7) with different materials and optical properties. Each lens element is optimized independently to correct specific aberrations, with glass lenses (L1, L3) providing high refractive power and plastic lenses (L2, L4-L7) providing aberration correction, achieving superior imaging quality through segmented functional design
Solution Approach 2:
The patent employs composite material construction by combining glass and plastic materials in a single lens system. Specifically, L1 and L3 are made of glass material while L2, L4, L5, L6, and L7 are made of plastic material. This composite approach allows each material to contribute its advantageous properties: glass provides high refractive index and low dispersion for chromatic aberration correction, while plastic provides ease of manufacturing aspheric surfaces and cost-effectiveness
2Length of moving object
If the lens is made ultra-thin for handheld devices, then the device size is reduced, but the optical performance and aberration correction become difficult to maintain
Solution Approach 1:
The patent employs extensive parameter optimization across seven lens elements, including refractive indices (n1=1.7464, n2=1.6510, n3=1.7726, n4=1.5441, n5=1.5352, n6=1.5855, n7=1.5352), Abbe numbers (v1=55.29, v2=21.51, v3=21.72, v4=56.12, v5=56.12, v6=29.91, v7=56.12), curvature radii (R1-R14), and thickness ratios (d1/TTL=0.1152, d3/TTL=0.0466, d5/TTL=0.0384, d7/TTL=0.0960, d9/TTL=0.1512, d11/TTL=0.0609, d13/TTL=0.0552). These precisely controlled parameters enable ultra-thin design while maintaining excellent optical performance including corrected chromatic and spherical aberrations
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lens elements to correct spherical aberration and other optical imperfections. The aspheric design allows for more precise control of light rays passing through the lens, enabling superior imaging quality in a compact form factor by eliminating the need for additional correction lenses that would increase overall length
3Illumination intensity
If the aperture is made large for better light gathering, then the imaging quality improves, but the lens thickness and complexity increase
Solution Approach 1:
The patent applies local quality optimization by assigning different material properties and optical characteristics to specific regions of the lens system. Glass lenses (L1, L3) with high refractive indices and low dispersion are positioned where high refractive power is needed for aperture control, while plastic lenses (L2, L4-L7) are positioned where aberration correction is most beneficial. This localized material assignment allows large aperture design without proportionally increasing thickness
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 high-performance imaging with corrected on-axis and off-axis chromatic aberrations, maintaining a short total optical length and large aperture, ensuring excellent optical characteristics and miniaturization for handheld devices.
Implementation Method 1
the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has negative optical power, the fourth lens L4 has positive optical power
Implementation Method 2
an optical filter GF can be arranged between the seventh lens L7 and the image surface Si
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens further satisfies specific conditions.