Six-Element Camera 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 aberration, particularly for handheld devices like smartphones and digital cameras, where the increasing demand for miniature lenses with improved imaging quality is not adequately met by existing lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of plastic with specific refractive powers and curvature radii, optimized to achieve a short total optical length, low sensitivity, and improved aberration correction, facilitating the development of ultra-thin and wide-angle lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens pieces is increased to correct aberration and improve imaging quality, then the imaging quality improves, but the total optical length increases and the lens becomes thicker
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and curvature radii of each lens element. Specifically, it sets the refractive index of the third lens between 1.66-1.70 and the fourth lens between 1.50-1.56, while controlling curvature radii ratios (R5/R6 between 1.50-3.00, R7/R8 between 0.50-2.00). These parameter optimizations enable effective aberration correction with a compact six-element structure, achieving full correction of on-axis and off-axis aberrations while maintaining an ultra-thin profile with total optical length controlled within specific ratios relative to focal length.
Solution Approach 2:
The patent employs composite materials by combining lens elements with different refractive index ranges and Abbe number characteristics. The first and second lenses use materials with refractive indices 1.50-1.60 and 1.60-1.70 respectively, while the third lens uses high-refractive-index material (1.66-1.70). This strategic combination of optical materials with complementary properties enables comprehensive aberration correction across the optical spectrum while maintaining a compact form factor.
2Volume of moving object
If the lens structure is miniaturized for handheld devices, then the device size decreases, but the aberration correction becomes more difficult and imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different regions of the lens system. Each lens element is designed with localized optical properties: the third lens (with refractive index 1.66-1.70) specifically targets spherical aberration correction, while the fourth lens (with refractive index 1.50-1.56) focuses on coma and astigmatism correction. The aspherical surfaces are strategically positioned at specific locations (object-side of first lens, image-side of second lens, object-side of fourth lens) to address local aberration problems in different field regions, enabling effective aberration correction in the miniaturized six-element structure.
Solution Approach 2:
The patent employs spheroidality by incorporating aspherical surfaces on specific lens elements to correct aberrations that cannot be addressed by simple spherical surfaces. The aspherical profiles are applied to the object-side surface of the first lens, the image-side surface of the second lens, and the object-side surface of the fourth lens. These aspherical configurations enable precise control of light ray paths, effectively correcting off-axis aberrations such as coma and astigmatism while maintaining the compact miniaturized form factor required for handheld devices.
3Adaptability or versatility
If the lens is designed for wide-angle application, then the field of view increases, but the distortion and off-axis aberration increase
Solution Approach 1:
The patent applies segmentation by dividing the optical correction function across six distinct lens elements, each with specific refractive index ranges and curvature characteristics. The wide-angle correction is distributed: the first two lenses (with refractive indices 1.50-1.60 and 1.60-1.70) handle initial light convergence, the third lens (1.66-1.70) corrects spherical aberration, the fourth lens (1.50-1.56) addresses coma and astigmatism, and the fifth and sixth lenses (1.50-1.60) refine the image. This segmented approach enables effective control of distortion and off-axis aberrations across a wide field of view (70-90 degrees diagonal).
Solution Approach 2:
The patent applies dimensionality change by transitioning from simple spherical surfaces to complex aspherical surfaces on key lens elements. The aspherical profiles on the object-side of the first lens, image-side of the second lens, and object-side of the fourth lens introduce additional geometric dimensions for controlling light paths. This dimensional enhancement enables precise correction of wide-angle distortion and off-axis aberrations, achieving excellent imaging quality across the expanded 70-90 degree diagonal field of view.
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 characteristics, including full correction of on-axis and off-axis aberrations, maintaining miniaturization while enhancing imaging quality and reducing sensitivity, thereby addressing the demand for better performance in miniature camera lenses.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, from an object side to an image side... the first lens L1 has a negative refractive power, the second lens has a positive refractive power, and the third lens has a negative refractive power
Data Source
AI summary
The present disclosure relates to the technical 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 a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens and a sixth lens. The camera optical lens satisfies following conditions: 10.00≤f2/f3≤20.00 and 1.00≤d2/d4≤3.00, where f2 denotes a focal length of the second lens; f3 denotes a focal length of the third lens; d2 denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens; and d4 denotes an on-axis distance from an image-side surface of the second lens to an object-side surface of the third lens.