Seven-Lens Imaging System Compact Design
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Solution Overview
Problem
Current imaging lenses for compact devices like smartphones and tablets face challenges in achieving high resolution and short total length while maintaining a small F number, especially with increasing pixel sizes and the demand for wider angles of view.
Innovation Solution
A seven-lens configuration imaging lens system with specific refractive powers and surface shapes, including aspherical surfaces, optimized to achieve a short total length and small F number, along with the use of an aperture stop to correct aberrations and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to five or more to improve imaging performance, then imaging performance is improved, but the total length of the lens system increases
Solution Approach 1:
The patent employs a compact seven-lens configuration where lenses are arranged in a nested-like structure with optimized spacing and positioning. The lenses are closely integrated with minimal air gaps, allowing high imaging performance to be achieved while keeping the total length short, effectively nesting multiple optical elements within a compact form factor.
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lenses (first, third, fifth, and seventh lenses) to change the geometric parameters of the optical elements. This allows for better aberration correction and improved imaging performance without requiring additional lens elements that would increase the total length, thus resolving the contradiction between performance and compactness.
2Illumination intensity
If the F number is reduced to improve light gathering capability, then light gathering capability is improved, but the lens system becomes more complex and longer
Solution Approach 1:
The patent employs aspherical surfaces on multiple lenses to optimize light path curvature and control ray angles. This allows the system to achieve a small F number (high light gathering capability) while maintaining a compact length, as the aspherical shapes efficiently redirect light rays without requiring additional optical elements that would extend the system length.
3Measurement precision
If the pixel size is reduced to increase the number of pixels, then resolution is improved, but the lens system must be more precise and complex
Solution Approach 1:
The patent uses aspherical surfaces on multiple lenses to change the geometric parameters of the optical elements, enabling precise control of light paths. This allows the system to maintain high imaging performance suitable for high-resolution imaging elements (5 megapixels or greater) while avoiding the need for even more complex lens configurations, thus achieving high resolution without excessive complexity.
4Length of moving object
If the total length is reduced for compact devices, then device compactness is improved, but imaging performance deteriorates
Solution Approach 1:
The patent arranges seven lenses in a compact nested configuration with optimized spacing, allowing the entire lens system to fit within a short total length while maintaining the optical performance required for high-resolution imaging. The lenses are positioned and sized to maximize optical efficiency within the constrained space.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses to optimize light path control within the compact form factor. The aspherical shapes enable better aberration correction and improved imaging performance despite the reduced total length, resolving the contradiction between compactness and 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 solution enables high imaging performance from central to peripheral angles of view, allowing for high-resolution images with a compact lens system suitable for portable devices, addressing the limitations of existing lenses in terms of length and F number.
Implementation Method 1
a first lens (L1) having a positive refractive power and a convex surface toward an object side
Implementation Method 2
a second lens (L2) having a negative refractive power
Implementation Method 3
an aperture stop, provided between the first lens and the second lens or between the second lens and the third lens
Implementation Method 4
a seventh lens (L7) having a negative refractive power, a concave surface toward an image side, and at least one inflection point on the surface toward the image side
Data Source
AI summary
An imaging lens substantially includes seven lenses, constituted by: a first lens having a positive refractive power and a convex surface toward an image side; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens; a fifth lens having a positive refractive power; a sixth lens; and a seventh lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. All of the first lens through the seventh lens are single lenses.