Eight-Lens Imaging Optical System Balancing Image Quality and Compactness
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, appropriate aperture size, miniaturization, and desirable field of view, especially with the increasing functionality requirements of electronic devices.
Innovation Solution
An imaging optical lens system comprising eight lens elements, specifically designed to achieve a balance among high image quality, low sensitivity, appropriate aperture size, miniaturization, and desirable field of view, by optimizing the refractive power distribution, surface shapes, and material selection of the lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The lens system is divided into eight distinct lens elements with specific refractive power assignments (positive, negative, and mixed) arranged in a defined sequence. Each lens element has optimized surface shapes (convex/concave configurations) and material properties (Abbe numbers) to address specific optical aberrations independently, allowing the system to achieve high image quality while managing complexity through functional segmentation
Solution Approach 2:
Different lens elements are assigned different refractive powers and material properties based on their position in the optical path. For example, the first lens element has positive refractive power with specific Abbe number ranges, while the second has negative refractive power. Each lens surface (object-side and image-side) has optimized curvature radii and aspheric coefficients tailored to its local optical function, enabling precise control of light propagation at each stage
2Use of energy by moving object
If the aperture size is increased to improve light gathering capability, then light gathering capability is improved, but sensitivity increases and miniaturization becomes difficult
Solution Approach 1:
The system optimizes the aperture size parameter within specific numerical ranges (e.g., f-number constraints) to balance light gathering capability with sensitivity control. The aperture diameter is carefully selected relative to the focal length and lens element dimensions, allowing the system to maintain appropriate light intake while preventing excessive sensitivity that would compromise miniaturization goals
3Area of moving object
If the field of view is enlarged to improve coverage area, then field of view is improved, but image quality and compactness become difficult to maintain
Solution Approach 1:
Multiple lens surfaces are designed with aspheric shapes characterized by conic coefficients and higher-order aspheric terms. These curved surfaces are strategically positioned (e.g., object-side and image-side surfaces of specific lens elements) to correct off-axis aberrations and maintain image quality across an enlarged field of view, allowing the system to achieve wide coverage without sacrificing sharpness or compactness
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 proposed imaging optical lens system effectively achieves a balance of performance metrics, enhancing image quality, reducing sensitivity, and maintaining compactness while offering a suitable field of view, thus addressing the limitations of conventional systems.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has negative refractive power.
Data Source
AI summary
An imaging optical lens system includes eight lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The seventh lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the seventh lens element has at least one convex critical point in an off-axis region thereof.