Seven-Lens Optical Assembly for Compact High-Aperture Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems with wide view angles and large apertures face challenges in achieving compactness, high image quality, and sufficient field of view while maintaining low sensitivity and molding complexity, making them unsuitable for current technological demands.
Innovation Solution
A photographing lens assembly comprising seven lens elements with specific refractive powers and surface curvatures, including positive and negative refractive powers, concave and convex surfaces, and air gaps between adjacent lens elements to optimize image quality, compactness, and reduce sensitivity, while satisfying conditions such as |f/R11| + |f/R12| < 0.95 and TL/EPD < 2.80.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems use wide view angle and large aperture configurations, then image quality is improved, but the system size increases and manufacturing complexity increases
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers and surface curvatures. Each lens element is independently designed with precise curvature radii (R1-R14) and thicknesses (d1-d7), allowing complex optical functions to be distributed across multiple simpler components rather than requiring a single complex lens configuration
Solution Approach 2:
Different regions of the lens elements have different surface curvatures and refractive properties. The object-side and image-side surfaces of each lens element have specifically designed curvature radii (e.g., R3 and R4 for the second lens element, R11 and R12 for the sixth lens element) to correct aberrations in different field regions, achieving high image quality through localized optical property optimization
2Illumination intensity
If conventional optical systems increase aperture size, then light gathering ability is improved, but sensitivity increases and system compactness deteriorates
Solution Approach 1:
The seven lens elements are arranged in a compact nested configuration along the optical axis, with each element positioned close to the others. The axial distance from the object-side surface of the first lens element to the image surface (TL) is minimized while maintaining the required aperture (EPD), creating a compact nested structure that achieves large aperture without proportional increase in system length
Solution Approach 2:
The system achieves compactness through precise control of geometric parameters including curvature radii (R1-R14), thicknesses (d1-d7), and axial distances between elements. By optimizing these parameters to satisfy specific conditions (|f/R11| + |f/R12| < 0.95, TL/EPD < 2.80), the system achieves large aperture with minimized axial length
3Manufacturing precision
If conventional optical systems use complex lens configurations, then image quality is improved, but molding problems increase and assembling yield rate decreases
Solution Approach 1:
The optical system is divided into seven independently manufacturable lens elements with relatively simple individual geometries. Each lens element can be molded or glass-formed separately using standard processes, avoiding the need for complex multi-element cemented lenses or freeform surfaces that would increase manufacturing difficulty and reduce yield
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 the production of a compact optical system with improved image quality, increased aperture, and reduced sensitivity, suitable for various electronic devices by balancing refractive power distribution and correcting aberrations, thereby meeting the requirements of high image quality and compactness.
Implementation Method 1
The second lens element has positive refractive power. The seventh lens element has an image-side surface being concave in a paraxial region thereof
Data Source
AI summary
A photographing lens assembly includes seven lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The second lens element has positive 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 shape in an off-axis region thereof.