Five-Lens Optical Assembly for Compact Track Length
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems with large apertures or wide view angles are difficult to integrate into compact electronic devices due to their long track lengths and low image quality, making it challenging to achieve both compact size and high image quality.
Innovation Solution
An optical photographing lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including positive and negative refractive powers, aspheric surfaces, and critical points, optimized to reduce total track length, correct aberrations, and enhance image quality while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional optical systems with large aperture or wide view angle are used, then image quality and field of view are improved, but track length and device size increase
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, second, third, and fifth lens elements) to replace traditional spherical surfaces. This curvature optimization enables better control of light paths, achieving wide field of view (35-50 degrees) while reducing track length by eliminating spherical aberrations and improving focusing efficiency.
Solution Approach 2:
The patent optimizes specific parameter ratios including axial distance ratios (T12/T23, T23/T34), focal length ratios (f/f1, f/|f2|, f/|f3|), and curvature radii relationships. These parameter changes enable compact lens spacing while maintaining optical performance, achieving track length reduction without sacrificing field of view or image quality.
2Manufacturing precision
If conventional optical systems with large aperture or wide view angle are used, then image quality is improved, but device size increases
Solution Approach 1:
Aspheric surfaces on the first, second, third, and fifth lens elements correct optical aberrations (spherical aberration, coma, astigmatism) to improve image quality. This enables high-resolution imaging in compact devices by eliminating the need for additional corrective lenses that would increase device volume.
Solution Approach 2:
The optical system is divided into five distinct lens elements with specific refractive power distributions (positive, negative, and mixed). This segmentation allows each element to address specific optical functions, achieving superior image quality while keeping individual element sizes and overall device volume compact.
3Length of stationary object
If track length is reduced for compact devices, then device size is reduced, but image quality deteriorates
Solution Approach 1:
Aspheric surfaces enable effective aberration correction within shorter optical paths. The curved surfaces optimize light convergence and divergence, maintaining sharp focus and high image quality even when track length is reduced, by compensating for the shorter propagation distance.
Solution Approach 2:
Optimized parameter ratios (axial distances, focal lengths, curvature radii) ensure that each lens element contributes maximally to image quality within the constrained track length. The specific relationships between parameters (e.g., T12/T23, f/f1) are tuned to achieve diffraction-limited performance in compact configurations.
4Manufacturing precision
If five lens elements with complex surfaces are used, then optical performance is improved, but manufacturing complexity increases
Solution Approach 1:
While aspheric surfaces improve optical performance, the patent designs them with practical manufacturing considerations. The aspheric coefficients are optimized to balance performance gains with manufacturing feasibility, using standard aspheric surface equations that can be produced with contemporary molding or grinding techniques.
Solution Approach 2:
The patent specifies parameter ranges and relationships (axial distances, focal lengths, curvature radii) that optimize performance while considering manufacturing tolerances. These parameter constraints guide the design toward solutions that achieve high optical performance without requiring ultra-precise or costly manufacturing processes.
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 development of compact optical systems with a large field of view and high image quality, suitable for high-end electronic devices, by tightly arranging lens elements and optimizing refractive power distribution, thus addressing the limitations of conventional systems.
Implementation Method 1
The first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with negative refractive power, the fourth lens element with positive refractive power, and the fifth lens element with negative refractive power
Data Source
AI summary
An optical photographing lens assembly includes five lens elements, 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 and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface in a paraxial region thereof. The second lens element with negative refractive power has a convex object-side surface and a concave image-side surface in a paraxial region thereof. The fourth lens element with positive refractive power has a convex image-side surface in a paraxial region thereof. The fifth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one convex critical point in an off-axial region thereof, and two surfaces of the fifth lens element are both aspheric.