Five-Element Imaging Lens Balancing Refractive Power for Compact Wide-Angle Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional miniaturized lens modules with wide angles of view face challenges in reducing size while maintaining image quality, due to the need for larger lens elements to capture a wider field of view, which increases the total track length and limits the field of view.
Innovation Solution
The proposed imaging optical lens assembly consists of five lens elements with specific refractive powers and surface curvatures, including a first lens element with negative refractive power and a concave object-side surface, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power and a concave image-side surface. This configuration balances the refractive power and minimizes the total track length while achieving a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If lens elements are made larger to capture wider field of view, then field of view is improved, but total track length increases
Solution Approach 1:
The patent applies nesting by placing the aperture stop between the first and second lens elements, allowing the light path to be efficiently managed within a compact configuration. This nested arrangement enables wider field of view capture without proportionally increasing the total track length, as the stop optimizes light routing through the lens assembly.
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lens elements, introducing complex curvature variations in multiple dimensions. This allows the lens assembly to capture wider field of view by bending light paths in non-linear ways, achieving expanded angular coverage without simply increasing the linear dimensions of individual lens elements or the overall track length.
2Area of stationary object
If lens elements are made larger to capture wider field of view, then field of view is improved, but device size increases
Solution Approach 1:
The aperture stop is nested between lens elements, optimizing the spatial arrangement to maximize field of view while minimizing the overall volume occupied by the lens assembly. This nested configuration allows efficient light path management within a compact footprint.
Solution Approach 2:
Aspheric surfaces on the lens elements enable complex three-dimensional light path control, allowing wider field of view to be achieved without proportionally increasing device volume. The multi-dimensional curvature variations enable compact lens design with expanded angular coverage.
3Manufacturing precision
If more lens elements are added to correct aberrations, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the lens elements by implementing aspheric surfaces instead of traditional spherical surfaces. This parameter change allows effective aberration correction with a moderate number of lens elements, as the aspheric profiles provide additional degrees of freedom for optimizing light path control and reducing optical defects.
Solution Approach 2:
The aperture stop is strategically positioned between specific lens elements to locally optimize light path control at critical points in the optical system. This localized quality enhancement allows effective aberration correction without requiring an excessive number of lens elements, thereby managing overall device complexity.
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 described lens assembly effectively achieves a wide field of view while maintaining a compact size, improving image quality by balancing refractive power and correcting aberrations, and is suitable for various intelligent electronic devices.
Implementation Method 1
a first lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof; a second lens element having positive refractive power; a third lens element having negative refractive power; a fourth lens element having positive refractive power; and a fifth lens element with negative refractive power
Data Source
AI summary
The present disclosure provides an imaging optical lens assembly, including, in order from an object side to an image side: a first lens element with negative refractive power having an object-side surface being concave in a paraxial region, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, and a fifth lens element with negative refractive power having an image-side surface being concave in a paraxial region and at least one convex shape in an off-axial region on the image-side surface, wherein the imaging optical lens assembly has a total of five lens elements.