Imaging Lens Assembly Aberration Correction Compact Design
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Solution Overview
Problem
Conventional compact imaging lens assemblies for mobile phone cameras are insufficient for high-resolution imaging due to increased resolution demands and pixel size reduction, leading to a need for more lens elements that compromise the compact form.
Innovation Solution
An imaging lens assembly with a specific arrangement of five lens elements, including a first lens with positive refractive power, a second and third with negative refractive power, a fourth with positive refractive power, and a fifth with a concave image-side surface and inflection points, along with an aperture stop placement between the object and third lens element, to correct aberrations and maintain a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more lens elements are added to achieve higher image quality, then aberration correction improves, but total track length increases making the lens assembly non-compact
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of five lens elements to achieve effective aberration correction while maintaining a compact total track length. Specific parameter relationships are defined (e.g., focal length ratios, curvature radii) to balance image quality and compactness
Solution Approach 2:
The lens assembly is segmented into five distinct lens elements with specific functions: first element for positive power, second and third for negative power correction, fourth for positive power, and fifth for fine-tuning with inflection points. This segmentation allows each element to contribute specifically to aberration correction without requiring excessive total length
2Length of stationary object
If aperture stop is disposed near the object side to shorten total track length, then telecentric feature is achieved, but field of view is reduced
Solution Approach 1:
The aperture stop position is dynamically optimized within a specific range (0.3f to 0.7f from the object side focal point) to achieve the best balance between telecentric performance and field of view. This dynamic positioning allows the system to adapt between compactness and wide field of view requirements
Solution Approach 2:
The patent defines specific parameter ranges for aperture stop positioning relative to focal length to achieve the desired balance between telecentric feature and field of view, allowing optimization based on specific application requirements
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
This arrangement enhances image quality by correcting aberrations, reducing the total track length, and improving photosensitivity, while maintaining a compact form and reducing sensitivity and distortion.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface
Implementation Method 2
at least one inflection point being provided on the fifth lens element... the inflection point formed on the fifth lens element can effectively reduce the angle at which the light is projected onto the sensor from the off-axis field
Data Source
AI summary
The present invention provides an imaging lens assembly including, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a convex object-side surface; a fifth lens element having a concave image-side surface, at least one inflection point being provided on the fifth lens element; and an aperture stop disposed between an imaged object and the third lens element. Such an arrangement of optical elements can effectively improve the image quality of the system and enable the imaging lens assembly to maintain a compact form. When the aperture stop is disposed near the object side, the telecentric feature is emphasized, resulting in a shorter total track length. When the aperture stop is disposed near the third lens element, the emphasis is on the wide field of view, and such an aperture stop placement helps to effectively reduce the sensitivity of the imaging lens assembly.