Imaging Lens Module Aberration Control via Aspheric Curvature
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Solution Overview
Problem
Conventional imaging lens modules for thin and wide-angle applications, such as in mobile devices, fail to meet the requirements of reduced thickness and increased resolving power, particularly with three-lens configurations.
Innovation Solution
An imaging lens module comprising a sequential arrangement of first, second, and third optical lenses with specific refractive powers and aspheric surfaces, along with a constant-aperture diaphragm placed between the first and second lenses, satisfying optical conditions that enhance the module's performance by reducing aberrations and increasing the maximum viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional three-lens configuration is used, then the device structure is simple, but the resolving power is insufficient and the viewing angle is limited
Solution Approach 1:
The patent changes the optical parameters of the lens system by introducing a fourth lens with specific refractive power (negative) and aspheric coefficients, transforming the conventional three-lens configuration into a four-lens system that achieves wider viewing angle and higher resolving power while maintaining compact structure
Solution Approach 2:
The patent employs composite optical design by combining lenses with different refractive powers and aspheric coefficients in a single optical system, where each lens element has specific optical properties that work together to achieve the desired imaging performance
2Length of moving object
If the lens module is made thinner, then the device thickness is reduced, but the viewing angle and resolving power deteriorate
Solution Approach 1:
The patent utilizes aspheric surfaces on multiple lens elements with specific aspheric coefficients to correct optical aberrations and expand the viewing angle, achieving improved resolving power without increasing the overall lens module thickness
Solution Approach 2:
The patent optimizes the optical parameters including refractive indices, aspheric coefficients, and lens spacing to achieve a balance between thinness and imaging performance, allowing the lens module to be thin while maintaining wide viewing angle and high resolving power
3Length of moving object
If the lens module is made thinner, then the device thickness is reduced, but the maximum viewing angle is limited
Solution Approach 1:
The patent employs aspheric surfaces on the fourth lens and adjusts its aspheric coefficient to expand the maximum viewing angle while maintaining a thin lens module structure, correcting optical aberrations that would otherwise limit the viewing angle
Solution Approach 2:
The patent changes the optical parameters of the lens system, particularly introducing a fourth lens with specific refractive power and aspheric coefficients, to achieve a wider maximum viewing angle without increasing the overall thickness of the lens module
4Reliability
If off-centre deviations occur, then the lens module is more tolerant of manufacturing variations, but aberrations increase
Solution Approach 1:
The patent introduces a fourth lens with specific aspheric coefficients and refractive power that compensates for optical aberrations caused by off-centre deviations, improving the overall optical performance and reducing harmful aberrations while maintaining tolerance to manufacturing variations
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 results in a smaller, thinner lens module with improved resolving power and a larger maximum viewing angle, while minimizing aberrations caused by off-centre deviations, thus addressing the limitations of prior art.
Implementation Method 1
The first optical lens has a positive refractive power near the optical axis. The second optical lens has a negative refractive power near the optical axis. The third optical lens has a positive refractive power near the optical axis.
Data Source
AI summary
An imaging lens module includes first, second and third optical lenses that are arranged sequentially from an object side to an image side along an optical axis, and a constant-aperture diaphragm disposed between the first and second optical lenses. The first optical lens has a positive refractive power, and the second optical lens has a negative refractive power. The third optical lens has a positive refractive power and has an object-side surface and an image-side surface, At least one of which has at least an inflection point. The imaging lens module satisfies: 0.8TL/Dg1.1, in which, TL is a length from an imaging plane to the object-side surface of the first optical lens, and Dg is a length of a diagonal line of a maximum viewing angle on the imaging plane.