Six-Lens Optical Module Aberration Correction
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Solution Overview
Problem
Traditional optical image capturing systems face challenges in achieving compact size and low cost while maintaining high imaging quality, especially when correcting chromatic aberration at small F-numbers and large wide-angle applications, as they require multiple lens elements, leading to increased length and cost.
Innovation Solution
A thin optical image capture module is designed using a combination of six lens elements with specific refractive powers and aspheric surfaces, including a first lens with positive refractive power, a second lens with refractive power, a third and fourth lens with refractive power, a fifth lens with a concave image-side surface, and a sixth lens with negative refractive power and a convex image-side surface, optimized to reduce the total length and improve imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sphere lapping glass lens elements are used to correct chromatic aberration, then imaging quality is improved, but the system length increases and complexity increases
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive power distributions. Each lens element (first through sixth) has designated positive or negative refractive powers that work together to correct chromatic aberration while maintaining a compact overall structure, eliminating the need for traditional sphere lapping glass lenses
Solution Approach 2:
Different regions of the lens elements have optimized surface characteristics. Specifically, the sixth lens element has an aspheric image-side surface with inflection points between the optical axis and peripheral surface, and the fifth lens element has a concave image-side surface adjacent to the optical axis. These localized surface quality variations enable effective aberration correction in a compact design
2Reliability
If more lens elements are combined to improve imaging quality, then imaging quality is improved, but the total length of the optical system increases
Solution Approach 1:
The patent optimizes specific parameter ratios to achieve compact design with six lens elements. Key parameters include: |S12H/AD|*100 within 1-5% for the sixth lens element height ratio, AD/f (aperture diameter to focal length) within 0.3-0.6, HFOV/f (half field of view to focal length) within 5-15 degrees, and STL/FL (distance from aperture stop to sixth lens element divided by focal length) within 0.4-0.6. These parameter optimizations enable effective aberration correction while maintaining compact system length
3Reliability
If aspheric plastic lens elements are used to improve imaging quality, then imaging quality is improved, but more lens elements are needed resulting in increased system length
Solution Approach 1:
The optical system uses a composite approach combining plastic lens elements with aspheric surfaces and specific refractive power distributions. The sixth lens element features an aspheric surface with inflection points, and the fifth lens element has a concave image-side surface. This composite design achieves superior aberration correction comparable to glass elements but in a more compact form factor suitable for mobile devices
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 effectively shortens the optical lens assembly, enhances imaging quality, and maintains compactness by fine compensation for astigmatism, distortion, and spherical aberration, meeting the requirements of small electronic products.
Implementation Method 1
The first lens element has positive refractive power and a convex object-side surface adjacent to the optical axis. The second lens element has refractive power adjacent to the optical axis. The third lens element has refractive power adjacent to the optical axis. The fourth lens element has refractive power adjacent to the optical axis. The fifth lens element has refractive power and a concave image-side surface adjacent to the optical axis. The sixth lens element has negative refractive power and a convex image-side surface adjacent to the optical axis
Data Source
AI summary
The present disclosure illustrates an optical image capture module comprising an optical lens assembly, an aperture stop and an image plane. The optical lens assembly in order from an object side toward an image side comprising: a first lens element, having positive refractive power and a convex object-side surface adjacent to the optical axis; a second lens element, a third lens element and a fourth lens element which have refractive power adjacent to the optical axis; a fifth lens element having refractive power and a concave image-side surface adjacent to the optical axis; a sixth lens element having negative refractive power and a convex surface image-side surface adjacent to the optical axis, at least one of the object-side surface and image-side surface of the sixth lens element being aspheric and having at least one inflection point located between the optical axis and the peripheral surface.