Optical Imaging Lens Surface Sag Control for Assembly Yield
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Solution Overview
Problem
The challenge in developing optical imaging lenses for portable electronic devices is to achieve higher pixel and imaging quality while maintaining good assembly yield, as increasing the number of lens elements decreases assembly yield and requires complex optical design optimization.
Innovation Solution
The optical imaging lens design involves controlling the convex or concave shape of lens elements to increase system focal length and resolution, with specific surface shapes and refracting powers for each lens element, satisfying certain inequalities to maintain imaging quality and reduce lens length, thereby extending the field of view and improving assembly yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve resolution and imaging quality, then imaging quality is improved, but assembly yield significantly declines
Solution Approach 1:
The patent changes the refractive power parameters of lens elements, specifically making the fourth lens element have negative refractive power and the fifth lens element have positive refractive power. This parameter change allows achieving high imaging quality with fewer lens elements, thereby maintaining assembly yield while improving resolution
Solution Approach 2:
The patent uses composite optical design combining lens elements with different refractive powers and materials. The optical imaging lens includes multiple lens elements with specific refractive indices and Abbe numbers, creating a composite optical system that achieves high imaging quality without requiring excessive number of elements
2Manufacturing precision
If the number of lens elements is increased to achieve higher pixel and imaging quality, then resolution is improved, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by setting specific refractive power signs for different lens elements (negative for fourth element, positive for fifth element), which simplifies the overall optical design while achieving high resolution. This approach reduces design complexity compared to using more elements
3Manufacturing precision
If the aperture is reduced below 1.8 to achieve higher pixel and imaging quality, then imaging quality is improved, but field of view is reduced
Solution Approach 1:
The patent changes the refractive power parameters of lens elements to achieve a balance between aperture and field of view. By making the fourth lens element negative and fifth positive, the system can maintain Fno below 1.8 while achieving half field of view above 38 degrees, resolving the contradiction between aperture size and field of view
4Length of moving object
If the lens system length is reduced to 7 mm to achieve compact design, then portability is improved, but imaging quality deteriorates
Solution Approach 1:
The patent uses parameter changes in refractive powers to achieve compact lens design with length around 7 mm while maintaining high imaging quality. The negative fourth element and positive fifth element configuration enables short focal length with high resolution, resolving the contradiction between compactness and imaging quality
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 approach effectively shortens the optical imaging lens length, enhances imaging quality, and increases the field of view while maintaining high assembly yield and cost-effectiveness.
Implementation Method 1
The first, second, third, fourth, fifth, sixth, and seventh lens elements may each have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens may include a first, a second, a third, a fourth, a fifth, a sixth and a seventh lens element positioned in an order from an object side to an image side along an optical axis. Through designing concave and/or convex surface of the lens elements, the optical imaging lens may have improved imaging quality and improved assembly yield while the optical imaging lens may satisfy (|Sag51/ER51|+|Sag52/ER52|)/2≤20.000%, wherein a Sag of an optical boundary of the object-side surface of the fifth lens element is represented by Sag51, a Sag of an optical boundary of the image-side surface of the fifth lens element is represented by Sag52, an effective radius of the object-side surface of the fifth lens element is represented by ER51, and an effective radius of the image-side surface of the fifth lens element is represented by ER52.