Six-Element Image Lens Assembly for Wide Field Aberration Control
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Solution Overview
Problem
Conventional optical lens assemblies struggle to balance image quality, sensitivity, aperture size, volume, and field of view, particularly with advancements in semiconductor processes leading to smaller pixel sizes.
Innovation Solution
An image lens assembly comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces and inflection points, arranged to optimize field of view, image quality, and volume, with optional glass or plastic materials and additives for aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality and correct aberrations, then image quality improves, but device complexity and volume increase
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with specific refractive powers and surface shapes. Each lens element is designed to address specific aberration types, allowing systematic correction of optical defects while maintaining manageable complexity through functional segmentation of the optical system.
Solution Approach 2:
Different lens elements are assigned specific local functions: negative refractive power elements for field of view expansion and specific aberration correction, positive refractive power elements for focal length control, and specific surface shapes (convex, concave, inflection points) positioned at critical locations to correct spherical aberration, coma, and astigmatism locally throughout the optical path.
2Illumination intensity
If the aperture size is increased to improve sensitivity and light gathering, then sensitivity improves, but aberrations increase and image quality deteriorates
Solution Approach 1:
The lens assembly employs specific parameter relationships including focal length ratios (0.3 < f1/f2 < 1.5), axial distance ratios (0.5 < T12/(CT1+CT2) < 2.0), and central thickness ratios (1.5 < (CT2+CT3+CT4+CT5+CT6)/CT1 < 4.0) to optimize the balance between aperture size, sensitivity, and aberration control, allowing large aperture operation while maintaining image quality.
3Area of stationary object
If the field of view is widened to capture more scene, then field of view increases, but aberrations increase and image quality decreases
Solution Approach 1:
The optical system uses segmented lens elements with specific refractive power distributions, where negative refractive power elements are strategically positioned to expand field of view while dedicated elements with specific surface curvatures correct the resulting field curvature and distortion aberrations, maintaining image quality across the wide field.
Solution Approach 2:
Specific lens surfaces are designed with local quality variations including convex, concave, and inflection point configurations at precise positions to correct off-axis aberrations such as coma and astigmatism that become prominent in wide-field applications, ensuring uniform image quality across the entire field of view.
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 enhances image quality, corrects aberrations, and balances field of view, aperture, and volume, while reducing manufacturing costs and stray light, suitable for various imaging applications.
Implementation Method 1
Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has negative refractive power, the second lens element has negative refractive power, the fourth lens element has positive refractive power, and the sixth lens element has negative refractive power.
Data Source
AI summary
An image lens assembly includes six lens elements, and the six lens elements are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof. The second lens element has negative refractive power. At least one surface of at least one of the six lens elements includes at least one inflection point.