Cemented Lens Boundary Arc Design for Ghost Suppression
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Solution Overview
Problem
Existing cemented lenses face challenges in minimizing the protrusion or recess amount at the boundary portion between the lens surface and the flange surface, which affects the size and optical performance of imaging lenses, particularly in miniaturization efforts.
Innovation Solution
A cemented lens design where the object-side and image-side lenses have specific convex or concave surfaces with flange surfaces and boundary portions, featuring a cross-section with multiple circular arc shapes along the optical axis, allowing for reduced protrusion or recess amounts by optimizing the distance between the actual and virtual apex positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protrusion or recess is formed in the boundary portion between the cemented lens surface and the flange surface to suppress ghost reflection, then the optical performance is improved, but the protrusion amount or recess amount increases
Solution Approach 1:
The boundary portion cross-section is divided into multiple circular arc shapes with different radii of curvature instead of using a single circular arc. This segmentation allows different regions of the boundary to have different curvatures, enabling effective ghost suppression while controlling the protrusion or recess amount within acceptable limits
Solution Approach 2:
The invention changes the geometric parameters of the boundary portion by using multiple circular arc shapes with specifically controlled radii of curvature. By adjusting these parameters, the patent achieves effective ghost reflection suppression while maintaining the protrusion or recess amount within a manageable range that does not excessively increase the lens size
2Reliability
If the imaging element size is increased to accommodate more pixels, then the imaging performance is improved, but the overall device size increases
Solution Approach 1:
The boundary portion is designed with multiple circular arc shapes, utilizing curved geometries to optimize the optical path and suppress ghost reflections. This curved design allows for compact lens structure that accommodates larger imaging elements without proportionally increasing the overall device volume
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 design effectively reduces the protrusion or recess amounts, improving the thickness deviation ratio and optical performance, such as reducing aberrations like chromatic aberration, while maintaining compact size.
Implementation Method 1
an object-side lens and an image-side lens are cemented together with an adhesive layer
Implementation Method 2
the light reflected by the cover of the imaging element and directed to the boundary portion is reflected so as not to go toward the imaging element
Data Source
AI summary
In a cemented lens, an object-side lens includes a concave first lens surface, a first flange surface, and a first boundary portion between the first lens surface and the first flange surface. An image-side lens includes a convex second lens surface, a second flange surface, and a second boundary portion between the second lens surface and the second flange surface. A cross section including an optical axis of the first boundary portion includes a plurality of circular arc shapes. If the cross section has a circular arc shape with a single radius and a position of an apex of the circular arc shape is a virtual position, a distance between an actual apex position of the cross section and the first flange surface in a direction of the optical axis is shorter than that between the virtual position and the first flange surface in the direction of the optical axis.