Lens Rib Surface Roughness for Optical Axis Alignment
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Solution Overview
Problem
The increasing number of lenses in camera modules for portable electronic devices has made it difficult to align optical axes, leading to unintended light reflection and flare or ghost phenomena in photographed images, due to the decreased size of camera modules.
Innovation Solution
A lens design featuring a rib structure with varying surface roughness areas on its object-side and image-side surfaces, including inclined surfaces and protrusions, which helps in aligning optical axes and preventing light reflection by diffusing unintended reflected light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to improve camera module performance, then image quality is improved, but alignment of optical axes becomes more difficult
Solution Approach 1:
A rib structure with specific surface roughness patterns is introduced as an intermediary element between adjacent lenses. This rib acts as a mediator to facilitate optical axis alignment by providing a reference surface with distinct roughness zones that guide precise positioning during assembly, thereby resolving the alignment difficulty caused by increased lens count.
Solution Approach 2:
The rib surface is designed with non-uniform local quality through varying surface roughness in different areas. The first area has a first surface roughness while the second area has a second surface roughness different from the first, creating localized tactile and optical references that enable precise optical axis alignment without affecting the overall lens performance.
2Adaptability or versatility
If the number of lenses is increased in a reduced camera module size, then camera functionality is improved, but unintended light reflection increases causing flare or ghost phenomena
Solution Approach 1:
Different areas of the rib surface are assigned different surface roughness characteristics. The first area with first surface roughness and the second area with second surface roughness create varied light interaction zones that diffuse unintended reflected light, preventing concentrated flare or ghost phenomena while maintaining the enhanced camera functionality provided by multiple lenses.
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 lens design effectively prevents light reflection and facilitates easy measurement of concentricity, improving image quality by aligning optical axes and reducing flare phenomena.
Implementation Method 1
a rib extending along a circumference of at least a portion of the optical portion... the second area includes inclined surfaces
Implementation Method 2
an optical portion refracting light
Data Source
AI summary
A lens includes an optical portion refracting light, a rib extending along a circumference of at least a portion of the optical portion, a first area and a second area of an object-side surface of the rib, wherein the first area has a first surface roughness and the second area has a second surface roughness less rough than the first surface roughness, and a third area and a fourth area of an image-side surface of the rib, wherein the third area has a third surface roughness and the fourth area has a fourth surface roughness less rough than the third surface roughness, wherein the second area includes inclined surfaces.