Imaging Cover Glass Microstructure to Reduce Diffraction Flare
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Solution Overview
Problem
In the use of chip scale package (CSP) for solid-state imaging apparatuses, light reflection inside the glass cover causes image quality issues such as diffraction flare, which conventional methods struggle to address effectively.
Innovation Solution
A solid-state imaging apparatus with a translucent member featuring a two-dimensional array of protruded portions on its surface, optimized in height, pitch, and packaging ratio, to minimize light diffraction and improve light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a translucent member (glass cover) is attached on the substrate in CSP packaging, then the packaging density and integration are improved, but light reflection and diffraction inside the glass cover deteriorate image quality
Solution Approach 1:
The invention applies local quality by creating protruded portions at specific locations on the glass cover surface. These protruded portions are strategically positioned to locally modify light reflection characteristics without affecting the entire glass cover structure, thereby reducing diffraction flare while maintaining the overall integrity and transparency of the glass cover for CSP packaging
Solution Approach 2:
The invention converts the harmful light reflection and diffraction phenomenon into a beneficial effect. By designing protruded portions on the glass cover, the previously harmful reflected light is redirected to follow the optical path toward the photoelectric conversion portion, transforming diffraction flare into useful light signal that improves image quality
2Object-affected harmful factors
If conventional methods are used to control diffraction reflection, then some reduction in diffraction may be achieved, but the image becomes blurred
Solution Approach 1:
The invention applies parameter changes by carefully controlling the geometric parameters of the protruded portions, including height (0.1-1.0 μm), diameter (0.1-0.5 μm), and pitch (0.2-0.8 μm). These parameter optimizations ensure that light reflection is reduced without causing image blur, achieving both diffraction control and image clarity simultaneously
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 protruded portions reduce the negative impact of light diffraction, enhancing image quality by increasing the ratio of non-diffracted light transmission and maintaining desirable camera characteristics.
Implementation Method 1
reflection diffraction inside the glass cover becomes a problem... the reflection diffraction inside the glass cover is reflected on an image... the negative influence of the reflection diffraction inside the translucent member on an image can be reduced
Implementation Method 2
reflection of light inside the glass cover becomes a problem... phenomenon in which the reflection diffraction inside the glass cover is reflected on an image
Data Source
AI summary
There is provided a solid-state imaging apparatus that allows to suitably dispose a translucent member on a substrate including a photoelectric conversion portion. The solid-state imaging apparatus of the present disclosure has: a substrate that includes a photoelectric conversion portion; a lens that is disposed on the substrate; and a translucent member that is disposed on the lens. The translucent member includes a plurality of protruded portions that are disposed in a two-dimensional array form on an upper surface of the translucent member.