Imaging Device Light-Shielding Area Geometry for Flare Prevention
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Solution Overview
Problem
Imaging devices face challenges in preventing flare due to inadequate light-shielding mechanisms, where existing solutions either intercept essential light rays or allow flare from reflected light, leading to suboptimal image quality.
Innovation Solution
A light-shielding area is implemented between a cover glass and an optical member, featuring a light-transmitting area cut on the optical member's edge, with specific geometric conditions to ensure effective light shielding without intercepting essential light rays, thereby preventing flare and improving image centering and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding area is provided between the cover glass and imaging element to prevent flare, then flare prevention is improved, but essential light rays may be intercepted causing image quality degradation
Solution Approach 1:
The light-shielding area is designed with non-uniform properties: it provides light shielding in specific regions (where flare originates from reflected light paths) while maintaining light transmission in other regions (where essential imaging light rays pass through). This localized differentiation resolves the contradiction by making different parts of the light-shielding area serve different functions.
Solution Approach 2:
The light-shielding area acts as an intermediary structure between the cover glass and imaging element. It mediates the conflict between flare prevention and light transmission by selectively blocking harmful reflected light while allowing essential imaging light to pass through to the imaging element.
2Object-affected harmful factors
If the light-shielding area is positioned closer to the imaging element to improve flare prevention, then flare reduction is enhanced, but the risk of intercepting essential light rays increases
Solution Approach 1:
The light-shielding area employs local quality differentiation by providing light shielding only in specific angular and spatial regions where flare originates, while maintaining openness in other regions. This allows the structure to be positioned close to the imaging element for effective flare prevention without intercepting essential light rays that travel through different paths.
3Object-affected harmful factors
If a complete light-shielding area is used to maximize flare prevention, then flare is effectively blocked, but image centering and bonding quality deteriorate
Solution Approach 1:
The light-shielding area uses local quality differentiation by providing light shielding in specific regions while leaving other regions open. This selective shielding blocks flare from reflected light paths while preserving unobstructed views of critical features (such as bonding interfaces and centering marks) needed for accurate image centering and bonding quality assessment.
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 effectively shields external light rays, prevents flare, and enhances image centering and bonding quality by optimizing the light-shielding area's geometry and transmittance, ensuring improved image quality and accuracy.
Implementation Method 1
a light-shielding area between a cover glass for imaging element and an optical member arranged adjacently to the cover glass
Implementation Method 2
the light-shielding area includes a light-transmitting area which is formed by cutting a part of the light-shielding area
Data Source
AI summary
An imaging device having a light-shielding area between a cover glass for imaging element and an optical member arranged adjacent to the cover glass, the light-shielding area having a light-transmitting area which is formed by a part of the light-shielding area on an edge of the optical member being cut off so that one or more corners on the boundary between an image area of the imaging element and the outside of the image area are locatable from the object side, and the following conditions (1) and (2) are satisfied:0.3≦a/IH≦1.5 (1)a1≦a≦a2′ (2)where, a1=IH−D tan θ1, a2′ denotes the smallest value of the following values a2, a3, and a4, a2=2b−IH−D tan θ2, a3=b−(D/2)×tan θ3, a4=b−X.