Light Shielding Wall on Optical Filter for Imaging Substrate
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Solution Overview
Problem
Conventional imaging apparatuses with glass substrates face challenges in preventing warping due to temperature fluctuations, which can lead to distorted image planes and degraded image quality, while also struggling to effectively shield stray light.
Innovation Solution
An imaging apparatus with a light shielding wall formed on an optical filter, using either ultraviolet curable or thermosetting resin, that shields stray light entering the light receiving region, and a flexible material to prevent dust mixing, along with a step on the transparent substrate to restrict optical filter movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding film is formed on the substrate by heat treatment, then stray light can be shielded, but the substrate may warp due to heat treatment
Solution Approach 1:
The patent introduces an optical filter as an intermediary component between the transparent substrate and the solid-state imaging element. The light shielding wall is formed on this optical filter rather than directly on the substrate, allowing stray light to be blocked without subjecting the substrate to heat treatment. This mediator approach resolves the contradiction by decoupling the light shielding function from the substrate structure.
Solution Approach 2:
The patent segments the light shielding function from the substrate by forming it on a separate optical filter component. This segmentation allows the substrate to maintain its transparency and dimensional stability while the optical filter carries the light shielding wall that blocks stray light, thus preventing substrate warping while still achieving stray light shielding.
2Shape
If no light shielding film is provided, then substrate warping is prevented, but stray light cannot be shielded
Solution Approach 1:
The optical filter serves as a mediator that carries the light shielding wall function without requiring the substrate to have this function. This allows the substrate to remain flat and transparent while the optical filter blocks stray light, resolving the contradiction between maintaining substrate flatness and shielding stray light.
Solution Approach 2:
The light shielding function is extracted from the substrate and placed on the optical filter. This extraction allows the substrate to maintain its primary function of providing structural support and transparency without the added complexity and potential warping associated with integrated light shielding films.
3Stability of the object's composition
If glass substrate is used to prevent warping, then thermal stability is improved, but stray light shielding becomes difficult
Solution Approach 1:
The patent segments the thermal stability function (handled by the glass substrate) from the stray light shielding function (handled by the optical filter with light shielding wall). This segmentation allows each component to optimize its respective function without compromising the other, resolving the contradiction between thermal stability and stray light shielding.
Solution Approach 2:
The optical filter acts as an intermediary that provides stray light shielding without interfering with the thermal stability properties of the glass substrate. This mediator approach allows the substrate to maintain its thermal stability while the optical filter handles the stray light blocking function.
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 solution effectively prevents warping of the substrate while shielding stray light, maintaining image quality and preventing dust contamination, thus enhancing the imaging apparatus's performance.
Implementation Method 1
the light shielding wall may include a cured ultraviolet curable resin
Implementation Method 2
the light shielding wall may include a cured thermosetting resin
Data Source
AI summary
In an imaging apparatus provided with a substrate having transparency, warping of the substrate is prevented while stray light is shielded. The imaging apparatus includes a sensor chip, a transparent substrate, a light shielding wall, and an optical filter. In this imaging apparatus, a solid-state imaging element is provided in a light receiving region of the sensor chip. Furthermore, in the imaging apparatus, the transparent substrate is equipped on an outer edge portion of the sensor chip. In addition, in the imaging apparatus, the light shielding wall shields light that passes through the transparent substrate and enters the front light receiving region. The light shielding wall is formed on the optical filter.