Camera Module Dust Trap and IRCF Adhesion Design
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Solution Overview
Problem
Camera modules with VCMs are prone to defects due to foreign objects, such as dust or stains, on the image sensor, which cause black spots or stains in captured images, as they cannot effectively filter out all wavelengths of light, including infrared, leading to image quality issues.
Innovation Solution
A camera module design incorporating an Infrared Cut Filter (IRCF) mounted on a base with an adhesive member that includes a foreign object collection section, and a dust trap formed at the periphery of the image sensor to prevent foreign objects from reaching the active region, using a combination of adhesive agents like double-sided tape or epoxy, and a dam structure to trap dust and particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an IRCF is interposed between the image sensor and the lens to interrupt infrared light, then image quality in visible light region is improved, but foreign objects may still drop on the image sensor causing black spot defects
Solution Approach 1:
A dust trap member is introduced as an intermediary component between the lens and the image sensor. This dust trap member captures foreign objects in the air flow path before they can reach the image sensor, thereby preventing black spot defects while maintaining the IRCF's function of blocking infrared light
Solution Approach 2:
The space between the lens and image sensor is segmented into functional zones: the IRCF handles infrared light filtering, while the dust trap member handles foreign object capture. This segmentation allows each component to specialize in its specific function without interfering with the other
2Reliability
If a dust trap is formed at the periphery of the image sensor to collect foreign objects, then the active region is protected from pollution, but the device structure becomes more complex
Solution Approach 1:
The dust trap member is merged with the existing base structure that supports the IRCF. By integrating the dust trap function into the base rather than adding a completely separate component, the structure becomes more compact and less complex while still providing effective foreign object capture
Solution Approach 2:
The base structure is designed to serve multiple functions: it supports the IRCF for infrared filtering and simultaneously incorporates the dust trap member for foreign object capture. This multi-functionality reduces the need for additional separate components, simplifying the overall device structure
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 reduces the occurrence of black spot defects by trapping foreign objects and preventing them from polluting the image sensor's active region, thereby enhancing image quality and reliability.
Implementation Method 1
an adhesive member fixing the IRCF to the base
Implementation Method 2
the adhesive agent may include an adhesive section adhering the IRCF to the base, and a foreign object collection section free from contact with the IRCF
Implementation Method 3
a dam structure to trap dust and particles
Data Source
AI summary
Exemplary embodiments of a camera module are proposed, the camera module including a PCB (Printed Circuit Board) mounted with an image sensor, a base installed at an upper surface of the PCB and formed with a window at a position corresponding to that of the image sensor, an IRCF (Infrared Cut Filter) installed at an upper surface of the base, and an adhesive member fixing the IRCF to the base.