Camera Module Switchable Filter Tray for Iris Recognition
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Solution Overview
Problem
Conventional camera modules struggle to seamlessly integrate iris recognition functionality while maintaining image quality by effectively filtering out ultraviolet and infrared light, as they often require specific wavelengths for iris recognition, which existing filters cannot accommodate.
Innovation Solution
A camera module design that includes a movable tray and gear system allowing for the alternative placement of visible light and infrared filters over the lens, enabling the module to switch between filters to capture images or perform iris recognition by covering the lens with either a visible light filter or an infrared filter as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a visible light filter is used to maintain image quality, then ultraviolet and infrared light are filtered out, but infrared light necessary for iris recognition is blocked
Solution Approach 1:
The patent implements a movable tray mechanism that can dynamically switch between different filter configurations. The tray moves along a guide rail to position either the visible light filter or the infrared filter in the optical path, allowing the system to adapt between image capture mode and iris recognition mode as needed
Solution Approach 2:
The filtering function is segmented into separate visible light filter and infrared filter components mounted on the movable tray. This segmentation allows each filter to be independently optimized for its specific function while enabling selective deployment through the movable tray mechanism
2Adaptability or versatility
If an infrared filter is used to enable iris recognition, then infrared light is captured, but visible light filtering is compromised affecting image quality
Solution Approach 1:
The movable tray mechanism enables dynamic switching between filter configurations. When iris recognition is needed, the tray positions the infrared filter in the optical path while removing the visible light filter from the path, allowing infrared capture without compromising visible light image quality when not in use
3Adaptability or versatility
If both visible light and infrared filters are always in place, then both functions are supported, but the device complexity increases
Solution Approach 1:
Instead of having both filters permanently in place, the movable tray mechanism allows dynamic reconfiguration. The tray moves to bring the appropriate filter into the optical path only when needed, reducing the permanent structural complexity while maintaining dual-function capability
Solution Approach 2:
The movable tray mechanism serves multiple functions: it holds both filters, provides the switching mechanism between them, and integrates with the camera module's existing structure. This universal component enables dual functionality without proportionally increasing overall system complexity
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
Enables the camera module to maintain image quality by selectively filtering out unwanted light and allowing necessary infrared light for iris recognition, enhancing the device's functionality and versatility.
Implementation Method 1
A camera module may have filters against ultraviolet and infrared light to avoid the ultraviolet and infrared light affecting the image quality
Implementation Method 2
captures infrared light of 800-850 nm wavelengths which is necessary for the iris recognition feature to function
Data Source
AI summary
Camera module with switchable light filters includes a lens, a body, a movable tray, a first filter, a second filter, a gear and a protective cover. The lens is disposed in the body. The body defines a first through hole corresponding to the lens and includes a first surface. The movable tray is positioned on the first surface and is used for receiving the first filter and the second filter. The gear is arranged on the first surface by a rotating shaft, the gear is configured to engage with the movable tray to switch the first filter and the second filter. The protective cover is disposed on the body and partially covers the gear.