Rotating Filter Mechanism for Iris Recognition Camera Modules
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Solution Overview
Problem
Camera modules in mobile devices face challenges in capturing infrared light within the 800-850 nm wavelength range necessary for iris recognition, as existing filters often block this spectrum to maintain image quality.
Innovation Solution
A camera module design incorporating a rotating bearing plate with interchangeable visible and infrared light filters, allowing manual or motorized switching between filters to align the appropriate filter with the lens for capturing either visible or infrared light, including a filter within the 800-850 nm range for iris recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a filter is added to block ultraviolet and infrared light, then image quality is improved, but infrared light capture capability deteriorates
Solution Approach 1:
The patent employs a rotatable bearing plate with filters that can be rotated to different positions. The bearing plate includes a first filter position with a visible light filter for normal photography, and a second filter position with an infrared light filter for iris recognition. This dynamic switching mechanism allows the camera module to adapt between different lighting conditions and functional requirements, resolving the contradiction between maintaining image quality and capturing infrared light.
Solution Approach 2:
The patent divides the filter system into separate, interchangeable filter elements mounted on a rotatable bearing plate. Instead of using a single fixed filter, the system segments the filtering function into multiple specialized filters (visible light filter and infrared light filter) that can be selectively positioned. This segmentation allows each filter to be optimized for its specific function while enabling the system to switch between functions as needed.
2Manufacturing precision
If a single filter is used for visible light, then image quality is maintained, but multi-functionality deteriorates
Solution Approach 1:
The patent creates a universal filter system where a single camera module can perform multiple functions through the rotatable bearing plate mechanism. The bearing plate holds both a visible light filter and an infrared light filter, allowing the module to function as both a standard camera for visible light photography and an iris recognition device for infrared light capture. This multi-functional design resolves the contradiction by enabling one device to serve multiple purposes without compromising the performance of either 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
Enables effective iris recognition functionality while maintaining image quality by selectively allowing infrared light within the 800-850 nm range, enhancing the camera module's versatility and functionality.
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
capturing infrared light of 800-850 nm wavelength is necessary for the iris recognition feature to function
Implementation Method 3
The image sensor senses light passing through the visible light filter 40 and the infrared light filter 50 and converts the optical signals into electrical signals
Data Source
AI summary
Camera module with switchable light filters includes a lens module, a bearing rotating device, a visible light filter, and an infrared light filter. The bearing rotating device includes a rotating shaft, at least one guiding stick, and a bearing plate. The rotating bearing plate holds the two filters and defines an arcuated guiding slot. The circle center of the arcuated guiding slot is the rotating shaft. A visible light filter and an infrared light filter are switchable, their movement being governed by the guiding stick and the guiding slot, to respective alignment with an optical axis of the lens module. The camera module can rotate the bearing plate to switch the infrared filter for the visible filter where the acquisition of infrared light is required.