Dual Lens Iris Camera Module with Divided Sensor
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Solution Overview
Problem
Portable electronic devices require separate camera modules for general imaging and iris recognition, increasing space occupancy due to the need for both infrared and visible light capabilities.
Innovation Solution
An iris scanning camera module with a dual lens system and a divided image sensor, where one lens module is used for general imaging and the other for iris recognition, sharing a single housing with an optical filter that blocks or passes infrared light accordingly, allowing both functions to be performed within a single camera module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate camera modules are used for general imaging and iris recognition, then both functions can be performed with dedicated infrared and visible light capabilities, but the space occupied by camera modules increases
Solution Approach 1:
The patent combines general imaging and iris recognition functions into a single camera module by integrating two lens modules (first lens module for general imaging, second lens module for iris recognition) and a divided image sensor with different pixel arrays (color pixel array for general imaging, black-and-white pixel array for iris recognition) within one housing, thereby reducing the overall space occupied while maintaining both functional capabilities
Solution Approach 2:
The image sensor is segmented into distinct regions: a color pixel array region for general imaging and a black-and-white pixel array region for iris recognition. This segmentation allows each region to be optimized for its specific function while sharing the same physical housing and optical path structure, resolving the space contradiction
2Area of stationary object
If a single camera module is used for both general imaging and iris recognition, then space occupancy is reduced, but the device must handle both infrared and visible light simultaneously which complicates the optical system
Solution Approach 1:
The optical filter is divided into different regions with different optical properties: an infrared blocking filter region corresponding to the color pixel array for visible light imaging, and an infrared pass filter region corresponding to the black-and-white pixel array for infrared iris recognition. This local differentiation allows the single optical system to handle both infrared and visible light appropriately for each function
Solution Approach 2:
The divided optical filter acts as an intermediary element that selectively manages infrared and visible light paths. By positioning the filter between the lens modules and image sensor, it mediates the optical signals before they reach the pixel arrays, enabling the single camera module to distinguish between infrared and visible light functions
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 both general imaging and iris recognition imaging using a single camera module, reducing the physical space required in portable electronic devices while maintaining image quality.
Implementation Method 1
The optical filter may be divided into an infrared blocking filter region and an infrared pass filter region
Implementation Method 2
The infrared pass filter region can be aligned with the black-and-white pixel array of the image sensor
Implementation Method 3
an image sensor configured to convert light passing through the first lens module and the second lens module into an image
Data Source
AI summary
An iris scanning camera module includes a housing having an internal space, and a first lens module and a second lens module inside the internal space. The first lens module and the second lens module have optical axes parallel to each other. An image sensor is configured to convert light passing through the first lens module and the second lens module into an image. The image sensor is divided into a region including a color pixel array and as another region including a black-and-white pixel array. The color pixel array is aligned in an optical axis direction of the first lens module, and the black-and-white pixel array is aligned in an optical axis direction of the second lens module.