Liquid Lens Iris Camera with Rotatable Angle Adjustment
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Solution Overview
Problem
Current iris recognition systems require users to position their eyes accurately for both lenses or use two lenses, which is inconvenient and limits rapid recognition.
Innovation Solution
An iris recognition camera with a liquid lens having an adjustable curvature and rotatable angle, allowing for single-lens recognition of both eyes by adjusting the curvature and rotational angle to align with the user's irises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lens is used for iris recognition, then device complexity is reduced, but the ability to recognize both eyes simultaneously is compromised
Solution Approach 1:
The patent employs a liquid lens with dynamically adjustable curvature and a rotatable lens assembly that can change its orientation angle. This dynamic capability allows a single lens to adapt its optical parameters to capture iris images from both eyes sequentially, resolving the contradiction between using a simple single-lens structure and maintaining the ability to recognize both eyes.
Solution Approach 2:
The liquid lens changes its focal length by adjusting the curvature of its surface, and the lens assembly changes its orientation angle. These parameter changes enable the single lens to optimize its capture for each eye independently, allowing versatile iris recognition functionality without requiring multiple fixed lenses.
2Measurement precision
If optical-axis focusing is implemented, then iris recognition accuracy is improved, but the system requires precise alignment that reduces ease of operation
Solution Approach 1:
The liquid lens provides dynamic focusing capability that can adjust its curvature in real-time. Combined with the rotatable lens assembly that can orient toward either eye, this dynamic system automatically achieves optical-axis focusing for the target eye without requiring the user to manually position their eyes precisely, thus maintaining high accuracy while improving ease of operation.
Solution Approach 2:
The system performs automatic focusing and orientation adjustment through the liquid lens and rotatable mechanism. The camera control unit automatically controls the curvature adjustment and rotational angle without user intervention, allowing the system to self-align for optimal iris capture while the user simply needs to face the camera generally.
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 convenient and rapid iris recognition of both eyes with a single lens, improving user experience and security authentication efficiency.
Implementation Method 1
a liquid lens, the curvature of the front surface of which is adjustable
Implementation Method 2
an angle change unit rotatable so as to change the angle of the liquid lens in an optical-axis direction
Data Source
AI summary
One embodiment of an iris recognition camera can comprise: a liquid lens capable of adjusting the curvature of a lens front surface; a first adjusting part for adjusting the curvature of the front surface, of the liquid lens, to which the light is incident; an angle changing part rotating so as to change the angle in the direction of an optical axis of the liquid lens; and a second adjusting part for adjusting the rotational angle of the angle changing part.