Active Lens Iris Photography Light Control
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Solution Overview
Problem
Existing iris photography devices face challenges in providing a proper amount of light to the iris without causing discomfort or damage, as the amount of light needed varies with the iris's position relative to the device.
Innovation Solution
A device equipped with an active lens having an adjustable refractive index, controlled by a controller, to adjust the light irradiated to the iris based on detected photographing conditions, ensuring optimal light distribution and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source that emits a large amount of light is used to ensure sufficient light reaches the iris, then the light intensity reaching the iris is improved, but when the iris is close to the device, this causes discomfort or damage to the user's eyes
Solution Approach 1:
The patent employs an active lens with dynamically adjustable refractive index that can change in real-time based on the detected distance to the iris. When the iris is close, the lens adjusts to reduce light intensity; when farther away, it increases light intensity. This dynamic adjustment resolves the contradiction by making the light delivery system adaptive rather than fixed.
Solution Approach 2:
The system changes the refractive index parameter of the active lens based on the detected iris position. By adjusting this optical parameter, the system controls the amount of light reaching the iris, ensuring sufficient illumination without causing harmful effects when the iris is in close proximity.
2Measurement precision
If the amount of light irradiated to the iris is increased to obtain a clear image, then the image quality is improved, but the risk of causing discomfort or damage to the user's eyes increases
Solution Approach 1:
The system uses a feedback mechanism where the detected distance to the iris is used to control the active lens adjustment. This closed-loop control ensures that the light intensity is optimized for image quality while automatically preventing excessive illumination that could cause harm, as the system continuously monitors and adjusts based on real-time conditions.
Solution Approach 2:
The active lens provides dynamic control over light delivery, allowing the system to achieve high image quality when needed while automatically reducing intensity when the iris is close, thus resolving the contradiction between image quality and safety.
3Device complexity
If a fixed light source is used to simplify the device structure, then the device complexity is reduced, but the ability to adapt to different iris positions and maintain user comfort is worsened
Solution Approach 1:
Instead of using multiple fixed light sources or complex mechanical adjustment mechanisms, the system changes the optical parameter (refractive index) of a single active lens. This approach maintains relatively simple device structure while achieving high adaptability to different iris positions and lighting conditions.
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 adjusts light irradiation according to the iris's position and ambient conditions, ensuring comfortable and clear iris images, enhancing user authentication processes.
Implementation Method 1
an active lens configured to have an adjustable refractive index to change the generated light passing through the active lens
Data Source
AI summary
A method and device for controlling an irradiating light for photographing an iris is provided. The device includes a light source configured to generate light, an active lens configured to have an adjustable refractive index to change light passing through the active lens, an image capturer configured to capture an image of the iris by using a camera, and a controller configured to control the active lens to change the light passing through the active lens based on distance, motion and ambient light levels.