Segmented Iris Recognition Lens with Reflective Zones
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Solution Overview
Problem
Conventional iris recognition lens systems are bulky and uncomfortable due to their long length, which is exacerbated by the need for a long focal length to capture accurate iris images, making them unsuitable for thin smartphones.
Innovation Solution
The iris recognition lens system incorporates a single lens with multiple reflecting and transmitting areas, optimizing the geometry to reduce the total optical track length while increasing the focal length, allowing for a compact and high-definition imaging solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens with a long focal length is used to capture accurate iris images, then the imaging accuracy is improved, but the lens system length increases making it bulky and uncomfortable
Solution Approach 1:
The single lens is segmented into multiple functional areas: a first reflecting area, a first transmitting area, a second reflecting area, and a second transmitting area. This segmentation allows light to follow different optical paths within the same lens component, effectively increasing the focal length without proportionally increasing the physical lens length.
Solution Approach 2:
The patent utilizes multi-dimensional light path routing by combining reflection and transmission modes within the lens. Light can reflect off the first reflecting area, transmit through the first transmitting area, reflect again at the second reflecting area, and transmit through the second transmitting area. This dimensional routing of light paths enables a longer effective focal length within a compact physical form factor.
2Length of stationary object
If a lens with a short focal length is used to reduce lens system length, then the lens system becomes compact, but the eye must be placed close to the lens making it uncomfortable
Solution Approach 1:
The lens is divided into multiple functional zones with different optical properties. The reflecting areas and transmitting areas are strategically positioned to create extended optical paths, allowing the system to achieve long focal length characteristics while maintaining a short physical lens length, thereby improving both compactness and imaging comfort.
Solution Approach 2:
The reflecting areas act as intermediaries that redirect light paths within the lens system. By introducing these reflective surfaces, the patent extends the effective optical path length without increasing the physical distance between the lens and the imaging sensor, enabling comfortable imaging at appropriate eye-to-lens distances.
3Measurement precision
If multiple lenses are used to achieve long focal length, then the imaging accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple optical functions (reflection, transmission, focusing) into a single lens component. Instead of using multiple separate lenses or optical elements, the invention integrates these functions within one lens by creating different optical paths through reflecting and transmitting areas, thereby reducing device complexity while maintaining imaging accuracy.
Solution Approach 2:
The single lens performs multiple optical functions simultaneously: it reflects light at the first and second reflecting areas, transmits light through the first and second transmitting areas, and focuses the combined light paths to achieve the desired focal length. This multi-functionality reduces the number of components needed while maintaining imaging performance.
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
This design results in a smaller, high-performance iris recognition lens system that is applicable to small electronics like smartphones, providing improved imaging comfort and accuracy with a focal length significantly greater than the lens length, thus overcoming the bulkiness and discomfort issues of previous systems.
Implementation Method 1
A front part of the first lens includes a reflecting area in a central portion... The reflecting area in the front part of the first lens may be concave in a direction toward the object
Implementation Method 2
A front part of the first lens includes a reflecting area in a central portion and a transmitting area in a circumferential portion
Data Source
AI summary
An iris recognition lens system including a first lens and a second lens disposed on an optical axis and sequentially from an object to take an image of an iris and a pupil. A front part of the first lens includes a reflecting area in a central portion and a transmitting area in a circumferential portion. A rear part of the first lens includes a concave transmitting area in a central portion and a reflecting area in a circumferential portion. The second lens is disposed at a rear of the transmitting area in the central portion of the rear part of the first lens. A plurality of reflecting areas and a plurality of transmitting areas are provided in a single lens in order to reduce the length of the lens and increase a focal length, thereby reducing the length of the entire iris recognition lens system.