Aspheric Lens Array for Compact Fingerprint Imaging
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Solution Overview
Problem
Conventional mobile terminals with image scanning capabilities are bulky, time-consuming, and prone to image distortion, failing to meet requirements for compact size and high image quality, especially when attempting to capture complete images using sequential scanning processes with lens linear arrays of micro-lenses.
Innovation Solution
An image capturing array system comprising at least two image lens units with aspheric lens elements and a stationary object, where each unit captures a part of the image simultaneously, allowing for a single scanning process to obtain the desired image range, and featuring a compact size and large field of view through optimized lens configurations and arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lens linear array of micro-lenses is used to reduce device size, then the mobile terminal becomes more compact, but the image capturing process becomes time-consuming and requires multiple sequential scanning processes
Solution Approach 1:
The imaging system is divided into multiple independent image lens units arranged in an array, where each lens unit captures a different portion of the object simultaneously. This segmentation allows parallel processing of multiple image regions, eliminating the need for sequential scanning and reducing total capture time while maintaining compact device dimensions.
Solution Approach 2:
The patent transitions from a single-lens sequential scanning approach to a multi-lens parallel array configuration. By adding the spatial dimension of multiple lens units working simultaneously, the system captures complete object images in a single operation rather than requiring time-consuming sequential movements, thus resolving the time loss issue while maintaining compactness.
2Volume of moving object
If a lens linear array of micro-lenses is used to reduce device size, then the mobile terminal becomes more compact, but image distortion becomes excessive
Solution Approach 1:
Each image lens unit is designed with customized optical parameters including specific focal lengths, aperture ratios, and aspheric coefficients tailored to its position in the array. This local optimization ensures that each lens unit captures its specific field of view with minimal distortion, and the combined results maintain high overall image quality while preserving the compact array structure.
Solution Approach 2:
The patent employs aspheric lens surfaces with specific aspheric coefficients (k1, k2 values) for each lens element to correct optical aberrations and minimize distortion. By carefully controlling parameters such as focal length, aperture ratio, and aspheric shape for each position in the lens array, the system achieves both compactness and high image quality without excessive distortion.
3Volume of moving object
If sequential scanning processes are used to capture complete images, then device size can be reduced, but the probability of misidentification is increased
Solution Approach 1:
The lens array is pre-configured with multiple image lens units positioned to simultaneously capture different portions of the object in a single operation. This preliminary arrangement eliminates the need for sequential scanning movements, ensuring that complete image information is captured in one operation, thereby maintaining high identification accuracy while keeping the device compact.
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 solution reduces the time and cost of image capture while enhancing accuracy and image quality, enabling a broader captured range and improved manufacturing efficiency, while maintaining identification degree and image clarity.
Implementation Method 1
Each of the image lens units includes at least one lens element with refractive power, and an object-side surface and an image-side surface of the lens element are aspheric
Data Source
AI summary
An image capturing array system includes, in order from an object side to an image side, at least two image lens units and at least one image sensor disposed on an image plane of each of the image lens units. Each of the image lens units includes at least one lens element with refractive power, an object-side surface and an image-side surface of the lens element are aspheric, and an object is relatively stationary with respect to the in lens units during an image capturing process.