Compact Optical Lens System Using Aspheric Elements for Miniaturization
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Solution Overview
Problem
Current biometric identification systems in mobile devices face challenges with high manufacturing costs due to complex circuit structures and large volume, making them difficult to miniaturize for compact electronic devices.
Innovation Solution
A compact optical lens system comprising two lens elements with refractive power, including a flat panel, a first lens element with negative refractive power and an aspheric surface, and a second lens element with positive refractive power and aspheric surfaces, optimized for a wide field of view and reduced volume, allowing for effective light collection and image capture at short distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional biometric identification systems using optical imaging principles are used, then identification capability is achieved, but volume becomes too large making it difficult to miniaturize electronic devices
Solution Approach 1:
The optical lens system is divided into only two lens elements with refractive power, separating the optical functions into minimal components while maintaining identification capability. This segmentation reduces the overall system volume compared to traditional multi-element optical systems.
Solution Approach 2:
The patent employs aspheric surfaces on the lens elements, changing the geometric parameters from traditional spherical designs. This parameter change enables better light control and image quality with fewer elements, thereby reducing system volume while maintaining biometric identification reliability.
2Volume of stationary object
If capacitance-based biometric identification systems are used, then volume is reduced, but circuit structure becomes too complex increasing manufacturing cost
Solution Approach 1:
The patent replaces capacitance-based electronic sensing with an optical imaging system. By substituting the mechanical/optical approach for the electronic/capacitive approach, the system achieves compact volume while eliminating complex circuit structures, thereby reducing both physical size and manufacturing complexity.
Solution Approach 2:
The optical system creates an optical copy or image of the biometric feature (such as fingerprint) directly on the image sensor, bypassing the need for complex capacitive sensing circuits. This copying mechanism simplifies the overall system structure while maintaining identification functionality.
3Volume of stationary object
If the distance from object to image plane is reduced for miniaturization, then volume decreases, but light collection capability and image quality deteriorate
Solution Approach 1:
The patent uses aspheric surfaces on the lens elements instead of traditional spherical surfaces. This curvature variation enables better control of light rays across the optical path, maintaining image quality and light collection efficiency even in the reduced OTL distance required for miniaturized devices.
Solution Approach 2:
The optical system is designed with different surface curvatures and refractive powers in different zones of the lens elements. This local quality variation optimizes light control specifically for the reduced OTL configuration, ensuring that image quality is maintained despite the shortened distance from object to image plane.
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 compact optical lens system achieves a wide field of view while minimizing volume and manufacturing complexity, enabling the use in thin electronic products with improved image quality and reduced production sensitivity.
Implementation Method 1
a first lens element with a negative refractive power, at least one of an object-side surface and an image-side surface of the first lens element being aspheric
Implementation Method 2
a second lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric
Implementation Method 3
at least one of an object-side surface and an image-side surface of the first lens element being aspheric; at least one of the object-side surface and the image-side surface of the second lens element being aspheric
Data Source
AI summary
A compact optical lens system includes, in order from the object side to the image side: a flat panel assembly made of glass, a first lens element with a negative refractive power, at least one of an object-side surface and an image-side surface of the first lens element being aspheric, a stop; and a second lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric. Such a system can not only effectively collect light at a large angle, receive a wider range of images and achieve identification effects within very short distances, but also can reduce the distance between an object and the compact optical lens system, reduce the volume effectively and maintain its miniaturization.