Four-Lens Optical Assembly for Compact 3D Sensing
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Solution Overview
Problem
Conventional three-dimensional image capturing technologies face challenges in achieving precision and compactness, especially in portable devices like smartphones, due to limitations in balancing accuracy and size, particularly in applications such as face recognition and augmented reality.
Innovation Solution
An optical lens assembly with four to six lens elements, specifically designed with certain refractive powers and Abbe numbers, is used to optimize the focal lengths and surface shapes, ensuring compactness while maintaining high precision and image quality, particularly in the infrared band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional three-dimensional image capturing technologies are used, then measurement precision can be achieved, but device size becomes large and cannot be applied to portable devices
Solution Approach 1:
The patent uses infrared light in a specific wavelength band (780 nm to 1500 nm) to reduce interference and achieve more accurate measurements while maintaining compactness. This parameter change in wavelength enables both precision and portability
Solution Approach 2:
The optical lens assembly is divided into multiple lens elements (four to six elements) with specific configurations. This segmentation allows each element to be optimized for specific functions, achieving high precision measurement while keeping the overall module compact
2Measurement precision
If the sensing module is made more precise, then measurement accuracy improves, but device complexity and size increase
Solution Approach 1:
By specifying precise parameters for lens elements (Abbe numbers, focal lengths, surface curvatures) and operating in a specific infrared wavelength band, the patent achieves high precision while controlling complexity through standardized design parameters
Solution Approach 2:
The optical lens assembly is designed to perform multiple functions: projecting structured light, capturing reflected light, and enabling three-dimensional measurement. This multi-functionality reduces the need for separate components, thereby controlling complexity while maintaining precision
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 enables high-precision three-dimensional image capturing with improved image quality and compactness, suitable for portable devices, by correcting aberrations and reducing size through careful arrangement of lens elements and refractive powers.
Implementation Method 1
an optical lens assembly, which can be applied to an infrared band... projects light with particular characteristics (such as specific wavelengths and patterns, etc.) onto an object, the light is reflected by the object, and then received by a lens assembly
Data Source
AI summary
An electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has an outside surface being convex in a paraxial region thereof. The second lens element has an inside surface being convex in a paraxial region thereof. The fourth lens element has an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element includes at least one critical point in an off-axis region thereof.