Three-Element Optical Lens Assembly Compact 3D Sensing
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Solution Overview
Problem
The challenge is to design a compact optical lens assembly with excellent optical quality for portable electronic devices, particularly for 3D sensing technologies, which requires high resolution and compactness while maintaining good optical performance.
Innovation Solution
The optical lens assembly consists of a first, second, and third lens element, with specific concave-convex surface designs and refracting power conditions, ensuring a thickness ratio that allows for a compact and low-cost configuration while maintaining good optical quality, including aspheric surfaces and carefully optimized parameters such as EFL/BFL ≥ 3.500.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical lens assembly uses more lens elements to improve optical quality, then the optical performance is improved, but the device size and complexity increase
Solution Approach 1:
The patent applies local quality by designing specific concave and convex surface regions on each lens element. The first lens element has a concave periphery region on its light incident surface, the second lens element has a concave optical axis region on its light incident surface, and the third lens element has a concave periphery region on its light exit surface. These localized surface variations optimize light path control and aberration correction without requiring additional lens elements, thus maintaining compact device complexity while improving optical quality.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the thickness of the first lens element relative to the air gaps between lens elements (thickness ≥ sum of air gaps), and by optimizing the EFL/BFL ratio (≥3.500). These parameter adjustments enable effective aberration control and compact design, achieving high optical quality with only three lens elements rather than requiring more complex multi-element assemblies.
2Length of moving object
If the optical lens assembly is made compact to meet portable device requirements, then the device size is reduced, but the optical quality and resolution may deteriorate
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional multi-element axial arrangements to a compact three-element design with optimized surface curvatures. By using concave-convex surface combinations and controlling the thickness of the first lens element relative to air gaps, the patent achieves effective aberration correction in a shortened axial direction, maintaining high resolution while reducing overall length for portable applications.
Solution Approach 2:
The patent uses parameter changes by establishing the EFL/BFL ratio ≥3.500 and controlling the first lens element thickness to be greater than or equal to the sum of air gaps. These parameter optimizations enable the compact design to maintain adequate optical path length and focal characteristics, ensuring high resolution and optical quality despite the reduced overall length.
3Ease of manufacture
If the optical lens assembly uses simpler lens designs to reduce cost, then the manufacturing cost is reduced, but the optical quality and aberration control worsen
Solution Approach 1:
The patent applies local quality by implementing specific concave surface regions on the first and third lens elements and a concave optical axis region on the second lens element. These localized surface features are designed to correct specific aberrations (spherical aberration, coma, astigmatism) while maintaining relatively simple overall lens structures that can be manufactured cost-effectively, avoiding the need for complex multi-element assemblies.
Solution Approach 2:
The patent employs parameter changes by optimizing the thickness of the first lens element relative to air gaps and setting the EFL/BFL ratio ≥3.500. These parameter adjustments enable effective aberration control with a simple three-element design, achieving good optical quality without requiring expensive complex lens systems or additional corrective elements.
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 achieves compactness and low cost while providing excellent optical quality, effectively reducing aberrations and maintaining image quality across different wavelengths, thus addressing the need for high-resolution 3D sensing applications in portable devices.
Implementation Method 1
Each of the first lens element to the third lens element includes a light exit surface facing the light exit side and a light incident surface facing the light incident side. The second lens element has positive refracting power...
Data Source
AI summary
An optical lens assembly including a first lens element, a second lens element and a third lens element is provided. A periphery region of a light incident surface of the first lens element is concave. The second lens element has positive refracting power, and an optical axis region of a light incident surface of the second lens element is concave. A periphery region of a light exit surface of the third lens element is concave, and an optical axis region of a light incident surface of the third lens element is convex. The lens elements of the optical lens assembly only include the first lens element to the third lens element, and a thickness of the first lens element along an optical axis is greater than or equal to a sum of two air gaps from the first lens element to the third lens element along the optical axis.