Five-Lens Infrared Optical System for 3D Depth Detection
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Solution Overview
Problem
Current infrared receiving and induction lens groups for game machines are inadequate for 3D game depth precise induction due to poor material transparency and sensitivity to temperature changes, leading to inaccurate focal length and inability to meet 3D game depth detection requirements.
Innovation Solution
A five-piece infrared single focus lens system with specific refractive power and aspheric surface configurations, including a stop and five lens elements with precise focal lengths and curvature relationships, designed to provide a wide field of view, high resolution, and reduced distortion, while maintaining miniaturization and stability across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic material is used for infrared receiving and induction lens groups to reduce cost, then manufacturing cost is reduced, but material transparency deteriorates and temperature stability worsens
Solution Approach 1:
The patent uses glass material instead of plastic to achieve both transparency and temperature stability. The glass lens elements maintain optical performance across varying temperatures while providing the necessary transparency for infrared wavelength reception, resolving the contradiction between cost-effective manufacturing and reliable performance.
2Device complexity
If conventional lens groups are used for 2D plane games, then device complexity is low, but measurement precision deteriorates for 3D depth detection
Solution Approach 1:
The patent divides the lens system into five separate lens elements with specific refractive power configurations (+-++- or +++--). This segmentation allows each element to contribute to the overall optical performance, enabling precise depth detection for 3D games while maintaining a manageable device structure.
Solution Approach 2:
The patent transitions from 2D plane game detection to 3D depth detection by configuring the five lens elements to capture depth information. The specific arrangement and refractive powers of the lens elements enable the system to detect depth in the third dimension, improving measurement precision for 3D applications.
3Area of stationary object
If lens groups are designed for wide-angle infrared reception, then field of view is improved, but distortion increases
Solution Approach 1:
The patent employs aspheric surfaces on the lens elements to control and reduce distortion while maintaining a wide field of view. The aspheric configurations allow the lens group to capture a broader angular range of infrared wavelengths without introducing excessive image distortion, resolving the contradiction between field of view and shape accuracy.
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 system achieves a wide field of view, high resolution, and reduced distortion, effectively addressing the limitations of existing lens groups by maintaining accurate focal length and improving image quality and depth detection in 3D applications.
Implementation Method 1
a first lens element with a positive refractive power having an object-side surface being convex near an optical axis, at least one of the object-side surface and an image-side surface of the first lens element being aspheric
Implementation Method 2
at least one of the object-side surface and an image-side surface of the first lens element being aspheric
Implementation Method 3
a fifth lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being concave near an optical axis, at least one of the object-side surface and an image-side surface of the fifth lens element being aspheric and provided with at least one inflection point
Data Source
AI summary
A five-piece infrared single focus lens system includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power, a second lens element, a third lens element with a positive refractive power, a fourth lens element, a fifth lens element, wherein a focal length of the first lens element is f1, a focal length of the third lens element is f3, a central thickness of the first lens element along an optical axis is CT1, a central thickness of the third lens element along the optical axis is CT3, a radius of curvature of an object-side surface of the first lens element is R1, a radius of curvature of an object-side surface of the third lens element is R5, satisfying the relation: −1.60<(f1×CT1×R1)/(f3×CT3×R5)<2.43. Such a system has a wide field of view, high resolution, short length and less distortion.