Three-Piece Infrared Lens for 3D Depth Detection
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Solution Overview
Problem
Current infrared receiving and induction lens groups for game machines, made of plastic, suffer from poor material transparency and temperature-related issues, affecting depth detection accuracy and failing to meet the requirements for 3D game focusing.
Innovation Solution
A three-piece infrared single wavelength lens system comprising a stop, a first lens element with positive refractive power and aspheric surfaces, a second lens element with positive refractive power and aspheric surfaces, and a third lens element with positive refractive power and aspheric surfaces, optimized to achieve a wide field of view and improved resolution through specific focal length and curvature ratios, reducing aberration and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic lens elements are used to reduce cost, then manufacturing cost is reduced, but material transparency deteriorates and temperature stability worsens
Solution Approach 1:
The lens system is divided into three separate lens elements instead of using a single plastic lens, allowing each element to be optimized for specific optical functions while maintaining cost-effectiveness through selective material usage
Solution Approach 2:
The patent employs a composite lens structure where plastic and glass materials are combined in specific configurations. This composite approach leverages the cost advantages of plastic while incorporating glass elements to improve transparency and thermal stability, directly resolving the contradiction between manufacturing cost and reliability
2Area of stationary object
If wide-angle lens design is used to broaden induction scope, then field of view is improved, but depth detection precision deteriorates
Solution Approach 1:
Different regions of the lens system are assigned different optical properties through the three-element design. Each lens element has specific curvature and refractive power optimized for its local function, with the first element capturing wide field of view and subsequent elements refining depth precision in specific zones
Solution Approach 2:
The patent employs aspheric surfaces on the lens elements with specifically optimized curvature radii. The curvature parameters (R1, R2, R3, R4) are carefully selected to balance wide-angle performance with depth detection precision, using curved surfaces to correct aberrations that would otherwise degrade measurement precision
3Manufacturing precision
If aspheric surfaces are used to reduce aberration, then image quality is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of making all surfaces of all lens elements aspheric, the patent applies aspheric surfaces selectively to specific surfaces (object-side and image-side surfaces of certain elements) where they provide the most benefit. This partial application reduces manufacturing complexity while still achieving significant aberration reduction and improved image quality
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 provides enhanced image sensing and depth detection accuracy, suitable for 3D game applications, with improved resolution and reduced aberration, while maintaining cost-effectiveness by using plastic or glass lens elements.
Implementation Method 1
a first 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
Data Source
AI summary
A three-piece infrared single wavelength 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 with a positive refractive power, and a third lens element with a positive refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.5<f1/f23<1.0. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.