Infrared Screen Position Detection Using 2D Matrix Sensors
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Solution Overview
Problem
Current systems for detecting the position of objects on a plane in a space face challenges in accuracy and complexity, particularly when multiple objects pass through an infrared screen, leading to difficulties in distinguishing between objects and determining their precise positions.
Innovation Solution
A position detection system comprising an infrared screen generation unit, a reflected light detection unit, and a position specifying unit, which selectively detects and specifies the reflection of infrared rays on the infrared screen, allowing for accurate detection of multiple objects without the need for high-precision sensors, and includes a real screen positioned close to the infrared screen to minimize detection gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of infrared rays irradiation means and infrared sensors is increased to improve detection accuracy, then detection accuracy is improved, but device complexity and difficulty of setting increase
Solution Approach 1:
The patent transitions from a 1D linear sensor array to a 2D matrix arrangement of infrared sensors. This dimensional change allows the system to detect objects in both x and y directions simultaneously, improving detection accuracy without proportionally increasing the total number of sensors. The matrix structure creates multiple detection paths that can identify object positions more precisely while maintaining a manageable sensor count.
Solution Approach 2:
The detection area is divided into multiple segments corresponding to individual sensor elements in the matrix arrangement. Each sensor detects infrared rays from specific directional ranges, and the combination of signals from multiple segmented sensors provides comprehensive detection accuracy. This segmentation allows the system to achieve high precision without requiring a single overly complex sensor.
2Measurement precision
If the gaps between infrared rays are narrowed to improve detection accuracy, then detection accuracy is improved, but one ball may be detected by multiple sensors leading to recognition errors
Solution Approach 1:
The patent uses a 2D matrix sensor arrangement with sensors positioned at intersections of x-direction and y-direction infrared rays. When an object blocks infrared rays, the system detects the specific sensor positions in both dimensions that are affected. By calculating the intersection point of the blocked rays in the matrix coordinate system, the system can precisely determine object position without requiring extremely narrow gaps between rays, thus avoiding multiple sensor activations that would cause recognition errors.
Solution Approach 2:
The patent introduces a coordinate calculation mechanism that acts as an intermediary between sensor detections and object identification. Instead of directly mapping sensor activations to objects, the system calculates the intersection coordinates of blocked infrared rays in the matrix system. This intermediary calculation process resolves ambiguities when multiple sensors are activated, allowing the system to accurately determine the true object position even with narrower ray gaps.
3Productivity
If a plurality of balls pass through the infrared screen simultaneously, then the system should detect all balls, but it becomes difficult to specify the passing position of each ball
Solution Approach 1:
The patent employs a 2D matrix sensor arrangement where sensors are positioned at the intersections of x-direction and y-direction infrared rays. When multiple objects pass through simultaneously, each object blocks specific combinations of infrared rays in both dimensions. The system detects the pattern of blocked sensors in the matrix and calculates the intersection coordinates for each object by analyzing which x-direction and y-direction rays are blocked. This dimensional approach allows the system to distinguish and precisely locate multiple objects even when they pass through at the same time, maintaining both high detection speed and position specification 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
This system enables accurate and efficient detection of object positions, even when multiple objects pass through the infrared screen, improving collision detection accuracy in games and reducing the complexity of sensor arrangement, thereby enhancing gameplay experience.
Implementation Method 1
an infrared screen generation unit for generating a planar infrared screen
Implementation Method 2
a reflected light detection unit for selectively detecting a reflection of infrared rays on the infrared screen caused by a given object to be detected that passes through the infrared screen
Data Source
AI summary
Positions of a plurality of objects in a space are detected. A position of reflected light of an object passing through an infrared screen is specified by analyzing an image obtained by selectively imaging the infrared rays. When the infrared screen is formed in front the display, reflected light is only caused just in front of the display. When the infrared rays are selectively imaged, a picture displayed with visible light is separated from reflected light in the infrared region, and only the reflected light can be imaged. A position of the reflected light on the display can be specified by a publicly known image analysis technique.