Position Detecting Device Non-Detection Area for Jig Misdetection
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Solution Overview
Problem
In light curtain generating devices, adjusting the emitting direction of the light curtain based on reflection from a jig on a projection surface can be challenging due to difficulties in distinguishing reflected light from the jig and the projection surface, leading to potential misdetection.
Innovation Solution
A control method for a position detecting device that emits detection light to a specific range of a jig on a display surface, adjusts the detection light to prevent detection as reflected from an obstacle, and sets a non-detection area to avoid misinterpretation of the jig as an obstacle, using a processor to manage the light emitting and detecting sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the detection light is emitted to a jig disposed on a display surface for adjusting the emitting direction, then the emitting direction of the light curtain can be adjusted, but the reflected light by the jig is reflected on the projection surface causing misdetection of the pointer position
Solution Approach 1:
The detection system is divided into two separate functional areas: a detection region for pointer position detection and a non-detection region containing the adjustment jig. This segmentation allows the system to distinguish between light reflected from the pointer and light reflected from the jig, eliminating misdetection while maintaining adjustment capability
Solution Approach 2:
Different regions of the display surface are assigned different functional qualities: the region containing the jig is designated as a non-detection area where pointer detection is disabled, while other regions maintain normal detection functionality. This local differentiation resolves the contradiction by applying detection suppression only where necessary
2Reliability
If the detecting section detects all reflected light on the display surface, then all obstacles can be detected, but the jig for adjustment is misidentified as an obstacle
Solution Approach 1:
Before obstacle detection is performed, the system preliminarily designates the region containing the adjustment jig as a non-detection area. This preliminary action prevents the jig from being misidentified as an obstacle while maintaining the detection of actual obstacles in other regions, thus improving both reliability and 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
This method effectively adjusts the detection light to minimize misdetection by setting a non-detection area for the jig, allowing accurate detection of pointer positions without interference from obstacles, thus improving the precision of the light curtain adjustment.
Implementation Method 1
a detecting section configured to detect reflected light by the pointer of the detection light
Data Source
AI summary
A control method for a position detecting device including a first adjusting step of emitting detection light to a jig for adjustment disposed on a screen and adjusting the detection light to first detection light such that the detection light is emitted to a specific range of the jig for adjustment and a step of setting, in a state in which the detection light has been adjusted to the first detection light, a region including the jig for adjustment as a non-detection area where a detecting section does not detect the detection light as the reflected light from an obstacle, wherein the position detecting device including a light emitting section configured to emit the detection light and the detecting section.