Background-Suppressed Light Sensor With Critical Spacing Feedback
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Solution Overview
Problem
Light sensing devices lack direct feedback on the correct setting of sensing depth and maintenance of critical spacing region between the sensing depth and background, requiring external documentation for minimum distance verification, which complicates secure object detection and background suppression.
Innovation Solution
A light sensing device with a display unit featuring multiple regions to indicate the set sensing depth, critical spacing region, and background, providing direct feedback on object detection within these regions, using a rotary potentiometer or button for setting the sensing depth and an evaluation unit to determine object distance, ensuring secure detection and background suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensing depth is set using a potentiometer or teaching button without direct feedback, then the device structure remains simple, but the user cannot verify whether the critical spacing region is properly maintained between the sensing depth and background
Solution Approach 1:
The patent implements a display unit with multiple display regions that provide direct visual feedback to the user. The first display region shows the set sensing depth relative to maximum sensing depth, while the second display region indicates whether objects are present in the critical spacing region. This feedback mechanism allows users to verify proper setting and maintain reliable operation without external documentation.
Solution Approach 2:
The display unit is segmented into multiple distinct display regions, each serving a specific function. The first display region displays sensing depth information, while the second display region displays critical spacing region status. This segmentation allows complex information to be presented in an organized, easily interpretable manner that reduces user cognitive load.
2Ease of operation
If external documentation is required to determine minimum spacing requirements, then the device remains simple to manufacture, but the ease of operation deteriorates as users must refer to data sheets and perform manual measurements
Solution Approach 1:
The light sensing device performs self-verification by automatically displaying whether objects are present in the critical spacing region. The evaluation unit continuously monitors object positions and the display unit provides real-time feedback, eliminating the need for users to consult external documentation or perform manual measurements to verify proper operation.
Solution Approach 2:
The display unit provides preliminary information about the critical spacing region status before objects may interfere with detection. By continuously displaying whether objects are present in the critical spacing region, the system allows users to adjust settings proactively rather than reacting to detection failures after they occur.
3Reliability
If no indication is provided when objects are in the critical spacing region, then the device operates simply, but detection reliability deteriorates as undetected objects may interfere with secure object recognition
Solution Approach 1:
The evaluation unit continuously monitors object positions and provides feedback through the display unit when objects are detected in the critical spacing region. The second display region specifically indicates the presence of objects that may interfere with secure detection, allowing users to take corrective action to maintain reliable operation.
4Measurement precision
If the maximum sensing depth is exceeded without indication, then the setting process remains simple, but measurement precision deteriorates as the actual detection range becomes unknown
Solution Approach 1:
The first display region provides continuous visual feedback showing the set sensing depth relative to the maximum sensing depth capability of the device. This allows users to verify that the sensing depth is properly set within operational limits, ensuring measurement precision without requiring external documentation.
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
Enables direct and intuitive feedback on sensing depth settings and detection conditions, eliminating the need for external evaluation devices and documentation, ensuring secure detection by clearly indicating object presence within the correct spacing region and avoiding interference from background objects.
Implementation Method 1
a light transmitter (12) and a light receiver (14)
Data Source
AI summary
A light sensing device having background suppression includes: a light transmitter, a light receiver, an evaluation unit for determining the spacing between the light sensing device and an object in a detection zone of the light sensing device, and a setting element for setting a sensing depth within which an object should be detected. A critical spacing region is defined between a set sensing depth and a background in dependence on the set sensing depth. A signal output outputs a signal if an object is detected within the set sensing depth and a display unit displays whether an object is present within the sensing depth. The set sensing depth can be displayed in relation to a maximum sensing depth of the light sensing device in a first display region and a second display region indicates if an object is located in the critical spacing region.