Series Sensor Control via Voltage Switching
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Solution Overview
Problem
The increasing number of sensors in image forming apparatuses leads to a proliferation of cables and connectors, hindering downsizing and increasing costs due to complex management and the need for sophisticated configurations to differentiate between sensors with the same configuration.
Innovation Solution
A sensor control apparatus that connects multiple sensors in series, using a control unit with switches to apply different voltages to each sensor, allowing independent detection operations without complex control circuits, and using the same interface for all sensors regardless of their position in the series connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of sensors are arranged in the image forming apparatus, then the detection capability is improved, but the number of cables and connectors increases, leading to increased wiring space and device complexity
Solution Approach 1:
Multiple sensors are connected in series to share a common signal line, merging multiple detection functions into a single wiring path. This eliminates the need for separate cables and connectors for each sensor, thereby reducing wiring space and connector space while maintaining the ability to detect multiple parameters
Solution Approach 2:
A single signal line serves multiple sensors in series, making the wiring system universal rather than dedicated to each sensor. The same cable and connector infrastructure supports all sensors, reducing the overall number of components needed and simplifying the wiring architecture
2Loss of information
If sensors with different resistance values are used to differentiate detection results, then sensor identification is improved, but the number of sensor kinds increases, leading to increased management cost
Solution Approach 1:
Sensors are differentiated by changing their resistance values while maintaining the same basic sensor structure and model. This allows the control unit to identify which sensor detected a signal based on the resistance value in the series circuit, enabling sensor differentiation without creating multiple sensor kinds or variants
Solution Approach 2:
Each sensor in the series connection has a unique resistance value assigned to it, creating a local distinguishing characteristic. This allows the system to identify the specific sensor location and status based on the electrical properties of that particular sensor position in the series circuit
3Ease of manufacture
If sensors with the same configuration are connected in series, then component management is simplified, but it becomes difficult to determine which sensor a detection result is based on
Solution Approach 1:
While sensors have the same physical configuration for ease of management, each sensor is assigned a unique resistance value as an electrical parameter. The control unit uses these resistance values to determine which sensor in the series connection produced a detection result, thereby maintaining sensor correspondence information without complicating the physical sensor design
4Measurement precision
If sophisticated control configurations are used to enable independent sensor operation, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The sensors in the series connection automatically provide their own identification through their unique resistance values. When a sensor detects a signal, the control unit determines which sensor it is by measuring the resistance value in the circuit, eliminating the need for additional identification circuits, address encoding, or sophisticated control mechanisms
Solution Approach 2:
The patent replaces complex control mechanisms (such as packet communication or address-based identification) with a simple electrical resistance-based identification system. The resistance values serve as natural identifiers that the control unit can detect through electrical measurements, substituting mechanical or software-based identification systems with an electrical property-based system
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 solution reduces the number of cables and connectors, simplifies component management, and allows sensors with the same configuration to operate independently, reducing costs and complexity while maintaining accurate detection results.
Implementation Method 1
a control unit with switches to apply different voltages to each sensor, allowing independent detection operations
Data Source
AI summary
A sensor control apparatus includes a control unit, a plurality of sensors connected in series to the control unit. Each of the plurality of sensors includes a detector configured to perform a detection operation based on a first voltage applied from the control unit, a first switch provided on an application path for applying a voltage, a second switch provided on a supply path for supplying the voltage applied from the control unit to a sensor connected in a subsequent stage, and a conduction control unit. The control unit brings the first switch into conduction and cut off the second switch in a case where the voltage on the application path is the first voltage, and cuts off the first switch and bring the second switch into conduction in a case where the voltage on the application path is a second voltage.