Disposable Transistor Unit Checking for Image Forming Apparatus
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Solution Overview
Problem
Existing technologies for determining whether a unit in an image forming apparatus is new or old require high-current switching elements, leading to space and cost issues due to the size and expense of fuses and zener diodes used for this purpose.
Innovation Solution
A unit checking device that employs a transistor destructible by power supplied from the device body, with a control board to determine if the transistor is destroyed, reducing the current capacity and cost requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse or zener diode is used to determine whether a unit is new or old, then the unit checking function is achieved, but the device body size increases and cost increases due to large switching elements and expensive components
Solution Approach 1:
The patent uses a disposable transistor in the unit that is destroyed during the checking process. This disposable component replaces expensive and large switching elements, reducing both cost and size while achieving the same unit checking function.
Solution Approach 2:
The patent extracts the checking function from the main device body by placing a dedicated transistor in the detachable unit itself. This separates the checking mechanism from the device body, allowing the body to use only small control components rather than large high-current switching elements.
2Reliability
If a fuse or zener diode is used to determine whether a unit is new or old, then the unit checking function is achieved, but the unit cost increases due to expensive components
Solution Approach 1:
The patent replaces expensive components (fuses and zener diodes) with a cheap disposable transistor in the unit. This significantly reduces unit cost while maintaining the reliability of the checking function.
Solution Approach 2:
The patent uses a simple transistor circuit that can be easily manufactured and copied in mass production, replacing complex and expensive component assemblies with a simple, reproducible design.
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 allows for efficient determination of a unit's new or old status using a smaller, less expensive transistor, saving space and reducing costs by integrating the necessary components and controlling the base current for heat generation.
Implementation Method 1
a transistor for checking provided in the unit and destructed by power supplied from the device body
Data Source
AI summary
A unit checking device is provided which checks whether a unit detachably provided to a device body is new or old. The unit checking device includes a transistor for checking provided in the unit and configured to be destructed by power supplied from the device body; and an inspection device provided in the device body and configured to determine whether or not the transistor is destructed by applying a voltage to the transistor.