Fuse Status Detection Using Preliminary Current to Prevent Short Circuit Errors
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Solution Overview
Problem
Conventional image forming apparatuses face reliability issues in determining whether a consumable unit is new or old due to potential short circuits at the connection points between the circuit boards, leading to incorrect identification of consumable units as old even after abnormal circumstances have been resolved.
Innovation Solution
The apparatus employs a method involving first and second electrical currents to determine the presence of abnormal circumstances at the connection points, ensuring the fuse does not inadvertently melt and blow, and only applies a current capable of making the fuse melt and blow when no abnormalities are detected, thereby accurately distinguishing between new and old consumable units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical current is applied to detect fuse melting state to determine consumable unit status, then new/old determination can be made, but false positives occur due to short circuits at connection points
Solution Approach 1:
The patent applies preliminary action by detecting the electrical potential at the second terminal before applying full current to the fuse. This preliminary detection identifies abnormal circumstances (short circuits) at connection points before the main determination process, preventing false positives in consumable unit status determination.
Solution Approach 2:
The patent uses an intermediary approach by introducing a detection step that measures electrical potential at the second terminal as an intermediate indicator. This intermediary measurement serves as a preliminary check to identify connection abnormalities without immediately concluding about consumable unit status, thereby preventing erroneous determinations.
2Ease of operation
If fuse melting detection is used to distinguish new and old consumable units, then unit status can be determined, but abnormal circumstances at connections cause incorrect identification
Solution Approach 1:
The patent performs preliminary action by checking the electrical potential at the second terminal before proceeding to fuse melting detection. This preliminary check ensures that no abnormal circumstances exist at connection points, thereby preventing incorrect identification of consumable units as old when they are actually new.
3Reliability
If electrical current is applied to make fuse melt and blow to determine new unit, then consumable unit status can be confirmed, but short circuits cause unintended fuse melting
Solution Approach 1:
The patent applies preliminary action by detecting electrical potential at the second terminal before applying current to the fuse. This preliminary detection identifies potential short circuits at connection points in advance, preventing unintended fuse melting while still allowing intentional fuse melting to occur when connections are normal.
Solution Approach 2:
The patent implements preliminary anti-action by using the electrical potential detection at the second terminal to counteract the risk of unintended fuse melting. The detection mechanism identifies abnormal circumstances before full current is applied, effectively preventing harmful fuse melting that would occur due to connection short circuits.
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 approach enhances the reliability of determining the status of consumable units by preventing false positives and ensuring accurate identification of consumable units, reducing errors in determining their new or old status.
Implementation Method 1
an electrical conductor placed around at least the second terminal
Data Source
AI summary
The apparatus includes first and second terminals, an electrical conductor placed around at least the second terminal, a first current applying unit, an abnormal circumstances determining unit, a second current applying unit, and an informing unit. The first current applying unit applies current between the first terminal and the second terminal. The abnormal circumstances determining unit determines whether there is an abnormal circumstance at the connection between the apparatus and the unit side circuit, under the condition that the current is applied by the first current applying unit. The second current applying unit applies current between the first terminal and the second terminal, in case that the abnormal circumstances determining unit determined that there is not an abnormal circumstance of the connection. The informing unit informs the abnormal circumstance of the connection, in case that the abnormal circumstances determining unit determined that there is the abnormal circumstance of the connection.