Cartridge Mounting Detection Circuit for Printers
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Solution Overview
Problem
Existing printing material cartridge mounting detection techniques face issues such as bit errors due to hot swapping and require complex wiring for individual cartridge detection, leading to user inconvenience and potential damage from unintended short circuits.
Innovation Solution
A printing apparatus with a holder for multiple cartridges, featuring a mounting detection circuit and resistive elements configured to produce a detection voltage that identifies the mounted state without hot swapping risks, and includes overvoltage detection to prevent damage from short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mounting detection is performed by communicating with a storage device of the cartridge, then individual cartridge identification is enabled, but bit errors occur due to hot swapping stress on the semiconductor element
Solution Approach 1:
The patent divides the detection function into two separate components: a storage device for individual cartridge identification and a separate mounting detection circuit for detecting whether the cartridge is mounted. This segmentation allows the storage device to be disconnected during mounting detection, preventing hot swapping stress and bit errors while maintaining individual cartridge identification capability.
Solution Approach 2:
The patent introduces a separate mounting detection circuit as an intermediary component that detects cartridge mounting status independently of the storage device. This intermediary circuit uses a detection voltage generated by a resistive element rather than communicating with the storage device, thereby preventing direct stress on the semiconductor element during mounting operations.
2Reliability
If the CPU does not access the storage device during cartridge replacement, then bit errors are prevented, but mounting detection cannot be displayed on the display panel
Solution Approach 1:
The patent segments the detection functions by providing a separate mounting detection circuit that operates independently from the storage device communication. This allows the mounting detection circuit to continuously monitor and display cartridge mounting status on the display panel without requiring CPU access to the storage device, maintaining both reliability and user convenience.
Solution Approach 2:
The mounting detection circuit performs self-service by autonomously detecting mounting status through the detection voltage and directly controlling the display panel indication, without requiring CPU intervention or storage device access. This enables continuous mounting status display while preventing bit errors.
3Measurement precision
If wiring lines are individually installed between respective cartridges and mounting detection circuits, then individual cartridge detection is enabled, but device complexity increases
Solution Approach 1:
The patent merges the mounting detection functions of multiple cartridges into a single common mounting detection circuit. The circuit receives detection voltages from multiple cartridges through common wiring and processes them collectively, enabling individual cartridge detection while significantly reducing wiring complexity compared to having separate detection circuits for each cartridge.
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 reliable and user-friendly mounting detection of multiple cartridges without bit errors and reduces the risk of damage from unintended short circuits, ensuring accurate state display and safe operation.
Implementation Method 1
resistive elements configured to produce a detection voltage that identifies the mounted state
Implementation Method 2
a mounting detection circuit for detecting mounted states of the printing material cartridges in the holder
Data Source
AI summary
A printing apparatus includes: a holder in which a printing material cartridge set is mounted; and a mounting detection circuit for detecting mounted states of printing material cartridges in the holder. Each of the N printing material cartridges includes a storage device for storing information regarding a printing material which is contained, an electric device for mounting detection, a terminal for the storage device, and a terminal for the electric device. The electric devices of the N printing material cartridges are configured so that a detection voltage becomes equal to or greater than a threshold voltage set in advance when the N printing material cartridges are all mounted in the holder.