CRUM Unit Terminal Reduction via Clock Signal Conversion
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Solution Overview
Problem
The existing methods for implementing a customer replacement unit monitor (CRUM) in image forming apparatuses require a large number of connecting terminals, which increases the size and cost of the units and complicates the use of existing universal ICs due to modifications in clock signal generation protocols.
Innovation Solution
A CRUM unit that uses an existing universal IC by converting first clock signals into second clock signals compatible with I2C protocols, reducing the number of required terminals and eliminating the need for a power terminal, thereby simplifying the interface and reducing the unit's size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power terminal is added to provide power to the CRUM unit, then the CRUM unit can operate independently, but the number of terminals and interfaces increases, leading to increased size and cost
Solution Approach 1:
The clock signal line is designed to serve dual purposes: data synchronization during active communication and power supply during idle periods. This multi-functionality eliminates the need for a separate power terminal while maintaining CRUM unit operation independence.
Solution Approach 2:
The power supply function is merged with the existing clock signal line. By combining power delivery with data communication infrastructure, the patent reduces the total terminal count while ensuring reliable CRUM unit operation.
2Device complexity
If the clock signal generation method is modified to work without a power terminal, then the number of terminals is reduced, but existing universal ICs cannot be used due to protocol incompatibility
Solution Approach 1:
The clock signal parameters (frequency, duty cycle, voltage level) are dynamically adjusted based on operational mode. During idle periods, the signal serves as power supply; during active periods, it provides data synchronization. This parameter modulation enables compatibility with existing universal ICs while reducing terminal count.
Solution Approach 2:
The system transitions between different operational states (idle and active) with corresponding signal characteristics. The clock signal dynamically changes its role from power carrier to data synchronizer, enabling the CRUM unit to function with fewer terminals while maintaining IC compatibility.
3Reliability
If more terminals and interfaces are used for CRUM unit connection, then power and data transmission can be ensured, but the size and cost of the consumable unit increase
Solution Approach 1:
The clock signal line performs multiple functions: data synchronization during communication and power supply during idle periods. This eliminates the need for separate power and data terminals, reducing the overall connector size while maintaining reliable power and data transmission.
Solution Approach 2:
Power delivery and data communication functions are merged into a single terminal interface. By combining these functions, the patent reduces the physical size of the connector and overall consumable unit while ensuring reliable operation.
Data Source
AI summary
A customer replacement unit monitor (CRUM) unit that can be mounted in an image forming apparatus includes a decoder which receives first clock signals from the image forming apparatus and converts the first clock signals into second clock signals, a memory which stores data related with a consumable unit, and a controller which manages the memory based on data signals transmitted from the image forming apparatus and the second clock signals. The first clock signals are divided into a data section in which the data signals are transmitted and received and an idle section in which the data signals are not transmitted and received. The first clock signals have a first frequency on the data section while having a second frequency on the idle section, and the second clock signals are clock signals maintaining a high value or a low value on the idle section.