Replaceable Printing Component Factory Identity Code Authentication
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Solution Overview
Problem
Existing methods for authenticating replaceable printing components, such as ink or toner cartridges, are inadequate in detecting defective or counterfeit components due to electrical defects or modifications, leading to improper authentication and potential damage to printing systems.
Innovation Solution
Implementing unique identification codes based on measurements of analog performance parameters from electronic components within the cartridges, such as transistors, which are fabricated on silicon printhead devices, and using encryption algorithms like RSA, DSA, ECDSA, 3DES, and AES to generate and store factory identification codes, allowing for authentication by comparing field ID codes with factory ID codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital ID bit memory cells are used for authentication, then authentication capability is provided, but electrical defects or modifications can cause improper authentication
Solution Approach 1:
The patent changes the authentication parameter from digital logic levels (0 or 1) to analog electrical characteristics (threshold voltage, saturation current, resistance) of test components. This allows detection of physical defects that would not manifest as logic errors, thereby improving authentication reliability while maintaining detection precision through factory-stored reference values for comparison.
2Reliability
If multiple analog performance parameters are measured, then identification uniqueness is improved, but measurement complexity increases
Solution Approach 1:
The patent performs preliminary measurement and storage of multiple analog performance parameters (threshold voltage, saturation current, resistance) of test components during manufacturing. These factory-measured reference values are stored in memory alongside the identification code. During field authentication, the system only needs to re-measure and compare against pre-stored values, reducing on-site measurement complexity while maintaining high identification uniqueness through multiple parameters.
Data Source
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AI summary
In one example implementation, a replaceable printing component includes a memory and a plurality of test components, wherein a factory identification code is stored in the memory that comprises a resistance measured on the test components, wherein the test components are selected from the group consisting of a metal resistor, a polysilicon resistor, a thermal resistor, a PMOS transistor, and an NMOS transistor.