Recording Element Substrate Antifuse Reading Accuracy

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Solution Overview

Problem

Existing recording element substrates for liquid ejection heads face issues with faulty readings of antifuse elements due to variations in resistance values of parallel resistor elements, leading to erroneous recording and reduced reliability.

Innovation Solution

Incorporating a memory reference resistance with the same resistance value as the parallel resistance, connected in parallel with the antifuse element, and a switch to select between the two resistances during reading, which helps in reducing faulty readings by canceling out variations and ensuring accurate voltage measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a resistor element is connected in parallel with the antifuse element to prevent erroneous recording, then the reliability of the antifuse element is improved, but the resistance value may deviate from a predetermined value causing faulty readings

Engineering Contradiction:

Improvereliability of antifuse elementVSAvoidreading accuracy of antifuse element

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent introduces a reference resistor that is a copy of the parallel resistor, connected in parallel with the antifuse element through a switch. This reference resistor has the same resistance value as the parallel resistor, providing a stable reference for reading operations and eliminating the effect of resistance value deviations on reading accuracy.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The reference resistor acts as an intermediary element that mediates between the parallel resistor and the reading circuit. By providing a stable reference value through the switch, it allows accurate measurement of the antifuse element's state without being affected by variations in the parallel resistor's resistance value.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the resistance value of the parallel resistor element is used for reading operations, then the device complexity is reduced, but the measurement precision deteriorates due to resistance value deviations

Engineering Contradiction:

Improvecircuit complexityVSAvoidreading accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent creates a reference resistor that is a copy of the parallel resistor with the same resistance value. This reference resistor is connected in parallel with the antifuse element through a switch, providing a stable reference for reading operations without significantly increasing device complexity.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent uses a switch to dynamically connect the reference resistor to the reading circuit only when needed. This dynamic connection allows the system to maintain simplicity during normal operation while providing high precision during reading operations, effectively balancing device complexity and measurement precision.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11845274B2Recording element substrate, liquid ejection head and recording apparatus

Publication Date: 2023.12.19 CANON KK

AI summary

A recording element substrate for a liquid ejection head is provided with a storage section including an antifuse element and a first resistor connected in parallel with the antifuse element, and a second resistor that is connected in parallel with the storage section and serves as a reference in rating information of the antifuse element, and a second switch connected to the second resistor.