Print Element Board Terminal Placement for Crack Resistance

Solution Overview

Problem

Print element boards with a substantially parallelogrammatic shape are prone to chip and crack formation at acute angles, leading to potential electrical failures due to wire disconnection issues, especially when terminals are placed near the smaller angle end, compromising the electric reliability of the board.

Innovation Solution

The print element board design features terminals and wires positioned closer to the end with a larger angle, maintaining a longer distance from the acute angle area to prevent chip formation and disconnection, with the electric connection area strategically placed near the end with the larger angle to enhance reliability and minimize the impact of potential damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminals are arranged near a first end with a small angle in a parallelogrammatic print element board, then the electrical connection is achieved, but chips and cracks may be produced at the acute angle, causing wire disconnection and reducing electric reliability

Engineering Contradiction:

Improveelectric reliabilityVSAvoidchip and crack formation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the placement strategy for terminals based on the local geometric characteristics of the board. Terminals are specifically positioned away from acute angle regions where stress concentration occurs, while utilizing the larger angle end that is less susceptible to chip and crack formation. This localized adaptation to geometric properties prevents electrical failures without compromising overall connection functionality.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs asymmetry by recognizing that the parallelogrammatic board has non-uniform angle properties at its ends. Instead of treating all ends equally, the invention asymmetrically places terminals at the end with the larger angle, exploiting the inherent geometric asymmetry to avoid the more vulnerable acute angle regions while maintaining effective electrical connection.

Inventive Principle:

Principle #4Asymmetry

2Area of stationary object

If the print element board has a substantially parallelogrammatic shape, then space utilization is improved, but the acute angle ends are more prone to damage during cutting and assembly

Engineering Contradiction:

Improvespace utilizationVSAvoidresistance to chip and crack

Core Design Contradiction:

Area of stationary objectVSStrength

Solution Approach 1:

The patent applies local quality by differentiating the placement strategy for terminals based on the local geometric characteristics of the board. Terminals are specifically positioned away from acute angle regions where stress concentration occurs, while utilizing the larger angle end that is less susceptible to chip and crack formation. This localized adaptation to geometric properties prevents electrical failures without compromising overall connection functionality.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3463901B1Print element board, liquid ejection head, and liquid ejection apparatus

Publication Date: 2022.05.25 CANON KK

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Figure 3A~3B

AI summary

A print element board includes a surface provided with a first side and a plurality of terminals arranged along the first side near the first side, in which an angle at a first peak located at a first end of the first side is smaller than an angle at a second peak located at a second end of the first side, and a printing element electrically connected with the terminals for recording. A distance between the first peak and a first terminal disposed closest to the first peak is longer than a distance between the second peak and a second terminal disposed closest to the second peak.