ESD Protection Device Discharge Auxiliary Section
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Solution Overview
Problem
Existing ESD protection devices face challenges in achieving excellent ESD properties due to variations in sintering agent concentration and vaporization, which affect the sintering characteristics and productivity, particularly when sintering in an open sheath, leading to insufficient sintering of the discharge auxiliary section.
Innovation Solution
An ESD protection device comprising a ceramic insulating material with discharge electrodes and a discharge auxiliary section formed from a sintered body containing conductive and semiconductor particles, with a higher content of alkaline metal and boron components in the auxiliary section compared to the insulating material, to reduce discharge starting voltage and improve sintering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sintering agent (alkaline metal component and/or boron component) is added to the green sheet multilayer body to improve sintering characteristics, then the sintering characteristics are improved, but the sintering agent vaporizes during sintering causing concentration variation and contraction rate variation
Solution Approach 1:
The patent applies local quality by concentrating the sintering agent (alkaline metal component and/or boron component) specifically in the discharge auxiliary section rather than uniformly distributing it throughout the entire ceramic insulating material. This localized concentration allows the discharge auxiliary section to achieve proper sintering and excellent ESD properties while the ceramic insulating material maintains structural stability with minimal sintering agent content, thereby reducing overall vaporization loss.
2Loss of substance
If sintering is performed in a closed sheath to suppress vaporization of the sintering agent, then vaporization is suppressed, but productivity is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the distribution and concentration of the sintering agent to enable sintering in an open sheath. By concentrating the sintering agent in the discharge auxiliary section at specific concentrations (0.1-10% by mole), the patent achieves sufficient sintering without requiring a closed sheath environment, thus maintaining high productivity while controlling vaporization through localized concentration rather than environmental containment.
3Productivity
If no sintering agent is added to enable sintering in an open sheath and maintain productivity, then productivity is maintained, but the discharge auxiliary section is insufficiently sintered and excellent ESD properties cannot be obtained
Solution Approach 1:
The patent applies local quality by concentrating the sintering agent (alkaline metal component and/or boron component) specifically in the discharge auxiliary section rather than uniformly distributing it throughout the entire ceramic insulating material. This localized concentration allows the discharge auxiliary section to achieve proper sintering and excellent ESD properties while the ceramic insulating material maintains structural stability with minimal sintering agent content, thereby reducing overall vaporization loss.
Solution Approach 2:
The patent applies composite materials by creating a heterogeneous structure where the discharge auxiliary section has a different composition (higher sintering agent content) compared to the ceramic insulating material (lower sintering agent content). This composite approach allows each region to be optimized for its specific function: the discharge auxiliary section for ESD performance and the ceramic insulating material for structural integrity.
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
The solution enables the production of ESD protection devices with enhanced ESD properties and improved durability, allowing for sintering in an open sheath while maintaining high productivity by optimizing the concentration of alkaline metal and boron components in the discharge auxiliary section.
Implementation Method 1
ESD protection device which suppress destruction of electronic apparatuses caused by electro-static discharge (ESD)
Implementation Method 2
a green sheet multilayer body which is a multilayer body formed of ceramic green sheets. In order to improve the sintering characteristics of the green sheet multilayer body, the addition of a sintering agent, such as an alkaline metal component and/or a boron component
Implementation Method 3
the sintering agent is likely to be vaporized. Hence, the sintering agent is vaporized during the sintering of the green sheet multilayer body
Data Source
AI summary
An ESD protection device 1 includes a ceramic insulating material 10, first and second discharge electrodes 21 and 22, and a discharge auxiliary section 51. The discharge auxiliary section 51 is an electrode configured to reduce a discharge starting voltage between the first discharge electrode 21 and the second discharge electrode 22. The discharge auxiliary section 51 comprises a sintered body including conductive particles and at least one of semiconductor particles and insulating particles. At least the discharge auxiliary section 51 comprises at least one of an alkaline metal component and a boron component. The content of at least one of the alkaline metal component and the boron component in the discharge auxiliary section 51 is larger than the content of at least one of the alkaline metal component and the boron component in the ceramic insulating material 10.