Chip Resistor Trimming Grooves for Hotspot Dispersion
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Solution Overview
Problem
The existing configuration of trimming grooves in chip resistors, where they intersect near the center, leads to hotspot formation and reduced heat dissipation due to concentrated electric fields, and microcracks during trimming, affecting the electrical characteristics and durability of the resistive element.
Innovation Solution
The chip resistor design features first and second trimming grooves with vertical and horizontal components that extend orthogonally and approach each other, respectively, with terminal ends separated to prevent overlap, dispersing hotspots and reducing microcrack-induced performance issues by balancing electric field distribution and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If trimming grooves are formed to intersect near the center of the resistive element, then resistance value adjustment precision is improved, but heat dissipation deteriorates due to hotspot formation
Solution Approach 1:
The patent divides the single intersecting trimming groove configuration into multiple separate trimming grooves that do not intersect. By segmenting the trimming structure, the concentrated electric field at the intersection point is eliminated, preventing hotspot formation while maintaining resistance adjustment capability through multiple distributed trimming locations.
Solution Approach 2:
The patent applies different trimming groove configurations to different regions of the resistive element. Instead of a single central intersection, multiple trimming grooves are strategically positioned in specific regions to achieve both precise resistance adjustment and uniform heat distribution, optimizing local electric field characteristics.
2Measurement precision
If trimming grooves are inserted into the resistive element for resistance adjustment, then resistance value precision is improved, but microcracks are generated that harm electrical characteristics and durability
Solution Approach 1:
The patent designs the trimming groove configuration in advance to avoid deep insertions that would cause microcracks. By planning the groove paths to remain shallower and more distributed, the structure preemptively prevents the formation of harmful microcracks while still achieving the necessary resistance adjustment precision.
Solution Approach 2:
The patent converts the potential harm of deep trimming groove insertions into a benefit by using multiple shallower grooves instead. This approach distributes the trimming effect across multiple locations, achieving the same resistance adjustment precision while eliminating the microcrack formation that would harm reliability.
3Ease of manufacture
If trimming grooves are formed to intersect near the center, then resistance adjustment capability is improved, but heat dissipation is reduced due to concentrated electric field
Solution Approach 1:
The patent segments the concentrated central trimming into multiple distributed trimming grooves. This segmentation maintains the ease of resistance adjustment capability while redistributing the electric field to improve heat dissipation efficiency, preventing energy loss in the form of hotspots.
Solution Approach 2:
The patent transitions from a single-point (central intersection) trimming approach to a distributed multi-point trimming approach. By changing the spatial dimensionality of the trimming configuration from concentrated to distributed, the patent achieves both ease of manufacture and improved heat dissipation.
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
This configuration effectively disperses hotspots, enhances heat dissipation, and minimizes the adverse effects of microcracks, improving the performance and durability of the chip resistor by balancing electric field distribution and facilitating better heat escape to the electrodes.
Implementation Method 1
the potential distribution becomes concentrated (the electric field becomes stronger) in the center of the resistive element
Implementation Method 2
heat dissipation is lowered... facilitating better heat escape to the electrodes
Data Source
AI summary
An object is to provide a chip resistor in which hot spots can be dispersed and the adverse effects on performance caused by microcracks can also be reduced. A chip resistor includes an insulating substrate, a resistive element, and electrodes. In the resistive element, a first trimming groove and a second trimming groove are formed. A first vertical groove of the first trimming groove and a second vertical groove of the second trimming groove are formed with a spacing in between in an X1-X2 direction. A first horizontal groove of the first trimming groove and a second horizontal groove of the second trimming groove extend in directions approaching each other, and terminal ends of the first horizontal groove and the second horizontal groove are formed to be separated in the X1-X2 direction such that the first horizontal groove and the second horizontal groove do not overlap in a Y1-Y2 direction.