Chip Resistor Reverse Surface Electrodes Anti-Surge
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Solution Overview
Problem
Conventional chip resistors face a challenge in maintaining anti-surge properties as they are downsized, with existing designs not adequately addressing the deterioration of these properties in smaller chip sizes.
Innovation Solution
The design includes a base member with specific electrode configurations and a resistive element layout, featuring reverse surface electrodes that extend beyond the base member's edges, inner electrodes that overlap with the resistive element, and a trimming groove for resistance adjustment, which collectively enhance anti-surge properties while allowing for downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the chip size is reduced for downsizing, then the volume of the resistive element becomes smaller, but the anti-surge properties deteriorate
Solution Approach 1:
The patent introduces reverse surface electrodes on the back side of the chip that extend beyond the chip edges, utilizing the third dimension (depth/thickness) and lateral extension to increase effective electrode length without increasing the chip's planar footprint. This dimensional approach allows maintaining adequate electrode dimensions for surge resistance while achieving chip downsizing.
Solution Approach 2:
The electrode system is segmented into multiple components: inner electrodes on the front surface, reverse surface electrodes on the back surface, and ground electrodes. This segmentation allows each electrode type to perform specific functions, with reverse surface electrodes providing extended path length for surge current while inner electrodes maintain compact connections to the resistive element.
2Device complexity
If the inner electrode length is reduced for compact design, then the chip layout becomes more compact, but the electrical connection reliability may be compromised
Solution Approach 1:
Instead of extending inner electrodes laterally across the chip surface, the patent extends electrode functionality to the reverse surface, allowing electrical connections to traverse through the chip thickness dimension. This provides adequate connection length and reliability without compromising front surface layout compactness.
Data Source
AI summary
A chip resistor includes a base member, a resistive element formed on the base member, a first inner electrode held in contact with a first end portion of the resistive element, a second inner electrode held in contact with a second end portion of the resistive element, a first reverse surface electrode reaching a first end portion of the base member, and a second reverse surface electrode reaching a second end portion of the base member. The length of the first and the second reverse surface electrodes is in a range of 2/10 to 3/10 of the length of the base member. Also, the length of the first and the second reverse surface electrodes is greater than the length of the first and the second inner electrodes.