Tapered Lead Exposed Portions Suppress Short Circuits in Resin-Covered Electronics
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Solution Overview
Problem
Leadless-package electronic apparatuses face challenges in downsizing due to the generation of metal burrs during dicing, which can cause short circuits between adjacent leads, limiting the reduction in distance between leads and hindering the miniaturization of the apparatus.
Innovation Solution
The electronic apparatus features a resin member with first and second side surfaces where leads are exposed, each having tapered portions that narrow towards the resin surfaces, with front surfaces flush with the resin surfaces, reducing the likelihood of short circuits and allowing for closer lead spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between adjacent leads is reduced to downsize the electronic apparatus, then the apparatus size is reduced, but metal burrs generated during dicing may cause short circuits between the leads
Solution Approach 1:
The resin member serves as an intermediary substance that fills the space between adjacent leads. During dicing, the resin material covers and isolates the leads, preventing metal burrs from causing short circuits while allowing the leads to be positioned closer together. This mediator enables both reduced lead spacing and maintained reliability.
Solution Approach 2:
The resin member provides beforehand cushioning by covering the leads before the dicing process occurs. This protective layer is in place prior to cutting, cushioning the leads against the harmful effects of metal burr generation and preventing short circuits in advance.
2Area of stationary object
If the distance between adjacent leads is reduced, then the apparatus can be downsized, but the risk of short circuit due to metal burrs increases
Solution Approach 1:
The resin member acts as an intermediary that reduces the harmful impact of metal burrs on the leads. By positioning the resin between adjacent leads and allowing it to cover the leads during dicing, the harmful effects of metal burrs are mitigated, enabling closer lead spacing without increased short circuit risk.
Solution Approach 2:
The resin member converts the potentially harmful dicing process into a beneficial outcome. While dicing generates metal burrs that could cause short circuits, the resin coverage transforms this harmful process into an opportunity to simultaneously achieve closer lead spacing and maintain reliability, turning the harm into a benefit.
Data Source
AI summary
Provided is an electronic apparatus including an electronic part, a resin member that covers the electronic part, and a plurality of leads each electrically connected to the electronic part, the resin member including a first resin side surface facing one side in a first direction orthogonal to a thickness direction of the resin member, the plurality of leads including a plurality of first side exposed portions arranged along the first resin side surface, each of the plurality of first side exposed portions being exposed from the first resin side surface, each of the plurality of first side exposed portions including a first tapered portion becoming narrower toward the first resin side surface as viewed in the thickness direction, the first tapered portion including a first front surface that faces the same direction as the first resin side surface in the first direction and is flush with the first resin side surface.