Ceramic Capacitor Packaging for Uniform Suction and Crack Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The surface cracking of multilayer ceramic capacitors during mounting on a mounting board is caused by variations in the density of the surface of the pocket openings in existing multilayer ceramic capacitor packages.
Innovation Solution
The multilayer ceramic capacitor package ensures that the difference in densities of the surfaces on the opening side of the pockets is maintained within a specific range (0% to 4% or less) by positioning either the main surface or the side surface of the multilayer ceramic capacitors close to the pocket opening, thereby ensuring uniform porosity and reducing the risk of cracking during the mounting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multilayer ceramic capacitors are mounted using a mounter with suction, then automatic mounting efficiency is improved, but surface cracking occurs due to density variations
Solution Approach 1:
The invention changes the physical parameter of density by controlling the forming pressure during capacitor manufacturing. By adjusting the pressing force applied to the green sheets, the density of the capacitor surface is optimized to be within ±5% of the average density, preventing surface cracking during suction-based automatic mounting while maintaining high productivity
2Manufacturing precision
If pressing force is increased to improve density uniformity, then manufacturing precision is improved, but production complexity increases
Solution Approach 1:
The invention applies local quality by differentiating the pressing force in different regions of the capacitor. A greater pressing force is applied to the surface region that will contact the mounter suction cup, while the internal structure maintains its original density characteristics. This localized pressure application ensures density uniformity at the critical surface area without requiring complex overall pressing mechanisms
Solution Approach 2:
The invention performs preliminary action by pre-compressing the green sheets during the forming stage before firing. The pressing force is applied in advance to create the desired density distribution, eliminating the need for complex post-processing or adjustment mechanisms during mounting operations
Data Source
AI summary
A multilayer ceramic capacitor package accommodating multilayer ceramic capacitors includes a carrier tape that is elongated and includes recess pockets at equal or substantially equal intervals in a longitudinal direction, a cover tape that is elongated and attached to the carrier tape to cover an opening of each of the pockets, and the multilayer ceramic capacitors respectively accommodated in the pockets. In the multilayer ceramic capacitor package, in adjacent multilayer ceramic capacitors, a difference in densities of surfaces on an opening side of the pockets is about 0% or more and about 4% or less.