Vacuum Picker Segmentation for Semiconductor Package Testing
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Solution Overview
Problem
Existing test apparatuses for package-on-package (POP) type semiconductor packages face challenges such as the sticky phenomenon due to silicone oil elution, reduced picking power over time, and increased replacement costs due to integrated vacuum picker and upper socket design.
Innovation Solution
The apparatus includes a vacuum picker with a body made of silicone or rubber, and socket and package contact parts made of anti-adhesion materials like polyimide film or engineering plastic. The vacuum picker is coupled to the upper socket via an adhesive tape, with a mounting groove and insulation pad hole configuration to prevent oil flow and maintain picking power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vacuum picker is made of silicone to protect the semiconductor package and improve vacuum picking performance, then picking performance is improved, but silicone oil elution causes sticky phenomenon
Solution Approach 1:
The vacuum picker is divided into two functional parts: a silicone body part for generating vacuum force and a separate non-silicone contact part for direct contact with the semiconductor package. This segmentation allows each part to perform its specific function without the harmful effects of silicone oil elution affecting the package.
Solution Approach 2:
Different parts of the vacuum picker are made from different materials with different properties. The body part uses silicone for elastic deformation and vacuum generation, while the contact part uses non-silicone material to prevent adhesion. This local differentiation of material properties solves the contradiction between picking performance and sticky phenomenon prevention.
2Duration of action of moving object
If the vacuum picker is kept in contact with the lower package for one to two weeks during reliability test, then testing is performed, but silicone oil elution accumulates and causes sticky phenomenon
Solution Approach 1:
The harmful silicone material is extracted from the contact surface and confined to the body part of the vacuum picker. By removing silicone from the interface with the semiconductor package, the harmful oil elution is eliminated while maintaining the vacuum picking function during extended contact periods.
3Object-generated harmful factors
If coating with antistatic or special coating is applied to prevent sticky phenomenon, then adhesion is reduced, but the problem of sticky phenomenon has not been solved
Solution Approach 1:
Instead of applying coatings to modify surface properties, the invention changes the fundamental material parameter of the contact part by using non-silicone material. This material substitution fundamentally eliminates the oil elution issue rather than attempting to mitigate it through surface treatment.
4Device complexity
If vacuum picker and upper socket are integrated, then structure is simplified, but replacement costs increase when defective
Solution Approach 1:
The integrated assembly is segmented into the upper socket and the vacuum picker, which can be independently replaced. This modular design maintains structural simplicity while enabling cost-effective repair by replacing only the defective component rather than the entire integrated assembly.
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 prevents the sticky phenomenon, maintains stable picking power over time, and allows for easy replacement of defective components, reducing costs and improving operational efficiency.
Implementation Method 1
a vacuum picker (70) integrally fastened to the upper socket (60) to pick up a lower package (10)
Implementation Method 2
a body part (710) made of silicone or rubber
Data Source
AI summary
An apparatus for testing a package-on-package (POP) type semiconductor package that includes a vacuum picker that has vacuum holes that communicate with an insulation pad hole, the vacuum picker includes a body part made of silicone or rubber, and a socket contact part and a package contact part made of any one of polyimide film, engineering plastic, and synthetic resin, and the socket contact part is attached to a mounting groove by an adhesive tape, such that the vacuum picker is coupled to an upper socket.