Floating Plate Socket Structure for Stable POP Package Pick-and-Place
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Solution Overview
Problem
Conventional test devices for package-on-package (POP) semiconductor packages face issues with inefficient pick-and-place operations due to narrow adsorption and desorption areas, sticky phenomena, and high replacement costs due to integrated vacuum pickers and sockets.
Innovation Solution
A test device with a pusher, upper socket, floating plate, and silicone pad configuration that expands the adsorption and desorption areas, uses a floating plate for stable pick-and-place operations, and includes antistatic treatment to prevent sticky phenomena, allowing separate replacement of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a vacuum picker is integrally fastened to the upper socket, then the structure is simplified, but replacement cost increases and component flexibility decreases
Solution Approach 1:
The pusher assembly is segmented into separable components: the pusher body, the upper socket, and the vacuum picker are designed as independent replaceable parts. This allows the vacuum picker to be replaced separately from the upper socket, reducing replacement costs and increasing maintenance flexibility while maintaining a relatively simple overall structure.
2Device complexity
If the vacuum picker contacts only the central portion of the lower package, then the structure is simple, but the adsorption area is narrow causing pick-and-place errors
Solution Approach 1:
The vacuum picker is designed with a plate-shaped structure that contacts the lower package across a two-dimensional surface area rather than a single central point. This dimensional expansion from point contact to surface contact significantly increases the adsorption area, improving pick-and-place reliability while maintaining structural simplicity.
3Reliability
If the vacuum picker is made of silicone material, then adsorption performance is improved, but sticky phenomena occur due to heat and static electricity
Solution Approach 1:
The material composition of the vacuum picker is changed from pure silicone to a composite material incorporating antistatic agents. This parameter change in material properties maintains the elastic adsorption performance of silicone while adding antistatic characteristics that prevent sticky phenomena caused by static electricity and heat.
4Reliability
If the adsorption area is expanded to the entire lower package surface, then pick-and-place stability is improved, but the device complexity increases
Solution Approach 1:
The plate-shaped vacuum picker serves multiple functions simultaneously: it provides broad surface contact for stable adsorption across the entire lower package, maintains structural simplicity through its basic plate geometry, and incorporates antistatic properties to prevent sticky phenomena. This multi-functionality achieves high pick-and-place stability without significantly increasing device complexity.
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
Enhances pick-and-place stability, reduces errors, prevents sticky issues, and lowers replacement costs by increasing adsorption and desorption areas, and enables testing of packages with central terminals without limitations.
Implementation Method 1
a vacuum pressure of a vacuum generator is applied to an inner area of the lower package except for an outer area through the open groove
Implementation Method 2
the floating plate is movable by elasticity of the silicone pad
Data Source
AI summary
A test device for a semiconductor package and provides a test device for a semiconductor package for enlarging a pick and place area of a lower package to an entire size of the lower package using a floating plate movably coupled to a pusher and having a silicon pad disposed between the pusher and the floating plate to be moveable by elasticity of the silicon pad.