Mounting Head With Float Part for Ultra-Low Component Load Control
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Solution Overview
Problem
Existing mounting technologies face challenges in applying a low enough load to small and thin electronic components to prevent cracking during mounting on a board, as the load control capabilities of voice coil motors are insufficient for these delicate components.
Innovation Solution
A mounting head with a vertically movable drive part, a float part supported by the drive part, and a linear motor that applies a vertical upward pressing force to control the load applied to the electronic component, allowing for precise adjustment of the load by subtracting the upward pressing force from the float part's own weight, enabling the application of extremely low loads of 0.1 N or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voice coil motor is used to apply load to electronic component, then the electronic component can be mounted on board, but the load resolution is uncontrollable and insufficient for delicate components
Solution Approach 1:
The patent introduces a float part as an intermediary between the drive part and mounting tool. The float part has a weight that provides a baseline downward force, while the linear motor provides upward counterforce. This intermediary mechanism allows for fine control of the load applied to the electronic component by balancing gravitational force on the float part against motor force, achieving load resolution of 0.1 N or less that cannot be obtained with voice coil motors alone.
2Ease of operation
If voice coil motor is used to push electronic component onto board, then mounting can be performed, but load control is insufficient for small and thin components
Solution Approach 1:
The patent changes the physical parameters of the mounting system by introducing a float part with specific weight and using a linear motor with adjustable pressing force. By adjusting the weight of the float part and the pressing force of the linear motor, the load applied to the electronic component can be precisely controlled to be 0.1 N or less, preventing cracking of small and thin components while maintaining mounting capability.
3Measurement precision
If linear motor applies upward pressing force to float part, then load control precision is improved, but device complexity increases
Solution Approach 1:
The patent uses the float part's weight as a counterweight to the linear motor's upward pressing force. This creates a balanced system where the downward gravitational force on the float part counteracts the upward motor force, allowing for precise load control. The counterweight mechanism simplifies the control system compared to using only active motor control, as gravity provides a stable reference force that can be easily balanced against motor output.
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 allows for accurate and controlled low-load application to small and thin electronic components, effectively preventing cracking during mounting and ensuring precise placement on a board.
Implementation Method 1
a linear motor that applies a vertical upward pressing force to the float part
Implementation Method 2
The drive part moves downward in the vertical direction to apply a load due to own weight of the float part to the electronic component
Data Source
AI summary
A mounting head includes a drive part that moves in a vertical direction to apply a load to an electronic component, a float part supported by the drive part in a vertically movable manner, and a linear motor that applies a vertical upward pressing force to the float part. The linear motor includes a stator fixed on the drive part and a moving member fixed on the float part. The drive part moves downward in the vertical direction to apply the load due to own weight of the float part to the electronic component to mount the electronic component onto the board. The linear motor is driven to control a magnitude of the load applied to the electronic component by applying the vertical upward pressing force to the float part.