Mounting Head Height Sensing for Coating Film Transfer Accuracy
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Solution Overview
Problem
In component mounting machines, measuring the height of the container's bottom face after a coating film is formed is challenging, as the initial empty state height is required for accurate film thickness calculation.
Innovation Solution
A component mounting machine equipped with a head, a height sensor, and a control device that measures the height of a predetermined measurement point on the container, allowing recognition of the container's bottom face or coating film height regardless of the film's presence, enabling proper positioning and transfer of the coating film to connection terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the height of the bottom face of the container is measured in advance in an empty state, then the film thickness can be calculated accurately, but the measurement cannot be performed after the coating film is formed
Solution Approach 1:
The height of a predetermined measurement point on the container is measured in advance before the coating film is formed. This preliminary measurement data is stored and used later to calculate the film thickness by comparing it with the height measured after coating, enabling accurate film thickness measurement without needing to measure the bottom face directly after coating is applied.
2Manufacturing precision
If the height of the measurement point is used to determine bottom face or coating film height, then positioning accuracy is improved, but the system complexity increases
Solution Approach 1:
A predetermined measurement point on the container serves as an intermediary reference point. Instead of directly measuring the bottom face or coating film height which are difficult to access, the height of this intermediate measurement point is measured. The control device then uses this intermediate measurement along with predetermined height relationships to calculate the required bottom face or coating film height, achieving accurate positioning without direct measurement of the target surfaces.
3Length of moving object
If the coating film thickness is reduced for miniaturized components, then component size is reduced, but paste printing accuracy deteriorates
Solution Approach 1:
The system measures the actual height of the measurement point on the container and feeds this information back to the control device. The control device calculates the actual coating film thickness based on the height difference between empty and coated states, and uses this feedback information to adjust the dipping depth of the component connection terminals. This ensures accurate coating film transfer even when working with miniaturized components and reduced paste amounts.
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
Ensures accurate recognition and positioning of the container, reliable transfer of the coating film to connection terminals, and provides warnings for improper positioning, maintaining consistent film transfer even with changing film heights.
Implementation Method 1
a height sensor provided on the head and capable of measuring the height of the measurement point of the container
Data Source
AI summary
Component mounting machine includes head, a device for moving head, transfer unit, and a mounting controller. Circular plate is an example of a container in which paste is placed. The bottom face of circular plate and the upper surface of the side wall have a predetermined height relationship. Height sensor is disposed on the lower face of head. Height sensor measures the height of the upper surface of the side wall of circular plate, which is a measurement point. The mounting controller recognizes the height of the bottom face of circular plate or the height of the surface of coating film disposed on circular plate from the height of the top surface of the side wall of circular plate measured by height sensor.