Summary:: With the increasing popularity and complexity of electronic products, the accurate measurement of the thickness distribution of multilayer flexible circuit boards as a key component has become particularly important. Considering the variety of materials and colors on the PCB, traditional contact measurement methods are often difficult to apply. In this paper, the LTC series spectral confocal sensor, a non-contact measurement sensor based on the spectral confocal principle, is introduced in the thickness distribution measurement of multilayer flexible circuit boards. The sensor is not only compatible with matte, mirror, transparent and other materials and colors of circuit boards, but also has micron-level measurement accuracy and up to 10kHz measurement speed, which meets the rapid measurement needs of the first production line. In addition, the double-head through-beam configuration and a variety of output signal options make the measurement process more flexible and efficient.
I. Introduction
As an indispensable part of modern electronic equipment, the quality and performance of multilayer flexible circuit boards directly affect the stability and reliability of the entire equipment. In the production process, accurate measurement of the thickness distribution of the printed circuit board is a key link to ensure product quality. However, due to the diversity of materials and colors on the circuit board, traditional contact measurement methods are often limited by measurement accuracy and scope of application. Therefore, there is an urgent need to find a non-contact measurement sensor that can be compatible with a wide range of materials and colors, and has high accuracy and fast measurement capabilities.
2. Principle and characteristics of spectral confocal sensor
A spectral confocal sensor is a non-contact measuring device based on the principle of spectral confocal. It uses spectral interferometry to accurately calculate the height or thickness of an object's surface by measuring the change in the interference fringes formed by light after it is reflected on the surface of the object. Spectral confocal sensors have the following notable features:
High-precision measurements: Spectral confocal sensors can achieve micron-level measurement accuracy, which can meet the requirements of accurate measurement of the thickness distribution of multilayer flexible circuit boards.
Wide applicabilityDue to the non-contact nature of the spectral confocal principle, the sensor has good adaptability to the material and color change of the measured object, and can be compatible with matte, mirror, transparent and other material circuit boards.
High-speed measurements: The spectral confocal sensor has a measurement speed of up to 10kHz, which can meet the rapid measurement needs of the first production line.
Flexible configuration options: The spectral confocal sensor can be configured with a dual-head through-beam mode for simultaneous position measurement with a suitable bracket. At the same time, the sensor controller provides a variety of output signal options, such as network port, 485, analog, etc., which is convenient for integration with different control systems.
3. Application cases
In the production line of a well-known electronics manufacturer, the thickness distribution measurement of multilayer flexible circuit boards has become an important part of quality control. Due to the variety of materials and colors available on the board, traditional contact measurement methods cannot meet the measurement needs. With the introduction of the LTC series spectral confocal sensors, this problem has not only been successfully solved, but also measurement accuracy in the micron range and measurement speeds of up to 10kHz have been achieved. With a double-head through-beam configuration and a variety of output signal options, the sensor seamlessly integrates with the production line's control system, greatly improving production efficiency and product quality.
IV. Conclusions
The application of spectral confocal sensor in the thickness distribution measurement of multilayer flexible circuit boards not only solves the problem that traditional measurement methods are not compatible with a variety of materials and colors, but also realizes high-precision, fast and flexible measurement. With the continuous development and upgrading of electronic products, spectral confocal sensors will play a more important role in the future, providing strong support for the quality control and production efficiency improvement of the electronics manufacturing industry.