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Precise, Non-Contact Surface Roughness Measurement

Copper Foil for Printed Circuit Boards

Printed circuit boards used in 5G applications are designed to prevent transmission loss. To do this, the copper circuit’s surface roughness is minimized.

Copper Foil for Printed Circuit Boards

Image of a printed circuit board cross section

Image of a printed circuit board cross section

Conventionally, the wettability on the copper foil side was used to control the bond quality of the base copper foil and the organic material. However, demand for surface roughness evaluation of the copper foil continues to increase as the functionality of flexible printed circuit (FPC) boards improves. 

Copper Foil for Printed Circuit Boards

Surface Acoustic Wave Device Wafers

Surface acoustic wave devices use vibrations transmitted through a solid surface to extract certain signals from background radio waves. In high-frequency 5G applications, the back of the wafer is roughened to scatter undesirable frequencies.

Surface Acoustic Wave Device Wafers

Surface Acoustic Wave Device Wafers

Roughness Measurement Challenges

Conventional roughness measurement using a contact stylus can damage the sample’s surface and is not sensitive enough to detect minute roughness changes.

Laser Microscope Roughness Measurement

The OLS5100 3D measuring laser microscope enables highly accurate, non-contact surface roughness measurement of copper foil and wafers. It’s capable of high-resolution surface roughness measurements in very small areas without damaging the sample’s surface.


3D measurement of copper foil

Copper foil for medium and low frequencies

Copper foil for medium and low frequencies

High-frequency (5G) copper foil

High-frequency (5G) copper foil

High-resolution image of copper foil surface

High-resolution image of copper foil surface

3D image of copper foil surface

3D image of copper foil surface


Roughness measurement of the back surface of lithium tantalate wafer after copper roughening

The roughened state can be immediately imaged

The roughened state can be immediately imaged

Acquire accurate data based on surface roughness

Acquire accurate data based on surface roughness

OLS5100 3D Measuring Laser Microscope

OLS5100
3D Measuring Laser Microscope

Surface Roughness Measurement Resources


Related Application Notes:
Copper Foil Surface Roughness for 5G Printed Circuit Boards

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