Mask crease inspection
An OPF backlight projects light from the back side of the mask to inspect whether any creases are bent. With a diffusion type backlight, the light scatters as it passes through the mask, causing the crease area to appear blurred. In contrast, a narrow directivity angle type provides illumination with a high level of directivity, so the crease area does not transmit light and is captured as a sharp, black line. Generating a strong contrast between the crease and the surrounding area enables highly accurate inspection.
Imaging example
Diffusion type
The crease line appears blurred, with little contrast compared to the surrounding area.
Narrow directivity angle type
The crease line appears sharply in black, providing clear contrast with the surrounding area.
Products Used
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Sensing LED Backlight
OPF Series
Increased brightness compared with conventional models (narrow directivity angle type: 4×, diffuse type: 2.5×)
Application Examples for Pharmaceutical/Cosmetics
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