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OPT4001: The reflective foreign objects in the OPT4001

Part Number: OPT4001

Tool/software:

Hi,

We have got the OPT4001YMR in our production line, and our IQC feedback that there are some reflective foreign objects in the back of the device when we use the microscope;

Plesae refer to below picture and advsie if this is normal or not, thanks.