Patent ID: 11959863
Assignee: OMRON CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A sheet inspection device comprising:
a first light source configured to irradiate a first surface of a sheet-shaped inspection target material;
a first inspector configured to detect reflected light obtained by the first surface of the inspection target material reflecting the light emitted by the first light source;
a second light source configured to irradiate a second surface of the inspection target material;
a second inspector configured to detect reflected light obtained by the second surface of the inspection target material reflecting the light emitted by the second light source; and
a detection determination processor configured to detect and determine a defect of the inspection target material based on a signal input from the first inspector and/or a signal input from the second inspector,
wherein the first inspector is disposed at a position where, when the inspection target material has a hole, light emitted from the second light source and transmitted through the hole is detectable, and
the detection determination processor detects and determines the hole as the defect of the inspection target material in a case where the first inspector detects the light emitted from the second light source and transmitted through the hole.