Patent ID: 11906446
Assignee: HONDA MOTOR CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 0:
1. A method of inspecting a surface, comprising detecting a presence or absence of a defect derived from a surface irregularity part or an internal gap of a planar inspection object to be conveyed in a predetermined direction, using a change in intensity of inspection light,
the inspection light including at least two inspection lights that are parallel to a surface of the inspection object in a side view of the inspection object and pass over the surface of the inspection object or through the inspection object in a direction intersecting the conveyance direction in a plan view of the inspection object,
the two inspection lights being non-parallel to each other in the plan view,
the method further comprising specifying a position where the defect is present in a plane on the surface of the inspection object from coordinates in the conveyance direction specified by using a timing at which the intensity of the inspection light changes, and coordinates in a direction orthogonal to the conveyance direction specified by using a difference in timings at which the intensity of the two inspection lights changes.