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

Claim 6:
7. A surface inspection apparatus configured to detect 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 surface inspection apparatus comprising:
a conveyor capable of conveying the planar inspection object in the predetermined direction;
a first light emitter and a second light emitter capable of emitting at least two inspection lights so as to be non-parallel to each other in a plan view, the at least two inspection lights being parallel to a surface of the inspection object in a side view of the inspection object and passing over the surface of the inspection object or through the inspection object in a direction intersecting the conveyance direction in the plan view of the inspection object;
a light receiver configured to detect a change in intensity of each of the inspection lights; and
a coordinate specifier that specifies 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.