| 摘要 |
When a tire inner surface is imaged with a portion of an imaging device inserted into an opening of a tire, the imaging device including a light source, a mirror, and a camera and being configured so that the mirror revolves around a rotation shaft while an orientation of a surface of the mirror changes, the mirror is set in an imaging position by being revolved around the rotation shaft to be inserted into a tire cavity region. Thereafter, the tread inner surface of the tire is scanned with slit light by being irradiated with the slit light. During the scanning with the slit light, a line irradiation region on the tread inner surface formed through the irradiation of the slit light is imaged via the mirror by the camera from a direction tilted with respect to the tire circumferential direction, and image data is output. When the mirror is inserted into the tire cavity region, the rotation amount of the rotation shaft is set according to the outer diameter of the tire so that the tilt angle of the imaging of the camera is within an acceptable range. |
