| 摘要 |
<P>PROBLEM TO BE SOLVED: To evenly illuminate the whole inspection area while the work distance between an optical disk and an image pickup unit is secured to some extent. <P>SOLUTION: When a transparent area (an inspection area 308) on the inner peripheral side of a sticking type optical disk 122 is illuminated by using a ring illuminator 301 and picked up by an image pickup device 203 to inspect adhesive spreading quality of the inspection area 308, respective parts are set so that the positional relation of the inner diameter S1 of the inspection area, the outer diameter S2 of the inspection area, the inner diameter L1 of an illumination part of the ring illuminator 301, the outer diameter L2 of the illumination part of the ring illuminator 301, the distance LD between the ring illuminator 301 and the optical disk 122 and the distance HD between a first principal point position H1 of the image pickup device 203 and the optical disk 122 satisfies S2(1-LD/HD)<L1<S1(1+LD/HD)L2>S2(1+LD/HD). Thereby, the shadow of the ring illuminator is not reflected in the inspection area 308 and the whole inspection area 308 can be evenly illuminated. <P>COPYRIGHT: (C)2004,JPO |
