| 摘要 |
Disk cutting apparatus, in which a plurality of beams are generated simultaneously from a laser light source by means of an ultrasonic light deflector, of which beams enter a common focussing lens; the light deflector is so controlled that each spot of the plurality of beams is located on the surface of the disk exactly with a desired track pitch in the radial direction of the disk and when the disk is rotated once a plurality of coaxial tracks are formed simultaneously.
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