出版社：The Institute of Image Information and Television Engineers
摘要：The surface of a hard disk is extremely flat so that a large amount of data can be stored at high density. This high degree of flatness, however, tends to cause sticking between the disk and the head when the disk starts and stops moving, and this reduces the reliability of the hard disk device. To solve this problem, we have developed an ultrasonic vibration spindle that vibrates the disk when it is turned on and off. We used this spindle in an ultrasonic levitation experiment, and found that by vibrating the spindle in a ring-shape vibration mode. We could keep the head and the disk apart and drastically reduce the friction coefficient between them. Further, by placing a reflection plate in the space above the hard disk at an appropriate plate-disk distance, we could increase the acoustic power. This means that the spindle can be made much smaller.
