Title :
High-density magnetic recording tracking method using a laser diode [and dual-stage actuator]
Author :
Akagi, K. ; Nakao, T. ; Miyamura, Y. ; Munemoto, T. ; Mori, K.
Author_Institution :
Hitachi Ltd., Tokyo, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
A novel tracking technology for achieving high track density over 10 k tracks-per-inch (TPI) is developed. Two key technologies are incorporated. One is the application of optical disk technology to a magnetic disk to obtain a high-quality servo signal with a trackwidth 1.5 to 2 μm. The other is the installation of a dual-stage actuator using a piezoelectric device for the fine actuator to gain higher servo performance in a bandwidth greater than 1 kHz. The authors describe the design of the optical servo system for the track pitch 1.5 μm, 17 kTPI, and experimental results including a comparison of magnetic heads
Keywords :
electric actuators; hard discs; magnetic recording; measurement by laser beam; piezoelectric devices; position measurement; servomechanisms; tracking; design; dual-stage actuator; high-density magnetic recording; high-quality servo signal; laser diode; magnetic disk; magnetic heads; optical disk technology; optical servo system; piezoelectric device; servo performance; track pitch; tracking method; Bandwidth; Diode lasers; Magnetic heads; Magnetic recording; Optical design; Optical recording; Performance gain; Piezoelectric actuators; Piezoelectric devices; Servomechanisms;
Journal_Title :
Magnetics, IEEE Transactions on
