ELECTRO-OPTICAL SERVO TRANSDUCER HEAD

摘要

A read/write electromagnetic transducer slider head (70) includes a monolithic semiconductor chip (68) provided with an LED and a light detector. A spherical lens (66) is located in a tapered hole (72) in the head, for focussing light from the LED onto the surface of a magnetic data storage disk (74), and for collecting reflected light and for directing it to the light detector. The LED light detector and lens are centrosymmetric about their axis. Servo positioning marks on the disk surface are sensed, and the resulting servo signal is used to correct the position of the head relative to the disk.