公开(公告)号：DE68912542T2

公开(公告)日：1994-06-30

申请号：DE68912542

申请日：1989-11-27

Applicant: IBM

Inventor： FUKUNAGA SEIJI ,  NAKAMURA TAKASHI ,  ONO HIROYUKI

IPC: G01P3/44 ,  G01P3/489 ,  G11B19/247 ,  G11B19/28

Abstract: A pulse generator includes an optical or magnetic pattern (8) provided on a rotor (4) of a motor and a sensor (12) detecting the movement of the pattern due to the rotation of the motor. Means (18, 20, 22) are provided for generating pulses following the rotational characteristics, such as wow and flutter components of the motor and for eliminating sensor errors and pattern errors.

公开(公告)号：DE68912542D1

公开(公告)日：1994-03-03

申请号：DE68912542

申请日：1989-11-27

Applicant: IBM

Inventor： FUKUNAGA SEIJI ,  NAKAMURA TAKASHI ,  ONO HIROYUKI

IPC: G01P3/44 ,  G01P3/489 ,  G11B19/247 ,  G11B19/28

Abstract: A pulse generator includes an optical or magnetic pattern (8) provided on a rotor (4) of a motor and a sensor (12) detecting the movement of the pattern due to the rotation of the motor. Means (18, 20, 22) are provided for generating pulses following the rotational characteristics, such as wow and flutter components of the motor and for eliminating sensor errors and pattern errors.

公开(公告)号：JPH02156467A

公开(公告)日：1990-06-15

申请号：JP30989088

申请日：1988-12-09

Applicant: IBM JAPAN

Inventor： FUKUNAGA SEIJI ,  NAKAMURA TAKASHI ,  ONO HIROYUKI

IPC: G01P3/44 ,  G01P3/489 ,  G11B19/247 ,  G11B19/28

Abstract: PURPOSE:To obtain a pulse following the rotational characteristic of a motor by eliminating the error components of a sensor and a pattern by mounting a light pattern on the shaft of the motor to rotate a magnetic disk, detecting it by an optical sensor, and inputting the output of the sensor to a sector boundary reference generator and a light pattern error generator. CONSTITUTION:A light pattern label 8 on which a black pattern 8a and a white pattern 8b are printed alternately in a radius direction is stuck on the rotor 6 of a spindle motor 4 which drives the magnetic disk 2. The label 8 is irradiated with light from a light source 10, and reflected light from the label is inputted to the optical sensor 12, and the pulse following the rotational characteristic of the motor 4 is outputted from the sensor. Here, the number of patterns 8a and 8b in a circumferential direction is decided at the number sufficiently following the wow component and the flatter component of the motor 4. Afterwards, the output of the sensor 12 is inputted to the sector boundary reference generator 14 and the light pattern error generator 16, and results are sent to first and second counting logic circuits 18 and 22, and a sector boundary signal 24 is sent from the circuit 22.