JPH04132661U - magnetic head drive device - Google Patents

Abstract

(57) [Summary] [Structure] A slider that holds the pulse motor movably in the horizontal direction and a permanent magnet that attracts the pulse motor in the direction of the shaft of the spindle are provided. [Effect] The attitude of the magnetic head can always be maintained in a stable state.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to magnetic head drive devices, particularly those used in the manufacture of magnetic disk drives. The present invention relates to a magnetic head drive device used in a servo track writer.

0002

[Conventional technology]

FIG. 2 is a perspective view showing an example of a conventional magnetic head drive device.

0003 Conventional magnetism used in servo track writers used in manufacturing magnetic disk drives As shown in FIG. 2, the head drive device has a rotation center at one end and approximately 45 mm at the other end. The positioner arm 21 has an arcuate portion of 100 degrees, and the positioner arm 21 is rotating. A holder 23 is fixed near the core and has a magnetic head 22 attached to its tip, and a base is placed above and below. A spindle 24 that has a ring and rotates the positioner arm 21 precisely, and a cover. It is connected concentrically to the shaft 25 of the spindle 24 via a coupling ring 26 and is positioned in a positive position. A rotary encoder 27 that precisely measures the rotation angle of the rotation arm 21 and a position The output shaft 31 is provided on the outside of the positioner arm 21 and its output shaft 31 is shaped like an arc of the positioner arm 21. A high-resolution pulse motor is installed with a small gap between the side surface (arc surface) 28 of the 32, and a positioner arm whose one end is wound around the output shaft 31 of the pulse motor 32. 21, extending in one direction of the side surface of the arcuate surface 28 and fixing the other end to the arcuate surface 28. A thin plate-shaped first belt 29 is wrapped around the output shaft 31 of the pulse motor 32 at one end. A thin belt extending in the opposite direction to the first belt 29 and having the other end fixed to the arcuate surface 28. A plate-shaped second belt 30 is provided, and the arcuate surface 28 of the positioner arm 21 and Vibration occurs between the first belt 29, the second belt 30, and the output shaft 31. They are arranged so that there are no gaps to prevent this from occurring. The magnetic head 22 This is for writing servo information on the air disk, and the positioner arm 21 and and high-resolution pulse motor 32 and first belt 29 and second belt 3 0 constitutes a deceleration mechanism, and the rotary encoder 27 controls the rotation of the positioner arm 21. Detect the rotation angle of the rotation center.

0004 The operation of the magnetic head drive device configured in this way begins by driving the pulse motor 32. to rotate the output shaft 31. This allows the first belt 29 and the second belt to The arm 30 is wound around or unwound around the output shaft 31, and the positioner arm 21 is rotated around the center of rotation. Performs a rotational movement (arc movement) around the part. The rotary encoder 27 The rotation angle at the rotation center of the positioner arm 21 at this time is measured.

[0005]

[Problem that the idea aims to solve]

In the conventional magnetic head drive device as described above, the arcuate surface of the positioner arm 21 28, the arcuate surface 28 of the positioner arm 21 and the first belt 29 Because it is installed so that there is no gap between the second belt 30 and the output shaft 31. , at the end of the left and right rotational movement of the positioner arm 21, the output shaft 31 By wrapping the first belt 29 or the second belt 30, the position can be adjusted. The naarm 21 has a dimension equal to the belt thickness multiplied by the number of belt wraps during rotation. A force acts to increase the distance between the core and the output shaft 31, and the positioner arm 21 or This has the disadvantage that the output shaft 31 is tilted, making the position of the magnetic head 22 unstable. ing.

[0006]

[Means to solve the problem]

The magnetic head drive device of the present invention has a rotation center at one end and an angle of about 45 degrees at the other end. a positioner arm having an arc-shaped portion; and the rotation center portion of the positioner arm. A holder with a magnetic head attached to the tip and bearings on the top and bottom. and a spindle that rotates the positioner arm, and a coupling that rotates the positioner arm. The positioner arm is connected concentrically to the shaft of the spindle and measures the rotation angle of the positioner arm. A rotary encoder is installed on the outside of the positioner arm, and its output shaft is A pad is disposed with a slight gap from the side surface of the arcuate portion of the positioner arm. a pulse motor, one end of which is wound around the output shaft of the pulse motor, and the pulse motor is positioned at the position; The side surface of the arcuate portion of the naarm extends in one direction and the other end is connected to the arcuate portion. a first belt fixed to the side surface of the motor, and one end wrapped around the output shaft of the pulse motor. The belt extends in the opposite direction to the first belt, and the other end is attached to the side surface of the arcuate portion. A second belt fixedly holds the lower end of the pulse motor and the spindle. a slider movable horizontally in the direction of the shaft; and a slider that is movable horizontally in the direction of the shaft; The output shaft of the pulse motor is aligned with the side surface of the arcuate portion of the spindle. and a permanent magnet that presses in the direction of the shaft with a predetermined pressure.

[0007]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings.

[0008] FIG. 1 is a perspective view showing a first embodiment of the present invention.

[0009] The embodiment of FIG. 1 has a center of rotation at one end and an approximately 45 degree arc at the other end. a positioner arm 1 that is fixed near the center of rotation of the positioner arm 1; A holder 3 with a magnetic head 2 attached to the end, and a positioner with bearings on the top and bottom. A spindle 4 that rotates the spindle 1 and a spindle 4 that rotates the spindle 4 through a coupling 6. A rotary engine that is concentrically connected to the shaft 5 and measures the rotation angle of the positioner arm 1. The coder 7 is provided outside the positioner arm 1 and its output shaft 11 is connected to the positioner arm 1. The high-resolution part is arranged with a slight gap between the side surface (arc surface) 8 of the arc-shaped part of the arm 1. a pulse motor 12 with one end wrapped around the output shaft 11 of the pulse motor 12, and a port with one end wound around the output shaft 11 of the pulse motor 12. Extend in one direction of the arcuate surface 8 of the positioner arm 1 and fix the other end to the arcuate surface 8 A thin plate-shaped first belt 9 is wrapped around the output shaft 11 of the pulse motor 12 at one end. A thin plate-shaped belt extending in the opposite direction to the first belt 9 and having the other end fixed to the arcuate surface 8 The second belt 10 and the lower end of the pulse motor 12 are held, and The slider 14 is movable horizontally in the direction of the shaft 5, and the slider 14 is sucked and The output shaft 11 of the russ motor 12 is directed toward the shaft 5 of the spindle 4 with respect to the arcuate surface 8. It is equipped with a permanent magnet 13 that presses in the direction with a predetermined pressure.

0010 The operation of the magnetic head drive device configured in this way begins with driving the pulse motor 12. to rotate the output shaft 11. This allows the first belt 9 and the second belt to 10 is wound or unwound around the output shaft 11, and the positioner arm 1 rotates around the center of rotation. Performs rotational movement (arc movement) around the center. The rotary encoder 7 at this time The rotation angle at the rotation center of the positioner arm 1 is measured. positioner arm 1 rotates, one belt is wrapped around the output shaft 11 and the other belt outputs the output. It is unwound from the shaft 11. Therefore, the diameter of the one wrapped around the output shaft 11 is larger. As a result, the distance between the output shaft 11 and the rotation center of the positioner arm 1 changes. The rider 14 is attracted by the permanent magnet 13 and is horizontal in the direction of the shaft 5 of the spindle 4. At this time, the pulse motor 12 is moved together with the slider 14. The output shaft 11 is brought into contact with the arcuate surface 8 with a predetermined pressure. by this The first belt 9 and the second belt 10 are always in contact with the arcuate surface 8 without any gaps to maintain the point. Rotate the positioner arm 1 correctly.

[0011]

[Effect of the idea]

As explained above, the magnetic head drive device of the present invention operates the pulse motor horizontally. A slider that holds the pulse motor movably in the direction of the spindle and a pulse motor By installing a permanent magnet that attracts the magnetic head in the direction, the posture of the magnetic head can be kept stable at all times. It has the effect of being able to maintain the state.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a conventional magnetic head drive device.

[Explanation of symbols]

1.21 Positioner arm 2.22 Magnetic head 3.23 Holder 4.24 Spindle 5.25 Shaft 6.26 Coupling 7.27 Rotary encoder 8.28 Arc surface 9/10/29/30 Belt 11・31 Output shaft 12・32 Pulse motor 13 Permanent magnet 14 Slider

Claims (1)

[Scope of utility model registration request] Claim 1: Having a center of rotation at one end and approximately 45 mm at the other end.
a positioner arm having a circular arc-shaped portion; a holder fixed near the center of rotation of the positioner arm and having a magnetic head attached to its tip; a spindle having upper and lower bearings for rotating the positioner arm; a rotary encoder that is concentrically connected to the shaft of the spindle via a ring and measures the rotation angle of the positioner arm; and a rotary encoder that is provided on the outside of the positioner arm so that its output shaft is slightly parallel to the side surface of the arcuate portion of the positioner arm. A pulse motor arranged with a certain gap maintained,
a first belt having one end wrapped around the output shaft of the pulse motor, extending in one direction of the side surface of the arcuate portion of the positioner arm, and having the other end fixed to the side surface of the arcuate portion; a second belt that is wrapped around the output shaft of the pulse motor, extends in the opposite direction to the first belt, and has its other end fixed to a side surface of the arcuate portion; and a second belt that holds the lower end of the pulse motor. a slider that is horizontally movable in the direction of the shaft of the spindle; and a slider that is attracted to the slider to position the output shaft of the pulse motor in a predetermined direction in the direction of the shaft of the spindle with respect to a side surface of the arcuate portion. A magnetic head drive device comprising: a permanent magnet that presses with a pressure of .