JP4403213B2 - Head clamp device for disk characteristic evaluation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk, which is a key component of a hard disk device, and a head clamp device for a disk characteristic evaluation apparatus that measures electromagnetic conversion characteristics of a magnetic head. More specifically, the present invention relates to a head clamp device used in a test apparatus that positions a magnetic head at a predetermined track position on a magnetic disk and measures recording / reproduction characteristics.
[0002]
[Prior art]
With the recent improvement in characteristics of hard disk drives, it is necessary to improve the performance of evaluation devices that measure the electromagnetic conversion characteristics of magnetic disks and magnetic heads that are key components.
[0003]
In particular, as the track density increases, the core width of the magnetic head tends to become narrower. Therefore, in order to perform accurate measurements, it is essential to improve the track positioning accuracy of the evaluation device itself. Alternatively, the positioning accuracy of the magnetic head is improved by combining a fine movement stage using a piezo element on a coarse movement stage driven by an ultrasonic motor or the like.
[0004]
In the conventional disk characteristic evaluation apparatus, a motor housing having a spindle motor is provided on the upper surface of the base, and a disk clamp that is driven to rotate by the spindle motor is provided on the upper part of the motor housing. The magnetic disk is configured to be clamped / unclamped at the upper end.
[0005]
A coarse movement stage for positioning the magnetic head in the uniaxial direction is provided on the upper surface of the base so as to be movable and adjustable in the uniaxial direction at a position adjacent to the disk clamp. A head loader is provided on the upper surface of the coarse movement stage so as to be movable in a semicircular shape. A head clamp having a pair of magnetic heads composed of a down face and an up face is detachably provided on the head loader. ing. The magnetic head is provided at the tip of the suspension clamped at the front end of the head clamp.
[0006]
The down face and up face head clamps are mounted substantially symmetrically in the vertical direction, and are controlled to move up and down independently, and the magnetic head is provided so as to move forward and backward so as to sandwich the magnetic disk from the vertical direction. Yes.
[0007]
Referring to FIGS. 8 and 9, the head clamp 101 is detachably attached to the head loader described above by a dovetail groove 103, and the head clamp body 105 is provided with a magnetic head 107 for a ramp load structure at the tip. The suspension 109 is detachably clamped. The suspension 109 is provided integrally with the base plate 111, and a hole 113 is provided at the base of the base plate 111. The ramp load structure magnetic head 107 has a ramp load projection 115 at the tip of the suspension 109.
[0008]
In addition, a clamp shaft 117 is movably penetrated through a substantially central portion of the head clamp main body 105, and a three-way claw portion 119 that protrudes in three directions and can be inserted into the hole 113 of the base plate 111 at one end of the clamp shaft 117. A push button 121 is provided at the other end of the clamp shaft 117. The clamp shaft 117 is biased by a spring 123 in a direction in which the three-way claw portion 119 clamps the base portion of the suspension 109 on the upper surface of the head clamp body 105 and always presses it.
[0009]
Therefore, when the push button 121 is pushed up against the urging force of the spring 123 to allow the three-way claw 119 to pass through the hole 113 of the base plate 111 and then the push button 121 is released, the base plate 111 is attached to the spring 123. The three-way claw portion 119 is positioned at a predetermined position by the force.
[0010]
If the magnetic head 107 is unstable when the magnetic head 107 is loaded by the disk characteristic evaluation apparatus, the protrusion 115 of the magnetic head 107 comes into contact with the magnetic disk first, and the magnetic disk In order to stabilize the position of the magnetic head 107 in the vertical direction, a head load device 125 for pressing the tip end side of the suspension 109 is provided at the front end of the head clamp main body 105.
[0011]
As the head load device 125, a bearing portion 127 is provided on the front side surface of the head clamp main body 105, and a head load main body 131 having a presser plate 129 for pressing the suspension 109 is provided on the bearing portion 127. It is provided so as to be rotatable in a direction orthogonal to the extending direction of the suspension 109 via 133. The presser plate 129 is made of a stainless steel thin plate.
[0012]
Further, the head load body 131 is always urged by a spring 135 in a direction to rotate clockwise in FIG. 9, and the rotation operation of the head load body 131 abuts on the front side surface of the head clamp body 105. It is configured to stop at a predetermined position. The suspension 109 is pressed to a predetermined position by the pressing plate 129 at the predetermined stop position.
[0013]
[Problems to be solved by the invention]
Incidentally, in recent years, in the disk characteristic evaluation apparatus, since the head portion including the head clamp 101, the suspension 109, the magnetic head 107, and the like has been miniaturized, in the conventional head load device 125 described above, the suspension 109 is pressed by the holding plate 129. However, there is a problem that the disk characteristic evaluation apparatus having a small head portion cannot be used.
[0014]
For example, since a wiring board (not shown) is provided on the suspension 109, when the width of the suspension 109 is reduced, the presser width is reduced in order to avoid the wiring board by the holding plate 129. Therefore, the circuit board is damaged by the presser plate 129, and the presser plate 129 itself is also small, so that when the force is applied to the base of the presser plate 129, the presser plate 129 is deformed.
[0015]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a head load device that presses down so as to stabilize the position in the vertical direction regardless of whether it is a large type or a miniaturized head. Another object of the present invention is to provide a head clamp device for a disk characteristic evaluation device.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a head clamp device for a disk characteristic evaluation apparatus according to a first aspect of the present invention provides an electromagnetic conversion of at least one of a magnetic disk and a magnetic head while rotating a magnetic disk having a plurality of concentric tracks. A head clamp for positioning the magnetic head at a predetermined track position is provided for evaluating the characteristics. A suspension having the magnetic head at the tip is detachably attached to the head clamp and protrudes forward to the tip of the suspension. In the head clamp device for a disk characteristic evaluation device provided with a protrusion,
A wire base that is movable in the front-rear direction is provided at the front end of the head clamp, and two wire support members are projected in the vertical direction through an interval in which the protrusion can be inserted into the wire base. A wire rod that holds the protrusion of the suspension at a predetermined position in the vertical direction is provided between the support members so as to be tensioned in a substantially horizontal direction.
[0017]
Therefore, when the suspension is attached to the head clamp, the wire base is moved forward in advance. By moving the wire base backward so that the protrusion at the tip of the suspension passes through the space between the wire and the two wire support members, the protrusion is reliably secured in a predetermined position in the vertical direction with the wire. It is pressed down. It is widely applied to both large types and miniaturized heads. In addition, since there is a gap between the wire and the wire base, the suspension protrusion moves away from the wire due to the rotation of the magnetic disk and an air gap is generated between the magnetic head surface and the magnetic disk surface in the actual load state. It will not cause any trouble.
[0018]
According to a second aspect of the present invention, there is provided the head clamp device for a disk characteristic evaluation apparatus according to the first aspect. The head clamp device for the disk characteristic evaluation apparatus according to the first aspect, wherein the wire base is pressed against the protrusion of the suspension by the wire. It is characterized in that it is always urged to the rear side positioned at the position.
[0019]
Therefore, when the suspension is attached to the head clamp, the wire base moves forward against the urging force, but after being attached, the wire base surely returns to the original position by the urging force. The wire does not come off the protrusion when the magnetic head is loaded.
[0020]
According to a third aspect of the present invention, there is provided the head clamp device for a disk characteristic evaluation apparatus according to the first or second aspect, wherein the wire is made of a metal wire. It is.
[0021]
Therefore, by using a thin metal wire as the wire, even if an air gap occurs in the actual load state, the wire does not protrude from the magnetic head surface to the magnetic disk side, so that the disk characteristics can be evaluated stably. Done.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a head clamp device for a disk characteristic evaluation apparatus according to the present invention will be described below with reference to the drawings.
[0023]
Referring to FIGS. 5 and 7, in the disk characteristic evaluation apparatus 1 according to the present embodiment, a surface plate-like base 5 is placed on the upper surface of a control apparatus 3 that controls the drive system of the apparatus. A spindle motor housing 9 having a spindle motor 7 (air spindle) therein is provided on the upper surface of the base 5 as shown in FIG. A disk clamp 11 that is rotationally driven by the spindle motor 7 is provided on the upper part of the spindle motor housing 9, and a magnetic disk 13 is clamped and unclamped at the upper end of the disk clamp 11.
[0024]
Further, on the upper surface of the base 5, coarse movement for positioning the upper and lower magnetic heads 15 in the X axis direction (left and right direction in FIG. 5) at a position adjacent to the disk clamp 11 in the upper direction in FIG. A stage 17 (X stage) is provided, and this coarse movement stage 17 is driven in the X-axis direction via an X-axis ball screw 21 by an ultrasonic motor 19 for driving the X stage.
[0025]
Further, a segment gear 23 is provided on the upper surface of the coarse movement stage 17 so as to be smoothly fixed in parallel with the magnetic disk 13. The segment gear 23 is formed in a semicircular arc shape, and a rack 25 is provided on the outer peripheral edge. It has been.
[0026]
A head loader 29 provided with a head clamp 27 having a pair of magnetic heads 15 consisting of a down face and an up face is provided on the segment gear 23 so as to be movable in a semicircular arc shape. 29 is provided with a pinion 31 that meshes with the rack 25 of the segment gear 23.
[0027]
The pinion 31 is rotated and transmitted through a speed reducer (not shown) by a skew angle motor 33 provided in the head loader 29, meshes with the rack 25 of the segment gear 23, and has a rotation angle along its outer peripheral surface. By performing the rotational movement of 90 °, the head loader 29 rotates and the magnetic head 15 is positioned. In FIG. 5, the position of the upper and lower magnetic heads 15 and the position of the rotation center of the magnetic disk 13 are on the same line in the X-axis direction.
[0028]
On the base side of the head loader 29, as shown in FIGS. 5 and 6, there is provided a piezo actuator 35 for minutely moving the upper portion of the head loader 29 in the X-axis direction.
[0029]
The head clamp 27 includes an upper head clamp 27A and a lower head clamp 27B. The upper head clamp 27A is provided so as to be movable up and down via an upper mounting base 37A. The lower head clamp 27B is a lower mounting base. It can be moved up and down through 37B. Moreover, the upper head clamp 27A and the lower head clamp 27B are detachably attached to the upper mounting base 37A and the lower mounting base 37B by a dovetail dovetail 39.
[0030]
A suspension 43 having a magnetic head 15A (down face) at the tip is clamped to the front end of the upper head clamp 27A via a clamp 41, and the clamp 43 is connected to the front end of the lower head clamp 27B. A suspension 43 having a magnetic head 15B (up face) at its tip is clamped.
[0031]
The vertical movement device for the head clamp 27 is built in the head loader 29. The upper and lower head clamps 27A and 27B are independently controlled for vertical movement, and each magnetic head 15 moves the magnetic disk 13 from the vertical direction. It is possible to move forward and backward so as to sandwich.
[0032]
In the disk characteristic evaluation apparatus 11 described above, when evaluating the characteristics of each magnetic head 15, after the magnetic disk 13 is set to a predetermined rotation speed by the spindle motor 7, the coarse movement stage 17 is, for example, X in the track width direction. It is sent in the axial direction, and the upper and lower magnetic heads 15 are positioned at predetermined positions.
[0033]
Further, after the skew angle, which is an offset angle with respect to the tangent line in the track direction, is set, each magnetic head 15 at the tip of the HGA is loaded by the head loader 29 so as to have a predetermined flying height. That is, the upper and lower head clamps 27A and 27B are adjusted to move up and down.
[0034]
Next, in the track profile characteristic evaluation and the error rate characteristic evaluation (bathtub characteristic) in which the characteristic evaluation is performed while finely moving the track position of the magnetic head 15 in the track width direction, each magnetic head 15 is moved by a small amount by the piezoelectric actuator 35. The positioning resolution of the magnetic head 15 is improved by performing the measurement while only offsetting.
[0035]
Referring to FIGS. 1 and 2, the lower head clamps 27A and 27B have a substantially symmetrical structure as described above, and are structurally similar. Therefore, only the “head clamp 27” will be described in detail.
[0036]
A ramp load structure magnetic head 15 is provided at the front end of the suspension 43, and the rear end of the suspension 43 is provided integrally with the base plate 45. The ramp load structure magnetic head 15 has a ramp load projection 47 at the tip.
[0037]
The head clamp 27 is provided with a dovetail 39 at the rear end of the insert block 49, and the front end of the insert block 49 is formed in a T-shape on the plane side in the present embodiment and is narrowed at the front end side in this embodiment. The FB mount block 51 having a different shape is integrally provided.
[0038]
A fixture base 53 for attaching the base plate 45 is provided on the upper surface on the base side of the FB mount block 51, and a rear end portion of the base plate 45 placed on the upper surface of the fixture base 53 is clamped. A clamp block 55 having a clamp portion 41 is provided so as to be slidable in the front-rear direction via a guide rail 57.
[0039]
Further, a head load device 59 is provided on the upper surface of the front portion of the FB mount block 51. The head load device 59 will be described in detail. For example, a wire base 61 as a wire base is provided to be slidable in the front-rear direction via a guide rail 63, and the wire base 61 has an L-shaped cross section in the present embodiment. The wire base tensioning spring 65 is always biased in the direction of being pulled rearward, and the vertical piece 67 on the front side of the wire base 61 abuts on the front end of the guide rail 57, thereby causing a predetermined original position. It is provided to stop at.
[0040]
Further, in the state where the wire base 61 is in the above-mentioned original position, for example, the wire support members 69 as two wire support members are positioned on the left and right sides of the ramp load projections 47 from the upper surface of the wire base 61. The upper end of the two wire support members 69 is attached with, for example, a metal wire 71 as a wire rod in a tensioned state in a substantially horizontal direction. That is, it is formed in a gate shape from the two wire support members 69 and the wire 71, and has a structure in which the protrusions 47 can be inserted into the lower side of the wire 71 in FIG. 2.
[0041]
In consideration of the air gap between the magnetic head 15 and the magnetic disk 13 that occurs during actual loading, the wire 71 is preferably a thin wire having a small diameter, for example, a thin wire such as a piano wire having a diameter of 0.1 mm. Although a thing with big intensity | strength is desirable, it is not this limitation.
[0042]
With the above configuration, the base plate 45 integrated with the suspension 43 is placed on the upper surface of the fixture base 53 in a state where the clamp block 55 is slid rearward (rightward in FIGS. 1 and 2). When the rear end portion of the base plate 45 is clamped by the clamp block 55 by sliding forward (leftward in FIGS. 1 and 2), the tip end side of the suspension 43 is slightly lifted upward.
[0043]
In a state where the wire base 61 is moved forward (leftward in FIGS. 1 and 2) against the urging force of the wire base pulling spring 65, the tip side of the suspension 43 is pushed downward by a human hand. . When the wire base 61 is moved to the rear side (rightward in FIGS. 1 and 2) by the spring 65 by weakening the force pulling the wire base 61 forward, the ramp load projection 47 is below the wire 71. When the wire base 61 is moved while being pushed down so as to pass through and stopped at a predetermined position, the protrusion 47 is pressed downward by the wire 71 as shown in FIG. 3, so that the suspension 43 is stabilized in the vertical direction. It will be in the state.
[0044]
When the suspension 43 is mounted as described above, the wire base 61 reliably returns to the original position by the biasing force of the spring 65, so that the wire 71 does not come off from the protrusion 47 when the magnetic head 15 is loaded.
[0045]
The magnetic head 15 is provided on the upper surface of the suspension 43 in FIG. 3, and the upper surface of the magnetic head 15 is located above the wire 71 (that is, on the surface side of the magnetic disk 13).
[0046]
After the suspension 43 is mounted as described above, the lower head clamps 27A and 27B are mounted on the upper mounting base 37 or the lower mounting base 37.
[0047]
In the actual load state, for example, in the lower head clamp 27B for up-face, when the magnetic disk 13 is rotated, the protrusion 47 of the suspension 43 is separated from the wire 71 and magnetically connected to the magnetic head 15 as shown in FIG. A normal air gap G is generated between the disks 13, and reading / writing is performed. Incidentally, the gap A between the protrusion 47 and the wire 71 is about 0.1 mm, and the air gap G between the magnetic head 15 and the magnetic disk 13 is actually about several tens of nm (1 nm = 1 × 10 ⁻⁶ mm). Become.
[0048]
As described above, the head load device 59 of the present invention can be applied in a wide range to a head portion such as a large type suspension 43 and a miniaturized head portion, and the vertical position of the magnetic head 15 is ensured. It is pressed by the wire 71 so as to be stable. In addition, since there is a gap below the wire 71, there is no problem even if the protrusion 47 of the suspension 43 is separated from the wire 71 when an air gap G is generated between the magnetic head 15 and the magnetic disk 13 in an actual load state. Don't come.
[0049]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change.
[0050]
【The invention's effect】
As can be understood from the description of the embodiments of the invention as described above, according to the invention of claim 1, when the suspension is mounted on the head clamp, the wire base is moved in the forward direction in advance. By positioning the protrusion at the tip so as to pass through the gap between the wire and the two wire support members, and moving the wire base backward, the protrusion is reliably secured in a predetermined position in the vertical direction with the wire. Can be held down. Therefore, it can be widely applied to both the large type and the miniaturized head portion. In addition, since a gap is provided between the wire and the wire base, when the air gap is generated between the magnetic head surface and the magnetic disk surface due to the rotation of the magnetic disk in the actual load state, the protrusion of the suspension is It will not cause any trouble even if you leave the wire.
[0051]
According to the invention of claim 2, when the suspension is attached to the head clamp, the wire base is moved forward against the urging force, but after the attachment, the wire base is securely moved by the urging force. Since it can be returned to the position, the wire rod does not come off from the protruding portion when the magnetic head is loaded and is stable.
[0052]
According to the invention of claim 3, since the wire is made of a thin metal wire, even if an air gap occurs in an actual load state, the wire does not protrude from the magnetic head surface to the magnetic disk side, so that the wire is stable. Disc characteristics can be evaluated.
[Brief description of the drawings]
FIG. 1 is a plan view of a head clamp according to an embodiment of the present invention.
FIG. 2 is a side view of a head clamp according to an embodiment of the present invention.
3 is an enlarged view of a portion II in FIG. 2 when the head is mounted.
4 is an enlarged view of a portion II in FIG. 2 when the head is loaded.
FIG. 5 is a plan view of a disk characteristic evaluation apparatus used in the embodiment of the present invention.
6 is a front view of FIG. 5. FIG.
7 is a left side view of FIG. 5. FIG.
FIG. 8 is a plan view of a head clamp device of a conventional disk characteristic evaluation apparatus.
9 is a right side view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disk characteristic evaluation apparatus 11 Disk clamp 13 Magnetic disk 15A, 15B Magnetic head 27, 27A, 27B Head clamp 29 Head loader 43 Suspension 45 Base plate 47 Protrusion part 51 FB mount block 53 Fixture base 59 Head load apparatus 61 Wire base (wire material) base)
65 Spring 69 Wire support member (wire support member)
71 wire

Claims (3)

A head clamp for positioning the magnetic head at a predetermined track position so as to evaluate electromagnetic conversion characteristics of at least one of the magnetic disk and the magnetic head while rotating the magnetic disk having a plurality of concentric tracks; In the head clamp device for a disk characteristic evaluation apparatus, a suspension having a tip provided at the tip thereof is detachably provided on the head clamp, and a protrusion protruding forward is provided at the tip of the suspension.
A wire base that is movable in the front-rear direction is provided at the front end of the head clamp, and two wire support members are projected in the vertical direction through an interval in which the protrusion can be inserted into the wire base. A head clamp device for a disk characteristic evaluation apparatus, characterized in that a wire rod that presses the protrusion of the suspension at a predetermined position in the vertical direction is provided between support members in a substantially horizontal direction. 2. The head clamp device for a disk characteristic evaluation apparatus according to claim 1, wherein the wire base is constantly urged to the rear side where the wire rod is positioned at the original position where the protrusion of the suspension should be pressed by the wire. The head clamp device for a disk characteristic evaluation apparatus according to claim 1 or 2, wherein the wire is made of a metal wire.

Images