JPH0778306A - Hard disk device for separable recording and reproducing - Google Patents

Abstract

PURPOSE:To secure off-track margin and to reduce the error by minimizing the space between a thin film inductive head of composite head and an MR head caused by a head slider skew with respect to the relative position of the track width of both heads. CONSTITUTION:The geometrical center in the direction of track width of the thin film inductive head 2 and the offset amount in the direction of recording track width of the MR head 10 are worthy of attention. For this offset amount, an angle offset value P is used which is substantially of the sum of Sin(P1) when a yaw angle at the innermost peripheral track is P1 and Sin(P2) when a yaw angle at the outermost peripheral track is P2, and further the amount is made to coincide with S.P which is the amount multiplied by the separating distance S between both heads. At this time, the off-track between both heads brought from the head slider skew is minimized, then the off-track margin is made sufficient and the error rate of the device is reduced, thereby the hard disk device with a satisfied throughput is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive, and more particularly to a recording / reproducing separated type composite head in which a writing operation by a thin film inductive head and a reproducing operation by an MR (magnetoresistive effect) head are separated and combined. Relates to a hard disk device.

[0002]

2. Description of the Related Art Conventionally, in a high-density hard disk drive, a combination of a thin film inductive head for reading and writing and a thin film magnetic disk including a cobalt alloy type magnetic film having a large coercive force has been used to increase the recording density. Has been done. The principle of the combined recording and reproduction by this head medium is to apply a high-frequency recording current to the thin film inductive head at the time of recording to record digital information on the thin film magnetic disk, and at the time of reproduction, hold the magnetization of the thin film magnetic disk. Generally, the information is read from the waveform of the current flowing through the head by the inductive action generated by the pattern.

On the other hand, with the progress of high-density recording, in the method using the thin film inductive head alone as described above, the limit in high density has become clear. That is, in order to obtain a sufficient reproduction signal level, it is necessary to increase the number of turns of the head coil due to the high frequency recording accompanying the high density recording, whereas in the writing process by the same head, the number of turns is increased. This is because an increase in inductance and the like due to the increase becomes an obstacle for improving frequency characteristics.

Therefore, for higher density recording and reproduction,
Head conditions required for writing and reproducing are contradictory conditions. Therefore, in order to sufficiently satisfy the functions of writing and reading, a so-called recording / reproducing separated type head that uses a recording / reproducing separated head is used. Is becoming. As such a recording / playback separation type head,
A so-called composite type head is generally used in which a conventional thin film inductive head is optimized in a write mode, and an MR (magnetoresistive effect) head for optimizing a read function is arranged near the head.

As described above, it is necessary for the high-density recording hard disk in the future to simultaneously achieve the performance required for the recording / reproducing head by the separate type head.

On the other hand, from the viewpoint of the device system, a compact and high-speed hard disk device is required. In the current mainstream small-sized hard disk drive having a 3.5-inch form factor or less, therefore, a rotary-type positioning mechanism that can reduce equivalent inertia is generally used as a head positioning mechanism. In a hard disk drive having such a rotary-type positioning mechanism, since the head access locus has an arc shape, from the viewpoint of track geometry, there is a so-called yaw, which is a skew with respect to the recording track of the magnetic head slider from the inner circumference to the outer circumference. Horns occur. As this yaw angle increases, the effective track width decreases, and the flying height of the magnetic head slider that flies above the magnetic disk decreases due to the principle of the air bearing. Therefore, it is considered that a desirable limit is about 15 ° to 20 °.

How the yaw angle is set for the recording track on the magnetic disk is determined from the recording / reproducing characteristics between the head media and the flying characteristic of the magnetic head slider as described above. In the case of performing a contact start / stop at the time of start / stop, which is common in hard disks in recent years, it is considered that the yaw angle of the magnetic head slider in the contact start / stop area is as small as possible in terms of tribology. The maximum yaw angle as described above is related to the flying height design,
Often given at the outermost track.

[0008]

Although it is a recording / reproducing separated type magnetic head which is considered to be desirable to be adopted from the viewpoint of high density, when it is used in an actual small hard disk of 3.5 inches or less. There are some challenges. The largest of them is a problem caused by the physical distance between the recording head and the reproducing head, which is different from the case of the conventional hard disk device having only the thin film inductive head.

First, since the recording gap position and the reproducing position are separated from each other by a level of approximately 10 μm, an error occurs in the time axis position from the rotation synchronization information provided on the track. . In a general high-density hard disk, the bit length is 1 μm or less, so the distance between the two heads cannot be ignored, and some correction or adjustment algorithm is required.

A further serious problem is off-track at the time of recording / reproducing, which is caused by the yaw angle on the device track geometry described above. In the case of the conventional thin film inductive head alone, the on-track condition is constant during writing and reading on any track, so the on-track position fixed by the servo system does not change during recording and reproduction. , For example, when repeating the recording / reproducing operation in consecutive sectors,
There is no need to move the head. However, since the recording / reproducing separated type head has a distance between the recording and reproducing heads, the on-track position between recording and reproducing differs especially under the condition that the yaw angle becomes large. In other words, the servo system has to perform positioning on the same target recording track with respect to dedicated heads for recording and reproduction, respectively. For that purpose, at least it must be clear before the head access command whether to write or read to the target track.

This problem is caused in the device controller by
A function for identifying them may be provided, but when performing continuous write and read operations on the same track,
It is necessary to perform positioning again, and when this off-track is large, it is difficult to correct the off-track in time, which causes an increase in error or a decrease in throughput.

Further, in the read / write operation for the sector on the track, the yaw angle causes
Off-track between the thin film inductive head and the MR head causes a problem in sector identification. That is, while the head for reproducing data is always the MR head,
Since writing is performed by the thin film inductive head, it is necessary to immediately perform recording in the data field after reading the adjacent recording field, ie, the ID field, by the MR head. At this time, when the yaw angle is large, the magnetic center of the MR head and the magnetic center of the thin film inductive head, that is, the geometric center, are offset, so an ID field for identifying the target cylinder, head number, and sector number. Must be accurately read, and for that reason, minimizing the offset amount is a problem.

However, if the offset amount is simply minimized in the outermost track where the yaw angle is generally the maximum, the offset in the track width direction of the ID field with respect to the data field becomes large,
This time, it becomes difficult to recognize the ID and reproduce the data when reading.

As another means for minimizing the off-track due to such a yaw angle, the distance between the MR head and the gap of the thin film inductive head is designed to be as small as possible. However, this distance also has a lower limit in order to improve the recording characteristics of the thin film inductive head, the shield characteristics of the MR head, and the like. Particularly, the higher the track density, the more remarkable the off-track amount in the ID field. It will be

It is an object of the present invention to minimize the off-track between recording and reproducing operations due to the yaw angle and sacrifice the device track capacity regardless of the distance between the thin film inductive head and the MR head. It is an object of the present invention to provide a hard disk device having a composite head structure that can minimize the off-track without doing so.

[0016]

According to the present invention, a composite type head having a thin film inductive head and an MR (magnetoresistive effect) head integrated is mounted on a magnetic head slider, which is rotary supported and fixed on a base. A recording / reproducing separated type hard disk device having a head positioning mechanism rotatable about a pivot and having one or more thin film magnetic disks fixed on a rotating spindle, and these constituent parts hermetically fixed by a housing. The geometric center of the thin film inductive head in the recording track width direction when recording digital information on the thin film magnetic disk, and the recording track width when reproducing the digital information recorded on the thin film magnetic disk by the MR head. The offset amount in the track width direction between the magnetic center of the In the magnetic head slider, sin (P1) is the sine of the yaw angle P1 at the innermost track of the recording data area of the thin film magnetic disk, and sin (P2) is the sine of the yaw angle P2 at the outermost track of the recording data area. To the angular offset value P which is substantially 1/2 of the sum of the above, the separation distance S in the track circumferential direction between the recording gap position of the thin film inductive head and the center position in the film thickness direction of the MR head. The offset amount is defined so as to substantially coincide with S · P multiplied by.

In another aspect of the present invention, the angle offset value is substantially 0.175 to 0.342.

In another aspect of the present invention, the thin film inductive head has a geometric center in the recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head records on the thin film magnetic disk. The offset amount in the track width direction with respect to the geometric center in the recording track width direction when reproducing the recorded digital information is the yaw angle of the magnetic head slider at the innermost track of the recording data area of the thin film magnetic disk. Sin (P1) which is the sine of P1 and sin which is the sine of the yaw angle P2 in the outermost track of the recording data area
At an angular offset value P which is substantially 1/2 of the sum of (P2), a value in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction. S multiplied by the separation distance S
The offset amount is defined by S · P + H which is obtained by adding an amount H, which is substantially 1/4 of the MR film height viewed from the ABS (bearing surface) surface of the MR head, to P. .

According to another aspect of the present invention, the thin film inductive head has a geometric center in the recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head records on the thin film magnetic disk. The offset amount in the track width direction with respect to the geometric center in the recording track width direction when reproducing the recorded digital information is the yaw angle of the magnetic head slider at the innermost track of the recording data area of the thin film magnetic disk. Sin (P1) which is the sine of P1 and sin which is the sine of the yaw angle P2 in the outermost track of the recording data area
At an angular offset value P which is substantially 1/2 of the sum of (P2), a value in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction. S multiplied by the separation distance S
An amount H, which is substantially 1/4 of the height of the MR film viewed from the ABS surface of the MR head, is subtracted from the amount represented by S · P to obtain S · P−H. The offset amount is specified.

In another aspect of the present invention, the thin film inductive head has a geometrical center in the recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head records on the thin film magnetic disk. The offset amount in the track width direction with respect to the geometric center in the recording track width direction when reproducing the recorded digital information is the yaw angle of the magnetic head slider at the innermost track of the recording data area of the thin film magnetic disk. Sin (P1) which is the sine of P1 and sin which is the sine of the yaw angle P2 in the outermost track of the recording data area
At an angular offset value P which is substantially 1/2 of the sum of (P2), a value in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction. S multiplied by the separation distance S
With respect to P, the amount H that is substantially 1/4 of the MR film height viewed from the ABS surface of the MR head is the offset amount S
-Has a composite type head formed to be substantially equal to P.

[0021]

In the recording / reproducing separated type hard disk device of the present invention, an inevitable yaw angle is generated in the rotary type head positioning mechanism used in a small hard disk device of 3.5 inches or less, and a recording head becomes a problem at that time. Correlate geometrical off-track generation due to the distance between the reproducing heads to each other, and even if the yaw angle of the magnetic head slider due to the track geometry in the device configuration is large,
This is a hard disk drive that reduces errors when recognizing cylinder information and sector information in a recording sector and has excellent throughput.

Further, even when recording and reproducing are continuously performed on the same track, it is possible to minimize the off-track correction operation amount and avoid a decrease in the off-track margin. That is, in the conventional recording / reproducing separated type hard disk device, the amount obtained by multiplying the sine of the yaw angle on the track geometry at the outermost circumference by the gap position of the thin film inductive head and the separation between the MR heads is the off-track between recording and reproduction. Yes, the off-track is about 2 microns when the outermost peripheral yaw angle of 15 ° and the separation of 8 microns are used, which is a general condition.
The recording density required for a recording density of tracks / inch reaches 30% or more of the recording track width of about 6 microns. However, this off-track amount decreases as it approaches the innermost cylinder,
In the tracks near the innermost circumference, the offset amount is almost zero.

On the other hand, in the recording / reproducing separated type hard disk device of the present invention, the sum of the sine of the outermost yaw angle and the sine of the innermost yaw angle is calculated, and the above-mentioned separation is divided by half. Since the magnetic center positions of the thin film inductive head and the MR head in the track width direction are configured so as to approximately match the multiplied value as a reference, the off-track between recording and reproduction at the outermost circumference is the same as in the conventional case. It can be about one half of the approach.
On the other hand, in this configuration, the off-track becomes almost zero in the vicinity of the central cylinder, the off-track increases in the direction opposite to the track width direction toward the innermost circumference, and the maximum value is almost the same as the off-track at the outermost circumference. Therefore, on the entire surface of the cylinder, the maximum off-track amount of the recording / reproducing separated type hard disk device of the present invention is about 1 micron as calculated in the above case, which is a general wide write / narrow read combined type. The amount can be almost the same as the side guard band in the head. Since the maximum off-track amount is small, it is possible to read the sector ID with almost no off-track during recording and reproduction, and as a result, read errors can be greatly improved even when the yaw angle is large. .

Here, the thin film inductive head and the M
Although the offset amount between the magnetic centers of the R head is defined, it is considered that the magnetic center of the thin film inductive head is almost the same as the geometric center. On the other hand, MR
In the head, the magnetic flux reading direction is generally inclined by 45 ° when viewed from the ABS surface. Therefore, a deviation occurs in the off-track direction between the geometrical position of the MR head and the magnetic position that acts as the reproducing head. This deviation is MR
Approximately 1/4 of the height of the MR element of the head as seen from the ABS surface
The offset off-track direction is inverted depending on the polarity of the sense current of the MR head. Therefore, the offset relationship between the geometrical thin film inductive head and the MR head for satisfying the above-mentioned low off-track characteristic is one of the sum of the sine of the outermost peripheral yaw angle and the sine of the innermost peripheral yaw angle.
The same effect can be obtained by adding / 2 to the value obtained by multiplying the separation by approximately 1/4 of the MR height according to the polarity of the sense current.

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a diagram for explaining the configuration of a thin film inductive head and an MR head relating to a recording / reproducing separated type hard disk device of the present invention as a state in an outermost peripheral cylinder, and is an ABS (air bearing) of a magnetic head slider. (Surface) shows the state viewed from the surface. In FIG. 1, the left-hand direction is the outer cylinder side,
The running direction of the disk is shown in the figure. The thin film inductive head 2 includes a thin film inductive head upper pole 3, a thin film inductive head lower pole 4, a thin film coil which is not visible in FIG. An MR head 10 is provided on the ABS side (not shown) of the thin film inductive head 2 at a distance indicated by a separation 9 when viewed from the thin film inductive head gap 5. Although not shown in FIG. 1, an MR shield or the like is generally provided. FIG. 1 shows an on-track state in the written state, and therefore the center of the thin film inductive head 2 in the track width direction coincides with the data track center 8. Here, since the outermost peripheral yaw angle 6 is generated, the MR head magnetic position 12 in which the magnetic center coincides with the thin film inductive head is separated from the data track center 8 by a sine of the outermost peripheral yaw angle 6 in the separation 9. It is offset to the inner cylinder side by the amount multiplied by.

In this state, when the read operation is immediately performed, the magnetic position of the MR head 10 is on-track on the data track center 8.
It is clear to minimize the off-track margin. Therefore, in this state, to arrange the magnetic position of the MR head 10 from the viewpoint of maximizing the off-track performance, the on-track position 15 to the data center of the MR head is set.
In addition, it is effective to set the magnetic position of the MR head 10. However, since the relative positional relationship between the geometrical position and the magnetic position of the MR head 10 is uniformly determined for each head, such a positional relationship between the thin film inductive head 2 and the MR head 10 is maintained. In general, when the head is moved to the innermost cylinder which is set near zero, the magnetic position of the MR head 10 is the magnetic amount of the separation 9 on the outer cylinder side multiplied by the sine of the outermost yaw angle 6. It will be offset.

Here, the most general track geometry and the separation values of the MR head are as follows: innermost yaw angle 0 °, outermost yaw angle 15 °, separation 8
When a trial calculation is performed in the case of micron, this offset amount is approximately 2 micron, which is an excessive off-track that cannot be ignored in the recent narrow track. On the other hand, in the figure, the correction was performed in consideration of the correction amount 14 of the MR head obtained by multiplying the separation 9 by 1/2 of the sum of the sine of the outermost yaw angle and the sine of the innermost yaw angle. The MR head magnetic position 11 is shown. Reference numeral 20 indicates the MR head magnetic center at the corrected MR head magnetic position.

In this case, in the outermost peripheral cylinder shown in FIG. 1, there is a slight off-track component from the data track center 8, but the value is approximately the innermost periphery in the configuration method shown above. It is clear from the figure that the off-track amount is 1/2 of the off-track amount, and the off-track amount is 1 micron even using the above-mentioned trial calculation value. Even if the head moves to the innermost circumference while maintaining this state, the off-track direction changes to the outer cylinder side, but the absolute value of the off-track amount is almost equal to that at the outermost circumference. Will be obtained. Needless to say, according to the configuration of the present invention, the off-track is minimum, that is, near zero, near the central cylinder.

FIG. 2 is a view for explaining the composite head mounted on the magnetic head slider 22, and the composite head 1 is formed at the trailing edge of the ABS surface 19.

FIGS. 3 and 4 show the structure of the composite head in detail in order to supplement the description in FIG. FIG. 3 shows the structure of the composite head viewed from the ABS surface 19, and includes a thin film inductive head upper pole 3, a thin film inductive head lower pole 4, and an MR head 10 which form a writing thin film inductive head.
Also, an MR upper shield 16 and an MR lower shield 17 that control the MR shield are shown, and they are provided in a protective layer 18 made of alumina provided on the end surface of the ABS surface 19. FIG. 4 is a view for explaining the separation 9 between the thin film inductive head and the MR head in the same composite head, and the thin film inductive head gap 5
The distance between the center of the MR head and the center of the MR head 10 is 9
Is defined as

FIG. 5 is a diagram showing the off-track characteristics of the MR head for explaining the magnetic center of the MR head. The horizontal axis of the figure shows the off-track amount, and the vertical axis shows the reproduction output obtained from the MR head. As shown in FIG. 3, in the composite type head, in order to improve off-track characteristics,
The track width of the pole 3 on the thin film inductive head is M
Generally, a so-called wide writing / narrow reading method, which is larger than the track width of the R head 10, is adopted. Therefore, the reproduction output from the MR head ideally forms a trapezoidal off-track characteristic as shown in FIG. Here, the MR head magnetic center 20 means the center of the maximum output portion 21 of the trapezoidal off-track characteristic curve.

FIG. 6 is a diagram for explaining the track geometry of a hard disk device having a rotary type positioning mechanism, which is generally used for small hard disk devices. The magnetic head slider 22 is an actuator (not shown). It is configured to rotate around the pivot 25 through the mechanism. In this case, when the head is positioned on the innermost circumferential cylinder 23, the longitudinal direction of the magnetic head slider 22 has an innermost circumferential yaw angle 7 with the geometrical tangential direction of the innermost circumferential cylinder 23. On the other hand, the outermost peripheral cylinder similarly has the outermost peripheral yaw angle 6.
The yaw angle here is assumed to be measured clockwise from the tangent line of the track, and is in accordance with the general convention of having positive and negative signs.

FIG. 7 is a diagram for explaining the relative positional relationship between the magnetic thin film inductive head and the MR head. The magnetic center 28 of the thin film inductive head may be such that its geometric center coincides with the magnetic center if the erasure band and side fringing asymmetry of the head are made minute. FIG. 7 shows the magnetic position of the MR head. This is because the actual head is located at the center of the on-track position where the maximum output portion 21 in the reproduction output characteristic of the MR head shown in FIG. 5 is obtained. The virtual MR head position when on-track is shown. The track-direction deviation amount between the thin film inductive head gap 5 and the MR head magnetic center 20 is defined by the magnetic distance 26 between the write / read head.

FIG. 8 is a view for explaining the relative positional relationship between the geometrical thin film inductive head and the MR head. The distance between the thin film inductive head gap 5 and the geometrical center of the MR head in the track direction is defined as the geometrical distance 31 between the write and read heads.

FIG. 9, FIG. 10 and FIG. 11 show the off-track characteristics at the time of reading and writing of the embodiment according to the present invention.
A description will be given based on specific numerical values. Here, as a typical example, the track pitch is 6.2 μm, the write track width is 6.2 μm, the MR head track width is 3.6 μm, the separation between the thin film inductive head gap and the MR head is 7.4 μm, and the vicinity of the innermost track. The yaw angle is 0 ° and the yaw angle is 15 ° near the outermost track.

In FIGS. 9, 10 and 11, 32
Is the first servo pattern, 33 is the second servo pattern, 3
Reference numeral 4 is a third servo pattern, 35 is a first ID field, 36 is a second ID field, 37 is a first data field, and 38 is a second data field.

Under the above conditions, the amount of offset between the thin film inductive head and the magnetic center of the MR head according to claim 1 is approximately 1 μm. FIG. 9 shows a track layout near the innermost track adjacent to each other.
Shows the head positional relationship with respect to each track layout at the time of reproduction, (b) at the time of writing or at the time of recording / reproduction switching for consecutive sectors, and the thin film inductive head is omitted in (a). In (a), the track center line of the MR head magnetic position 27 needs to coincide with the center line of the second data field 38 in order to minimize the off-track during reproduction. On the other hand, (b) shows an on-track state at the time of writing, taking an example of adjacent tracks. At this time, the center of the thin film inductive head 2 and the center line of the first data field 37 are aligned.

Generally, when a write operation is performed, it is necessary to recognize an ID field in which sector information, cylinder information, etc. are written, and then perform data recording in order to write accurately in a target sector. Since the read operation needs to be performed by the MR head, the MR head needs to maintain the on-track state for at least the ID field even when the thin film inductive head 2 is in the on-track state. Here, since the magnetic offset amount of the MR head is 1 μm with respect to the thin film inductive head, when the track width is taken into consideration, the on-track state is maintained even in the first ID field 35, which causes a reproduction error. The write operation can be realized without it.

When performing head positioning by using sector servo information or the like during these operations, a one-phase position error signal composed of the first servo pattern 32 and the second servo pattern 33 is used during writing. In that case, offset positioning of 0.5 μm is performed. The second servo pattern 33 and the third servo pattern 34 are similarly used in the read operation, but in this case, it is necessary to perform offset positioning of 0.5 μm in the opposite direction.

FIG. 10 shows head positions at the time of writing and reading near the center track. Similarly, the thin film inductive head is omitted during reading. In this case, the physical yaw angle is 7.5 °,
The center of the magnetic position 27 of the MR head is on the same line as the center of the thin film inductive head, and therefore the off-track margin for the ID field and the data field becomes maximum during both writing and reading.

FIG. 11 shows head positions at the time of writing and reading for adjacent tracks near the outermost circumference, where (a) corresponds to reading and (b) corresponds to writing.
In this case, the physical head yaw angle is as large as 15 °, but as shown in (b), the MR head magnetic position 27 is within 1 μm off track on the inner peripheral side when viewed from the thin film inductive head 2. First for recognition of write sector
ID field 35 and first data field 3 of
It is clear that it has a sufficient off-track margin for 7.

The description so far has been made based on the magnetic positional relationship between the thin film inductive head and the MR head. In the thin film inductive head,
The magnetic track center and the geometric track center substantially coincide with each other, but they do not coincide with each other in the MR head. On the other hand, the shift amount between the track center and the magnetic track center of the geometric MR head is substantially ¼ of the MR film height 40 measured from the ABS surface 19 of the MR head 10 shown in FIG. It is known that the shift direction can be changed to the track inner peripheral direction or the track outer peripheral direction according to the direction of the signal detection sense current of the MR head. In either case, the shift amount is the same. is there.

Therefore, the MR film height 40 can be used to replace the above description with the geometrical positional relationship between the thin film inductive head and the MR head. That is, the geometrical positional relationship between the thin film inductive head and the MR head can be defined as follows according to the direction of the current, and it has the same effects as those described above.

First, the thin film inductive head and M
The geometrical offset amount of the R head in the track direction is sin which is the sine of the slider yaw angle P1 of the innermost track.
(P1) and the angular offset that is substantially 1/2 of the sum of sin (P2), which is the sine of the slider yaw angle P2 at the outermost track, is added to the separation amount that is the gap distance between the thin film inductive head and the MR head. Multiply by
Further, an amount obtained by adding 1/4 of the MR film height is used as a geometrical offset in the track direction between both heads.

Second, the thin film inductive head and M
The geometrical offset amount of the R head in the track direction is sin which is the sine of the slider yaw angle P1 of the innermost track.
(P1) and the angular offset that is substantially 1/2 of the sum of sin (P2), which is the sine of the slider yaw angle P2 at the outermost track, is added to the separation amount that is the gap distance between the thin film inductive head and the MR head. Multiply by
Furthermore, the amount obtained by subtracting 1/4 of the MR film height is used as the geometrical offset in the track direction between both heads.

Here, if further consideration is added, it depends on the value which is the magnetic offset amount and the MR film height,
When the value that defines the offset amount of the magnetic MR head is made equal, the offset amount of the MR head and the substantially geometrical thin film inductive head can be made zero. In this case, using the same mask, the up-direction head and the down-direction head of the magnetic disk device can be realized only by changing the current direction, which is effective for improving the productivity of the MR head.

[0048]

The relative positional relationship between the thin film inductive head of the composite type head and the MR head in the track width direction is derived from the relationship with the head slider skew caused by the track geometry of the hard disk drive using these heads. The off-track between both heads caused by the head-slider skew can be minimized, and a sufficient off-track margin is secured to obtain a recording / reproducing separated hard disk drive with a small device error rate and excellent throughput. You can

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a composite head according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a magnetic head slider equipped with a composite head.

FIG. 3 is a diagram illustrating a configuration of a composite head.

FIG. 4 is a diagram illustrating a separation amount between a thin film inductive head and an MR head in a composite head.

FIG. 5 is a diagram showing the reproduction characteristics of the MR and explaining the definition of the magnetic center position in the MR head.

FIG. 6 is a diagram illustrating a relationship between a track geometry of a hard disk device and a magnetic head slider skew.

FIG. 7 is a diagram illustrating a magnetic relative positional relationship between a thin film inductive head and an MR head in a composite head.

FIG. 8 is a diagram illustrating a geometrical relative positional relationship between a thin film inductive head and an MR head in a composite head.

FIG. 9 is a diagram for explaining the relationship between the recording field traced by the composite head of the embodiment of the present invention and the head position in the vicinity of the innermost track.

FIG. 10 is a diagram illustrating a relationship between a recording field traced by the composite head according to the embodiment of the present invention and a head position in the vicinity of the center track.

FIG. 11 is a diagram for explaining the relationship between the recording field traced by the composite head of the embodiment of the present invention and the head position in the vicinity of the outermost track.

FIG. 12 is a diagram illustrating the definition of MR film height.

[Explanation of symbols]

1 Composite type head 2 Thin film inductive head 3 Thin film inductive head upper pole 4 Thin film inductive head lower pole 5 Thin film inductive head gap 6 Outermost cylinder yaw angle 7 Innermost cylinder yaw angle 8 Data track center 9 Separation 10 MR head 11 Corrected MR head magnetic position 12 MR head magnetic position where the magnetic center coincides with that of the thin film inductive head 13 MR head magnetic center after correction 14 MR head correction amount 15 MR head data track on-track position 16 MR upper shield 17 MR lower shield 18 Protective layer 19 ABS surface 20 MR head magnetic center 21 Maximum output part 22 Magnetic head slider 23 Innermost cylinder 24 Outermost cylinder 25 Pivot 26 Write / read Magnetic distance between heads 27 Magnetic position of MR head 28 Magnetic center of thin film inductive head 29 Geometric center of thin film inductive head 30 Geometric center of MR head 31 Geometric distance between write and read heads 32 First servo pattern 33 Second servo pattern 34 Third Servo Pattern 35 First ID Field 36 Second ID Field 37 First Data Field 38 Second Data Field 39 Physical Yaw Angle 40 MR Film Height 41 Off Track

Claims (5)

[Claims] 1. A composite type head comprising a thin film inductive head and an MR head integrated, mounted on a magnetic head slider, having a head positioning mechanism which is rotatably supported and fixed on a base and is rotatable around a pivot. 1
A recording / reproducing separated type hard disk device in which a thin film magnetic disk made up of one or more sheets is fixed on a rotating spindle, and those components are hermetically fixed by a housing, wherein digital information is recorded on the thin film magnetic disk of the thin film inductive head. Offset in the track width direction between the geometric center in the recording track width direction in the case of recording and the magnetic center in the recording track width direction in reproducing the digital information recorded on the thin film magnetic disk in the MR head. Of the magnetic head slider,
Substantially the sum of sin (P1) which is the sine of the yaw angle P1 in the innermost track of the recording data area of the thin film magnetic disk and sin (P2) which is the sine of the yaw angle P2 in the outermost track of the recording data area. To an angular offset value P which is ½ of the separation distance S in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction.
The recording / reproducing separated type hard disk device, wherein the offset amount is defined so as to substantially match S · P multiplied by. 2. The recording / reproducing separated type hard disk device according to claim 1, wherein the angular offset value is substantially 0.175 to 0.3.
42 is a recording / reproducing separated type hard disk device. 3. The recording / reproducing separated type hard disk device according to claim 1, wherein the thin film inductive head has a geometric center in a recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head. When reproducing digital information recorded on the thin film magnetic disk, the offset amount in the track width direction between the geometrical center in the recording track width direction and the geometric center in the recording track width direction is
Substantially the sum of sin (P1) which is the sine of the yaw angle P1 in the innermost track of the recording data area of the thin film magnetic disk and sin (P2) which is the sine of the yaw angle P2 in the outermost track of the recording data area. To an angular offset value P which is ½ of the separation distance S in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction.
The offset amount is defined by S · P + H, which is obtained by adding the amount H, which is substantially 1/4 of the MR film height viewed from the ABS surface of the MR head, to S · P multiplied by A separate recording / playback type hard disk device characterized by the following. 4. The recording / reproducing separated type hard disk device according to claim 1, wherein the thin film inductive head has a geometric center in a recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head. When reproducing digital information recorded on the thin film magnetic disk, the offset amount in the track width direction between the geometrical center in the recording track width direction and the geometric center in the recording track width direction is
Substantially the sum of sin (P1) which is the sine of the yaw angle P1 in the innermost track of the recording data area of the thin film magnetic disk and sin (P2) which is the sine of the yaw angle P2 in the outermost track of the recording data area. To an angular offset value P which is ½ of the separation distance S in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction.
Multiplied by S · P, an amount H that is substantially 1/4 of the MR film height viewed from the ABS surface of the MR head is
A recording / reproducing separated type hard disk device in which the offset amount is defined in S · P−H obtained by subtracting from the amount represented by P. 5. The recording / reproducing separated type hard disk device according to claim 4, wherein the thin film inductive head has a geometric center in a recording track width direction when digital information is recorded on the thin film magnetic disk, and the MR head. When reproducing digital information recorded on the thin film magnetic disk, the offset amount in the track width direction between the geometrical center in the recording track width direction and the geometric center in the recording track width direction is
Substantially the sum of sin (P1) which is the sine of the yaw angle P1 in the innermost track of the recording data area of the thin film magnetic disk and sin (P2) which is the sine of the yaw angle P2 in the outermost track of the recording data area. To an angular offset value P which is ½ of the separation distance S in the track circumferential direction between the recording gap position of the thin film inductive head and the center position of the MR head in the film thickness direction.
The amount H, which is substantially 1/4 of the MR film height viewed from the ABS surface of the MR head, is formed so as to be substantially the same as the offset amount S · P. A recording / reproducing separated type hard disk device having a composite type head.