JPH08315311A - Magnetic recording head - Google Patents

Abstract

PURPOSE: To obtain a magnetic recording head capable of stably recording image information having lessened unequalness and blotting on a magnetized medium. CONSTITUTION: The size (dot size) WD of the recording region on the surface of the magnetized medium 2 magnetized by the magnetic fields impressed on the magnetized medium 2 from a main magnetic pole 11 of the perpendicular magnetic head 1 is measured by using the main magnetic pole 1 having several different main magnetic pole widths WP. A graph of the main magnetic pole widths WP with respect to the dot size WD at which the fluctuation in the case of the spacing DS of 0 and 5μm attains <=10% of a permissible range is plotted based on the obtd. data and the main magnetic pole widths WP are so designed as to satisfy the region held by the resulted two straight lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording head,
In particular, it relates to a magnetic recording head which is used in a magnetic printer and records information by applying a magnetic field to a magnetized medium.

[0002]

Prior Art and Problems to be Solved by the Invention FIG.
Is a general magnetic printer 901 including a magnetic recording head.
It is a figure which shows the structure of.

The magnetic printer 901 and the magnetic recording head used therein will be briefly described below.

Referring to FIG. 9, the magnetic printer 901 is
A magnetic drum 903 having a magnetized medium formed on the surface thereof, a magnetic recording head 905 for forming a magnetic latent image on the magnetic drum 903, a developing unit 907 for developing the magnetic latent image, and a recording sheet 920. Paper feed roller 90 for feeding
9, a transfer roller 911 that transfers the developed latent image to the recording sheet 920, and a fixing device 9 that fixes the transferred latent image.
13 and an erasing head 915 for erasing the formed latent image
And a cleaning device 917 for cleaning the magnetic drum 903.

Recording paper 920 is fed by paper feed roller 909.
Is inserted between the magnetic drum 903 and the transfer roller 911. The magnetic recording head 905 causes the magnetic drum 903.
A magnetic field is applied to the magnetized medium formed above, a recording pattern corresponding to image information is recorded, and a magnetized region that becomes a latent image is formed. Magnetic drum 903 by developing unit 907
The latent image is developed by attracting the magnetic toner to the upper magnetized region. The magnetic toner adsorbed on the magnetic drum 903 is transferred by the transfer roller 911, and is fixed by the fixing device 913 to form a hard copy 921.

Conventionally, a perpendicular magnetic recording head has been proposed as a magnetic recording head used in a magnetic printer as shown in FIG.

The perpendicular magnetic recording head only performs recording in a state in which it is in contact with the magnetized medium on the surface of the magnetic drum. When the recording is performed in contact with the magnetized medium in this manner, the abrasion due to sliding causes the magnetized medium to move. There is a problem that the magnetic recording head is damaged and lacks in durability. On the other hand, when the magnetic recording head is separated from the magnetization medium, the distance between the end surface and the magnetization medium (hereinafter , A spacing) changes the size of a recording area (hereinafter referred to as a dot) recorded on the surface of the magnetized medium, resulting in unevenness or blurring in the printed image. there were.

The present invention has been made to solve the above problems, and a magnetic recording head capable of stably recording highly reliable image information with less unevenness and blurring on a magnetized medium. The purpose is to provide.

[0009]

A magnetic recording head according to a first aspect of the present invention is a magnetic recording head for recording information by applying a magnetic field to a magnetized medium, and has end faces facing the magnetized medium at a predetermined interval. A main magnetic pole is provided, and a magnetic field is applied by the main magnetic pole, whereby information is recorded in a first direction on the magnetized medium and a width in a second direction intersecting the first direction on the recording area where the information is recorded. Based on the above, the width of the end surface of the main pole in the second direction is adjusted so that the variation between the width of the recording area in the second direction and the width of the end surface of the main pole in the second direction falls within a desired range. Determined.

A magnetic recording head according to a second aspect of the present invention is the magnetic recording head according to the first aspect, wherein the width of the recording area in the first direction and the width of the main magnetic pole are determined based on the width of the recording area in the first direction. The width of the end surface of the main pole in the first direction is determined so that the variation with the width of the end surface in the first direction falls within a desired range.

According to a third aspect of the magnetic recording head of the first or second aspect, the second recording area
When the direction of the width is W _D, the width W _P of the second direction of the end face of the main _{pole, (1.065 × W D -12.0)} ≦ W P ≦
The relationship of (1.172 × W _D -12.0) is satisfied.

A magnetic recording head according to a fourth aspect of the present invention is the magnetic recording head according to any one of the first to third aspects, wherein when the width of the recording region in the first direction is W _D ′, the first end face of the main pole is formed. direction 'is, (1.065 × W _D' width W _P -1
_{2.0) ≦ W P '≦ (} 1.172 × W D' -12.0)
Meet the relationship.

[0013]

In the magnetic recording head according to the first aspect of the present invention, the width in the second direction of the end face of the main magnetic pole facing the magnetized medium is determined based on the width in the second direction of the recording area. Was
It is possible to stably suppress the variation between the width of the recording area in the second direction and the width of the end surface of the main pole in the second direction within a desired range.

A magnetic recording head according to a second aspect of the present invention is the magnetic recording head according to the first aspect, further comprising the width of the recording region in the first direction and the width of the end face of the main pole in the first direction. It is possible to stably suppress the fluctuation within a desired range.

A magnetic recording head according to a third aspect of the present invention is the magnetic recording head according to the first or second aspect, wherein the width of the recording region in the second direction and the width of the end face of the main pole in the second direction. The width in the second direction of the end surface of the main pole that can stably suppress the fluctuation within the desired range is expressed by a specific formula using the width of the recording area in the second direction.

A magnetic recording head according to a fourth aspect of the present invention is the magnetic recording head according to any one of the first to third aspects, in which the width of the recording area in the first direction and the first direction of the end face of the main pole are in the first direction. The width in the first direction of the end face of the main pole, which can stably suppress the fluctuation with the width of the recording medium within a desired range, is expressed by a specific formula using the width of the recording region in the second direction. Be done.

According to a fifth aspect of the present invention, in the magnetic recording head according to any one of the first to fourth aspects, it is possible to further reduce variations in the width of the recording region and the width of the end face of the main pole. It will be possible.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a calculation model of a perpendicular magnetic recording head 1 according to an embodiment of the present invention and a magnetized medium 2 facing it.

Referring to FIG. 1, a perpendicular magnetic recording head 1 according to an embodiment of the present invention has a main magnetic pole 11 for applying a magnetic field to a magnetization medium 2, a support portion 13 for holding the main magnetic pole 11, and a main magnetic pole 1.
Auxiliary magnetic pole 1 for improving the magnetization efficiency of the magnetization by 1.
5 and the conductive winding 17.

The magnetization medium 2 is formed on the aluminum drum 3 facing the perpendicular magnetic recording head 1 and includes a perpendicular magnetization medium 21 having perpendicular magnetic anisotropy and a backing layer 23 having high magnetic permeability.

In the cross section of the perpendicular magnetic recording head 1, the auxiliary magnetic pole 15 is L-shaped, the support portion 13 is formed at the inner end of one side thereof, and the main magnetic pole 11 is held at the tip thereof.

In FIG. 1, T _H is the medium thickness, D _S is the spacing, T _R is the backing layer thickness, L _P is the main magnetic pole length, W _P is the main magnetic pole width, W _L is the winding portion width, and D _{L is} Is the winding depth, W _S is the support width, W _R is the auxiliary magnetic pole width, and H _c is the core thickness.

In the magnetization medium 2, the perpendicular magnetization medium 23 is formed on the backing layer 21 in order to improve the magnetization efficiency.
It is a laminated medium having a layered structure.

Now, the perpendicular magnetic recording head 1 is a recording magnetic head for a MnZn ferrite magnetic printer, and a magnetic medium 2 is used.
In, the perpendicular magnetization medium 23 is CoNiP, and the backing layer 2 is
When 1 is NiFe and has the structural parameters shown in Table 1 described later, when the main magnetic pole 11 is used to magnetize the magnetizing medium 2 with a single pulse of a magnetomotive force of 1.5 AT (ampere turn), the spacing is Calculations were performed on how the magnetic field strength on the magnetization medium 2 is distributed by changing the shape of the main magnetic pole and.

FIG. 2 is a perspective view of the perpendicular magnetic recording head 1 of FIG. Referring to FIG. 2, when the perpendicular magnetic recording head 1 is cut at a section A, a sectional view of the perpendicular magnetic recording head 1 as shown in FIG. 1 is obtained. The perpendicular magnetic recording head 1 is
The unit block is composed of a plurality of unit blocks having the cross section shown in FIG. 1, and each unit block is L as described in FIG.
The support portion 13 is formed at the inner end of one side of the V-shaped auxiliary magnetic pole 15, and the main magnetic pole 11 is held at the tip thereof. A conductor winding 17 is wound around the supporting portion 13 to excite the main magnetic pole 11. Main magnetic pole 11, auxiliary magnetic pole 15, and conductor winding 1
7 is molded with resin or low melting point glass, and is protected and reinforced.

The main magnetic pole 11 records image information on the magnetized medium 2 on the surface of the magnetic drum which vertically faces the perpendicular magnetic recording head 1. The auxiliary magnetic pole 15 improves the magnetizing efficiency by forming a closed magnetic path when the magnetic flux generated from the main magnetic pole 11 magnetizes the magnetizing medium 2.

FIG. 3 is a diagram showing the magnetic flux generated by the perpendicular magnetic recording head 1 in the model sectional view of FIG. 1 by arrows.

Referring to FIG. 3, the magnetic flux flows in the order of main magnetic pole 11 → perpendicular magnetic medium 23 → backing layer 21 → vertical magnetic medium 23 → auxiliary magnetic pole 15 → main magnetic pole 11 to efficiently magnetize magnetic medium 2. It

At this time, as can be seen from FIG. 2, the area facing the magnetizing medium 2 is smaller than that of the main magnetic pole 11 by the auxiliary magnetic pole 15.
Is much larger. Therefore, compared with the magnetic flux density on the surface of the main magnetic pole 11, the magnetic flux density on the surface of the auxiliary magnetic pole 15 is about several tens to several hundredths, and the magnetization reversal of the magnetization medium 2 only on the main magnetic pole 11 side. The magnetization does not occur on the auxiliary magnetic pole 15 side.

Table 1 shows the perpendicular magnetic recording head 1 and the perpendicular magnetic recording medium 2 of FIG. 1 used for the calculation of the magnetic field strength distribution on the magnetic recording medium 2 for designing the perpendicular magnetic recording head 1 of the embodiment of the present invention. It is a list of structural parameters of a calculation model.

[0032]

[Table 1]

In particular, a case where the end surface of the main magnetic pole 11 facing the magnetization medium 2 is square and one side thereof is 63.5 μm will be described.

With reference to Table 1, No. 1 to No. The calculation models of 11 types of perpendicular magnetic recording heads of 11 types are shown, and the parameters thereof are the magnetization medium thickness T _H , the spacing D _S , the backing layer thickness T _R , the support pole length L _P, and the support pole width. W _P , winding portion width W _L , winding portion depth D _L , main magnetic pole permeability μ _P, and backing layer permeability μ _R are shown.
These structural parameters correspond to the part of the symbol shown in FIG. All units are [μm].

FIG. 4 shows changes in the magnetic field strength from the perpendicular magnetic recording head 1 on the surface of the magnetization medium 2 of FIG.
It is a figure which shows about the distance from the central axis O _{P of} 1.

Referring to FIG. 4, the horizontal axis represents the distance x [μm] from the central axis O _P of the main pole 11, and the vertical axis represents the magnetic field strength H.
[Oe] is shown.

The magnetic field strength H on the surface of the magnetized medium 2 is strongest in the vicinity of the central axis O _P of the main magnetic pole 11 and attenuates as the distance from the central axis O _P increases. The shape of this polarity is almost unaffected by the main magnetic pole length L _P , the winding portion width W _L , the winding portion depth D _L , the magnetic permeability μ _{P of the} main magnetic pole, and the like in Table 2, and shows almost the same shape. .

In FIG. 5, the main magnetic pole width W is further increased than in the case of FIG.
The change of the magnetic field strength distribution from the perpendicular magnetic recording head 1 on the surface of the magnetization medium 2 when _P is increased is shown in FIG.
It is a diagram showing a distance from the central axis O _D of.

Referring to FIG. 5, similarly to FIG. 3, the horizontal axis represents the distance x [μm] from the central axis O _P of the main magnetic pole 11, and the vertical axis represents the magnetic field strength H [Oe]. .

[0040] In FIG. 5, as compared with FIG. 4, trend to the main magnetic pole width W _P of the magnetic field strength H is the magnetic field strength H as the main magnetic pole width W _P becomes larger regions main magnetic pole center indicating the maximum value The maximum value of the magnetic field strength H and the shape of the curve of the portion where the magnetic field strength H attenuates are hardly affected only by spreading from the axis O _P. That is, the maximum value of the magnetic field strength H and the attenuation of the magnetic field strength H caused by the main magnetic pole 11 of the perpendicular magnetic recording head 1 on the surface of the magnetized medium 2 are the main magnetic pole length L _P , the main magnetic pole width W _L ,
It can be seen that the winding depth D _L and the magnetic permeability μ _{P of the} main pole are hardly affected.

Table 2 shows No. 1 in Table 1. 1 to No. 11 is a table showing the magnetic field strength distribution on the surface of the magnetization medium 2 when 1.5 [AT] is applied to the calculation model of the perpendicular magnetic recording head 1 of 11.

The values in Table 2 show the dot size at each magnetic field strength based on the curve in FIG.

[0043]

[Table 2]

With reference to Table 2, No. 1 to No. The maximum value Hmax of the magnetic field strength on the surface of the magnetized medium 2 in each calculation model up to 11 and the magnetic field strength H is 303,500,
667, 833, 1000, 1167 [Oe] and the dot size on the surface of the magnetized medium (the length of one side of the square magnetization) are shown.

6 is based on the results of Table 2. 1 to N
It is a figure which shows the magnitude | size of the inclination of the attenuation part in the curve of the magnetic field strength on the surface of the magnetization medium 2 calculated about each calculation model of o11.

Referring to FIG. 6, the horizontal axis represents the magnetic field strength H [Oe] on the surface of the magnetization medium 2, and the vertical axis represents the central axis O of the main pole.
Average rate of change of magnetic field strength H with respect to distance x from _P ΔH /
Δx [Oe / μm]. That is, the slope of the curve of the attenuation part of the magnetic field strength H on the surface of the magnetized medium 2 obtained by calculating the results of Table 2 is shown for each calculation model for each magnetic field strength. Nos. 1 to 11 of the calculation model in Table 2 are shown in FIG. The calculation result about 1-11 is shown.

As a result, it is possible to understand how the attenuation of the magnetic field strength H by moving away from the central axis O _B of the main magnetic pole changes depending on the structural parameter. By comparing the inclinations for each magnetic field strength, the magnetization It can be determined whether the magnetic field strength decays on the surface of the medium 2 are similar.

According to FIG. 6, the calculation model No. 1-6
It can be said that the slopes of the attenuation portions of the magnetic field intensity curves of 8 and 9 are close to each other, and the magnetic field intensity attenuations of these calculation models are very similar. That is, the attenuation state of the magnetic field is almost the same for the main magnetic pole length L _P , the main magnetic pole width W _P , the winding portion width W _L , the winding depth D _L , and the magnetic permeability μ _{P of the} main magnetic pole as described above. It can be seen that there is no influence, and the spacing Ds between the magnetization medium 2 and the perpendicular magnetic recording head 1 largely changes. That is, the calculation model No. 4, 7, 10, 11
As can be seen from the above, the larger the spacing D _S , the smaller the gradient of the curve of the attenuation part of the magnetic field strength, and the magnetic field strength distribution changes gently. Further, as can be seen from the maximum value Hmax of the magnetic field strength in Table 2, the magnetic field strength H on the surface of the magnetization medium 2 decreases as the spacing D _S between the magnetization medium 2 and the perpendicular magnetic recording head 1 increases. For example, when the spacing D _S is 5 [μm], the maximum is 1333 [Oe].
Magnetic field can be obtained, but the spacing D _S is 10
About 933 [Oe] at [μm], 700 at 15 [μm]
[Oe] is the maximum.

In principle, even if the magnetic field strength on the magnetization medium decreases due to the increased spacing, it is possible to reverse the magnetization of the magnetization medium by supplying a large magnetomotive force to the magnetic head. However, since the magnetomotive force is the product of the current and the number of turns of the conductor winding (coil), the current value increases if the number of turns of the coil is constant, and the power consumption increases accordingly. On the other hand, in order to reduce the power consumption while maintaining a large magnetomotive force, it is necessary to increase the number of turns of the coil and reduce the current flowing to the coil as much as possible. Then, the distance between the heads becomes very small, and it is difficult to carry out a large number of windings such as tens to hundreds of turns. Further, if the number of windings increases, the manufacturing cost increases, and it is not possible to provide an inexpensive perpendicular magnetic recording head.

Considering these points, the number of turns of the coil cannot be extremely increased. Therefore, it is considered that the number of turns of the coil is practically 10 to 10 or more turns in practice. On the other hand, the current value supplied to the magnetic head needs to be suppressed to about a hundred and several tens mA in consideration of the capacity of the driver transistor for driving the magnetic head. For example, considering that a current is passed in both directions to the head, four transistors are required for each head.
Integrating ~ 400 heads requires 1200 to 1600 transistors. At this time, if the current value to be applied to the head is several A, a large power transistor must be used.
If 0 or more are used, the head drive circuit becomes very large, which is not realistic. Therefore, it is necessary to keep the current value as small as possible. From the above, the magnetomotive force of the magnetic recording head is (10 turns) × (hundreds of tens mA) of 1. A number AT is reasonable.

Since the coercive force of the perpendicular magnetization medium which has been reported so far is about 1000 [Oe], the perpendicular magnetization medium must be at least 1000 [Oe] unless the magnetic field generated on the magnetization medium is at least 1000 [Oe]. Cannot be reversed. In order to reverse the magnetization of the perpendicular magnetization medium with a low recording current, it is necessary to record the perpendicular magnetic recording head and the magnetization medium as close to each other as possible. The magnetic field strength on the magnetized medium is 1000 [O] when the spacing exceeds 10 [μm] as described with reference to FIG.
e] or less, and the magnetization medium cannot be magnetized sufficiently with a practical recording current. Therefore, in order to reverse the magnetization of the above perpendicular magnetization medium, the spacing is 5 [μ
m] or less is desirable.

Further, in order to stably record the image information on the magnetized medium 2 by the perpendicular magnetic recording head 1, the characteristic that the variation of the dot size is small due to the variation of the spacing is required.

[0053] Table 3, the change due to the spacing D _S of the magnetic field intensity distribution on the magnetization medium 2 using a computational model of Table 1, the spacing D _S is 5 [[mu] m] on the magnetization medium surface of the magnetic field strength 5 is a table showing the results of standardization by the width of the area.

[0054] Table 4, like Table 3, the width of the area on the magnetic media surface of the magnetic field strength in the spacing D _S changes due to spacing D _S of the magnetic field intensity distribution on the magnetization medium 10 [[mu] m] It is a table which shows the result standardized by.

The calculation model is No. 4, 7, 10, 11
Is used.

[0056]

[Table 3]

[0057]

[Table 4]

Comparing Table 3 and Table 4, when the spacing D _S changes 5 → 0 [μm] and 10 → 5 [μm] at the same 5 [μm] distance change, 5 → 0 [μm] ], The width of the region of each magnetic field strength is hardly changed, while at 10 → 5 [μm], the spread of the equal magnetic field region is 28% at maximum. From this, it can be understood that it is desirable to set the spacing to 5 [μm] or less in order to suppress the fluctuation of the dot size.

On the other hand, in order to reduce the power consumption as much as possible, it is desirable to magnetize the magnetizing medium in the region where the magnetic field is as strong as possible. As can be seen from Tables 3 and 4, the spacing increases as the magnetic field strength H increases. The variation of the magnetized region is large due to the variation of D _S. Conversely,
In the region where the magnetic field intensity is weak, the variation of the magnetized region due to the variation of the spacing D _S is small, but since the magnetic field intensity on the magnetization medium is weak, the magnetomotive force is increased and the entire magnetic field is increased in order to magnetize the magnetization medium. Therefore, the current flowing through the conductor winding of the magnetic recording head is increased, resulting in an increase in power consumption.

Considering, for example, a magnetization medium in which magnetization reversal occurs with a magnetic field strength of 1000 [Oe], in Tables 3 and 4, the variation of the magnetized area with a magnetic field strength of 500 [Oe] is 5 →
It is 0.2% even with respect to the variation of the spacing of 5 [μm] from 0 [μm], which is very small as compared with the variation of 7 [%] of the magnetized region with the magnetic field strength of 1000 [Oe]. But 5
With 00 [Oe], the magnetization of this magnetization medium cannot be reversed. Therefore, in order to use a magnetized region of 500 [Oe] at 1.5 AT, which is very stable against variations in spacing, for this magnetized medium, the magnetomotive force of the magnetic head should be set to twice or more, The magnetic field strength of this magnetized region is 1000
It is necessary to design so as to be equal to or more than [Oe], and thus the power consumption of the head becomes large.

That is, if recording is performed using a region having a strong magnetic field, the power consumption can be suppressed to a low level, but the magnetic field region, that is, the dot size, changes greatly due to the variation in spacing, and conversely, the magnetic field region is weak. If the recording is performed using the area, the fluctuation of the dot size due to the fluctuation of the spacing becomes small, but a large power consumption is required to sufficiently magnetize the magnetizing medium.

Therefore, as the most suitable magnetic field strength on the magnetized medium, the magnetic field strength with the highest value among the magnetic field strengths in which the change in dot size due to the variation in spacing is within the allowable range is the most suitable.

Now, as an example, the allowable range of dot size variation is set to 10%. Table 5 shows the calculation model N of Table 2.
o. 9 is a table showing the dot size in which the variation of the dot size due to the variation of the spacing D _S of 5 → 0 [μm] is within 10 [%] when the main magnetic pole width W _P is changed using 10 and 11.

[0064]

[Table 5]

Referring to Table 5, each of the main magnetic pole widths W _P for two cases where the spacing D _S is 0 and 5 [μm]
Dot size in [μm] and spacing D
_{When S} is 5 [μm], the maximum magnetic field strength Hmax [Oe] and the magnetic field (optimum recording magnetic field) such that the variation of the dot size with respect to the maximum magnetic field strength Hmax is within 10 [%]. Area percentages are shown.

That is, Table 5 shows the most efficient conditions for reversing the magnetization of the magnetizing medium with a magnetomotive force as small as possible and suppressing the dot size fluctuation within the allowable range.

For example, when recording dots with a width of 64.34 [μm], a perpendicular magnetic recording head with a main magnetic pole width of 63.5 [μm] is used, and the spacing is 0 to 5 [μ].
m], the dot size is 64.34 to 70.
The fluctuation is 77 [μm], and the fluctuation of the dot size is within the allowable range of 10%. Further, under this condition, since recording can be performed in the region of the magnetic field strength of about 83% of the maximum magnetic field strength, the power consumption can be designed small as described above.

FIG. 7 shows the dot size D in Table 5._WAnd the main pole
Width W_PIt is a figure which shows the relationship with. Referring to FIG. 7, the horizontal axis
Is the dot size D_W[Μm], and the vertical axis represents the main magnetic pole width W
_P[Μm].

In FIG. 7, ◯ indicates that the spacing D _S is 5.
The relationship between the dot size W _D of [μm] and the main magnetic pole width W _P is shown. Δ indicates the relationship between the dot size W _D and the main magnetic pole width W _P when the spacing D _S is 0 [μm]. Both have a nearly linear correlation. These straight lines, when the spacing D _S is 0 [[mu] m], when _{W P = 1.065 × W D -12.0} ... (1) spacing D _S is _{5 [μm], W P =} 1 .172 × W _D -12.0 ... (2)

FIG. 8 is an enlarged view of a part of the two straight lines in FIG. Referring to FIG. 8, when a certain main magnetic pole width W _P1 is set, W _P = W _P1 and the above equations (1) and (2)
Assuming that the dot size coordinates of the intersection with the two straight lines of WD are W _D2 and W _D3 , the dot size recorded by using the main magnetic pole of this main magnetic pole width W _P1 is the variation of the spacing of 0 to 5 [μm]. For W _{D2 to} W _D3 .

On the contrary, the desired dot size W_D2And thought
Straight line W_D= W_D2And the intersection W with the straight line of formula (2)_P1Mainly
If the magnetic pole width is set, the spacing of 0-5 [μm]
Dot size W against fluctuation_DIs W_D2~ W_D3Strange between
Move and intersect W with the straight line in equation (1)_P2Set the main pole width to
If this is the case, it is possible to adjust the spacing for variations of 0-5 [μm]
Size is W_D1~ W_D2Fluctuates between At this time,
Size is W_D1~ W _D2And W_D2~ W_D3In which fluctuation of
Can fall within the allowable range of 10%
it can.

That is, by varying the dot size by setting the main magnetic pole width in the region indicated by the diagonal lines sandwiched by the two straight lines of the above equations (1) and (2) with respect to the desired dot size. Within the allowable range of 10%, the most efficient recording with low power consumption can be performed.

Up to this point, the main magnetic pole having a square end face has been described, but when the main magnetic pole having a rectangular end face is considered, for example, the dot shape is only rectangular, and the long side length of the dot is long. the W _D, and the length of the short side and _{W D ', (1.065 × W} D -12.0) ≦ W P ≦ (1.172 × W D -12.0) ... (3) (1 _{.065 × W D '-12.0) ≦} W P' ≦ (1.172 × W D '-12. 0) ... (4) the composed as a main magnetic pole of the long side length W _P and short By setting the length W _P ′ of, the same effect as above can be obtained.

Finally, a method of manufacturing the perpendicular magnetic recording head according to the embodiment of the present invention based on the above design will be briefly described.

First, Mn ferrite or N, which becomes the magnetic core,
processing the blocks of magnetic material such as iZn ferrite by mechanical processing such as _{slicing, 1.065 × W D -12.0 ≦ W} P ≦ 1.172 × W for a desired dot size W _D as described above _The main magnetic pole width W _P is formed so as to satisfy the relationship of _D −12.0 (5). Next, similarly, a supporting portion for the main pole is formed by mechanical processing such as slicing. When forming the support portion of the main pole, the conductor winding is formed in the groove formed by machining. Then, the groove provided with the conductor winding and the main magnetic pole are molded with resin or low melting point glass, the sliding surface is polished by surface grinding or the like, and the main magnetic pole is processed to a predetermined height, as shown in FIG. It is possible to obtain a perpendicular magnetic recording head.

With the perpendicular magnetic recording head designed as described above, variation in dot size with respect to variation in spacing is suppressed within a permissible range, high resolution and high reliability with less unevenness and blurring of images. High image information can be stably recorded on the magnetic medium.

[0077]

In the magnetic recording head according to claim 1 of the present invention, the width of the end face of the main pole in the second direction is determined based on the width of the recording area in the second direction. It is possible to stably suppress the variation between the width in the second direction and the width in the second direction of the end surface of the main pole within a desired range.

A magnetic recording head according to a second aspect of the present invention is the magnetic recording head according to the first aspect, further comprising a width of the recording region in the first direction and a width of the end face of the main pole in the first direction. It is possible to stably suppress the fluctuation within a desired range.

According to a third aspect of the present invention, there is provided a magnetic recording head according to the first or second aspect, wherein the width of the recording area in the second direction and the width of the end face of the main pole in the second direction. The width in the second direction of the end surface of the main pole that can stably suppress the fluctuation within the desired range is expressed by a specific formula using the width of the recording area in the second direction.

A magnetic recording head according to a fourth aspect of the present invention is the magnetic recording head according to any one of the first to third aspects, wherein the width of the recording region in the first direction and the first end face of the main pole are the same.
The width in the first direction of the end surface of the main pole that can stably suppress the variation with the width in the direction of It is represented by.

According to a fifth aspect of the present invention, in the magnetic recording head according to any one of the first to fourth aspects, it is possible to further reduce variations in the width of the recording region and the width of the end face of the main pole. it can.

As a result, it is possible to provide a magnetic recording head capable of stably recording reliable image information having high resolution and little unevenness or blurring on an image on a magnetic medium.

[Brief description of drawings]

FIG. 1 is a calculation model cross-sectional view of a perpendicular magnetic recording head 1 according to an embodiment of the present invention and a magnetic medium 2 facing it.

FIG. 2 is a perspective view of the perpendicular magnetic recording head 1 of FIG.

3 is a diagram showing magnetic flux generated by the perpendicular magnetic recording head 1 in the model cross-sectional view of FIG. 1 by arrows.

4 shows changes in the magnetic field strength from the perpendicular magnetic recording head 1 on the surface of the magnetization medium 2 in FIG.
It is a figure which shows about the distance from _P.

FIG. 5 is a perpendicular magnetic recording head 1 on a magnetization medium 2 when the width W _{P of the} main magnetic pole is made larger than that of FIG.
FIG. 6 is a diagram showing changes in the magnetic field strength distribution from the above with respect to the distance from the central axis O _P of the main magnetic pole 11.

6 is a table showing the results of Table 2 and No. 1 to No. FIG. 12 is a diagram showing the magnitude of the slope of the attenuation portion in the curve of the magnetic field strength on the surface of the magnetized medium 2 calculated for each of the 11 calculation models.

7 is a diagram showing the relationship between the dot size W _D and the main magnetic pole width W _{P in} Table 5. FIG.

8 is an enlarged view showing a part of the two straight lines in FIG.

FIG. 9 is a general magnetic printer 9 including a magnetic recording head.
It is a figure which shows the structure of 01.

[Description of Reference Signs] 1 perpendicular magnetic recording head 11 main pole D _S spacing W _P main pole width H magnetic field strength O _P center axis of main pole x distance from center axis O _P of main pole on magnetized medium

Claims (5)

[Claims] 1. A magnetic recording head for recording information by applying a magnetic field to a magnetizing medium, comprising: a main magnetic pole having end faces opposed to the magnetizing medium at a predetermined interval, the magnetic field being applied by the main magnetic pole. , Thereby recording information in the first direction on the magnetization medium, and based on the width in the second direction intersecting the first direction on the recording area where the information is recorded, The width in the second direction of the end surface of the main magnetic pole is determined so that the variation between the width in the second direction and the width of the end surface of the main magnetic pole in the second direction is within a desired range. Magnetic recording head. 2. The width of the recording area in the first direction and the width of the end surface of the main magnetic pole in the first direction based on the width of the recording area in the first direction. The magnetic recording head according to claim 1, wherein the width of the end surface of the main pole in the first direction is determined so that the fluctuation is within a desired range. 3. The width of the recording area in the second direction is W
When is _D, the width W _P of the second direction of the end face of the main magnetic _{pole, (1.065 × W D -12.0)} ≦ W P ≦ (1.172
× magnetic recording head according to claim 1 or 2 satisfying the relation of W _D -12.0). 4. The width of the recording area in the first direction is W
'When, the main magnetic pole width W _P of the first direction of the end face' _{D is, (1.065 × W D '-12.0} ) ≦ W P' ≦ (1.1
Claims 1 meet the 72 × W _D '-12.0) relationship to the magnetic recording head according to any one of 3. 5. The magnetic recording head according to claim 1, wherein the distance in the predetermined range is 5 μm or less.