JPS61229215A - Magnetic head - Google Patents

Abstract

PURPOSE:To exclude the adverse effect of powder caused by abrasion onto a recording/reproducing signal by providing a recess near a magnetic pole for receiving/giving a signal magnetic field from/to a magnetic recording medium. CONSTITUTION:Two slots 13a, 13b are formed nearly in parallel with the lengthwise direction of an end face 12a at both sides of the end face 12a with a prescribed width and depth. A magnetic disc 2 slides in the direction of arrow X while sliding onto a medium sliding face 12 of a main magnetic pole 50, powder due to abrasion is produced due to abrasion between the main magnetic pole 50 and a magnetic disc 2, the powder is adhered in the vicinity of ridges of the pole 50 crossed with a plane of the medium sliding face 13 and become adhered abrasion powder 14. In using the head further, the abrasion powder 14 is exfoliated and invaded between the magnetic disc 2 and the medium sliding face 13, caught by the slot 13a as the abrasion powder 14a and fallen off, but the powder does not reach the end face 12a of the main magnetic pole film 12. Similarly, the abrasion powder produced at the right side of the end face 12a is caught in the slot 13b as the abrasion powder 14b.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a magnetic head, and more specifically, to a magnetic head that prevents abrasion particles, dust, etc. from accumulating in the portion of the magnetic head that transmits and receives a signal magnetic field to and from a recording medium. Regarding.

(Prior art) In the perpendicular magnetic recording method in which a magnetic recording medium is magnetized in the thickness direction, in principle, the shorter the wavelength (higher frequency) of the magnetization that is magnetically recorded, the more It is known that it is suitable for high-density recording because the self-demagnetizing field is small.

To perform such perpendicular magnetic recording, a magnetic recording medium with large perpendicular magnetic anisotropy and a magnetic recording head that generates a sharp and strong perpendicular component magnetic field are required. As methods for performing perpendicular magnetic recording, there are known an auxiliary pole excitation type perpendicular magnetic head system and a main pole excitation type perpendicular magnetic head system.

For example, as shown in FIG. 5, in a magnetic head 10 of the auxiliary pole excitation type perpendicular magnetic head type, a main pole 1 and an auxiliary pole 4 are disposed facing each other with a predetermined gap 3 in between. A magnetic recording medium 2 (hereinafter referred to as a magnetic disk) moves in the direction of arrow X while slidingly contacting the main magnetic pole 1 between the air gaps 3 to perform recording and reproduction.

The main magnetic pole 1 includes a main magnetic pole film 1a made of a soft magnetic film for exchanging signals with the magnetic disk 2, and a nonmagnetic block 1b that sandwiches the main magnetic pole film 1a.

1C, the upper surface of the main magnetic fence 1 is formed in an arc shape, and the end surface of the main magnetic pole film 1a is exposed at the uppermost end of this arc.

By the way, when the magnetic head 10 configured as described above is operated, the main magnetic pole 1 comes into sliding contact with the magnetic disk 2 under a predetermined pressure. Abrasion powder of the non-magnetic material forming the main pole 1 is generated. Furthermore, depending on the installation status of the magnetic recording/reproducing device, dust in the air may also be mixed in with the abrasion powder. If these wear particles enter between the magnetic disk 2 and the main magnetic pole 1 (particularly the main magnetic pole film 1a), the envelope waveform will be disturbed during playback, and in severe cases, the main magnetic pole 1 (main magnetic pole film 1a) will be damaged. Sometimes it gives.

(Objective) In view of the above circumstances, an object of the present invention is to maintain a good reproduction envelope and prevent damage to the magnetic poles when the magnetic head and the magnetic recording medium are in sliding contact with each other. The purpose is to provide magnetic heads made with

(Summary) In order to achieve the above object, the present invention provides a groove-shaped recess, for example, in the vicinity of a magnetic pole for transmitting and receiving a signal magnetic field to and from a magnetic recording medium, and traps wear particles etc. in this recess. The magnetic pole is characterized in that by dropping the magnetic pole, the negative influence of the abrasion powder and the like on recording/reproduction signals is eliminated, and the magnetic pole itself is protected.

(Examples) The present invention will be described below based on illustrated examples. In the following embodiments, a case will be described in which the present invention is applied to an auxiliary magnetic pole excitation type perpendicular magnetic head.

The main magnetic pole used in the auxiliary magnetic pole excitation type perpendicular magnetic head system according to the first embodiment of the present invention is constructed as shown in FIG. 1 (the auxiliary magnetic pole is omitted). That is, as shown in FIG. 1, the main magnetic pole 50 has a house shape as a whole, and is formed into a thin rectangular main magnetic pole by a first block 11a and a second block 11b made of non-magnetic material. It has a structure in which the membrane 12 is sandwiched. The main magnetic pole 50
The upper part is roof-shaped, and the top of the head is formed into a predetermined shape to form a medium sliding contact surface 13. In this example, the medium sliding contact surface 13 has a substantially rectangular shape (in the figure) with the long side along the moving direction of the magnetic disk 2, and the short side of the medium sliding contact surface 13 and the substantially rectangular shape are located in the center. One end surface 12a of the main magnetic pole film 12 is exposed in parallel with the main magnetic pole film 12, and serves as a portion for transmitting and receiving signals to and from the magnetic disk 2. Two grooves 13a and 1i are formed at both sides of the end surface 12a, substantially parallel to the longitudinal direction of the end surface 12a (ie, the width direction of the main pole film 120), and have a predetermined width and depth.

The side view of FIG. 2 shows how the magnetic disk 2 slides against the main magnetic pole 50 constructed in this way. That is, as shown in FIG.

The magnetic disk 2 moves in the direction of the arrow X while slidingly contacting the medium sliding contact surface 13 of the main magnetic pole 50. If the device is continued to be used in this state, wear particles and the like will eventually be generated due to the friction between the main pole 50 and the magnetic disk 2.

This wear powder first adheres to the vicinity of the ridgeline where the slope of the left side of the main magnetic pole 50 (that is, the upstream side with respect to the movement of the magnetic disk 2, the same applies hereinafter) and the plane of the medium sliding contact surface 16 intersect. This becomes abrasion powder 14. Further, as the magnetic head continues to be used, the adhered abrasion particles 14 will eventually peel off and enter between the magnetic disk 2 and the medium sliding surface 13. but,
Since the particles of the detached adhered wear powder are small, they are caught in the grooves 13a as wear powder 14a and fall, and do not reach the end face 12a of the main pole film 12.

Similarly, wear powder generated on the right side of the end face 12a (that is, on the downstream side with respect to the movement of the magnetic disk 2, the same applies hereinafter) is also caught in the groove 13b as wear powder 14b and falls.
After one rotation of the magnetic disk 2, the attached abrasion powder 14
It is possible to reduce the amount of adhesion by circulating it to the location where it is adhering.

Incidentally, the wear powder accumulated in the grooves 13a and 13b may be removed by cleaning as appropriate, or the wear particles may be removed from the main magnetic pole 50.
It is also possible to form a groove having a sufficient volume even if the main magnetic pole 50 is used for a service life of 1, and then replace the main pole 50 itself after the service life has elapsed.

Next, a second embodiment of the present invention will be described based on FIG. FIG. 3 is a plan view of this embodiment viewed from the direction of the medium sliding surface. It should be noted that this embodiment and a third embodiment described below have the same structure as the first embodiment, except for the groove which is a recess. Therefore, corresponding parts are simply given the same reference numerals to avoid redundant explanation.

As shown in FIG. 5, from the center of the left short side of the medium sliding contact surface 13A, which is a rectangular shape with the long side (horizontally long in the figure) having the long side in the direction along the moving direction of the recording medium of the main magnetic pole 50A, A linear groove 21a is formed as a recess from the left side of the long side, and a groove 21a is formed as a recess from the center of the short side to the upper long side of the rectangle. A straight groove 21b is formed.

When the two grooves 21a and 21b are formed in this manner, wear particles and the like are removed from the grooves 21a as in the first embodiment.

21b K can be caught and dropped. Furthermore, the running direction of the magnetic disk (the direction indicated by the arrow X) and the groove 2
Since the angle formed with the directions 1a and 21b is relatively small,
Abrasion powder and the like accumulated in the grooves 21a and 21b are easily discharged outward from the downstream ends 21f and 21g with respect to the movement of the medium in the grooves.

Further, the end surface 12a of the main pole film 12 is attached to the medium sliding contact surface 13A.
so that it is approximately symmetrical to the grooves 21a and 21b with the
As shown in the figure, grooves 21c and 21d shown by two-dot chain lines are formed, or on the right side of the end surface 12a of the main pole film,
If a groove 21e is formed parallel to the same end surface 12a, the first
Similarly to the above embodiment, wear particles generated near the end surface 12a of the main pole film can be captured and dropped into the groove 21ct21ds21e.

Next, a third embodiment of the present invention will be described based on FIG. 4.

As shown in FIG. 4, the medium sliding contact surface 13B of the main pole 50B
, on the left side of the end surface 12a of the main magnetic pole film 12,
Two rows of cylindrical recesses 31a, 31b, 31c parallel to a.
.

31d, 31e and 32a, 32b, 32c,
Further, on the right side of the end surface 12a, two rows of cylindrical recesses 33a to 35d and 34a to 35d are formed.
54e is formed.

These cylindrical recesses 11a to 31e and 32a to 32d
This means that any cylindrical recess is formed on the surface of the medium sliding contact surface 13B when viewed from the running direction of the magnetic disk (direction indicated by arrow Abrasion powder, etc. carried from the direction of the arrow X (i.e., the upstream side with respect to the movement of the recording medium) is caught in any of the cylindrical recesses 31a to 31e, 52a to 52d, and dropped therein. becomes. Further, the cylindrical recesses 35a to 35d, 34a to 54e are also arranged in the same manner as the cylindrical recesses 31a to 31e, 32a to 52d. Therefore, these recesses 35a to 55d
, 34a to 34e, as in the first embodiment described above, abrasion particles and the like generated on the downstream side with respect to the movement of the medium are captured, and there is no risk that these particles will circulate to the upstream side and accumulate.

In addition, the above-mentioned No. 1. In the second embodiment, all the recesses are formed as linear grooves, but the same effect can be achieved by forming them into curved grooves as long as the processing means are available.

Needless to say, it can be applied to longitudinal recording systems and magneto-optical recording systems.

(Effects) According to the present invention, abrasion particles generated from magnetic recording media and magnetic heads, dust in the air, etc. are captured and dropped into the recess provided near the signal transmitting/receiving section, so that the abrasion particles, etc. The magnetic recording medium does not enter between the signal transmitting/receiving section and the magnetic recording medium, and good magnetic recording and reproduction can be performed. Further, it is possible to avoid the possibility that the abrasion powder and the like may damage the signal transmitting/receiving section of the magnetic head.

[Brief explanation of the drawing]

1 is a perspective view showing a magnetic head (main magnetic pole) according to a first embodiment of the present invention; FIG. 2 is an enlarged side view of the main part of the magnetic head (main magnetic pole) shown in FIG. 1; 3 and 4 respectively show the second embodiment of the present invention. FIG. 5 is a plan view showing the magnetic head (main pole) of the third embodiment, and a side view showing an example of a conventional magnetic head. 2...Magnetic disk (magnetic recording medium) 1
0.1OA...Magnetic head 12...Main pole film 12a...End faces 13a, 13b, 21a, 21b, 21c, 21d, 2 of main pole film
1e...Groove (recess) 51a to 51e, 32a
~32d, 53a ~53d, 54a~54e...
・・・・・・・・・Cylindrical recess Figure 1, Figure %2

Claims (1)

[Claims] 1. A magnetic head comprising a recess near a portion of the magnetic head that transmits and receives signals to and from a magnetic recording medium.