JP3435724B2 - Rotating magnetic head drum and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head drum used in a magnetic recording / reproducing apparatus such as a video tape recorder (VTR) and a digital audio tape recorder (DAT), and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, such a rotary magnetic head drum is constructed, for example, as shown in FIG. In FIG. 4, the rotary magnetic head drum 1 is
The magnetic head 3 has a rotating drum 4 that rotates integrally with the magnetic head 3, and a fixed drum 6 that guides the magnetic tape 5 to travel around the magnetic head 3.

In the rotary magnetic head drum 1 thus constructed, the magnetic tape 5 is spirally wound around the cylindrical outer peripheral surfaces of the rotary drum 4 and the fixed drum 6, and the magnetic tape 5 is indicated by an arrow. As shown, the rotary drum 4 is run diagonally at a predetermined speed, and the rotary drum 4 is rotated around the central axis 2 in the direction of arrow B at a high speed. As a result, the magnetic head 3 performs magnetic recording or reproduction on the magnetic substance of the magnetic tape 5 by helically scanning the tape 5.

At this time, the rotary drum 4 has a very high relative velocity with respect to the magnetic tape 5, and an air flow is present between the outer peripheral surface of the rotary drum 4 and the magnetic tape 5. Occur. For this reason, the magnetic tape 5 is repeatedly partially floated and contacted with the outer peripheral surface of the rotary drum 4. Further, since the fixed drum 6 has a relatively small relative speed with respect to the magnetic tape 5, the magnetic tape 5 is always in contact with the outer peripheral surface thereof.

In this way, the outer peripheral surfaces of the rotary drum 4 and the fixed drum 6 are worn by the friction with the magnetic tape 5. For this reason, the outer peripheral surfaces of the rotary drum 4 and the fixed drum 6 are configured to suppress the above-mentioned wear and reduce friction with the magnetic tape 5.

That is, the rotary drum 4 and the fixed drum 6 are constructed as follows, for example, according to Japanese Patent Laid-Open No. 2-121110. As shown in FIG. 5, the rotating drum 4 and the fixed drum 6 contain, for example, 3 to 12% by weight of silicon particles 7 finely contained in an aluminum base material, and the rotating drum 4 and the fixed drum 6 are fixed by turning. On the outer peripheral surface of the drum 6, tape guide surfaces 4a, 6a and a tape guide lead 6b are formed. In the tape guide surfaces 4a and 6a and the tape guide lead 6b, the silicon particles 7 contained in the aluminum base material are exposed on the surfaces thereof.

As shown in FIG. 6, the rotary drum 4 and the fixed drum 6 thus formed are accelerated with high energy by ion implantation into the tape guide surfaces 4a, 6a and the tape guide leads 6b. The implanted nitrogen ions or oxygen ions are implanted. As a result, aluminum nitride 8 and silicon nitride 9 are produced on the surfaces of the tape guide surfaces 4a and 6a and the tape guide lead 6b. The aluminum nitride 8 and the silicon nitride 9 have a depth of about several μm.

In the thus constructed rotary magnetic head drum 1, the surfaces of the tape guide surfaces 4a and 6a of the rotary drum 4 and the fixed drum 6 and the tape guide lead 6b are made of the aluminum nitride 8 and the silicon nitride 9. It is covered by a hardened layer. As a result, the wear resistance and frictional characteristics for the magnetic tape 5 are improved.

[0009]

However, according to such a rotary magnetic head drum, a so-called forging / pressing step is necessary in order to uniformly mix the silicon grains into the aluminum base material. Therefore, there is a problem that the number of steps is increased and the manufacturing cost is increased.

The hardened layer formed on the outer peripheral surfaces of the rotary head and the fixed head is made of aluminum nitride or silicon nitride. Therefore, the hardness of this hardened layer cannot be said to be sufficient, and some wear was unavoidable.

Further, since the material of the magnetic head drum is limited to aluminum, there is a problem that the range of selection of the material is narrow.

In view of the above points, the present invention provides a rotary magnetic head drum, which is further improved in wear resistance and frictional characteristics, has a wide range of materials to be selected, and is reduced in cost. It is intended to provide a manufacturing method thereof.

[0013]

According to the present invention, the above object has a rotary drum that rotates integrally with a magnetic head and a fixed drum that guides the running of a magnetic tape. The rotary drum and the fixed drum In the rotating magnetic head drum, the material of is made of non-magnetic metal such as aluminum or aluminum alloy. Alternatively, it is achieved by a rotary magnetic head drum having a hardened layer formed by implanting ions of any one of oxygen and oxygen of the group III to VI metal.

Further, according to the present invention, the above object has a rotary drum that rotates integrally with a magnetic head, and a fixed drum that guides the running of a magnetic tape, and the materials of the rotary drum and the fixed drum are: In the method for manufacturing a rotating magnetic head drum made of a non-magnetic metal such as aluminum or an aluminum alloy, the surface of the non-magnetic metal as a material of the rotating drum and the fixed drum is subjected to ion implantation to remove nitrogen, carbon or oxygen. It is also achieved by the method for manufacturing a rotary magnetic head drum that a hardened layer is formed by implanting ions of any of the III to VI metals together with implanting any of the ions.

Preferably, the ion implantation is, for example, 1
It is performed with high energy of 0 keV or more.

Preferably, the group III-VI metal is T
i or Cr. Then, preferably, the hardened layer is further subjected to an overlapping treatment with gas ions.

[0017]

According to the above construction, the contact surfaces of the rotary drum and the fixed drum with respect to the magnetic tape are made of non-magnetic material which constitutes the material by ion implantation of nitrogen, carbon or oxygen ions and Group III to VI metals. It will be covered by a hardened layer consisting of a compound of metal and these ions.

When the ion implantation is performed at a high energy of, for example, 10 keV or more, the hardened layer is
It will be formed from the surface of the non-magnetic metal to a depth of several μm.

The group III-VI metal is Ti or Cr.
When the hardened layer is TiN, TiC, TiO ₂
Alternatively, it is composed of CrN, CrC, and CrO ₂ .

When the above-mentioned hardened layer is further subjected to a layering treatment with gas ions, the hardened layer is composed of various kinds of components.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows an embodiment of a rotary magnetic head drum according to the present invention. In FIG. 1, the rotary magnetic head drum 10 has a magnetic head 1 with respect to a central axis 11.
It has a rotating drum 13 that rotates integrally with the motor 2, and a fixed drum 15 that guides the magnetic tape 14 to travel with respect to the magnetic head 12.

In the rotary magnetic head drum 10 constructed as described above, the magnetic tape 14 is spirally wound around the cylindrical outer peripheral surfaces of the rotary drum 13 and the fixed drum 15, and the magnetic tape 14 is indicated by an arrow A. the central axis 11 causes travel at a predetermined speed in a direction, the rotary drum 13 shown in
Rotate around in the direction of arrow B at high speed. As a result, the magnetic head 12 helically scans the magnetic tape 14 and performs magnetic recording or reproduction on the magnetic material.

According to the present embodiment, the rotary drum 13 and the fixed drum 15 are constructed as follows. First, as shown in FIG. 2, the rotating drum 13 and the fixed drum 15 are formed by turning a base material made of aluminum, an aluminum alloy, or other non-magnetic metal, to form outer peripheral surfaces of the rotating drum 13 and the fixed drum 15. Then, the tape guide surfaces 13a and 15a and the tape guide lead 15b are formed.

As shown in FIG. 3, the rotary drum 13 and the fixed drum 15 formed in this manner have a height of 10 keV or more by ion implantation with respect to the tape guide surfaces 13a and 15a and the tape guide lead 15b. Energy-accelerated gas ions 16 of one of nitrogen, carbon, and oxygen are implanted, as well as metal ions 17 of one or both of the III to VI metals, such as Ti and Cr.

As a result, the tape guide surfaces 4a and 6a are formed.
On the surface of the tape guide lead 6b, for example, titanium nitride (TiN), chromium nitride (CrN), titanium carbide (TiC), chromium carbide (CrC), titanium oxide (TiO ₂ ), chromium oxide (CrO ₂ ). Will be generated. Thus, the hardened layer 18 is formed on the surfaces of the tape guide surfaces 13a and 15a of the rotary drum 13 and the fixed drum 15 and the tape guide lead 15b.

The hardened layer 18 may be formed as a hardened layer containing various kinds of components by subjecting it to a layering treatment with another gas ion.

In the rotary magnetic head drum 10 manufactured as described above, the rotary drum 13 and the fixed drum 15 are provided.
Tape guide surfaces 13a, 15a and tape guide lead 1 of
The surface of 5b is covered with the hardened layer 18.

In this case, the hardened layer 18 is made of titanium nitride (TiN), chromium nitride (CrN), titanium carbide (TiC), chromium carbide (CrC), titanium oxide (TiO ₂ ), or chromium oxide (CrO). ₂ ) Besides,
It contains a non-magnetic metal nitride, carbide or oxide that is the base material.

As a result, the rotating drum 13 and the fixed drum 15 are in contact with the magnetic tape 14, that is, the tape guide surfaces 13a and 15a and the tape guide lead 1.
The wear resistance and frictional properties of the surface of 5b are improved.

Since the hardened layer 18 has sufficient hardness due to metal ions by ion implantation, a non-magnetic metal is used as the base material in addition to the conventionally used aluminum and aluminum alloy. Will be.
Thus, the hardened layer 18 having a uniform structure can be easily obtained, and the hardened layer 18 can suppress the shape change of the rotary drum 13 and the fixed drum 15 to be extremely small.

As described above, in this embodiment, the contact surfaces of the rotary drum and the fixed drum with respect to the magnetic tape are made of the non-magnetic metal constituting the material, the ions of nitrogen, carbon or oxygen, and the groups III to VI. Covered by a hardened layer consisting of a compound with metal ions. Therefore, the wear resistance of the surface of this contact surface is enhanced and the friction characteristics are improved. Thus, stable tape running performance can be obtained.

Further, unlike the conventional rotary magnetic head drum, the material of the rotary head and the fixed head is not limited to aluminum or aluminum alloy, and non-magnetic metal is used. Can be widened. As a result, the cost of the base metal forging / pressing is not necessary, and the cost is further reduced.

Further, the ion implantation is performed, for example, at 10 ke.
When it is performed at a high energy of V or more, the hardened layer is formed to a depth of several μm from the surface of the nonmagnetic metal, and a hardened layer having a sufficient thickness can be obtained.

Further, when the group III-VI metal is Ti or Cr, the hardened layer is made of TiN, TiC,
It is composed of TiO ₂ or CrN, CrC, CrO ₂ . Therefore, the hardened layer has higher hardness and improved wear resistance.

When the above-mentioned hardened layer is further subjected to a layering treatment with gas ions, the hardened layer is
It will be composed of many kinds of components. Thus, the hardened layer has further improved wear resistance and good wear characteristics.

[0037]

As described above, according to the present invention, the abrasion resistance and the frictional characteristics are further improved, the range of selection of the material is wide, and the manufacturing cost is reduced. A magnetic head drum and a manufacturing method thereof can be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a rotary magnetic head drum according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a main part of the rotary magnetic head drum of FIG.

3 is an enlarged cross-sectional view of a surface portion of the rotary magnetic head drum of FIG.

FIG. 4 is a schematic perspective view showing an example of a conventional rotary magnetic head drum.

5 is a partially enlarged cross-sectional view showing a main part of the rotary magnetic head drum of FIG.

6 is an enlarged cross-sectional view of a surface portion of the rotary magnetic head drum of FIG.

[Explanation of symbols]

10 rotating magnetic head drum 11 central axis 12 magnetic head 13 rotating drum 14 magnetic tape 15 fixed drum 16 gas ions 17 metal ions 18 Hardened layer

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A 2-121110 (JP, A) JP-A 3-290808 (JP, A) JP-A 60-124051 (JP, A) JP-A 63- 113853 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 15/61 G11B 15/60

Claims (4)

(57) [Claims] 1. A rotary drum that rotates integrally with a magnetic head, and a fixed drum that guides the running of a magnetic tape,
In a rotary magnetic head drum in which the material of the rotary drum and the fixed drum is made of non-magnetic metal, the non-magnetic metal used as the material of the rotary drum and the fixed drum is ion-implanted into the surface thereof with nitrogen, carbon or A rotary magnetic head drum, wherein a hardened layer is formed by implanting one of oxygen ions and a metal ion of titanium and / or chromium. 2. A rotary drum that rotates integrally with a magnetic head, and a fixed drum that guides the running of a magnetic tape,
In the method for manufacturing a rotary magnetic head drum, wherein the material of the rotary drum and the fixed drum is made of non-magnetic metal, nitrogen and carbon are applied to the surface of the non-magnetic metal used as the material of the rotary drum and the fixed drum by ion implantation. Alternatively, by implanting either ion of oxygen and implanting metal ion of titanium and / or chromium,
A method for manufacturing a rotary magnetic head drum, which comprises forming a hardened layer. 3. The method of manufacturing a rotary magnetic head drum according to claim 2, wherein the ion implantation is performed with high energy of 10 keV or more. 4. The method of manufacturing a rotary magnetic head drum according to claim 2, wherein the hardened layer is further subjected to a layering treatment with gas ions.