JP2003006804A - Magnetic head unit, optical pickup unit provided with the same, and recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head unit, an optical pickup unit provided with the same, and a recording/reproducing device such that the cooling of a magnetic head is carried out effectively. SOLUTION: The magnetic head unit has a magnetic core 13 and a coil 11 wound around the magnetic core 13, and a magnetic head 14 which records while carrying out the contact sliding to a magneto-optical disk is supported so as to be in the pressurized state by a suspension 16 to a magneto-optical disk. A metal slider part 16a is provided in the magnetic head 14 to carry out the contact sliding to the magneto-optical disk. The metal slider part 16a is connected to a suspension 16. The metal slider part 16a and the suspension 16 are formed by using one member with thermal conductivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head unit for recording or reproducing on a disk-shaped recording medium such as a magnetic recording medium or a magneto-optical recording medium, an optical pickup unit including the magnetic head unit, and a recording / reproducing apparatus. More specifically, it relates to cooling of heat generated in a magnetic head.

[0002]

2. Description of the Related Art A magnetic recording / reproducing apparatus or a magneto-optical recording / reproducing apparatus uses a magnetic disk or a magneto-optical disk as a disk-shaped recording medium to record an information signal on the disk or an information signal on the disk. To play.

A mini disk (hereinafter referred to as "MD"), which is a typical magneto-optical reproducing / recording apparatus, has a spindle motor (not shown) for rotating the magneto-optical disk 50 as shown in FIG. A rotation driving unit, a magnetic head 60 for applying a magnetic field based on information to be recorded, and an optical pickup 53 for irradiating the magneto-optical disk 50 with laser light to detect return light from the magneto-optical disk 50.
It has and.

The magnetic head 60 is shown in detail in FIG.
As shown in (a), a resin slider 62 integrally formed with the magnetic head 60 and molded with a resin material, a coil 61,
It includes a magnetic core 63 and a magnetic pole portion 64 made of a magnetic material. The magnetic pole portion 64 refers to the magnetic core 63 located at the position of the winding center of the coil 61, and a magnetic field is generated in the coil 61 and the magnetic pole portion 64 by passing a current through the coil 61. The magnetic head 60 used in the MD is a sliding magnetic head, and a sliding protrusion 65 that contacts the magneto-optical disk 50 is formed on the lower surface of the resin slider 62.

As shown in FIG. 7B, the sliding convex portion 65 has a step difference of usually 20 to 100 μm so as to protrude from the other portion of the resin slider 62. The reason for providing this step is that the magnetic core 63 of the magnetic head 60 is in direct sliding contact with the magneto-optical disk 50, and
This is to prevent damage to the. In other words, due to this step, as shown in FIG. 7C, a certain distance is provided between the magneto-optical disk 50 and the magnetic core 63, and the magnetic core 63 is warped or the thickness of the magneto-optical disk 50 varies. To prevent direct contact with the magneto-optical disk 50. Further, the sliding convex portion 65 that directly contacts the magneto-optical disk 50 is made of the same resin material as that of the resin slider 62, and has excellent slidability. Further, by forming the sliding convex portion 65 with a spherical surface having a radius of 5 to 10 mm, the contact area where the magneto-optical disc 50 and the sliding convex portion 65 come into contact with each other is reduced, and fluctuations in frictional force are prevented.

As shown in FIG. 6, the MD has an optical pickup 53 for irradiating a laser beam on one side with a magneto-optical disk 50 sandwiched therebetween, and a laser spot 52 on the other side.
The magnetic head holding portion 54 that moves in accordance with the position is arranged. The magnetic head holder 54 includes a magnetic head 60 and is connected to one end of a suspension 56, which is a head supporting member. The other end of the suspension 56 is connected to the optical pickup 53 via a substantially L-shaped connecting arm 58.

The magnetic head holding portion 54 is preloaded with a suspension 56 of 3 to 10 mN so that the magnetic head holding portion 54 can move by following the surface wobbling of the magneto-optical disk 50 or dust and lumps on the magneto-optical disk 50. Supported. Since the suspension 56 is made of a conductive elastic material, the suspension 56 can swing in accordance with the movement of the magnetic head holding portion 54.

In the MD having the above structure,
The recording of the information signal on the magneto-optical disk 50 is performed as follows. First, an electric current is passed through the coil 61 of the magnetic head 60 to perform electromagnetic conversion, and the coil 61 and FIG.
A magnetic field is generated in the magnetic pole portion 64 shown in FIG. The magnetic field generated at this time is modulated in the magnetic field direction according to the information signal, and this modulated magnetic field is applied to the magneto-optical disk 50 which is rotationally driven for recording.

The information signal on the magneto-optical disk 50 is reproduced as follows. First, the optical pickup 53
The laser light is emitted from a light source (not shown), and the laser light is focused on the magneto-optical disk 50 via the objective lens 51. The laser beam applied to the magneto-optical disk 50 is reflected by the polarization plane rotating based on the information on the magnetization direction recorded on the magneto-optical disk 50. The reflected light is guided to the light receiving section 55 through the objective lens 51, and the light receiving section 55 detects the rotation direction or the rotation amount of the polarization plane and is converted into an electric signal. Data is reproduced by generating a reproduction signal according to the electric signal.

By the way, in recent years, it is expected that the recording speed and recording density on a magnetic disk or a magneto-optical disk will be improved, so that the magnetic head 60 can generate a magnetic field at a higher frequency to increase the magnetic field strength for recording. It has been demanded. At the time of recording the information signal on the magneto-optical disk 50, heat is generated in the coil 61 and the magnetic pole portion 64 by electromagnetic conversion.

In order to increase the recording speed, when a current having a recording frequency exceeding several MHz is applied to the coil 61, the coil 61 is
The heat generated by the magnetic head 60 having the magnetic pole portion 64 increases. In addition, as a general tendency, as the recording density on the magneto-optical disk 50 increases, the recording magnetic field required for recording also increases. For this reason, it becomes necessary to flow more current through the coil 61.

In particular, as the recording density on the magneto-optical disk 50 has been increased and the recording speed has been increased in recent years, the electric power supplied to the coil 61 has increased. As a result, the heat generation of the magnetic head 60 increases, and the coil 61 is damaged and the magnetic characteristics of the magnetic core 63 are lost.

In order to reduce the heat generation of the magnetic head 60, in order to improve the magnetic field strength generated per unit current, that is, the magnetic field generation strength, the magnetic core 63 at the center of the winding of the coil 61 is made small and the magneto-optical disk 50. And a method of releasing heat generated by the magnetic head 60 can be considered.

The magnetic field strength generated in the magnetic core 63 has a characteristic that it greatly depends on the distance between the magnetic core 63 and the magneto-optical disk 50. The closer the distance is, the larger the magnetic field strength generated. Therefore, it is possible to bring the magnetic core 63 close to the magneto-optical disk 50 to increase the strength of the generated magnetic field and reduce heat generation. However, in order to reduce the distance between the magnetic core 63 and the magneto-optical disk 50, it is necessary to greatly improve the mechanical accuracy, and it is necessary to adjust the position of the laser spot 52 and the magnetic core 63 when the device is assembled. There was a problem that adjustment was required.

Therefore, the reduction of heat generation has been attempted exclusively by the method of releasing the heat generation in the magnetic head 60, and the method is disclosed in Japanese Patent Laid-Open Nos. 2000-331390 and 2000-276806. Has been done.

That is, in Japanese Patent Laid-Open No. 2000-331390, the heat generated in the coil and the magnetic pole portion is cooled by the air flow generated as the magneto-optical disk rotates. On the other hand, the heat conducted to the magnetic head is conducted from the magnetic head to the suspension through the heat conducting material between the magnetic head and the suspension. The heat conducted to the suspension is naturally dissipated from the surface of the suspension.

On the other hand, Japanese Unexamined Patent Publication No. 2000-276806 relates to a magneto-optical recording / reproducing apparatus provided with a flying magnetic head for flying a slider integrated with a magnetic head by an air flow accompanying the rotation of a magneto-optical disk. is there.
In this magneto-optical recording / reproducing apparatus, a heat dissipation layer of a heat conductive material electrically connected to the coil is formed on the surface of the slider facing the magneto-optical disk. The heat generated in the coil is radiated from the slider by utilizing the airflow accompanying the rotation of the magneto-optical disk, and the heat is diffused to the entire inside of the slider to promote the heat radiation effect.

[0018]

However, due to the recent increase in recording speed and the increase in recording density, the heat generation of the magnetic head is increasing, and the method for cooling the magnetic head disclosed in the above-mentioned publication does not. Even more effective cooling methods are needed.

In the above-mentioned Japanese Patent Laid-Open No. 2000-331390, only the coil and the magnetic pole portion are directly cooled by the air flow generated by the rotation of the magneto-optical disk. On the other hand, the heat conducted to the magnetic head is conducted to the suspension formed of a member different from the magnetic head to radiate the heat. That is, the above-mentioned publication has a problem that the cooling efficiency is not sufficient because there are few portions that are efficiently cooled by the airflow accompanying the rotation of the magneto-optical disk. Also, the cooling of the heat conducted to the magnetic head is
It is also performed by a suspension of another member connected to the magnetic head. Therefore, there is a problem that a heat conductive material that thermally couples the magnetic head and the suspension is required.

Further, in Japanese Patent Laid-Open No. 2000-276806, a slider integrated with a magnetic head is provided with a heat dissipation layer to cool the magnetic head. However, the technique of this publication has a problem that the cooling efficiency is not always good because the cooling is performed only in the heat dissipation layer.

The present invention has been made to solve the above conventional problems, and an object thereof is a magnetic head unit capable of effectively cooling a magnetic head, and an optical pickup unit including the magnetic head unit. And to provide a recording / reproducing apparatus.

[0022]

In order to solve the above-mentioned problems, a magnetic head unit of the present invention has a magnetic core and a coil wound around this magnetic core, and contacts a disk-shaped recording medium. The magnetic head that records while sliding
In a magnetic head unit supported by a head supporting member so as to be pressed against a disk-shaped recording medium, the magnetic head is provided with a sliding plate for sliding contact with the disk-shaped recording medium, The moving plate is connected to the head supporting member, and the sliding plate and the head supporting member are formed by one member having thermal conductivity.

According to the above invention, the magnetic head is provided with the sliding plate. Therefore, the heat generated by the current flowing through the coil is efficiently conducted from the magnetic core to the sliding plate. The heat conducted to the sliding plate is cooled by the airflow generated by the rotation of the disk-shaped recording medium arranged facing the sliding plate. Further, the sliding plate is connected to the head supporting member, and the sliding plate and the head supporting member are formed of one member having thermal conductivity. Therefore, the heat generated in the magnetic core is also conducted from the sliding plate to the head supporting member and is also cooled by natural heat dissipation from the surface of the head supporting member. Therefore, in the present invention, the heat generated in the magnetic core is cooled by both the sliding plate and the head supporting member, so that the cooling efficiency is improved by using these two members.

On the other hand, the air flow generated by the rotation of the disk-shaped recording medium reaches the head supporting member, but the cooling effect is low because the head supporting member is generally separated from the disk-shaped recording medium. However, in the present invention, the airflow hits the sliding plate in the vicinity of the disk-shaped recording medium, so that the cooling effect is high.

Further, the sliding plate and the head supporting member are formed of one member having thermal conductivity. Therefore, the heat conduction from the sliding plate to the head supporting member is performed more efficiently than in the case where the sliding plate and the head supporting member are formed separately and are joined with an adhesive. Furthermore, by forming the sliding plate and the head support member as one member,
The number of parts can also be reduced.

As a result, it is possible to provide a magnetic head unit capable of effectively cooling the magnetic head.

Further, the magnetic head unit of the present invention is characterized in that, in the above magnetic head unit, the sliding plate has a larger area than the magnetic core.

According to the above-mentioned invention, conventionally, the cooling by the air flow generated along with the rotation of the disk-shaped recording medium is mainly performed in the magnetic core portion, but in the present invention,
Since the sliding plate has a larger area than this, the cooling efficiency is high. In particular, since the sliding plate is plate-shaped, it is possible to increase the amount of air flow generated by the rotation of the disk-shaped recording medium.

Further, in the magnetic head unit of the present invention, in the magnetic head unit described above, the sliding plate is provided in direct contact with the magnetic core or is thermally provided via a member having excellent thermal conductivity. It is characterized in that it is provided in combination with.

As a result, when the sliding plate is in direct contact with the magnetic core, the heat generated in the magnetic core is directly transferred to the sliding plate. Further, when the sliding plate is thermally coupled to the magnetic core through a member having excellent thermal conductivity, the presence of the member having excellent thermal conductivity causes The generated heat is efficiently transmitted to the sliding plate.

Therefore, since the heat conduction efficiency from the magnetic core to the sliding plate is improved, the heat generated in the magnetic core is efficiently transmitted to the sliding plate, and the cooling by the air flow to the sliding plate and the head supporting member are performed. Is efficiently diffused.

Further, the magnetic head unit of the present invention is the above magnetic head unit, wherein the sliding surface of the sliding plate on the disk-shaped recording medium is formed with a spherical or semi-cylindrical sliding convex portion. It is characterized by being.

According to the above invention, it is possible to reduce the surface area of the sliding convex portion which is in sliding contact with the disk-shaped recording medium. That is, the spherical sliding protrusion contacts the disc-shaped recording medium at its apex, and the semi-cylindrical sliding protrusion linearly contacts the disc-shaped recording medium. As a result, the frictional force generated between the disc-shaped recording medium and the sliding protrusion can be reduced, and damage to the disc-shaped recording medium can be prevented.

The magnetic head unit of the present invention is characterized in that, in the above magnetic head unit, the sliding surface of the sliding plate is coated.

According to the above invention, the smooth coating film can further reduce the frictional force generated between the disc-shaped recording medium and the sliding convex portion, and prevent the disc-shaped recording medium from being damaged. .

The magnetic head unit of the present invention is characterized in that, in the above magnetic head unit, the sliding surface of the sliding member is plated with nickel.

According to the above invention, since the sliding surface of the sliding member is plated with nickel, sufficient sliding characteristics can be secured. Furthermore, since it is possible to prevent the sliding surface of the sliding convex portion from being changed due to oxidation of the metal surface of the sliding surface, it is possible to secure sufficient environmental resistance of the sliding surface.

An optical pickup unit of the present invention is characterized by including the above magnetic head unit.

According to the above invention, since the optical pickup unit includes the above magnetic head unit,
An optical pickup unit that can effectively cool a magnetic head can be provided.

The recording / reproducing apparatus of the present invention is characterized by including the above magnetic head unit or optical pickup unit.

According to the above invention, since the recording / reproducing apparatus includes the above magnetic head unit or optical pickup unit, it is possible to provide the recording / reproducing apparatus capable of effectively cooling the magnetic head. .

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. 1 to 4.
It is as follows.

As shown in FIG. 2, the recording / reproducing apparatus of this embodiment has an optical pickup unit having a magnetic head supporting mechanism 10. In the optical pickup unit, the magnetic head support mechanism 10 and the optical pickup 23 are connected by a substantially L-shaped connecting arm 25.

The magnetic head support mechanism 10 is shown in FIG.
As shown in (a), the metal slider portion 1 as a sliding plate
It has a magnetic head 14 provided with 6a, a suspension 16 as a head supporting member, and a fixing portion 17.
The magnetic head 14 is connected to one end of the suspension 16, and the other end of the suspension 16 is connected to the fixed portion 17. Further, the fixing portion 17 is provided with the connecting arm 25.
It is connected to the optical pickup 23 via.

Further, the magnetic head 14 of this embodiment is
This is a sliding type magnetic head that comes into contact with and slides on a magneto-optical disk 30 as a disk-shaped recording medium. The magnetic head 14 of the present embodiment, as shown in FIG.
By a, it slides in contact with the magneto-optical disk 30 and moves according to the position of the laser spot 22. Therefore,
The magnetic head 14 and the optical pickup 23, which are connected to each other by the connecting arm 25, are connected to each other by the magneto-optical disk 3
It means that they are arranged so as to face each other through 0.

Further, the suspension 16 uses beryllium-copper alloy as an elastic material and has a plate thickness of 40 μm. Metal slider portion 16a provided on the magnetic head 14
Is pressed against the magneto-optical disk 30 so as to come into contact with and slide against it, the suspension 16 supports the magnetic head 14 by applying a preload of 3 to 10 mN. This allows
The magnetic head 14 can move by following the surface wobbling of the magneto-optical disk 30 or dust or lumps on the magneto-optical disk 30.

On the other hand, the optical pickup 23 has a light source for irradiating a laser beam (not shown), an objective lens 21 for focusing the laser beam as a laser spot 22 on the magneto-optical disk 30, and a light receiving section 24. Light receiving part 24
Detects the laser light when the laser light applied to the magneto-optical disk 30 returns from the magneto-optical disk 30 to the optical pickup 23 via the objective lens 21 again.

Next, the structure of the magneto-optical disk 30 will be described. In the magneto-optical disk 30, for example, as shown in FIG. 3, a dielectric film 3 made of aluminum nitride is formed on a transparent substrate 31 made of a polymer material such as polycarbonate.
A magneto-optical recording layer 33 is provided via the two. The thickness of the dielectric film 32 is 65 nm. In addition, the magneto-optical recording layer 3
3 is made of GdFeCo and has a thickness of 50 nm. A thickness of 2 is formed on the magneto-optical recording layer 33.
A 0 nm dielectric film 32 is formed again, and a reflection film 34 made of aluminum or the like is further provided. Reflective film 3
The thickness of 4 is 100 nm.

A resin protective film 35 made of an ultraviolet curable resin and having a thickness of about 10 μm is formed on the reflective film 34.
Are formed. When using a sliding magnetic head,
A lubrication film 36 having high lubricity such as silicon oil is applied on the resin protection film 35. As a result, damage to the magneto-optical disk 30 caused by the sliding contact of the metal slider portion 16a in FIG. 2 with the magneto-optical disk 30 is prevented. As for the resin protective film 35 and the lubricating film 36, it is possible to provide both functions by one layer, in addition to the two layers as described above.

Next, the magnetic head 14 will be described.
The magnetic head 14 is made of copper, gold,
Coil 11 made of a conductive metal material such as aluminum
A bobbin 12 on which the coil 11 is wound, a magnetic core 13 and a magnetic pole portion 3 made of a magnetic material such as Mn-Zn ferrite, and a metal slider portion 16a that slides in contact with the magneto-optical disk 30. There is. The magnetic pole portion 3 is shown in FIG.
As shown in (b), the magnetic core 13 is located at the winding center of the coil 11. The coil 11 can be wound around the bobbin 12 and fixed as described above, but can be directly attached to the magnetic core 13 without using the bobbin 12.

By passing a current through the coil 11, a recording magnetic field is generated in the coil 11 and the magnetic pole portion 3.
The recording magnetic field is applied at a position where the laser light emitted from the optical pickup 23 toward the magneto-optical disk 30 is focused on the magneto-optical disk 30, as shown in FIG. Further, the applied magnetic field is modulated based on the information signal, and by applying the modulated magnetic field onto the magneto-optical recording layer 33 of the magneto-optical disk 30 shown in FIG. An information signal is recorded on the recording medium.

On the other hand, at the time of reproducing the information signal recorded on the magneto-optical recording layer 33 of the magneto-optical disk 30, as shown in FIG. 2, laser light is emitted from a light source (not shown) of the optical pickup 23. The irradiated laser light is focused on the magneto-optical recording layer 33 of the magneto-optical disk 30 shown in FIG. 3 via the objective lens 21. At this time, the magneto-optical recording layer 33
The polarization plane of the laser light is rotated based on the information of the magnetization direction recorded above, and the laser light having the rotated polarization plane is reflected. After that, this reflected light is transmitted through the objective lens 21.
It is incident on the light receiving section 24 of the optical pickup 23, and the rotation direction or rotation amount of the polarization plane is detected and converted into an electric signal. Further, a reproduction signal is generated according to this electric signal, and the data on the magneto-optical recording layer 33 is reproduced.

The metal slider portion 16a is provided so as to slide in contact with the magneto-optical disk 30. The suspension 16 and the metal slider portion 16a are
It is formed of one member having thermal conductivity. As described above, the suspension 16 is made of an elastic material and a beryllium-copper alloy that is a heat conductive member. Therefore, the metal slider portion 16a made as one member together with the suspension 16 is also made of beryllium-copper alloy and has excellent thermal conductivity.

As described above, the suspension 16 and the metal slider portion 16a are made of one member, that is, a part of the suspension 16 is formed as the metal slider portion 16a, and the suspension also serves as a slider. Unlike the related art, it is not necessary to connect the suspension 56 and the resin slider 62 with an adhesive member such as an adhesive. In addition, the conventional resin slider 62 itself is not required, and the number of constituent members of the magnetic head support mechanism 10 can be reduced to reduce the cost.

As shown in FIG. 1A, the metal slider portion 16a has the metal slider portion 16a.
Sliding protrusion 1 that is a small protrusion on the surface that slides against 0
Is provided. The sliding protrusion 1 makes sliding contact with the lubricating film 36 of the magneto-optical disk 30 shown in FIG. By providing the sliding convex portion 1, the magnetic core 13 and the magneto-optical disk 3 are provided.
A certain distance is provided so as not to directly contact 0. Therefore, even if the magneto-optical disk 30 is warped or the thickness is varied, the magneto-optical disk 30 and the magnetic core 13 do not come into contact with each other, so that the magneto-optical disk 30 is prevented from being damaged.

In this embodiment, the amount of protrusion of the sliding protrusion 1 is set to 30 to 50 μm. In particular, when it is necessary to bring the magnetic pole portion 3 of the magnetic core 13 and the magneto-optical disk 30 close to each other, the thickness can be set to 20 μm.

The shape of the tip of the sliding protrusion 1 is a spherical surface having a radius of 1 to 3 mm. By making the tip of the sliding projection 1 spherical, the contact area of the sliding projection 1 that is in sliding contact with the magneto-optical disk 30 can be reduced, and scratches on the surface of the magneto-optical disk 30 due to frictional force can be prevented. .

As described above, the sliding convex portion 1 may have a spherical shape, but may have a semicylindrical shape. It suffices that the area in contact with the magneto-optical disk 30 is small and the frictional force generated by the contact can prevent the surface of the magneto-optical disk 30 from being damaged.

On the other hand, the metal slider portion 16a has a structure shown in FIG.
As shown in (a) and (b), the opening 4 is provided. The magnetic field generated in the coil 11 and the magnetic pole portion 3 passes through the opening 4 and is applied onto the magneto-optical disk 30 shown in FIG. 3, and an information signal is recorded on the magneto-optical disk 30. The coil 11 and the magnetic pole portion 3 are the metal slider portion 16a.
When it is entirely covered by the metal slider 16
There is a possibility that a may adversely affect or weaken the AC magnetic field generated from the coil 11 and the magnetic pole portion 3. Therefore, the opening 4 is provided in the metal slider portion 16a to keep the magnetic field applied to the magneto-optical disk 30 normal.
Good recording and reproduction are performed. If the metal slider portion 16a is made of a material that does not affect the magnetic field, the opening 4 need not necessarily be provided.

The metal slider portion 16a is composed of the magnetic core 1
3 is in direct contact with the position 3 other than the opening 4. Direct contact between the metal slider portion 16a and the magnetic core 13 allows the metal slider portion 16a and the magnetic core 1 to be in contact with each other.
3 are thermally coupled to each other, and the heat generated in the magnetic core 13 is efficiently conducted to the metal slider portion 16a. Further, the metal slider portion 16a is formed in a plate shape,
The heat conducted to the metal slider portion 16a is applied to the magneto-optical disk 30 because it is closely opposed to the magneto-optical disk 30.
Is efficiently cooled by the air flow generated by the rotation of the. Further, heat is directly transmitted from the sliding convex portion 1 to the magneto-optical disk 30, and the magnetic core 13 is also cooled by this.

In order to cool the heat generated in the magnetic core 13 as efficiently as possible, it is necessary to transfer the heat generated in the magnetic core 13 to the metal slider portion 16a as much as possible. In order to improve the thermal conductivity from the magnetic core 13 to the metal slider portion 16a, it is desirable that the magnetic core 13 is in contact with the metal slider portion 16a in as much area as possible. In the present embodiment, the magnetic core 13 is provided with respect to the metal slider portion 16a as shown in FIG.
The slider contact portion 6 contacts at five points, and heat can be efficiently conducted.

The metal slider portion 16a and the magnetic core 1 are
Although it may be in direct contact with 3, as described above, it is also possible to make contact with 3 via a heat conductive member such as a heat conductive adhesive or a heat conductive adhesive tape. That is, even when the metal slider portion 16a and the magnetic core 13 are thermally coupled via the heat conducting member, the heat generated in the magnetic core 13 is conducted to the metal slider portion 16a. Metal slider section 16
The heat conducted to a is cooled by the air flow generated by the rotation of the magneto-optical disk 30, and as a result, the magnetic core 1
Efficient cooling of 3 is ensured.

Further, the metal slider portion 16a in contact with the magnetic core 13 can have a larger area than the magnetic core 13. The metal slider portion 16a, to which the heat generated in the magnetic core 13 is conducted, moves along with the rotation of the magneto-optical disk 30, and the metal slider portion 16a and the magneto-optical disk 30.
It is instantly cooled by the air flow generated between and. That is, the heat generated in the magnetic core 13 is applied to the metal slider portion 16
Since it is conducted and cooled to the whole a, the metal slider 1
The larger the area of 6a, the more efficiently the cooling by the air flow can be performed. In this embodiment, the magnetic head 14 includes a metal slider portion 16a having a larger area than the magnetic core 13, as shown in FIG. Therefore, the heat generated in the magnetic core 13 is conducted to the entire metal slider portion 16a having a larger area than the magnetic core 13, and is further efficiently cooled by the airflow accompanying the rotation of the magneto-optical disk 30. .

Further, since the suspension 16 and the metal slider portion 16a are composed of one heat conducting member,
The heat conducted from the magnetic core 13 to the metal slider portion 16a is also conducted to the suspension 16. As a result, heat is also naturally released from the surface of the suspension 16.

As described above, the present embodiment has the magnetic core 1
The heat generated in No. 3 is conducted to the metal slider portion 16a to be released, and the heat conducted to the metal slider portion 16a is further conducted to the suspension 16 to generate the suspension 16
The structure is such that heat can be released from the surface of the. Therefore, the heat generated in the magnetic core 13 is cooled by both the metal slider portion 16a and the suspension 16, so that good cooling efficiency can be obtained by using these two members.

Further, without using the bobbin 12, the coil 11
The same cooling effect can be obtained when the is directly attached to the magnetic core 13. That is, since the coil 11 is a conductive metal material, the heat generated in the coil 11 is conducted to the metal slider portion 16 a and the suspension 16 via the magnetic core 13. Metal slider portion 16a and suspension 16
The heat conducted to the metal slider portion 16a is the same as above.
And both the suspension 16 and the suspension 16 are efficiently cooled.

As described above, when the magnetic head 14 is sufficiently cooled, a large current can be passed through the coil 11, so that the recording magnetic field strength can be increased. Further, the recording data rate can be increased and the recording frequency can be increased, and the recording speed and recording density can be improved.
This makes it possible to use a multi-layer recording medium which is a magnetic super-resolution medium capable of high-density recording, and to record a moving image with higher image quality.

The magnetic head support mechanism 10 described above is
As shown in FIG. 2, the magnetic head 14 has a magneto-optical disk 3
It has a sliding type magnetic head that makes sliding contact with the surface of
However, the present embodiment is not limited to this, and the present embodiment can also be applied to a case where the magnetic head 14 is provided with a floating magnetic head that is levitated by an air flow generated by the rotation of the magneto-optical disk 30, for example. . Further, in the above-described embodiment, the magneto-optical recording / reproducing apparatus for recording / reproducing the magneto-optical disk 30 has been described, but the present invention is not limited to this.
For example, it is obvious that the present invention can be applied to a magnetic reproducing / recording apparatus for recording / reproducing a magnetic disk and a reproduction-only optical disk apparatus for an optical disk such as a compact disk.

[Second Embodiment] Another embodiment of the present invention will be described with reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

The magnetic head support mechanism 40 of this embodiment is different from that of the first embodiment, as shown in FIG. 5, as shown in FIG.
Is being applied.

As the coating 2, the metal slider portion 1
It is possible to apply nickel plating to the sliding surface of 6a. By forming a coating of nickel plating on the sliding protrusions 1 of the metal slider portion 16a, compared with the case where the sliding protrusions 1 are not coated with nickel plating, etc. It is possible to reduce the frictional force generated between the sliding protrusion 1. As a result, it is possible to secure the same sliding characteristics as in the conventional case in which the sliding convex portion 65 is formed with the resin having excellent slidability as shown in FIG. Damage can be prevented.

In addition to nickel plating, for example, diamond-like carbon (hereinafter referred to as "DLC") known as a surface coating material for hard disk media can be used as the coating 2. DLC is a coating material that has better slidability than nickel plating. Therefore, the sliding convex portion 1 is
By coating with, the frictional force generated between the magneto-optical disk 30 and the sliding convex portion 1 can be further reduced as compared with the case where the metal slider portion 16a is coated with nickel plating.

As described above, the coating 2 having excellent sliding characteristics is applied to the sliding protrusion 1 which is in sliding contact with the magneto-optical disc 30, so that the friction generated between the magneto-optical disc 30 and the sliding protrusion 1 is generated. The force can be reduced. as a result,
It is possible to secure substantially the same sliding characteristics as in the conventional case where the sliding convex portion 65 is formed of a resin having excellent slidability.

On the other hand, considering the manufacturing cost and manufacturing time of the device, it is possible to choose not to apply the coating 2 to the metal slider portion 16a. However, it can be considered that there is a sufficient advantage of applying the coating 2 to the metal slider portion 16a in view of a demand for reduction of spindle torque and reduction of power consumption due to recent downsizing of the device. Further, the coating on the surface of the metal slider portion 16a made of metal is easier than the coating on the resin surface, and the adhesion strength is high. Therefore, the sliding protrusion 1 and the magneto-optical disk 30 when the coating 2 is applied to the sliding protrusion 1 of the metal slider portion 16a.
The frictional force between and is equal to the frictional force between the conventional sliding protrusion 65 made of resin and the magneto-optical disk 50, or
It is also possible to make it equal or less.

As described above, the magnetic head supporting mechanism 40 of the present embodiment has the same structure as the magnetic head supporting mechanism described in detail in the first embodiment, and additionally the metal slider portion 16a.
The coating 2 is applied to the surface of the sliding protrusion 1 provided in the. Thereby, the magnetic head support mechanism 40 of the present embodiment can simultaneously obtain the sufficient cooling effect described in the first embodiment and the sufficient sliding characteristic of the sliding protrusion 1.

The coating material applied to the surface of the sliding protrusion 1 provided on the metal slider portion 16a is not limited to nickel plating or DLC, and any coating material having excellent sliding characteristics may be used. Therefore, it is obvious that the present embodiment can be applied to this embodiment.

[0077]

EXAMPLES Example 1 In this example, an experiment was conducted on the cooling capacity of the magnetic head 14 shown in the first embodiment under the following conditions. In this experiment, the suspension 16 and the metal slider portion 16a shown in FIGS.
In addition, a beryllium-copper alloy having elasticity is used. The plate thickness of the suspension 16 and the metal slider portion 16a is 40 μm. The metal slider portion 16a has a sliding projection 1 of 40 μm on the surface facing the magneto-optical disk 30,
The sliding protrusion 1 is a spherical surface having a diameter of 2 mm. As shown in FIG. 1B, three sliding protrusions 1 are formed on the metal slider portion 16a, and the sliding protrusions 1 and the magnetic core 13 are in contact with each other. Therefore, the magneto-optical disk 30 and the magnetic core 1
The distance to the magnetic pole portion 3 located at 3 is the sum of the plate thickness of the metal slider portion 16a and the convex amount of the sliding convex portion 1, and is set to about 80 μm in this embodiment. The cross-sectional area of the magnetic pole portion 3 is 0.3 mm × 0.2 mm, and the coil 11 is directly fixed to the magnetic core 13 with an adhesive without using a bobbin. The wire diameter of the coil 11 is 50 μm
Is. When a current is passed through the coil 11, the coil 11 and the magnetic core 13 generate heat. In this experiment, the current passed through the coil 11 has a drive frequency of 10 MHz and a current amplitude of ± 0.3.
A, current reversal time is 20 ns. In this experiment, the temperature rise of the magnetic head 14 when a current was applied to the coil 11 was compared between the conventional technique and the first embodiment. Specifically, as shown in FIG. 7A described in the related art, the temperature rise of the magnetic head 60 when the magnetic core 63 is embedded in the resin slider 62, and FIG. 1 described in the first embodiment. As shown in (a) and (b), the suspension 1
The temperature rise of the magnetic head 14 in the case of using the metal slider portion 16a made of the same heat conductive member as in No. 6 was compared.

Under the above conditions, an experiment was conducted at room temperature of 23 ° C. by adjusting the rotation of the magneto-optical disk 30 so that the linear velocity was 3 m / s. When the conventional magnetic core 63 is embedded in the resin slider 62, the temperature of the magnetic head 60 is 120
℃ rise. On the other hand, the magnetic head 14 of the first embodiment
The temperature rise was 75 ° C. Therefore, as described in the first embodiment, the magnetic slider 14 is attached to the magnetic head 14.
It has been found that the temperature rise of the magnetic head 14 is suppressed by providing 6a and thermally coupling.

Further, the frictional force generated between the magneto-optical disk 30 and the magnetic head 14 was evaluated under the same conditions as above. As a result of the experiment, the frictional force between the sliding convex portion 1 formed on the metal slider portion 16a used in the first embodiment and the magneto-optical disk 30 is formed on the conventional resin slider 62 shown in FIG. The frictional force between the sliding convex portion 65 and the magneto-optical disk 50 was larger than that. However, the frictional force of the sliding convex portion 1 formed on the metal slider portion 16a hardly changed before and after 20 million passes at the same location of the magneto-optical disk 30. Further, the depth of the scratch on the surface of the magneto-optical disk 30 caused by the sliding between the sliding protrusion 1 of the metal slider section 16a and the magneto-optical disk 30 is also about 0.3 μm, and the sliding formed on the metal slider section 16a. The durability of the convex portion 1 was sufficient. That is, the sliding characteristics in the first embodiment are sufficiently ensured.

Further, as described in the first embodiment, the metal slider portion 16a forming the sliding convex portion 1 is manufactured integrally with the suspension 16.
The manufacturing process is shorter than that of the method of manufacturing the resin slider 62 by molding using a mold, which can greatly contribute to cost reduction.

[Embodiment 2] In this embodiment, it occurs between the magneto-optical disk 30 shown in the second embodiment and the sliding protrusion 1 provided on the metal slider portion 16a shown in FIG. The friction force was evaluated by experiments. The frictional force was evaluated by comparison with the conventional technique. Specifically, as shown in FIG. 7A described in the related art, the frictional force of the sliding convex portion 65 provided on the resin slider 62 and the FIG. 5 described in the second embodiment are described. As shown, the frictional force when the sliding protrusion 1 of the metal slider portion 16a was plated with nickel was compared. Further, the frictional force of the sliding protrusion 1 of the uncoated metal slider portion 16a shown in FIG. 1 described in the first embodiment was also measured.

The frictional force of the nickel-plated sliding protrusion 1 and the non-coating sliding protrusion 1 was measured by applying a load of 5 mN by the suspension 16.
The rotation of the magneto-optical disk 30 was performed under the condition that the linear velocity was 3 m / s. Under this condition, when the frictional force at the end of 10,000 passes was measured at the same location on the magneto-optical disk 30, the frictional force when the sliding protrusion 1 was nickel-plated was 2.0 m.
The frictional force when N is N is 2.
It was 5 mN. In addition, the suspension 56 shown in FIG.
Is applied to rotate the magneto-optical disk 50 at a linear velocity of 3 m.
When the frictional force of the sliding protrusion 65 shown in FIG. 7A was measured as / s, the frictional force was 1.5 mN.

From these results, the conventional resin slider 6
It has been found that the frictional force of the sliding protrusion 65 of No. 2 and the frictional force when the sliding protrusion 1 of the metal slider portion 16a is plated with nickel have almost the same characteristics. Also, by plating the sliding protrusion 1 with nickel,
It was found that the sliding property superior to that in the case where the sliding protrusion 1 was not coated was obtained.

Under the same conditions as described above, the frictional force when a coating material having excellent sliding characteristics, such as diamond-like carbon, which is known as a surface coating material for hard disk media, is applied to the metal slider 16a. As a result of measurement, the frictional force generated between the magneto-optical disk 30 and the sliding convex portion 1 could be reduced to 1.1 mN.

As described above, it was confirmed that the heat generated in the magnetic head 14 can be efficiently cooled by providing the magnetic head 14 with the metal slider portion 16a. In addition, the sliding characteristics of the sliding protrusion 1 provided on the metal slider portion 16a are sufficiently ensured, and the sliding protrusion 1
It has been confirmed that does not damage the magneto-optical disk 30. Further, it was confirmed that by applying a coating material to the sliding protrusions 1 provided on the metal slider portion 16a, sliding characteristics equal to or less than those of the sliding protrusions 65 of the conventional resin slider 62 can be obtained. .

[0086]

As described above, in the magnetic head unit of the present invention, the magnetic head is provided with the sliding plate for contact sliding with the disk-shaped recording medium, and the sliding plate serves as the head supporting member. The sliding plate and the head supporting member that are connected to each other are formed of one member having thermal conductivity.

Therefore, since the heat generated in the magnetic core is cooled by both the sliding plate and the head supporting member, the cooling efficiency is improved by utilizing these two members.

Further, since the airflow hits the sliding plate in the vicinity of the disk-shaped recording medium, the cooling effect is high.

Further, since the sliding plate and the head supporting member are formed of one member having thermal conductivity, the sliding plate and the head supporting member are formed separately and are joined by an adhesive. The heat conduction from the sliding plate to the head support member is performed more efficiently than in the case of the above. Furthermore, the number of parts can be reduced by forming the sliding plate and the head support member as one member.

As a result, the magnetic head unit capable of effectively cooling the magnetic head can be provided.

Further, in the magnetic head unit of the present invention, in the above magnetic head unit, the sliding plate has a larger area than the magnetic core.

Therefore, the heat generated in the magnetic core is conducted to the sliding plate having a larger area than that of the magnetic core, so that the cooling efficiency is high and the sliding plate is plate-shaped, so that the disk-shaped recording is performed. It is possible to increase the amount of air flow generated by the rotation of the medium.

The magnetic head unit of the present invention is the above magnetic head unit, wherein the sliding plate is provided in direct contact with the magnetic core or is thermally provided via a member having excellent thermal conductivity. It is provided by being combined with.

Therefore, the heat conduction efficiency from the magnetic core to the sliding plate is improved, so that the heat generated in the magnetic core is efficiently transmitted to the sliding plate, and cooling by the air flow to the sliding plate and the head supporting member. The effect that the heat diffusion to the inside is efficiently performed.

Further, in the magnetic head unit of the present invention, in the above magnetic head unit, the sliding surface of the sliding plate on the disk-shaped recording medium is formed with a spherical or semi-cylindrical sliding convex portion. There is something.

Therefore, it is possible to reduce the frictional force generated between the disc-shaped recording medium and the sliding convex portion and prevent damage to the disc-shaped recording medium.

The magnetic head unit of the present invention is the above magnetic head unit, wherein the sliding surface of the sliding plate is coated.

Therefore, the smooth film formed by the coating can further reduce the frictional force generated between the disc-shaped recording medium and the sliding convex portion, and can prevent the disc-shaped recording medium from being damaged. .

The magnetic head unit of the present invention is the above magnetic head unit, wherein the sliding surface of the sliding member is nickel-plated.

Therefore, since the sliding surface of the sliding member is nickel-plated, there is an effect that sufficient sliding characteristics can be secured.

Further, an optical pickup unit of the present invention comprises the above magnetic head unit. Therefore, it is possible to provide an optical pickup unit capable of effectively cooling the magnetic head.

The recording / reproducing apparatus of the present invention includes the above magnetic head unit or optical pickup unit. Therefore, it is possible to provide a recording / reproducing apparatus capable of effectively cooling the magnetic head.

[Brief description of drawings]

1A is a side sectional view showing an embodiment of a magnetic head unit according to the present invention, and FIG. 1B is a bottom view of FIG.

FIG. 2 is a schematic sectional view showing an optical pickup unit including the magnetic head unit.

FIG. 3 is a cross-sectional view showing a structure of a magneto-optical disk which is recorded and reproduced by the optical pickup unit.

4 is a cross-sectional view showing a magnetic head in the magnetic head unit of FIG. 1 (a).

FIG. 5 is a vertical cross-sectional view showing a configuration of a main part of a magnetic head support mechanism in a magnetic head unit according to another embodiment of the present invention.

FIG. 6 is a schematic view showing a conventional magnetic recording / reproducing apparatus.

7A is a sectional view showing a resin slider integrated with a magnetic head, FIG. 7B is a partially enlarged view showing a sliding protrusion shown in FIG. 7A, and FIG. It is sectional drawing which shows the state which the resin slider shown to (a) slidably contacts with a magneto-optical disk.

[Explanation of symbols]

1 Sliding protrusion 2 coating 3 magnetic pole 4 openings 6 Slider contact part 10 Magnetic head support mechanism 11 coils 12 bobbins 13 magnetic core 14 magnetic head 16 Suspension (head support member) 16a Metal slider part (sliding plate) 17 Fixed part 30 magneto-optical disk (disk-shaped recording medium) 31 Transparent base 32 Dielectric film 33 magneto-optical recording layer 34 Reflective film 35 Resin protective film 36 Lubrication film 40 Magnetic head support mechanism

Claims (8)

[Claims] 1. A magnetic head having a magnetic core and a coil wound around the magnetic core for recording while slidingly contacting a disk-shaped recording medium. In the magnetic head unit supported so as to be in a pressed state, the magnetic head is provided with a sliding plate for contacting and sliding on the disk-shaped recording medium, and the sliding plate is connected to the head supporting member. The magnetic head unit is characterized in that the sliding plate and the head supporting member are formed of one member having thermal conductivity. 2. The magnetic head unit according to claim 1, wherein the sliding plate has a larger area than the magnetic core. 3. The sliding plate is provided so as to be in direct contact with the magnetic core or to be thermally coupled through a member having excellent thermal conductivity. 1. The magnetic head unit according to 1 or 2. 4. The sliding surface of the sliding plate on the disk-shaped recording medium is provided with a spherical or semi-cylindrical sliding convex portion. Magnetic head unit. 5. The magnetic head unit according to claim 4, wherein the sliding surface of the sliding plate is coated. 6. The magnetic head unit according to claim 5, wherein the sliding surface of the sliding member is plated with nickel. 7. An optical pickup unit comprising the magnetic head unit according to any one of claims 1 to 6. 8. A recording / reproducing apparatus comprising the magnetic head unit according to any one of claims 1 to 6 or the optical pickup unit according to claim 7.