JP2002230858A - Magnetic head unit and recording and reproducing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head unit which hardly gives rise to the deviation of a magnetic head in spite of exertion of impact thereto and has excellent impact resistance and a recording and reproducing device having the same. SOLUTION: A bottom end 9a of a magnetic head arm 9 is fixed by means of a screw 17 to a mounting portion 7a of a pickup housing 7. A coupling 16 is formed in a position nearer the magnetic head arm 9 in the mounting portion 7a of the pickup housing 7 (the position more distant from an objective lens 5), by which the centroid 14 (shown by a black dot for convenience in Figure) of the magnetic head unit 15 is made to exist on the perpendicular line of the central axis (i.e., the central axis of the screw 17) of the coupling 16. In other words, the coupling 16 is so formed as to exist on the perpendicular line of the centroid 14 of the magnetic head unit 15.

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 / reproducing a magneto-optical recording medium such as a magneto-optical disk and a recording / reproducing apparatus having the same.

[0002]

2. Description of the Related Art Hitherto, various types of optical disks as recording media have been put to practical use in terms of their recording / reproducing methods, disk diameters, and the like. Above all, with the development of magnetic super-resolution media and the like, magneto-optical disks (magneto-optical recording media) are capable of higher density recording than other optical disks capable of recording and reproducing. Therefore, in recent years,
A small-diameter magneto-optical disk represented by a mini disk (hereinafter, referred to as MD) has become the mainstream of demand.

Various types of recording / reproducing apparatuses for recording / reproducing on / from the above-mentioned magneto-optical disk have been put to practical use.
The recording / reproducing apparatus includes a magnetic head for generating a bias magnetic field or a magnetic field modulated by a magnetic field modulation method on a magneto-optical disk during recording. Therefore, a recording / reproducing apparatus (magneto-optical recording / reproducing apparatus) equipped with the above-described magnetic head is suitable for reproducing, for example, a read-only optical disk such as a compact disk (CD) or a digital versatile disk (DVD), or a phase transformation type recording medium. The structure is greatly different from the recording / reproducing apparatus provided with the pickup used.

[0004] Regarding the configuration of an MD device which is a typical (general) recording / reproducing device provided with a sliding type magnetic head,
This will be described below with reference to FIG.

A conventional recording / reproducing apparatus 130 shown in FIG.
It mainly comprises a magnetic head unit 115 and a pickup housing 107.

The magnetic head unit 115 includes a magnetic core 1
01 and a magnetic head coil 1 wound around a magnetic core 101
02, a slider 103 having the magnetic head 110 therein, a suspension 108, and a magnetic head arm 109. The magnetic head 110 is provided inside the slider 103 to apply a magnetic field to the recording / reproducing position of the magneto-optical disk 20, and moves on the recording surface of the magneto-optical disk 20. Further, the magnetic head unit 115 includes the magnetic head arm 1.
09 at the lower end 109a of the pickup housing 10
7 is connected. Pickup housing 1
07 is a magnetic head 110 with the magneto-optical disk 20 interposed therebetween.
And a laser irradiating / receiving unit 106 for irradiating the laser beam 104 to the recording / reproducing position of the magneto-optical disk 20 using the objective lens 105.

Therefore, the magnetic head 110 and the pickup housing 107 are sandwiched between the magneto-optical disk 20 and
Move to the corresponding recording / reproducing position and perform recording / reproducing.

In the recording / reproducing apparatus 130, recording / reproducing is performed by bringing the magnetic core 101 very close to the surface (sliding surface) of the magneto-optical disk 20. Therefore, for example, when the magnetic head 110 is separated from the surface of the magneto-optical disk 20 by a certain distance or more due to the recording / reproducing device 130 being subjected to vibration, shock, or the like, the recording / reproducing device 130 Playback cannot be performed.

The magnetic head unit 115 is fixed to the pickup housing 107 using, for example, a screw 117 or an adhesive.

At the time of reproduction, the magnetic head unit 115 is lifted up, etc.
There is also known a recording / reproducing apparatus having a configuration for retracting from above.

[0011]

However, in the above-mentioned conventional configuration, for example, the high-performance impact resistance required with the portable demand of a recording and reproducing apparatus for a magneto-optical disk, such as an MD, which is becoming smaller and lighter, is required. Not equipped.

That is, in the above-described conventional magnetic head unit and the recording / reproducing apparatus using the same, the position of the magnetic field generating region by the magnetic head 110 due to the impact due to dropping or runaway of the pick-up is changed to the spot position of the laser beam or the magneto-optical device. There is a problem that the position of the laser spot formed on the surface of the disk is shifted and recording / reproduction cannot be performed.

Further, in order to improve the data transfer speed in recent years, it is necessary to reduce the magnetic pole area to reduce the inductance of the magnetic head. For example, when recording with a sound quality comparable to a CD, a recording frequency of 1 MHz or less is sufficient. In the case of MD, the pole area is 0.9
The recording frequency is about several millimeters at the maximum when recording moving images at the same level as S-VHS. Thus, the magnetic pole area (the area where the magnetic field intensity required for recording can be obtained) must be reduced as the recording frequency required for the device increases, in other words, as the data recording speed increases. Considering that a moving image should be taken with the image quality equivalent to that of a DVD, the magnetic pole area is 0.2 mm × 0.2
mm.

Therefore, even if the displacement of the magnetic head 110 is slight, the magnetic field generation region generated by the magnetic head 110 does not coincide with the laser spot (recording / reproducing position) formed on the surface of the magneto-optical disk 20. Recording and playback cannot be performed.

A cause of the displacement of the magnetic head 110 is a connecting portion (connecting portion 116) between the lower end portion 109a of the magnetic head arm 109 and the pickup housing 107.
It is conceivable that a large impact force due to dropping, vibration, or the like was applied.

The recording / reproducing apparatus 130 includes a magnetic head 110
The magnetic field generating region given to the magneto-optical disk 20 is adjusted so that the spot position of the laser beam 104 and the position of the laser spot formed on the surface of the magneto-optical disk 20 coincide. At this time, the magnetic head unit 115 and the pickup housing 107
Is generally connected using a screw 117 or an adhesive after the position adjustment. However, since the magnetic head unit 115 is mounted vertically on the pickup housing 107, the magnetic head unit 1
The center of gravity of 15 is shifted to the magnetic head arm 109 side from the vertical line of the connecting portion between the magnetic head unit 115 and the pickup housing 107.

As described above, when the position of the center of gravity of the magnetic head unit 115 is separated from the connecting portion with the pickup housing 107, that is, from the vertical line of the connecting portion 116 serving as the rotation axis, the recording / reproducing apparatus 130 is subjected to an impact. When the magnetic head unit 115 is applied, the rotational moment applied to the magnetic head unit 115 increases, and the magnetic field generation region given by the magnetic head 110 matches the spot position of the laser beam 104 or the position of the laser spot formed on the surface of the magneto-optical disk 20. The problem of not doing so is likely to occur.

The connecting portion 116 is connected to the magneto-optical disk 20.
7, when the center of gravity 114 of the magnetic head unit 115 is separated from the connecting portion 116, as shown in FIG.
There is a problem that the pickup housing 107 and the like may be damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a magnetic head unit which is less likely to be displaced even when an impact is applied, and which is excellent in impact resistance. Recording and reproducing apparatus provided with the same.

[0020]

In order to solve the above-mentioned problems, a magnetic head unit according to the present invention comprises: a magnetic head for applying a magnetic field to a recording medium; and a magnetic head support having a connecting portion connected to a housing. Wherein the connecting portion is formed so as to be positioned on a vertical line of the center of gravity of the magnetic head unit.

According to the above arrangement, the magnetic head is less likely to be displaced by the shock caused by the drop, vibration, runaway of the pickup, etc. of the recording / reproducing apparatus, and the magnetic field generating area, the spot position of the laser beam, or the light It is possible to obtain a magnetic head unit having excellent impact resistance, which is unlikely to cause a problem that the recording / reproducing position formed on the surface of the magnetic disk does not coincide with the recording / reproducing operation.

That is, when the center of gravity of the magnetic head unit is located at a position separated from the vertical line of the connecting portion as in a conventional magnetic head unit, the position of the center of gravity of the magnetic head unit is determined from the vertical line of the connecting portion. As the distance increases, the magnetic head unit is generated by the impact, and the rotational moment about the connecting portion as the rotation axis increases. For this reason, when an impact is applied to the recording / reproducing apparatus, the position of the magnetic head is displaced, so that the magnetic field generating region generated from the magnetic head and the spot position of the laser beam or the recording / reproducing position formed on the surface of the magneto-optical disk are different. Do not match, and recording and reproduction cannot be performed.

On the other hand, in the magnetic head unit of the present invention,
Because the center of gravity of the magnetic head unit is located on the vertical line of the connecting part between the magnetic head unit and the housing, which is the rotation axis, even if a shock is applied to the recording / reproducing device, the rotational moment generated in the magnetic head unit by the shock is Can be made smaller than the rotational moment generated in the magnetic head unit.

Thus, even if an impact is applied to the recording / reproducing apparatus, it is possible to suppress the generation of a rotational moment generated in the magnetic head unit and having the connecting portion as a rotation axis.
Therefore, it is possible to obtain a magnetic head unit which is less likely to cause a displacement of the magnetic head and has excellent impact resistance.

It is more preferable that the connecting portion is formed at the position of the center of gravity of the magnetic head unit. This allows
When a shock is applied to the recording / reproducing apparatus, it is possible to minimize the generation of a torsional moment as well as a rotational moment generated at a connecting portion between the magnetic head unit and the housing. Therefore, it is possible to more reliably prevent the displacement of the magnetic head and prevent the housing from being damaged, thereby obtaining a magnetic head unit having excellent impact resistance.

The torsional moment is defined as the moment centered on the contact surface between the magnetic head support and the housing.
A moment generated when an impact is applied in a direction perpendicular or parallel to the sliding direction of the magnetic head. Depending on the direction of the impact applied to the magnetic head unit, torsional moments both perpendicular and parallel to the sliding direction of the magnetic head may be generated.

The magnetic head support is positioned so that the connecting portion is located on a vertical line of the center of gravity of the magnetic head unit.
It is more preferable that an extension is provided at a portion opposite to the portion supporting the magnetic head when viewed from the connection portion.

With this arrangement, the extension portion is provided on the heaviest magnetic head support portion among the members constituting the magnetic head unit, so that the center of gravity of the magnetic head unit coincides with the connection portion. Therefore, it is possible to minimize the generation of the rotational moment and the torsional moment generated in the connecting portion with a simple configuration. Therefore, it is possible to prevent a problem that the displacement of the position of the magnetic head is small and the position of the magnetic field generation region does not coincide with the spot position of the laser beam or the position of the laser spot formed on the surface of the magneto-optical disk. Further, it is possible to obtain a magnetic head unit having excellent impact resistance, which can prevent the recording / reproducing device including the housing from being damaged by the torsional moment.

The magnetic head supporting portion is positioned such that the connecting portion is positioned on a vertical line of the center of gravity of the magnetic head unit.
More preferably, a weight is provided at a portion opposite to the portion supporting the magnetic head when viewed from the connecting portion.

[0030] With this configuration, a simple configuration in which the weight is attached to the portion of the magnetic head support portion opposite to the portion that supports the magnetic head when viewed from the connection portion can reduce the rotational moment and the torsional moment generated in the connection portion. Occurrence can be suppressed. Therefore, it is possible to prevent a problem that the displacement of the position of the magnetic head is small and the position of the magnetic field generating area does not coincide with the spot position of the laser beam or the position of the laser spot formed on the surface of the magneto-optical disk.
Further, it is possible to obtain a magnetic head unit having excellent impact resistance, which can prevent the recording / reproducing device including the housing from being damaged by the torsional moment.

It is more preferable that the recording / reproducing apparatus of the present invention includes the magnetic head unit and a housing for fixing the magnetic head unit.

Thus, since the center of gravity of the magnetic head unit is located at the connection portion with the housing, even if a shock is applied to the recording / reproducing device, the connection portion is used as a rotation axis to rotate the magnetic head unit. Generation of a torsional moment about the moment and the connecting portion as a fulcrum can be suppressed. Therefore, it is possible to obtain a recording / reproducing apparatus in which the displacement of the magnetic head hardly occurs and which has excellent impact resistance.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following will describe one embodiment of the present invention with reference to FIG.

The recording / reproducing apparatus according to the present embodiment includes a magnetic head for generating a bias magnetic field or a magnetic field modulated by a magnetic field modulation method on a magneto-optical disk (recording medium) during recording. The configuration of the recording / reproducing device will be described below.

As shown in FIG. 1, the recording / reproducing device 30
A pickup housing (housing) 7 having an objective lens 5 and a laser irradiation / light receiving unit 6;
A slider 3 provided with a magnetic core 1 and a magnetic head coil 2 for generating a magnetic field is attached to the pickup housing 7 via a suspension 8 and a magnetic head arm 9. The slider 3 is located above the pickup housing 7. Therefore, the pickup housing 7 and the slider 3 are provided so as to face each other via the magneto-optical disk 20.

The laser irradiating / receiving unit 6 irradiates the laser beam 4 to the recording area of the magneto-optical disk 20 through the objective lens 5, and receives the reflected light from the recording area through the objective lens 5. .

The magnetic head arm 9 has a substantially U-shape. The lower end 9a of the magnetic head arm 9 is fixed to the mounting portion 7a of the pickup housing 7 by screws 17, while the upper end 9b is fixed to the upper end 9b. Suspension 8 is attached. The connection portion 16 between the magnetic head arm 9 and the pickup housing 7 will be described later in detail.

The suspension 8 has, for example, a thickness of 30 to
It is made of a 100 μm thin metal plate. The suspension 8 has a pressure of 3 to 10 mN so that the slider 3 can be pressed against the magneto-optical disk 20 with a constant pressure.
Is attached to the upper end 9b of the magnetic head arm 9 in a state where the preload is applied. The slider 3 is attached to the tip of the suspension 8. That is, the slider 3 includes the suspension 8 and the magnetic head arm 9.
And the like, and is fixed to the pickup housing 7. As a result, the slider 3 is caused to run out of the surface of the magneto-optical disk 20 or to be slightly raised, or
It slides (moves) on the magneto-optical disk 20 without being hindered by dust or the like adhering to the disk.

The magnetic core 1 can generate a magnetic field in a recording area located in a laser spot formed on the surface of the magneto-optical disk 20, that is, such that the recording area and the magnetic field generating area overlap. , Positioning is done. And a magnetic core 1 and a magnetic head coil 2
, A magnetic field generating unit is configured by the magnetic head generating unit, and the suspension 8 and the magnetic head arm 9 form a magnetic head supporting unit. The magnetic field generating unit, the slider 3, the magnetic head supporting unit, Thus, the magnetic head unit 15 is configured. Therefore, the above magnetic head unit 15
This is a sliding magnetic head.

A guide shaft 12 is provided at a predetermined position in the pickup housing 7, and a sub-guide 11 is provided in a positional relationship perpendicular to the guide shaft 12. The pickup housing 7 includes the guide shaft 1
2 is movable in the radial direction of the magneto-optical disk 20 while being guided by the sub-guide 11, so that a desired recording area on the magneto-optical disk 20 can be irradiated with the laser beam 4. I can do it.

The slider 3 mounted on the pickup housing 7 slides (moves) on the magneto-optical disk 20 so as to correspond to the position of the laser spot formed on the surface of the magneto-optical disk 20 while magneto-optically moving the slider 3. The recording area on the disk 20 is followed, thereby performing recording and reproduction on the recording area.

With the above configuration, the recording / reproducing device 30
The magneto-optical disk 20 is recorded and reproduced.
That is, at the time of recording, by irradiating the laser beam 4 to the magneto-optical disk 20, the recording area located in the laser spot is heated to the Curie point temperature or higher to lose its coercive force. The signal (information) is recorded in the recording area by reversing the direction of the magnetic field generated in step (1) in accordance with the recording signal. On the other hand, during reproduction, the magnetic head unit 1
5 is unnecessary, and the laser beam 4 is
While irradiating the recording area in, the signal (information) recorded in the recording area is reproduced by receiving the reflected light from the recording area.

The lower end 9a of the magnetic head arm 9 is
The pickup housing 7 is fixed to a mounting portion 7 a by a screw 17. That is, the connecting portion 16 between the magnetic head arm 9 and the pickup housing 7 is
Shows the part fastened by. The connecting portion 16
The mounting portion 7a of the pickup housing 7 is formed at a position closer to the magnetic head arm 9 (at a position farther from the objective lens 5), and thereby the center axis of the connecting portion 16 (that is, the center of the screw 17) is formed. The center of gravity (indicated by a black circle for convenience in the drawing) 14 of the magnetic head unit 15 is positioned on the vertical line of the axis). In other words, the connecting portion 16 is formed so as to be located on a vertical line of the center of gravity 14 of the magnetic head unit 15.

With the above configuration, when an impact is applied to the recording / reproducing apparatus 30, or when the pickup housing 7 is moved in the feed direction, the rotational moment of the magnetic head unit 15 around the connecting portion 16 is suppressed to a small value. be able to.

As a result, it is possible to prevent a magnetic field generating region generated from the magnetic head 10 from deviating from a spot position of the laser beam 4 or a laser spot position formed on the surface of the magnetic disk 20. Therefore, the recording / reproducing apparatus 30 using the magnetic head unit 15 of the present embodiment has a circular shape with the connecting portion 16 of the magnetic head 10 as a rotation axis even when high-speed access to the inner and outer peripheries is repeated or an impact is applied. The positional fluctuation in the circumferential direction can be made smaller than in the conventional magnetic head unit.

In the present embodiment, an example has been described in which the center of gravity 14 of the magnetic head unit 15 is on a vertical line of the connecting portion 16, but the present invention is not limited to this. Even if they do not completely coincide with each other on the vertical line, if the distance between the center of gravity 14 and the vertical line of the connecting portion 16 is shorter than the distance between the center of gravity and the vertical line in the conventional recording / reproducing apparatus, the magnetic head becomes more conventional. The rotational moment applied to the unit 15 can be reduced, and as a result, the displacement of the magnetic head 10 due to an impact or the like can be prevented.

However, by forming the position of the center of gravity 14 on the vertical line of the connecting portion 16 as in the present embodiment, it is possible to minimize the occurrence of a rotational moment about the connecting portion 16 as a rotation axis. It is more preferable to adopt the following configuration.

Further, in this embodiment, an example has been described in which the center of gravity 14 of the magnetic head unit 15 is on the vertical line of the connecting portion 16. However, by forming the magnetic head unit 15 so that the center of gravity 14 is located at the position of the connecting portion 16, the rotational moment about the connecting portion 16 from all directions generated in the magnetic head unit 15 by an impact can be minimized. It becomes possible to suppress. Thereby, the displacement of the magnetic head 10 can be more reliably prevented,
The magnetic head unit 15 and the recording / reproducing device 30 having excellent shock resistance can be obtained.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, members (structures) having the same functions as the members (structures) shown in the drawings of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the recording / reproducing apparatus 31 of the present embodiment, as shown in FIG. 2, the lower end 9a of the magnetic head arm 9 has a hanging portion (extended portion) 9c extending vertically downward at the end. I have. In other words, the recording / reproducing device 31 is opposite to the part supporting the magnetic head 10 as viewed from the connecting part 16 such that the magnetic head arm 9 is positioned on the vertical line of the center of gravity 14 of the magnetic head unit 18. Although the recording / reproducing apparatus 30 according to the first embodiment is different from the recording / reproducing apparatus 30 according to the first embodiment in that the hanging part 9c is provided on the side part, Same as 30.

With the above configuration, the magnetic head unit 1
The center of gravity 14 of 8 can be located on the vertical line of the connecting portion 16. Accordingly, it is possible to minimize the generation of a rotational moment about the connecting portion 16 as a rotation axis and a torsional moment about the connecting portion 16 as a fulcrum. Therefore, it is possible to prevent a problem that the magnetic field generated by the magnetic head 10 does not coincide with the spot position of the laser beam 4 or the laser spot (recording / reproducing position) on the surface of the magneto-optical disk 20 and recording / reproducing cannot be performed.

This torsional moment is generated when the center of gravity of the magnetic head unit 18 is separated from the connecting portion 16, and increases as the distance increases. In the recording / reproducing apparatus 31 of the present embodiment, when the connecting portion 16 is viewed from the opposite side of the magneto-optical disk 20, the center of gravity 14 of the magnetic head unit 18 is close to the connecting portion 16, as shown in FIG.

As a result, since a torsional moment is less likely to be generated in the connecting portion 16, it is possible to prevent a recording / reproducing defect due to a displacement of the magnetic head 10 and damage to the pickup housing 7.

Therefore, as in the present embodiment, by bringing the position of the center of gravity 14 of the magnetic head unit 18 close to the connecting portion 16, the generation of both the rotational moment and the torsional moment generated in the connecting portion 16 is suppressed, and furthermore the resistance is further improved. Magnetic head unit 18 and recording / reproducing device 3 excellent in impact property
1 can be obtained.

Third Embodiment Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, the first and second embodiments are described.
Members (configurations) having the same functions as the members (configurations) shown in the drawings are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, a weight 25 is attached to the lower end 9a of the magnetic head arm 9 of the recording / reproducing apparatus 32 of this embodiment. That is, the recording / reproducing device 32
The magnetic head arm 9 is attached to a portion opposite to the portion supporting the magnetic head 10 as viewed from the connecting portion 16 so that the connecting portion 16 is positioned on a vertical line of the center of gravity 14 of the magnetic head unit 19. Although the recording / reproducing apparatus 30 of the first embodiment is different from the recording / reproducing apparatus 30 of the first embodiment in that the weight 25 is provided, other components (configuration) are the same as those of the recording / reproducing apparatus 30 of the first embodiment.

With the above configuration, the magnetic head unit 1
9 can be located on the vertical line of the connecting portion 16. Accordingly, it is possible to minimize the generation of a rotational moment about the connecting portion 16 as a rotation axis and a torsional moment about the connecting portion 16 as a fulcrum. Therefore,
Due to the displacement of the position of the magnetic head 10, the magnetic field generation area and the spot position of the laser beam 4 or the magneto-optical disk 2
It is possible to prevent a problem that the laser spots (recording / reproducing positions) formed on the zero surface do not match and recording / reproducing cannot be performed.

Accordingly, the displacement of the position of the magnetic head 10 due to the rotational moment and the damage of the pickup housing 7 and the like due to the torsion moment can be prevented, and the magnetic head unit 19 and the recording / reproducing device 32 excellent in impact resistance can be obtained. .

When the weight 25 is attached to the magnetic head arm 9, the total weight of the pickup housing 7 is increased, which causes a decrease in the feed speed of the pickup. However, on the other hand, an increase in the weight of the magnetic head arm 9 has an effect of suppressing the vertical vibration of the magnetic head arm 9. Thus, the vibration transmitted to the magneto-optical disk 20 via the magnetic head arm 9 and the magnetic head 10 using the pickup actuator (not shown) as a vibration source can be effectively cut off.

Here, the effect of suppressing vibration before and after attaching the weight 25 will be described with reference to FIG. In FIG.
The vibration characteristics when a 5 g weight is attached to a 5 g magnetic head unit are shown. The upper row shows the measurement results of the recording / reproducing apparatus of the present embodiment, and the lower row shows the measurement results of the conventional recording / reproducing apparatus. This vibration characteristic represents a measurement result at the outermost peripheral position in the MD.

The graph of FIG. 5 shows a state in which the sliding magnetic head for MD is pressed against the magneto-optical disk directly above the objective lens, and the magnetic head is not rotated, but directly below the sliding magnetic head. Is measured by a laser Doppler vibrometer. As a vibration source of the magneto-optical disk, only vibration in the focus direction of the objective lens by a pickup actuator (not shown) is given.

From the graph showing the measurement results, among the magneto-optical disk vibration components showing changes before and after the weight is attached, particularly when focusing on the vicinity of 2 kHz, the vibration of the magneto-optical disk shows that the weight is attached. It can be seen that the vibration which was 0.13 μm before was reduced to 0.08 μm after mounting.

From the above results, as shown in FIG. 4, the weight 25 was attached to the lower end 9a of the magnetic head arm 9, and
Increasing the weight of the magnetic head unit 19 not only prevents displacement of the magnetic head 10 and damage to the magnetic head arm 9, the pickup housing 7, and the like, but also prevents the magneto-optical disk 2 from moving from the magnetic head arm 9.
It can be seen that the effect of suppressing the vibration transmitted to zero can also be obtained.

In the recording / reproducing apparatus of the present invention, the position of the center of gravity of the entire magnetic head unit including the magnetic field generator, the slider, the suspension, and the magnetic head arm used in the magneto-optical disk when viewed from the pickup feeding direction is as follows.
A magnetic head for magneto-optical recording and a magneto-optical recording / reproducing apparatus equipped with the magnetic head may be configured so as to be on a connecting portion with the pickup housing or on a vertical extension line of the connecting portion.

The recording / reproducing apparatus of the present invention is characterized in that in the above magnetic head unit, the magnetic head arm is bent a plurality of times so that the position of the center of gravity is on the connecting portion with the pickup housing or on a vertical extension line of the connecting portion. Magnetic head unit for magneto-optical recording and a magneto-optical recording / reproducing apparatus equipped with the same.

Further, in the recording / reproducing apparatus of the present invention, in the above magnetic head unit, a weight is added to the magnetic head arm such that the position of the center of gravity is on a connecting portion with the pickup housing or on a vertical extension line of the connecting portion. Magnetic head unit for magneto-optical recording and a magneto-optical recording / reproducing apparatus equipped with the same.

[0067]

As described above, the magnetic head unit of the present invention has a configuration in which the connecting portion is formed so as to be located on the vertical line of the center of gravity of the magnetic head unit.

Therefore, it is difficult for the position of the magnetic head to shift due to the shock caused by the drop, vibration, runaway of the pickup, etc. of the recording / reproducing apparatus.
This has the effect of providing a magnetic head unit with excellent shock resistance, which is unlikely to cause a problem that recording and reproduction cannot be performed because the spot position of the laser beam or the laser spot formed on the surface of the magneto-optical disk does not match.

It is more preferable that the connecting portion is formed at the position of the center of gravity of the magnetic head unit. Therefore, when a shock is applied to the recording / reproducing apparatus, the occurrence of a torsional moment as well as the rotational moment generated at the connection portion between the magnetic head unit and the housing can be minimized, and the displacement of the magnetic head can be more reliably reduced. This has the effect of preventing damage to the housing. Therefore, a magnetic head unit having excellent impact resistance can be obtained.

The magnetic head supporting portion has an extension at a portion opposite to the portion supporting the magnetic head as viewed from the connecting portion so that the connecting portion is located on a vertical line of the center of gravity of the magnetic head unit. Is more preferable.

Therefore, among the members constituting the magnetic head unit, the extension portion is provided on the heaviest magnetic head support portion so that the center of gravity of the magnetic head unit coincides with the connecting portion. Therefore, it is possible to minimize the generation of the rotational moment and the torsional moment generated in the connecting portion with a simple configuration. Accordingly, there is an effect that it is possible to prevent a problem that the displacement of the magnetic head is small, the magnetic field generating region does not coincide with the spot position of the laser beam, or the laser spot formed on the surface of the magneto-optical disk, and recording and reproduction cannot be performed. . further,
It is possible to obtain a magnetic head unit having excellent impact resistance, which can prevent the recording / reproducing device including the housing from being damaged by the torsional moment.

The magnetic head support is provided with a weight at a portion opposite to the portion supporting the magnetic head as viewed from the connection portion so that the connection portion is located on a vertical line of the center of gravity of the magnetic head unit. Is more preferable.

Therefore, with a simple structure in which a weight is attached only to the portion of the magnetic head supporting portion opposite to the portion supporting the magnetic head as viewed from the connecting portion, the rotational moment and the torsional moment generated in the connecting portion can be reduced. Occurrence can be suppressed. Accordingly, there is an effect that it is possible to prevent a problem that the displacement of the magnetic head is small, the magnetic field generating region does not coincide with the spot position of the laser beam, or the laser spot formed on the surface of the magneto-optical disk, and recording and reproduction cannot be performed. . Further, it is possible to obtain a magnetic head unit having excellent impact resistance, which can prevent the recording / reproducing device including the housing from being damaged by the torsional moment.

A recording / reproducing apparatus according to the present invention has the above-mentioned magnetic head unit and a housing for fixing the magnetic head unit.

Therefore, the center of gravity of the magnetic head unit is
Because it is located at the connection part with the housing, even if a shock is applied to the recording / reproducing apparatus, the connection part is used as a rotation axis, and the rotation moment generated in the magnetic head unit and the generation of a torsional moment using the connection part as a fulcrum are reduced. This has the effect that it can be suppressed. Therefore, it is possible to obtain a recording / reproducing apparatus in which the displacement of the magnetic head hardly occurs and which has excellent impact resistance.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a configuration of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing a configuration of a recording / reproducing apparatus according to another embodiment of the present invention.

FIG. 3 is a side view of a connecting portion of a magnetic head unit and a housing of the recording / reproducing apparatus of FIG. 2 as viewed from an opposite side of a magneto-optical disk.

FIG. 4 is a front view showing a configuration of a recording / reproducing apparatus according to still another embodiment of the present invention.

FIG. 5 is a graph showing a result of comparing the vibration suppression effect of the recording / reproducing apparatus of FIG. 4 and a conventional recording / reproducing apparatus.

FIG. 6 is a front view showing a configuration of a conventional recording / reproducing apparatus.

FIG. 7 is a side view of the connecting portion between the magnetic head unit and the housing of the conventional recording / reproducing apparatus of FIG. 6, viewed from the opposite side of the magneto-optical disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Magnetic head coil 3 Slider 4 Laser beam 6 Laser irradiation / light receiving part 7 Pickup housing (housing) 8 Suspension (magnetic head support part) 9 Magnetic head arm (magnetic head support part) 9a Lower end part 9b Upper end part 9c Hanging Part (extended part) 10 magnetic head 14 center of gravity 15 magnetic head unit 16 connecting part 18 magnetic head unit 19 magnetic head unit 20 magneto-optical disk 25 weight 30 recording / reproducing device 31 recording / reproducing device 32 recording / reproducing device

Claims (5)

[Claims] 1. A magnetic head unit comprising: a magnetic head for applying a magnetic field to a recording medium; and a magnetic head support having a connecting portion connected to a housing, wherein the connecting portion is on a vertical line of the center of gravity of the magnetic head unit. A magnetic head unit characterized by being formed so as to be located at a position. 2. The magnetic head unit according to claim 1, wherein the connecting portion is formed at the position of the center of gravity of the magnetic head unit. 3. The magnetic head supporting portion, wherein the connecting portion is positioned on a vertical line of the center of gravity of the magnetic head unit.
The magnetic head unit according to claim 1, further comprising an extension portion at a portion opposite to a portion supporting the magnetic head when viewed from the connection portion. 4. The magnetic head supporting portion is positioned such that the connecting portion is located on a vertical line of the center of gravity of the magnetic head unit.
2. A weight is provided at a portion opposite to a portion supporting the magnetic head as viewed from the connecting portion.
Or a magnetic head unit according to item 2. 5. A recording / reproducing apparatus comprising: the magnetic head unit according to claim 1; and a housing for fixing the magnetic head unit.