JP2002260323A - Magnetic head carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve noise-proof characteristics and shock resistance. SOLUTION: A lower side magnetic head 11 which performs recording- reproducing with respect to the undersurface of a magnetic disk, and an upper side magnetic head 14 which performs reading-reproducing with respect to the upper surface of the magnetic disk are supported by a lower carriage 13 and an upper carriage 16, respectively. A first to third notched parts 30, 31, and 32 are formed on the upper side shielding case 21b of the upper side magnetic head 14. The volume of the upper side shielding case 21b is made smaller than the volume of the lower side shielding case 21a of the lower side magnetic head 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetic head carriage mounted on a magnetic disk drive used as an external recording device such as a computer, and more particularly to a magnetic head carriage capable of improving impact resistance.

[0002]

2. Description of the Related Art Conventionally, a magnetic head carriage is mounted on a magnetic disk device for recording and reproducing magnetic signals on a magnetic disk such as a floppy disk (floppy (registered trademark) disk).

As shown in FIG. 6, a conventional magnetic head carriage 100 includes a lower carriage 103 on which a lower magnetic head 101 for performing recording and reproduction on a lower surface side of a magnetic disk is mounted via a lower gimbal 102. An upper magnetic head 104 for performing recording and reproduction on the upper surface side of the magnetic disk; and an upper carriage 106 mounted via an upper gimbal 105. The lower carriage 103 and the upper carriage 106 are respectively connected to the lower magnetic head. The connection is made at the end opposite to the end where the 101 and the upper magnetic head 104 are attached.

As shown in FIGS. 7 and 8, the lower magnetic head 101 and the upper magnetic head 104 have a lower slider 110a and a lower shield case 1, respectively.
11a, an upper slider 110b and an upper shield case 111b. FIG. 7 is a front view of the lower magnetic head 101 and the upper magnetic head 104 viewed from the direction of the arrow shown in FIG. 6, and FIG. 8 is a front view of the lower magnetic head 101 and the upper magnetic head 104 of the direction of the arrow shown in FIG. FIG. 3 is a side view of the magnetic head 104.

The lower slider 110a and the upper slider 110b are respectively provided with a magnetic head core 112 and a magnetic head core 112 formed of a magnetic material joined through a magnetic gap (not shown) formed of a non-magnetic material.
The sliding contact portion is integrated so as to be sandwiched between a pair of non-magnetic members 113 from both sides.

The magnetic head core 112 applies a magnetic field modulated according to an information signal to be recorded on the magnetic disk by a coil (not shown), thereby generating a leakage magnetic flux from a magnetic gap (not shown). Recording is performed by applying a magnetic domain to the magnetic layer to form a magnetic domain. At the time of reproduction, a magnetic field from a magnetic domain formed on the magnetic disk is taken into the magnetic head core 112 by a magnetic gap and detected by a coil.

The lower shield case 111a and the upper shield case 111b are formed of a magnetic material.
It has a function of shielding a coil disposed around the zero. In the following, the lower shield case 111
a and the upper shield case 111b are collectively referred to simply as a shield case 111.

[0008]

In the conventional magnetic head carriage 100, the lower magnetic head 1 is used from the viewpoint of reducing the cost by using common components.
01 and the upper magnetic head 104 are shared. Therefore, each component of the lower magnetic head 101 and the upper magnetic head 104 is formed in the same shape, including the magnetic head core 110 and the shield case 111.

Here, the outer shape of the shield case 111 has a great influence on the noise resistance of the lower magnetic head 101 and the upper magnetic head 104. Generally, the larger the volume, the better the noise resistance. However, when the volume of the shield case 111 is increased, the weight of the lower magnetic head 101 and the upper magnetic head 104 increases, and there is a problem that the shock resistance of the magnetic disk device is deteriorated.

More specifically, when the volume of the shield case 111 is increased, when an external impact is applied to the magnetic disk device, the lower magnetic head 101 and the upper magnetic head 104 largely move due to the influence of inertia. The collision with the magnetic disk causes a problem that the lower magnetic head 101 and the upper magnetic head 104, the magnetic disk, and data recorded on the magnetic disk are damaged.

[0011] This problem is particularly caused by a thinned floppy disk drive (1/2 "h), which has recently attracted attention.
Also called FDD or half-height FDD. ). This is because the thinning of the magnetic disk device makes it difficult to mount a mechanism for absorbing an impact, and the impact applied to the device is directly applied to a magnetic head or the like.

Conversely, if the volume of the shield case 111 is reduced in order to improve the shock resistance, the noise resistance of the lower magnetic head 101 and the upper magnetic head 104 is remarkably deteriorated, resulting in good recording. There is a problem that it is difficult to obtain reproduction characteristics.

Accordingly, the present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a magnetic head carriage having an excellent balance between noise resistance and impact resistance.

[0014]

As a result of the inventor's intensive studies to achieve the above object, the problem that occurs when an impact is applied to the device is that the upper magnetic head collides with the lower magnetic head. Has led to the finding that doing so has a significant effect. Accordingly, the present invention is proposed based on the idea that it is possible to prevent the deterioration of the shock resistance characteristics by reducing the shock when the upper magnetic head collides with the lower magnetic head. .

That is, a magnetic head carriage according to the present invention comprises a lower carriage on which a lower magnetic head for performing recording and reproduction with respect to a lower surface of a magnetic disk is mounted via a lower gimbal, and an upper surface of the magnetic disk. An upper magnetic head having an upper magnetic head that performs recording and reproduction with respect to an upper carriage mounted via an upper gimbal, wherein the upper magnetic head and the lower magnetic head each include a pair of magnetic heads via a magnetic gap. A magnetic head core having a magnetic member joined thereto, a coil disposed around the magnetic head core, a slider joined to a disk sliding contact portion of the magnetic core, and a magnetic shield for the magnetic head core and the coil And a shield case for the upper magnetic head, Volume than the shield case of the air head is characterized in that it is small.

In the magnetic head carriage according to the present invention constructed as described above, since the shield case of the upper magnetic head is smaller in volume than the shield case of the lower magnetic head, it is possible to receive an external impact. In addition, the impact when the upper magnetic head collides with the lower magnetic head can be reduced. In addition, by forming the shield case of the lower magnetic head with a volume sufficient to compensate for the reduction in volume of the shield case of the upper magnetic head, it is possible to easily prevent deterioration of the noise resistance characteristics.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. Hereinafter, a magnetic head carriage 10 as shown in FIG. 1 will be described as one configuration example of the present invention.

As shown in FIG. 1, the magnetic head carriage 10 includes a lower carriage 13 to which a lower magnetic head 11 for performing recording and reproduction on the lower surface side of the magnetic disk is mounted via a lower gimbal 12, and a magnetic disk. An upper carriage 16 on which an upper magnetic head 14 for performing recording and reproduction with respect to the upper surface side of the
The lower carriage 13 and the upper carriage 16 are connected at the end opposite to the end where the lower magnetic head 11 and the upper magnetic head 14 are attached.

As shown in FIGS. 2 to 5, the lower magnetic head 11 and the upper magnetic head 14 have a lower slider 20a and a lower shield case 21a, respectively.
An upper slider 20b and an upper shield case 21b are provided. FIG. 2 is a front view of the lower magnetic head 11 and the upper magnetic head 14 as viewed from the direction of the arrow shown in FIG. 1, and FIG. 3 is a front view of the lower magnetic head 11 and the upper magnetic head 14 as viewed from the direction of the arrow shown in FIG. FIG. 3 is a side view of the magnetic head 14. FIG. 4 is a plan view of the lower magnetic head 11 as viewed from the surface facing the magnetic disk, and FIG. 5 is a plan view of the upper magnetic head 14 as viewed from the surface facing the magnetic disk.

Note that the lower magnetic head 11 has a "Side 0"
The upper magnetic head 14 may also be referred to as a side magnetic head or a lower magnetic head, and “Side 1” of the upper magnetic head 14 may also be referred to as a washiki head or an upper magnetic head.

The lower slider 20a and the upper slider 20b have a magnetic head core 22 made of a magnetic material (for example, ferrite) joined through a magnetic gap (not shown) formed of a nonmagnetic material, and a magnetic head core 2
2 is a pair of non-magnetic members 1 such as ceramics.
13 are integrated so as to be sandwiched from both sides.

The magnetic head core 22 is applied with a magnetic field that modulates according to an information signal to be recorded on the magnetic disk by a coil (not shown) to generate a magnetic flux leakage from a magnetic gap (not shown). Recording is performed by applying a magnetic domain to the magnetic layer to form a magnetic domain. At the time of reproduction, a magnetic field from a magnetic domain formed on the magnetic disk is taken into the magnetic head core 22 by a magnetic gap and detected by a coil.

The lower shield case 21a and the upper shield case 21b are made of a magnetic material such as permalloy or ferrite.
2 and a coil disposed around the magnetic head core 22. In the following, the lower shield case 21a and the upper shield case 21b are collectively referred to simply as the shield case 21.

In the magnetic head carriage 10, as shown in FIGS. 2 to 5, the shape of the lower shield case 21a is different from the shape of the upper shield case 21b. That is, the upper shield case 21b is formed with first and second cutouts 30 and 31 indicated by dotted lines in the front view of FIG. 2 and third cutouts 32 indicated by dotted lines in the side view of FIG. Accordingly, the volume is smaller than that of the lower shield case 21a. Therefore, the weight of the upper magnetic head 14 is smaller than that of the lower magnetic head 11.

For this reason, even when the magnetic head carriage 10 is mounted on the magnetic disk device and an impact is applied to the device, the upper magnetic head 14 collides with the lower magnetic head 11 when the magnetic head carriage 10 is mounted on the magnetic disk device. Can be reduced, and the impact resistance can be improved as compared with the magnetic head carriage 100 having the conventional structure.

Further, in the magnetic head carriage 10, by forming the lower shield case 21a with a volume sufficient to compensate for the reduced volume of the upper shield case 21b, it is possible to easily prevent deterioration of the noise resistance characteristics. it can.

Therefore, the magnetic head carriage 10
Is excellent in balance between noise resistance and impact resistance.

[0028]

According to the magnetic head carriage of the present invention,
Because the shield case of the upper magnetic head is smaller in volume than the shield case of the lower magnetic head,
It is possible to reduce the impact when the upper magnetic head collides with the lower magnetic head due to an external impact. Further, by forming the shield case in the lower magnetic head with a volume sufficient to compensate for the reduction in the volume of the shield case in the upper magnetic head, it is possible to easily prevent deterioration of the noise resistance.

Therefore, the magnetic head carriage according to the present invention has an excellent balance between noise resistance and impact resistance, and in particular, a thin floppy disk drive (1/1).
2 "hFDD, half-height FDD).

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a magnetic head carriage shown as one configuration example to which the present invention is applied.

FIG. 2 is a front view schematically showing a lower magnetic head and an upper magnetic head provided in the magnetic head carriage.

FIG. 3 is a side view schematically showing a lower magnetic head and an upper magnetic head provided in the magnetic head carriage.

FIG. 4 is a plan view schematically showing a lower magnetic head provided in the magnetic head carriage.

FIG. 5 is a plan view schematically showing an upper magnetic head provided in the magnetic head carriage.

FIG. 6 is a schematic diagram showing a configuration of a conventional magnetic head carriage.

FIG. 7 is a front view schematically showing a lower magnetic head and an upper magnetic head provided in a conventional magnetic head carriage.

FIG. 8 is a side view schematically showing a lower magnetic head and an upper magnetic head provided in a conventional magnetic head carriage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Magnetic head carriage 11 Lower magnetic head 14 Upper magnetic head 20a Lower slider 20b Upper slider 21a Lower shield case 21b Upper shield case 30 1st notch 31 2nd notch 32 3rd notch

Claims (1)

[Claims] 1. A lower carriage having a lower magnetic head for performing recording and reproduction on a lower surface of a magnetic disk via a lower gimbal, and an upper magnetic for recording and reproducing on an upper surface of the magnetic disk. A magnetic head carriage comprising: an upper carriage to which a head is attached via an upper gimbal; wherein the upper magnetic head and the lower magnetic head are each formed by joining a pair of magnetic members via a magnetic gap. And a coil disposed around the magnetic head core, a slider joined to a disk sliding portion of the magnetic core, and a shield case for magnetically shielding the magnetic head core and the coil. The shield case of the head is smaller in volume than the shield case of the lower magnetic head. The magnetic head carriage, characterized in that are.