JPH11328637A - Floppy disk apparatus and method for securing magnetic head of the floppy disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floppy disk apparatus in which a magnetic head and a magnetic recording medium can be kept in a penetration range in a heightwise direction easily even if each part is of a conventional precision and which can be improved in reliability and reduced in cost. SOLUTION: This floppy disk apparatus has a magnetic head 17 and a magnetic head mount plate 26 for fixing the magnetic head 17 to a carriage 13A. A gap is provided between the magnetic head mount plate 26 and the carriage 13A so that the contact face of the magnetic head 17 with a magnetic recording medium 1 has a predetermined size. A filler 28 is placed in the gap, thereby securely setting the magnetic head mount plate 26 to the carriage 13A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a floppy disk device of an external storage device used for a personal computer or the like, and a method of fixing a magnetic head in the floppy disk device.

[0002]

2. Description of the Related Art Conventionally, as a floppy disk drive of this kind, the magnetic head and the magnetic recording medium (media) are placed within a certain allowable range so that the magnetic head and the magnetic recording medium come into contact with each other. In some cases, recording or reproduction is performed while maintaining stability. This allowable range is usually called a penetration range and is determined by the shape of the magnetic head, the form of the magnetic recording medium, and the like.

[0003] In the inner track of the magnetic recording medium, the rigidity of the magnetic recording medium is higher than that of the outer track, so that the penetration range tends to be smaller. In particular, a 3.5-inch floppy disk has a metal core on the inner periphery, so that the penetration range is further reduced. For this purpose, the penetration range is set by increasing the accuracy of each component.

In a conventional floppy disk drive of this type, a height adjustment is made between a guide rod for determining the height dimension of the magnetic head and a guide rod receiving surface provided on the base plate. A thin plate was inserted and adjusted so as to be within the penetration range.

[0005]

However, in the conventional floppy disk drive, it is necessary to increase the dimensional accuracy of each component in order to put the magnetic head and the magnetic recording medium in the penetration range, and the cost is reduced. Will be higher. Further, when a thin plate is inserted between the guide rod and the guide rod receiving surface, workability is extremely poor, and there is a problem that the penetrating range cannot be maintained due to an incorrectly inserted thin plate.

The present invention solves such a conventional problem. A first object of the present invention is to reduce the height of a magnetic head and a magnetic recording medium even if each component has a conventional accuracy. It is an object of the present invention to provide a floppy disk drive capable of easily entering a direction into a penetration range, improving reliability and reducing costs.

It is a second object of the present invention to provide a method of fixing a magnetic head in a floppy disk drive capable of fixing a magnetic head to a carriage with required accuracy.

[0008]

In order to achieve the first object, a floppy disk drive according to the present invention comprises:
A floppy disk drive comprising a magnetic head and a magnetic head mounting plate for fixing the magnetic head to a carriage, the floppy disk device being adhesively fixed to the carriage, wherein a contact surface of the magnetic head with a magnetic recording medium has a predetermined size. A gap is provided between the magnetic head mounting plate and the carriage so that the gap is filled with a filler and the magnetic head mounting plate is fixed to the carriage.

With this configuration, a gap is provided between the magnetic head mounting plate and the carriage, which is larger than the sum of the tolerances of the components, and the height and flatness (inclination) of the contact surface of the magnetic head and the carriage are adjusted. In this state, the gap is filled with a filler to fix the magnetic head and the carriage, so that the contact surface of the magnetic head and the height and flatness (inclination) of the carriage can be matched. The magnetic recording medium can be put in the required penetration range. As a result, a highly reliable floppy disk drive can be realized.

According to another aspect of the present invention, there is provided a method of fixing a magnetic head in a floppy disk drive, comprising the steps of: providing a magnetic head and a magnetic head mounting plate for fixing the magnetic head to a carriage; A method for fixing a magnetic head to a carriage via the magnetic head mounting plate, wherein the magnetic head is set in advance so that a contact surface of the magnetic head with a magnetic recording medium has a predetermined size. And a gap is provided between the magnetic head mounting plate and the carriage, and after the gap has a predetermined size including the precision of components such as the magnetic head mounting plate, the carriage, and the magnetic head. The gap is filled with a filler to fix the magnetic head mounting plate to the carriage.

Therefore, a gap is provided between the magnetic head mounting plate and the carriage, which is larger than the sum of the tolerances of the components, and the height and flatness (inclination) of the contact surface of the magnetic head and the carriage are matched. By filling the gap with the filler, the magnetic head and the carriage can be fixed, and an inexpensive and highly accurate method of fixing the magnetic head to the carriage can be realized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A floppy disk drive according to the present invention will be described below with reference to the drawings.

According to a first aspect of the present invention, there is provided a floppy disk drive which includes a magnetic head and a magnetic head mounting plate for fixing the magnetic head to a carriage, and is adhered and fixed to the carriage. hand,
A gap is provided between the magnetic head mounting plate and the carriage so that the contact surface of the magnetic head with the magnetic recording medium has a predetermined dimension, and the gap is filled with a filler to fix the magnetic head mounting plate to the carriage. It is characterized by the following.

With this configuration, a gap is provided between the magnetic head mounting plate and the carriage, which is larger than the sum of the tolerances of the components, and the height and flatness (inclination) of the contact surface of the magnetic head and the carriage are adjusted. In this state, the magnetic head and the carriage can be fixed by filling the gap with a filler, and the height and flatness (inclination) of the contact surface of the magnetic head and the carriage can be matched. The head and the magnetic recording medium can be put in a required penetration range. As a result, a highly reliable floppy disk drive can be realized.

According to a second aspect of the present invention, there is provided a floppy disk drive according to the first aspect, wherein the filler is an adhesive mainly composed of an ultraviolet curable resin.

With this configuration, the same operation and effect as those of the first aspect of the present invention can be achieved, or a treatment such as heating is not required, and the occurrence of thermal deformation can be suppressed, and ultraviolet irradiation can be performed. Can be fixed in a shorter time. Further, the coefficient of thermal expansion of the resin is set to 2.0 × 10 ^−5.
By using a material having a temperature of / ° C. or less, a change in heat can be suppressed and the reliability can be improved.

According to a third aspect of the present invention, there is provided a floppy disk drive according to the first aspect, wherein a predetermined dimension is set to a distance between the contact surface of the magnetic head with the magnetic recording medium and the carriage in the track direction. It is determined by the moving guide part.

With this configuration, the same operation and effect as the above-described first embodiment can be obtained.

According to a fourth aspect of the present invention, there is provided a floppy disk drive according to the first aspect, wherein the magnetic head mounting plate is formed by pressing or etching a non-magnetic type metal flat plate. Created.

With this configuration, not only the same effects as those of the first aspect of the present invention can be achieved, but also the use of a non-magnetic metal for the magnetic head mounting plate suppresses electromagnetic noise circulating around the magnetic head. At the same time, the influence of magnetism on the magnetic head itself can be suppressed.

According to a fifth aspect of the present invention, in the floppy disk device according to the first aspect, the magnetic head mounting plate and the carriage have rigidity higher than the rigidity of the magnetic recording medium.

According to this configuration, not only the same operation and effect as the above-described first embodiment can be obtained, but also the magnetic head mounting plate and the carriage are configured to have high rigidity with respect to the magnetic recording medium. In addition, the height and the inclination can be stably maintained with respect to the fluctuation of the magnetic recording medium.

According to a sixth aspect of the present invention, there is provided a method for fixing a magnetic head in a floppy disk drive, comprising: a magnetic head; and a magnetic head mounting plate for fixing the magnetic head to a carriage. A method of fixing a magnetic head to a carriage through a magnetic head, comprising: positioning a contact surface of a magnetic head with a magnetic recording medium at a predetermined position so as to have a predetermined size; A gap is provided between the head mounting plate and the carriage, and after the gap has a predetermined size including the precision of components such as the magnetic head mounting plate, the carriage and the magnetic head, the gap is filled with a filler. The magnetic head mounting plate is fixed to the carriage.

Therefore, an inexpensive and highly accurate method of fixing the magnetic head to the carriage can be realized.

According to a seventh aspect of the present invention, there is provided a method of fixing a magnetic head to a floppy disk drive according to the sixth aspect of the present invention, wherein the filler mainly comprises an ultraviolet curable resin. An adhesive as a component.

Therefore, not only the same operation and effect as the above-mentioned sixth embodiment can be obtained, but also a treatment such as heating is not required, and the occurrence of thermal deformation can be suppressed. Can be fixed. Furthermore, by using a resin having a coefficient of thermal expansion of 2.0 × 10 ⁻⁵ / ° C. or less, it is possible to suppress a thermal change and improve reliability.

According to a eighth aspect of the present invention, there is provided a method of fixing a magnetic head to a floppy disk drive according to the sixth aspect of the present invention, wherein the magnetic head has a contact surface with a magnetic recording medium. Is positioned in close contact with a reference plane whose height and flatness with respect to the carriage are fixed.

Therefore, not only the same effects as those of the above-described claim 6 can be obtained, but also, for example,
By using a jig for bringing the head surface into close contact with the reference surface with respect to the guide portion of the carriage, necessary accuracy can be given to the finally required portion, so that the work becomes easier and the workability can be improved. As a result, a highly reliable method of fixing the magnetic head, such as a modification, can be obtained.

Next, an embodiment of a floppy disk drive according to the present invention will be described. FIG. 1 is an exploded perspective view of a floppy disk drive according to the present invention, FIG. 2 is a plan view of a carriage assembly in the floppy disk drive according to the present invention, and FIG. 3 is a view from the X direction in FIG. FIG. 4 is a view from the direction of the arrow Y in FIG. 2, and FIG. 5 is a perspective view of the magnetic recording medium.

The magnetic recording medium 1 is constructed by attaching a metal core (metal center core) 3 to the center of a recording medium main body 2. The recording medium main body 2 has a magnetic layer on both sides of a PET film of about 70 μm. The core metal (metal center core) 3 is usually made of magnetic stainless steel. In the center of the metal core (metal center core) 3, a positioning hole 4 and a rotation driving hole 5 are provided.

As shown in FIG. 1, the floppy disk drive comprises a base plate 11, a spindle motor 12,
It comprises a carriage assembly 13 and the like. The base plate 11 is a portion serving as a base for supporting each necessary component.

The carriage assembly 13 is provided with a carriage 13A as shown in FIGS. 2 to 4. The base of the arm 13 is provided at the base of the carriage 13A in the vertical direction by using a thin plate spring 15 called a roll pivot. It is pivotally connected.

The distal end of the carriage 13A and the distal end of the arm 14 face the upper and lower magnetic heads 1 facing each other.
6 and 17 are provided. That is, the lower magnetic head 1
Numeral 7 is fixed to the carriage 13A via a rigid plate 26 and a filler.
Is fixed to the arm 14 by a gimbal spring (not shown) so as to be rotatable in the rolling and pitching directions.

The arm 14 and the upper magnetic head 16 are urged by the load spring 18 toward the carriage 13A and the lower magnetic head 17, and the upper and lower magnetic heads 16 and 17 are moved.
Thus, reading and writing can be performed with the magnetic recording medium 1 interposed therebetween.

The carriage 13A is mounted on the lower surface of the base plate 11 via a guide portion 30 so as to be movable in the radial direction of the magnetic recording medium 1.

That is, the guide section 30 is
3A is provided with a bearing holder 21 formed on the lower surface,
In the bearing holder 21, an outer bearing 22B located on the outer peripheral side of the magnetic recording medium 1 and an inner bearing 22A located on the inner peripheral side of the magnetic recording medium 1 are provided. Are provided on the base plate 11 by slidably fitting the inner and outer bearings 22A and 22B on the guide rod 23.

Further, a step motor 19 is attached to the base plate 11, and the step motor 1
9, a follower 20A provided at a portion of the carriage 13 where the lead screw 20 is engaged responds to the carriage assembly 13, that is, the upper and lower magnetic heads. The reference numerals 16 and 17 are moved in the track direction of the magnetic recording medium 1 supported by the spindle motor 12.

Next, the height relationship between the upper and lower magnetic heads 16 and 17 and the magnetic recording medium 1 will be described. In FIG.
The spindle shaft 24 corresponds to the positioning hole 4 of the metal core 3 of the magnetic recording medium 1, and the driving pin (not shown) similarly corresponds to the rotation driving hole 5 of FIG. Made in.

The difference between the contact surfaces of the upper and lower magnetic heads 16 and 17 and the center of the thickness of the magnetic recording medium 1 determined by the core 3 held in contact with the sheet 31 is the penetration L.
It is a value called _p . That is, the penetration L
_p indicates the dimensional difference between the center of the thickness of the magnetic recording medium 1 and the contact surfaces of the upper and lower magnetic heads 16 and 17.

FIGS. 7 (a) and 7 (b) and FIGS.
(B) is penetrator - shows the and Deployment - retardation value L _p and the upper, and the average value of the output amplitude of the read output from the lower magnetic head 16 and 17, appearing Mojire the envelope of the output waveform is there.

The output amplitude and the modulation are determined by the floppy
The disk drive (FDD) serves as an index for determining the occurrence of an error, and is required to have a high output and a low modulation. In the embodiment of the present invention, ± 0.1
It is 5 mm, which is a value necessary to ensure the reliability of the floppy disk drive.

The carriage 1 of the magnetic carriage assembly 13
3A is a resin molded product having a precision of about ± 50 μm. The magnetic head mounting plate 26 is formed by etching or pressing a 0.2 mm plate material. Therefore, although the tolerance of the plate material is about ± 20 μm, the precision of the parallelism between the magnetic head 17 and the magnetic head mounting plate 26 becomes ± 50 μm because the magnetic head 17 is adhered to this. Therefore, when the magnetic head 17 and the magnetic head mounting plate 26 are bonded and fixed to the carriage 13A, a variation of about ± 0.1 mm occurs.

Therefore, as shown in FIGS. 9 to 11, a predetermined size including the precision of the components such as the magnetic head mounting plate 26, the carriage 13A and the magnetic head 17 is previously provided between the carriage 13A and the magnetic head mounting plate 26. Gap 2
7 is provided, the magnetic head 17 is pressed against the reference plane P, the height is determined, and then the gap 27 is filled with a filler 28 such as resin to fix the magnetic head 17 to the carriage 13A. In addition, the above-described variation is suppressed, and the accuracy is improved.

The magnetic head mounting plate 26 is formed by pressing or etching a non-magnetic flat plate made of metal such as stainless steel or beryllium copper, and the filler 28 is mainly composed of an ultraviolet curable resin. Use an adhesive. According to this, it is possible to prevent a decrease in workability due to heating or the like and a decrease in accuracy due to thermal deformation. Furthermore, by using a resin having a coefficient of thermal expansion of 2.0 × 10 ⁻⁵ / ° C. or less, it is possible to suppress a thermal change and improve reliability.

The rigidity of the magnetic head mounting plate 26 and the carriage 13 A is higher than the rigidity of the magnetic recording medium 1. The predetermined size is determined by the contact surface 17a of the magnetic head 17 with the magnetic recording medium 1 and the guide portion 30 that moves the carriage 13A in the track direction. Further, the magnetic head 17 is positioned by bringing the contact surface 17a of the magnetic head 17 into close contact with a reference surface P whose height and flatness are fixed to the carriage 13A (see FIG. 11).

[0046]

As described above, according to the floppy disk drive of the present invention, a gap is provided between the magnetic head mounting plate and the carriage, which is larger than the sum of the respective tolerances of the components, and the magnetic head has The magnetic head and the carriage are fixed by filling the gap with a filler in a state where the height and the flatness (inclination) of the contact surface and the carriage are matched, and the height of the contact surface of the magnetic head and the height of the carriage are fixed. And the flatness (inclination) can be matched, and the magnetic head and the magnetic recording medium can be put in a required penetration range. As a result, a highly reliable floppy disk drive can be realized.

Further, by using an adhesive mainly composed of an ultraviolet-curable resin as a filler to be filled, a treatment such as heating is not required, and the occurrence of thermal deformation can be suppressed. It can be fixed in time.
Furthermore, by using a resin having a coefficient of thermal expansion of 2.0 × 10 ⁻⁵ / ° C. or less, it is possible to suppress a thermal change and improve reliability.

Further, by forming the magnetic head mounting plate and the carriage with high rigidity with respect to the magnetic recording medium, the height and the inclination can be stably maintained against the fluctuation of the magnetic recording medium.

Further, by using a non-magnetic metal for the magnetic head mounting plate, it is possible to suppress electromagnetic noise circulating around the magnetic head and to suppress the influence of magnetism on the magnetic head itself.

According to the method of fixing a magnetic head in a floppy disk drive according to the present invention, an inexpensive and highly accurate method of fixing a magnetic head to a carriage can be realized.

Further, for example, by using a jig for bringing the head surface into close contact with the reference surface with respect to the guide portion of the carriage, necessary accuracy can be given to the finally required portion, so that the work becomes easy and the workability is improved. Can also be improved. As a result, a highly reliable method of fixing the magnetic head, such as a modification, can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a floppy disk drive according to the present invention.

FIG. 2 is a plan view of a carriage assembly in the floppy disk drive according to the present invention.

FIG. 3 is an arrow view from the X direction in FIG. 2;

FIG. 4 is an arrow view from the Y direction in FIG. 2;

FIG. 5 is a perspective view of a magnetic recording medium.

FIG. 6 is a sectional view of a main part showing a height relationship between a magnetic head and a magnetic recording medium.

FIG. 7 is a penetrator in the floppy disk drive.
Characteristic diagram showing the range of application

FIG. 8: Penetration in the floppy disk drive
Characteristic diagram showing the range of application

FIG. 9 is an explanatory view of a state where a gap is provided between the carriage and the magnetic head mounting plate in the floppy disk device.

FIG. 10 is an explanatory view showing a state in which a filler is filled in a gap between a carriage and a magnetic head mounting plate in the floppy disk device.

FIG. 11 is an explanatory view showing a state in which a gap between the carriage and the magnetic head mounting plate is filled with a filler and the upper magnetic head is in contact with a reference surface in the floppy disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic recording medium 3 Core 4 Positioning hole 5 Rotation driving hole 11 Base plate 12 Spindle motor 13 Carriage assembly 13A Carriage 14 Arm 16 Upper magnetic head 17 Lower magnetic head 17a Contact surface 22A Inner bearing 22B Outer bearing 23 Guide rod 26 Magnetic head mounting plate 27 Clearance 28 Filler

Claims (8)

[Claims] 1. A floppy disk drive comprising a magnetic head and a magnetic head mounting plate for fixing the magnetic head to a carriage, wherein the floppy disk device is adhered and fixed to the carriage, wherein the magnetic head contacts a magnetic recording medium. A gap is provided between the magnetic head mounting plate and the carriage so that the surface has a predetermined dimension, and the gap is filled with a filler to fix the magnetic head mounting plate to the carriage. Disk device. 2. The floppy disk drive according to claim 1, wherein the filler is an adhesive mainly composed of an ultraviolet curable resin. 3. The floppy disk drive according to claim 1, wherein the predetermined size is determined by a contact surface of the magnetic head with the magnetic recording medium and a guide portion for moving the carriage in the track direction. 4. The floppy disk drive according to claim 1, wherein the magnetic head mounting plate is formed by pressing or etching a nonmagnetic metal flat plate. 5. The magnetic head mounting plate and the carriage,
2. The floppy disk drive according to claim 1, wherein the floppy disk drive has higher rigidity than the magnetic recording medium. 6. A method for fixing a magnetic head in a floppy disk drive, comprising a magnetic head and a magnetic head mounting plate for fixing the magnetic head to a carriage, and fixing the magnetic head to the carriage via the magnetic head mounting plate. The contact surface of the magnetic head with the magnetic recording medium is positioned at a predetermined position so as to have a predetermined size, and a gap is provided between the magnetic head mounting plate and the carriage. A floppy disk having a predetermined size including the precision of components such as a head mounting plate, a carriage and a magnetic head, and then filling the gap with a filler to fix the magnetic head mounting plate to the carriage. -A method for fixing a magnetic head for a disk drive. 7. The method of fixing a magnetic head in a floppy disk drive according to claim 6, wherein the filler is an adhesive mainly composed of an ultraviolet curable resin. 8. The positioning of the magnetic head by bringing the contact surface of the magnetic head into contact with the magnetic recording medium in close contact with a reference surface having a fixed height and flatness with the carriage.
3. The method of fixing a magnetic head in a floppy disk drive according to claim 1.