JPH0376080A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the airtightness of the inside and to improve the workability at the time of assembly work by placing a cover on the upper part of a base, and thereafter, sticking a band-like body for forming the inside of the base and the cover as an airtight chamber along the whole periphery of the outside peripheral part of a butt part of both of them. CONSTITUTION:To the upper part of a base in which each mechanism part of a spindle motor 12, a magnetic disk 13, a magnetic head 14, an arm 15, a voice coil motor 16, etc., is contained, a cover 17 for protecting these respective mechanism parts from dust, etc., is assembled through an airtight tape 19. That is, along the outside periphery of a fitting part 18 of a projecting edge part 11A formed along the peripheral edge of the upper face of a base 11 and a projecting edge part 17A formed along the peripheral edge of the lower face of the cover 17, an airtight tape 10 having stickiness is stuck so as to close up the fitting part 18. In such a way, the airtightness of the inside can be improved, and also, the workability for an assembly can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk device used as an external storage means of a computer, and in particular to improving the airtightness of the inside of a casing that houses a magnetic head, a magnetic disk, etc. The present invention relates to a magnetic disk device suitable for preventing off-track phenomena and improving workability during assembly work.

[Prior Art] A conventional magnetic disk device, as shown in FIG. 3, includes a magnetic disk, a magnetic disk drive motor, a magnetic head,
Mechanical parts such as a magnetic head drive motor (as shown) are housed inside a base 1, and a cover 2 is attached and fixed to the upper part of the base 1 with a plurality of screws 3. In this case, in order to maintain airtightness inside the casing constituted by the base 1 and cover 2, there is is provided with a seal 4 (see Figure 4).

[Problems to be Solved by the Invention] By the way, the above conventional magnetic disk device has the following problems.

■When assembling the base l and cover 2, they are fixed with screws, so as a result of the pressing force of the cover 2 acting on the base l during the assembling process, the seal 4 is attached to the base l and cover 2. In some cases, the cover may protrude from the joint between the base 1 and the cover 2, resulting in a problem in that the sealing performance of the attachment part between the base 1 and the cover 2 deteriorates, and the airtightness deteriorates.

■Also, since the base 1 is held down by the cover 2 when screws are tightened during assembly work, deformation such as 71J or distortion occurs in the base 1. As a result, when the magnetic head writes/reads data to/from the magnetic disk, the base 1 is deformed. There has been a problem in that an off-track phenomenon occurs in which the track of the magnetic disk and the magnetic head are misaligned.

Furthermore, since the assembly work of assembling the cover 2 to the base l is performed using a plurality of screws 3, there is a problem that the workability is very poor.

On the other hand, for example, a protrusion is provided along the periphery of the upper surface of the base of the magnetic disk drive, and a stepped portion shaped to engage with the protrusion of the base is provided along the periphery of the lower surface of the cover. An assembly method of assembling the base and the cover by engaging the protrusion and the stepped part, or a groove is provided along the protruding edge of the upper surface of the base and a groove is provided along the protruding edge of the lower surface of the cover. An assembly method may be considered in which the base and the cover are assembled by providing a protrusion that engages with the groove of the base and engaging the groove and the protrusion.
These assembly methods pose problems such as complicating the machining work of the protrusions and grooves when manufacturing the base and cover.

The present invention solves the above-mentioned problems, and improves the airtightness inside the casing and prevents deformation of the casing during assembly work, thereby preventing phenomena such as off-track. The purpose of this invention is to provide a magnetic disk device with improved performance.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a base in which a head disk assembly is housed, a cover placed over the top of the base, and a butting point between the base and the cover. It is characterized by consisting of a band-shaped body that is attached to the entire outer circumference of the body to make the inside an airtight chamber.

[Function] According to the present invention, when assembling the base and cover of a magnetic disk drive, the cover is placed over the top of the base, and then the abutting point is closed along the entire outer periphery of the abutting point between the two. In this way, a band-like member is attached to the base and cover to form an airtight chamber, and the two are fixed. Thereby, it is possible to improve the airtightness inside the magnetic disk device, improve workability during assembly, and prevent off-track phenomenon due to elimination of deformation of the base.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, reference numeral 10 denotes the magnetic disk device of this embodiment. A spindle motor 12 is fixed inside a base 11 of the magnetic disk device 10, and a recording medium is mounted on the hub of the spindle motor 12. A certain magnetic disk 13 is fixed. Then, the magnetic disk 13
is rotated by a spindle motor 12 at a predetermined rotation speed. Further, a magnetic head 14 is disposed inside the base 11, and the magnetic head 14 is disposed inside the base 11.
is supported by an arm 15 rotatably disposed on the base 11 via a pivot shaft 15A.

In addition, a voice coil motor (
A moving coil (path shown) fixed to the end of the arm 15 swings in an arc in a magnetic field generated in the gap of the voice coil motor 16. There is. That is, by driving the voice coil motor 16, the magnetic head 14 supported by the arm 15 is sought in the radial direction of the magnetic disk 13,
Alternatively, it may be held in place.

When writing/reading data to/from the magnetic disk 13, the magnetic head 14 floats due to the airflow generated on the disk surface as the magnetic disk 13 rotates, and writes/reads data to/from the target track of the magnetic disk 13. It is designed to read.

Further, the spindle motor 12. Magnetic disk 13.
Magnetic head 14. Arm 15. Voice coil motor 16
The upper part of the base 11 in which the mechanical parts such as
A cover 17 for protecting each of these mechanical parts from dust, etc.
are assembled via an airtight tape 19 which will be described later.

That is, as shown in FIG. 2, the projection 11A formed along the upper surface periphery of the base 11 of the magnetic disk drive 10 and the projection 17A formed along the lower surface periphery of the cover 17 are attached. An airtight tape 19 having adhesive properties is pasted along the outer periphery of the portion 18 so as to close the attachment portion 18 . Thereby, the base 11 and the cover 17 are fixed, and the airtightness inside the magnetic disk device 10 is maintained. In this case, the airtight tape 1 is attached to the mounting portion 18 between the base 11 and the cover 17 as described above.
9 is attached to maintain airtightness, the seal may be omitted or a seal may be provided between the mounting portions 18.

Next, the operation of this embodiment with the above configuration will be explained.

When assembling the magnetic disk device 110, the base 11
After positioning the projecting edge 11A on the periphery of the upper surface and the projecting edge 17A on the periphery of the lower surface of the cover 17, the outer periphery of the mounting section 18 is airtight so as to close the mounting section 18 between the base 11 and the cover 17. By pasting the tape 19, the inside of the magnetic disk drive is sealed. This results in
Since the airtightness inside the magnetic disk device 10 can be improved, it is possible to prevent dust from entering from the outside.

In addition, since the base and cover are not fixed by screws as in the conventional case, it is possible to prevent deformation such as warping or distortion of the base 11 during the assembly work of the base 11 and the cover 17, thereby off-track. This makes it possible to prevent such phenomena. Furthermore, since the assembly process is as simple as applying the airtight tape 18 to the outer periphery of the mounting portion 18, it is possible to mechanize the assembly process, thereby improving work efficiency.

[Effects of the Invention] As explained above, according to the present invention, the base in which the head disk assembly is housed, the cover placed over the top of the base, and the entire outer periphery of the abutment area between the base and the cover are provided. Since the structure is made up of a band-shaped body that is attached to the periphery and makes the inside an airtight chamber, the following effects can be achieved.

(2) It is possible to improve the airtightness of the inside of the casing that houses each mechanical part of the magnetic disk device, making it possible to prevent dust and the like from entering the inside of the casing from the outside.

(2) Also, since it is possible to prevent deformation of the base such as warping or distortion, which is conventional when assembling the base and cover, it is possible to prevent phenomena such as off-track.

(2) Furthermore, since it is possible to mechanize the assembly process of the base and cover, it is possible to improve workability during assembly.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view showing the configuration of a magnetic disk device according to an embodiment of the present invention, FIG. The figure is a plan view showing an example of how a cover is assembled to a base in a conventional magnetic disk device, and FIG. 4 is a partial sectional view showing an example in which the cover and base of a conventional magnetic disk device are sealed with a seal. 10...Magnetic disk device, 11...
Base, 11A... Projection, 13...
Magnetic disk, 14...Magnetic head, 17...
...Cover 17A...Protrusion, 18...
...Mounting part, 19...Airtight tape (band-shaped body).

Claims (1)

[Claims] Consisting of a base in which a head disk assembly is housed, a cover placed over the top of the base, and a band-like body affixed to the entire outer periphery of the abutment area between the base and the cover to form an airtight chamber inside. A magnetic disk device featuring: