JPH03200564A - Seal structure of sealed vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a sealing structure for a sealed container, particularly a sealing structure that easily seals an opening communicating with outside air provided in a sealed container housing an electronic equipment assembly such as a magnetic head/disk assembly. The opening provided in a part of the sealed container is sealed by pasting a sealing sheet that does not generate impurity gas inside the opening and has increased strength against the pressure difference between the internal pressure of the sealed container and the outside air. A seal structure that seals an opening that communicates with the outside air provided in an airtight container housing an electronic device assembly, with the aim of making it easier to make the airtight container smaller and thinner, and which has a larger area than the opening. and a backing sheet attached to the center of the adhesive surface of the adhesive sheet and having an area smaller than the adhesive surface and larger than the opening. The structure is such that it covers the entire area of the opening and is pasted in an overlapping manner around the opening to seal it.

[Industrial application field]

The present invention relates to a seal structure for a closed container, and more particularly to a seal structure for easily sealing an opening communicating with the outside air provided in a closed container housing an electronic device assembly such as a magnetic head/disk assembly.

In recent years, with the increase in recording density in magnetic disk drives, the flying gap of the magnetic head during recording and playback on the magnetic disk has tended to become smaller and smaller. magnetic head,
Alternatively, problems arise in that the magnetic disk surface is damaged and recorded information is destroyed. For this reason, a head-disk assembly (HDA) structure is generally employed in which the spindle, magnetic disk, magnetic head, head positioning mechanism, etc. are housed in one dust-proof airtight container to improve reliability.

There are two types of HDA structures in which such an HDA is housed in a sealed container: an outside air introduction method that actively introduces clean air from the outside, and a sealed method that blocks the inflow of outside air and is advantageous for downsizing. A closed container is usually used to adjust the drive of the head positioning mechanism when writing servo information to a part of the magnetic disk after housing the HD A, or to insert a magnetic head from the outside into the container to write part of the magnetic disk. HDDs are provided with an opening for writing clock information, etc., and are sealed using a backing etc. after use.
In structure A, the sealing structure of the opening in the closed container is also required to have a simple structure that can be made compact.

[Prior art] HDA that is advantageous for miniaturization by housing HDA in a conventional closed container
The A structure and the sealing structure of the opening are as shown in FIG. The spindle 3 is rotatably supported, and a spindle hub 6 on which a plurality of magnetic disks 5 are concentrically attached is attached to the spindle 3.

Further, in a head positioning mechanism 8 for positioning the magnetic head 7 with respect to these magnetic disks 5, a rotating shaft 1o connected to a drive motor 9 is rotatably supported on a supporting portion of the base body 1a via bearings l1ii and Ilb. 2. Near the bearings llb, 2a, 2b that support the rotating shaft 1o and the spindle 3, outside air enters and the bearings llb, 2a, 2b,
A fluid seal 12 is provided to prevent the lubricating grease from scattering from the lubricating grease 2b.

Further, the integrated cover lb forming a part of the sealed field 11 is provided with drive adjustment of the head positioning mechanism 8 when writing servo information on a part of the magnetic disk 5, for example, after the head disk assembly (HDA) is sealed. Alternatively, insert the magnetic head into the airtight container 1 from the outside and insert the magnetic disk 5 into the closed container 1.
The opening 13 is used to write clock information in a part of the
．． 14, and after the above-mentioned necessary operation adjustment, a sealing plate 16 is fixed to the opening 13, 14 with screws 17 via a banking J5 such as an O-ring, thereby sealing the opening 13.14.

[Problem to be solved by the invention]

By the way, as for the sealing structure of the openings 13 and 14 provided in the integrated cover lb that constitutes a part of the conventional airtight container 1 described above, the reliability of sealing is high by using a backing 15 such as an O-ring. On the other hand, backing 1
Due to the structure of the stepped opening in which the sealing Fi 16 is fixed with the screw 17 through the opening 5, it becomes difficult to reduce the thickness of the cover 1b of the sealed container 1 as the device becomes smaller. It is also necessary to apply a sealant or adhesive to the threaded hole that passes through the cover unit lb that is secured with the screw 17 to maintain airtightness.
There is a problem in that such sealing work becomes complicated.

Therefore, in order to solve such a problem, Fig. 5(a)
As shown in the plan view and the cross-sectional view of main parts in Part 5, for example, a base tape 22 made of synthetic paper and a pressure-sensitive material such as acrylic resin is applied onto the opening 13 provided in the integrated cover lb. A relatively simple method has been proposed in which a seal tape 21 having an area larger than the opening 13 coated with the adhesive M23 is applied to seal the opening.

This sealing tape 21 is extremely thin and easy to handle, so it can be used with the cover integrated with the lb.
This is extremely advantageous for making the device thinner.

However, a part of the adhesive surface 23 of the pasted seal tape 21 is exposed in the opening 13, and there is a risk that the HD A in the closed container l may be contaminated by volatile components, that is, impure gas, generated from the exposed adhesive surface 23a. was there.

In order to prevent the generation of impurity gas from the exposed adhesive surface 23a, as shown in the plan view of FIG. 6(a) and the sectional view of the main part of FIG. 6(b), a The base tape 32 made of, for example, synthetic paper has an adhesive surface 33a on which a pressure-sensitive adhesive layer 33 is applied on a surface other than the area corresponding to the opening 13, and the opening It has also been attempted to seal a sealing tape 31 with a wider area than 13 on the opening 13, but in this case, the non-adhesive area 32a of the sealing tape 31 corresponding to the opening 13 is The closed container 1 tends to be deformed due to the difference between the internal pressure and the external pressure, and has the disadvantage of being weak in strength.

In view of the above-mentioned conventional problems, the present invention prevents the generation of impurity gas into the opening provided in a part of the closed container, and also prevents the generation of impurity gas into the opening provided in a part of the closed container. The object of the present invention is to provide a new sealed container sealing structure that can be easily made smaller and thinner by pasting and sealing a sealing sheet with increased strength.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a seal structure for sealing an opening communicating with the outside air provided in a closed container housing an electronic device assembly, the adhesive sheet having an area larger than the opening; A seal sheet consisting of a backing sheet attached to the center of the adhesive surface of the adhesive sheet and having an area smaller than the adhesive surface and larger than the opening, the backing sheet covering the entire area of the opening. , and are pasted in an overlapping state around it and sealed.

[For production]

In the seal structure of the present invention, in the opening that communicates with the outside air provided in the airtight container, a sheet of aluminum or the like having a slightly larger area than the opening is placed in the center of the adhesive surface of the adhesive sheet, which has an area larger than the opening. By creating a seal structure in which a sealing sheet with a backing sheet made of metal foil is attached so that the backing sheet covers the entire area of the opening and is overlapped around the opening to form a sealed seal, the adhesive surface of the sealing sheet can be sealed. There is no risk of contamination inside the sealed container due to generated impure gas, and since the area corresponding to the opening is also reinforced by the lining layer sheet, the strength against stress caused by the pressure difference between the internal pressure of the sealed container and the outside pressure is increased. It will be done. As a result, the closed container can be easily made smaller and thinner.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the main parts of an example in which an embodiment of the sealing structure for an airtight container according to the present invention is used as a sealing structure for the opening of an airtight container housing a head disk assembly (HDA) in a magnetic disk device. It is a sectional view, and parts equivalent to those in FIG. 4 are given the same reference numerals.

In the figure, reference numeral 1 denotes an airtight container in which a base body 1a and a cover body ib are sealed, and a spindle motor 4 is connected between the base body 1a and the cover body lb inside, and a plurality of magnetic disks 5 are concentrically arranged. The spindle 3 to which the spindle hub 6 is attached is attached to the bearings 2a and 2b.
A head positioning mechanism 8 for positioning the magnetic head 7 for recording and reproducing with respect to the magnetic disk 5 is mounted on the support portion of the base body 1a with a bearing II.
It is disposed to support a rotating shaft lO connected to its drive motor 9 via a and llb.

As shown in FIG. 2, in the opening 41 provided in the cover body 1h constituting a part of the airtight container 1, a pressure-sensitive adhesive layer 53 of acrylic resin or the like is applied to a base sheet 52 made of synthetic paper, for example. At the center of the adhesive surface 53a of the adhesive sheet, which has an area larger than the opening 41, is coated with a metal foil, for example, a metal foil having a slightly larger area than the opening 41, such as aluminum (metal foil) which is relatively soft and has plasticity. 〇A sealing sheet 51 in which a backing sheet 54 coated with a fluorine-based resin such as fluorinated ethylene propylene is attached to the surface of the foil with the resin-coated side facing outward is shown in the plan view of FIG.
As shown in the cross-sectional view of the main part in Figure (b), the backing sheet 5
4 covers the entire area of the opening 41 and is attached in an overlapping state around the opening 41 to form a seal structure.

In such a seal structure, the portion of the seal sheet 51 corresponding to the opening 4I is thickly reinforced by pasting the backing sheet 54, so that the portion of the seal sheet 51 corresponding to the opening 4I is reinforced mechanically against stress due to the pressure difference between the inside and outside of the container. Strength is increased. That is, it is stronger against tensile stress and shear stress than conventional seal sheets, and has excellent corrosion resistance, and furthermore, the generation of impurity gas from the adhesive surface 53a into the opening 41 is suppressed.

In addition to the seal sheet 51 described above, the seal sheet used in the seal structure of this embodiment is, for example, an aluminum foil whose surface is coated with a fluorine-based resin such as fluorinated ethylene propylene, and whose back surface is coated with the aforementioned resin. A seal sheet in which a sheet similar to the adhesive sheet is attached as a backing sheet to the center of the adhesive surface of the adhesive sheet coated with a pressure adhesive layer;
Alternatively, although it is somewhat inferior to aluminum (^ff) Ffi in terms of plasticity, it can be used, for example, at the center of the adhesive surface of an adhesive sheet in which the pressure-sensitive adhesive layer is applied to a foil made of stainless steel with a thickness of about 20 μm. In addition, mechanical strength and corrosion resistance can be improved by using a seal sheet or the like in which a backing sheet coated with a fluorine-based resin such as fluorinated ethylene propylene is attached to the surface of aluminum foil (A I ). Figure 3 (al
, fb) can achieve the same effect as the embodiment.

Furthermore, if the surface around the opening 41 is flat, a highly rigid stainless steel plate having a thickness of, for example, about 0.1 n+m may be used as the backing sheet, and the same effect can be obtained. Is possible.

〔Effect of the invention〕

As is clear from the above description, according to the sealing structure of the hermetic container according to the present invention, the opening communicating with the outside air provided in the hermetic container housing an electronic device assembly such as a magnetic head/disk assembly, etc. By pasting and sealing a seal sheet with a backing sheet with an area that sufficiently covers the entire area of the opening in the center of the adhesive surface of the adhesive sheet, which has an area larger than the area of the opening, it is possible to prevent leakage from the adhesive surface into the opening. The generation of impure gas is suppressed, and a seal structure with improved mechanical strength can be realized.

In addition, by applying such a seal structure to an airtight seal of an opening communicating with outside air provided in a closed container housing a magnetic head/disk assembly of a magnetic disk device,
This has excellent practical effects, such as reducing the cost of the sealing structure and facilitating the miniaturization and thinning of the closed container as the device is miniaturized.

Therefore, it is extremely advantageous to apply the present invention to sealing an opening communicating with the outside air provided in a closed container housing various electronic device assemblies and intended to be made smaller and thinner.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing an example of the sealing structure for an airtight container according to the present invention when it is used as a sealing structure for the opening of an airtight container housing an HDA in a magnetic disk device; The figure is a plan view for explaining the seal sheet according to the present invention, FIGS. Fig. 4 is an essential part plan view, and Fig. 4 is a sectional view of a main part, and Fig. 4 is an essential part for explaining the sealing structure of a conventional sealed container in terms of the sealing structure of the opening of a sealed container containing F (DA) in a magnetic disk drive. 5(a) and 5(b) are views showing an example of the seal structure of a conventional airtight container, and FIG. 5(a) is a plan view of the main part, and FIG.
) is a sectional view of the main part, FIGS.
b) is a sectional view of a main part. Figures 1 to 3 (a), (In bl, 1 is a closed container, 1b is a cover integrated, 41 is an opening, 51 is a seal sheet, 52 is a base sheet, 53 is a pressure sensitive adhesive layer, 53
a indicates the adhesive surface, and 54 indicates the backing sheet. )Ni sasi rumor 9^5 2be, sheet di vote sister plane m(Q)
HP Nookishiro Kugi+b)Jishikashinltlkaku/#fginzmNotification device A>-Le course n Atonement temple country No. 7 Figure 3

Claims (1)

[Claims] A seal structure for sealing an opening (41) communicating with outside air provided in a closed container (1) containing an electronic device assembly, the sealing structure having a larger area than the opening (41). an adhesive sheet; and a backing sheet (54) attached to the center of the adhesive surface (53a) of the adhesive sheet and having an area smaller than the adhesive surface (53a) and larger than the opening (41).
), the backing sheet (54) covers the entire area of the opening (41) and is overlapped around the opening (41) to seal the container. structure.