JP2005339739A - Seal member, seal member forming sheet, magnetic disk device, manufacturing method of seal member and manufacturing method of magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a magnetic disk device in which a gasket of which the workability for incorporating into a casing portion is improved and the shape is easily formed, is incorporated. <P>SOLUTION: A center hole 32 corresponding to the shape of an opening section 2a of a case 2 which stores a magnetic disk 3 or the like, is made on a ribbon shaped sheet 50 made of rubber, for example. An outer periphery formed portion of the center hole 32 on the sheet is heated and melted to form a gasket forming sheet 30 having an inflated ceiling section 18b. Then, a top cover 9 is screwed onto the case 2 through the sheet and the sheet portion which is protruded from the case 2 is cut off. Thus, production of a gasket 18 and assembling of the gasket 18 into a magnetic disk device 1 are simultaneously attained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal member for ensuring airtightness in an enclosure used for electronic equipment, a seal member forming sheet for forming the seal member, a magnetic disk device incorporating the seal member, and the seal member And a manufacturing method of a magnetic disk device manufactured by incorporating the manufacturing method of the seal member.

  Conventionally, a hard disk drive has a substantially sealed structure in which a read / write mechanism for reading or writing data on a magnetic disk is housed in an enclosure. This structure is employed to stabilize the flying operation of the magnetic head relative to the magnetic disk during recording / reproduction and to prevent dust and the like from entering the read / write mechanism.

Therefore, a gasket is generally provided between the enclosure and the lid that closes the opening as a seal member that ensures airtightness in the housing. Here, as a manufacturing method of this type of gasket, for example, a manufacturing method in which an elastic material such as rubber is molded using a mold is known (for example, see Patent Document 1).
JP 2000-100125 A

However, the gasket manufactured in this way has the following problems.
That is, along with the demand for downsizing of today's hard disk drives, the gaskets incorporated in the housings are also required to be smaller and thinner. Therefore, when a mold is applied to the molding of such a small gasket, an expensive mold with high dimensional accuracy is required, and of course, it is difficult to accurately mold the shape of the seal portion. .

  In addition, such a small-sized gasket does not provide sufficient rigidity for handling a single component, so that it is difficult to handle. For example, a deformation defect occurs during cleaning after molding, It is difficult to work in the body part. Furthermore, it is difficult to automate the assembly work of products due to such circumstances.

  Therefore, the present invention has been made to solve the above-mentioned problems, and in addition to being able to easily mold a part shape, it is possible to improve the workability when incorporating it into a housing part, and furthermore, Seal member, seal member forming sheet, magnetic disk device incorporating the seal member, method for manufacturing the seal member, and method for manufacturing the magnetic disk device incorporating the method for manufacturing the seal member The purpose is to provide.

  In order to achieve the above object, a sealing member according to the present invention includes a sheet-like outer frame portion in which a central hole having a shape corresponding to an opening portion of an enclosure closed by a lid body is formed, and the outer frame portion. And a sealing part formed by bulging the inner peripheral edge in the thickness direction of the outer frame part.

  In the present invention, for example, a central hole is perforated in a sheet having a predetermined thickness, and the sealing portion is formed so as to bulge the outer peripheral edge forming portion (inner peripheral edge of the outer frame portion) of the neutral hole in the sheet. Thus, the seal member can be easily manufactured. Furthermore, in the present invention, since the outer frame part of the outer edge of the sealing part can be applied as a handling part, for example, the handling of the sealing member is facilitated, and for example, the sealing member can be directly touched without touching the sealing part (sealing part). Can be easily installed. In addition, according to the present invention, since the formation of the seal member and the handling of the seal member are easy as described above, it is possible to suitably cope with the downsizing of the seal member and the downsizing of the electronic apparatus to which the seal member is applied. be able to.

  Here, in the present invention, the bulging shape of the sealing portion may be formed by heating and melting the inner peripheral edge of the outer frame portion. In this case, examples of the constituent material of the seal member include rubber materials and resin materials that perform so-called self-molding due to heat shrinkage and surface tension caused by heating.

  Moreover, in the sealing member of this invention, the outer frame part formed in the sheet form can also be utilized as a site | part for joining to one of the said enclosure or the said cover body. That is, by attaching the outer frame portion of the seal member to the enclosure or lid, for example, when an electronic device that uses the enclosure as a housing fails and the lid is removed for repair, etc. The opening operation (repair) can be easily performed without fouling the internal components.

The sealing member forming sheet according to the present invention includes a sheet main body in which a plurality of central holes each having a shape corresponding to an opening of an enclosure closed by a lid are arranged at a predetermined interval, and the sheet main body And a sealing portion formed by bulging the outer peripheral edge forming portions of the plurality of central holes in the thickness direction of the sheet body.
In the present invention, for example, according to the position of the outer portion of the enclosure and the lid, the sheet body is continuously cut and the outer frame portion having the central hole is sequentially formed, so that the sealing member of the above-described invention is obtained. It becomes possible to manufacture efficiently.
Further, by applying the above-described seal member to the magnetic disk device, the magnetic disk device main body can be reduced in size and high productivity can be obtained.

  Further, the manufacturing method of the sealing member according to the present invention includes a step of perforating a central hole having a shape corresponding to the opening of the enclosure on a sheet formed larger than the outer shape of the enclosure closed by the lid, A sealing portion forming step of forming a sealing portion by expanding an outer peripheral edge forming portion of the central hole in the punched sheet in the thickness direction of the sheet, and the sealing formed on the sheet by the sealing portion forming step And a step of aligning the outer edge portion of the opening of the enclosure, a step of joining the enclosure and the lid body with the aligned sheet sandwiched therebetween, and between the enclosure and the lid body A sheet excision process for excising a part of the sheet sandwiched between the enclosure and the outer shape of the lid. And wherein the Rukoto.

  In this invention, after the sheet having the central hole is aligned and the enclosure and the lid are assembled with the sheet sandwiched therebetween, unnecessary portions outside the seal are cut according to the outer shape of the enclosure, for example, and removed. It is. Therefore, according to the present invention, for example, even when a small-sized seal member is manufactured, it is not necessary to prepare an expensive mold with high dimensional accuracy, for example, and an inexpensive seal member can be efficiently manufactured. it can. Further, according to the present invention, it is possible to substantially simultaneously manufacture and incorporate the seal member. Therefore, even if the seal member is small in size, it is not necessary to handle it directly, so that assembly can be automated and productivity can be increased. Further, in the present invention, by applying the above-described sealing member forming sheet, continuous production of the sealing member and its incorporation can be easily realized, and further productivity improvement can be achieved.

Moreover, in this invention, it is preferable to apply the rubber material etc. as a material of a sheet | seat similarly to the above, and to form the bulging shape of a sealing part by heat-melting the outer periphery formation part of the center hole in a sheet | seat.
Here, the dimensional difference between the opening size of the central hole and the opening size of the sealing portion that is larger than the opening size of the central hole by the heating and melting is set within a range of 3 to 5 times the thickness of the sheet. Thus, an optimum machining margin by heating and melting the sealing portion is obtained at the outer peripheral edge forming portion of the central hole, and the sealing portion can be formed in a desired shape.
Further, after the sheet excision step, the sheet portion located on the outer edge side of the sealing portion is joined to one of the enclosure or the lid body by adhesion or the like, and the enclosure is opened as described above. Parts repair etc. can be performed suitably.
Further, by adopting such a manufacturing method of the seal member, this can be easily performed even when manufacturing, for example, an ultra-small size magnetic disk device in which it is difficult to ensure airtightness.

  As described above, according to the present invention, in addition to being able to easily mold the part shape, it is possible to improve the workability at the time of incorporation into the housing part, and it is also suitable for the reduction in the size of the part. The sealing member, the sealing member forming sheet, the magnetic disk device in which the sealing member is incorporated, the manufacturing method of the sealing member, and the manufacturing method of the magnetic disk device incorporating the manufacturing method of the sealing member can be provided. .

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 is an exploded perspective view of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view schematically showing an internal configuration of the magnetic disk device, and FIG. 3 is a gasket incorporated in the magnetic disk device. The perspective view which shows the sheet | seat for gasket formation for obtaining, FIG. 4 is the (AA) sectional drawing.
As shown in FIG. 1, a magnetic disk device 1 according to this embodiment includes a rectangular box-like case 2 as an enclosure (specifically, an enclosure base) having an opening 2a formed on the upper surface, and an opening of the case 2 A top cover 9 (enclosure top cover) is provided as a lid that is fixed to the case 2 through a plurality of screws 11 so as to close the portion 2a.

  In the case 2, a magnetic disk 3, a spindle motor 4 as a disk drive mechanism that supports and rotates the magnetic disk 3, and a head actuator 25 are disposed. Here, as the magnetic disk 3, for example, a platter having a diameter of 1.8 inches and having magnetic recording layers on both sides is employed. These magnetic disks 3 are fitted on the outer periphery of a hub (not shown) of the spindle motor 4 and are fixed by a clamp spring 12. That is, the magnetic disk 3 rotates integrally by driving the spindle motor 4.

  The head actuator 25 includes a carriage 6 configured by stacking a plurality of head arm assemblies 15, a bearing unit that rotatably supports the carriage 6, and a voice coil motor 8 that drives the carriage 6. The head arm assembly 15 includes a suspension 20 having a magnetic head slider 5 mounted with a head (magnetic pole element) for reading and writing signals on the magnetic disk 3 at the distal end, and an arm 7 that supports the suspension 20 at the distal end. Is done.

  Further, the case 2 houses a substrate unit 10 on which a head driver IC and the like are mounted. Further, on the back side of the component housing portion of the case 2, a spindle motor 4, a voice coil motor 8, and a CPU for controlling the head, a memory, a hard disk controller, and other circuits are mounted via the board unit 10. A printed circuit board (not shown) is mounted by screwing or the like.

  Further, a minute breathing hole 13 is formed on the top cover 9 of the magnetic disk device 1 for adjusting the humidity between the inside of the case 2 and the outside air. On the breathing hole 13, a sheet 14 having a smaller diameter hole than that of the breathing hole 13 is attached. The sheet 14 has an opening amount of its own hole, for example, due to humidity change. It is made of a material that expands or contracts accordingly. Further, in the magnetic disk device 1, a gasket 18 is interposed between the outer edge portion of the opening 2a of the case 2 and the peripheral portion of the top cover 9 that closes the opening 2a, thereby ensuring the airtightness inside the device. Has been.

Next, the structure of the gasket 18 will be described with reference to FIGS.
That is, the gasket 18 as a sealing member includes a sheet-like (strip-like) outer frame portion 18a in which a central hole 32 having a shape corresponding to the opening 2a of the case 2 closed by the top cover 9 is formed, and the outer frame. And a sealing portion 18b formed by expanding the inner peripheral edge of the portion 18a in the thickness direction of the outer frame portion. That is, the sealing portion 18b and the outer frame portion 18a for sealing (sealing) the gap between the case 2 and the top cover 9 are formed so as to go around the entire outer peripheral edge of the opening 2a of the case 2. (See FIG. 1 etc.).

  Here, as a material of the gasket 18, that is, a material of a gasket forming sheet 30 to be described later, a plastic sheet (resin sheet) such as polypropylene, polyethylene, nylon, polyimide, acrylic, and PET (polyethylene terephthalate), nitrile rubber, and butadiene A rubber sheet using a rubber material such as rubber, EPDM (ethylene propylene rubber), or fluorine rubber can be used. The plastic sheet is advantageous in terms of handling properties and cleanability, while the rubber material has the advantage that the built-in shape can be finely adjusted due to its stretchability.

  In the gasket 18 made of such a material, the bulging shape of the sealing portion 18b is formed by heating and melting the inner peripheral edge of the outer frame portion 18a as shown in FIGS. That is, the parts formed of the above-described materials have a so-called self-molding property in which heat shrinkage and surface tension act by heating the surface.

  Further, in the gasket 18, as shown in FIG. 2, a sheet-like outer frame portion 18 a is used as a part to be joined to one of the case 2 or the top cover 9, for example. In this embodiment, the structure by which the outer frame part 18a was adhere | attached on the top cover 9 via the adhesive agent 19 is illustrated. In other words, by bonding the outer frame portion 18a of the sealing member to the top cover 9 or the case 2, for example, an electronic device using the enclosure as a casing breaks down, and the lid is removed for repair. In some cases, the opening operation of the top cover 9 can be easily performed while preventing the gasket 18 from coming into contact with precision components such as the magnetic disk 3 and the magnetic head in the case 2.

  Here, as shown in FIGS. 3 and 4, in the above-described gasket forming sheet 30, the central hole 32 of the gasket 18 to be formed is juxtaposed on the sheet main body 31 at a predetermined interval. . Further, the gasket forming sheet 30 is previously formed with the sealing portion 18b described above at the outer peripheral edge forming portion of the central hole 32 (the inner peripheral edge of the outer frame portion 18a to be formed later). That is, as shown in FIGS. 2 and 4, the sheet body 31 is continuously cut in accordance with the positions of the outer portions of the case 2 and the top cover 9, and the outer frame portion 18 a having the central hole 32 is sequentially formed. By going, the above-described gasket 18 and the magnetic disk device 1 incorporating the gasket 18 can be efficiently manufactured.

Next, a configuration of a manufacturing apparatus for manufacturing the gasket forming sheet 30, a manufacturing method of the gasket 18 obtained from the gasket forming sheet 30, and a manufacturing method of the magnetic disk device 1 incorporating the gasket 18 are shown in FIG. It will be described with reference to FIG.
Here, FIG. 5 is a perspective view schematically showing the manufacturing apparatus 29 for the gasket forming sheet 30, and FIG. 6 is a cross-sectional view for explaining the manufacturing process of the gasket forming sheet 30 performed using the manufacturing apparatus 29. 7A and 7B are perspective views for explaining a method of manufacturing the magnetic disk device 1 performed using the gasket forming sheet 30. FIG. 6 (a), 6 (b), 6 (c), and 6 (d) are diagrams for explaining the operations of the punching mechanism 46, the suction mechanism 47, and the heating mechanism 48 included in the manufacturing apparatus 29, respectively. It is sectional drawing of the sheet | seat 30 for gasket formation (gasket formation part 30a) manufactured with the figure and the manufacturing apparatus 29. FIG.

First, the structure of the manufacturing apparatus 29 for manufacturing the gasket forming sheet 30 will be briefly described.
As shown in FIG. 5, the manufacturing apparatus 29 includes a supply reel 41, a take-up reel 42, a sheet conveyance mechanism 49 including a conveyance guide 43, a cradle 45, and an elastomer protector 46a. The punching mechanism 46 includes a plurality of blade portions 46b, the suction mechanism 47 includes suction heads 47a and 47b, and the heating mechanism 48 includes a heating block 48a. The sheet conveying mechanism 49 conveys a ribbon-like (tape-like) sheet 50 that is a material sheet of the gasket forming sheet 30. More specifically, the sheet conveying mechanism 49 sequentially forms a processed sheet portion for obtaining the gasket 18 immediately below the punching mechanism 46, the suction mechanism 47, and the heating mechanism 48 that face the ribbon-like sheet 50 on the cradle 45. Transport intermittently. Further, a concave portion 45a is provided at a portion of the cradle 45 facing the heating mechanism 48 in consideration of the convex shape of the heating block 48a.

  Here, the material of the ribbon-like sheet 50 can be freely selected from various plastic materials and rubber materials satisfying characteristics such as the desired hardness, melting point, glass transition point, and gas release performance. . Preferably, a material having a melting point of 200 ° C. or lower and a glass transition point (Tg) of −10 ° C. or lower is preferable, such as polyethylene and polypropylene. Further, the thickness of the sheet is preferably selected in consideration of the thickness of the target seal, the strength at the time of manufacture, the handleability, the material hardness, and the like.

Next, a method for manufacturing the gasket forming sheet 30 by the manufacturing apparatus 29 will be described.
First, as shown in FIG. 6A, the punching mechanism 46 is lowered toward the sheet side and the screw 11 for fixing the top cover is inserted into the ribbon-like sheet 50 that has been intermittently conveyed to the sheet conveying mechanism 49. The screw insertion hole 33 and the central hole 32 are drilled by a plurality of blade portions 46b (see FIG. 3). At this time, the protector 46a is pressed against the cradle 45 side through the sheet and is elastically deformed, whereby the plurality of blade portions 46b protrude through the protector 46a and correspond to the hole portions of the ribbon-shaped sheet 50. Cut the part. Thereafter, when the punching mechanism 46 rises, the protector 46a returns to its original state, and accordingly, for example, a sheet piece attached to the blade portion 46b when the sheet is cut is removed.

Subsequently, as shown in FIG. 6B, the suction mechanism 47 is lowered to the sheet side, and the cut sheet portions 18e and 18f punched out from the ribbon-like sheet 50 by the punching mechanism 46 are moved by the suction heads 47a and 47b. Aspirated and removed.
Next, as shown in FIG. 6C, the heating block 48 a of the heating mechanism 48 is lowered to the sheet side, and the heating block 48 a is inserted into the central hole 32 from which the cut sheet portion 18 e has been removed by the suction mechanism 47. The As a result, the outer peripheral edge forming portion of the central hole 32 on the sheet is heated and melted, so that a self-molding action is performed, and a sealing portion 18b that bulges in the thickness direction of the sheet is formed. Here, the heating block 48a has a tapered shape that narrows toward the tip (lower part). For example, it is possible to control the cross-sectional shape of the sealing portion 18b by applying a temperature gradient so that the temperature increases from the distal end side to the proximal end side of the heating block 48a.

  The heating block 48a is preferably coated with a fluorine-based organic material or a lubricant for the purpose of preventing the melt of the sheet material from being transferred and adhered. In addition, as a heating method for forming the sealing portion 18b, it is possible to use a heat source such as various laser beams or a high-temperature gas flow. As a restriction when using these heat sources, it is desirable to select a method capable of locally heating a portion where the target sealing portion is formed in a short time. Further, when there is a concern about combustion of the sheet material during heating, it is preferable to use an inert gas such as nitrogen in the environment, for example.

  Further, the ribbon-like sheet 50 has a dimensional difference d3 between the opening size d1 of the central hole 32 perforated by the punching mechanism 46 and the opening size d2 of the sealing portion 18b which is larger than the opening size of the central hole 32 by heating and melting. By controlling the thickness within a range of 2 to 8 times the thickness t1, it is possible to prevent the sealing portion from melting and the shape of the sealing portion from becoming uneven in the cross-sectional direction (particularly the thickness direction of the sheet). Can do. Further, by adjusting the dimensional difference d3 within a range of 3 to 5 times the thickness of the ribbon-like sheet 50, a more uniform and stable sealing portion can be formed.

  Further, the heating mechanism 48 is raised from the sheet side, and as shown in FIG. 6D, the sheet in which the sealing portion 18b is formed at the outer peripheral edge forming portion of the central hole 32 is taken up on the take-up reel 42 side. Thereafter, for example, a cleaning process is performed, whereby the gasket forming sheet 30 is obtained.

Further, a method for manufacturing the magnetic disk device 1 will be described.
Here, in this process, an assembling procedure by an easy assembly machine is assumed, and the process may be performed continuously, for example, following the manufacturing process of the gasket forming sheet 30.
First, both side edges of the gasket forming sheet 30 are fixed to the frame 53. Further, the case 2 in which all the internal components including the magnetic disk 3 and the carriage 6 are accommodated in advance is placed on a position adjusting table 51 that is movable in three axial directions (XYZ directions). Next, in the vertical and horizontal directions (XY directions), the sealing portion 18b formed on the outer peripheral edge of the central hole 32 in the gasket forming sheet 30 and the outer edge portion of the opening 2a of the case 2 are aligned. In this state, the position adjusting table 51 is further moved in the height direction (Z direction) to bring the sealing portion 18b into contact with the outer edge portion (seal surface) of the opening 2a of the case 2. Next, the edge portion of the top cover 9 and the gasket forming portion 30a are aligned through the screw insertion hole 33 and the like, and the case 2 and the top cover 9 are fastened with the screws 11 with the gasket forming sheet 30 interposed therebetween. . Finally, a portion of the sheet sandwiched between the case 2 and the top cover 9 that protrudes from the outer shape of the case 2 and the top cover 9 (edge of the sheet) is cut using, for example, a cutter knife 52. Thereby, the magnetic disk device 1 can be obtained.

  As described above, according to the present embodiment, for example, there is a request for manufacturing an ultra-small magnetic disk device having a size of 1.8 inches or less, for example, in the case of manufacturing a small-sized gasket, for example. However, it is not necessary to prepare an expensive metal mold with high dimensional accuracy, and an inexpensive gasket can be manufactured efficiently. Moreover, according to this embodiment, the gasket 18 can be substantially manufactured and assembled at the same time. This eliminates the need to handle the gaskets directly when assembling the components, so that, for example, automation can be achieved when assembling a small-size magnetic disk drive. Further, for the above-mentioned gasket handling, for example, a costly part such as integrally molding rubber on a metal frame such as a stainless steel plate to increase the rigidity of the gasket becomes unnecessary, and the manufacturing cost can be reduced as described above. Further, in this embodiment, by using the ribbon-like sheet 50 and the above-described gasket-forming sheet 30 obtained from the ribbon-like sheet 50, the continuous production of the gasket 18 and its incorporation can be easily realized, and further production can be achieved. It is possible to improve the performance.

  Although the present invention has been specifically described above with reference to the embodiment, the present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiment, the gasket for the magnetic disk device and the manufacturing method thereof have been described. However, the present invention is applied not only to the magnetic disk device but also to a gasket for sealing an enclosure of any electronic device and the manufacturing method thereof. Can be applied. Further, as shown in FIG. 2, instead of the adhesive 19 applied in the joining of the top cover 9 (or case 2) and the outer frame portion 18a of the gasket 18, it has a hook shape as shown in FIG. By using the opening jig 34 and the like, as with the effect of the adhesive 19, there is no concern about contamination or damage of the disk or head due to the contact of the gasket 18 when the magnetic disk device is repaired. The top cover 9 can be easily opened.

  Further, as a material for forming the sealing portion 18b of the gasket 18, the same material as the ribbon-like sheet 50 and the gasket-forming sheet 30 or various adhesive materials can be appropriately selected. Here, as a method of manufacturing the sealing portion 18b made of another material for the ribbon-like sheet 50 or the gasket-forming sheet 30, for example, after applying a screen printing method, a molding method, or a paste-like sealing material, Examples thereof include a dispenser method for curing using ultraviolet rays and the like, a method for punching an adhesive material with a mold, and the like. Using these manufacturing methods, as shown in FIG. 9, for example, a sealing portion 18 c that bulges in the thickness direction of one surface of the sheet may be formed on the entire outer periphery of the central hole. As shown in FIG. 10, a sealing portion 18 d having a double sealing structure arranged in parallel in the direction along the surface of the sheet may be formed. Further, in this case, a higher sealing performance can be obtained by providing the convex portion 35 corresponding to the concave portion between the pair of sealing portions on the housing side such as the top cover 9.

Next, an example explains the present invention.
(Example 1)
Here, Example 1 will be mainly described based on the manufacturing method described with reference to FIGS. 5 to 7 in the embodiment of the present invention.
First, ten sheets of PET (polyethylene terephthalate) having a thickness of 0.1 mm, a width of 140 mm, and a length of 1200 mm are prepared as a ribbon-like sheet 50, and a 1.8-inch drive (with a platter having a diameter of 1.8 inches) is prepared. For use, sheets were punched at 100 mm intervals so that a central hole 32 with a maximum length of 6.9 mm and a width direction of 5 mm could be obtained. At this time, a screw insertion hole 33 having a diameter of 3 mm was simultaneously drilled. As the punching layout, a layout in which the width direction of the ribbon-like sheet 50 and the longitudinal direction of the central hole 32 are orthogonal to each other is selected as shown in FIG. Further, both ends 100 mm in the longitudinal direction of the ribbon-like sheet 50 were used as unprocessed areas for use in conveying the sheet. Thereafter, a sealing material having a diameter of 0.8 mm was applied along the outer peripheral edge of the central hole 32 using an acrylic UV curable resin manufactured by ThreeBond Co., Ltd., followed by UV curing and baking at 80 ° C. for 3 hours, respectively. Processing was performed to form a sealing portion 18c, and after neutral detergent cleaning, the shape was confirmed and subjected to a mounting test and a leak test in a 1.8 inch drive.

(Comparative example of Example 1)
On the other hand, a stainless steel plate having a minimum width of 1.5 mm and a thickness of 0.1 mm was processed by press punching to prepare a frame-like frame corresponding to the opening 2 a of the case 2. At this time, a hole corresponding to the screw insertion hole was punched out by pressing. After that, a thermoplastic ethylene propylene diene monomer-based seal rubber is molded on both sides of the frame to form a sealing portion, and after a predetermined cleaning treatment, the shape deformation and the like are confirmed and bent. Comparative materials were used except for defective products such as these.

Further, in Example 1, the test for incorporation into a 1.8-inch hard disk drive was performed using the simple automatic assembly machine shown in FIG. However, since the above simple automatic assembly machine cannot be applied to the comparative example, it was manually assembled.
After that, about 0.2 Mpa of pressurized air is injected from a test port (for example, the breathing hole 13) formed in the top cover 9, and after sealing, the amount of pressure drop (velocity) for 10 seconds is measured, and the pressure drop When the amount is less than 0.05 MPa, the leak evaluation is OK, and for those exceeding 0.05 MPa, the leak evaluation is NG.
Further, when the acceptable product was further disassembled and a transfer product due to contact of the gasket was observed on the magnetic disk 3, it was regarded as media contamination NG.
Table 1 below shows the results of each assemblability evaluation test of Example 1 and Comparative Example.

  As apparent from Table 1 above, according to the manufacturing method according to the first embodiment, a magnetic disk device can be manufactured without causing product defects.

(Examples 2-9)
Next, Examples 2 to 9 of the present invention will be described.
Also here, each example will be mainly described based on the manufacturing method described with reference to FIGS. 5 to 7 in the embodiment of the present invention.
Here, in these examples, the material and / or thickness of the ribbon-like sheet 50 is different (see Table 2 below). Furthermore, as the ribbon-like sheet 50, for example, a sheet having a width of 140 mm and a length of, for example, 5.5 m is prepared.

In addition, gaskets and magnetic disk devices corresponding to the size for a 1.8 inch hard disk drive are manufactured for 100 units by the manufacturing method described with reference to FIGS. An internal leak test was conducted.
The leak test conditions were as follows. Pressure air of about 0.2 Mpa was injected from a test port on the top cover 9, and after sealing, the amount of pressure drop (velocity) for 10 seconds was measured, and the pressure drop amount was 0.05 MPa. The excess was determined as leak NG.
The leak test results of Examples 2 to 9 are shown in Table 2 below.

  As shown in Table 2, there was no leakage problem for any of the magnetic disk units that individually incorporated eight types of gaskets with different materials, thicknesses, or shapes. It was confirmed that the airtightness of the was secured.

  Further, an opening work test of the top cover 9 was conducted on 100 1.8 inch hard disk drives in which the gasket of Example 2 was incorporated. At this time, the test was conducted in a form using the opening jig 34 having the hook shape shown in FIG. Specifically, an opening method is adopted in which the hook portion of the opening jig 34 is inserted between the peripheral edge portion of the opening 2 a of the case 2 and the outer frame portion 18 a of the gasket 18 to lift the top cover 9 together with the gasket 18. It was. After opening, the magnetic disk surface was visually inspected for contaminants, and no contaminants due to gasket contact were observed.

1 is an exploded perspective view of a magnetic disk device according to an embodiment of the present invention. FIG. 3 is a cross-sectional view schematically showing an internal configuration of the magnetic disk device. The perspective view which shows the sheet | seat for gasket formation for obtaining the gasket integrated in this magnetic disc apparatus. (AA) sectional drawing of the sheet | seat for gasket formation of FIG. The perspective view which shows schematically the manufacturing apparatus of the sheet | seat for gasket formation of FIG. Sectional drawing for demonstrating the manufacturing process of the sheet | seat for gasket formation performed using the manufacturing apparatus of FIG. The perspective view for demonstrating the manufacturing method of the magnetic disc apparatus performed using the sheet | seat for gasket formation of FIG. FIG. 3 is a cross-sectional view of another magnetic disk device having a structure different from that of the magnetic disk device shown in FIG. 2. Sectional drawing which shows the other sheet | seat for gasket molding from which the structure of the sheet | seat for gasket formation of FIG. 4 and a sealing part differs. Sectional drawing which shows the sheet | seat for gasket molding of FIG.4 and FIG.9 and the other sheet | seat for gasket molding from which the structure of a sealing part differs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Magnetic disk apparatus, 2 ... Case, 2a ... Opening part, 3 ... Magnetic disk, 9 ... Top cover, 18 ... Gasket, 18a ... Outer frame part, 18b, 18c, 18d ... Sealing part, 18e ... Cutting sheet part, DESCRIPTION OF SYMBOLS 19 ... Adhesive, 29 ... Gasket formation sheet manufacturing apparatus, 30 ... Gasket formation sheet, 30a ... Gasket formation part, 31 ... Sheet main body, 32 ... Center hole, 33 ... Screw insertion hole, 34 ... Opening jig, 46 ... punching mechanism, 46a ... protector, 46b ... blade part, 48 ... heating mechanism, 48a ... heating block, 49 ... sheet conveying mechanism, 50 ... ribbon-like sheet, 51 ... position adjusting table, 52 ... cutter knife, d1, d2 ... Opening size, d3 ... Dimensional difference, t1 ... Ribbon sheet thickness

Claims (10)

A sheet-like outer frame portion in which a central hole having a shape corresponding to the opening of the enclosure closed by the lid is perforated;
A sealing member comprising: a sealing portion formed by bulging an inner peripheral edge of the outer frame portion in a thickness direction of the outer frame portion.   The sealing member according to claim 1, wherein the sealing portion is formed by heating and melting an inner peripheral edge of the outer frame portion.   The seal member according to claim 1 or 2, wherein the outer frame portion formed in the sheet shape is used as a portion to be joined to one of the enclosure or the lid. A sheet body in which a plurality of central holes having a shape corresponding to the opening of the enclosure closed by the lid are arranged at a predetermined interval;
A sealing member forming sheet, comprising: a sealing portion formed by bulging outer peripheral edge forming portions of the plurality of central holes in the sheet body in a thickness direction of the sheet body.   4. A magnetic disk device, wherein the seal member according to claim 1 is incorporated between an outer edge portion of an opening of an enclosure and a lid that closes the opening. Drilling a central hole having a shape corresponding to the opening of the enclosure for a sheet formed larger than the outer shape of the enclosure closed by the lid;
A sealing part forming step of forming a sealing part by expanding an outer peripheral edge forming part of the central hole in the perforated sheet in a thickness direction of the sheet;
Aligning the sealing portion formed on the sheet by the sealing portion forming step and an outer edge portion of the opening of the enclosure;
Bonding the enclosure and the lid with the aligned sheet sandwiched therebetween;
A sheet cutting step for cutting a portion of the sheet sandwiched between the enclosure and the lid that protrudes from the outer shape of the enclosure and the lid.   The method for manufacturing a sealing member according to claim 6, wherein in the sealing portion forming step, the sealing portion is formed by heating and melting an outer peripheral edge forming portion of the central hole in the sheet.   The dimensional difference between the opening size of the central hole and the opening size of the sealing portion that expands from the opening size of the central hole by the heat melting is in a range of 3 to 5 times the thickness of the sheet, The manufacturing method of the sealing member of Claim 6 or 7.   The sealing member according to claim 7 or 8, further comprising a step of joining a sheet portion positioned on an outer edge side of the sealing portion to one of the enclosure or the lid after the sheet cutting step. Manufacturing method.   10. A method for manufacturing a magnetic disk device, wherein the method is manufactured by incorporating the method for manufacturing a seal member according to claim 6.

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