JP2014086682A - Housing case and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing case of which the sealed structure can be secured even under a severe environment, and a manufacturing method thereof.SOLUTION: A thin film 5 for bonding is formed beforehand on an open end face of a case member 2 formed from a metal, such that a seal member 4 and the case member 2 are adhered via the thin film 5 for bonding. In such a configuration, the thin film 5 for bonding and the case member 2 are being firmly bonded, such that C1 ion or water molecules cannot reach the clearance therebetween. Thus, even under such a severe environment that sea water (salt water), snow melting material or rainwater is deposited, a sealed structure of a housing case 1 can be secured.

Description

  The present invention relates to a storage case that seals the inside by bonding a case member and a lid with a seal member, and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a storage case has been proposed in which a case member and a lid are bonded via a seal member to seal the inside (for example, see Patent Document 1). For example, the sealing structure of the storage case is such that a sealing member made of an adhesive is applied to an opening end surface of a case member having a bottomed cylindrical shape, and a lid is disposed thereon, and then the sealing member is cured. This is realized. In this way, the case member and the lid are bonded to each other by the seal member so that the airtightness is maintained.

JP 2007-2335013 A

  However, when at least one of the case member and the lid is made of metal, the sealing of the storage case may be impaired. FIG. 4A shows, as an example, a case where the case member J1 is made of metal and the lid portion J2 is made of resin. In this case, as shown in FIG. 4 (b), the case member J1 made of metal is corroded or the adhesive strength between the case member J1 and the seal member J3 is reduced, so that the gap is between the case member J1 and the seal member J3. Hole J4 opens. When this hole J4 advances, the inside and outside of the storage case penetrates as shown in FIG. 4C, and the seal is broken. For example, when the storage case is mounted on a vehicle, it may be exposed to a harsh environment where seawater (salt water), snow melting material, and rainwater adheres, and the Cl ions generated from these react with the metal. As a result, the member made of metal is corroded and the hole J4 is opened. In addition, the joining of the metal member and the seal member J3 is not a direct joining, but a joining with a relatively weak joining such as an intermolecular joining or a hydrogen bond, and therefore joining by water molecules present in the air. Is weakened, a gap is formed between them, and a hole J4 is formed.

  An object of this invention is to provide the storage case which can ensure a sealing structure also in a severe environment, and its manufacturing method in view of the said point.

  In order to achieve the above object, according to the first aspect of the present invention, at least one of the case member (2) and the lid (3) is made of metal, and the case member and the lid are made of metal. On the bonding surface between the configured member and the sealing member (4), the bonding between the metal and the sealing member is stronger than the bonding between the metal and the sealing member. Is also provided with a thin film for bonding (5) that provides strong bonding.

  In such a configuration, the bonding thin film and the member made of metal among the case member and the lid are in a state of being firmly bonded, so that Cl ions and water molecules cannot reach between them. . For this reason, it becomes possible to ensure the sealing structure of the storage case even in a harsh environment where seawater (salt water), snow melting material, and rainwater adhere.

  In the invention according to claim 3, in the step of preparing the case member and the step of preparing the lid portion, at least one of the case member and the lid portion is made of metal, and the case member is a pre-process of the bonding step. On the bonding surface between the member made of metal and the sealing member and the sealing member, the bonding between the metal and the sealing member is stronger than the bonding between the metal and the sealing member by plasma. It is characterized by performing a step of coating the bonding thin film (5), which is stronger than the bonding between the metal and the seal member.

  Thus, as a pre-process of the bonding process, the bonding thin film can be formed by plasma on the bonding surface between the case member and the cover member formed of metal and the sealing member. Thereby, the thin film for joining and the member comprised with the metal of the case member and the cover part can be made into the state joined firmly. Therefore, an effect similar to that of the first aspect can be obtained.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows an example of a corresponding relationship with the specific means as described in embodiment mentioned later.

It is sectional drawing of the storage case 1 concerning 1st Embodiment of this invention. It is the elements on larger scale of area | region R1 of FIG. 1 which showed the joining state of the thin film 5 for joining. It is the perspective view which showed the mode of the formation process of the thin film 5 for joining among the manufacturing processes of the storage case 1 shown in FIG. It is the expanded sectional view which showed the mode of the coating of the thin film 5 for joining. It is sectional drawing which showed an example of the storage case. It is the elements on larger scale of area | region R2 of Fig.4 (a) which showed a mode when corrosion etc. generate | occur | produced in case member J1. It is the elements on larger scale of area | region R2 of Fig.4 (a) which showed a mode when corrosion etc. of case member J1 advanced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
As shown in FIG. 1, the storage case 1 includes a bottomed cylindrical case member 2 having a hollow inside, and a lid portion 3 disposed on the opening end face side of the case member 2. ing. A seal member 4 made of an adhesive is disposed on the opening end surface of the case member 2, and the case member 2 and the lid portion 3 are bonded to each other by the seal member 4, thereby forming the storage case 1. .

  Specifically, in this embodiment, the case member 2 has a bottomed rectangular tube shape, and the seal member 4 is disposed on the entire surface of the circumference of the opening end surface surrounding the hollow portion. For this reason, between the case member 2 and the lid portion 3, the entire circumference is bonded by the seal member 4, and the inside of the storage case 1 is sealed.

  The case member 2 is made of a metal material such as aluminum, copper, copper nickel plating, iron, and stainless steel. The lid 3 is made of a resin material such as PPS (poniphenylene sulfide resin) or SPS (syndiotactic polystyrene resin). The seal member 4 is composed of an adhesive made of a thermosetting resin such as a silicone adhesive or an epoxy adhesive.

A bonding thin film 5 coated with plasma (plasma CVD) is formed on the opening end face of the case member 2, and the sealing member 4 is applied to the surface of the bonding thin film 5, thereby the case member. 2 and the lid 3 are bonded to each other through a seal member 4. The bonding thin film 5 is made of a material that is firmly bonded to the metal material and is bonded to the seal member 4 more firmly than the bond between the metal and the seal member 4. For example, silica (SiO _2). ) It is composed of a silicone-based thin film such as a thin film or a carbon-based thin film such as a carbon thin film. For example, when the bonding thin film 5 is formed of a silica thin film, the bonding thin film 5 composed of Si—O bonds is firmly bonded to the case member 2 as shown in FIG.

  In the storage case 1 configured as described above, since the bonding thin film 5 and the case member 2 are firmly bonded, Cl ions and water molecules cannot reach between them. For this reason, while being able to suppress corrosion of case member 2 comprised with metal, it can control that joining of case member 2 and seal member 4 is weakened, and can prevent that a hole opens between these. Therefore, the sealing structure of the storage case 1 can be ensured even in a harsh environment where seawater (salt water), snow melting material, and rainwater adhere.

  Then, the manufacturing method of the storage case 1 comprised as mentioned above is demonstrated with reference to Fig.3 (a), (b).

First, a case member 2 made of, for example, aluminum (ADC12, A5052) as a metal is prepared. Then, the step of coating the bonding thin film 5 is performed. Specifically, as shown in FIG. 3A, the plasma nozzle 10 is disposed at a position above a predetermined distance from the opening end surface of the case member 2. A desired voltage is applied to the plasma nozzle 10 and a desired gas is introduced between the plasma nozzle 10 and the case member 2. For example, when the bonding thin film 5 is composed of a silica thin film, a mixed gas obtained by mixing a gas containing one or more of air, nitrogen, oxygen, argon, and hydrogen and a silicon-containing gas can be used. A silicon-containing liquid may be used instead of the silicon-containing gas. Here, a voltage of 19 to 23 kHz and a voltage of about 1000 V is applied, and hexamethyldisiloxane (HMDSO: C ₆ H ₁₈ OSi ₂ ) vaporized at 50 liter / min is supplied at a flow rate of 6 liter / min. Like to do.

  Thereby, plasma is generated between the plasma nozzle 10 and the opening end face of the case member 2, and the composition element of HMDSO is turned into plasma. The plasma-formed composition element of HMDSO is deposited on the opening end face of the case member 2, whereby a silica thin film is coated as the bonding thin film 5 as shown in FIG.

  Then, the plasma nozzle 10 is moved along the opening end surface of the case member 2 for one round surrounding the hollow portion at a constant conveyance speed. Thereby, the bonding thin film 5 can be formed over the entire area of the opening end face of the case member 2. Although the thickness of the bonding thin film 5 and the conveyance speed of the plasma nozzle 10 are arbitrary, the thickness of the bonding thin film 5 can be adjusted according to the conveyance speed of the plasma nozzle 10. For example, when the conveyance speed is set to 10 to 100 mm / sec, the thickness of the bonding thin film 5 can be set to 10 nm to 10 μm. For example, when the conveyance speed is set to 50 mm / sec, the thickness of the bonding thin film 5 is 180 nm. became.

  When the bonding thin film 5 is formed on the opening end surface of the case member 2 in this manner, a silicone adhesive (for example) is used as the sealing member 4 made of a thermosetting resin adhesive on the surface of the bonding thin film 5. For example, a two-component addition type silicone) is formed. The thickness of the seal member 4 is arbitrary, but for example, 0.75 mm. Then, the lid 3 is placed on and adhered to the seal member 4, and the seal member 4 is cured by heating at room temperature for 1 hour or more or by heating. For example, when the seal member 4 is a silicone adhesive, the seal member 4 can be cured by curing at room temperature for 2.5 hours or by heat curing at 110 ° C. for 1 hour. Thereby, the storage case 1 in which the case member 2 and the lid 3 are bonded via the seal member 4 is completed.

  As described above, the bonding thin film 5 is formed on the opening end surface of the case member 2 made of metal, and the seal member 4 and the case member 2 are bonded to each other through the bonding thin film 5. ing. In such a configuration, since the bonding thin film 5 and the case member 2 are firmly bonded, Cl ions and water molecules cannot reach between them. For this reason, it becomes possible to ensure the sealing structure of the storage case 1 even in a harsh environment where seawater (salt water), snow melting material, and rainwater adhere.

  As an experiment, the storage case 1 was immersed in normal-temperature salt water having a concentration of 5 wt% or more for 600 hours, or left in a high temperature and high humidity environment of 95% RH at 95 ° C. for 500 hours. However, in any case, the corrosion of the case member 2 and the decrease in the bonding strength between the case member 2 and the bonding thin film 5 and the seal member 4 were not confirmed. This also shows that the above effect is obtained.

(Other embodiments)
The present invention is not limited to the embodiment described above, and can be appropriately changed within the scope described in the claims.

  For example, the shape of the storage case 1 is not limited to the shape shown in the above embodiment, and the storage case 1 may have a sealing structure in which the case member 2 having a hollow portion and the lid portion 3 are bonded by the seal member 4. Any shape may be used.

  In the above embodiment, the case member 2 is made of metal and the lid 3 is made of resin. However, the present invention is applied to the case where at least one of the case member 2 and the lid 3 is made of metal. Can do. That is, the present invention can also be applied when the case member 2 is resin and the lid 3 is metal, or when both the case member 2 and the lid 3 are metal. In that case, the member made of metal and the bonding thin film 5 are firmly bonded by forming the bonding thin film 5 in advance on the surface of the member made of metal to which the seal member 4 is bonded. You should do it.

  In addition, as the bonding thin film 5, for example, a silicone-based thin film or a carbon-based thin film is given as an example, but this is also an example. That is, the bonding between the metal member and the sealing member 4 can be made stronger than the bonding between the metal member and the sealing member 4, and the sealing member 4 can also be bonded to the sealing member 4 than the metal and the sealing member 4. Other materials may be used as long as the material can strengthen the bonding. For example, a mixed film made of a silicone material or a carbon material may be used as the bonding thin film 5.

  Moreover, although the silicone adhesive (for example, 2 liquid addition type silicone) was mentioned as a material of the sealing member 4, for example, the other adhesives, for example, the adhesive consisting of 1 liquid or 2 liquids, can be used.

  Furthermore, although the case where the plasma nozzle 10 is used as an example of an apparatus for generating plasma has been described as an example, other plasma generation apparatuses may be used. Further, in the above embodiment, the plasma nozzle 10 is moved along the opening end surface of the case member 2, but the opening end surface of the case member 2 is aligned with the plasma nozzle 10 with the plasma nozzle 10 fixed at a predetermined position. May be moved once. That is, the bonding thin film 5 may be formed on the entire circumference of the circumference of the opening along the opening end surface of the case member 2 by moving the plasma nozzle 10 relative to the case member 2.

  In the above embodiment, only the storage case 1 is described, but various products such as electronic components and boards may be stored in the storage case 1 as a product. In that case, a structure may be employed in which a hole is formed in the case member 2 or the lid portion 3 and a connector or the like for electrical connection with the outside is exposed through the hole. Although the storage case 1 can be applied to various products, it is particularly preferable that the storage case 1 is applied to a product that is exposed to a harsh environment in which seawater (salt water), snow melting material, and rainwater adheres. Examples of such products include millimeter wave radars mounted on vehicles, ECUs (electronic control units) that control driving of headlamps such as LED lighting systems and HID lighting systems, and engine ECUs.

DESCRIPTION OF SYMBOLS 1 Storage case 2 Case member 3 Cover part 4 Seal member 5 Thin film for joining 10 Plasma nozzle

Claims (6)

A case member (2) formed of a bottomed cylindrical member having an internal hollow portion;
A lid (3) that covers the hollow portion of the case member;
A seal member (4) that is disposed between an opening end surface of the case member and the lid, and is configured by an adhesive that bonds the case member and the lid;
At least one of the case member and the lid is made of metal,
On the bonding surface between the case member and the lid part formed of a metal and the seal member, the metal and the seal member are more firmly bonded than the metal and the seal member, and the seal A storage case comprising a bonding thin film (5) for bonding to a member that is stronger than the bonding between the metal and the sealing member.   The storage case according to claim 1, wherein the bonding thin film is formed of a silicone-based thin film or a carbon-based thin film. A step of preparing a case member (2) composed of a bottomed cylindrical member whose inside is a hollow part;
Preparing a lid (3) that covers the hollow part of the case member;
A sealing member (4) composed of an adhesive is disposed between the opening end surface of the case member and the lid, and an adhesion step of bonding the case member and the lid with the seal member; A storage case manufacturing method comprising:
In the step of preparing the case member and the step of preparing the lid, at least one of the case member and the lid is made of metal,
As a pre-process of the bonding process, on the bonding surface of the case member and the lid made of metal and the sealing member, the plasma is more than the bonding of the metal and the sealing member. The step of coating the thin film for bonding (5) is performed in which the bonding with the metal becomes strong and the bonding with the sealing member becomes stronger than the bonding between the metal and the sealing member. Storage case manufacturing method.   The method for manufacturing a storage case according to claim 3, wherein in the step of coating the bonding thin film, the bonding thin film is formed of a thin film containing a silicone-based material or a carbon-based material.   In the step of coating the bonding thin film, a mixed gas obtained by mixing a gas containing one or more kinds of air, nitrogen, oxygen, argon and hydrogen and a silicon-containing gas, or one kind of air, nitrogen, oxygen, argon and hydrogen. The method for manufacturing a storage case according to claim 3, wherein the bonding thin film is formed of a silica thin film using the gas and the silicon-containing liquid.   The method for manufacturing a storage case according to any one of claims 3 to 5, wherein, in the bonding step, after the seal member is disposed, the seal member is cured by heating for 1 hour or more at room temperature or by heating. .

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