JP5925356B2 - Method for manufacturing waterproof electronic device - Google Patents

Description

  The present invention relates to a method for manufacturing a waterproof electronic device containing an electronic device.

  For example, as a conventional waterproof control unit for in-vehicle use, a connector housing fixed to a circuit board and a cover are separated from each other, and the end face of the connector housing provided on one side of the circuit board is looked out to the outside. A structure in which a circuit board is watertightly accommodated by a base that is a first part of a body, a cover that is a second part of a housing, and an end lid that is integrally formed with a connector housing and is a third part of the housing is known. is there. This type of waterproof control unit is suitable for standardization of the connector part compared to the type in which the connector housing and cover are integrally molded, but in addition to the waterproof seal structure between the cover and the base, the cover And a waterproof structure between the end cover and between the end cover and the base are required.

For example, as a conventional waterproof electronic device, a connector member having an external connection terminal connected to a circuit board, a back surface of the circuit board and a lower part of the outer peripheral seal portion of the connector member, and the external connection terminal are viewed outside. A base that constitutes the first part of the casing disposed so as to cover in a covered state, and a second part of the casing that is disposed so as to cover the surface of the circuit board and the remainder of the outer peripheral seal portion of the connector member The base and the outer peripheral part of the cover are directly opposed to each other and are watertight sealed, and the outer peripheral seal part of the connector member is watertightly sealed, and the first A second seal portion having two intersections with respect to the seal portion, and each of the watertight seals has a concave and convex surface formed by a concave groove portion and a convex portion formed on the opposing surface, respectively, with a sealant interposed therebetween. Adhesion is made by structure to engage is shown (for example, see Patent Document 1).
In addition, a technique is disclosed in which a sealing material is applied around the cell region of a liquid crystal display panel, and a gap between components is adhered with the sealing material (see, for example, Patent Document 2).

JP 2012-69611 A Japanese Patent No. 4854728

  For example, when the connector member and the housing are waterproof-sealed, it has been necessary to fill the combination of the connector members of the housing in advance with a sealing material. However, the assembly of the connector member causes the sealing material to be scraped out from the concave groove provided in the housing. For this reason, it has been difficult to ensure the sealing performance in the combination part of the casing parts. Further, it is necessary to manage the sealing material so that the sealing material is sufficiently filled even if the sealing material protrudes. Further, there is a problem that the sealing performance cannot be visually confirmed after the connector member is assembled to the housing.

  The present invention has been made to solve the above-described problems, and there is no scraping of the sealing material due to the assembly of the components, and the state of filling of the sealing material after the assembly of the components constituting the housing can be confirmed. An object of the present invention is to provide a method for manufacturing a waterproof electronic device.

  The waterproof electronic device manufacturing method according to the present invention includes a step in which a housing component is assembled to a housing body, and the housing body and the housing component cooperate to house the electronic device. The first fitting portion formed on the abutting surface of the body main body portion with the housing main body portion and the first fitting portion formed on the abutting surface of the housing main body portion with the housing main body portion. A step of pressure-injecting sealing resin into a gap between the second fitting parts fitted into the joint part and sucking air in the gap part; a housing lid part for sealing the electronic device Including a step of assembling to the housing body and the housing component.

  According to the waterproof electronic device manufacturing method of the present invention, the gap between the first fitting portion and the second fitting portion, which is formed on the abutting surface of the casing main body portion and the casing component portion, is formed. In addition, the step of injecting the sealing resin under pressure and sucking the air in the gap portion includes a step of sufficiently filling the gap portion with the sealing resin, and the end portion for sucking the air in the gap portion is made of resin. It can be used as a filling confirmation window.

It is a perspective view which shows the external appearance of the whole housing | casing of the waterproof type electronic device by Embodiment 1 of this invention. FIG. 3 is a perspective view of a casing main body portion of the waterproof electronic device according to the first embodiment. FIG. 3 is an enlarged plan view of a region A in FIG. FIG. 3 is an enlarged view of a region B of FIG. 3 is a perspective view of a connector member of the waterproof electronic device according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of the connector member of the waterproof electronic device according to the first embodiment. FIG. 3 is a perspective view illustrating a housing lid portion of the waterproof electronic device according to the first embodiment. FIG. 3 is a perspective view illustrating a state in which a connector member is assembled to the housing body of the waterproof electronic device according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a state in which a connector member is assembled to the housing main body of the waterproof electronic device according to the first embodiment. It is a schematic perspective view in case a sealing material is inject | poured into the assembly | attachment part of a connector member and a housing body part. FIG. 3 is a plan view showing the back side of the casing main body of the waterproof electronic device according to the first embodiment. 1 is a cross-sectional view of a main part of a waterproof electronic device according to a first embodiment. It is a schematic perspective view in the case of inject | pouring a sealing material into the assembly | attachment part of the connector member and housing | casing main-body part of the waterproof electronic device by Embodiment 2 of this invention. It is a perspective view of the housing | casing main-body part of the waterproof electronic device by Embodiment 3 of this invention. FIG. 10 is a main-portion cross-sectional view of a housing main body portion of a waterproof electronic device according to a third embodiment.

Embodiment 1 FIG.
A waterproof electronic device according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a waterproof electronic device 100, which is a control unit, includes an aluminum die-cast housing main body 1 and an electronic device (see FIG. 1) mounted on the upper surface side of a flat portion 1a inside the housing main body 1. Not shown) and the opening of the side surface portion 1b rising from the flat surface portion 1a of the housing main body portion 1 are sealed, and the cylindrical side surface portion is formed in cooperation with the side surface portion 1b to surround the electronic device and has an external connection terminal. It is assembled to the same surface (upper surface) on the opening side of the cylindrical side surface portion constituted by the connector member 2 (corresponding to the housing constituent portion), the side surface portion 1b of the housing main body portion 1 and the connector member 2, It is mainly configured by a casing lid portion 3 that seals a space inside the casing on which the electronic device is mounted. That is, the casing of the waterproof electronic device 100 includes the casing main body 1, the connector member (housing component) 2, and the casing lid 3. The flat surface portion (bottom surface portion) 1a and the side surface portion 1b of the housing main body 1 have an integral structure.

As shown in a perspective view of the housing main body 1 of the waterproof electronic device 100 in FIG. 2, a concave first fitting is formed on the abutment surface of the opening in which the connector member 2 of the housing main body 1 is assembled. Groove portions 4a and 4b are provided as joint portions. A concave groove 4a is formed on the tapered surface of the end portion of the side surface 1b of the housing body 1, and a concave groove 4b is formed on the abutting surface of the flat surface 1a. Since these groove portions 4a and 4b which are the first fitting portions are parts assembled to the convex second fitting portion of the connector member 2, the convex portions which are the second fitting portions on the connector member 2 side. It is formed so as to have a butt surface having the same outer shape as the shape portion.
Moreover, the hole 4c which reaches | attains the back surface side of the plane part 1a is formed in the center part of the concave groove part 4b of the plane part 1a. The hole 4c serves as a suction port for sucking air in the filling space when resin is poured into the grooves 4a and 4b, and also serves as a confirmation window for confirming resin filling.
A convex shaped portion 4 d for fitting the case lid 3 is formed at the upper end of the side face 1 b of the case body 1.

  FIG. 3 is an enlarged plan view of region A in FIG. 2, and is a diagram illustrating a plan view of a main part of the connector member 2 assembly portion of the housing main body 1 according to the first embodiment. As shown in FIG. 3, the opening of the housing body 1 has concave grooves 4 a and 4 b for assembling the connector member 2, and a central portion of the inclined butted surface 5 a of the side 1 b. The groove portion 4a is formed on the flat surface portion 1a. When the substantially cylindrical cylindrical side surface portion is constituted by the side surface portion 1b and the connector member 2, the groove portion 4b formed in the flat surface portion 1a is formed to have an arc shape.

  FIG. 4 is an enlarged view of region B in FIG. 2, and shows a perspective view of the main part of the connector member 2 assembly portion of the housing body portion 1 according to the first embodiment. The abutting surface portion 5a of the side surface portion 1b is formed in a taper shape, and the opening portion of the housing body portion 1 extends from the upper end side to the lower end side (the mounting surface of the electronic device). The opening width is inclined toward the upper surface of the flat portion 1a).

FIG. 5 is a perspective view of the connector member 2 of the waterproof electronic device 100, and FIG. 6 is a cross-sectional view of the connector member 2. The connector member 2 is a butted surface portion assembled to the side surface portion 1b of the housing body 1. (The left-right direction in FIG. 5) is formed in a tapered shape, and has a convex portion 6a that fits into the groove portion 4a on the housing body 1 side. Further, a convex shape portion 6b to be assembled to the housing lid portion 3 is formed on the upper side of the connector member 2, and a convex shape portion 6c to be assembled to the flat portion 1a of the housing main body portion 1 is formed on the lower side of the connector member 2, respectively. Has been. The surface portion on which the convex portions 6 a, 6 b, and 6 c are formed is a butting surface that is assembled to the housing body 1 or the housing lid 3.
The connector member 2 is provided with a sufficiently flexible part (not shown) such as silicon rubber on the outer peripheral part of the convex parts 6a and 6c. When the connector member 2 is assembled, the gap between the contact surfaces (butting surfaces) is completely sealed.

  Next, as shown in FIG. 7, a perspective view of the housing lid 3 viewed from the inside of the housing, the housing lid 3 is a combination of the side surface portion 1 b of the housing body 1 and the connector member 2. A concave groove portion 7a for fitting convex portions 4d and 6b, which are convex fitting portions at the upper end of the cylindrical side surface portion, is provided on the abutting surface on the upper end side of the cylindrical side surface portion. Have.

FIG. 8 is a perspective view showing a state in which the connector member 2 is assembled to the opening of the housing main body 1 of the waterproof electronic device 100. The electronic device mounted on the flat surface portion 1a of the housing main body portion 1 is surrounded by a cylindrical side surface portion (consisting of the side surface portion 1b and the connector member 2) rising from the flat surface portion 1a.
And in the state which assembled | attached the connector member 2 to the housing | casing main-body part 1, the gap | interval part mentioned later is formed in a butt | matching surface. Sealing resin is injected under pressure into the gap, but injection ports 8a and 8b for injecting the sealing resin are constituted by the end of the gap.

  FIG. 9 shows a cross-sectional view of the state in which the connector member 2 is assembled to the housing main body 1, and the concave groove 4 b formed in the flat surface 1 a of the housing main body 1 projects into the convex portion of the connector member 2. In a state where the shape portion 6c is fitted, for example, two positions are fixed with screws (not shown). At this time, on the abutting surface where the groove 4a and the convex portion 6c are fitted, the convex portion 6c does not contact the inner wall of the groove 4b, and gap portions 9a, 9b, 9c into which the sealing resin is injected are formed. Is done. Here, the gap 9a in the concave groove 4b is a gap on the inner peripheral side than the convex part 6c, the gap 9b is a gap on the outer peripheral side than the convex part 6c, and the gap 9c is a convex part 6c. The gaps on the lower part side are shown. Thus, adhesiveness can be improved by earning the adhesion area of a butting surface and sealing resin.

Further, a hole 4c serving as a suction port to be described later is opened at the center of the groove 4b so as to reach the groove 4b from the back surface side of the flat surface 1a. A similar gap is also formed in the groove 4a formed in the side surface 1b, and is continuous with the gaps 9a, 9b, 9c on the flat surface 1a side.
Further, the gap between the housing body 1 and the connector member 2 is hermetically sealed by a sufficiently flexible part (not shown) such as silicon rubber that covers the outer periphery of the convex portion of the connector member 2.

  Next, FIG. 10 shows a schematic perspective view in the case of injecting a sealing resin (seal material) into the assembly portion of the connector member 2 and the housing body 1. FIG. 11 is a plan view of the back surface side of the flat surface portion 1 a of the housing body 1. As shown in FIG. 10, jigs 10 a are respectively disposed at the inlets 8 a and 8 b that are the ends of the gaps formed on the abutting surfaces of the casing components. The jig 10a is made of a flexible and strong material such as a urethane material at the tip of the sealing resin injector, and the jig 10a is pressed against the contact surface around the injection ports 8a and 8b. By adhering to each other, leakage of the sealing resin to the outside due to pressure escape during resin injection is prevented.

Sealing resin is pressurized and injected simultaneously from two locations through the injection ports 8a and 8b (both ends of the continuous gap). Simultaneously with this resin injection, the hole 4c ( The air in the gaps 9a, 9b, 9c is sucked by the suction equipment using the suction port as a suction hole) connected to the central part of the streaky gap. By sucking air from the hole 4c, the gaps around the grooves 4a and 4b of the housing body 1 and the convex portions 6a and 6c of the connector member 2 are in a negative pressure state, and a viscous liquid sealing resin Is filled with the first seal portion.
Here, when the sealing resin reaches the hole 4c, the filling of the sealing resin into the gaps 9a, 9b, and 9c can be confirmed. That is, the hole 4c serves as a confirmation window for confirming resin filling.

  As shown in a cross-sectional view of the main part of the waterproof electronic device 100 in FIG. 12, the opening surface portion serving as the upper end portion of the cylindrical side surface portion of the housing main body 1 and the connector member 2 on which the electronic device is mounted is provided on the housing. A state in which the body lid portion 3 is covered and the electronic device is sealed can be obtained. Here, the convex-shaped part 4d of the housing body 1 and the convex-shaped part 6b of the connector member 2 are combined to form an annular convex-shaped part. This annular convex portion fits into an annular groove 7a provided on the back side of the housing lid portion 3, but in a state where the housing lid portion 3 is assembled, between the groove portion 7a and the convex portion 6b. The gap portions 9d, 9e, and 9f formed in are filled with a sealing resin (not shown). The gap portion 9d is a gap on the inner peripheral side of the convex shape portion 6b, the gap portion 9e is a gap on the outer peripheral side of the convex shape portion 6b, and the gap portion 9f is a gap on the upper side of the convex shape portion 6b. Is shown.

When assembling the case lid 3, first, a sealing resin is applied to the abutting surface (uneven surface) including the convex portions 4d and 6b formed on the upper ends of the case body 1 and the connector member 2. Similarly, the sealing resin is also applied to the abutting surface portion (uneven surface) including the groove portion 7 a of the housing lid portion 3. Thereafter, the opposing butted surface portions are overlapped and assembled so that the convex portions and the concave portions engage with each other, and the gap portions 9d, 9e, and 9f are filled with sealing resin to form the second seal portion. The
As described above, a unit having a waterproof function can be obtained in which the joint surfaces between the components of the waterproof electronic device 100 are watertightly sealed by the first seal portion and the second seal portion.

  As described above, the waterproof electronic device 100 according to the first embodiment of the present invention is assembled to the housing main body 1 and the housing main body 1, and the electronic device is cooperated with the housing main body 1. A housing member 3 that is housed and electrically connected to the electronic device (a housing component), a housing body 1 and a connector member 2 to seal the electronic device, and a housing body Grooves 4a and 4b (first fitting portions) formed on the abutting surface of the part 1 with the connector member 2, and the first fitting portion formed on the abutting surface of the connector member 2 with the housing body 1 Convex-shaped portions 6a and 6c (second fitting portions) that fit into the first fitting portion and a sealing resin injected into a gap portion formed between the first fitting portion and the second fitting portion. Structure. And the hole 4c which reaches | attains a clearance gap is formed in the housing body part 1 (or connector member 2) as a suction port.

  In the method for manufacturing the waterproof electronic device 100, the connector body 2 is assembled to the housing body 1, and the housing body 1 and the connector member 2 cooperate to house the electronic device. The groove portions 4a and 4b (first fitting portion) formed on the butting surface with the connector member 2 and the housing body portion 1 of the connector member 2 are formed on the butting surface, A step of pressure-injecting sealing resin into the gap between the convex portions 6a and 6c (second fitting portion) to be fitted and sucking air in the gap, and a housing for sealing the electronic device A step of assembling the body lid portion 3 to the housing body portion 1 and the connector member 2 is included.

  According to the waterproof electronic device 100 and the method for manufacturing the same according to the first embodiment, in the fitting portion between the housing body 1 and the connector member 2, after the housing body 1 and the connector member 2 are abutted, The gap is filled with resin. Therefore, since it is not a structure in which the projection of the other fitting portion is fitted after the sealing resin is filled in the groove of one fitting portion as in the prior art, there is no scraping of the sealing resin, and a sufficient amount The sealing resin can be filled. Moreover, since the filling condition of sealing resin can be grasped | ascertained by visually confirming the sealing resin which reached | attained the hole 4c from the outside, a sealing performance and workability | operativity can be improved.

In addition, although the hole part 4c showed the example formed in the housing | casing main-body part 1 side, the suction port which attracts | sucks the air of the clearance gap formed in the abutting surface between housing | casing components, and resin filling are confirmed. Needless to say, it may be formed on the connector member 2 side as long as it can be used as a confirmation window.
In the above example, the first fitting portion provided in the housing main body 1 is a concave groove portion, and the second fitting portion provided in the connector member 2 is a convex shape portion. The first fitting portion provided on the body main body 1 may be a convex portion, and the second fitting portion provided on the connector member 2 may be a concave groove.

Embodiment 2. FIG.
A waterproof electronic device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 13 is a schematic perspective view when a sealing resin (seal material) is injected into the assembly portion of the connector member 2 and the housing main body 1 of the waterproof electronic device 100. In the above-described first embodiment, both ends of the gap portion of the butting surface of the housing body 1 and the connector member 2 are the sealing resin injection ports 8a and 8b, and simultaneously from these two injection ports 8a and 8b, Although an example in which the sealing resin is injected toward the hole 4c side has been shown, here, the hole 4c is not formed, and one of the injection ports 8b is used as a suction port for sucking air in the gap portion. explain.

  In the second embodiment, as shown in FIG. 13, one end of the continuous gap formed on the abutting surface of the housing main body 1 and the connector member 2 is a sealing resin inlet, and a jig Sealing resin is injected under pressure in the direction of the arrow through 11a. The other end of the gap is a suction port for sucking the air in the gap, and the air in the gap is sucked in the direction of the arrow through the jig 11b to assist the injection of the sealing resin into the gap. . Then, the other end of the gap is used as a confirmation window with the jig 11b removed, and when the sealing resin is visible in the confirmation window, it is confirmed that the gap is filled with the sealing resin. .

  In this way, one end of the continuous gap portion formed on the abutting surface of the housing body 1 and the connector member 2 is a sealing resin injection port, and the other end is a suction port and a resin that creates a negative pressure in the gap portion. By using it as a confirmation window for filling, it is possible to reduce the processing cost of adding the suction port and the hole 4c to be the confirmation window to the housing body 1 and to reduce the facility for injecting the sealing resin. Can be reduced. Similarly to the first embodiment described above, the first sealing portion, which is the fitting portion between the housing body 1 and the connector member 2, does not scrape the sealing resin, and other than the gap portion serving as the suction port. By visually confirming the sealing resin that has reached the end from the outside, the filling state of the sealing resin can be grasped, so that the sealing performance and workability can be improved. Note that the second sealing portion, which is a fitting portion between the housing lid portion 3 and other housing components, is the same sealing method as described above, and the waterproof electronic device 100 according to the second embodiment is the same as the second embodiment. 1 can be obtained.

Embodiment 3 FIG.
A waterproof electronic device according to a third embodiment of the present invention will be described with reference to FIGS. 14 is a perspective view of the housing main body 1 of the waterproof electronic device 100, and FIG. 15 is a cross-sectional view of the main part centering on the butting surface of the flat surface 1a of the housing main body 1. Grooves 13a and 13b that are shallower than the grooves 4a and 4b, which are the first fitting parts, are provided on both sides of the concave grooves 4a and 4b of the casing body 1, that is, on the radially outer side and the inner side of the groove 4a. ing. The groove portions 13 a and 13 b are grooves that are dug shallower than the groove portion 4 b from the upper surface of the flat surface portion 1 a of the housing main body portion 1. The groove portions 13a and 13b are provided with cured resin materials 14a and 14b in which the sealing resin is cured in advance before the connector member 2 is abutted. By assembling the connector member 2 to the opening of the casing body 1 in a state where the sealing resin applied to the concave grooves 13a and 13b of the casing body 1 is cured to be cured resin materials 14a and 14b. Thus, it becomes possible to completely seal the gap between the parts of the housing body 1 and the connector member 2.

  As described above, by disposing the cured resin materials 14a and 14b in the grooves 13a and 13b, an O-ring or a sealing material (liquid packing, gasket) is provided on the outer peripheral portion of the convex portions 6a, 6b, and 6c of the connector member 2. It is unnecessary to dispose a part such as flexible silicon rubber such as), and the direct material cost (material cost and cost necessary for production) of the part can be reduced.

  In addition, in the manufacturing process of the waterproof electronic device 100 according to the third embodiment, the sealing resin is injected into the gap formed in the abutting surface of the housing main body 1 and the connector member 2 as described in the above embodiment. 1, using a suction port that is a hole 4 c opened in the flat surface 1 a of the housing body 1, the sealing resin is pressurized and injected from the injection ports 8 a and 8 b at both ends of the gap. A method of sucking air in the gap from the portion 4c can be used. Further, as shown in the second embodiment, without using the hole 4c, one end of a continuous gap formed on the abutting surface of the housing main body 1 and the connector member 2 is used as an injection port for sealing resin. Needless to say, the method of using the other end as an air suction port in the gap can be applied to the third embodiment.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 Housing | casing main-body part, 1a Plane part, 1b Side surface part, 2 Connector member, 3 Housing | casing cover part, 4a, 4b, 7a, 13a, 13b Groove part, 4c Hole part, 4d, 6a, 6b, 6c Convex-shaped part, 5a butt surface portion, 8a, 8b inlet, 9a, 9b, 9c, 9d, 9e, 9f gap portion, 10a, 11a, 11b jig, 14a, 14b cured resin material, 100 waterproof electronic device.

Claims (5)

  A case in which a housing component is assembled to the housing main body, and the housing main body and the housing component cooperate to store the electronic device; a surface where the housing main body meets the housing component Between the second fitting portion formed on the abutting surface between the first fitting portion formed on the housing and the housing main body portion of the case constituting portion and fitting on the first fitting portion. A step of injecting a sealing resin into the gap of the pressure and sucking air in the gap and assembling a casing lid for sealing the electronic device to the casing body and the casing component A method for manufacturing a waterproof electronic device, comprising: a step.   The sealing resin is pressurized and injected from the end of the gap, and the air in the gap is opened in the casing body or the casing component so as to reach the gap. The method for manufacturing a waterproof electronic device according to claim 1, wherein the suction type electronic device is sucked from a vacuum.   3. The method of manufacturing a waterproof electronic device according to claim 2, wherein the hole portion is confirmed to be filled with the sealing resin in the gap portion.   2. The method of manufacturing a waterproof electronic device according to claim 1, wherein the sealing resin is pressurized and injected from one end of the gap, and the air in the gap is sucked from the other end of the gap. 5. The method of manufacturing a waterproof electronic device according to claim 4, wherein it is confirmed at the other end of the gap that the gap is filled with the sealing resin.

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