JP6022891B2 - Film-integrated waterproof packing - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film-integrated waterproof packing that is inserted between case members constituting a casing of an electronic device, thereby sealing between the case members and preventing entry of water droplets, dust, and the like into the electronic device. .

  With respect to portable electronic devices such as mobile phones, portable audio players, digital cameras, digital video cameras, etc., the usage environment has become widespread with the addition of many functions, and the usage needs in daily life and leisure applications have increased. Therefore, the waterproof performance of portable electronic devices has come to be regarded as important.

In order to make an electronic device waterproof, for example, there is a technique of inserting a rubber O-ring between a container for internal parts and a lid (a pair of case members). However, the rubber O-ring has a problem that its shape is not stable during handling, and it is difficult to fit into the casing due to the influence of elongation.
In recent years, waterproof packing is not just a ring shape, but a precise design that matches the shape of the housing is required. However, a waterproof packing made of a single rubber is flexible and can be maintained. Since it is low, not only the handleability in the fitting operation into the housing is bad, but there is also a problem with respect to deterioration of dimensional accuracy due to elongation. In contrast to such a technique, for example, a technique that improves the handleability of a seal member by integrating a resin film with a rubber member, such as the technique described in Japanese Patent Application Laid-Open No. 2010-080910 (Patent Document 1). ing.

JP 2010-080910 A

According to the technology described in Japanese Patent Application Laid-Open No. 2010-080910 (Patent Document 1), a small electronic device is required to reduce the area of the sealing member. And a portion integrated with each other are required separately from the portion to be compressed, and the area occupied by the seal member is large.
Further, when the portion where the rubber member and the resin film are integrated is compressed, the problem described in the above-mentioned Japanese Patent Application Laid-Open No. 2010-080910 (Patent Document 1), that is, the reaction force (compression stress) is increased. There was an inconvenience.

  On the other hand, if a thin resin film is used to reduce the compressive load while reducing the area occupied by the seal member, the shrinkage of the rubber member due to curing shrinkage or the difference in linear expansion coefficient between the rubber member and the resin film can be reduced. New issues such as outbreaks occurred. In a film-integrated waterproof packing that requires a precise design that matches the shape of the housing, if warping is involved, the dimensional accuracy in the height direction will be significantly reduced.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a film-integrated waterproof packing that is thin and has a small area, is easy to handle, does not easily warp, and has a low compressive stress.

  In order to achieve the above object, a waterproof packing for sealing a gap between case members inserted between a pair of case members constituting a casing of an electronic device, a flexible member made of a rubber-like elastic body and a resin film The flexible member has two abutting portions, a first abutting portion that abuts against one case member and a second abutting portion that abuts against the other case member. The member is a series of resin films having a horizontal portion that intersects the compression direction inside the flexible member and a wall portion that rises in the compression direction and has a thickness of 35 μm to 100 μm. Provide waterproof packing.

  A waterproof packing that is inserted between a pair of case members constituting a housing of an electronic device and seals a gap between the case members includes a flexible member made of a rubber-like elastic body and a reinforcing member made of a resin film. The flexible member has two contact portions, a first contact portion that contacts one case member and a second contact portion that contacts the other case member. The reinforcing member is located inside the flexible member. Therefore, it has a cross-sectional shape in which the entire outer surface is pressed. Therefore, like a so-called O-ring, a film-integrated waterproof packing having a minimum necessary cross-sectional shape, a narrow width, and a small area can be obtained.

Since the reinforcing member has a horizontal portion that intersects the compression direction and a wall portion that rises in the compression direction, the horizontal portion can suppress horizontal deformation and the wall portion can suppress vertical deformation. Therefore, warpage can be effectively reduced. In addition, it has good dimensional accuracy and is easy to handle.
In particular, by providing the wall portion in the contact portion where the thickness is likely to increase, the warpage can be effectively suppressed even if the stress that causes the warpage due to the thickness increases. Thus, the dimensional accuracy in the height direction can be remarkably improved. Furthermore, since the wall portion is provided inside the contact portion, it is not necessary to increase the thickness more than necessary, and a thin film-integrated waterproof packing can be obtained.

By forming the thickness of the reinforcing member as thin as 35 μm to 100 μm, the thickness of the entire film-integrated waterproof packing derived from the thickness of the reinforcing member is slightly increased, and the increase in the compressive load can be reduced. Furthermore, the thickness of the whole film-integrated waterproof packing can be further reduced by making the reinforcing member less than 70 μm. In addition, in the film-integrated waterproof packing having a convex reinforcing member, the fold angle can be easily changed. Therefore, the compressive load can be further reduced particularly by the film-integrated waterproof packing having the reinforcing member having a convex cross-sectional shape. Moreover, since the one where the thickness of a resin film is thinner becomes easy, dimensional accuracy can be improved.
Since the reinforcing member is provided inside the flexible member, in other words, since the reinforcing member does not protrude from the flexible member, there is little increase in the area of the seal member even if the reinforcing member is provided. The area can be made substantially the same as that of the waterproof packing without any gap.

  The reinforcing member can be provided with a chevron portion having a top portion connecting the two wall portions. By providing the reinforcing member with a chevron portion having a top portion that connects two wall portions, the chevron portion is subject to the direction in which the angle of the fold changes, that is, the vertical deformation and the horizontal deformation shown in FIG. can do. Therefore, while exhibiting the improvement of the formability by providing the reinforcing member, the deformability in the compression direction can be improved and the compression load can be lowered.

  The end of the horizontal portion of the reinforcing member can be exposed to the outside. Since the end of the horizontal portion is exposed to the outside, the film-integrated waterproof packing can be obtained by cutting unnecessary portions of the reinforcing member after forming the reinforcing member and the flexible member. Therefore, it is possible to provide a film-integrated waterproof packing that is easy to manufacture.

  The flexible member may have a continuous portion that continues from the front side to the back side of the resin film. Since the flexible member is provided with the continuous portion that continues from the front side to the back side of the resin film, the first contact portion and the second contact portion can be formed from a continuous rubber-like elastic body. Therefore, there is no possibility that the flexible member is divided into the first contact portion and the second contact portion with the reinforcing member as a boundary, and the durability of the film-integrated waterproof packing can be enhanced. Moreover, since the outer shape of the film-integrated waterproof packing can be maintained even if a part of the boundary surface between the flexible member and the reinforcing member is peeled off, the sealing function can be maintained and the reliability can be improved. . Furthermore, the entire flexible member can be molded by a single molding.

  It is possible to provide a film-integrated waterproof packing in which the longitudinal cross-sectional shape of at least one contact portion is convex. Since the longitudinal cross-sectional shape of at least one contact portion is a convex shape, the sealing performance can be improved by abutting and crushing the convex portion against the case member.

  A film-integrated waterproof packing in which the longitudinal cross-sectional shape of at least one contact portion is a concave shape can be obtained. Since the longitudinal section of at least one contact portion is concave, the compressive load can be reduced by forming a concave portion in the gap when contacting the case member.

  The film-integrated waterproof packing can be annular. In the case of the annular film-integrated waterproof packing, particularly when the dimensional accuracy in the length direction is poor, it is difficult to mount the case member in the groove. However, since the film-integrated waterproof packing of the present invention includes a predetermined reinforcing member, it can be a film-integrated waterproof packing that is particularly excellent in dimensional accuracy in the length direction, and can be reliably attached to a predetermined portion of the case member. Can be installed on.

  According to the film-integrated waterproof packing of the present invention, the handleability is good, the warp is small, and the compressive load is low, although the area is small.

It is a disassembled perspective view which shows a mode that the film-integrated waterproof packing of 1st Embodiment is pinched | interposed into a housing | casing. It is sectional drawing of the film-integrated waterproof packing of 1st Embodiment by the SA-SA line cross section of FIG. It is explanatory drawing which shows a mode that the film-integrated waterproof packing of FIG. 2 is fitted in a pair of case members. It is explanatory drawing which shows the state after inserting the film-integrated waterproof packing of FIG. 2 in a pair of case members. It is explanatory drawing explaining the state before and behind the press with respect to the film-integrated waterproof packing of FIG. It is explanatory drawing explaining the state before and behind the press with respect to the conventional film-integrated waterproof packing. FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing that is Modification 1. FIG. 9 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing that is Modification 2. FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing according to a second embodiment. FIG. 5 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing according to a third embodiment. FIG. 9 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing that is Modification 3. FIG. 6 is a cross-sectional view corresponding to FIG. 2 of a film-integrated waterproof packing according to a fourth embodiment.

  The present invention will be described in more detail based on embodiments. Components common to the following embodiments are denoted by the same reference numerals, and redundant description is omitted. In addition, overlapping descriptions of common materials, manufacturing methods, effects, and the like are omitted.

First Embodiment [FIGS. 1 to 5] :
As shown in FIG. 1, the film-integrated waterproof packing 11 is used by being sandwiched between two case members 2 and 3 of a case member 2 and a case member 3 constituting a case 1 of a portable electronic device. 1 is a sealing member that keeps the inside of 1 liquid-tight. More specifically, a groove 2a and a groove 3a are formed in the case member 2 and the case member 3, respectively, and the groove is used by being inserted between the groove 2a and the groove 3a.

The film-integrated waterproof packing 11 according to this embodiment is shown in a partial cross-sectional view in FIG. 2, and includes a reinforcing member 13 made of a resin film and a flexible member 12 provided on the front and back of the reinforcing member 13. .
And the flexible member 12 has two contact parts 12a and 12b, the 1st contact part 12a contact | abutted to one case member, and the 2nd contact part 12b contact | abutted to the other case member. In addition, the reinforcing member 13 has a horizontal portion 13c inside the flexible member 12 that intersects the compression direction, a wall portion 13d that rises in the compression direction, and a top portion 13e that connects the two wall portions 13d. The two wall portions 13d and 13d and the top portion 13e form a chevron.

The first contact portion 12a is a portion that fits into the groove 2a of the case member 2 (or the groove 3a of the case member 3), and is a portion that is compressed by receiving pressure. The second contact portion 12b is a portion that fits into the groove 3a of the case member 3 (or the groove 2a of the case member 2), and is also a portion that is compressed by being pressed.
In the present embodiment, both the first contact portion 12a and the second contact portion 12b have a convex longitudinal cross-sectional shape and are easily fitted in the grooves 2a and 3a.
And the 1st contact part 12a and the 2nd contact part 12b are divided | segmented up and down across the reinforcement member 13. As shown in FIG.

  The material of the flexible member 12 is a rubber-like elastic body, for example, silicone rubber, natural rubber, isoprene rubber, butadiene rubber, acrylonitrile butadiene rubber, 1,2-polybutadiene, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber. , Ethylene-propylene rubber, chloroslyphone rubber, polyethylene rubber, acrylic rubber, epichlorohydrin rubber, fluorine rubber, urethane rubber, for example, styrene thermoplastic elastomer, olefin thermoplastic elastomer, ester thermoplastic elastomer, urethane heat And thermoplastic elastomers such as plastic elastomers, amide thermoplastic elastomers, vinyl chloride thermoplastic elastomers, fluorinated thermoplastic elastomers, and ionically crosslinked thermoplastic elastomers. . Silicone rubber is one of the preferred materials from the viewpoints of moldability, weather resistance, compression set, and the like.

  The horizontal portion 13c of the reinforcing member 13 intersects the compression direction and can suppress deformation in the horizontal direction. Further, the wall portion 13d rises in the compression direction and can suppress deformation in the vertical direction. And since it has such a horizontal part 13c and wall part 13d together, curvature can be prevented effectively.

The reinforcing member 13 is made of a series of resin films, and for example, polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyethylene naphthalate, polyimide, polymethyl methacrylate, etc. can be used.
The reinforcing member 13 has a thickness of 35 μm to 100 μm. If the thickness is less than 35 μm, the rigidity is so weak that it easily bends, and therefore the handleability of the film-integrated waterproof packing 11 cannot be improved. On the other hand, if the thickness of the reinforcing member 13 exceeds 100 μm, the thickness of the film-integrated waterproof packing 11 increases and it is difficult to achieve a reduction in thickness. Moreover, it is preferable that the thickness is less than 70 micrometers. By setting the thickness to less than 70 μm, the thickness of the entire film-integrated waterproof packing 11 can be further reduced, and the compressive load can be further reduced. Further, the molding becomes easy and the dimensional accuracy can be increased.

The flexible member 12 and the reinforcing member 13 can be easily integrated with an adhesive, a primer, or the like. The flexible member 12 may be integrated with the reinforcing member 13 by self-adhesiveness, or the reinforcing member 13 is inserted into a mold for forming the flexible member 12 so that the reinforcing member 13 is integrally formed with the flexible member 12. You may do it.
When the flexible member 12 and the reinforcing member 13 are integrally formed, it is preferable to use a resin film having excellent heat resistance such as polyimide, polyethylene naphthalate, polyethylene terephthalate, and polybutylene terephthalate.

  As shown in FIG. 3, the thickness of the film-integrated waterproof packing 11 (length in the vertical direction H) is formed to be thicker than the total thickness of the groove 2 a of the case member 2 and the groove 3 a of the case member 3. . On the other hand, the width of the film-integrated waterproof packing 11 (the length in the left-right direction W) is narrower than the width of the groove 2a or the groove 3a. With this structure, when the case member 2 is overlaid on the case member 3, as shown in FIG. 4, the film-integrated waterproof packing 11 is in the height direction (vertical direction) H between the groove 2a and the groove 3a. The case member 2 and the case member 3 are sealed by being compressed and spread in the width direction W.

5 and 6 schematically show the state before and after the film-integrated waterproof packing 11 and the conventional film-integrated waterproof packing 4 are compressed.
In the state PP before compression, the film-integrated waterproof packing 11 has the wall portions 13d and 13d facing each other upright substantially vertically as shown by the broken line in FIG. In the state AP, as shown by a solid line in FIG. 5, the wall portions 13 d and 13 d of the reinforcing member 13 are expanded to the left and right, and the entire film-integrated waterproof packing 11 is compressed together with the flexible member 12 to expand in the width direction W.
On the other hand, regarding the conventional film-integrated waterproof packing 4, the state PP before compression is indicated by the wavy line in FIG. 6 and the state AP after compression is indicated by the solid line in FIG. The shape does not change, and only the first contact portion 13a and the second contact portion 12b, which are the flexible members 12, are deformed so as to spread left and right.

As described above, in the film-integrated waterproof packing 11, since the flexible member 12 and the reinforcing member 13 are deformed so as to spread together, the stress that suppresses the deformation of the flexible member 12 by the reinforcing member 13 is small, and the compressive load is reduced. Can do. On the other hand, in the conventional film-integrated waterproof packing 4, the reinforcing member 13 suppresses the deformation of the flexible member 12, so that the compressive load increases.
In FIGS. 5 and 6, hatching indicating a cross section is omitted in order to easily show the state before and after compression.

  7 to 12 show modified examples (including modified embodiments) of the film-integrated waterproof packing 11.

Modification 1 [FIG. 7] :
In FIG. 7, the film-integrated waterproof packing 11a of Modification 1 is shown.
The film-integrated waterproof packing 11a is different from the film-integrated waterproof packing 11 shown in the previous embodiment in the cross-sectional shapes of the first contact portion 12a and the second contact portion 12b. That is, in the film-integrated waterproof packing 11a, the tips of the first contact portion 12a and the second contact portion 12b are sharper and have a flat surface. Thus, the shape of the contact portion can be appropriately changed according to the shape of the groove of the case member into which the film-integrated waterproof packing is fitted.

Modification 2 [FIG. 8] :
In FIG. 8, the film-integrated waterproof packing 11b of Modification 2 is shown.
The film-integrated waterproof packing 11b also has a different cross-sectional shape of the second abutting portion 12b. The film-integrated waterproof packing 11b has two protrusions 12b1 and 12b2, and has a concave cross section. Since the two protrusions 12b1 and 12b2 are provided on the second contact portion 12b and there is a gap between them, the compression load can be reduced.
Further, when a convex portion is formed in the groove 3a of the case member 3, the convex portion is fitted between the two projecting portions 12b1 and 12b2, so that the second contact portion 12b is more densely arranged in the groove 3a. Can be fitted. Thus, the shape of the second contact portion can be changed as appropriate in accordance with the shape of the groove 3a. Changing the shape appropriately is the same for the first contact portion 12a.

Second Embodiment [FIG. 9] :
FIG. 9 shows a film-integrated waterproof packing 21 according to the second embodiment.
Unlike the film-integrated waterproof packing 11 shown in the previous embodiment, the film-integrated waterproof packing 21 has one horizontal portion 13c and a wall portion 13d, and does not have a top portion. .
Even in such a film-integrated waterproof packing 21, since the reinforcing member 13 has the horizontal portion 13c and the wall portion 13d, it is easy to handle and hardly warps.
In FIG. 9, the wall portion 13 d rises upward, but may be a wall portion 13 d that extends downward.

Third Embodiment [FIG. 10] :
FIG. 10 shows a film-integrated waterproof packing 31 according to the third embodiment.
The film-integrated waterproof packing 31 is different in that the reinforcing member 13 has one horizontal portion 13c and a wall portion 13d extending downward from the horizontal portion 13c.
Since it has the wall part 13d extended even to the 2nd contact part 12b side, the compressive load of an up-down direction can be heightened and it cannot be crushed up and down easily.

Modification 3 [FIG. 11] :
FIG. 11 shows a film-integrated waterproof packing 31a of Modification 3.
In the film-integrated waterproof packing 31a, the reinforcing member 13 has two top portions 12e and 12e. The two top portions 12e and 12e extend to the first contact portion 12a side and the second contact portion 12b side, respectively, and enhance the reinforcing effect and the effect of preventing warpage.

Fourth Embodiment [FIG. 12] :
FIG. 12 shows a film-integrated waterproof packing 41 of the fourth embodiment.
In the film-integrated waterproof packing 41, the surface of the reinforcing member 13 is exposed from the surface of the flexible member 12 in the concave portion of one abutting portion in addition to the end surface 13f that is the end of the horizontal portion 13c of the reinforcing member 13 being exposed to the outside. The difference is that it has an exposed portion 13g.
If a convex portion is formed in the groove 3a of the case member 3, if there is an exposed portion 13g, the exposed portion 13g is fitted into the convex portion. Therefore, compared with the case where the flexible member 12 and the convex part are fitted without the exposed part 13g, it is difficult to cause a catch or the like and is easy to fit. Therefore, the ease of insertion into the case member 3 is improved by having the exposed portion 13g. As described above, when the groove 3a has fine unevenness, the ease of fitting can be improved by forming the exposed portion 13g in a portion corresponding to the unevenness.

  In addition, the said embodiment and modification are examples of this invention, are not limited to such a form, The other arbitrary modification which does not contradict the meaning of this invention is included.

DESCRIPTION OF SYMBOLS 1 Case 2 Case member 2a Groove 3 Case member 3a Groove 4 Film-integrated waterproof packing (conventional example)
11 Film-integrated waterproof packing (first embodiment)
11a Film-integrated waterproof packing (Modification 1)
11b Waterproof packing with integrated film (Modification 2)
DESCRIPTION OF SYMBOLS 12 Flexible member 12a 1st contact part 12b 2nd contact part 12b1, 12b2 Protrusion part 13 Reinforcement member 13c Horizontal part 13d Wall part 13e Top part 13f End surface 13g Exposed part 21 Film-integrated waterproof packing (2nd Embodiment)
31 Film-integrated waterproof packing (third embodiment)
31a Film-integrated waterproof packing (Modification 3)
41 Film-integrated waterproof packing (fourth embodiment)
State before PP compression State after AP compression

Claims (6)

A waterproof packing that is inserted between a pair of case members constituting a casing of an electronic device and seals a gap between the case members,
A flexible member made of a rubber-like elastic body and a reinforcing member made of a resin film;
The flexible member has two contact portions, a first contact portion that contacts one case member and a second contact portion that contacts the other case member, and the first contact portion is also a second contact portion. The abutting portion also has a convex shape in the longitudinal section and the entire flexible member has no dent,
Reinforcing members intersect in the compression direction be internal to the flexible member, and a horizontal portion to suppress the horizontal deformation intersecting the compression direction, Ri rising in the compression direction, that to suppress the deformation in the compression direction wall A film-integrated waterproof packing comprising a series of resin films having a thickness of 35 μm to 100 μm.   The film-integrated waterproof packing according to claim 1, wherein the resin film has a thickness of 35 µm to less than 70 µm.   The film-integrated waterproof packing according to claim 1 or 2, wherein the reinforcing member is provided with a chevron portion having a top portion connecting the two wall portions.   The film-integrated waterproof packing according to any one of claims 1 to 3, wherein an end of the horizontal portion is exposed to the outside.   The film-integrated waterproof packing according to any one of claims 1 to 4, wherein the flexible member has a continuous portion continuous from the front side to the back side of the resin film. The film-integrated waterproof packing according to any one of claims 1 to 5, which is annular.

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