JP2014067916A - Adhesion structure of housing and portable information terminal using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesion structure which prevents overflow of an adhesive and enables a frame to be narrowed.SOLUTION: In an adhesion structure of this invention, buffer parts (17) which face an adhesive filling part (15) and form spaces where an adhesive (30) overflowed from the adhesive filling part (15) is collected, are formed in at least one of a first support part (11) or a second support part (13) at a frame (20) of a housing (10).

Description

  The present invention relates to a bonding structure for a housing and a portable information terminal using the same.

  As shown in FIG. 5, an information terminal such as a portable terminal is provided with a device 5 such as a circuit board, a battery, and a backlight inside the housing 1. The frame of the body 1 and the peripheral edge of the cover glass 3 of the display panel are bonded by an adhesive member.

  As the adhesive member, an adhesive or a double-sided tape is used. For example, when an adhesive is used, the adhesive may overflow from the gap between the casing 1 and the cover glass 3 due to pressing when the casing 1 and the cover glass 3 are bonded. Yes. In addition, a technique for bonding in a waterproof manner with a waterproof double-sided tape without using a waterproof packing is also considered. As these examples, Patent Document 1 discloses an airtight adhesion method for enhancing the airtightness of a lid to a box, and Patent Document 2 discloses a portable electronic device having a simple waterproof structure.

  The airtight bonding method described in Patent Document 1 is a temporary fixing step in which a double-sided adhesive tape is applied to the inner horizontal surface of the opening peripheral portion of the box having a step inside the opening peripheral portion, and a lid is inserted into the opening. And an adhesive filling step of filling the gap between the periphery of the lid and the opening peripheral edge of the box with an adhesive, and an adhesive curing step of curing the adhesive and fixing the lid to the box.

  The portable electronic device described in Patent Document 2 is fixed to the first housing, the one surface side on the first housing, and includes an electronic module including an electronic component, and a waterproof adhesive member. A first cover that covers the electronic module by being watertightly attached to the first casing, a board module that is fixed to the other surface side of the first casing and includes a circuit board, and a waterproof adhesive member And a second cover that covers the substrate module by being water-tightly attached to the first casing.

Japanese Patent Laid-Open No. 2-10891 (released on January 16, 1990) JP 2012-95152 A (published May 17, 2012)

  However, since the technique described in Patent Document 1 is temporarily fixed with a double-sided adhesive tape and the adhesive is filled into the gap between the periphery of the lid and the opening peripheral edge of the box, the number of work steps is large and time-consuming. Further, when the adhesive is filled into the gap between the periphery of the lid and the peripheral edge of the opening of the box, there is a problem that the adhesive overflows from the gap unless the double-sided adhesive tape is thick. On the other hand, if the thickness of the double-sided adhesive tape is large, a gap is generated between the box and the lid, and airtightness cannot be maintained. There is a method of preventing the adhesive from overflowing by using a thin double-sided adhesive tape, but it is necessary to widen the width of the inner horizontal surface to which the double-sided adhesive tape of the box is attached. In this case, the width of the frame of the box is increased, and there is a problem that the frame portion becomes wider when used for a portable terminal or the like.

  On the other hand, in the technique described in Patent Document 2, the attachment of the first cover to the first housing and the attachment of the second cover to the second housing are based on a waterproof adhesive member, specifically, a double-sided tape. Therefore, it is necessary to increase the width of the double-sided tape to some extent in order to achieve strong adhesion. For this reason, the width of the frame of the first and second housings must be increased in accordance with the width of the double-sided tape, and the frame portion becomes wider when used for a portable terminal or the like as in Patent Document 1. There's a problem. In addition, since such a double-sided tape is formed by cutting out a sheet into a frame shape, there is a problem that when a device becomes large, a part that is wasted increases and costs increase.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an adhesive structure capable of preventing overflow of an adhesive member and narrowing the frame, and a portable information terminal using the same. It is.

  In order to solve the above problems, an adhesive structure according to one embodiment of the present invention has an opening on an upper surface, a plate-like member is fitted into the opening, and is fixed to the plate-like member via the adhesive member. The housing frame has a frame-shaped first support portion for supporting a thickness portion of the plate-like member from the side, and a peripheral portion of the plate-like member from below. A frame-shaped second support portion for supporting, and a frame-shaped adhesive member filling portion that is a space filled with the adhesive member, wherein the adhesive member filling portion includes the first support portion and the second support portion. And is a space in which at least one of the first support part or the second support part faces the adhesive member filling part and collects adhesive members overflowing from the adhesive member filling part A buffer portion is formed.

  According to one aspect of the present invention, it is possible to prevent the adhesive member from overflowing and to narrow the frame.

It is a figure which shows the adhesion structure in this Embodiment. It is a figure which shows the adhesion structure in the modification 1. It is a figure which shows the adhesion structure in the modification 2. It is a figure which shows the adhesion structure in the comparative example with respect to this invention. It is a figure which shows a housing | casing and the cover glass for protecting a display panel.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the same members are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIGS. 1A and 1B are diagrams showing an adhesion structure in the present embodiment. FIG. 1A is a perspective view showing a state before a cover glass for protecting the display panel is bonded to the housing, and FIG. 1B is a diagram for protecting the display panel on the housing. It is sectional drawing which shows the state after a cover glass was adhere | attached. With reference to FIG. 1 (a), (b), the adhesion structure of this invention is demonstrated.

  A housing 10 included in a mobile terminal as an example of an information terminal of the present invention includes a substrate, a battery, a backlight, and the like disposed therein, and a plate-like cover glass (plate-like member) 50 in an opening provided on the upper surface. Is inserted, and the housing 10 and the cover glass 50 are bonded to each other by an adhesive (adhesive member) 30. The frame 20 of the housing 10 includes a first support part 11 and a second support part 13 for supporting a cover glass 50 for protecting the display panel, and an adhesive filling part (adhesive member) filled with the adhesive 30. Filling portion) 15 and a buffer portion 17 for collecting the adhesive 30 leaking from the adhesive filling portion 15 are formed.

  The adhesive filling portion 15 is a frame-like space between the first support portion 11 and the second support portion 13, and the space is filled with the adhesive 30. The adhesive filling part 15 has a frame-shaped horizontal surface 15a that constitutes the bottom of the space.

  The 1st support part 11 is a frame-shaped convex part which supports the cover glass 50 from a side, The adhesive agent filling part 15 is formed in the inner peripheral side of this convex part. The first support portion 11 has a horizontal surface 11 a higher than the horizontal surface 15 a that forms the bottom of the adhesive filling portion 15, and a vertical surface 11 b that is adjacent to the horizontal surface 15 a that forms the bottom of the adhesive filling portion 15. A step is formed by the horizontal surface 11 a and the vertical surface 11 b and the horizontal surface 15 a constituting the bottom of the adhesive filling portion 15. The vertical surface 11b of the first support part 11 supports the cover glass 50 from the side by sandwiching the surface in the thickness direction of the cover glass 50. In other words, supporting the cover glass 50 from the side means restricting the movement of the cover glass 50 to the side.

  The second support portion 13 is a frame-like convex portion that supports the cover glass 50 from below, and is formed inside the adhesive filling portion 15. The convex part of the 2nd support part 13 is lower than the horizontal surface 11a which the 1st support part 11 has, and comprises the horizontal surface 13a which is higher than the horizontal surface 15a which comprises the bottom part of the adhesive filling part 15, and the bottom part of the adhesive filling part 15. And a vertical surface 13b adjacent to the horizontal surface 15a. A step is formed by the horizontal surface 13 a and the vertical surface 13 b and the horizontal surface 15 a constituting the bottom of the adhesive filling portion 15. The horizontal surface 13a of the second support portion 13 supports the peripheral edge of the bottom surface of the cover glass 50 from below. The difference between the horizontal surface 11a of the first support portion 11 and the horizontal surface 13a of the second support portion 13a is preferably about the same as the thickness of the cover glass 50.

  The buffer portion 17 is a space formed by forming a recess in the second support portion 13. When the adhesive 30 leaks from the adhesive filling portion 15, the adhesive leaked from the adhesive filling portion 15 into this space. 30 are collected. A plurality of buffer portions 17 are formed in the second support portion 13, and each of the plurality of buffer portions 17 is formed by cutting the second support portion 13 into a predetermined shape from the horizontal surface 13 a side at a predetermined interval. ing.

  The second support portion 13 includes a horizontal surface 17a lower than a horizontal surface 15a constituting the bottom portion of the adhesive filling portion 15, and a vertical surface 17b adjacent to the horizontal surface 15a constituting the bottom portion of the adhesive filling portion 15, with the buffer portion 17 As part of the space. Specifically, the buffer unit 17 is a substantially rectangular parallelepiped space. A step is formed by a horizontal surface 17 a and a vertical surface 17 b that constitute a part of the space of the buffer portion 17 and a horizontal surface 15 a that constitutes the bottom of the adhesive filling portion 15. When the adhesive 30 filled in the adhesive filling part 15 leaks, the adhesive 30 flows into the buffer part 17 through this step.

  Further, the total volume of the plurality of buffer parts 17 is preferably 20% or more of the volume of the adhesive filling part 15. Thereby, even if the adhesive 30 having an amount of ± 10% of the volume of the adhesive filling portion 15 is filled, the adhesive 30 leaking from the adhesive filling portion 15 is collected without leaking from the buffer portion 17. Can do.

  The volume of the adhesive filling portion 15 is a value obtained by multiplying the area of the horizontal surface 15a of the adhesive filling portion 15 by the size of the second support portion 13 protruding from the horizontal surface 15a. Further, the volume of the buffer unit 17 is a value obtained by multiplying the area from the horizontal surface 17a to the horizontal surface 13a of the second support unit 13 by setting the area of the horizontal surface 17a in the buffer unit 17 as a bottom area. The total volume of the plurality of buffer units 17 is a value obtained by integrating (accumulating) the volumes obtained for each.

  In addition, the adhesive 30 preferably has a viscosity that stops without flowing out of the buffer portion 17, for example, a viscosity before curing is 1 to 100 Pa · s.

  Moreover, it is preferable that the bonding width corresponding to the width of the frame 20 is 2 mm or less, which is a combination of the horizontal surface 15 a constituting the bottom of the adhesive filling portion 15 and the horizontal surface 17 a constituting the bottom of the buffer portion 17. Thereby, with respect to the configuration using the double-sided tape, the adhesive width between the housing 10 and the cover glass 50 can be reduced while maintaining sufficient adhesion between the housing 10 and the cover glass 50. Play.

  FIG. 4 is a view showing an adhesive structure in a comparative example for the present invention. Unlike the present invention, when there is no ingenuity in the way of providing the buffer portion, as shown in FIG. And a frame-like convex fourth support portion 103 that supports the peripheral edge of the cover glass 50 from below, and a third support portion 101 and a fourth support portion 104. A frame-shaped convex adhesive application part 130 that supports the peripheral edge of the cover glass 50 from below, and between the adhesive application part 130 and the third support part 101 and between the adhesive application part 130 and the fourth support part 103. And buffer units 120 and 121, respectively. The buffer units 120 and 121 are frame-shaped spaces.

  In contrast, the frame 20 of the housing 10 of the present embodiment includes a first support portion 11 corresponding to the third support portion 101, a second support portion 13 corresponding to the fourth support portion 103, and an adhesive application portion. Although the adhesive filling portion 15 corresponding to 130 is included, the buffer portion 17 is provided on the second support portion 13 without separately providing portions corresponding to the buffer portions 120 and 121. For this reason, the space for the substantial buffer portion 17 does not exist between the second support portion 13 and the first support portion 11. Therefore, the width of the frame of the housing can be made smaller than that of the comparative example.

<Modification 1>
The frame 20 of the housing 10 in the present embodiment has a structure in which a step is formed by the adhesive filling portion 15 and the buffer portion 17. As shown in FIGS. 2A and 2B, the frame 20 </ b> A of the housing 10 in Modification 1 is composed of a horizontal surface 15 a that forms the bottom of the adhesive filling unit 15 and a horizontal surface 17 a that forms the bottom of the buffer unit 17. May be on the same plane. In this case, the vertical surface 17 b does not exist in the second support portion 13, but when the adhesive 30 leaks from the adhesive filling portion 15, the adhesive 30 flows into the buffer portion 17 and is collected in the buffer portion 17. .

<Modification 2>
In the second modification, the position where the buffer unit 17 is provided is different from the present embodiment. FIGS. 3A and 3B are diagrams showing an adhesive structure in the second modification. FIG. 3A is a perspective view showing a state before a cover glass for protecting the display panel is bonded to the housing, and FIG. 3B is a diagram for protecting the display panel on the housing. It is sectional drawing which shows the state after a cover glass was adhere | attached. Differences from FIGS. 1A and 1B will be mainly described with reference to FIGS.

  The frame 20 </ b> B of the housing 10 leaks from the first support portion 11 and the second support portion 13 for supporting the cover glass 50, the adhesive filling portion 15 filled with the adhesive 30, and the adhesive filling portion 15. A plurality of buffer portions 17 are formed to collect the adhesive 30 that exits.

  The first support portion 11 is cut into a predetermined shape from the vertical surface 11b side at predetermined intervals, whereby a plurality of buffer portions 17 are formed. The first support portion 11 includes a horizontal surface 17a lower than a horizontal surface 15a constituting the bottom of the adhesive filling portion 15, a vertical surface 17d adjacent to the horizontal surface 15a constituting the bottom of the adhesive filling portion 15, and a buffer portion 17. As part of the composition. A step is formed by the horizontal surface 17 a and the vertical surface 17 d and the horizontal surface 15 a that forms the bottom of the adhesive filling portion 15. When the adhesive 30 filled in the adhesive filling part 15 leaks, the adhesive 30 flows into the buffer part 17 through this step.

  The 2nd support part 13 is a frame-like convex part which supports cover glass 50 from the lower part, and adhesive filling part 15 is formed in the perimeter side of this convex part. The second support portion 13 includes a horizontal surface 13a higher than the horizontal surface 15a constituting the bottom portion of the adhesive filling portion 15, and a vertical surface (the outer peripheral side of the convex portion) adjacent to the horizontal surface 15a constituting the bottom portion of the adhesive filling portion 15. Surface) 13b. There is a step between the horizontal surface 13 a and the vertical surface 13 b and the horizontal surface 15 a that forms the bottom of the adhesive filling portion 15.

  In the adhesive structure of the present invention, the buffer portion is provided in either the first support portion or the second support portion, but the present invention is not limited to this. You may make it provide in both a 1st support part and a 2nd support part.

[Summary]
An adhesion structure according to one embodiment of the present invention is an adhesion structure of a housing in which an opening is provided on an upper surface, a plate-like member is fitted in the opening, and is fixed to the plate-like member via the adhesion member. The frame of the housing includes a frame-shaped first support portion that supports the thickness portion of the plate-shaped member from the side, and a frame-shaped second support portion that supports the peripheral portion of the plate-shaped member from below. And a frame-shaped adhesive member filling part that is a space filled with the adhesive member, the adhesive member filling part being formed between the first support part and the second support part, At least one of the first support portion and the second support portion is formed with a buffer portion that faces the adhesive member filling portion and is a space in which the adhesive members overflowing from the adhesive member filling portion are collected.

  According to said structure, since the buffer part faces the adhesive member filling part, when an adhesive member leaks from an adhesive member filling part, an adhesive member flows toward the buffer part and is collected. Moreover, since the buffer part is formed in at least one of the 1st support part or the 2nd support part, it is not necessary to ensure the location which provides a buffer part other than a 1st, 2 support part in the frame of a housing | casing. . Thereby, the width of the frame can be reduced. Therefore, it is possible to provide an adhesive structure capable of preventing overflow of the adhesive member and narrowing the frame.

  Further, in the adhesive structure according to one aspect of the present invention, a frame-like horizontal plane that forms a bottom portion of the adhesive member filling portion is lower than a horizontal plane where the second support portion supports the plate-like member, and the adhesive member filling The part supports the peripheral part of the plate-like member from below through the filled adhesive member.

  According to said structure, the height of the adhesive member filling part is prescribed | regulated uniformly by the difference of the horizontal surface which a 2nd support part supports a plate-shaped member, and the horizontal surface which comprises the bottom part of an adhesive member filling part. For this reason, when a plate-shaped member is fitted in the housing, excess adhesive member exceeding the height of the adhesive member filling portion flows into the buffer portion. Therefore, it is possible to fix each other without forming a gap in the contact portion between the housing and the plate-like member.

  In the bonding structure of the present invention, the bonding width obtained by combining the width of the horizontal plane that forms the bottom of the bonding member filling portion and the width of the contact surface that supports the plate-like member of the second support portion is 2 mm or less. It is.

  According to said structure, with respect to the structure which uses a double-sided tape, there exists an effect that the frame of a housing | casing can be narrowed, maintaining sufficient adhesion | attachment with a housing | casing and a plate-shaped member.

  Moreover, the adhesion structure which concerns on 1 aspect of this invention WHEREIN: The volume of the said buffer part is 20% or more of the volume of the said adhesive member filling part.

  According to said structure, even if it fills the adhesive member of the quantity of +/- 10% of the volume of an adhesive member filling part, the adhesive member which leaked from the adhesive member filling part is collected without leaking from a buffer part. it can.

  Moreover, the adhesion structure which concerns on 1 aspect of this invention WHEREIN: As for the said adhesive member, the viscosity before hardening is the range of 1-100 Pa.s.

  According to the above configuration, the adhesive member can be fastened without flowing out of the buffer portion.

  In addition, a portable information terminal according to one embodiment of the present invention uses the housing having the adhesive structure.

  According to said structure, the portable information terminal using the housing | casing of the adhesion structure which can prevent the overflow of an adhesion member and a narrow frame can be provided.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Case 11 1st support part 11a Horizontal surface 11b Vertical surface 13 Second support part 13a Horizontal surface 13a Second support part 13b Vertical surface 15 Adhesive filling part (adhesive member filling part)
15a Horizontal surface 17 Buffer portion 17a Horizontal surfaces 17b, 17d Vertical surface 30 Adhesive (adhesive member)
50 Cover glass (plate member)

Claims (6)

An opening is provided on the upper surface, a plate-like member is fitted into the opening, and an adhesive structure of a housing fixed to the plate-like member via an adhesive member,
The frame of the housing includes a frame-shaped first support portion that supports a thickness portion of the plate-shaped member from the side, a frame-shaped second support portion that supports a peripheral portion of the plate-shaped member from below, A frame-shaped adhesive member filling portion that is a space filled with the adhesive member;
The adhesive member filling portion is formed between the first support portion and the second support portion,
At least one of the first support portion and the second support portion is formed with a buffer portion that faces the adhesive member filling portion and is a space in which the adhesive members overflowing from the adhesive member filling portion are collected. An adhesive structure characterized by that. The frame-like horizontal plane that forms the bottom of the adhesive member filling portion is lower than the horizontal plane where the second support portion supports the plate-like member,
The adhesive structure according to claim 1, wherein the adhesive member filling portion supports a peripheral portion of the plate-like member from below through the filled adhesive member.   The bonding width obtained by combining a width of a horizontal plane constituting a bottom portion of the adhesive member filling portion and a width of a contact surface supporting the plate-like member of the second support portion is 2 mm or less. Item 3. The adhesive structure according to Item 1 or 2.   4. The adhesive structure according to claim 1, wherein a volume of the buffer part is 20% or more of a volume of the adhesive member filling part. 5.   The adhesive structure according to any one of claims 1 to 4, wherein the adhesive member has a viscosity of 1 to 100 Pa · s before curing. A portable information terminal using the housing having the adhesive structure according to claim 1.

Images