JP7212453B2 - Metal-resin bonded plates, housings and electronic devices - Google Patents

Description

The present invention relates to a metal-resin bonding plate, a housing, and an electronic device.

High-performance electronic components that generate a large amount of heat are being used in electronic devices.
On the other hand, it is necessary to suppress problems caused by electromagnetic waves generated from these electronic components, that is, EMI (electromagnetic interference) as much as possible. For this reason, the main method used is to use metal materials with excellent electromagnetic wave shielding properties (e.g., galvanized steel sheets, copper foil, aluminum foil, etc.) for housings that house electronic components, and to shield radio waves by reflecting them from the surface. ing. By using such a metal member, it is also possible to enjoy the advantage of facilitating the dissipation of the amount of heat generated within the device (see Patent Documents 1 and 2, for example).

JP-A-2002-176282 JP-A-2005-108328

Due to the recent tendency to reduce the weight of electronic devices, there is also a demand for lighter weight housings for housing electronic components. Therefore, there is a strong demand from the industrial world for a housing for housing electronic components that has electromagnetic wave shielding properties, is excellent in heat radiation characteristics and mechanical strength, and is lightweight.

Here, according to the studies of the present inventors, a metal member having electromagnetic shielding properties and heat dissipation properties is used as the main part of the housing, and the strength of this metal member is reinforced with a resin member, thereby improving the electromagnetic shielding properties and heat dissipation properties. And while maintaining the mechanical strength, it is possible to replace a part of the housing from a heavy metal member to a lightweight resin member. As a result, the inventors have found that it is possible to obtain a case having an excellent balance of lightness, electromagnetic wave shielding properties, heat dissipation properties, and mechanical strength.

On the other hand, according to the studies of the present inventors, it has become clear that if the resin members are asymmetrically formed on both sides of the metal member, the metal-resin joint plate may warp.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a metal-resin joint plate capable of realizing a housing having an excellent balance of light weight, heat dissipation characteristics, electromagnetic wave shielding properties, and mechanical strength, and suppressing warping. It is something to do.

The present inventors have made intensive studies in order to achieve the above objects. As a result, it was found that when the resin member was thermoformed on the surface of the metal member, the metal member was subjected to stress due to thermal contraction of the resin composition for forming the resin member. Then, the resin members are asymmetrically formed on both sides of the metal member, and when the difference between the stress applied from one surface of the metal member and the stress applied from the other surface is large, the metal-resin joint plate warps. I found out that there is a case where it is lost.
The inventors of the present invention further conducted extensive studies based on the above findings. As a result, a metal member having electromagnetic wave shielding properties and heat dissipation properties is used as the main part of the housing, and the strength of this metal member is reinforced with a resin member, and the first resin member is joined to the first surface of the metal member. The first stress on the metal member and the second stress on the metal member due to the second resin member joined to the second surface opposite to the first surface of the metal member are offset so that the first resin member and By joining the second resin member to the metal member, it is possible to realize a housing having an excellent balance of lightness, heat dissipation characteristics, electromagnetic wave shielding properties, and mechanical strength, and to obtain a metal-resin joint plate with suppressed warpage. The inventors have found that it is possible to achieve the present invention.

According to the present invention, the following metal-resin bonding plate, housing, and electronic device are provided.

[1]
A metal-resin bonding plate used for a housing containing electronic components,
a plate-shaped metal member for forming a housing wall;
a first resin member bonded to the first surface of the metal member;
a second resin member joined to a second surface of the metal member opposite to the first surface;
with
The first resin member and the second resin member are arranged asymmetrically with respect to the plate surface of the metal member,
The first resin member and the second resin member are arranged so that the first stress applied to the metal member by the first resin member and the second stress applied to the metal member by the second resin member are offset. and a metal-resin bonded plate.
[2]
In the metal-resin bonded plate according to [1] above,
Let S1 be the total area of the joints between the _first resin member and the metal member,
Let S2 be the total area of the joints between the _second resin member and the metal member,
The average height of the _first resin member is H1,
When the average height of the _second resin member is H2,
A metal-resin bonded plate that satisfies the following requirements (A) or (B).
(A) S ₁ >S ₂ and H ₁ <H ₂
(B) S ₁ <S ₂ and H ₁ >H ₂
[3]
In the metal-resin bonded plate according to [1] or [2] above,
A metal-resin bonded plate, wherein the first resin member and the second resin member have the same resin composition.
[4]
In the metal-resin bonded plate according to [1] above,
Let S1 be the total area of the joints between the _first resin member and the metal member,
Let S2 be the total area of the joints between the _second resin member and the metal member,
Let the coefficient of thermal expansion of the _first resin member be X1,
When the coefficient of thermal expansion of the _second resin member is X2,
A metal-resin bonded plate that satisfies the following requirement (C) or (D).
(C) S ₁ >S ₂ and X ₁ <X ₂
(D) S ₁ <S ₂ and X ₁ >X ₂
[5]
In the metal-resin bonded plate according to [1] above,
Let the coefficient of thermal expansion of the _first resin member be X1,
Let the coefficient of thermal expansion of the _second resin member be X2,
The average height of the _first resin member is H1,
When the average height of the _second resin member is H2,
A metal-resin bonded plate that satisfies the following requirements (E) or (F).
(E) H ₁ >H ₂ and X ₁ <X ₂
(F) H ₁ <H ₂ and X ₁ >X ₂
[6]
In the metal-resin bonded plate according to [4] or [5] above,
A metal-resin joint plate in which the resin compositions of the first resin member and the second resin member are different.
[7]
The metal-resin bonded plate according to any one of [1] to [6] above,
The metal member has a fine concavo-convex structure on at least a joint surface of the first resin member and the second resin member,
A metal-resin joint plate, wherein parts of the first resin member and the second resin member are located in the fine uneven structure.
[8]
The metal-resin bonded plate according to any one of [1] to [7] above,
A metal-resin joint plate, wherein at least a part of the first resin member and the second resin member are respectively formed in a frame shape on the surface of the metal member.
[9]
The metal-resin bonded plate according to any one of [1] to [8] above,
The metal-resin bonding plate is a metal-resin bonding plate having a planar structure in which the housing is developed.
[10]
A housing comprising the metal-resin bonding plate according to any one of [1] to [9] above.
[11]
An electronic device comprising the housing according to [10] above and an electronic component housed in the housing.

According to the present invention, it is possible to realize a housing having an excellent balance of light weight, heat dissipation characteristics, electromagnetic wave shielding properties, and mechanical strength, and to provide a metal-resin bonding plate with suppressed warpage.

1 is a perspective view schematically showing an example of the structure of a metal-resin bonding plate according to an embodiment of the present invention; FIG. (a) and (b) are in a reverse relationship. 2 is a cross-sectional view taken along the line XX' of FIG. 1; FIG. 1 is a perspective view schematically showing an example of the structure of a metal-resin bonding plate according to an embodiment of the present invention; FIG. (a) and (b) are in a reverse relationship. 4 is a cross-sectional view taken along the line XX' of FIG. 3; FIG. 1 is a perspective view schematically showing an example of the structure of a metal-resin bonding plate according to an embodiment of the present invention; FIG. (a) and (b) are in a reverse relationship. 6 is a cross-sectional view taken along the line XX' of FIG. 5; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing an example of the structure of a development-patterned metal-resin joint plate according to an embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing an example of the structure of a development-patterned metal-resin joint plate according to an embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing an example of the structure of a development-patterned metal-resin joint plate according to an embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which showed typically an example of the structure of the housing|casing of embodiment which concerns on this invention. Consists of any three parallel linear portions and any three linear portions perpendicular to the three linear portions on the surface of the joint between the metal member and the resin member constituting the metal-resin bonded plate according to the present embodiment. It is a schematic diagram for demonstrating the measurement location of a total of 6 straight line parts.

An embodiment of the present invention will be described below with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the explanation thereof is omitted as appropriate. Also, the drawings are schematic diagrams and do not correspond to actual dimensional ratios. Unless otherwise specified, "~" between numbers in the text represents the above to the following.

First, the metal-resin bonding plate 10 according to this embodiment will be described. FIG. 1 is a perspective view schematically showing an example of the structure of a metal-resin bonding plate 10 according to an embodiment of the invention. FIG. 2 is a cross-sectional view taken along line XX' of FIG.

A metal-resin bonding plate 10 according to the present embodiment is a metal-resin bonding plate used in a housing for housing electronic components, and includes a plate-shaped metal member 11 for forming a housing wall and a metal member 11. A first resin member 17A joined to the first surface 11A and a second resin member 17B joined to the second surface 11B of the metal member 11 opposite to the first surface 11A, The first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface (center line C1 in FIG. 2), and the first stress to the metal member 11 by the first resin member 17A, The first resin member 17A and the second resin member 17B are configured such that the second stress applied to the metal member 11 by the second resin member 17B is offset.
In this embodiment, it is preferable to include at least a portion in which the first resin member 17A and the second resin member 17B are arranged to face each other in the direction perpendicular to the plate surface of the metal member 11 .
In this embodiment, the housing wall specifically indicates at least one selected from side plates (four sides), a bottom plate and a cover plate of the housing. Further, "asymmetrical" with respect to the plate surface of the metal member 11 is defined as not having a plane-symmetrical relationship with the plate-shaped metal member 11 as a plane mirror, and "symmetrical" with respect to the plate surface of the metal member 11 is defined. is defined as being in a symmetrical relationship.
In the present embodiment, the first resin member 17A and the second resin member 17B are collectively referred to as the resin member 17 as well. Further, in this embodiment, as a specific aspect in which the first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11, for example, the first resin member 17A and the The bonding area S1 with the metal member 11 is different from the bonding area S2 between the _second resin member 17B and the metal member 11, and the height of the first resin member 17A and the height of the _second resin member 17B are different. A mode, a mode in which the positions of the first resin member 17A and the second resin member 17B are shifted in the direction perpendicular to the plate surface of the metal member 11, and the like.

As described above, due to the recent tendency to reduce the weight of electronic devices, there is also a demand for reducing the weight of cases for housing electronic components. Therefore, there is a strong demand from the industrial world for a housing for housing electronic components that has electromagnetic wave shielding properties, is excellent in heat radiation characteristics and mechanical strength, and is lightweight.
Here, according to the studies of the present inventors, a metal member having electromagnetic shielding properties and heat dissipation properties is used as the main part of the housing, and the strength of this metal member is reinforced with a resin member, thereby improving the electromagnetic shielding properties and heat dissipation properties. And while maintaining the mechanical strength, it is possible to replace a part of the housing from a heavy metal member to a lightweight resin member. As a result, the inventors have found that it is possible to obtain a case having an excellent balance of lightness, electromagnetic wave shielding properties, heat dissipation properties, and mechanical strength.
On the other hand, according to the studies of the present inventors, it has become clear that if the resin members are asymmetrically formed on both sides of the metal member, the metal-resin joint plate may warp.

The present inventors have made intensive studies in order to achieve the above objects. As a result, it was found that when the resin member was thermoformed on the surface of the metal member, the metal member was subjected to stress due to thermal contraction of the resin composition for forming the resin member. Then, the resin members are asymmetrically formed on both sides of the metal member, and when the difference between the stress applied from one surface of the metal member and the stress applied from the other surface is large, the metal-resin joint plate warps. I found out that there is a case where it is lost.
The inventors of the present invention further conducted extensive studies based on the above findings. As a result, the metal member 11 having electromagnetic shielding properties and heat dissipation properties is used as the main part of the housing, and the strength of the metal member 11 is reinforced by the resin member 17 (the first resin member 17A and the second resin member 17B). A first stress applied to the metal member 11 by the first resin member 17A bonded to the first surface 11A of the member, and a second resin bonded to the second surface 11B opposite to the first surface 11A of the metal member 11. By joining the first resin member 17A and the second resin member 17B to the metal member 11 so that the second stress applied to the metal member 11 by the member 17B is offset, light weight, heat dissipation characteristics, and electromagnetic wave shielding properties are achieved. The present inventors have also found that it is possible to realize a housing having an excellent balance of mechanical strength and to obtain a metal-resin bonded plate 10 in which warping is suppressed.

In the metal-resin bonded plate 10 according to the present embodiment, a first resin member 17A and a second resin member 17B are bonded to both surfaces of a plate-like metal member 11 for reinforcing the strength of the metal member 11, respectively. By doing so, the metal member 11 can be reinforced from both sides, so that the mechanical strength of the housing having the metal-resin bonding plate 10 can be improved. As a result, the thickness of the metal member 11 can be reduced while suppressing the deterioration of the mechanical strength of the metal-resin bonding plate 10 . As a result, in the housing having the metal-resin bonding plate 10 according to the present embodiment, a part of the housing is replaced from a heavy metal member to a lightweight resin member, so that the conventional housing having the metal-resin bonding plate 10 as a whole is made of a metal member. It can be made lighter than the housing. That is, the metal-resin bonding plate 10 according to the present embodiment is formed by bonding the first resin member 17A and the second resin member 17B to both surfaces of the plate-like metal member 11, thereby forming a housing having the metal-resin bonding plate 10. It is possible to maintain or improve the mechanical strength while reducing the weight of the body.
In addition, since the housing having the metal-resin bonding plate 10 according to the present embodiment includes the plate-shaped metal member 11 as the housing wall, it is equivalent to the conventional housing in which the entire housing is made of metal members. An electromagnetic wave shield function can be obtained.

Furthermore, in the metal-resin bonding plate 10 according to the present embodiment, the first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11. The first resin member 17A and the second resin member 17B are configured such that the first stress applied to the metal member 11 by the second resin member 17B and the second stress applied to the metal member 11 by the second resin member 17B are offset. Therefore, the convex warp of the metal member 11 toward the first surface 11A side and the convex warp of the metal member 11 toward the first surface 11B side are balanced. be.

As described above, in the metal-resin bonding plate 10 according to the present embodiment, the first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11, and warping is suppressed. ing. Furthermore, according to the metal-resin bonding plate 10 according to the present embodiment, it is possible to realize a housing having an excellent balance of lightness, heat dissipation characteristics, electromagnetic wave shielding properties, and mechanical strength.

The metal-resin bonding plate 10 according to the present embodiment is designed so that the first stress applied to the metal member 11 by the first resin member 17A and the second stress applied to the metal member 11 by the second resin member 17B are offset. , a first resin member 17A and a second resin member 17B. Examples of the configuration of the first resin member 17A and the second resin member 17B include the following examples 1 to 3. However, the metal-resin bonded plate 10 of the present invention is not limited to these examples.

(Example 1)
In the metal-resin bonded plate 10 of Example 1, the total area of the joints between the _first resin member 17A and the metal member 11 is S1, and the total area of the joints between the second resin member 17B and the metal member 11 is S1. S2, the average height of the _first resin member 17A is H1, and the _average height of the _second resin member 17B is H2. can be done.
(A) S ₁ >S ₂ and H ₁ <H ₂
(B) S ₁ <S ₂ and H ₁ >H ₂
FIG. 1 is a perspective view schematically showing an example of the structure of a metal-resin bonding plate 10 according to the present invention that satisfies the above requirement (A). 2 is a cross-sectional view taken along line XX' of FIG.
That is, the metal-resin bonded plate 10 of Example 1 is bonded to the first resin member 17A bonded to the first surface 11A of the metal member 11 and the second surface 11B of the metal member 11 opposite to the first surface 11A. The first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11 (center line C1 in FIG. 2), The average height of the resin member 17 having a larger bonding area with the metal member 11 is lower.
Here, as the bonding area between the resin member 17 and the metal member 11 increases, the stress exerted by the resin member 17 on the metal member 11 increases. In addition, as the average height of the resin member 17 increases, the stress applied to the metal member 11 by the resin member 17 increases. Therefore, by configuring the height of the resin member 17 having a larger joint area with the metal member 11 to be lower, the first stress applied to the metal member 11 by the first resin member 17A and the second resin member 11 2nd stress to the metal member 11 by 17B can be canceled.

Here, in the present embodiment, the average height of the resin member 17 is the average value of the thickness of the reinforcing resin member 17 in the metal-resin joint plate 10 according to the present embodiment. 10 points can be measured and their average value can be taken as the average height. It should be noted that the screw portions for mechanically engaging the metal plates with screws or the like, projections for grounding, and projections and recesses such as projections for fixing electronic components do not reduce the strength of the metal member 11. Since it is not a resin member for reinforcement, it is excluded from the resin member 17 .
Further, in the present embodiment, the area of the joint between the resin member 17 and the metal member 11 is the area of the joint surface between the resin member 17 and the metal member 11 .

In the metal-resin bonded plate 10 of Example 1, it is preferable that the first resin member 17A and the second resin member 17B have the same resin composition. By doing so, the resin member 17 can be formed with respect to the metal member 11 by one thermoforming, so that the productivity of the metal-resin bonding plate 10 can be improved.

(Example 2)
In the metal-resin bonded plate 10 of Example 2, the total area of the joints between the _first resin member 17A and the metal member 11 is S1, and the total area of the joints between the second resin member 17B and the metal member 11 is S1. S2, the coefficient of thermal expansion of the _first resin member 17A is _X1 , and the coefficient of thermal expansion of the _second resin member 17B is X2. can be done.
(C) S ₁ >S ₂ and X ₁ <X ₂
(D) S ₁ <S ₂ and X ₁ >X ₂
FIG. 3 is a perspective view schematically showing an example of the structure of the metal-resin bonding plate 10 according to the embodiment of the present invention that satisfies the requirement (C). 4 is a cross-sectional view taken along line XX' of FIG. 3. FIG.
That is, the metal-resin bonded plate 10 of Example 2 is bonded to the first resin member 17A bonded to the first surface 11A of the metal member 11 and the second surface 11B of the metal member 11 opposite to the first surface 11A. The first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11 (center line C1 in FIG. 4), The thermal expansion coefficient of the resin member 17 having a larger bonding area with the metal member 11 is lower.
Here, as the bonding area between the resin member 17 and the metal member 11 increases, the stress exerted by the resin member 17 on the metal member 11 increases. In addition, as the coefficient of thermal expansion of the resin member 17 increases, the stress applied to the metal member 11 by the resin member 17 increases. Therefore, by configuring the resin member 17 having a larger bonding area with the metal member 11 to have a lower coefficient of thermal expansion, the first stress applied to the metal member 11 by the first resin member 17A and the second resin The second stress applied to the metal member 11 by the member 17B can be canceled.
Here, the coefficient of thermal expansion of the resin member 17 can be adjusted by adjusting the composition of the resin composition forming the resin member 17, for example. For example, the coefficient of thermal expansion of the resin member 17 can be lowered by increasing the amount of filler in the resin composition.

Here, in this embodiment, the thermal expansion coefficient of the resin member 17 is the thermal expansion coefficient of the resin member 17 for reinforcing the strength of the metal member 11 in the metal-resin bonding plate 10 according to this embodiment. It should be noted that the screw portions for mechanically engaging the metal plates with screws or the like, projections for grounding, and projections and recesses such as projections for fixing electronic components do not reduce the strength of the metal member 11. Since it is not a resin member for reinforcement, it is excluded from the resin member 17 .

In the metal-resin bonded plate 10 of Example 2, it is preferable that the first resin member 17A and the second resin member 17B have different resin compositions. This makes it easier to adjust the difference between the thermal expansion coefficient X1 of the _first resin member 17A and the thermal expansion coefficient X2 of the _second resin member 17B.
In addition, in the metal-resin bonding plate 10 of Example 2, it is preferable that the average height H1 of the first resin member 17A and the _average height H2 of the _second resin member 17B are substantially the same.

(Example 3)
In the metal-resin bonding plate 10 of Example 3, the coefficient of thermal expansion of the _first resin member 17A is X1, the coefficient of thermal expansion of the _second resin member 17B is X2, and the average height of the _first resin member 17A is H1. Assuming that the average height of the _second resin member 17B is H2, it is possible to adopt a configuration that satisfies the following requirement (E) or (F).
(E) H ₁ >H ₂ and X ₁ <X ₂
(F) H ₁ <H ₂ and X ₁ >X ₂
FIG. 5 is a perspective view schematically showing an example of the structure of the metal-resin bonding plate 10 according to the embodiment of the present invention that satisfies the requirement (F). 6 is a cross-sectional view taken along line XX' of FIG.
That is, the metal-resin bonded plate 10 of Example 3 has the first resin member 17A bonded to the first surface 11A of the metal member 11 and the second surface 11B of the metal member 11 opposite to the first surface 11A. The first resin member 17A and the second resin member 17B are arranged asymmetrically with respect to the plate surface of the metal member 11 (center line C1 in FIG. 6), The coefficient of thermal expansion of the resin member 17 having the larger average height is lower.
Here, as the average height of the resin member 17 increases, the stress applied to the metal member 11 by the resin member 17 increases. In addition, as the coefficient of thermal expansion of the resin member 17 increases, the stress applied to the metal member 11 by the resin member 17 increases. Therefore, by configuring the resin member 17 having a larger average height to have a lower thermal expansion coefficient, the first stress applied to the metal member 11 by the first resin member 17A and the metal stress applied by the second resin member 17B are reduced. It becomes possible to cancel out the second stress to the member 11 .
Here, the coefficient of thermal expansion of the resin member 17 can be adjusted by adjusting the composition of the resin composition forming the resin member 17, for example. For example, the coefficient of thermal expansion of the resin member 17 can be lowered by increasing the amount of filler in the resin composition.

In the metal-resin bonded plate 10 of Example 3, it is preferable that the first resin member 17A and the second resin member 17B have different resin compositions. This makes it easier to adjust the difference between the thermal expansion coefficient X1 of the _first resin member 17A and the thermal expansion coefficient X2 of the _second resin member 17B.
Further, in the metal-resin bonded plate 10 of Example 3, the total area S1 of the joints between the _first resin member 17A and the metal member 11 and the total area of the joints between the second resin member 17B and the metal member 11 are It is preferably about the same as _S2 .

In the metal-resin bonded plate 10 according to the present embodiment, the metal member 11 has a fine uneven structure at least on the joint surface with the resin member 17, and a part of the resin member 17 is positioned in the fine uneven structure. is preferred. In this case, since the metal member 11 and the resin member 17 are joined by a part of the resin member 17 being positioned in the fine concave-convex structure, the joint strength between the metal member 11 and the resin member 17 can be improved. can.
As a result, the mechanical strength of the housing having the metal-resin bonding plate 10 according to the present embodiment can be improved, so that the thickness of the metal member 11 constituting the metal-resin bonding plate 10 can be made thinner. can. As a result, a lighter housing can be obtained.
Here, from the viewpoint of further increasing the contact area between the metal member 11 and the resin member 17 and further improving the bonding strength between the metal member 11 and the resin member 17, a part of the resin member 17 is formed in the fine concave-convex structure. It is preferable that the metal member 11 and the resin member 17 are directly joined by infiltration. Direct bonding means bonding without an intervening layer such as an adhesive-containing layer between the metal member 11 and the resin member 17 .

In the metal-resin bonded plate 10 according to the present embodiment, the surface area of the joint portion of the resin member 17 to the total surface area of the metal member 11 (hereinafter sometimes abbreviated as joint area ratio) is, for example, 1 area % or more and 50%. Area % or less, preferably 2 area % or more and 40 area % or less, more preferably 5 area % or more and 30 area % or less. When the joint area ratio is equal to or higher than the above lower limit, the mechanical strength of the housing having the metal-resin joint plate 10 according to the present embodiment can be improved. When the joint area ratio is equal to or less than the above upper limit, it is possible to obtain a lightweight housing with even better heat radiation properties.

In the metal-resin bonded plate 10 according to the present embodiment, the resin member 17 is preferably bonded to at least the peripheral portion of the surface of the metal member 11 as shown in FIG. 1, for example. By doing so, the metal member 11 can be more effectively reinforced with a smaller amount of the resin member 17 . Furthermore, since the amount of the resin member 17 used can be reduced, deformation of the metal member 11 due to shrinkage of the resin member 17 during molding can be further suppressed.

In the metal-resin bonding plate 10 according to the present embodiment, it is preferable that at least part of the resin member 17 is formed like a frame on the surface of the metal member 11, as shown in FIG. 1, for example. The framework shape includes, for example, at least one shape selected from a brace shape, a grid shape, a truss shape, and a frame shape. Forming the resin member 17 in a frame shape on the surface of the metal member 11 is preferable because the metal member 11 can be more effectively reinforced with a smaller amount of the resin member 17 .
Furthermore, by forming the resin member 17 in a frame shape on the surface of the metal member 11, the amount of the resin member 17 used can be reduced. In addition, it is possible to further suppress deterioration of the heat dissipation characteristics of the housing having the metal-resin bonding plate 10 due to the resin member 17 .

The thickness of the resin member 17 according to the present embodiment may be the same thickness at all locations, or may vary from location to location.
In the metal-resin bonded plate 10 according to this embodiment, the average thickness of the resin member 17 bonded to the surface of the metal member 11 depends on the average thickness of the metal member 11 and the size of the entire housing. 0 mm to 10 mm, preferably 1.5 mm to 8 mm, more preferably 1.5 mm to 5.0 mm.
When the average thickness of the resin member 17 is equal to or greater than the above lower limit value, the mechanical strength of the resulting housing can be improved.
By setting the average thickness of the resin member 17 to be equal to or less than the upper limit, the weight of the resulting housing can be reduced. In addition, since the amount of resin member 17 used can be reduced, deformation of metal member 11 due to shrinkage of resin member 17 during molding can be further suppressed.

It is preferable that the metal-resin bonding plate 10 according to the present embodiment has a planar structure in which the casing is unfolded. Here, the development shape means, for example, at least one plate (A) selected from a cover plate and a bottom plate for forming a housing, and at least one plate (A) integrally bent and connected to the plate (A). One side plate (B) (hereinafter also referred to as a side plate 202) is provided, and a part of the housing can be formed by folding the plate (A) and the side plate (B).

7 to 9 are perspective views schematically showing an example of the structure of the developed metal-resin bonding plate 20 according to the embodiment of the present invention. FIG. 10 is a perspective view schematically showing an example of the structure of the housing 100 of the embodiment according to the invention.
As the developed metal-resin bonding plate 10, for example, a developed metal-resin bonding plate 20 shown in FIGS.
The developed metal-resin bonding plate 20 according to this embodiment includes at least one plate (A) selected from a metal bottom plate 201 and a metal lid plate 203, and the plate (A) is integrally bent. and a metal side plate 202 (at least one selected from 202-1, 202-2, 202-3, and 202-4) connected by a A resin member 301 is bonded to both surfaces of the metal member (M) shown in the figure, preferably directly bonded, and the metal member (M) is reinforced by the resin member 301 . Here, in the development diagram-like metal-resin bonding plate 20 according to the present embodiment, the metal member (M) corresponds to the metal member 11 in the metal-resin bonding plate 10, and the resin member 301 corresponds to the first resin member 17A and the second resin member 17A. It corresponds to the member 17B.
By doing so, the mechanical strength of the housing 100 can be improved, and each metal member (metal bottom plate 201, metal side plates 202 (202-1, 202-2, 202-3 and 202-4), the thickness of the metal cover plate 203) can be made thinner. As a result, a lightweight housing 100 can be obtained. Direct bonding means bonding in which an intervening layer such as an adhesive-containing layer does not exist between the metal member (M) and the resin member 301 .

The metal member (M) according to the present embodiment includes at least one plate (A) selected from the metal bottom plate 201 and the metal cover plate 203, and is integrally bent and connected to the plate (A). and a metal side plate 202 (at least one selected from 202-1, 202-2, 202-3, and 202-4). One preferred embodiment consists of a bottom plate 201, a side plate 202-1, a side plate 202-2, a side plate 202-3, and a side plate 202-4. The second preferred embodiment consists of a bottom plate 201 , side plates (front plate) 202 - 1 , side plates (both side plates) 202 - 2 and 202 - 4 and lid plate 203 . A third preferred embodiment consists of a bottom plate 201, a side plate 202-1, a side plate 202-2, a side plate 202-3, a side plate 202-4, and a cover plate 203. Among these embodiments, embodiments 2 and 3 are particularly preferred.
By doing so, the number of components of the housing 100 can be further reduced, and as a result, process control can be made easier and the number of grounding locations can be reduced. Further, since the number of parts and the number of grounding points can be further reduced, a lighter housing 100 can be realized.

Here, the side plates 202 are preferably engaged with each other by mechanical means, for example. Mechanical engagement means (also referred to as physical engagement means) is not particularly limited, and examples thereof include screwing. The side plate 202 and at least one plate (A) selected from the bottom plate 201 and lid plate 203 may be engaged by the mechanical means described above, or may be integrally bent to any one side plate. may be linked. 7, four side plates 202-1, 202-2, 202-3, and 202-4 are used, but in this embodiment, one to three side plates 202 are selected from these. Embodiments are also included.

In the developed metal-resin bonding plate 20 according to the present embodiment, it is preferable that the resin member 301 is not bonded to the boundary line 205 between the plate (A) for forming the housing wall and the side plate 202 . By doing so, it becomes easier to bend the boundary line portion 205 between the plate (A) for forming the housing wall and the side plate 202, and the housing 100 according to the present embodiment can be obtained more easily. .

In the developed graphic metal-resin bonding plate 20 according to the present embodiment, the surface of at least one plate (A) selected from the metal bottom plate 201 and the metal lid plate 203 and the surface of the plate (A) are integrated with the plate (A). A resin member 301 is joined to each surface of the metal side plates 202 (at least one selected from 202-1, 202-2, 202-3, and 202-4) that are bent and connected. preferably. By doing so, the mechanical strength of the housing 100 can be improved, and the thickness of the metal member (M) can be reduced. As a result, a lighter housing 100 can be obtained.

It is preferable that the metal member (M) according to the present embodiment has a fine concavo-convex structure similar to that of the joint surface of the metal member 11 on the joint surface with the resin member 301 . In this case, since the metal member (M) and the resin member 301 are joined by a part of the resin member 301 entering the fine concave-convex structure, the joint strength between the metal member (M) and the resin member 301 can be improved. can be As a result, the mechanical strength of the housing 100 can be improved, so that the thickness of the metal member (M) forming the housing 100 can be made thinner. As a result, a lighter housing 100 can be obtained.

Here, the fine concave-convex structure on the surface of the metal member (metal member 11 and metal member (M)) according to the present embodiment is, for example, a fine concave-convex structure in which convex portions with an interval period of 5 nm or more and 500 μm or less stand. .
Part of the resin member according to the present embodiment (for example, the first resin member 17A, the second resin member 17B, the resin member 301, etc.) enters into such a fine uneven structure, whereby the resin member is joined to the metal member. . By doing so, a physical resistance force (anchor effect) is effectively generated between the metal member and the resin member according to the present embodiment, and the metal member and the resin member according to the present embodiment are further strengthened. It becomes possible to join.

Further, as shown in FIGS. 7 to 10, the housing 100 according to this embodiment may have openings 207 and slits 209 in a portion of the housing wall (preferably the side plate 202). By having the opening 207 in a part of the housing wall, it is possible to blow air into the housing 100 through the opening 207 using a blower or the like, and as a result, the electronic components in the housing 100 heat up. In this case, the electronic component can be cooled by blowing air.
In addition, by having the slit 209 in a part of the housing wall, the wind taken in from the opening 207 can be discharged to the outside of the housing 100 .

Each member constituting the metal-resin bonding plate 10 and the developed metal-resin bonding plate 20 according to the present embodiment will be described below.

<Metal member>
The metal material constituting the metal member (for example, the metal member 11 and the metal member (M)) according to the present embodiment is not particularly limited, but metals having electromagnetic wave shielding properties are preferable, such as iron, steel materials, stainless steel, and aluminum. , aluminum alloys, magnesium, magnesium alloys, copper, copper alloys, titanium and titanium alloys. These may be used alone or in combination of two or more.
Among these, aluminum (single aluminum) and aluminum alloys are preferable, and aluminum alloys are more preferable, from the viewpoints of light weight, low cost, and high strength.

Although the aluminum alloy is not particularly limited, it is an alloy containing aluminum as a main component. Specifically, an alloy of aluminum and at least one metal selected from copper, manganese, silicon, magnesium, zinc, nickel and the like can be exemplified.
As the aluminum alloy according to the present embodiment, the four-digit number of the international aluminum alloy name specified by Japanese Industrial Standards (JIS H4140) is an aluminum/copper-based alloy in the 2000s and an aluminum/manganese-based alloy in the 3000s. , 4000 series aluminum/silicon based alloys, 5000 series aluminum/magnesium based alloys, 6000 series aluminum/magnesium/silicon based alloys, 7000 series aluminum/zinc/magnesium based alloys, aluminum/zinc/magnesium/copper based alloys etc. are preferably used. Among these, aluminum/magnesium alloys in the 5000 series are particularly preferred from the standpoint of availability and mechanical/thermal properties.

The thickness of the metal member according to the present embodiment may be the same at all locations, or may vary from location to location. The average thickness of the metal member according to the present embodiment is preferably 0.2 mm or more and 1.0 mm or less, more preferably 0.2 mm or more and 1.0 mm or less, and particularly preferably 0.2 mm or more and 0.8 mm or less.
When the average thickness of the metal member according to the present embodiment is equal to or greater than the above lower limit, the mechanical strength, heat dissipation characteristics, and electromagnetic wave shielding characteristics of the resulting housing can be improved.
When the average thickness of the metal member according to the present embodiment is equal to or less than the upper limit value, the weight of the resulting housing can be reduced. Furthermore, when the average thickness of the metal member is equal to or less than the upper limit value, it becomes easier to bend the metal member, and the productivity of the housing can be further improved.

The shape of the metal member according to this embodiment can be, for example, a plate shape. The metal member according to the present embodiment is formed by processing the above metal material into a predetermined shape by a known method such as cutting, plastic working by pressing, etc., punching, cutting, polishing, and metal removal such as electrical discharge machining, and then processing the metal material into a predetermined shape, which will be described later. It is preferable that the roughening treatment is performed. In short, it is preferable to use a material processed into a required shape by various processing methods.

It is preferable that, on the surface of the joint between the metal member according to the present embodiment and the resin member, a fine concavo-convex structure in which convex portions with an interval period of 5 nm or more and 500 μm or less are formed.
Here, the interval period of the fine concave-convex structure is the average value of the distances from one convex to the adjacent convex, and can be obtained using a photograph taken with an electron microscope or a laser microscope, or using a surface roughness measuring device.
The interval period measured by an electron microscope or a laser microscope is usually an interval period of less than 500 nm. Specifically, the joint surface of the metal member is photographed. From the photograph, 50 arbitrarily selected convex portions are selected, and the distances from these convex portions to adjacent convex portions are measured. The sum of all the distances from one convex portion to the adjacent convex portion and dividing by 50 is taken as the interval period. On the other hand, spacing periods greater than 500 nm are usually determined using a surface roughness measuring device.
In addition, since surface roughening treatment is usually applied not only to the joint surface of the metal member but also to the entire surface of the metal member, You can also measure the interval period from

The interval period is preferably 10 nm or more and 300 μm or less, more preferably 20 nm or more and 200 μm or less.
When the interval period is equal to or greater than the lower limit, a portion of the resin member can sufficiently penetrate into the recesses of the fine uneven structure, and the bonding strength between the metal member and the resin member can be further improved. Further, when the interval period is equal to or less than the upper limit value, it is possible to suppress the occurrence of a gap in the joint portion between the metal member and the resin member. As a result, it is possible to suppress the penetration of impurities such as moisture through the gaps at the metal-resin interface, thereby suppressing a decrease in strength when the housing is used under high temperature and high humidity conditions.

As a method for forming the fine relief structure having the interval period, a method of immersing a metal member in an inorganic base aqueous solution containing NaOH or the like and/or an inorganic acid aqueous solution containing HCl, _HNO3 or the like; Method of processing the member; mechanical cutting, for example, a method of forming unevenness on the surface of the metal member by pressing a mold punch having unevenness produced by diamond abrasive grain grinding or blasting, sandblasting, knurling, laser processing. A method for producing an uneven shape on the surface of a metal member by adding one or more aqueous solutions selected from hydrazine hydrate, ammonia, and water-soluble amine compounds, as disclosed in WO 2009/31632 pamphlet. and the like. These methods can be used properly depending on the type of metal material forming the metal member and the uneven shape formed within the range of the interval period. In the present embodiment, the method of immersing the metal member in an inorganic base aqueous solution containing NaOH or the like and/or an inorganic acid aqueous solution containing HCl, _HNO3 or the like can collectively treat a wide range of metal members. Moreover, it is preferable because it is excellent in bonding strength between the metal member and the resin member.

FIG. 11 shows arbitrary three parallel straight line portions and arbitrary straight line portions perpendicular to the three straight line portions on the joint surface 104 of the metal member and the resin member constituting the metal-resin joint plate according to the present embodiment. It is a schematic diagram for demonstrating the measurement location of a total of 6 linear parts which consist of 3 linear parts.
From the viewpoint of further improving the bonding strength between the metal member and the resin member, any three parallel straight line portions and any three straight line portions perpendicular to the three straight line portions on the joint surface 104 of the metal member It is preferable that the surface roughness measured in accordance with JIS B0601 (corresponding international standard: ISO4287) simultaneously satisfies the following requirements (1) and (2) for a total of 6 linear portions consisting of:
(1) Including one or more linear sections where the load length ratio (Rmr) of the roughness curve at a cutting level of 20% and an evaluation length of 4 mm is 30% or less (2) Evaluation length of all linear sections Ten-point average roughness (Rz) at 4 mm exceeds 2 μm

For the six straight portions, for example, six straight portions B1 to B6 as shown in FIG. 11 can be selected. First, as a reference line, a center line B1 passing through the center A of the joint surface 104 of the metal member is selected. Then select straight lines B2 and B3 that are parallel to the center line B1. Next, a center line B4 orthogonal to the center line B1 is selected, and straight lines B5 and B6 orthogonal to the center line B1 and parallel to the center line B4 are selected. Here, the vertical distances D1 to D4 between the straight lines are, for example, 2 to 5 mm.
Generally, the metal member is subjected to a surface roughening treatment not only on the surface 104 of the joining portion of the metal member with the resin member, but also with respect to the entire metal member. Six straight sections may be selected from locations other than the joint surface 104 on the same side as the section surface 104 or on the opposite side.

It is not necessarily clear why a housing having a more excellent joint strength between the metal member and the resin member can be obtained by satisfying the above requirements (1) and (2) at the same time. This is probably because 104 has a structure capable of effectively exhibiting an anchor effect between the metal member and the resin member.

From the viewpoint of further improving the bonding strength between the metal member and the resin member, any three parallel straight line portions and any three straight line portions perpendicular to the three straight line portions on the joint surface 104 of the metal member For a total of 6 straight parts consisting of, the surface roughness measured in accordance with JIS B0601 (corresponding international standard: ISO4287) further satisfies one or more of the following requirements (1A) to (1C) Preferably, it is particularly preferable to satisfy requirement (1C).
(1A) The load length ratio (Rmr) of the roughness curve at a cutting level of 20% and an evaluation length of 4 mm is preferably 2 or more, more preferably 3 or more, and most preferably 30% or less. (1B) Cutting level 20%, load length ratio (Rmr) of roughness curve at evaluation length 4 mm is 20% or less. (1C) A cutting level of 40% and a linear portion with a roughness curve load length ratio (Rmr) of 60% or less at an evaluation length of 4 mm. preferably contains 1 or more straight segments, more preferably 2 or more straight segments, even more preferably 3 or more straight segments, most preferably 6 straight segments

In addition, from the viewpoint of further improving the bonding strength between the metal member and the resin member, the cutting level measured in accordance with JIS B0601 (corresponding international standard: ISO4287) on the joint surface 104 of the metal member is 20%, The average value of the load length ratio (Rmr) of the roughness curve at an evaluation length of 4 mm is preferably 0.1% or more and 40% or less, more preferably 0.5% or more and 30% or less, and still more preferably It is 1% or more and 20% or less, and most preferably 2% or more and 15% or less.
As the average value of the load length ratio (Rmr), the average value of the load length ratio (Rmr) of the arbitrary six linear portions can be adopted.

The load length ratio (Rmr) of the joint surface 104 of the metal member according to this embodiment can be controlled by appropriately adjusting the roughening treatment conditions for the surface of the metal member.
In this embodiment, factors for controlling the load length ratio (Rmr) include the type and concentration of the etchant, the temperature and time of the roughening treatment, the timing of the etching treatment, and the like.

From the viewpoint of further improving the bonding strength between the metal member and the resin member, any three parallel straight line portions and any three straight line portions perpendicular to the three straight line portions on the joint surface 104 of the metal member It is preferable that the surface roughness measured in accordance with JIS B0601 (corresponding international standard: ISO4287) further satisfies the following requirement (2A) for a total of 6 linear portions consisting of:
(2A) The ten-point average roughness (Rz) at an evaluation length of 4 mm of all linear portions is preferably over 5 μm, more preferably 10 μm or more, and even more preferably 15 μm or more.

From the viewpoint of further improving the bonding strength between the metal member and the resin member, the average value of the ten-point average roughness (Rz) on the joint surface 104 of the metal member is preferably more than 2 μm and 50 μm or less, more preferably. is more than 5 μm and 45 μm or less, more preferably 10 μm or more and 40 μm or less, particularly preferably 15 μm or more and 30 μm or less.
As the average value of the ten-point average roughness (Rz), the average value of the ten-point average roughness (Rz) of the above arbitrary six linear portions can be adopted.

From the viewpoint of further improving the bonding strength between the metal member and the resin member, any three parallel straight line portions and any three straight line portions perpendicular to the three straight line portions on the joint surface 104 of the metal member It is preferable that the surface roughness measured according to JIS B0601 (corresponding international standard: ISO4287) further satisfies the following requirement (4) for a total of 6 linear portions consisting of:
(4) The average length (RSm) of roughness curve elements of all linear portions is more than 10 μm and less than 300 μm, more preferably 20 μm or more and 200 μm or less.

From the viewpoint of further improving the joint strength between the metal member and the resin member, the average value of the average length (RSm) of the roughness curve elements on the joint surface 104 of the metal member is preferably more than 10 μm and less than 300 μm, It is more preferably 20 μm or more and 200 μm or less.
As the average value of the average length (RSm) of the roughness curve element, the average value of the ten-point average roughness (Rz) of the arbitrary six linear portions can be adopted.
Here, in the present embodiment, when the average thickness of the metal member is in the range of 500 μm or more, the interval period is the average value of the average length (RSm) of the roughness curve elements.

The ten-point average roughness (Rz) of the joint surface 104 of the metal member according to the present embodiment and the average length (RSm) of the roughness curve element appropriately adjust the roughening treatment conditions for the surface of the metal member. It is possible to control by
In this embodiment, the temperature and time of the roughening treatment, the amount of etching, etc. are factors for controlling the above-mentioned ten-point average roughness (Rz) and the average length (RSm) of the roughness curve element. .

Next, a method for preparing a metal member that satisfies the above interval period, load length ratio (Rmr), ten-point average roughness (Rz), average length of roughness curve element (RSm), etc. will be described.
Such a metal member can be formed, for example, by roughening the surface of the metal member using an etchant.
Hereinafter, a metal member roughening treatment method for obtaining a metal member that satisfies the above interval period, load length ratio (Rmr), ten-point average roughness (Rz), average length of roughness curve element (RSm), etc. shows an example of However, the roughening treatment method for a metal member according to this embodiment is not limited to the following examples.

(1) Pretreatment Step First, it is desirable that the metal member does not have a thick film made of an oxide film, a hydroxide, or the like on the surface of the metal member that is to be joined to the resin member. In order to remove such a thick film, the surface layer may be polished by mechanical polishing such as sandblasting, shot blasting, grinding, barrel processing, or chemical polishing before the next step of treating with an etchant. good. If the surface to be joined with the resin member is significantly contaminated with machine oil or the like, it is preferable to perform treatment with an alkaline aqueous solution such as sodium hydroxide solution or potassium hydroxide solution, or degreasing.

(2) Surface Roughening Treatment Process In the present embodiment, as the surface roughening treatment method for the metal member, it is preferable to perform treatment with an acid-based etchant, which will be described later, at a specific timing. Specifically, the treatment with the acid-based etchant is preferably performed in the final stage of the surface roughening treatment process.

Examples of the method of roughening treatment using the acid-based etchant include treatment methods by immersion, spraying, and the like. The treatment temperature is preferably 20 to 40° C., and the treatment time is preferably about 5 to 350 seconds, more preferably 20 to 300 seconds, particularly preferably 50 to 300 seconds, from the viewpoint of more uniformly roughening the surface of the metal member.

The surface of the metal member is roughened into an uneven shape by the roughening treatment using the acid-based etchant. The etching amount (dissolution amount) in the depth direction of the metal member when using the acid-based etchant is preferably 0.1 to 500 μm when calculated from the mass, specific gravity and surface area of the dissolved metal member. , more preferably 5 to 500 μm, more preferably 5 to 100 μm. If the etching amount is equal to or more than the above lower limit, the bonding strength between the metal member and the resin member can be further improved. Further, if the etching amount is equal to or less than the above upper limit, it is possible to reduce the processing cost. The amount of etching can be adjusted by the processing temperature, processing time, and the like.

In this embodiment, when the metal member is roughened using the acid-based etchant, the entire surface of the metal member may be roughened, and only the surface to which the resin member is to be bonded may be partially roughened. A roughening treatment may be performed.

(3) Post-treatment process In the present embodiment, it is usually preferable to perform water washing and drying after the surface roughening treatment process. The method of washing with water is not particularly limited, but it is preferable to wash by immersion or running water for a predetermined period of time.

Furthermore, as a post-treatment step, it is preferable to perform ultrasonic cleaning in order to remove smut and the like generated by the treatment using the acid-based etchant. The conditions for ultrasonic cleaning are not particularly limited as long as they can remove smut and the like generated, but the solvent used is preferably water, and the treatment time is preferably 1 to 20 minutes.

(Acid etchant)
In the present embodiment, the etching agent used for the roughening treatment of the surface of the metal member is preferably a specific acid-based etching agent, which will be described later. By treating the surface of the metal member with the above-mentioned specific etchant, a fine uneven structure suitable for improving the adhesion between the metal member and the resin member is formed, and the anchor effect bonds the metal member and the resin member. It is considered that the strength is further improved.

The components of the acid-based etchant that can be used in this embodiment are described below.

The acid-based etchant contains at least one of ferric ions and cupric ions, an acid, and optionally manganese ions and various additives.

- Ferric ion The ferric ion is a component that oxidizes the metal member, and the ferric ion can be contained in the acid etching agent by blending the ferric ion source. Examples of the ferric ion source include ferric nitrate, ferric sulfate, and ferric chloride. Among the above ferric ion sources, ferric chloride is preferable because it has excellent solubility and is inexpensive.

In the present embodiment, the content of the ferric ion in the acid-based etching agent is preferably 0.01 to 20% by mass, more preferably 0.1 to 12% by mass, and still more preferably 0.5 to 7%. % by weight, still more preferably 1 to 6% by weight, particularly preferably 1 to 5% by weight. When the ferric ion content is equal to or higher than the lower limit, it is possible to prevent a decrease in the roughening rate (dissolution rate) of the metal member. On the other hand, if the content of ferric ions is equal to or less than the upper limit, the roughening speed can be properly maintained, so uniform roughening that is more suitable for improving the bonding strength between the metal member and the resin member can be achieved. become possible.

- Cupric ion The cupric ion is a component that oxidizes the metal member, and the cupric ion can be contained in the acid-based etching agent by blending the cupric ion source. Examples of the cupric ion source include cupric sulfate, cupric chloride, cupric nitrate, and cupric hydroxide. Among the cupric ion sources, cupric sulfate and cupric chloride are preferable because they are inexpensive.

In the present embodiment, the content of the cupric ion in the acid-based etching agent is preferably 0.001 to 10% by mass, more preferably 0.01 to 7% by mass, and still more preferably 0.01% to 7% by mass. 05 to 1% by mass, still more preferably 0.1 to 0.8% by mass, still more preferably 0.15 to 0.7% by mass, and particularly preferably 0.15 to 0.4% by mass. When the cupric ion content is equal to or higher than the lower limit, it is possible to prevent a decrease in the roughening rate (dissolution rate) of the metal member. On the other hand, if the content of cupric ions is equal to or less than the upper limit, the roughening speed can be properly maintained, so uniform roughening suitable for improving the bonding strength between the metal member and the resin member can be achieved. become possible.

The acid-based etchant may contain only one of ferric ions and cupric ions, or may contain both, but both ferric ions and cupric ions is preferably included. Since the acid-based etchant contains both ferric ions and cupric ions, a good roughened shape more suitable for improving the bonding strength between the metal member and the resin member can be easily obtained.

When the acid-based etchant contains both ferric ions and cupric ions, the content of each of the ferric ions and cupric ions is preferably within the above range. In addition, the total content of ferric ions and cupric ions in the acid-based etching agent is preferably 0.011 to 20% by mass, more preferably 0.1 to 15% by mass, and even more preferably is 0.5 to 10% by weight, particularly preferably 1 to 5% by weight.

Manganese ions The acidic etchant may contain manganese ions in order to uniformly roughen the surface of the metal member. Manganese ions can be contained in the acid etching agent by blending a manganese ion source. Examples of the manganese ion source include manganese sulfate, manganese chloride, manganese acetate, manganese fluoride, and manganese nitrate. Among the manganese ion sources, manganese sulfate and manganese chloride are preferable because they are inexpensive.

In this embodiment, the manganese ion content in the acid-based etching agent is preferably 0 to 1% by mass, more preferably 0 to 0.5% by mass. The present inventors have confirmed that sufficient bonding strength can be obtained even when the manganese ion content is 0% by mass when the thermoplastic resin constituting the resin member is a polyolefin resin. That is, when a polyolefin resin is used as the thermoplastic resin, the manganese ion content is preferably 0% by mass. Used as appropriate.

- Acid The acid is a component that dissolves metals oxidized by ferric ions and/or cupric ions. Examples of the acid include inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, perchloric acid and sulfamic acid, and organic acids such as sulfonic acid and carboxylic acid. Examples of the carboxylic acid include formic acid, acetic acid, citric acid, oxalic acid, and malic acid. One or two or more of these acids can be blended in the acid-based etchant. Among the above inorganic acids, sulfuric acid is preferable because it has almost no odor and is inexpensive. Moreover, among the above organic acids, carboxylic acids are preferable from the viewpoint of uniformity of the roughened shape.

In the present embodiment, the content of the acid in the acid-based etchant is preferably 0.1 to 50% by mass, more preferably 0.5 to 50% by mass, and 1 to 50% by mass. is more preferably 1 to 30% by mass, even more preferably 1 to 25% by mass, and even more preferably 2 to 18% by mass. When the content of the acid is equal to or higher than the lower limit, it is possible to prevent a decrease in the roughening rate (dissolution rate) of the metal member. On the other hand, when the content of the acid is equal to or less than the upper limit, it is possible to prevent the precipitation of crystals of the metal salt of the metal member when the temperature of the liquid is lowered, so that the workability can be improved.

・Other components To the acid-based etchant that can be used in the present embodiment, a surfactant may be added to prevent uneven roughening due to surface contaminants such as fingerprints, and other additives may be added as necessary. You may Other additives include halide ion sources such as sodium chloride, potassium chloride, sodium bromide, and potassium bromide, which are added to form deep unevenness. Alternatively, thio compounds such as thiosulfate ions and thiourea, which are added to increase the roughening speed, azoles such as imidazole, triazole, and tetrazole, which are added to obtain a more uniform roughened shape; A pH adjuster or the like added to control the chemical reaction can also be exemplified. When these other components are added, the total content thereof is preferably about 0.01 to 10% by mass in the acid etching agent.

The acid-based etching agent of the present embodiment can be easily prepared by dissolving each of the above components in ion-exchanged water or the like.

<Resin member>
Hereinafter, resin members (for example, the first resin member 17A, the second resin member 17B, the resin member 301, etc.) according to the present embodiment will be described.
The resin member according to this embodiment is, for example, a resin member for reinforcing the strength of a metal member. Moreover, the resin member according to the present embodiment is made of, for example, a thermoplastic resin composition (P). The thermoplastic resin composition (P) contains a thermoplastic resin (P1) as an essential component, and optionally other compounding agents (P2). For the sake of convenience, even when the resin member consists only of the thermoplastic resin (P1), the resin member is described as being made of the thermoplastic resin composition (P).

(Thermoplastic resin (P1))
The thermoplastic resin (P1) is not particularly limited. Aromatic polyethers such as polyvinyl acetal resin, polyvinyl butyral resin, polyvinyl formal resin, polymethylpentene resin, maleic anhydride-styrene copolymer resin, polycarbonate resin, polyphenylene ether resin, polyether ether ketone resin, polyether ketone resin Ketone, polyester resin, polyamide resin, polyamideimide resin, polyimide resin, polyetherimide resin, styrene elastomer, polyolefin elastomer, polyurethane elastomer, polyester elastomer, polyamide elastomer, ionomer, aminopolyacrylamide resin, isobutylene Maleic anhydride copolymer, ABS, ACS, AES, AS, ASA, MBS, ethylene-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl chloride graft polymer, ethylene-vinyl alcohol copolymer, chlorinated polyvinyl chloride Resin, chlorinated polyethylene resin, chlorinated polypropylene resin, carboxyvinyl polymer, ketone resin, amorphous copolyester resin, norbornene resin, fluoroplastic, polytetrafluoroethylene resin, fluorinated ethylene polypropylene resin, PFA, polychlorofluoroethylene Resin, ethylene tetrafluoroethylene copolymer, polyvinylidene fluoride resin, polyvinyl fluoride resin, polyarylate resin, thermoplastic polyimide resin, polyvinylidene chloride resin, polyvinyl chloride resin, polyvinyl acetate resin, polysulfone resin, polyparamethylstyrene resin , polyallylamine resin, polyvinyl ether resin, polyphenylene oxide resin, polyphenylene sulfide (PPS) resin, polymethylpentene resin, oligoester acrylate, xylene resin, maleic acid resin, polyhydroxybutyrate resin, polysulfone resin, polylactic acid resin, poly Glutamic acid resin, polycaprolactone resin, polyethersulfone resin, polyacrylonitrile resin, styrene-acrylonitrile copolymer resin, acrylonitrile-butadiene-styrene copolymer resin, polyacetal resin, etc. can be lifted. These thermoplastic resins may be used singly or in combination of two or more.

Among these, polyolefin resins, polyester resins, polyamide resins, polyphenylene sulfide resins, polycarbonate resins, and polyether ether ketones are used from the viewpoint of more effectively improving the joint strength between metal members and resin members. Resins, polyetherketone resins, polyimide resins, polyethersulfone resins, polystyrene resins, polyacrylonitrile resins, styrene-acrylonitrile copolymer resins, acrylonitrile-butadiene-styrene copolymer resins, (meth)acrylic resins, and polyacetal resins One or two or more thermoplastic resins selected from are preferably used.

A polymer obtained by polymerizing an olefin can be used as the polyolefin-based resin without particular limitation.
Examples of olefins constituting the polyolefin resin include ethylene, α-olefins, cyclic olefins, and polar olefins.

Examples of the α-olefin include linear or branched α-olefins having 3 to 30 carbon atoms, preferably 3 to 20 carbon atoms. More specifically, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1- decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene and the like.

Examples of the cyclic olefins include cyclic olefins having 3 to 30 carbon atoms, preferably 3 to 20 carbon atoms. More specifically, cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, 2-methyl-1,4,5,8-dimethano-1,2,3,4,4a,5 , 8,8a-octahydronaphthalene and the like.

Examples of the polar olefin include vinyl acetate, methyl methacrylate, methyl acrylate and ethyl acrylate.

The olefins constituting the polyolefin resin are preferably ethylene, propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1- pentene and the like. Among these, ethylene, propylene, 1-butene, 1-hexene and 4-methyl-1-pentene are more preferred, and ethylene or propylene is even more preferred.

The polyolefin-based resin may be obtained by polymerizing one of the above-mentioned olefins alone, or may be obtained by random copolymerization, block copolymerization, or graft copolymerization of two or more of them in combination. .

The polyolefin-based resin may be a blend of polyolefins having different properties. Examples thereof include propylene homopolymer, propylene random copolymer, propylene block copolymer, propylene/ethylene copolymer rubber, ethylene/α-olefin copolymer (here, α- Olefins include blends with elastomers such as 1-butene, 1-hexene, 1-octene, etc.).

Further, the polyolefin-based resin may be linear or may have a branched structure.

Examples of the polyester-based resin include, for example, polylactic acid, polyglycolic acid, polycaprolactone, aliphatic polyesters such as polyethylene succinate, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate (PBT), polycyclohexylene dimethylene terephthalate (PCT ) and the like.

Examples of the polyamide resin include, for example, ring-opening aliphatic polyamides such as PA6 and PA12; polycondensation polyamides such as PA66, PA46, PA610, PA612 and PA11; MXD6, PA6T, PA9T, PA6T/66, PA6T/ 6, semi-aromatic polyamides such as amorphous PA; wholly aromatic polyamides such as poly (p-phenylene terephthalamide), poly (m-phenylene terephthalamide), poly (m-phenylene isophthalamide), amide elastomers, etc. be done.

(Other compounds (P2))
The thermoplastic resin composition (P) may contain other compounding agents (P2) for the purpose of imparting individual functions. The compounding agent (P2) includes a filler, a flame retardant, a flame retardant aid, a heat stabilizer, an antioxidant, a pigment, a weathering agent, a plasticizer, a dispersant, a lubricant, a release agent, an antistatic agent, an antistatic agent, Examples include impact modifiers and the like.

In this embodiment, the resin member preferably further contains a filler from the viewpoint of adjusting the difference in thermal expansion coefficient between the metal member and the resin member and improving the mechanical strength of the resin member.
As the filler, for example, one or more selected from the group consisting of hydrotalcites, glass fibers, carbon fibers, metal fibers, organic fibers, carbon particles, clay, talc, silica, minerals, and cellulose fibers. can be done. Among these, one or more selected from hydrotalcites, glass fibers, carbon fibers, talc, and minerals are preferred.
The shape of the filler is not particularly limited, and may be of any shape such as fibrous, particulate, or plate-like.

When the resin member contains a filler, its content is, when the entire resin member is 100% by mass, for example, 5% by mass or more and 95% by mass or less, preferably 10% by mass or more and 90% by mass or less, more preferably 20% by mass or more and 90% by mass or less, more preferably 30% by mass or more and 90% by mass or less, and particularly preferably 50% by mass or more and 90% by mass or less.

The filler has the effect of increasing the rigidity of the resin member and the effect of controlling the coefficient of thermal expansion of the resin member. In particular, in the case of the housing according to the present embodiment, the temperature dependence of the shape stability of the metal member and the resin member is often significantly different, so the housing is likely to be distorted when a large temperature change occurs. This strain can be reduced by including a filler in the resin member. In addition, when the content of the filler is within the above range, reduction in toughness can be suppressed.

In this embodiment, the filler is preferably a fibrous filler, more preferably glass fiber and carbon fiber, and particularly preferably glass fiber.
As a result, it is possible to suppress shrinkage of the resin member after molding, so that the joint between the metal member and the resin member can be made stronger.

The above-mentioned hydrotalcites include natural products and synthetic products, and examples thereof include hydrotalcites containing no water-containing basic carbonates such as magnesium, calcium, zinc, aluminum and bismuth, or water of crystallization thereof. Natural products include those having the _{structure Mg6Al2 ( OH} ) _16CO3.4H2O . Synthetic products include _{Mg0.7Al0.3 (} OH) _{2 ( CO3} ) _{0.15.0.54H2O , Mg4.5Al2 ( OH} ) _13CO3.3.5H2O , _{Mg4.2Al2 (} OH) _{12.4 ( CO3} ) _0.15 , _{Zn6Al2 ( OH} ) _{16CO3.4H2O , Ca6Al2 (} OH) _{16CO3.4H2O , Mg14Bi2 (} OH) _29.6 * _4.2H2O etc. are mentioned. The amount of the hydrotalcite compounded is preferably 0.01 parts by mass or more and 2 parts by mass or less per 100 parts by mass of the thermoplastic resin composition (P). When the blending amount of the hydrotalcites is at least the above lower limit, the heat resistance of the obtained resin member can be improved. When the blending amount of the hydrotalcites is equal to or less than the above upper limit, the resulting resin member can have better flame retardancy.

Examples of the flame retardant include bis(2,3-dibromopropyl) ether of tetrabromobisphenol A, bis(2,3-dibromopropyl) ether of tetrabromobisphenol S, bis(2,3 -dibromopropyl)ether, tris(2,3-dibromopropyl)isocyanurate and mixtures of two or more thereof. The content of the flame retardant is, for example, 5 to 25 parts by mass, preferably 10 to 20 parts by mass, per 100 parts by mass of the thermoplastic resin composition (P). When the content of the flame retardant is at least the above lower limit, the resulting resin member can have better flame retardancy. When the content of the flame retardant is equal to or less than the above upper limit, the resulting resin member can have better mechanical properties.

The thermoplastic resin composition (P) can contain a flame retardant aid. When the thermoplastic resin composition (P) contains a flame retardant aid, its content is 0.5 to 20 parts by mass, preferably 1 to 10 parts by mass, per 100 parts by mass of the thermoplastic resin composition (P). be. A sufficient synergistic effect with the flame retardant can be obtained when the content of the flame retardant aid is at least the above lower limit. When the content of the flame retardant auxiliary is equal to or less than the above upper limit, the resulting resin member can have better mechanical properties. Antimony trioxide (Sb ₂ O ₃ ), antimony pentoxide (Sb ₂ O ₅ ) and the like can be used as flame retardant aids.

The thermoplastic resin composition (P) preferably has high fluidity in order to facilitate penetration into the fine uneven structure provided on the surface of the metal member. Therefore, in the present embodiment, the thermoplastic resin composition (P) preferably has an MFR of 1 to 200 g/10 min measured under conditions of 230° C. and a load of 2.16 kg according to ASTM D1238. More preferably ~50 g/10 min.

(Method for producing thermoplastic resin composition (P))
The method for producing the thermoplastic resin composition (P) is not particularly limited, and it can be produced by a generally known method. For example, the following methods are mentioned. First, a thermoplastic resin (P1) and, if necessary, other compounding agents (P2) are mixed or The thermoplastic resin composition (P) is obtained by melt-mixing.

[Chassis]
Next, a case and a method for manufacturing the case according to the present embodiment will be described.
In the housing according to the present embodiment, at least one of the housing walls constituting the housing is made of the metal-resin bonding plate 10 according to the present embodiment, and all of the housing walls are made of the metal resin according to the present embodiment. It is preferably configured by the joint plate 10 . Further, it is more preferable that the housing 100 according to the present embodiment is configured by the developed metal-resin joint plate 20 .

Since the housing according to the present embodiment partially replaces heavy metal members with lightweight resin members, the weight of the housing can be reduced compared to conventional housings in which the entire housing is made of metal members. .
In addition, the housing according to the present embodiment is provided with a plate-shaped metal member in a part thereof, so that it is possible to obtain an electromagnetic wave shielding function equivalent to that of a conventional housing in which the entire housing is made of a metal member. can.
Furthermore, in the housing according to the present embodiment, by reinforcing the metal member with the resin member, it is possible to suppress a decrease in the mechanical strength of the housing caused by reducing the thickness of the metal member. That is, it is possible to maintain the mechanical strength while reducing the weight of the housing.
Furthermore, when the housing 100 according to the present embodiment is composed of the developed metal-resin joint plate 20, at least one plate (A) selected from the metal bottom plate 201 and the metal lid plate 203 and the metal side plate 202 (at least one selected from 202-1, 202-2, 202-3, and 202-4) are integrally connected, so that the plate (A) and the side plate 202 This eliminates the need for a part that connects to and reduces the number of parts, and as a result, simplifies process control. Also, it is possible to reduce the number of grounding points. Further, since the housing 100 according to the present embodiment can reduce the number of parts and the number of grounding locations, it is possible to realize a lighter housing 100 .
Furthermore, when the resin member is formed only on a part of the surface of the metal member, it is possible to prevent the entire surface of the metal member from being covered with the resin member, thereby maintaining good heat dissipation characteristics of the housing 100. can be done.

7 to 9 are perspective views schematically showing an example of the structure of the developed metal-resin bonding plate 20 according to the embodiment of the present invention. FIG. 10 is a perspective view schematically showing an example of the structure of the housing 100 of the embodiment according to the invention.
The method for manufacturing the housing 100 according to this embodiment includes, for example, the following steps (1) to (3).
(1) At least one plate (A) selected from a metal bottom plate 201 and a metal cover plate 203, and metal side plates 202 (202-1, 202) integrally connected to the plate (A) -2, at least one selected from 202-3, and 202-4), and preparing a development graphic metal plate having a fine uneven structure on the joint surface at least where the resin member is joined ( 2) A development-patterned metal plate is placed in a mold, a resin composition is injected into the mold, and a resin member is bonded to the surface of the development-patterned metal plate to form a development-patterned metal-resin bonded plate 20. Manufacturing process (3) A process of bending the boundary line 205 between the plates of the developed metal-resin bonding plate 20 to form the developed metal-resin bonding plate 20 into a box shape Housing according to the present embodiment In the manufacturing method of No. 100, the shape of the developed metal plate and metal-resin bonded plate 20, which are the intermediate products before bending, is flat, so that the storage efficiency and transportation efficiency of the intermediate products in large quantities are improved. There are merits.

(Step (1))
First, at least one plate (A) selected from a metal bottom plate 201 and a metal cover plate 203, and metal side plates 202 (202-1, 202- 2, 202-3, and 202-4), and has a fine uneven structure on at least the joint surface where the resin member is joined. A development pattern metal plate is prepared. Here, as shown in FIGS. 7 and 8, the developed metal plate may include both the metal bottom plate 201 and the metal cover plate 203, or the cover plate 203 as shown in FIG. You don't have to. Also, as shown in FIG. 8, one of the side plates (rear plate) 202-3 may not be provided. If the cover plate 203 is not provided, the cover plate 203 can be prepared separately and can be engaged with one side plate 202 by, for example, the mechanical engagement means described above. Similarly, when the rear plate 202-3 is not provided, a rear plate 202-3 (not shown) is prepared separately, and the surface formed by the bottom plate 201, the side plates 202-2, 202-4 and the lid plate 203 is provided. , for example, by the mechanical engagement means described above.
Here, the developed metal plate corresponds to a metal member constituting the housing 100. For example, the metal member is processed into a developed view, and at least the joint surface to which the resin member is joined is subjected to the roughening treatment described above. can be obtained by applying
Details of the metal member and the roughening treatment are omitted here.

(Step (2))
Next, the development-patterned metal plate is placed in a mold, and the resin composition is injected into the mold to bond the resin member to the surface of the development-patterned metal plate.
Examples of methods for joining resin members include injection molding, transfer molding, compression molding, reaction injection molding, blow molding, thermoforming, and press molding. Among these, the injection molding method is preferred. That is, it is preferable that the resin member is an injection molded body. An example using an injection molding method will be described below.

A method of joining a resin member to a development-patterned metal plate using an injection molding method includes, for example, the following steps (i) to (ii).
(i) A step of arranging the development-patterned metal plate in the injection molding mold (ii) Injecting the resin composition into the mold so that at least a part of the resin member is in contact with the development-patterned metal plate , Step of Molding Resin Member Hereinafter, a specific description will be given.

First, (i) a mold for injection molding is prepared, the mold is opened, and a developed metal plate is arranged in the cavity (space). (ii) Thereafter, the mold is closed, and a resin composition is injected into the cavity portion of the mold so that at least a part of the resin member is in contact with the development-pattern metal plate and solidified, and the development-pattern metal plate is and the resin member. After that, the mold is opened and released to obtain the development-pattern metal-resin bonded plate 20 in which the resin member is joined to the development-pattern metal plate. As the mold, for example, an injection mold generally used in high-speed heat cycle molding (RHCM, heat & cool molding) can be used.

Here, in the above step (ii), from the start of injection of the resin composition to the completion of holding pressure, the surface temperature of the mold is preferably set to the glass transition temperature (hereinafter also referred to as Tg) of the resin member or higher. , more preferably Tg + (5 or more and 100 or less) ° C. or higher.
As a result, the resin composition can be brought into contact with the surface of the development pattern metal plate at high pressure for a longer time while maintaining the resin composition in a softened state.
As a result, the adhesiveness between the developed metal plate and the resin member can be improved, so that the housing 100 with even better bonding strength can be obtained more stably.

In the above step (ii), after the pressure holding is completed, the surface temperature of the mold is preferably lower than the glass transition temperature of the resin member, more preferably Tg-(5 or more and 100 or less) ° C. or less. Cooling.
As a result, the softened resin member can be rapidly solidified. As a result, the molding cycle of the housing 100 can be shortened, so that the housing 100 can be obtained efficiently.

The adjustment of the mold surface temperature can be carried out by connecting a rapid heating and cooling device to the mold. A commonly used method can be adopted for the rapid heating and cooling device.

As a heating method, any one of steam, pressurized hot water, hot water, hot oil, electric heater, and electromagnetic induction heating, or a combination thereof may be used.
Specifically, by introducing a heating medium selected from steam, hot water, and hot oil into a flow channel provided near the surface of the mold, or by using electromagnetic induction heating, the surface temperature of the mold is is preferably maintained at a temperature equal to or higher than the glass transition temperature of the resin member.

As a cooling method, either one of a cold water system and a cold oil system or a combination thereof may be used.
Specifically, by introducing a cooling medium selected from cold water and cold oil into a flow path provided near the surface of the mold, the surface temperature of the mold is lowered to a temperature below the glass transition temperature of the resin member. Cooling is preferred.

In the step (ii) above, the time from the start of the injection to the completion of the holding pressure is preferably 1 second or more and 60 seconds or less, more preferably 10 seconds or more and 50 seconds or less.
When the time is equal to or longer than the lower limit, the resin composition can be brought into contact with the fine concave-convex structure of the development pattern metal plate at high pressure for a longer time while maintaining the resin composition in a molten state. This makes it possible to more stably obtain the housing 100 with even better bonding strength.
Moreover, since the molding cycle of the housing|casing 100 can be shortened as the said time is below the said upper limit, the housing|casing 100 can be obtained more efficiently.

In the method for manufacturing the housing 100 according to the present embodiment, in step (2), the resin composition may be injected into the mold so that the resin member is not joined to the boundary line 205 between the plates. preferable.
By doing so, it is possible to obtain the development diagram-like metal-resin bonded plate 20 in which the resin member is not bonded to the boundary line 205 between the plates, and as a result, the boundary line 205 between the plates is removed. It becomes easier to bend, and it becomes easier to make the developed metal-resin joint plate 20 into a box shape. Therefore, the productivity of the housing 100 can be further improved.

(Step (3))
Next, by bending the board-to-board boundary line 205 to form the developed metal-resin bonded board 20 into a box shape, the housing 100 is obtained.
A method for making the developed metal-resin joint plate 20 into a box shape is not particularly limited, and generally known methods can be used. For example, the housing 100 is obtained by bending the boundary line 205 between the plates and attaching the cover plate 203 as necessary.
At this time, the adjacent side plates 202 and the lid plate 203 connected to the side plates 202 as necessary may be engaged by mechanical means. Examples of the mechanical engagement means include, but are not particularly limited to, screws.

[Electronic device]
An electronic device according to this embodiment includes the housing according to this embodiment and electronic components housed in the housing. The electronic components housed in the housing are not particularly limited, and examples thereof include circuit boards, semiconductor devices, and electronic devices.
The electronic device in which electronic components are housed in the housing according to the present embodiment is not particularly limited, but for example, in-vehicle devices represented by audio devices, in-vehicle mobile telephone devices, car navigation devices, in-vehicle cameras, drive recorders, etc. is mentioned.

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than those described above can also be adopted.

REFERENCE SIGNS LIST 10 metal-resin joint plate 11 metal member 11A first surface 11B second surface 17A first resin member 17B second resin member 20 developed metal-resin joint plate 100 housing 104 joint surface 201 bottom plate 202 side plate 202-1 side plate 202 -2 Side plate 202-3 Side plate 202-4 Side plate 203 Lid plate 205 Boundary part 207 Opening part 209 Slit 301 Resin member

Claims (11)

A metal-resin bonding plate used for a housing containing electronic components,
a plate-shaped metal member for forming a housing wall;
a first resin member bonded to the first surface of the metal member;
a second resin member bonded to a second surface of the metal member opposite to the first surface;
with
The first resin member and the second resin member are arranged asymmetrically with respect to the plate surface of the metal member,
The first resin member and the second resin member are arranged such that the first stress applied to the metal member by the first resin member and the second stress applied to the metal member by the second resin member are offset. is composed of
Both the first resin member and the second resin member are formed in a frame shape on the surface of the metal member, respectively,
The metal-resin joint plate, wherein the first resin member and the second resin member are resin members for reinforcing the strength of the metal member. The metal-resin bonded plate according to claim 1,
Let S1 be the total area of the joints between the _first resin member and the metal member,
Let S2 be the total area of the joints between the _second resin member and the metal member,
The average height of the _first resin member is H1,
When the average height of the _second resin member is H2,
A metal-resin bonded plate that satisfies the following requirements (A) or (B).
(A) S ₁ >S ₂ and H ₁ <H ₂
(B) S ₁ <S ₂ and H ₁ >H ₂ 3. The metal-resin bonded plate according to claim 1,
A metal-resin bonded plate, wherein the first resin member and the second resin member have the same resin composition. A metal-resin bonding plate used for a housing containing electronic components,
a plate-shaped metal member for forming a housing wall;
a first resin member bonded to the first surface of the metal member;
a second resin member bonded to a second surface of the metal member opposite to the first surface;
with
The first resin member and the second resin member are arranged asymmetrically with respect to the plate surface of the metal member,
The first resin member and the second resin member are arranged such that the first stress applied to the metal member by the first resin member and the second stress applied to the metal member by the second resin member are offset. is composed of
Let S1 be the total area of the joints between the _first resin member and the metal member,
Let S2 be the total area of the joints between the _second resin member and the metal member,
Let the coefficient of thermal expansion of the _first resin member be X1,
When the coefficient of thermal expansion of the _second resin member is X2,
A metal-resin bonded plate that satisfies the following requirement (C) or (D).
(C) S ₁ >S ₂ and X ₁ <X ₂
(D) S ₁ <S ₂ and X ₁ >X ₂ A metal-resin bonding plate used for a housing containing electronic components,
a plate-shaped metal member for forming a housing wall;
a first resin member bonded to the first surface of the metal member;
a second resin member bonded to a second surface of the metal member opposite to the first surface;
with
The first resin member and the second resin member are arranged asymmetrically with respect to the plate surface of the metal member,
The first resin member and the second resin member are arranged such that the first stress applied to the metal member by the first resin member and the second stress applied to the metal member by the second resin member are offset. is composed of
Let the coefficient of thermal expansion of the _first resin member be X1,
Let the coefficient of thermal expansion of the _second resin member be X2,
The average height of the _first resin member is H1,
When the average height of the _second resin member is H2,
A metal-resin bonded plate that satisfies the following requirements (E) or (F).
(E) H ₁ >H ₂ and X ₁ <X ₂
(F) H ₁ <H ₂ and X ₁ >X ₂ 6. The metal-resin bonded plate according to claim 4,
A metal-resin joint plate in which the first resin member and the second resin member have different resin compositions. The metal-resin bonding plate according to any one of claims 4 to 6,
A metal-resin joint plate, wherein at least a part of the first resin member and the second resin member are respectively formed in a frame shape on the surface of the metal member. The metal-resin bonding plate according to any one of claims 1 to 7,
The metal member has a fine concavo-convex structure on at least a joint surface of the first resin member and the second resin member,
A metal-resin joint plate in which a part of the first resin member and a part of the second resin member are respectively located in the fine concave-convex structure. The metal-resin bonded plate according to any one of claims 1 to 8,
The metal-resin bonding plate is a metal-resin bonding plate having a planar structure in which the casing is developed. A housing comprising the metal-resin bonding plate according to any one of claims 1 to 9. An electronic device comprising the housing according to claim 10 and an electronic component housed in the housing.

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