JP2017059793A - Housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing capable of enhancing torsional rigidity and flexural rigidity, while achieving the tinning and weight saving.SOLUTION: A housing 1 includes a top cover 4, a bottom cover 2 standing toward the top cover 4, where the peripheral portion has a standing wall 22 bonded to the top cover 4, and a reinforcement member 3 placed in a space sectioned by the top cover 4 and bottom cover 2, and having an opening. The reinforcement member 3 is bonded to the bottom cover 2, and the bottom cover 2 has a thickness in the range of 0.1-0.8 mm, and is formed of a material having a modulus of elasticity in the range of 20-120 GPa.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a housing (electronic device housing) containing an electronic device component, a housing such as an attache case and a carry case.

  In recent years, high rigidity has been demanded for a housing in order to reduce the thickness and weight of an electronic device, improve portability, and prevent damage to components inside the electronic device. Specifically, when the electronic device is gripped with one hand and operated with the other hand, a biased load is applied when the electronic device is transported or when the monitor is opened or closed. . Similarly, if the electronic device is accidentally dropped during transportation, a force in the twisting direction is applied. For this reason, the housing is required to have high torsional rigidity. In addition, when pressure is applied to the housing in a tight place such as a crowded train, or when an object is dropped (when a load is applied in the thickness direction), internal electronic components and displays Since liquid crystal parts such as glass components, particularly glass members, may be damaged, it is required that the housing has a high flexural rigidity. Against this background, many techniques for increasing the rigidity of the casing have been proposed.

  Specifically, Patent Document 1 discloses that the rigidity of a cabinet structure of an electric device including a resin-made lower case having upper and lower electric device mounting surfaces and an upper case having a front wall overlapping the upper electric device mounting surface is enhanced. The invention has been described. Patent Document 2 describes an invention in which the rigidity of the casing of the electronic device is increased by bringing the tip of a rib formed on the inner surface of the first casing into contact with the inner surface of the second casing.

Japanese Patent Laid-Open No. 10-15280 JP 2011-22848 A

  However, in the inventions described in Patent Documents 1 and 2, since the casing is formed of a resin material, it is not possible to provide a casing having a torsional rigidity and a flexural rigidity as large as required in the market. In the inventions described in Patent Documents 1 and 2, it is conceivable that the casing is formed of a metal plate. However, in the inventions described in Patent Documents 1 and 2, the casing is formed by joining or abutting members. For this reason, even if the casing is formed of a metal plate, it is not possible to provide a casing having a torsional rigidity of a size required in the market. In addition, when the casing is formed of a metal plate, the weight of the casing increases, and the market needs cannot be met from the viewpoint of light weight.

  As described above, according to the conventional techniques for increasing the rigidity of the casing, it is impossible to impart high torsional rigidity and flexural rigidity to the casing while realizing a reduction in thickness and weight. For this reason, it has been expected to provide a technology capable of imparting high torsional rigidity and flexural rigidity to the housing while realizing a reduction in thickness and weight.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a housing capable of improving torsional rigidity and flexural rigidity while realizing reduction in thickness and weight.

  The housing according to the first aspect of the present invention includes a top cover, a bottom cover that is erected toward the top cover, and that has a standing wall part with a peripheral edge joined to the top cover; A reinforcing member having an opening disposed in a space defined by the top cover and the bottom cover, wherein the reinforcing member is joined to the bottom cover, and the bottom cover However, it is characterized by being formed of a material having a thickness in the range of 0.1 mm or more and 0.8 mm or less and an elastic modulus in the range of 20 GPa or more and 120 GPa or less.

  The housing according to the first aspect of the present invention is characterized in that, in the above invention, the bottom cover is formed of a fiber-reinforced composite material obtained by curing a laminate of prepregs made of reinforcing fibers and a matrix resin. .

  The housing according to the second aspect of the present invention includes a top cover, a bottom cover that is erected toward the top cover, and has a standing wall portion whose peripheral edge is joined to the top cover; A reinforcing member having an opening disposed in a space defined by the top cover and the bottom cover, wherein the reinforcing member is joined to the bottom cover, and the bottom cover Is formed of a fiber-reinforced composite material obtained by curing a laminate of prepregs composed of reinforcing fibers and a matrix resin.

  The housing according to the present invention is the above-described invention, wherein the reinforcing member is formed of a material having a thickness in the range of 0.3 mm or more and 0.8 mm or less and an elastic modulus in the range of 20 GPa or more and 120 GPa or less. It is characterized by being.

  The housing according to the present invention is characterized in that, in the above invention, the reinforcing member is formed of a fiber reinforced composite material obtained by curing a laminate of a prepreg composed of reinforcing fibers and a matrix resin.

  The housing according to the present invention is characterized in that, in the above invention, the reinforcing member is joined to the bottom cover by thermal welding.

Housing according to the present invention, in the above invention, the reinforcing member may peel load 60N / cm ² or more at 23 ° C., it becomes 5000N / cm ² within the following range and the peeling force at 200 ° C. It is characterized by being joined to the bottom cover so as to be within a range of less than 60 N / cm ² .

  The housing according to the present invention is characterized in that, in the above invention, the reinforcing member and the bottom cover are directly joined.

  The housing according to the present invention is the above-described invention, wherein the projected area of the reinforcing member in the direction of the bottom cover or the top cover joined to the reinforcing member is equal to the bottom face where the reinforcing member is joined. It is in the range of 60% or more and 95% or less of the area of the cover or the top cover.

  In the case according to the present invention, the volume of the hollow structure formed by joining the reinforcing member to the bottom cover or the top cover is 55% or more and 95% or less of the volume of the space. It is in the range of.

  The housing according to the present invention is the hollow structure formed by joining the reinforcing member and the bottom cover or the top cover in the above invention, wherein the heat generating member is the hollow structure side surface of the reinforcing member. It is characterized by being arranged.

  According to the housing according to the present invention, it is possible to improve torsional rigidity and flexural rigidity while realizing reduction in thickness and weight.

FIG. 1 is a perspective view showing a configuration of a housing according to the first embodiment of the present invention. 2 is an exploded perspective view of the housing shown in FIG. FIG. 3 is a cross-sectional view illustrating an example of the configuration of the reinforcing member. FIG. 4 is a cross-sectional view showing an example of the configuration of the reinforcing member shown in FIG. FIG. 5 is a cross-sectional view showing an example of the configuration of the reinforcing member shown in FIG. FIG. 6 is a cross-sectional view illustrating an example of the configuration of the housing. FIG. 7 is a plan view and a cross-sectional view showing the configuration of another reinforcing member. FIG. 8 is a schematic diagram for explaining a torsional rigidity test method. FIG. 9 is a schematic diagram for explaining a method of a flexural rigidity test. FIG. 10 is a schematic diagram for explaining a method of a peeling load test. FIG. 11 is a schematic diagram showing the configuration of the laminate. FIG. 12 is a schematic diagram for explaining the press molding method. FIG. 13 is a schematic diagram for explaining the press molding method. FIG. 14 is a schematic diagram for explaining a method for manufacturing the housing. FIG. 15 is a cross-sectional view for explaining that a reinforcing member is thermally welded to the bottom cover of the tenth embodiment using a joining jig.

  Hereinafter, a housing according to a first embodiment of the present invention will be described with reference to FIGS. Examples of the use of the case of the present invention include an attache case, a carry case, an electronic device case containing electronic device parts, and more specifically, a speaker, a display, an HDD, a notebook computer, and a mobile phone. , Digital still cameras, PDAs, plasma displays, televisions, lighting, refrigerators, and game machines. Among them, it is preferable for clamshell computers and tablet computers that have high torsional rigidity and require lightweight and thin walls. Used.

  FIG. 1 is a perspective view showing a configuration of a housing according to the first embodiment of the present invention. As shown in FIG. 1, a housing 1 according to a first embodiment of the present invention includes a bottom cover 2 having a rectangular shape in plan view, a reinforcing member 3 having an opening joined to the bottom cover 2, and a plan view. A rectangular top cover 4 is provided as a main component. In the following, the direction parallel to the short sides of the bottom cover 2 and the top cover 4 is in the x direction, and the direction parallel to the long sides of the bottom cover 2 and the top cover 4 is perpendicular to the y direction, the x direction, and the y direction. Is defined as the z direction (vertical direction).

  FIG. 2 is an exploded perspective view of the housing 1 shown in FIG. As shown in FIG. 2, the bottom cover 2 includes a planar portion 21 having a rectangular shape in plan view parallel to the xy plane, and a standing wall portion 22 erected in the + z direction from the peripheral portion of the planar portion 21. I have. In addition, the thickness of the member which forms the bottom cover 2 exists in the range of 0.1 mm or more and 0.8 mm or less. The elastic modulus of the member forming the bottom cover 2 is in the range of 20 GPa or more and 120 GPa or less.

  Moreover, it is desirable that the bottom cover 2 is formed of any one of a metal material and a fiber reinforced composite material, and may be formed by combining these. From the viewpoint of expressing high torsional rigidity, the bottom cover 2 is preferably a seamless member formed of the same material. Further, from the viewpoint of productivity, the flat portion 21 having a simple shape is formed using a metal material or a fiber-reinforced composite material having high mechanical properties, and the standing wall portion 22 and the joint portion having a complicated shape are excellent in moldability. The resin material may be formed by injection molding or the like.

  As the metal material, it is desirable to use a light metal material such as an aluminum alloy, a magnesium alloy, or a titanium alloy. Examples of aluminum alloys include Al-Cu A2017, A2024, Al-Mn A3003, A3004, Al-Si A4032, Al-Mg A5005, A5052, A5083, Al-Mg-Si A6061, Examples thereof include A6063 and Al—Zn-based A7075. Examples of the magnesium alloy include Mg-Al-Zn-based AZ31, AZ61, and AZ91. Ti alloys corresponding to 11 to 23 kinds of palladium added alloys, cobalt and palladium added alloys, 50 kinds (α alloy), 60 kinds (α-β alloy), and 80 kinds (β alloy) -6Al-4V etc. can be illustrated.

  Fibers such as carbon fiber, glass fiber, aramid fiber, boron fiber, PBO fiber, high-strength polyethylene fiber, alumina fiber, and silicon carbide fiber can be used as the reinforcing fiber used in the fiber-reinforced composite material. A mixture of two or more of them may be used. These reinforcing fibers can be used as fiber structures such as long fibers aligned in one direction, a single tow, a woven fabric, a knit, a non-woven fabric, a mat, and a braid.

  Matrix resins include thermosetting resins such as epoxy resins, phenol resins, benzoxazine resins, and unsaturated polyester resins, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate. Polyester resins such as phthalate and liquid crystal polyester, polyolefins such as polyethylene (PE), polypropylene (PP) and polybutylene, styrene resins and urethane resins, polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyphenylene sulfide (PPS), polyphenylene ether (PPE), modified PPE, polyimide ( I), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU), modified PSU, polyethersulfone (PES), polyketone (PK), polyetherketone (PEK), polyetheretherketone (PEEK) Thermosetting resins such as polyether ketone ketone (PEKK), polyarylate (PAR), polyether nitrile (PEN), phenolic resin, and phenoxy resin can be used. From the viewpoint of productivity and mechanical properties, it is desirable to use a thermosetting resin, and it is particularly desirable to use an epoxy resin. From the viewpoint of moldability, it is better to use a thermoplastic resin. Among them, a polyamide resin from the viewpoint of strength, a polycarbonate resin from the viewpoint of impact resistance, a polypropylene resin from the viewpoint of lightness, and a heat resistance viewpoint. It is desirable to use polyphenylene sulfide resin. The resin may be used not only as a matrix resin of a fiber reinforced composite material but also as a bottom cover, a top cover, or a reinforcing member made of the resin itself.

  In the present invention, it is desirable from the viewpoint of handleability such as lamination to use the prepreg composed of the above-described reinforcing fiber and matrix resin as the material of each member. From the viewpoint of high mechanical properties and design freedom, it is desirable to use a unidirectional continuous fiber prepreg, and from the viewpoint of isotropic mechanical properties and moldability, it is desirable to use a woven prepreg. Moreover, you may be comprised by the laminated body of these prepregs.

  The reinforcing member 3 is a member having an opening. Specifically, the reinforcing member 3 includes a planar portion 31 having a rectangular shape in plan view parallel to the xy plane, and a standing wall portion 32 erected from the peripheral portion of the planar portion 31 in the −z direction. ing. An electronic device may be loaded on the surface of the flat surface portion 31 facing the flat surface portion 21 of the bottom cover 2. The reinforcing member 3 is joined to the bottom cover 2 in a state where a hollow structure S1 is formed between the planar part 31 and the planar part 21 of the bottom cover 2 by joining to the planar part 21 of the bottom cover 2. The “reinforcing member having an opening” as used herein refers to a shape having an opening in a part of the reinforcing member, and includes a planar portion and a standing wall portion as shown in FIGS. 3 (a) and 3 (b). A member having a surface connecting them or a member having a curved surface may be used. Moreover, as shown in FIG. 3C, an example of the reinforcing member having an opening is a flat portion, a standing wall portion standing on the peripheral portion of the flat portion, and a joint portion extending from the peripheral portion of the standing wall portion. Or a reinforcing member having a curved surface portion and a joint portion extending from the peripheral edge portion of the curved surface portion.

The bonding area in a plane parallel to the xy plane is desirably in the range of 10 cm ² or more and 100 cm ² or less. Specifically, when the bonding area is less than 10 cm ² , when a load with a large deformation is applied to the housing 1, the reinforcing member 3 is peeled off from the bottom cover 2, and the original torsional rigidity cannot be expressed. On the other hand, when the joining area is larger than 100 cm ^2, problems such as an increase in the weight of the casing 1 and a decrease in the volume of the hollow structure S1 occur as the joining area increases. For this reason, it is desirable that the bonding area be in the range of 10 cm ² or more and 100 cm ² or less.

  The maximum value of the distance (height of the reinforcing member 3 from the flat surface portion 21) h between the flat surface portion 31 of the reinforcing member 3 and the flat surface portion 21 of the bottom cover 2 is in the range of 3 mm or more and 30 mm or less. Is desirable. In the present invention, the height h of the reinforcing member 3 is one factor that develops torsional rigidity. For this reason, when the maximum value of the distance h is less than 3 mm, the effect of the standing wall part 32 is small in the housing 1, and the problem that the original torsional rigidity cannot be expressed arises. On the other hand, when the maximum value of the distance h is longer than 30 mm, it is necessary to increase the thickness of the standing wall portion 32, resulting in a problem of an increase in the weight of the housing 1. For this reason, it is desirable that the maximum value of the distance h be in the range of 3 mm or more and 30 mm or less.

  4 and 5 are cross-sectional views showing an example of the configuration of the reinforcing member 3 shown in FIG. As shown in FIG. 4A, the joint portion 33 may be provided so as to extend from the peripheral portion of the standing wall portion 32 in the outward direction parallel to the xy plane. Further, as shown in FIG. 4B, the joint portion 33 may be provided so as to extend in the inward direction parallel to the xy plane from the peripheral portion of the standing wall portion 32. Further, as shown in FIGS. 5A and 5B, the angle α of the standing wall portion 32 with respect to the flat portion 21 of the bottom cover 2 (or the joint portion 33 of the reinforcing member 3) is 45 ° or more and 135 ° or less. It is desirable to be within the range. 5A shows a state where the angle α of the standing wall portion 32 is an acute angle, and FIG. 5B shows a state where the angle α of the standing wall portion 32 is an obtuse angle.

  FIG. 6 is a cross-sectional view illustrating an example of the configuration of the housing. As shown in FIGS. 6A and 6B, the heating members D1 and D2 are disposed in the hollow structure S1 formed by joining the reinforcing member 3 and the bottom cover 2 or the top cover 4 together. . The heating members D1 and D2 are desirably disposed on the surface of the reinforcing member 3 on the hollow structure S1 side. By setting it as such a structure, the distance between the bottom face cover 2 and the heat generating members D1 and D2 which the user of an electronic device touches can be separated, and the temperature rise of the bottom face cover 2 can be suppressed. In the present specification, the “heat generating member” means a part that generates heat as the electronic device is operated, and particularly indicates a member that increases in temperature by 10 ° C. or more as the electronic device is operated. Examples of such a heat generating member include an LED, a capacitor, an inverter, a reactor element, a thermistor element, a power transistor element, a motor, a CPU, and an electronic board on which these are mounted.

  The bending rigidity may be increased by disposing another reinforcing member in the hollow structure S <b> 1 formed between the flat portion 31 of the reinforcing member 3 and the flat portion 21 of the bottom cover 2. Fig.7 (a) shows the top view which shows the structure of another reinforcement member, FIG.7 (b) shows the AA sectional view taken on the line of Fig.7 (a). As shown in FIGS. 7A and 7B, another reinforcing member 5 is a member arranged to extend in the x direction at the center in the y direction of the hollow structure S1, and is a flat portion of the bottom cover 2. 21 and the flat portion 31 of the reinforcing member 3. By integrating the flat surface portion 21 of the bottom cover 2 and the flat surface portion 31 of the reinforcing member 3 via another reinforcing member 5, the bottom surface cover 2 and the reinforcing member 3 are deformed synchronously when a load is applied. Therefore, the bending rigidity of the housing 1 can be improved. Further, the standing wall portion 22 of the bottom cover 2 and the standing wall portion 32 of the reinforcing member 3 and the other reinforcing member 5 are integrated, so that the standing wall portion of the bottom cover 2 and the reinforcing member 3 is particularly an electric casing. 1 becomes difficult to be deformed in the inner direction, and the torsional rigidity of the housing 1 can be improved.

  The other reinforcing member 5 is disposed so as to extend in the y direction at the center in the x direction of the hollow structure S1 as long as it is connected to the flat portion 21 of the bottom cover 2 and the flat portion 31 of the reinforcing member 3. The member may be a member arranged so as to extend in the diagonal direction of the hollow structure S1. In particular, the other reinforcing member 5 is preferably arranged so as to pass through a position where the amount of deflection of the flat portion 21 of the bottom cover 2 increases when a load is applied in the thickness direction. May be arranged, and members may cross each other. Further, it is desirable that the other reinforcing member 5 be formed of an impact absorbing material having excellent elasticity such as a resin material having an elastomer or a rubber component, gel, and the like. The effect can also be expressed.

  In the present embodiment, the standing wall portion 32 may be omitted by using the flat surface portion 31 as a curved member. Moreover, the uneven | corrugated shape may be formed in the plane part 31 from a viewpoint which raises rigidity, or a viewpoint which utilizes space effectively. In the present embodiment, the reinforcing member 3 is joined to the bottom cover 2, but the reinforcing member 3 is joined to the top cover 4, and the space between the flat surface portion 31 of the reinforcing member 3 and the top cover 4. A hollow structure S1 may be formed on the substrate.

In the present embodiment, the joint portions 33 are formed on all of the four standing wall portions 32 formed for each side of the plane portion 31, but the joint portion 33 is formed on at least one of the four standing wall portions 32. Should just be formed. Moreover, the junction part 33 may be formed in two or more standing wall parts 32 adjacent among the four standing wall parts 32. In addition, the area of the joint portion 33 formed on one standing wall portion 32 is desirably 1 cm ² or more. Further, the thickness of the member forming the reinforcing member 3 is preferably in the range of 0.3 mm or more and 1.0 mm or less from the viewpoint of weight reduction and thickness reduction of the housing. The elastic modulus of the member forming the reinforcing member 3 is preferably in the range of 20 GPa or more and 120 GPa or less.

  The reinforcing member 3 is preferably formed of any one of the above-described metal material and fiber-reinforced composite material, and the material can be selected according to the purpose of the reinforcing member 3. That is, from the viewpoint of exhibiting a high reinforcing effect, it is preferable to use a metal material or fiber reinforced composite material having a high elastic modulus. From the viewpoint of developing (antenna properties), it is preferable to use a resin or glass fiber reinforced composite material that is a non-conductive material. From the viewpoint of developing electromagnetic shielding properties (radio wave shielding properties), a metal that is a conductive material. A material or a carbon fiber composite material may be used. Furthermore, when the reinforcing member 3 is formed of a fiber reinforced composite material, it is desirable that the reinforcing member 3 is constituted by a laminated body of continuous fiber prepregs. Moreover, it is desirable that the ratio of the linear expansion coefficient of the reinforcing member 3 to the linear expansion coefficient of the bottom cover 2 to which the reinforcing member 3 is joined is in the range of 0.1 or more and 10 or less.

Further, it is desirable that the reinforcing member 3 is joined to the flat portion 21 of the bottom cover 2 by heat welding. 23 peel load at ℃ is 60N / cm ² or more, it is desirable in the 5000N / cm ² within the range, 100 N / cm ² or more, and more preferably in the 5000N / cm ² within the following ranges. Examples of the heat welding method include an insert injection method, an outsert injection method, a vibration welding method, an ultrasonic welding method, a laser welding method, and a hot plate welding method. In this case, it is desirable that the adhesive surface between the reinforcing member 3 and the flat portion 21 has a peeling load at 200 ° C. of less than 60 N / cm ² . The peeling load at 200 ° C. is more preferably 30 N / cm ² or less.

Moreover, it is desirable that this peeling load is less than 60 N / cm ^{2 at} 180 ° C., and that it can be easily peeled off at a lower temperature range, from the viewpoint of dismantling adhesion. However, when the temperature for disassembling is low, the reinforcing member may be peeled off when used as a casing due to a temperature rise associated with the operation of the electronic component or the temperature of the usage environment. Therefore, it is desirable that the reinforcing member is bonded with high adhesive strength in the temperature range in which the housing is used, and that it can be easily peeled off in the temperature range where the housing is disassembled. Therefore, the peeling load at 80 ℃ 60N / cm ² or more, and more preferably in the 5000N / cm ² within the following ranges.

In addition, the peeling load at 200 ° C. is desirably as low as possible, and is most desirably 10 N / cm ² or less. The preferred because the lower limit as low peel force at 200 ° C. is not particularly limited, but is preferably 0N / cm ² or more, because sometimes inferior in handling properties too low, with 1N / cm ² or more More preferably. By adopting such a configuration, it is possible to develop dismantling adhesiveness that allows the reinforcing member 3 to be easily removed, and it is possible to facilitate repair and recycling of the electronic device. Further, the reinforcing member 3 and the bottom cover 2 to which the reinforcing member 3 is joined are formed of a fiber reinforced composite material, and a thermoplastic resin is provided on at least one joining portion of the reinforcing member 3 and the bottom cover 2. It is desirable that the bottom cover 2 and the bottom cover 2 are joined via a thermoplastic resin.

  As a method of providing the thermoplastic resin at the joint portion, the reinforcing member 3 and the bottom cover 2 to which the reinforcing member 3 is joined using a fiber reinforced sheet (prepreg sheet) using a thermoplastic resin as a matrix resin or the top cover. A method obtained by molding the face cover 4 may be mentioned. Since the molded body obtained by this method has a high proportion of thermoplastic resin on the surface, it is possible to have a wide adhesion area during bonding, and the degree of freedom of selection of the bonding location is increased. preferable. From the viewpoint of the mechanical properties of each member, it is preferably a fiber-reinforced composite material using a thermosetting resin as a matrix resin. As a method of providing a thermoplastic resin on such a member, the thermoplastic resin is heated. There is a method in which a melted melt or a solution obtained by dissolving a thermoplastic resin with a solvent is applied to provide the fiber reinforced composite material with the thermoplastic resin. When a fiber reinforced sheet (prepreg sheet) using a thermosetting resin as a matrix resin is molded and cured, a film or nonwoven fabric made of a thermoplastic resin is laminated on the outermost layer of the fiber reinforced sheet (prepreg sheet). Examples of the method include heating and pressure forming the laminated body.

  Further, it is desirable that the reinforcing member 3 and the bottom cover 2 or the top cover 4 are directly joined. By using a fiber-reinforced composite material having a thermoplastic resin at the joint between the reinforcing member 3 and / or the bottom surface cover 2 or the top surface cover 4 to be bonded to the reinforcing member 3, it is not necessary to use an adhesive other than each member. Since it becomes possible to join each member directly, the weight increase of the housing | casing 1 can be suppressed. A suitable method for directly joining the reinforcing member 3 and the bottom cover 2 or the top cover 4 is made of a thermoplastic resin in the outermost layer of a fiber reinforced sheet (prepreg sheet) using a thermosetting resin as a matrix resin. In this method, a laminate in which a film or a non-woven fabric is laminated on the surface is used, but the thermoplastic resin used here can be selected from the group of thermoplastic resins exemplified as the matrix resin.

  Preferably, it is preferable to select a thermoplastic resin having a melting point lower than a molding temperature for molding and curing a fiber reinforced sheet (prepreg sheet) whose matrix resin is made of a thermosetting resin. Although the minimum of melting | fusing point of a thermoplastic resin is not specifically limited, From a viewpoint of expressing the heat resistance at the time of applying the housing | casing of this invention to an electronic device, 80 degreeC or more is preferable and 100 degreeC or more is more preferable. The form of the thermoplastic resin is not particularly limited, and examples thereof include films, continuous fibers, woven fabrics, particles, and non-woven fabrics. From the viewpoint of handleability during the molding operation, it is preferable to be in the form of a film and non-woven fabric. . By selecting such a resin, the thermoplastic resin melts at the time of molding, and the thermoplastic resin spreads like a film on the surface of the molded body. By impregnating the reinforcing fibers to form a strong thermoplastic resin layer, it becomes possible to exhibit high peel strength. At least one of the reinforcing member 3 obtained by these methods and the bottom cover 2 or the top cover 4 to be joined to the reinforcing member 3 may be used, but a thermoplastic resin is provided on both joining members to be joined. Preferably it is. Moreover, as for the provided thermoplastic resin, it is desirable that the substantially same thermoplastic resin is mutually selected.

  In this specification, “disassembly adhesive” includes not only that the reinforcing member 3 can be easily removed but also that it can be reattached, and exhibits adhesiveness during reattachment. For this purpose, a thermoplastic resin may be added, but it is preferable that the resin can be reattached without increasing the weight of the thermoplastic resin or the like. Further, the peeling load upon re-adhesion is preferably 50% or more, more preferably 70% or more of the original peeling load. The dismantling adhesion of the present invention joins the characteristics of thermoplastic resin, the point that the resin melts by heating and the mechanical characteristics decrease, and the characteristic that expresses the original high mechanical characteristics by cooling or solidifying at room temperature. This was achieved by adapting to technology.

  In addition, an opening can be formed in the flat portion 31 and the standing wall portion 32 of the reinforcing member 3 as long as the torsional rigidity of the present invention is improved. By adopting such a structure, it corresponds to the electronic component and the top cover 4 arranged in a space other than the hollow structure S1 defined by the electronic component built in the hollow structure S1, the bottom cover 2 and the top cover 4. It is possible to arrange a wiring cable for connecting a display, a keyboard, and the like. The opening is preferably formed in an arrangement for improving the air flow from the viewpoint of heat dissipation, for example, in the opposing standing wall 32. These apertures are desirably 30% or less with respect to the surface area of the reinforcing member 3, and more desirably 15% or less from the viewpoint of torsional rigidity.

  The top surface cover 4 is joined to the peripheral edge portion of the standing wall portion 22 of the bottom surface cover 2. In FIG. 1, the top cover 4 has a smooth plate shape, but may have a plate shape having a curved surface or unevenness. Moreover, the top cover 4 may be the same material and shape as the bottom cover 2, and even if the reinforcing member 3 is partitioned by the bottom cover 2 and the top cover 4 and is arranged and joined in the space. The casing 1 having high rigidity with respect to either surface can be obtained by adopting such a configuration. Further, the top cover 4 may be an electronic device part such as a liquid crystal display or a keyboard. With such a configuration, the top cover 4 can be applied to a clamshell personal computer or a tablet personal computer.

  As is apparent from the above description, the housing 1 according to the first embodiment of the present invention is erected toward the top cover 4 and the top cover 4, and the peripheral edge is joined to the top cover 4. A bottom cover 2 having a standing wall portion 21 and a reinforcing member 3 having an opening disposed in a space S1 defined by the top cover 4 and the bottom cover 2. A housing bonded to the bottom cover 2, wherein the bottom cover 2 has a thickness in the range of 0.1 mm to 0.8 mm and an elastic modulus in the range of 20 GPa to 120 GPa. It is formed by. Thereby, it is possible to improve the torsional rigidity and the flexural rigidity while realizing a reduction in thickness and weight.

  The housing 1 according to the second embodiment of the present invention includes a top cover 4 and a standing wall portion 21 that is erected toward the top cover 4 and has a peripheral edge joined to the top cover 4. And a reinforcing member 3 having an opening disposed in a space S1 defined by the top cover 4 and the bottom cover 2, and the reinforcing member 3 is joined to the bottom cover 2. The bottom cover 2 is formed of a fiber-reinforced composite material obtained by curing a laminate of prepregs made of reinforcing fibers and a matrix resin. Thereby, it is possible to improve the torsional rigidity and the flexural rigidity while realizing a reduction in thickness and weight.

  Note that the reinforcing member 3 may be configured by a member having an opening, and the reinforcing member 3 may be joined to the bottom cover 2 or the top cover 4 to form the hollow structure S1. In this case, the projected area of the reinforcing member 3 in the direction of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined is the projected area of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined. It is desirable to adjust within the range of 60% or more and 95% or less. The arrangement position of the reinforcing member 3 is not particularly limited, but is preferably located at an equal position from the center position C of the bottom cover 2 or the top cover 4. By adopting such an arrangement, the x direction or y The torsional rigidity in the direction can be isotropic. Further, from the viewpoint of effectively using a space other than the hollow structure S <b> 1 among the spaces defined by the bottom cover 2 and the top cover 4, the reinforcing member 3 is attached to either the bottom cover 2 or the top cover 4. You may bring it.

  Specifically, when the projected area of the reinforcing member 3 is less than 60% of the area of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined, the standing wall that contributes to the torsional rigidity of the present invention. The portion is formed at a position close to the center position of the bottom cover 2 or the top cover 4, and there arises a problem that the original torsional rigidity cannot be expressed. On the other hand, when the projected area S of the reinforcing member 3 is larger than 95% of the area of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined, high torsional rigidity can be expressed, but other than the hollow structure S1. Since the space of the space becomes small, it is difficult to arrange electronic components and wirings for configuring the electronic device, and it becomes difficult to adapt as a housing. For this reason, the projected area in the direction of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined is 60% or more of the area of the bottom cover 2 or the top cover 4 to which the reinforcing member 3 is joined, It is desirable to be within the range of 95% or less.

  At this time, the shape of the projection surface of the reinforcing member 3, that is, the shape of the flat surface portion 31 is not particularly limited, but may be a circular shape or a polygonal shape other than the rectangular shape, and from the viewpoint of developing high deflection rigidity, the bottom cover 2 and / or a shape corresponding to the shape of the top cover 4 is preferable. Specifically, the shape of the projection surface of the reinforcing member 3 is preferably a rectangular shape. Further, from the viewpoint of effectively utilizing the space other than the hollow structure S1 and the hollow structure S1, the shape of the projection surface of the reinforcing member 3 is preferably a shape that matches the shape of the electronic component to be loaded. Further, from the viewpoint of expressing isotropic rigidity with respect to any load, the shape of the projection surface of the reinforcing member 3 is preferably symmetric with respect to the axis in the x direction and / or the y direction.

  In addition, when the reinforcing member 3 is configured by a member having an opening and the hollow member S1 is formed by joining the reinforcing member 3 to the bottom cover 2 or the top cover 4, the reinforcing member 3 of the bottom cover 2 is formed. It is desirable that the volume of the hollow structure S1 formed by the above is in the range of 55% or more and 95% or less of the volume of the space defined by the bottom cover 2 and the top cover 4. Specifically, when the volume of the hollow structure S1 is less than 55% of the volume of the space defined by the bottom surface cover 2 and the top surface cover 4, the height of the standing wall portion that contributes to the torsional rigidity of the present invention. This is a case where the height is low and / or the projected area of the reinforcing member 3 is small, which causes a problem that the original torsional rigidity cannot be expressed. On the other hand, when the volume of the hollow structure S1 is larger than 95% of the volume of the space defined by the bottom cover 2 and the top cover 4, high torsional rigidity can be expressed, but the space other than the hollow structure S1 is small. Thus, there arises a problem that it is difficult to arrange electronic components and wiring for configuring the electronic device, and it is difficult to adapt as a housing. For this reason, it is desirable that the volume of the hollow structure S1 is in the range of 55% or more and 95% or less of the volume of the space defined by the bottom cover 2 and the top cover 4.

  As mentioned above, although embodiment which applied the invention made by the present inventors was described, this invention is not limited by the description and drawing which make a part of indication of this invention by this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

  Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the following examples.

<Evaluation and measurement method>
(1) Torsional rigidity test As shown in FIG. 8A, one side of the housing 1 is fixed with a U-shaped fixing jig 100, and the other side opposite to the fixed side is a supporting jig. After being fixed to the testing machine while being held at 101, the amount of displacement of the housing 1 when a load of 50 N is applied at a change rate of the angle θ of 1 ° / min as shown in FIG. 8B is measured. The measured value was the torsional rigidity value of the casing.

(2) Flexural Rigidity Test As shown in FIG. 9, the casing was installed in the testing machine so that the load F could be applied from the bottom cover 2 or top cover 4 side to which the reinforcing member was joined. An “Instron” (registered trademark) universal testing machine 4201 type (manufactured by Instron) was used as a testing machine. Using the indenter 102 with a diameter of 20 mm, the center position of the housing 1 is pushed at a crosshead speed of 1.0 mm / min, and the amount of deflection of the bottom cover 2 or the top cover 4 when a load of 100 N is applied is measured. The value was defined as a flexural rigidity value.

(3) Evaluation of bending elastic modulus Based on the standard of ASTM D-790 (1997), the bending elastic modulus of the material used for the reinforcing member 3, the bottom cover 2, and the top cover 4 was evaluated. Bending test piece having a width of 25 ± 0.2 mm and a length of span L + 20 ± 1 mm so that the relationship between thickness D and span L is L / D = 16 from each member obtained in the example or comparative example. Was cut out in four directions of 0 °, + 45 °, −45 °, and 90 ° when an arbitrary direction was taken as a 0 ° direction, and test pieces were produced. The number of measurements n for each direction was 5 times, and the average value of all measured values (n = 20) was taken as the flexural modulus. An "Instron" (registered trademark) universal testing machine 4201 type (manufactured by Instron) is used as a testing machine, and a support span is set to a test piece thickness of 16 using a 3-point bending test jig (indenter diameter 10 mm, fulcrum diameter 10 mm). The bending elastic modulus was measured by setting to double. The test piece was tested under the conditions of a moisture content of 0.1% by mass or less, an atmospheric temperature of 23 ° C., and a humidity of 50% by mass.

(4) Peeling load test of reinforcing member (23 ° C and 200 ° C)
The peeling load of the reinforcing member was evaluated based on “Test method of tensile adhesive strength of adhesive” defined in JIS K6849 (1994). As the test piece in this test, the casing obtained in the example or the comparative example was used. At this time, in order to measure the peeling strength of the reinforcing member, evaluation was performed in a state where there is no top cover or bottom cover to which the reinforcing member is not joined (before joining). Specifically, as shown in FIG. 10, the bottom cover 2 or the top cover 4 of the housing 1 is fixed with a fixing jig 103, and the reinforcing member 3 is fixed with a tension jig 104. Then, a tensile load F was applied with each member fixed, and evaluation was performed until the reinforcing member 3 was peeled off or the tensile jig 104 was detached from the reinforcing member 4. The adhesion area at this time was calculated by measuring the width and length of the joining surface of the reinforcing member 3 before joining. When joining was made partially, those areas were measured and added together to obtain the joining area. The peeling load of the reinforcing member 3 was calculated from the obtained tensile load value and the bonding area. Moreover, the peeling load of the reinforcing member 3 at 200 ° C. was set in the thermostatic chamber together with the jig for fixing the housing 1, and the ambient temperature in the thermostatic bath was raised to 200 ° C. After the temperature rise, the state was maintained for 10 minutes, and a tensile load was applied in the same manner as in the peeling load test of the reinforcing member 3 for evaluation.

<Materials used>
The materials used for the evaluation are shown below.

[Material 1]
“Torayca” prepreg P3252S-12 manufactured by Toray Industries, Inc. was prepared as material 1. The properties of Material 1 are shown in Table 1 below.

[Material 2]
SCF183 EP-BL3 manufactured by Super Resin Industry Co., Ltd. was prepared as Material 2. The properties of Material 2 are shown in Table 1 below.

[Material 3]
Aluminum alloy A5052 was prepared as material 3. The properties of Material 3 are shown in Table 1 below.

[Material 4]
Magnesium alloy AZ31 was prepared as material 4. The properties of Material 4 are shown in Table 1 below.

[Material 5]
A terpolymer polyamide resin (“Amilan” (registered trademark) manufactured by Toray Industries, Inc.) and 90% by mass of polyamide 6 resin (“Amilan” (registered trademark) CM1021T manufactured by Toray Industries, Inc.) and polyamide 6/66/610 CM4000) using a master batch consisting of 10% by mass, a thermoplastic resin film having a basis weight of 124 g / m ² was prepared and prepared as Material 5. The properties of Material 5 are shown in Table 1 below.

Example 1
Example 1- (1): Production of bottom cover Seven sheets having a predetermined size were cut out from the material 1. Of these, four sheets were cut so that the fiber direction of the prepreg and the longitudinal direction (x direction in FIG. 1) were parallel, and the remaining three sheets had the fiber direction in the lateral direction (y direction in FIG. 1). It was made parallel. In this embodiment, the lateral direction (y direction) is 0 °, and as shown in FIG. 11, the prepreg sheet 105a having a fiber direction of 90 ° and the prepreg sheet 105b having a fiber direction of 0 ° are symmetrically laminated. A laminate composed of seven prepreg sheets was obtained.

  Here, using a press molding apparatus and a pair of molds 106 as shown in FIG. 12A, the laminate 107 obtained in the pair of molds 106 was disposed. At this time, the hot platen temperature of the press molding machine was set to 150 ° C., and the mold was moved as shown in FIG. . Then, after 30 minutes, the molding die was opened, and the molded product was taken out from the die. Trimming was performed so as to be the height of the obtained molded product, and a bottom cover was obtained.

Example 1- (2): Production of top cover A molded product was obtained in the same manner as in Example 1- (1) except that a mold having a smooth molded product was used. Trimming was performed so that the dimension of the obtained molded product was a desired size, and a top cover was obtained.

Example 1- (3): Production of reinforcing member A molded product was obtained in the same manner as in Example 1- (1) except that a mold 106 as shown in FIG. 13 was used. Trimming was performed so that the joint surface of the obtained molded product had a desired width, and a reinforcing member was obtained.

Example 1- (4): Production of Case Each member obtained in Example 1- (1) to (3) was joined using an adhesive 108 as shown in FIG. The molding conditions and evaluation results in Example 1 are shown in Table 2 below.

(Example 2)
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that a bottom cover having the dimensions shown in Table 2 was molded and used. The molding conditions and evaluation results in Example 2 are shown in Table 2 below.

(Example 3)
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that the materials shown in Table 2 were used as the bottom cover, the hot platen temperature was 220 ° C., and the molding pressure was 10 MPa. . The molding conditions and evaluation results in Example 3 are shown in Table 2 below.

Example 4
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that the materials shown in Table 2 were used as the bottom cover, the hot platen temperature was 200 ° C., and the molding pressure was 10 MPa. . The molding conditions and evaluation results in Example 4 are shown in Table 2 below.

(Example 5)
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that a bottom cover made of the material shown in Table 3 was used. The molding conditions and evaluation results in Example 5 are shown in Table 3 below.

(Example 6)
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that the reinforcing member made of the material shown in Table 3 was used. The molding conditions and evaluation results in Example 6 are shown in Table 3 below.

(Example 7)
As another reinforcing member, 25 sheets of the material 1 were laminated so that the prepreg sheets of 0 ° and the prepreg sheets of 90 ° were alternately laminated so as to have a thickness of 3 mm. In the same manner as in Example 1- (1), heating and pressing were performed with a press molding machine to obtain a molded product. The obtained molded product was processed so as to have a width of 7.2 mm, and another reinforcing member having the dimensions shown in Table 3 was obtained. Another obtained reinforcing member was arranged as shown in FIG. 7 and joined with an adhesive, and the others were the same as in Examples 1- (1) to (4) to obtain a casing. The molding conditions and evaluation results in Example 7 are shown in Table 3 below.

(Example 8)
A casing was obtained in the same manner as in Examples 1- (1) to (4) except that a reinforcing member having the dimensions shown in Table 3 was molded and used. The molding conditions and evaluation results in Example 8 are shown in Table 3 below.

Example 9
Example 1 A hot melt resin (manufactured by Cemedine Co., Ltd.) obtained by melting the bottom cover and the reinforcing member obtained in the same manner as in (1) and (2) with a hot melt applicator at 140 ° C. at the joint of the reinforcing member. HM712) was applied, the reinforcing members were overlapped, and a weight was placed from above, and joined as they were for 3 minutes. A casing was obtained in the same manner as in Examples 1- (1) to (4) except for the joining method. The molding conditions and evaluation results in Example 9 are shown in Table 4 below.

(Example 10)
Example 10- (1): Production of Bottom Cover Film having a thickness of 50 μm made of copolymerized polyamide resin (“Amilan (registered trademark)” CM8000, manufactured by Toray Industries, Inc.) on the side to be joined to the reinforcing member Were laminated to obtain a laminate. A bottom cover was obtained in the same manner as in Example 1- (1) except that the obtained laminate was used.

Example 10- (2): Production of top cover As in Example 10- (1), a copolymerized polyamide resin (“Amilan” manufactured by Toray Industries, Inc.) was formed on the surface to be the joint surface with the bottom cover. ) A film having a thickness of 50 μm made of “CM8000) was laminated to obtain a laminate. A top cover was obtained in the same manner as in Example 1- (2) except that the obtained laminate was used.

Example 10- (3): Production of Reinforcing Member Similar to Example 10- (1), a copolymerized polyamide resin ("Amilan (registered trademark)" manufactured by Toray Industries, Inc. on the surface to be the joint surface with the bottom cover. A film made of “CM8000” and having a thickness of 50 μm was laminated to obtain a laminate. A reinforcing member was obtained in the same manner as in Example 1- (3) except that the obtained laminate was used.

Example 10- (4): Fabrication of casing The bottom cover obtained in Example 10- (1) was overlapped with the reinforcing member obtained in Example 10- (3) on the joining form, as shown in FIG. The joining jig 109 was used and placed in a press molding machine set so that the surface temperature of the joining jig 109 was 180 ° C., and heated and pressurized. After 1 minute, the bottom cover 2, the reinforcing member 3, and the joining jig 109 were removed from the press and cooled. After 5 minutes, the joining jig 109 was removed to obtain an integrated product of the bottom cover 2 and the reinforcing member 3. Then, the housing | casing was obtained like Example 1- (4). The molding conditions and evaluation results in Example 11 are shown in Table 4 below.

(Example 11)
A casing was obtained in the same manner as in Example 10 except that a reinforcing member having the dimensions shown in Table 4 was molded and used. The molding conditions and evaluation results in Example 11 are shown in Table 4 below.

(Examples 12 to 14)
A casing was obtained in the same manner as in Example 10 except that the reinforcing members having the dimensions shown in Tables 4 and 5 were molded and used. The molding conditions and evaluation results in Examples 12 to 14 are shown in Table 4 and Table 5 below.

(Reference Example 1)
A bottom cover and a reinforcing member were obtained in the same manner as in Example 12 except that the dimensions shown in Table 5 were used. Electronic components were placed in the hollow structure S1 and the space S3 formed by the bottom cover and the reinforcing member, and the joint was joined by an ultrasonic welder in the same manner as in Example 30. In addition, a liquid crystal display was prepared as a top cover and joined to the bottom member with a double-sided tape. The molding conditions and evaluation results for the electronic device obtained in Reference Example 1 are shown in Table 5 below.

(Comparative Example 1)
Except not using a reinforcing member, it carried out similarly to Example 1- (1)-(4), and obtained the housing | casing. The molding conditions and evaluation results in Comparative Example 1 are shown in Table 6 below.

(Comparative Example 2)
A casing was obtained in the same manner as in Comparative Example 1 except that the laminate in which the material 1 and the material 2 were laminated was used as the material for the bottom cover. The molding conditions and evaluation results in Comparative Example 2 are shown in Table 6 below.

(Comparative Example 3)
Comparative Example 3- (1): Production of Bottom Cover Using a laminate in which 10 materials shown in Table 6 were laminated, a press molding apparatus, and a pair of molds 106 as shown in FIG. A laminate was placed in the mold 106. At this time, the hot platen temperature of the press molding machine was set to 260 ° C., and pressurization was performed while the molding pressure was maintained at 1.0 MPa. After 10 minutes, cooling water was passed through the hot platen of the press machine, and cooling was started. After the mold temperature reached 100 ° C. or lower, the mold was opened and the molded product was taken out from the mold. Trimming was performed so that the standing wall of the obtained molded product had a desired height, and a bottom cover was obtained.

Comparative Example 3- (2): Production of Reinforcing Member and Top Cover Except that the mold used was changed so as to have the dimensions shown in Table 6, in the same manner as Comparative Example 3- (1), the reinforcing member and I got the top cover.

Comparative Example 3- (3): Production of Case The top cover was joined using an adhesive in the same manner as in Example 1- (4) except that the obtained bottom cover and reinforcing member were used. The molding conditions and evaluation results in Comparative Example 3 are shown in Table 6 below.

[Evaluation]
It was confirmed that the casings obtained in the examples exhibited high torsional rigidity and flexural rigidity. Among them, Example 1 was a housing that can mount many electronic devices or the like inside the hollow structure because the hollow structure has a high ratio while exhibiting very high torsional rigidity. In Example 8, there was also an effect of another reinforcing member, and it was confirmed that not only torsional rigidity but also higher deflection rigidity was exhibited. In Examples 9 to 11, since the bottom cover and the reinforcing member are joined by heat welding, it is possible to disassemble the joint portion by heating while exhibiting high torsional rigidity and flexural rigidity. It is preferable from the viewpoint. In Examples 10 and 11, since the reinforcing member and the bottom cover are directly joined, there is little increase in weight compared to the case where an adhesive, hot melt resin, or the like is used, which is preferable from the viewpoint of weight reduction. .

  In Examples 3 and 4, not only high torsional rigidity but also flexural rigidity was exhibited by using a metal material having high bottom surface mechanical properties. Moreover, since it is also a material with high heat conductivity, it is preferable also from a viewpoint of thermal characteristics. Example 5 is preferable from the viewpoint of enabling radio wave communication as well as high torsional rigidity because a non-conductive material having electromagnetic wave permeability is used for the bottom cover. In the second embodiment, the bottom cover is thinned, and the torsional rigidity is maintained while contributing to weight reduction and thinning of the casing. In Reference Example 1, as a method of utilizing the casing, electronic components were arranged in a hollow structure, and an electronic device was manufactured using a liquid crystal display as a top cover. It was confirmed that by satisfying the requirements of the present invention, it is possible to provide an electronic device that exhibits high torsional rigidity and flexural rigidity.

  On the other hand, Comparative Examples 1 and 2 were casings that were very weak against torsion and could damage internal electronic components. Moreover, although the comparative example 3 uses the reinforcement member, the resin material is used for each member, and the bending rigidity was inferior.

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Bottom cover 3 Reinforcement member 4 Top cover 5 Another reinforcement member 21 Plane part 22 Standing wall part 31 Plane part 32 Standing wall part 33 Joining part

Claims (11)

A space defined by a top surface cover, a bottom surface cover that is erected toward the top surface cover and has a peripheral wall joined to the top surface cover, and the top surface cover and the bottom surface cover. A reinforcing member having an opening disposed therein, wherein the reinforcing member is joined to a bottom cover,
The casing is characterized in that the bottom cover is made of a material having a thickness in a range of 0.1 mm to 0.8 mm and an elastic modulus in a range of 20 GPa to 120 GPa.   The casing according to claim 1, wherein the bottom cover is formed of a fiber reinforced composite material obtained by curing a laminate of a prepreg made of reinforcing fibers and a matrix resin. A space defined by a top surface cover, a bottom surface cover that is erected toward the top surface cover and has a peripheral wall joined to the top surface cover, and the top surface cover and the bottom surface cover. A reinforcing member having an opening disposed therein, wherein the reinforcing member is joined to a bottom cover,
The casing is characterized in that the bottom cover is formed of a fiber reinforced composite material obtained by curing a laminate of a prepreg made of reinforcing fibers and a matrix resin.   The reinforcing member is formed of a material having a thickness in a range of 0.3 mm or more and 0.8 mm or less and an elastic modulus in a range of 20 GPa or more and 120 GPa or less. The housing according to any one of the three.   The casing according to any one of claims 1 to 4, wherein the reinforcing member is formed of a fiber-reinforced composite material obtained by curing a laminate of prepregs made of reinforcing fibers and a matrix resin. .   The casing according to any one of claims 1 to 5, wherein the reinforcing member is joined to the bottom cover by thermal welding. The reinforcing member 23 peel load at ° C. is 60N / cm ² or more, the 5000N / cm ² within the range, and, as the peeling force at 200 ° C. fall within a range of less than 60N / cm ² The housing according to claim 1, wherein the housing is joined to the bottom cover.   The casing according to any one of claims 1 to 7, wherein the reinforcing member and the bottom cover are directly joined.   The projected area of the reinforcing member in the direction of the bottom cover or top cover that is joined to the reinforcing member is 60% or more of the area of the bottom cover or top cover to which the reinforcing member is joined. The casing according to any one of claims 1 to 8, wherein the casing is within a range of 95% or less.   The volume of the hollow structure formed by joining the reinforcing member to the bottom cover or the top cover is in a range of 55% or more and 95% or less of the volume of the space. The housing | casing of any one among 1-9.   The hollow structure formed by joining the reinforcing member and the bottom cover or the top cover, wherein a heat generating member is disposed on the hollow structure side surface of the reinforcing member. The housing | casing of any one among claim | item 1 -10.

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