JP2013179315A - Housing and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing for an electronic apparatus which enables the weight and thickness reduction without deteriorating the rigidity and enables a complicated shape to be easily formed, and to provide a manufacturing method of the housing for the electronic apparatus.SOLUTION: A housing for an electronic apparatus includes: a composite sheet portion formed by a composite sheet 20 formed by sandwiching a porous resin sheet 24 with high rigidity sheets 24, 26 having rigidity higher than that of the resin sheet 24; and a thermoplastic resin portion joined to at least the resin sheet 24 of the composite sheet portion and formed by a thermoplastic resin 30.

Description

  The present invention relates to a housing and a manufacturing method thereof, and more particularly to a housing for an electronic device and a manufacturing method thereof.

  In recent years, information devices such as mobile phones and laptop computers have been required to be smaller, lighter, and thinner from the viewpoint of improving mobility. Along with this, it has become necessary to reduce the weight and thickness of the housing, which is a box for housing the electronic device.

  Usually, a housing of an electronic device is manufactured by a method called a so-called injection molding, in which a molten resin material is filled in a mold and solidified. However, for example, in the LCD portion of a notebook personal computer, it is necessary to achieve a load resistance of 40 kg at a single point, and it has become difficult to maintain sufficient strength with a lightweight and thin resin casing. In addition, the heat density of electronic devices has increased due to the miniaturization, and a housing having higher cooling performance is required.

  In such a background, a casing using a metal or metal alloy such as Al (aluminum) or Mg (magnesium) having high specific strength, low specific gravity, and high thermal conductivity has been proposed. In particular, Mg has a specific gravity that is about 70% lighter than that of Al, and its recyclability is excellent.

  As the resin casing, a casing having improved mobility by using a thermoplastic resin such as PC (polycarbonate) resin or PA (polyamide) resin to which carbon fiber or glass fiber is added has been proposed. In addition to the thermoplastic resin, a resin casing using a prepreg in which a carbon fiber is impregnated in a thermosetting plastic has been proposed.

There has also been proposed a method of forming a casing using a lightweight sandwich plate in which a porous core layer is sandwiched between skin layers and integrated as a whole.
Japanese Patent Laid-Open No. 08-302206 Japanese Patent Laid-Open No. 08-072119

  However, the Mg alloy is difficult to form and has low mass productivity. In addition, the case using the Mg alloy is expensive because the appearance after molding is rough and a process such as putty repair is required.

  In addition, a resin casing using a thermoplastic resin to which carbon fiber or glass fiber is added needs to add 20% to 50% of carbon fiber or glass fiber in order to obtain high strength. Therefore, specific gravity becomes large with 1.3-1.6. Moreover, in order to give a metallic feeling, the coating film thickness must be increased to 30 μm or more, which is expensive.

  In addition, in a resin casing using a prepreg obtained by impregnating a carbon fiber into a thermosetting plastic or a casing using a sandwich plate, a complicated shape such as a boss or a rib cannot be formed.

  An object of the present invention is to provide a housing that can be reduced in weight and thickness without lowering rigidity and that can easily form a complicated shape, and a method for manufacturing the same.

  According to one embodiment of the present invention, a composite sheet portion formed by a composite sheet in which a porous resin sheet is sandwiched between rigid sheets having higher rigidity than the resin sheet, and bonded to at least the resin sheet of the composite sheet portion And a housing having a thermoplastic resin portion formed of a thermoplastic resin.

  Further, according to another aspect of the embodiment, a composite sheet sandwiched between a porous resin sheet and a rigid sheet having rigidity higher than that of the resin sheet is joined to the resin sheet by injection molding of a thermoplastic resin, There is provided a method for manufacturing a casing, which includes a step of forming a thermoplastic resin portion formed of the thermoplastic resin.

  According to the disclosed housing and the manufacturing method thereof, a portion having a simple shape such as a flat portion is formed by a composite sheet in which a porous resin sheet is sandwiched between high-rigidity sheets having rigidity higher than that of the resin sheet. It is possible to reduce the weight and thickness without lowering the rigidity. In addition, since complicated parts such as bosses and ribs are formed by injection molding of a thermoplastic resin, complicated parts can also be easily formed.

[First Embodiment]
The casing and the manufacturing method thereof according to the first embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing the structure of the housing according to the present embodiment. 2 to 4 are schematic cross-sectional views illustrating the structure of the housing according to the present embodiment. 5 and 6 are process cross-sectional views illustrating the method for manufacturing the housing according to the present embodiment.

  First, the structure of the housing according to the present embodiment will be described with reference to FIGS.

  The housing 10 according to the present embodiment is not particularly limited, but is a box for housing an electronic device or the like. For example, a notebook personal computer exterior component as shown in FIG. 1 or a cellular phone exterior component. It is applicable to such as.

  A housing 10 shown in FIG. 1 includes a flat portion 12, a side wall portion 14 surrounding the flat portion 12, a boss 16 formed on the flat portion 12, a rib 18 and the like.

  For example, as shown in FIG. 2, the planar portion 12 of the housing 10 is formed by a composite sheet 20 having a sandwich structure in which a core layer 24 including a porous resin sheet (porous resin sheet) is sandwiched between skin layers 22 and 26. Is formed. Complex portions of the housing 10 such as the side wall portion 14, the boss 16, and the rib 18 are formed of the thermoplastic resin 30. The complex shape portion is a portion including a structure that is difficult to form by press molding of the composite sheet 20.

  The skin layer 26 is removed from the joint portion of the boss 16 and the rib 18 to the composite sheet 20. The side wall portion 14, the boss 16 and the rib 18, and the core layer 24 are joined via a mixed region 28 of the thermoplastic resin 30 and the material for forming the core layer 24. The mixed region 28 is a region formed by melting and mixing the thermoplastic resin 30 and the material for forming the core layer 24.

  The thermoplastic resin 30 forming the complicated shape portions such as the side wall portion 14, the boss 16, and the rib 18 is not particularly limited as long as it is a resin material that can be injection-molded. For example, ABS resin (acrylonitrile / butadiene / styrene resin), PC-ABS resin (polycarbonate-acrylonitrile / butadiene / styrene resin), PC resin (polycarbonate resin), PS resin (polystyrene resin), PA resin (polyamide resin), PC A thermoplastic resin such as ASA resin (polycarbonate-acrylonitrile / styrene / acrylate resin) can be used.

  The core layer 24 of the composite sheet 20 is a layer including a porous resin sheet, and a resin sheet having regular holes or a foamed resin sheet can be applied. The pore structure of the porous resin sheet is not particularly limited, and may be either a closed cell or an open cell. The pores of the porous resin sheet may be filled with hollow particles such as hollow glass.

  The material of the core layer 24 is not particularly limited as long as it is a material having a melting point equal to or lower than the melting point of the thermoplastic resin 30 forming the complicated shape portion such as the side wall portion 14, the boss 16, and the rib 18. For example, polymethacrylimide, polyetherimide, polypropylene, polyethylene, acrylic and the like can be applied. The material having a melting point equal to or lower than the melting point of the thermoplastic resin 30 forming the complicated shape portion is applied by melting the porous resin sheet by the heat when the thermoplastic resin 30 is injection-molded, and the core layer 24 and the thermoplastic resin. This is because the bonding strength can be increased by forming the mixed region 28 between the two.

  Considering the relationship between the melting point and the adhesiveness between the material of the core layer 24 and the thermoplastic resin 30, for example, polymethacrylimide is used as the core layer 24, and PC-ABS resin (melting point 220 ° C.) is used as the thermoplastic resin 30. It is preferable to use.

  The skin layers 22 and 26 of the composite sheet 20 have a role of supplementing the strength of the porous core layer 24, and are formed of a highly rigid sheet having higher rigidity than the core layer 24. The material of the skin layers 22 and 26 is not particularly limited as long as the material is higher in rigidity than the core layer 24. For example, a resin sheet (prepreg) impregnated in a resin material with inorganic fibers such as glass fibers (GF) and carbon fibers (CF), or organic fibers such as kenaf and hemp as a single body, as a nonwoven fabric, or as a woven fabric ) Can be applied. Alternatively, a metal sheet of a metal such as Al (aluminum), Mg (magnesium), Ti (titanium), SUS (stainless steel), Zn (zinc), or an alloy sheet of an alloy including these can be used.

  Note that the complicatedly shaped portions such as the bosses 16 and the ribs 18 formed on the planar portion 12 of the housing 10 do not necessarily have to be formed so as to be directly bonded to the core layer 24 as shown in FIG. For example, as shown in FIG. 3, the thermoplastic resin 30 forming the side wall portion 14 is formed to extend to the flat portion 12, and the boss 16 and the like are continuously formed from the flat portion 12 formed by the thermoplastic resin 30. You may make it do. Alternatively, for example, as shown in FIG. 4, the thermoplastic resin 30 is formed to extend on the skin layer 26, and the boss 16, the rib 18, etc. are continuously formed from the thermoplastic resin 30 extending on the skin layer 26. You may make it form.

  Next, the manufacturing method of the housing according to the present embodiment will be described with reference to FIGS.

  First, the porous resin sheet used as the core layer 24 and the highly rigid sheet used as the skin layers 22 and 26 are prepared.

  The porous resin sheet may be formed by punching holes in a resin sheet having no holes, or a commercially available foamed resin sheet or the like may be used. As a commercially available foamed resin sheet, for example, “ROHACELL IG51” manufactured by Sanwa Trading Co., Ltd. formed of foamed polymethacrylimide, “Sekisui Formac # 2505” manufactured by Sekisui Chemical Co., Ltd. formed of foamed acrylic. Etc.

  As the high-rigidity sheet, for example, inorganic fibers such as glass fibers (GF) and carbon fibers (CF) and organic fibers such as kenaf and hemp are used alone, in the form of a nonwoven fabric, or in the form of a woven fabric in a resin material. Impregnated resin sheets (prepreg), Al (aluminum), Mg (magnesium), Ti (titanium), SUS (stainless steel), metal sheets of metals such as Zn (zinc), alloy sheets of alloys containing these metals, etc. Can be applied. Examples of commercially available resin sheets include carbon fiber cloth manufactured by Toray Industries, Inc. Examples of the alloy material applicable to the alloy sheet include AZ91D alloy, AZ31 alloy, ZK61 alloy, AE42 alloy, and ZE41 alloy.

  Note that, for example, as shown in FIG. 2, when the casing 10 to be manufactured has a complicated shape portion such as a boss 16 or a rib 18 on the flat surface portion 12, the boss 16 or the rib 18 of a high-rigidity sheet or the like. An opening is formed in advance in the high-rigidity sheet of the part to be formed.

  Next, for example, using an adhesive such as an epoxy adhesive, high-rigidity sheets are bonded to both surfaces of the porous resin sheet and integrated by press molding or the like. Thus, the composite sheet 20 in which the core layer 24 including the porous resin sheet is sandwiched between the skin layers 22 and 26 of the high-rigidity sheet is formed (FIG. 5A). Note that hollow particles such as hollow glass may be added to the adhesive.

  Next, the composite sheet 20 formed in this way is set between the molds 40 and 42 for injection molding of a thermoplastic resin (FIG. 5B). In the following description, an example in which the side wall portion 14 of the housing 10 is formed by injection molding of a thermoplastic resin is shown. When forming other complicated shapes such as the bosses 16 and the ribs 18, the dies 40 and 42 may be appropriately changed according to the shape of the casing to be formed.

  Next, the molten thermoplastic resin 30 is injected into the molds 40 and 42 by the extruder 44, and a complicatedly shaped portion of the housing 10 is formed by the thermoplastic resin 30 (FIG. 6A). At this time, a thermoplastic resin material having a melting point higher than that of the resin of the core layer 24 is used as the thermoplastic resin 30 to be injected into the molds 40 and 42. As a result, the core layer 24 in the portion in contact with the thermoplastic resin 30 is dissolved by the heat of the injected thermoplastic resin 30, and the injected thermoplastic resin 30 and the resin of the core layer 24 are mixed to form a mixed region 28. Is done. Thereby, the joint strength between the complex shape part formed of the thermoplastic resin 30 and the composite sheet 20 can be increased.

  Next, after cooling, the casing 10 formed by integrating the injection-molded thermoplastic resin 30 and the composite sheet 20 is taken out from the molds 40 and 42.

  FIG. 6B is an enlarged cross-sectional view of the housing 10 in a region surrounded by a dotted line in FIG. In the case 10 taken out, an unnecessary portion called a gate 32 is formed at the injection port portion of the thermoplastic resin 30.

  Next, post-processing such as removal of the gate 32 is performed on the housing 10 taken out from the molds 40 and 42 to complete the housing 10 according to the present embodiment.

  Thus, according to the present embodiment, a portion having a simple shape such as a flat portion is formed by a composite sheet in which a porous resin sheet is sandwiched between high-rigidity sheets having higher rigidity than the resin sheet. It is possible to reduce the weight and thickness without lowering the rigidity. In addition, since complicated parts such as bosses and ribs are formed by injection molding of a thermoplastic resin, complicated parts can also be easily formed.

[Second Embodiment]
A housing and a manufacturing method thereof according to the second embodiment will be described with reference to FIGS. Components similar to those of the housing and the manufacturing method thereof according to the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 7 is a schematic cross-sectional view showing the structure of the housing according to the present embodiment. 8 and 9 are process cross-sectional views illustrating the manufacturing method of the housing according to the present embodiment.

  First, the structure of the housing according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 7, the housing 10 according to the present embodiment is based on the first embodiment in that a complex shape portion (side wall portion 14) formed of the thermoplastic resin 30 is joined to the composite sheet 20. The same as the case 10. The difference between the housing 10 according to the present embodiment and the housing according to the first embodiment is that the composite sheet 20 has a shape bent at the side wall portion 14 instead of a planar shape.

  In the housing 10 according to the present embodiment, the composite sheet 20 is press-molded before the injection molding of the thermoplastic resin 30. By press-molding the composite sheet 20 in advance, not only the plate shape but also a complicated round shape or uneven shape can be dealt with, and the design of the housing 10 can be improved.

  In addition, in the housing | casing 10 shown in FIG. 7, although the boss | hub 16, the rib 18, etc. are not provided, it can also provide similarly to the case of the housing | casing 10 by 1st Embodiment. Further, the thermoplastic resin 30 is formed so as to cover the outer side of the composite sheet 20 of the side wall portion 14, but it is connected only to the end portion of the composite sheet 20 as in the case of the housing 10 according to the first embodiment. As described above, the thermoplastic resin 30 may be formed. Moreover, you may form so that the surface of the composite sheet 20 of the plane part 12 may also be covered.

  Next, the manufacturing method of the housing according to the present embodiment will be described with reference to FIGS.

  First, for example, the composite sheet 20 in which the core layer 24 including the porous resin sheet is sandwiched between the skin layers 22 and 26 of the high-rigidity sheet in the same manner as in the housing manufacturing method according to the first embodiment shown in FIG. Form.

  Next, the composite sheet 20 thus formed is set between press-molding dies 46 and 48 (FIG. 8A).

  Next, the composite sheet 20 is pressed at a predetermined pressure for a predetermined time by the molds 46 and 48, and the composite sheet 20 is formed into a predetermined shape (FIG. 8B). In addition, although the figure has shown the case where the edge part of the composite sheet 20 is bent at right angle, the shaping | molding shape of the composite sheet 20 is not limited to this.

  Next, the composite sheet 20 molded in this way is set between the molds 40 and 42 for injection molding of the thermoplastic resin 30 (FIG. 9A). Here, an example in which the thermoplastic resin 30 is formed by injection molding by connecting to the composite sheet 20 of the side wall portion 14 is shown. When forming other complicated shapes such as the bosses 16 and the ribs 18, the mold 30 may be changed as appropriate according to the shape of the casing to be formed.

  Next, the molten thermoplastic resin 30 is injected into the molds 40 and 42 by the extruder 44, and a complex shape portion of the housing 10 is formed by the thermoplastic resin 30. At this time, a thermoplastic resin material having a melting point higher than that of the resin of the core layer 24 is used as the thermoplastic resin 30 to be injected into the molds 40 and 42. As a result, the core layer 24 in the portion in contact with the thermoplastic resin 30 is dissolved by the heat of the injected thermoplastic resin 30, and the injected thermoplastic resin 30 and the resin of the core layer 24 are mixed to form a mixed region 28. Is done. Thereby, the joint strength between the complex shape part formed of the thermoplastic resin 30 and the composite sheet 20 can be increased.

  Next, after cooling, the casing 10 formed by integrating the injection-molded thermoplastic resin 30 and the composite sheet 20 is taken out from the molds 40 and 42, and post-processing such as removal of the gate 34 is performed. The housing 10 is completed. FIG. 9B is an enlarged cross-sectional view of the housing 10 in a region surrounded by a dotted line in FIG.

  Thus, according to the present embodiment, a portion having a simple shape such as a flat portion is formed by a composite sheet in which a porous resin sheet is sandwiched between high-rigidity sheets having higher rigidity than the resin sheet. It is possible to reduce the weight and thickness without lowering the rigidity. In addition, since complicated parts such as bosses and ribs are formed by injection molding of a thermoplastic resin, complicated parts can also be easily formed. In addition, since the composite sheet is press-molded in advance, not only the plate shape but also a complicated round shape or uneven shape can be dealt with, and the design of the housing can be improved.

[Example 1]
A carbon fiber cloth (manufactured by Toray Industries, Inc.) having a film thickness of 0.2 mm was prepared as a high-rigidity sheet for the skin layer. In addition, as a porous resin sheet for the core layer, foamed methacrylimide having a thickness of 2 mm (“Rohacel IG51” manufactured by Sanwa Trading Co., Ltd.) was prepared.

  Next, a high-rigidity sheet of carbon fiber cloth was bonded to both surfaces of the foamed methacrylimide porous resin sheet using an epoxy adhesive and integrated by press molding. Thus, a composite sheet in which the core layer of foamed methacrylimide was sandwiched between the skin layers of the carbon fiber cloth was formed.

  Subsequently, the composite sheet thus formed was set in an injection mold, and PC (polycarbonate) resin (“Taflon GZK3200” manufactured by Idemitsu Kosan Co., Ltd.) was injected. The molding conditions were a mold temperature of 80 ° C., a cylinder temperature of 270 ° C., and a cooling time of 30 seconds.

  In this way, a casing in which the composite sheet in which the core layer of foamed methacrylimide was sandwiched by the skin layer of the carbon fiber cloth and the injection molded PC resin was integrated was formed.

  The housing manufactured in this way is shown in FIG.

  The manufactured casing had a specific gravity of 1.1, and was able to achieve a very small value as compared with high-rigidity plastic (specific gravity: 1.5) and Mg alloy (specific gravity: 1.84). Further, when a load resistance test was performed, it was found that the cylinder had a rigidity that did not break even under a φ10 mm cylinder and a 35 kgf load. This strength was comparable to that of a highly rigid plastic or Mg alloy casing, and a lightweight and high-strength casing could be realized.

[Example 2]
An Mg alloy (AZ31B) having a film thickness of 0.3 mm was prepared as a high-rigidity sheet for the skin layer. Also, a foamed acrylic film having a thickness of 2 mm (“Sekisui Formac # 2505” manufactured by Sekisui Chemical Co., Ltd.) was prepared as a porous resin sheet for the core layer.

  Next, a highly rigid sheet of Mg alloy was bonded to both surfaces of the foamed acrylic porous resin sheet using an epoxy adhesive and integrated by press molding. Thus, a composite sheet in which the foamed acrylic core layer was sandwiched between the Mg alloy skin layers was formed.

  Next, the composite sheet thus formed was set in an injection mold, and PC-ABS (polycarbonate-acrylonitrile-butadiene-styrene) resin (“Multilon TN-7110F” manufactured by Teijin Chemicals Ltd.) was injected. . Molding conditions were a mold temperature of 70 ° C., a cylinder temperature of 260 ° C., and a cooling time of 30 seconds.

  In this way, a casing in which the composite sheet in which the foamed acrylic core layer was sandwiched between the Mg alloy skin layers and the injection molded PC-ABS resin was integrated was formed.

  The housing manufactured in this way is shown in FIG.

  The manufactured casing had a specific gravity of 1.2, and was able to achieve a very small value as compared with high-rigidity plastic (specific gravity: 1.5) and Mg alloy (specific gravity: 1.84). Further, when a load resistance test was performed, it was found that the cylinder had a rigidity that did not break even under a φ10 mm cylinder and a 35 kgf load. This strength was comparable to that of a highly rigid plastic or Mg alloy casing, and a lightweight and high-strength casing could be realized.

[Modified Embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in the above embodiment, the core layer 24 of the composite sheet 20 is formed of a material having a melting point lower than the melting point of the thermoplastic resin 30 to be injection-molded. However, the thermoplastic resin 30 that is also injection-molded of the skin layers 22 and 26. You may form with the material whose melting | fusing point is lower than melting | fusing point. Thereby, the skin layers 22 and 26 are melted by the heat of the thermoplastic resin 30 to be injection-molded, and the bonding strength between the skin layers 22 and 26 and the thermoplastic resin 30 can be increased.

  Moreover, in the said 2nd Embodiment, although the composite sheet 20 was press-molded before the injection molding of the thermoplastic resin, the composite sheet 20 is press-molded after the thermoplastic resin 30 is injection-molded to form a complicated shape portion. You may do it.

  Moreover, although the housing | casing and its manufacturing method were mainly demonstrated in the said embodiment, the housing | casing of the said embodiment can be widely applied as a housing | casing for various electronic devices. Application to a small electronic device that is particularly required to have a lighter and thinner casing is extremely effective.

  In addition, the constituent materials and manufacturing conditions disclosed in the above embodiments are merely representative examples, and are not limited to the disclosure, and can be appropriately changed depending on the purpose and the like.

FIG. 1 is a perspective view showing a structure of a housing according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing the structure of the housing according to the first embodiment. FIG. 3 is a schematic cross-sectional view (No. 1) showing another structure of the housing according to the first embodiment. FIG. 4 is a schematic sectional view (No. 2) showing another structure of the housing according to the first embodiment. FIG. 5 is a process cross-sectional view (part 1) illustrating the manufacturing method of the housing according to the first embodiment. FIG. 6 is a process cross-sectional view (part 2) illustrating the manufacturing method of the housing according to the first embodiment. FIG. 7 is a schematic cross-sectional view showing the structure of the housing according to the second embodiment. FIG. 8 is a process cross-sectional view (part 1) illustrating the manufacturing method of the housing according to the second embodiment. FIG. 9 is a process cross-sectional view (part 2) illustrating the manufacturing method of the housing according to the second embodiment. It is a figure which shows the housing | casing by Example 1. FIG. It is a figure which shows the housing | casing by Example 2. FIG.

DESCRIPTION OF SYMBOLS 10 ... Housing | casing 12 ... Planar part 14 ... Side wall part 16 ... Boss 18 ... Rib 20 ... Composite sheet 22, 26 ... Skin layer 24 ... Core layer 28 ... Mixed region 30 ... Thermoplastic resin 32 ... Gate 40, 42, 46, 48 ... Mold 44 ... Extruder

Claims (7)

A composite sheet portion formed by a composite sheet in which a porous resin sheet is sandwiched between rigid sheets having higher rigidity than the resin sheet;
A housing having a thermoplastic resin portion bonded to at least the resin sheet of the composite sheet portion and formed of a thermoplastic resin. The housing of claim 1,
The melting point of the thermoplastic resin is higher than the melting point of the resin material forming the resin sheet. The housing according to claim 1 or 2,
A mixed region in which the thermoplastic resin and the resin material of the resin sheet are mixed is formed at a joint portion between the resin sheet and the thermoplastic resin portion of the composite sheet portion.   A thermoplastic resin part formed of the thermoplastic resin bonded to the resin sheet by injection molding of a thermoplastic resin in a composite sheet in which a porous resin sheet is sandwiched between rigid sheets higher in rigidity than the resin sheet The manufacturing method of the housing | casing characterized by having the process of forming. In the manufacturing method of the housing according to claim 4,
The method of manufacturing a casing further comprising a step of forming the composite sheet into a predetermined shape. In the manufacturing method of the housing | casing of Claim 4 or 5,
In the step of forming the thermoplastic resin portion, the thermoplastic resin and the resin sheet are joined by dissolving the resin sheet in a portion in contact with the thermoplastic resin by heat of the thermoplastic resin. A manufacturing method of a housing characterized. The housing according to any one of claims 1 to 3,
An electronic device comprising: an electronic device housed in the housing.