Electronic equipment and display devices

Abstract

It ensures both fire protection and EMC functions while avoiding an increase in the overall weight of the enclosure. [Solution] According to the present invention, there is provided an electronic device comprising a circuit board and a fireproof enclosure, the fireproof enclosure including a first member made of sheet metal and a second member including an insulating layer and a metal layer, the first member having a top surface portion with one or more openings and covering a portion of the circuit board, the second member blocking the one or more openings, and the insulating layer of the second member being located between the metal layer and the circuit board.

Description

[Technical field]

[0001] The present invention relates to an electronic device having a fire-resistant enclosure. The present invention also relates to a display device comprising such an electronic device. [Background technology]

[0002] Various devices including liquid crystal display devices have a circuit board mounted with elements connected to a power source (commercial power source or battery) inside a housing. In such electronic devices, it is common to attach a metal enclosure to the circuit board to cover the elements that can become hot (for example, see Patent Document 1 below).

[0003] The enclosure may also be required to have a function of ensuring EMC (Electromagnetic Compatibility).From the viewpoint of ease and cost of manufacture, the enclosure is generally formed from sheet metal (for example, see Patent Document 2 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] US Patent Application Publication No. 2023 / 171932 [Patent Document 2] JP 2000-148031 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, as disclosed in Patent Document 2, for example, if the enclosure is shaped to cover the entire circuit board, not only will the size of the enclosure increase, but the thickness will also increase from the viewpoint of ensuring rigidity, and the overall weight of the electronic device will increase. In other words, the demand for thinner and lighter electronic devices may not be met. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] An electronic device comprising: a circuit board; and a fireproof enclosure, the fireproof enclosure including a first member made of sheet metal and a second member including an insulating layer and a metal layer, the first member having a top surface portion with one or more openings therein and covering a portion of the circuit board, the second member blocking the one or more openings, the insulating layer of the second member being located between the metal layer and the circuit board. [2] The electronic device according to [1], wherein the second member is positioned between the top surface portion of the first member and the circuit board. [3] The electronic device according to [1] or [2], wherein the one or more openings include an opening having a shape in which the length of its widest part exceeds 1.0 mm. [4] An electronic device as described in any one of [1] to [3], wherein the first member has a pair of wall portions that rise from the top surface portion and face each other, the wall portions have a support portion that extends toward the inside of the first member, and the circuit board is held between the pair of wall portions by being fixed to the support portion of the first member. [5] The electronic device according to any one of [1] to [4], wherein the metal layer is an aluminum foil attached to the insulating layer. [6] The electronic device according to any one of [1] to [5], wherein the insulating layer is a polycarbonate sheet. [7] The electronic device according to any one of [1] to [6], wherein the insulating layer has a thickness of 0.25 mm or more and 0.50 mm or less. [8] An electronic device as described in any one of [1] to [7], wherein a portion of an outer edge of the circuit board is located outside the outer edge of the top surface of the first component. [9] An electronic device as described in any one of [1] to [8], wherein the opening has a diameter greater than 1.1 mm or an area greater than 1.1 mm2.

[10] An electronic device as described in [9], wherein the opening has a diameter greater than 2.0 mm or an area greater than 3.2 mm2.

[11] A display device comprising a display panel and a housing, further comprising: an electronic device according to any one of claims [1] to

[10] ; and a third member made of sheet metal, wherein the display panel is fixed to the housing by being covered by the third member from a rear side opposite to a display surface, and the circuit board is supported in the housing at a distance from the third member by the first member.

[12] The display device according to

[11] , further comprising an arm connected to the first member.

[0007] According to the present invention, a first member made of sheet metal has one or more openings, and a second member including an insulating layer and a metal layer closes the openings. Furthermore, by positioning the insulating layer of the second member between the metal layer and the circuit board, it is possible to ensure both fire protection and EMC functions while avoiding an increase in the weight of the entire enclosure. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front perspective view of an exemplary display device according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing a rear view of an exemplary display device according to one embodiment of the present invention. [Diagram 3] 2 is a diagram illustrating the separation of an arm 500 from a housing 300 of the display device 100 shown in FIG. [Figure 4] 2 is a schematic rear perspective view showing the display device 100 with an arm 500 and a rear panel 320 removed. FIG. [Diagram 5] FIG. 1 is a schematic exploded perspective view of a display device 100. [Figure 6] 2 is an exploded perspective view showing an enlarged schematic view of the electrical equipment 200. FIG. [Figure 7] 13 is a side view for explaining an exemplary shape of a first member 221. FIG. [Figure 8]2 is a side view showing a first member 221 to which a circuit board 210 is attached. [Figure 9] 2 is a schematic perspective view showing an example of the appearance of a fire enclosure 220. FIG. [Figure 10] 2 is a schematic cross-sectional view of a second member 222 of the fire enclosure 220. FIG. [Figure 11] FIG. 11 is a schematic cross-sectional view showing another example of the arrangement of the second member 222 in the fire enclosure. [Figure 12] 13 is a plan view showing an exemplary external appearance of a main body portion 222S of a second member 222. FIG. [Figure 13] 13 is a diagram for explaining an example of an opening having a shape including a plurality of curved lines that can be provided in an outer wall 221Q of a first member 221. FIG. [Figure 14] 2 is a schematic perspective view showing a circuit board 210 and an outer shell 221Q of a first member 221 taken out from the fireproof enclosure. FIG. [Figure 15] 11 is a schematic perspective view showing an outer shell 221Q of a first member 221 taken out from the fire enclosure. FIG. [Figure 16] 13 is a schematic perspective view for explaining connection of an arm 500 to a first member 221. FIG. [Figure 17] 2 is a schematic exploded view showing an example of the configuration of an arm 500. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described. The various features shown in the following embodiment can be combined with each other. Furthermore, each feature can be an invention independently. Any number of "0"s (for example, one or two) may be added to the end of the numerical values ​​disclosed in the following description. For example, one or two "0"s may be added after "1.4" to make it "1.40" or "1.400".

[0010] <1. Overview of the display device configuration> Here, a typical embodiment of the present invention will be described by taking a liquid crystal display device as an example. FIG. 1 and FIG. 2 respectively show an example of the appearance from the front and back of a display device according to an embodiment of the present invention. The display device 100 shown in FIG. 1 and FIG. 2 includes a housing 300, a display panel 400, and an arm 500. For convenience of explanation, arrows indicating the X-axis, Y-axis, and Z-axis that are perpendicular to each other are shown in FIG. 1 and FIG. 2. As shown in FIG. 1, the arrow indicating the Z-axis here points from the front to the back of the display device 100. Hereinafter, the arrows indicating these X-axis, Y-axis, and Z-axis may also be illustrated in other drawings.

[0011] 1 and 2, the housing 300 includes a front panel 310 and a rear panel 320. As shown in Fig. 1, the front panel 310 includes a bezel 312 having an opening 30 through which a display surface 400a of a display panel 400 is exposed.

[0012] On the other hand, referring to Fig. 2, in this example, an arm 500 for supporting the display device 100 is attached to the back surface of the display device 100. Fig. 3 shows a state in which the arm 500 is separated from the housing 300 of the display device 100. The arm 500 is detachable from members arranged inside the display device 100. The structure and connection details of the arm 500 will be described later.

[0013] Fig. 4 shows the display device 100 with the arm 500 and the rear panel 320 removed. As shown in Fig. 4, the display device 100 has an internal frame 330 inside the housing 300. The internal frame 330 is made of, for example, sheet metal, and fixes the display panel 400 to the front panel 310 of the housing 300 by covering the display panel 400 from the rear side opposite the display surface 400a.

[0014] As shown in Fig. 4, the display device 100 has an electrical component 200 as an electronic device on an internal frame 330. The electrical component 200 includes a circuit board 210 on which a driver for a display panel 400 and the like are mounted, and functions as a control unit for the display device 100. As shown in an enlarged view in Fig. 4, the electrical component 200 includes the above-mentioned circuit board 210 and a fireproof enclosure 220 that covers at least a portion of the circuit board 210.

[0015] As will be described later in detail with reference to the drawings, the fireproof enclosure 220 includes at least a first member 221 and a second member 222. The electrical equipment 200 may be configured to be detachably attached to, for example, an internal frame 330 on the rear side of the display panel 400 as an integrated unit by fixing the circuit board 210 to, for example, the first member 221 of the fireproof enclosure 220. As will be described later, the circuit board 210 of the electrical equipment 200 may be supported by the first member 221 and disposed in the housing 300 at a distance from the internal frame 330.

[0016] Fig. 5 is a schematic diagram showing the inside of the display device 100 by disassembling the display device 100. However, in order to avoid overly complicating the drawings, some members are omitted in Fig. 5. In other drawings of the present disclosure, some members such as screws may also be omitted.

[0017] As shown in FIG. 5, the display device 100 includes a front panel 310, a display panel 400, an internal frame 330, an electrical component 200, and a rear panel 320. The display panel 400 includes, for example, a liquid crystal panel and a backlight unit. That is, the display device 100 described here is a liquid crystal display device. Here, the display panel 400 has a horizontally long rectangular shape, and the X-axis and the Y-axis are parallel to the long and short sides of the rectangular shape of the display panel 400, respectively. Of course, the display device of the present invention is not limited to a liquid crystal display device, and may be a self-luminous display device such as a mini LED display or an organic EL display.

[0018] As described above, the electrical equipment 200 includes the circuit board 210 and the fireproof enclosure 220. Here, the fireproof enclosure 220 is configured by integrating the second member 222 and the first member 221 arranged from the front to the back of the display device 100, and covers the circuit board 210 from the back side of the display device 100.

[0019] 5, the display device 100 further includes an insulating sheet 201 located between the circuit board 210 and the internal frame 330 (or the display panel 400). However, the arrangement of such an insulating sheet 201 is not essential to the embodiment of the present invention and may be omitted.

[0020] <2. Electrical Equipment 200> 6 shows an exploded view of the electrical equipment 200 shown in FIG. 5. The circuit board 210 of the electrical equipment 200 is typically a printed circuit board (PCB) on which electronic components are mounted. As shown typically in FIG. 6, electronic components such as a USB connector 12 are mounted on an upper surface 210a of the circuit board 210. For simplicity, electronic components other than the USB connector 12 are not shown in FIG. 6. In the embodiment of the present invention, the upper surface 210a of the main surfaces of the circuit board 210 faces the side opposite to the display panel 400, i.e., the fire enclosure 220.

[0021] The shape of circuit board 210 in plan view in a direction parallel to the Z axis of the figure is, for example, rectangular. In the example shown in Fig. 6, circuit board 210 has a rectangular shape that is longer in the X-axis direction than in the Y-axis direction. Of course, the shape of circuit board 210 in plan view is not limited to this example, and may be other shapes such as a square shape or a circle shape.

[0022] The fireproof enclosure 220 of the electrical equipment 200 generally covers the entire circuit board 210. However, as will be understood from a comparison of Fig. 4 and Fig. 6, the fireproof enclosure 220 may have small-diameter holes for passing through connectors (e.g., the USB connector 12 in Fig. 6) on the circuit board 210. As long as both the fireproof and EMC functions can be ensured, the formation of such holes in the fireproof enclosure 220 is permissible.

[0023] In the embodiment of the present invention, the fire enclosure 220 is composed of a plurality of members. Here, the fire enclosure 220 is generally composed of at least two members, a first member 221 and a second member 222. Of these, the first member 221 is composed of sheet metal, and the second member 222 includes a main body portion 222S that is composed of a combination of a plurality of members made of different materials, as described below. In this example, the second member 222 further includes, in addition to the main body portion 222S, two covering members 222T each having a strip shape.

[0024] In the configuration illustrated in FIG. 6, the first member 221 of the fire enclosure 220 includes two parts, an intermediate plate 221P and an outer shell 221Q, each of which is made of sheet metal. Of these, the outer shell 221Q has a top surface 20 provided with one or more openings. The top surface 20 is a plate-like part corresponding to one of the faces having the largest area among the multiple faces constituting the shape of the outer shell 221Q, and here, three openings, a first opening 20x, a second opening 20y, and a third opening 20z, are provided on the top surface 20. It is not essential that the top surface 20 is flat, and it may have a curved surface or a part with a different thickness. However, from the viewpoint of making the display device 100 thinner, it is more advantageous if the top surface 20 is flat and plate-like.

[0025] In the illustrated example, the second opening 20y is located between the first opening 20x and the third opening 20z and has an area larger than each of the first opening 20x and the third opening 20z. In an exemplary embodiment of the present invention, at least one of the first opening 20x, the second opening 20y, and the third opening 20z may have a size capable of exposing two or more electronic components mounted on the circuit board 210.

[0026] The intermediate plate 221P of the first member 221 has a generally plate-like shape overall, and is joined to the top surface 20 of the outer shell 221Q by riveting or the like. In this example, the intermediate plate 221P is attached to the surface of the top surface 20 opposite to the surface facing the rear panel 320 (see FIG. 5, for example).

[0027] The intermediate plate 221P is located approximately in the center of the top surface portion 20 in the X direction of the figure, and when fixed to the outer shell 221Q, it closes the second opening 20y of the above-mentioned three openings. Here, in this specification, when two members are combined, when one member "closes" the opening of the other member, it means that one member overlaps the entire opening when viewed in the Z direction of the figure. However, it is not essential that one member completely covers the entire opening as long as the specifications or standards related to fire protection and EMC required for the product are satisfied. For example, the member that closes the opening may have a small diameter hole or the like within a range that satisfies the required specifications or standards.

[0028] The second opening 20y is closed by the intermediate plate 221P of the first member 221, while the first opening 20x and the third opening 20z, as described below, are closed by the second member 222. In this sense, it can be said that the fire enclosure 220 covers almost the entire circuit board 210 as a whole.

[0029] FIG. 7 shows an exemplary shape of the first member 221 when viewed from the side. In the configuration illustrated in FIG. 7, the outer shell 221Q of the first member 221 has, in addition to the top surface portion 20, the walls 21 and 22, the legs 23 and 24, and the bent portions 1 to 4. The walls 21 and 22 rise substantially vertically from the top surface portion 20 and face each other in the Y direction in the figure. The bent portion 1 is located between the top surface portion 20 and the wall 21, and the bent portion 2 is located between the top surface portion 20 and the wall 22. The leg portion 23 is formed by bending a part of the sheet metal constituting the outer shell 221Q from the wall portion 21 to the outside at a substantially right angle, and the leg portion 24 is formed by bending another part of the sheet metal from the wall portion 22 to the outside at a substantially right angle. Bent portion 3 is located between wall portion 21 and leg portion 23 , and bent portion 4 is located between wall portion 22 and leg portion 24 .

[0030] FIG. 8 shows the first member 221 to which the circuit board 210 is attached. The outer shell 221Q of the first member 221 has a top surface 20, walls 21, 22, and legs 23, 24, and thus has a generally U-shaped cross section with the top surface 20 as the bottom surface. As will be described in detail later, the circuit board 210 is fixed to the first member 221 (particularly the outer shell 221Q of the first member 221 here) between the walls 21 and 22 with the upper surface 210a facing the top surface 20 of the outer shell 221Q. At this time, as shown in FIG. 8, the upper surface 210a of the circuit board 210 does not contact the top surface 20 and the intermediate plate 221P of the outer shell 221Q, and a space Gp is ​​formed between the circuit board 210 and the intermediate plate 221P. In this embodiment, the second member 222 of the fire enclosure 220 is inserted into this space Gp, and thus a large portion of the second member 222 is disposed between the circuit board 210 and the top surface portion 20.

[0031] 9 shows an example of the appearance of the fireproof enclosure 220. The second member 222 of the fireproof enclosure 220 covers almost the entire circuit board 210 attached to the first member 221, and a part of the main body 222S of the second member 222 is exposed to the outside from the first opening 20x and the third opening 20z provided in the top surface 20 of the first member 221. In other words, in the exemplary configuration shown in FIG. 9, the second member 222 also blocks the first opening 20x and the third opening 20z provided in the top surface 20.

[0032] As can be seen from Fig. 6 above, here, covering members 222T are attached to both ends in the longitudinal direction (here, parallel to the X-axis) of main body portion 222S of second member 222. An example of covering member 222T is aluminum tape. In the embodiment of the present invention, it is not essential that main body portion 222S of second member 222 covers entire circuit board 210. It is sufficient that second member 222 covers circuit board 210 as a whole.

[0033] FIG. 10 shows a schematic example of a cross section of the second member 222 of the fire enclosure 220. The second member 222 includes two or more layers made of different materials, and includes an insulating layer 22L and a metal layer 22M in this example. A resin sheet may be used as the insulating layer 22L. Examples of materials for the resin sheet include thermoplastic resins such as polycarbonate, polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and polyoxymethylene (POM). Examples of materials for the metal layer 22M include aluminum, copper, tin, and stainless steel. The use of aluminum, for example, for the metal layer 22M is advantageous in terms of reducing manufacturing costs and weight.

[0034] In this embodiment, aluminum foil is exemplified as the metal layer 22M. The above-mentioned covering member 222T (here, aluminum tape, see FIG. 6) can exert a function of ensuring electrical connection between the metal layer 22M of the main body portion 222S and the first member 221, particularly the outer shell 221Q.

[0035] In the embodiment of the present invention, it is not essential that both the insulating layer 22L and the metal layer 22M have a self-supporting structure. For example, the metal layer 22M may be a layer formed on the insulating layer 22L by deposition, sputtering, or the like. In this case, the insulating layer 22L may function as a support layer for the metal layer 22M. As will be described later, it is also not essential in the embodiment of the present invention that the metal layer 22M covers the entire surface of the insulating layer 22L.

[0036] 10, the second member 222 further includes an adhesive layer 22N located between the insulating layer 22L and the metal layer 22M. That is, in the configuration illustrated in FIG 10, the second member 222 is a composite material having a laminated structure including three layers.

[0037] The insulating layer 22L and the metal layer 22M may be independent members, or may be joined to each other by another member such as an adhesive layer 22N as shown in FIG. 10. In the embodiment of the present invention, the insulating layer 22L and the metal layer 22M need only be in contact with each other in a manner that allows heat transfer, and it is not essential that they are in direct contact with each other. The thermal conductivity of the adhesive layer 22N is, for example, in the range of 0.50 to 2.1 W / mK, and is advantageously 1.5 W / mK or more. For the adhesive layer 22N, a general adhesive such as an acrylic adhesive, a rubber adhesive, a silicon adhesive, or a urethane adhesive may be used.

[0038] 10, here, the insulating layer 22L of the second member 222 is located between the metal layer 22M and the circuit board 210. By interposing the insulating layer 22L between the metal layer 22M of the second member 222 and the circuit board 210, it is possible to prevent an electrical short circuit between the electronic components on the circuit board 210 and the metal layer 22M, and further between the electronic components on the circuit board 210 and the first member 221.

[0039] Here, the second member 222 is located between the top surface 20 or the intermediate plate 221P of the outer shell 221Q of the first member 221 and the circuit board 210. However, the fire protection function and EMC function of the fire enclosure 220 do not basically depend on the mutual arrangement relationship of the first member 221 and the second member 222 in the fire enclosure 220. As in the fire enclosure 220A illustrated in FIG. 11, an arrangement in which, for example, the top surface 20 of the first member 221 is located between the second member 222 and the circuit board 210 is also possible. However, in order to achieve such an arrangement, it is necessary to increase the distance between the first member 221 and the circuit board 210 (i.e., the space Gp) in order to ensure insulation between them. From the viewpoint of making the electrical equipment 200 thinner, it can be said that an arrangement in which the second member 222 is interposed between the top surface 20 of the first member 221 and the circuit board 210 as illustrated in FIG. 10 is more advantageous.

[0040] <3. Findings of the inventors and effects of the present invention> In the above-described embodiment, the first member 221 of the fire enclosure 220, 220A has a plurality of openings (here, the first opening 20x and the third opening 20z). These openings function as lightening holes in the outer shell 221Q of the first member 221, and contribute to reducing the weight of the first member 221.

[0041] A fireproof enclosure is required to have a function of preventing the spread of fire even if electronic components on a circuit board ignite, and international standards such as IEC62368 have been established for this purpose. According to the inventor's study, it is difficult to satisfy the standards for fireproofing (e.g., IEC 60950-1:2005+AMD1:2009+AMD2:2013) by simply disposing a resin sheet alone between a sheet metal member and a printed circuit board, but the standards for fireproofing can be satisfied by applying the second member 222 including the insulating layer 22L and the metal layer 22M. This is presumably because the metal layer 22M disposed close to the insulating layer 22L exerts a function of releasing heat to the insulating layer 22L to the outside.

[0042] Thus, according to the above-mentioned embodiment, the fireproof function of the entire fireproof enclosure can be ensured while achieving weight reduction by providing the first member 221 with the lightening holes. Furthermore, in the above-mentioned embodiment, in the electrical equipment 200, the second member 222 of the fireproof enclosure 220 has an arrangement that closes the first opening 20x and the third opening 20z provided in the first member 221. Here, since the second member 222 includes the metal layer 22M, the metal layer 22M exhibits the function of shielding electromagnetic waves, and the EMC function of the entire enclosure can be ensured while achieving weight reduction.

[0043] <4. Other details of the components that make up the fire enclosure> As described above, the technology disclosed in this specification contributes to weight reduction of electronic devices while ensuring both fire protection and EMC functions. Other details of the members constituting the fire enclosures 220 and 220A will be described below.

[0044] (4.1 Second member 222) In the fire enclosure, the second member 222 does not basically require rigidity like the first member 221 or the circuit board 210. The metal layer 22M and the insulating layer 22L of the second member 222 may both be sheet-like members. In this specification, the term "sheet-like" is interpreted to broadly include flexible forms such as films, foils, and thin plates, regardless of whether they are self-supporting structures.

[0045] In the example described with reference to Figures 10 and 11, aluminum foil is attached to the insulating layer 22L via the adhesive layer 22N as the metal layer 22M. The use of aluminum foil is easier than forming a metal film on the insulating layer 22L by, for example, vapor deposition, and is advantageous in terms of reducing manufacturing costs. An aluminum tape with an adhesive applied to one surface in advance may be used as a combination of the metal layer 22M and the adhesive layer 22N.

[0046] FIG. 12 shows an example of the appearance of the main body 222S of the second member 222. In the example shown in FIG. 12, the metal layer 22M of the main body 222S does not cover the central area of ​​the surface of the insulating layer 22L, and a part of the insulating layer 22L is exposed to the outside as shown in the diagram by hatching. As in this example, the entire main body 222S may not have a laminated structure of the metal layer 22M and the insulating layer 22L. In this embodiment, at least a part of the main surface of the insulating layer 22L corresponding to the base 510 of the arm 500 shown in FIG. 17 described later is not covered by the metal layer 22M. A structure such as a slit may be formed in the part of the insulating layer 22L that is not covered by the metal layer 22M.

[0047] The portion of the insulating layer 22L that is not covered by the metal layer 22M may overlap, for example, with the area of ​​the second opening 20y projected onto the XY plane in the figure. However, here, as described with reference to Fig. 6, the second opening 20y is closed by the intermediate plate 221P made of sheet metal. Even if the entire surface of the insulating layer 22L is not covered with the metal layer 22M, the EMC specification requirements can be satisfied by closing the opening of the outer shell 221Q with a metal member such as the intermediate plate 221P.

[0048] In the above embodiment, a polycarbonate sheet is exemplified as the insulating layer 22L. According to the inventor's study, by using polycarbonate as the material of the insulating layer 22L, the weight of the insulating layer 22L can be set to, for example, 25 g or less while satisfying the requirement of fireproofing. By selecting the material of the insulating layer 22L, it is possible to satisfy the environmental standard (typically, gold registration of the US environmental evaluation system "EPEAT (Electronic Product Environmental Assessment Tool)") while securing the function of fireproofing. Thermoplastic resin can be reused as recycled plastic by crushing and melting, and using thermoplastic resin as the material of the insulating layer 22L is advantageous in reducing the environmental load.

[0049] The thickness of the insulating layer 22L is, for example, in the range of 0.25 mm to 0.50 mm, and preferably in the range of 0.39 mm to 0.47 mm. To ensure a flame retardant function, the insulating layer 22L is required to have a certain thickness. On the other hand, an increase in the thickness of the insulating layer 22L leads to an increase in the weight of the electrical equipment 200. By keeping the thickness of the insulating layer 22L within the above range, it is possible to achieve both the flame retardant function and weight reduction.

[0050] (4.2 First member 221) 6, the first member 221 has one or more openings. The number and arrangement of these openings, as well as the shape and size of each opening, are essentially arbitrary as long as the functionality and rigidity required for the first member 221 are ensured.

[0051] According to the embodiment of the present invention, it is possible to provide an opening of a size that is not normally possible in a general enclosure made entirely of sheet metal while still satisfying the specification requirements for fireproofing and EMC. For example, at least one of the first opening 20x, the second opening 20y, and the third opening 20z described above may have a size larger than the opening specified as a bottom opening in IEC C62368-1:2018. For example, the opening provided in the first member 221 may have a diameter of more than 1.1 mm or a size smaller than 1.1 mm. 2 and may have a diameter of greater than 2.0 mm or an area of ​​greater than 3.2 mm. 2 According to an embodiment of the present invention, one or more openings provided in first member 221 are closed by second member 222 or intermediate plate 221P, which can improve design freedom regarding the size and / or location of these openings while still satisfying fireproofing standards.

[0052] The opening provided in, for example, the outer shell 221Q of the first member 221 may include an opening having a shape in which the length of the widest part exceeds 1.0 mm. Fig. 13 shows an example of an opening having a shape including multiple curves. The "length of the widest part" of the opening Ap shown in Fig. 13 refers to the maximum distance between a certain point P and another certain point Q on a figure that defines the shape of the opening, as shown typically by a solid double-headed arrow in Fig. 13. The length of the widest part of the opening provided in the first member 221 is typically 42 mm or less.

[0053] This "length of the widest part" can be considered as one of the parameters characterizing the size of the opening provided in the first member 221. The range of allowable sizes of the opening may be defined in relation to the thickness of the first member 221. For example, when the size of the opening is D and the thickness of the outer shell 221Q of the first member 221 in the vicinity of the portion where the opening is provided (for example, within a range of 5 mm from the outer edge of the opening) is T, the ratio (D / T) between them can be in the range of 1.45 to 14.0. The ratio (D / T) is more preferably in the range of 5.0 to 12.0.

[0054] FIG. 14 shows the circuit board 210 and the outer shell 221Q of the first member 221 taken out from the fireproof enclosure. As shown in FIG. 14, here, the top surface portion 20 of the outer shell 221Q has a shape that covers not all but a part of the circuit board 210 in a plan view seen in the Z-axis direction of the figure. In this example, a part of the outer edge of the circuit board 210 is located outside the outer edge of the top surface portion 20 in a direction parallel to the X-axis. In other words, in this example, the end portion of the rectangular short side of the circuit board 210 is exposed from the top surface portion 20. In this way, the first member 221 may have a shape in which a pair of walls (here, the wall portion 21 and the wall portion 22) face each other in one of the X-axis direction and the Y-axis direction, while both ends are open in the other direction.

[0055] As described above, the outer shell 221Q of the first member 221 has the leg portion 23 connected to the wall portion 21 and the leg portion 24 connected to the wall portion 22. The leg portion 23 is continuous to the wall portion 21 via a bent portion 3, and the leg portion 24 is continuous to the wall portion 22 via a bent portion 4. In this example, the leg portion 23 and the leg portion 24 are provided with through holes 34 for attachment to the internal frame 330 serving as the third member. That is, in this example, the electrical equipment 200 is fixed to the internal frame 330 by joining the first member 221 to the internal frame 330 by, for example, screwing (see FIG. 4).

[0056] FIG. 15 shows the outer shell 221Q of the first member 221 taken out from the fire enclosure. In the configuration illustrated in FIG. 15, the outer shell 221Q has a plurality of openings smaller than the first opening 20x, the second opening 20y, and the third opening 20z. In the example illustrated in FIG. 15, the outer shell 221Q further has four openings located in the wall portion 21 or the wall portion 22. More specifically, the outer shell 221Q has two openings 21h each extending from the wall portion 21 to the top surface portion 20, and two openings 22h each extending from the wall portion 22 to the top surface portion 20.

[0057] These openings 21h and 22h can be formed by lancing, for example. In this example, a cut that is not a closed curve is formed in the metal sheet and a part of the metal sheet is bent, so that a tab 21t is formed in the outer shell 221Q corresponding to the opening 21h, and a tab 22t is formed in the outer shell 221Q corresponding to the opening 22h. As shown in FIG. 15, each of these four tabs 21t, 22t extends toward the inside of the U-shape of the outer shell 221Q. That is, the tab 21t extends toward the wall 22 from the position of the wall 21 as a starting point, while the tab 22t extends toward the wall 21 from the position of the wall 22 as a starting point. The tabs 21t and 22t may be called claws 21t and 22t, respectively.

[0058] In this example, each of the tabs 21t and 22t is provided with a screw hole for fixing the circuit board 210. That is, here, the tabs 21t and 22t function as a support for holding the circuit board 210. The circuit board 210 is fixed between the wall portion 21 and the wall portion 22 by, for example, screwing into the tabs 21t and 22t.

[0059] 15 and 8, in this example, the tabs 21t, 22t are located closer to the top surface 20 than the lower surfaces (surfaces facing the internal frame 330) of the legs 23 and 24, and therefore the circuit board 210 is held between the walls 21 and 22, spatially separated from the upper surface of the member (here, the internal frame 330) to which the first member 221 is fixed. By supporting the circuit board 210 on the first member 221, direct contact between the circuit board 210 and members other than the first member 221 (for example, the internal frame 330) can be avoided, and damage to the circuit board 210, an electrical short circuit between the circuit board 210 and members other than the first member 221, and the like can be prevented.

[0060] The structure for supporting the circuit board 210 by floating it from, for example, other metal members is not limited to the tab or claw portion as described above. For example, the wall portion 21 and the wall portion 22 of the outer shell 221Q may be provided with a slot or notch for inserting the circuit board 210, or a spring portion for clamping and fixing the circuit board 210 between the wall portion 21 and the wall portion 22.

[0061] 16 shows connection of the arm 500 to the first member 221. In a typical embodiment of the present invention, the arm 500 is connected to the first member 221 (e.g., the middle plate 221P) of the fire enclosure. According to a configuration in which the arm 500 is connected to the first member 221 instead of, for example, the rear panel 320 of the housing 300, the first member 221 is made of sheet metal, which makes it easier to ensure rigidity, and the support of the display device 100 by the arm 500 can be made more reliable.

[0062] As in this example, by making the fireproof enclosure also function as a fixture for the arm, it is not necessary to provide a separate part for mounting the arm 500 on the housing 300, and the number of parts can be reduced and the display device can be made thinner. However, this does not prevent the first member 221 of the fireproof enclosure, for example, from further having a mount configured to allow the arm or stand supporting the display device 100 to be detachably attached. For example, the arm 500 may be connected to the first member 221 by screwing or the like via another intermediate member made of sheet metal instead of the intermediate plate 221P.

[0063] Fig. 17 shows an example of the configuration of arm 500. In the example shown in Fig. 17, arm 500 is generally composed of three members. That is, in the configuration shown in Fig. 17, arm 500 includes a base portion 510, an intermediate arm portion 520, and a distal arm portion 530. For ease of explanation, some of the multiple members constituting arm 500 are not shown in Fig. 17.

[0064] The base 510 is a portion that is joined to the first member 221 of the fire enclosure, and has a joint 511 for connection with the intermediate arm 520. This joint 511 can be configured to be rotatable about an axis parallel to the Z axis with respect to the first member 221. The intermediate arm 520 is rotatably joined to the joint 511 about an N1 axis parallel to the Y axis, and the tip arm 530 is rotatably joined to the intermediate arm 520 about an N2 axis parallel to the X axis. A clamp or the like for temporary fixing to a desk, partition, or the like can be attached to the end of the tip arm 530 opposite to the intermediate arm 520.

[0065] As described above, according to the embodiment of the present invention, it is possible to reduce the weight of an electronic device while maintaining the functionality of the enclosure. As is clear from the above description, the present invention is not limited to display devices such as liquid crystal display devices, and can be widely applied to general electronic devices, such as home appliances, personal computers, and mobile devices such as smartphones.

[0066] Various embodiments of the present invention have been described above, but these are presented as examples and are not intended to limit the scope of the invention. The novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The embodiments and modifications thereof are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0067] 1~4: Bend 12: USB connector 20:Top section 20x: 1st opening 20y: 2nd opening 20z: 3rd opening 21, 22: Wall part 21h, 22h: Opening 21t, 22t: Tab (claw part) 22L: Insulating layer 22M: Metal layer 22N: Adhesive layer 23, 24: Legs 30:Aperture 34:Through hole 100:Display device 200: Electrical equipment 201: Insulation sheet 202: Aluminum tape 210: Circuit board 210a:Top surface 220, 220A: Fire Enclosure 221: First member 221P: Intermediate plate 221Q : Outer shell 222: Second member 222S: Main body 222T: Covering material 300: Housing 310: Front panel 312: Bezel 320: Rear panel 330: Internal frame 400: Display panel 400a:Display surface 500: Arm 510: Base 511: Joint 520: Middle arm 530: Tip arm Ap:Aperture Gp :Space

Claims

1. An electronic device, A circuit board; Fire Enclosure and Equipped with The fire enclosure comprises: A first member made of sheet metal; a second member including an insulating layer and a metal layer; Including, the first member has a top surface portion provided with one or more openings and covering a portion of the circuit board; The second member closes the one or more openings, the insulating layer of the second member is located between the metal layer and the circuit board; The first member has a pair of wall portions that rise from the top surface portion and face each other, The wall portion has a support portion extending toward the inside of the first member, The circuit board is held between the pair of walls by being fixed to the support portion of the first member.

2. An electronic device, A circuit board; Fire Enclosure and Equipped with The fire enclosure comprises: A first member made of sheet metal; a second member including an insulating layer and a metal layer; Including, the first member has a top surface portion provided with one or more openings and covering a portion of the circuit board; The second member closes the one or more openings, the insulating layer of the second member is located between the metal layer and the circuit board; an outer edge of the circuit board is located outside an outer edge of the top surface of the first member;

3. 3. The electronic device according to claim 1, The second member is positioned between the top surface portion of the first member and the circuit board.

4. 3. The electronic device according to claim 1, The electronic device, wherein the one or more openings include an opening having a shape in which the length of its widest portion exceeds 1.0 mm.

5. 3. The electronic device according to claim 1, The electronic device, wherein the metal layer is an aluminum foil attached to the insulating layer.

6. 3. The electronic device according to claim 1, The electronic device, wherein the insulating layer is a sheet of polycarbonate.

7. 3. The electronic device according to claim 1, The electronic device, wherein the insulating layer has a thickness of 0.25 mm or more and 0.50 mm or less.

8. 3. The electronic device according to claim 1, The opening has a diameter greater than 1.1 mm or an area greater than 1.1 mm2.

9. 9. The electronic device according to claim 8, The electronic device, wherein the opening has a diameter greater than 2.0 mm or an area greater than 3.2 mm2.

10. A display device including a display panel and a housing, An electronic device according to claim 1 or 2; A third member made of sheet metal; Further equipped with the display panel is fixed to the housing by being covered by the third member from a rear side opposite to a display surface, The display device, wherein the circuit board is supported in the housing by the first member at a distance from the third member.

11. The display device according to claim 10, The display device further comprises an arm connected to the first member.

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