JP2011077262A - Electronic apparatus and method for assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To assemble an electronic apparatus with an excellent outside view easily. <P>SOLUTION: A cylindrical exterior case body 20 is set upside down, an operation unit 32 is inserted into the exterior case body 20, and a shutter button and a power supply button of the operation unit 32 are fitted into a shutter button aperture part 27 and a power supply button aperture part 28. Secondly, an internal frame 30 is inserted into the exterior case body 20 to be screwed by screws 33a to 33d, and a backing metal plate is screwed to a side part 30c of the internal frame 30 by a screw 38, whereby the operation unit 32 is positioned and locked on between an inner wall face of the exterior case body 20 and an operation unit support part 30a of the internal frame 30 by a spacer. Fitting parts 21a and 22a of a right cover 21 and a left cover 22 are so inserted into aperture parts 20a and 20b of the exterior case body 20 as to be screwed by screws 36a to 36d, and then the aperture parts 20a and 20b are plugged by the right cover 21 and the left cover 22, and assembling of a digital camera is finished. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic device, and more particularly, to an electronic device in which an exterior case body is formed in a cylindrical shape and an assembling method thereof.

  External cases of electronic devices such as digital cameras, mobile phones, and portable music players are generally configured so that they can be divided into front and rear cases such as a front case and a rear case in consideration of ease of assembly. Is. In an electronic device configured so that the exterior case can be divided in this manner, the operation buttons are usually assembled to an internal structure such as a printed circuit board. Then, by covering the exterior case from above, the operation buttons are exposed and arranged on the exterior surface through the button holes formed in the exterior case.

  On the other hand, it has been proposed to extrude the outer case into a cylindrical shape without dividing it (for example, Patent Documents 1 and 2). The cylindrical outer case has no advantage in that a seam does not occur in the periphery, so that an excellent appearance can be provided and the rigidity of the outer case can be secured.

  However, in the case of the outer case formed in a cylindrical shape, it is impossible to attach the operation button to the internal structure and then cover the outer case with the operation button. For this reason, for example, in Patent Document 3, an operation button having a claw portion for retaining is configured as a separate part from the internal structure, and the operation button is fitted from the outside into an opening formed in the exterior case. Thus, the operation button is attached to the exterior case by engaging with the edge of the exterior case opening.

JP-A-11-112160 JP 2006-185969 A JP-A-10-154442

  If the operation button is configured as a separate part as in Patent Document 3, there is a drawback that the number of parts increases and the number of assembly steps increases. A method of adding operation buttons from the outside of the exterior case with belt-shaped parts is also conceivable, but in particular when the electronic device is a digital camera, operation buttons such as a shutter button are striped on the top surface of the exterior case, which is the most prominent part. Since it is provided as a part, there is a drawback that the design advantage of the outer case by the cylindrical extrusion molding that there is no seam is significantly impaired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic device that can be easily assembled and has an excellent appearance, and an assembling method thereof.

  An electronic device according to the present invention is formed in a cylindrical shape and has an exterior case body having openings at both ends, a button hole formed at an operation button installation position of the exterior case body, an operation button to be pressed, A flexible member that is attached with an operation button and elastically deforms when the operation button is pressed, and a push-down switch that is provided to face the flexible member and is pressed down when the operation button is pressed are mounted. An operation unit that is integrated with a switch board and is inserted into the exterior case body from the opening, and the operation unit so that at least a top portion of the operation button is exposed to the outside from the button hole of the exterior case body. Is inserted into a predetermined position in the outer case main body, and then inserted into the outer case main body from the opening to be predetermined in the outer case main body. Is attached to the inner frame provided with an operation unit support for fixing the operation unit at a predetermined position between the inner wall surface of the outer case main body and the opening at both ends of the outer case main body. And a cover member for closing the opening.

  The operation unit is provided with a spacer member that fills a gap between the inner wall surface of the outer case main body and the operation unit support portion, and the inner frame is located at a predetermined position in the outer case main body through the spacer member. It is preferable that it is attached to.

  The button hole is preferably formed on the top surface of the exterior case body.

  The electronic device assembling method of the present invention includes a first step of arranging a cylindrical outer case body having openings at both ends so that a button hole formed at an operation button installation position faces downward, and a pressing operation. An operation button to which the operation button is attached, a flexible member that is elastically deformed by a pressing operation of the operation button, and a press that is provided to face the flexible member and is pressed down by the pressing operation of the operation button An operation unit integrated with a switch board on which a switch of the type is integrated is inserted into the outer case main body through the opening, and is assembled so that at least the top of the operation button is exposed to the outside from the button hole A second step and an internal frame having an operation unit support part for supporting the operation unit is inserted into the exterior case body through the opening. A third step of fixing the operation unit at a predetermined position between an inner wall surface of the outer case main body and the operation unit support portion by attaching the operation unit to a predetermined position in the outer case main body, and both ends of the outer case main body And a fourth step of closing the opening by attaching a cover member to the opening.

  According to the present invention, the cylindrical outer case main body is disposed so that the button hole faces downward, and the operation unit is incorporated into the outer case main body so that at least the top of the operation button is exposed from the button hole. By attaching the frame to a predetermined position in the outer case main body, the operation unit is fixed at a predetermined position between the inner wall surface of the outer case main body and the operation unit support portion of the inner frame. And the electronic device of the outstanding external appearance, and its assembly method can be provided.

  In addition, since the operation unit is provided with a spacer member, and the inner frame is attached to a predetermined position in the outer case main body through the spacer member, the step of attaching the inner frame to the predetermined position in the outer case main body naturally The operation unit is fixed at a predetermined position between the inner wall surface of the outer case main body and the operation unit support portion of the inner frame, and the assembly of the electronic device becomes easier.

  In addition, since the button hole is formed on the top surface of the exterior case body, only the top of the operation button is exposed from the top surface of the most prominent exterior case body, and the exterior of the exterior case body formed in a cylindrical shape is exposed. There is no loss of beauty.

1 is a front perspective view illustrating an appearance of a digital camera that is an embodiment of the present invention. It is an assembly development view of a digital camera. It is a perspective view which shows the external appearance of an operation unit. It is a flowchart which shows the main assembly sequences of a digital camera. It is explanatory drawing which shows a mode that an operation unit is inserted in an exterior case main body. It is explanatory drawing which shows a mode that an internal frame is inserted in an exterior case main body. It is explanatory drawing which shows a mode that an internal frame and an operation unit are screwed in the predetermined position in an exterior case main body. It is explanatory drawing which shows a mode that a right-and-left cover is screwed. It is explanatory drawing which shows the state which the digital camera assembled.

  In FIG. 1 showing the appearance of a digital camera which is an embodiment of the electronic apparatus of the present invention, an outer case 12 of the digital camera 10 is formed in a thin rectangular box shape, and a photographing lens 13 and a front face thereof are formed. A strobe light emitting unit 14 is provided. A shutter button 15 and a power button 16 are provided on the upper surface, and a liquid crystal display used as an electronic viewfinder or the like and a rear operation unit are provided on the rear surface, although not shown.

  The photographic lens 13 is constituted by a zoom lens using a so-called bending optical system, and is housed and arranged in the exterior case 12 as a lens unit in which a CCD is assembled at the rear end of the lens barrel. The front lens is disposed at the upper right end of the front surface of the outer case 12.

  The strobe light emitting unit 14 is configured using a xenon tube as a light source, and is housed and disposed inside the outer case 12 as a strobe unit including a main capacitor and the like. The light emitting unit is arranged in parallel with the photographing lens 13.

  The shutter button 15 is a two-stage push button that can be pressed halfway and fully, and is disposed on the upper left end (viewed from the front) of the outer case 12. The digital camera 10 performs AE and AF processing when the shutter button 15 is half-pressed, and performs actual photographing processing when the shutter button 15 is fully pressed.

  In FIG. 2 which shows an assembly development view of the digital camera 10, an exterior case 12 includes an exterior case body 20 formed in an elongated bowl-like cylindrical shape, and a right cover 21 attached to openings 20a and 20b at both right and left ends thereof. It consists of a left cover 22.

  The outer case main body 20 is formed in a rectangular cylindrical shape having both left and right end surfaces opened by extruding a metal (for example, an aluminum alloy, a magnesium alloy, stainless steel, or the like). Since the exterior case body 20 is formed by extrusion, the cross-sectional shape (projected shape) parallel to the opening surfaces at both ends thereof is formed in the same shape at any position. And the outer periphery is formed in a seamless shape.

  The exterior case body 20 is formed with a lens opening 25 in which the front lens of the photographic lens 13 is disposed on the front surface and a strobe opening 26 in which the strobe light emitting unit 14 is disposed, and the top of the shutter button 15 is disposed on the upper surface. A shutter button opening 27 that is exposed and a power button opening 28 that exposes the top of the power button 16 are formed. Although not shown, a display opening in which the above-described display is disposed and a back operation unit opening in which the back operation unit is disposed are formed on the back surface.

  The right cover 21 and the left cover 22 are each formed in a rectangular plate shape by a resin material, and the outer peripheral shape thereof is the same shape as the outer peripheral shape of the exterior case body 20. On the inner side surfaces (attachment surfaces to the outer case main body 20) of the right cover 21 and the left cover 22, fitting portions 21a and 22a having shapes corresponding to the inner peripheral shape of the outer case main body 20 are formed to protrude. Yes. The right cover 21 and the left cover 22 are attached to the outer case body 20 by screwing, which will be described later, after fitting the fitting portions 21a and 22a into the openings 20a and 20b at both ends of the outer case body 20, respectively.

  An inner frame 30 is accommodated inside the outer case 12. Although not shown, internal components such as various circuit boards, lens units, display units, strobe units, battery mounting portions, memory card slots and the like constituting the digital camera 10 are attached to the internal frame 30 in advance, It is inserted from the opening 20 a of the case body 20 and accommodated in the exterior case 12.

  The inner frame 30 is resin-molded (or formed by bending a metal plate such as stainless steel), and the outer peripheral shape thereof, except for an operation unit support portion 30a for supporting an operation unit 32 described later in detail, The outer case body 20 is formed so as to substantially match the shape of the inner peripheral portion of the outer case body 20. In other words, it corresponds to the shape of the inner peripheral portion of the exterior case body 20 formed as a substantially rectangular box-shaped space, and is formed in a substantially rectangular box shape with the back side and one side surface opened. Therefore, when housed in the outer case body 20, the inner frame 30 is housed without rattling inside the outer case body 20.

  The inner frame 30 inserted into the outer case main body 20 is fixed to the outer case main body 20 at a predetermined position by screwing the upper surface and two lower surfaces with screws 33a to 33d. Through holes 34a to 34d for passing the screws 33a to 33d are formed in two places on the upper surface and two lower surfaces of the exterior case body 20, respectively.

  In the inner frame 30, screw holes 35a to 35d into which screws 33a to 33d inserted into the through holes 34a to 34d are screwed are formed corresponding to the through holes 34a to 34d. Further, a screw hole 35e for fixing the operation unit 32 is formed in a side portion of the inner frame 30.

  In the vicinity of the through holes 34a to 34d, through holes 37a to 37d for fixing the right cover 21 and the left cover 22 to the openings 20a and 20b of the exterior case body 20 with screws 36a to 36d, respectively, are formed. Further, screw holes 38a to 38d into which screws 36a to 36d are screwed are formed on the upper and lower surfaces of the fitting portions 21a and 22a of the right cover 21 and the left cover 22, respectively. The through holes 34 a to 34 d and 37 a to 37 d are countersunk so that the heads of the inserted screws 33 a to 33 d and 36 a to 36 d do not protrude from the surface of the exterior case body 20.

  On the upper surface of the internal frame 30, an operation unit support portion 30 a that supports the operation unit 32 and functions as an attachment portion of the operation unit 32, a portion on the left side of the attachment opening 30 b of the strobe light emitting unit 14 is more than a portion on the right side. It is formed one step down. Further, as will be described later, the side portion 30c perpendicular to the operation unit support portion 30a also functions as a mounting portion for the operation unit 32 in cooperation with the operation unit support portion 30a.

  The side portion 30c is formed with an opening portion 30d through which a connection terminal portion of a flexible printed circuit board (hereinafter referred to as a flexible substrate) described later of the operation unit 32 is inserted and led into the internal frame 30. A lens opening 30e is formed at a position adjacent to the mounting opening 30b so as to face the lens opening 25 of the exterior case body 20 and expose the front lens of the photographing lens 13.

  When the inner frame 30 is mounted in the outer case body 20, the operation unit support portion 30 a is positioned below the shutter button opening 27 and the power button opening 28 formed in the outer case body 20. And the operation unit support part 30a is arrange | positioned in parallel with the predetermined clearance gap (clearance) with respect to the ceiling surface (henceforth an inner wall ceiling surface) of the inner peripheral part of the exterior case main body 20. FIG.

  Of the four screw holes 35a to 35d for fixing the inner frame 30 to the exterior case body 20, a screw hole 35b formed at the upper left corner of the inner frame 30 is formed in the operation unit support portion 30a. Since the operation unit 32 is fixed by the screw 33b between 30a and the inner wall ceiling surface of the exterior case body 20, the screw 33b is longer than the other screws 33a, 33c, and 33d. A screw hole 35e for fixing the operation unit 32 to the inner frame 30 is formed in the side portion 30c of the inner frame 30 in cooperation with the screw 33b. A screw 38 is screwed into the screw hole 35e.

  As shown in FIG. 3, the operation unit 32 has a flexible substrate 42 (switch substrate) and an elastic pusher member 43 (flexible) on the upper surface of the longer plate portion 41a of the L-shaped backing sheet metal 41. The resin shutter button 15 and the power button 16 are bonded and fixed to the upper surface of the pusher member 43, respectively. The surface of the flexible substrate 42 that is in contact with the upper surface of the plate portion 41a is bonded to the upper surface of the plate portion 41a with a double-sided tape.

  A cylindrical spacer 45 is integrally formed at one end of the pusher member 43, and when the pusher member 43 is screwed to the upper surface of the plate portion 41 a of the backing sheet metal 41, a thread formed in the central portion of the spacer 45 is formed. The hole 45a coincides with the position of the through hole 46a (see FIG. 5 and the like) formed in the plate portion 41a. In addition, another through hole 46 b is formed in the shorter plate portion 41 b that is perpendicular to the plate portion 41 a of the backing sheet metal 41.

  The screw 33b is inserted into the through holes 34b, 45a, 46a and screwed into the screw holes 35b formed in the operation unit support portion 30a, so that the operation unit 32 is connected to the operation unit support portion 30a and the outer case main body 20. Installed between the ceiling of the inner wall. Further, the screw 39 (see FIG. 2) is inserted into the through hole 46b of the plate portion 41b and screwed into the screw hole 35e of the side portion 30c of the internal frame 30, thereby positioning and fixing the operation unit 32. Done.

  One end portion of the flexible substrate 42 is formed in an elongated shape, and the tip portion thereof is a connection terminal portion 42a. The connection terminal portion 42 a is inserted into the internal frame 30 through the opening 30 d of the internal frame 30 and is connected to a control circuit board (not shown) for controlling the digital camera 10 in the internal frame 30. The

  A switch 48 positioned below the shutter button 15 and a switch 49 positioned below the power button 16 are attached to the upper portion of the flexible substrate 42. On the other hand, on each lower surface of the pusher member 43 to which the shutter button 15 and the power button 16 are adhered and fixed, pushers 51 and 52 (see FIG. 5) having a cylindrical shape and a hemispherical tip are integrated with the pusher member 43. It is resin molded. When no pressing force is applied to the shutter button 15 or the power button 16, the switches 48 and 49 are not pressed by the pushers 51 and 52 due to the elasticity of the pusher member 43.

  The switch 48 is composed of a two-stage push switch, and can be half-pressed / fully pressed by the shutter button 15. The switch 49 is a power switch that is alternately turned on / off every time it is depressed by the power button 16.

  The pushers 51 and 52 (see FIG. 5) are formed integrally with one pusher member 43. However, the pusher 52 depresses the switch 49 by pressing the shutter button 15, or conversely the power source. The balance between the elastic characteristic of the pusher member 43 and the strength of the push-down resistance of the switches 48 and 49 and the like are well configured so that an interference operation in which the pusher 51 depresses the switch 48 does not occur due to the pressing operation of the button 16. ing.

  When the switch 48 is half-pressed by the pusher 51 (see FIG. 5), a through image is displayed on the AE (automatic exposure), AF (autofocus), and the liquid crystal display on the back. Further, while the half-pressed state is maintained, AE, AF and through image display are continuously performed. When the switch 48 is fully pressed by the pusher 51, a frame image is read out from the CCD, and through various signal processing, main photographing is performed in which image data is stored in a memory card. When the force to press the shutter button 15 is released, the pusher member 43 is elastically restored, and the push of the switch 48 by the pusher 51 is released.

  Since the shutter button 15 is pushed down in two stages of half-pressing and full-pressing, the top portion protrudes from the surface of the outer case body 20 by, for example, about 2 to 3 mm. One power button 16 has a very small amount of protrusion (for example, about 0.5 mm) from the surface of the outer case body 20 so that the power button 16 cannot be pushed down carelessly.

  The shutter button 15 is formed of a button main body portion 15a formed in a columnar shape and a flange portion 15b formed so as to protrude from the lower end portion of the button main body portion 15a to the outer periphery. Similarly, the power button 16 is also formed of a button main body portion 16a and a flange portion 16b. Since the outer diameters of the button main body portions 15a and 16a are slightly smaller than the inner diameters of the shutter button opening 27 and the power button opening 28 and formed with less play, the upside down is reversed in the assembly process described later. When the button body portions 15a and 16a are inserted into the shutter button opening portion 27 and the power button opening portion 28 from the inside of the outer case body 20 (see FIG. 5), the operation unit 32 is inadvertently detached from the outer case body 20. There is no.

  A method for assembling the digital camera 10 configured as described above will be described with reference to the flowchart of FIG. 4 and FIGS. First, as shown in FIG. 5, the exterior case body 20 is placed on a work table or the like with the top and bottom reversed. Then, the operation unit 32 is inserted into the exterior case body 20 through the opening 20b, and the shutter button 15 and the power button 16 are fitted into the shutter button opening 27 and the power button opening 28 (st1). As described above, the two button members are fitted into the respective openings with little play, so that the operation unit 32 is set at a predetermined position in the exterior case body 20 in a stable posture. At the same time, the through hole 45 a of the spacer 45 coincides with the position of the through hole 34 b of the exterior case body 20. Note that “st” (step meaning) 1 in the parentheses corresponds to “st1” shown in FIG.

  Next, as shown in FIG. 6, an internal frame 30 containing internal components such as various circuit boards, lens units, display units, and strobe units is inserted into the exterior case body 20 through the opening 20a (st2 ). In this insertion operation, the connection terminal portion 42 a of the flexible substrate 42 is inserted into the internal frame 30 from the opening 30 d of the internal frame 30. Then, the flexible substrate 42 is connected to the circuit board in the internal frame 30 by inserting the connection terminal portion 42 a into a connector (not shown) of the circuit board in the internal frame 30.

  As shown in FIG. 7, the inner frame 30 is mounted on the exterior until the edge angle of the operation unit support portion 30 a of the inner frame 30 contacts the inner corner of the L-shaped backing sheet metal 41 of the operation unit 32. When inserted into the case body 20, the positions of the screw holes 35 b, 35 c, 35 d of the inner frame 30 coincide with the positions of the through holes 34 a, 34 c, 34 d of the exterior case body 20, and the through holes of the backing sheet metal 41 The position of the screw hole 35e of the inner frame 30 matches the position of 46b.

  The screws 33a to 33d are inserted from the through holes 34a to 34d of the outer case body 20 and screwed into the screw holes 35a to 35d, and the screws 39 are inserted from the through holes 46b of the backing metal plate 41 to the screw holes 35e. Screw together. As a result, as shown in FIG. 8, the inner frame 30 is fixed in the outer case body 20, and at the same time, the operation unit 32 is positioned and fixed between the inner wall ceiling surface of the outer case body 20 and the operation unit support portion 30a. (St3). At this time, the spacer 45 of the operation unit 32 defines the space between the inner wall ceiling surface of the exterior case main body 20 and the operation unit support portion 30a, so that the inner frame 30 is deformed by screwing the screws 33b more than necessary (internal frame). 30 pull-in) can be prevented.

  Subsequently, the fitting portions 21a and 22a of the right cover 21 and the left cover 22 are inserted into the openings 20a and 20b. Then, the screws 36a to 36d are inserted from the through holes 37a to 37d and screwed into the screw holes 38a to 38d of the fitting portions 21a and 22a (st4). Accordingly, as shown in FIG. 9, the openings 20a and 20b are closed by the right cover 21 and the left cover 22, and the assembly of the digital camera 10 is completed.

  As described above, according to this embodiment, the operation unit 32 and the inner frame 30 are sequentially inserted into the outer case body 20 and screwed, and finally the left and right covers 21 and 22 are screwed to the outer case body 20. The digital camera 10 can be assembled in a very simple work process. As a result, it is possible to reduce the assembling effort of the digital camera 10 and shorten the assembling time, thereby contributing to the cost reduction of the digital camera 10. Further, since the tops of the shutter button 15 and the power button 16 are only exposed to the top surface of the exterior case body 20 with a slight protrusion amount from the surface of the exterior case body 20, the exterior case body 20. The digital camera 10 can obtain a beautiful appearance without impairing the seamless feeling due to the hollow extrusion molding.

  In the embodiment described above, the flexible substrate and the pusher member 43 are screwed to the upper surface of the plate portion of the backing sheet metal. However, for example, welding or caulking may be used without being limited to screwing.

  In the above embodiment, the operation unit is an example in which a shutter button, a power button, and a flexible board on which those switches are mounted are unitized. However, the present invention is not limited to this, for example, only the shutter button. And a flexible substrate may be unitized, or a zoom operation button and its control substrate may be unitized.

  In the above embodiment, the present invention is applied to a digital camera. However, the present invention can also be applied to electronic devices other than cameras such as a mobile phone, a portable music player, and a PDA. For example, when it is applied to a mobile phone, the main body is extruded into a cylindrical shape, a key hole is formed in the main body, and an operation unit in which the key and its switch are unitized is inserted from the inside of the main body. To be exposed from the key hole. Thereafter, an internal frame containing various circuit boards and the like may be inserted into the main body and screwed.

DESCRIPTION OF SYMBOLS 10 Digital camera 12 Exterior case 15 Shutter button 16 Power button 20 Exterior case main body 21 Right cover 22 Left cover 27 Shutter button opening 28 Power button opening 30 Internal frame 30a Operation unit support part 32 Operation unit 41 Backing sheet metal 42 Flexible board 43 Pusher member 45 Spacer 48, 49 Switch 51, 52 Pusher

Claims (4)

An outer case body formed in a cylindrical shape and having openings at both ends;
A button hole formed at the operation button installation position of the exterior case body;
An operation button to be pressed, a flexible member to which the operation button is attached and elastically deformed by the pressing operation of the operation button, and a flexible member provided to face the flexible member. An operation unit that is integrated with a switch board mounted with a push-down switch to be pushed down, and is inserted into the exterior case body from the opening,
After the operation unit is assembled at a predetermined position in the exterior case body so that at least the top of the operation button is exposed to the outside from the button hole of the exterior case body, the operation unit is inserted into the exterior case body from the opening. And an inner frame provided with an operation unit support portion for fixing the operation unit at a predetermined position between the inner surface of the outer case main body by attaching it to a predetermined position in the outer case main body,
An electronic device comprising: a cover member attached to the opening at both ends of the exterior case body, and covering the opening.   The operation unit is provided with a spacer member that fills a gap between the inner wall surface of the outer case main body and the operation unit support portion, and the inner frame is located at a predetermined position in the outer case main body through the spacer member. The electronic device according to claim 1, wherein the electronic device is attached to the electronic device.   The electronic device according to claim 1, wherein the button hole is formed on a top surface of the exterior case main body. A first step of disposing a cylindrical outer case body having openings at both ends so that a button hole formed at an operation button installation position faces downward;
An operation button to be pressed, a flexible member to which the operation button is attached and elastically deformed by the pressing operation of the operation button, and a flexible member provided to face the flexible member. An operation unit integrated with a switch board on which a push-down switch to be pushed down is integrated is inserted into the exterior case body from the opening, and at least the top of the operation button is exposed to the outside from the button hole. A second step of incorporating
An internal frame provided with an operation unit support part for supporting the operation unit is inserted into the exterior case main body from the opening and attached to a predetermined position in the exterior case main body, thereby attaching the operation unit to the exterior A third step of fixing at a predetermined position between the inner wall surface of the case body and the operation unit support;
An electronic device assembling method comprising: a fourth step of attaching a cover member to the openings at both ends of the exterior case main body and closing the openings.

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