TWI679524B - Hard disk drive carrier - Google Patents

Abstract

A hard disk carrier plate includes a carrier plate and a clamping component. The carrying plate has two sides opposite to and parallel to the installation direction of the hard disk carrying plate. The fixing component is kept at a distance from the two sides. The fixing component includes a fixing component, an operating component, and a fixing component. The fixing member is fixed on the bearing plate. The operation member is slidably provided on the fixing member. The operating member has a guide groove. The guide slot includes a fixed clamping section and a tapered section. The card firmware includes a connected head and body. The width of the head is larger than the width of the body, and the body slides through the guide groove and the fixing member. When the operating member is located at the clamping position, the head is located at the clamping section, and the body is fixed at the casing. When the operating member is moved from the clamping position to the releasing position, the tapered section is moved toward the head so that the operating member abuts the head and the head is separated from the guide slot to separate the body from the casing.

Description

Hard disk carrier

The invention relates to a hard disk carrier disk, in particular to a hard disk carrier disk having a fixing component located between two sides of the carrier plate.

The server host is equipped with multiple hard disks for storing programs, files, and data. Before the hard disk is loaded into the servo host, it is first installed on the hard disk carrier, and then the hard disk carrier with the hard disk is installed in the hard disk slot of the servo host. Generally speaking, the base of the hard disk carrier is provided with a pivoting buckle arm, and is fixed on the side wall of the casing through the pivoting buckle arm. In other words, the chassis of the servo host must have side walls to allow the hard disk carrier to be properly fixed to the chassis.

However, since the thickness of the side wall of the case occupies a lot of space inside the case, the space in the servo host that can be used to accommodate the hard disk carrier carrying the hard disk is reduced by the side wall. Therefore, the maximum number of hard disks that can be mounted in the servo host is limited, and it is difficult to further increase it. In view of this, how to maximize the maximum number of hard disks that a server host can carry within the limited space of the server is really one of the goals for researchers in this field.

The present invention is to provide a hard disk carrier disk, so as to solve the problem that it is difficult to further increase the maximum number of hard disks that a servo host can carry in the prior art.

A hard disk carrier disc disclosed in one embodiment of the present invention is used to carry a hard disk and install a casing. The hard disk carrier includes a carrier board and a fastening component. The carrying plate is used to carry the hard disk. The supporting plate has a first side and a second side opposite to each other, and the first side and the second side are parallel to the mounting direction of the hard disk supporting disk in the casing. The fixing component is disposed on the bearing plate and maintains a distance from the first side and the second side, respectively. The fixing component includes a fixing component, an operating component, and a fixing component. The fixing member is fixed on the bearing plate. The operation member is slidably provided on the fixing member. The operating member has a guide groove. The guide groove includes a fastening section and a tapered section connected to each other. The width of the tapered section gradually decreases from one side of the connecting fastening section to a direction away from the fastening section. The card firmware includes a head and a body connected together. The width of the head is greater than the width of the body, the head has a guide slope, and the body is slidably provided with a guide groove and a fixing member. The operating member can slide between a clamping position and a releasing position. When the operating member is in the clamping position, the head is located in the clamping section, and the body is used for clamping in the casing. When the operating member is moved from the clamping position to the releasing position, the tapered section is moved toward the head so that the operating member abuts the guide slope of the head and the head is separated from the guide groove to separate the body from the casing .

According to the hard disk carrier disc disclosed in the above embodiment, the clamping component is kept at a distance from the first side and the second side of the mounting direction of the parallel hard disk carrier, respectively, so that the clamping component is not away from the casing The side wall is fixed. Therefore, the side wall of the cabinet can be omitted to increase the space for the hard disk carrying disk in the cabinet to accommodate the hard disk, thereby increasing the maximum number of hard disks that the cabinet can accommodate.

In addition, in the state where the operating member is in the fixing position, the head of the fixing member is located in the fixing section of the guide groove, and the body is fixed to the casing, so even if the side wall of the casing is omitted, the hard disk is carried. The disk can still be properly secured to the case.

The above description of the content of the present invention and the description of the following embodiments are used to demonstrate and explain the principle of the present invention, and provide further explanation of the scope of the patent application of the present invention.

Please refer to FIG. 1. FIG. 1 is an exploded view of a hard disk carrying disk carrying a hard disk and being separated from a casing according to a first embodiment of the present invention.

The present embodiment discloses a hard disk carrier disk 10, which is used to carry a hard disk 20 and is provided with a casing 30. The hard disk 20 is, for example, a hard disk of the NVME (Non-Volatile Memory Express) standard. The casing 30 is, for example, a casing of a servo host, and a plate body 31 of the casing 30 for carrying the hard disk carrying disk 10 is provided with two limit guides 32, a projection 33, a positioning hole 34, and four rivets. 35. The projection 33, the positioning hole 34 and the four rivets 35 are all located between the two limit guide rails 32. The protrusion 33 is closer to the opening of the casing 30 than the positioning hole 34. One of the two rivets 35 corresponds to one of the limiting guide rails 32, and the other of the two rivets 35 corresponds to the other limiting guide rail 32. The protrusion 33 has a guiding inclined surface 36 facing the opening and a stopping surface 37 facing away from the guiding inclined surface 36 (refer to FIG. 6). Each rivet 35 has a limiting rivet head 38, and there is a gap between each limiting rivet head 38 and the plate body 31. The purpose of the limit guide rail 32, the projection 33, the positioning hole 34 and the rivet 35 of the cabinet 30 will be described in detail later.

Please refer to FIGS. 2 to 4. FIG. 2 is a schematic perspective view of the hard disk carrier disk of FIG. 1. FIG. 3 is a schematic perspective view of an operating member of the fastening component of FIG. 2. FIG. 4 is a schematic front view of the hard disk carrier disk of FIG. 2.

The hard disk carrier tray 10 includes a carrier board 100 and a fastening component 200. The carrier plate 100 includes a first plate 110, a second plate 120, a third plate 130, and a fourth plate 140. The second plate member 120 is separated from the third plate member 130 by a distance, and the second plate member 120 and the third plate member 130 are respectively connected to two opposite sides of the first plate member 110 and extend in the same direction. The fourth plate member 140 is connected to the first plate member 110 and is located between the second plate member 120 and the third plate member 130.

The second plate member 120 has two perforations 121 and the third plate member 130 has two perforations 131. The through holes 121 and 131 are respectively used to align with a plurality of lock holes (not shown) of the hard disk 20. The method for fixing the hard disk 20 to the hard disk carrying disk 10 is to pass through the holes 121 and 131 through a plurality of screws, respectively, and lock the plurality of lock holes on the bottom surface of the hard disk 20.

In this embodiment, the fourth plate 140 has, for example, a display surface 141 and an abutment surface 142 opposite to each other. Before passing the screws through the perforations 121 and 131 and locking them to the lock holes of the hard disk 20, the hard disk 20 can be abutted against the abutting surface 142 of the fourth plate 140 to locate the hard disk 20 first. Position to help the keyholes of the hard disk 20 align with the holes 121, 131, respectively. In addition, when the hard disk carrier 10 is installed in the casing 30, the display surface 141 is exposed through the opening of the casing 30. The display surface 141 of the fourth plate 140 can identify, for example, the capacity of the hard disk 20 carried by the hard disk carrier 10.

The carrier board 100 of this embodiment further includes a first rail member 150 and a second rail member 160. The first rail member 150 and the second rail member 160 are respectively connected to the second plate member 120 and the third plate member 130 and are located between the second plate member 120 and the third plate member 130. The first guide member 150 and the second plate member 120 together form a first limiting slot 170, and the second guide member 160 and the third plate member 130 together form a second limiting slot 180, the first limiting slot 170 and The second limiting slots 180 are respectively used to receive the two limiting guide rails 32. In addition, the first guide member 150 has a third limiting groove 151, and the second guide member 160 has a fourth limiting groove 161. The third limit slot 151 and the fourth limit slot 161 are located between the first limit slot 170 and the second limit slot 180, and the third limit slot 151 and the fourth limit slot 161 are respectively used to accommodate two Limiting rivet head 38.

In this embodiment, the second plate member 120 has a first side edge 122, and the third plate member 130 has a second side edge 132. The first side 122 is located on one side of the second plate 120 away from the third plate 130, and the second side 132 is located on one side of the third plate 130 away from the second plate 120. The first side edge 122 is, for example, parallel to the second side edge 132, and the first side edge 122 and the second side edge 132 are parallel to the mounting direction of the hard disk carrier 10 mounted on the chassis 30.

The fixing component 200 is disposed on the first plate 110 of the carrier board 100, and the display surface 141 of the fourth plate 140 faces the fixing component 200, and the fixing component 200 and the first side 122 and the second side 132 are respectively Keep a distance. In detail, the fixing assembly 200 includes a fixing member 210, an operation member 220, and a fixing member 230.

The fixing member 210 includes an assembly portion 211 and a guide portion 212 connected to each other. The assembling portion 211 is assembled on the first plate 110 of the carrier plate 100, and the guiding portion 212 has two opposite grooves 2121. The operating member 220 includes a plate portion 221, a first side portion 222 and a second side portion 223. The plate portion 221 includes an operation section 2211 and a body section 2212 connected to each other, and a width W1 of the operation section 2211 is greater than a width W2 of the body section 2212. The first side portion 222 and the second side portion 223 are respectively connected to two opposite sides of the body section 2212 and extend in the same direction, and the body section 2212 of the plate section 221, the first side section 222, and the second side section 223 together form a Chute 224. The first side portion 222 has a first bending structure 2221, and the second side portion 223 has a second bending structure 2231. The first bending structure 2221 extends toward the second side portion 223, and the second bending structure 2231 extends toward the first side portion 222. The guide portion 212 of the fixing member 210 is located in the sliding groove 224, and the first bending structure 2221 and the second bending structure 2231 are slidably located in the two grooves 2121, respectively.

The plate portion 221 of the operating member 220 has a guide groove 2213 and an inner wall surface 2214 forming the guide groove 2213, and the guide groove 2213 and the inner wall surface 2214 are located on the body section 2212 of the plate portion 221. The guide groove 2213 includes a fastening section 2213a and a tapered section 2213b connected to each other. The width of the tapered section 2213b gradually decreases from one side of the connecting and fixing section 2213a to a direction away from the fixing section 2213a. The normal direction of the inner wall surface 2214 is a direction away from the first plate 110 of the carrier plate 100. That is to say, the inner side wall surface 2214 does not face the first plate member 110, but faces in a direction away from the first plate member 110.

The fixing member 230 includes a head portion 231 and a body portion 232 connected to each other. The width W3 of the head portion 231 is larger than the width W4 of the body portion 232. The head 231 has a guide inclined surface 2311, and the body portion 232 slidably passes through the guide groove 2213 and the guide portion 212 and the assembly portion 211 of the fixing member 210.

In this embodiment, a side of the first plate 110 facing away from the fixing component 200 has a bottom surface 111, and an end of the body portion 232 of the fixing member 230 away from the head portion 231 has an edge 2321. In addition, the operating member 220 can slide between a locking position and a releasing position, and the locking position is closer to the fourth plate 140 than the releasing position.

Next, the process of loading the hard disk carrying disk 10 carrying the hard disk 20 into the casing 30 will be described below. Please refer to FIG. 1, FIG. 5, and FIG. 6 together. FIG. 5 is a schematic front view of the hard disk carrying disk of FIG. 2 being installed in the casing. FIG. 6 is a schematic cross-sectional view of the hard disk carrier tray of FIG. 2 being installed in a casing.

First, align the first limiting slot 170 and the second limiting slot 180 of the hard disk carrying disk 10 carrying the hard disk 20 with the two limiting rails 32 of the casing 30, respectively, and then align the hard disk carrying disk 10 in the direction D (that is, its installation direction) is slightly pushed into the casing 30, so that the hard disk carrier 10 is guided by the two limit guides 32, and the first guide member 150 and the second guide member 160 enter the limit rivet heads, respectively. The gap between 38 and the plate body 31 allows the hard disk carrier 10 to be pre-loaded on the plate body 31 of the cabinet 30. Then, the operating section 2211 of the plate portion 221 of the operating member 220 is applied, so that the operating member 220 first slides toward the fourth plate 140 and is located at the fixing position, and then drives the overall hard disk carrying tray 10 deeper into the casing 30. At this time, the head portion 231 of the fixing member 230 is located in the fixing portion 2213a (as shown in FIG. 3), and the guide inclined surface 2311 of the head portion 231 abuts the inner wall surface 2214 and surrounds the fixing portion 2213a. A distance between the end edge 2321 of the body portion 232 and the bottom surface 111 of the first plate 110 is adjacent to the protrusion 33 of the casing 30.

During the aforementioned process of applying force to the operation section 2211 of the plate portion 221, the operation member 220 does not necessarily slide toward the fourth plate member 140. For example, if the operating member 220 is already in the locked position before the force is applied to the operating member 220, the action of pushing the operating member 220 will not cause the operating member 220 to move, but will only drive the overall hard disk carrying tray 10 more Into the case 30.

Next, please refer to FIG. 7 and FIG. 8. FIG. 7 is a schematic cross-sectional view of the card fastener of FIG. 6 being lifted by being guided by the projections of the casing. FIG. 8 is a schematic cross-sectional view illustrating that the card firmware of FIG. 7 is fixed to the casing.

The operation section 2211 of the operation member 220 is continuously pushed, so that the hard disk carrying tray 10 moves and goes deeper into the casing 30. During the movement of the hard disk carrier 10, the end edge 2321 of the body portion 232 of the fixing member 230 abuts on the guiding inclined surface 36 of the projection 33, so that the entire fixing member 230 is guided by the guiding inclined surface 36. Lifting upwards, the distance between the end edge 2321 of the body portion 232 of the fastener 230 and the bottom surface 111 of the first plate 110 will gradually decrease. Therefore, after continuing to move the hard disk carrier 10, the body portion 232 of the card holder 230 can pass through the bump 33. Moreover, under the action of gravity, the fastener 230 will fall, so that the body portion 232 is inserted into the positioning hole 34 and stopped by the stop surface 37 of the projection 33. In this way, the positioning hole 34 and the stop surface 37 of the projection 33 restrict the reverse movement of the hard disk carrier disk 10 in the direction D, and complete the action of installing the hard disk carrier disk 10 in the casing 30.

Next, please refer to FIG. 9. FIG. 9 is a schematic cross-sectional view of the hard disk carrier tray installed in the casing of FIG. 2.

In this embodiment, in addition to the two guide rails 32 providing the effect of guiding the hard disk carrier disk 10, after the hard disk carrier disk 10 is installed in the casing 30, the first rail member 150 and the second rail member 160 is located between the two limit guide rails 32, so the two limit guide rails 32 provide the horizontal limit effect of the hard disk carrier disk 10.

In addition, during the process of mounting the hard disk carrier tray 10 into the casing 30, the first rail member 150 and the second rail member 160 of the carrier plate 100 will enter between the limiting rivet head 38 and the plate body 31 of the casing 30, respectively Therefore, after the hard disk carrying tray 10 is installed in the casing 30, these limiting rivet heads 38 are respectively located in the third limiting groove 151 and the fourth limiting groove 161. Therefore, the limiting rivet head 38 and the plate body 31 provide the vertical limiting effect of the hard disk carrier 10.

In the foregoing description, the fastener 230 is inserted into the positioning hole 34 by falling through gravity after passing through the bump 33, but is not limited thereto. In other embodiments, an elastic member may be provided on the card member to allow the card member passing through the bump to fall by the elastic force of the elastic member.

Next, please refer to Figs. 3, 8 and 10 together. Fig. 10 is a schematic cross-sectional view of the card firmware of Fig. 8 separated from the casing.

When the hard disk carrier 10 needs to be detached from the casing 30, the operating section 2211 of the operating member 220 can be pulled in the direction D to move the operating member 220 from the clamping position to the releasing position. When the operating member 220 is moved from the clamping position to the releasing position, the tapered section 2213b of the guide groove 2213 moves toward the head 231 of the fastener 230 so that the part of the inner wall surface 2214 surrounding the tapered section 2213b abuts the head 231 The guide slope 2311 is separated from the guide groove 2213 and the body 232 is separated from the positioning hole 34. At this time, the distance between the end edge 2321 of the body portion 232 of the fastener 230 and the plate body 31 is greater than the height H of the bump 33, so continue to pull the operating section 2211 in the direction D to make the hard disk bear. The disk 10 is detached from the casing 30.

In this embodiment, since the plate portion 221 of the operation member 220 has an operation section 2211 that is wider than the body section 2212, the user can operate the operation section 2211 by hand, and it is easier to push or pull the operation member 220. In addition, the operation section 2211 of the plate portion 221 of the operation member 220 in this embodiment may further include at least one anti-slip structure 2211a. Thereby, the friction between the user's hand and the operation section 2211 is increased, so that the user can more easily push or pull the operation member 220.

According to the hard disk carrier disc disclosed in the above embodiment, the clamping component is kept at a distance from the first side and the second side of the mounting direction of the parallel hard disk carrier, respectively, so that the clamping component is not separated from the casing. The side wall is fixed. Therefore, the side wall of the cabinet can be omitted to increase the space for the hard disk carrying disk in the cabinet to accommodate the hard disk, thereby increasing the maximum number of hard disks that the cabinet can accommodate.

In addition, in the state where the operating member is in the fixing position, the head of the fixing member is located in the fixing section of the guide groove, and the body is fixed to the casing, so even if the side wall of the casing is omitted, the hard disk is carried. The disk can still be properly secured to the case.

In addition, in the case where the hard disk carrier disk is installed in the casing, the positioning holes and projections limit the reverse movement of the disk carrier disk along the installation direction. Two limit guides provide the horizontal direction of the hard disk carrier disk. Limiting effect, and the limiting rivet head and plate provide the vertical limiting effect of the hard disk bearing disk.

Although the present invention is disclosed in the foregoing preferred embodiments as above, it is not intended to limit the present invention. Any person skilled in similar arts can make some changes and retouch without departing from the spirit and scope of the present invention. The scope of patent protection of an invention shall be determined by the scope of patent application attached to this specification.

10‧‧‧Hard Disk Carrier Disk>

20‧‧‧ Hard Drive

30‧‧‧chassis

31‧‧‧Board

32‧‧‧ limit guide

33‧‧‧ bump

34‧‧‧ Positioning hole

35‧‧‧Rivets

36‧‧‧Guide bevel

37‧‧‧ Stop surface

38‧‧‧Limited rivet head

100‧‧‧carrying plate

110‧‧‧First plate

111‧‧‧ underside

120‧‧‧Second plate

121‧‧‧ perforation

122‧‧‧ the first side

130‧‧‧ Third plate

131‧‧‧ perforation

132‧‧‧ second side

140‧‧‧Fourth plate

141‧‧‧display surface

142‧‧‧Abut

150‧‧‧The first guide piece

151‧‧‧The third limit slot

160‧‧‧Second guide piece

161‧‧‧Fourth limit slot

170‧‧‧ the first limit slot

180‧‧‧ second limit slot

200‧‧‧Fixed components

210‧‧‧Fixture

211‧‧‧Assembly Department

212‧‧‧Guide

2121‧‧‧Groove

220‧‧‧operating parts

221‧‧‧ Board

2211‧‧‧operation section

2211a‧‧‧Slip prevention structure

2212‧‧‧Body Section

2213‧‧‧Guide

2213a‧‧‧Kagu

2213b‧‧‧Tapered segment

2214‧‧‧Inner wall surface

222‧‧‧First side

2221‧‧‧First bending structure

223‧‧‧second side

2231‧‧‧Second bending structure

224‧‧‧Chute

230‧‧‧Card Firmware

231‧‧‧Head

2311‧‧‧Guide slope

232‧‧‧body

2321‧‧‧ edge

D‧‧‧ direction

W1, W2, W3, W4‧‧‧Width

H‧‧‧ height

FIG. 1 is an exploded schematic view of a hard disk carrying disk carrying a hard disk separated from a casing according to a first embodiment of the present invention.
FIG. 2 is an exploded view of the hard disk of FIG. 1 separated from the hard disk carrier. FIG.
FIG. 3 is a schematic perspective view of an operating member of the fastening component of FIG. 2.
FIG. 4 is a schematic front view of the hard disk carrier disk of FIG. 2.
FIG. 5 is a schematic front view of the hard disk carrying disk of FIG. 2 being installed in the casing.
FIG. 6 is a schematic cross-sectional view of the hard disk carrier tray of FIG. 2 being installed in a casing.
FIG. 7 is a schematic cross-sectional view of the card fastener of FIG. 6 being lifted by being guided by the bumps of the casing.
FIG. 8 is a schematic cross-sectional view illustrating that the card firmware of FIG. 7 is fixed to the casing.
FIG. 9 is a schematic cross-sectional view of the hard disk carrying disk of FIG. 2 installed in a casing.
FIG. 10 is a schematic cross-sectional view of the card fastener of FIG. 8 separated from the casing.

Claims (10)

A hard disk carrying disk is used for carrying a hard disk and installing a casing. The hard disk carrying disk includes:
A carrying plate is used for carrying the hard disk. The carrying plate has a first side and a second side opposite to each other. The first side and the second side are arranged parallel to the hard disk carrying plate. The installation direction of the casing; and a clamping component, which is disposed on the bearing plate and maintains a distance from the first side and the second side, respectively, the clamping component includes: a fixing member, fixed on The carrier plate; an operating member slidably disposed on the fixing member, the operating member has a guide groove, the guide groove includes a clamping section and a tapered section connected, and the width of the tapered section is A side connecting one of the fixing sections gradually decreases away from the fixing section; and a fixing device, which includes a head and a body connected to each other, the width of the head is greater than the width of the body, and the head has a Guide slope, the body slidably passes through the guide slot and the fixing member; wherein the operating member can slide between a locking position and a releasing position, and when the operating member is located in the locking position, The head is located in the clamping section, and the body is used for clamping to the casing. When the clamping position is moved to the release position, the tapered section is moved toward the head, so that the operating member abuts against the guide inclined surface of the head, and the head is released from the guide groove, so that the body The part is separated from the case. According to the hard disk carrier disk described in the first item of the patent application scope, wherein the operating member further has an inner side wall surface, the inner side wall surface forms the guide groove, and the normal direction of the inner side wall surface is away from the carrier plate, When the operating member is located at the fixing position, the guide inclined surface of the head abuts a portion of the inner wall surface surrounding the fixing section, and when the operating member is moved from the fixing position to the release position, the inner wall surface A portion surrounding the tapered section abuts the guide slope. The hard disk carrier according to item 1 of the patent application scope, wherein the operating member includes a plate portion, a first side portion, and a second side portion, and the first side portion and the second side portion are connected to The two opposite sides of the plate portion extend in the same direction. The guide groove is located on the plate portion. The plate portion, the first side portion, and the second side portion together form a sliding groove. The fixing member includes a connected one. An assembly portion and a guide portion are assembled on the bearing plate, and the guide portion is located in the slide groove. The hard disk carrier according to item 3 of the scope of patent application, wherein the first side portion has a first bending structure, and the second side portion has a second bending structure, and the first bending structure faces The second side portion extends, the second bending structure extends toward the first side portion, the guide portion has two opposite grooves, and the first bending structure and the second bending structure are respectively slidably located at The two grooves. According to the hard disk carrier disk described in the third item of the patent application scope, wherein the plate portion includes an operation section and a body section connected, the width of the operation section is greater than the width of the body section, and the guide groove is located in the body section. The first side portion and the second side portion are connected to two opposite sides of the body section, and the operation section has at least one anti-slip structure. The hard disk carrier according to item 1 of the patent application scope, wherein the carrier board includes a first board, a second board, and a third board, and the second board is separated from the third board. At a distance, the second plate and the third plate are respectively connected to two opposite sides of the first plate and extend in the same direction, and the first side and the second side are respectively located on the second plate and The third plate is distant from each other, and the fixing member is fixed to the first plate. The hard disk carrier according to item 6 of the application, wherein the second plate and the third plate each have a plurality of perforations, and the perforations are respectively used to align with a plurality of keyholes of the hard disk. The hard disk carrier according to item 6 of the patent application scope, wherein the carrier board further includes a first guide member and a second guide member, and the first guide member is connected to the second plate member and the second guide member. The first rail member and the second rail member are connected to the third plate member, and the first rail member and the second rail member are located between the second plate member and the third plate member. The first rail member and the second plate member together form a first A limiting slot, the second guide member and the third plate member together form a second limiting slot, and the first limiting slot and the second limiting slot are respectively used to accommodate two limiting guides of the casing . The hard disk carrier according to item 8 of the scope of patent application, wherein the first guide member has a third limit slot, the second guide member has a fourth limit slot, the third limit slot and the A fourth limit slot is located between the first limit slot and the second limit slot, and the third limit slot and the fourth limit slot are respectively used to receive two limit rivet heads of the casing. The hard disk carrier disk as described in the sixth item of the patent application scope, wherein the carrier board includes a fourth board member, the fourth board member is connected to the first board member and is located on the second board member and the third board member. Between the components, the fourth plate has a display surface, and the display surface faces the fixing component.