TW202121957A - Mount structure for expansion card and circuit assembly - Google Patents

Abstract

A mount structure for expansion card configured to mount expansion card to socket of circuit board and including first slide rail, second slide rail, latch and stop component. Latch includes elastic arm and protrusion. Elastic arm includes opposite fixed end part and movable end part. Fixed end part is fixed to side cover plate of first slide rail. Protrusion protrudes from movable end part and is located in groove of first slide rail. Stop component is slidably disposed on side cover plate of first slide rail. When stop component is located in stop position and expansion card is inserted into socket, stop component located on side of movable end part located away from bottom plate of first slide rail so as to prevent protrusion from being moved away from hole of expansion card. When stop component is located in released position and expansion card is inserted into socket, stop component is located away from the movable end part so that protrusion can be moved away from hole of expansion card.

Description

Expansion card installation structure and circuit assembly

The present invention relates to an expansion card installation structure and circuit assembly, in particular to an expansion card installation structure and circuit assembly including sliding rails.

The Open Compute Project (OCP) is an organization that shares data center product designs between companies. Servers or expansion cards related to open computing projects have been widely used in various levels. Generally speaking, expansion cards related to open computing projects are inserted into slots on the circuit board through guide rails on the circuit board.

However, when the expansion card is inserted into the slot of the circuit board, it is only supported by the slot and the sliding rail, so that the expansion card may shake or even fall out of the slot when the server is operating. Therefore, technicians need to find a way to firmly install the expansion card related to the open computing project in the slot of the circuit board through the sliding rail.

The invention provides an expansion card installation structure to improve the stability of installing the expansion card in the slot of the circuit board.

The expansion card installation structure disclosed in an embodiment of the present invention is used for installing an expansion card in a slot of a circuit board. The expansion card installation structure includes a first sliding rail, a second sliding rail, a first buckle elastic piece, and a first limiting member. The first slide rail and the second slide rail are used for fixing on the circuit board. The first slide rail and the second slide rail each include a bearing plate, a side cover plate and a slide groove. The two side cover plates are respectively connected to the two supporting plates and respectively surround the two sliding grooves with the two supporting plates. The two sliding slots are used for sliding the expansion card to install the expansion card in the slot of the circuit board. The first buckle elastic piece includes a first elastic arm and a first protrusion. The first elastic arm includes a first fixed end and a first movable end opposite to each other. The first fixed end is fixed to the side cover plate of the first slide rail. The first protrusion protrudes from the first movable end and is located in the sliding groove of the first sliding rail, so that the first protrusion is used for engaging with a slot of the expansion card. The first limiting member includes a sliding block and an operating bump. The sliding block is slidably arranged on the side cover of the first sliding rail and is located at a stop position or a release position. The operating bump protrudes from one side of the slider. When the first limiting member is located at the stopping position and the expansion card is inserted into the slot of the circuit board, the first limiting member is stopped on the side of the first movable end away from the carrier plate of the first slide rail to prevent the first A bump is detached from the slot of the expansion card. When the first limiting member is in the release position and the expansion card is inserted into the slot of the circuit board, the first movable end part is separated from the stop of the first limiting member, so that the first protrusion can escape from the slot of the expansion card.

The circuit assembly disclosed in another embodiment of the present invention includes a circuit board, an expansion card, a first slide rail, a second slide rail, a buckle elastic piece, and a stopper. The circuit board includes a board body and a slot arranged on the board body. The expansion card is inserted in the slot of the circuit board. The first sliding rail and the second sliding rail are fixed on the circuit board, and each includes a carrying plate, a side cover plate and a sliding groove. The two side cover plates are respectively connected to the two supporting plates and respectively surround the two sliding grooves with the two supporting plates. The two sliding slots are used for sliding the expansion card to install the expansion card in the slot of the circuit board. The buckle shrapnel includes an elastic arm and a bump. The elastic arm includes a fixed end and a movable end opposite to each other. The fixed end is fixed to the side cover plate of the first slide rail. The protrusion protrudes from the movable end and is located in the sliding groove of the first sliding rail, so that the protrusion is used for engaging with a slot of the expansion card. The limiter includes a sliding block and an operating bump. The sliding block is slidably arranged on the side cover of the first sliding rail and is located at a stop position or a release position. The operating bump protrudes from one side of the slider. When the limiting member is located at the stopping position and the expansion card is inserted into the slot of the circuit board, the limiting member is stopped at the side of the carrier plate whose movable end is away from the first slide rail to prevent the protrusion from being separated from the card of the expansion card groove. When the limiting member is located at the release position and the expansion card is inserted into the slot of the circuit board, the movable end part is separated from the stop of the limiting member, so that the protrusion can escape from the card slot of the expansion card.

According to the expansion card installation structure disclosed in the above embodiment, because the fixed end of the elastic arm is fixed to the side cover, the protrusion protrudes from the movable end of the elastic arm and is located in the sliding groove, and the limiting member is slidably arranged on the side Cover plate, so when the limiter is at the stop position and the expansion card is inserted into the slot of the circuit board, the limiter will stop at the movable end of the side far away from the carrier board to prevent the bumps from detaching from the second side of the expansion card. Card slot. In this way, the expansion card can be stably installed in the slot of the circuit board through the first slide rail and the second slide rail.

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 to provide a further explanation of the scope of the patent application of the present invention.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient to enable anyone familiar with the relevant art to understand the technical content of the present invention and implement it accordingly, and is based on the content disclosed in this specification, the scope of patent application and the drawings. Anyone who is familiar with relevant skills can easily understand the purpose and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention by any viewpoint.

Please refer to Figure 1 to Figure 4. Fig. 1 is an exploded view of a circuit assembly according to a first embodiment of the present invention. FIG. 2 is a perspective view of the first sliding rail, the buckle elastic piece and the limiting member in FIG. 1. Fig. 3 is an exploded view of the first sliding rail, the buckle elastic piece and the limiting member in Fig. 2. FIG. 4 is an exploded view of the first sliding rail, the buckle elastic piece and the limiting member in FIG. 2 from another perspective.

In this embodiment, the circuit assembly 10 includes an expansion card 100, a circuit board 200, and an expansion card fixing structure 250. The circuit board 200 includes a board body 201 and a slot 202. The board body 201 of the circuit board 200 includes a top surface 203, a bottom surface 204, a slot 205, a first wall surface 206 and a second wall surface 207. The top surface 203 and the bottom surface 204 face away from each other. The slot 205 penetrates the top surface 203 and the bottom surface 204. The first wall surface 206 and the second wall surface 207 are located in the slot 205 and face each other. The slot 202 is disposed on the board 201 and located in the slot 205. The expansion card 100 is accommodated in the slot 205.

In this embodiment, the expansion card fixing structure 250 includes a first sliding rail 300, a second sliding rail 400, a buckle elastic piece 500 and a limiting member 600.

The first sliding rail 300 and the second sliding rail 400 are respectively fixed to the first wall surface 206 and the second wall surface 207 of the circuit board 200 and used for the expansion card 100 to slide.

Of course, the circuit board 200 is not limited to including the slot 205, and in other embodiments, the circuit board does not include the slot. Furthermore, in the embodiment where the circuit board does not include a slot, the slot, the first sliding rail, and the second sliding rail are instead arranged on the top surface of the circuit board.

Since the first slide rail 300 and the second slide rail 400 are similar in structure, for the convenience of description, only the detailed structure of the first slide rail 300 is exemplified below.

The first sliding rail 300 includes a supporting plate 301, a side cover 302 and a sliding groove 303. The side cover plate 302 is connected to the supporting plate 301 and surrounds the sliding groove 303 together with the supporting plate 301. The side cover 302 includes a first plate 3020, a second plate 3021, and a third plate 3022. The first board 3020 is connected to the third board 3022 through the second board 3021. The second board 3021 is located between the first board 3020 and the third board 3022, and the third board 3022 is closer to the slot 202 than the first board 3020. The sliding slot 303 is used for sliding the expansion card 100 to install the expansion card 100 in the slot 202 of the circuit board 200.

The snap elastic piece 500 includes an elastic arm 501 and a protrusion 502. The elastic arm 501 includes a fixed end 5010 and a movable end 5011 opposite to each other. The fixed end 5010 is fixed to the third plate body 3022 of the side cover 302. In addition, as shown in FIG. 2, in this embodiment, the extending direction D1 of the sliding groove 303 of the first sliding rail 300 is substantially parallel to the extending direction D2 of the elastic arm 501. In other words, the extension direction D1 and the extension direction D2 are parallel to each other or have a negligible angle, but the present invention is not limited to this. In other embodiments, the extending direction of the sliding groove and the extending direction of the elastic arm form an acute angle.

The protrusion 502 protrudes from the movable end 5011 and is located in the sliding groove 303 of the first sliding rail 300, so that the protrusion 502 is used for engaging with a slot 101 of the expansion card 100. The bump 502 includes a first guiding inclined surface 5020 and a second guiding inclined surface 5021 opposite to each other. The first guiding inclined surface 5020 and the second guiding inclined surface 5021 are used for being pushed by the expansion card 100 to cause the protrusion 502 to escape from the slot 101 of the expansion card 100.

Of course, the bump 502 is not limited to include the first guiding inclined surface 5020 and the second guiding inclined surface 5021. In other embodiments, the bump does not need to include the first guiding slope and the second guiding slope, and the convex block is manually separated from the slot of the expansion card.

In addition, in this embodiment, the snap elastic piece 500 and the first sliding rail 300 are integrally formed, but the invention is not limited to this. In other embodiments, the snap elastic piece and the first slide rail are a combined structure.

The limiting member 600 includes a sliding block 601 and a positioning protrusion 602. The first sliding rail 300 further includes a first positioning hole 304 and a second positioning hole 305. The first positioning hole 304 is located on the side cover 302 of the first sliding rail 300. The second positioning hole 305 is located on the side cover 302 of the first sliding rail 300. The positioning protrusion 602 protrudes from the slider 601, and the slider 601 is slidably disposed on the second plate 3021 of the side cover 302 so that the limiting member 600 is located at a stopping position or a releasing position.

Of course, the limiting member 600 is not limited to including the positioning protrusion 602 and the first sliding rail 300 is not limited to including the first positioning hole 304 and the second positioning hole 305. In other embodiments, the limiting element does not need to include positioning protrusions and the first sliding rail does not need to include a first positioning hole and a second positioning hole, and the limiting element is positioned on the first sliding rail in other suitable ways.

In addition, in this embodiment, the limiting member 600 further includes an operating bump 603. The operating protrusion 603 protrudes from one side of the slider 601, so that the entire limiting member 600 is in an inverted L shape. In addition, the operating protrusion 603 has an arc-shaped side surface 6030, so that the user can operate the limiting member 600 in a more convenient manner.

Of course, the limiting member 600 is not limited to include the operating bump 603. In other embodiments, the limiting member does not need to include an operating bump.

In addition, the fixed end 5010 and the slider 601 of the elastic arm 501 are not limited to be respectively fixed to the third plate 3022 of the side cover 302 closer to the slot 202 and the second plate slidably disposed on the side cover 302. 3021. In other embodiments, the fixed end of the elastic arm is fixed to the second plate body, and the sliding block is slidably disposed on the third plate body closer to the slot.

For the convenience of description, only the first sliding rail 300, the snap elastic piece 500 and the limiting member 600 are used to illustrate the process of disassembling and installing the expansion card 100 in the slot 202 of the circuit board 200 below.

Refer to Figure 5. FIG. 5 is a side view showing that the expansion card is pushed against the first guiding inclined surface of the protrusion and the limiting member is in the released position.

As shown in FIG. 5, when the limiting member 600 is in the released position and the expansion card 100 slides into the sliding groove 303 of the first sliding rail 300 along the insertion direction D3, the expansion card 100 will push against one of the protrusions 502 of the buckle spring 500 The first guiding inclined surface 5020 makes the protrusion 502 protruding from the movable end portion 5011 of the elastic arm 501 away from the carrying plate 301. When the protrusion 502 and the movable end 5011 are far away from the supporting board 301, the expansion card 100 can continue to slide into the sliding slot 303 along the insertion direction D3.

Next, please refer to Figure 6 and Figure 7. FIG. 6 is a perspective view showing that the expansion card is inserted into the slot of the circuit board. FIG. 7 is a side view showing that the protrusion is engaged with the slot of the expansion card and the limiting member is located at the stopping position.

As shown in FIGS. 6 and 7, when the stopper 600 is at the stopping position and the expansion card 100 is inserted into the slot 202 of the circuit board 200, the pushed bump 502 is close to the load due to the elastic force of the elastic arm 501 The board 301 is further engaged with the card slot 101 of the expansion card 100. In addition, the limiting member 600 stops at a side of the movable end portion 5011 away from the supporting plate 301 of the first sliding rail 300 to prevent the protrusion 502 from escaping from the slot 101 of the expansion card 100.

Please refer to FIG. 8. FIG. 8 is a side view showing that the expansion card pushes against the second guiding inclined surface of the protrusion and the limiting member is in the released position.

When the limit member 600 is in the released position and the expansion card 100 is inserted into the slot 202 of the circuit board 200 as shown in FIG. 6, the movable end 5011 of the elastic arm 501 is separated from the stop of the limit member 600, so that the protrusion 502 The card slot 101 of the expansion card 100 can be separated. Next, as shown in FIG. 8, when the stopper 600 is in the release position and the expansion card 100 slides out of the sliding slot 303 of the first sliding rail 300 in the removal direction D4 opposite to the insertion direction D3 in FIG. 5, the expansion card 100 will push against the second guiding inclined surface 5021 of the protrusion 502 of the snap elastic piece 500, so that the protrusion 502 protruding from the movable end 5011 of the elastic arm 501 is away from the carrying plate 301. When the protrusion 502 is far away from the supporting board 301, the expansion card 100 can continue to slide out of the sliding slot 303 along the removal direction D4.

In addition, please refer to Figure 9 and Figure 10. 9 is a side cross-sectional view showing that the positioning protrusion of the limiting member is located at the first positioning hole of the side cover plate. 10 is a side cross-sectional view showing that the positioning protrusion of the limiting member is located at the second positioning hole of the side cover plate. As shown in FIG. 9, when the limiting member 600 is in the release position, the positioning protrusion 602 of the limiting member 600 is located in the first positioning hole 304 of the side cover 302, and the limiting member 600 is positioned in the released position. As shown in FIG. 10, when the limiting member 600 is at the stopping position, the positioning protrusion 602 is located at the second positioning hole 305 of the side cover 302, and the limiting member 600 is positioned at the stopping position.

The number of buckle elastic pieces 500 and limit members 600 is not limited to a single one. Please refer to FIG. 11, which is an exploded view of the circuit assembly according to the second embodiment of the present invention.

In this embodiment, the expansion card fixing structure 250a of the circuit assembly 10a includes a first sliding rail 300a, a second sliding rail 400a, a first snap elastic piece 500a, a first limiting member 600a, and a second card Buckle elastic piece 700a and a second limiting member 800a. That is to say, in this embodiment, the expansion card fixing structure 250a includes two buckle elastic pieces and two limiting members. The first buckle elastic piece 500a and the second buckle elastic piece 700a are respectively disposed on the first slide rail 300a and the second slide rail 400a, and are respectively used for engaging with the two grooves 101a and 102a of the expansion card 100a. The first limiting member 600a and the second limiting member 800a are respectively disposed on the first slide rail 300a and the second slide rail 400a, and are used to stop the first snap elastic piece 500a and the second snap elastic piece 700a, respectively.

For the detailed structure of the first buckle elastic piece 500a and the second buckle elastic piece 700a, please refer to the above description of the buckle elastic piece 500 based on FIGS. 1 to 4, and will not be repeated here. For the detailed structure of the first limiting member 600a and the second limiting member 800a, please refer to the above description of the limiting member 600 based on FIGS. 1 to 4, and will not be repeated here.

The operation process of the expansion card 100a being detached from the slot 202a of the circuit board 200a through the expansion card fixing structure 250a, please refer to the above description based on FIGS. 5 to 8, and will not be repeated here.

According to the expansion card installation structure disclosed in the above embodiment, because the fixed end of the elastic arm is fixed to the side cover, the protrusion protrudes from the movable end of the elastic arm and is located in the sliding groove, and the limiting member is slidably arranged on the side Cover plate, so when the limiter is at the stop position and the expansion card is inserted into the slot of the circuit board, the limiter will stop at the movable end of the side far away from the carrier board to prevent the bumps from detaching from the second side of the expansion card. Card slot. In this way, the expansion card can be stably installed in the slot of the circuit board through the first slide rail and the second slide rail.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of patent protection for inventions shall be determined by the scope of patent applications attached to this specification.

10.10a: Circuit components 100, 100a: Expansion card 101, 101a, 102a: card slot 200, 200a: circuit board 201: Board body 202, 202a: Slot 203: top surface 204: Bottom 205: Slotting 206: The first wall 207: The second wall 250, 250a: Expansion card fixed structure 300, 300a: the first slide 301: Carrier Board 302: side cover 3020: The first board 3021: second board body 3022: The third board 303: Chute 304: The first positioning hole 305: second positioning hole 400, 400a: second slide 500: buckle shrapnel 500a: The first snap shrapnel 501: Spring Arm 5010: fixed end 5011: movable end 502: bump 5020: The first guide slope 5021: The second guide slope 600: limit piece 600a: The first limit piece 601: Slider 602: positioning bump 603: Operation bump 6030: curved side 700a: second snap shrapnel 800a: second limit piece D1, D2: extension direction D3: Insertion direction D4: removal direction

Fig. 1 is an exploded view of a circuit assembly according to a first embodiment of the present invention. FIG. 2 is a perspective view of the first sliding rail, the buckle elastic piece and the limiting member in FIG. 1. Fig. 3 is an exploded view of the first sliding rail, the buckle elastic piece and the limiting member in Fig. 2. FIG. 4 is an exploded view of the first sliding rail, the buckle elastic piece and the limiting member in FIG. 2 from another perspective. FIG. 5 is a side view showing that the expansion card is pushed against the first guiding inclined surface of the protrusion and the limiting member is in the released position. FIG. 6 is a perspective view showing that the expansion card is inserted into the slot of the circuit board. FIG. 7 is a side view showing that the protrusion is engaged with the slot of the expansion card and the limiting member is located at the stopping position. FIG. 8 is a side view showing that the expansion card is pushed against the second guiding inclined surface of the protrusion and the limiting member is in the released position. 9 is a side cross-sectional view showing that the positioning protrusion of the limiting member is located at the first positioning hole of the side cover plate. 10 is a side cross-sectional view showing that the positioning protrusion of the limiting member is located at the second positioning hole of the side cover plate. Fig. 11 is an exploded view of a circuit assembly according to a second embodiment of the present invention.

10: Circuit components

100: Expansion card

101: card slot

200: circuit board

201: Board body

202: Slot

203: top surface

204: Bottom

205: Slotting

206: The first wall

207: The second wall

250: Expansion card fixed structure

300: The first slide

400: second slide

500: buckle shrapnel

600: limit piece

Claims (10)

An expansion card installation structure for installing an expansion card in a slot of a circuit board. The expansion card installation structure includes: A first slide rail and a second slide rail are used to be fixed to the circuit board. The first slide rail and the second slide rail each include a carrying plate, a side cover and a slide groove. The two side covers The boards are respectively connected to the two supporting boards to respectively surround the two sliding grooves with the two supporting boards, and the two sliding grooves are used for sliding the expansion card to install the expansion card in the slot of the circuit board; The first buckle elastic piece includes a first elastic arm and a first protrusion. The first elastic arm includes a first fixed end and a first movable end opposite to each other. The first fixed end is fixed to the On the side cover of the first slide rail, the first protrusion protrudes from the first movable end and is located in the slide groove of the first slide rail, so that the first protrusion is used for engaging with the expansion A card slot of the card; and a first limiting member, including a sliding block and an operating protrusion, the sliding block is slidably arranged on the side cover of the first slide rail and is located at a stopping position or a release Position, the operating bump protrudes from one side of the slider; wherein, when the first limiting member is located at the stopping position and the expansion card is inserted into the slot of the circuit board, the first limiting element The positioning member is stopped at a side of the supporting plate of the first movable end away from the first slide rail to prevent the first protrusion from escaping from the slot of the expansion card. When the first limiting member is located in the release Position and when the expansion card is inserted into the slot of the circuit board, the first movable end part breaks away from the stop of the first limiting member so that the first protrusion can escape from the slot of the expansion card. According to the expansion card installation structure described in claim 1, wherein the extending direction of the sliding groove of the first sliding rail is substantially parallel to the extending direction of the first elastic arm. According to the expansion card installation structure described in item 1 of the scope of patent application, the first limiting member includes a sliding block and a positioning protrusion, and the first sliding rail further includes a first positioning hole and a second positioning hole , The first positioning hole is located on the side cover plate of the first slide rail, the second positioning hole is located on the side cover plate of the first slide rail, the positioning protrusion protrudes from the slider, and the slider The side cover plate is slidably disposed on the first slide rail. When the first limiting member is located at the release position, the positioning protrusion is fixed to the first positioning hole, and when the first limiting member is located at the stop In the blocking position, the positioning convex point is fixed to the second positioning hole. According to the expansion card installation structure described in claim 1, wherein the first protrusion includes a first guiding slope and a second guiding slope opposite to each other, the first guiding slope and the second guiding slope The guiding inclined surface is used for being pushed by the expansion card to make the first protrusion escape from the card slot of the expansion card. In the expansion card installation structure described in item 1 of the scope of patent application, the first snap elastic piece and the first slide rail are integrally formed. According to the expansion card installation structure described in claim 1, wherein the side cover of the first slide rail includes a first board, a second board, and a third board, the first board The second plate is connected to the third plate through the second plate. The second plate is interposed between the first plate and the third plate. The first fixed end is fixed to the third plate. The first limiting member is slidably disposed on the second board. For example, the expansion card installation structure described in item 1 of the scope of patent application further includes a second buckle elastic piece and a second limiting member. The second buckle elastic piece includes a second elastic arm and a second protrusion, The second elastic arm includes a second fixed end portion and a second movable end portion opposite to each other. The second fixed end portion is fixed to the side cover plate of the second slide rail, and the second protrusion protrudes from the side cover plate. The second movable end is located in the sliding groove of the second sliding rail, so that the second protrusion is used for engaging with another slot of the expansion card, and the second limiting member is slidably disposed on the first The side cover of the two slide rails is located at a stopping position or a releasing position. When the second limiting member is at the stopping position and the expansion card is inserted into the slot of the circuit board, the second The limiting member stops at a side of the supporting plate of the second movable end away from the second slide rail to prevent the second protrusion from escaping from the other slot of the expansion card. When the second limiting member When the expansion card is in the release position and is inserted into the slot of the circuit board, the second movable end part breaks away from the stop of the second limiting member, so that the second protrusion can be separated from the other of the expansion card One the card slot. A circuit component includes: A circuit board including a board body and a slot arranged on the board body; an expansion card inserted in the slot of the circuit board; a first sliding rail and a second sliding rail fixed to the circuit The first slide rail and the second slide rail each include a bearing plate, a side cover plate and a chute. The two side cover plates are respectively connected to the two bearing plates and respectively surround the two bearing plates. The two sliding grooves are used for sliding the expansion card to install the expansion card in the slot of the circuit board; a snap-fit elastic piece includes an elastic arm and a protrusion, and the elastic arm includes opposite A fixed end portion and a movable end portion of the fixed end portion, the fixed end portion is fixed to the side cover plate of the first slide rail, the protrusion protrudes from the movable end portion and is located in the slide groove of the first slide rail, Furthermore, the protrusion is used for engaging with a slot of the expansion card; and a limiting member includes a slider and an operating protrusion, and the slider is slidably disposed on the side cover of the first slide rail Board is located at a stopping position or a release position, and the operating bump protrudes from one side of the slider; wherein, when the limiting member is at the stopping position and the expansion card is inserted in the circuit board When inserting a slot, the limiting member stops at a side of the bearing plate that is away from the first slide rail at the movable end to prevent the protrusion from escaping from the slot of the expansion card. When the limiting member is located in the release Position and when the expansion card is inserted into the slot of the circuit board, the movable end part breaks away from the stop of the limiting member so that the protrusion can escape from the slot of the expansion card. The circuit assembly described in item 8 of the scope of patent application, wherein the board body of the circuit board includes a top surface, a bottom surface, a slot, a first wall surface and a second wall surface, and the top surface and the bottom surface are mutually Opposite, the slot penetrates the top surface and the bottom surface, the first wall surface and the second wall surface are located in the slot and face each other, the first slide rail and the second slide rail are respectively fixed to the first wall surface And the second wall surface, the slot is located in the slot, and the expansion card is accommodated in the slot. The circuit assembly described in item 8 of the scope of patent application, wherein the extending direction of the sliding groove of the first sliding rail is substantially parallel to the extending direction of the elastic arm.

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