KR20110055994A - Printed circuit board module and display device comprising the same - Google Patents

Abstract

PURPOSE: A printed circuit board module and display device including the same are provided to reduce electronic wave, block electronic wave of a printed circuit board, conveniently assembly and disassembly each configuration member, reduce a manufacturing cost, and have excellent repair characteristic. CONSTITUTION: A display device includes a display module, a printed circuit board(110), a shield, a cooling member(160). The printed circuit board has a signal receiving unit and a signal processing unit and transmits a processed signal to the display module. The shield covers a front surface and a rear surface of the printed circuit board and some part of the shield is grounded to the printed circuit board. The cooling member is mounted to the shield for cooling the printed circuit board.

Description

Printed circuit board module and display device comprising the same

The present invention relates to a printed circuit board module capable of reducing electromagnetic waves and a display device including the same.

The present invention can effectively shield the electromagnetic waves of the printed circuit board, can easily cool and dissipate heat generated from each element of the printed circuit board, easy to assemble and disassemble each component member, and lower the manufacturing cost The present invention relates to a printed circuit board module having excellent repair characteristics and a display device including the same.

The display device refers to a device that displays an image signal input from the outside. Such a display device is a concept including a monitor for displaying an image received from a computer and a television for displaying an image and a sound transmitted from a broadcasting station, and all devices for displaying an image input from the outside.

Recently, high-quality large display devices equipped with flat panel display modules such as liquid crystal display panels (LCDs) or plasma display panels (PDPs) have been in the spotlight.

Such a display device includes a display module for realizing an image, a printed circuit board (PCB) for controlling an image of the display module, controlling sound and communication, a front cover surrounding a front edge of the display module, and a rear of the display module. It includes a rear cover to cover.

In addition, the printed circuit board may be connected to an external device, and is provided with a plurality of external terminals that perform input / output functions of video, audio, and communication.

On the other hand, the display device may be connected to the external device by wireless or wired, the printed circuit board is mounted with a plurality of elements such as a signal processing element, a reservoir and a microcomputer for control, for transmitting and receiving signals between the elements A pattern acting as a passage is formed.

In particular, the printed circuit board may be affected by electromagnetic noise generated by its own noise and other components, resulting in malfunction of the display device. That is, electromagnetic waves, that is, electromagnetic interference (EMI) noise, are generated when an external terminal is connected to a wired device through an external terminal provided on a printed circuit board or when the external terminal contacts the printed circuit board. This may cause noise on the display screen or cause malfunction.

Accordingly, there is a need for a display apparatus that effectively shields electromagnetic waves, eliminates overheating of a printed circuit board, and has a grounding structure having excellent repair characteristics.

The present invention has been made to solve the above problems, an object of the present invention is to provide a printed circuit board module and a display device including the same that can shield the electromagnetic waves of the printed circuit board.

In addition, another object of the present invention is to provide a printed circuit board module and a display device including the same that can effectively cool the heat generated from each element of the printed circuit board.

In addition, another object of the present invention is to provide a printed circuit board module and a display device including the same, which is easy to assemble and disassemble each component, lower manufacturing costs, and excellent repair characteristics.

The present invention is to achieve the above object,

According to an aspect of the invention, the display module; A printed circuit board having a signal receiving unit and a signal processing unit and transferring the processed signal to a display module; A display module for outputting a signal processed by the signal processor; A shield covering a front surface and a rear surface of the printed circuit board, wherein a partial area is grounded to the printed circuit board; And a cooling member mounted to the shield for cooling the printed circuit board.

The shield may further include: an upper shield member surrounding an upper surface of the printed circuit board and provided with a mounting portion for a cooling member; An intermediate shield member mounted to the upper shield member through a first binding means and grounded to the printed circuit board; And a lower shield member mounted to the intermediate shield member through a second binding means and surrounding the lower surface of the printed circuit board.

In this case, the first binding means includes: a first through hole penetrating the upper and lower surfaces of the printed circuit board; A second through hole formed in the upper shield member to correspond to the position of the first through hole; And a leg extending from the intermediate shield member and sequentially passing through the first through hole and the second through hole, and having one end portion coupled to the upper shield member.

In addition, a boundary portion between the first through hole of the printed circuit board and the leg of the intermediate shield member may be soldered to each other.

In addition, the end portion of the leg of the intermediate shield member passing through the second through hole of the upper shield member may be bent to contact the upper surface of the upper shield member.

In addition, the lower shield member may be mounted to the intermediate shield member while surrounding the outer circumferential surface of the intermediate shield member.

In addition, the second binding means, the binding projection formed on the intermediate shield member; And a binding groove or a binding hole formed at a position corresponding to the binding protrusion of the lower shield member.

In addition, a plurality of heat dissipation holes may be provided in the lower shield member.

In addition, the cooling member may be a cooling fan.

In addition, the display device according to an aspect of the present invention may further include a heat dissipation member mounted on the lower surface of the printed circuit board.

In addition, the upper shield member may be provided with a heat radiation pad in contact with the device mounted on the printed circuit board.

According to another aspect of the invention, a printed circuit board mounted with one or more elements; A shield covering a front surface and a rear surface of the printed circuit board, wherein a partial area is grounded to the printed circuit board; And a cooling member mounted to the shield for cooling the printed circuit board.

The shield may further include: an upper shield member surrounding a front surface of the printed circuit board and provided with a mounting portion for a cooling member; An intermediate shield member mounted to the upper shield member through a first binding means and grounded to the printed circuit board; And a lower shield member mounted to the intermediate shield member through a second binding means and surrounding a rear surface of the printed circuit board.

In addition, the first binding means, the first through hole penetrating the front and rear of the printed circuit board; A second through hole formed in the upper shield member to correspond to the position of the first through hole; And a leg extending from the intermediate shield member and sequentially passing through the first through hole and the second through hole, and having one end portion coupled to the upper shield member.

In addition, a boundary portion between the first through hole of the printed circuit board and the leg of the intermediate shield member may be soldered to each other.

In addition, the end portion of the leg of the intermediate shield member passing through the second through hole of the upper shield member may be bent to contact the upper surface of the upper shield member.

In addition, the second binding means, the binding projection formed on the intermediate shield member; And a binding groove or a binding hole formed at a position corresponding to the binding protrusion of the lower shield member.

In addition, a plurality of heat dissipation holes may be provided in the lower shield member.

In addition, the cooling member may be a cooling fan.

As described above, the printed circuit board module and the display device including the same according to the present invention can effectively shield the electromagnetic waves of the printed circuit board, and easily cool and dissipate heat generated from each element of the printed circuit board. You can.

In addition, the printed circuit board module and the display device including the same can be easily assembled and disassembled of each component, can reduce manufacturing cost, and have excellent repair characteristics.

Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show exemplary forms of the present invention, which are provided to explain the present invention in more detail, and the technical scope of the present invention is not limited thereto.

In addition, irrespective of the reference numerals, the same or corresponding components will be given the same reference numerals, and redundant description thereof will be omitted. For convenience of description, the size and shape of each component shown may be exaggerated or reduced. have.

On the other hand, terms including ordinal numbers such as first or second may be used to describe various components, but the components are not limited by the terms, and the terms are defined by one component from another component. It is used only for the purpose of distinguishing.

1 is a perspective view illustrating a display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view illustrating main parts of the display device according to an embodiment of the present invention.

The display device 1 according to the exemplary embodiment of the present invention includes a front cover 10 and a rear cover 50 coupled to the front cover to form a predetermined space.

In addition, the display module 30 that is disposed behind the front cover 10 and implements an image and disposed behind the display module 30, and controls the image, sound and communication of the display module 30 Printed circuit board module (PCB module) 100 is included.

In addition, the printed circuit board may be connected to an external device by wire or wirelessly, and a signal receiving unit and a signal processing unit may be mounted to perform an input / output function of an image, sound, and communication.

The signal receiver may include a set top box (not shown) or a cable terminal (not shown) exposed to the outside of the display apparatus 1 or the wireless signal receiver for wireless communication with an external device.

The cable terminal may be connected to an external device such as an antenna, a digital camera, a computer, a game machine, or a camcorder, and may include both an analog terminal and a digital terminal.

In this way, the cable terminals provided on the printed circuit board may have a direction substantially parallel to the rear terminal array and the rear cover exposed to the outside along a direction substantially perpendicular to the rear cover 50 in consideration of user convenience and design factors. Therefore, it may include one or more of the side terminal array exposed to the outside.

The rear terminal array and the side terminal array may include one or more cable terminals, which may include antenna terminals, RGB terminals, composite (AV) terminals, component terminals, digital visual interface (DVI) terminals, or high definition multimedia. Interface) terminal.

That is, the rear terminal array and the side terminal array are formed of an arrangement of such cable terminals, and the type, number and arrangement of terminals may be variously configured.

1 and 2, the front cover 10 includes a display area 11 for displaying an image to the outside and a non-display area 12 that is formed to be translucent or opaque so that the image is not displayed to the outside. It may include.

Here, the display area 11 and the non-display area 12 of the front cover 10 may be divided in various ways. In one embodiment, the display area 11 may be formed of a plate formed of transparent resin or glass. The non-display area 12 may be formed by printing a translucent or opaque ink or film on one edge portion of the plate.

In addition, the front cover 10 may perform a function of correcting optical characteristics of the display image displayed from the display module 30 or shielding electromagnetic waves or near infrared rays, and for this purpose, the front cover 10 includes a plurality of functional layers. This can be stacked.

In addition, the space (not shown) between the front cover 10 and the rear cover 50, as well as the above-described display module 30 and the printed circuit board module 100, other speaker modules (not shown) And the like can be arranged together.

The display module 30 may include a cathode ray tube (CRT), an electroluminescent device (EL), a light emitting diode (LED), a vacuum fluorescence display (VFD), and an electric field. Emissive or light-receiving modules, such as a field emission display (FED), a plasma display panel (PDP), a liquid crystal display (LCD), and the like, may be included. The display device 1 may be embodied in various kinds of video display devices such as a television or a monitor.

Meanwhile, referring to FIG. 1, the display apparatus 1 may further include a stand 200 that supports and distributes the load of the display main body, and the stand 200 may include a base part mounted on an installation surface ( 220 and a neck unit 210 connecting the base unit and the display main body, and the stand 200 may be configured to implement a tilting or swivel operation to provide an optimal viewing angle to the user. .

1 illustrates a case in which a load is supported by the stand body 200, but the present invention is not limited thereto. The display body may be fixed and supported on a wall by a wall-mounted type.

Hereinafter, a method of assembling each component and the mounting members 20 and 40 constituting the display apparatus 1 will be described in detail.

The display device 1 includes mounting members 20 and 40 having one end coupled to a rear surface of the non-display area 12 of the front cover 10 and the other end supporting one end of the display module 30. It may further include, in this case, the rear cover 50 may be fastened to the mounting member (20, 40).

Referring to FIG. 2, the mounting member is adhered to the rear surface of the non-display area 12 of the front cover 10, and the one or more brackets 20 and the boss holes 21 in which a plurality of boss holes 21 are formed. The fastening hole 41 is formed at a position corresponding to the fastening hole 41 and is fastened to the bracket 20, and may include a supporter 40 supporting one end of the display module 30.

In addition, a fastening hole 51 is formed at a position corresponding to the boss hole 21 of the bracket 20 in the rear cover 50, and a screw S passes through the fastening hole 51 to allow the boss. By being fastened to the hole 21, the rear cover 50 is fixed to the bracket 20.

The bracket 20 may have a bar-type structure extending in the longitudinal direction, and the plurality of brackets 20 may have a predetermined interval on the rear surface of the non-display area 12 of the front cover 10. It may be attached or adhered to each other in a spaced state.

As shown in FIG. 2, each component constituting the display device 1 may be assembled through the bracket 20, and the bracket 20 may be prevented from being exposed to the outside. Is adhered or adhered to the rear surface of the non-display area 12 of the front cover 10.

In addition, the support 40 has a fastening hole 41, a support for supporting the fastening portion seated in the opening of the boss hole 21 and one end of the display module 30 and the fastening portion and the support portion It may include a connecting portion for connecting, it may be formed to have a variety of structures capable of performing such a function.

In addition, an adhesive layer (not shown) may be formed between the supporter 40 and one end of the display module 30 so as to be adhered or bonded to each other, and a cushion member (not shown) may be inserted.

On the other hand, as shown in Figure 2, the supporter 40 and the rear cover 50 may be fastened together in the same boss hole 21 of the bracket 20, thereby simplifying the assembly process and assembly time and You can save money.

So far, the front cover 10 and the rear cover 50 have been described as being coupled through separate mounting members, but the present invention is not limited thereto, and the rear cover 50 may be directly coupled to the front cover 10. Of course.

3 is a perspective view illustrating a printed circuit board module 100 according to the present invention.

Referring to FIG. 3, a printed circuit board module 100 according to an exemplary embodiment of the present invention may include a printed circuit board 110 having a signal receiving unit and a signal processing unit and shielding electromagnetic waves of the printed circuit board. A shield 120 covering a front surface and a rear surface of a portion, and a portion of which is grounded to the printed circuit board 110, and a cooling member 160 mounted to the shield 120 for cooling the printed circuit board.

FIG. 4 is a perspective view of each component of FIG. 3 in a separated state, and FIG. 5 is a bottom perspective view of the upper shield member of FIG. 4.

Referring to FIG. 4, the shield 120 may include an upper shield member 130, an intermediate shield member 140, and a lower shield member 150.

Here, the upper shield member 130 may surround the upper surface 111 of the printed circuit board 110, and a mounting unit 134 for mounting the cooling member 160 may be provided.

In one embodiment, the upper shield member 130 is spaced apart from the upper surface 111 of the printed circuit board 110 by a predetermined interval, and substantially parallel to the upper surface 111 of the printed circuit board 110. It may include a horizontal portion 131 and a plurality of vertical portions 132 extending toward the upper surface 111 of the printed circuit board 110 in a vertical direction from both side ends of the horizontal portion 131.

The mounting portion 134 for mounting a cooling member may be formed in the horizontal portion 131 of the upper shield member 130, and the mounting portion 134 may have an opening through which external air flows into the upper shield member. And a fastening part for mounting with the cooling member 160 formed in the peripheral area of the opening.

In addition, the cooling member 160 may be a cooling fan, and outside air may flow between the upper shield member 130 and the printed circuit board 110 through the opening 134 of the upper shield member 110 by the cooling fan. It may be forced into the space of the, thereby cooling the upper surface 111 of the printed circuit board 110.

4 and 5, the upper shield member 130 may further include a heat dissipation pad 172 for cooling individual elements such as a signal receiver or a signal transmitter of the printed circuit board 100.

The heat dissipation pad 172 may be attached to an end portion of the bracket 171 mounted on the upper shield member 130 to be in contact with the upper surface 111 of the printed circuit board 110.

FIG. 6 is a perspective view of the printed circuit board 110 and the intermediate shield member 140 of FIG. 4 coupled to each other.

4 and 6, the printed circuit board 110 has an upper surface 111 and a lower surface 112, and the upper shield member 130 has an upper surface 111 of the printed circuit board 100. The middle and lower shield members 140 and 150 correspond to the lower surface 112 of the printed circuit board 100.

Various elements such as the signal receiver 116 and the signal processor 117 are mounted on the lower surface 112 of the printed circuit board 110.

In addition, a recess 113 may be formed on a top surface of the printed circuit board 110 at a position corresponding to a bottom surface on which the signal receiver 116 or the signal processor 117 is mounted.

Accordingly, the above-described heat dissipation pad 172 may be located in the recess, thereby effectively dissipating heat to each element mounted on the lower surface.

As described above, the signal receiver 116 may be a set top box (not shown) or a cable terminal exposed to the outside of the wireless signal receiver or display device for wireless communication with an external device.

In addition, a heat dissipation member 115 may be mounted on the lower surface 112 of the printed circuit board 110, and the heat dissipation member 115 may include a plurality of fins for widening a contact area with external air. It may be a heat sink having.

The intermediate shield member 140 may include a main body portion 141 having a frame shape having a hollow portion 143 and a plurality of legs extending from the edge portion of the main body portion 141 toward the printed circuit board 110. 144).

In addition, a binding protrusion 142 spaced at a predetermined interval may be formed on a side surface of the main body 141.

The lower shield member 150 surrounds the main body 141 of the intermediate shield member 140 and an opening for exposing the heat dissipation member 115 mounted on the lower surface of the printed circuit board 110 to the outside. A body portion 151 having a plurality of heat dissipation holes 153 and a binding hole 155 formed to correspond to a position at which a binding protrusion of the intermediate shield member 140 is formed on a side of the body portion 151. And a fastening part 154 for coupling the front cover 10 and the rear cover 50 or the display module 30 to each other.

Hereinafter, a method of assembling the upper shield member 130, the middle shield member 140, the lower shield member 150, and the printed circuit board 110 constituting the printed circuit board module 100 will be described in detail with reference to the accompanying drawings. Explain.

1, 4, and 6, the intermediate shield member 140 may be mounted to the upper shield member 130 through a first fastening means and grounded to the printed circuit board 110.

The first binding means is not limited thereto, but the first binding means corresponds to a position of the first through hole 114 and the first through hole 114 that penetrate the upper and lower surfaces of the printed circuit board 110. It extends from the second through hole 133 and the intermediate shield member 140 formed in the upper shield member 130, and passes through the first through hole 114 and the second through hole 133 in order, The end portion 144a may include a leg 144 coupled to the upper shield member 130.

In this case, referring to FIG. 6, the boundary A between the first through hole 114 of the printed circuit board 110 and the leg 144 of the intermediate shield member 140 may be soldered. Therefore, the electromagnetic wave of the printed circuit board 110 may be reduced by grounding the first binding means.

FIG. 7 is a perspective view of a state in which the middle shield member and the lower shield member of FIG. 4 are coupled, and FIG. 8 is a perspective view of a state in which each component member of FIG. 4 is coupled.

Meanwhile, referring to FIGS. 4 and 8, the upper shield member 130 and the intermediate shield member 140 may be coupled in various ways. In one embodiment, the second through hole of the upper shield member 130 may be formed. Binding the upper shield member 130 and the intermediate shield member 140 by bending the end portion 144a of the leg 144 of the intermediate shield member 140 that has passed through 133 to contact the upper surface of the upper shield member. You can.

Unlike this, the boundary B between the upper shield member 130 and the intermediate shield member 140 may be screwed or soldered to each other, but each component member may be required to repair the printed circuit board module 100. In order to facilitate disassembly of the leg, the longitudinal end of the leg 144 may be bent and bound to increase repair characteristics.

Therefore, during repair, the upper shield member 130 can be easily disassembled by unfolding the end portion 144a of the bent leg 144, so that the upper surface 111 of the printed circuit board 110 is Exposure to the outside makes it easy for the operator to observe or repair.

4 and 7, the lower shield member 150 and the intermediate shield member 140 may be detachably coupled through a second binding means in order to increase repair characteristics.

In addition, in order to increase the electromagnetic shielding effect, the lower shield member 150 is preferably mounted to the intermediate shield member 140 in a state surrounding the outer peripheral surface of the body portion 141 of the intermediate shield member 140 at all times.

In one embodiment for detachably coupling, the second binding means includes a binding protrusion 142 formed on an outer circumferential surface of the body portion 141 of the intermediate shield member 140 and the binding protrusion of the lower shield member 150. A binding groove or a binding hole 155 formed at a position corresponding to 142 may be included.

Alternatively, the second binding means is a position corresponding to the binding groove or the binding hole formed on the outer circumferential surface of the main body portion 141 of the intermediate shield member 140 and the binding groove or the binding hole of the lower shield member 150. It may include a binding protrusion formed in.

In this way, by detachably coupling the lower shield member 150 and the intermediate shield member 140, when repair is required to the printed circuit board module 100, the binding protrusion inserted into the binding groove or the binding hole is removed to lower the lower portion. Since the shield member 150 may be separated from the intermediate shield member 140, the lower surface 112 of the printed circuit board 110 may be exposed to the outside, so that the operator may easily observe or repair the shield member 150.

Accordingly, the printed circuit board module 100 may effectively shield electromagnetic waves of the printed circuit board by the shield 120, and may be disposed on the cooling member 160, the heat radiation pad 172, and the plurality of heat radiation holes 151. As a result, the heat generated from the elements of the printed circuit board can be effectively cooled.

In addition, since the upper shield member 130 and the lower shield member 150 are easily disassembled, the upper and lower surfaces of the printed circuit board can be easily exposed to the outside, thereby providing excellent repair characteristics.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

1 is a perspective view showing a display device according to an embodiment of the present invention.

2 is a cross-sectional view illustrating main parts of a display device according to an exemplary embodiment.

3 is a perspective view showing a printed circuit board module related to the present invention.

4 is a perspective view of a state in which each component of Figure 3 is separated.

5 is a bottom perspective view of the upper shield member of FIG. 4.

6 is a perspective view of a state in which the printed circuit board and the intermediate shield member of FIG. 4 are coupled;

7 is a perspective view of a state in which the middle shield member and the lower shield member of FIG. 4 are coupled;

FIG. 8 is a perspective view of a state in which each component of FIG. 4 is coupled. FIG.

Claims (19)

Display module; A printed circuit board having a signal receiving unit and a signal processing unit and transferring the processed signal to a display module; A shield covering a front surface and a rear surface of the printed circuit board, wherein a partial area is grounded to the printed circuit board; And And a cooling member mounted to the shield for cooling the printed circuit board. The method of claim 1, wherein the shield, An upper shield member surrounding an upper surface of the printed circuit board and provided with a mounting part for a cooling member; An intermediate shield member mounted to the upper shield member through a first binding means and grounded to the printed circuit board; And And a lower shield member mounted to the intermediate shield member through a second binding means and surrounding the lower surface of the printed circuit board. The method of claim 2, wherein the first binding means, A first through hole penetrating the upper and lower surfaces of the printed circuit board; A second through hole formed in the upper shield member to correspond to the position of the first through hole; And And a leg extending from the intermediate shield member and sequentially passing through the first through hole and the second through hole, one end of which is coupled to the upper shield member. The method of claim 3, wherein And a boundary portion between the first through hole of the printed circuit board and the leg of the intermediate shield member is soldered to each other. The method of claim 3, wherein And an end portion of the leg of the intermediate shield member passing through the second through hole of the upper shield member is bent to contact the upper surface of the upper shield member. The method of claim 2, And the lower shield member is mounted to the intermediate shield member while surrounding the outer circumferential surface of the intermediate shield member. The method of claim 2, wherein the second binding means, A binding protrusion formed on the intermediate shield member; And And a binding groove or a binding hole formed at a position corresponding to the binding protrusion of the lower shield member. The method of claim 2, The lower shield member is provided with a plurality of heat dissipation holes. The method of claim 1, And the cooling member is a cooling fan. The method of claim 1, And a heat dissipation member mounted on a lower surface of the printed circuit board. The method of claim 2, The upper shield member is provided with a heat dissipation pad in contact with the element mounted on the printed circuit board. A printed circuit board having one or more devices mounted thereon; A shield covering a front surface and a rear surface of the printed circuit board, wherein a partial area is grounded to the printed circuit board; And Printed circuit board module comprising a cooling member mounted to the shield for cooling the printed circuit board. The method of claim 12, wherein the shield, An upper shield member surrounding a front surface of the printed circuit board and provided with a mounting portion for a cooling member; An intermediate shield member mounted to the upper shield member through a first binding means and grounded to the printed circuit board; And And a lower shield member mounted to the intermediate shield member through a second binding means and surrounding a rear surface of the printed circuit board. The method of claim 13, wherein the first binding means, A first through hole penetrating the front and rear surfaces of the printed circuit board; A second through hole formed in the upper shield member to correspond to the position of the first through hole; And The printed circuit board module extending from the intermediate shield member, and through the first through hole and the second through hole, one end portion includes a leg coupled to the upper shield member. The method of claim 14, And a boundary portion between the first through hole of the printed circuit board and the leg of the intermediate shield member is soldered to each other. The method of claim 14, Printed circuit board module, characterized in that the end portion of the leg of the intermediate shield member passing through the second through hole of the upper shield member is bent to contact the upper surface of the upper shield member. The method of claim 14, wherein the second binding means, A binding protrusion formed on the intermediate shield member; And And a coupling groove or a binding hole formed at a position corresponding to the binding protrusion of the lower shield member. The method of claim 13, Printed circuit board module, characterized in that the lower shield member is provided with a plurality of heat dissipation holes. 13. The method of claim 12, The printed circuit board module, characterized in that the cooling member is a cooling fan.

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