KR200437540Y1 - A fixing implement of shield case for pcb - Google Patents

Abstract

The present invention relates to a shielding case fixing mechanism for a printed circuit board, an object of the present invention is to facilitate the fixing operation of the shielding case is installed to cover the electronic components on the printed circuit board to block the electromagnetic interference SMT ( It is to provide a shielding case fixing mechanism for a printed circuit board that can be used for the automatic soldering process by Surface Mount Technology) equipment for fixing the shielding case.

Another object of the present invention is to provide a shielding case fixing mechanism for a printed circuit board, which is provided to prevent the electronic component from being damaged during the fixing operation of the shielding case installed to cover the electronic component on the printed circuit board to block electromagnetic interference. It is.

In addition, another object of the present invention is a shielding case for a printed circuit board provided to facilitate the fixing operation of the shielding case that is installed to cover the electronic component, while making it easy to replace and repair the electronic component covered by the shielding case It is to provide a fixing mechanism.

To this end, the shielding case fixing mechanism for a printed circuit board according to the present invention is for fixing the shielding case covering the electronic component to the printed circuit board to shield electromagnetic interference generated from the electronic component mounted on the printed circuit board. And a plurality of fixing parts fixed in contact with the printed circuit board, and a clamping part provided between the fixing parts to pick up the sidewall of the shielding case in the form of tongs.

Description

Shielding Fixture for Printed Circuit Boards {A FIXING IMPLEMENT OF SHIELD CASE FOR PCB}

1 is a perspective view showing a state before a conventional shielding case is installed on a printed circuit board, showing a state in which the shielding case is separated into a cover member and a frame member.

2 is a cross-sectional view showing a state where a conventional shielding case is installed on a printed circuit board.

Figure 3 is a perspective view showing a fixed structure of the shielding case according to an embodiment of the present invention, showing a state in which the shielding case is separated from the printed circuit board.

Figure 4 is a perspective view showing a fixing structure of the shielding case according to an embodiment of the present invention, showing a state in which the shielding case is installed on a printed circuit board.

5 is a perspective view showing the structure of a fixing mechanism according to an embodiment of the present invention.

6 is a cross-sectional view illustrating an operation state in which the side wall of the shielding case is inserted into the clamping portion of the fixing mechanism of FIG. 5, FIG. 6A illustrates a state before the side wall is inserted into the clamping portion, and FIG. 6B illustrates the side wall of the clamping portion. It is inserted into the clamped state.

7 is a perspective view showing the structure of another fixing mechanism according to another embodiment of the present invention.

8A, 8B and 8C are cross-sectional views sequentially illustrating operations of inserting sidewalls of the shielding case into the clamping portions of the fixing mechanism of FIG. 7.

* Description of the symbols for the main parts of the drawings *

10: printed circuit board 20: electronic components

30: shield case 31: side wall

40, 40 °: Fixing mechanism 41: End fixing part

42: central stationary government 43: clamping section

50, 60: elastic piece 51, 61: first gripping portion

52, 62, 52 ＇, 62＇: Second gripping portion 52 a, 62 a, 52 a ＇, 62 a＇: Fixed end

52b, 62b, 52b ＇, 62b＇: Free end 53: Crimping projection

70: base

The present invention relates to a shielding case fixing mechanism for a printed circuit board, and more particularly, to install and cover the electronic component to block electromagnetic interference while facilitating replacement and maintenance work of the electronic component mounted on the printed circuit board. It relates to a shielding case fixing mechanism for a printed circuit board provided to facilitate the fixing operation of the shielding case.

In general, while electromagnetic waves have useful side effects such as wireless communication and radar, they may adversely affect the operation of electronic devices. This phenomenon is called an electromagnetic interference (EMI) phenomenon. Not only does it generate noise, it also acts as a harmful element to the human body.

Therefore, recently, by covering certain electronic components such as semiconductor devices mounted on the printed circuit board inside the electronic device with a predetermined shielding case to block the EMI generated from the electronic components affects the operation of the electronic device as well as other electronic devices. To keep you from falling.

1 and 2 illustrate a fixing structure of a shielding case 3 installed on a printed circuit board 1 to block EMI of a conventional electronic component 2.

As shown in FIGS. 1 and 2, an electronic component 2 such as a semiconductor device is first mounted on the printed circuit board 1, and the shielding case 3 covers the electronic component 2. It is installed on (1).

The shielding case 3 is formed by combining the frame member 4 provided to surround the outside of the electronic component 2 and the cover member 5 provided to cover the upper end of the frame member 4. In the case of the cover member 5 is detachably coupled to the upper end of the frame member 4, the frame member 4 is an insertion hole formed in the printed circuit board 1 has an insertion portion (4a) formed at the lower end ( It is fixed on the printed circuit board 1 by soldering in the state inserted in 1a).

The cover member 5 is detachably installed from the frame member 4 because the cover member 5 is fixed to the printed circuit board 1 by soldering to prevent separation. In order to repair and replace the electronic parts (2) inside the shielding case (3) with only (5) removed. A hook 5a is formed at an edge of the cover member 5 for attaching and detaching the cover member 5, and a hook insertion groove 4b is formed in the frame member 4 at a position corresponding to the hook 5a. Is formed.

However, in the shielding case 3 fixing structure of the conventional printed circuit board 1, the frame member 4 must be fixed on the printed circuit board 1 through soldering, and of course, the frame member 4 is fixed. The cover member 5 must be fastened separately at the top, and the soldering structure of the shielding case 3 is automatically soldered by SMT (Surface Mount Technology) equipment due to the soldering structure of the insertion portion 4a and the insertion hole 1a. There was a problem that can not be carried out through the process.

In the process of soldering the mold member 4, the mold member 4 surrounding the electronic component 2 is heated as a whole. In this case, the electronic component 2 disposed inside the mold member 4 is heated by heat. Damage and breakage will occur.

The present invention is to solve the above problems, an object of the present invention is to facilitate the fixing operation of the shielding case installed to cover the electronic components on the printed circuit board to block the electromagnetic interference, while Surface Mount Technology (SMT) It is to provide a shielding case fixing mechanism for a printed circuit board that can be used for the automatic soldering process by the equipment for fixing the shielding case.

Another object of the present invention is to provide a shielding case fixing mechanism for a printed circuit board, which is provided to prevent the electronic component from being damaged during the fixing operation of the shielding case installed to cover the electronic component on the printed circuit board to prevent electromagnetic interference. To provide.

In addition, another object of the present invention is a shielding case for a printed circuit board provided to facilitate the fixing operation of the shielding case that is installed to cover the electronic component, while making it easy to replace and repair the electronic component covered by the shielding case It is to provide a fixing mechanism.

In order to achieve this purpose, the shielding case fixing mechanism for a printed circuit board according to the present invention fixes the shielding case covering the electronic component to the printed circuit board to shield electromagnetic interference generated from the electronic component mounted on the printed circuit board. To this end, it characterized in that it comprises a plurality of fixing parts which are fixed in contact with the printed circuit board, and a clamping portion provided between the fixing parts so as to pick up the side wall of the shielding case in the form of tongs.

The clamping part includes a base part provided to support the end of the side wall, and a pair of elastic pieces extending to face each other on both sides of the base part so that the side wall is inserted therebetween, and each of the elastic piece parts includes: Each of the first and second gripping portions provided to press the inner surface and the outer surface to be gripped elastically is provided, respectively, wherein either one of the first and second gripping portions receives a force in a direction in which the other one opens. In this case, it is characterized in that it is provided to receive a force in the direction of pressing the side wall.

 In addition, the first gripping portion is formed by bending the elastic piece portion to be convex into the clamping portion, and the second gripping portion is fixed so that the fixed end is fixed to the first gripping portion and the free end is located inside the clamping portion. The elastic piece is bent in a cut state, and the distance between the free ends of each second gripping portion is equal to or smaller than the distance between the first gripping portions.

In addition, the second gripping portion is characterized in that it is provided to grip the lower side of the side wall than the first gripping portion.

The second gripping portion may be inclined downward from the fixed end toward the free end.

In addition, the clamping portion is provided in plural, one of the plurality of fixing portion forms a central fixing part located in the center of the longitudinal direction of the fixing mechanism, the fixing mechanisms on both sides of the central fixing portion is mutually symmetrical in weight and shape At one side of the central fixing portion is extended in a direction perpendicular to the longitudinal direction of the fixing mechanism is characterized in that the width extension portion is provided so that the width of the central fixing portion is larger than the width of the clamping portion.

In addition, the extension length of the extension portion is characterized in that it is provided less than the total width of the central fixing section and larger than half the length of the central fixing section.

In addition, the fixing portion is provided between both ends of the longitudinal direction of the fixing mechanism and the clamping portion is characterized in that it is soldered to the printed circuit board.

Next, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 respectively show a state in which the shielding case 30 is separated from the printed circuit board 10 and fixed to the printed circuit board 10 in the present embodiment.

As shown in FIGS. 3 and 4, an electronic component 20 such as a semiconductor device is mounted on one side of the printed circuit board 10, and the electronic component 20 is disposed outside the electronic component 20. A shielding case 30 is installed to cover 20 and block EMI of the electronic component 20.

In this embodiment, the shield case 30 is detachably coupled to the printed circuit board 10, which is enabled through the fixing mechanism 40 shown in detail in FIG.

First, the shielding case 30 has four sidewalls 31 and an upper wall 32 integrally formed to cover the electronic component 20 therein by taking a rectangular box shape having an open bottom. The shielding case 30 may be formed of a plated steel sheet or the like for effective electromagnetic shielding.

In addition, the fixing device 40 is coupled to the printed circuit board 10 around the electronic component 20 to clamp and detach the lower sidewall 31 of the lower side of the shielding case 30 in a detachable manner. The mechanism 40 is disposed on the printed circuit board 10 around the electronic component 20 at a position corresponding to each side wall 31 of the shielding case 30 so as to correspond to the number of the side walls 31. In addition, a stepped groove 31a is formed at the lower end of the center side which is substantially clamped to the fixing mechanism 40 in the side wall 31 so that the stepped groove 31a is in the state where the side wall 31 is clamped to the fixing mechanism 40. It is preferable that a gap is not formed between the lower ends of the sidewalls 31 on both sides and the printed circuit board 10.

The fixing mechanism 40 may include the fixing parts 41 and 42 fixed to the printed circuit board 10 and the shielding case 30 to be detachably coupled to the printed circuit board 10. A pair of clamping parts 43 provided to pick up the side wall 31 of the () in the form of tongs.

Referring to FIGS. 5 and 6, first, the fixing parts 41 and 42 are disposed between the pair of end fixing parts 41 provided at both ends in the longitudinal direction of the fixing device 40, and the clamping part 43. It is configured to include a central fixing part 42 is provided in, and the ends and the central fixing parts (41, 42) are soldered and bonded to contact the printed circuit board 10 through the lower surface. Accordingly, in the fixing structure of the shielding case 30 using the fixing mechanism 40, the fixing operation of the shielding case 30 may be performed through an automatic soldering process by surface mount technology (SMT) equipment.

In addition, the fixing mechanism 40 is moved toward the printed circuit board 10 in a state of being sucked by the nozzle of the SMT equipment is mounted on the printed circuit board 10, the central fixing portion in the fixing mechanism 40 ( 42 is to form a suction surface for the nozzle, in the fixing mechanism 40 so that the fixing mechanism 40 is inclined to one side in the state that the central fixing portion 42 is vacuum-adsorbed to the nozzle Both sides of the central fixing portion 42 is preferably provided so that the weight or form is symmetric with each other.

On the other hand, since the clamping portions 43 on both sides of the central fixing part 42 may interfere with the operation of the nozzle for vacuum suction of the central fixing part 42, the central fixing part 42 is fixed in order to prevent this. It is preferable to be formed long in the longitudinal direction of the mechanism 40. However, at this time, the length of the fixing mechanism 40 is excessively long, so that the area occupied by the fixing mechanism 40 on the printed circuit board 10 may be excessively large.

In order to solve this problem, in this embodiment, one side of the central fixing part 42 extends in a direction perpendicular to the longitudinal direction of the fixing mechanism 40 so that the width of the central fixing part 42 is the clamping part 43. The width extension portion 42a is provided to be larger than the width of the width extension portion 42a. The width extension portion 42a is positioned inside the shielding case 30 in the process of fixing the fixing mechanism 40 to the printed circuit board 10. Done. For reference, in the drawing, an imaginary line is drawn between the central fixing part 42 and the deflation extension part 42a for the display of the deflation extension part 42a.

Therefore, when the nozzle is vacuum-adsorbed the width extension portion (42a), there is no fear that the fixing mechanism 40 is tilted to one side, as well as the clamping portion 43 on both sides of the central fixing portion 42 in the vacuum suction process of the nozzle There is no possibility of interference, and the area that the fixing mechanism occupies substantially in the printed circuit board 40 does not increase due to the width extension portion 42a.

In this case, the extension length of the width extension portion 42a may facilitate the vacuum suction operation of the nozzle, and the overall width of the central fixing portion 42 may be such that interference between the width extension portion 42a and the electronic component 20 does not occur. It is desirable to provide smaller and larger than half the length of the central fixing part 42.

Each of the clamping parts 43 may include a base part 70 provided to support a lower end of the side wall 31 of the shielding case 30, and both sides of the base part 70 so that the side wall 31 is inserted therebetween. And a pair of elastic piece portions 50 and 60 extending upwardly from each other to face each other.

Here, the base portion 70 is formed to be spaced apart a predetermined interval between the fixing portion (41, 42) to the upper portion of the printed circuit board 10 so as to perform a buffering action as the shielding case (30) is pressed downward When the clamping part 43 is clamped, the shock is suppressed from being transferred to the printed circuit board 10. For reference, reference numeral 44 is a connection part formed to be inclined to connect between the base part 70 of the clamping part 43 and the fixing parts 41 and 42.

The elastic piece portions 50 and 60 are provided with first holding portions 51 and 61 which are bent so as to be convex toward the side walls 31 inserted between the elastic piece portions 50 and 60 in the vertical direction. In addition, the inner and outer surfaces of the side wall 31 inserted into the clamping portion 43 through the first holding portions 51 and 61 are elastically pressed to fix the first holding portions 51 and 61. In the lower portion, the second grip portion (50) and the second grip portion (50, 60) along the longitudinal direction of the fixing mechanism (40) are pressed to fix the sidewall (31) together with the first grip portions (51, 61). 52, 62 are formed by incision. The second gripping portions 52 and 62 are formed by cutting the edges other than the fixing ends 52a and 62a so that the fixed ends 52a and 62a are fixed to the first gripping portions 51 and 52, and the free ends after the cutting. 52b and 62b are bent to be positioned inside the clamping portion 43. In the present embodiment, the second holding portions 52 and 62 are provided to be parallel to each other and each of the second holding portions 52 and 62 is free. Compression protrusions 53 and 63 are formed on the surfaces of the ends 52b and 62b facing each other.

The distance between the first and second holding portions 51 and 61 and the second and second holding portions 52 and 62 between the elastic piece portions 50 and 60 is such that the first and second holding portions 51, 61, 52, It is formed smaller than the thickness of the side wall 31 so as to elastically press and fix the side wall 31 inserted between the elastic pieces 50, 60 through 62, the pressing projections 53, 63 are mutually It is formed to be in close contact with the side wall 31 is provided to press firmly fixed. In addition, the distance between the upper side of the first holding portion (51, 61) elastic piece (50, 60) is the upper side to guide the insertion operation of the side wall 31 is inserted into the clamping portion (43) It is preferably formed to be larger than the thickness of 31) and narrower toward the bottom.

Next, with reference to Figure 6 will be described the fixing process and the resulting effects of the shielding case 30 using the fixing mechanism according to this embodiment.

In order to fix the shielding case 30 to the printed circuit board 10, the fixing mechanisms 40 are first fixed to the printed circuit board 10 around the electronic component 20. At this time, each of the fixing mechanism 40 is moved to the printed circuit board 10 in a state that the width extension portion 42a is vacuum-adsorbed by the nozzle of the SMT equipment so that each of the fixing portions 41 and 42 is a printed circuit. In the state bonded to the substrate 10 is fixed on the printed circuit board 10 through an automatic soldering process.

Therefore, in the fixing structure of the shielding case 30 according to the present embodiment, the installation of the fixing mechanism 40 for fixing the shielding case 30 can be performed through an automatic soldering process by SMT (Surface Mount Technology) equipment. Will be. In addition, the fixing mechanism 40 is mounted on the printed circuit board 10 in a vacuum suction state to the nozzle through the width extension portion 42a formed to increase the width of the central fixing portion 42, in this case the central fixing portion 42 Both clamping parts 43 do not interfere with the vacuum suction operation of the nozzle, thereby enabling the vacuum suction operation of the fixing mechanism 40 to be more smoothly performed. In addition, since the fixing mechanism 40 is slightly heated during soldering, its heat is not transferred to the electronic component 20 due to its small volume.

And before the shielding case 30 is fixed, the clamping portion 43 of the fixing mechanism 40 is such that the crimping projections 53 and 63 are almost in contact with each other, as shown in Figure 6a, in this state When the lower end of the step groove 31a of each side wall 31 of the shielding case 30 is inserted between the elastic piece portions 50 and 60 that form the respective clamping portions 43 in the corresponding fixing mechanism 40, FIG. As shown in FIG. 6B, the inner and outer surfaces of the side wall 31 are separated between the first and second holding parts 51 and 61 and the second holding part between the elastic pieces 50 and 60. 52 and 62, the shielding case 30 is clamped and fixed to the fixing mechanism 40 while being fixed to the shielding case. In this state, the electronic component 20 is shielded to be housed in the shielding case 30. Covered at 30, EMI shielding. At this time, when the gap between the first holding portion (51, 61) is opened, the free end of the second holding portion (52, 62), the fixed end (52a, 62a) is fixed to the first holding portion (51, 61) Since the sides 52b and 62b are forced toward the side walls 31, the first holding portions 51 and 61 press the side walls 31 through the restoring force of the elastic pieces 50 and 60, and the second The grippers 52 and 62 press the sidewalls 31 by the reaction force between the first grippers 51 and 61 by the sidewalls 31.

In addition, in the fixed structure of the shielding case 30, the shielding case 30 does not need to be manufactured in a separate type in order to withdraw the electronic component 20 during repair and replacement of the electronic component 20 inside the shielding case 30. Rather, each side wall 31 of the shielding case 30 is released from the clamping part 43 of the fixing mechanism 40 by a simple operation of lifting the shielding case 30 upward. ) Can be easily withdrawn, while the structure of the shielding case 30 is simplified, and the shielding case 30 can be manufactured through a single mold, but the replacement and repair work of the electronic component 20 is also easily performed. .

On the other hand, in the fixing mechanism (40 ＇) according to another embodiment of the present invention, the second holding portion (52＇, 62 ＇) is a state in which the pressing projection (53, 63) is removed, unlike the embodiment described above In this case, the distance between the free ends 52b 'and 62b' may be inclined so as to be smaller than the distance between the first holding parts 51 and 61. 7 to 8 show the structure of the fixing mechanism 40 'according to another embodiment of the present invention in which the second gripping portions 52' and 62 'are inclined.

For reference, in the case of the fixing mechanism 40 'according to the present embodiment, the remaining structures except that the compression protrusions 53 and 63 are deleted and the second holding portions 52' and 62 'are inclined are described above. Since it is the same as the embodiment, hereinafter, only the structures of the second holding portions 52 'and 62' will be mentioned.

In the fixing mechanism 40 'according to the present embodiment, the second holding portions 52' and 62 'are lowered from the fixing ends 52a' and 62a 'fixed to the first holding portion 52 side. It is formed to be inclined downward toward the free ends 52b 'and 62b'.

Therefore, at this time, as shown in FIG. 8B, the sidewalls 31 are inserted between the first holding portions 51 and 61 while the first holding portions 51 and 61 are opened in the arrow " A " direction. Since the free ends 52b ＇and 62b 의 of the two grip parts 52＇ and 62 ＇are forced to contact each other along the direction of the arrow“ B ”, the second grip parts 52 which are forced to touch each other afterwards. When the side wall 31 is continuously inserted between the ＇and 62＇, the strong grip of the side wall 31 by the second holding portions 52 ＇and 62 에서도 even when the compression protrusions 53 and 63 are deleted. Becomes possible.

In addition, the clamping part 43 holds the first side and the side wall 31 by the first and second gripping parts 51, 61, 52 ＇, 62＇ as described above. Although the distance between the branches 51 and 61 is slightly larger than the thickness of the side wall 31, the free end 52b of the second holding portions 52 ＇and 62＇ may be prevented from properly holding the side wall 31. Since it is possible to maintain the narrowed state between the ＇and 62b ′, the gripping operation of the side wall 31 by the second gripping portions 52＇ and 62 계속 can be continuously performed as it is.

As described in detail above, when the shielding case fixing mechanism for a printed circuit board according to the present invention is used, first, the shielding case can be easily fixed and detached in a one-touch manner through the fixing mechanism, and the fixing mechanism is SMT. (Surface Mount Technology) It can be fixed to the printed circuit board through the automatic soldering process by the equipment is advantageous to automate and speed up the fixing work of the shield case.

In addition, the shielding case fixing mechanism for a printed circuit board according to the present invention, even if the heating is somewhat heated in the process of being fixed to the printed circuit board by soldering, the heat of the fixing mechanism is small enough to damage the electronic components inside the shielding case Since it is not transmitted, it is possible to effectively prevent the electronic component from being damaged during the fixing of the shielding case.

In addition, the shielding case fixing mechanism for a printed circuit board according to the present invention is that the shielding case can be fixed and separated on the printed circuit board by a one-touch method through the fixing mechanism so that the structure of the shielding case can be simplified to manufacture the shielding case And while the management is easy, the replacement and maintenance of the electronic components covered by the shielding case can also be easily performed.

Claims (8)

A plurality of fixing parts fixed to the printed circuit board to fix the shielding case covering the electronic component to the printed circuit board to shield electromagnetic interference generated from the electronic component mounted on the printed circuit board; And a clamping part provided between the fixing parts to pick up the side wall of the shielding case in the form of tongs. The method of claim 1, The clamping portion includes a base portion provided to support the end of the side wall, and a pair of elastic pieces extending to face each other on both sides of the base portion so that the side wall is inserted therebetween, Each of the elastic pieces may be provided with a first and second holding portions respectively provided to press and hold between the inner surface and the outer surface of the side wall elastically, Any one of the first and second gripping portion is a shielding case fixing mechanism for the printed circuit board, characterized in that provided with a force in the direction to press the side wall when the force is applied in the direction of the other one. The method of claim 2,  The first gripping portion is formed by bending the elastic piece to be convex into the clamping portion, The second gripping portion is bent in an incised state to the elastic piece such that a fixed end is fixed to the first gripping portion and a free end is located inside the clamping portion. The distance between the free ends of the second gripping portion is a shielding case fixing mechanism for the printed circuit board, characterized in that the same or less than the distance between the first gripping portion. The method of claim 3, wherein And the second gripping portion is provided to grip a lower side of the side wall than the first gripping portion. The method of claim 3, wherein And the second gripping portion is inclined downward from the fixed end toward the free end. The method of claim 1, The clamping part is provided in plural, one of the plurality of fixing parts forms a central fixing part which is located at the center of the longitudinal direction of the fixing mechanism, and the fixing mechanisms on both sides of the central fixing part are mutually symmetrical in weight and shape. Be, One side of the central fixing portion extends in a direction perpendicular to the longitudinal direction of the fixing mechanism is provided with a width extension portion for the width of the central fixing portion is larger than the width of the clamping portion is provided with a shielding case fixing mechanism for a printed circuit board . The method of claim 6, The extension length of the width extension portion is less than the overall width of the central fixing portion and the shielding case fixing mechanism for a printed circuit board, characterized in that provided larger than half the length of the central fixing portion. The method of claim 1, And the fixing part is provided between both longitudinal ends of the fixing device and the clamping part to be soldered to the printed circuit board.

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