KR20180005000A - Under Cover for PCB assembly - Google Patents

Abstract

The present invention relates to an under cover for a substrate assembly. An internal space (12) for a printed circuit board (P) is formed in a frame (11) of the under cover (10) for the substrate assembly. A mounting combining unit (13) is formed on one side of the frame. Elastic bosses (20, 20) are formed to further protrude than a side wall (15) on each edge of the frame (11). The elastic bosses (20, 20) extend leg units (23, 23) from the frame (11). Head units (25, 25) are formed on front ends of the leg units (23, 23). Elastic arm units (27, 27), which are elastically deformed, are extended from the head units (25, 25). An elasticity supporting unit (29) is formed in the leg unit (23) of the first elastic boss (20). A hooking protrusion (29) is formed on the elastic arm unit (27) of the second elastic boss (20). The printed circuit board (P) is fixed by enabling the elastic bosses (20, 20) to be inserted into a combining hole (H) of the printed circuit board (P). The present invention fixes the printed circuit board (P) at an accurate position; and reduces noise by minimizing a gap of the printed circuit board with the elastic bosses (20, 20) of the under cover.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an under cover for a PCB assembly,

The present invention relates to an under cover for a substrate assembly, and more particularly to an under cover for a substrate assembly for assembling a printed circuit board (PCB) to a box body.

A printed circuit board is a thin plate in which electrical components such as integrated circuits, resistors or switches are soldered. The electrical components provided on the substrate perform specific functions to drive the employed electronic devices. Such a substrate may be used by stacking a plurality of printed circuit boards with various functions of electronic devices becoming complicated. At this time, there is a substrate assembly in which a plurality of substrates are stacked and formed.

The substrate assembly is generally constructed such that the substrate is seated on the box body. The substrate is in the form of a plate having a predetermined width, and a circuit pattern is provided on the surface, and a plurality of electrical components such as semiconductor elements and relays are provided. In addition, a terminal is provided to connect the substrate and other external components.

A boss portion to be coupled to the box body is formed on one side of the corner of the substrate, and a corresponding through hole is formed on one side of the corner of the box body. However, since there is a clearance between the boss portion and the through-hole in the structure in which the substrate and the box body are fastened together, there is a problem that noise is generated due to the flow of the substrate.

In addition, there is also a problem that the substrate may not be fixed at the correct position of the box body, so that the alignment may become inaccurate in the operation of joining the electronic parts.

Korean Patent Publication No. 10-2012-0070720

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to securely fix a printed circuit board to a box body by firmly bonding a printed circuit board and an under cover.

Another object of the present invention is to minimize the clearance between the printed circuit board and the boss portion of the under cover to which the printed circuit board is coupled, thereby preventing flow and reducing noise.

According to an aspect of the present invention for achieving the above object, the present invention provides a printed circuit board including a printed circuit board through which a plurality of coupling holes are penetrated, a printed circuit board assembled to the lower surface of the printed circuit board, And a plurality of elastic bosses protruding from the undercover at positions corresponding to the engaging holes. The elastic boss is elastically deformed, and at least a portion of the elastic boss is elastically deformed, A first resilient boss having a first resilient arm portion that passes through one of the first and second resilient arms and presses the upper surface of the printed circuit board, and a second resilient arm portion that is elastically deformed and at least partially passes through the other resiliently- And a second elastic boss.

Wherein the first elastic boss is formed with two legs extending in parallel so as to protrude from the side wall, wherein the legs are formed integrally with the first head, and the legs extend from the first head to form a cantilever- And a pair of first elastic arms are extended.

A pair of resiliently deformable elastic support portions extending orthogonally to the first elastic arm portion and extending toward the first head portion are formed in a leg portion of the first elastic boss.

The distance between the tip of the first resilient arm and the tip of the resilient support is equal to or less than the thickness of the printed circuit board.

The second resilient boss may include a second resilient arm portion extending from the second head portion formed at the distal end of the connection portion and spaced apart from the connection portion so as to be elastically deformable in the direction of the connection portion, do.

The second elastic arm portion is formed with a latching protrusion protruding downwardly sloping from the second head portion toward the interruption of the second elastic arm portion to engage with the edge of the coupling hole of the printed circuit board.

The first elastic boss protrudes from one side edge of the under cover, and the second elastic boss protrudes from the adjacent corner.

The first elastic boss and the second elastic boss are arranged in pairs at positions facing each other diagonally.

At least two elastic bosses are provided so that the respective elastic arms are elastically deformed in different directions.

The elastic boss is further provided between the corners of the under cover.

In the under cover for a substrate assembly according to the present invention, the following effects can be obtained.

First, in the present invention, the elastic boss of the under cover is inserted into the through hole of the printed circuit board to firmly engage the printed circuit board, thereby fixing the printed circuit board to the correct position.

In addition, since the elastic boss of the under cover to which the printed circuit board is coupled prevents the vertical and lateral clearances of the printed circuit board, the flow is minimized and noise is reduced.

1 is an exploded perspective view of a box body to which an under cover for assembling a substrate according to an embodiment of the present invention is applied.
2 is a perspective view of an under cover for assembling a substrate according to an embodiment of the present invention;
3 is an enlarged perspective view showing a first elastic boss according to an embodiment of the present invention;
4 is a sectional view showing a state in which the first elastic boss is engaged with the printed circuit board according to the embodiment of the present invention.
5 is an enlarged perspective view showing a second elastic boss according to an embodiment of the present invention;
6 is a sectional view showing a state in which the second elastic boss is engaged with the printed circuit board according to the embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

As shown in the drawings, an under cover 10 for a substrate assembly of the present invention comprises a frame 11 having an appearance and a frame. The frame 11 has a substantially rectangular shape and an internal space 12 in which the printed circuit board P can be positioned is formed therein.

On the other hand, a part of the under cover 10 is tightly coupled to the printed circuit board P. The printed circuit board P is formed to have a shape and size corresponding to the under cover 10 in this embodiment. Although not shown in this embodiment, the electronic parts are coupled to the upper surface of the printed circuit board P, though the coupling holes H are formed in the corners of the printed circuit board P.

At one side of the frame 11, a mounting portion 13 to which the vehicle block B is mounted is formed. In this embodiment, the mounting engagement portion 13 is formed protruding from the side wall 15, which will be described below the frame 11. The mounting portion 13 is formed integrally with the frame 11 by extending to the side wall 15 at one side edge of the frame 11 in this embodiment.

Side walls 15 are formed perpendicular to the edges of the frame 11. The side wall 15 is integrally formed with the frame 11 so that the internal space 12 is formed into a rectangular parallelepiped having one side opened.

A reinforcing rib (17) is formed in a part of the side wall (15) so as to be connected to the frame (11). The reinforcing ribs 17 are formed in such a manner that a plurality of the reinforcing ribs 17 protrude from the side wall 15 toward the inner space 12 so as to be orthogonal to the side wall 15 and the frame 11.

In the present embodiment, the reinforcing ribs 17 are formed to be polygonal so as to be inclined toward the printed circuit board P, but this is not necessarily so. The reinforcing ribs 17 may have a triangular shape or a fan shape having a predetermined curvature.

Elastic bosses 20 and 20 'protrude from one side of the frame 11. The elastic bosses 20 and 20 'are provided with a first elastic boss 20 and a second elastic boss 20'. The first elastic boss 20 and the second elastic boss 20 ' Bosses 20 'are formed so as to protrude from each other. That is, when the first elastic boss 20 protrudes from one side edge of the frame 11, a second elastic boss 20 'protrudes from the adjacent corner.

The first elastic boss 20 has a base portion 21 coupled to the reinforcing ribs 17 in a two-plate shape. The outermost one of the reinforcing ribs 17 is inserted and coupled between the base portions 21.

And a leg portion 23 extending from one side of the base portion 21 in a bar shape. The legs 23 protrude from each of the base portions 21 and are formed at positions higher than the side walls 15.

The first head 25 is connected to both ends of the leg 23. The first head part 25 is formed in a disc shape located between the leg parts 23 so that the pair of leg parts 23 are opposed to each other on both sides of the first head part 25, (23) are integrally formed.

A pair of first elastic arm portions 27 extend from the first head portion 25 to the side surfaces orthogonal to the leg portion 23. The first elastic arm part 27 is formed on both sides of the first head part 25 and is inserted into or released from the coupling hole H of the printed circuit board P when the first elastic boss 20 is inserted or removed Which is the most elastically deformed portion.

The first elastic arm part 27 is formed so as to be gradually wider toward the frame 11 and the tip end of the first elastic arm part 27 extends from the base part 21 to the printed circuit board P Of the thickness of the film. When the first elastic boss 20 is inserted into the coupling hole H, the tip of the first elastic arm portion 27 contacts the edge of the coupling hole H on the upper surface of the printed circuit board P, .

On the side of the leg portion 23, an elastic support portion 29 inclining upwards in a direction away from the leg portion 23 is formed. When the first elastic boss 20 is inserted into the coupling hole H, the tip of the elastic supporting portion 29 is located higher than the base portion 21 and contacts the lower surface of the printed circuit board P, So that the printed circuit board P is prevented from flowing downward.

In this embodiment, the pair of first elastic arm portions 27 and the pair of elastic supporting portions 29 are formed to be orthogonal to each other with the printed circuit board P interposed therebetween, The flow of the fluid is relatively more prevented.

If the pair of first elastic arm portions 27 and the pair of elastic supporting portions 29 are formed in parallel with each other, the printed circuit board P is fixed by the first elastic boss 20 There is a possibility that a rotational force is generated on the axis of the coupling hole H in which the first resilient boss 20 is inserted and is damaged.

On the other hand, the second elastic boss 20 'has a column portion 21' extending to the reinforcing rib 17. The column portion 21 'may be integrally protruded from the frame 11 or protruded from the side wall 15.

And a connecting portion 23 'protruding from the one side of the column portion 21' toward the printed circuit board P in a bar shape. The connection portion 23 'extends to a predetermined inclination in the outer direction of the column portion 21'.

A second head portion 25 'is formed at the tip of the connecting portion 23' and a second elastic arm portion 27 'is formed so as to face the connecting portion 23' from the second head portion 25 ' Respectively. The second elastic arm portion 27 'is the portion that is most elastically deformed when the second elastic boss 20' is inserted or removed into the coupling hole H of the printed circuit board P. [

The second elastic arm part 27 'is formed with a protruding protrusion 29' protruding from the second elastic arm part 27 'with respect to the second elastic arm part 27' As shown in Fig. The locking projection 29 'protrudes downwardly from the second head portion 25' to the middle portion of the second elastic arm portion 27 '.

Therefore, when the second elastic boss 20 'passes through the coupling hole H of the printed circuit board P, the front end surface of the locking projection 29' is caught by the edge of the coupling hole H , The outer surface of the second elastic arm portion 27 'elastically supports the inner surface of the coupling hole H to prevent the printed circuit board P from flowing in the lateral direction.

Hereinafter, the assembly process of the under cover for a substrate assembly according to the present invention having the above-described structure with the printed circuit board P will be described in detail.

Electric parts (not shown) such as a fuse and a relay can be installed in the vehicle block B and a printed circuit board P is installed in the vehicle block B to electrically connect the electric parts.

At this time, the printed circuit board P is first assembled to the under cover 10 for the substrate assembly, and the printed circuit board P is seated on the upper surface of the under cover 10 for the substrate assembly.

The first and second resilient bosses 20 and 20 'of the under cover 10 for the substrate assembly correspond to the engaging holes H of the printed circuit board P, So that the first and second elastic bosses 20 and 20 'pass through the coupling holes H, respectively.

The first and second elastic bosses 20 and 20 'may be seen to substantially simultaneously pass through the coupling holes H, The process of being inserted into any one of them will be described first.

The first resilient boss 20 passes through the first head portion 25 to one of the engaging holes H and elastically deforms while the first resilient arm portion 27 is inserted into the engaging hole H Start. When the first elastic boss 20 is inserted more than a predetermined portion, the tip of the elastic supporting portion 29 comes into contact with the lower surface of the printed circuit board P so that the elastic supporting portion 29 starts to be elastically deformed.

When the first elastic arm part 27 completely passes through the engagement hole H, the first elastic arm part 27 is elastically restored and the elastic support part 29 elastically deforms to press the printed circuit board P It becomes a state. The tip end of the first elastic arm part 27 is brought into close contact with the edge of the engaging hole H or one side of the upper surface of the printed circuit board P and the tip end of the elastic supporting part 29 contacts the printed circuit board P). Therefore, the upward and downward flows are all prevented by the first elastic boss (20) of the printed circuit board (P).

Next, a process of inserting the second elastic boss 20 'into another coupling hole H of the printed circuit board P will be described. Here, the other engagement hole H means one of the engagement hole H in which the first elastic boss 20 is inserted and another engagement hole H in the adjacent direction.

The second head 25 'of the second resilient boss 20' begins to be inserted into the engaging hole H and the engaging protrusion 29 'contacts the inner side of the engaging hole H, The arm portion 27 'is elastically deformed. When the degree of deformation of the elastic arm portion 27 'is large, a predetermined elastic deformation also occurs in the connection portion 23'.

When the printed circuit board P passes through the locking projection 29 ', the second elastic arm portion 27' is resiliently restored and the edge of the engagement hole H is resiliently restored to the front end surface of the locking projection 29 ' And the outer surface of the second resilient arm portion 27 'is pressed against the inner surface of the engagement hole H in close contact. Therefore, when the assembly of the printed circuit board P is completed, the printed circuit board P is prevented from flowing laterally by the second elastic bosses 20 '.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

For example, the first and second elastic bosses 20 and 20 'are not necessarily formed near the edge of the under cover 10 only. In the case where the under cover 10 and the printed circuit board P are formed to be large or long, more first and second elastic bosses 20 and 20 'may be formed along the longitudinal direction for more rigid coupling.

In addition, since flow occurs in various directions when the printed circuit board P flows in the lateral direction, when the second elastic bosses 20 'are plural in number, the second elastic arm portions 27' 'May be made different in the direction of elastic deformation so as to prevent various lateral flows.

In this embodiment, the first and second elastic bosses 20 and 20 'are protruded from one side of the frame 11, but they may be formed integrally with a part of the reinforcing ribs 17, And is coupled to the frame 11.

B: vehicle block 10: under cover
11: Frame 12: Interior space
13: engaging portion 15: side wall
17: reinforcing rib 20: first elastic boss
21: base part 23: leg part
25: first head part 27: first elastic arm part
29: elastic support portion 20 ': second elastic boss
21 ': column portion 23': connection portion
25 ': second head portion 27': second elastic arm portion
29 ': Stucker P: Printed circuit board
H: Combined ball

Claims (10)

A printed circuit board having a plurality of coupling holes formed therein,
An under cover which is assembled in correspondence with a lower surface of the printed circuit board and in which an inner space is formed in which the printed circuit board is coupled by side walls,
And a plurality of elastic bosses protruding from the undercover at positions corresponding to the engaging holes,
Wherein the elastic boss is elastically deformed and has a first elastic boss having a first elastic arm portion at least a portion of which passes through one of the engagement holes to press the upper surface of the printed circuit board, And a second resilient boss having a second resilient arm for resiliently supporting an inner surface of the edge.
[2] The apparatus according to claim 1, wherein the first elastic boss is formed with two legs extending in parallel to protrude from the side wall, a first head integrally formed on the leg, And a pair of first elastic arm portions of a cantilever shape extending in a direction in which the first elastic arm portions extend.
The under cover according to claim 2, wherein a leg portion of the first elastic boss is formed with a pair of elastic support portions extending orthogonally to the first elastic arm portion and extending toward the first head portion so as to be elastically deformable.
The under cover according to claim 1, wherein an interval between a tip of the first elastic arm part and a tip end of the elastic support part is formed to be equal to or smaller than a thickness of the printed circuit board.
The connector according to claim 1, wherein the second resilient boss is formed to extend from the side wall so that the connection part protrudes from the side wall, and is connected to the second head part formed at the distal end of the connection part and is elastically deformable in the direction of the connection part, And a second resilient arm portion is formed.
The printed circuit board according to claim 5, wherein the second elastic arm portion is provided with a locking protrusion protruding downward from the second head portion toward an end of the second elastic arm portion so as to be engaged with an edge of the coupling hole of the printed circuit board, .
The under cover according to any one of claims 1 to 6, wherein the first elastic boss protrudes from one side edge of the under cover, and the second elastic boss protrudes from a corner adjacent to the first boss.
The under cover according to claim 7, wherein the first elastic boss and the second elastic boss are arranged in pairs at positions facing each other diagonally.
The under cover according to claim 7, wherein at least two second elastic bosses are provided so that each elastic arm portion is elastically deformed in different directions.
8. The under cover of claim 7, wherein the elastic boss is further provided between the edges of the undercover.

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