TWI448234B - Fixing construction for printed circuit board - Google Patents

Description

Board fixed structure

The invention relates to a circuit board fixing structure, in particular to a circuit board fixing structure using a plastic stud.

In electronic products, there are generally circuit boards. In order to fix the circuit board to the housing of the electronic product, a circuit board fixing structure is generally required. For example, in a liquid crystal display device, a mask cover bottom plate with a metal stud is used as a circuit board fixing structure. The circuit board fixing structure cooperates with a plurality of screws to fix the circuit board to the mask cover.

However, in the circuit board fixing structure of the above liquid crystal display device, the stud is first fixed to the mask cover by riveting. Because the riveting requires special equipment, and the riveting work is strong, it requires more professional operation and takes a long time. Therefore, it is not conducive to shortening the production cycle of the product, and is not conducive to reducing the cost of the product.

In view of this, it is necessary to provide a circuit board fixing structure with a short production cycle and a low product cost.

A circuit board fixing structure includes a bottom plate and at least one stud mechanism. The at least one stud mechanism is fixed to the bottom plate. The bottom plate includes at least one fixing hole corresponding to the stud mechanism. Each stud mechanism includes a base. The base is straight prismatic. The cross-sectional contour shape of the base is a convex polygon. The cross-sectional contour shape of the base matches the shape of the fixing hole to prevent the stud mechanism from rotating relative to the bottom plate. The prismatic base includes a plurality of sides, each of which extends an elastic abutting piece. The elastic abutting piece includes a locking protrusion. The engaging protrusion is provided with a card slot, and the opposite sides of the card slot are respectively defined The first abutting surface and the second abutting surface, when the stud mechanism fixes the bottom plate of the circuit board, the stud mechanism is pressed into the fixing hole of the bottom plate, so that The first abutting surface and the second abutting surface of the card slot respectively abut the two surfaces of the bottom plate of the circuit board to hold the bottom plate of the circuit board.

Compared with the prior art, in the circuit board fixing structure of the present invention, the first abutting surface of the stud mechanism and the second abutting surface sandwich the bottom plate, and the base of the stud mechanism cooperates with the fixing hole to make the stud The mechanism does not rotate relative to the bottom plate, thereby securing the stud mechanism to the bottom plate. It can reduce the process of riveting studs in the prior art, reduce the use of riveting equipment, improve work operability, reduce labor intensity, and thus reduce production cycle and product cost.

1 and FIG. 2, FIG. 1 is a perspective exploded view of a first embodiment of a circuit board fixing structure according to the present invention. FIG. 2 is a perspective view showing the assembled structure of the circuit board shown in FIG. The circuit board fixing structure 1 includes a bottom plate 11, a plurality of stud mechanisms 12, and a plurality of screws 13 corresponding to the plurality of stud mechanisms 12. The plurality of stud mechanisms 12 are fixed to the bottom plate 11 by snapping. The screw 13 cooperates with the stud mechanism 12 to fix a circuit board 14 to the bottom plate 11.

The bottom plate 11 is a thin plate material which can be made of a thin iron plate, a thin plastic plate or a plate made of other materials. In the liquid crystal display device, the bottom plate 11 is a mask cover bottom plate of a liquid crystal display device, which is a thin iron plate. A plurality of heat dissipation holes 111 are disposed in the center of the bottom plate 11. The plurality of heat dissipation holes 111 are arranged in a matrix in the center of the bottom plate 11. In order to achieve the purpose of blocking electromagnetic waves, the diameter of each of the heat dissipation holes 111 should be less than 5 mm. A plurality of fixing holes 112 are distributed in the bottom plate 11, and the fixing holes 112 are convex polygonal through holes. Preferably, the fixing hole 112 is a regular polygonal through hole, in particular a regular triangular shape, a regular square shape or a regular hexagonal through hole.

Please refer to FIG. 3 , which is a perspective enlarged view of the stud mechanism 12 shown in FIG. 1 . The stud mechanism 12 is fixed to the bottom plate 11 by the fixing hole 112. The material of the stud mechanism 12 is preferably plastic or other elastic material. The stud mechanism 12 includes a fixing portion 121 and is disposed on the fixing portion 121 A stud body 122. The fixing portion 121 includes a base 123 , a plate 124 , and a plurality of elastic abutting pieces 125 . The base 123 has a right prism shape. The cross-sectional profile of the base 123 matches the fixing hole 112. Then, the cross-sectional profile of the base 123 is a convex polygonal through hole corresponding to the fixing hole 112. Preferably, it is a regular polygonal through hole, in particular a regular triangular, square or regular hexagonal through hole. The resisting plate 124 is disposed on a bottom surface of the base 123. The plate 124 includes a first abutment surface 129. The plurality of elastic tabs 125 are evenly distributed on the side of the base 123. The resilient tab 125 projects the cross-sectional profile of the base 123. The plurality of resilient tabs 125 define a second abutment surface 126 with respect to one of the faces of the abutment plate 124. The second abutting surface 126 is opposite to the first abutting surface 129 of the abutting plate 124. The other bottom surface of the base 123 is the top surface of the base 123. The stud body 122 is vertically disposed on the top surface. The stud body 122 has a stud hole 127. The stud hole 127 has an internal thread or no internal thread.

The screw 13 can be a general fixing screw or a self-tapping screw. When the stud hole 127 of the stud body 122 is a stud hole having an internal thread, the screw 13 can be a general fixing screw; when the stud hole 127 does not have an internal thread, the screw 13 is a self-tapping screw.

The circuit board 14 includes a plurality of perforations 141. The plurality of through holes 141 respectively correspond to the plurality of fixing holes 112 of the bottom plate 11.

Please refer to Figure 1 and Figure 2 again. The assembling process of the circuit board fixing structure 1 is: first, the stud mechanism 12 is inserted into the fixing hole 112 of the bottom plate 11 from one end of the stud body 122, and the plurality of elastic abutting pieces 125 are pressed by the fixing hole 112. The elastic deformation is caused to make the base 123 and the elastic abutting piece 125 pass through the fixing hole 112 , and the resisting plate 124 is located on the two sides of the bottom plate 11 and the elastic abutting piece 125 respectively because the fixing plate 112 cannot pass through the fixing hole 112 . Moreover, since the pressure received by the elastic abutting piece 125 after the elastic hole piece 125 passes through the fixing hole 112 is removed, the second abutting surface 126 of the elastic abutting piece 125 is in contact with the surface of the bottom plate 11 and The first abutting surface 129 of the plate 124 cooperates to clamp the bottom plate 11 such that the stud mechanism 12 Fixed to the bottom plate 11 to prevent the stud mechanism 12 from coming off the bottom plate 11. The shape of the fixing hole 112 matches the base 123 of the stud mechanism 12 to prevent the rotation of the stud mechanism 12 relative to the vertical axis of the bottom plate 11. Next, the circuit board 14 is placed on the bottom plate 11, and the through holes 141 of the circuit board 14 correspond to the stud holes 127 of the stud mechanism 12. Then, the plurality of screws 13 are screwed into the plurality of stud holes 127 to lock the circuit board 14 to the bottom plate 11.

Compared with the prior art, in the circuit board fixing structure 1 of the present invention, the stud mechanism 12 cooperates with the elastic abutting plate 125 to clamp the bottom plate 11 , and the base 123 and the fixing hole of the stud mechanism 12 . The matching of the stud mechanism 12 into the fixing hole 112 of the bottom plate 11 allows the stud mechanism 12 and the bottom plate 11 to be fixed to each other. It can reduce the process of riveting studs in the prior art, reduce the use of riveting equipment, improve work operability, reduce labor intensity, and thus reduce production cycle and product cost. Moreover, the material of the stud mechanism 12 is plastic, and since the price of the plastic is relatively low, the manufacturing cost of the circuit board fixing structure 1 of the present invention can be made low.

Please refer to FIG. 4 , which is a perspective enlarged view of the stud mechanism of the second embodiment of the circuit board fixing structure of the present invention. The circuit board fixing structure of the second embodiment is substantially the same as the circuit board fixing structure of the first embodiment, and the difference is that the fixing portion 221 of the stud mechanism 22 does not have a plate. The elastic abutting piece 225 of the fixing portion 221 includes an engaging protrusion 228. The engaging projection 228 is provided with a card slot 229. The opposite sides of the slot 229 are defined as a first abutting surface 226 and a second abutting surface 230, respectively. The card slot 229 corresponds to the bottom plate of the circuit board fixing structure (not shown). When the stud mechanism 22 is fixed to the bottom plate, the fixing portion 221 of the stud mechanism 22 is directly pressed into a fixing hole (not shown) of the bottom plate. The card slot 229 is corresponding to the bottom plate of the fixed structure of the circuit board. The first abutting surface 226 and the second abutting surface 230 respectively abut the two surfaces of the bottom plate to clamp the bottom plate to prevent the stud mechanism 22 from coming off the bottom plate. .

Compared with the circuit board fixing structure 1 of the first embodiment, the circuit board fixing structure of the second embodiment prevents the stud mechanism 22 from coming off the bottom plate by the stud mechanism 22 by the card slot 229 of the elastic abutting piece 225. Moreover, there is no such a plate, so when the stud mechanism 22 is fixed to the bottom plate, the stud mechanism 22 is not required to pass through the fixing hole from one end of the stud body, so that the assembly of the circuit board fixing structure is simpler. .

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

1‧‧‧Circuit board fixing structure

11‧‧‧floor

111‧‧‧ vents

112‧‧‧Fixed holes

12. 22‧‧‧ Stud mechanism

121, 221‧‧ ‧ fixed department

122‧‧‧ Stud body

123‧‧‧Base

124‧‧‧

125, 225‧‧‧ elastic sheet

126, 226‧‧‧ second contact surface

127‧‧‧ Stud hole

129, 230‧‧‧ first contact

13‧‧‧ screws

14‧‧‧ boards

141‧‧‧Perforation

229‧‧‧ card slot

228‧‧‧Clamping platform

1 is a perspective exploded view of a first embodiment of a circuit board fixing structure of the present invention.

FIG. 2 is a perspective view showing the assembled structure of the circuit board shown in FIG.

3 is a perspective enlarged view of the stud mechanism shown in FIG. 1.

4 is a perspective enlarged view of the stud mechanism of the second embodiment of the circuit board fixing structure of the present invention.

1‧‧‧Circuit board fixing structure

11‧‧‧floor

111‧‧‧ vents

112‧‧‧Fixed holes

12‧‧‧ Stud mechanism

13‧‧‧ screws

14‧‧‧ boards

141‧‧‧Perforation

Claims (5)

A circuit board fixing structure comprising: a bottom plate; and at least one stud mechanism, wherein the at least one stud mechanism is fixed to the bottom plate, the at least one stud mechanism further comprising a stud body, the stud body including a stud a stud hole having an internal thread; wherein the bottom plate includes at least one fixing hole corresponding to the stud mechanism and at least one screw, each stud mechanism includes a base, the base is in the shape of a right prism, and the cross section of the base The contour shape is a convex polygon, and the cross-sectional contour shape of the base is matched with the shape of the fixing hole to prevent the stud mechanism from rotating relative to the bottom plate. The prism-shaped base comprises a plurality of sides, and each side extends an elastic abutting piece. The elastic abutting piece includes a locking protrusion, the engaging protrusion is provided with a card slot, and the card slot is divided into two upper and lower symmetrical portions, and the card slot is located at a bottom side of the circuit board fixing structure. And having two opposite sides respectively defined as a first abutting surface and a second abutting surface having the same area, and when the stud mechanism fixes the bottom plate of the circuit board, the stud mechanism is pressed into the bottom plate In the hole, the first abutting surface and the second abutting surface of the card slot respectively abut the two surfaces of the bottom plate of the circuit board to hold the bottom plate of the circuit board, the two surfaces of the circuit board and the first abutting surface and the The second abutting surfaces are parallel to each other, and the at least one screw corresponds to the at least one stud mechanism, wherein the screw is a self-tapping screw corresponding to the stud hole; wherein the elastic abutting plate faces the bottom plate of the circuit board The surface is extended so that one end of the elastic abutment abuts against the upper surface of the bottom plate. The circuit board fixing structure according to claim 1, wherein the cross-sectional contour shape of the base is a regular polygon. The circuit board fixing structure according to claim 2, wherein the base has a cross-sectional contour shape of an equilateral triangle, a square or a regular hexagon. The circuit board fixing structure according to any one of claims 2 to 3, wherein the material of the stud mechanism is plastic. A circuit board fixing structure comprising: a bottom plate; and at least one stud mechanism, wherein the at least one stud mechanism is fixed to the bottom plate, the at least one stud mechanism further comprising a stud body, the stud body comprising a The stud hole of the internal thread; wherein the bottom plate comprises at least one fixing hole corresponding to the stud mechanism and at least one screw, each stud mechanism comprises a base, the base has a right prism shape, and the cross section of the base The shape is a convex polygon, and the cross-sectional contour shape of the base is matched with the shape of the fixing hole to prevent the stud mechanism from rotating relative to the bottom plate. The prism-shaped base comprises a plurality of sides, each side extending an elastic abutting piece. The elastic abutting piece includes a locking protrusion, the engaging protrusion is provided with a card slot, and the card slot is divided into two parts which are vertically symmetric, the card slot is located at the bottom side of the circuit board fixing structure, and The two opposite sides are respectively defined as a first abutting surface and a second abutting surface having the same area. When the stud mechanism fixes the bottom plate of the circuit board, the stud mechanism is pressed into the bottom plate. The first abutting surface and the second abutting surface of the card slot respectively abut the two surfaces of the bottom plate of the circuit board to hold the bottom plate of the circuit board, the two surfaces of the circuit board and the first abutting surface and the first The two abutting surfaces are parallel to each other, and the at least one screw corresponds to the at least one stud mechanism, and the stud hole cooperates with the at least one screw; wherein the elastic abutting piece faces the upper surface of the bottom plate of the circuit board Extending so that one end of the elastic abutment abuts against the upper surface of the bottom plate.