TW201309109A - Circuit board structure and manufacturing method thereof - Google Patents

Abstract

A circuit board structure and a manufacturing method thereof. The circuit board structure comprises a circuit board, an electrically connecting point, and a cable. The circuit board includes a surface, a penetrating hole, and a extending hole. The penetrating hole and the extending hole penetrate the circuit board. The extending hole extends from the penetrating hole to an edge of the circuit. The electrically connecting point is disposed on the surface, electrically connects to the circuit board, and is apart a distance from the penetrating hole. The cable includes an end portion, an end-neighboring portion, and a body portion. The end portion is positioned at the end of the cable and electrically connects to the electrically connecting point. The end-neighboring portion is adjacent to the end portion and has a length substantially equal to the distance between the electrically connecting point and the penetrating hole. The body portion is adjacent to the end-neighboring portion. The cable penetrates the circuit through the penetrating hole. The end-neighboring portion is positioned at the surface. An interface point between the end-neighboring portion and the body portion is positioned in the penetrating hole.

Description

Circuit board structure and manufacturing method thereof

This invention relates to a circuit board structure, and more particularly to a circuit board structure using a flexible flat cable (FFC).

In the manufacturing process of a circuit board, an electrical connection between a circuit board and other electronic components is often required. Currently commonly used cables are Flexible Flat Cable (FFC). Such a soft flat cable can be adapted to various design changes of the circuit board structure due to its soft physical properties. However, when the circuit board structure is processed or processed, the electrical connection point between the cable and the circuit board is also soft and the cable is easily broken or peeled off.

Therefore, in order to prevent electrical contact failure caused by breakage or fall-off of the electrical connection point between the cable and the circuit board, the film is often attached with a film such as the registered trademark Mylar at the electrical connection point to increase the electrical property. The strength of the connection point. However, this practice will increase the cost of the board structure. In addition, the film may deteriorate due to the increase in ambient temperature, which in turn affects the strength of the electrical connection points. As a result, the production cost of the circuit board structure is increased, which is disadvantageous for the profit and sales of the electronic device using the circuit board structure.

The present invention relates to a circuit board structure, and more particularly to a circuit board structure using a flexible flat cable (FFC), and the structure utilizes buffering of a through hole of a circuit board to prevent a soft flat cable and a circuit board. Damage between electrical connection points.

According to an aspect of the invention, a circuit board structure is proposed, including a circuit board, electrical connection points, and cables. The circuit board has a surface, a through hole, and an extending hole. The through hole and the extended hole penetrate the circuit board. The extension holes extend from the through holes to the edges of the board. The electrical connection point is disposed on the surface of the circuit board and electrically connected to the circuit board and at a distance from the through hole. The cable has an end portion, an adjacent end portion, and a body portion. The end is located at the end of the cable and is electrically connected to the electrical connection point. The adjacent end portion is adjacent to the end portion and has an adjacent end portion length substantially the same as the distance between the electrical connection point and the through hole. The body portion is adjacent to the adjacent end portion. The cable penetrates the circuit board through the through hole. The adjacent end is located on the surface of the board. The intersection of the adjacent end portion and the main body portion is located in the through hole.

According to an aspect of the invention, a method of fabricating a circuit board structure is provided, comprising the following steps. A circuit board having electrical connection points, through holes, and extension holes is prepared. The through hole is spaced apart from the electrical connection point, and the through hole and the extended hole penetrate the circuit board, and the extension hole extends from the through hole to the edge of the circuit board. Electrically connecting the cable to the end of the cable to the electrical connection point, wherein the cable has an adjacent end portion and a body portion, the adjacent end portion is adjacent to the end portion and has an electrical connection point and a through hole The distance between the adjacent ends is substantially the same, and the body portion is adjacent to the adjacent end. The main body portion is laterally moved from the edge of the circuit board to the through hole via the extending hole. The main body portion is pulled so that the intersection of the adjacent end portion and the main body portion is located in the through hole.

In order to provide a better understanding of the above and other aspects of the present invention, the following detailed description of the embodiments and the accompanying drawings

Referring to FIG. 1, a perspective view of a circuit board structure 10 in accordance with an embodiment of the present invention is shown. The circuit board structure 10 includes a circuit board 110, electrical connection points 120, and cables 130. The circuit board 110 has a surface 111, a through hole 112, and an extending hole 113. The through hole 112 and the extending hole 113 penetrate the circuit board 110. The extension hole 113 extends from the through hole 112 to the edge 110a of the circuit board 110. The electrical connection point 120 is disposed on the surface 111 of the circuit board 110 and electrically connected to the circuit board 110 and at a distance D from the through hole 112. The cable 130 has an end portion 131, an adjacent end portion 132, and a body portion 133. The end 131 is located at the end of the cable 130 and is electrically connected to the electrical connection point 120. The adjacent end portion 132 is adjacent to the end portion 131 and has an adjacent end portion length L. The distance D between the electrical connection point 120 and the through hole 112 is substantially the same as the length L of the adjacent end portion. The body portion 133 is adjacent to the adjacent end portion 132. The cable 130 penetrates the circuit board 110 through the through hole 112, and the adjacent end portion 132 is located on the surface 111 of the circuit board 110. The intersection of the adjacent end portion 132 and the main body portion 133 is located in the through hole 112 and penetrates the circuit board 110.

In general, during other processing of the board structure, the cable is pulled, and the electrical connection points are easily damaged by pulling. However, in the present embodiment, since the cable 130 penetrates the circuit board 110 through the through hole 112, when the main body portion 133 of the cable 130 is pulled, the cable 130 abuts against a portion of the side wall of the through hole 112, thereby increasing The frictional force of the cable 130 and the through hole 112 further buffers the pulling force of the end portion 131 of the cable 130. Therefore, the circuit board structure 10 of the embodiment can prevent the electrical connection point 120 from being damaged by the pulling of the cable 130.

When the circuit board structure 10 of the present embodiment is assembled, the end portion 131 of the cable 130 can be electrically connected to the electrical connection point 120, and the other end portion 134 of the cable 130 can be directly penetrated through the through hole 112, and then pulled. The main body portion 133 is located in the through hole 112 at the intersection of the adjacent end portion 132 and the main body portion 133. In addition, since the extension hole 113 extends from the through hole 112 to the edge 110a of the circuit board 110, when assembling the circuit board structure 10, the end portion 131 of the cable 130 can be electrically connected to the electrical connection point 120 first, and then The main body portion 133 of the cable 130 is laterally moved from the edge 110a of the circuit board 110 to the through hole 112 via the extending hole 113, and the main body portion 133 is pulled and the intersection of the adjacent end portion 132 and the main body portion 133 is penetrated. In the hole 112. When the total length of the cable 130 is too long, or the main body portion 133 of the cable 130 has been bent into other specific shapes in advance, the main body portion 133 is laterally displaced from the edge 110a of the circuit board 110 via the extending hole 113 to The method of the through hole 112 simplifies the assembly flow in which the intersection of the adjacent end portion 132 and the main body portion 133 is provided in the through hole 112.

In the present embodiment, the end portion 131 and the electrical connection point 120 are electrically connected, for example, by solder or the like. The size of the through hole 112 is larger than the sectional size of the cable 130. The cable 130 is a flexible flat cable (FFC) 130, and the flexible flat cable 130 is electrically connected to the electrical connection point 120 by a thermocompression bonding process. Therefore, the through hole 112 can be a flat elongated shape having a long axis direction A. The extension hole 113 extends from the through hole 112 along the long axis direction A to the edge 110a of the circuit board 110. The extension hole 113 has an extension hole width W1. The extension hole width W1 is greater than or equal to the line thickness T of the flexible flat wire 130, and is smaller than the through hole width W2 of the through hole 112. In other embodiments, the extended hole width W1 is equal to the through hole width W2 of the through hole 112.

Since the cable 130 is a soft flat cable 130, various design variations of the circuit board structure 10 can be accommodated due to its soft nature. In addition, since the thermocompression bonding process can be automated, the time interval in which the flexible flat cable 130 is electrically connected to the electrical connection point 120 can be shortened in the fabrication of the circuit board structure 10. When the extension hole width W1 is greater than or equal to the thickness T of the flexible flat cable 130, the flexible flat cable 130 can be laterally displaced from the edge 110a of the circuit board 110 through the extension hole 113 into the through hole 112. When the width W1 of the extending hole is smaller than the width W2 of the through hole 112, the flexible flat wire 130 that is located in the through hole 112 is not easily detached from the extending hole 113, and the lateral direction of the flexible flat wire 130 in the through hole 112 can be maintained. stability. In other embodiments, when the extending hole width W1 is equal to the through hole width W2 of the through hole 112, the through hole 112 and the extending hole 113 can be opened by the same opening tool, and the through hole 112 and the extending hole 113 are simplified. Process.

In addition, please refer to FIGS. 2A to 2D, which are perspective views showing a flow of a manufacturing method of the circuit board structure 10 according to an embodiment of the present invention. As shown in FIG. 2A, a circuit board 110 having electrical connection points 120, through holes 112, and extension holes 113 is prepared. The through hole 112 is spaced apart from the electrical connection point 120 by a distance D. The through hole 112 and the extending hole 113 penetrate the circuit board 110. The extension hole 113 extends from the through hole 112 to the edge 110a of the circuit board 110. As shown in FIG. 2B, the cable 130 is electrically connected to the electrical connection point 120 at the end 131 at the end of the cable 130. The cable 130 has an adjacent end portion 132 and a body portion 133. The adjacent end portion 132 is adjacent to the end portion 131 and has an adjacent end portion length L. The distance D between the electrical connection point 120 and the through hole 112 is substantially the same as the length L of the adjacent end portion. The body portion 133 is adjacent to the adjacent end portion 132. As shown in FIG. 2C, the cable 130 is bent, and the main body portion 133 is laterally displaced from the edge 110a of the circuit board 110 through the extending hole 113 to the through hole 112 until the main body portion is as shown in FIG. 2D. 133 is pushed into the through hole 112. At this time, separated by the circuit board 110, one portion 133a of the main body portion 133 adjacent to the adjacent end portion 132 is located at the same position as the electrical connection point 120, and the other portion 133b of the main body portion 133 is located opposite to the electrical connection point 120. position. Next, the other portion 133b of the main body portion 133 is pulled in the direction B opposite to the electrical connection point 120 until the intersection of the adjacent end portion 132 and the main body portion 133 is located in the through hole 112 as shown in Fig. 1 .

In the present embodiment, since the main body portion 133 of the cable 130 is laterally pushed from the edge 110a of the circuit board 110 to the through hole 112 via the extending hole 113, when the total length of the cable 130 is too long, it is not necessary to The entire cable 130 passes through the through hole 112, and the time course in which the cable 130 is placed in the through hole 112 can be reduced. In addition, when the main body portion 133 of the cable 130 has been bent into another specific shape in advance, the cable 130 can be disposed in the through hole 112 without disassembling the cable 130, thereby simplifying the adjacent end portion 132 and The assembly flow of the main body portion 133 at the intersection of the through holes 112 is provided.

In addition, in the embodiment, the cable 130 can be a flexible flat cable 130, and the flexible flat cable 130 can be electrically connected to the electrical connection point 120 by a thermocompression bonding process. Since the cable 130 is a soft flat cable 130, various design variations of the circuit board structure 10 can be accommodated due to its soft nature. In addition, since the thermocompression bonding process can be automated, the time interval in which the flexible flat cable 130 is electrically connected to the electrical connection point 120 can be shortened in the fabrication of the circuit board structure 10.

The above described embodiments of the present invention relate to a circuit board structure. Since the cable penetrates the circuit board through the through hole, when the cable is pulled, the cable will abut against a part of the side wall of the through hole, thereby increasing the friction between the cable and the through hole, thereby accommodating the end of the cable. The pulling force can prevent the electrical connection point from being damaged by the pulling of the cable. In addition, since the cable can be a soft flat cable, it can be adapted to various design variations of the circuit board structure due to its soft nature. Furthermore, since the hot press welding process between the end portion of the cable and the electrical connection point can be automated, the manufacturing time of the circuit board structure can be shortened. In the above embodiment, when the width of the extending hole is smaller than the width of the through hole of the through hole, the soft flat wire that has been located in the through hole is not easily detached from the extending hole, and the lateral stability of the soft flat wire in the through hole can be maintained. . In other embodiments, when the width of the extending hole is equal to the width of the through hole of the through hole, the through hole and the extending hole can be opened by the same opening tool, and the manufacturing process of the through hole and the extending hole is simplified.

The above embodiments of the present invention relate to a method of fabricating a circuit board structure. Since the cable is laterally pushed from the edge of the circuit board to the through hole through the extending hole, when the total length of the cable is too long, the entire cable does not have to pass through the through hole, and the cable can be reduced. The time period set in the through hole. Further, when the cable has been bent into another specific shape in advance, the cable can be placed in the through hole without disassembling the cable, and the assembly flow for installing the cable in the through hole can be simplified.

In conclusion, the present invention has been disclosed in the above embodiments, but it is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

10. . . Board structure

110. . . Circuit board

110a. . . edge

111. . . surface

112. . . Through hole

113. . . Extended hole

120. . . Electrical connection point

130. . . Cable; soft flat cable

131. . . Ends

132. . . Adjacent end

133. . . Main body

134. . . The other end

A. . . Long axis direction

B. . . direction

D. . . distance

L. . . Adjacent end length

T. . . Cable thickness T

W1. . . Extension hole width

W2. . . Through hole width

1 is a perspective view showing the structure of a circuit board in accordance with an embodiment of the present invention.

2A to 2D are perspective views showing a flow of a method of manufacturing a circuit board structure according to an embodiment of the present invention.

10. . . Board structure

110. . . Circuit board

110a. . . edge

111. . . surface

112. . . Through hole

113. . . Extended hole

120. . . Electrical connection point

130. . . Cable; soft flat cable

131. . . Ends

132. . . Adjacent end

133. . . Main body

134. . . The other end

A. . . Long axis direction

D. . . distance

L. . . Adjacent end length

T. . . Cable thickness T

W1. . . Extension hole width

W2. . . Through hole width

Claims (10)

A circuit board structure comprising: a circuit board having a surface, a through hole and an extending hole, the through hole and the extending hole penetrating the circuit board, the extending hole extending from the through hole to an edge of the circuit board; An electrical connection point is disposed on the surface of the circuit board and electrically connected to the circuit board and spaced apart from the through hole; and a cable having an end portion, an adjacent end portion and a main body portion The end portion is located at the end of the cable and is electrically connected to the electrical connection point. The adjacent end portion is adjacent to the end portion and has substantially the same distance from the electrical connection point and the through hole. An adjacent end portion, the main body portion is adjacent to the adjacent end portion, the cable is penetrated through the circuit board through the through hole, and the adjacent end portion is located on the surface of the circuit board, the adjacent end portion and the main body The intersection of the parts is located in the through hole. The circuit board structure of claim 1, wherein the end portion and the electrical connection point are electrically connected by solder. The circuit board structure of claim 1, wherein the through hole has a size larger than a cross-sectional dimension of the cable. The circuit board structure of claim 1, wherein the cable is a soft flat cable. The circuit board structure of claim 4, wherein the through hole has a flat shape having a long axis direction. The circuit board structure of claim 5, wherein the extension hole extends from the through hole along the long axis direction to an edge of the circuit board. The circuit board structure of claim 4, wherein the extension hole has an extension hole width which is greater than or equal to a thickness of the one of the soft flat wires. The circuit board structure of claim 4, wherein the extension hole has an extension hole width which is less than or equal to a through hole width of the through hole. A method for manufacturing a circuit board structure includes: preparing a circuit board having an electrical connection point, a through hole, and an extension hole, the through hole being spaced apart from the electrical connection point, the through hole and the extension hole Through the circuit board, the extension hole extends from the through hole to the edge of the circuit board; a cable is electrically connected to the electrical connection point at one end of the end of the cable, the cable has a neighbor An end portion and a body portion adjacent to the end portion and having substantially the same length as the distance between the electrical connection point and the through hole, the body portion being adjacent to the end portion An end portion; the main body portion is laterally moved from the edge of the circuit board to the through hole through the extending hole; and the main body portion is pulled to make the intersection of the adjacent end portion and the main body portion In the hole. The method of manufacturing a circuit board structure according to claim 9, wherein the cable is a soft flat cable, and the flexible flat cable is electrically connected to the electrical connection point by a thermocompression bonding process. .