JP2018148043A - Printed wiring board and television device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed wiring board reinforced in connection between printed wiring boards disposed with through holes interposed therebetween when the printed wiring board is used without being separated along the through holes and a television equipped with the same.SOLUTION: A printed wiring board 1 is configured that a part of an area can be separated along the through holes 4. A metal foil 5 is attached to an inside of the through hole 4, and solder 6 fills inside of the through hole 4. For example, a part of the printed wiring board 1 is used as a main board 2 of a television device 10, and another part of the printed wiring board 1 is used as an operation board 3 of the television device 10.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a printed wiring board and a television apparatus, and more particularly, to a printed wiring board in which a part of the region can be separated along a through hole and a television apparatus on which the printed wiring board is mounted.

  The printed circuit board is formed with wiring (circuit) patterns on the board body, through holes for component mounting, and through holes that do not mount components (also called “via holes” or “via holes”), and are soldered. The front and back surfaces of the unnecessary portions are covered with a solder resist. Further, a soldered portion (called “land”) is made of a conductive material such as copper foil, and a through hole may be formed inside the portion.

  In addition, separable printed wiring boards are used to manufacture a plurality of printed wiring boards of a predetermined size to be mounted on an electronic device such as a liquid crystal display device. For example, a perforation that is a substantially circular through hole is provided in the printed wiring board, and a part of the printed wiring board can be separated along the perforation.

  When separating printed wiring boards along the perforation, this is a technology that tends to cause burrs and pattern chipping on the separation surface, and suppresses cracks, chipping, and delamination (delamination) from the separation surface to the inside of the printed wiring board. Patent Document 1 discloses a printed wiring board (printed wiring board) in which a copper foil pattern is left in the vicinity of the perforation.

  This printed wiring board is divided from the portion where the copper foil pattern is not left on the surface by leaving the copper foil pattern on one or both sides of the surface of the printed wiring board separated by a plurality of perforations. When the printed wiring board is divided, there is no copper foil pattern with weak base material strength, and it is possible to divide at the shortest gap part of the perforation hole. This is to prevent defects.

Japanese Patent Laid-Open No. 03-171688

  On the other hand, in the television device, the operation unit can be arranged at various positions such as a front surface, a side surface, and a back surface of the television device. When the operation unit is disposed substantially on the rear surface of the television device, a part of the printed wiring board that realizes the operation unit (hereinafter referred to as “operation board”) is separated from the main board that constitutes the printed wiring board. It is used without being. In such a case, the operation board is electrically connected to the main board, and a switch mechanism or the like is provided on the operation board and receives a certain external force. In terms of surface, it is necessary to be firmly connected.

  However, the printed wiring board described in Patent Document 1 is premised on separation along the perforation, and when the printed wiring board is used without being separated, the connection strength is lowered due to the perforation portion. Therefore, it does not disclose anything about preventing warping or bending that may occur in the printed wiring board. In particular, when a switch mechanism, a jack terminal, or the like is provided on a part of the separable printed wiring board, when the external force is applied to the part and the printed wiring board is warped or bent, the switch mechanism and the switch mechanism are There is a possibility that the switch mechanism cannot perform the function of the original switch, or when the jack is inserted into the jack terminal, the printed wiring board may be distorted and chipped due to the twisting.

  The present invention has been made in view of the above situation, and when a printed wiring board is used without being separated along a through hole such as a perforation, the present invention is arranged with the through hole interposed therebetween. It is an object of the present invention to provide a printed wiring board in which the connection between the printed wiring boards is reinforced, and a television device on which the printed wiring board is mounted.

  In order to solve the above-mentioned problem, the first technical means of the present invention is a printed wiring board in which a part of the region can be separated along the through hole, and a metal foil is attached to the inside of the through hole, The inside of the through hole is filled with solder.

  A second technical means is the same as the first technical means, characterized in that it has a plurality of the through holes, and each end of the jumper member is inserted into the two through holes.

  According to a third technical means, in the second technical means, when the jumper member straddles other through holes other than the two through holes, the jumper member is fixed to the solder filled in the other through holes. It is characterized by being.

  According to a fourth technical means, in any one of the first to third technical means, a pad is provided on one and the other printed wiring boards across the through hole, and a T-shaped jumper member is provided in the through hole. Leg portions are inserted, and each arm portion of the T-shaped jumper member is electrically connected to each pad.

  A fifth technical means is any one of the first to fourth technical means, wherein one and the other of the printed wiring boards are a main board and an operation board of a television device, respectively. is there.

  A sixth technical means is a television apparatus according to any one of the first to fifth technical means, on which a printed wiring board is mounted.

  According to the present invention, when the printed wiring board is used without being separated along the through hole, the printed wiring board in which the connection between the printed wiring boards arranged across the through hole is reinforced, and the printed wiring A television device mounted with a substrate can be provided.

It is a figure for demonstrating the example of the printed wiring board which concerns on one Embodiment of this invention. It is sectional drawing along the through-hole of the printed wiring board shown to FIG. 1A. It is a figure for demonstrating the example of the printed wiring board which concerns on other embodiment of this invention. It is sectional drawing along the through-hole of the printed wiring board shown to FIG. 2A. It is a figure for demonstrating the example of the printed wiring board which concerns on further another embodiment of this invention. It is sectional drawing which connects the through-hole of a printed wiring board shown to FIG. 3A, and each pad. It is a figure for demonstrating an example of the television apparatus carrying a printed wiring board.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a printed wiring board and a television device according to the invention will be described with reference to the drawings. In the following description, members denoted by the same reference numerals may be the same in different drawings, and the description thereof may be omitted.

(First embodiment)
FIG. 1A is a view for explaining an example of a printed wiring board 1 according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view along the through hole 4 of the printed wiring board 1 shown in FIG. 1A. . The printed wiring board 1 has a metal foil wiring pattern printed and fixed in a single layer or a multilayer on the surface of the electrically insulating substrate or inside thereof, and an electronic component such as an IC (integrated circuit) chip on the wiring pattern. Is configured to implement. When a wiring pattern (not shown) is formed on both surfaces of the printed wiring board 1 or formed in multiple layers, a through hole penetrating the substrate is formed to connect the wiring patterns between both surfaces or between the layers.

  Examples of the material of the printed wiring board 1 include a paper base epoxy resin, a glass cloth base epoxy resin, a paper base phenol resin, a polyimide resin, a polyester resin, Teflon (registered trademark), and a BT resin. It is done. In addition to the above-described wiring patterns and through-holes omitted in FIG. 1A, the actual substrate is subjected to surface insulation processing (resist processing), silk printing of part numbers and parts names, and mechanical processing. It has been subjected.

  The through hole 4 refers to a hole that connects the front surface and the back surface of the printed wiring board 1, and includes a perforation 4a, a slit 4b in which the perforation 4a extends along the separation surface, and a part of the slit 4b is a printed wiring board. 1 includes all of the slits 4c that are in contact with the outer periphery of 1. Further, the perforation 4a may be formed in, for example, an elliptical shape or a polygonal shape other than the substantially circular shape shown in the figure. These through holes 4 are formed by machining or laser processing using a drill, a router, or the like, but may be formed by press punching.

  The printed wiring board 1 is divided into a main board 2 which is a relatively large area and an operation board 3 which is a small area with the through hole 4 interposed therebetween. However, it does not indicate that the application to be used is limited by the difference in the size of the substrate.

  As shown in FIG. 1B, in the printed wiring board 1, perforations 4a are provided on both sides of the slit 4b and the slit 4b with a certain interval therebetween. A metal foil 5 is attached to the inside of the perforation 4a and the slit 4b, and a so-called through-hole plating process is performed. As the metal foil 5, a copper foil or the like is used.

  As the through-hole plating processing, there are an additive method in which electroless copper plating is applied only to a necessary portion, and a subtractive method in which an unnecessary portion is removed by etching from a substrate having a copper foil stretched over the entire surface. In addition, the additive method includes a full additive method in which thick plating is performed only by electroless copper plating, and a semi-additive method in which resist printing and electrolytic plating are combined. The metal foil 5 is formed by any of the above processes. May be.

  Solder 6 is filled in the perforations 4a and the slits 4b. First, after filling the through holes 4 with the solder 6, electronic components can be mounted on the printed wiring board 1. As the solder 6, for example, cream solder mainly composed of tin, lead and copper can be used. Moreover, you may use the lead free solder etc. which have tin, silver, copper, etc. as a main component. When using cream solder, first, cream solder is applied to the surface side of the printed wiring board 1 with respect to the perforations 4a and the slits 4b. The filling of the through holes 4 with the solder 6 can be performed simultaneously with the mounting of electronic components on the printed wiring board 1.

  For example, by melting the cream solder in the reflow process, the cream solder is filled into the perforations 4a and the slits 4b. The reflow process is performed by placing cream solder on the printed wiring board 1, mounting components (surface-mounted components) on the printed wiring board 1, and heating the printed wiring board 1 in a reflow furnace. The metal foil 5 is also attached to the inside of the slit 4c, and the solder 6 is also filled into the slit 4c, thereby further strengthening the connection of the printed wiring board 1 with the separation surface interposed therebetween. . In addition, in order to fill the through hole 4 with the solder 6, a flow method may be used instead of the above reflow process.

(Second Embodiment)
2A is a view for explaining an example of a printed wiring board 1 according to another embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along the through hole 4 of the printed wiring board 1 shown in FIG. 2A. is there. The configuration related to the printed wiring board 1 is the same as the configuration shown in FIGS. 1A and 1B, but each of the jumper members 7 is provided on the perforation 4a provided at a certain interval on both sides of the slit 4b. The end is inserted.

  As shown in FIG. 2B, in the printed wiring board 1, both ends (supporting portions) of the U-shaped jumper member 7 are inserted into a pair of perforations 4a and fixed with solder 6 filled in the perforations 4a. Has been. And the middle (connecting part) of the jumper member 7 straddles the slit 4b located between the perforations 4a, and is fixed by the solder 6 filled in the slit 4b. The jumper member 7 is disposed in the longitudinal direction of the slit 4b substantially parallel to the slit 4b, and is fixed in a wide range by the solder 6 filled in the perforation 4a and the slit 4b, and the printed wiring board 1 with the separation surface interposed therebetween. The connection is further strengthened.

  2A and 2B, the jumper member 7 is shown as a thin line. However, the jumper member 7 may have a shape having a certain width in the width direction of the slit 4b so that fixing by the solder 6 is not hindered. . Alternatively, each end portion of the jumper member 7 may be inserted into the two perforations 4a, and the jumper member 7 may be fixed only by the solder 6 filled in the perforations 4a.

(Third embodiment)
FIG. 3A is a view for explaining an example of a printed wiring board 1 according to still another embodiment of the present invention, and FIG. 3B shows the through holes 4 and the pads 8 of the printed wiring board 1 shown in FIG. 3A. FIG. The main board 2 and the operation board 3 are originally used separately, but when used together, wiring for signal transmission between them is required. For this reason, in this embodiment, the pads 8 are provided on both sides of the through-hole 4, and these pads 8 are connected by a T-shaped jumper member 9.

  The through hole 4 into which the T-shaped jumper member 9 is inserted is preferably formed as a perforation 4a as shown in FIGS. 3A and 3B. The pads 8 are electrically connected to the wiring pattern 8a, and a plurality of pads 8 are provided at opposing positions on the main board 2 and the operation board 3 constituting the printed wiring board 1 with the perforation 4a interposed therebetween. The T-shaped jumper member 9 made of a conductive material is inserted into the perforation 4a and contacts the pads 8 to electrically connect the pads 8 to each other. The pair of other through holes 4 provided along the separation surface at a certain distance from the perforation 4a are formed in a slit shape in FIG. 3A, but are formed in a perforation shape. It may be.

  Although the T-shaped jumper member 9 can be rotated around the perforation 4a, the main board 2 and the operation board 3 can be used as different printed circuit boards 1 without changing their wiring patterns. Is realized. That is, according to the model of the electronic device on which the main board 2 and the operation board 3 are mounted, the same board can be used to cope with differences in functions for each model, such as changing the number of switches.

  The T-shaped jumper member 9 includes a pair of arm portions 9a and leg portions 9b extending in a direction perpendicular to the arm portions 9a from a position near the middle of the arm portions 9a. The arm portion 9a is formed in such a length that both ends can contact the pad 8 in a state where the leg portion 9b is inserted into the perforation 4a. Further, the leg portion 9b is inserted into the perforation 4a and penetrates the printed wiring board 1 and is filled in the perforation 4a while the arm portion 9a is in contact with the pad 8 via the solder 6. When fixed by the solder 6, it is preferably formed to have a length enough to be buried in the solder 6 on the back surface of the printed wiring board 1.

  As shown in FIG. 3B, the perforation 4a with the metal foil 5 attached to the inside is filled with the solder 6 in a state in which the legs 9b of the T-shaped jumper member 9 are inserted, and the T-shaped jumper member In the state where each arm portion 9 a of 9 is in contact with each pad 8, the respective pads 8 are electrically connected by being fixed by the solder 6.

(Fourth embodiment)
FIG. 4 is a diagram for explaining an example of the television device 10 on which the printed wiring board 1 is mounted. In this figure, the switch mechanism 11 and the jack terminal 12 are provided on the operation board 3 constituting the printed wiring board 1 shown in FIG. 1A or 2A, and the printed wiring board 1 is built in the television device 10. The situation is shown through the rear surface of the television device 10.

  The operation unit of the television device can be arranged at various positions such as a front surface, a side surface, and a back surface of the television device. The operation part is realized by an operation board 3 constituting the printed wiring board 1, and the operation board 3 is separated from the main board 2 constituting the printed wiring board 1 by the position of the operation part in the television apparatus. used.

  As shown in this figure, when the actual operation unit is arranged on the rear side of the television device 10 and the switch mechanism 11 and the jack terminal 12 of the operation board 3 are located on the rear side of the television device 10, the operation is performed. The substrate 3 is used without being separated from the main substrate 2. In this case, the main board 2 and the operation board 3 are electrically connected on the same board, and the switch mechanism 11 and the jack terminal 12 are provided on the operation board 3, so that the operation board 3 has a certain external force. Therefore, the separation surface of the main board 2 and the operation board 3 needs to be firmly connected.

  According to the present invention, as described above, when the printed wiring board is used without being separated along the through hole, the printed wiring board in which the connection between the printed wiring boards arranged with the through hole interposed therebetween is reinforced. In addition, a television device on which the printed wiring board is mounted can be provided.

DESCRIPTION OF SYMBOLS 1 ... Printed wiring board, 2 ... Main board, 3 ... Operation board, 4 ... Through-hole, 4a ... Perforation, 4b ... Slit, 4c ... Slit, 5 ... Metal foil, 6 ... Solder, 7 ... Jumper member, 8 ... Pads, 8a ... wiring patterns, 9 ... T-shaped jumper members, 9a ... arms, 9b ... legs, 10 ... television device, 11 ... switch mechanism, 12 ... jack terminal.

Claims (6)

A printed wiring board in which a part of the region can be separated along the through hole,
A metal foil is attached to the inside of the through hole,
A printed wiring board, wherein the through hole is filled with solder.   The printed wiring board according to claim 1, wherein the printed wiring board has a plurality of the through holes, and each end of the jumper member is inserted into the two through holes.   The said jumper member is being fixed to the said solder with which the said other through-hole was filled when the said jumper member straddles other through-holes other than the two said through-holes. Printed wiring board. Having pads on one and the other printed wiring boards across the through hole,
4. A leg portion of a T-shaped jumper member is inserted into the through-hole, and each arm portion of the T-shaped jumper member is electrically connected to each pad. A printed wiring board according to claim 1.   5. The printed wiring board according to claim 1, wherein one and the other of the printed wiring boards are a main board and an operation board of a television device, respectively. A television device comprising the printed wiring board according to claim 1.

Images