Print circuit board

Abstract

To provide a technique capable of facilitating insertion of a lead into a through hole while preventing the misalignment of components.SOLUTION: Two leads 702 with a flat cross-section are placed in an insertion type component 701 so that the length direction of the cross-section of each lead 702 is in the same direction. A printed wiring board 100 has an oval through hole 402 with a width-direction length obtained by adding a predetermined clearance value to a width-direction length of the lead 702 and a circular through hole 403 with a diametrical length obtained by adding a predetermined clearance value to a length-direction length of the lead 702.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a printed wiring board. [Background technology]

[0002] Electronic components mounted on printed wiring boards are mainly divided into insertion type components and surface mount type components. Insertion type components have wire-shaped electrode terminals called leads, and when mounting insertion type components on a printed wiring board, the leads are inserted into through holes in the printed wiring board by machine or by hand and soldered.

[0003] Leads come in a variety of cross-sectional shapes, including circular, angular, flat, etc. When a lead with a flat cross-section is inserted into a circular through-hole, the shapes of the lead and the through-hole may not match, causing the lead to deform and the component to tilt on the printed wiring board.

[0004] One method to prevent component tilt is to make the shape of the through-hole in the printed wiring board oval to match the flat shape of the lead, but in recent years, electronic components have become increasingly miniaturized, making it difficult to use a drilling device to drill an oval hole of the optimal size for a small, flat lead. If the hole is enlarged to a size that can be drilled with a drilling device, the through-hole will be larger than the lead, resulting in a problem of greater component misalignment.

[0005] Also, as hole processing devices other than drilling devices, router devices and laser devices are possible, but router devices take a long time to process and laser devices are expensive, so both increase costs.

[0006] As a technique for suppressing tilt and misalignment of a printed wiring board, Patent Document 1 discloses a printed wiring board in which a through hole is provided for inserting an external terminal 10 for positioning and a slit is formed around the through hole. By arranging the slits around the through hole, the printed wiring board of Patent Document 1 can suppress tilt and misalignment of the entire printed wiring board by deforming only the base material near the through hole due to the slits being arranged. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-6806 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, in order to prevent tilting and misalignment of components using the technology of Patent Document 1, it is necessary to provide through holes for positioning in the printed wiring board, which increases processing time and costs. In addition, the technology of Patent Document 1 cannot make it easy to insert the leads into the through holes or prevent deformation of the leads.

[0009] Therefore, an object of the present invention is to provide a technique that can facilitate the insertion of leads into through holes and suppress misalignment of components. [Means for solving the problem]

[0010] In order to solve the above problems, one representative printed wiring board of the present invention is a printed wiring board on which a component having at least two leads is mounted, and is provided with at least two holes for inserting the leads respectively, the holes having at least one first hole whose length in one direction is the length of the lead in that direction plus a predetermined clearance value, and at least one second hole whose length in a direction perpendicular to the one direction is the length of the lead in the direction perpendicular to the one direction plus a predetermined clearance value. Effect of the Invention

[0011] According to the present invention, it is possible to facilitate the insertion of leads into through holes and to prevent misalignment of components.

[0012] Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0013] [Figure 1A] 1A and 1B are cross-sectional and top views illustrating a method for processing a circular through-hole in a printed wiring board. [Figure 1B] 1A and 1B are cross-sectional and top views illustrating a method for processing a circular through-hole in a printed wiring board. [Figure 2A] 1A and 1B are cross-sectional and top views illustrating a method for processing an oval through-hole in a printed wiring board. [Figure 2B] 1A and 1B are cross-sectional and top views illustrating a method for processing an oval through-hole in a printed wiring board. [Figure 3A] 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. [Figure 3B] 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. [Figure 3C] 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. [Figure 4A] 1A and 1B are a cross-sectional view and a top view showing an example of inserting a flat lead into a circular through-hole of a size recommended by a manufacturer. [Figure 4B] 1A and 1B are a cross-sectional view and a top view showing an example of inserting a flat lead into a circular through-hole of a size recommended by a manufacturer. [Figure 5A] FIG. 13 is a top view illustrating the size of an oval through hole. [Figure 5B] 1A and 1B are diagrams showing an example of mounting an insertion-type component on a printed wiring board having an oval through hole. [Figure 5C] FIG. 13 is a top view illustrating the size of a circular through hole. [Figure 5D] 1A and 1B are diagrams showing an example of mounting an insertion-type component on a printed wiring board having a circular through hole. [Figure 6] 1A and 1B are a cross-sectional view and a top view showing an example of a printed wiring board according to a first embodiment. [Figure 7] 11A and 11B are a cross-sectional view and a top view showing an example of a printed wiring board according to a second embodiment. [Figure 8] 11A and 11B are a cross-sectional view and a top view showing an example of a printed wiring board according to a third embodiment. [Figure 9] 11A and 11B are a cross-sectional view and a top view showing an example of a printed wiring board according to a fourth embodiment. [Figure 10A] 1A and 1B are cross-sectional and top views showing an example in which a lead having a protrusion shape is inserted into a circular through-hole of a size recommended by a manufacturer. [Figure 10B] 13A and 13B are a cross-sectional view and a top view showing an example of a printed wiring board according to a fifth embodiment. [Figure 11] 13A and 13B are a cross-sectional view and a top view showing an example of a printed wiring board according to a sixth embodiment. [Figure 12] 13A and 13B are a cross-sectional view and a top view showing an example of a printed wiring board according to a seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the embodiments will be described with reference to the drawings.

[0015] The embodiment described below shows one mode for carrying out the present invention, and the present invention is not limited to this embodiment. In addition, the same devices (members or parts) in the following drawings are given the same reference numerals, and in principle, descriptions of devices that have already been described are omitted. In addition, when the number of elements is mentioned in the following embodiment, it is not limited to that specific number, except when the necessity of the number of elements is explained.

[0016] First, a method for processing through holes in a printed wiring board and a method for mounting insertion-type components on a printed wiring board will be described.

[0017] A printed wiring board is a board in which a copper foil pattern (conductor pattern) is formed on the outer surface (surface of the printed wiring board) or inner surface (inside the printed wiring board) of a substrate (insulated board), and is generally made up of through holes for mounting electronic components on the printed wiring board, and signal copper foil patterns for connecting components.

[0018] A through hole is a hole that is drilled into a printed wiring board with a drilling device and the inner wall (base material) of the through hole is copper plated to allow electrical continuity between the outer and inner surfaces. It serves both as an electrical connection and as a fixing hole for components mounted on the printed wiring board.

[0019] Through holes are generally circular or oval in shape. Copper foil patterns called lands are formed around the through holes on the outer or inner surface of the printed wiring board. Lands are always formed on the outer surface of the printed wiring board for soldering.

[0020] 1A and 1B are a cross-sectional view and a top view illustrating a method for processing a circular through-hole in a printed wiring board.

[0021] As shown in FIG. 1A, printed wiring board 100 includes insulating base material 204 called a core material, base materials 203 and 205 having both adhesiveness and insulating properties called prepregs, and copper foils 103, 104, 105, and .

[0022] Copper foils 103 and 104 are attached to both sides of base material 204 in advance. Furthermore, when base material 204 is sandwiched between base materials 203 and 205 and copper foils 105 and 106 are placed on top of it and heated and pressed, base materials 203 and 205 melt and become closely attached to copper foils 103, 104, 105 and 106. This produces a four-layer printed wiring board with two copper foil pattern layers laminated on the inner layer surfaces.

[0023] The processing of the circular through hole 102 in the printed wiring board 100 will now be described.

[0024] First, as shown in FIG. 1A, a circular hole having an inner wall 101 is formed in printed wiring board 100 by drilling using drill device 301.

[0025] Next, as shown in FIG. 1B, copper foil 107 is adhered to inner wall 101 of the hole by copper plating, and circular through-hole 102 is completed.

[0026] 2A and 2B are a cross-sectional view and a top view illustrating a method for processing an oval through-hole in a printed wiring board.

[0027] The processing of the oval through-holes in the printed wiring board 100 will be described.

[0028] First, as shown in FIG. 2A, holes are drilled in a zigzag pattern in printed wiring board 100 using drill device 301, forming oval holes having inner walls 101.

[0029] In the staggered drilling, after drilling circular hole 501a in printed wiring board 100 with drilling device 301, drilling device 301 is moved horizontally as indicated by arrow 601 to drill hole 501b. After that, drilling device 301 is moved horizontally as indicated by arrow 602 to drill hole 501c, drilling device 301 is moved horizontally as indicated by arrow 603 to drill hole 501d, and drilling device 301 is moved horizontally as indicated by arrow 604 to drill hole 501e. In this manner, circular holes 501a-e are overlapped to form an oval hole. Here, the distance traveled by arrows 601 and 602 must be at least the diameter of drilling device 301.

[0030] Next, as shown in FIG. 2B, copper foil 107 is adhered to inner wall 101 of the hole by copper plating, and oval through-hole 401 is completed.

[0031] Next, a method for mounting an insertion-type component on printed wiring board 100 will be described.

[0032] 3A to 3C are cross-sectional views illustrating a method for mounting an insertion-type component on a printed wiring board.

[0033] The insertion type component 701 has leads 702 which are electrode terminals for electrically connecting the insertion type component 701 to the printed wiring board 100 .

[0034] First, as shown in FIG. 3A, a worker recognizes circular through-hole 102 on printed wiring board 100, and manually inserts lead 702 into circular through-hole 102 in the direction of arrow 901 while paying attention to the direction and inclination of the component.

[0035] Lead 702 is inserted into circular through hole 102 from surface A 201 of printed wiring board 100 so that its tip projects out onto surface B 202 .

[0036] Next, as shown in FIG. 3B, insertion type component 701 is soldered to printed wiring board 100 by a flow method.

[0037] The flow method is a method in which printed wiring board 100, into which leads 702 of insertion-type component 701 are inserted, is sent by a conveyer to solder bath 801 and soldered.

[0038] The solder bath 801 is a device that jets out liquid molten solder 802 in the direction of the arrow 803. The solder 802 jetted out from the solder bath 801 comes into contact with the B side 202 of the printed wiring board.

[0039] 3C, the molten solder 802 flows from the B-side 202 side through the circular through-hole 102 to the A-side 201 side, and the space between the circular through-hole 102 and the lead 702 is completely filled with the solder 802. The molten solder 802 hardens, bonding the printed wiring board 100 and the insertion-type component 701 together.

[0040] 4A and 4B are a cross-sectional view and a top view showing an example in which a flat lead is inserted into a circular through-hole of a size recommended by the manufacturer.

[0041] The insertion type component 701 includes two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 such that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

[0042] Printed wiring board 100 has two circular through holes 102 at positions into which two leads 702 of insertion-type component 701 are respectively inserted. The hole diameter size of circular through holes 102 uses the value recommended by the component manufacturer.

[0043] An operator manually inserts two leads 702 of an insertion-type component 701 into circular through-hole 102 of printed wiring board 100 in the direction of arrow 901 .

[0044] At this time, as shown in FIG. 4B, leads 702 may bend within circular through-hole 102, causing insertion-type component 701 to tilt relative to printed wiring board 100.

[0045] This is believed to be because the shape of the circular through hole 102 and the shape of the lead 702 do not match, making insertion difficult.

[0046] Furthermore, in order to prevent misalignment when insertion-type component 701 is mounted on printed wiring board 100, diameter 902 of circular through-hole 102 recommended by the component manufacturer is set to be equal to length 903 of lead 702 in the longitudinal direction, which makes it easy for lead 702 to interfere with circular through-hole 102. Therefore, lead 702 needs to be pressed into circular through-hole 102 with a large force, and lead 702 is prone to bending when pressed.

[0047] An example in which circular through-hole 102 of the size recommended by the manufacturer is changed to oval through-hole 402 that matches the cross-sectional shape of lead 702 in order to prevent tilting of insertion-type component 701 will be described with reference to FIGS. 5A and 5B.

[0048] FIG. 5A is a top view illustrating the size of the oval through-holes.

[0049] Printed wiring board 100 has two oval through holes 402 at positions where two leads 702 of insertion-type component 701 are inserted, respectively.

[0050] The short-side length B' of the oval through-hole 402 is set to the short-side length B of the lead 702 plus the clearance value × 2. The clearance value is set to a value that allows the lead 702 to be easily inserted into the oval through-hole 402 and prevents the lead 702 from shifting in the short-side direction.

[0051] Like the short-side length B', the longitudinal length A' of oval through hole 402 is ideally the longitudinal length A of lead 702 plus the clearance value × 2. However, as described above with reference to Fig. 2A, in order to drill oval through hole 402 in printed wiring board 100, the staggered movement distance of drilling device 301 needs to be at least the diameter of drilling device 301. Therefore, as a constraint value of drilling device 301, the longitudinal length A' of oval through hole 402 is twice the short-side length B' of oval through hole 402, which is larger than the ideal value.

[0052] FIG. 5B is a diagram showing an example in which an insertion-type component is mounted on a printed wiring board having an oval through hole.

[0053] As shown in FIG. 5B, when lead 702 of insertion-type component 701 is inserted into oval through-hole 402, the short-side length B' of oval through-hole 402 is the short-side length B of lead 702 plus clearance value × 2, so that the short-side deviation of lead 702 indicated by arrow 911 is suppressed.

[0054] However, since the gap 410 between the longitudinal direction of the oval through hole 402 and the longitudinal direction of the lead 702 becomes too large as a clearance value, misalignment in the longitudinal direction of the lead 702 as indicated by the arrow 910 is likely to occur.

[0055] An example in which a circular through hole of a size larger than the circular through hole 102 recommended by the manufacturer is used to prevent the insertion-type component 701 from tilting will be described with reference to FIGS. 5C and 5D.

[0056] FIG. 5C is a top view illustrating the size of the circular through-holes.

[0057] Printed wiring board 100 has two circular through holes 403 at positions where two leads 702 of insertion-type component 701 are inserted, respectively.

[0058] The diameter A' of the circular through hole 403 is set to the longitudinal length A of the lead 702 plus twice the clearance value.

[0059] FIG. 5D is a diagram showing an example of mounting an insertion-type component on a printed wiring board having a circular through hole.

[0060] As shown in FIG. 5D, when lead 702 of insertion-type component 701 is inserted into circular through hole 403, diameter A' of circular through hole 403 is the longitudinal length A of lead 702 plus clearance value × 2, so that the longitudinal deviation of lead 702 indicated by arrow 910 is suppressed.

[0061] However, gap 412 in the short-side direction between circular through-hole 403 and lead 702 becomes excessively large as a clearance value, and therefore misalignment in the short-side direction of lead 702, as indicated by arrow 911, becomes likely to occur. EXAMPLES

[0062] The printed wiring board of the first embodiment will be described with reference to FIG.

[0063] The first embodiment is a printed wiring board in which an oval through hole 402 and a circular through hole 403 are combined.

[0064] FIG. 6 is a cross-sectional view and a top view showing an example of the printed wiring board of the first embodiment.

[0065] The insertion type component 701 includes two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 such that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

[0066] Printed wiring board 100 has oval through hole 402 and circular through hole 102 at positions where two leads 702 of insertion-type component 701 are inserted, respectively.

[0067] By combining the oval through hole 402 and the circular through hole 403, the oval through hole 402 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the circular through hole 403 suppresses the misalignment of the lead 702 in the long direction indicated by the arrow 910, thereby suppressing the positional misalignment of the insertion-type component 701.

[0068] Moreover, the oval through hole 402 and the circular through hole 403 are formed to a size that provides clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

[0069] In this embodiment, a flat cross-sectional shape of the lead 702 is taken as an example, but this embodiment can be applied to any lead shape such as a wave shape or an oval shape.

[0070] In addition, in this embodiment, a combination of oval and circular through holes is given as an example, but any combination of through holes of any shape may be used as long as the combination is of a shape that can be expected to prevent misalignment according to the lead shape.

[0071] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0072] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as circles, but the lands may be of any shape.

[0073] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0074] According to the first embodiment, it is possible to facilitate the insertion of the leads into the through holes and to prevent misalignment of the components.

[0075] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0076] The printed wiring board of the second embodiment will be described with reference to FIG.

[0077] The second embodiment is an example in which an insertion-type component 701 having four leads 702 arranged in a row is mounted on a printed wiring board 100. In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0078] FIG. 7 is a cross-sectional view and a top view showing an example of a printed wiring board according to a second embodiment.

[0079] The insertion type component 701 has four leads 702 arranged in a row. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal direction of the cross section of each lead 702 is in the same direction.

[0080] Printed wiring board 100 has oval through holes 402 at positions where leads 702 on both ends of insertion-type component 701 are inserted, and has circular through holes 403 at positions where the other leads 702 are inserted.

[0081] By combining the oval through hole 402 and the circular through hole 403, the oval through hole 402 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the circular through hole 403 suppresses the misalignment of the lead 702 in the long direction indicated by the arrow 910, thereby suppressing the positional misalignment of the insertion-type component 701.

[0082] Moreover, the oval through hole 402 and the circular through hole 403 are formed to a size that provides clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

[0083] In this embodiment, both ends are oval through holes 402 and the others are circular through holes 403, but the order in which the oval and circular through holes are arranged is not limited to this, and any combination of oval and circular through holes may be used.

[0084] In addition, in this embodiment, an insertion-type component 701 having four leads 702 arranged in a row is given as an example, but the number and arrangement of the leads are not limited to this, and the insertion-type component may have multiple rows of leads. In addition, in this embodiment, a flat shape is given as an example of the cross-sectional shape of the leads 702, but this embodiment can be applied to any lead shape, such as a wave shape or an oval shape.

[0085] In addition, in this embodiment, a combination of oval and circular through holes is given as an example, but any combination of through holes of any shape may be used as long as the combination is of a shape that can be expected to prevent misalignment according to the lead shape.

[0086] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0087] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as circles, but the lands may be of any shape.

[0088] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0089] According to the second embodiment, it is possible to facilitate the insertion of the leads into the through holes and to prevent the components from being misaligned.

[0090] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0091] The printed wiring board of the third embodiment will be described with reference to FIG.

[0092] The third embodiment is an example in which a plurality of insertion-type components 701 are mounted on a plurality of printed wiring boards 100. In the third embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0093] FIG. 8 is a cross-sectional view and a top view showing an example of a printed wiring board according to a third embodiment.

[0094] The two insertion type components 701a, 701b each have two leads 702 on the top and bottom. The leads 702 have a flat cross section and are arranged in the insertion type components 701a, 701b so that the longitudinal direction of the cross section of each lead 702 is in the same direction. The two insertion type components 701a, 701b are mounted side by side on the two printed wiring boards 100a, 100b so that the two leads 702 on the top and bottom of each component are aligned in a row.

[0095] The two printed wiring boards 100a, 100b are provided with oval through holes 402 at positions where the leads 702 that are at both ends when the insertion-type components 701a, 701b are arranged are inserted, and with circular through holes 403 at positions where the other leads 702 are inserted.

[0096] Each of insertion type components 701a and 701b is connected to printed wiring board 100a by two leads 702 provided on the upper side, and is connected to printed wiring board 100b by two leads 702 provided on the lower side.

[0097] By combining the oval through hole 402 and the circular through hole 403, the oval through hole 402 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the circular through hole 403 suppresses the misalignment of the lead 702 in the long direction indicated by the arrow 910, thereby suppressing the positional misalignment of the insertion type components 701a, 701b.

[0098] Moreover, the oval through hole 402 and the circular through hole 403 are formed to a size that provides clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

[0099] In this embodiment, both ends are oval through holes 402 and the others are circular through holes 403, but the order in which the oval and circular through holes are arranged is not limited to this, and any combination of oval and circular through holes may be used.

[0100] In addition, in this embodiment, insertion type components 701a, 701b having leads 702 arranged in pairs above and below each other are given as an example, but the number and arrangement of the leads are not limited to this, and the insertion type components may have multiple rows of leads.

[0101] In addition, in this embodiment, a flat cross-sectional shape of the lead 702 is taken as an example, but this embodiment can be applied to any lead shape such as a wave shape or an oval shape.

[0102] In addition, in this embodiment, a combination of oval and circular through holes is given as an example, but any combination of through holes of any shape may be used as long as the combination is of a shape that can be expected to prevent misalignment according to the lead shape.

[0103] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0104] In this embodiment, the lands on the outer surface of the printed wiring boards 100a and 100b are depicted as circles, but the lands may be of any shape.

[0105] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0106] According to the third embodiment, it is possible to facilitate the insertion of the leads into the through holes and to prevent the components from being misaligned.

[0107] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0108] The printed wiring board of the fourth embodiment will be described with reference to FIG.

[0109] The fourth embodiment is an example in which an insertion type component 701 is mounted on an end portion of a printed wiring board 100. In the fourth embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0110] FIG. 9 is a cross-sectional view and a top view showing an example of a printed wiring board according to a fourth embodiment.

[0111] The insertion type component 701 includes two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 such that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

[0112] Printed wiring board 100 has through holes 404, 405 at positions where leads 702 of insertion-type component 701 are inserted, respectively.

[0113] Through holes 404, 405 are formed by cutting out an end of printed wiring board 100 in a U-shape. Through hole 404 is a roughly ellipse whose short-side length is the short-side length of lead 702 + clearance value x 2. Through hole 405 is a roughly circular shape whose diameter is the long-side length of lead 702 + clearance value x 2.

[0114] By combining through hole 404 and through hole 405, through hole 404 suppresses the misalignment of lead 702 in the short direction indicated by arrow 911, and through hole 405 suppresses the misalignment of lead 702 in the long direction indicated by arrow 910, thereby suppressing positional misalignment of insertion type component 701.

[0115] Furthermore, since the through holes 404, 405 are formed to have a size that provides clearance for the lengths of the leads 702 in the short and long directions, respectively, the leads can be easily inserted into the through holes.

[0116] Furthermore, since through holes 404 and 405 are formed by cutting out an end of printed wiring board 100 in a U-shape, insertion type component 701 can be mounted on the end of printed wiring board 100 .

[0117] In this embodiment, a flat cross-sectional shape of the lead 702 is taken as an example, but this embodiment can be applied to any lead shape such as a wave shape or an oval shape.

[0118] In addition, in this embodiment, a combination of an approximately oval through hole and an approximately circular through hole is given as an example, but any combination of through holes of any shape may be used as long as the combination is of a shape that can be expected to prevent misalignment according to the lead shape.

[0119] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0120] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as U-shaped, but the lands may be of any shape.

[0121] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0122] According to the fourth embodiment, it is possible to easily insert the leads into the through holes and to prevent the components from being misaligned. Also, it is possible to mount an insertion type component on the edge of the printed wiring board.

[0123] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0124] The printed wiring board of the fifth embodiment will be described with reference to FIGS. 10A and 10B.

[0125] The fifth embodiment is an example in which an insertion-type component 701 having a protrusion shape on a lead 702 is mounted on a printed wiring board 100. In the fifth embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0126] FIG. 10A is a cross-sectional view and a top view showing an example in which a lead having a protrusion shape is inserted into a circular through-hole of a size recommended by the manufacturer.

[0127] The insertion type component 701 has two leads 702. The leads 702 each have a protrusion 703 for fixing the lead 702 to the inner wall 101 of the circular through hole 102. At the position where the protrusion 703 is provided, the lead 702 has a flat cross section, and is disposed in the insertion type component 701 such that the longitudinal directions of the cross sections of the respective leads 702 are in the same direction.

[0128] Therefore, when the lead 702 is inserted into the circular through-hole 102 of the size recommended by the manufacturer, the inner wall 101 of the circular through-hole 102 and the protruding shape 703 may interfere excessively, causing the lead 702 to bend in an arched manner.

[0129] FIG. 10B is a cross-sectional view and a top view showing an example of the printed wiring board of Example 5.

[0130] Printed wiring board 100 has oval through hole 402 and circular through hole 102 at positions where two leads 702 of insertion-type component 701 are inserted, respectively.

[0131] By combining the oval through hole 402 and the circular through hole 403, the oval through hole 402 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the circular through hole 403 suppresses the misalignment of the lead 702 in the long direction indicated by the arrow 910, thereby suppressing the positional misalignment of the insertion-type component 701.

[0132] Moreover, the oval through hole 402 and the circular through hole 403 are formed to a size that provides clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

[0133] Moreover, excessive interference of the protrusions 703 of the leads 702 with the inner walls 101 of the through holes is reduced, making it possible to prevent the leads 702 from bending in an arched manner.

[0134] In this embodiment, the lead has a protruding shape as an example, but this embodiment can be applied to any lead shape such as a dogleg shape or a wavy shape.

[0135] In addition, in this embodiment, a combination of oval and circular through holes is given as an example, but any combination of through holes of any shape may be used as long as the combination is of a shape that can be expected to prevent misalignment according to the lead shape.

[0136] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0137] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as circles, but the lands may be of any shape.

[0138] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0139] According to the fifth embodiment, it is possible to facilitate the insertion of the protruding leads into the through holes and to prevent the components from being misaligned.

[0140] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0141] The printed wiring board of the sixth embodiment will be described with reference to FIG.

[0142] Example 6 is an example of a printed wiring board having a non-through hole whose inner wall is not copper plated. In Example 6, the same components as those in Example 1 are given the same reference numerals, and the description thereof will be omitted.

[0143] Sixth Embodiment FIG. 11 is a cross-sectional view and a top view showing an example of a printed wiring board according to a sixth embodiment.

[0144] The insertion type component 701 has four leads 702 arranged in a row. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal direction of the cross section of each lead 702 is in the same direction.

[0145] Printed wiring board 100 has oval hole 406 and circular hole 407 at positions where leads 702 on both ends of insertion-type component 701 are inserted, and has circular through-holes 403 at positions where other leads 702 are inserted.

[0146] The inner walls of the oval hole 406 and the circular hole 407 are not copper plated, and are non-through holes that do not have a land around them on the outer surface of the printed wiring board 100. The oval hole 406 is an oval whose short-side length is the short-side length of the lead 702 + the clearance value x 2. The circular hole 407 is a circle whose diameter is the longitudinal length of the lead 702 + the clearance value x 2.

[0147] By combining the oval hole 406 and the circular hole 407, the oval hole 406 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the circular hole 407 suppresses the misalignment of the lead 702 in the long direction indicated by the arrow 910, thereby suppressing the positional misalignment of the insertion type component 701.

[0148] Moreover, the oval hole 406 and the circular hole 407 are formed to a size that provides clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

[0149] In this embodiment, both ends are formed as oval holes 406 and circular holes 407, and the rest are formed as circular through holes 403; however, the order in which the holes or through holes are arranged is not limited to this, and any combination of oval holes or through holes and circular holes or through holes may be used.

[0150] In addition, in this embodiment, an insertion type component 701 having four leads 702 arranged in a row is given as an example, but the number and arrangement of the leads are not limited to this, and the insertion type component may have multiple rows of leads.

[0151] In addition, in this embodiment, a flat cross-sectional shape of the lead 702 is taken as an example, but this embodiment can be applied to any lead shape such as a wave shape or an oval shape.

[0152] In addition, in this embodiment, a combination of oval and circular through holes or holes is given as an example, but any shape of through holes or hole combination may be used as long as the shape of the through holes or holes is expected to prevent misalignment according to the lead shape.

[0153] Furthermore, in this embodiment, the shape of one through hole or hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0154] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as circles, but the lands may be of any shape.

[0155] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0156] According to the sixth embodiment, it is possible to facilitate the insertion of the leads into the non-through holes and to prevent the positional deviation of the components.

[0157] Furthermore, since the non-through holes can be processed by a drilling device, an increase in costs can be prevented. EXAMPLES

[0158] The printed wiring board of the seventh embodiment will be described with reference to FIG.

[0159] Example 7 is an example of a printed wiring board in which two oval through holes of different sizes are combined. In Example 7, the same components as those in Example 1 are given the same reference numerals, and the description thereof will be omitted.

[0160] FIG. 12 is a cross-sectional view and a top view showing an example of a printed wiring board according to a seventh embodiment.

[0161] The insertion type component 701 includes two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 such that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

[0162] Printed wiring board 100 has oval through holes 402 and 408 at positions where two leads 702 of insertion-type component 701 are inserted. Oval through hole 408 has an oval shape whose short-side length is the long-side length of lead 702 plus twice the clearance value.

[0163] By combining oval through hole 402 and oval through hole 408, oval through hole 402 suppresses misalignment of lead 702 in the short direction indicated by arrow 911, and oval through hole 408 suppresses misalignment of lead 702 in the long direction indicated by arrow 910, thereby suppressing positional misalignment of insertion-type component 701.

[0164] Further, the oval through holes 402 and 408 are formed to have a size that provides clearance for the short and long lengths of the leads 702, respectively, so that the leads can be easily inserted into the through holes.

[0165] In this embodiment, a flat cross-sectional shape of the lead 702 is taken as an example, but this embodiment can be applied to any lead shape such as a wave shape or an oval shape.

[0166] Furthermore, in this embodiment, a combination of oval through holes is taken as an example, but any shape of through holes may be combined as long as the combination of through holes is shaped to match the lead shape and is expected to prevent misalignment.

[0167] Furthermore, in this embodiment, the shape of one through hole is the same in all layers of printed wiring board 100, but the shape may be different between the outer layer and the inner layer.

[0168] In addition, in this embodiment, the lands on the outer surface of printed wiring board 100 are depicted as circles, but the lands may be of any shape.

[0169] Although a four-layer printed wiring board is used as an example in this embodiment, it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can be obtained with printed wiring boards made of any base material.

[0170] According to the seventh embodiment, it is possible to facilitate the insertion of the leads into the through holes and to prevent the components from being misaligned.

[0171] Furthermore, since the through holes can be processed by a drilling device, an increase in costs can be prevented.

[0172] The present invention is not limited to the above-described embodiments, and includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the configurations described. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0173] 100... printed wiring board, 203, 204, 205... substrate, 402... oval through hole, 403... circular through hole, 701... insertion type component, 702... lead

Claims

1. In a printed wiring board on which a component having at least two leads is mounted, At least two holes for inserting the leads, The hole is at least one first hole having a length in one direction that is a length of the lead in the one direction plus a predetermined clearance value; At least one second hole having a length in a direction perpendicular to the one direction that is equal to a length of the lead in the direction perpendicular to the one direction plus a predetermined clearance value; A printed wiring board having

2. 2. The printed wiring board according to claim 1, the leads have a flat cross section and are arranged on the component such that the longitudinal directions of the cross sections of the respective leads are aligned in the same direction; the first hole has a length in the one direction that is a length in a short direction of a cross section of the lead plus a predetermined clearance value; A printed wiring board in which the second hole has a length in a direction perpendicular to the one direction that is equal to the longitudinal length of the cross section of the lead plus a predetermined clearance value.

3. 3. The printed wiring board according to claim 2, the first hole has an elliptical shape whose length in the one direction is equal to a length in a short direction of a cross section of the lead plus a predetermined clearance value; The second hole is a circle having a diameter equal to the longitudinal length of the cross section of the lead plus a predetermined clearance value.

4. 3. The printed wiring board according to claim 2, the first hole has an elliptical shape whose length in the one direction is equal to a length in a short direction of a cross section of the lead plus a predetermined clearance value; A printed wiring board, wherein the second hole is an ellipse whose length in a direction perpendicular to the one direction is equal to the longitudinal length of the cross section of the lead plus a predetermined clearance value.

5. 3. The printed wiring board according to claim 2, At least one of the holes is formed by cutting an end of the printed wiring board into a U-shape.

6. 3. The printed wiring board according to claim 2, At least one of the holes has an inner wall plated with copper.

7. 3. The printed wiring board according to claim 2, At least one of the holes has an inner wall that is not copper plated.

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