WO2025062728A1 - Printed wiring board - Google Patents

Abstract

The present invention provides a technology by which the insertion of a lead into a through hole is facilitated and it is possible to suppress positional deviation of a component. Two leads 702 have a plate-shaped cross section and are disposed on an insertion-type component 701 so that the length direction of the cross section of each of the leads 702 is the same direction. A printed wiring board 100 includes: an oval through hole 402 configured so that the width-direction length is obtained by adding a prescribed clearance value to the width-direction length of the lead 702; and a circular through hole 402 configured so that the diametrical length thereof is obtained by adding a prescribed clearance value to the length-direction length of the lead 702.

Description

Printed Wiring Boards

The present invention relates to a printed wiring board.

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.

Leads come in a variety of cross-sectional shapes, including circular, angular, and flat. 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.

One way to prevent components from tilting is to make the shape of the through-holes in the printed wiring board oval to match the flat shape of the leads, but electronic components have become increasingly miniaturized in recent years, making it difficult to use a drilling machine to create an oval hole of the optimal size for small, flat leads. If the hole is enlarged to a size that can be processed with a drilling machine, the through-hole will be larger than the size of the lead, resulting in a problem of greater misalignment of the components.

In addition, router devices and laser devices are considered as hole processing devices other than drill devices, but router devices take a long time to process and laser devices are expensive, so both increase costs.

As a technology for preventing 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 slits are formed around the through hole. By arranging slits around the through hole, the printed wiring board of Patent Document 1 can prevent 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 around the through hole, even if the external terminal is slightly tilted or deformed.

JP 2016-6806 A

However, in order to prevent component tilt and misalignment using the technology in 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 in Patent Document 1 does not make it easy to insert the leads into the through-holes or prevent deformation of the leads.

The present invention aims to provide a technology that makes it easier to insert leads into through holes and prevents components from misaligning.

In order to solve the above problem, 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 into which the leads are respectively inserted, with 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.

The present invention makes it easier to insert leads into through holes and reduces component misalignment.

　Problems, configurations and advantages other than those mentioned above will become clear from the description of the embodiments below.

1A and 1B are cross-sectional and top views illustrating a method for processing a circular through-hole in a printed wiring board. 1A and 1B are cross-sectional and top views illustrating a method for processing a circular through-hole in a printed wiring board. 1A and 1B are cross-sectional and top views illustrating a method for processing an oval through-hole in a printed wiring board. 1A and 1B are cross-sectional and top views illustrating a method for processing an oval through-hole in a printed wiring board. 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. 1A to 1C are cross-sectional views for explaining a method of mounting an insertion-type component on a printed wiring board. 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. 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. FIG. 13 is a top view illustrating the size of an oval through hole. 1A and 1B are diagrams showing an example of mounting an insertion-type component on a printed wiring board having an oval through hole. FIG. 13 is a top view illustrating the size of a circular through hole. 1A and 1B are diagrams showing an example of mounting an insertion-type component on a printed wiring board having a circular through hole. 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. 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 of the present invention. 13A and 13B are a cross-sectional view and a top view showing an example of a printed wiring board according to a third embodiment. 13A and 13B are a cross-sectional view and a top view showing an example of a printed wiring board according to a fourth embodiment of the present invention. 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. 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 of the present invention. 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 of the present invention. 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.

The following describes the embodiment with reference to the drawings.

The embodiment described below shows one form for implementing the present invention, and the present invention is not limited to this embodiment. In addition, in each of the following figures, the same devices (members or parts) are given the same reference numerals, and, as a general rule, descriptions of devices that have already been described will be omitted. In addition, in the following embodiments, when the number of elements is mentioned, it is not limited to that specific number, except in cases where the necessity for that number of elements is explained.

First, we will explain how to process through-holes in a printed wiring board and how to mount insertion-type components on a printed wiring board.

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.

A through hole is a hole that is drilled into a printed wiring board using 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, and serves both as an electrical connection and as a fixing hole for components mounted on the printed wiring board.

Through holes are generally circular or oval in shape. A copper foil pattern called a land is formed around the through hole on the outer or inner surface of the printed wiring board. A land is always formed on the outer surface of the printed wiring board for soldering.

Figures 1A and 1B are a cross-sectional view and a top view illustrating a method for machining a circular through-hole in a printed wiring board.

As shown in FIG. 1A, the printed wiring board 100 includes an insulating base material 204 called a core material, adhesive and insulating base materials 203 and 205 called prepregs, and copper foils 103, 104, 105, and 106.

Copper foil 103 and copper foil 104 are attached to both sides of substrate 204 in advance. Furthermore, when substrate 204 is sandwiched between substrates 203 and 205 and copper foils 105 and 106 are placed on top of it and heated and pressurized, substrates 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 surface.

This section describes how to process the circular through-hole 102 in the printed wiring board 100.

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

Next, as shown in FIG. 1B, the inner wall 101 of the hole is copper-plated to adhere the copper foil 107, completing the circular through-hole 102.

Figures 2A and 2B are cross-sectional and top views illustrating a method for machining oval through-holes in a printed wiring board.

This section describes the oval through-hole processing of the printed wiring board 100.

First, as shown in FIG. 2A, a drilling device 301 is used to perform a zigzag drilling process on the printed wiring board 100, forming an oval hole having an inner wall 101.

In staggered drilling, circular hole 501a is drilled in printed wiring board 100 with drill device 301, and then drill device 301 is moved horizontally as indicated by arrow 601 to drill hole 501b. After that, drill device 301 is moved horizontally as indicated by arrow 602 to drill hole 501c, then drill device 301 is moved horizontally as indicated by arrow 603 to drill hole 501d, and then drill device 301 is moved horizontally as indicated by arrow 604 to drill hole 501e. In this way, 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 drill device 301.

Next, as shown in FIG. 2B, the inner wall 101 of the hole is copper-plated to adhere the copper foil 107, completing the oval through-hole 401.

Next, we will explain how to mount insertion-type components on the printed wiring board 100.

Figures 3A to 3C are cross-sectional views that explain how to mount an insertion-type component on a printed wiring board.

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.

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

The lead 702 is inserted into the circular through hole 102 from the A-side 201 side of the printed wiring board 100 so that its tip protrudes to the B-side 202 side.

Next, as shown in FIG. 3B, the insertion type component 701 is soldered to the printed wiring board 100 using a flow method.

The flow method is a method in which the printed wiring board 100, into which the leads 702 of the insertion-type component 701 have been inserted, is sent by a conveyor to a solder bath 801 and soldered.

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.

As shown in FIG. 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 filled with solder 802 without leaving any gaps. As the molten solder 802 hardens, the printed wiring board 100 and the insertion-type component 701 are bonded together.

Figures 4A and 4B are a cross-sectional view and a top view showing an example of inserting a flat lead into a circular through-hole of the size recommended by the manufacturer.

The insertion type component 701 has two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

The printed wiring board 100 has two circular through holes 102 at positions where the two leads 702 of the insertion type component 701 are inserted. The hole diameter size of the circular through holes 102 uses the value recommended by the component manufacturer.

The worker manually inserts the two leads 702 of the insertion-type component 701 into the circular through-hole 102 of the printed wiring board 100 in the direction of the arrow 901.

At this time, as shown in FIG. 4B, the lead 702 may bend inside the circular through-hole 102, causing the insertion-type component 701 to tilt relative to the printed wiring board 100.

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

In addition, in order to prevent misalignment when mounting the insertion-type component 701 on the printed wiring board 100, the diameter 902 of the circular through-hole 102 recommended by the component manufacturer is equal to the longitudinal length 903 of the lead 702, which makes it easy for the lead 702 to interfere with the circular through-hole 102. As a result, it is necessary to press the lead 702 into the circular through-hole 102 with a large force, and the lead 702 is prone to bending when pressed.

An example in which a circular through hole 102 of the manufacturer's recommended size is replaced with an oval through hole 402 that matches the cross-sectional shape of the lead 702 in order to prevent the insertion-type component 701 from tilting is described using Figures 5A and 5B.

Figure 5A is a top view illustrating the size of the oval through holes.

The printed wiring board 100 has two oval through holes 402 at positions where the two leads 702 of the insertion-type component 701 are inserted.

The short-side length B' of the oval through-hole 402 is set to the short-side length B of the lead 702 + clearance value x 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 misalignment of the lead 702 in the short-side direction.

The longitudinal length A' of the oval through hole 402, like the lateral length B', is ideally the longitudinal length A of the lead 702 plus the clearance value x 2. However, as described above in FIG. 2A, in order to drill the oval through hole 402 in the printed wiring board 100, the staggered movement distance of the drilling device 301 must be at least the diameter of the drilling device 301. Therefore, as a constraint value for the drilling device 301, the longitudinal length A' of the oval through hole 402 is twice the lateral length B' of the oval through hole 402, which is greater than the ideal value.

Figure 5B shows an example of mounting an insertion-type component on a printed wiring board with an oval through hole.

As shown in FIG. 5B, when the lead 702 of the insertion-type component 701 is inserted into the oval through-hole 402, the short-side length B' of the oval through-hole 402 is the short-side length B of the lead 702 + clearance value x 2, so the misalignment of the lead 702 in the short-side direction indicated by the arrow 911 is suppressed.

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

An example in which the circular through-hole size is changed to a size larger than the circular through-hole 102 recommended by the manufacturer in order to prevent the insertion-type component 701 from tilting is described using Figures 5C and 5D.

Figure 5C is a top view illustrating the size of the circular through holes.

The printed wiring board 100 has two circular through holes 403 at positions where the two leads 702 of the insertion-type component 701 are inserted.

The diameter A' of the circular through hole 403 is set to the longitudinal length A of the lead 702 + clearance value x 2.

Figure 5D shows an example of mounting an insertion-type component on a printed wiring board with a circular through hole.

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

However, the clearance value of the gap 412 between the circular through hole 403 and the lead 702 in the short direction is too large, so misalignment of the lead 702 in the short direction, as indicated by the arrow 911, is likely to occur.

The printed wiring board of Example 1 is explained using Figure 6.

Example 1 is a printed wiring board that combines an oval through hole 402 and a circular through hole 403.

FIG. 6 shows a cross-sectional view and a top view of an example of a printed wiring board according to the first embodiment.

The insertion type component 701 has two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

The printed wiring board 100 has an oval through hole 402 and a circular through hole 102 at positions where the two leads 702 of the insertion type component 701 are inserted.

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, while 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.

Furthermore, 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.

In this embodiment, a flat cross-sectional shape is given as an example of the cross-sectional shape of the lead 702, but this embodiment can also be applied to any lead shape, such as a corrugated or oval shape.

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

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the first embodiment, it is possible to easily insert the leads into the through holes and prevent misalignment of the components.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 2 is explained using Figure 7.

Example 2 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 Example 2, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

FIG. 7 shows a cross-sectional view and a top view of an example of a printed wiring board according to Example 2.

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.

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

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, while 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.

Furthermore, 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.

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 will do.

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 an 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.

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

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the second embodiment, it is possible to easily insert the leads into the through holes and prevent the components from shifting out of position.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 3 is explained using Figure 8.

Example 3 is an example in which multiple insertion-type components 701 are mounted on multiple printed wiring boards 100. In Example 3, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

FIG. 8 shows a cross-sectional view and a top view of an example of a printed wiring board according to Example 3.

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.

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

The insertion type components 701a and 701b are each connected to the printed wiring board 100a by two leads 702 provided on the upper side, and to the printed wiring board 100b by two leads 702 provided on the lower side.

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 and 701b.

Furthermore, 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.

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 will do.

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

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

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

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

In addition, in this embodiment, the lands on the outer surface of the printed wiring boards 100a and 100b are shown as circles, but the lands may be of any shape.

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the third embodiment, it is possible to easily insert the leads into the through holes and prevent misalignment of the components.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 4 is explained using Figure 9.

Example 4 is an example in which an insertion type component 701 is mounted on the end of a printed wiring board 100. In Example 4, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

FIG. 9 shows a cross-sectional view and a top view of an example of a printed wiring board according to Example 4.

The insertion type component 701 has two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

The printed wiring board 100 has through holes 404, 405 at positions where the leads 702 of the insertion-type component 701 are inserted.

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

By combining through holes 404 and 405, through holes 404 suppress the misalignment of leads 702 in the short direction indicated by arrow 911, and through holes 405 suppress the misalignment of leads 702 in the long direction indicated by arrow 910, thereby suppressing the positional misalignment of insertion-type components 701.

In addition, the through holes 404 and 405 are sized to provide clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through holes.

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

In this embodiment, a flat cross-sectional shape is given as an example of the cross-sectional shape of the lead 702, but this embodiment can also be applied to any lead shape, such as a corrugated or oval shape.

In addition, in this embodiment, a combination of a substantially oval through hole and a substantially 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 in a shape that can be expected to prevent misalignment according to the lead shape.

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the fourth embodiment, it is possible to easily insert the leads into the through holes and to prevent misalignment of the components. In addition, it is possible to mount insertion-type components on the ends of the printed wiring board.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 5 will be explained using Figures 10A and 10B.

Example 5 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 Example 5, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

Figure 10A shows a cross-sectional view and a top view of an example of inserting a lead with a protruding shape into a circular through-hole of the size recommended by the manufacturer.

The insertion type component 701 has two leads 702. Each lead 702 has 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 arranged in the insertion type component 701 so that the longitudinal directions of the cross sections of each lead 702 are in the same direction.

As a result, when the lead 702 is inserted into a circular through-hole 102 of the size recommended by the manufacturer, there may be excessive interference between the inner wall 101 of the circular through-hole 102 and the protrusion shape 703, causing the lead 702 to bend in an arched shape.

FIG. 10B is a cross-sectional view and a top view showing an example of a printed wiring board according to Example 5.

The printed wiring board 100 has an oval through hole 402 and a circular through hole 102 at positions where the two leads 702 of the insertion type component 701 are inserted.

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, while 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.

Furthermore, 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.

In addition, excessive interference of the protrusion shape 703 of the lead 702 with the inner wall 101 of the through hole is reduced, preventing the lead 702 from bending in an arc.

In this embodiment, a lead with a protruding shape is used as an example, but this embodiment can also be applied to any lead shape, such as a dogleg shape or a wavy shape.

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

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the fifth embodiment, it is possible to easily insert the protruding leads into the through holes and to prevent the components from shifting out of position.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 6 is explained using Figure 11.

Example 6 is an example of a printed wiring board having non-through holes whose inner walls are not copper-plated. In Example 6, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

FIG. 11 shows a cross-sectional view and a top view of an example of a printed wiring board according to Example 6.

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.

The printed wiring board 100 has an oval hole 406 and a circular hole 407 at the positions where the leads 702 at both ends of the insertion type component 701 are inserted, and has circular through holes 403 at the positions where the other leads 702 are inserted.

The oval hole 406 and the circular hole 407 are non-through holes whose inner walls are not copper plated and which do not have lands 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.

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.

In addition, the oval hole 406 and the circular hole 407 are sized to provide clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through hole.

In this embodiment, both ends are oval holes 406 and circular holes 407, and the rest are circular through holes 403, but 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 will do.

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 cross-sectional shape is given as an example of the cross-sectional shape of the lead 702, but this embodiment can be applied to any lead shape, such as a corrugated or oval shape.

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 hole or hole combination can be used as long as it is a combination of through holes or holes that can be expected to prevent misalignment according to the lead shape.

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the sixth embodiment, it is possible to easily insert the leads into the non-through holes and to prevent the components from misaligning.

In addition, non-through holes can be machined using a drilling device, which helps prevent increases in costs.

The printed wiring board of Example 7 is explained using Figure 12.

Example 7 is an example of a printed wiring board that combines two oval through holes of different sizes. In Example 7, the same components as in Example 1 are given the same reference numerals, and the description thereof is omitted.

FIG. 12 shows a cross-sectional view and a top view of an example of a printed wiring board according to Example 7.

The insertion type component 701 has two leads 702. The leads 702 have a flat cross section, and are arranged in the insertion type component 701 so that the longitudinal directions of the cross sections of the leads 702 are in the same direction.

The printed wiring board 100 has an oval through hole 402 and an oval through hole 408 at positions where the two leads 702 of the insertion-type component 701 are inserted. The oval through hole 408 has an oval shape whose short-side length is the long-side length of the lead 702 plus the clearance value x 2.

By combining the oval through hole 402 and the oval through hole 408, the oval through hole 402 suppresses the misalignment of the lead 702 in the short direction indicated by the arrow 911, and the oval through hole 408 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.

In addition, the oval through holes 402 and 408 are sized to provide clearance for the short and long lengths of the lead 702, respectively, so that the lead can be easily inserted into the through holes.

In this embodiment, a flat cross-sectional shape is given as an example of the cross-sectional shape of the lead 702, but this embodiment can also be applied to any lead shape, such as a corrugated or oval shape.

In addition, in this embodiment, a combination of oval through holes is given as an example, but any combination of through holes can be used as long as the combination is shaped to match the lead shape and is expected to prevent misalignment.

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

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

In addition, in this embodiment, a four-layer printed wiring board is given as an example, but it may be a multi-layered printed wiring board or a single-sided printed wiring board. The same effect can also be achieved with printed wiring boards made from any base material.

According to the seventh embodiment, it is possible to easily insert the leads into the through holes and prevent misalignment of the components.

In addition, through holes can be machined using a drilling device, which helps prevent increases in costs.

The present invention is not limited to the above-described embodiments, but includes various modified examples. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. It is also possible to replace 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 part of the configuration of each embodiment with other configurations.

100...Printed wiring board, 203, 204, 205...Base material, 402...Oval through hole, 403...Circular through hole, 701...Insertion type component, 702...Lead

Claims (7)

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. 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 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. The printed wiring board according to claim 2,
the first hole has an elliptical shape whose one direction is a length equal to a short-side length 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. 3. The printed wiring board according to claim 2,
the first hole has an elliptical shape whose one direction is a length equal to a short-side length 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. 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. 3. The printed wiring board according to claim 2,
At least one of the holes has an inner wall plated with copper. 3. The printed wiring board according to claim 2,
A printed wiring board in which at least one of the holes has an inner wall that is not copper plated.