JPH10256683A - Ground reinforcing method of printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce the ground of a printed wiring board through a metallic housing, by connecting electrically connectors with the ground pattern of the printed wiring board, and by making on the metallic housing build-up portions for connector insertions, and further, by inserting the build-up portions into the connectors of the printed wiring board to connect the build-up portions with the connectors. SOLUTION: On the solder surface side of a printed wiring board 1, an IC 2 and other parts 3 are mounted, and edge connectors 7, 8 are mounted on the arbitrary places of a ground (GND) pattern present on the opposite surface side to the solder surface of the printed board 1. Then, to the opposite surface side, a plate metal 6 is applied instead of a metallic housing. In the plate metal 6, a build-up portion 10a and build-up portions 10b are formed correspondingly to the place of a screwing hole 9 and the places of the edge connectors 7, 8. When putting the printed wiring board 1 on the plate metal 6, the vertical build-up portions 10b present on the plate metal 6 are inserted into the edge connectors 7, 8 to be connected electrically with them, and in the build-up portion 10a, a setscrew 5 is screwed through the screwing hole 9, and electrical connections are performed at the four corners of the board 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for enhancing the ground of a printed wiring board so as to efficiently suppress radiation noise by enhancing the ground of the printed wiring board (hereinafter referred to as "GND").

[0002]

2. Description of the Related Art Heretofore, in order to strengthen the GND of a printed wiring board and keep it at a stable level, a method of increasing the GND area by multilayering has been adopted. However, with the recent increase in the processing speed of devices and the sophistication of color images, etc., the amount of data processing has increased. On the other hand, in order to enhance the competitiveness of products, products have been downsized and the number of layers has been reduced. For example, it is becoming difficult to simply increase the number of layers so as to enhance GND, as in the case of moving in the direction.

Therefore, it is conceivable to use a metal housing which is a structural member of a product to enhance the GND of a weak printed wiring board. That is, the printed wiring board and the metal housing are connected at many points, and apparently the GN of the printed wiring board is connected.
This is a method of increasing D.

Usually, as a method, a rising portion is formed in a metal housing, and a screw hole is cut there. On the other hand, the printed wiring board is provided with lands from which the resist has been peeled off. This land is connected to GND so that the head of a screw inserted into a hole that is not connected to a through-hole of the printed wiring board is brought into contact with the printed wiring board, or the metal housing and the printed wiring board are connected in a plane. It is for contact. Then, by screwing the printed wiring board to the rising portion, the metal housing and the GND of the printed wiring board are connected.

FIG. 18 is a perspective view schematically showing a structure for suitably implementing a conventional method for reinforcing the ground of a printed wiring board. In FIG. 18, the metal housing 114 is set up so as to have a horizontal surface with respect to the printed wiring board.
0 is formed, and the metal housing 114 and the GND pattern 113 on the printed wiring board are screw-connected by the set screw 105 via the screw hole 115 of the non-through hole.

The rising portion is formed by bending a part of the metal housing to form a tongue, or by fixing a tongue-shaped conductive plate to the metal housing.

[0007]

However, in the connection structure between the printed wiring board and the metal housing according to the prior art as described above, the printed wiring board needs a hole large enough for a screw to pass. However, if the clearance of the hole is included, the size becomes considerably large, so that the GND pattern is divided. That is, as can be seen from FIG. 18, due to restrictions on screwing, signal lines and through holes are largely avoided around the screw holes, which hinders the degree of freedom in wiring. For this reason, the screw holes are provided only in the printed wiring board where there is a sufficient space, that is, only in the four corners of the substrate. Therefore, a standing wave due to the size of the substrate occurs, and conversely, the noise level increases at a specific frequency. Also, in order for the metal housing to come into surface contact with the printed wiring board, a rising portion must be made so as to be parallel to the printed wiring board. Therefore, a part of the metal housing is bent to form a tongue piece. In such a case, the housing is largely cut off, and the metal housing becomes weak as a structural member and as a GND.

Further, in terms of workability, complicated work of screwing is required.

In the method of mounting a printed wiring board on a metal housing by increasing the number of screw connection points in order to enhance GND according to the above-described conventional example, a screwing space is provided from the stage of manufacturing the printed wiring board. There is a need. At this time, since it is not known how much screwing is effective in reducing the radiation noise, more screwing space is required. As a result, the wiring space is restricted. If the printed wiring board is simply enlarged in order to take up wiring space, the cost is increased and the size cannot be reduced. Therefore, if you aim to reduce radiation noise in consideration of such problems,
The printed wiring board and the housing have to be manufactured and processed several times, which takes time, resulting in an increase in cost.

[0010] Further, a plurality of conductive plate materials according to the above-described conventional example, which are bent in a tongue shape, are fixed to a metal housing, and the GN of the printed wiring board is screwed through the tongue-like conductive plate material.
In the method of connecting the D pattern and the metal housing, it is necessary to consider a mounting space for the conductive plate material from the design stage, and also to secure a screw mounting space. For this reason, there has been a problem that the miniaturization cannot be performed, and if a design change occurs in the noise countermeasures, it is necessary to start over from the initial design stage, which takes time and increases the cost.

In view of the above-mentioned problems of the prior art, an object of the present invention is to connect a ground pattern of a printed wiring board to a metal housing or a conductive cabinet or the like easily.
It is an object of the present invention to provide a method for reinforcing a ground of a printed wiring board, which can arbitrarily change a ground connection portion and enhance GND.

[0012]

According to a first aspect of the present invention, there is provided a method for reinforcing the ground of a printed wiring board, wherein a connector is electrically connected to an arbitrary portion of a ground pattern of the printed wiring board. A rising portion that can be inserted into the connector is formed in a metal housing, and the connector and the rising portion are inserted and connected when the printed wiring board is placed on the metal housing. I do.

In the above method for reinforcing the ground of a printed wiring board, the connector used for ground connection may be a discrete type or a surface mount type, and any type of edge connector is particularly preferable. The edge connector is formed such that a gap sandwiched between connector pins to obtain sufficient connection reliability is made equal to the thickness of a sheet metal forming a metal housing. In addition, the rising portion is formed by cutting a part of the metal housing and rising, or by fixing another member formed by bending another member without notching the metal housing to the metal housing. It does not matter.

According to the first aspect of the present invention, the ground pattern of the printed wiring board can be formed at any position on the printed wiring board, in which the notch of the metal plate of the metal housing can be reduced and the connection can be performed with good workability. The connector connected only to the metal housing is provided on the side facing the metal housing, while the metal housing side makes a rising part so that it can be inserted vertically into this connector, so that when mounting the printed wiring board on the metal housing, It was made to insert and fit.

[0015] With this, even on a printed wiring board having little space in terms of wiring and mounted components, it is possible to connect the GND of the board and the metal housing at any point at multiple points. Is apparently enhanced, so that radiated noise can be kept low.

Further, a second invention which is an alternative to the above invention is:
A ground reinforcement method for a printed wiring board using a spring-shaped metal component connected to an arbitrary portion of a ground pattern of the printed wiring board and protruding from at least one surface of the printed wiring board.

According to the invention, when the printed wiring board is mounted on the metal housing, a ground pattern of the printed wiring board is connected to an arbitrary portion of the metal housing through the metal component. Another feature is that the metal component is projected from both sides of the printed wiring board and is connected to a conductive cabinet on the printed wiring board simultaneously with the metal housing.

The metal part has one end connected to a ground pattern on the surface of the printed wiring board by soldering, penetrating the printed wiring board, and projecting the other end from the back surface of the printed wiring board. is there. Alternatively, it may be connected to the ground pattern formed on the surface facing the metal housing by soldering, or may be connected to the ground pin of the component mounted on the printed wiring board by soldering.

Further, the metal component further includes a portion capable of sandwiching an outer peripheral edge of the printed wiring board, and the metal component is attached to an arbitrary portion of a ground pattern on the outer peripheral edge of the printed wiring board by the portion. It may be. Alternatively, the metal component is attached to a through hole formed in an outer peripheral edge of the printed wiring board by the portion, and the through hole is electrically connected to a ground pattern of the printed wiring board. Includes enhancement methods. In such a case, it is preferable that a portion of the metal component that can sandwich the outer peripheral edge of the printed wiring board is attached by a screw or solder.

In the second invention as described above, a spring-like metal component is attached to an arbitrary portion of the ground pattern or land on the front and back surfaces of the printed wiring board by soldering.
By screwing the printed wiring board to the metal housing,
High connection between the ground of the printed wiring board and the metal housing is enabled. The same applies to the case where a spring-like metal component is sandwiched between the ground pattern on the front surface and the back surface of the printed wiring board or an arbitrary portion of the through hole, and the printed wiring board is screwed to the metal housing.

When a conductive cabinet (fence) comes on the printed wiring board, a spring-like protruding metal part is attached to at least one surface of the printed wiring board, so that the ground of the printed wiring board and the cabinet or the cabinet are mounted. Electrical continuity can be established between the metal housing or the ground of the printed wiring board and the cabinet and the metal housing as appropriate.

Moreover, since the metal parts are spring-shaped, the connection between the ground pattern of the printed wiring board and the metal housing is strengthened, and the radiation of electromagnetic noise is suppressed. Further, since the metal component has a portion that can sandwich the outer peripheral edge of the printed wiring board, it is possible to repeatedly connect and disconnect to an arbitrary ground pattern on the outer peripheral edge of the printed wiring board. is there. Therefore, in the search for a connection point with a low noise level, while measuring the radiation noise,
It is possible to freely determine which ground pattern of the printed wiring board is connected to the metal housing and which part is separated.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
FIG. 4 is a side view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to the embodiment.
Here, a case will be described in which a sheet metal for reinforcement is attached so as to extend parallel to the printed wiring board.

In FIG. 1, on a printed wiring board 1,
IC2 such as QFP, SOP or DIP, and other parts 3 such as aluminum electrolytic capacitors, transistors, resistors, etc.
Also, a connector 4 and the like for interfacing with other substrates in the apparatus and external devices are mounted. On the other hand, the sheet metal 6 applied from the solder surface side of the printed wiring board 1, that is, the side opposite to the surface on which the IC 2, other components 3, the connector 4, etc. are mounted, is provided at four corners of the printed wiring board 1. Start-up part 10a corresponding to the position of screw hole 9
And a start-up portion 10b corresponding to the position of the edge connector 7, 8 provided at an arbitrary position on the printed wiring board 1. These edge connectors 7 and 8 are formed such that the gap between the edge connectors 7 and 8 that provides sufficient connection reliability by being sandwiched between the connector pins is equal to the thickness of the sheet metal 6.

Then, the printed wiring board 1 is placed on the sheet metal 6 so that a vertical rising portion 10b on the sheet metal 6 is formed.
Are electrically connected by being inserted into the GND connectors 7 and 8, and further, are screwed into the rising portions 10 a of the sheet metal 6 by passing the set screws 5 through the screw holes 9, so that Electrical connections are also made.

Here, the periphery of the screw hole 9 is GND.
The resist is removed by the pattern, and the GND pattern of the printed wiring board 1 and the sheet metal 6 are electrically connected by the contact between the set screw 5 and the solder surface. The edge connector 7 is mounted on the solder surface side of the printed wiring board 1 and is connected only to the GND pattern on the component surface / solder surface by soldering an external pin mounting hole of the connector 7. By inserting the rising portion 10b of the sheet metal 6 into the connector 7, the GND pattern of the printed wiring board 1 and the sheet metal 6 are electrically connected. As for the edge connector 8, this connector 8 is also mounted on the solder surface side of the printed wiring board 1, and is connected only to the GND pattern on the solder surface by soldering the external terminal mounting land portion of the connector 7 (of course, G of the solder side
The ND pattern is formed by the through holes provided in the periphery.
It is also connected to the GND pattern on the component surface. ), The rising portion 10b of the sheet metal 6 is inserted into the connector 8 so that the GND pattern of the printed wiring board 1 is
And are electrically connected.

[Second Embodiment] FIG. 2 shows a second embodiment of the present invention.
FIGS. 5A and 5B are diagrams schematically illustrating a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to the embodiment, wherein FIG. 6A is a top view of the printed wiring board, and FIG. FIG. 4 is a side view showing a connection state between the metal housing and the metal housing.

In FIG. 2, the starting portion 10 which is not a reinforcing sheet metal but is formed by cutting out a part of the metal housing 14 is provided.
The discrete-type card edge connector 7 mounted on the surface of the printed wiring board facing the metal housing 14 was inserted into the connector, and as a result, the metal housing 14 and the GND pattern 13 on the printed wiring board were electrically connected. It shows the state. Here, it can be seen that the signal lines 12 and the through holes 11 are wired so as to avoid the connector 7.

[Third Embodiment] FIG. 3 shows a third embodiment of the present invention.
FIGS. 5A and 5B are diagrams schematically illustrating a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to the embodiment, wherein FIG. 6A is a top view of the printed wiring board, and FIG. FIG. 4 is a side view showing a connection state between the metal housing and the metal housing.

In FIG. 3, the start-up section 10 which is not a sheet metal for reinforcement but a part of the metal housing 14 is cut and started,
The printed circuit board is inserted into a surface-mount type card edge connector 8 mounted on the surface of the printed circuit board facing the metal case 14, and as a result, the metal case 14 and the GND pattern 13 on the printed circuit board are electrically connected. It shows the state that it was. Here, the signal line 12 can be wired on the surface opposite to the surface on which the connector 8 is mounted, and the degree of freedom of pattern wiring is improved as compared with the case of the second embodiment. You can see that. Also, in this case, the connector pins are only GN on the surface facing the metal housing 14.
Although it is not connected to the D pattern 13 by soldering, it can also be seen that the through hole 11 provided in the GND pattern 13 in the peripheral portion can be sufficiently connected to the opposite surface.

[Fourth Embodiment] FIG. 4 shows a fourth embodiment of the present invention.
FIG. 4 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to the embodiment.
The embodiment shown in this figure shows that the rising portion of the reinforcing sheet metal 6 shown in FIG. 1 is a hook-shaped metal part 16 formed of a member different from the sheet metal 6.

[Fifth Embodiment] FIG. 5 shows a fifth embodiment of the present invention.
FIG. 4 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to the embodiment.
In the embodiment shown in this figure, a rising portion of the reinforcing sheet metal 6 shown in FIG. 1 is formed by fixing a key-shaped metal part 17 formed of a member separate from the sheet metal 6 to the sheet metal 6 with a set screw 17. It shows that.

In the first to fifth embodiments described above, all the pins of the connector are connected to the GND pattern of the printed wiring board. However, when a connector having more pins is used, a part of the connector is connected to the GND. It is sufficiently conceivable that the other parts are used for connection and signal lines are exchanged.

[Sixth Embodiment] FIG. 6 shows a sixth embodiment of the present invention.
FIG. 4 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to the embodiment.
FIG. 7 is a side view showing a state in which the printed wiring board shown in FIG. 6 is screwed to a metal housing.

In FIG. 6, a signal line 12 is provided on the printed wiring board 1. And the printed wiring board 1
When the GND pattern 13a cannot be connected to the ground pattern 13b in the screw hole 9 portion on the surface layer of the above, a through hole 11 is opened in the printed wiring board 1 and the GND pattern 1
3a, the connection device 18 which is a spring-like metal component is
9 for connection. One end of the connection device 18 is connected to the GND pattern 13a by solder 19, and the other end of the connection device 18 protrudes through the through hole 11 to the opposite side of the surface of the printed wiring board 1 on which the GND pattern 13a is formed.

Then, as shown in FIG. 7, the printed wiring board 1 and the housing frame 10 are connected using the set screw 5. Thus, the GND pattern 13a of the printed wiring board 1 and the metal housing 14 are strongly connected by the spring-shaped connection device 6. In addition, when the radiation noise is measured and the noise level becomes high, the radiation noise is removed and the connection device 18 is removed.
The GND pattern 13a and the GND pattern 13b are separated.

[Seventh Embodiment] FIG. 8 shows a seventh embodiment of the present invention.
FIG. 4 is a side view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to the embodiment.
This figure particularly shows a state in which the printed wiring board is screwed to the metal housing.

In FIG. 8, when the IC 2 and the like are mounted on the front surface of the printed wiring board 1 and the GND pattern 13a to be connected to the metal housing 14 exists on the back surface, the GND pattern 13
a, a leaf spring-like connecting device 18 is
Then, the printed wiring board 1 and the metal housing 14 are connected using the set screw 5. As a result, the GND pattern 13a of the printed wiring board 1 and the metal housing 14 are strongly connected by the spring-shaped connecting device 18. If it is desired to separate the GND pattern 13a of the printed wiring board 1 from the metal housing 14, the connection device 18 may be removed.

[Eighth Embodiment] FIGS. 9 and 10 are views schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to an eighth embodiment of the present invention. In particular, FIG. 9 is a perspective view of a printed wiring board including the connection structure according to the present embodiment, and FIG. 10 is a side view of the printed wiring board of FIG.

As shown in FIG. 9, when the GND pattern 13d is present on the outer peripheral surface of the printed wiring board 1, and when it is desired to strongly connect the GND pattern 13d to a metal housing (not shown), solder 19 is attached to the GND pattern 13d. A strong connection can be obtained by connecting the spring-like connecting device 18 in advance and fixing the printed wiring board 1 to the metal housing with screws. Also, when it is desired to connect a GND pattern 13c that cannot be connected to the GND pattern 13d of the screw portion to the metal housing,
By connecting the connection device 18 to the GND pattern 13c using solder 19 and screwing the printed wiring board 1 to the metal housing, a strong connection is possible.

The ground pins of the connector 21 can be connected to the metal housing by connecting the spring-like connecting device 18 to the lands 23 of the connector 21 and the connector pins 22 with solder 19. Furthermore, when a conductive cabinet is mounted from above by connecting the connection device 18 to the printed wiring board 1 on the opposite side of the metal housing 14, conduction with the cabinet can be achieved. Can be appropriately conducted.

By removing the connecting device 18 at any time, it becomes possible to separate the ground pattern, the ground pin and the metal housing.

[Ninth Embodiment] FIGS. 11 and 12 are diagrams schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a ninth embodiment of the present invention. Particularly, FIG. 11 is a perspective view showing a state of connection between the printed wiring board including the connection structure according to the present embodiment and the metal housing, and FIG. 12 is a cross-sectional view of the printed wiring board including the connection device shown in FIG.

As shown in FIGS. 11 and 12, in the printed wiring board 1 on which the IC 2 is mounted and the signal line 12 is wired, the GND pattern 1 on the outer peripheral edge of the printed wiring board 1 is provided.
3 is connected to the metal housing 14 using the screw holes 9, the screw holes 9 engaging with the set screws 5 are also provided on the housing 14 side.
And the GND of the printed wiring board 1
When the pattern 13 is to be connected to the metal housing 14, a spring-like connecting device 18 that can sandwich the outer peripheral edge of the printed wiring board 1 is used for the GND pattern 13. Thus, the number of connections between the metal housing 14 and the ground pattern 13 of the printed wiring board 1 can be increased. Also,
To further increase the connection strength, the ground pattern 13 and the connection device 18 are connected using solder.

Then, the metal housing 14 and the printed wiring board 1 are firmly mounted because the connecting device 18 has a spring shape by mounting with the set screw 5, and the metal housing 14 and the printed wiring board 1 are connected between the ground pattern 13 of the printed wiring board 1 and the metal housing 14. And a strong connection is obtained.

When a cabinet or the like having conductivity is mounted on the printed wiring board 1, the cabinet and the ground pattern of the printed wiring board can be connected by using the connection device 18.

[Tenth Embodiment] FIGS. 13 and 14
It is a figure showing typically the structure which suitably implements the ground reinforcement method of a printed wired board by a 10th embodiment of the present invention. In particular, FIG. 13 is a perspective view showing a state of connection between the printed wiring board including the connection structure according to the present embodiment and the metal housing, and FIG. 14 is a cross-sectional view of the printed wiring board including the connection device shown in FIG.

As shown in FIGS. 13 and 14, when a large space for the ground pattern cannot be provided on the surface layer of the printed wiring board 1, through holes 24 electrically connected to the ground wiring are provided.
Is provided on the printed wiring board 1, and a spring-like connecting device 18 capable of sandwiching the outer peripheral edge of the printed wiring board 1 is inserted into the hole of the through hole 24. Thereby, the connection device 18 can be strongly connected to the through hole 24. Also,
When it is desired to further increase the strength, the connection device 18 and the through hole 24 are preferably connected by soldering.

This makes it possible to mount a connection device capable of reliably reinforcing the ground in a narrow space, and at the same time, a point for connection with a conductive cabinet or the like arranged on a printed wiring board. Can have.

When the connection between the ground pattern and the metal housing is sufficient only by screwing, the connecting device 18 can be removed at any time.

[Eleventh Embodiment] FIG. 15 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to an eleventh embodiment of the present invention.

The embodiment shown in this figure makes the connection device according to the ninth embodiment shown in FIGS. 11 and 12 larger,
It is intended to electrically and mechanically connect a metal case, a ground pattern of a printed wiring board, and a cabinet.

Also in this embodiment, the ground pattern, the metal housing, and the cabinet can be separated by removing the connection device 18 at any time.

[Twelfth Embodiment] FIG. 16 is a view schematically showing a structure for suitably implementing a method for reinforcing the ground of a printed wiring board according to a twelfth embodiment of the present invention. In particular, FIG. 16 is a perspective view of a printed wiring board including the connection structure according to the present embodiment, and FIG. 17 is a cross-sectional view showing a state of connection between the printed wiring board shown in FIG. 16 and a metal housing.

In FIG. 16, when the space of the ground pattern 13 cannot be made large in the printed wiring board 1, the connection device 18 is mounted so as to overlap the screw hole 9 and the ground pattern 13 of the screw portion. As shown in FIG. 17, the connection device 18 was connected to the printed wiring board 1 by fixing the screws. As a result, it is possible to attach a connection device for surely strengthening the ground in a narrow space, and at the same time, it is possible to have a point for connection with a conductive cabinet or the like arranged on a printed wiring board.

When the connection between the ground pattern and the metal housing is sufficient only by screwing, and connection with the cabinet is unnecessary, the connection device 18 can be removed at any time by simply removing the connecting device 18 from the set screw 5.

[0058]

As described above, according to the present invention, a connector is electrically connected to an arbitrary portion of a ground pattern of a printed wiring board, and a rising portion which can be inserted into the connector is formed in a metal casing. A method of inserting and connecting the connector and the rising portion when placing the printed wiring board on the metal housing. According to such a method, the electrical connection between the GND pattern of the printed wiring board and the metal housing can be made satisfactorily at multiple points without impairing the degree of freedom of the signal wiring. It is possible to enhance the GND of the printed wiring board by the metal housing without worrying about the deterioration of noise due to the generation of the standing wave in the circumference. Therefore, the noise level emitted from the product can be suppressed. Further, stabilizing the GND of the printed wiring board is effective in terms of preventing circuit malfunction in terms of circuit operation.

Further, the present invention is a method of using a spring-shaped metal part which is connected to an arbitrary portion of a ground pattern of a printed wiring board and protrudes from at least one surface of the printed wiring board. According to this method, when the printed wiring board is attached to the metal housing and when a conductive cabinet is arranged on the printed wiring board, the printed wiring is passed through the metal component to the metal housing and / or the cabinet. Any number of ground patterns on the plate can be connected to any location. By this,
The ground of the printed wiring board is strengthened, so that radiation noise can be reduced, and the ground connection portion can be easily changed. Therefore, it is not necessary to change the design of the printed wiring board, the metal housing, and the cabinet, which leads to cost reduction.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a second embodiment of the present invention; FIG. 2A is a top view of the printed wiring board; FIG. 2B is a side view showing a connection state between the printed wiring board and the metal housing.

FIG. 3 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a third embodiment of the present invention, and FIG. 3A is a top view of the printed wiring board; FIG. 2B is a side view showing a connection state between the printed wiring board and the metal housing.

FIG. 4 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a fifth embodiment of the present invention.

FIG. 6 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a sixth embodiment of the present invention.

FIG. 7 is a side view showing a state where the printed wiring board shown in FIG. 6 is screwed to a metal housing.

FIG. 8 is a side view schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a seventh embodiment of the present invention.

FIG. 9 is a diagram schematically illustrating a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to an eighth embodiment of the present invention, and in particular, a perspective view of a printed wiring board including a connection structure according to the present embodiment. FIG.

FIG. 10 is a view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to an eighth embodiment of the present invention, and is a side view of the printed wiring board of FIG. 9 in particular.

FIG. 11 is a diagram schematically illustrating a structure for suitably implementing a method for reinforcing the ground of a printed wiring board according to a ninth embodiment of the present invention, and in particular, a printed wiring board including a connection structure according to the present embodiment and a metal; It is a perspective view showing a situation of connection with a case.

FIG. 12 is a view schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a ninth embodiment of the present invention, and in particular, a printed wiring board including the connection device shown in FIG. 11; FIG.

FIG. 13 is a view schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a tenth embodiment of the present invention. In particular, a printed wiring board including a connection structure according to the present embodiment and metal It is a perspective view showing a situation of connection with a case.

FIG. 14 is a diagram schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to a tenth embodiment of the present invention, and in particular, a printed wiring board including the connection device shown in FIG. 13; FIG.

FIG. 15 is a perspective view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to an eleventh embodiment of the present invention.

FIG. 16 is a view schematically showing a structure for suitably implementing a method for reinforcing a ground of a printed wiring board according to a twelfth embodiment of the present invention, and in particular, a perspective view of a printed wiring board including a connection structure according to the present embodiment; FIG.

FIG. 17 is a diagram schematically showing a structure for suitably implementing a method for strengthening the ground of a printed wiring board according to the twelfth embodiment of the present invention. In particular, the printed wiring board and the metal housing shown in FIG. FIG. 4 is a cross-sectional view showing a state of connection.

FIG. 18 is a perspective view schematically showing a structure for suitably implementing a conventional method for reinforcing a ground of a printed wiring board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printed wiring board 2 IC (QFP, SOP, DIP, etc.) 3 Other components (resistance, capacitor, etc.) 4, 20, 21 Interface connector 5, 17 Set screw 6 Sheet metal 7 Edge connector (discrete type) 8 Edge connector (surface) 9 Mounting screw hole 10a, 10b Rising section 11 Through hole 12 Signal line 13, 13a, 13b, 13c, 13d Ground (GND) pattern 14 Metal housing 15 Keyed metal part 18 Connection device 19, 26 Solder 22 Connector Pin 23 Land 24 Through hole 25 Chip resistor

Claims (17)

[Claims] 1. A connector is electrically connected to an arbitrary portion of a ground pattern of a printed wiring board, and a rising portion that can be inserted into the connector is formed in a metal housing, and the printed wiring board is connected to the metal housing. A method for reinforcing the ground of a printed wiring board, wherein the connector and the rising portion are inserted and connected when the connector is placed on a body. 2. The method according to claim 1, wherein the connector used for ground connection is of a discrete type. 3. The method according to claim 1, wherein the connector used for ground connection is of a surface mount type. 4. The method according to claim 1, wherein the connector used for ground connection is a discrete type or a surface mount type edge connector. 5. The edge connector according to claim 1, wherein a gap which is sandwiched by connector pins to obtain a sufficient connection reliability is formed to be equal to a thickness of a sheet metal forming a metal housing. Item 5. The method for reinforcing a ground of a printed wiring board according to Item 4. 6. The method according to claim 1, wherein the rising portion is formed by cutting a part of the metal housing and raising the metal housing. 7. The rising portion is formed by bending another member without cutting the metal housing and fixing the metal housing to the metal housing.
3. The method for reinforcing a ground of a printed wiring board according to the item 1. 8. A method for strengthening the ground of a printed wiring board, wherein a spring-like metal component connected to an arbitrary portion of a ground pattern of the printed wiring board and protruding from at least one surface of the printed wiring board is used. 9. The printed circuit according to claim 8, wherein, when attaching the printed wiring board to a metal housing, a ground pattern of the printed wiring board is connected to an arbitrary portion of the metal housing through the metal component. How to strengthen the ground of the wiring board. 10. The printed circuit board according to claim 9, wherein said metal component projects from both sides of said printed wiring board, and is connected to a conductive cabinet on said printed wiring board simultaneously with said metal housing. 3. The method for reinforcing a ground of a printed wiring board according to the item 1. 11. The metal component having one end connected to a ground pattern on the surface of the printed wiring board by solder, penetrating the printed wiring board, and projecting the other end from the back surface of the printed wiring board. 10. The method according to claim 8, wherein the ground is strengthened. 12. The method according to claim 9, wherein the metal component is connected to a ground pattern formed on a surface facing the metal housing by soldering. 13. The method according to claim 8, wherein the metal component is connected to a ground pin of a component mounted on the printed wiring board by soldering. 14. The metal component further comprises a portion capable of sandwiching an outer peripheral edge of the printed wiring board,
The method according to claim 8, wherein the portion is attached to an arbitrary portion of a ground pattern on an outer peripheral edge of the printed wiring board. 15. The metal component further includes a portion capable of sandwiching an outer peripheral edge of the printed wiring board.
The said part is attached to the through-hole formed in the outer peripheral edge part of the said printed wiring board, This through-hole is electrically connected with the ground pattern of the said printed wiring board, The Claims 8 or 9 characterized by the above-mentioned. How to strengthen the ground of a printed wiring board. 16. The method according to claim 14, wherein a portion of the metal component that can sandwich an outer peripheral edge of the printed wiring board is attached with a screw. . 17. The printed wiring board ground according to claim 14, wherein a portion of the metal component that can sandwich an outer peripheral edge of the printed wiring board is attached by solder. How to strengthen.