JPH08316662A - Electronic apparatus - Google Patents

Abstract

PURPOSE: To effectively connect an electrically conductive body covering a printed wiring board to ground potential as to an electronic apparatus with a construction preferable for miniaturization and high density mounting. CONSTITUTION: The head of an attaching screw 9, connected to ground potential 12 in a printed wiring board 7, for attaching the printed wiring board to a housing body 6, is electrically connected to an electrically conductive body 17 electrically covering the printed wiring board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a structure suitable for miniaturization and high-density mounting. A printed wiring board unitized to process signals is applied to electronic devices in the fields of communication and information processing. In the signal processing circuit in this printed wiring board,
Since weak and high-speed signals are processed in large capacity, it is possible to prevent inductive interference due to unnecessary signals from other electronic devices, and to prevent inductive emission of signals from the printed wiring board of the electronic device itself. Is also necessary.

For example, in an electronic device called a portable small notebook type personal computer, a pocket computer, a word processor, etc. as shown in FIG.
It is indispensable to take measures against the above-mentioned matters, and a high-density mounting technology for reducing the size and weight is required.

In FIG. 7, the electronic device 1 is a device body 2
The keyboard portion 3 is disposed on the upper surface of the device main body portion 2, and the display portion 5 is provided on one side edge 4 of the device body portion 2 at the standing position in the illustrated state and the folding position on the keyboard portion 3 at the one side edge 4. Along with it, it is rotatably supported.

The printed wiring board is housed inside the apparatus main body 2 and is covered by the keyboard 3.

[0005]

2. Description of the Related Art FIG. 8 is a side sectional view showing a conventional mounting structure of a printed wiring board in an electronic device 1 and only a main part thereof is shown in a schematic structure. As shown in FIG. 8A, the device main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. The detailed structure of the keyboard portion 3 itself is not shown.

The printed wiring board 7 is arranged on a printed wiring board mounting protrusion 8 which is integrally formed inside the housing body 6, and is mounted and fixed by a mounting screw 9 made of a plastic screw such as a tapping screw. .

On the inner surface of the casing body 6, a conductor 1 which is a metallized layer of Cu (copper) or the like formed by electroless plating or the like.
1 is formed on the entire inner surface including the end surface of the protrusion 8.
Ground conductor layers 12 and 13 connected by through-hole conductor layers are formed on both surfaces of the printed wiring board 7.
The ground conductor layers 12 and 13 are connected to the ground circuit of the printed wiring board 7.

With the above-mentioned structure, the grounding circuit of the printed wiring board 7 and the conductor 11 on the inner surface of the housing body 6 come into contact with each other when they are tightened and mounted by the mounting screw 9, and the ground potential of the same potential is obtained. Since it is connected to the housing main body 6 side of the printed wiring board 7, signals are not led in or out of the external space. That is, it is in a state of being electrically shielded.

As shown in FIG. 8 (b), one of the metal leaf springs 15 for grounding is arranged on the surface of the grounding spring mounting protrusion 14 formed integrally inside the keyboard portion 3. , And is fixed by attaching screws 16 such as tapping screws. The positions of the protrusions 14 formed on the keyboard portion 3 side are different from the positions of the protrusions 8 formed on the housing body 6 side.

Since the conductor 17 which is a metallized layer of Cu or the like is formed on the entire inner surface of the keyboard portion 3 including the end faces of the protrusions 14, the grounding plate is tightened by the mounting screw 16. The spring 15 contacts the conductor 17 on the inner surface of the keyboard portion 3 and is connected to the same potential state.

As shown in FIG. 1B, when the housing body 6 and the keyboard portion 3 are combined and brought into a combined state, the tip side of the grounding leaf spring 15 is placed on the printed wiring board 7.
Elastically contacting the ground conductor layer 12 of.

By making such contact, the conductor 17 on the inner surface of the keyboard portion 3 is connected to the ground potential of the same potential of the ground circuit of the printed wiring board 7, and the keyboard portion of the printed wiring board 7 is connected. With respect to 3, the signal is not led in or out of the external space. That is, although it is in an electrically shielded state, both sides of the printed wiring board 7 are shielded because the casing body 6 side is also shielded.

FIG. 9 is a side sectional view showing another conventional mounting structure of a printed wiring board in the electronic device 1, and only a main part thereof is shown in a schematic structure. 9A is the same as FIG. 8A, and the apparatus main body 2 made of a synthetic resin molding comprises a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. The detailed structure of the keyboard portion 3 itself is not shown.

The printed wiring board 7 is arranged on a printed wiring board mounting protrusion 8 which is integrally formed inside the housing body 6, and is mounted and fixed by a mounting screw 9 made of a plastic screw such as a tapping screw. .

On the inner surface of the housing body 6, a conductor 11 which is a metallized layer of Cu or the like is formed on the entire inner surface including the end surfaces of the protrusions 8. Ground conductor layers 12 connected by through-hole conductor layers on both sides of the printed wiring board 7,
13 is formed, and the ground conductor layers 12 and 13 are connected to the ground circuit of the printed wiring board 5.

With the above-mentioned structure, the grounding circuit of the printed wiring board 7 and the conductor 11 on the inner surface of the housing body 6 come into contact with each other by being tightened and mounted by the mounting screw 9, and the grounding potential of the same potential. Since it is connected to the housing main body 6 side of the printed wiring board 7, signals are not led in or out of the external space. That is, it is electrically shielded.

As shown in FIG. 9B, a protrusion 18 for contacting and connecting a printed wiring board is provided inside the keyboard portion 3.
Are integrally formed. On the inner surface of the keyboard portion 3, a conductor 17 that is a metallized layer such as Cu is provided with a protrusion 18
Is formed on the entire inner surface including the end surface of. The position of the protrusion 18 formed on the side of the keyboard portion 3 is such that the housing body 6
It is formed at a position different from the position of the protrusion 8 formed on the side.

Corresponding to the protrusion 18 on the keyboard portion 3 side, a protrusion 19 for printed wiring board contact connection is integrally formed on the housing body 6 side, and the conductor 11 is also formed on the end face of this protrusion 19. Therefore, the surface of the ground conductor layer 13 of the printed wiring board 7 attached to the housing body 6 is in a state where it can contact the end surface conductor 11 of the protrusion 19.

As shown in FIG. 2B, when the housing body 6 and the keyboard portion 3 are combined and brought into a combined state, the end surface of the protrusion 18 on the keyboard portion 3 side is the ground conductor of the printed wiring board 7. The layer 12 can be contacted.

A mounting screw 21 made of a plastic screw such as a tapping screw is inserted from the outside of the projection 19 of the housing body 6 through the hole in the recess, and the keyboard portion 3 of the keyboard portion 3 is inserted through the hole of the printed wiring board 7. Screw on the protrusion 18 and tighten.

In this manner, by tightening and fixing the mounting screw 21, the end surface of the protrusion 19 of the housing body 6 contacts the ground conductor layer 13 of the printed wiring board 7, and the end surface of the protrusion 18 of the keyboard portion 3 is printed wiring board. 7 to the ground conductor layer 12. As a result, the conductor 11 on the housing body 6 side and the conductor 17 on the keyboard portion 3 side are connected via the ground conductive layers 12 and 13 of the printed wiring board 7, and the printed wiring board 7 is housed. It is electrically shielded by the conductor 11 of the body 6 and the conductor 17 of the keyboard portion 3.

[0022]

Although not shown, the housing body 6 and the keyboard portion 3 are integrally coupled to each other by attaching them by screws or the like to maintain a mechanically stable attachment structure. It is done.

However, the ground circuit of the printed wiring board 7 for shielding the shield of the printed wiring board 7, the conductor 11 of the housing body 6 and the conductor 17 of the keyboard portion 3 are used.
Conventionally, the above-described structure has been used to electrically connect and to.

Such a connection structure is electrically unstable with respect to the printed wiring board 7 if it is grounded at only one place. Therefore, in order to obtain a stable shielding state, it is usually effective at a plurality of places. It is necessary to arrange it at a key point.

Therefore, in the structure shown in FIG. 8, since the ground conductor layer 12 of the printed wiring board 7 and the leaf spring 15 on the side of the keyboard portion 3 are merely elastic contacts, the keyboard portion 3 and the casing are connected. Although it can be easily attached to and detached from the body body 6, it is necessary to secure a space for making contact with the mounting position of the leaf spring 15, which has a considerable influence on high-density mounting of the electronic device 1. It was

In the structure shown in FIG. 9, since the screws 21 are tightened by the mounting screws 21, the connection between the housing body 6 side and the keyboard portion 3 side is not only elastic connection but reliable pressure contact connection. Since they are connected at the same place, it is electrically convenient, but again, a space is required other than the place where the printed wiring board 7 is attached to the housing body 6. Also, the attachment and detachment of the attachment screw 21 is required to attach and detach the keyboard portion 3, which is troublesome.

Furthermore, according to the structure of FIG.
It is said that the positioning state by screwing (not shown) required for the connection between the keyboard part 3 and the keyboard part 3 and the positioning state by the connection by sandwiching the printed wiring board 7 between the protrusions 18 and 19 are not constant due to mutual dimensional error. There are also problems.

In view of the above problems of the conventional structure, the present invention provides an electronic device capable of effectively connecting the conductor covering the printed wiring board and the ground potential of the printed wiring board. Is the purpose of.

[0029]

According to the gist of the constitution of the present invention for solving the above problems, basically, the printed wiring board is connected to the ground potential of the printed wiring board and the printed wiring board is connected to the main body of the housing. An electronic device in which a head of a mounting screw to be mounted and a conductor that electrically covers the printed wiring board are electrically connected.

According to a preferred first aspect thereof, a conductive elastic body is interposed between the mounting screw head and a conductor for electrically covering the printed wiring board. According to the second aspect, the conductive elastic body is made of rubber.

According to the third aspect, the conductive elastic body is a spring. According to the fourth aspect, the housing body is electrically connected to the printed wiring board at a mounting screw portion to which the printed wiring board is attached.

[0032]

According to the basic constitution of the above-mentioned constitution means of the present invention, the conductor for electrically covering and shielding the printed wiring board is electrically connected to the head of the mounting screw for attaching the printed wiring board to the housing body. Therefore, no special space is required on the conventional printed wiring board.

According to the first aspect, the conductive elastic body is interposed between the conductor that covers and shields the printed wiring board and the head of the mounting screw for mounting the printed wiring board. Can be flexibly accommodated and can be easily attached and detached.

According to the second aspect, since the conductive elastic body is made of rubber, a large contact area can be obtained and an effective contact connection state can be obtained. According to the third aspect, by using the conductive elastic body as a spring, a reliable electrical contact connection state can be obtained.

According to the fourth aspect, the conductor covering the printed wiring board can be directly electrically connected via the conductive surface on the housing body side and the mounting screw portion.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The electronic device of the present invention will be described in detail below with reference to the drawings by way of specific embodiments. It should be noted that the same parts are denoted by the same reference numerals throughout the drawings.
Note that the embodiment of the present invention will be described as being applied to the electronic device 1 shown in FIG. 7.

FIG. 1A is a side sectional view showing a printed wiring board mounting structure of the electronic device 1 according to the first embodiment of the present invention, and only a main part thereof is shown in a schematic structure. As shown in the figure, the apparatus main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 7 is arranged on a printed wiring board mounting protrusion 8 which is integrally formed inside the housing body 6, and is mounted and fixed by a mounting screw 9 made of a plastic screw such as a tapping screw. .

On the inner surface of the case body 6, the conductor 1 is a metallized layer of Cu (copper) or the like formed by electroless plating.
1 is formed on the entire inner surface including the end surface of the protrusion 8.
Ground conductor layers (copper foil patterns) 12, 13 connected by through-hole conductor layers are provided on both sides of the printed wiring board 7.
Are formed, and the ground conductor layers 12 and 13 are connected to the ground circuit of the printed wiring board 7.

Mounting screw 9 and plain washer;
The spring washers and the like are all alloys of known copper-based materials, and the surface thereof is plated with Ni, for example, to provide good conductivity.

With the above-described structure, the grounding circuit of the printed wiring board 7 and the conductor 11 on the inner surface of the housing body 6 are connected by tightening and mounting with the mounting screw 9, and the grounding potential of the same potential is obtained. Since it is connected to the housing main body 6 side of the printed wiring board 7, signals are not led in or out of the external space. That is, it is in a state of being electrically shielded.

A concave hole 26 having a circular opening surface is formed inside the protrusion 25 integrally formed inside the keyboard portion 3 at a position corresponding to the position of the protrusion 8 on the housing body 6. . The diameter of the recessed hole 26 is large enough to fit the head of the mounting screw 9.

Inside the keyboard portion 3, a conductor 17, which is a metallized layer such as Cu, is formed on the entire inner surface including the inner surface of the recessed hole 26. Then, the entire conductive elastic body 28 is pushed into the inside of the recessed hole 26 with an appropriate pressure that does not naturally come out, and comes into contact with the conductors 17 on the bottom surface and the side surface in the recessed hole 26. ing.

As shown in the side view of FIG. (B) and the front view of FIG. (C), the conductive elastic body 28 is basically cylindrical and the middle portion of the outer periphery is a small diameter portion 29. There is a large diameter portion 31 on both ends. Through hole 3 that penetrates through the center
2 is formed.

The conductive elastic body 28 has the above-described shape, and its material is, for example, a relatively soft silicone-based synthetic rubber mixed with a conductive material such as metal powder or carbon powder. , Or a mixture of metal wires that are flexible and have low electrical resistance, or a mesh of metal wires that are flexible and have low electrical resistance around rubber
Can be appropriately selected and applied from those surrounded by.

Therefore, the conductive elastic body 28 is in contact with the conductive body 17 on the inner surface of the keyboard portion 3 to be connected to the same potential state. As shown in FIG. (A), the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other so that they are united and integrally coupled. When the top surface of the head of the mounting screw 9 is pressed against the surface of the conductive elastic body 28, the conductive elastic body 28 is elastically deformed so as to be pushed into the concave hole 26.
The space for this elastic deformation is the small diameter portion 29 and the through hole 32.
Since it is given by and, the deformation can be performed extremely easily.

In this manner, the head of the mounting screw 9 and the conductive elastic body 28 are brought into pressure contact with each other, so that the conductive elastic body 28 is attached to the head of the mounting screw 9, the spring washer, the flat washer, and Ground conductor layers 12, 13 of printed wiring board 7
Electrically connected to the conductor 11 of the housing body 6 via
Due to the elastic restoring force due to the compressive deformation of the conductive elastic body 28, the electrically connected state is more securely and firmly established.

That is, the conductor 11 of the housing body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the same potential as the ground potential of the printed wiring board 7. In this state, both sides of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to the present embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space and the like.
Since it is performed by pressure contact between the mounting screw 9 head and the conductive elastic body 28, when removing the keyboard portion 3, it is easy to release the elastic engagement between the peripheral hook-shaped portions 33, 34. Can be done.

Further, the conductive elastic body 28 is the keyboard portion 3
Since it is entirely accommodated in the recessed hole 26 of the projection 25, even if it is pressed against the head of the mounting screw 9, its position does not shift laterally due to its elastic deformation. Stable and accurate positioning. Although the whole is accommodated in the recessed hole 26, the small diameter portion 29 and the through hole 32 allow the elastic deformation to be easily performed without causing stress.

The contact between the conductive elastic body 28 and the head of the mounting screw 9 is expected to accelerate the contact area with an increase in the pressing deformation amount, which leads to the improvement of the electrical connection reliability. Become.

FIG. 2 is a side sectional view of the printed wiring board mounting structure of the electronic device 1 according to the second embodiment of the present invention, the main part of which is shown in a schematic structure. As shown,
The device main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 7, mounting screws 9, conductors 11, and the like on the housing body 6 side in this embodiment.
Since the configuration of the above is the same as that described with reference to FIG. 1, the description thereof is omitted here, and the same reference numerals are given in the figure, so that the configuration may be referred to with the above description as necessary.

At the position corresponding to the position of the protrusion 8 of the housing main body 6, a concave hole 36 having a circular opening surface is formed inside the protrusion 35 integrally formed inside the keyboard portion 3. . The diameter of the recessed hole 36 is appropriately larger than the diameter of the head of the mounting screw 9.

On the inner surface of the keyboard portion 3, a conductor 17, which is a metallized layer such as Cu, is formed on the entire inner surface including the inner surface of the recessed hole 36. Then, the end portion of the conductive elastic body 38 is pressed into the inside of the recessed hole 36 with an appropriate pressure so as not to come out naturally, and comes into contact with the bottom and side surface conductors 17 in the recessed hole 36. are doing.

The conductive elastic body 38 is basically cylindrical, and has a concave surface portion 39 having a shape suitable for the head portion of the mounting screw 9 to be fitted into the tip end thereof, and a through hole 41 in the center thereof. ing.

The conductive elastic body 38 has the above-mentioned shape, and the material thereof is, for example, a relatively soft silicone synthetic rubber mixed with a conductive material such as metal powder or carbon powder. , Or a mixture of metal wires that are flexible and have low electrical resistance, or a mesh of metal wires that are flexible and have low electrical resistance around rubber
Can be appropriately selected and applied from those surrounded by.

Therefore, the conductive elastic body 38 is brought into contact with the conductor 17 on the inner surface of the keyboard portion 3 to be connected to the same potential state. As shown in the drawing, the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other to be united and integrally coupled, so that the mounting screw 9 When the upper surface of the head is fitted and pressed against the concave surface portion 39 of the conductive elastic body 38, the conductive elastic body 38 is elastically deformed so as to be pressed into the concave hole 36. Since the space for this elastic deformation is provided by the open portion around the cylindrical shape and the through hole 41, the deformation can be easily performed without difficulty.

In this manner, the head of the mounting screw 9 and the concave surface portion 39 of the conductive elastic body 38 are brought into pressure contact with each other, so that the conductive elastic body 38 is attached to the head of the mounting screw 9, the spring washer, It is electrically connected to the conductor 11 of the housing body 6 through the flat washer and the ground conductor layers 12 and 13 of the printed wiring board 7, and is electrically connected by the elastic restoring force due to the compressive deformation of the conductive elastic body 38. The situation is solid and reliable.

That is, the conductor 11 of the casing body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the same potential as the ground potential of the printed wiring board 7. This means that both sides of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to this embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space.
Since it is performed by pressure contact between the mounting screw 9 head and the conductive elastic body 38, when the keyboard portion 3 is removed, it is easy to release the elastic engagement between the peripheral hook-shaped portions 33, 34. Can be done.

The conductive elastic body 38 has a concave surface portion 39.
Since the mounting screw 9 and the head of the mounting screw 9 are just fitted to each other, even if the mounting screw 9 is pressed and contacted, its position does not shift in the lateral direction due to its elastic deformation.
Stable and accurate positioning is performed, and elastic deformation is easily performed by the peripheral open portion and the through hole 41 without causing stress.

The contact between the conductive elastic body 38 and the head of the mounting screw 9 is increased with an increase in the pressing deformation amount, and the contact surface pressure is accelerated to ensure the reliability of electrical connection. Becomes

FIG. 3 is a side sectional view of the printed wiring board mounting structure of the electronic device 1 according to the third embodiment of the present invention, the main part of which is shown in a schematic structure. As shown,
The device main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 7, the mounting screw 9, the conductor 11, and the housing body 6 side in this embodiment are
Since the configuration such as is similar to that described in FIG. 1,
The description here is omitted, and the same reference numerals are given in the drawings, so refer to the above description as necessary.

At the position corresponding to the position of the protrusion 8 of the housing body 6, a circular recess 36 having an opening surface is formed inside the protrusion 35 integrally formed inside the keyboard portion 3. . The diameter of the recess 36 is appropriately slightly larger than the diameter of the head of the mounting screw 9.

On the inner surface of the keyboard portion 3, a conductor 17, which is a metallized layer of Cu or the like, is formed on the entire inner surface including the inner surface of the recess 36. Then, the end portion of the conductive elastic body 48 is pushed into the inside of the recess hole 36 with an appropriate pressure so as not to come out naturally, and comes into contact with the bottom and side surface conductors 17 in the recess hole 36. are doing.

The conductive elastic body 48 is cylindrical and has a through hole 49 formed in the center thereof. This conductive elastic body 4
A concave hole 52 of one of the receiving metal fittings 51 having a circular shape in a plan view and an H shape in a side cross-section is fitted to the tip of 8. The other recessed hole 5
Reference numeral 3 has an inner diameter suitable for fitting the heads of the mounting screws 9. A vent hole 54 is formed in the center of the wall surface of the bottom part that divides the recessed holes 52, 53.

The inner diameters of the recessed holes 52 and 53 of the receiving metal fitting 51 are the same as the inner diameters of the recessed holes 36 of the projections 35, and they fit into the conductive elastic body 48 and do not naturally come out, and the bottom surface and the side surface. And are in contact with the conductive elastic body 48. Further, since the depth is the same, the assembly can be performed in any direction without any direction. The material of the receiving metal fitting 51 is aluminum alloy or copper alloy N
It has low electrical resistance such as i-plating.

The conductive elastic body 48 has the above-mentioned shape, and the material thereof is, for example, a relatively soft silicone-based synthetic rubber mixed with a conductive material such as metal powder or carbon powder. , Or a mixture of metal wires that are flexible and have low electrical resistance, or a mesh of metal wires that are flexible and have low electrical resistance around rubber
Can be appropriately selected and applied from those surrounded by. Therefore, the conductive elastic body 48 is connected to the conductor 17 on the inner surface of the keyboard portion 3 to be connected to the same potential state, and the receiving metal fitting 51 is also the same.

As shown in the figure, the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other so that they are united and integrally coupled.
When the upper surface of the head of the mounting screw 9 is pressed against the concave hole 53 of the receiving metal fitting 51 at the tip of the conductive elastic body 48, the conductive elastic body 48 is pressed into the concave holes 36 and 52. Is elastically deformed. Since the space for this elastic deformation is provided by the open portion around the cylindrical shape and the through hole 49, the deformation can be easily performed without difficulty.

In this way, the head of the mounting screw 9 and the recessed hole 53 of the receiving metal fitting 51 are brought into pressure contact with each other, whereby the receiving metal fitting 51 has the head of the mounting screw 9, a spring washer, a flat washer, and Ground conductor layers 12, 13 of printed wiring board 7
Is electrically connected to the conductor layer 11 of the housing body 6 via
Due to the elastic restoring force due to the compressive deformation of the conductive elastic body 48, the electrically connected state is reliably and firmly established.

That is, the conductor 11 of the casing body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the same potential as the ground potential of the printed wiring board 7. This means that both sides of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to the present embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space.
Mounting screw 9 head and receiving metal fitting 51 for conductive elastic body 48
Since the keyboard portion 3 is removed by pressure contact, the removal of the keyboard portion 3 can be easily performed by only releasing the elastic engagement between the peripheral hook-shaped portions 33 and 34.

Further, since the receiving metal fitting 51 of the conductive elastic body 48 has a relationship in which the recessed hole 53 and the head of the mounting screw 9 are just fitted to each other, even if the mounting screw 9 is pressed and contacted, the conductive elastic body The body 48 is stably and accurately positioned without being laterally displaced due to elastic deformation of the body 48, and is easily elastically deformed by the surrounding open portion and the through hole 49 without causing any stress.

The contact between the conductive elastic body 48 and the head of the mounting screw 9 is increased with an increase in the pressing deformation amount, and the contact surface pressure is accelerated to ensure the reliability of the electrical connection. Becomes

As the conductive elastic body 48 is elastically deformed, the air in the through hole 49 is compressed, but it is not compressed by the ventilation hole 54 of the receiving fitting 51, and the air is easily distributed. Is performed.

Further, when the conductive elastic body 48 is compressed and deformed, the diameter thereof increases in the outer peripheral direction thereof. As a result, the pressure contact force to the concave hole 36 of the projection 35 and the inner surface of the concave hole 52 of the receiving fitting 51 is increased. Therefore, the electrical contact state between the conductive elastic body 48 and the protrusion 35 and the receiving metal fitting 51 is further improved. This means that the contact between the receiving metal fitting 51 and the head of the mounting screw 9 is metal-to-metal contact, so that a good result can be obtained for the electrical connection between the conductors 11 and 17 as a whole.

FIG. 4 is a side sectional view of the printed wiring board mounting structure of the electronic device 1 according to the fourth embodiment of the present invention, the main part of which is shown in a schematic structure. As shown,
The device main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 7, the mounting screw 9, the conductor 11,
Since the configuration such as is similar to that described in FIG. 1,
The description here is omitted, and the same reference numerals are given in the drawings, so refer to the above description as necessary.

A cylindrical protrusion 55 is integrally formed inside the keyboard portion 3 at a position corresponding to the position of the protrusion 8 of the housing body 6. Inside the keyboard portion 3, a conductor 17 which is a metallized layer of Cu or the like is formed on the entire inner surface including the periphery of the protrusion 55. This protrusion 5
The concave hole 59 of the conductive elastic body 58 is pressed into the portion 5 with an appropriate pressure so that the conductive elastic body 58 does not come out naturally, and the tip surface and the inner peripheral surface of the concave hole 59 are in contact with the conductor 17.

The conductive elastic body 58 is basically cylindrical, and the vent hole 61 is provided at the bottom of the recessed hole 59. When the conductive elastic body 58 is pushed into the projection 55, as shown in the drawing, the bottom of the recessed hole 59 and the projection 55 are removed.
An appropriate gap is formed between the end surface of the and.

The conductive elastic body 58 has the above-mentioned shape, and the material thereof is, for example, a relatively soft silicone-based synthetic rubber mixed with a conductive material such as metal powder or carbon powder. , Or a mixture of metal wires that are flexible and have low electrical resistance, or a mesh of metal wires that are flexible and have low electrical resistance around rubber
Can be appropriately selected and applied from those surrounded by. Therefore, the conductive elastic body 58 is brought into contact with the conductor 17 on the inner surface of the keyboard portion 3 to be connected to the same potential state.

As shown in the drawing, the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other to be united and integrally coupled.
When the top surface of the head of the mounting screw 9 contacts and is pressed against the tip surface of the conductive elastic body 58, the conductive elastic body 58 is pressed against the inner surface of the keyboard portion 3 and elastically deformed and compressed. The space for this elastic deformation is the tip surface of the protrusion 55,
Since it is provided by the gap formed between the bottom surfaces of the recessed holes 59 of the conductive elastic body 58, the deformation can be easily performed without difficulty.

In this way, the head portion of the mounting screw 9 and the tip end surface of the conductive elastic body 58 are brought into pressure contact with each other,
The conductive elastic body 58 includes the head of the mounting screw 9, a spring washer, a flat washer, and the ground conductor layer 1 of the printed wiring board 7.
It is electrically connected to the conductor layer 11 of the housing body 6 via 2 and 13, and the elastic connection force due to the compressive deformation of the conductive elastic body 58 ensures a reliable and electrically connected state.

That is, the conductor 11 of the casing body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the same potential as the ground potential of the printed wiring board 7. This means that both sides of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to this embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space.
Since it is performed by pressure contact between the head portion of the mounting screw 9 and the conductive elastic body 58, when the keyboard portion 3 is removed, it is easy to release the elastic engagement between the hook-shaped portions 33 and 34 in the surroundings. Can be done.

Since the tip end surface of the conductive elastic body 58 is aligned with the head portion of the mounting screw 9, and the concave hole 59 is fitted in the projection 55 to guide the positioning. Even if pressed against the mounting screw 9,
The elastic deformation ensures stable and accurate positioning without lateral displacement, and the perimeter is open, which is impossible due to the gap between the bottom of the recessed hole 59 and the tip surface of the projection 55. Elastic deformation is easily carried out without occurring.

By compressing and deforming this gap, the air inside is compressed, but without being compressed, it is easily circulated to the outside through the vent hole 61 at the bottom of the recess 59. The contact area between the conductive elastic body 58 and the head of the mounting screw 9 is increased with an increase in the pressing deformation amount, the contact area is accelerated, and the electrical connection reliability is improved and becomes reliable. .

FIG. 5 is a side sectional view of the printed wiring board mounting structure of the electronic device 1 according to the fifth embodiment of the present invention, in which only the main part is shown in a schematic structure. As shown,
The device main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 9, mounting screws 9, conductors 11, and the like on the housing body 6 side in this embodiment.
Since the configuration such as is similar to that described in FIG. 1,
The description here is omitted, and the same reference numerals are given in the drawings, so refer to the above description as necessary.

At a position corresponding to the position of the projection 8 of the housing body 6, a circular opening 66 is formed inside the projection 65 integrally formed inside the keyboard portion 3. . The diameter of the recessed hole 66 is slightly larger than the diameter of the head of the mounting screw 9.

On the inner surface of the keyboard portion 3, a conductor 17 which is a metallized layer of Cu or the like is formed on the entire inner surface including the inner surface of the recessed hole 66. Then, the end portion of the conductive elastic body 68 is pushed into the inside of the recess hole 66 with an appropriate pressure so as not to come out naturally, and comes into contact with the bottom and side surface conductors 17 in the recess hole 66. are doing.

The conductive elastic body 68 is a circularly wound compression coil spring of equal diameter, and both ends thereof are formed on flat seat surfaces orthogonal to the central axis. This conductive elastic body 68
At the tip of the, the receiving bracket 7 is circular in plan view and H-shaped in side cross section.
One of the recessed holes 72 is fitted. The other recessed hole 6
Reference numeral 3 has an inner diameter suitable for fitting the heads of the mounting screws 9.

The inner diameters of the recessed holes 72 and 73 of the receiving metal fitting 71 are the same as the inner diameters of the recessed holes 66 of the projection 65, and they fit into the conductive elastic body 68, and the bottom surface and the side surface do not come out naturally. And are in contact with the conductive elastic body 68. Further, since the depth is the same, the assembly can be performed in any direction without any direction. Such non-directionality is the same for the conductive elastic body 68.

The material of the conductive elastic body 68 is preferably a spring material of a copper-based alloy, for example, a nickel silver wire for springs, a phosphor bronze wire for springs, etc., and Ni plating or the like is applied if necessary. It has a low electrical resistance.

The material of the receiving metal fitting 71 is made of aluminum alloy or copper alloy such as Ni plating and has a low electric resistance. Since the conductive elastic body 68 is in contact with the conductor 17 on the inner surface of the keyboard portion 3,
The receiving metal fittings 71 are connected in the same potential state, and the same applies.

As shown in the drawing, the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other so that they are united and integrally coupled.
When the upper surface of the head of the mounting screw 9 is pressed against the receiving metal fitting 71, the conductive elastic body 68 is pressed into the recessed holes 66 and 72 and is elastically deformed. The space for this elastic deformation is provided by the gap between the end surface of the projection 65 and the end surface of the receiving member 71, so that the deformation can be easily performed without difficulty.

In this way, the head of the mounting screw 9 and the recessed hole 73 of the receiving metal fitting 71 are brought into pressure contact with each other, so that the receiving metal fitting 71 has the head of the mounting screw 9, a spring washer, a flat washer, and Ground conductor layers 12, 13 of printed wiring board 7
Electrically connected to the conductor 11 of the housing body 6 via
Due to the elastic restoring force due to the compressive deformation of the conductive elastic body 68, the electrically connected state is securely and firmly established.

That is, the conductor 11 of the housing body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the same potential as the ground potential of the printed wiring board 7. In this state, both ends of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to this embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space.
Mounting screw 9 head and receiving metal fitting 71 for conductive elastic body 68
Since the keyboard portion 3 is removed by pressure contact, the removal of the keyboard portion 3 can be easily performed by only releasing the elastic engagement between the peripheral hook-shaped portions 33 and 34.

Further, in the receiving metal fitting 71 of the conductive elastic body 68, since the recessed hole 73 and the head of the mounting screw 9 are just fitted to each other, even if the mounting screw 9 is pressed and contacted, the conductive elastic body 68 is made of conductive elastic material. The body 68 is stably and accurately positioned without being laterally displaced due to elastic deformation of the body 68, and elastic deformation is easily performed by the surrounding gap space without causing stress.

The contact surface pressure of the conductive elastic body 68 is linearly increased as the amount of pressing deformation due to the contact of the mounting screw 9 increases, and the electrical connection reliability is ensured.

When the conductive elastic body 68 is compressed and deformed, its diameter increases in the outer peripheral direction thereof. As a result, the pressure contact force of the concave hole 66 of the projection 65 and the inner surface of the concave hole 72 of the receiving metal fitting 71 increases. As a result, the electrical contact state between the conductive elastic body 68 and the projection 65 and the receiving metal fitting 71 becomes even better. This means that the contact between the metal fitting 71 and the head of the mounting screw 9 is metal-to-metal contact, and the conductive elastic body 68 is also metal, so that the electrical connection between the conductors 11 and 17 as a whole. Good results are obtained for connection.

FIG. 6 is a printed wiring board mounting structure of the electronic device 1 of the sixth embodiment of the present invention, and FIG. 6A is a side sectional view showing a schematic structure of only a main part thereof. As shown in the figure, the apparatus main body 2 made of a synthetic resin molded product is composed of a housing main body 6 and a keyboard portion 3 covering the upper surface thereof. Note that the detailed structure of the keyboard portion 3 itself is omitted in the drawing as in the prior art.

The printed wiring board 7, the mounting screw 9, the conductor 11,
Since the configuration such as is similar to that described in FIG. 1,
The description here is omitted, and the same reference numerals are given in the drawings, so refer to the above description as necessary.

Columnar protrusions 75, 75 are integrally formed at two positions inside the keyboard portion 3 at positions corresponding to the positions of the protrusions 8 of the housing body 6. Keyboard part 3
A conductor 17 which is a metallized layer of Cu or the like is formed on the entire inner surface including the surface of the protrusion 75. Then, the engaging claws 81 of the leg portions 79 on both sides of the conductive elastic body 78 are pushed into the protrusions 75 and are locked so as not to come out. Is in contact with.

The conductive elastic body 78 is a strip-shaped leaf spring, and the central concave surface 82 is curved so that the head can be received along the head of the mounting screw 9, and both sides thereof are corrugated. The compression springs 83, 83 are formed, and the tips are formed as leg portions 79.

As shown in the side sectional view of FIG. (B) and the plan view of FIG. (B) shown in FIG. (C), the engaging claws 81 are arranged along the circumference of the cylindrical protrusion 75. The three claws 84 are cut and bent to form a curved shape, and the inner diameters of the three claws 84 in plan view are appropriately smaller than the diameter of the protrusion 75, so that the elasticity of the three claws 84 when pushed into the protrusion 75 is increased. Is expanded to the outer diameter of the protrusion 75, is engaged, and is pressed into the state shown in the figure. Claw 84 when pushed
The inner diameter end of the bite bites into the peripheral surface of the protrusion 75,
You will never get out. The surface of the leg 79 is pressed against the conductor 17 by the reaction force of the elastic force.

The material of the conductive elastic body 78 is preferably a spring material of a copper alloy, for example, a nickel silver plate for springs, a phosphor bronze plate for springs, etc., and Ni plating or the like is applied if necessary. It has low electrical resistance.

The conductive elastic body 78 is in contact with the conductor 17 on the inner surface of the keyboard portion 3 to be connected to the same potential state. As shown in the drawing, the hook-shaped portion 33 around the housing body 6 and the hook-shaped portion 34 around the keyboard portion 3 are elastically engaged with each other to be united and integrally coupled,
When the top surface of the head of the mounting screw 9 is pressed against the conductive elastic body 78, the conductive elastic body 78 is pressed against the conductive body 17 and is elastically deformed. This elastic deformation causes two compression springs 8
By 3,83, deformation can be easily performed in a stable state without difficulty.

In this manner, the head of the mounting screw 9 and the conductive elastic body 78 are brought into pressure contact with each other, so that the conductive elastic body 78 is attached to the head of the mounting screw 9, the spring washer, the flat washer, and Ground conductor layers 12, 13 of printed wiring board 7
Is electrically connected to the conductor 11 of the housing body 6 via
Due to the elastic restoring force due to the compressive deformation of the conductive elastic body 78, the electrically connected state is securely and firmly established.

That is, the conductor 11 of the housing main body 6 and the conductor 17 of the keyboard portion 3 are electrically connected, and these conductors 11 and 17 are connected to the ground potential of the printed wiring board 7 at the same potential. In this state, both ends of the printed wiring board 7 are electrically shielded, so that signals cannot be led in and out of the external space with respect to the printed wiring board 7.

As described above, according to this embodiment, the electrical connection between the conductor 17 of the keyboard portion 3 and the conductor 11 of the housing body 6 does not require a special space.
Since it is performed by pressure contact between the head of the mounting screw 9 and the conductive elastic body 78, when removing the keyboard part 3, it is easy to release the elastic engagement between the hook-shaped parts 33 and 34 of the surroundings. Can be done.

The concave surface 82 at the center of the conductive elastic body 78 is
Since the mounting screw 9 is bent and the head portion of the mounting screw 9 is just received, even if the mounting screw 9 is pressed and contacted, the conductive elastic body 78 is elastically deformed and the position thereof is not displaced in the lateral direction. Positioned accurately. Since the compression springs 83, 83 are symmetrically arranged on both sides, the compression deformation of a stable posture is also performed.

The contact surface pressure of the conductive elastic body 78 is linearly increased with an increase in the pressing deformation amount due to the contact of the mounting screw 9, and the electrical connection reliability is ensured.

Since the contact between the conductive elastic body 78 which is a metal and the head of the mounting screw 9 is a metal-to-metal contact, a good result is obtained in the electrical connection between the conductors 11 and 17.

As described above, the electronic device of the present invention is not limited to the respective embodiments and can be applied not only to those which are portable but also to the case not limited to the keyboard part. It is composed of etc. It may be a metal casing other than the synthetic resin molded product.

It is not always necessary to interpose the conductive elastic body, and it is also included to make direct contact connection. As for the spring, a synthetic resin having conductivity, for example, a synthetic resin molded product to which a conductive coating film of metal or the like is adhered may be used in addition to the metal spring.

[0120]

As described above in detail, according to the electronic device of the present invention, the electrical connection between the conductor surrounding the printed wiring board and the printed wiring board is fixed by the mounting screw for attaching the printed wiring board to the housing body. By connecting it to the head, it can be done without requiring a special space.

By interposing a conductive elastic body between the conductor covering the printed wiring board and the mounting screw head for mounting the printed wiring board, it is possible to flexibly cope with the gap error.

When the conductive elastic body is made of rubber, a large contact area can be obtained and an effective contact connection state can be obtained. By using the conductive elastic body as a spring, a reliable electrical contact connection state can be obtained.

The conductor covering the printed wiring board is brought into direct electrical connection with the conductor surface on the housing body side through the mounting screw portion of the printed wiring board so that the entire surface of the printed wiring board is covered. It will be electrically covered.

As described above, it is suitable for downsizing and high-density mounting of an electric device, and the conductor covering the printed wiring board and the ground potential of the printed wiring board are effectively connected to each other in practical use. The effect is extremely remarkable.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a schematic sectional view of a main part of a third embodiment of the present invention.

FIG. 4 is a schematic sectional view of an essential part of a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of a main part of a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view of a main part of a sixth embodiment of the present invention.

FIG. 7 is an external perspective view of an electronic device.

FIG. 8 is a conventional mounting structure (No. 1) for a printed wiring board.

FIG. 9 is a conventional mounting structure (No. 2) for a printed wiring board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic device 2 Device main body 3 Keyboard part 5 Display part 6 Housing body 7 Printed wiring board 8 Protrusion 9 Mounting screw 11 Conductor 12, 13 Ground conductor layer 17 Conductor 25 Protrusion 26 Recessed hole 28 Conductive elastic body 29 Small diameter Part 31 Large diameter part 32 Through hole 33, 34 Hook-like part 35 Protrusion 36 Recessed hole 38 Conductive elastic body 39 Concave surface part 41 Through hole 48 Conductive elastic body 49 Through hole 51 Receiving metal fitting 52, 53 Recessed hole 54 Vent hole 55 Protrusion 58 Conductive elastic body 59 Recessed hole 61 Vent hole 65 Protrusion 66 Recessed hole 68 Conductive elastic body 71 Receiving metal fitting 72,73 Recessed hole 75 Protrusion 78 Conductive elastic body 79 Leg portion 81 Engaging claw 82 Concave surface 83 Compression spring 84 nail

Claims (5)

[Claims] 1. A head of a mounting screw, which is connected to the ground potential of the printed wiring board to attach the printed wiring board to the housing body, and a conductor that electrically covers the printed wiring board are electrically connected. An electronic device characterized by the above. 2. The electronic device according to claim 1, wherein a conductive elastic body is interposed between the mounting screw head and a conductor that electrically covers the printed wiring board. 3. The electronic device according to claim 2, wherein the conductive elastic body is made of rubber. 4. The electronic device according to claim 2, wherein the conductive elastic body is a spring. 5. The electronic device according to claim 1, wherein the housing body is electrically connected to the printed wiring board at a mounting screw portion to which the printed wiring board is attached.