JP2000207060A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide electronic equipment capable of increasing electric conduction between a housing and a shield plate and improving the shield effect against electromagnetic noise. SOLUTION: A portable computer 1 is provided with a housing 4 having a top cover 11 where a keyboard attaching hole 13 is opened, a keyboard 18 mounted on the keyboard attaching hole, a circuit board 28 housed in the housing, plural screws 42 which go through terminal parts 30a and 30b for ground of the circuit board and arranged while connecting a base with the top cover and a metallic shield plate 60 covering the circuit board. The base and the top cover have plural seats 34 and 40 projecting toward the terminal parts of the circuit board, and the terminal parts of the circuit board are held by the seats. Also, the shield plate has plural conductive pieces 70 intervened between the terminal parts of the circuit board and the seats of the top cover and is also attached to the top cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as a portable computer, and more particularly to a structure for enhancing electrical continuity between a housing and a shield plate.

[0002]

2. Description of the Related Art A portable computer includes a computer body having a keyboard and a display unit supported by the computer body. The computer main body has a box-shaped housing, and an MPU: microprocessing unit is mounted on a circuit board housed inside the housing.

[0003] The housing is composed of a base having a bottom wall and a top cover connected to the base, and a circuit board is screwed to the bottom wall of the base. The top cover has an upper wall facing the circuit board and the bottom wall, and a keyboard is mounted in a keyboard mounting hole formed in the upper wall.

It is known that sources of electromagnetic noise in this type of portable computer are mainly high-frequency clock circuits and signal circuits. Therefore, as the performance of the MPU improves, the EMI: electromag
There is a tendency that demands for measures against netic interference tend to increase, and measures against EMI are important issues in improving the performance and ensuring reliability of portable computers.

It is known that the most effective countermeasure against EMI is to surround a circuit board, which is a source of noise, with a metal plate such as iron or aluminum. Usually, in electronic devices such as portable computers, since the housing is made of synthetic resin, the inner surface of the housing is subjected to electroless plating, and the inner surface of the housing is covered with a conductive plating layer. Is connected to a ground terminal of a circuit board.

In a portable computer in which the circuit board faces the keyboard mounting hole, the upper surface of the circuit board is covered with a metal shield plate, and this shield plate is connected to the ground terminal of the circuit board to form a housing. More and more electromagnetic shielding is being used.

[0007]

According to the conventional portable computer, the shield plate is electrically connected to the housing via a ground terminal on the circuit board.

However, since the housing is vertically divided into a base and a top cover, and the circuit board is screwed to the lower base, the shield plate and the top cover are not directly connected. For this reason, the electrical conduction between the shield plate and the top cover becomes insufficient, and the electromagnetic shield effect of the shield plate cannot be sufficiently exhibited even though the circuit board is covered with the shield plate. .

A first object of the present invention is to provide an electronic device capable of enhancing electric conduction between a housing and a shield plate and enhancing an electromagnetic noise shielding effect.

A second object of the present invention, in addition to the first object, is to use a shield plate to positively dissipate heat of circuit components to a keyboard, thereby improving heat radiation of the circuit components. The purpose of the present invention is to provide an electronic device capable of performing the following.

[0011]

According to a first aspect of the present invention, there is provided an electronic apparatus having a base and a top cover connected to the base. A conductive housing having a keyboard mounting hole formed therein; a keyboard installed in the keyboard mounting hole of the housing; a plurality of ground terminals formed on the front surface and the rear surface housed in the housing. A plurality of screws arranged to penetrate the terminal portion of the circuit board and couple the base and the top cover; and a metal interposed between the keyboard and the circuit board. And a shield plate. The base and the top cover each have a plurality of seats protruding toward terminal portions of the circuit board, and the screws are inserted between these seats, thereby forming the terminals of the circuit board. Portion is sandwiched between the seat portions, and the shield plate has a plurality of conductive pieces interposed between a terminal portion of the circuit board and a seat portion of the top cover. It is characterized by being attached to the cover.

According to such a configuration, the conductive piece of the shield plate is sandwiched between the seat and the circuit board when the seat of the top cover and the seat of the base are connected via the screw. For this reason, the conductive piece is firmly pressed against the ground terminal portion, and at the same time comes into direct contact with the seat portion of the top cover. it can.

[0013] In order to achieve the first object, a fourth aspect is provided.
The electronic device according to the present invention is made of a synthetic resin material containing carbon fiber, and has a conductive cover having a top cover with a keyboard mounting hole opened; and is disposed in the keyboard mounting hole of the housing. And a shielded metal plate. And the top cover is
Along with the plurality of protrusions around the keyboard mounting hole, the shield plate has a through portion through which the protrusions can penetrate, and the shield plate has a tip of the protrusion passed through the through portion. It is characterized in that it is integrated with the top cover by crimping and crushing.

According to such a structure, the carbon fibers having excellent electric conductivity contained in the resin are exposed by crushing the tips of the projections, so that the carbon fibers reliably contact the through portions of the shield plate. I do. For this reason, the electrical conduction between the shield plate and the top cover can be enhanced, and the electromagnetic shielding effect of the housing can be increased accordingly.

Further, when the shield plate is fixed to the top cover, a dedicated screw can be eliminated, which is advantageous in reducing the number of parts and reducing the weight of the housing.

In order to achieve the second object, the present invention provides a method according to claim 5.
An electronic apparatus according to the present invention includes: a base; a top cover connected to the base; a conductive housing having a keyboard mounting hole opened in the top cover; and a keyboard mounting hole of the housing. A keyboard mounted on the housing; a circuit board housed in the housing, having a plurality of ground terminals on the front and back surfaces, and having mounted thereon circuit components that generate heat during operation; A heat sink thermally connected to the circuit component and positioned below the keyboard; and a plurality of screws disposed through terminal portions of the circuit board for coupling the base and the top cover. And a metal shield plate interposed between the keyboard and the circuit board. And the base and the top cover are
Each has a plurality of seats protruding toward the terminals of the circuit board, and by inserting the screw between these seats, the terminals of the circuit board are sandwiched between the seats. The shield plate includes a plurality of conductive pieces interposed between a terminal portion of the circuit board and a seat portion of the top cover; a first contact piece that contacts the keyboard; A second contact piece that contacts the heat sink, and is attached to the top cover.

According to such a configuration, the conductive piece of the shield plate is sandwiched between the seat and the circuit board when the seat of the top cover and the seat of the base are connected via the screw. For this reason, the conductive piece is firmly pressed against the ground terminal portion, and at the same time comes into direct contact with the seat portion of the top cover. it can.

Further, since the shield plate is thermally connected to the heat sink via the second contact piece, the heat of the circuit component released to the heat sink is transferred from the second contact piece to the shield plate. . At this time, since the shield plate is in contact with the keyboard via the first contact piece, the heat of the circuit component transmitted to the shield plate is released to the keyboard via the first contact piece. For this reason, the heat of the circuit component is released to the outside of the housing by natural air cooling due to diffusion to the keyboard, and the heat dissipation of the circuit component can be enhanced by using the shield plate.

Further, since the shield plate constitutes a heat radiation path for promoting heat radiation of the heat sink, there is no need to arrange a heat radiation plate dedicated to dissipating heat of the heat sink to the keyboard inside the housing, and the number of parts is reduced accordingly. Can be reduced. In addition, the heat sink and the shield plate do not overlap vertically inside the housing, and the housing can be formed thin and compact.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings applied to a portable computer.

FIG. 1 discloses a portable computer 1 as an electronic device. Portable computer 1
Includes a computer main body 2 and a display unit 3 supported by the computer main body 2.

The computer main body 2 has a box-shaped housing 4. The housing 4 has a bottom wall 5, an upper wall 6 facing the bottom wall 5, a front wall 7 connecting the bottom wall 5 and the upper wall 6, left and right side walls 8, and a rear wall (not shown). ing. The thickness of the housing 4 is set to about 20 mm, and the thickness of the housing 4 is enhanced compared to a conventional general portable computer.

The housing 4 includes a base 10 having a bottom wall 5;
And a top cover 11 having an upper wall 6. The base 10 is made of a metal material having thermal conductivity such as a magnesium alloy. The top cover 11 is made of a synthetic resin material containing carbon fibers having excellent electric conductivity, and covers the base 10 from above.
The base 10 and the top cover 11 are connected to each other at four corners thereof via screws (not shown).

The upper wall 6 of the top cover 11 has a palm rest 12 and a keyboard mounting hole 13. The palm rest 12 extends in the width direction of the housing 4 in the front half of the upper wall 6. The keyboard mounting hole 13 is located behind the palm rest 12 and
Has a rectangular opening shape that opens toward the inside of the.

As shown in FIGS. 2 and 3, the keyboard mounting hole 13 has first and second opening edges 14a and 14b extending in the width direction of the housing 4, and a first and second opening edges 14a and 14b extending in the depth direction of the housing 4. And third and fourth opening edges 14c, 14d. First and second opening edges 14a, 14b
Are arranged parallel to each other at a distance in the depth direction of the housing 4 and have the third and fourth opening edges 14c,
14d are arranged in parallel with each other at a distance in the width direction of the housing 4.

The first to fourth opening edges 14a
14d each have four support walls 15 extending downward from the upper wall 6, and a lower end portion of the support wall 15 is formed with a flange portion 16 projecting into the keyboard mounting hole 13.

A keyboard 18 is provided in the keyboard mounting hole 13. The keyboard 18 includes a keyboard base 19 made of a synthetic resin, a number of keys 20, and a reinforcing plate 21 for reinforcing the keyboard base 19. The keyboard base 19 has the keyboard mounting hole 1
The keyboard 20 has a size such that it fits exactly into the keyboard base 3, and keys 20 are arranged on the upper surface of the keyboard base 19. The reinforcing plate 21 is made of a metal material having thermal conductivity such as an aluminum alloy. This reinforcing plate 21
Is attached to the lower surface of the keyboard base 19 and covers the entire lower surface.

The keyboard 18 has a keyboard base 19.
The front edge and the rear edge of the reinforcing plate 21 are connected to the first and second opening edges 14a, 14a of the keyboard mounting hole 13.
While being hooked on 14b, the outer peripheral edge of the reinforcing plate 21 is placed on the flange portion 16 to be held on the top cover 11. The reinforcing plate 21 of the keyboard 18
Are exposed to the inside of the housing 4 through the keyboard mounting hole 13.

The display unit 3 includes a flat display housing 23 and a liquid crystal display module 24 housed in the display housing 23. The display housing 23 is
It has a front surface on which the display opening 25 is formed. The liquid crystal display module 24 has a display screen 26 on which characters and images are displayed. The display screen 26 is exposed to the outside of the display housing 23 through the display opening 25.

The display housing 23 is rotatably supported at the rear end of the housing 4 via a pair of left and right hinge devices (not shown). Therefore, the display unit 3 can rotate between a closed position where the palm rest 12 and the keyboard 18 are covered and an open position where the palm rest 12, the keyboard 18 and the display screen 26 are exposed.

As shown in FIGS. 2 to 4, a circuit board 28 is housed inside the housing 4. Circuit board 28
Is arranged below the keyboard 18 in parallel with the bottom wall 5 of the housing 4. The circuit board 28 has a back surface 28a facing the bottom wall 5 and a front surface 28b facing the reinforcing plate 21 of the keyboard 18. A large number of circuit components 29 such as semiconductor packages and connectors are mounted on the back surface 28a and the front surface 28b. ing.

The circuit board 28 has a multilayer structure in which an insulating layer, a signal wiring layer, and a ground layer are stacked. A plurality of ground terminal portions 30a and 30b as shown in FIG.
30b are formed. The terminal portions 30a and 30b have a rectangular shape having a predetermined area. These terminal portions 30a and 30b face each other in the thickness direction of the circuit board 28, and are electrically connected to the ground layer via through holes (not shown) penetrating the circuit board 28. The circuit board 28 has a plurality of screw insertion holes 31 at positions corresponding to the terminal portions 30a and 30b, and these screw insertion holes 31 penetrate the circuit board 28 in the thickness direction.

As shown in FIG. 4, the bottom wall 5 of the housing 4 has a plurality of first seats 33 for supporting the circuit board 28, and the base 10 and the top cover 1 for supporting the circuit board 28 at the same time.
And a plurality of second seats 34 for connecting the first seat 1 and the second seat 34. These first and second seat portions 33 and 34 are respectively located at positions corresponding to the terminal portions 30a of the circuit board 28.
It protrudes upward from the bottom wall 5.

The first seat 33 has a screw hole 35. The screw hole 35 is opened at the upper end surface of the first seat portion 33 and is connected to the screw insertion hole 31 of the circuit board 28. A first screw 36 is inserted from above the circuit board 28 into the screw insertion hole 31 corresponding to the first seat portion 33. The insertion end of the first screw 36 is screwed into the screw hole 35, and the screwing fixes the circuit board 28 to the bottom wall 4 of the housing 4.

When the circuit board 28 is fixed to the bottom wall 4, the terminal portion 30a on the back surface 28a of the circuit board 28 contacts the upper end surface of the first seat portion 33, and the ground layer of the circuit board 28 and the housing 4 is electrically connected to the base 10.

As shown in an enlarged manner in FIG. 8, the second seat portion 34 has a hollow cylindrical shape that opens to the outer surface of the bottom wall 4. The upper end surface of the second seat portion 34 is
And the terminal portion 30a on the back surface 28a of the hologram. Second
A through hole 37 is formed in the upper end surface of the seat portion 34, and the through hole 37 is formed in the screw insertion hole 31 of the circuit board 28.
It is connected to.

The upper wall 6 of the top cover 11 has a plurality of third
(Only one is shown in FIG. 4). The third seat 40 is arranged around the keyboard mounting hole 13. These third seats 40 project downward from the upper wall 6 at positions corresponding to the second seats 34, and the lower ends of the third seats 40 face the surface 28 b of the circuit board 28.
Of the terminal 30b. A nut 41 is molded at the lower end of the third seat 40. The screw hole 41a of the nut 41 is connected to the screw insertion hole 31 of the circuit board 28.
Through the communication hole 37 of the second seat 34.

A second screw 42 is inserted into the second seat 37 from below the base 10. The insertion end of the second screw 42 is screwed into the screw hole 41a through the communication hole 37 and the screw insertion hole 31. With this screwing,
The second seat portion 34, the circuit board 28 and the third seat portion 40 are tightened together, and the second and third seat portions 3
The circuit board 28 is sandwiched between 4,40.

As shown in FIG. 4, a flange 16 connected to the second opening edge 14b of the keyboard mounting hole 13 is provided.
Has a pair of fourth seats 44 (only one is shown) projecting downward. The fourth seat portion 44 is provided on the circuit board 2.
8 faces the terminal portion 30b on the surface 28b. A nut 45 is molded on the fourth seat portion 44, and a screw hole 45 a of the nut 45 is connected to the screw insertion hole 31 of the circuit board 28.

A third screw 46 is inserted into the fourth seat 44 from below the circuit board 28. Third screw 46
Is inserted through the screw insertion hole 31 and screwed into the screw hole 45a.
Are fixed to the top cover 11.

In this case, the third screw 46 is connected to the circuit board 2
8 are located on both sides of the extension connector 47 mounted on the back surface 28a. The extension connector 47 faces a connector outlet 48 opened in the bottom wall 5. And
The third screw 46 fastens a connector cover (not shown) for opening and closing the connector outlet 48 to the expansion connector 47 together.

As shown in FIG. 9, the back surface 2 of the circuit board 28
8a includes an MPU 5 as a circuit component that generates heat during operation.
0 is implemented. Since the MPU 50 processes a variety of multimedia information such as characters, voices, and images, the power consumption during operation is large, and accordingly, the heat generation is large enough to require cooling. . The MPU 50 is disposed on the right side of the rear end of the circuit board 28,
It is located below the keyboard 18.

A heat sink 51 for facilitating heat radiation of the MPU 50 is accommodated in the housing 4. The heat sink 51 is mounted on the bottom wall 5 of the base 10.
The heat sink 51 integrally includes a heat receiving section 52 interposed between the circuit board 28 and the bottom wall 5 and a fan case 53 connected to the heat receiving section 52. The heat receiving section 52
It is thermally connected to the MPU 50. Fan case 53
Is housed between the circuit board 28 and the right side wall 8 of the housing 4, and a horizontal flat electric fan 54 is housed inside the fan case 53.

The fan case 53 has a flat ceiling wall 55 that covers the electric fan 54 from above. Ceiling wall 55
Is exposed to the keyboard mounting hole 13 and faces the reinforcing plate 21 of the keyboard 18.

An exhaust port 56 (shown in FIGS. 1 and 2) is formed in the side wall 8 of the housing 4 adjacent to the electric fan 54.

As shown in FIGS. 3 to 5, the circuit board 2
A shield plate 60 is interposed between the keyboard 8 and the keyboard 18. The shield plate 60 is made of a stainless material having a thickness of about 0.2 mm. Shield plate 60
Are first to fourth edges 61a along the first to fourth opening edges 14a to 14d of the keyboard mounting hole 13.
To 61d.

The first edge 61a of the shield plate 60 is adjacent to the flange 16 connected to the first opening edge 14a. A pair of tongue pieces 62 are attached to the first edge 61a.
a and 62b are integrally formed. Tongue pieces 62a, 62
b are spaced apart from each other in the width direction of the housing 4.

As shown in FIG. 6, the tongue pieces 62a, 62b
Is mounted on the upper surface of the flange portion 16. The tips of the tongue pieces 62a and 62b are connected to the flange 16 and the support wall 1 respectively.
5, and is inserted into a slit 63 formed in the corner.

The second edge 61b of the shield plate 60 is adjacent to the flange 16 connected to the second opening edge 14b. Supporting pieces 65a, 65b, 65c are formed at two places of the first edge 61a and one place of the second edge 61b of the shield plate 60, respectively.

The support pieces 65a, 65b of the first edge 61a
Are guided below the rear end of the palm rest 12 through below the flange portion 16 at positions separated from each other in the width direction of the housing 4. Supporting piece 65c of second edge 61b
Are guided below the flange portion 16 of the second edge portion 61b. At the ends of the support pieces 63a to 63c, through holes 66 (shown in an enlarged scale in FIG. 7) forming respective penetrating portions are opened.

On the lower surface of the rear end of the palm rest 12 and the lower surface of the flange portion 16 corresponding to the second opening edge 14b, a pair of convex portions 67 protruding downward are integrally formed. The protrusion 67 has a shaft shape and penetrates through the through holes 66 of the support pieces 65a, 65b, 65c.

As shown in FIG. 7, the tips of the protrusions 67 are crushed by passing through the through holes 66 and then heating and caulking. 65
a, 65b, and 65c are formed with a locking portion 68 to be hooked. Therefore, the shield plate 60 is
a, 62b and the supporting pieces 65a, 65b, 65c are undetachably supported by the top cover 11 and are integrated with the top cover 11.

In this case, the projection 67 is attached to the top cover 11.
When the convex portions 67 are caulked and crushed, the carbon fibers contained in the resin are exposed, and the carbon fibers contact the support pieces 65a, 65b, 65c. Therefore, the shield plate 60 and the top cover 11
Electrical conduction with the device is ensured.

As shown in FIGS. 3 and 4, a first edge 61a of the shield plate 60 is provided with a pair of first conductive pieces 70.
Are integrally formed. The first conductive piece 70 is formed on the surface 28b of the circuit board 28 at a position corresponding to the ground terminal 30b. As best shown in FIG. 8, the first conductive piece 70 has a tip portion 70 interposed between the terminal portion 30 b and the third seat portion 40 of the top cover 11.
a. An insertion hole 71 is formed in the distal end portion 70a. The insertion hole 71 is continuous with the screw insertion hole 31 of the circuit board 28 and the screw hole 41a of the third seat 40, and the second screw 42 penetrates the insertion hole 71.

Therefore, when the second screw 42 is tightened, the distal end 70 a of the first conductive piece 70 is moved to the third seat 40.
And the terminal portion 30b of the circuit board 28, and the first conductive piece 70 directly contacts the terminal portion 30b and the third seat portion 40, so that the top cover 11, the shield plate 60 and the circuit board The 28 ground layers are electrically connected.

As shown in FIGS. 2 and 3, the shield plate 60 has a plurality of escape holes 73 for avoiding interference with the circuit components 29 on the circuit board 28. This escape hole 7
3 and the second edge 60b of the shield plate 60
, Second conductive pieces 74 are integrally formed.
The second conductive pieces 74 are overlapped on the terminal portions 30 b on the surface 28 b of the circuit board 28, and these second conductive pieces 74
Is fixed to the circuit board 28 using the first screw 36.

As shown in FIG. 4, the support piece 65c of the second edge portion 61b is connected to the fourth seat portion 44 and the circuit board 2a.
8 between the fourth seat 44 and the terminal 30b via the third screw 46.
It is sandwiched between.

Therefore, the shield plate 60 is supported by the top cover 11 in a posture straddling between the first opening edge 14a and the second opening edge 14b of the keyboard mounting hole 13.

First to fourth edge portions 6 of shield plate 60
In each of 1a to 61d, a plurality of first contact pieces 75 are integrally formed. The first contact piece 75 extends from the first to fourth edges 61a to 61d toward the support wall 15. Then, the first contact piece 75 is in contact with the reinforcing plate 21 of the keyboard 18, whereby the shield plate 60 and the reinforcing plate 21 are electrically connected.

As shown in FIGS. 5 and 9, the remaining contact pieces 75 of the first contact pieces 75 except for the specific first contact piece 75 of the second edge 61b are bent obliquely upward. This imparts springiness. Therefore, when the keyboard 18 is attached to the keyboard attachment hole 13, the bent first contact piece 75 is attached to the reinforcing plate 2 of the keyboard 18.
1, so that the first contact pieces 75 and the reinforcing plate 21 reliably contact each other.

As shown in FIGS. 2 and 3, the fourth edge 61 d of the shield plate 60 is located directly above the ceiling wall 55 of the fan case 53. This fourth edge 6
The second contact piece 76 is formed integrally with 1d.
The second contact pieces 76 are arranged alternately with the first contact pieces 75 on the fourth edge 61d.
The contact piece 76 has a spring property by being bent obliquely downward. For this reason, the second contact piece 76 elastically contacts the ceiling wall 55 of the fan case 53.

An insulating sheet (not shown) is interposed between the shield plate 60 and the surface 28b of the circuit board 28.

According to the portable computer 1 having such a configuration, the shield plate 60 that covers the surface 28b of the circuit board 28 is fixed to the top cover 11, and the third seat portion of the top cover 11 is attached to the shield plate 60. 40 and a first portion 30b interposed between the terminal portions 30b on the circuit board 28.
Of the top cover 11 is formed.
When the second seat portion 34 of the base 10 and the second seat portion 34 of the base 10 are connected via the second screw 42, the first conductive piece 70 can be sandwiched between these seat portions 34 and 40.

For this reason, the first conductive piece 70 is
0b and the top cover 1
Since it is in direct contact with the first third seat portion 40, the electrical conduction between the top cover 11 and the shield plate 60 can be strengthened, and the electromagnetic shielding effect of the housing 4 can be enhanced as compared with the related art. it can.

Also, the shield plate 60 is
After the projections 67 of the top cover 11 are passed through the through holes 66 of a, 65b and 65c, the tips of the projections 67 are crushed to be supported by the top cover 11. At this time, the protrusion 67
Is made of a synthetic resin containing carbon fibers having excellent electrical conductivity, so that the carbon fibers contained in the resin are exposed when the convex portions 67 are crushed, and the carbon fibers become the support pieces 65a. , 65b, 65c.

Therefore, electrical conduction between the shield plate 60 and the top cover 11 is ensured, which is advantageous in enhancing the electromagnetic shielding effect of the housing 4.

At the same time, since screws and nuts for fixing the shield plate 60 to the top cover 11 become unnecessary,
The number of parts can be reduced, and the housing 4 can be reduced in size and weight and cost can be reduced.

Further, the shield plate 60 is provided with first and second opening edges 14a, 14a of the keyboard mounting hole 13.
b, the shield plate 60 is fixed to the top cover 11 so as to cover the keyboard mounting hole 1.
3 serves as the bottom. For this reason, the shield plate 60
Can be used to reinforce the opening of the keyboard mounting hole 13, and the strength of the synthetic resin top cover 11 can be increased.

In addition, according to the computer 1 having the above configuration, the shield plate 60 is in contact with the ceiling wall 55 of the heat sink 51 via the second contact piece 76 and the first plate.
Is in contact with the reinforcing plate 21 of the keyboard 18 via the contact piece 75 of the keyboard 18.

Therefore, the heat generated by the MPU 50 during use of the portable computer 1 is transmitted from the heat receiving portion 52 of the heat sink 51 to the fan case 53 and the second contact piece 76 from the ceiling wall 55 of the fan case 53.
Through the shield plate 60. Then, after the heat is diffused to the entire shield plate 60, the heat is transmitted to the reinforcing plate 21 of the keyboard 18 via the first contact piece 75 of the shield plate 60, and the natural air cooling due to the diffusion to the reinforcing plate 21 is performed. Is released to the outside of the housing 4.

Therefore, the heat radiation of the MPU 50 in the housing 4 can be enhanced by using the shield plate 60, and the MPU 50 operates at full specifications under a normal use temperature environment in combination with the forced air cooling by the electric fan 54. Can be done.

In addition, since the shield plate 60 forms a heat radiation path for transmitting the heat of the MPU 50 to the reinforcing plate 21 of the keyboard 18, a dedicated heat radiation for thermally connecting the heat sink 51 and the keyboard 18 inside the housing 4. There is no need to dispose a plate, and this also contributes to a reduction in the number of components and a reduction in the weight of the housing 4.

Further, the heat sink and the shield plate 60 do not overlap with each other inside the housing 4, so that the housing 4 can be easily made thin.

In the above embodiment, the top cover is made of a synthetic resin material containing carbon fibers. However, the material of the top cover is not limited to the above embodiment. As a resin such as (acrylonitrile / butadiene / styrene) or PC (polycarbonate), the inner surface thereof may be subjected to electroless plating.

[0075]

According to the first, fourth and seventh aspects of the present invention, the contact piece of the shield plate directly contacts the seat of the top cover. Electric conduction can be strengthened, and the electromagnetic shielding effect of the housing can be enhanced as compared with the related art.

According to the seventh aspect, the shield plate constitutes a heat radiation path for transmitting heat of the circuit components inside the housing to the keyboard, so that the heat of the circuit components is diffused to the keyboard by natural air cooling to cool the housing. Can be released outwards,
The heat dissipation of the circuit component can be enhanced by using the shield plate.

Further, since there is no need to arrange a dedicated heat radiating plate for thermally connecting the heat sink and the keyboard inside the housing, the number of parts can be reduced correspondingly, and the weight and cost of the housing can be reduced. Becomes possible. At the same time, there is an advantage that the heat sink and the shield plate do not overlap with each other in the inside of the housing, and that the housing can be easily made thin.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view of a portable computer according to an embodiment of the present invention;

FIG. 2 is an exemplary perspective view of the portable computer showing a positional relationship between a shield plate, a keyboard, and a heat sink;

FIG. 3 is a plan view of a computer main body.

FIG. 4 is an exemplary sectional view of the computer main body corresponding to a line 4F-4F in FIG. 3;

FIG. 5 is a sectional view of the computer main body showing a positional relationship between a shield plate fixed to a top cover and a keyboard.

FIG. 6 is an exemplary cross-sectional view of a portion of the computer main body corresponding to line 6F-6F in FIG. 3;

FIG. 7 is an enlarged sectional view showing a fixed portion of the shield plate to the top cover.

FIG. 8 is an enlarged sectional view showing an 8F portion of FIG. 4;

FIG. 9 is an exemplary cross-sectional view of a computer body corresponding to a line 9F-9F in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Housing 10 ... Base 11 ... Top cover 13 ... Keyboard mounting hole 18 ... Keyboard 28 ... Circuit board 28a ... Back surface 28b ... Front surface 30a, 30b ... Terminal part 34, 40 ... Seat part (2nd seat part, 3rd 42) Screw (second screw) 50 ... Circuit component (MPU) 51 ... Heat sink 60 ... Shield plate 66 ... Penetration part (through hole) 70 ... Conductive piece (first conductive piece) 75 ... First Contact piece 76 ... second contact piece

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yasuyuki Suzuki, Inventor 3-3-1, Shinmachi, Ome-shi, Tokyo Toshiba Computer Engineering Co., Ltd. (72) Inventor Masataka 3-chome, Shinmachi, Ome-shi, Tokyo No. 1 Toshiba Computer Engineering Co., Ltd. F term (reference) 5E321 AA02 AA11 AA14 AA17 BB34 CC22 GG01 GG05 GH03

Claims (7)

[Claims] 1. A conductive housing having a base and a top cover connected to the base, and a keyboard mounting hole opened in the top cover; and a conductive housing installed in the keyboard mounting hole of the housing. A keyboard; a circuit board housed inside the housing and having a plurality of ground terminals formed on the front and back surfaces; and a base and a top cover which are arranged to penetrate the terminals of the circuit board. A plurality of screws for coupling; a metal shield plate interposed between the keyboard and the circuit board; wherein the base and the top cover respectively project toward terminal portions of the circuit board. By inserting the screw between the seats, the terminal of the circuit board is sandwiched between the seats, and the shield plate is Electronic apparatus, characterized in that which has a plurality of conductive pieces which are interposed between the terminal portion and the seat portion of the top cover of the circuit board is attached to the top cover. 2. The electronic device according to claim 1, wherein the top cover is made of a synthetic resin material containing carbon fibers. 3. The top cover according to claim 2, wherein the top cover has a plurality of protrusions protruding toward the base around the keyboard mounting hole, and the shield plate allows the protrusions to penetrate. The shield plate is integrated with the top cover by caulking and crushing the tip of the convex portion passed through the through hole. machine. 4. A conductive case which is made of a synthetic resin material containing carbon fiber and has a top cover having a keyboard mounting hole, and a metal case disposed in the keyboard mounting hole of the housing. The top cover has a plurality of protrusions around the keyboard mounting hole, and the shield plate has a through portion through which the protrusions can pass. Is
An electronic device characterized by being integrated with the top cover by caulking and crushing the tip of the convex portion passed through the penetrating portion. 5. A conductive case having a base and a top cover connected to the base, wherein a keyboard mounting hole is opened in the top cover; and a conductive case installed in the keyboard mounting hole of the case. A keyboard; a circuit board housed in the housing, having a plurality of ground terminals on the front and back surfaces, and having mounted thereon circuit components which generate heat during operation; and a keyboard housed in the housing, and A heat sink that is thermally connected and located below the keyboard; a plurality of screws disposed through terminal portions of the circuit board for coupling the base and the top cover; And a metal shield plate interposed between the base plate and the circuit board, wherein the base and the top cover each have a plurality of protrusions protruding toward terminal portions of the circuit board. The terminal portion of the circuit board is sandwiched between the seat portions by inserting the screw between the seat portions, and the shield plate is connected to the circuit board. A plurality of conductive pieces interposed between a terminal portion of the board and a seat portion of the top cover, a first contact piece that contacts the keyboard, and a second contact piece that contacts the heat sink; And an electronic device attached to the top cover. 6. The keyboard mounting hole according to claim 1, wherein the keyboard mounting hole has first and second opening edges facing each other, and the shield plate has first and second openings of the keyboard mounting hole. An electronic device, wherein the electronic device is supported by the top cover in a posture straddling between opening edges. 7. The keyboard according to claim 5, wherein the keyboard has a metal reinforcing plate facing the shield plate, and the first contact piece of the shield plate is elastically pressed against the reinforcing plate. An electronic device characterized by being.