JPH08172293A - Electronic module-mounted circuit board unit - Google Patents

Abstract

PURPOSE: To provide an electronic module-mounted circuit board unit whose heat-dissipating property is good, which is small and which is electromagnetically shielded surely. CONSTITUTION: An electronic module-mounted circuit board unit is composed of an electronic module 100 in which a printed-wiring board 20 has been housed inside a case 30 composed of a metal material and of a circuit board 1 on which the electronic module 100 is mounted. The electronic module-mounted circuit board unit is provided with a surface conductor layer 91 and a rear- surface conductor layer 92 which are formed respectively on both the surface and the rear surface of the circuit board and whose shape is nearly equal to the bottom plate of the case, with a plurality of through holes 95 which have been made in the circuit board in such a way that the surface and rear-surface conductor layers 91, 92 are connected thermally and with a heat-conducting conductive sheetlike member which is interposed between the circuit board and the bottom plate of the case and which is mounted in such a way that its shape comes into close contact with the bottom plate of the case and that its rear surface comes into close contact with the surface conductor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic module mounting circuit board unit in which an electronic module is mounted on a circuit board.

In electronic devices such as communication devices in recent years, a printed wiring board is housed and sealed in a case to form an electronic module,
In many cases, the electronic module is mounted on a circuit board to form a circuit board unit, and a large number of such circuit board units are mounted in parallel on a shelf or the like.

[0003]

2. Description of the Related Art A conventional electronic module mounted circuit board unit will be described with reference to FIGS.

A conventional electronic module 10 is one in which a printed wiring board 20 is housed in a case 11 and electromagnetically shielded. Reference numeral 1 is a circuit board on which an electronic module is mounted.
The circuit board 1 is divided into an area for mounting the electronic module 10 and another circuit area, for example, a digital circuit forming area A, and the surface of the circuit board 1 for connecting the electronic module 10 and the digital circuit forming area A to each other. In addition, the circuit board mounting connector 2 is mounted.

The electronic module 10 is mounted on such a circuit board 1.
The electronic module mounted circuit board unit in which the connector is mounted has a connector mounted on the selected side edge of the circuit board 1. Then, by plugging this connector into a backboard connector arranged on a bag board provided on the bottom side of a shelf or the like, a plurality of electronic module mounted circuit board units are accommodated in parallel in a shelf (not shown). ing.

As shown in FIG. 10, the printed wiring board 20 has wiring patterns on the upper and lower surfaces divided into areas of the same shape by ground patterns 21, and parts are mounted in the respective divisions so that different functions (frequency conversion, (Amplification, etc.) is provided.

The case 11 is a shallow box-shaped lower case 11-2 made of a metal material for fixing the printed wiring board 20 to the opening side, and is fixed to the opening side of the lower case 11-2 by screwing to fix the printed wiring board. Shallow box-shaped upper case 11 made of metal that seals the plate 20
-1 and.

The lower case 11-2 is provided with a partition wall 11-2A having the same shape as the ground pattern 21 in correspondence with the ground pattern 21 formed on the lower surface of the printed wiring board 20, and the partition wall 11-2A is provided on the upper end surface side thereof. A large number of earth springs 25 are arranged close to each other.

As shown in detail in FIG. 11, the earth spring 25 is composed of a ceiling plate and a pair of side plate portions formed by bending both side edges of the ceiling plate so as to be sandwiched between the partition walls 11-2A. A U-shaped bent piece, which is in a cantilevered shape and is in pressure contact with the earth pattern 21, is provided on the ceiling plate.

When the ground spring 25 is sandwiched between the partition walls 11-2A, the conductive tube 26 is interposed between the ceiling plate of the ground spring 25 and the upper end surface of the partition wall 11-2A. Therefore, when the printed wiring board 20 is attached to the lower case 11-2 by using screws, the circuits provided in the respective areas partitioned by the ground pattern on the lower surface of the printed wiring board 20 are connected to the ground pattern 21 of the printed wiring board 20. Electromagnetically shielded by the electromagnetic shield composed of the ceiling plate of the earth spring 25, the conductive tube 26, the partition wall 11-2A, and the bottom plate of the lower case 11-2.

On the other hand, the upper case 11-1 is also provided with a partition wall,
The end face of the partition wall is pressed against a ground pattern 21 provided on the upper surface of the printed wiring board 20 via a ground spring and a conductive tube.

Therefore, when the upper case 11-1 is attached to the lower case 11-2 with screws, the circuits provided on the upper surface of the printed wiring board 20 in the respective regions partitioned by the ground pattern are printed wiring board 20. It is electromagnetically shielded by the electromagnetic shield composed of the ground pattern, the ground spring ceiling plate, the conductive tube, the partition wall 11-2A, and the bottom plate of the upper case 11-1.

A radiation fin is attached to the selected side surface of the case 11. Further, in order to fix the electronic module 10 to the circuit board 1, a plurality of fixing seats 16 are provided on the side surface of the lower case 11-2 so as to project, and screw holes for screwing the screws 9 are provided on the fixing seats 16. There is.

On the other hand, as shown in FIG. 9, in order to connect the electronic module 10 to the circuit board mounting connector 2,
A flat cable 13 is connected to the printed wiring board 20, the flat cable 13 is drawn out of the case 11, and a cable connector 15 for plugging into the circuit board mounting connector 2 is attached to the end of the flat cable 13.

In addition, the electronic module 10 connects the end of the signal input / output coaxial cable 12 to the printed wiring board 20 in order to connect to the external device, and the signal input / output coaxial cable 12 is connected.
Is pulled out of the case 11.

In this signal input / output coaxial cable, the jacket portion is press-fitted and fixed to the case using a fixing metal fitting. And
The ground conductor is connected to the peripheral ground pattern provided on the printed wiring board by soldering or the like, and the center conductor is connected to the signal pattern by soldering.

There are two methods for mounting the electronic module 10 on the circuit board 1, a method shown in FIG. 9 and a method for mounting the electronic module 10 on the upper surface of the circuit board 1.

In the method shown in FIG. 9, the circuit board 1 is provided with a hole 3 into which the electronic module 10 is horizontally inserted, the case 11 is inserted into the hole 3, and the lower surface of the fixing seat 16 is placed on the upper surface of the circuit board 1. The electronic module 10 is seated, the screw 9 is inserted into the screw hole of the circuit board 1 and screwed into the screw hole of the fixing seat 16 to fix the electronic module 10 to the circuit board 1.

Another method is to place the electronic module 10 on the upper surface of the circuit board 1, insert the screw 9 into the screw hole of the circuit board 1 and screw it into the screw hole of the fixing seat 16 to make the electronic module
10 is fixed to the circuit board 1.

In any mounting method, the cable connector 15 is plugged into the circuit board mounting connector 2,
The printed wiring board 20 and the circuit (for example, digital circuit type) of the circuit board 1 are connected.

[0021]

By the way, in the conventional electronic module mounted circuit board unit, the electronic module and the circuit board are connected via the flat cable drawn out of the case. The shield is incomplete.

Electromagnetic waves may leak from the signal input / output coaxial cable due to insufficient grounding between the ground conductor of the signal input / output coaxial cable and the case. on the other hand,
Since the electronic module is mounted on the circuit board by inserting the electronic module into the hole of the circuit board, not only the pattern cannot be formed in the hole portion of the circuit board, but the strength of the circuit board is weakened by providing the hole. Become.

Therefore, the circuit board is made sufficiently large to increase the strength and to expand the pattern formation region. That is, the former mounting method has a problem in that the electronic module mounting circuit board unit becomes large in size.

In the latter mounting method in which the electronic module is mounted on the upper surface of the circuit board, since the bottom surface of the case is in contact with the circuit board, heat dissipation from the bottom plate of the case is blocked, and the heat dissipation of the electronic module is prevented. However, there is a problem in that

Furthermore, the circuit forming sections of the printed wiring board surrounded by the earth pattern are electromagnetically shielded by the earth pattern, the earth spring arranged on the partition, the conductive tube, the partition, and the bottom plate of the case. However, it is very difficult to dispose the ground spring in the partition wall without any gap.

Therefore, there is a problem that a gap equal to the sum of the thickness of the ceiling plate and the thickness of the conductive tube is generated between the ground pattern and the end face of the partition wall, and the electromagnetic shield between the sections is lowered. .

The present invention was created in view of the above points, and an object thereof is to provide a small-sized electronic module mounted circuit board unit which has good heat dissipation. Another object of the present invention is to provide an electronic module mounted circuit board unit having a reliable electromagnetic shield.

[0028]

In order to achieve the above object, the present invention is an electronic module in which a printed wiring board 20 is housed in a case 30 made of a metallic material, as illustrated in FIG.
100, the circuit board 1 on which the electronic module 100 is mounted,
In the electronic module mounted circuit board unit consisting of, the upper and lower conductor layers 91, 92 having a shape substantially equal to the shape of the bottom plate of the case 30 and thermally connected through the plurality of through holes 95 are formed on the upper and lower sides of the circuit board 1. And the upper surface conductor layer 91 formed on the upper surface of the circuit board 1 on both surfaces of the case and the case.
A heat-conducting / conductive plate-shaped member 60 is interposed and closely adhered to the bottom plate of 30.

Furthermore, the printed wiring board mounting connector 6 is mounted on the lower surface of the printed wiring board 20 of the electronic module 100 so as to freely pass through the holes of the heat conductive / conductive plate member 60 and the connector holes 36 of the lower case 32. Then, the circuit board mounting connector 5 into which the printed wiring board mounting connector 6 is plugged in is mounted on the upper surface of the circuit board 1.

As illustrated in FIGS. 3 to 7, the printed wiring board 20 of the electronic module 100 has the ground pattern 21 and the peripheral ground pattern 22 for partitioning the wiring area for each function on the upper and lower surfaces, and the case. 30 is a shallow box-shaped upper case 31
And lower case 32, each of the upper and lower cases 3
1, 32 have partition walls 33, 34 corresponding to the ground pattern 21 and partitioning the inside of the case.

Further, there are grounding plates 50 and 52 with rims made of a heat conductive / conductive metal thin plate which are fitted and inserted into the respective compartments of the upper and lower cases 31 and 32. The edged earth plates 50, 52 have bent pieces 51, 53 arranged on the outer circumference of the edges so as to be in close contact with the upper end surfaces of the partition walls 33, 34.

Further, the heat-conducting / conductive sheets 55, 56 are attached to the bottom plates of the grounding plates 50, 52 with edges and the upper and lower cases 31, 32, respectively.
The heat conducting / conducting sheets 55 and 56 are interposed between the bottom plates of the above.

As illustrated in FIG. 8, the electronic module 10
In the signal input / output coaxial cable 40 derived from 0, the exposed ground conductor 42 part is peeled off from the jacket and fixed to the case 30 by press fitting to the case 30 by the fixing bracket 45, and the other part of the ground conductor 42 is printed. Soldered and bonded to the peripheral ground pattern 22 of the wiring board 20. Further, the center conductor 41 is soldered to the signal pattern 23 of the printed wiring board 20.

[0034]

According to the first aspect of the present invention, the electronic module is mounted and fixed on the upper surface of the circuit board via the heat conducting / conductive plate member without providing a large hole for inserting the electronic module in the circuit board. .

Therefore, the weakening of the strength of the circuit board is prevented, and the pattern can be formed in the inner layer of the circuit board below the electronic module. Therefore, miniaturization of the electronic module mounted circuit board unit is promoted.

Further, not only the heat of the electronic module is radiated to the outside from the top and side surfaces of the case, but also the bottom plate of the case-heat-conducting / conductive plate member-top conductor layer of the circuit board-through hole-circuit. Since it is also emitted from the lower surface of the circuit board through the lower surface conductor layer of the board, the heat dissipation of the electronic module is improved.

According to the second aspect of the present invention, the printed wiring board mounting connector of the electronic module is directly plugged into the circuit board mounting connector of the circuit board to connect the printed wiring board of the electronic module and the circuit board.

The outer peripheries of these connectors are surrounded by the inner wall of the hole provided in the bottom plate of the case and the inner wall of the hole provided in the heat conductive / conductive plate member. That is, since these connectors substantially function as coaxial connectors, the connection path between the electronic module and the circuit board is electromagnetically shielded.

According to a third aspect of the present invention, each of the upper and lower cases is partitioned by partition walls to provide compartments, and each compartment has a thin bent piece in close contact with the upper end surface of the partition wall. The heat conductive / conductive sheet is interposed between the bottom plate of the grounding plate with a rim and the bottom plates of the upper and lower cases.

Therefore, there is almost no gap between the ground pattern and the end face of the partition wall. Therefore, the electromagnetic shielding property between the compartments is improved. In addition, since the heat conductive / conductive sheet is closely intervened between the bottom plate of the edging ground plate and the bottom plate of the upper and lower cases, the heat of the printed wiring board and the components mounted on the printed wiring board passes through the partition walls. In addition to being transmitted to the case bottom plate, it is directly transmitted to the case bottom plate through the wide area bottom plate-wide area heat conductive / conductive sheet of the grounding plate with an edge.

Therefore, the heat dissipation is improved. Claim 4
In the invention, the ground conductor of the signal input / output coaxial cable is grounded to the peripheral ground pattern of the case and the printed wiring board.

Therefore, the grounding of the signal input / output coaxial cable is strengthened and the leakage of electromagnetic waves is prevented.

[0043]

The present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same objects throughout the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view showing a circuit board unit in a separated form, FIG. 3 is a view showing the essential parts of an electronic module, and FIG. 5 is a perspective view of the upper case side after the combination.

FIG. 6 is a perspective view showing the lower case side in a separated form, FIG. 7 is a view showing the assembly of the upper case and the lower case, and FIG. 8 is a view showing the mounting of the signal input / output coaxial cable. , (A) is a perspective view shown in a separated form, and (B) is a sectional view.

In FIGS. 1 and 2, 100 is an electronic module in which the printed wiring board 20 is housed in the case 30 and electromagnetically shielded. Reference numeral 1 is a circuit board on which the electronic module 100 is mounted and which is made of, for example, a glass fiber-containing epoxy resin laminated plate.

The circuit board 1 is divided into an area for mounting the electronic module 100 and another circuit area, for example, a digital circuit forming area A. Electronic module on circuit board 1
An electronic module mounting circuit board unit having 100 is equipped with a connector on a selected side edge of the circuit board 1. Then, by plugging this connector into a backboard connector arranged on a bag board provided on the bottom side of a shelf or the like, a plurality of electronic module mounted circuit board units are accommodated in parallel in the shelf.

An upper surface conductor layer 91 having a shape substantially equal to the bottom plate shape of the case 30 is provided on the upper surface of the circuit board 1, and a lower surface conductor layer 92 of the same shape is provided on the lower surface of the circuit board 1 so as to face the upper surface conductor layer 91.
Is provided.

The upper surface conductor layer 91 and the lower surface conductor layer 92 are thermally connected to each other through a number of through holes 95 arranged. A rectangular area without a conductor layer is provided in the formation area of the upper conductor layer 91 of the circuit board 1, and the circuit board mounting connector 5 is mounted on the rectangular area so that the connection port faces upward.

Reference numeral 60 is a heat-conducting / conductive plate-like member made of a flexible heat-conducting / conductive rubber plate or the like. The heat-conducting / conductive plate-shaped member 60 is a prism having the same shape as the upper conductor layer 91,
A hole through which the circuit board mounting connector 5 is loosely provided is provided at a position corresponding to the circuit board mounting connector 5.

Case 30 that constitutes the electronic module 100
The shallow box-shaped upper case 31 and the thin box-shaped lower case 32 are overlapped with their opening faces facing each other, and the peripheral edges are closely attached to each other.
It is made of a metal material such as aluminum that is integrally fixed with 39.

A plurality of horizontally fixed fixing seats 35 are provided in an array on the outside of the outer wall of the lower case 32, and the fixing seats 35 are bolted.
A screw hole for screwing 99 (a bolt for mounting on the circuit board 1) is provided.

A step 38 is provided inside the end surface of the outer wall of the upper case 31, the peripheral portion of the printed wiring board 20 is aligned and placed on the step 38, and the screw (screw 29 shown in FIG. 3) is used to print the wiring. The plate 20 is fixed to the upper case 31.

On the lower surface of the printed wiring board 20, there is mounted the printed wiring board mounting connector 6 which loosely penetrates the holes of the heat conductive / conductive plate member 60 and the connector holes 36 of the lower case 32.
The heat-conducting / conductive plate-shaped member 60 is aligned with and placed on the upper surface conductor layer 91 of the circuit board 1.

Then, the printed wiring board mounting connector 6 is plugged into the circuit board mounting connector 5, the bottom plate of the lower case 32 is mounted on the upper surface of the heat conducting / conductive plate member 60, and the electronic module 100 is mounted on the circuit board 1. Place it, insert the bolt 99 into the bolt hole of the circuit board 1 from the bottom side, and secure the seat of the case 30.
The electronic module 100 is mounted on the circuit board 1 by being screwed into the screw holes of 35.

Therefore, the lower surface of the heat conductive / conductive plate member 60 is in close contact with the upper conductor layer 91, and the upper surface thereof is in contact with the bottom plate of the lower case 32. The electronic module 100 will be described in detail below with reference to FIGS. 3 to 7.

The printed wiring board 20 is a circuit in which upper and lower wiring areas are divided into areas of the same shape by the ground pattern 21 and parts are mounted in the respective areas to provide different functions (frequency conversion, amplification, etc.). Is provided.

A frame-shaped peripheral earth pattern 22 is provided on the peripheral edges of the upper and lower surfaces of the printed wiring board 20. The end of the earth pattern 21 is connected to the peripheral earth pattern 22.

The upper case 31 is provided with a partition wall 33 for partitioning the interior of the case corresponding to the ground pattern 21, and the lower case 32 is also partition wall for partitioning the interior of the case corresponding to the ground pattern 21.
34 are provided.

The bottom plate of the lower case 32 is provided with a rectangular connector hole 36 through which the printed wiring board mounting connector 6 freely penetrates. Reference numeral 50 is an edged earth plate, which is inserted into each compartment of the upper case 31 and is made of, for example, a thin copper plate. An upper edge of the edge of each edge-attached ground plate 50 is bent outward at a right angle to provide a bent piece 51 that is in close contact with the upper end surface of the partition wall 33.

Reference numeral 55 is a rectangular plate shape that can be inserted into each compartment of the upper case 31, and is placed on the bottom plate of the upper case 31, for example, a thin elastic heat conductive member, a heat conductive member made of a conductive rubber sheet, or the like. It is a conductive sheet.

Reference numeral 52 shown in FIG. 6 is a grounding plate with an edge, which is inserted into each compartment of the lower case 32 and is made of, for example, a thin copper plate. The upper edge of the edge of each edged ground plate 52,
A bending piece 53 is provided which is bent at a right angle to the outside and is in close contact with the upper end surface of the partition wall 34.

Reference numeral 56 is a rectangular plate shape that can be inserted into each compartment of the lower case 32, and is placed on the bottom plate of the lower case 32, for example, a thin elastic heat conductive member, a heat conductive member made of a conductive rubber sheet, or the like. It is a conductive sheet.

As shown in FIGS. 3 and 4, the heat conductive / conductive sheet 55 is placed closely on the bottom plate of each section of the upper case 31, and the edge earth plate 50 is inserted to insert the edge earth. After the bent piece 51 of the plate 50 is brought into close contact with the upper end surface of the partition wall 33, the peripheral portion of the printed wiring board 20 is provided with the step 38 provided on the end surface of the outer wall of the upper case 31.
Align and place it on the printed wiring board using screws 29.
20 is fixed to the upper case 31.

On the other hand, the heat-conducting / conductive sheet 56 is placed closely on the bottom plate of each section, the grounding plate 52 with an edge is inserted, and the bent piece 53 of the grounding plate 52 with an edge is placed on the partition wall 34. The opening surface of the lower case 32 closely attached to the end surface is aligned and overlapped with the opening surface of the upper case 31 with the printed wiring board 20 attached, and the end surfaces of both outer walls are fitted together, and the upper surface of the upper wall is screwed with the screw 39 The case 31 and the lower case 32 are integrally fixed.

As described above, the printed wiring board 20 is electromagnetically shielded and housed in the case 30. On the other hand, in the electronic module 100, the central conductor 41 of the signal input / output coaxial cable 40 is connected to the printed wiring board 20 in order to connect to an external device.
It is connected to the signal pattern 23 and is drawn out of the case 30.

More specifically, as shown in FIG. 8, the jacket of the portion corresponding to the outer wall of the upper case 31 of the signal input / output coaxial cable 40 is peeled off, and the earth conductor 42 is exposed in a cylindrical shape.
Further, the outer cover of the portion corresponding to the peripheral portion of the printed wiring board 20 is peeled off to expose the other portion of the ground conductor 42 in a cylindrical shape.

Further, the outer cover of the terminal portion of the signal input / output coaxial cable 40, the ground conductor 42, and the dielectric provided on the outer periphery of the center conductor 41 are removed to leave the center conductor 41 bare. 45
Is a rectangular parallelepiped fixing metal fitting made of a conductive metal material and fixed to the upper end surface of the outer wall of the upper case 31 by using a screw 49.

A groove whose bottom is opened is provided in the center of the lower surface of the fixing member 45. The groove width is substantially equal to the diameter of the ground conductor 42, and the depth of the groove is smaller than the diameter of the ground conductor 42.

The fixing metal fitting 45 is provided with screw holes penetrating in the vertical direction on both sides of the groove. A screw 49 is inserted into the screw hole, and the screw portion is provided on the upper end surface of the outer wall of the upper case 31. The fixing member 45 is fixed to the upper case 31 by being screwed into the hole.

Reference numeral 44 denotes a saddle-shaped connecting fitting made of a thin copper-based metal plate in a front view, and has a slot-like slit into which solder is poured near the top. Also, the upper case
A channel-shaped groove is provided on the end surface of the outer wall of 31, and the conductive tube 46 is inserted sideways into the channel-shaped groove.

The center conductor 41 of the signal input / output coaxial cable 40 is soldered and adhered to the signal pattern 23 of the printed wiring board 20. The upper part of the ground conductor 42, which is exposed at a position away from the center conductor 41, is covered with a connecting fitting 44, and the left and right fins of the fixing fitting 45 are soldered to the peripheral ground pattern 22, so that the ground conductor 42 is surrounded by the peripheral ground pattern. It is glued to 22. Further, solder is poured into the long hole-shaped slit of the connection fitting 44 to bond the ground conductor 42 and the connection fitting 44.

A bare earth conductor 42 is positioned and placed on a conductive tube 46 at a position corresponding to the outer wall of the upper case 31. Then, the fixing metal fitting 45 is covered from above the signal input / output coaxial cable 40 so that the groove provided on the lower surface fits the ground conductor 42, and the fixing metal fitting 45 is fixed to the upper case 31 by using the screw 49, whereby the ground conductor is formed. 42 is pressed against the conductive tube 46 to electrically connect the ground conductor 42 and the upper case 31, and the signal input / output coaxial cable 40 is fixed to the upper case 31.

[0074]

Since the present invention is constructed as described above, the present invention has the following effects. Preventing weakening of the strength of the circuit board by mounting and fixing the electronic module on the top surface of the circuit board via the heat conductive / conductive plate-like member without providing a large hole for inserting the electronic module in the circuit board In addition, a pattern can be formed on the inner layer of the circuit board below the electronic module, and the miniaturization of the electronic module mounted circuit board unit is promoted.

Further, not only the heat of the electronic module is radiated to the outside from the top and side surfaces of the case, but also the bottom plate of the edging earth plate-heat conductive / conductive sheet-the bottom plate of the case-
Since it is also released from the lower surface of the circuit board through the heat conductive / conductive plate-shaped member-the upper conductor layer of the circuit board-the through hole-the lower conductor layer of the circuit board, the heat dissipation of the electronic module is good.

Since the printed wiring board mounting connector of the electronic module is directly plugged into the circuit board mounting connector of the circuit board and has a function substantially as a coaxial connector, the connection path between the electronic module and the circuit board is formed. But the electromagnetic shield is perfect.

Electromagnetic shielding between circuits having different functions formed on the printed wiring board is sufficiently performed, and generation of radio noise in the electronic module is suppressed. Since the ground conductor of the coaxial cable is surely grounded to the peripheral ground pattern of the case and the printed wiring board, leakage of electromagnetic waves from the signal input / output coaxial cable introduced into the electronic module is prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view showing a circuit board unit in a separated form.

FIG. 3 is a diagram showing a main part of an electronic module.

FIG. 4 is a perspective view showing the upper case side in a separated form.

FIG. 5 is a perspective view of the upper case side after combination.

FIG. 6 is a perspective view showing the lower case side in a separated form.

FIG. 7 is a view showing an assembly of an upper case and a lower case.

FIG. 8 is a diagram showing the mounting of the signal input / output coaxial cable,
(A) is a perspective view shown in a separated form, and (B) is a sectional view.

FIG. 9 is a perspective view of a conventional example.

FIG. 10 is a view showing a conventional electronic module in a separated form.

FIG. 11 is a perspective view showing a main part of a conventional example.

[Explanation of symbols]

1 Circuit board 2 Circuit board mounting connector 10,100 Electronic module 11,30 Case 11-1,31 Upper case 11-2,32 Lower case 11-2A, 33,34 Bulkhead 12,40 Signal input / output coaxial cable 13 Flat cable 20 Print Wiring board 21 Ground pattern 22 Peripheral ground pattern 23 Signal pattern 35 Fastening seat 38 Step 41 Center conductor 42 Ground conductor 44 Connection fitting 45 Fixing fitting 46 Conductive tube 50,52 Edged grounding board 51,53 Bent piece 55,56 Heat conduction・ Conductive sheet 60 Heat-conducting / conductive plate member 91 Upper surface conductor layer 92 Lower surface conductor layer 95 Through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Hagiwara 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Toshimitsu Kobayashi 1015 Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited ( 72) Inventor Yoshiaki Minowa, 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (4)

[Claims] 1. An electronic module mounting circuit board unit comprising an electronic module containing a printed wiring board in a case and a circuit board on which the electronic module is mounted. The electronic module mounting circuit board unit is formed on each of upper and lower surfaces of the circuit board. An upper surface / lower surface conductor layer having a shape substantially equal to the bottom plate of the case, a plurality of through holes arranged in the circuit board so that the upper surface / lower surface conductor layers are thermally connected, the circuit board and the An electronic module, which is provided between the bottom plate of the case and a heat-conducting / conductive plate-like member, the top surface of which is attached to the bottom plate of the case and the bottom surface of which is attached to the top conductor layer, respectively. On-board circuit board unit. 2. A printed wiring board mounting connector that freely penetrates through the holes of the heat conductive / conductive plate member and the connector holes provided in the bottom plate of the case is mounted on the lower surface of the printed wiring board of the electronic module. An electronic module mounted circuit board unit, wherein a circuit board mounted connector into which the printed wiring board mounted connector is plugged is mounted on an upper surface of the circuit board. 3. The printed wiring board of the electronic module according to claim 1, wherein a ground pattern and a peripheral ground pattern for partitioning a wiring region for each function are formed on both upper and lower surfaces, respectively. The module case comprises a shallow box-shaped upper case and a lower case, and each of the upper and lower cases has a partition wall provided so as to partition the inside of the case corresponding to the earth pattern, An edged earth plate made of a heat-conducting / conductive thin metal plate that is fitted and fitted into each compartment of the upper and lower cases, and an edge of the edged earth plate so as to be in close contact with the upper end surface of the partition wall. A bent piece arranged on the outer periphery of the sheet, and a heat conductive / conductive sheet mounted so as to be interposed between the bottom plate of each edge-attached earth plate and the bottom plate of the upper and lower cases. Equipped with electronic module Road board unit. 4. A signal input / output coaxial cable led out from the electronic module, wherein a bare ground conductor portion having an outer cover peeled off is pressed and fixed to a case by a fixing metal fitting, and the other portion of the ground conductor is 2. The printed wiring board according to claim 1, wherein the central conductor is soldered and bonded to a peripheral ground pattern of the printed wiring board, and the center conductor is soldered to a signal pattern of the printed wiring board.
The electronic module mounted circuit board unit according to 2 or 3.