JP2621960B2 - Mounting device for integrated circuit having metal substrate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to mounting of an integrated circuit having a metal substrate, where a conductive foil is adhered on a metal substrate via an insulating layer and circuit elements are fixed. Related to the device.

[Prior Art] Conventionally, as an integrated circuit in which a conductive element is fixed on a metal substrate via an insulating layer and a circuit element is fixed, Japanese Patent Publication No.
The technique disclosed in Japanese Patent Publication No. 234 is known. In the method of manufacturing an integrated circuit disclosed in this prior art, a step of anodizing at least one main surface of an aluminum substrate to form an aluminum oxide thin layer on the substrate surface, and a step of forming a resistor on the aluminum oxide thin layer Forming a plurality of circuit elements by selectively forming a substance and a good conductor substance,
The method includes a step of fixing a transistor pellet on a lead portion formed by selectively attaching a good conductor, and a step of sealing at least all of the circuit elements with an insulating resin.

In the integrated circuit formed in this manner, heat generated from the resistor, the transistor, and the like during operation is quickly and effectively dissipated, and the output circuit and the like can be integrated. .

The integrated circuit having the metal substrate formed as described above may be used, for example, for in-vehicle use from the viewpoint of its small size and low cost. Here, when such an integrated circuit is actually used for a vehicle, for example, a signal system used for an anti-theft system, a flashing system of a lamp, an operating system of a wiper, or the like is used as a joint box (connection box). In some cases, the present invention is applied to a system for connecting and controlling a joint system to this joint box (hereinafter, referred to as a total wiring system and abbreviated as TWS).

[Problems to be Solved by the Invention] In such TWS, in recent years, with the increase in the number of functions, the number of TWS units as control units connected to a joint box and the number of connection terminals in each TWS unit have been increased. The number is increasing. For this reason, although the integrated circuit itself can be reduced in size and weight, the increase in the size of the joint box is unavoidable due to the connection mechanism unless the size of the joint box is increased. In particular, it has been pointed out that with the increase in types of automobiles, the number of variations of the control contents increases, and if it is intended to cope with the increased variations, the problem that the terminal arrangement becomes complicated is pointed out.

The present invention has been made in view of the above problems,
An object of the present invention is to provide an apparatus for mounting an integrated circuit having a metal substrate, which can reduce the size of a connection box to which the integrated circuit is connected.

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the object, an integrated circuit mounting device having a metal substrate according to the present invention includes:
A plurality of integrated circuits having a metal substrate are simultaneously mounted, each having an independent control function, a conductive foil attached to a metal substrate via an insulating layer, and a circuit element fixed. A connection box that is electrically connected, and multiplex transmission means provided in the connection box and connecting the plurality of integrated circuits and the controlled unit by multiplex transmission.

Further, in the integrated circuit mounting device having a metal substrate according to the present invention, the metal substrate is formed by dividing one common substrate into a plurality, and each of the plurality of substrates is connected via a flexible circuit board. It is characterized by being.

[Operation] In the integrated circuit mounting device configured as described above, since a plurality of integrated circuits and the controlled unit are connected by multiplex transmission in the connection box, the number of connection points is reduced and In addition, the number of internal wirings can be reduced, and the connection box can be reliably reduced in size.

[Embodiment] Hereinafter, a configuration of an embodiment of an integrated circuit mounting apparatus having a metal substrate according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a joint box as a mounting device 10 of this embodiment. This joyoin box
In FIG. 10, a plurality of logic modules, in this embodiment, a first and a second integrated circuit 12 are divided into a plurality of logic modules in a state where the conventional TWS control unit is divided into single modules. , 14 are the first and second connector mechanisms 16, 18, respectively.
Are removably connected via a.

Here, although the configuration of each of the integrated circuits 12 and 14 will be described in detail later, the first control circuit 12 includes a control circuit 12a for executing the function of the anti-theft system, and an external circuit. A first multiplex communication interface circuit 12b for connecting the control unit and the detection unit by multiplex transmission; On the other hand, the second control circuit 14 is a control circuit 14a for executing the function of the lamp flushing system.
And a second multiplexed signal interface circuit 14b for connecting the control circuit 14a to an external controlled unit and a detection unit by multiplex transmission.

Here, the first connector mechanism 16 is connected to the first integrated circuit 12.
A first male connector 16a integrally formed with the first male connector 16a, and a first female connector 16a integrally mounted on the joint box 10 detachably to the first male connector 16a.
b. In addition, the second connector mechanism 18
Is a second male connector 18a integrally formed on the second integrated circuit 14, and a second male connector 18a integrally mounted on the joint box 10 in a detachable manner with the second male connector 18a. And the female connector 18b.

The first and second male connectors 16a, 18a are both formed in the same shape. As a result, the first and second female connectors 16b, 18b are also formed in the same shape. As a result, the first
The first male connector 16a integrally attached to the second integrated circuit 12 can be connected to the second female connector 18b, and can be integrally attached to the second integrated circuit 14. The second male connector 18a thus obtained can be connected to the first female connector 16b.

On the other hand, a multiplexing unit 24 is connected to the above-mentioned joint box 10 via a multiplexing harness 22 via a third connector mechanism 20. The third connector mechanism 20 includes a third male connector 20a to which one end of the multiplex harness 22 is connected, and a third male connector 20a detachably connected to the male connector 20a. And a third female connector 20b which is attached in a fixed manner.

Here, the first to third connector mechanisms 16, 18, 20
Are connected to transmit multiplexed signals, as will be described later. Each connection terminal is connected to a power supply, one bus line, the other bus line, a ground, It is formed to have poles.

The joint box 10 includes a lamp horn (not shown) as a controlled unit controlled by the first and second integrated circuits 12 and 14, various sensors as a detection unit, a battery as a power supply, and the like. Are connected via, for example, fourth to sixth connector mechanisms 26, 28, and 30, respectively. These fourth to sixth connector mechanisms 26, 28, 30 include male connectors 26a, 28a, 30a attached to one ends of harnesses 32, 34, 36 connected to the corresponding connected portions, respectively.
The female connectors 26 integrally formed on the joint box 10 are detachably attached to the male connectors 26a, 28a, 30a.
b, 28b, 30b.

Here, the fourth to sixth connector mechanisms 26, 28, 30
Are configured to connect non-multiplexed signals, and the number of connection terminals is individually determined according to the number of connected devices and the like.

Thus, inside the joint box 10 to which the various connector mechanisms are connected, multiplexed information is converted into non-multiplexed information, and non-multiplexed information is converted into multiplexed information. And a multiplexing interface circuit 38 for performing the operation. The multiplexed interface circuit 38 includes a multiplexed terminal group to which multiplexed information is input / output, and a non-multiplexed terminal group to which non-multiplexed information is input / output.

Here, the multiplexed terminal group is, as described above, for power supply,
It is composed of four poles for one bus line, the other bus line, and ground, and is connected to the corresponding terminals of the first to third female connectors 16b, 18b, 20b independently. . That is, the multiplexed interface circuit 38 and each of the first to third female connectors 16b, 18b, 20b
The connection is made via four connection lines. The non-multiplexed terminal group includes the fourth to sixth female connectors 26.
The terminals b, 28b, 30b are connected to the corresponding terminals via a plurality of connection lines.

As described above, the first and second integrated circuits 12 and 14 are connected to the joint box 10 of this embodiment configured as described above. Hereinafter, the configurations of the integrated circuits 12, 14 will be described in detail. Here, since these integrated circuits 12, 14 are formed in the same shape, only the first integrated circuit 12 will be described below, and the description of the configuration of the second integrated circuit 14 will be omitted.

As shown in FIG. 2, the first integrated circuit 12 is formed as a box-shaped case whose inside is closed, and a first male connector 16a as a connection device is integrally formed at one end. Attached to. Although the configuration of the male connector 16a will be described later in detail, the first female connector 16b
Here, a commonly used female connector is used. Here, as shown in FIGS. 3 to 4B, the integrated circuit 12 is a pair of circuit boards 40a and 40b vertically separated from each other. When,
The circuit boards 40a and 40b are spaced apart from each other by a predetermined distance, and a side plate 42 for closing a side surface is provided.
and a frame body 44 for integrally fixing the side plate 42 and the side plate 42.

Specifically, both circuit boards 40a and 40b include ICs necessary to exhibit the functions as the control circuit 12e and the multiplex communication interface circuit 12b of the anti-theft system as described above.
Circuit elements such as a chip, a resistor, and a capacitor are mounted. Here, both circuit boards 40a and 40b are set so as to be formed by dividing one common board 46 into two, as shown in FIG. 5A.

That is, as shown in FIG. 5B, the common substrate 46 includes a substrate body 46a formed of a conductive material, for example, a metal such as aluminum, and an insulating layer adhered over the front surface of the substrate body 46a. 46b, a conductive foil 46c formed in a predetermined circuit pattern on the insulating layer 46b and defining a circuit rope, and a circuit element 4 fixed on the conductive foil 46c and electrically connected thereto.
6d.

In the common substrate 46, as shown in FIG. 5A, an opening 46e extending in the up-down direction is formed in advance at the center of the drawing. Here, the circuit ropes on both left and right sides of the opening 46e are provided across the opening 46e and are connected to each other via a flexible circuit board 46f. Then, by cutting the upper and lower edges (regions indicated by symbols X and Y) including the upper and lower ends of the opening 46e,
It is set so that the pair of circuit boards 40a and 40b described above are formed.

The upper surface of the outer end of one of the circuit boards 40a (the left circuit board in the figure), that is, the inner surface of the end that defines one end of the case in a state in which the circuit board 40a is vertically spaced apart from each other, Four connection terminals 46g, 46h, 46i, 46j are formed in a horizontal line along the edge. In addition, these connection terminals 46g, 46h, 46i, 46j
The connection pins 48a, 48b, 48 of the male connector 16a described later
c and 48d are respectively fixed so as to protrude outward and are electrically connected to each other.

Further, the above-mentioned side plate 42 is formed in a U-shape with one side opened, and the opened side part is set to be one end of the case. The inner edges of the upper and lower end faces of the side plate 42 are provided with the corresponding circuit boards 40a and 40b.
Steps 42a and 42b for receiving the other edge are formed respectively.

Here, as shown in FIG. 4A, the circuit boards 40a and 40b are fitted into the corresponding steps 42a and 42b via the seal rubber 50. By providing the seal rubber 50, dust is prevented from entering the case from between them.

On the other hand, as shown in FIG.
It is formed so as to surround the side surface closed by 42 from above and below. That is, this frame 44 is
A predetermined distance from the upper and lower ends of the main body 44a opposed to the side plate 42 (specifically, a sufficient distance to clamp the three open edges of the upper and lower circuit boards 40a and 40b, respectively) ) Is integrally formed with the flange portions 44b and 44c extending inward.

As shown in FIG.4B, the frame body 44 includes upper and lower circuit boards 40a and 40b respectively fitted into upper and lower steps 42a and 42b of the side plate 42,
The case is formed so as to be integrally formed by being clamped from above and below. As shown, the flexible circuit board 46f for connecting the circuit elements 46d of the upper and lower circuit boards 40a, 40b to each other is set to be located inside the other end of the side plate 42.

Since the frame body 44 is formed in this way, the side plate 42
The circuit boards 40a and 40b are maintained in an assembled state while being vertically separated from each other by a predetermined distance in a state in which the components are interposed.

That is, in this embodiment, the first integrated circuit 12
Is formed in a case shape, and both upper and lower surfaces of the case are defined immediately after the circuit boards 40a and 40b. As a result, a reduction in size and weight can be achieved as compared with a case where both circuit boards 40a and 40b are housed in a separately prepared case.

Next, the case-shaped integrated circuit 12 thus configured
The structure of the first connector mechanism 16 for electrically connecting the above-mentioned structure to the joint box 10 will be described with reference to FIG.

The first connector mechanism 16 includes a case-shaped integrated circuit 12.
Is attached to the opening at one end in a so-called internal state.
And a second female connector 16b formed integrally with the joint box 10 so as to be detachably connected to the first male connector 16a.

The first male connector 16a includes a connector main body 52 formed of a box-shaped housing with one side open,
The connector main body 52 is set so as to be just fitted into one end opening of the case-shaped integrated circuit 12. In this state, the connector main body 52 is fixed to the integrated circuit 12 with screws or the like.

Here, the connector body 52 is a case-shaped integrated circuit.
12 has a standing piece 52a that just closes one end opening,
The upright piece 52a has four through holes 52b, 52c, 52d, and 52e arranged in the lateral direction. The connection pins 48a, 48b, 48c, 48d described above are penetrated through the through holes 52b, 52c, 52d, 52e, respectively.

On the other hand, the above-mentioned first female connector 16b is attached to the joint box 10 as a fixed portion to which the case-like first integrated circuit 12 is attached, as shown in FIG. In detail, this joint box 10
Has a first opening 10a on the upper side surface into which the first integrated circuit 12 is inserted, and a first opening formed continuously with the first opening 10a and accommodating the first integrated circuit 12 therein. Is formed so as to have the recess 10b.

Also, the joint box 10 has just the first opening 10.
A second opening 10c into which the second integrated circuit 14 is inserted is formed in a state immediately below a. A second recess 10d for accommodating the second integrated circuit 14 therein is provided so as to be continuous with the second opening 10c.

Here, the above-mentioned first female connector 16b is connected to the inner end face of the first recess 10b for accommodating the integrated circuit 12 through the inside of the first recess 10b. The first male connector 16a is integrally provided with the first male connector 16a. That is, the first integrated circuit 12 is attached to the back end face of the first recess 10b by being inserted through the first recess 10b inward through the first opening 10a. Is connected to the first female connector 16b, and both are electrically connected.

On the other hand, the above-described second female connector 18b is similarly integrated with the second integrated circuit 14 inserted into the second recess 10d on the rear end face of the second recess 10d. The second male connector 18a is provided so as to face the second male connector 18a.

Also, since the type conventionally used as a male connector is heavy and large, it is not necessary to adopt this type, and a dedicated second type is used in response to the small and lightweight case-shaped integrated circuit 12. One male connector 16a is formed. Therefore, according to this embodiment, the above-described integrated circuit
Based on the reduction in size and weight of 12, the joint box 10 can contribute to the reduction in size.

As described in detail above, in this embodiment, the integrated circuits 12 and 14 forming the logic module are respectively
It is configured to have a metal substrate body 46a. The integrated circuits 12 and 14 thus reduced in size and weight can be satisfactorily reduced in size without impairing the reduction in the size of the joint box 10 to which they are connected. .

Further, in one embodiment described above, the integrated circuit 12
The upper and lower surfaces are defined by a pair of circuit boards 40a and 40b. As a result, according to this embodiment, the number of parts of the integrated circuit 12 is reduced, and a small size and low cost are achieved.

Further, in this embodiment, the circuit boards 40a, 40
b is a conductive aluminum substrate body 46a, an insulating layer 46b stuck on the substrate body 46a, and an insulating layer 46b
And a conductive foil 46c stuck thereon in a predetermined circuit pattern. As a result, various circuit elements 46
The heat generated from d is generated by the aluminum substrate body 46a.
Can be used as a heat sink to dissipate heat.
There is no need to separately provide a heat radiating member, and a significant reduction in size can be achieved.

Further, in this embodiment, as described above, since the upper and lower surfaces of the case are each composed of a pair of circuit boards 40a and 40b having an aluminum substrate body 46a,
These circuit boards 40a and 40b can be used as electromagnetic shielding members. As a result, the internal space of the integrated circuit 12 on this case is substantially electromagnetically shielded, and the circuit element 46d is less susceptible to electromagnetic interference.

It is needless to say that the present invention is not limited to the configuration of the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, in the above-described embodiment, the integrated circuit 12 is described as functioning as an engine control unit. However, the present invention is not limited to this. For example, a vehicle speed control device, a control device for four-wheel steering, an automatic transmission, It can be configured to operate as each functional component such as a control device.

Further, in the above-described embodiment, the first and second integrated circuits 12 and 14 are described as the logic module. However, the present invention is not limited to this. Is possible. In this case, as described above, since the integrated circuit has a metal substrate main body and the internal wiring is performed by multiplex communication, even if the number of integrated circuits to be connected is increased, It is not necessary to increase the size of the joint box, and a sufficiently miniaturized configuration can be maintained.

[Effects of the Invention] As described in detail above, the integrated circuit mounting device having a metal substrate according to the present invention is formed so as to have independent control functions, and is provided on the metal substrate via an insulating layer. A plurality of integrated circuits each having a metal substrate on which a conductive foil is adhered and a circuit element is fixed are simultaneously mounted and electrically connected to a connection box, and the connection box is disposed in the connection box. A multiplex transmission means for connecting the integrated circuit and the controlled unit by multiplex transmission is provided.

Further, in the integrated circuit mounting device having a metal substrate according to the present invention, the metal substrate is formed by dividing one common substrate into a plurality, and each of the plurality of substrates is connected via a flexible circuit board. It is characterized by being.

Therefore, according to the present invention, there is provided an integrated circuit mounting device having a metal substrate, which can reduce the size of the connection box to which the integrated circuit is connected.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the configuration of an embodiment of an integrated circuit mounting device having a metal substrate according to the present invention; FIG. 2 is a perspective view showing the configuration of the integrated circuit shown in FIG. 1; FIG. 4A is an exploded perspective view showing the configuration of the integrated circuit shown in FIG. 1; FIG. 4A is a cross-sectional view taken along line AA in FIG. 2; FIG. 4B is a line BB in FIG. FIG. 5A is a plan view showing the configuration of a common board; FIG. 5B is a cross-sectional view showing the configuration of a common board; FIG. 6 is a view showing the configuration of a male connector attached to an integrated circuit; FIG. 7 is a perspective view schematically showing a configuration of a joint box on which an integrated circuit is mounted. In the figure, 10 mounting device, 12; 14 integrated circuit, 12a; 14a
... control circuit, 12b; 14b ... multiplex communication interface circuit, 16; 18; 20 ... connector mechanism, 40a; 18a; 20a ... male connector, 16b; 18b; 20b ... female connector, 22 ... Multiplexed harness, 24 ... Multiplexed unit, 26; 10; 30 ... Connector mechanism, 26a; 10a; 30a ... Male connector, 26b; 10b; 30b
…… Female connector, 32; 34; 36 …… Harness, 38 …… Multiplexed interface circuit, 40a; 40b …… Circuit board, 42…
... side plate, 42a; 42b ... step, 44 ... frame, 44a ... body,
44b; 44c ... flange part, 44d ... left part, 44e ... right part, 46 ... common board, 46a ... board body, 46b ... insulating layer, 46c ... conductive foil, 46d ... circuit element, 46e …… Opening, 46f …… Flexible circuit board, 46g; 46h; 46i; 46j…
... Connection terminal, 48a; 48b; 48c; 48d ... Connection pin, 50 ... Seal rubber, 52 ... Connector body, 52a ... Standing piece, 52
b; 52c; 52d; 52e... are through holes.

Claims (2)

(57) [Claims] 1. A plurality of integrated circuits having a metal substrate, each of which is formed so as to have an independent control function, and a circuit element is fixed by attaching a conductive foil to the metal substrate via an insulating layer. A connection box in which circuits are simultaneously mounted and electrically connected; and multiplex transmission means disposed in the connection box and connecting the plurality of integrated circuits and the controlled unit by multiplex transmission. A mounting device for an integrated circuit having a metal substrate. 2. The method according to claim 1, wherein the metal substrate is formed by dividing one common substrate into a plurality, and each of the plurality of substrates is connected via a flexible circuit board. A mounting device for an integrated circuit having the metal substrate according to claim 1.