JP2855374B2 - control unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control unit for centrally controlling on-vehicle electronic devices and the like.

[0002]

2. Description of the Related Art Conventionally, the following control units have been known. That is, as shown in FIG.
Four sides 1a, 1b, 1c, 1d made of aluminum die-cast
And a case 3 composed of resin upper and lower surfaces 2a and 2b,
As shown in FIG. 6, the printed circuit board 4 is housed, and various electronic components 5 are mounted on its surface. An opening 7 for projecting the connector 6 is formed on one side surface 1a of the case 3 (Japanese Utility Model Laid-Open No. 2-84388).
Further, the power device 8, which is a heat generating component, is connected to the other side 1c.
To provide heat dissipation.

[0003]

However, such a conventional control unit has a problem that it is heavy because the four sides of the case are formed of aluminum. This is contrary to the demand for lighter vehicles. In addition, since the mounting area of the electronic components is only the printed circuit board 4 housed in the case 3, the mounting density per control unit is low, and the control unit becomes large.

The present invention has been made in view of such conventional problems, and has as its object to reduce the weight and size of a control unit.

[0005]

In order to achieve the above object, the present invention provides a control unit having a printed circuit board housed in a case, wherein one side of the case is made of metal and the other part is made of resin. And the printed board is formed by laminating a rigid board and a flexible board, and one end of the flexible board is extended on an inner surface of one side of a metal made of the case. And join them.

[0006]

According to the above construction, one side of the case is made of metal, whereby the heat radiation effect can be maintained, and the other part of the case can be made of resin, so that the weight can be reduced. Also, extend the printed circuit board to one side,
The area where electronic components can be mounted is expanded. Therefore, the mounting density per control unit is increased, and downsizing can be achieved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS. As shown in FIG. 2, the case 3
a and the three sides 1a, 1b, 1d are made of resin
One side surface 1c is made of aluminum for the heat sink, and the lower surface 2b is made of resin for the lower lid.

As shown in FIG. 1, an opening 7 for projecting the connector 6 is formed on one side surface 1a of the case 3 as in the prior art. As shown in FIG. 3, the printed board 4 housed in the case 1 is composed of a rigid board 4a and a flexible board 4b adhered to an upper surface thereof (a hatched portion in the drawing). Is extended and attached to the inner surface of the side surface 1c (hatched portion in the figure). Then, the power device 8, which is a heat-generating component, is arranged in contact with the side surface 1c made of aluminum so as to maintain the heat radiation effect.

At the time of assembly, as shown in FIG. 4, the side surface 1c is fitted into a U-shaped frame 9 provided on the case 3 via a groove 10 (see FIG. 1). At this time, the flexible substrate 4
b denotes the vicinity A of the boundary between the rigid substrate 4a and the side surface 1c.
(See FIG. 3), and the lower surface 2b is fixed to the case 3 with screws. As described above, according to the present embodiment,
Since only the portion where the power device 8 is arranged is made of aluminum and the other portion of the case is made of resin while maintaining the heat radiation effect, the weight of the control unit can be reduced, and the printed circuit board 4 is formed on one side 1c. In this way, it is possible to perform surface mounting on this portion, and it is possible to secure a large mounting area for the electronic component 5 and increase the mounting density per control unit. The size can be reduced. Furthermore, since the control unit can be reduced in weight and size, the degree of freedom in layout is increased.
It can be installed in a place free from radio noise and radio interference.

[0010]

As described above, according to the present invention,
The weight of the control unit can be reduced while maintaining the heat radiation effect. Further, since the area of the printed circuit board is expanded to the side, the size of the control unit can be reduced.

Since the size and weight can be reduced in this way, the degree of freedom in layout can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a control unit showing one embodiment of the present invention.

FIG. 2 is a perspective view of the case.

FIG. 3 is a development view of a printed circuit board.

FIG. 4 is a side view of the case.

FIG. 5 is a perspective view of a conventional case.

FIG. 6 is a sectional view of a conventional control unit.

[Explanation of symbols]

 1c Metal side surface 3 Case 4a Rigid board 4b Flexible board 8 Power device

Claims (1)

(57) [Claims] 1. A formed by accommodating a printed circuit board in a case the control unit, one side surface of the case is made of metal, the other part with the resin, the printed circuit board, and the rigid plate and the flexible substrate
Was formed by stacking, further, the control unit, characterized in that said one end of the flexible substrate, and bonded to extend on the inner surface of the metallic one side of the case.