JP2000151123A - Electronic circuit unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electronic circuit unit which can reduce costs, facilitates assembling, and can improve resin charging. SOLUTION: A C-shaped attaching portion 2 as viewed from top is formed on a watertight connector 1, and a guide groove 3 is formed in the inner surface of the portion 2. One end of each of a plurality of terminals 4 provided on the connector 1 is bent such that the bent terminals can clamp an electronic circuit board 5. Then, the board 5 is inserted into the groove 3 to thereby clamp one end of the board 5 by the terminals 4, and the terminals 4 are brought into contact with a circuit conductor 6 formed on the board 5. Further, the board 5 is covered with a casing tube 7 made of vinyl, and a sealing resin for watertightness is charged into the tube 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic circuit unit which requires waterproofing, and more particularly to a structure of an electronic circuit unit which covers an electronic circuit board with a sealing resin.

[0002]

2. Description of the Related Art For example, an electronic circuit board on which an electronic circuit for controlling the ignition timing of a motorcycle engine is mounted, and a connector for connecting the electronic circuit board to a required portion are assembled. There is a unit, and since this electronic circuit unit is mounted on a portion that may be covered with water droplets when the motorcycle runs, it is necessary to have a waterproof structure.

[0003] In addition, electronic circuit units requiring a waterproof structure are used for home electric appliances such as washing machines, outdoor equipment, and the like. FIG. 5 is a perspective view before assembling showing a conventional electronic circuit unit requiring such a waterproof structure, and FIG. 6 is a sectional view after assembling. In the figure, reference numeral 21 denotes a waterproof connector formed to obtain waterproofness when connected to a mating connector, 22 denotes a mounting portion formed on the waterproof connector 21, 23 denotes a terminal of the waterproof connector 21, and 24 denotes a CPU.
An electronic circuit board mounted with an electronic circuit using electronic components such as
25 is a through hole provided in the electronic circuit board 24, 26 is a screw, 27 is a hard resin case, and 28 is a sealing resin for waterproofing.

[0004] To assemble this, a waterproof connector 21 is required.
One end of the electronic circuit board 24 is fixed to the mounting portion 22 formed with the screw 26, and one end of the terminal 23 of the waterproof connector 21 is inserted into a through hole 25 provided in the electronic circuit board 24 and connected by soldering. Fix it.
Thereafter, the electronic circuit board 24 is inserted into the case 27 through the opening thereof, and the case 2 is further inserted from the waterproof connector 21 side.
The assembly is completed by filling and curing the sealing resin 27 in the inside 6.

[0005]

However, in the above-mentioned prior art, since a hard resin case is used as an enclosure for filling a sealing resin for waterproofing, a mold dedicated to manufacturing the resin case is used. There is a problem that it becomes necessary and cost increases. In addition, it takes time and effort to fix the electronic circuit board at the board mounting portion of the waterproof connector with screws, and the workability of assembly is poor because the terminals of the waterproof connector must be soldered to the electronic circuit board. is there.

Further, since the sealing resin is filled from the side of the waterproof connector, the filling operation is difficult, and a gap is required between the waterproof connector and the resin case. In addition, there is a problem that reliable waterproofness cannot be obtained. Therefore, the present invention provides an electronic circuit unit that can reduce costs, is easy to assemble, has good workability, and has good workability for filling with a sealing resin, and is thin and has reliable water resistance. It is an object to realize the above.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an electronic circuit board having one end fixedly held to a waterproof connector, electrically connecting the electronic circuit board to a plurality of terminals of the waterproof connector, and In the electrical unit covering the entire electronic circuit board with a sealing resin for waterproofing, the waterproof connector is provided with a mounting portion having a U-shape in plan view, and a guide groove is formed on an inner surface of the mounting portion, and One end of the terminal is bent and formed into a shape capable of holding the electronic circuit board, and the electronic circuit board is inserted into the guide groove to hold one end of the electronic circuit board with the terminal and formed on the electronic circuit board. The terminals are respectively brought into contact with the circuit conductors, and the electronic circuit board is covered with an exterior tube, and the exterior sealing tube is filled with the sealing resin for waterproofing. And butterflies.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an electronic circuit unit according to a first embodiment of the present invention before assembling, and FIG. 2 is a sectional view after assembling. In the drawing, reference numeral 1 denotes a waterproof connector formed so as to obtain waterproofness when connected to a mating connector, 2 denotes a mounting portion formed on the waterproof connector 1 so that its planar shape is substantially U-shaped, 3
Is a guide groove provided on the inner surface of the mounting portion 2, and 4 is a plurality of terminals provided on the waterproof connector 1.
Is bent so that an electronic circuit board described below can be elastically sandwiched and held in the thickness direction.

Reference numeral 5 denotes an electronic circuit board on which electronic components such as a CPU are mounted, and a circuit conductor 6 for electrically connecting to the terminal 4 of the waterproof connector 1 is formed on one end surface of the electronic circuit board 5. . 7 is a vinyl exterior tube, 8
Is a sealing resin. These are assembled as follows.

First, both ends of the electronic circuit board 5 are fitted into a guide groove 3 formed in the mounting portion 2 of the waterproof connector 1 and inserted into the mounting portion 2 as it is. Thereby, one end of the electronic circuit board 5 is connected to the waterproof connector 1.
The electronic circuit board 5 is sandwiched between the terminals 4 of the waterproof connector 1.
The terminal 4 is in contact with and electrically connected to the circuit conductor 6 of the electronic circuit board 5, so that the electronic circuit board 5 is covered with the outer tube 7. One end of the tube 7 is fitted around the outer periphery of the mounting portion 2 of the waterproof connector 1.

At this time, the mounting portion 2 of the waterproof connector 1 and the exterior tube 7 are welded by heat or bonded by an adhesive. Thereafter, the sealing resin 8 is filled into the tube from the opening of the exterior tube 7 on the opposite side of the waterproof connector 1 and cured. According to the first embodiment described above, since the vinyl exterior tube 7 is used instead of the conventional hard resin case, a dedicated mold is not required and the cost can be reduced. .

Further, the electronic circuit board 5 can be fixed and held in the waterproof connector 1 only by fitting and inserting the electronic circuit board 5 into the guide groove 3 formed in the mounting portion 2 of the waterproof connector 1. Since the terminals of the connector 1 and the circuit conductors of the electronic circuit board 5 can be electrically connected, the assembling work is facilitated and the workability is improved. Furthermore, since the sealing resin 8 is filled from the opening of the exterior tube 7 on the opposite side of the waterproof connector 1, the filling operation is facilitated, and a gap needs to be provided between the waterproof connector 1 and the exterior tube 7. Since it is not necessary, it is possible to reduce the thickness and to obtain reliable waterproofness.

FIG. 3 is a perspective view showing a second embodiment of a vehicle electrical unit according to the present invention before assembling, and FIG. 4 is a sectional view after assembling. In the second embodiment, a soft elastomer resin is used in place of the vinyl tube 7 used in the first embodiment, and the exterior tube 9 made of the resin is hard resin of the waterproof connector 1 by a two-color molding technique. It is formed in advance integrally with the unit, and the other components are the same as those in the first embodiment.

When assembling the second embodiment with such a configuration, the electronic circuit board 5 is inserted through the opening of the exterior tube 9 on the opposite side of the waterproof connector 1 and further, one end of the electronic circuit board 5 is placed on both sides. Attachment part 2 of waterproof connector 1
Into the guide groove 3 formed in the
Insert until it hits the back. As a result, one end of the electronic circuit board 5 is sandwiched between the terminals 4 of the waterproof connector 1, the electronic circuit board 5 is fixed and held in the mounting portion 2 of the waterproof connector 1, and the terminals 4 are connected to the circuit conductors 6 of the electronic circuit board 5. After that, the sealing resin 8 is filled into the exterior tube 7 through the opening and cured, since it is in contact with and electrically connected.

In the second embodiment described above, the same effect as in the first embodiment can be obtained, and the exterior tube 9 is previously integrated with the hard resin portion of the waterproof connector 1 by a two-color molding technique. , More reliable waterproofness can be obtained.

[0016]

As described above, according to the present invention, one end of an electronic circuit board is fixedly held to a waterproof connector, and the electronic circuit board is electrically connected to a plurality of terminals of the waterproof connector. In the electrical equipment unit covering the entire electronic circuit board with a sealing resin for waterproofing, the waterproof connector is provided with a U-shaped mounting portion having a U-shaped planar shape, and a guide groove is formed on an inner surface of the mounting portion, and One end of the terminal was bent and formed into a shape capable of holding the electronic circuit board, and the electronic circuit board was inserted into the guide groove to hold one end of the electronic circuit board with the terminal, and formed on the electronic circuit board. Each of the terminals is brought into contact with a circuit conductor, the electronic circuit board is covered with an exterior tube, and the exterior sealing tube is filled with the waterproof sealing resin. .

Therefore, according to this, since a vinyl exterior tube is used in place of the conventional hard resin case, an exclusive mold is not required, and the cost can be reduced. . Further, the electronic circuit board can be fixedly held in the waterproof connector by simply inserting the electronic circuit board into the guide groove formed in the mounting portion of the waterproof connector, and the terminal of the waterproof connector and the circuit of the electronic circuit board can be fixed. Since the conductors can be electrically connected, the assembling work is facilitated, and the effect of improving workability is also obtained.

Furthermore, since the sealing resin is filled from the opening of the exterior tube opposite to the waterproof connector, the filling operation is facilitated, and there is no need to provide a gap between the waterproof connector and the exterior tube. As well as being thinner,
The effect that a certain waterproof property can be expected is also obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view before assembling showing a first embodiment of the present invention.

FIG. 2 is a sectional view after assembling showing the first embodiment.

FIG. 3 is a perspective view before assembling showing a second embodiment of the present invention.

FIG. 4 is a sectional view after assembling showing a second embodiment.

FIG. 5 is a perspective view showing a conventional example before assembly.

FIG. 6 is a cross-sectional view showing a conventional example after assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof connector 2 Mounting part 3 Guide groove 4 Terminal 5 Electronic circuit board 6 Circuit conductor 7 Exterior tube 8 Sealing resin 9 Exterior tube

Claims (3)

[Claims] An electronic circuit board is fixedly held at one end to a waterproof connector, the electronic circuit board is electrically connected to a plurality of terminals of the waterproof connector, and the entire electronic circuit board is sealed for waterproofing. An electronic circuit unit covered with a sealing resin, wherein the waterproof connector is provided with a U-shaped mounting portion in a planar shape, a guide groove is formed on an inner surface of the mounting portion, and one end of the plurality of terminals is connected to the electronic circuit board The electronic circuit board is inserted into the guide groove so that one end of the electronic circuit board is sandwiched between the terminals, and the terminals are respectively contacted with circuit conductors formed on the electronic circuit board. An electronic circuit unit, wherein the electronic circuit board is covered with an exterior tube, and the exterior sealing tube is filled with the waterproof sealing resin. 2. The electronic circuit board according to claim 1, wherein the electronic circuit board is inserted into a guide groove provided in a mounting portion of the waterproof connector, and one end of the electronic circuit board is sandwiched between terminals of the waterproof connector. After each of the terminals is brought into contact with the circuit conductor formed in the above, the electronic circuit board is covered with a vinyl exterior tube, and one end of the exterior tube is attached to a mounting portion of the waterproof connector. An electronic circuit unit characterized by being filled with a sealing resin for waterproofing. 3. The exterior tube according to claim 1, wherein an exterior tube made of an elastomer resin is integrally formed with a mounting portion of the waterproof connector, an electronic circuit board is inserted into the exterior tube, and the electronic circuit substrate is further attached to the mounting portion. After inserting one end of the electronic circuit board between the terminals of the waterproof connector and bringing the terminals into contact with the circuit conductors formed on the electronic circuit board, An electronic circuit unit characterized by being filled with a sealing resin for waterproofing.