JP2509880Y2 - Waterproof structure of electronic circuit unit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure of an electronic circuit unit such as a washing machine and a dryer, which has a display part such as a fluorescent display tube and a liquid crystal panel and requires a waterproof treatment.

[0002]

2. Description of the Related Art Conventionally, there are waterproof structures of electronic circuit units having display parts such as a fluorescent display tube and a liquid crystal panel as shown in FIGS. That is, in this waterproof structure, the display component 3 is covered with the dedicated component case 10, the inside of which is filled with the transparent sealing material 11, the waterproof property of the lead portion 3a of the display component 3, and the glass bonding portion of the display component 3. Maintains both waterproofness with the outside. On the other hand, the electronic circuit unit other than the display unit such as the display component 3 on the printed circuit board 1 is covered with a waterproofing case 4, and a urethane sealant 6 which is normally used is injected into the inside of the electronic circuit unit for waterproofing. . As described above, the waterproofing of the display component 3 is performed in a separate process from the waterproofing of the electronic circuit unit.

[0003]

However, in the above-mentioned conventional technique, the waterproofing process is performed in two steps, that is, the display component and the electronic circuit unit, and the work efficiency is poor, and the transparent seal expensive for waterproofing the display component is expensive. Since it requires wood, it has been a factor of high cost. Moreover, since the display surface is also sealed with the transparent sealing material, a high-level production technique for preventing the generation of bubbles when the sealing material is injected is required. Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to perform waterproof treatment of display components at the same time as waterproof treatment of the electronic circuit unit with inexpensive sealing material. (EN) Provided is a waterproof structure for an electronic circuit unit.

[0004]

In order to achieve the above object, in a waterproof structure of an electronic circuit unit according to the present invention, a waterproof case for waterproofing an electronic circuit unit having a display component is provided, When the sealing material for waterproofing is injected into the display part and the electronic circuit unit in the waterproofing case, a tape for preventing leakage of the sealing material is provided on the display surface of the display part and the case for waterproofing. It is characterized in that it is temporarily bonded to a part of.

[0005]

In the present invention having the above structure, the display surface of the display component is temporarily adhered with the leakage prevention tape, and if it is peeled off after waterproofing, the display surface is exposed to the outside, which is expensive. There is no need to use a transparent sealing material, and air bubbles do not enter the display surface. Further, since the waterproofing sealing material is injected into the display component and the electronic circuit unit to integrally perform the waterproofing treatment, it is possible to simultaneously perform the waterproofing treatment of the display component during the waterproofing treatment of the electronic circuit unit, thereby improving the work efficiency. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Note that the same or corresponding portions as those of the conventional configuration will be described using the same reference numerals as those in FIGS. 4 and 5.
1 to 3 show an embodiment of a waterproof structure for an electronic circuit unit according to the present invention. As shown in FIG. 3, the printed circuit board 1
Five insertion holes 1a and six lead holes 1b are formed in each of them, and the locking claws 2a of the display component holder 2 are inserted into the five insertion holes 1a. A display component 3 such as a fluorescent display tube or a liquid crystal panel is adhesively fixed to the display component holder 2 with a double-sided adhesive tape 5 attached to the bottom surface of the display component 3. The display component 3 has a display surface 3b and a side surface 3c, and the lead portion 3a is attached to the side surface 3c. The lead portion 3a is inserted into the lead hole 1b of the printed board 1 and soldered.

The printed circuit board 1 and the display component holder 2
The display component 3 is fitted and fixed with the waterproof case 4 shown in FIGS. 1 and 2, and the display surface 3 of the display component 3 is fixed.
b When the urethane-based sealant 6 as a waterproofing sealant is injected into the entire surface and a part of the waterproofing case 4 to close the gap between the display component 3 and the waterproofing case 4, the sealing material is sealed. A leak-prevention tape 7 is temporarily adhered to prevent the adhesion and leakage of the tape 6.

Next, the assembly process and waterproofing process of this embodiment will be described. First, the locking claw 2 of the display component holder 2
a is inserted into the insertion hole 1a of the printed board 1 and locked,
Next, the lead portion 3a of the display component 3 is inserted into the lead hole 1b of the printed board 1, and the display component 3 and the display component holder 2 are fixed with the double-sided adhesive tape 5 attached to the bottom surface of the display component 3. Then, the lead portion 3a of the display component 3 is soldered and electrically connected to the printed board 1.

In order to waterproof the electronic circuit unit assembled by the above procedure, the waterproof case 4 is fitted and fixed. Then, the leakage prevention tape 7 is temporarily adhered to the entire display surface 3b of the display component 3 and the gap between the display component 3 and the waterproof case 4 on one surface. This prevents the sealing material 6 from leaking when the urethane-based sealing material 6 as the waterproofing sealing material is injected from the inside, and also prevents the sealing material 6 from adhering to the display surface 3b. After that, the urethane sealing material 6 is used to waterproof the electronic circuit unit. That is, the urethane-based sealing material 6 is injected from the inside of the waterproof case 4. Next, after the urethane-based sealing material 6 is cured, the leak prevention tape 5
Peel and remove.

As described above, according to this embodiment, it is possible to waterproof the display component 3 only by using the semitransparent urethane-based sealing material 6 that is normally used, without using a transparent sealing material.

[0011]

As described above, according to the waterproof structure of the electronic circuit unit according to the present invention, it is not necessary to carry out the waterproof treatment of the display parts with the expensive transparent sealing material in a separate step,
Since it is possible to perform waterproofing of display parts at the same time as waterproofing of the electronic circuit unit with only the commonly used sealing material, work efficiency is increased and material cost is reduced.
The cost can be reduced. Further, according to the present invention, if the leakage prevention tape is peeled off and removed, the display surface of the display component is exposed to the outside, so that air bubbles are not mixed into the display surface as in the conventional case. As a result, defective products can be eliminated and a high-quality electronic circuit unit can be provided.
Further, since no advanced production technology is required to prevent the generation of bubbles, the equipment can be simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a waterproof structure of an electronic circuit unit according to the present invention.

FIG. 2 is a perspective view showing the appearance of FIG.

FIG. 3 is an exploded perspective view showing an electronic circuit unit of this embodiment.

FIG. 4 is a cross-sectional view showing a waterproof structure of a conventional electronic circuit unit.

5 is a perspective view showing the appearance of FIG. 4. FIG.

[Explanation of symbols]

 1 Printed circuit board 2 Display component holder 3 Display component 3a Lead part 3b Display surface 4 Waterproof treatment case 5 Double-sided adhesive tape 6 Urethane sealant 7 Leak prevention tape

Claims (1)

(57) [Scope of utility model registration request] 1. A waterproof treatment case for waterproofing an electronic circuit unit having a display component is provided, and when the sealant for waterproof treatment is injected into the display component and the electronic circuit unit in the waterproof treatment case, the sealant A waterproof structure for an electronic circuit unit, wherein a leak-preventing tape for preventing leaks is temporarily adhered to a display surface of the display component and a part of the waterproof case.