JPH0337100B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a safety device for preventing malfunction of a high-frequency circuit equipped with an electronic circuit, and relates to a high-frequency heating device that is inexpensive, has excellent serviceability, durability, and is highly mass-producible. This provides the structure of the operation panel section.

Configuration of conventional example and its problems In FIG. 1, a general external perspective view of a high-frequency heating device, there is a door 3 at the front opening of the heating chamber 2 of the device main body 1, and an operation panel 4 is located near the door 3. be. The operation panel 4 includes a time display section 5, operation keys 6, an operation knob 7, a door opening button 8, and the like.

When using a high-frequency heating device, water may be accidentally splashed on the operation panel 4 of the product or spilled from above. At that time, various measures were taken to prevent equipment from malfunctioning and causing electronic circuits to become uncontrollable.

An example conventionally used is shown in FIG.

Between the upper part of the operation panel 4 and the main body exterior plate 9 1
If the aluminum foil tape 11 is not pasted between the operation panel 4 and the chassis 12 to prevent water from entering from 0 (arrow section), water will enter from the gap 13 and damage the electronic circuit board 14. Water was splashed on various parts 15, causing circuits to shoot out, causing malfunctions, and sometimes even causing the microcomputer 16 to become uncontrollable.

On the other hand, if the aluminum foil tape 11 is attached, it has some effect, but it is easily torn and may be turned over when the exterior plate 9 is attached, rendering it useless (even if it is turned over, the exterior plate 9 cannot be attached. Also, during service, the aluminum foil tape is difficult to peel off and may tear when removed, or even if it does not tear, try to apply tape 11 again at the end of service or during assembly. However, the adhesive was not strong enough and it was not easy to apply, and sometimes I even forgot to apply it.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and protects the operation panel from water that enters between the operation panel and the exterior plate by extending the sheet metal structure inside the operation panel. The purpose is to provide equipment with high safety and high productivity by preventing control circuits from becoming uncontrollable.

Structure of the Invention In order to achieve the above object, the high frequency heating device of the present invention includes an operation panel having various operation parts, an electronic circuit board attached to the inside of the operation panel, and a space between the electronic circuit board and the operation panel. The structure includes a back plate and an exterior plate made of a metallic sheet metal structure, and an extended portion of the upper end surface of the back plate is held between the exterior plate and the main body chassis, so that even if water intrudes, The present invention has the advantage that it does not spill onto the electronic circuit board, prevents the electronic circuit from becoming uncontrollable, and provides a device that is inexpensive, has a simple structure, and can be safely mass-produced.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a general external perspective view of a high-frequency heating device, there is a door 3 at the front opening of a heating chamber 2 of the main body 1 of the device, and an operation panel 4 is located near the door 3. The operation panel 4 includes a time display section 5, operation keys 6, an operation knob 7, a door opening button 8, and the like.

In FIG. 4, which is a longitudinal cross-sectional view of the operation panel 4 shown in FIG. It is attached.

The back plate 20 is fastened to the boss 21 of the operation panel 4 with screws 22. Below that, there is a sheet 23 for the operation keys 6, inside of which is a cover for the switch 25 on the board B24, and the operation panel 4
affixed to.

The board B24 has a boss 27 in the hole 26 of the back plate 20.
is passed through and tightened to the boss 27 with a screw.
Various parts 15, a microcomputer 16, a display tube 18, etc. are mounted on the electronic circuit board 14, and bosses 3 are installed in the holes 28 of the back plate 20 and the holes 29 of the board B24.
0 is passed through and tightened with screws to attach it to the operation panel 4.

The essential part of the present invention is that the end face of the tightening part of the screw 22 is bent at the upper part of the back plate 20 and extends further so that it rests on the upper end face of the chassis 12 of the main body. (See Figure 4) And the exterior plate 9
and the main body chassis 12.

Hereinafter, the effects of the above configuration will be explained.

When using the high frequency heating device, open the door 3, put the object to be heated into the heating chamber 2, close the door 3,
Select the type of cooking from the operation keys 6, for example, press "Electric Strong (High Output)" and set the time with the operation knob 7. The set time will appear on the display tube 18, and then press the operation keys 6. When you press the "start" button, the device starts oscillating high-frequency waves and starts heating the object to be heated. The display time on the display tube 18 also starts counting down, and after a predetermined time has elapsed, the display on the display tube 18 becomes "0", the high frequency oscillation also stops, and the heating ends.

For example, even if the object to be heated is placed on the top of the device and water is spilled on it before or after heating, the upper end of the back plate 20 (as shown by the arrow in Figure 4) will act as a cover and the Water does not sprinkle onto the circuit board 14. Also, during assembly or service, the aluminum tape shown in the conventional example shown in Figure 2 may be torn.
Also, forgetting to paste is not the case in this embodiment.

As described above, according to this embodiment, the sheet metal structure inside the operation panel 4 is extended to protect against water that enters between the operation panel 4 and the exterior plate 9, and the control circuit is controlled. Since it can be prevented from becoming inoperable, it has the effect of providing equipment that is both highly safe and highly mass-producible.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) It is possible to provide highly safe equipment because it protects against water that enters between the operation panel and the exterior plate and prevents the control circuit from becoming disabled.

(2) Since the sheet metal structure inside the operation panel can be extended to protect against water intrusion, the device is extremely simple and has high mass productivity in terms of ease of assembly and service.

(3) Conventionally, aluminum tape was pasted on the product, but the aluminum tape could be torn during servicing, torn during handling, or undetectable after the exterior plate was attached, or when reassembled after servicing.
Although it was not a perfect protection measure because the sticking force was reduced and it could not be stuck or sometimes it was forgotten to stick, the present invention makes it reliable, easy to assemble, mass-producible, and serviceable.

(4) Since it is sandwiched between the exterior plate and the chassis, it provides a reliable grounding, and the sheet metal structure inside the operation panel extends to areas susceptible to static electricity such as the display tube and is grounded. Therefore, the device becomes resistant to static electricity, making it even safer.

(If a device is susceptible to static electricity, it can destroy electronic circuits, cause the microcomputer to go out of control, and cause it to become uncontrollable.)

[Brief explanation of drawings]

Fig. 1 is an external perspective view of a general high-frequency heating device, Fig. 2 is a sectional view of the operation panel of a conventional high-frequency heating device, Fig. 3 is an exploded perspective view of Fig. 2, and Fig. 4 is an exploded perspective view of the conventional high-frequency heating device.
The figure is a longitudinal cross-sectional view of the operation panel section of a high-frequency heating device according to an embodiment of the present invention, and FIG. 5 is an exploded perspective view of FIG. 4. 1... Apparatus body, 2... Heating chamber, 3... Door,
4... Operation panel, 5... Time display section, 6... Operation keys, 7... Operation knob, 8... Door opening button, 9... Body exterior plate, 10... Gap, 11
... Aluminum foil tape, 12 ... Chassis, 13 ...
...Gap, 14...Electronic circuit board, 15...Various parts, 16...Microcomputer, 18...Display tube, 19...
...Acrylic cover, 20...Back board, 21...
Boss, 22...screw, 23...sheet, 24...
Board B, 25... switch, 26... hole, 27...
...boss, 28...hole, 29...hole, 30...boss.

Claims (1)

[Claims] 1. An operation panel having various operation parts, an electronic circuit board installed inside the operation panel,
The device includes a back plate made of a metallic sheet metal structure provided between the electronic circuit board and the operation panel, and an exterior plate, and a portion extending from the upper end surface of the back plate is arranged between the exterior plate and the main body chassis. A high-frequency heating device configured to be sandwiched between.