JPH08203666A - Heating cooker - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention relates to a heating cooker having a heating control circuit such as a microwave oven and a gas oven, which can improve safety such as occurrence of short circuit on the circuit and noise resistance of a microcomputer. The object is to provide an improved heating cooker. [Structure] In the heating cooker of the present invention, the earth connection body 7 is electrically connected to the heating control circuit 6 and is in contact with the operation panel 3. With this configuration, even if the lead wire 10 is in a non-conducting state in the earth conduction path extending from the heating control circuit 6 to the device body 4, the heating control circuit 6 is connected to the device body 4 via the earth connection body 7. The conduction path can be surely secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker having a heating control circuit such as a microwave oven and a gas oven.

[0002]

2. Description of the Related Art This type of heating cooker using a 100V power source requires grounding work for safety, and the equipment body and the ground are used by being connected by a ground wire. On the other hand, inside the equipment, the circuit such as the heating control circuit is electrically connected to the equipment body, and in case of unsafe situation such as a short circuit, the equipment body is electrically connected to the ground to ensure safety. Although a microcomputer is mounted and heating control is performed, the conduction configuration is necessary in order to prevent an adverse effect (runaway, etc.) on the microcomputer due to noise from the outside of the device. For example, a lead wire is taken out from the heating control circuit, connected to the main body of the device, and further connected to the ground so that noise resistance can be improved.

[0003]

However, in the above-mentioned conventional configuration, that is, in the configuration in which the lead wire output from the heating control circuit is connected to the main body of the device only with screws or terminals, inspection,
When removing and reassembling the operation panel after repairing the operation panel, the lead wires may be forgotten or disconnected.
In this case, there is a problem that it is not possible to secure safety such as when a short circuit occurs on the heating control circuit and prevent unsafe mode such as runaway of the microcomputer due to noise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a heating cooker in which conduction between the heating control circuit and the main body of the device can be reliably performed and safety is improved.

[0005]

The cooking device according to the present invention comprises:
An input means for setting cooking conditions, a heating control circuit for controlling heating by a signal from the input means, an electrically insulating support provided between the input means and the heating control circuit, and the heating The control circuit is provided with a ground connection body and a grounding means for connecting the ground connection body and the apparatus main body, and the ground connection body has a contact portion that comes into internal contact with the operation panel.

Further, the contact portion of the earth connection body is provided near the inner surface curved corner of the operation panel.

[0007]

According to the present invention, with the above-described structure, even if the lead wire for connecting the earth connection body and the device body is forgotten or disconnected during the reassembly after the operation panel is removed for inspection or repair, Since the ground connection body is in contact with the operation panel made of a conductor, it is possible to reliably ensure continuity to the heating control circuit, the ground connection body, the operation panel, and the device body.

Further, since the contact portion of the grounding connection member is brought into contact with the vicinity of the curved corner of the inner surface of the operation panel, that is, the position where the paint does not wrap around to the inner surface due to overspray when the outer surface of the operation panel is painted, The conduction performance is further improved as compared with the case where the conduction is ensured by the first means.

Therefore, when a short circuit occurs on the heating control circuit, the safety against abnormal high voltage is ensured and the unsafe mode such as the runaway of the microcomputer due to the abnormal high voltage due to noise is prevented. Be more certain.

[0010]

Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a front view of a heating cooker. A heating chamber door 1 for accommodating an object to be cooked is provided on the substantially left side of the center, and adjacent to the right side is a heating input means. An operation panel 3 made of a conductor having a keyboard 2 is provided, and the exterior surface is painted for the sake of appearance and rust prevention.

FIG. 2 is a vertical sectional view of the operation panel 3 portion.
The operation panel 3 is screwed and fixed to the front surface of a device body 4 made of a conductor.

The operation panel 3 is provided with a keyboard 2 and a heating control circuit 6 in which a microcomputer is mounted via a non-conductive support body 5. Below the heating control circuit 6, a heating control circuit 6 is mounted. 6 and the contact portion 8 is brought into contact with the inner surface of the operation panel 3 so that the earth connection body 7
Is installed. The lead wire 10 connected to the lead wire connecting terminal 9 of the earth connection body 7 is screw-fastened to the device body 4, and a ground wire (not shown) is pulled out from the device body 4 and electrically connected to the ground. It is composed.

In use, a power plug (not shown) is turned on and the keyboard 2 is operated to enable cooking by heating a magnetron or a heater (not shown).

In the above structure, the ground connection body 7 contacts the inner surface of the operation panel 3 made of a conductor even if the lead wire 10 is forgotten to be connected or is disconnected due to disconnection due to some cause such as inspection or repair. Because of the configuration, the heating control circuit 6, the ground connection body 7, the operation panel 3, and the device body 4 are
When an abnormally high voltage is generated due to a short circuit or noise on the heating control circuit, the device body 4 is electrically connected to the ground to ensure the safety of the human body and the device. .

(Second Embodiment) A different point from the first embodiment is that the contact portion 8 of the grounding connector 7 is located in the vicinity of the bent corner of the inner surface of the operation panel 3.

The outer surface of the operation panel 3 is painted from the viewpoint of aesthetics and rust prevention, but the paint wraps around to the inner surface due to overspray in the painting process, and many paints especially on the inner flat portion. Adheres. On the other hand, the shaded bent corners are areas where there is little wraparound and no paint adheres.

In the structure of the second embodiment, the contact portion 8
Since it is arranged so as to be in contact with the operation panel 3 by arranging in the vicinity of a curved corner portion suitable for a conducting surface without the adhesion of paint, more reliable conduction can be obtained.

[0019]

As described above, according to the heating cooker of the present invention, in the earth conduction path from the heating control circuit to the main body of the equipment, a lead wire is forgotten to be connected or a non-conduction state occurs due to disconnection or the like. Even if it does, a reliable conduction path can be secured from the heating control circuit to the operation panel and the main unit of the equipment via the ground connection body, so safety is ensured when a short circuit occurs on the heating control circuit, and noise-caused micro This has the effect of preventing unsafe modes such as computer runaway.

Further, since the contact portion of the grounding connector is brought into contact with the inner surface of the operation panel in the vicinity of the curved corner of the inner surface where the paint is not adhered, the conduction path can be more surely secured and the above effect can be further enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a heating cooker according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an operation panel portion of the heating cooker.

[Explanation of symbols]

 2 input means (keyboard) 3 operation panel 4 device body 5 support 6 heating control circuit 7 ground connection 8 contact part

Claims (2)

[Claims] 1. An input means for setting cooking conditions, a heating control circuit for controlling heating by a signal from the input means, and an electrically insulating support provided between the input means and the heating control circuit. An operation panel having a body, a grounding connection body provided in the heating control circuit, and a grounding means for connecting the grounding connection body and a device main body, and the grounding connection body is a contact portion for internally contacting the operation panel. A cooking device having a structure. 2. The heating cooker according to claim 1, wherein the contact portion of the earth connection body is located near the inner surface of the operation panel.