JPH04206295A - microwave oven - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a microwave oven having a radio wave leakage prevention device.

BACKGROUND OF THE INVENTION A conventional radio wave shielding structure for a microwave oven is such that the door is provided with a choke structure and a radio wave shield made of a metal plate such as punched metal having a large number of transparent holes.

Problems to be Solved by the Invention In such conventional microwave ovens, the door has a choke structure, making the door thick and heavy.

Additionally, there was a problem in that the range in which food etc. placed inside could be seen was narrowed. In order to solve this problem, the configuration shown in FIG. 6 was devised prior to the present invention.

The microwave oven A consists of a heating chamber 1, a door 2 having a see-through window, a radio wave shield 3, a storage section 4 for housing the radio wave shield 3, and a four-way structure 5, and the radio wave shield 3 is connected to the door. It is characterized in that it is stored when the door 2 is opened, and when the door 2 is closed, it covers the door part and blocks radio waves.

To explain in more detail, the opening of the heating chamber 1 is made of a metal plate 3 (made of 5US304 with a thickness of 0.1 mm and a thickness of 1.5 mm), which has a chi-four structure 5 and a large number of small holes as a radio wave shield.
The small holes are 2 cm in length and width. ), a storage section 4, and a radio wave shielding section consisting of a motor 6. door 2
When the switch A7 is closed, the motor 6 is driven and the metal plate 3 is lowered to the lowest position, and when the fixing fitting 8 provided at the bottom of the metal plate presses the switch B25, the radio wave source 1 is turned on.
It becomes possible to supply radio waves from 0 and can cook.

When the door 2 is opened, the switch A7 and the switch B9 are simultaneously turned off and the supply of radio waves is stopped, and the motor 6 is driven to wind up the metal plate 3 and store it in the storage section 4. This configuration eliminates the need for a radio wave shielding part such as a choke structure or punched metal that was provided on the door 2, making the transparent part of the door larger as in the microwave oven in Figure 8 than in the conventional microwave oven in Figure 9. The door can be opened easily, making it easy to see food placed inside, and the door can be made thinner and lighter.

However, in the above case, there is a problem that if foreign matter such as food residue or garbage gets into the gap between the lower choke structure 5 part 2 where the switch B9 is located, the fixing metal fitting 8 will not be able to press the switch B9 and radio waves will not be supplied. there were. An object of the present invention is to provide a microwave oven that solves the above problems.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a structure of a radio wave shielding section devised prior to the present invention, in which a foreign object prevention device is provided to cover the gap in the choke structure section. be.

Function The present invention has the above-mentioned foreign object prevention device covering the gap in the choke structure to prevent foreign objects such as food and garbage from entering.
Switch B9 can operate smoothly. Therefore, radio waves are reliably supplied.

EXAMPLE Hereinafter, an example of the present invention will be explained. The microwave oven of the present invention, as shown in FIG. 1, has almost the same configuration as that shown in FIG. 6, which was considered prior to the present invention. The difference is that in the present invention, a foreign object prevention device 11 is provided to cover the gap between the lower choke structure 5. The foreign object prevention device 11 connects elastic rubber to the choke structure 5 and the switch B.
It is attached to the gap between 9 and 9. Specific examples will be shown below.

Example 1 In this example, a case will be described in which a metal plate having a large number of small holes is used as a radio wave shield and elastic rubber is used as a foreign object prevention device. In Figure 1, when the door is closed, switch A
7 enters, the motor 6 is driven, the metal plate 3 is lowered, and the second
As shown in the figure, a fixing fitting 8 provided at the bottom of the metal plate
When the user presses down the elastic rubber 11 shown in FIG. 2 and turns on the switch B9, radio waves can be supplied from the radio wave supply StO, and cooking can be started. When the door is opened, switch A7 and switch B9 are simultaneously cut off and the supply of radio waves is stopped, the motor 6 is driven and the metal plate 3 is rolled up, the elastic rubber 11 is returned to its original position, and the metal plate 3 is moved to the metal plate storage section. It is stored in 4. Therefore, the elastic rubber 11 can prevent foreign matter such as leftover food or dirt from entering the gap between the choke structure 5 and the switch 9.

In addition, as the elastic rubber, heat-resistant and oil-resistant nitrile rubber, silicone rubber, acrylic rubber, fluoro rubber, etc. are preferable.

Since the door 2 is made of tempered glass, the inside can be seen over almost the entire area. The handle 12 is attached to tempered glass using PP. Therefore, the door 2 is thin and lightweight.

The fixing fitting 8 is used to prevent the end face from being deformed since the metal body 3 is as thin as O and bwa.

In this embodiment, a case has been described in which a so-called punching metal having a large number of small holes in a metal plate is used as the radio wave shielding body 3 as shown in FIG. 7, but the present invention is not limited to this. Any transparent metal body, such as a mensch or lath mesh made of thin metal wires, can be used.

Further, as the foreign object prevention device 11, any material other than rubber may be used as long as it is stretchable, and crepe-processed nonwoven fabric, metal, or stretchable woven fabric may also be used.

Embodiment 2 As the foreign object prevention device 11, two sheets of elastic rubber are pasted to the gap between the choke structure 5 and the switch 9.

The end faces of the two sheets are in close contact with each other, and the metal plate 3 serving as the radio wave shielding layer passes between the rubber plates when ascending and descending. When the metal plate 3 rises, it is when the door is opened and food etc. are taken in and taken out. At this time, the end surfaces of the elastic rubber 11 are in close contact with each other to prevent foreign matter such as food residue and dirt from entering. When the metal plate 3 descends to the bottom, it is time to perform microwave cooking. At this time, the elastic rubber 11 and the metal plate 3 are in close contact with each other to prevent foreign matter such as food residue and garbage from entering.

Embodiment 3 As a foreign object prevention device 11, the gap between the lower choke structure 5 is covered with a plate-like body 14, and one end of this plate-like body 14 is fixed so that it can be opened and closed in conjunction with the top and bottom of the metal body 3. This is also good because it closes the gap on the door side of the metal plate 3 as shown in FIG. 5 when radio waves are supplied, thereby preventing foreign matter such as leftover food or dust from entering.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the foreign matter prevention device provided to cover the gap in the choke structure prevents foreign matter such as food residue and garbage from entering the choke structure. can be prevented. Therefore, it is possible to eliminate the possibility that cooking cannot be performed due to the inability to supply radio waves due to a malfunction of the switch, and it is possible to provide a highly reliable device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an outline of an embodiment of the microwave oven of the present invention, FIG. 2 is an enlarged sectional view of essential parts of an embodiment of the present invention,
FIG. 3 is an enlarged sectional view of main parts of another embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of a main part of another embodiment of the present invention, FIG. 5 is a sectional view for explaining the operation of FIG. 4, and FIG. 6 is an embodiment of the technology considered prior to the present invention. 7 is a schematic view of a metal plate having a large number of small holes, FIG. 8 is an external perspective view of the present invention, and FIG. 9 is an external perspective view of a conventional example. A...Microwave oven, 1...Heating chamber, 2
...Door, 3...Radio wave shield, 4...
...Storage section, 5...Choke structure, 11.
...Foreign object prevention device. Name of agent: Patent attorney Akira Okaji and two others A---
Microwave oven 1 - Part 2 - Door 3 - Body 4 - Storage part 1 rlA5 - 11 Chiyoke body 11 --- Abnormal aP prevention table 1 Cancer 5 Figure [6 Figure

Claims (1)

[Claims] A heating chamber, a door having a see-through window, a radio wave shield that covers the door during cooking and is stored when not cooking, a housing portion of the radio wave shield, a choke structure, and a gap between the choke structure. A microwave oven consisting of a foreign object prevention device.