JPH0443989Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a microwave oven.

(b) Prior art In the conventional microwave oven as seen in Japanese Utility Model Publication No. 58-48965, there is no food on the removable food tray in the heating chamber, or there is no heating of both the food tray and the food. If you drive the magnetron when it is not indoors, there are drawbacks such as no-load operation and damage to the magnetron. However, there is a thin enamel layer on the surface of the food tray, and this enamel layer absorbs even a small amount of microwaves, so in the former state where only the food tray is in the heating chamber, the magnetron damage is reduced.

(c) Problems to be solved by the invention Therefore, it is desired to obtain a microwave oven in which damage to the magnetron is less likely to occur even if any of the above conditions occurs.

(d) Means for solving the problems The present invention provides a heating chamber, a microwave supply means for supplying microwaves into the heating chamber, a microwave absorber disposed at the bottom of the heating chamber, and a microwave absorber disposed within the heating chamber. A food placing plate is provided that is detachably arranged and covers the microwave absorber, and the placing plate includes a metal flat plate, and a thick glass material and a thin glass material placed on the upper and lower surfaces of the flat plate, respectively. It is characterized by being composed of.

(E) Effect According to the above means, when only the food placing plate is in the heating chamber, and when neither the food placing plate nor the food is in the heating chamber, the microwave is applied to the thick glass material and the microwave, respectively. It is absorbed by the wave absorber, and therefore damage to microwave supply means such as a magnetron can be prevented as much as possible even during so-called no-load operation.

(f) Examples The drawing shows a microwave oven according to an embodiment of the present invention.

1 is a heating chamber, 2 is a magnetron that supplies microwaves into the heating chamber, 3 is a microwave stirring stirrer, 4 is a recess formed in the bottom of the heating chamber 1, and 5 is a ceramic placed in the recess. A microwave absorber such as a dielectric material, 6 is a food placing plate, and the placing plate includes a metal flat plate 7 and a thick glass material 8 such as borosilicate glass placed on the upper and lower surfaces of the flat plate, respectively. and a thin glass material 9.

Thus, food is usually placed on the above-mentioned placing plate 6 and microwave heating of the food is performed. At this time, the microwave absorber 5 is covered with the flat metal plate 7, and the microwave is not absorbed by the microwave absorber 5. Further, the thick glass material 8 is exposed to microwaves, but this glass material 8 has a smaller dielectric loss than food, and when the glass material 8 and food are present at the same time, most of the microwaves are absorbed by the food. Ru. Therefore, the food can be sufficiently heated without any reduction in heating efficiency.

On the other hand, if microwave heating is performed when there is no food on the placing plate 6, that is, only the placing plate 6 is in the heating chamber 1, the microwave heats the thick glass material because there is no food. 8, the damage to the magnetron 2 is suppressed as much as possible.

Furthermore, if microwave heating is performed with neither the above-mentioned placing plate 6 nor the food in the heating chamber 1, the microwaves will be sufficiently absorbed by the above-mentioned microwave absorber 5, and the magnetron 2 will be damaged as much as possible. suppressed.

(g) Effects of the invention According to the invention, a practical microwave oven can be created that can prevent damage to the microwave supply means as much as possible even when microwave heating is performed in a so-called no-load state where there is no food. Can be provided.

[Brief explanation of drawings]

The drawing is a sectional view of a microwave oven according to an embodiment of the present invention. 1... Heating chamber, 2... Magnetron, 5... Microwave absorber, 6... Food placing plate, 7... Metal flat plate, 8... Thick glass material, 9... Thin glass material.

Claims (1)

[Scope of utility model registration request] a heating chamber, a microwave supply means for supplying microwaves into the heating chamber, a microwave absorber disposed at the bottom of the heating chamber, a food holder detachably disposed within the heating chamber and covering the microwave absorber; 1. A microwave oven comprising a placing plate, the placing plate comprising a flat metal plate, and a thick glass material and a thin glass material placed on the upper and lower surfaces of the flat plate, respectively.