JPH02223185A - Top plate for electromagnetic cooker - Google Patents

Abstract

PURPOSE:To largely display the temperature change of a top plate with the color change and improve safety by coating a paint containing a metal on the upper face of a main body, and coating a thermo-paint on it. CONSTITUTION:An electromagnetic coil 12 is arranged below a top plate main body 11, and a paint 13 containing a metal is coated on the upper face of the top plate main body 11. A thermo-paint 14 is coated on the paint 13, and this thermo-paint 14 is discolored from a yellow color to a reddish brown color by sensing the temperature change. When heating is stopped and the temperature is decreased, the color is reversibly changed. The temperature change of the top plate can be correctly found via visual observation, a burn is prevented, and safety can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a top plate for an electromagnetic cooker, and more specifically to a top plate for an electromagnetic cooker, for example, a Mm cooker, or a multifunctional cooking table incorporating an electromagnetic cooker. The present invention relates to a top plate for an electromagnetic cooker used in, etc.

Traditionally, some top plates for this type of electromagnetic cooker have a residual heat indicator for safety reasons such as preventing burns.

This residual heat display includes display devices using shape memory alloys and display devices that display color changes using thermo paint alone.

In the case of display devices using conventional shape memory alloys mentioned above, the display area is small. There were problems such as the need for special measures.

Furthermore, in the case of using only thermopaint, the temperature change of the top plate was small, so the color change did not appear much, and the visual effect was small.

Organic temperature-indicating materials can be used when the temperature change occurs in a low-temperature range and the width of the change is small, but when the top plate temperature rises to several hundred degrees, such as in an electromagnetic cooker, reversible materials may be used. There was a problem that I lost it and couldn't use it.

The present invention was invented in view of the above-mentioned problems, and is a top for an electromagnetic cooker that can greatly indicate temperature changes on the top plate by color changes, has a high visual effect, and has improved safety. The purpose is to provide plates.

In order to achieve the above-mentioned object, the top plate for an electromagnetic cooker according to the present invention has a metal-containing paint applied to the upper surface of the top plate main body, and a thermo paint is roughly applied over the paint. It is characterized by being coated.

Further, it is characterized in that the paint containing the metal is applied within the small object detection area.

According to the above configuration, when paint containing metal is electromagnetically heated, a large temperature change is transmitted to the thermo paint, resulting in a large color change of the thermo paint. Additionally, since the paint containing metal is applied within the small object detection area, if an object to be heated such as a pot is not placed on the top plate, the paint containing metal will be heated by induction. Never.

Embodiments of the top plate for an electromagnetic cooker according to the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a top plate main body, an electromagnetic coil 12 is arranged below this top plate main body 11, and a paint 13 containing metal is applied to the upper surface of the top plate main body 11. . This metal is made of iron, aluminum, etc., and is heated by induction when the electromagnetic cooker is activated. Also, the size of this paint 13 applied is set within the detection range of the small object detector of the electromagnetic cooker, and whether or not it is within the detection range of the small object detector is determined by the film thickness and area of the paint 13, in other words. It is determined not only by the volume but also by the weight of the metal contained in the paint 13. If an object to be heated (not shown) such as a pot is not placed on the top plate main body 11, the paint 13 is determined to be a small item that must not be heated, and induction heating will not occur. There is.

A thermopaint 14 is further applied to the upper surface of the paint 13, and this thermopaint 14 is formed using TlzCrO<, and changes in color from yellow to reddish brown when it senses changes in temperature.

This thermo paint 14 is yellow at room temperature, but 70
When the temperature rises to about 80°C to 80°C, the color changes to brownish-yellow, and when the temperature rises further to 200°C or higher, the color changes to reddish-brown. Heating is then stopped and the color changes reversibly as the temperature drops.

In the above-mentioned top plate for an electromagnetic cooker, if an object to be heated such as a pot is not placed on the top plate, the paint 13 is determined by the small object detector to be a small object that should not be heated, and is heated by induction. It never happens.

On the other hand, when an object to be heated such as a pot is placed on the top plate, induction heating occurs and eddy currents are generated in the paint 13, which heats the paint 13 along with the pan, causing the thermostat in contact with the paint 13 to heat up. The paint 14 is also heated and its temperature rises, resulting in a noticeable change in the color of the thermopaint 14.

Therefore, the temperature change of the top plate can be accurately known visually, and it is possible to prevent burns and the like, thereby improving safety.

As is clear from the above explanation, in the top plate for a train cooker according to the present invention, when the paint containing metal is electromagnetically heated, a large temperature change is transmitted to the thermopaint, and the color of the thermopaint changes. There will be major changes. Therefore, the temperature change of the top plate can be accurately known visually, and it is possible to prevent burns and the like, thereby improving safety.

Additionally, since the paint containing metal is applied within the small object detection area, if an object to be heated such as a pot is not placed on the top plate, the paint containing metal will be heated by induction. (No needless consumption of power.)

[Brief explanation of the drawing]

FIG. 1 is a partially omitted cross-sectional view showing an embodiment of the knob plate for an electromagnetic cooker according to the present invention. 11... Top plate body, 13... Paint, 14
...Thermo Paint Patent Applicant: Sharp Co., Ltd. Agent: Patent Attorney Ryuji Iuchi Figure 1

Claims (2)

[Claims] (1) A top plate for an electromagnetic cooker, characterized in that a paint containing metal is applied to the upper surface of the top plate body, and a thermopaint is further applied over the paint. (2) A top plate for an electromagnetic cooker, characterized in that the paint containing the metal according to claim 1 is applied within the small object detection area.