Electric heater

Abstract

The present invention relates to an electric heater applied to a cooking appliance, and more particularly to an electric heater including a plane heating element capable of effectively lowering a heating temperature of an electrode portion even when an electrode portion is formed within a limited area. The present invention provides an electric heater including: a substrate (an insulating materialcapable of forming a conductor pattern on a surface of an insulating substrate); and a plane heating element configured to be formed on one surface of the substrate, wherein the plane heating elementincludes a pattern portion configured to connect a start point and an end point to each other; and an electrode portion configured to be connected to the start point and the end point of the patternportion, the electrode portion being formed to be thicker than the thickness of the pattern portion.

Description

technical field [0001] The present invention relates to an electric heater applied to cooking equipment, and in particular to an electric heater comprising a planar heating element which can effectively reduce the heat generation of the electrode part even if the electrode part is formed in a limited area temperature. Background technique [0002] Generally, cooking equipment is a device that uses gas or electricity to heat food to be cooked, and microwave ovens that use microwaves, ovens that use heaters, gas stoves that use gas, electric stoves that use electricity, and so on are widely used. There are various products such as cooktops with built-in gas stoves or electric stoves. [0003] For gas stoves, gas is used as a heat source to directly generate flames. On the contrary, electric stoves use gas and electricity to heat containers and food placed on the upper plate. [0004] For gas stoves, the heat loss caused by the flame is large, and pollutants are discharged an...

AI Technical Summary

Problems solved by technology

[0020] However, depending on the size of the cooking equipment, the required power requirements are different, but it is difficult to use only one heating wire to form a pattern that can be heated to a high temperature in stages according to the needs of the user.

[0021] Therefore, although it is possible to form a planar heater with a plurality of patterns and a plurality of electrodes, it needs to be arranged in a limited area.

[0022] However, in order to connect a plurality of electrodes to one power supply part, a plurality of electrodes can only be arranged adjacent to each other in the same direction within a limited area, and the width of the electrodes is formed to be larger than the width of the pattern, thereby improving the efficiency of the electrodes. The resistance of the

[0023] On the other hand, if a pattern that generates heat at a high temperature is formed in a limited area, there may be a problem that localized heat may occur depending on the shape of the pattern, or the heating wire may be destroyed due to it.

[0024] That is, depending on the shape of the pattern, there will be a difference in the path through which the current flows, and the greater the path difference, the greater the deviation in the current density, and local heating will occur in the part where the current density is high, and the phenomenon that the hot wire is destroyed

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