JPS6231985A - Surface heater - Google Patents

Abstract

(57) [Abstract] 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 planar heater used as a heating source in equipment such as heaters, cookers, dryers, etc., and particularly relates to a planar heater using a hollow substrate. be.

Conventional technology In recent years, planar heaters have become thinner and more uniform in heating.

It has come into the spotlight as a heating element that meets the needs of applications such as far-infrared rays, and various planar heaters such as those shown below have been on the market.

2 Heno (1) A structure in which a heater is wound around an insulating substrate such as a mica board.

(2) A structure in which a conductive pattern is formed on an alumina substrate using a conductive paste such as tungsten, and then an alumina substrate is provided on top of the conductive pattern and integrally molded.

(3) It has a laminated structure in which a conductive pattern is formed between organic films such as silicone and polyimide. However, in these planar heaters, (1)
In this case, the heat transfer to the heated object was poor and the heater was not sealed, so there was a problem with moisture resistance.

In the case of (2), the strength of the electrical outlet terminal portion is weak and the heat capacity is large, so there is a problem that the start-up time is long.

Furthermore, in the case of (3), the heat resistance temperature was low and there was a problem with the life characteristics.

Therefore, in order to solve the above problem,
As shown in Japanese Patent No. 296, a planar heater using a one-piece substrate has been proposed.

The present inventors have further improved the planar heater using the hollow substrate described above, and have proposed a new planar heater using a heater element made of a smooth lath mesh metal foil.

As shown in FIG. 6, the planar heater proposed by the present inventors includes forming an insulating hollow layer 1a on a metal substrate 1b, and providing a heater coating layer 2 made of hollow material on the hollow substrate 1.
A heater element 3 made of a smooth lath mesh metal foil body and a part of an electrical outlet terminal plate 4 connected to the heater element 3 and made of a metal foil body are embedded in the heater coating layer 2. It has a similar structure.

Problems to be Solved by the Invention However, the planar heater shown in FIG. 6 has (1) a large heat capacity and slow heat transfer;

(2) There is a problem with electrical characteristics.

There was a drawback.

Therefore, in the heat treatment step performed for the purpose of closely fixing the heater element 3 with the heater coating layer 2,
If the thickness of the heater coating layer 2 is made thinner in order to suppress the heat capacity as much as possible, the heater element 3 will be exposed and the electrical characteristics will be adversely affected. If the thickness is increased, the heat capacity increases and the heat transfer to the object to be heated is slowed down, which have contradictory characteristics, and it has been difficult to solve the above problems at the same time.

The present invention solves these conventional problems,
The object of the present invention is to provide a planar heater that has excellent electrical characteristics and fast heat transfer.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention fixes a heater element made of a smooth lath mesh metal foil body in a groove previously formed in insulating mica, and It is integrated with a hollow substrate placed in one position.

Effect 6 According to the above configuration, the heater element made of a smooth glass mesh metal foil is inserted into the groove of the insulating mica, and is completely fixed in a sandwich-like manner by the insulating mica and the hollow substrate. In the groove made in the insulating mica,
Since the heater element has a buried structure, it does not move, and as a result, it has excellent electrical characteristics.

In fact, since the heater element is directly fixed to the hollow substrate, the heat of the heater element is quickly transferred to the hollow substrate, and as a result, heat transfer becomes faster.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6. In the figure, 11 is an insulating mica, and this insulating mica 11 is provided with grooves 11a in advance.

Reference numeral 12 denotes a heater element made of a smooth lath mesh metal foil body, and this heater element 12 is located in a groove 11a previously provided in the insulating mica 11, and is fixed in a six-beam configuration to prevent movement. . 13 is a hollow substrate in which an insulating hollow layer 13a is formed on a metal substrate 13b;
3 is located on the side of the insulating mica 11 having the heater element 12 and is integrated therewith.

On the other hand, an electrical outlet terminal plate 14 is connected to the heater element 12 by spot welding.

In the planar heater of the present invention having the above structure, the heater element 12 is
When the heater element 12 is energized, the heat from the heater element 12 is quickly transferred to the hollow substrate 13, and an object to be heated placed on the side of the hollow substrate 13 can be quickly heated.

Moreover, since the heater element 12 is completely fixed by the groove 11a provided in the insulating mica 11 and is covered with the hollow substrate 13, it has excellent electrical characteristics.

Effects of the Invention As is clear from the above description, according to the present invention, a heater element made of a smooth lath mesh metal foil body is fixed in a groove previously formed in insulating mica, and the heater element side is By positioning and integrating the hollow substrate, it is possible to provide a planar heater with excellent electrical properties and fast heat transfer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a planar heater showing an embodiment of the present invention;
Fig. 2 is an enlarged sectional view of the main part of the coplanar heater, Fig. 3 is a perspective view of insulating mica in the coplanar heater, Fig. 4 is a front view of the heater element in the coplanar heater, and Fig. 5 is the same. Ho 11 in the sheet heater...Insulating mica, 1
1a...groove, 12...heater element, 13...ho o board. Name of agent: Patent attorney Toshio Nakao and one other person
1 Figure jf--One funeral■ Red, Squid Figure 2/2-One-Gue L% Figure 3
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Claims (1)

[Claims] 1. A planar heater, characterized in that a heater element made of a smooth lath mesh metal foil is fixed in a groove previously provided in insulating mica, and a hollow substrate is placed on the side of the heater element to integrate the heater element.