JPH10189229A - Sheet heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of mounting a flexible heater to a metal base plate, enhance heat resistance and heat efficiency to enable miniaturization and extended service life, and ensure cost reduction. SOLUTION: Into a recessed part of a resin cover 4 for heat radiation prevention whose sectional shape is recessed, having a shape repeatedly dent flatly, and having a plurality of lock parts 5 on a side face, an insulation covered flexible heater 6 is housed so as to retract a connection lead part 6d from both ends. That resin cover 4 is loaded on a metal base plate 1 so that the flexible heater 6 comes into close contact with the metal base 1, a cut and lifted-up claw 3 provided on the metal base plate 1 is bent and pushed to the lock parts 5, and a resin cover 4 is fixed to the metal base plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar heater used for, for example, dehumidifying copying paper.

[0002]

2. Description of the Related Art Conventionally, this type of planar heater is configured as shown in FIG. Reference numeral 11 denotes a metal base plate having mounting holes 12 at four corners, and reference numeral 13 denotes a flexible heater having an insulating coating which is folded back on the metal base plate 11 in a waveform, and both ends of which are drawn out as connection lead portions 13a. Numeral 14 denotes an adhesive tape for sticking the creeped flexible heater 13 to the metal base plate 11, using a silicone-based or fluorine-based resin sheet or an aluminum foil adhesive tape.

[0003]

However, in the above-described conventional structure, the flexible heater 13 bent in a waveform tends to return to a straight line in the step of attaching the flexible heater 13 on the metal base plate 11. Therefore, it takes a long time to perform the attaching operation using the adhesive tape. Further, the heat resistance of the fluororesin sheet is up to about 250 ° C., but since the adhesive strength of the pressure-sensitive adhesive tape decreases with an increase in temperature, the use limit is at most about 180 ° C. Therefore, there has been a problem that when used for a long time at a high temperature, the heat resistance is deteriorated and the life is shortened.

The present invention has been made to solve the above-mentioned problems of the prior art, and has good workability in mounting a flexible heater on a metal base plate, and has improved heat resistance and thermal efficiency to reduce the size and extend the life. It is an object of the present invention to provide a planar heater capable of reducing the cost and further reducing the cost.

[0005]

In order to achieve this object, a planar heater according to the present invention comprises: a metal base plate having a plurality of cut-and-raised claws at predetermined positions; A flexible cover with a resin cover for preventing heat dissipation, which has a shape that is repeatedly bent when viewed, and has a plurality of locking portions on the side surface, and an insulating coating that is housed in the concave portion of the resin cover and has connection leads drawn out from both ends. The flexible heater is brought into close contact with the metal base plate, the upper portion thereof is covered with a resin cover, the locking portion is cut and raised, and is held down by bending the claws to fix the resin cover to the metal base plate.

In the above configuration, the flexible heater is placed on the metal base plate side with the flexible heater inserted in the concave portion of the resin cover, so that the flexible heater adheres to the metal base plate while maintaining a predetermined shape. The fixing of the resin cover is performed in such a manner that a cut-and-raised claw formed in advance in accordance with the shape of the resin cover is pressed against the engaging portion of the resin cover, so that the mounting operation becomes very easy.

Further, if a heat-resistant fluorinated resin molded product is used as the resin cover, the temperature range for use can be extended up to about 250 ° C. since no adhesive tape is used, and furthermore, heat dissipation to the outside is possible. , Heat generated is almost transferred to the metal base plate, and thermal efficiency is improved. Therefore, miniaturization and cost reduction can be achieved.

[0008]

Embodiments of the present invention will be described below in detail. FIG. 1 shows a planar heater according to an embodiment of the present invention, wherein 1 is a metal base plate having mounting holes 2 at four corners, and as shown in FIG. A cut-and-raised claw 3 is provided.

As shown in FIG. 3, reference numeral 4 denotes a resin cover for preventing heat dissipation, which has a concave cross section, has a repeatedly bent shape when viewed in plan, and has a plurality of locking portions 5 on the side surface. ,
Reference numeral 6 denotes a flexible heater having an insulating coating, which is housed in the concave portion of the resin cover 4 and has connection lead portions 6d drawn out from both ends. As shown in FIG. 4, in the flexible heater 6, a heater wire 6b is wound around a core 6a made of glass fiber which maintains flexibility even at a high temperature, and a heat-resistant coating 6c, for example, a silicon-based or Fluoro resin coating is applied.

[0010] As shown in FIG. 5, a resin cover 4 in which a flexible heater 6 is placed on a metal base plate 1.
The flexible heater 6 is placed with the metal base plate 1 side, and the cut-and-raised claw 3 is bent and pressed onto the locking portion 5. Here, if the depth of the concave portion of the resin cover 4 is set slightly smaller than the diameter of the flexible heater 6, the flexible heater 6 is in close contact with the metal base plate 1,
The resin cover 4 is fixed to the metal base plate 1.

According to the present embodiment configured as described above, since the flexible heater 6 is fixed to the metal base plate 1 together with the resin cover 4 while maintaining a predetermined refraction shape, the mounting operation is very easy. become. In addition, since a heat-resistant resin cover is used to suppress the heat generated by the flexible heater 6 from dissipating into the air, most of the heat is transmitted to the metal base plate 1, thereby improving the heat use efficiency and increasing the operating temperature. The range extends to higher temperatures.

[0012]

As described above, according to the present invention,
The following effects are obtained.

Since the heat dissipation is small and the efficiency of heat transfer to the metal base plate is high, the length of the expensive flexible heater can be reduced to ２〜 to よ り of that of the conventional flexible heater.

The workability of attaching the flexible heater to the metal base plate is improved, so that the productivity is reduced by about 2
Up to double.

By applying the resin cover, the cost of the member can be reduced by about 1 / compared to the cost of the conventional adhesive tape.
2 can be reduced.

Since the fixing method using cut and raised claws instead of the adhesive tape is used, the operating temperature range is extended to high temperatures,
In addition, the service life can be extended.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a planar heater according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the metal base plate of the embodiment.

FIG. 3 is a partial perspective view of the resin cover of the embodiment.

FIG. 4 is a partial perspective view of the flexible heater according to the embodiment.

FIG. 5 is a cross-sectional view showing a structure for attaching a flexible heater to a metal base plate in the embodiment.

FIG. 6 is a perspective view showing a conventional planar heater.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Metal base plate, 3 ... Cut-and-raised claw, 4 ... Resin cover, 5 ... Locking part, 6 ... Flexible heater.

Claims (1)

[Claims] 1. A metal base plate having a plurality of cut-and-raised claws at predetermined positions, a heat base having a concave cross-sectional shape, a bent shape as viewed in plan, and a plurality of locking portions on a side surface. A resin cover for preventing radiation and a flexible heater of an insulating coating housed in the concave portion of the resin cover and having connection lead portions drawn out from both ends, the flexible heater is brought into close contact with the metal base plate, and A planar heater, wherein the planar heater is covered with the resin cover, and the locking portion is pressed down by bending and raising the claw to fix the resin cover to the metal base plate.