JPS631431Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field) The present invention relates to a sheet heating element.

(Background Art) Conventionally, a heating element unit of a planar heating element is formed as shown in FIGS. 6 and 7. That is, the heating element units 11 and 12 having two unit heating circuit patterns formed continuously in the longitudinal direction as shown in FIG. 6 are used by being folded back at the T-shaped cut portion 13 as shown in FIG. ing. Here, in FIGS. 6 and 7, 14 is a resection portion;
Reference numeral 15 denotes a terminal portion for connection to a controller block for temperature control, and the method of processing the lead wire 16 connected to the heating electrode in the heating element unit 11 is shown in FIG. In other words, as shown in FIG. However, this portion is covered with an insulating shrink tube 21.

The state in which the controller block 22 is connected to the sheet heating element thus formed is shown in Fig. 9. In Fig. 9, reference numeral 23 denotes a terminal cover.

However, in this example, since the insulating shrink tube 21 and the lead wire 16 ride on the controller block 22 at the terminal section, it is impossible to place electronic components in the vicinity, and the controller that houses the electronic components is inevitably Block 22
The disadvantage was that the terminal area became larger and the space in the terminal section could not be used effectively.

(Purpose of the invention) This invention was proposed in view of the above drawbacks.
The purpose of this is to overlap the multiple lead wires connected to the ends of the heating electrodes in the thickness direction of the heating element unit, thereby reducing the planar space of the terminals and increasing the number of electronics in the controller block. It is an object of the present invention to provide a planar heating element which can secure a sufficient mounting space for components and can downsize a controller block.

(Disclosure of the invention) The invention will be described below with reference to the drawings. FIG. 1 shows a heating element unit 1 of a planar heating element according to the present invention, and this heating element unit 1 is formed in two continuous pieces in the longitudinal direction as in the conventional case, and has a T-shaped cut portion 2. By folding the other heating element unit 1' through the heating element unit 1', the two heating element units can be used side by side. A heating electrode 3 is disposed inside one of the heating element units 1 so as to cover almost the entire area thereof, and the internal structure of the heating element unit 1 is similar to the cross-sectional structure shown in FIG.

A removed portion 1a is defined at the end of the heating element unit 1 near the cutting portion 2.
A bent portion 1b is formed adjacent to a. In addition, in the figure, 1c indicates a cutting line, and 1d indicates a folding line, and when the removed part 1a is cut and removed along the cutting line 1c, the edge of the folding part 1b and the folding line 1d are cut. It is necessary that a plurality of ends of the heating electrodes 3 be exposed at the edge of the heating element unit 1.

That is, in the present invention, after removing the removed portion 1a, the lead wires 4 are connected to the heating lines 3 facing the removed end face as shown in FIG. 2, and the bent portion 1b is connected to the bent line 1d. 3, so that the insulation contraction tubes 5 of each lead wire 4 substantially overlap in the thickness direction of the heating element units 1 and 1', as shown in FIG. After that, the controller block 6, which has various electronic components mounted on the surface of a printed circuit board, etc., is placed in the space within the cutting line 1c, and the ends of the lead wires 4, which are almost overlapping each other, are shifted in a plane to connect the controller block 6 with the controller block 6. Perform the specified wiring. Thereafter, the controller block 6 and the soldered portions 4a of the lead wires 4 are covered with the terminal cover 7.

FIG. 5 is a sectional view of the insulating shrink tube 5 on the controller block 6. In this embodiment, the thickness _h1 in the vertical direction increases slightly as shown in FIG. Since the lateral length is shorter than in the example, the planar space occupied by the lead wire connection part in the controller block 6 can be narrowed, and in other words, the controller block 6 can be made smaller. . Further, for the controller block 6 of the same size as the conventional one, a large mounting space for electronic components can be secured.

Next, FIG. 4 shows another embodiment. In this embodiment, the upper and lower insulating coating tubes 5 are slightly shifted left and right and overlapped, so that the height _h2 can be increased as shown in FIG. It is lower than the case of (b), and the terminal part is made thinner.

In the above embodiment, the terminal portions are stacked in two layers, but by increasing the number of times of bending, it is possible to stack the terminal portions in three or four layers. In addition, when heating elements are stacked in this way, the amount of heat generated in the overlapped portion increases and the temperature rises abnormally, so it is necessary to
It is necessary to set the amount of heat generated to be smaller than other parts, such as 1/2 in the case of tiers and 1/3 in the case of 3 tiers.

(Effects of the invention) As described above, according to the invention, in a planar heating element comprising a heating element unit incorporating a heating electrode, the heating electrode is exposed by removing the end of the heating element unit. A lead wire is connected to each of the plurality of ends of the heating electrode, and a bent portion including a part of the plurality of ends of the heating electrode is bent to overlap the lead wire in the thickness direction of the heating element unit. Since the lead wires of the controller block are connected to the controller block, it is possible to secure a sufficient mounting space for electronic components in the controller block, and the controller block can also be made smaller than the conventional controller block.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention; Figures 1 and 2 are plan views, Figure 3 is an explanatory diagram of the main parts, and Figure 4 is another embodiment of the present invention. FIGS. 5A to 5C are explanatory diagrams of the effects of the present invention, FIGS. 6 to 9 show conventional examples, and FIGS. 6 and 7 are plan views; FIG. 8A is a plan view of the main part, FIG. 8B is a sectional view, and FIG. 9 is a plan view of the main part. 1, 1'... heating element unit, 1a... bending part,
3...Heating electrode, 4...Lead wire, 6...Controller block.

Claims (1)

[Scope of utility model registration request] In a planar heating element comprising a heating element unit with a built-in heating electrode, lead wires are respectively connected to the plurality of ends of the heating electrode exposed by removing the end of the heating element unit, and the heating element is heated. A surface characterized in that the bent portion including a part of the plurality of ends of the electrode is bent to overlap the lead wires in the thickness direction of the heating element unit, and these lead wires are connected to a controller block. shaped heating element.