JP2559404Y2 - Film heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film heater, and more particularly, to improving the structure of a connecting portion with a lead wire to reduce the space occupancy of the connecting portion and to make the lead wires close to each other. Related to what can be arranged.

[0002]

2. Description of the Related Art A conventional film heater 101 has, for example, a configuration as shown in FIGS.
As shown in FIG. 11, the film heater 101 has a thin film shape as a whole, and its sectional structure is as shown in FIG. First, there is a base film 103, which is made of a PET film. On the base film 103, a heater pattern 105 composed of a predetermined linear pattern is provided. On the heater pattern 105, an overcoat 107 is provided.

A connection portion of the film heater 101 (FIG. 1)
In the leftmost part (1) 109, the heater pattern 1
05 is slightly wider, and connection terminals 110 and 112 are provided at its ends. The connection terminals 110 and 112 are subjected to the following connection processing. That is, as shown in FIG. 12, the reinforcing plate 111 is bonded and fixed to the rear surface side of the base film 103 with the adhesive 113. This reinforcing plate 111 is made of, for example, PE
It is composed of T film. Next, eyelets 115 are driven. The eyelets 115 are made of, for example, brass and have a hollow pipe shape as shown in the figure.

In the eyelet 115, a lead wire 117 is provided.
Is inserted and soldering is performed in that state (indicated by reference numeral 119 in the figure). Such connection processing is performed by connecting the two connection terminals 110 and 112 of the heater pattern 105.
In the same manner.

[0005]

According to the above conventional configuration, there are the following problems. First, the connection terminal 110,
There is a problem that the space occupation ratio of the connection portion including the connection portion 112 is high, and a large space is required for the connection portion. This is because the connection terminals 110 and 112 are installed in a relatively separated state as shown in the figure, and in this state, connection processing is performed to connect the lead wires 117 and 117. It is.

[0006] Further, although it is largely related to the above problem, since the lead wires 117 and 117 are connected and extended in a relatively separated state, it is difficult to perform wiring work thereafter. Also, there is a problem that a large space is required for wiring.

The present invention has been made based on such a point, and the object thereof is to reduce the space occupancy of the connecting portion and to arrange the lead wires close to each other. The object of the present invention is to provide a film heater.

[0008]

In order to solve the above-mentioned problems, a film heater according to the present invention comprises a base film,
A heater pattern that is provided on the base film in a predetermined linear pattern and to which a lead wire is connected with an end of the linear pattern as a connection terminal portion, wherein the connection terminal portion is provided. The space occupied by the connection portion provided with the connection terminal portion is reduced by bending and overlapping the portion provided. At this time, it is conceivable to arrange the connection terminal portion in a portion continuously extended from the heater pattern so that the portion of the heater pattern is not bent when the connection terminal portion is bent. Also, the connection terminal portions may be arranged at different positions in the extension direction so that the connection terminal portions do not overlap each other when the portion provided with the connection terminal portions is bent and overlapped. Conceivable. Further, it is conceivable to fix a state in which the portion provided with the connection terminal portion is bent and overlapped by various shrinkable tubes.

[0009]

First, in the case of the present invention, the size of the connection portion in the width direction is reduced by bending and overlapping the portion where the connection terminal portion is provided. This is to reduce the space occupancy. The dimension in the thickness direction is increased by folding and overlapping, but it is slight. In addition, when the connection terminal portion is disposed at a portion continuously extended from the heater pattern so that the portion of the heater pattern is not bent when bent, the portion of the connection terminal portion is bent. Also, the portion of the heater pattern is not bent, and the function as the heater is sufficiently exhibited. Also, when the connection terminal portions are arranged at different positions with respect to the extending direction, when the portion where the connection terminal portions are provided is bent and overlapped, the connection terminal portions do not overlap each other, and Can be reduced in size, and the space occupancy can be further reduced. Furthermore, if the portion where the connection terminal portion is provided is folded and fixed in the form of various shrinkable tubes, the wiring process becomes extremely simple, and it also leads to the realization of a waterproof structure. become.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention; FIG.
An embodiment will be described. First, the configuration of the film heater 1 before connection processing is described with reference to FIG. First, there is a base film 3 on which a predetermined heater pattern 5 is provided. An overcoat 7 is provided on the heater pattern 5. As the base film 3, for example, PET
Film (polyester film), polyimide film, polyphenylene sulfide film and the like are used. As the overcoat 7, for example, a laminate film is used, but the overcoat 7 may not be provided. Further, the heater pattern 5 is obtained by, for example, etching a metal such as aluminum, nickel chrome, and stainless steel.

At both ends of the heater pattern 5, lead wire connecting portions 9 and 11 are provided continuously. These lead wire connecting portions 9 and 11 have the same configuration as the heater pattern 5, but have a wider width than the heater pattern 5, and have a bent portion A or A '.
It is bent by 0 ° and is further extended by 90 ° by bending portions B and B ′. Note that the lead wire connecting portion 11 is also bent at 90 ° at the bent portions C and C ′. The ends of the lead wire connection portions 9 and 11 are connection terminal portions 13 and 15.
These connection terminal portions 13 and 15 are provided at different positions in the extension direction. In addition, the above-mentioned lead wire connecting portion 9,
Along 11, the base film 3 and the overcoat 7 are similarly extended.

The connection terminals 13, 15 are subjected to connection processing as shown in FIG. First, a reinforcing plate (for example, a PET film, a laminated plate, etc.) is provided on the back side of the base film 3.
17 is adhered and fixed by the adhesive 19. Next, the eyelets 21 are driven. The eyelets 21 are made of, for example, brass and have a hollow pipe shape as shown in the figure. The conductor portion of the lead wire 23 is inserted into the eyelet 21, and soldering is performed in that state (indicated by reference numeral 24 in the drawing). Such a connection process is similarly performed for the two connection terminal portions 13 and 15.

After performing the above-described connection processing, as shown in FIGS. 2 and 3, a protective film 25 is attached to a portion of the film heater 1 where the lead wire connecting portions 9 and 11 are extended. . The reason why the protective film 25 is attached is to reinforce the connection portion of the film heater 1 to increase the mechanical strength.
This is to ensure an insulation distance of 5. Film heater 1
After the protective film 25 is attached thereto, is bent along a fold curve 27 shown by a dashed line in FIGS. 1 and 2.
Then, in the bent state, as shown in FIG. 4, the heat-shrinkable tube 29 is covered and subjected to a predetermined heat treatment (heat shrinkage) to maintain the bent state. Note that a solvent desorption type shrink tube or the like may be used instead of the heat shrink tube 29. In short, any material that can maintain the bent state and exhibit the insulating function may be used.

As described above, the reason why the connecting portion of the film heater 1 is bent and the heat-shrinkable tube 29 is covered therewith is as follows. First, the connection terminals 13, 1
This is because the occupied space occupied by the connection portion of the film heater 1 centered at 5 is as small as possible. In addition, this is because the two lead wires 23, 23 are arranged as close to each other as possible and wiring is easy thereafter. In this case, since the connection terminals 13 and 15 are located at different positions in the extending direction, even if the connection portion is bent and the tube 29 is covered, the connection terminal portions 13 and 15 do not locally protrude greatly. A very small projection will appear in two places. FIG. 5 shows the internal state in a state where the connecting portion is bent and the tube 29 is covered.
And FIG.

According to the present embodiment, the following operations and effects can be obtained. First, the space occupied by the connection portion of the film heater 1 can be reduced. That is, by bending the connection terminal portions 13 and 15 along the folding curve 27, the widthwise dimension of the connection portion can be reduced to half. Further, the thickness of the portion does not become extremely large by bending. In particular, since the connection terminal portions 13 and 15 are arranged at different positions in the extension direction, when the connection portion is bent, the connection terminal portions 1 and 15 are bent.
The portions 3 and 15 do not overlap, and only relatively small protrusions are generated at two places. Therefore, concerns about interference with other devices are greatly reduced, and the assembling work is simplified.

Further, since the connecting portion is bent, the lead wires 23 are disposed in a state of being close to each other,
The subsequent wiring becomes easy, and the space required for the wiring is reduced. Also, protective film 2
By attaching 5, a waterproof structure can be realized by covering the heat-shrinkable tube 29, as well as securing the insulation distance between the connection terminal portions 13 and 15. That is, in order to obtain a waterproof structure in the related art, a complicated operation such as overlaying an insulating adhesive on a connection portion was required. In contrast, in the case of this embodiment, the waterproof structure can be easily obtained by the heat-shrinkable tube 29. If a double-shrinkable tube is used as the heat-shrinkable tube 29, a waterproof structure having a higher liquid density can be obtained.

Further, the adhesiveness of the film heater 1 to the object to be heated, particularly the adhesiveness of a portion including the heater pattern 5 functioning as a heating section, can be improved.
Thereby, the heating efficiency can be increased. That is, the connection terminal portions 13 and 15 of the heater pattern 5 are arranged at positions sufficiently distant from the heater pattern 5 of the film heater 1, and the mechanical influence via the connection terminal portions 13 and 15 is reduced. The configuration does not affect the pattern 5 portion. This is because the lead wire connecting portions 9 and 11 are provided at the ends of the heater pattern 5 and the connection terminal portions 13 and 15 are arranged at the ends of the lead wire connecting portions 9 and 11. Therefore, even if the connection terminal portions 13 and 15 are subjected to a connection process as shown in FIG. This is because the adhesiveness to an object is not impaired. In particular, bends A, A ',
In B, B ', C, C', etc., the lead wire connection portions 9, 11
Is extended together with the base film 3 and the overcoat 7, which greatly contributes to reducing the mechanical effect.

The rigidity of the portion where the lead wire connection portions 9 and 11 are provided is configured to gradually increase in the direction of the connection terminal portions 13 and 15. It is possible to effectively prevent the stress from being concentrated on the portion and deteriorating the soundness of the portion and hence the soundness of the film heater 1 itself. That is, in the first stage, the rigidity of the protective film 25 is slightly increased by attaching the protective film 25. Next, in the second stage, the reinforcing plate 17 is bonded to the connection terminal portions 13 and 15, and is folded and overlapped, and heat is applied. This is because the rigidity of the shrinkable tube 29 is further increased by covering it.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the case of this embodiment, the first
The following configuration is added to the configuration of the film heater 1 in the embodiment. First, the above-described protective film 25 is attached to the upper surface side of the film heater 1 in the drawing, and a similar protective film 31 is attached to the opposite side. Further, another reinforcing film 33 is attached to a part of the protective film 25 on the upper surface side. Other structures are the same as those of the first embodiment.

The reason for this is that the rigidity of the portion where the lead wire connecting portions 9 and 11 are provided is gradually increased by finer divisions than in the first embodiment. is there. That is, as the first stage, the rigidity is increased by the protective films 25 and 31. In the next stage, the rigidity is further increased by the reinforcing film 33. The connection terminals 13 and 15 have higher rigidity. As described above, since the rigidity is increased by finer divisions, it is possible to more effectively solve a problem due to a rapid change in rigidity, that is, a problem that stress is concentrated at a boundary portion and integrity is impaired. it can. In addition, this greatly contributes to securing the insulation distance between the connection terminals 13 and 15.

Next, a third embodiment of the present invention will be described with reference to FIG. In the case of this embodiment, by changing the linear pattern of the lead wire connecting portions 9 and 11 of the film heater 1,
The connection terminal portions 13 and 15 are arranged at positions different from those in the first and second embodiments. Again, in this case,
The connection terminal portions 13 and 15 are extended together with the base film 3 and the overcoat 7 and are sufficiently separated from the heater pattern 5 of the film heater 1.
The connection terminals 13, 1, 2 are bent twice at 90 ° by the bending portions A, A ′ and the bending portions B, B ′.
The same effects as in the above-described embodiments can be obtained, for example, such that the load acting via the heater 5 does not significantly affect the portion of the heater pattern 5 of the film heater 1. A fourth embodiment similar to the third embodiment will be described with reference to FIG. In the case of this embodiment, the shapes of the base film 3 and the overcoat 7 are changed in consideration of bending and overlapping the connection terminal portions 13 and 15.
That is, the base film 3 and the overcoat 7 have a shape in which the notch 35 is provided at the base end of the portion where the connection terminal portions 13 and 15 are provided. With this configuration, it is easy to perform the bending operation at the bent curve 27.

The present invention is not limited to the above embodiments. First, what kind of linear pattern is used to extend the lead wire connecting portions 9 and 11 is arbitrary. In short, it is possible to reduce the mechanical effect on the heater pattern by the extension distance, bending, and the like. Anything should do.
Further, the size may be determined in consideration of the subsequent wiring work according to the size, shape, and the like of the object to be heated. Further, in each of the above embodiments, the case where the number of the connection terminal portions is two has been described as an example. However, the number may be more, for example, four or six. In that case, the number of bends in the connection portion also increases, and at that time, the position is shifted so that the plurality of connection terminal portions do not overlap.

[0023]

As described above in detail, according to the film heater of the present invention, although the portion in which the connection terminal portion is provided is folded and overlapped, the dimension in the thickness direction of the connection portion is slightly increased. The dimension in the width direction can be significantly reduced, and as a result, the space occupancy of the connection portion can be reduced. In addition, when the connection terminal portion is disposed at a portion continuously extended from the heater pattern so that the portion of the heater pattern is not bent when bent, the portion of the connection terminal portion is bent. Also, the portion of the heater pattern is not bent, and the function as the heater is sufficiently exhibited. Also, when the connection terminal portions are arranged at different positions with respect to the extending direction, when the portion where the connection terminal portions are provided is bent and overlapped, the connection terminal portions do not overlap each other, and Can be prevented from increasing in size. Furthermore, if the state where the connection terminal portion is provided is bent and overlapped, and fixed by various shrinkable tubes, the wiring process becomes extremely simple, and also leads to the realization of a waterproof structure. The effect is great.

[Brief description of the drawings]

FIG. 1 is a plan view of a film heater according to a first embodiment of the present invention.

FIG. 2 is a view showing the first embodiment of the present invention, and is a partial plan view of the film heater with a protective film attached thereto.

FIG. 3 is a cross-sectional view showing a first embodiment of the present invention and showing a configuration of a connection process to a connection terminal unit.

FIG. 4 is a plan view of the first embodiment of the present invention, showing the film heater in a state where the connecting portion is bent.

FIG. 5 is a perspective view showing the inside of the tube in the first embodiment of the present invention.

FIG. 6 is a sectional view of the first embodiment of the present invention, taken along line VI-VI of FIG. 4;

FIG. 7 is a view showing a second embodiment of the present invention, and is a partial plan view of a film heater with a protective film and a reinforcing film attached thereto.

FIG. 8 is a view showing a second embodiment of the present invention, and is a view showing VIII-VII of FIG. 7;
It is I sectional drawing.

FIG. 9 is a cross-sectional view showing a second embodiment of the present invention and showing a configuration inside a tube.

FIG. 10 is a plan view of a film heater according to a third embodiment of the present invention.

FIG. 11 is a plan view of a film heater showing a conventional example.

FIG. 12 is a cross-sectional view illustrating a configuration of a connection process of a connection terminal unit in a diagram illustrating a conventional example.

FIG. 13 is a plan view of a film heater according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film heater 3 Base film 5 Heater pattern 13 Connection terminal part 15 Connection terminal part 23 Lead wire 27 Fold curve 29 Heat shrinkable tube

Claims (4)

(57) [Scope of request for utility model registration] 1. A film comprising: a base film; and a heater pattern provided on the base film in a predetermined linear pattern and connected to a lead wire using an end of the linear pattern as a connection terminal. A film heater characterized in that a portion in which the connection terminal portion is provided is bent and overlapped to reduce the space occupancy of the connection portion in which the connection terminal portion is provided. 2. The film heater according to claim 1, wherein the connection terminal portion is disposed on a portion continuously extended from the heater pattern so that the portion of the heater pattern is not bent when bent. A film heater. 3. The film heater according to claim 1, wherein the connection terminal portions are arranged at different positions in the extension direction, and a portion provided with the connection terminal portion is bent and overlapped. Wherein the connection terminal portions do not overlap each other when the film heater is used. 4. The film heater according to claim 1, wherein the portion where the connection terminal portion is provided is bent and the stacked state is fixed by various shrinkable tubes. A film heater characterized by the following.