JPH0712908Y2 - Overheat detector with flat cable - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an overheat detecting element with a flat cable, which is attached to various kinds of equipment and cuts its circuit when the equipment is overheated. is there.

[Conventional technology]

When an abnormality occurs in a device, a member inside the device may have an abnormally high temperature.

In such a case, it is necessary to stop the operation of the device, and for this reason, it is detected that the part that may generate the high temperature becomes an abnormally high temperature, and thus the power is supplied to the device. Need to cut.

Here, conventionally, a thermostat or a thermocouple has been used to detect the abnormally high temperature.

[Problems to be solved by the device]

However, such a conventional thermostat or thermocouple has a problem that its structure is complicated, it is not suitable for downsizing, and its mounting work is complicated.

Further, when the portion that may generate the high temperature is a curved surface, it is difficult to attach the thermostat or the like to the member in close contact, and the abnormal high temperature cannot be detected immediately and accurately.

Further, in order to connect the thermostat or the like to another circuit board, it is necessary to attach a lead wire to the thermostat or the like by soldering or the like, which causes a problem that the work becomes complicated.

The present invention has been made in view of the above points, has a simple structure, can be made small and thin, and can be easily mounted.
Another object of the present invention is to provide an overheat detecting element with a flat cable that can be attached closely even on a curved surface and does not require lead wire attaching work.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides an overheat detecting element with a flat cable on one synthetic resin film,
At least two wiring patterns made of a pasty material are formed by screen printing, and an overheat detection pattern made of a pasty material that is welded and cut when a predetermined temperature is applied is connected by screen printing between the two wiring patterns. A flexible overheat detecting element substrate is formed and the film itself that constitutes the flexible overheat detecting element substrate is stretched, and all the wiring patterns are gathered on the stretched film and extended in parallel to the end thereof. To form a flat cable, and screen-print an insulating layer on the wiring pattern excluding the overheat detection pattern, the connection part of the overheat detection pattern to the wiring pattern, and the end of the wiring pattern pulled out on the flat cable. Insulation of the end of the wiring pattern And configure the uncoated portion as a terminal portion.

[Action]

By configuring the overheat detecting element with the flat cable as described above, the material forming the overheat detecting element with the flat cable becomes inexpensive, and its structure facilitates mounting on the device.

Further, since the overheat detecting element and the flat cable are integrally formed, when connecting the overheat detecting element to another circuit board, the work of connecting the lead wire to the overheat detecting element by soldering or the like becomes unnecessary. Further, since it is not necessary to solder a lead wire to the overheat detecting element, the overheat detecting element can be downsized and thinned.

In addition, since the overheat detection pattern, the wiring pattern, etc. are formed on the synthetic resin film, the overheat detection element is very thin, and the overheat detection element can be thinned and easily bent. Even if the mounting position is a curved surface, it can be easily attached in close contact with the curved surface.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to the drawings.

1A and 1B are views showing an overheat detecting element 1 with a flat cable according to the present invention, wherein FIG. 1A is a plan view and FIG.
Is a back view.

As shown in the figure, the overheat detecting element 1 with a flat cable includes a flexible overheat detecting element substrate 10 and a flat cable 20.

Here, the flexible overheat detection element substrate 10 has two wiring patterns 15 and 15 formed on a film made of synthetic resin, and the overheat detection pattern 11 is formed to connect the two wiring patterns 15 and 15. Is configured.

Further, the flat cable 20 has an extension portion of the wiring patterns 15 and 15 arranged alongside the wiring patterns 15 and 15 of the flexible overheat detecting element substrate 10 on the same synthetic resin film as the flexible overheat detecting element substrate 10. Has been done.

Reference numeral 17 is an insulating layer that protects the wiring patterns 15 and 15, and 18 is a terminal portion provided with the carbon layers 19 and 19. Reference numeral 21 shown in FIG. 2B is a pressure sensitive adhesive layer.

Next, a method of manufacturing the overheat detecting element 1 with the flat cable will be described with reference to FIGS. 3 (a) to 3 (c).

First, as shown in FIG.
Screen printing silver paste on 0 and wiring pattern 15,
Forming fifteen.

Here, as the film 100, various synthetic resin films suitable for applications such as polyester film are used. The wiring patterns 15 and 15 are not screen-printed, for example, the film 1
It may be formed by etching a metal layer such as an aluminum layer or a copper layer formed on 00 by a method such as adhesion or vapor deposition. The wiring patterns 15 and 15 may be made of various conductive materials other than the above.

Next, as shown in FIG. 3B, an overheat detection pattern 11 is formed by screen printing so as to connect the two wiring patterns 15, 15 on the film 100.

Here, the overheat detection pattern 11 is made of a conductive material that melts and cuts when a predetermined temperature is applied. That is, for example,
As a material of the overheat detection pattern 11, a heat-meltable matrix (for example, paraffin wax, polystyrene, rosin wax, acrylic, polyamide,
At least one of thermoplastic epoxy, polyurethane, terpene resin, polyvinyl acetate, ethylene-vinyl acetate copolymer resin, polyester, and a mixture of two or more kinds thereof)
Conductive particles (carbon, silver, copper, nickel) dispersed in a solvent (acetone, toluene, methanol, ethanol,
At least one of organic solvents such as IPA, solvent naphtha, ethyl acetate, butyl acetate, ethyl cellosolve, butyl cellosolve, ethyl carbitol, butyl carbitol, ethylene glycol, and ethylene glycol diacetate) is used.

Note that the material of the overheat detection pattern 11 is not limited to this, and may be other low melting point alloy or solder paste, etc. In short, it has the property of melting and cutting when a predetermined temperature is applied. Any material may be used as long as it is a material.

Next, as shown in FIG.
Before and after the formation of 1, 11, the carbon layers 19, 19 are formed on the lower ends of the wiring patterns 15, 15 to form the terminal portion 18. The carbon layers 19 and 19 are made of low-resistivity carbon in the wiring pattern 1
Formed by screen printing on 5,15.

Next, as shown in FIG. 3C, polyester is formed on the wiring patterns 15 and 15 excluding the portion where the overheat detection pattern 11 is connected to the wiring patterns 15 and 15 and the portion where the carbon layers 19 and 19 are formed. The insulating layer 17 is screen-printed. The material of the insulating layer 17 may be made of various synthetic resins such as polyester, polyurethane, epoxy and their composites.

Here, it goes without saying that various other materials can be used as the materials of the insulating layer 17 and the carbon layers 19 and 19, and the forming method is various methods other than screen printing, for example, using a vacuum deposition means or the like. Good.

Next, a pressure-sensitive adhesive layer 21 made of a double-sided tape is attached to the back surface of the film 100 (see FIG. 1 (b)). The pressure-sensitive adhesive layer 21 may be applied by screen printing or any other method.

Then, the overheat detecting element with a flat cable is die-cut from the film 100 to complete the overheat detecting element 1 with a flat cable shown in FIG.

FIG. 2 is a view showing another embodiment of the overheat detecting element 1 with a flat cable according to the present invention.

As shown in the figure, in this embodiment, unlike the above embodiment, metal terminal pieces 25, 25 are attached to the terminal portion 18 '.

Since the parts other than the terminal portion 18 'are the same as those of the embodiment shown in FIG. 1, the detailed description thereof will be omitted.

Here, in order to form the terminal portion 18 ', as shown in FIG. 4, the metal terminal pieces 25, 2 integrally formed with the supporting member 26 are formed.
5 is prepared, and the tip portions of the metal terminal pieces 25, 25 are placed on the ends of the wiring patterns 15, 15 via a conductive adhesive layer (in the case of this embodiment, the wiring patterns 15, 15). The carbon layers 19 and 19 shown in FIG. 1 (a) are not formed on the end portions of (1).

Next, the terminal fixing film 27 made of a synthetic resin film having the same quality as the film 100 is placed on the metal terminal pieces 25, 25 placed on the wiring patterns 15, 15.

Subsequently, a horn for ultrasonic wave emission (not shown) is placed on a portion where the metal terminal pieces 25, 25 are not located (portion 27a in FIG. 2 (a)), and ultrasonic waves are emitted from the horn, The terminal fixing film 27 and the film 100 are locally melted by ultrasonic heating, and metal terminal pieces 25, 25 are placed on the wiring patterns 15, 15.
Are firmly fixed by the contracting force of these synthetic resin films.

Next, by heating the portion of the metal terminal pieces 25, 25 from above the terminal fixing film 27 or the film 100 with a heating iron to melt the conductive adhesive layer, the metal terminal pieces 25, 25 are formed into the wiring pattern 15 Securely adheres to the upper part of the 15.

If the metal terminal pieces 25, 25 are cut along the line AA and the terminal fixing film 27 is cut at a predetermined portion, the terminal portion 18 '
Is completed.

If the metal terminal pieces 25, 25 are attached by the above method, the attaching work is easy and the connection strength is large.

Since the synthetic resin film is firmly melted and fixed by the ultrasonic heating, the bonding with the conductive adhesive may be omitted in some cases.

The terminal portion 18 'is not only strong in connection strength between the flat cable 20 and the metal terminal pieces 25, 25, but also the thickness of the film 100 and the metal terminal piece 25, which constitute the overheat detecting element 1 with the flat cable. 25 and terminal fixing film 27
And a slight thickness of the conductive adhesive layer and the wiring pattern 15 are added to form an extremely thin terminal structure.

Next, a method of using the overheat detecting element 1 with the flat cable will be described.

FIG. 5 is a diagram showing a usage state of the overheat detecting element 1 with a flat cable shown in FIG.

As shown in the figure, the detected object 20
The back surface of the flexible overheat detecting element substrate 10 is attached to a predetermined position of 0. At this time, the pressure-sensitive adhesive layer 21 is formed on the back surface.
Since it is formed, its attachment is easy. Then, by simply connecting the terminal portions 18 and 18 'at the ends of the flat cable 20 attached to the overheat detecting element 1 with the flat cable to the terminal connecting portions of the circuit board (not shown), the work for attaching the overheat detecting element 1 with the flat cable is performed. Ends.

If the temperature of the detected object 200 rises abnormally, the overheat detecting pattern 11 on the flexible overheat detecting element substrate 10 is melted and cut, and the abnormal rise in temperature can be detected.

Although the embodiment of the overheat detecting element with the flat cable according to the present invention has been described in detail above, the present invention is not limited to this, and the material, shape, etc. of each component are used in
Various changes can be made depending on the price, etc. For example, the length and shape of the flat cable 20 can be freely changed depending on the position of the circuit board (not shown) to which the terminal portions 18 and 18 'are connected.

The overheat detecting element with the flat cable can also be used as a normal fuse. In this case, the overheat detection pattern 11 may be made of a material that generates heat when an overcurrent flows and is melted and cut at the temperature.

Further, this overheat detecting element with a flat cable does not necessarily have to be used only in the case of abnormal heating, in short, if the overheat detecting pattern 11 is melted and cut when overheated to a predetermined temperature, it is possible to detect the overheated state. It's good.

The insulating layer 17 was not screen-printed on the overheat detection pattern 11 for the following reason. That is, both the overheat detection pattern 11 and the insulating layer 17 are screen-printed, and even if the overheat detection pattern 11 is dried, if the insulating layer is printed thereon, it is included in the insulating layer 17. This is because the solvent may dissolve the dried overheat detection pattern 11 again and change the initial characteristics of the overheat detection pattern 11.

[Effect of device]

As described in detail above, the overheat detecting element with a flat cable according to the present invention has the following excellent effects.

(1) The material of the overheat detecting element with a flat cable is inexpensive, and its structure facilitates mounting on a device.

(2) Since the flexible overheat detecting element substrate and the flat cable are integrally formed, when connecting this flexible overheat detecting element substrate to another circuit board, a lead wire is soldered to this flexible overheat detecting element substrate. No need to connect. Further, since it is not necessary to solder the lead wire to the flexible overheat detecting element substrate, the flexible overheat detecting element substrate can be downsized, and the convex portion due to soldering or the like can be eliminated to reduce the thickness.

(3) Since the overheat detecting element with a flat cable according to the present invention has a structure in which an overheat detecting pattern, a wiring pattern and the like are formed on a film made of synthetic resin, the overheat detecting element with a flat cable is very thin. Not only can the overheat detecting element with a flat cable be made thinner, but it can also be easily bent, so even if the mounting position is a curved surface, it can be easily attached in close contact with the curved surface, and the overheated state of the attached member can be maintained. Can be detected immediately.

(4) When the adhesive layer is formed on the back surface of the flexible overheat detecting element substrate, the adhesive does not have to be used when the flexible overheat detecting element substrate is attached to the predetermined surface, so that the flexible overheat detecting No contamination of the element substrate surface, deterioration due to solvent, or failure.

(5) Since the wiring pattern, the overheat detection pattern, and the insulating layer are all configured to be printed on the film by screen printing, they can be manufactured only by the same screen printing equipment, and therefore the manufacturing is easy and the manufacturing cost is reduced. Can be realized.

(6) Since a plurality of wiring patterns to be connected to the overheat detection pattern are gathered on the film forming the flat cable and extended in parallel to the end of the film, and the tip of the film is used as the terminal part, only the one terminal part is formed. The attachment work can be easily completed simply by connecting to one connector or the like of another circuit board.

(7) Since the insulating layer is not screen-printed on the overheat detection pattern, the solvent contained in the insulating layer does not dissolve the dried overheat detection pattern again, and therefore the characteristics of the overheat detection pattern do not change. Absent.

[Brief description of drawings]

1 (a) and 1 (b) are views showing an embodiment of an overheat detection element 1 with a flat cable according to the present invention, and FIGS. 2 (a) and 2 (b) are overheat detection with a flat cable according to the present invention. FIG. 3 is a diagram showing another embodiment of the element 1, FIGS. 3 (a) to 3 (c) are views for explaining a method of manufacturing the overheat detecting element 1 with a flat cable, and FIG.
FIG. 5 is a view for explaining a method of attaching 25, 25, and FIG. 5 is a view showing a usage state of the overheat detecting element 1 with a flat cable. In the figure, 1 ... Overheat detecting element with flat cable, 10 ... Flexible overheat detecting element substrate, 11 ... Overheat detecting pattern,
15, 15 ... Wiring pattern, 18 ... Terminal part, 20 ... Flat cable, 21 ... Pressure-sensitive adhesive layer, 25, 25 ... Metal terminal piece, 27 ... Terminal fixing film, 100 ... Film.

Claims (3)

[Scope of utility model registration request] 1. Overheat detection made of a pasty material, which is formed by screen-printing at least two wiring patterns made of a pasty material on one synthetic resin film and is melted and cut when a predetermined temperature is applied. A flexible overheat detecting element substrate is formed by forming a pattern by screen printing so as to connect between the two wiring patterns, and the film itself forming the flexible overheat detecting element substrate is stretched and the flexible film is stretched on the stretched film. All wiring patterns are gathered and extended to extend in parallel to the end to form a flat cable, and the overheat detection pattern, the connection part of the overheat detection pattern to the wiring pattern, and the wiring drawn on the flat cable. On the wiring pattern excluding the end of the pattern, The layers were screen printed, the overheat detecting element with flat cable, characterized in that the uncoated portions in the insulating layer of the wiring pattern end portion is the terminal portion. 2. A metal terminal piece is connected to a wiring pattern which is not covered with an insulating layer at the end of the flat cable, a terminal fixing film made of synthetic resin is placed on the metal terminal piece, and the terminal fixing film and the flat are connected. The overheat detecting element with a flat cable according to claim 1, wherein the terminal of the cable is locally welded to the film of the cable. 3. An overheat detecting element with a flat cable according to claim 1, wherein an adhesive layer is formed on the back surface of the flexible overheat detecting element substrate.