JPH0915061A - Manufacture of planar temperature sensor - Google Patents

Abstract

PURPOSE: To enhance efficiency in the manufacture of a planar temperature sensor by laminating a polyester resin film previously onto one side of a conductive member, inserting a member impregnated with epoxy resin between the conductive members and then bonding them by thermocompression thereby simplifying the thermocompression process. CONSTITUTION: First and second conductive members 10, 11 are prepared by applying a polyester resin or phenol resin film having the same area and thickness t2=5-50μm to each one side of 10a, 11a of aluminum foils having thickness t1=5-20μm and then pasting the aluminum foils. A member 13 of glass fiber cloth impregnated sufficiently with epoxy resin having thickness t3=50-1000μm is then inserted between the conductive members 10, 11 of the films 20, 21 while extending over the periphery of the films by about 1cm. Subsequently, first and second lead wires 14, 15, i.e., normal coated wires, are inserted at different positions and set on a press, where they are thermocompressed at 120-160 deg.C and cooled naturally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention replaces conventional temperature sensing devices such as thermocouples, thermistors, and thermal fuses that sense the temperature in a region of a point or line and the local temperature of any part of the surface. The present invention relates to a method for manufacturing a planar temperature sensing device capable of sensing even changes, and more particularly to a method for laminating a planar temperature sensing device, a method for electrically connecting lead wires from a conductive member serving as an electrode, and a method for extracting the lead wires.

[0002]

[Prior Art] The Ministry of International Trade and Industry Ordinance "Technical Standards for Electrical Appliances"
In the case of electric heating boards used for floor heating, two or more if the area of the heat generating part is 0.8 m ² or less, and one or more in 0.4 m ² if the area exceeds 0.8 m ² (thermostat). , Thermal fuses, etc.) are to be installed.

However, since this safety standard defines the density of the temperature overheat prevention device which is a temperature sensing device for a point with respect to the planar heat generating portion, there is a narrow area where the temperature overheat prevention device is not arranged. When overheating occurs, the detection is delayed and the operation of the overheat prevention system, which should be activated early, is too late.

Therefore, in order to enhance safety, it was necessary to arrange many temperature sensing devices above the above standard.

However, even if the density of the temperature sensing device is increased, it cannot be said that sufficient safety is ensured as long as there is a gap that is not sensed.

Further, arranging a large number of the thermostats and the thermal fuses in the electric heating board causes an increase in cost, an increase in defective rate, and troublesome wiring, and therefore, the above-mentioned temperature overheat prevention device has a certain volume. Therefore, there are various problems that the thickness of the electric heating board is increased.

On the other hand, a temperature detecting device having a planar sensing area, which has improved the above drawbacks, has been clarified by the applicant of the present invention in the inventions of Japanese Patent Application Nos. 5-315114 and 6-308854. (The applicant of the present application is the inventor of the above invention).

This temperature detecting device can detect the temperature of the entire surface of a planar object and can effectively detect a local temperature change of an arbitrary small area within the surface, and is extremely simple. It has a thin plate structure and is highly durable and versatile as a sensor for preventing overheating of electrical equipment.

[0009]

Epoxy resin is used as the temperature sensing substance of the above temperature detecting device, but the epoxy resin is more expensive than other general-purpose synthetic resins, and this is used as an electrode for the surface condition. A manufacturing method in which the conductive member is coated on the outside as an insulating protective film causes an increase in cost, and it is difficult to say that it is an optimum insulating protective film.

Further, when the lead wire is led to the outside from a thin conductive member of about several microns, since the epoxy resin as an intervening member sandwiched between the conductive members is extremely thin, the lead wire and the conductive member are bonded together. There is a possibility that the electrically connected portion of (3) penetrates the intervening member (epoxy resin layer) and short-circuits with the other conductive member, which is difficult to manufacture.

In this regard, the invention of the temperature detecting device does not clearly show the specific problems in the manufacturing.

The present invention has been made in view of the above circumstances, and is a method for manufacturing a planar temperature sensing device, particularly a method for laminating a conductive member and an interposition member impregnated with an epoxy resin which is a temperature sensing substance, and an electrode. The present invention provides an electrical connection of a lead wire from a conductive member and a method of extracting the lead wire.

[0013]

SUMMARY OF THE INVENTION The present invention provides (1) an epoxy resin having a substantially equal area between a planar first conductive member and a second conductive member whose electric resistivity changes depending on temperature. A sheet-shaped interposing member impregnated with
A method for manufacturing a planar temperature sensing device having a structure in which a conductive member is used as a detection electrode, and first and second lead wires electrically connected to each conductive member are led out from the first and second conductive members. In the above, two aluminum foils or copper foils having a thickness of 5 to 20 μm are used as the first and second conductive members, and a polyester resin film or a phenol resin film having a thickness of 5 to 50 μm is laminated (lamination molding) on each one surface thereof. The two intervening members are preliminarily prepared, and an intervening member obtained by impregnating a sheet of glass fiber having a thickness of 50 to 1000 μm with a thermosetting epoxy resin is formed between the first conductive member and the second conductive member of the two films. According to a method for manufacturing a planar temperature sensing device, which is sandwiched between them and thermocompression bonded at 120 to 160 ° C., the manufacturing method according to (2) or (1) above,
In the state where the first and second conductive members are laminated, notch portions are provided at different positions on the peripheral edge portion that do not face each other, and the connecting end portion of the first lead wire is on the first conductive member and the notch portion of the second conductive member. The second conductive member is placed in electrical contact with the first conductive member in the region corresponding to the second portion, and the connection end portion of the second lead wire is located on the second conductive member in the region corresponding to the cutout portion of the first conductive member.
By placing the intervening member in electrical contact with the conductive member, thermocompression bonding of the intervening member and the first and second conductive members can be performed simultaneously with the electrical connection between the first and second conductive members of the first and second lead wires. (3) According to the method for manufacturing a planar temperature sensing device characterized in that the mechanical connection and the fixing of the take-out port are performed. 2 Lead wire is made of aluminum foil, aluminum plate, copper foil, or copper plate to the exposed peripheral edge of the intervening member in electrical contact with the end of the first or second conductive member, and is electrically connected at the same time as thermocompression bonding. According to a method for manufacturing a planar temperature sensing device, characterized in that a connection and a takeout port are fixed to an intervening member, (4) The planar temperature according to (1), (2) or (3) above. In the method for manufacturing the sensing device, the first edge of the interposing member is provided. And a surface of the second lead wire on which a glass epoxy resin sheet piece is placed and pressure-bonded at the same time as the thermocompression bonding to reinforce the outlet parts of the first and second lead wires. The above-mentioned problems are solved by a method of manufacturing an ambient temperature sensing device.

[0014]

According to the method for manufacturing a planar temperature sensing device of the present invention, (1) an aluminum foil or an aluminum plate, or a copper foil or a copper plate is used as a conductive member, and a polyester resin or phenol is used as an insulating protective film only on one surface of the aluminum foil or aluminum plate. Since a resin laminate is made in advance and used, it is possible to reduce costs by using cheaper polyester resin or phenol resin than using expensive epoxy resin as the protective film on the outermost part of the planar temperature sensing device. .

Further, since the protective film is first laminated on the conductive member (for example, aluminum foil) (which means lamination molding, the film is pasted or the print is pasted), the thermocompression bonding process is simple at a time. You can do it.

Further, the polyester resin and the phenol resin (film) have good adhesiveness to the aluminum foil,
Once thermocompression-bonded, it exhibits excellent heat resistance and insulating properties as a protective film.

(2) Aluminum foil for the first and second conductive members,
Notches (for example, quadrangular shapes) are provided at different positions of the peripheral edge portions that do not face each other in a state in which any one of the aluminum plate, the copper foil, and the copper plate is overlapped, and at the time of the thermocompression bonding process, the first
The connection end of the lead wire (for example, an electric wire) is placed on the first conductive member in a region corresponding to the cutout portion of the second conductive member in electrical contact with the first conductive member to connect the second lead wire. By placing the end portion on the second conductive member in a region corresponding to the cutout portion of the first conductive member in electrical contact with the second conductive member, even if the lead wire penetrates the intervening member by thermocompression bonding. There is no contact with the mating conductive member and there is no risk of short circuit.

At the same time as thermocompression bonding of the intervening member and the first and second conductive members, the electric connection of the first and second lead wires to the first and second conductive members is firmly fixed. The lead wire is adhered and fixed to the intervening member of the takeout port leading to the outside.

(3) The first method for taking out the terminal portion is
And the second lead wire as an aluminum foil, an aluminum plate, a copper foil, or a copper plate to the exposed peripheral edge of the interposing member.
Since it is a method of drawing out in electrical contact with the end of the conductive member and performing thermocompression bonding and electrical connection and fixing of the outlet to the intervening member at the same time, if the terminal extraction portion from the planar temperature sensing device body is thick You don't have to.

Therefore, the planar temperature sensing device main body and the terminal lead-out port can be sandwiched even in a thin object such as an electric heating panel.

(4) The lead wire and the intervening member are most easily detached from each other by the external force at the take-out portions of the first and second lead wires at the edge of the interposing member in the body of the sheet-like temperature sensing device having a very thin thickness of 1 mm or less. In the case of a lead wire, a piece of glass epoxy resin sheet is placed on the wire and the lead wire for reinforcing the lead-out ports of the first and second lead wires with epoxy resin by pressing the same at the same time as the thermocompression bonding. Reliability is improved by adopting a fixing method.

Here, the epoxy resin is used in a three-dimensionally crosslinked and cured form in which an epoxy ring and a curing agent are reacted, and various characteristics are exhibited by the combination of the epoxy resin and the curing agent. In the present invention, a temperature range that exhibits electrical insulation as a temperature sensing substance, and the physical quantity changes exponentially with respect to temperature change, but is proportional to the area change of the intervening member interposed between the conductive members. Any temperature may be used as long as it has a temperature range that changes dynamically.

The polyester resin is a general term for polymers having an ester bond in the main chain, and in the present invention, unsaturated polyester, alkyd resin, PET (polyethylene terephthalate), PBT (polybutylene terephthalate).
And the like, and the phenol resin is a thermosetting resin synthesized from phenol and formaldehyde.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical sectional view for explaining a laminated structure of a planar temperature sensing device according to the present invention. Shows the lamination relationship of each film and sheet before thermocompression bonding, (B)
Shows the cross-sectional structure after thermocompression bonding.

In FIG. 1, the planar temperature sensing device 50 is
The first conductive member 10 and the second conductive member 1 that are substantially equal in area and are planar
A sheet-like intervening member 13 impregnated with an epoxy resin whose electric resistivity changes depending on temperature is sandwiched between the first and the second conductive members 10 and 11 to serve as detection electrodes. At the same time, first and second lead wires 14 and 15 electrically connected to the respective conductive members from the first and second conductive members.
Of the above-mentioned first and second
Two aluminum foils or copper foils having a thickness t1 = 5 to 20 μm are used as the conductive members 10 and 11, and one side 10a, 1
Two films 20 and 21 in which a polyester resin film or a phenol resin film 16 or 17 having a thickness t2 = 5 to 50 μm is laminated (laminated) on 1a are prepared in advance, and then a glass fiber having a thickness t3 = 50 to 1000 μm. The intervening member 13 in which the thermosetting epoxy resin is impregnated in the sheet of No. 2 is sandwiched between the first conductive member 10 and the second conductive member 11 of the two films 20 and 21 and heated at 120 to 160 ° C. This is a manufacturing method characterized by crimping and bonding (corresponding to claim 1).

At this time, the connecting end portion 1 of the first lead wire 14
4a is electrically connected and fixed to the first conductive member 10 by thermocompression bonding, and similarly, the connection end portion 15a of the second lead wire 15 is the second
The conductive member 11 and the electrical connection are fixed by thermocompression.

During this thermocompression bonding, as shown in FIG. 1B, the thermosetting epoxy resin melts and swells around the edges 23 and 24 of the films 20 and 21 to form an insulating protective film. Polyester resin film or phenol resin film 16, 1
The first and second conductive members 10 and 11 are completely sealed by fusion bonding with 7.

According to an experiment conducted by the inventor of the present application, the first and second
As a conductive member, an aluminum foil having a thickness of t1 = 7 μm, a polyester resin or a phenol resin having the same area has a thickness of t2 =
Film 2 made by stacking 12 μm films on top of each other
0, 21 was cut into an area of about 30 cm square (1000 cm ² ), and the area around the film was about 1 mm.
The thickness t3 = 200, which is large enough to be exposed with a cm width.
An intervening member 13 (a resin structure in an uncured state, which is a so-called prepreg) in which a glass fiber cloth of μm is sufficiently impregnated with an epoxy resin is used as the conductive member 1 of the films 20 and 21.
The first and second lead wires 14 and 1 while being sandwiched between 0 and 11
As shown in Fig. 5, the connection end of the ordinary covered electric wire is inserted and placed in a different place, and is set in the press machine to set about 4 Kg / cm ²
After press bonding for about 1 hour at 140 ° C and natural cooling, a surface temperature sensing device that can be applied to electrical products such as floor heating with sufficient durability, insulation and heat resistance can be manufactured. It was

In the present invention, since the conductive member and the polyester film or the phenol film as the insulating protective film are adhered in advance as described above, it is easy to superimpose them at the time of thermocompression bonding. To improve.

Next, FIG. 2 is a perspective view for explaining a stacking method relating to the electrically connecting portions of the first and second conductive members with the lead wires according to claim 2 of the present invention, and FIG. It is a top view.

2 and 3, in the planar temperature sensing device 60, the first and second conductive members 10 and 11 are stacked, and the cutouts 10b are formed at different positions on the peripheral edges which do not face each other.
11b is provided (the polyester film or the phenolic films 16 and 17 are notched at the same position in the figure), and the connecting end portion 14a of the first lead wire 14 is first
The second lead wire 1 is placed on the conductive member 10 (positioned on the lower side in FIG. 2) in a region corresponding to the cutout portion 11b of the second conductive member 11 in electrical contact with the first conductive member 10.
The connection end portion 15a of the first electrode 5 is on the second conductive member 11
By placing the conductive member 10 in the region corresponding to the notch 10b in electrical contact with the second conductive member 11, the interposition member 13 and the first and second conductive members 10 and 11 can be bonded at the same time by thermocompression bonding. First of each of the first and second lead wires 14 and 15
And electrical connection with the second conductive member and outlets 27, 2
8 fixed.

As described above, the first and second conductive members 10,
By providing the cutout portions 10b and 11b in the connection portion 11, the lead wire connecting ends 14a and 15 are formed by the thermocompression bonding process.
Even if "a" is pressed into the intervening member 13 and penetrates through the intervening member 13 at worst, it does not come into contact with each other because the mating conductive member at that location is cut out, and there is no risk of short-circuiting.

Next, FIGS. 4A and 4B are (A) a longitudinal sectional view and (B) a plan view for explaining a stacking method for an electrically connecting portion of a lead wire according to claim 3 of the present invention. In the method of manufacturing the temperature sensing device 60, the first and second lead wires are not ordinary covered electric wires, but any one of aluminum foil, aluminum plate, copper foil, and copper plate (for example, strip-shaped aluminum foil 3).
4, 35) is led out to the exposed peripheral edge of the intervening member 13 in electrical contact with the end of the first or second conductive member 10, 11 and at the same time as thermocompression bonding, electrical connection and extraction to the intervening member of the take-out port are performed. It is characterized in that it is manufactured so as to be fixed.

Here, the aluminum foil and the copper foil are small pieces having the same thickness as or slightly thicker than the aluminum film as the conductive member (5 to 200 μm), and the aluminum plate and the copper plate are used in a usual semiconductor device. A plate piece or pin having a thickness (0.2 to 1.5 mm) of a connecting terminal.

In each case, the epoxy resin melted by thermocompression is cured and bonded and fixed on the interposition member 13.

As can be seen from the plan view of FIG. 4B, the notch 1 is formed in the first and second conductive members 10 and 11 also in the above case.
It is important that 0b and 11b are provided so that a short circuit does not occur as a lead wire.

Next, FIG. 5 is a vertical sectional view in the case of a lead terminal of an aluminum plate (B) for explaining a stacking method relating to a lead wire outlet portion according to claim 4 of the present invention. It is a figure.

In FIGS. 5A and 5B, external force is generally applied to the bonding portion between the lead wire (or lead terminal) and the interposing member, which is a lead-out port wired from the main body of the sheet temperature sensing device to the external control device. Peeling of the polyester film or peeling of the lead wire from the intervening member is likely to occur.

Therefore, the glass epoxy resin sheet piece 38 is placed as a reinforcing material in the thermocompression bonding step of the present manufacturing process at the take-out port portion where the lead wire (14, 15, 34, 35) is bonded to the interposition member 13. Then, at the same time as the thermocompression bonding, pressure bonding is performed to reinforce the outlet portions of the first and second lead wires with an epoxy resin.

The glass epoxy resin sheet piece 38 is used.
Is obtained by impregnating the same material as the interposition member 13 of about several cm ² with epoxy resin.

As described above, the method for manufacturing the planar temperature sensing device according to the present invention has a structure in which the conductive members are opposed to each other by thermocompression bonding with a very thin intervening member of about 50 to 1000 μm interposed therebetween. It is intended to clarify a lead wire extraction method, a connection method, and an insulating protective film forming method, which are problems at the time of conversion.

[0042]

The method for manufacturing a planar temperature detecting device of the present invention has the following effects.

(1) Since a polyester resin film having good adhesiveness is laminated as an insulating protective film on one surface of a conductive member in advance, an intervening member impregnated with an epoxy resin as a temperature sensing substance is sandwiched and thermocompression bonded. The thermocompression bonding process is simplified and the efficiency is improved.

(2) By providing notches in the first and second conductive members, even if the connecting end of the lead wire penetrates through the intervening member in the thermocompression bonding process, the mating conductive member at that location is notched. Since there is no contact, there is no risk of short circuit.

(3) Since the aluminum foil, aluminum plate, copper foil, and copper plate are used as lead wires to be electrically connected and fixed to the conductive member during the thermocompression bonding process, and adhered and fixed to the intervening member, the terminal of the external outlet can be very easily formed. Can be formed.

(4) A glass epoxy resin sheet piece is placed as a reinforcing material during the thermocompression bonding process on the take-out port portion which is bonded to the interposing member of the lead wire, and the crimping process is carried out at the same time as the thermocompression bonding so that the take-out port region is Since it is reinforced with the epoxy resin, peeling from the insulating protective film of the lead wire or the intervening member does not occur and reliability is improved.

[Brief description of the drawings]

FIG. 1A is a schematic vertical sectional view for explaining a laminated structure of a planar temperature sensing device according to claim 1 of the present invention, FIG.
Indicates the lamination relationship of each film and sheet before thermocompression bonding,
(B) shows a cross-sectional structure after thermocompression bonding.

FIG. 2 is a perspective view for explaining a stacking method relating to a portion where the first and second conductive members of the present invention are electrically connected to a lead wire.

FIG. 3 is a plan view of the planar temperature sensing device having the above structure.

FIG. 4A is a view for explaining a stacking method relating to an electrical connection portion of a lead wire according to claim 3 of the invention.
It is a longitudinal sectional view and a (B) top view.

FIG. 5A is a view for explaining a stacking method for the lead wire outlet portion according to claim 4 of the present invention.
It is a longitudinal cross-sectional view in the case of a lead terminal of an aluminum plate, (B) plan view.

[Explanation of symbols]

10 1st electroconductive member 11 2nd electroconductive member 10b, 11b Notch part 13 Interposition member 14 1st lead wire 15 2nd lead wire 14a, 15a Connection end part 16, 17 Polyester resin film or phenol resin film 20, 21 Film 27, 28 Ejection port 34, 35 Strip-shaped aluminum foil 38 Glass epoxy resin sheet piece 50, 60 Surface temperature sensing device

Claims (4)

[Claims] 1. A first conductive member and a second conductive member which are substantially equal in area and are planar.
A sheet-like interposition member impregnated with an epoxy resin whose electric resistivity changes depending on temperature is sandwiched between the conductive member and the first and second conductive members as detection electrodes, and A method for manufacturing a planar temperature sensing device, wherein first and second lead wires electrically connected to the first and second conductive members are led out to the outside, wherein the first and second conductive members are provided. As two aluminum foils or copper foils with a thickness of 5 to 20 μm are used, 5 to 50
Two films made by laminating a polyester resin film or a phenolic resin film with a thickness of μm are prepared in advance,
Next, an intervening member obtained by impregnating a sheet of glass fiber having a larger area than the first and second conductive members and having a thickness of 50 to 1000 μm with a thermosetting epoxy resin is used as the first conductive member of the two films. 120 sandwiched between the second conductive member
A method for manufacturing a planar temperature sensing device, which comprises thermocompression bonding at 160 ° C. 2. The method for manufacturing a planar temperature sensing device according to claim 1, wherein the first and second conductive members are stacked, and notch portions are provided at different positions of the peripheral portions that do not face each other, and the first lead is provided. The connecting end of the wire is placed in electrical contact with the first conductive member on the first conductive member in a region corresponding to the cutout of the second conductive member, and the connecting end of the second lead wire is placed in the second conductive member. A second portion is provided on the conductive member and in a region corresponding to the cutout portion of the first conductive member.
By placing the intervening member in electrical contact with the conductive member, thermocompression bonding of the intervening member and the first and second conductive members can be performed simultaneously with the electrical connection between the first and second conductive members of the first and second lead wires. A method for manufacturing a planar temperature sensing device, characterized in that the physical connection and the fixing of the outlet are performed. 3. The method for manufacturing a planar temperature sensing device according to claim 2, wherein the first and second lead wires are made of aluminum foil, an aluminum plate, a copper foil, or a copper plate and are provided to the exposed peripheral edge of the interposing member. A method for manufacturing a planar temperature sensing device, characterized in that it is led out in an electrical contact state with the end of the first or second conductive member, and is subjected to thermocompression bonding, and at the same time, electrical connection and fixing of the outlet to the intervening member are performed. . 4. The method according to claim 1, 2 or 3.
In the method for manufacturing a planar temperature sensing device described above, a glass epoxy resin sheet piece is placed on the take-out portions of the first and second lead wires at the edge of the interposing member, and the first and second thermocompression bonding are performed to perform pressure bonding at the same time. A method for manufacturing a planar temperature sensing device, comprising reinforcing the outlet portions of the first and second lead wires.