JPS5849812B2 - Manufacturing method of temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a temperature sensor that detects the temperature of a rotating body that rotates at a relatively low speed, such as a fixing heat roller inside a copying machine.

A conventional temperature sensor of this type had a configuration as shown in FIGS. 1 and 2.

That is, a temperature-sensitive element 2 such as a thermistor is placed on a heat-sensitive plate 1 made of metal, and a protector 3 made of silicone rubber or the like is placed on top of it.
is formed.

The conducting wire 2a of the temperature sensing element 2 is covered with an insulating tube 2b and led out.

The heat-sensitive plate 1 of such a temperature sensor is pressed onto a rotating body (not shown) by utilizing its elasticity to detect the temperature on the surface of the rotating body.

However, since the heat-sensitive plate 1 is made of metal, the heat transfer is inaccurate and there is a temperature difference with the rotating body, making it impossible to accurately detect the temperature. Could not detect temperature.

In addition, a conductor 2a from the temperature sensing element 2 adhesively fixed to the heat sensing plate 1
Since it is relatively thick like a Dumet wire, the elastic force of both the heat-sensitive plate 1 and the conducting wire 2a acts, and the elastic force varies depending on the method of fixing the conducting wire.

As a result, errors may occur in the detected temperature depending on the method of fixing the conducting wire.

Furthermore, if the elastic force is made too strong, the rotating body may be scratched because the heat-sensitive plate 1 is made of metal.

For this reason, a temperature sensor as shown in FIG. 3 was devised.

That is, the temperature sensing element 2 is placed on one surface of an elastic body 4 such as silicone rubber, and a thin film tape 5 is adhered and fixed.

This temperature sensor has a sensing surface that fits well to the shape of the object to be detected, so there is little heat radiation from the surroundings, and the thermal time constant is relatively small.

However, since the conducting wire 2a passes through the inside of the elastic body 4 and the elastic body 4 expands and contracts, the conducting wire 2a must be flexible and must also be a thin wire from the viewpoint of reducing heat radiation.

For this reason, platinum wire has usually been used as the conducting wire 2a.

Therefore, assembly of this temperature sensor is complicated and difficult, and it is expensive and difficult to mass-produce.

Furthermore, there is a risk that wire breakage may occur during use, making temperature control impossible.

Furthermore, in the past, temperature sensors were manufactured for one piece, making it difficult to improve work efficiency, and the manufactured products were also inspected for one piece, making inspections troublesome and reducing efficiency. It was bad.

Therefore, the present invention provides a method for manufacturing a temperature sensor that has good adhesion to the object to be detected, has a small thermal time constant, can accurately detect temperature, and is less likely to break the wire or damage the object to be detected. The purpose is to

Another object of the present invention is to provide a method for manufacturing a temperature sensor that can manufacture a large number of temperature sensors from one sheet and simultaneously test the quality of a large number of temperature sensors.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 15.

In these figures, corresponding parts are indicated by the same reference numerals.

As shown in FIGS. 4 and 5, an insulating thin film sheet 10 made of resin such as vinyl chloride, polyester, polyethylene, polyimide, or fluororesin (with a thickness of approximately 25 μm to 200 μm)
A conductor foil 11 (about 35 μm in thickness) is formed on the conductor foil 11 (about 35 μm in thickness) by etching, adhesion, etc.

Furthermore, an insulating thin film sheet 9 (thickness approximately 25 μm to 200 μm) made of the same material as the insulating thin film sheet 10 is formed thereon by adhesion, heat fusion, or the like.

This state is similar to that of a so-called flexible printed circuit board.

A hole is opened at a predetermined location on the sheet 9 by a mechanical or chemical method, and a part of the sheet 10 and a part of the conductive foil 11 as the connection part 8 are exposed.

The heat-sensitive element 6 is inserted through this opening and placed on the sheet 10.

Then, the conducting wire 7 of the heat-sensitive element 6 is connected to the connecting portion 8 by soldering, welding, or the like.

Thereafter, the opening is covered with an adhesive such as silicone rubber, epoxy resin, or adhesive tape to form the protector 12.

Further, the end portion of the conductor foil 11 is exposed as a sensor fixing portion or an output conductor lead-out portion 17.

The temperature sensor 13 is formed by the above steps.

FIG. 6 shows its usage.

That is, the temperature sensor 13 having the temperature sensing element 6 has an output conductor 15 connected to its output conductor pull-out part 17 and the tag holding part 1 .
It is held by 4.

The temperature sensor 13 is pressed against a rotating body 16 as an object to be detected by the elastic force of the conductive foil 11 and the sheets 9 and 10.

FIG. 7 shows another state of use.

In this case, in addition to the elastic force of the temperature sensor 13, the rotating body is
A temperature sensor 13 is pressed into contact with 6.

FIG. 8 shows an embodiment in which the temperature sensor 13 is mass-produced.

That is, each temperature sensor 13 is provided between seats 9 and 10.
The conductor foil 11b is commonly connected to the conductor foil 11 of each temperature sensor 13, and the conductor foil 1 is connected to the conductor foil 11 of each temperature sensor 13.
1a is formed, the ends of which are each exposed as measuring ends 20.19.

Further, a sensor fixing part (output conductor connection part) 17 having a fixing hole 22 and a temperature sensing element fixing part 21 are exposed.

The thermosensing element fixing part 21 is covered with a protector 12 after the conductor 7 of the thermosensing element 6 is connected to the connecting part 8 thereof.

A predetermined measuring device (not shown) is connected between the common measurement terminal 20 and the measurement terminal 19 of each temperature sensor 13, and the electrical continuity of each temperature sensor 13 is inspected and confirmed.

After that, sheet 9 (10) is cut along arrow C,
A large number of temperature sensors 13 are obtained.

FIGS. 9 and 10 show a second embodiment.

In this example, the temperature sensing element 6 is fixed substantially perpendicularly to the conductive foil 11.

Therefore, the temperature sensor 13 can be held by the holding part 14 as shown in FIG. 11, and can be pressed against the rotating body 16 as shown in FIG. 12.

In this example, it is possible to press the temperature sensor 13 to the rotating body 16 almost only by the elastic force of the conductive foil 11 and the sheets 9 and 10.

FIG. 13 shows an embodiment in which such a temperature sensor 13 is mass-produced.

This is the same as the case shown in FIG. 8 except that the conductor foil 11 is formed substantially perpendicular to the mounting direction of the temperature sensing element 6.

FIG. 14 shows a third embodiment.

The temperature sensing element 6 is fixed substantially perpendicularly to the conductor foil 11, which is the same as the embodiment shown in FIG.
c is formed.

This conductor foil 11c is insulated from the conductor foil 11, and is for strengthening elastic force.

Therefore, this temperature sensor 13 has two
It is possible to hold it in the bent state by the holding part 14 and press it against the rotating body 16 more strongly.

In the above embodiment, the conventional example shown in FIG. 1 is about 1/10 of the conventional example shown in FIG.
2 for each thermal time constant.

As described above, in the present invention, a large number of temperature sensors can be manufactured at once on a large sheet, so the structure is simple, and by arranging the conductive foils in close proximity, measurement and classification can be easily performed at one time. It is possible to improve mass production, and since the manufactured temperature sensor uses a thin insulating sheet, it has good adhesion to the object to be detected.
It emits less heat and can accurately detect temperature.Furthermore, by burying the conductive foil within the sheet, the conductive foil moves in the same direction as the sheet, creating a uniform force effect and improving adhesion. There is little risk of oxidation or wire breakage.

Furthermore, since the width and thickness of the conductive foil can be reduced, the thermal time constant can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 show conventional temperature sensors;
Figures 1 through 15 each represent a temperature sensor of the present invention. FIG. 1 is a plan view, FIG. 2 is a sectional view thereof, and FIG. 3 is a plan view of another embodiment. Figure 4 is a plan view, Figure 5 is a sectional view, Figures 6 and 7.
The figure is a usage state diagram, and FIG. 8 is an explanatory diagram in the case of mass production. Fig. 9 is a perspective view showing another embodiment, Fig. 10 is a sectional view thereof, Fig. 11 is a view showing the holding state, Fig. 12 is a diagram of its usage state, and Fig. 13 is an explanation of its mass production. It is a diagram. FIG. 14 is a plan view of another embodiment, and FIG. 15 is a diagram showing its use. 1... Heat-sensitive plate, 2, 6... Temperature-sensitive element,
3, 12... Protector, 4, 7... Conductor wire, 9, 10... Insulating thin film sheet, 1 1 t
1 1 a t 1 1 b t 1 1 c”・”・
Conductor foil, 13...Temperature sensor, 14...
...Holding part, 15...Output conductor, 16...
··Rotating body.

Claims (1)

[Claims] 1. Form a plurality of rows of conductive foils with the same predetermined pattern on a first insulating thin film sheet, connect one side of each pattern with a common conductive foil, and form a second insulating thin film sheet thereon to create a sandwich structure. Then, a part of the second insulating thin film sheet and a part of the conductive foil are exposed, a temperature sensing element is inserted into the opening, and the conductive wire is connected to the exposed conductive foil.
A method for manufacturing a temperature sensor, in which a plurality of temperature sensors are obtained from one sheet by covering the openings with a protector, inspecting the quality of the temperature sensing element, and then cutting a predetermined pattern.