JPH11142257A - Temperature sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-performance temperature sensor which can detect the surface temperature of an object of temperature measurement such as a fixing roller stably, accurately, and speedily without causing deterioration in picture quality, the peeling performance of the fixing roller, etc., due to the frictional abrasion between a temperature detecting element and the fixing roller in spite of long-period use. SOLUTION: This is a temperature detecting device which detects the surface temperature of the object of temperature measurement and characterized by that the external surface of a contact part for the object of temperature measurement is coated with a fluorine-based porous member. Namely, this temperature detecting device 1 is constituted by coating the contact part for the fixing roller 5 as the object of temperature measurement with the fluorine-based porous member 8, the temperature detecting element 1 is arranged inside the device and a metallic thin plate 4 is arranged further inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting device for detecting a surface temperature of a fixing roller in a roller type heat fixing device of an electrophotographic copying machine or the like.

[0002]

2. Description of the Related Art In a copying machine, for example, a toner transferred onto copy paper is fixed using a fixing roller having a heater inside. During the fixing, the copy paper is heated while being pressed against the fixing roller, so that the toner transferred onto the copy paper is fused to the copy paper, and the toner image is fixed on the copy paper. . Since the surface temperature of the fixing roller has to be maintained at a constant high temperature, the surface temperature is usually always detected by a temperature detecting device, and the inside of the fixing roller is fixed in accordance with the detected temperature. The operation of the heater is controlled.

[0005] In the conventional temperature detecting device, for example, as shown in FIG. 5, a temperature detecting element 1 such as a thermistor and an elastic material 2 are covered with a heat-resistant tape (adhesive polyimide tape or Teflon tape) 3. This temperature detecting device 7
The temperature detecting element 1 contacts the fixing roller 5 via the heat-resistant tape 3 while receiving the pressing force of the thin metal plate 4, and detects the surface temperature of the fixing roller 5 in this state. But,
In the case of this temperature detecting device, no problem occurs initially, but if the temperature detecting device is used for a long period of time, the friction between the heat-resistant tape 3 and the fixing roller 5 causes the two to be worn, and the release layer of the fixing roller 5 Wear out. As a result, the releasability has been reduced and the fixed image has a streak-like image quality defect.

Conventionally, in order to avoid the above-mentioned problems, in a black-and-white copying machine, metal particles are added to a release layer of a fixing roller to improve the mechanical strength of the release layer itself. . On the other hand, in recent full-color copying machines,
In order to obtain a high-quality image, a method for improving the mechanical strength of the release layer of the fixing roller as in the above-described black and white copying machine cannot be performed. However, when a relatively large amount of release agent is used, (8 × 10 ^{-3 to} 1.3 × 10 ^-1 μl / cm ² ),
The frictional force between the temperature detecting device and the fixing roller can be reduced. As a result, there is no problem of wear between the two in long-term use. However, in recent years, the release agent tends to be used only in a very small amount or not used at all due to the problem of the image quality of OHP, environmental problems, and the like. For this reason, especially in a fixing roller in a full-color copying machine, an image defect caused by a decrease in releasability in long-term use is a very serious problem.

Therefore, in Japanese Patent Application Laid-Open No. 4-134389, "rollers" as rotating members are installed at both ends of a temperature detecting element, and the rollers are brought into contact with and driven by the surface of a fixing roller.
It has been proposed to dispose the temperature detecting element close to the fixing roller to solve the above-mentioned problem caused by wear. However, in this case, the temperature detection device becomes complicated and large, there are problems in maintenance and installation, and the temperature detection element is merely installed close to the fixing roller. There is also a problem that the true temperature cannot be detected.

On the other hand, Japanese Patent Application Laid-Open No. 5-150686 proposes that the above-mentioned problem caused by wear is solved by using only a thermistor, which is a temperature detecting element, and bringing it into contact with a fixing roller. ing. But,
In this case, only the contact area or contact force with the fixing roller is reduced, and the above-described problem caused by wear cannot be essentially solved.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and achieve the following objects. In other words, the present invention, even in long-term use,
The surface temperature of the object to be measured, such as the fixing roller, can be stably and accurately determined without causing deterioration in image quality and deterioration in the releasability of the fixing roller due to frictional wear between the temperature detecting element and the fixing roller. Further, it is an object of the present invention to provide a high-performance temperature detecting device capable of detecting the temperature quickly.

[0008]

Means for solving the above problems are as follows. <1> A temperature detecting device for detecting a surface temperature of an object to be measured, wherein an outer surface of a contact portion with the object to be measured is covered with a fluorine-based porous member. It is a temperature detecting device. <2> The temperature detecting device according to <1>, wherein the fluorine-based porous member is a heat-resistant film formed by a stretch molding method. <3> The fluorine-based porous member is made of at least one selected from polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer. The temperature detecting device according to <1>, which is a heat-resistant film formed by sintering. <4> The contact portion according to any one of <1> to <3>, wherein the contact portion has an elastic material impregnated with oil permeable to the fluorine-based porous member.
> The temperature detecting device according to any one of the above. <5> The amount of oil permeating from the fluorine-based porous member to the object to be measured is 1.7 × 10 ^{−5 to} 3.5 × 10 ^−3.
The temperature detector according to <4>, wherein the temperature is μl / cm ² · sec. <6> The oil according to the above <4, wherein the oil is a silicone oil, and the viscosity of the oil is 10 ² to 10 ⁵ centistokes.
> Or <5>. <7> The temperature detecting device according to any one of <4> to <6>, wherein the oil is gelled. <8> The thickness of the fluorine-based porous member is at most 150
The temperature detecting device according to any one of <1> to <7>, which is μm.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The temperature detecting device of the present invention has at least a contact portion that comes into contact with an object to be measured, and has other members appropriately selected as necessary. The contact portion has a temperature detecting element and, if necessary, an elastic material, and its outer surface is covered with a fluorine-based porous member.

The shape, structure, size, etc. of the contact portion are not particularly limited, and can be appropriately determined according to the shape, structure, size, etc. of the object to be measured. -Temperature detecting element- The temperature detecting element is not particularly limited and can be appropriately selected from known elements such as a thermistor and a thermocouple.

-Elastic material- The shape, structure, size and the like of the elastic material are not particularly limited, and can be appropriately determined according to the shape, structure, size and the like of the temperature detecting element. The material of the elastic material only needs to have heat resistance, and examples thereof include silicone rubber, silicone resin, and nylon (aramid). These may be used alone or in combination of two or more. Among these, silicone rubber and silicone resin are preferred in terms of production and cost. Examples of the form of the elastic material include a sponge shape, a woven fabric shape, and a nonwoven fabric shape, and among these, the sponge shape is preferable in terms of manufacturability, handling properties, cleaning properties, oil permeability, and the like.

[0012] The elastic material may be impregnated with oil. This is advantageous in terms of long-term reliability.
The type of the oil is not particularly limited as long as it has a property of reducing the friction coefficient, and examples thereof include a silicone oil and a fluorine oil. Examples of the silicone oil include dimethyl silicone oil, modified silicone oil, and fluorinated silicone oil. Examples of the modified silicone oil include an amino-modified silicone oil and a mercapto-modified silicone oil.

The viscosity of the oil is 10 ² to 10
⁵ centistokes is preferred, 10 ³ to 2 × 10 ⁴ centistokes is more preferred, and 5 × 10 ³ to 10 ⁴ centistokes is particularly preferred. The viscosity is less than 10 ² centistokes, most oil permeation, a short time tends to wear over time enemy since the oil is consumed, it exceeds ¹⁰⁵ centistokes, the oil is difficult to transmit On the contrary, there is a problem that it is easily worn from an early stage. In the present invention, the oil is preferably gelled. In this case, it is advantageous in that it is easy to control the permeation amount of the oil.

-Fluorine-based porous member-The material of the fluorine-based porous member is not particularly limited as long as it is a material having excellent heat resistance and durability. Examples thereof include polytetrafluoroethylene and polychlorotrifluoro. Ethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, tetrafluoroethylene-
Hexafluoropropylene-perfluoroalkyl vinyl ether copolymer and the like can be mentioned.

These may be used alone, or
Two or more kinds may be used in combination. Among these, the manufacturing aspect,
From the viewpoint of cost, at least one selected from polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer is preferable.

The form of the fluorine-based porous member is as follows:
Although there is no particular limitation, for example, a film shape, a sheet shape and the like are preferable. The thickness of the fluorine-based porous member is at most 150 μm, preferably 8 to 150 μm. If the thickness exceeds 150 μm, the thermal responsiveness is poor.

As a method for producing the film-like fluorine-based porous member, a method in which a resin film (having no holes) obtained from the above-mentioned material is made porous by a stretch molding method, and resin particles made from the above-mentioned material are sintered. And sintering it into a film. In the case of the stretch molding method, it may be uniaxial stretching or biaxial stretching.

In the present invention, the amount of the oil permeating from the fluorine-based porous member to the object to be measured is 1.7 × 10 ^{−5 to} 3.5 × 10 ⁻³ μl / cm ² · cm. s
ec is preferred. The amount of permeation of the oil is 1.
If it is less than 7 × 10 ⁻⁵ μl / cm ² · sec, the oil is less likely to permeate because of a small amount of oil permeated.
When it exceeds 5 × 10 ⁻³ μl / cm ² · sec, the amount of oil permeation is large, and the oil is consumed in a short time, so that the enemy is liable to wear over time.

The object to be measured is not particularly limited, and examples thereof include a rotating member such as a fixing roller and a photosensitive member. The force with which the temperature detecting device contacts the object to be measured is not particularly limited, and can be appropriately selected depending on the purpose.

Next, a specific example of the temperature detecting device of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view showing a first specific example of the temperature detecting device of the present invention. In the temperature detecting device 7 shown in FIG. 1, the outer surface of the contact portion with the fixing roller 5 which is the object to be measured is covered with a fluorine-based porous member 8. In the contact portion, the temperature detecting element 1 is supported by the thin metal plate 4 inside the fluorine-based porous member 8.
A lead wire (not shown) is connected to the temperature detecting element 1, and measurement data of the temperature detecting element 1 is transmitted as an electric signal to an analyzer such as a computer through the lead wire. As a result, the surface temperature of the object to be measured can be detected.

A small amount of oil is supplied to the surface of the fixing roller 5 by an oil supply member 9. In the temperature detecting device 7 of the first embodiment, the excess amount of the oil is absorbed by the fluorine-based porous member 8 and the frictional force between the fixing roller 5 and the temperature detecting device 7 is kept small. There is no wear on the roller 5 and no image quality defects.

FIG. 2 is a schematic explanatory view showing a second specific example of the temperature detecting device of the present invention. In the temperature detecting device 7 shown in FIG. 2, the outer surface of the contact portion with the fixing roller 5 which is the object to be measured is covered with a fluorine-based porous member 8. In the contact portion, a temperature sensing element 1 is installed inside the fluorine-based porous member 8, an elastic material 2 is installed inside the temperature sensing element 1, and a metal sheet 4 is installed inside the elastic material 2. is set up. Lead wire (not shown) for temperature sensing element 1
Are connected to each other.
Is transmitted as an electrical signal to an analyzer such as a computer. As a result, the surface temperature of the object to be measured can be detected.

The elastic member 2 is impregnated with oil in advance. The oil passes through the fluorine-based porous member 8 and is supplied to the contact surface between the fixing roller 5 and the temperature detecting device 7 in an appropriate amount. For this reason, in the temperature detecting device 7 of the second embodiment, even if oil as a releasing agent is not supplied to the fixing roller 5, the frictional force due to the contact between the fixing roller 5 and the temperature detecting device 7 is kept extremely low. As a result, the fixing roller 5 does not wear out, and there is no problem of deterioration in releasability and deterioration of image quality.

[0024]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Embodiment 1 and Comparative Example 1) FIG. 3 is a schematic explanatory view showing a temperature detecting device of Embodiment 1. In FIG.
2 is the same as FIG. 2 except that the fixing roller 5 in FIG. Fixing roller 5 in FIG.
HTV (High Temperature)
e Vulcanized) It has an elastic body of silicone rubber 11, and its surface is further covered with fluororubber 10. The above-described temperature detecting device 7 shown in FIG. 2 is in contact with the surface of the fixing roller 5 with a load of 10 g.

In FIG. 3, the fluorine-based porous member 8
Stretches polytetrafluoroethylene resin film
Porous by molding method (Japan Gore-Tech
GT sheet), and has a thickness of 15 μm.
The release agent supply member 9 releases the surface of the fixing roller 5 from the release agent.
4.8 × 10 amino-modified silicone oil as an agent
^-3μl / cm^TwoIs supplied at a supply rate of

FIG. 5 is a schematic explanatory view showing a temperature detecting device of Comparative Example 1. In the temperature detecting device 7 of the comparative example 1, the surface in contact with the fixing roller 5 is covered with a polyimide film (25 μm in thickness).

Using the temperature detecting devices of Example 1 and Comparative Example 1, 20,000 sheets of A4 size plain paper manufactured by Fuji Xerox Co., Ltd. were fixed on a blank white paper continuously by AColor935 manufactured by Fuji Xerox Co., Ltd. The presence or absence of an image quality defect after continuous fixing and the decrease in releasability were confirmed. The results are shown in Table 1.

[0029]

[Table 1]

As shown in Table 1, no abrasion was observed in Example 1, but abrasion of 2.5 μm was observed in Comparative Example 1. At this time, in order to observe the effect on the image quality, when the solid image was fixed using the fixing roller portion, which is the contact portion of the temperature detection element, the image quality defect was not generated in Example 1 at all. In Comparative Example 1, streak-like image quality defects were observed. Further, the releasability is changed by changing the fixing temperature of the solid image, and by separating the minimum fixing temperature (in a state where the solid image is not melt-fixed) and the high-temperature offset occurrence temperature (toner that has been melted excessively) between the toners. (The temperature at which the paper is transferred to the fixing roller and the paper is re-transferred after one rotation of the fixing roller). In Example 1, no decrease in releasability was observed, but in Comparative Example 1, a decrease in releasability was clearly observed.

(Examples 2 to 4) The fluorine-based porous member 8 in Example 1 was replaced with the polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer in Examples 2, 3, and 4, respectively.
Tetrafluoroethylene-hexafluoropropylene-
The procedure was the same as in Example 1 except that the particles of the perfluoroalkyl vinyl ether copolymer were sintered and produced, and the heat-resistant film having a thickness of 100 μm was used instead.

[0032]

[Table 2]

As shown in Table 2, the effect of the heat-resistant film formed by the sintering method was excellent as in the case of the heat-resistant film formed by the stretch molding method.

Example 5 and Comparative Example 2 In Example 1, except that the elastic member 2 was disposed between the temperature detecting element 1 and the thin metal plate 4 and the elastic member 2 was impregnated with oil. Same as 1. As the elastic material 2, a heat-resistant silicone sponge was used. The heat-resistant silicone sponge has a hardness of 15 degrees as measured by an Asker C (manufactured by Kobunshi Keiki) type hardness tester. The heat-resistant silicone sponge is previously impregnated with dimethyl silicone oil having a viscosity of 10,000 centistokes. Was. This dimethyl silicone oil can be supplied to the surface of the fixing roller 5 through the fluorine-based porous member 8. Note that the fixing roller 5 is
An aluminum core having an outer diameter of 50 mm and a thickness of 6 mm is coated with a 50 μm thick PFA Tube.

The fixing roller 5 is made of Fuji Xerox V
The temperature detection device of Example 5 was set in the fixing device of Ice 550. On the other hand, the temperature detecting device of Comparative Example 1 was set beside this, and this was designated as Comparative Example 3. At this time, since the cleaning web of the fixing roller was usually impregnated with dimethyl silicone oil, the cleaning web was removed. In this state, 20,000 (sheets) of white paper L was inserted and fixed, and the results of observing the amount of wear of the surface release layer of the fixing roller 5 and the occurrence of image quality defects at that time are shown in Table 3.

[0036]

[Table 3]

As shown in Table 3, in the case of the fifth embodiment,
No abrasion was observed and no image quality defect was observed, but in the case of Comparative Example 2, both abrasion and image quality defect were observed.

(Examples 6 to 16 and Comparative Example 3) Example 5
In, the viscosity of the dimethyl silicone oil, 50,
100, 500, 1,000, 5,000, 10,000
0, 20,000, 50,000, 100,000, 2
Replacement with 00,000 centistokes (Example 9
17) and the one not using the dimethyl silicone oil (Example 16) were prepared in the same manner as in Example 5. In the same manner as in Example 5, the fixing of blank paper
After running to 0 (sheets), 20,000 (sheets), and 40,000 (sheets), the amount of wear of the fixing roller over time and image quality defects were observed. Further, a test using a conventional polyimide film (Comparative Example 3) was also tested. Table 4 shows the results.

[0039]

[Table 4]

As shown in Table 4, when the viscosity of the oil was 50 centistokes or less, abrasion was confirmed relatively early because the amount of oil permeating through the fluorine-based porous member 8 was low when the viscosity was low. Is relatively large, the amount of retained oil is reduced at an early time, and as a result, oil is not supplied to the interface between the fluorine-based porous member 8 of the temperature detecting device 1 and the fixing roll 5. On the other hand, if the oil viscosity is 1
When it exceeds 000 centistokes, abrasion is observed from a relatively early stage. This is because the viscosity of the oil is so high that the permeation amount of the oil is very small. This is because it was difficult to supply oil to the interface between the fixing roller 8 and the fixing roller 5.

Further, as shown in Comparative Example 3, in the prior art, abrasion was relatively large, and image quality defects were found early. On the other hand, in the embodiment of the present invention, the oil viscosity is 100 to
If it is 100,000 centistokes, there is no problem, and the recommended oil viscosity is 1,000 to 20,000.
00 centistokes is preferred, 5,000-10,
000 centistokes is considered more preferred.
Further, as shown in Example 16, in the case where the elastic material was not impregnated with the oil at all, the abrasion level was worse than that in the case where the oil was impregnated, but in comparison with the conventional one (Comparative Example 3). If so, the level is good.

(Examples 17 to 22) In Examples 6 to 15, the viscosity of the oil was changed to obtain the effect of the present invention.
When the oil is used at less than 000 centistokes, the oil permeates a relatively large amount per unit time. Therefore, it is conceivable that the oil disappears as soon as possible during long-term use and the effect of the present invention cannot be sufficiently obtained. Therefore, the fluorine-based porous member 8 is used so that even oil having a low viscosity can be used.
To reduce the porosity (area of holes per unit area).

As a method of reducing the porosity, for example, at the time of manufacturing the fluorine-based porous member 8, the stretching level may be reduced by using the stretching molding method, or the sintering may be performed by using the sintering molding method. The porosity can be reduced by reducing the size of the particles and by changing the firing time and temperature.
Since these are specially manufactured and the cost is high, different from these methods, it was studied to reduce the porosity by devising a commercial product.

That is, an appropriate amount of gel silicone oil is impregnated into a fluororesin-based film, and this is heated and vulcanized to close an appropriate amount of pores. At this time, the gel silicone oil was not exposed on the surface in contact with the object to be measured. This is because, when the object to be measured is a moving body, when exposed, the frictional force becomes extremely large, and it is easily considered that both the temperature detecting device and the object to be measured are destroyed. With this method, these effects were observed in the same manner as in Examples 6 to 16. The viscosity of the oil at this time is 100
Those of 00, 5000, 1000, 500, 100, 50 centistokes were impregnated. Table 5 shows these results.
Examples 17 to 22 are shown in FIG.

[0045]

[Table 5]

As shown in Table 5, it is considered that the effect of the present invention can be obtained even when the viscosity of the oil is low, if the fluorine-based porous member 8 is impregnated with an appropriate amount of gel-like silicone oil. Can be However, in the case of 50 centistokes, since the viscosity is too low, the permeation amount is large, and there is a concern that the oil in the elastic material is quickly lost and the effect of the present invention is reduced. Therefore, the recommended viscosity of the oil is considered to be 100 centistokes or more. Considering the examples 6 to 16 and the examples 17 to 22 together, the appropriate range of oil viscosity is 10
It is considered 0-100,000 centistokes.

(Examples 23 to 27)
Table 6 shows the amount of oil permeating the fluorine-based porous member 8. The oil permeation amount at this time was determined in Examples 6-1.
In the case of No. 6, the amount of oil used when one A4 sheet is inserted is expressed as a transmission amount from the amount of change in the weight of the temperature detection device itself when continuous white paper fixing is performed.

[0048]

[Table 6]

From Table 6, the appropriate amount of oil permeation is
It is considered to be 1.6 × 10 ^{−5 to} 3.2−10 ⁻³ μl / cm ² . If this is converted into a permeation amount per second, since the paper insertion speed of the tester is 0.92 sheets / sec, it is 1.7 × 10 ^{−5 to} 3.5 × 10 ⁻³ μl / cm ² · sec.
c.

(Examples 28 to 31 and Comparative Examples 4 and 5) The thickness of the fluorine-based porous member 8 was examined. The most important thing is how fast and accurately the temperature of the temperature detecting device 1 can be measured. Therefore, a temperature detecting device in which the thickness of the fluorine-based porous member 8 on the temperature measuring surface side of the temperature detecting device 1 in which the silicone sponge which is the elastic material 2 is installed on the opposite side to the temperature measuring unit of the temperature detecting device 1 is changed. 1 was brought into contact with a temperature-measured object controlled at a constant of 140 ° C., and the time until the temperature of 130 ° C. was indicated was measured. FIG. 4 shows the measurement results.

FIG. 5 shows that the thickness of the stretched porous film of polytetrafluoroethylene resin as the fluorine-based porous member 8 is 10, 60, 9 respectively.
0, 350 μm (Examples 28, 29, 30,
31) and the result of the case where no porous film was provided (Comparative Example 4) and the conventional polyimide film having a thickness of 60 μm (Comparative Example 5).

As shown in Comparative Example 5, some time is required even if no film is installed on the installation surface side because of the heat capacity of the temperature sensing element itself and the silicone sponge as an elastic material. Conceivable. Further, even when the thickness of the example is the same as that of the comparative example 5 which is a conventional product, the time required to reach 130 ° C. is shorter because the porous material is used.
This is probably because the heat capacity is small. These are not impregnated with oil, but when impregnated with oil, the amount of oil contained in the porous film is negligible and can be ignored. From the above, the thickness of the porous film (fluorine-based porous member) was 150 μm
Within is appropriate.

Although a stretch-molded film was used here, almost the same results were obtained with a sintered-molded film. As the material of the fluorine-based porous member, a polytetrafluoroethylene resin was used, but a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer and a tetrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymer were used. Even so, the same result is obtained because the thermal conductivity and the heat capacity (density) are almost the same. 5 μm or more is the limit in the production of fluorine-based porous members, and considering its handling (installability to the sensor), 8 μm
The above is considered appropriate. It is considered that the optimum thickness of the fluorine-based porous member is 8 to 150 μm.

[0054]

According to the present invention, the above-mentioned conventional problems can be solved. Further, according to the present invention, even in long-term use, the deterioration of the image quality and the releasability of the fixing roller due to the friction and abrasion between the temperature detecting element and the fixing roller do not occur. A high-performance temperature detection device capable of stably, accurately, and quickly detecting the surface temperature of the object to be measured can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first specific example of a temperature detecting device according to the present invention.

FIG. 2 is a schematic explanatory view showing a second specific example of the temperature detecting device of the present invention.

FIG. 3 is an explanatory diagram in a case where a fixing roller, which is an object to be measured, is changed in FIG. 2;

FIG. 4 is a diagram showing the relationship between the thickness of a fluorine-based porous member and the time required to reach a general fixing temperature of 130 ° C.

FIG. 5 is a schematic explanatory view showing a temperature detection device of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature detection element 2 Elastic material 3 Heat resistant tape 4 Metal thin plate 5 Fixing roller 6 Heater lamp 7 Temperature detection device 8 Fluorine-based porous member 9 Oil supply member 10 Fluorine rubber 11 Silicone rubber

Claims (8)

[Claims] 1. A temperature detecting device for detecting a surface temperature of an object to be measured, wherein an outer surface of a contact portion with the object to be measured is coated with a fluorine-based porous member. Temperature sensing device. 2. The temperature detecting device according to claim 1, wherein the fluorine-based porous member is a heat-resistant film formed by a stretch molding method. 3. The fluorinated porous member is at least one selected from polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer and tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer. 2. A heat-resistant film formed by sintering and molding a seed.
4. The temperature detection device according to claim 1. 4. The temperature detecting device according to claim 1, wherein the contact portion has an elastic material impregnated with an oil permeable to the fluorine-based porous member. 5. The amount of oil transmitted from the fluorine-containing porous member to the object to be measured is from 1.7 × 10 ^{−5 to} 3.5 ×.
The temperature detecting device according to claim 4, wherein the temperature is 10 ^-3 µl / cm ² · sec. 6. The temperature detecting device according to claim 4, wherein the oil is a silicone oil, and the viscosity of the oil is from 10 ² to 10 ⁵ centistokes. 7. The temperature detecting device according to claim 4, wherein the oil is gelled. 8. The temperature detecting device according to claim 1, wherein the thickness of the fluorine-based porous member is at most 150 μm.