JPH0786728B2 - Elastic rotating body and fixing device having the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating roller, a pressure roller, or a heat pressure roller, which is used in an image forming apparatus such as a copying machine, a printing machine, a facsimile machine, a printer, or a composite machine of these. The present invention relates to an elastic rotary member such as a roller or a general transport rotary member (including a belt-shaped rotary member) and a fixing device having the elastic rotary member.

[Prior Art According to the Present Invention]

Conventionally, rotating bodies such as rollers and belts that are often used in the field of paper transportation have not only transportability but also durability, and appropriate elasticity and surface rigidity so as not to impair the condition of the article being transported. There is a demand for a rotating body that has both

2. Description of the Related Art Conventionally, there is a heating and fixing rotator that is used under severe conditions in this field. A roller having a core metal coated with tetrafluoroethylene resin is used as a heating roller in contact with the toner image, and a roller coated with a rubber layer is used as a pressure roller in pressure contact with the heating roller to increase the heating and pressing time of the toner image. Is common.

However, since the surface of the heating roller provided on the toner image side is close to a rigid body, when the toner image is pressed to transfer heat, it is less familiar to the paper surface and the unevenness of the toner image, and is effective. Less heat transfer. Therefore, the obtained image quality and fixability are worse than when the rubber roller is used on the toner image side, and the amount of curl generated on the sheet on which the toner image is fixed is large. On the other hand, when a rubber roller is used as the toner side roller, the offset is increased due to the poor releasability, and the abrasion resistance is low, so that the contact member (separation claw, sensor, etc.) causes wear and causes partial fixing failure and partial offset. Will also increase.

As described above, both the rubber roller and the resin roller have advantages and disadvantages, and an elastic roller having these advantages has been desired, but none satisfy the conditions such as satisfactory durability. .

As a conventional example, a fixing roller having a resin layer on the surface and a rubber layer below the resin layer has been proposed.

However, this is one in which a mixed layer of fluororubber and fluororesin or a tetrafluoroethylene tube is provided on the rubber layer, but a fixing roller having a resin layer on the rubber layer has a rubber layer and a resin layer at the end of its durability. Of the resin layer, partial abrasion of the resin layer was observed, and the durability was about 10,000 to 50,000 sheets.

Such large variations not only cannot guarantee a stable quality of the product, but also require too many replacements, which makes maintenance extremely difficult. Therefore, it is the current situation that such a rotating body having a problem is hardly put into practical use.

For example, in the case where a mixed layer of fluorine resin and fluorine rubber is provided on the rubber layer, the fixing property is good, but the releasability gradually decreases due to the paper passing durability, and the offset toner is released after about 50,000 sheets. The fixing roller becomes dirty due to. In addition, a roller obtained by polishing the surface of a silicone rubber roller, applying an adhesive, and covering it with a heat-shrinkable resin tube (FEP: fluorinated ethylene propylene) with a diameter larger than the diameter of the rubber roller in advance and shrinking it by heat is obtained. It was often seen that the resin itself peeled off from the rubber because the shapes themselves had too much variation. Those that do not have this phenomenon have excellent durability, but have poor fixability, and are characteristically the same as when only resin is used for the surface layer. It was very inferior to the resin roller in terms of performance.

In any case, it is desired to prevent the durability of the elastic rotating body from deteriorating due to the local stress concentrated between the rubber layer and the resin layer when the sheet is nipped and conveyed, and to stabilize its characteristics. .

[Purpose of the present invention]

The present invention provides a fixing roller and a fixing device including the fixing roller, which is epoch-making for the fixing roller and the apparatus including the fixing roller.

An object of the present invention is to provide a fixing roller which has surface resin characteristics, has moderate elasticity as a whole, and can be superior in fixing property, abrasion resistance, and durability as compared with conventional fixing rollers, and a fixing device having the fixing roller. is there.

[Summary of the Invention]

The present invention achieves the above object, and paying attention to the relationship between the resin layer and the rubber layer of the elastic rotating body, and that the surface state of the rubber layer determines the adhesion and durability of the resin layer. It has been investigated and is characterized by the following new components.

That is, the present invention is an elastic rotating body having a resin layer on an elastic layer and a fixing device having the elastic layer, and the resin layer is formed by applying a resin on the roughened elastic layer surface and baking the resin. It is a resin coating, and the maximum thickness td (μ) measured by physical contact of the resin layer peeled from the elastic layer and the thickness tw (μ) obtained from the weight conversion of the resin layer are 0.5 ≦ (td−tw ) satisfy the relation of ≦ 5, the maximum outer diameter of the elastic rotating member after the outer diameter value d ₁ and the resin layer was measured by a non-contact measuring an outer diameter of the elastic rotation body in the state having a resin layer was peeled from the elastic layer The thickness tm (μ) calculated by 1/2 of the difference (d ₁ −d ₂ ) from the outer diameter value d ₂ measured by non-contact measurement is tw> tm with respect to the thickness tw (μ) An elastic rotating body and a fixing device having the same are provided.

In particular, the present invention is particularly effective when the rubber layer is a silicone rubber layer and the resin layer is a tetrafluoroethylene resin layer baked at 327 ° C. or higher.

According to the configuration of the present invention, durability can be increased from tens of thousands at most to 1 million or more by normal paper conveyance, and fixing can be improved to 100,000 or more by several stages. be able to.

Further features of the present invention will be clarified below by the description of the embodiments.

Example of the present invention

FIG. 1 is an explanatory view of an embodiment of a fixing device of the present invention having a fixing roller of the present invention.

In FIG. 1, reference numeral 1 is a fixing roller on the side in contact with an unfixed toner image, and 2 is a pressure roller that rotates in pressure contact with the fixing roller 1.
Both are examples of the fixing roller of the present invention. The specific configuration is as follows.

The fixing roller 1 has a relatively thin silicon rubber (in this example, 0.3 mm to 0.8 mm) on a cored bar 11 having good heat conduction such as aluminum.
(a predetermined thickness within a range of mm) and an elastic layer 12 having a repulsion elastic modulus of 65% to 85%, and a PFA resin (tetrafluoroethylene resin;
Perfluoroalkoxy ethylene resin copolymer), PTFE
A fluorine resin such as (tetrafluoroethylene resin) is thinner than the elastic layer 12 (a predetermined thickness within the range of 10 μm to 25 μm in this example) and has a resin strength of 50 kg / cm ² or more. Similarly, the pressure roller 2 is thicker than the thickness of the silicone rubber elastic layer 12 on the core metal 21 such as stainless steel or iron (in this example, a predetermined thickness within the range of 4 mm to 10 mm), and its impact resilience is Is 6
5% to 85% of the elastic layer 22 and a fluorine resin such as PFA or PTFE on the elastic layer 22 are thinner than the thick elastic layer 22 (in this example, 5% to 85%).
and a resin layer 23 having a film strength of 50 kg / cm ² or more.

These rollers 1 and 2 are formed by the manufacturing method shown in FIG. 3 or a method conforming to its purpose.
Briefly, it includes the following steps.

A silicone rubber layer vulcanized and molded on the core metal (heat conductivity 1.
4 × 10 ^{−4 to} 1.5 × 10 ⁻³ ) to form a silicone rubber roller having a desired shape. A preferred shape is an inverted crown type in which the central portion has a slightly smaller diameter than both ends. The surface of this rubber roller is coated with unbaked fluororesin such as dispersion (a fluororesin powder dispersed in water with a surfactant), enamel or powdered fluororesin over the entire length of the rubber roller by spray coating, electrostatic coating or powder coating. Apply it to a uniform thickness by a method such as body painting. For example, the display purgeson is heated to a glass transition point of 327 ° C. or higher of the crystalline melting point of the fluororesin to form a film-shaped resin coating. Therefore, the silicon rubber roller coated with the unsintered fluorine resin needs to be heated to the crystal melting point or higher (PTFE 327 ° C or higher, PFA 306 ° C or higher).

However, although silicon rubber itself has excellent rubber properties such as impact resilience and compression set, it is more than 300 ° C, much less 3
When heated above 06 ℃ or 327 ℃, smoke or depolymerization occurs. These not only prevent the formation of a good quality fluororesin layer, but also impair the rubber properties of the silicone rubber itself. Therefore, heating the rubber layer loses the function of the rubber layer and the characteristics of the resin layer, and loses the conditions suitable for fixing.

For these reasons, in the examples of the present invention, the silicon rubber roller itself is kept under heating at a low temperature (up to 300 ° C. or less) so as not to cause smoking or depolymerization, and the crystal is formed in the coating layer of the fluororesin. A firing method that gives a high temperature state above the melting point was adopted.

Specifically, a method of rapidly heating the unsintered fluororesin on the surface while rapidly cooling the rubber layer from the inside of the core bar, or the dielectric loss tangent of the liquid fluororesin (dispersion, enamel) itself is the dielectric of the rubber layer. In addition to the dielectric heating method (see FIG. 3) utilizing the fact that it is greater than the tangent, any method that is suitable for this purpose is suitable for the present invention.

Although a thermal gradient is substantially formed in the thickness direction of the silicon rubber by this method, the temperature of about 260 ° C to 280 ° C is higher than the crystalline melting point of the unbaked fluororesin (specifically, PTFE is used). A firing temperature of 340 ℃ to 380 ℃ above 327 ℃ is 5
It is given for about 10 minutes. After this firing, the roller is quenched. By this quenching, the crystallinity on the silicon rubber roller is 95% or less and the tensile strength is 50 kg / cm ² or more,
A baked fluororesin surface layer showing a resin characteristic of a contact angle with water of 100 degrees or more is formed in a strongly adhered state to a rubber roller and is sufficiently thick.

Therefore, in the fixing roller 1 and the heating roller 2, the lower silicon rubber itself exhibits desired rubber characteristics almost the same as before the resin layer formation, and the surface fluororesin layer exhibits completely baked resin characteristics. The adhesion of the layer is strong.

Referring back to FIG. 1, another configuration of the fixing device will be described.

Reference numeral 3 denotes a heater such as a halogen lamp for heating the fixing roller from the inside, and the surface temperature of the fixing roller is the optimum temperature (at which the toner can be always melted by the heater 3, the temperature detecting element 4 and the control means 31). Specifically, 160 ° C to 200
℃) is maintained.

Reference numeral 5 denotes an offset prevention liquid application means that also serves as a cleaning means for applying an offset prevention liquid such as silicon oil to the surface of the fixing roller. The coating means 5 may be felt-like, but a web is used in this example. The web 51 containing the offset prevention liquid is brought into contact with the fixing roller 1 by the elastic pressing roller 52 such as silicon sponge, and a small amount of the offset prevention liquid is applied to the surface of the fixing roller 1. The web 51 is a take-up roller.
By 53, the web is gradually taken up from the supply roller 54, and the contact surface of the web with respect to the fixing roller 1 is sequentially recognized by the control means (not shown).

The recording paper P carrying the unfixed toner image T is fed to the entrance guide 6
The toner image T is permanently fixed on the recording paper P by passing between the roller pair 1 and 2 while being guided by the sheet.
The separation claw 41 that contacts the surface of the roller 1 is provided to separate the recording material from the surface 1 of the roller.

The fixing rollers 1 and 2 formed in this manner have sufficient impact resilience because they are completely non-existent, that is, the characteristics of the silicone rubber are not thermally deteriorated and the fluorine resin is completely baked. It enables the use of silicone rubber with less compression set, has excellent surface releasability and wear resistance, and has sufficient elasticity and high durability. Moreover, even if the stress generated when the toner image is fixed on the recording paper is concentrated between the silicone rubber layer and the fluororesin layer, the strength of the fluororesin layer is high,
The adhesion between them is also good.

In the above configuration, other characteristic configuration is as shown in FIG.
The thickness t ₁ of the elastic layer 12 of the fixing roller and the resin layer 13 of the fixing roller
Thickness t _2, the thickness t ₃ of the elastic layer 22 of the pressure roller, and a following relation thickness t ₄ of the pressure roller of the resin layer 23.

That is, the roller 1 has t ₁ > t _{2 the} roller 2 has t ₃ > t ₄ , and preferably t ₄ <t ₂ <t ₁ <t _{3 With} this configuration, basically, the fixing roller and the pressure roller are synergistic with each other. Due to the effect, the defects of each other are complemented and the advantages of each other are improved, and the obtained image quality and fixing property can be made excellent and the durability becomes excellent.

The resin layers of the fixing rollers 1 and 2 satisfy the following conditions with respect to the lower elastic layer. That is, the maximum thickness td (μ) measured by physical contact of the resin layer separated from the elastic layer and the thickness tw (μ) obtained by weight conversion of the resin layer are 0.5 ≦ (td−tw) ≦ 5. The outer diameter of the elastic rotating body satisfying the relationship and having the resin layer, the outer diameter value d ₁ measured by non-contact measurement and the maximum outer diameter of the elastic rotating body after peeling the resin layer from the elastic layer. The thickness tm (μ) calculated by 1/2 of the difference (d ₁ −d ₂ ) from the outer diameter value d ₂ measured by the non-contact measurement is tw> μ for the apparent thickness tw (μ). Meet the tm relationship.

In particular, if (tw-tm) is 3μ or more, the resin layer fits into the concave and convex portions of the elastic layer in correspondence with the concave and convex portions of the elastic layer, and moreover firmly adheres to the elastic layer so as to press the elastic layer, which is durable Good nature.

Hereinafter, specific examples will be described together with comparative examples.

As the fixing roller 1, the apparent thickness tw (μ) of the resin layer (PTFE) is 10 (μ), and the rubber layer of the elastic layer has an average surface roughness.
Rz is 10 (μ), rubber layer thickness is 0.5 mm, outer diameter is 40 mm
Rollers (laser length measuring device; measurement result by manufacture of Canon Inc.) were made by the same manufacturing method and several rollers were prepared.

The thickness td (μ) measured by a dial gauge and a micrometer, which are typical examples of physical contact, of the resin layer separated from the rubber layer by taking out two of the rollers is substantially the maximum thickness or close to this. It indicates the thickness, 11 to 13
It is represented as 12 when averaged by (μ). Then, with respect to the outer diameter value d ₁ of 40.012 mm measured by the non-contact measurement, the maximum outer diameter of the elastic rotating body after peeling the resin layer from the elastic layer is measured by the non-contact measurement by the laser measuring device. The diameter value d ₂ was 40 mm.

Therefore, the thickness tm (μ) calculated by 1/2 of the difference (d ₁ −d ₂ ) becomes 6 (μ), which is the apparent thickness.
Compared with tw (μ), the relationship of tw> tm is satisfied. Further, the thickness tw (μ) obtained from the weight conversion of the resin layer and the thickness td (μ) measured by this physical contact are (td-tw) = 1 to 3,
It is represented by the numerical value 2. This also satisfies the relationship of 0.5 ≦ (td−tw) ≦ 5.

The weight of the resin layer is measured by measuring the resin weight with a chemical balance and determining the specific gravity of PTFE to be 2.25 g / cm.
^3. Using the area (20 × 20) mm ² of the above resin, tw = weight / (product of specific gravity and surface area).

As the pressure roller; normal 10mm without the above structure
A thick silicone rubber roller was prepared.

When a fixing process was performed with the fixing device having this structure, no abnormality was found in the fixing roller even after fixing 300,000 sheets, and the fixing effect was stable and satisfactory. In addition, this fixing roller exhibited physical properties sufficient to withstand further durability.

As a comparative example, when the following fixing roller was manufactured and the same experiment was conducted, the results were as follows.

1) With roller A 5.5 ≤ (td-tw), roller smear was observed after feeding 50,000 sheets of Japanese industrial standard A4 size paper, and releasability was considerably inferior to offset toner. It was

2) Roller B 2 ≤ (td-tw) ≤ 3, but when 0 ≤ tm-tw ≤ 1, that is, when tw ≤ tm, the A4 size paper is fed longitudinally to fix 70,000 sheets. In the paper, cracks were generated on the roller surface corresponding to the passage portion of the paper edge, and partial peeling was observed.

3) When the roller C 2 ≦ (td−tw) ≦ 3 and (tw−tm)> 3 were satisfied, there was no problem even when the A4 size paper was fed vertically or 300,000 sheets were fixedly fed. Moreover, the fixing effect was excellent, and the releasability from the toner was also excellent.

According to the configuration in the range satisfying the above conditions, it is possible to obtain a fixing device having durability and a high fixing effect.

Among these conditions, (td-tw) has the following meaning. In the measurement by physical contact for obtaining td, the inner surface roughness of the resin inner surface (in the above example, the surface roughness of the lower elastic layer It is what is formed) is to quantify the equivalent. If the measured value td is larger than the apparent thickness tw, it means that the resin layer has entered the concave portion of the surface roughness of the elastic layer. If the surface roughness of the lower elastic layer is smooth, td becomes almost the same as tw, and conversely, if the roughness of this elastic layer is considerably large, td becomes much larger than tw.

In the condition constitution of the present invention, 0.5 ≦ (td−tw) ≦ 5 is the surface roughness of the elastic layer and the extent to which the resin layer enters the concave portion of the surface roughness of the elastic layer, durability, fixability and release. It specifies that the person is satisfied with sex.

If it is less than this range, the adhesive strength between the elastic layer and the resin layer is weak, and slippage occurs between these layers during durable use, and the resin layer swells. If it is larger than this range, the surface roughness of the elastic layer becomes large, and the surface roughness of the resin surface becomes large, so that the toner is contaminated.

In the conditional structure of the present invention, tw> tm indicates that the elastic layer is contracted by the resin layer, and indicates the adhesive force between the elastic layer and the resin layer, which is different from the surface roughness of the elastic layer.

In the present invention, since they have both of them, the resin layer with respect to the surface of the elastic layer creates an engaging close contact state of the concavo-convex portion at the contact portion with each other, and the convex portion of the elastic layer is formed by the contracting force of the resin layer By pressing and improving the adhesion to each other, the smoothness of the surface of the elastic roller is enhanced, and it is possible to easily convey 500,000 sheets in general conveyance, and as a fixing rotating body, it is possible to perform fixing processing of 200,000 sheets or more. It can be performed while maintaining an excellent fixing effect and releasability.

In the above structure, if 0.5 ≦ (td−tw) ≦ 5 and tw> tm, it becomes a standard as a prescribed condition when the above numerical value is determined as an average value. In particular, when 1.0 ≦ (td−tw) ≦ 3 and tw−tm> 3, 700,000 sheets can be easily conveyed by general conveyance, and the fixing rotating body can perform fixing processing of 300,000 sheets or more. It is more preferable because it can be performed while maintaining an excellent fixing effect and releasability.

As a method for obtaining the measured value in the above range, the average value of several point measurements is good, and more preferably, the upper limit and the lower limit of the measurement are satisfied within the above range.

When the rubber layer is silicone rubber, rubber hardness (JISA)
Is preferably 30 degrees or more and 80 degrees or less, and the elongation is 150% or more and 100
%, And the tensile stress is preferably 10 kg / cm ² or more.

As a fixing device, practically, a durable number of sheets of 100,000 or more and a fixing rate of 70% or more can be said to be preferable fixing roller conditions in terms of stability and reliability, but the present invention sufficiently satisfies these conditions.

FIG. 3 shows a firing method of the fixing roller of the present invention. The device shown in the figure is a specific example of a heating system that uses both an induction heating device and infrared external heating. The magnetron 105 and the high frequency (950MHz to 2450MHz) generated by the magnetron 105 are used.
A resin container 102 that can be opened and closed, and has a waveguide 106 for transmitting a wave and a metallic high-frequency reflection plate 103 on the inner surface connected to the waveguide.
And two infrared lamps for upper and lower infrared heating
1 and has a reflective shade.

In the resin container 102, a fan 100 for generating an air flow in the hollow of the fixing roller 1 as a fixing roller and a fan 101 for generating an air flow in the container 102 are respectively provided from driving means outside the container. It is rotatably provided by driving. This container can be opened and closed around the fulcrum 108 and has a handle at the top.
Numeral 09 is fixed to the arm 107 for positioning the flange 1A of the roller 1 at the bottom.

110 is a control means of the device, which is a drive means 104 and a magnetron 10
5 and the infrared lamp 111 are operated by a variable timer (not shown) for a predetermined time by inputting a closed state of the container and a predetermined start signal.

Since the fixing roller 1 has a silicon rubber layer as a lower layer and a fluororesin dispersion on the surface, a large amount of high frequency is absorbed in the dispersion having a relative dielectric constant larger than that of the silicone rubber layer. Therefore, the fluororesin dispersion is rapidly heated to a high temperature of 340 ° C. to 350 ° C. by high frequency, infrared rays and heating in a constant temperature bath. At this time, since the silicone rubber layer has a low high frequency absorption rate, it is heated to a temperature of about 280 ° C. or lower rather than being heated to a temperature higher than that of the discharge purgeon. This makes it possible to obtain the roller characteristics described above.

In the above examples, the fluororesin dispersion is, for example, tetrafluoroethylene resin dispersion D-1 manufactured by Daikin.
Is.

When the thickness of the resin layer in the present invention is 10 μ or more, the durability is 25
It can be improved to more than 10,000 sheets, and if it is set to 15μ or more, durability of 300,000 sheets or more can be obtained, and the fixing effect is reduced by supplementing the impact resilience of the rubber layer with the increase in thickness. Fixability can be maintained. The present invention is particularly effective when a fluororesin is provided on the silicone rubber layer.

In the present invention, in addition to the above-described embodiment, as the fixing roller, a roller-shaped other belt-shaped roller (for example, an intermediate belt for simultaneous transfer and fixing), a cleaning roller, and a release agent supply roller are included. In particular, since it has the releasability and elasticity of the fluororesin, it has transferability and cleaning property (however, the cleaning roller performs cleaning according to the order of surface energy, etc.) Prevents uniform application of the agent and transfer unevenness, and exerts the advantages of excellent abrasion resistance in each application.

Further, FIG. 1 shows an example of a heat fixing device, which is preferable as an embodiment of the present invention. A pressure fixing device for pressure fixing a toner image with a light pressure, a pressure for simultaneous transfer fixing, etc. The present invention can be applied to a fixing device or a heat fixing device.

Further, the above-mentioned example has a two-roller structure, but includes a heating roller, a pressure roller, a release agent supply roller of a fixing device having three or more rollers, or a cleaning roller and other belt-shaped rollers. The device is also included in the present invention.

[Effect of the present invention]

In the present invention, as described above, the resin layer with respect to the surface of the elastic layer creates a concave and convex engaging close contact state in the mutual contact portion, and the convex portion of the elastic layer is pressed by the contracting force of the resin layer to make the close contact with each other. As a result, the smoothness of the elastic roller surface is improved, and it is possible to easily convey 500,000 sheets in general conveyance. Even as a rotating body for fixing, a fixing effect of 200,000 or more sheets can be achieved with excellent fixing effect and release. It can be performed while maintaining sex.

The effects common to the fixing roller (including a belt-shaped roller) of the present invention are excellent in abrasion resistance and surface releasability, and the surface characteristics of the resin layer and the elastic characteristics of rubber are sufficiently exerted to obtain toner images and other It also has an excellent effect of following the roller, and has a very long life.

In the fixing device of the present invention, when the fixing roller is applied to one roller (including a belt) that presses the recording material, curling of the recording material is prevented, a fixed image is clear and the fixing property is good. Can be maintained for a longer period than ever before. Moreover, since the heat efficiency of fixing is high and the temperature required for fixing can be reduced (for example, about 20 ° C.), power consumption is reduced, and high-speed fixing recording can be achieved even with an apparatus having a small power distribution.

The elastic rotating body of the present invention has a considerably smooth surface and can reduce the need for polishing.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a fixing roller (including a belt-shaped roller) and a fixing device having the fixing roller according to the present invention.
FIG. 3 is a partially enlarged explanatory view of the fixing roller, and FIG. 3 is an explanatory view of an embodiment of a manufacturing method of the fixing roller. 1 is a fixing roller, 2 is a pressure roller, 12 and 22 are silicone rubber elastic layers, and 13 and 23 are fluororesin layers.

Front Page Continuation (72) Inventor Masahiro Goto 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Isamu Sakane 5-13-13 Ichiriyama, Otsu City, Shiga Prefecture S. T. (56) Reference JP-A-60-19178 (JP, A) JP-A-58-23072 (JP, A) JP-A-57-89785 (JP, A) JP-A-57-37382 (JP , A) JP-A-53-74436 (JP, A)

Claims (5)

[Claims] 1. An elastic rotating body having a resin layer on an elastic layer, wherein the resin layer is a resin coating film formed by applying a resin on a roughened elastic layer surface and firing the resin. Maximum thickness td measured by physical contact of the resin layer peeled from the layer
(Μ) and the thickness tw (μ) obtained from the weight conversion of the resin layer
Relative, 0.5 ≦ satisfy the (td-tw) ≦ 5 relationship, peeling the outer diameter value d ₁ and the resin layer was measured by a non-contact measuring an outer diameter of the elastic rotation body in the state having a resin layer of an elastic layer The thickness tm (μ) calculated by 1/2 of the difference (d ₁ −d ₂ ) between the maximum outer diameter of the elastic rotating body and the outer diameter d ₂ measured by non-contact measurement is tw (μ ), The elastic rotating body is characterized by satisfying the relationship of tw> tm. 2. The elastic rotating body according to claim 1, wherein the elastic layer is a silicone rubber layer and the resin layer is a fluororesin layer. 3. A fixing device for fixing an unfixed image by an elastic rotating body having a resin layer on an elastic layer, wherein the resin layer is formed by applying a resin on the roughened elastic layer surface and baking the resin. The maximum thickness td measured by physical contact with the resin layer separated from the elastic layer.
(Μ) and the thickness tw (μ) obtained from the weight conversion of the resin layer
Relative, 0.5 ≦ satisfy the (td-tw) ≦ 5 relationship, peeling the outer diameter value d ₁ and the resin layer was measured by a non-contact measuring an outer diameter of the elastic rotation body in the state having a resin layer of an elastic layer The thickness tm (μ) calculated by 1/2 of the difference (d ₁ −d ₂ ) between the maximum outer diameter of the elastic rotating body and the outer diameter d ₂ measured by non-contact measurement is tw (μ ), The fixing device is characterized by satisfying the relationship of tw> tm. 4. The fixing device according to claim 3, wherein the elastic rotary member is a heat fixing rotary member that has a heat source inside and is in contact with an unfixed image. 5. The fixing device according to claim 3 or 4, wherein the elastic layer is a silicone rubber layer and the resin layer is a fluororesin layer.