JP2001125412A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device having a supporting method by which a position of a holding member and/or a bearing member provided on both end parts of a translucent base body mainly using a glass member and the position of a press-contacting roller are regulated, and damage on an end part can be prevented, and also the damage at the end part of the translucent base body can be prevented. SOLUTION: As to this fixing device; a roll-like rotating member for heat ray fixing is formed by providing the cylindrical translucent base body having a heat ray irradiating means generating a heat ray inside and having translucency to the heat ray, and a heat ray absorbing layer absorbing the heat ray outside the translucent base body, both end parts of the translucent base body are held by the holding member and/or the bearing member, and also an interval L1 (mm) between the holding center positions of the translucent base body by the holding member and/or the bearing member is defined as L1/L=0.70 to 0. 98 with respect to the length L (mm) of the translucent base body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used for an image forming apparatus such as a copying machine, a printer, a facsimile, etc., and more particularly to a fixing device capable of quick start.

[0002]

2. Description of the Related Art Conventionally, as a fixing device used in an image forming apparatus such as a copying machine, a printer, a facsimile, etc., a heat roller fixing method has been used as a fixing device having high technical perfection and stability. Machine to full-color machine,
Has been widely adopted. However, a conventional heat roller fixing type fixing device is disadvantageous in terms of energy saving because it is necessary to heat a heat roller for fixing having a large heat capacity when heating a transfer material or toner. There is a problem that it takes time to warm up the apparatus, and the print time (warming-up time) becomes longer.

To solve this problem, a film (heat fixing film) is used, the heat roller is brought to the ultimate thickness of the heat fixing film to reduce the heat capacity, and a temperature-controlled heater (ceramic heater) is directly applied to the heat fixing film. A film fixing type fixing device and an image forming device using the same have been proposed, which greatly improve the heat conduction efficiency by being brought into contact with the pressure and achieve a quick start that saves energy and requires almost no warm-up time. Have been

Further, as a modification of the heat roller, a light-transmissive substrate is used as a heat ray fixing roller (rotating member for heat ray fixing), and heat rays from a halogen lamp (heat ray irradiating means) provided inside are radiated to the toner to heat and fix. A fixing method which does not require a warm-up time and achieves a quick start is disclosed in JP-A-52-106741, JP-A-57-82240, JP-A-57-102736, and JP-A-57-10274.
No. 1 and the like. Further, a light absorbing layer (heat ray absorbing layer) is provided on the outer peripheral surface of the light transmitting substrate to constitute a heat ray fixing roller (rotating member for heat ray fixing), and a halogen lamp (heat ray) provided inside the cylindrical light transmitting substrate. JP-A-59-65867 discloses a fixing method in which light from the irradiating means is absorbed by a light-absorbing layer provided on the outer peripheral surface of a light-transmitting substrate, and a toner image is fixed by heat of the light-absorbing layer. ing.

[0005]

The above-mentioned JP-A-52-10
The fixing device disclosed in Japanese Patent No. 6741 or the like discloses a method of irradiating a heat ray from a halogen lamp (heat ray irradiating means) through a translucent substrate to heat and fix the toner, and a method disclosed in JP-A-59-65867. In the fixing device,
A light absorbing layer (heat ray absorbing layer) is provided on the outer peripheral surface of the light transmitting substrate to constitute a heat ray fixing roller (rotating member for heat ray fixing), and heat rays from a halogen lamp (heat ray irradiating means) are passed through the light transmitting substrate. The method of irradiating the absorption layer and fixing the toner by the heat of the heat ray absorption layer aims at energy saving and quick start in which the warm-up time is shortened, but the fixing property is poor. Is provided with a translucent elastic layer consisting of a rubber material layer between a translucent substrate and a light absorbing layer (heat ray absorbing layer) to form a soft roller heat ray fixing roller, enabling quick start (rapid heating) Japanese Patent Application No. 10-128917 proposes a fixing device for improving the fixability of a toner image.

However, in the above-described fixing device, when a light-transmitting substrate provided mainly on a rotating member for fixing heat rays and mainly using a glass member is pressed against a pressing roller provided opposite to the rotating member for fixing heat rays. In addition, both ends of the light-transmitting substrate using a glass member are supported by a holding member and / or a bearing member. However, since there are many deformations at the ends and many cracks at both ends of the glass member, the light-transmitting substrate has both ends. There is a problem that the part is damaged.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and defines the positions of holding members and / or bearing members provided at both ends of a light-transmitting substrate mainly using a glass member, and the position of a pressure roller. It is an object of the present invention to provide a fixing device having a supporting method for preventing breakage of a light-transmitting substrate and preventing damage at an end of a light-transmitting substrate.

[0008]

An object of the present invention is to provide a fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein. A cylindrical light-transmitting base having a light-transmitting property, and a heat-ray absorbing layer for absorbing the heat rays provided outside the light-transmitting base to form a roll-shaped heat ray fixing rotating member, Both ends of the translucent base are held by a holding member and / or a bearing member, and a distance L between center positions of the holding of the translucent base by the holding member and / or the bearing member.
1 (mm) is achieved by the fixing device (first invention), wherein L1 / L = 0.70 to 0.98 with respect to the length L (mm) of the translucent substrate. You.

Another object of the present invention is to provide a fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein, and is transparent to the heat rays. A cylindrical light-transmissive substrate having optical properties, and a heat-ray absorbing layer for absorbing the heat rays provided outside the light-transmissive substrate to form a roll-shaped heat ray fixing rotating member, A pressure roller is provided to face the member, and both ends of the light-transmitting substrate are held by a holding member and / or a bearing member, and the length L2 (mm) of the pressure roller is adjusted by the holding member and / or the bearing. With respect to the distance L1 (mm) between the holding center positions of the translucent substrate by the member, L2 / L
This is achieved by a fixing device (second invention), wherein 1 = 0.80 to 0.95.

Another object of the present invention is to provide a fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein, and is transparent to the heat rays. A cylindrical light-transmissive substrate having optical properties, and a heat-ray absorbing layer for absorbing the heat rays provided outside the light-transmissive substrate to form a roll-shaped heat ray fixing rotating member, While providing a pressure roller facing the member,
A fixing member that penetrates the light-transmitting substrate and that is provided with holding members and / or bearing members at both ends of the light-transmitting substrate, and that supports the light-transmitting substrate from the pressure roller side; This is achieved by a device (third invention).

[0011]

Embodiments of the present invention will be described below. Note that the description in this column does not limit the technical scope of the claims and the meaning of terms. Further, the following assertive description in the embodiment of the present invention indicates the best mode, and does not limit the meaning or technical scope of the terms of the present invention.

An image forming process and each mechanism of an embodiment of an image forming apparatus using a fixing device according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional configuration view of a color image forming apparatus showing an embodiment of an image forming apparatus using a fixing device according to the present invention, and FIG. 2 is a side cross-sectional view of the image forming body of FIG. FIG. 3 is an explanatory view showing the structure of the fixing device. FIG. 4 is an enlarged cross-sectional configuration diagram of the roll-shaped hot-wire fixing rotating member of FIG.
FIG. 6 is a diagram showing a concentration distribution of a heat ray absorbing layer of the roll-shaped heat ray fixing rotating member of FIG. 3; FIG. It is a figure which shows a thickness.

According to FIG. 1 or FIG. 2, a photosensitive drum 10, which is an image forming body, is provided on the outer periphery of a cylindrical base formed of a light-transmitting member such as glass or light-transmitting acrylic resin. It is formed by forming a photoconductive layer and a photoconductor layer of an organic photosensitive layer (OPC). The photosensitive drum 10 is rotated clockwise as indicated by an arrow in FIG. 1 with the light-transmitting conductive layer grounded by power from a driving source (not shown).

In the present invention, the exposure beam for image exposure is
The photoconductor layer of the photoconductor drum 10, which is the image forming point, only needs to have an exposure light amount of a wavelength that can provide an appropriate contrast with respect to the light attenuation characteristic (photocarrier generation) of the photoconductor layer. . Therefore, the light transmittance of the light-transmitting substrate of the photosensitive drum in the present embodiment does not need to be 100%, and may have a characteristic of absorbing a certain amount of light when transmitting the exposure beam. . The point is that any suitable contrast can be provided. As a material of the light-transmitting substrate, an acrylic resin, particularly one obtained by polymerizing a methyl methacrylate monomer, is preferably used because of its excellent light-transmitting properties, strength, accuracy, surface properties, etc. Various translucent resins such as acryl, fluorine, polyester, polycarbonate, polyethylene terephthalate and the like used for the above can be used. Further, as long as it has a light-transmitting property with respect to the exposure light, it may be colored. As the light-transmitting conductive layer, indium tin oxide (I
TO), tin oxide, lead oxide, indium oxide, copper iodide, or a metal thin film of Au, Ag, Ni, Al, or the like that maintains light transmissivity. Reactive deposition method, various sputtering methods, various CV
D method, dip coating method, spray coating method and the like can be used.
Various organic photosensitive layers (OPC) can be used as the photoconductor layer.

The organic photosensitive layer serving as the photosensitive layer of the photoconductor layer includes a charge generation layer (CGL) mainly composed of a charge generation substance (CGM) and a charge transport layer (CTM) mainly composed of a charge transport substance (CTM). And CTL). An organic photosensitive layer having a two-layer structure has high durability as an organic photosensitive layer due to its thick CTL and is suitable for the present invention.
The organic photosensitive layer may have a single layer structure containing a charge generation material (CGM) and a charge transport material (CTM) in one layer. ,
Usually, a binder resin is contained.

A scorotron charger 11 as a charging means described below, and an exposure optical system 1 as an image writing means will be described.
2. The developing device 13 as a developing unit is prepared for an image forming process for each color of yellow (Y), magenta (M), cyan (C) and black (K), respectively. Are arranged in the order of Y, M, C, and K with respect to the rotation direction of the photosensitive drum 10 indicated by the arrow in FIG.

Scorotron charger 11 as charging means
Is mounted so as to face and be close to the photosensitive drum 10 in a direction perpendicular to the moving direction of the photosensitive drum 10 as an image forming body (the direction perpendicular to the plane of FIG. 1). A control grid (no symbol) maintained at a predetermined potential with respect to the body layer;
As a, for example, a sawtooth electrode is used, and a charging action (in this embodiment, negative charging) is performed by corona discharge having the same polarity as that of the toner, thereby giving a uniform potential to the photosensitive drum 10. As the corona discharge electrode 11a, a wire electrode or a needle electrode may be used.

The exposure optical system 12 for each color is a linear exposure element (LED) in which a plurality of LEDs (light emitting diodes) as light emitting elements of image exposure light are arranged in an array parallel to the axis of the photosensitive drum 10. (Not shown) and a selfoc lens (not shown) as an equal-magnification imaging element are configured as an exposure unit attached to a holder. Columnar holder 20
Then, an exposure optical system 12 for each color is attached and housed inside the base of the photosensitive drum 10. In addition, as the exposure element, a linear element in which a plurality of light emitting elements such as FL (phosphor emission), EL (electroluminescence), and PL (plasma discharge) are arranged in an array is used.

An exposure optical system 12 as an image writing means for each color sets an exposure position on the photosensitive drum 10 between the scorotron charger 11 and the developing unit 13 and the photosensitive unit with respect to the developing unit 13. It is arranged inside the photoconductor drum 10 in a state provided on the upstream side in the rotation direction of the drum 10. The exposure optical system 12 performs image processing based on image data of each color sent from a separate computer (not shown) and stored in a memory, and then performs image exposure on the uniformly charged photosensitive drum 10. Then, a latent image is formed on the photosensitive drum 10. The emission wavelength of the light emitting element used in this embodiment is usually Y, M,
The toner C having a high light transmittance in the range of 680 to 900 nm is preferable, but since the image exposure is performed from the back surface, a shorter wavelength than the color toner which does not have sufficient light transmittance may be used.

The developing device 13 as a developing means for each color includes
Inside yellow (Y), magenta (M), cyan (C)
Alternatively, it contains a black (K) two-component (or one-component) developer and is formed of, for example, a cylindrical non-magnetic stainless steel or aluminum material having a thickness of 0.5 to 1 mm and an outer diameter of 15 to 25 mm, respectively. And a developing sleeve 13a as a developer carrier.

In the developing area, the developing sleeve 13a is kept out of contact with the photosensitive drum 10 with a predetermined gap, for example, 100 to 1000 μm, by abutting rollers (not shown). At the closest position, it rotates in the forward direction, and at the time of development, an AC voltage AC is superimposed on a DC voltage of the same polarity as the toner (in the present embodiment, a negative polarity) or a DC voltage with respect to the developing sleeve 13a. By applying the developing bias voltage, non-contact reversal development is performed on the exposed portion of the photosensitive drum 10. At this time, the precision of the development interval needs to be about 20 μm or less in order to prevent image unevenness.

As described above, the developing unit 13 transfers the electrostatic latent image formed on the photosensitive drum 10 by the charging by the scorotron charger 11 and the image exposure by the exposure optical system 12 in a non-contact state. Reversal development is performed with toner having the same polarity as the charge polarity of No. 10 (in the present embodiment, the photosensitive drum is negatively charged, and the toner has negative polarity). As shown in FIG. 2, the photosensitive drum 10 and the holder 20 as an exposure optical system holding member are located at the rear and front ends of the apparatus.
Drum flanges 10A and 10B each serving as a photosensitive drum supporting member for rotatably supporting the photosensitive drum 10
And optical system flanges 120A and 120B, which are exposure optical system support members for supporting the holder 20, are integrally formed via press-fitting or screws or other means. In the photosensitive drum 10, the drum flange 10A and the drum flange 10B, which are the photosensitive drum supporting members, have the bearing B1 and the bearing B1, respectively, with respect to the shaft 121 and the optical flange 120B integrated with the optical flange 120A of the holder 20. It is rotatably supported via B2.

The shaft 121 has a shaft portion 121A for holding the photosensitive drum 10, and a support shaft 130 as shaft holding means having an engagement hole 130A is provided on the rear device board 70. The linear bearing B4 is fitted into the engagement hole 130A, and the receiving member 130
The support shaft 130 is fixed to the device substrate 70 on the rear side by screws or the like with the a interposed therebetween. The support shaft 130 is located at the center of the gear G2 that meshes with the drive gear G1, and rotatably supports a conductive member 131 that integrates the gear G2 via a bearing B3. On the other hand, the apparatus substrate 70 on the front side of the apparatus has an opening 70A through which the photosensitive drum 10 having the exposure optical system 12 fixed to the holder 20 can be inserted and removed.

The holder 20 inserts the shaft portion 121A of the shaft 121 into the linear bearing B4 provided on the support shaft 130 with respect to the device board 70 on the rear side, and the shaft portion 121A
The engaging pin 121P inserted into the
The exposure optical system 12 is attached by regulating the angular relation position of the exposure optical system 12 by engaging with a V-shaped groove formed on the front side of the exposure optical system 12. The optical system flange 120C, which is a support member, is
With the front lid 120D pressed in the axial direction.
It is mounted at a predetermined position by fixing with.

A coupling 10C attached to a side surface of a drum flange 10A, which is a photosensitive drum supporting member for supporting the photosensitive drum 10, a drive pin 131A attached to a side surface of a conductive member 131 integrated with a gear G2, and a set screw 51, the drum flange 10A and the gear G2
When the photoreceptor drum 10 having the holder 20 is integrated, the drum flange 10
A coupling 10C attached to the side of A is a drive pin 1 attached to the side of a conductive member 131 having a gear G2.
31A, and after engagement, the photoconductive drum 1 having the conductive member 131 having the gear G2 and the drum flange 10A
The drive pin 131 is set from the side of the photoreceptor drum 10 by using the set screw 51 with the center and the outer peripheral surface aligned.
A and the coupling 10C are fixed, and the drum flange 1
0A and the gear G2 are connected and fixed.

When the image forming body drive motor (not shown) is started by the start of image formation, the rotational power of the drive gear G1 is transmitted to the photosensitive drum 10 via the connecting portion by the gear G2, and the photosensitive drum 10 is moved to the position shown in FIG. , And at the same time, application of a potential to the photosensitive drum 10 is started by the charging action of the Y scorotron charger 11.
After a potential is applied to the photosensitive drum 10, exposure by the first color signal, that is, an electric signal corresponding to Y image data is started in the Y exposure optical system 12, and the surface of the photosensitive drum 10 is rotated by the rotational scanning. An electrostatic latent image corresponding to the yellow (Y) image of the original image is formed on the photosensitive layer. This latent image is reversely developed in a non-contact state by the Y developing device 13, and a yellow (Y) toner image is formed on the photosensitive drum 10.

Next, the photoreceptor drum 10 places an M scorotron charger 11 on the yellow (Y) toner image.
A potential is applied by the charging action of the M exposure optical system 12
Exposure is performed using an electrical signal corresponding to the second color signal of m, i.e., magenta (M) image data.
Yellow (Y) by non-contact reversal development
A toner image of magenta (M) is formed on the toner image of FIG.

According to the same process, the cyan (C) toner image corresponding to the third color signal is further processed by the C scorotron charger 11, the exposure optical system 12 and the developing device 13, and the K scorotron charger 11. , Exposure optical system 1
A black (K) toner image corresponding to the fourth color signal is sequentially superimposed and formed by the second and developing units 13, and a color toner image is formed on the peripheral surface within one rotation of the photosensitive drum 10. You.

As described above, in this embodiment, Y, M,
The exposure of the organic photosensitive layer of the photoconductor drum 10 by the C and K exposure optical systems 12 is performed through a transparent substrate from the inside of the photoconductor drum 10. Therefore, the exposure of the image corresponding to the second, third, and fourth color signals can form an electrostatic latent image without being shielded by the previously formed toner image, which is preferable. Photoconductor drum 1
0 may be exposed from outside.

On the other hand, the recording paper P as a transfer material is sent out from a paper feed cassette 15 as a transfer material storage means by a feed-out roller (no code), fed by a feed roller (no code), and fed to a timing roller. It is conveyed to 16. The recording paper P is synchronized with the color toner image carried on the photosensitive drum 10 by the driving of the timing roller 16, and is attracted to the transport belt 14a by the charging of the paper charger 150 as the paper charging means. The paper is fed to the transfer area. The recording paper P, which is closely transported by the transport belt 14a, is moved around the photosensitive drum 10 by a transfer unit 14c as a transfer unit to which a voltage having a polarity opposite to that of the toner (positive polarity in the present embodiment) is applied in a transfer area. The color toner images on the surface are collectively transferred to the recording paper P.

The recording paper P on which the color toner image has been transferred is
The paper is discharged by a paper separation AC neutralizer 14h as a transfer material separating unit, separated from the transport belt 14a, and transported to the fixing device 17. The fixing device 17 includes a heat ray fixing roller 17a as an upper roll-shaped heat ray fixing rotating member (upper fixing member) for fixing a color toner image;
The heat ray fixing roller 17a includes a pressure roller 47a as a lower fixing member, and inside the heat ray fixing roller 17a, a halogen lamp 171g or a xenon lamp (not shown) that emits heat rays such as infrared rays or far infrared rays including visible light depending on the light source. )
Are provided as heat ray irradiation means.

Heat ray fixing roller 17a and pressure roller 47a
The recording paper P is sandwiched by a nip portion N formed between
By applying heat and pressure, the color toner image on the recording paper P is fixed, and the recording paper P is sent by the paper discharge roller 18 and discharged to a tray on the upper portion of the apparatus. The toner remaining on the peripheral surface of the photosensitive drum 10 after the transfer is cleaned by a cleaning blade 19a provided in a cleaning device 19 as an image forming body cleaning unit. The photosensitive drum 10 from which the residual toner has been removed is uniformly charged by the scorotron charger 11, and enters the next image forming cycle.

As shown in FIG. 3, the fixing device 17 includes a heat ray fixing roller 17a as a roll-shaped heat ray fixing rotating member (upper fixing member) having an upper elasticity for fixing a toner image on a transfer material. And a pressure roller 47a as a lower fixing member also having elasticity, each formed between the heat ray fixing roller 17a having elasticity and the pressure roller 47a, and having a width of 15 mm or less, preferably 5 mm or more. At a wide nip portion N, the recording paper P that enters the nip portion N and passes through the nip portion N is nipped, and the toner image on the recording paper P is fixed by applying heat and pressure. On the heat ray fixing roller 17a serving as a roll-shaped heat ray fixing rotating member (upper fixing member) provided on the upper side, the fixing separation claw TR3, the fixing oil cleaning, and the rotating direction of the heat ray fixing roller 17a from the position of the nip portion N. A roller TR1, a heat equalizing roller TR4, and an oil application roller TR2 are provided. Oil is applied to the heat ray fixing roller 17a by an oil application roller TR2 in which a felt member impregnated with oil is wound around a cylindrical aluminum pipe or paper tube. Is done. The oil on the peripheral surface of the heat ray fixing roller 17a is cleaned by the fixing oil cleaning roller TR1. Therefore, the heat uniformizing roller TR4 and
A temperature sensor TS1, which is a temperature detecting means for measuring the temperature of the heat ray fixing roller 17a, is provided on the peripheral surface of the heat ray fixing roller 17a which has been cleaned between the fixing oil cleaning roller TR1 and the oil application roller TR2. The transfer material after fixing is separated by the fixing separation claw TR3. In addition, a metal roller member having good thermal conductivity such as an aluminum material or a stainless steel material, or a heat equalizing roller TR using a heat pipe.
4, the heat generation temperature distribution on the peripheral surface of the heat ray fixing roller 17a heated by the heat ray absorption layer 171b is made uniform. The heat uniformizing roller TR4 equalizes the temperature unevenness of the heat ray fixing roller 17a in the vertical and horizontal directions due to the passage of the transfer material.

A heat ray fixing roller 17a as a heat ray fixing rotating member (upper fixing member) for fixing a toner image on a transfer material includes a cylindrical light-transmitting substrate 171a and a light-transmitting substrate 171a. A translucent elastic layer 171 on the outside (outer peripheral surface)
d, a heat ray absorbing layer 171b and a release layer 171c are provided in that order as a soft roller. Translucent substrate 17
A halogen lamp 171g or a xenon lamp (not shown), which is a heat ray irradiating means for emitting heat rays such as infrared rays or far infrared rays including visible light depending on the light source, is disposed inside 1a. Heat ray fixing roller 1 as rotating member for heat ray fixing
7a is configured as a highly elastic soft roller as described later. Heat rays emitted from a halogen lamp 171g or a xenon lamp (not shown) are used as heat ray absorbing layers 171b.
Thus, a heat-fixing rotary member in the form of a roll that can be absorbed and rapidly heated is formed.

A pressure roller 47a as a lower fixing member includes, for example, a metal core 471a made of an aluminum material, and a silicon rubber layer, a fluorine rubber layer, or a silicon rubber layer on the outer peripheral surface of the metal core 471a. A roller member is formed by a sponge-shaped rubber roller layer 471b made of a thick rubber layer having a thickness of 5 to 20 mm using a foam material, and has a releasability on the outer side (outer peripheral surface) of the rubber roller layer 471b of the roller member. It is configured as an elastic soft roller coated with a tube 471c of a heat-resistant fluororesin such as PFA or PTFA. Further, a heat equalizing roller T using a metal roller member having good thermal conductivity, such as an aluminum material or a stainless steel material, which rotates by being in contact with the surface of the rubber roller 471b.
R4 is provided, and the heat uniformizing roller TR4 uniformizes the heat generation temperature distribution on the peripheral surface of the pressure roller 47a. As the heat uniformizing roller TR4, it is preferable to use a heat pipe that serves both heat storage and heat radiation. A metal pipe roller such as aluminum can be used instead of the pressure roller 47a.

A flat nip N is formed between the upper soft roller and the lower soft roller, and the toner image is fixed. TS1 is a temperature sensor which is a temperature detecting means using, for example, a contact type thermistor for performing temperature control attached to the upper heat ray fixing roller 17a, and TS2 is a temperature controller attached to the lower pressure roller 47a. For example, is a temperature sensor using a contact-type thermistor. As the temperature sensors TS1 and TS2, a non-contact type sensor can be used in addition to a contact type sensor.

According to FIG. 4, the configuration of the heat ray fixing roller 17a is, as shown in cross section in FIG. 4 (a), as a cylindrical light transmitting substrate 171a having a thickness of 1 to 20 mm, preferably 2 to 20 mm. Pyrex glass, sapphire (Al) that is 5 mm thick and transmits heat rays such as infrared rays or far infrared rays from a halogen lamp 171 g or a xenon lamp (not shown)
Ceramic materials such as ₂ O ₃ ) and CaF ₂ (thermal conductivity is (5 to 5)
20) × 10 ⁻³ J / cm · s · K, specific heat of (0.5 to
2.0) × J / g · K and a specific gravity of 1.5 to 3.0) are mainly used.

The light-transmitting elastic layer 171d has a thickness of 0.5 mm.
As described above, preferably, a silicon rubber layer having a thickness of 6 mm or less is used, and is formed of a heat-transmissive silicon rubber layer or a fluoro rubber layer (base layer) that transmits heat rays (infrared rays or visible rays including visible light depending on the light source). Translucent elastic layer 17
As 1d, in order to cope with a high speed, a method of improving the thermal conductivity by blending a powder of a metal oxide such as silica, alumina or magnesium oxide as a filler into the base layer is adopted. 10) × 10 ⁻³ J / cm · s ·
K, specific heat is (1-2) × J / g · K, specific gravity is 0.9-
A 1.0 silicon rubber layer or a fluorine rubber layer is used. The silicon rubber layer and the fluorine rubber layer are made of a light-transmissive substrate using a glass member having a thermal conductivity of (5-20) × 10 ⁻³ J.
/ Cm · s · K), it acts as a layer having a certain degree of heat insulation. When the thermal conductivity is increased, the rubber hardness generally tends to increase. For example, a rubber having a normal hardness of 40 Hs tends to have a hardness close to 60 Hs (JIS, A rubber hardness). Preferred rubber hardness is 5 Hs or more and 60 Hs or less (JIS, A rubber hardness). Most of the translucent elastic layer 171d of the heat ray fixing rotating member is occupied by the base layer, and the amount of compression during pressurization is determined by the rubber hardness of the base layer. The intermediate layer of the light-transmitting elastic layer 171d is made of a 20 to 300 μm fluorine-based rubber as an oil-resistant layer to prevent oil swelling.
It is preferable to form it with a thickness of m. The wavelength of the heat ray passing through the translucent elastic layer 171d is 0.1 to 20 μm.
m, preferably 0.3 to 3 μm, the filler used as a hardness or thermal conductivity modifier described above is:
The particle size is １ ／, preferably １ ／ or less of the wavelength of the heat ray,
Titanium oxide, aluminum oxide, oxide having an average particle diameter of 1 μm or less, preferably 0.1 μm or less, including primary and secondary particles, and having a heat ray transmission property (an infrared ray or a far infrared ray including visible light depending on a light source). Fine particles of metal oxides such as zinc, silicon oxide, magnesium oxide, and calcium carbonate are dispersed in a resin binder.
d may be formed. It is preferable that the average particle diameter including the primary and secondary particles in the layer is 1 μm or less, preferably 0.1 μm or less in order to prevent light scattering and reach the heat ray absorbing layer 171b. By providing the translucent elastic layer 171d, the heat ray fixing roller 17a as a heat ray fixing rotating member is provided.
Is configured as a highly elastic soft roller.

As the heat ray absorbing layer 171b, the remaining heat rays emitted from a halogen lamp 171g or a xenon lamp (not shown) and absorbed by the light transmitting base 171a and the light transmitting elastic layer 171d are used as the heat transmitting layer 171b. A heat ray fixing rotating member capable of absorbing 90 to 100%, preferably 95 to 100% of heat rays, which is about 100% of the heat rays transmitted through the 171a and the light transmitting elastic layer 171d, by the heat ray absorbing layer 171b and capable of rapid heating. As shown in FIG.
Carbon black, graphite, iron black (Fe ₃ ) in the silicone rubber or fluoro rubber used in 1d, or in the resin binder.
A heat ray absorbing member having a thickness of 10 to 500 μm, preferably 20 to 100 μm using a heat ray absorbing member mixed with powders such as O ₄ ), various ferrites and compounds thereof, copper oxide, cobalt oxide, and red iron oxide (Fe ₂ O ₃ ). The layer 171b is formed on the outside (outer peripheral surface) of the translucent elastic layer 171d by coating or spraying. The heat conductivity of the heat ray absorbing layer 171b is the same as that of the base layer of the translucent elastic layer 171d (the heat conductivity is (1 to 10)).
× 10 ⁻³ J / cm · s · K) (3 to 10)
0) × 10 ⁻³ J / cm · s · K. The specific heat of the heat ray absorbing layer 171b is (〜2.0) × J / g.
K, specific gravity is 〜0.9. Heat ray absorbing layer 171
As b, a metal roller member such as a nickel electroformed roller may be provided with a similar thickness. At this time, it is preferable that the inside (the inner peripheral surface) is subjected to black oxidation treatment in order to absorb heat rays. If the heat ray absorption rate in the heat ray absorption layer 171b is lower than about 90%, for example, about 20 to 80%, the heat ray leaks, and the heat ray fixing roller 17a as a heat ray fixing rotating member forms a monochrome image due to the leaked heat ray. When the black toner adheres to the surface of the specific position of the heat ray fixing roller 17a due to filming or the like, heat is generated from the adhering portion due to the leaked heat rays, and heat generated by heat ray absorption is further superimposed on the portion, thereby causing heat ray absorption. The layer 171b is damaged. Further, when used for forming a color image, the absorption efficiency of the color toner is generally low, and there is a difference in the absorption efficiency between the color toners, resulting in poor fixing or uneven fixing. Accordingly, the remaining heat rays emitted from the halogen lamp 171g or the xenon lamp (not shown) and absorbed by the light-transmitting base 171a and the light-transmitting elastic layer 171d form the light-transmitting base 171a and the light-transmitting elastic layer 171d. The heat ray absorption rate of the heat ray absorption layer 171b is about 100%, which is equivalent to 90 to 90%, so that the heat ray transmitted through the heat ray absorption layer 171b is completely absorbed by the heat ray absorption layer 171b.
100%, preferably 95 to 100%. Thereby, the color toner, which is difficult to fix by heat rays due to different spectral characteristics, is favorably melted. Particularly, in the color image formation in FIG. 1, it is difficult to fix by heat rays due to different spectral characteristics. The superimposed color toner image on the transfer material having a thick toner layer is fused well.
When the thickness of the heat ray absorbing layer 171b is less than 10 μm and thin, the heating rate by the heat ray absorption in the heat ray absorbing layer 171b is high, but the heat ray absorbing layer 1
This may cause breakage or insufficient strength of the heat ray absorbing layer 17b.
If the thickness of 1b exceeds 500 μm and becomes too thick, heat conduction becomes poor or the heat capacity becomes large, so that rapid heating becomes difficult. The heat ray absorption rate of the heat ray absorption layer 171b is approximately 100%
90 to 100%, preferably 95 to 100%, or the thickness of the heat ray absorbing layer 171b is 10 to 500 μm.
m, preferably 20 to 100 μm, local heat generation in the heat ray absorbing layer 171b is prevented, and uniform heat generation is performed. The wavelength of the heat ray projected on the heat ray absorbing layer 171b is 0.1 to 20 μm, preferably 0.3 to 20 μm.
Since the particle size is 3 μm, an adjuster for hardness and thermal conductivity is added as a filler, but the average particle size including primary and secondary particles having a particle size of ２, preferably １ ／ or less, of the wavelength of the heat ray is added. Titanium oxide, aluminum oxide, zinc oxide having a diameter of 1 μm or less, preferably 0.1 μm or less, which is heat-transmissive (in some cases, transmits infrared light or far-infrared light including visible light).
The heat ray absorbing layer 171b may be formed by dispersing 5 to 50% by weight of fine particles of a metal oxide such as silicon oxide, magnesium oxide, and calcium carbonate in a resin binder.
This allows the heat rays to enter the heat ray absorbing layer 171b and prevent heat generation at the interface. In this way, the heat capacity of the heat ray absorbing layer 171b is reduced so that the temperature rises immediately. Therefore, the temperature of the heat ray fixing roller 17a as a heat ray fixing rotating member is lowered, and the fixing unevenness occurs. To prevent. As the heat ray absorbing layer 171b, carbon black, graphite, iron black (Fe ₃ O ₄ ), various ferrites and their compounds, copper oxide, cobalt oxide, red iron oxide (F)
e ₂ O ₃ ) may be used. As the heat ray absorbing layer 171b, a metal film member such as a nickel electroformed belt can be used. At this time, it is desirable that the inside (inner peripheral surface) be subjected to black oxidation treatment in order to absorb heat rays.

The PF having a thickness of 20 to 100 μm is provided outside the heat ray absorbing layer 171 b (outer peripheral surface) separately from the heat ray absorbing layer 171 b in order to improve the releasability and fixability with the toner.
A (fluororesin) tube coated, fluororesin (PFA or PTFE) paint applied to 20 to 100 μm, or silicone rubber or fluororubber molded to a layer thickness of 20 to 500 μm. (3-10
0) A release layer 171c of × 10 ⁻³ J / cm · s · K is provided (separation type).

Further, as shown in the cross section in FIG.
Carbon black, graphite, iron black (Fe _ThreeO_Four) And various blowjobs
And its compounds, copper oxide, cobalt oxide, red iron oxide
(Fe_TwoO_Three) Etc.
Resin (PFA or PT)
FE) mixed with paint or silicone rubber or fluorine rubber
The heat ray absorbing layer 171 described above with reference to FIG.
b and the release layer 171c as a single unit having releasability.
The layer 171B is formed on the outer side (outer peripheral surface) of the translucent substrate 171a.
Form outside (outer peripheral surface) of the formed translucent elastic layer 171d
To form an elastic roll-shaped rotating member for fixing heat rays.
May be implemented. The thermal conductivity of the combined layer 171B is a heat ray absorbing layer.
171b is substantially the same as the thermal conductivity of (3-100) × 10
^-3J / cm · s · K. As mentioned above,
Lamp 171g or a xenon lamp (not shown)
The light-transmitting substrate 171a and the light-transmitting elastic layer 171d are
The remaining heat rays absorbed by the transparent base 171a and the transparent base 171a
Heat rays transmitted through the photoelastic layer 171d are completely absorbed.
As described above, the heat ray absorptivity of the dual-purpose layer 171B is set to approximately 100%.
90 to 100%, preferably 95 to 100%.
The heat ray absorptivity in the dual-purpose layer 171B is lower than about 90%.
If it is, for example, about 20 to 80%, heat rays leak and
Rotating member for fixing heat rays forms monochrome image due to heated heat rays
When used for heat ray fixing by filming, etc.
Leakage when black toner adheres to the surface of the transfer member at a specific position
Heat is generated from the attachment part by the heat rays, and further heat is generated in that part
Heat generation due to line absorption occurs repeatedly and damages dual-purpose layer 171B
I do. When used for color image formation,
Toner generally has low absorption efficiency and absorbs between color toners.
Poor fixing or fixing due to differences in yield efficiency
Become. Therefore, 171 g of a halogen lamp or xenon
Emitted from a lamp (not shown), the light-transmitting base 171a and
And the remaining heat rays absorbed by the translucent elastic layer 171d,
The light is transmitted through the light-transmitting substrate 171a and the light-transmitting elastic layer 171d.
Heat rays are completely absorbed in the heat ray fixing rotating member.
The heat ray absorptivity of the dual-purpose layer 171B is approximately 100%.
0-100%, preferably 95-100%. Ma
Further, local heat generation in the dual-purpose layer 171B is also prevented, and
Heat is generated. In addition, light is projected on the dual-purpose layer 171B.
The wavelength of the heat ray is 0.1-20 μm, preferably 0.3-3 μm.
μm, adjust hardness and thermal conductivity as filler
Agent is added, but the particle size is 1/2 of the wavelength of the hot wire, preferably
The average particle size including primary and secondary particles of 1/5 or less
Heat ray transmission of 1 μm or less, preferably 0.1 μm or less
(Depending on the light source, infrared or far infrared including visible light
Permeability) titanium oxide, aluminum oxide, zinc oxide,
Silicon oxide, magnesium oxide, calcium carbonate, etc.
Metal oxide fine particles dispersed in a resin binder
The dual-purpose layer 171B may be formed.

According to FIG. 5, the heat ray fixing roller 17a as a roll-shaped heat ray fixing rotating member (upper fixing member)
When the concentration distribution of the heat ray absorbing member described above is uniformly provided on the heat ray absorbing layer 171b as shown by the dotted line (a-1), the heat generation distribution of the heat ray absorbing layer 171b becomes as shown by the curve (b-1). The heat is concentrated on the heat ray absorbing layer 171b at the boundary, and the heat easily flows to the translucent elastic layer 171d side. Therefore, it is necessary to provide a concentration distribution and generate heat inside the heat ray absorbing layer 171b. Is preferred from the viewpoint of dispersing. For this reason, as shown by the dotted line (a-2) in the concentration distribution of the heat ray absorbing layer 171b, the inscribed translucent elastic layer 171 is shown.
The interface on the d side is made to have a low concentration and is gradually increased toward the outer peripheral surface side so as to be gradually higher, so that the thickness is smaller than the thickness of the heat ray absorbing layer 171b by ２〜 from the translucent elastic layer 171d side. 3
(About / 5 position) so as to obtain a concentration that absorbs 100% so as to be saturated. Thereby, the heat ray absorbing layer 17
The heat generation distribution due to the absorption of heat rays in 1b is represented by a curve (b-2).
As shown in the figure, the maximum value of the heat ray absorbing layer 171b is larger than the thickness t1 of the heat ray absorbing layer 171b from the interface.
From the 71d side, it is shifted so as to be located at about 1/3 to 2/5, and the outflow of heat is reduced.
Even when 1B is used, there is no influence even if the outer peripheral surface layer is shaved. Further, as shown by the dotted line (a-3),
It is preferable to form a saturated layer by providing an inclination, whereby the heat ray absorbing layer 171 is formed as shown by a curve (b-3).
The heat generation distribution b has a maximum value near the center of the heat ray absorbing layer 171b, and is formed in a parabolic shape having a minimum value near the interface and the outer peripheral surface of the heat ray absorbing layer 171b. Low, especially without the effect of heat outflow.
In short, if the absorption is sufficiently performed inside, the influence of the concentration on the outside disappears. There is no influence of shaving. Further, it is also possible to provide the above-mentioned inclination in the concentration distribution and adjust the heat generation distribution by changing the inclination angle.

As shown in FIG. 6, the outer diameter φ of the cylindrical translucent substrate 171a of the heat ray fixing roller 17a as a roll-shaped rotating member for heat ray fixing (upper fixing member) is 15 to 60 mm. As the thickness t, a thicker one is better in terms of strength and a thinner one is better in terms of heat capacity. However, from the relationship between strength and heat capacity, the outer diameter of the cylindrical light-transmitting base 171a is large. The relationship between φ and the thickness t is 0.02 ≦ t / φ ≦ 0.20, preferably 0.04 ≦ t / φ ≦ 0.10. When the outer diameter φ of the transparent substrate 171a is 40 mm, the thickness t of the transparent substrate 171a is 0.8 mm ≦ t ≦ 8 m.
m, preferably 1.6 mm ≦ t ≦ 4.0 mm. When t / φ is less than 0.02 in the translucent substrate 171a, the strength becomes insufficient, and when t / φ exceeds 0.20, the heat capacity increases and the heating of the heat ray fixing roller 17a is prolonged. Further, even if the translucent substrate 171a is used, it may absorb about 5 to 25% of heat rays depending on the material. Similarly, the translucent elastic layer 171d may have a thickness of 5 to 25 depending on the material.
% Of the heat ray may be absorbed, and it is preferable that the heat ray is thin as long as the strength can be maintained.

The use of the fixing device 17 described with reference to FIG. 3 makes it possible to provide a fixing device which is resistant to deformation at the fixing portion (nip portion) and capable of quick start (rapid heating). Due to the pressure in the soft fixing portion (nip portion) due to the elasticity of the member and the heating by the heat absorbing layer of the rotating member for fixing heat rays, the color toner which is difficult to fix by the heat rays due to different spectral characteristics. The melting is performed favorably, and quick start (rapid heating) fixing of the color toner becomes possible. Also, an energy saving effect can be obtained.

In the above, the light-transmitting elastic layer 171d is not provided, and the light-transmitting base 171a and the heat ray absorbing layer 171b and the release layer 171c on the outer side (outer peripheral surface) of the light-transmitting base 171a are provided.
Are provided in that order (or a dual-purpose layer 171B is provided on the outside (outer peripheral surface) of the light-transmitting base 171a) to form a heat ray fixing rotating member as a hard roller.
May be configured. In this case, the nip portion N formed between the pressure roller 47a and the soft roller has a structure in which the lower side is convex.

However, in the above-mentioned fixing device 17, the heat ray fixing roller 17a as a heat ray fixing rotating member is used.
Of the translucent substrate 171a mainly using a glass member,
At the time of pressure bonding with the pressure roller 47a provided opposite to the heat ray fixing roller 17a, since there are many deformations at the end of the light transmitting base 171a using a glass member and many cracks at both ends of the glass member, the light transmitting property is high. There is a problem that both ends of the base 171a are damaged.

The prevention of breakage of the end of the translucent substrate used in the fixing device for solving this problem will be described with reference to FIGS. FIG. 7 is an explanatory view of the definition of the position of the holding member and / or the bearing member for preventing damage at the end of the light-transmitting substrate, the position of the pressure roller, and the like.
FIG. 8 is a diagram illustrating an example of a supporting method for preventing damage at the end of the light-transmitting base, and FIG. 9 is a diagram illustrating another example of a supporting method for preventing damage at the end of the light-transmitting base. It is a figure showing the example of.

According to FIG. 7, the heat ray fixing roller 17a, which is a rotating member for fixing the heat ray of the fixing device 17, is a light transmitting base 17
1a and a translucent elastic layer 171d, a heat ray absorbing layer 171b, and a release layer 171c provided in that order on the outer side (outer peripheral surface) of the cylindrical translucent substrate 171a using a glass member. In parallel with the central axis, for example, a heat-resistant polyimide resin or polyphenylene sulfide resin (PPS) as a holding member for the light-transmitting substrate 171a provided on the heat ray fixing roller 17a is provided at both ends of the outer peripheral surface of the light-transmitting substrate 171a. Resin flange JF using a resin member such as resin
1 is provided. Due to the resin flange JF1 having a large coefficient of thermal expansion provided at the outer (outer peripheral surface) end of the light-transmitting substrate 171a, the light-transmitting substrate 171a mainly using a glass member is damaged by thermal expansion during heating. Is prevented. A resin flange JF1 as a holding member is fitted into a hot-wire fixing roller bearing B5, which is a bearing member press-fitted into the bearing holder BH1, and
7a is held rotatably. At this time, without providing the resin flange JF1 as the holding member, the heat ray fixing roller bearing B5 as the bearing member is directly connected to the translucent base 171.
The light-transmitting base 171a of the heat ray fixing roller 17a may be configured to be fitted to the end of the heat-ray fixing roller 17a. Further, a resin flange JF1 as a holding member is formed so as to cover the end of the translucent substrate 171a as shown by a dashed line in FIG. 7 so as to prevent the heat ray fixing roller 17a from shifting in the axial direction. You may.

Further, the core metal 471a and the rubber roller layer 471
b and the lower pressure roller 47a formed by the heat-resistant fluororesin tube 471c,
While being pressed against the upper heat ray fixing roller 17a, the core metal 471a is fitted into the bearing B6 which is pressed into the bearing holder BH2, and is held rotatably. The pressure roller 47a is driven and rotated by the driving of a gear Ga provided at one end of the core metal 471a of the pressure roller 47a, and the heat ray fixing roller 17a is driven to rotate.

A resin flange JF1 as a holding member and / or a heat ray fixing roller bearing B as a bearing member
5, in which the ends of the translucent base 171a of the heat ray fixing roller 17a are held, the resin flange JF1 and / or the heat ray fixing roller bearing B5 prevent the end of the translucent base 171a from being damaged. Optical substrate 1
It is preferable that the distance L1 (mm) between the holding center positions of 71a is set to L1 / L = 0.70 to 0.98 with respect to the length L (mm) of the translucent substrate 171a. The distance L1 between the holding center positions of the transparent substrate 171a and the length L of the transparent substrate 171a
When L1 is short and is less than 0.70, the ratio L1 / L contributes to the prevention of cracking (breakage), but the portion not contributing to the fixing at both ends becomes long, and the apparatus becomes large. .
If the ratio L1 / L is greater than 0.98, the resin flange JF1 and / or the heat ray fixing roller bearing B
5, the holding position of the light-transmitting substrate 171a is set at the end of the light-transmitting substrate 171a, and the effect of preventing cracking (breakage) is lost.

The above setting prevents breakage at the end of the light-transmitting substrate 171a mainly using a glass member. The length L2 (mm) of the pressing roller 47a is set to be equal to the resin flange JF1 and / or the heat ray fixing roller bearing B5 in order to prevent damage at the end of the translucent substrate 171a.
L1 between the holding center positions of the light transmitting substrate 171a due to the
It is preferable to set L2 / L1 = 0.80 to 0.95 with respect to (mm). Length L of pressure roller 47a
2 and the distance L1 between the holding center positions of the light-transmitting base 171a
If the ratio L2 / L1 is less than 0.80 and is small, the load on the heat ray fixing roller 17a by the pressure roller 47a is too close to the center of the heat ray fixing roller 17a, and
1a may be damaged. Also, the width of the pressure roller 47a is regulated. If the ratio L2 / L1 is greater than 0.95, the mounting margin for the pressure roller 47a is eliminated. When the size of the transfer material is up to A-3 vertical feed size width (297 m
m), the length L of the translucent substrate 171a is 310
~ 420mm, length L2 of the pressure roller 47a is 297 ~
Preferably, the length L is set to 350 mm, and when the size of the transfer material corresponds to the A-4 vertical feed size width (210 mm) at the maximum, the length L of the light-transmitting substrate 171a is 220 to 35.
0 mm, the length L2 of the pressure roller 47a is 210 to 260
mm.

The above setting prevents breakage at the end of the light-transmitting substrate 171a mainly using a glass member. FIG. 8 shows a supporting method for preventing breakage at the end of the translucent substrate 171a. The heat ray fixing roller 17a, which is a rotating member for fixing the heat ray of the fixing device 17, is provided with the translucent substrate 171a.
And a light-transmitting elastic layer 171d, a heat ray absorbing layer 171b, and a release layer 171c provided in that order on the outside (outer peripheral surface) of the cylindrical light-transmitting substrate 1 using a glass member.
In parallel with the central axis of the light-transmissive substrate 71a, at both ends of the outer peripheral surface of the light-transmissive substrate 171a, for example, a heat-resistant polyimide resin or polyphenylene sulfide resin as a holding member for the light-transmissive substrate 171a provided on the heat ray fixing roller 17a. (PP
Resin flange JF1 using a resin member such as
It penetrates through the translucent base 171a (is inserted into the center while leaving (leaving) both ends of the translucent base 171a), and is disposed at both ends of the translucent base 171a. Translucent substrate 171
The resin flange JF1 having a large coefficient of thermal expansion provided at the outer (outer peripheral surface) end of the substrate a prevents damage to the light-transmitting substrate 171a due to thermal expansion during heating of the light-transmitting substrate 171a mainly using a glass member. . Bearing holder BH
A resin flange JF1 as a holding member is fitted into a heat ray fixing roller bearing B5, which is a bearing member press-fitted into 1, so that the heat ray fixing roller 17a is rotatably held.
At this time, without providing the resin flange JF1 as a holding member, a heat ray fixing roller bearing B5 as a bearing member is provided.
May be directly fitted to the end of the translucent substrate 171a to hold the translucent substrate 171a of the heat ray fixing roller 17a.

The pressure roller 4 on the lower side of the fixing device 17
7a is formed of a core metal 471a, a rubber roller layer 471b, and a tube 471c made of a heat-resistant fluororesin or the like. As a support member for the light-transmitting substrate 171a, the both ends of the core metal 471a are coaxial with the pressure roller 47a. A state in which the light-transmissive substrate 171a is pressure-bonded at both ends by the abutting roller TR as a support member for the light-transmissive substrate 171a, and the light-transmissive substrate 171a is supported from the pressure roller 47a side. Then, the pressure roller 47a is pressed against the upper heat ray fixing roller 17a, the core metal 471a is fitted into the bearing B6 which is pressed into the bearing holder BH2, and the pressure roller 47a is rotatably held. Butt roller TR
Is formed as an elastic roller having a rubber layer GM formed outside (outer peripheral surface) of the bearing holder BH3 provided with the bearing B7. The outer diameter of the abutting roller TR is set to be equal to or smaller than the light-transmitting elastic layer 171d as the heat ray fixing rotating member.
The outer diameter of the light-transmitting elastic layer 171 is equal to or slightly larger than the outer diameter of the pressure roller 47a.
When the light-transmitting elastic layer 171d is not provided, the pressure roller 47
Using the same or slightly smaller outer diameter of a
The translucent substrate 171a is supported, and the width of the nip portion N is secured. The pressure roller 47a is driven and rotated by the driving of a gear Ga provided at one end of the core metal 471a of the pressure roller 47a, and the heat ray fixing roller 17a is driven to rotate.

By the above-described method of supporting the light-transmitting substrate 171a at the end using the supporting member, the entire area of the light-transmitting substrate 171a mainly using a glass member can be pressed almost uniformly, and therefore, particularly, Breakage at the ends is prevented. In addition, as another example of a supporting method at the end of the light-transmitting base 171a, as shown in FIG. 9, a resin flange JF1 as a holding member and / or a heat ray fixing roller bearing B5 as a bearing member may be used. Concave portions LS are provided at both end portions of the pressure roller 47a, and the end portions of the light-transmissive base 171a of the heat ray fixing roller 17a are received by the most protruding portions TS on both sides of the pressure roller 47a, and the light is transmitted by the pressure roller 47a. The support 171a may be supported. When the translucent elastic layer 171d is provided as a heat ray fixing rotating member, the outer diameter of the convex portion TS on both side ends of the pressure roller 47a is equal to or slightly larger than the outer diameter of the central portion of the pressure roller 47a. When the light-transmitting elastic layer 171d is provided with a thickness smaller than the thickness of the light-transmitting elastic layer 171d to the outer diameter of the central portion of the pressing roller 47a, and when the light-transmitting elastic layer 171d is not provided, The light-transmitting base 171a is supported by using the same outer diameter or slightly smaller than the outer diameter of the portion, and the width of the nip portion N is secured.

As described above, the convex portions TS are provided on both side ends of the pressure roller 47a to support the translucent substrate 171a.
Since the entire region a can be pressed almost uniformly, breakage, particularly at the ends, is prevented.

[0056]

According to the present invention, breakage at the end of the light-transmitting substrate mainly using a glass member is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a color image forming apparatus showing an embodiment of an image forming apparatus using a fixing device according to the present invention.

FIG. 2 is a side sectional view of the image forming body of FIG. 1;

FIG. 3 is an explanatory diagram illustrating a structure of a fixing device.

FIG. 4 is an enlarged cross-sectional configuration diagram of the roll-shaped rotating member for heat ray fixing in FIG. 3;

FIG. 5 is a diagram showing a concentration distribution of a heat ray absorbing layer of the roll-shaped heat ray fixing rotating member of FIG. 3;

6 is a view showing the outer diameter and thickness of a light-transmitting substrate of the roll-shaped heat ray fixing rotating member of FIG. 3;

FIG. 7 is an explanatory view of a position of a holding member and / or a bearing member for preventing breakage at an end portion of the light-transmitting substrate, a rule of a pressure roller position, and the like.

FIG. 8 is a view showing an example of a supporting method for preventing breakage at an end of a light-transmitting substrate.

FIG. 9 is a view showing another example of a supporting method for preventing breakage at an end of the light-transmitting substrate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 photoconductor drum 11 scorotron charger 12 exposure optical system 13 developing device 17 fixing device 17a heat ray fixing roller 47a pressure roller 171a translucent substrate 171B combined layer 171b heat ray absorbing layer 171c release layer 171d translucent elastic layer 171g halogen lamp B5 Heat ray fixing roller bearing JF1 Resin flange LS Concave part P Recording paper TR Abutment roller TS Convex part

Claims (5)

[Claims] 1. A fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein, and has a light transmitting property with respect to the heat rays. A cylindrical light-transmitting substrate, and a heat-ray absorbing layer that absorbs the heat rays are provided outside the light-transmitting substrate to form a roll-shaped rotating member for fixing heat rays, and both ends of the light-transmitting substrate are formed. While being held by a holding member and / or a bearing member, an interval L1 (mm) between holding center positions of the light-transmitting substrate by the holding member and / or the bearing member is a length L (mm) of the light-transmitting substrate. ), Wherein L1 / L = 0.70 to 0.98. 2. A fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein, and has a light transmitting property to the heat rays. A cylindrical light-transmitting substrate, and a heat-ray absorbing layer that absorbs the heat rays are provided outside the light-transmitting substrate to form a roll-shaped heat ray fixing rotating member, which faces the heat ray fixing rotating member. A pressure roller is provided to hold both ends of the translucent base with a holding member and / or a bearing member, and the length L2 (mm) of the pressure roller is adjusted by the holding member and / or the bearing member. A fixing device, wherein L2 / L1 = 0.80 to 0.95 with respect to the distance L1 (mm) between the holding center positions of the optical substrate. 3. A fixing device for fixing a toner image on a transfer material to the transfer material by heating and pressurizing, wherein the fixing device has a heat ray irradiating means for emitting heat rays therein, and has a light transmitting property to the heat rays. A cylindrical light-transmitting substrate, and a heat-ray absorbing layer that absorbs the heat rays are provided outside the light-transmitting substrate to form a roll-shaped heat ray fixing rotating member, which faces the heat ray fixing rotating member. And a holding member and / or a bearing member are provided at both ends of the light-transmitting substrate, and the light-transmitting substrate is supported from the pressure roller side. A fixing device. 4. The fixing device according to claim 3, wherein the translucent substrate is supported by support members provided coaxially with the pressure roller at both ends of the pressure roller. 5. The fixing device according to claim 3, wherein concave portions are formed at both ends of the pressure roller, and the translucent base is supported by convex portions outside the concave portions.