JP2000227732A - Fixation device and picture forming device - Google Patents

Fixation device and picture forming device

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Publication number
JP2000227732A
JP2000227732A JP11029358A JP2935899A JP2000227732A JP 2000227732 A JP2000227732 A JP 2000227732A JP 11029358 A JP11029358 A JP 11029358A JP 2935899 A JP2935899 A JP 2935899A JP 2000227732 A JP2000227732 A JP 2000227732A
Authority
JP
Japan
Prior art keywords
fixing
heating
unit
image forming
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11029358A
Other languages
Japanese (ja)
Inventor
Junichi Kimizuka
Riichi Tsuchiya
純一 君塚
利一 土谷
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP11029358A priority Critical patent/JP2000227732A/en
Publication of JP2000227732A publication Critical patent/JP2000227732A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] To accurately detect the temperature of a heating / fixing unit even when the heating / fixing unit having a different emissivity is mounted, and to detect the temperature of the heating / fixing unit in the longitudinal direction. Temperature fluctuations, contamination of the temperature detecting means by paper dust, etc., and temperature rise of the temperature detecting means itself due to convection heat can be prevented. Therefore, by performing accurate temperature detection, good fixing property can be obtained, and the heat fixing means can be obtained. The present invention provides a fixing device and an image forming apparatus which do not adversely affect the operation of the fixing device. A fixing device and an image forming apparatus include a heating fixing unit having heating units, and an emissivity indicating unit (8a to 8c) that indicates an emissivity signal corresponding to an infrared emissivity of the heating fixing unit. ), Temperature detecting means 75 for detecting the temperature of the heat fixing means 71, and emissivity recognizing means 8a 'for recognizing the emissivity signal indicated by the emissivity indicating means.
8c ', and means for correcting the temperature of the heating and fixing means 71 detected by the temperature detecting means 75 in accordance with the emissivity signal in accordance with the infrared emissivity of the heating and fixing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing an unfixed toner image formed on a recording material using, for example, an electrophotographic method or an electrostatic recording method on the recording material using a fixing device. The present invention relates to an image forming apparatus for obtaining an image, such as a copying machine or a laser beam printer, and a fixing device and a fixing unit used in the image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, for example, an image forming apparatus using an electrophotographic system is widely used due to its quietness, for example, represented by a copying machine and a laser beam printer.

FIG. 11 shows a schematic configuration of a laser beam printer (hereinafter, simply referred to as "printer") as an example of a conventional electrophotographic image forming apparatus.

The printer shown in FIG. 11 has a drum-shaped electrophotographic photosensitive member (hereinafter, referred to as a rotatable member) rotatable in the direction of an arrow at the approximate center.
Called "photosensitive drum". The surface of the photosensitive drum 1 is uniformly charged by the primary charger 2 after the surface of the photosensitive drum 1 is neutralized by the pre-exposure lamp 5. Thereafter, the surface of the photosensitive drum 1 is exposed by a laser scanner unit 11 as exposure means in accordance with image information, and an electrostatic latent image is formed on the surface.

[0005] Here, the laser scanner section 11 includes a laser unit 11a for emitting a laser beam L, and a laser beam L from the laser unit 11a.
It comprises a polygon motor 11b for scanning upward, an imaging lens group 11c, a return mirror 11d, and the like.

[0006] Next, the electrostatic latent image formed on the photosensitive drum 1 is visualized by a developer (including toner) contained in the developing device 3, and a toner image is formed on the photosensitive drum 1.

On the other hand, the recording material P sent out from the cassette 13 containing the recording material P by the recording material supply roller 14 is used.
Is transported to a pair of registration rollers 16 for transporting the recording material P in synchronization with the image forming operation. Then, the photosensitive drum 1 is moved to a transfer position where the photosensitive drum 1 and the transfer roller 6 as a transfer unit face each other. The registration roller pair 16 conveys the recording material P to the transfer position in synchronization with the arrival of the toner image formed thereon.

Thus, the toner image on the photosensitive drum 1 is
The image is electrostatically transferred onto the recording material P by the transfer roller 6. The recording material P carrying the unfixed toner image by transfer is
The toner image is conveyed to the fixing device 7 and the unfixed toner image is permanently fixed on the recording material P by heat and pressure.

Thereafter, the recording material P passes through a fixing paper discharge sensor 17 for detecting the passage of the recording material P, and is then discharged to the outside of the printer by conveyance rollers 18 for nipping and conveying the recording material P.
The sheet is stacked on the stacking tray 21 at the top of the printer. Further, the toner remaining on the surface of the photosensitive drum 1 after the transfer is completed,
The transfer residual toner is removed by the cleaner blade 4, and the photosensitive drum 1 is continuously used for image formation.

Heretofore, conventionally, for example, the photosensitive drum 1, the developing device 3, the primary charger 2, the cleaner blade 4, and the pre-exposure lamp 5 are integrally formed into a cartridge by a frame, and are detachably mountable to a printer main body. There is a type that is regarded as a simple process cartridge.

The printer shown in FIG. 11 includes a double-sided unit 19 for forming images on both sides of the recording material P, and switches the recording material P on which a permanent image is formed on the first surface to a switchback unit 20. Then, the recording material is conveyed again to the registration roller 16 by a reversing roller 19b that can be rotated forward and backward and a conveying roller group 19a that nips and conveys the recording material, and is used for image formation on the second surface.

Next, the conventional fixing device 7 will be described.

The fixing device 7 includes a heating roller 71 serving as a heating / fixing unit, a halogen heater 73 serving as a heating unit for heating the heating roller 71, a pressing roller 72 serving as a pressing / fixing unit pressed against the heating roller 71, And as temperature detecting means for detecting the temperature of the heating roller 71,
For example, it has a temperature sensing element 70 such as a thermistor. Conventionally, for example, a heating roller 71, a pressure roller 7
2. There is known a fixing unit U in which the temperature sensing element 70 is integrally unitized and can be easily attached to and detached from the image forming apparatus main body, and is electrically connected to the printer main body by the connector 10. .

The halogen heater 73 provided inside the heating roller 71 heats the inner peripheral surface of the heating roller 71, and this heat is transmitted to the front side of the heating roller 71 by the heat conduction of the heating roller 71 itself. Further, a temperature sensing element 70 such as a thermistor contacting the surface of the heating roller 71 detects the temperature.
In accordance with the surface temperature of the heating roller 71, a temperature adjustment circuit (not shown) controls the energization of the halogen heater 73, and automatically adjusts the surface temperature of the heating roller 71 to a desired fixing temperature.

Conventionally, as disclosed in, for example, JP-A-7-295435, an infrared temperature sensor (hereinafter simply referred to as an "infrared sensor") is used as a temperature detecting means.
A non-contact temperature sensor such as a magnetic temperature detection element is moved in the longitudinal direction of the heating roller 71, that is, in a direction orthogonal to the conveying direction of the recording material P, to detect the temperature, and based on the detection result, the temperature of the heating roller 71 is detected. One that performs control has been proposed.

FIG. 12 shows a schematic configuration of an example of a conventional fixing device 7. As shown in FIG. 12, a pressure roller 72 abuts on a heating roller 71 having a halogen heater 73 therein, and the surface temperature of the heating roller 71 is controlled by an infrared sensor 75 moving in the longitudinal direction of the heating roller 71. The lighting time of the halogen heater 73 is controlled such that the lowest temperature detected by the sensor becomes a predetermined desired temperature.

Conventionally, an element called a so-called pyroelectric infrared sensor has been developed as the infrared sensor 75, which is characterized by its small size and high-speed response. FIG. 1 shows an example of a conventional infrared sensor input circuit 94 of a fixing device 7 for controlling the temperature of a heating roller 71 using a pyroelectric infrared sensor.
3 is shown.

As shown in FIG. 13, the infrared sensor input circuit 94 includes a pyroelectric infrared sensor 75 for detecting the temperature of the heating roller 75, and a temperature compensating diode for detecting the temperature of the pyroelectric infrared sensor 75. 120, operational amplifiers 101 to 108, variable resistors 111 to 115, and other analog circuits including a capacitor group, a resistor group, and the like.

The temperature detection output of the pyroelectric infrared sensor 75 is amplified by the operational amplifier 101, and noise is removed by the operational amplifier 102 and its peripheral circuits.
Full-wave rectification is performed by a full-wave rectifier circuit 104 and its peripheral circuits, peak-held by the operational amplifier 105 and its peripheral circuits, amplified by the operational amplifier 106 and its peripheral circuits, and operated by the operational amplifier 107. A signal obtained by amplifying the temperature detection output of the temperature compensating diode 120 composed of the amplifier 108 and its peripheral circuit is mixed to perform temperature compensation for a change in environmental temperature.

The related art is disclosed in Japanese Patent Application Laid-Open No. 7-77892.

[0021]

However, in a conventional image forming apparatus that detects the temperature of the heating roller 71 using the infrared sensor 75, the infrared emissivity (hereinafter, simply referred to as "emissivity") is different. For example, when a fixing unit U having a heating roller 71 or the like having a different color or material is mounted, the temperature detected by the infrared sensor becomes a value different from the actual temperature, and the temperature cannot be controlled to a predetermined temperature. there were.

That is, the infrared sensor 75 detects different values depending on the emissivity even when the object to be measured has the same temperature.
However, in the conventional image forming apparatus, since the emissivity of the object to be measured is treated as a fixed value, when the fixing unit U having the heating roller 71 having a different color or material is mounted on the image forming apparatus, the heating roller 71 Is different from the actual temperature.

The inability to accurately detect the temperature of the heating roller 71 as described above not only does not provide good fixing properties, but also results in failure of the fixing device such as the heating roller 71.

Further, the conventional image forming apparatus has the following problems.

That is, in the image forming apparatus corresponding to the recording material P of a large size, the entire heating roller 71 is uniformly heated by one, for example, the halogen heater 73. However, when an image is formed on a small-sized recording material P in such a conventional image forming apparatus, the heat of the heating roller 71 in the pass area of the recording material P is taken by the recording material P, and
Of the heating roller 71 and the fixing device 7, or the fixing property is deteriorated.
As described above, conventionally, the heating roller 71 is
In this case, there is a problem that the temperature of the central portion and the end portion of the heating roller 71 in the longitudinal direction varies, and that an appropriate fixing property cannot be obtained.

Further, in the conventional fixing device 7 and image forming apparatus in which the temperature of the surface of the heating roller 71 is detected by using the infrared sensor 75, the detection portion of the infrared sensor 75 is stained by paper dust or the like, and the detection accuracy is reduced. There was a problem. In addition, there is a problem that the infrared sensor 75 itself receives heat from the outside, and the detection accuracy is reduced.

Heretofore, a fixing device 7 in which a fixing film is disposed so as to be in sliding contact with a heater is known. However, the above-mentioned problems are caused by the fixing device 7 using such a fixing film and the image forming method. This also occurred in the apparatus.

Accordingly, an object of the present invention is to enable accurate detection of the temperature of the heat fixing means even when the heat fixing means having different emissivities are mounted, and thus good fixing properties can be obtained. An object of the present invention is to provide a fixing device and an image forming apparatus that do not adversely affect a heat fixing unit or the like that causes a failure.

Another object of the present invention is to prevent a variation in temperature in the longitudinal direction of the heating and fixing means and the like, so that good fixing properties can be obtained, and the heating and fixing means and the like are adversely affected to cause failure. It is an object of the present invention to provide a fixing device and an image forming apparatus.

Another object of the present invention is to enable accurate temperature detection even when the temperature detecting means is contaminated by paper dust or the like. It is an object of the present invention to provide a fixing device and an image forming apparatus which can obtain heat-fixing means and do not adversely affect a heat-fixing unit or the like.

Still another object of the present invention is to prevent contamination of the temperature detecting means by paper dust and the like, and to prevent the temperature of the temperature detecting means itself from rising due to convection heat from the heating and fixing means. An object of the present invention is to provide a fixing device and an image forming apparatus which can obtain a good fixing property by performing detection and do not adversely affect a heat fixing unit or the like which causes a failure.

[0032]

The above object is achieved by a fixing device and an image forming apparatus according to the present invention. In summary, the present invention relates to a fixing device and an image forming apparatus for permanently fixing an unfixed toner image formed on a recording material on the recording material, wherein the heating and fixing device includes a heating device; Emissivity indicating means for indicating an emissivity signal corresponding to the emissivity; temperature detecting means for detecting the temperature of the heating and fixing means; emissivity recognition for recognizing the emissivity signal indicated by the emissivity indicating means Means for correcting the temperature of the heating and fixing means detected by the temperature detecting means in accordance with the emissivity signal according to the infrared emissivity of the heating and fixing means; and An image forming apparatus.

According to another aspect of the present invention, there is provided a fixing device and an image forming apparatus for permanently fixing an unfixed toner image formed on a recording material on the recording material. A plurality of heating means having different distributions of heating areas in a direction orthogonal to the recording material conveying direction of the heating and fixing means; a temperature detecting means for detecting a temperature of the heating and fixing means; Means for controlling heating of the heating and fixing means by the plurality of heating means in accordance with a temperature distribution of the heating and fixing means in a direction orthogonal to the recording material conveyance direction. An apparatus is provided.

According to another aspect of the present invention, there is provided a fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, wherein the fixing device includes a heat fixing unit; A means for moving the temperature detecting means in a direction perpendicular to the recording material conveying direction of the heating and fixing means; and an outside of an area where the temperature detecting means and the heating and fixing means face each other. A cleaning unit provided on an extension of the moving direction of the temperature detecting unit for cleaning the temperature detecting unit; and a fixing device and an image forming apparatus.

According to another aspect of the present invention, there is provided a fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, wherein the fixing device includes a heat fixing unit; A temperature detecting means, and a cover means located between the temperature detecting means and the heating and fixing means for transmitting infrared rays and blocking convective heat. Provided.

According to one embodiment of the present invention, at least the heat fixing means and the emissivity indicating means are unitized to constitute a fixing unit detachable from the fixing device. According to another embodiment, the emissivity indicating means is a jumper wire, and the emissivity recognition means is an electric contact connectable to the jumper wire. According to another embodiment, the emissivity indicating means is a nonvolatile memory element, and the emissivity recognizing means is an electric contact connectable to the nonvolatile memory element. According to another embodiment, the emissivity indicating means is a reflector, and the emissivity recognition means is a reflection type photo interrupter. According to another embodiment, the emissivity indicating means is a reflector, and the emissivity recognition means is a transmissive photointerrupter.

According to another embodiment of the present invention, there is further provided a means for moving the temperature detecting means in a direction perpendicular to the recording material conveying direction of the heating and fixing means.

According to another embodiment of the present invention, the heating means is a plurality of heating means having different heating area distributions in a direction orthogonal to the recording material conveying direction of the heating and fixing means. According to one embodiment, the heating unit is a plurality of halogen heaters having different light distributions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit.

According to another embodiment of the present invention, heating of the heating and fixing unit by the plurality of heating units is controlled in accordance with a temperature distribution of the heating and fixing unit in a direction orthogonal to the recording material conveying direction. Means for controlling the heating of the heating and fixing unit by the plurality of heating units in accordance with a temperature distribution of the heating and fixing unit in a direction orthogonal to the recording material conveying direction.

According to another embodiment of the present invention, the temperature detecting means is located outside the area where the temperature detecting means and the heat fixing means face each other and on an extension of the moving direction of the temperature detecting means. Cleaning means for cleaning the
Preferably, the cleaning means is a felt.

According to another embodiment of the present invention, there is further provided a cover unit which is located between the temperature detecting unit and the heating and fixing unit, transmits infrared rays and blocks convective heat.
Preferably, said cover means is made of an infrared transmitting material. According to another embodiment, the cover means has an infrared detection window made of an infrared transmitting material, and according to another embodiment, the cover means has an infrared detection window made of a Fresnel lens.

According to the preferred embodiment of the present invention,
The heating and fixing unit is a rotating body, and according to one embodiment, the heating and fixing unit, which is the rotating body, has a roller shape.

Further, according to another embodiment of the present invention, a plurality of the temperature detecting means are provided in a direction orthogonal to the recording material conveying direction of the heat fixing means. According to a preferred embodiment of the present invention, the temperature detecting means is an infrared temperature sensor which is not in contact with the heat fixing means.

[0044]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fixing device and an image forming apparatus according to the present invention will be described in more detail with reference to the drawings.

Embodiment 1 FIG. 1 shows a schematic configuration of an embodiment of an image forming apparatus according to the present invention. According to the present embodiment, the present invention is embodied in an electrophotographic laser beam printer (printer), but is not limited thereto. For example, using an electrophotographic system or an electrostatic recording system An arbitrary image forming apparatus including a step of forming a latent image on an image carrier, visualizing the latent image using a developer (including toner) to form a toner image, and then fixing an unfixed toner image; It is adaptable to.

The outline of the operation of the printer shown in FIG. 1 is as follows.

That is, according to the present embodiment, in the image forming apparatus, the surface of a drum-shaped electrophotographic photosensitive member as an image carrier, that is, a so-called photosensitive drum 1, which is rotatable in the direction of an arrow, is discharged by a pre-exposure lamp 5. After that, the surface is uniformly charged by the primary charger 2, and the surface is exposed to a laser scanner unit 11 as an exposure unit.
Performs an exposure L corresponding to the image information, and an electrostatic latent image is formed on the surface. Next, the developing device 3 visualizes the electrostatic latent image on the photosensitive drum 1 with a developer (including toner), so that a toner image is formed on the photosensitive drum 1.

On the other hand, the recording material P stored in the cassette 13
Is transferred by the recording material supply roller 14 and conveyed to the transfer position by the registration roller 16 in synchronization with the transfer of the toner image on the photosensitive drum 1 to the transfer position where the transfer roller 6 and the photosensitive drum 1 are opposed to each other. You.

In this way, the toner image on the photosensitive drum 1 is electrostatically transferred onto the recording material P. Thereafter, the recording material P carrying the unfixed toner image is conveyed to the fixing device 7, where it is heated and pressured. The unfixed toner image is permanently fixed on the recording material P.

After the transfer is completed, the transfer residual toner remaining on the surface of the photosensitive drum 1 is removed by the cleaner blade 4 so that the image forming operation can be repeatedly performed. The recording material P on which the permanent image is formed is discharged out of the printer,
The sheets are stacked on the stacking tray 21.

In this embodiment, the photosensitive drum 1, the primary charger 2, the developing unit 3, the cleaner blade 4, and the pre-exposure lamp 5 are integrally formed into a cartridge by a frame, and can be attached to and detached from the printer main body. Process cartridge.

Next, the fixing device 7 of this embodiment will be described.

FIG. 2 shows a schematic configuration of an embodiment of the fixing device 7 according to the present invention.

As shown in FIG. 2, a main halogen heater 73a and a sub-halogen heater 73b as heating means are provided inside a heating roller 71 as a heating and fixing means which is a rotating body. Is pressed against a pressure roller 72 as a pressure fixing means. The main halogen heater 73a and the sub-halogen heater 73b have different heating area distributions in the longitudinal direction of the heating roller 71, that is, in the direction orthogonal to the conveying direction of the recording material P. As will be understood, the heating roller 71
The central area of the main halogen heater 73
a is heated, and the sub-halogen heater 73 b heats both end regions of the heating roller 71 in the longitudinal direction.

An infrared sensor 75 is provided at a distance from the surface of the heating roller 71. The infrared sensor 75 is supported by a guide shaft 76 and a drive shaft 77 via a pair of cylinders 78 (78a and 78b). In this embodiment, a pyroelectric infrared sensor is used as the infrared sensor.

A screw is formed on the drive shaft 77, and one end of the screw in the longitudinal direction is connected to a stepping motor 74 that can rotate forward and reverse. Drive shaft 77
The cylinder 78 having a groove in the inside that engages with the screw of the drive shaft 77 by forward and reverse rotation.
b and the infrared sensor 7 supported by the cylinder 78b
5 can be moved in the longitudinal direction of the heating roller 71 (the direction of the arrow in the figure). The means for moving the infrared sensor 75 in the longitudinal direction of the heating roller 71 is not limited to the above.

Further, the image forming apparatus of this embodiment has a cleaning means 79a for cleaning the infrared sensor 75, which is located outside the longitudinal length region of the heating roller 71.
The infrared sensor 75 moving within the longitudinal length region of the heating roller 71 moves to the position of the cleaning means 79a when a predetermined condition is satisfied, and the infrared sensor 7
For example, paper dust and the like adhering to 5 are removed.

The cleaning means is not limited, but a felt, a brush or the like can be used.
It is felt.

According to this embodiment, the guide shaft 7
6, drive shaft 77, felt 79a, stepping motor 74, cylinder pair 78 (78a, 78
b), the infrared sensor 75 and the pressure roller 72 are provided in the main body of the image forming apparatus, and the heating roller 71 having the main halogen heater 73a and the sub-halogen heater 73b is unitized and detachable from the main body of the image forming apparatus. The fixing unit U is set.

In this embodiment, the heating and fixing means having a built-in heating means is used as the fixing unit U and is detachable from the fixing device and the image forming apparatus. However, the present invention is not limited to this. Alternatively, for example, the pressure fixing unit may be integrally unitized to form a fixing unit U detachable from the fixing device and the image forming apparatus.

Next, the detection of the temperature of the heating roller 71 according to the present invention will be described in more detail. FIG. 3 shows a temperature detection position of the heating roller 71 by the infrared sensor 75 of the present embodiment. FIG. 4 shows a flow of detecting the temperature of the heating roller 75.

In the present embodiment, as shown in FIG. 3, the temperature of each of the points A, B and C of the heating roller 71 is detected.
Point A is a heated portion of the sub-halogen heater 73b, point B is a boundary between the heated portions of the main halogen heater and the sub-halogen heater (substantially, an overlapping region of both heated portions), and point C is a heated portion of the main halogen heater. Corresponding.

As will be understood with reference also to FIG.
In detecting the temperature of the heating roller 71, first, the infrared sensor 75 is moved to detect the temperatures at the points A to C (step 1). It is determined whether or not the point B is lower than the set temperature (step 2). If the point B is lower than the set temperature, both the main and sub halogen heaters 73a and 73b are turned on (step 3). Steps 1 to 3 are repeated until the point temperature reaches the set temperature. Thus, B
When the temperature at the point reaches the set temperature, both the main and sub halogen heaters 73a and 73b are turned off (step 4).

Next, it is determined whether or not the point C is lower than the set temperature (step 5). If the temperature at the point C is lower than the set temperature, the main halogen heater 73a is turned on (step 6). Is higher than the set temperature, the main halogen heater 73a is turned off (step 7). Next, A
It is determined whether the point is lower than the set temperature (step 8). If the temperature at the point A is lower than the set temperature, the auxiliary halogen heater 73b is turned on (step 9), and the temperature at the point A is higher than the set temperature. In this case, the sub-halogen heater 73b is turned off (step 10). By repeating the above steps 1 to 10, the temperature of the heating roller 71 is controlled.

Next, the detection of the temperature of the heating roller 71 according to the present invention will be further described. FIG. 5 shows an outline of temperature control of the heating roller 71 according to the present invention.

As will be described in detail later, the fixing device 7 of the present embodiment has an emissivity detecting device 8 for detecting the emissivity of the surface to be detected whose temperature is detected by the infrared sensor 75. As understood from FIG. 5, the detection signal of the infrared sensor 75 is input to the infrared sensor input circuit 94, processed, and then processed as a one-chip microcomputer (hereinafter referred to as “CPU”). .) Sent to 91.

On the other hand, a signal indicating the emissivity of the temperature detection surface of the heating roller 71 (hereinafter referred to as “emissivity signal”) is input from the emissivity detecting device 8 to the CPU 91, and the emissivity signal indicates. To match the emissivity of the heating roller 71,
The temperature data input from the infrared sensor input circuit 94 to the CPU 91 is corrected. Thus, an accurate temperature corresponding to the emissivity of the heating roller 71 is detected.

Here, the emissivity signal indicates the emissivity in an electric or optical signal, and the CPU 91 converts the input emissivity signal into a predetermined emissivity signal and an emissivity signal. The emissivity of the heating roller 71 of the fixing unit U currently mounted on the fixing device 7 can be known by collating with the correspondence table with the ratio.

As described above, the CPU 91 controls the heating roller 71
When the temperature of a certain point (one of A to C) is detected, a command is sent to the driver 133 of the stepping motor 74 to move the infrared sensor 75, and the driver 133 starts driving the stepping motor 74. Let it. In this way, the CPU corrects the temperature detected at the position where the infrared sensor 75 has moved in the same manner as described above, and detects an accurate temperature.

As described above, according to the flow of FIG. 4 described above, the movement of the infrared sensor 75, the detection of the temperature, and the accurate temperature detection by the correction are repeated, and the CPU 91 which grasps the temperature distribution in the longitudinal direction of the heating roller 71 is obtained. Determines whether to turn on the main halogen heater 73a and the sub halogen heater 73b, and sends a command to the drivers 131 and 132 of the main halogen heater 73a and the sub halogen heater 73b, respectively.

Next, the emissivity detecting device 8 according to the present invention will be described. FIG. 6 schematically shows an embodiment of the entire circuit configuration of the fixing device according to the present invention. For simplicity,
In FIG. 6, the auxiliary halogen heater 73b is omitted.

According to this embodiment, the fixing unit U is provided with the jumper wire 8 as the emissivity indicating means of the emissivity detecting device 8.
a, and is detachably attached to the image forming apparatus main body G to form the fixing device 7. Fixing unit U
And the image forming apparatus main body G are electrically connected by the connector 10 to supply electric power to the heater of the heating roller 71.

Further, an electrical contact 8a 'is provided on the image forming apparatus main body G side as emissivity recognition means of the emissivity detecting device 8, and as described later, whether or not there is connection with the jumper wire 8a. The electric signal as the emissivity signal is represented by C
Send to PU91. The temperature detection signal from the infrared sensor 75 is sent to the CPU 9 via the infrared sensor input circuit 94.
1 is input to the analog input port 92. Also, CP
Based on the digital signal from the digital input / output port 93 of U91, the power supply control circuit 95 controls the power supply from the commercial power supply E to the heaters 73a and 73b of the heating roller 71. Further, as shown in FIG. 6, the image forming apparatus main body G includes:
A pull-up resistor 96 is provided.

The emissivity detector 8 of this embodiment operates as follows.

That is, for example, when a fixing unit U having two types of heating rollers 71 having different emissivities can be mounted on the image forming apparatus main body G, one of the fixing units U has a jumper as emissivity indicating means 8 as emissivity indicating means 8. The line 8a is provided, and the other fixing unit U is not provided with a jumper line.

Fixing unit U having jumper wire 8a
Is mounted on the image forming apparatus main body G, the electrical contact 8a 'as the emissivity recognition means and the jumper wire 8a as the emissivity indicating means are connected, and the digital input port 93 pulled up is connected. , LOW (low) level. Conversely, when the fixing unit U having no jumper wire 8a is connected to the fixing device 7, the digital input port 93
Becomes a HIGH (high) level. Digital input port 9
By storing the emissivity corresponding to the state 3 in the CPU 91 in advance, the CPU 91 can detect the emissivity of the mounted heating roller 71. In this specification, the emissivity indicating device, the emissivity recognizing device, and other circuits related thereto are referred to as an emissivity detecting device 8.

On the other hand, the temperature detection signal of the infrared sensor 75 is input to the infrared sensor input circuit 94 and processed, and then sent to the analog input port 92 of the CPU 91 to correspond to the state of the digital input port 93 as described above. Then C
The correction is made according to the emissivity of the heating roller 71 detected by the PU 91, and the actual temperature of the actual heating roller 71 is detected. Incidentally, as the infrared input circuit 94 of this embodiment, the above-described conventional circuit shown in FIG. 13 can be used.

In this manner, an accurate temperature corresponding to the emissivity of the heating roller 71 is detected, and the energization of the heaters 73a and 73b of the heating roller 71 is controlled in accordance with the flow of FIG.

As described above, according to the present invention, even when the fixing unit U having the heating rollers 71 having different emissivities is mounted on the image forming apparatus, it is possible to accurately detect the temperature of the heating rollers 71. In addition, it is possible to prevent a variation in temperature in the longitudinal direction of the heating roller 71, and it is possible to detect an accurate temperature even when the infrared sensor 75 is contaminated by paper dust or the like.

Embodiment 2 FIG. 7 schematically shows another embodiment of the overall circuit configuration of the fixing device 7 according to the present invention. For the sake of simplicity, FIG.
The auxiliary halogen heater 73b is omitted.

In the first embodiment, the emissivity of the heating roller 71 is detected based on the presence or absence of the jumper wire 8a as the emissivity indicating means.
As an emissivity indicating means, a nonvolatile memory element (hereinafter referred to as “EE
PROM ". ) 8b is provided on the fixing unit U side. As the emissivity recognizing means, the EEPROM 8 is used.
An electrical contact 8b 'electrically connectable to the main body b is provided on the printer main body side.

The emissivity of the surface of the heating roller 71 whose temperature is to be detected can be directly stored in the EEPROM 8b. That is, in the first embodiment, the emissivity indicating means distinguishes the two types of emissivity depending on the presence or absence of the jumper line 8a. However, the EEPROM 8b of the present embodiment can store any type of arbitrary emissivity. The corresponding emissivity signal can be sent to the CPU 91 via the emissivity recognition means 8, which is an electrical contact 8b '. In this way, even when the fixing unit U including the heating roller 71 having an arbitrary emissivity is mounted on the image forming apparatus main body G, the software for controlling the temperature of the heating roller 71 included in the image forming apparatus main body G is provided. No need to change.

In addition to the emissivity, the EEPROM 8b
For example, information such as the number of passed sheets can be stored, which is advantageous in estimating the life of the fixing unit U.

As described above, according to the present embodiment, in addition to the operation and effect of the first embodiment, even when a fixing unit U having a heating roller having a plurality of types of emissivity is mounted on an image forming apparatus, accurate heating can be performed. The temperature of the roller 71 can be detected.

Embodiment 3 FIG. 8 schematically shows another embodiment of the overall circuit configuration of the fixing device 7 according to the present invention. For the sake of simplicity, FIG.
The auxiliary halogen heater 73b is omitted.

In the first embodiment, the emissivity of the heating roller 71 is detected by the presence or absence of the jumper wire 8a as the emissivity indicating means. In the present embodiment, the emissivity detecting device 8 uses an optical sensor.

A reflection type photo interrupter 8c 'is provided on the printer main body G as emissivity recognizing means, and the emissivity of the corresponding heating roller 71 is determined by the presence or absence of the reflector 8c provided on the fixing unit U as emissivity indicating means. Detect.

That is, when the fixing unit U is provided with the reflecting plate 8c, the light emitting section 8 of the photo interrupter 8c 'is provided.
The detection light D emitted by 1 is reflected by the reflection plate 8c and enters the light receiving section 82. The light receiving unit 82 inputs a reflectance signal to the CPU 91 via the digital input port 93 of the CPU 91. On the other hand, when the fixing unit U does not have the reflection plate 8c, this signal is not input to the CPU 91.

By storing the emissivity of the heating roller 71 corresponding to the presence or absence of the input signal from the photointerrupter 8c 'in the CPU in advance, the emissivity corresponding to the presence or absence of the reflection plate 8 is obtained. The CPU 91 corrects the temperature detected by the infrared sensor 75, and can detect an accurate temperature according to the emissivity of the heating roller 71.

The transmission type photo interrupter 8c 'can be provided on the image forming apparatus main body G side, and the temperature detection data can be corrected by the infrared emissivity corresponding to the presence or absence of the reflection plate 8c of the fixing unit U.

By using an optical sensor as in this embodiment, the number of connectors for connecting the image forming apparatus main body G and the fixing unit U can be reduced, and the possibility of poor contact and the like is reduced. Thus, the reliability of the detection of the emissivity detecting device 8 is improved.

As described above, according to the present embodiment, in the emissivity detecting device 8 of the present invention, the number of connectors between the fixing unit U and the image forming apparatus main body G is reduced, and the fixing unit U having the heating roller 71 having different emissivity is provided. Even when the heating roller 71 is mounted on the image forming apparatus, the temperature of the heating roller 71 can be accurately detected.

Fourth Embodiment FIG. 9 shows a schematic configuration of another embodiment of the fixing device 7 according to the present invention.

In the first embodiment, the image forming apparatus main body G is provided with a cleaning means 79a for cleaning the infrared sensor 75, and cleans dirt such as paper dust adhering to the infrared sensor 75. In the present embodiment, the heating roller 71, that is, in this embodiment, is located between the fixing unit U and the infrared sensor 75,
Covering means 7 covering the entire length of heating roller 71 in the longitudinal direction
9b is provided in the image forming apparatus main body G.

As described above, by providing the cover means 79b, it is possible to prevent paper dust and the like from contaminating the infrared sensor 75. Also, as described above, when the infrared sensor 75 is heated, the temperature detection accuracy is reduced. Then, the cover unit 79b is connected to the infrared sensor 7 from the heating roller 71.
5 also serves to block the propagation of heat to 5. The cover means 79b
Although not limited, it can be made of an infrared transmitting material, and is preferably polyethylene or single crystal silicon.

A cover 79b may be provided with a detection window 79c through which infrared light is transmitted so that the infrared sensor 75 can detect the temperature of the heating roller 71. Detection window 79c
Is made of a material that transmits infrared rays and blocks convective heat from the heating roller 71. For example, it can be made of an infrared transmitting material. As described above, as a matter of course, the cover means 79b itself can be made of a material that transmits infrared rays and blocks convective heat from the heating roller 71, such as made of an infrared transmitting material.

Further, a Fresnel lens can be provided as the detection window 79c. The Fresnel lens can efficiently collect infrared rays, and
This makes it possible to prevent contamination of the air, block convection heat, and accurately perform temperature detection.

For example, as shown in FIG. 10, a Fresnel lens as a detection window 79c is provided on a cover 79b at a position corresponding to the temperature detection positions A to C on the heating roller 71 described in the first embodiment. Infrared sensors can be fixedly provided at positions where the temperature can be detected by infrared rays passing through the respective Fresnel lenses.

In this manner, the heating roller 71 is partially passed through the hole provided in the cover means for transmitting infrared light.
Does not leak, and the temperature distribution of the heating roller 71 does not become uneven.

Incidentally, the infrared sensor 79b is set in the same manner as described above.
It is of course possible to make the heating roller 71 movable in the longitudinal direction.

As described above, according to the present embodiment, it is possible to prevent contamination of the infrared sensor 75 by paper dust and the like, and to prevent the temperature of the infrared sensor 75 itself from rising due to convection heat from the heating roller 71 and the like.

It is needless to say that the cover means 79b and the detection window 79c of this embodiment can be applied to the first to third embodiments.

In the first to fourth embodiments, the heating roller 7
1 and the emissivity indicating means (8a to 8c) are unitized to form a fixing unit U detachable from the image forming apparatus. However, the present invention is not limited to this. And the fixing unit U can be integrally formed. That is, the fixing unit U including at least the heating roller 71 and the emissivity indicating means can be detachably attached to the image forming apparatus main body.

Further, it is understood that the present invention is not limited to the roller as the heating roller 71 as the heating and fixing means, but may be any shape such as a belt shape. I want to.

[0105]

As described above, according to the present invention,
A fixing device for permanently fixing an unfixed toner image formed on a recording material on a recording material, and an image forming apparatus including the fixing device include a heating fixing device having a heating device; and an infrared emissivity of the heating fixing device. Emissivity indicating means for indicating an emissivity signal; temperature detecting means for detecting the temperature of the heat fixing means; emissivity recognizing means for recognizing the emissivity signal indicated by the emissivity indicating means; Means for correcting the detected temperature of the heating and fixing means in accordance with the infrared emissivity of the heating and fixing means in accordance with the emissivity signal, so that even when the heating and fixing means having different emissivities are mounted. The temperature of the heating and fixing means can be accurately detected, and the heating and fixing means; and a heating area for heating the heating and fixing means in a direction perpendicular to the recording material conveying direction of the heating and fixing means. of A plurality of heating means having different cloths; a temperature detecting means for detecting a temperature of the heating and fixing means; and a heat fixing by the plurality of heating means according to a temperature distribution of the heating and fixing means in a direction orthogonal to a recording material conveying direction. And means for controlling the heating of the means. Therefore, it is possible to prevent variations in temperature in the longitudinal direction of the heat fixing means and the like, and to detect the temperature of the heat fixing means and the heat fixing means. Temperature detecting means for moving the temperature detecting means in a direction perpendicular to the recording material conveying direction of the heat fixing means; and moving the temperature detecting means outside an area where the temperature detecting means and the heat fixing means face each other. Cleaning means for cleaning the temperature detecting means, which is provided on an extension of the direction, so that even if the temperature detecting means is contaminated with paper dust, etc. A temperature detecting means for detecting the temperature of the heating and fixing means; and a temperature detecting means for detecting the temperature of the heating and fixing means; located between the temperature detecting means and the heating and fixing means; And cover means for blocking convective heat; therefore, it is possible to prevent contamination of the temperature detecting means by paper dust and the like, and to prevent temperature rise of the temperature detecting means itself due to convective heat from the heat fixing means. Can be.

Therefore, according to the fixing device and the image forming apparatus of the present invention, it is possible to obtain a good fixing property by accurately detecting the temperature, and to prevent the heat fixing means from having a bad influence which causes a failure. It has become possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram of an embodiment of a fixing device according to the present invention.

FIG. 3 is a diagram illustrating a temperature detection portion of a heating roller.

FIG. 4 is a flowchart showing temperature control of a heating roller according to the present invention.

FIG. 5 is a block diagram for describing an operation outline of the fixing device according to the present invention.

FIG. 6 is a schematic configuration diagram for explaining an embodiment of emissivity detection means according to the present invention.

FIG. 7 is a schematic configuration diagram for explaining another embodiment of emissivity detecting means according to the present invention.

FIG. 8 is a schematic configuration diagram for explaining another embodiment of emissivity detecting means according to the present invention.

FIG. 9 is a schematic configuration diagram showing another embodiment of the fixing device according to the present invention.

FIG. 10 is a schematic configuration diagram showing another embodiment of the fixing device according to the present invention.

FIG. 11 is a schematic configuration diagram illustrating an example of a conventional image forming apparatus.

FIG. 12 is a schematic configuration diagram showing an example of a conventional temperature detecting means.

FIG. 13 is a schematic circuit diagram showing an example of a conventional infrared sensor input circuit.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 photosensitive drum 2 primary charging device 3 developing device 4 cleaner blade 6 transfer roller 7 fixing device 11 laser scanner unit 71 heating roller (heating fixing unit) 72 pressure roller (heating fixing unit) 73a main halogen heater (heating unit) 73b sub Halogen heater (heating means) 74 Stepping motor 75 Infrared temperature sensor (temperature detecting means) 77 Drive shaft 79a Cleaning means 79b Cover means 8 Emissivity detector 8a, 8b, 8c Emissivity indicating means 8a ', 8b', 8c ' Emissivity recognition / recognition means 91 CPU (central processing unit) 94 Infrared sensor input circuit 95 Power supply control circuit U Fixing unit G Image forming apparatus main body

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H033 AA03 AA18 AA42 BA03 BA06 BA25 BA31 BA32 BA37 BA48 BB01 CA02 CA27 CA44 CA57 5H323 AA36 BB20 CA06 CA08 CB04 FF01 FF10 GG16 HH02 HH09 KK05 MM02 NN03

Claims (84)

[Claims]
1. A fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, comprising: a heating and fixing unit having a heating unit; and a radiation responsive to the infrared emissivity of the heating and fixing unit. Emissivity indicating means for indicating an emissivity signal; temperature detecting means for detecting the temperature of the heat fixing means; emissivity recognizing means for recognizing an emissivity signal indicated by the emissivity indicating means; and the temperature detecting means And a means for correcting the temperature of the heating and fixing means detected by the heating and fixing means according to the infrared emissivity of the heating and fixing means in accordance with the emissivity signal.
2. The fixing device according to claim 1, wherein at least the heat fixing unit and the emissivity indicating unit are unitized to form a fixing unit that is detachable from the fixing device.
3. The fixing device according to claim 1, wherein the emissivity indicating means is a jumper wire, and the emissivity recognizing means is an electrical contact connectable to the jumper wire.
4. The emissivity indicating means is a non-volatile memory element, and the emissivity recognizing means is an electrical contact connectable to the non-volatile memory element.
Or the fixing device of 2.
5. The fixing device according to claim 1, wherein said emissivity indicating means is a reflection plate, and said emissivity recognition means is a reflection type photo interrupter.
6. The fixing device according to claim 1, wherein said emissivity indicating means is a reflection plate, and said emissivity recognition means is a transmission type photo interrupter.
7. The apparatus according to claim 1, further comprising: means for moving said temperature detecting means in a direction orthogonal to said recording material conveying direction of said heat fixing means. Fixing device.
8. The heating device according to claim 1, wherein the heating unit includes a plurality of heating units having different distributions of heating regions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit. The fixing device according to any one of the above items.
9. The fixing device according to claim 8, wherein the heating unit is a plurality of halogen heaters having different light distributions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit.
10. The image forming apparatus according to claim 1, further comprising a unit that controls heating of the heating and fixing unit by the plurality of heating units in accordance with a temperature distribution of the heating and fixing unit in a direction orthogonal to the recording material conveyance direction. The fixing device according to claim 8.
11. The heating control unit controls heating of the heating fixing unit by the plurality of heating units based on a temperature corrected according to an emissivity of the heating fixing unit. The fixing device according to claim 10, wherein:
12. A cleaning means for cleaning the temperature detecting means, which is located outside an area where the temperature detecting means and the heat fixing means face each other and on an extension of a moving direction of the temperature detecting means. The fixing device according to claim 7, wherein:
13. The fixing device according to claim 12, wherein the cleaning unit is a felt.
14. The apparatus according to claim 1, further comprising a cover unit located between said temperature detecting unit and said heat fixing unit, for transmitting infrared rays and blocking convective heat.
The fixing device according to any one of the above items.
15. The fixing device according to claim 14, wherein the cover unit is made of an infrared transmitting material.
16. The apparatus according to claim 1, wherein said cover means has an infrared detecting window made of an infrared transmitting material.
4 or 15 fixing devices.
17. The apparatus according to claim 1, wherein said cover means has an infrared detection window made of a Fresnel lens.
4 or 15 fixing devices.
18. The fixing device according to claim 1, wherein the heat fixing unit is a rotating body.
19. The heating and fixing means as the rotating body,
19. The fixing device according to claim 18, wherein the fixing device has a roller shape.
20. The fixing device according to claim 1, wherein a plurality of the temperature detecting units are provided in a direction orthogonal to the recording material conveying direction of the heat fixing unit. .
21. The fixing device according to claim 1, wherein the temperature detection unit is an infrared temperature sensor that is not in contact with the heating and fixing unit.
22. A fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, comprising: a heat fixing unit; and the recording unit of the heat fixing unit for heating the heat fixing unit. A plurality of heating units having different distributions of heating regions in a direction orthogonal to the material conveying direction; a temperature detecting unit for detecting a temperature of the heating and fixing unit; and a direction orthogonal to the recording material conveying direction of the heating and fixing unit. A means for controlling heating of the heating and fixing unit by the plurality of heating units in accordance with a temperature distribution in a direction in which the heating is performed.
23. The fixing device according to claim 22, further comprising a unit that moves the temperature detection unit in a direction orthogonal to the recording material conveyance direction of the heat fixing unit.
24. The fixing device according to claim 22, wherein the heat fixing unit is a rotating body.
25. The heating and fixing means as the rotating body,
25. The fixing device according to claim 24, wherein the fixing device has a roller shape.
26. The fixing device according to claim 22, wherein a plurality of the temperature detecting units are provided in a direction orthogonal to the recording material conveying direction of the heat fixing unit. .
27. A fixing device according to claim 22, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
28. The heating device according to claim 22, wherein the heating unit is a plurality of halogen heaters having different light distributions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit. The fixing device according to any of the above items.
29. A fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, wherein: a heating fixing unit; a temperature detecting unit for detecting a temperature of the heating fixing unit; Means for moving the temperature detecting means in a direction orthogonal to the recording material conveying direction of the heating and fixing means; and a moving direction of the temperature detecting means outside a region where the temperature detecting means and the heat fixing means face each other. And a cleaning unit provided on an extension line for cleaning the temperature detecting unit.
30. The fixing device according to claim 29, wherein the cleaning unit is a felt.
31. The fixing device according to claim 29, wherein the heat fixing unit is a rotating body.
32. The heating and fixing means serving as the rotating body,
The fixing device according to claim 31, wherein the fixing device has a roller shape.
33. The fixing device according to claim 29, wherein the temperature detection unit is an infrared temperature sensor that is not in contact with the heating and fixing unit.
34. A fixing device for permanently fixing an unfixed toner image formed on a recording material on the recording material, wherein: a heating fixing unit; a temperature detecting unit for detecting a temperature of the heating fixing unit; Located between a temperature detecting means and the heat fixing means,
A fixing device, comprising: cover means for transmitting infrared rays and blocking convective heat.
35. The fixing device according to claim 34, wherein the cover unit is made of an infrared transmitting material.
36. The apparatus according to claim 3, wherein the cover has an infrared detecting window made of an infrared transmitting material.
4 or 35 fixing devices.
37. The apparatus according to claim 3, wherein the cover has an infrared detection window made of a Fresnel lens.
4 or 35 fixing devices.
38. The apparatus according to claim 34, further comprising means for moving said temperature detecting means in a direction orthogonal to said recording material conveying direction of said heat fixing means. Fixing device.
39. The fixing device according to claim 34, wherein the heat fixing unit is a rotating body.
40. The heating and fixing means as the rotating body,
The fixing device according to claim 39, wherein the fixing device has a roller shape.
41. The fixing device according to claim 34, wherein a plurality of the temperature detection units are provided in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit. .
42. A fixing device according to claim 34, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
43. An image forming apparatus in which an unfixed toner image formed on a recording material is permanently fixed on the recording material to obtain a permanent image. Emissivity indicating means for indicating an emissivity signal corresponding to the emissivity, temperature detecting means for detecting the temperature of the heat fixing means, and emissivity recognizing means for recognizing the emissivity signal indicated by the emissivity indicating means And a means for correcting the temperature of the heat fixing means detected by the temperature detecting means in accordance with the emissivity signal in accordance with the infrared emissivity of the heat fixing means.
44. The image forming apparatus according to claim 43, wherein at least the heat fixing unit and the emissivity indicating unit are unitized to form a fixing unit detachable from the image forming apparatus main body.
45. The emissivity indicating means is a jumper wire, and the emissivity recognizing means is an electric contact connectable to the jumper wire.
Image forming apparatus.
46. The image according to claim 43, wherein said emissivity indicating means is a nonvolatile memory element, and said emissivity recognizing means is an electrical contact connectable to said nonvolatile memory element. Forming equipment.
47. The emissivity indicating means is a reflector,
45. The image forming apparatus according to claim 43, wherein the emissivity recognition means is a reflection type photo interrupter.
48. The emissivity indicating means is a reflector,
The image forming apparatus according to claim 43, wherein the emissivity recognition unit is a transmission type photo interrupter.
49. The apparatus according to claim 43, further comprising a unit for moving the temperature detecting unit in a direction orthogonal to the recording material conveying direction of the heating and fixing unit. Image forming device.
50. The heating device according to claim 43, wherein the heating device is a plurality of heating devices having different distributions of heating regions in a direction orthogonal to the recording material conveyance direction of the heating and fixing device. An image forming apparatus according to any one of the above items.
51. The image forming apparatus according to claim 50, wherein the heating unit is a plurality of halogen heaters having different light distributions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit. .
52. The image forming apparatus further comprising: a unit that controls heating of the heating and fixing unit by the plurality of heating units according to a temperature distribution of the heating and fixing unit in a direction orthogonal to the recording material conveyance direction. The image forming apparatus according to claim 50 or 51.
53. A means for controlling the heating of the heating and fixing unit, wherein the heating of the heating and fixing unit by the plurality of heating units is controlled based on a temperature corrected according to an emissivity of the heating and fixing unit. The image forming apparatus according to claim 52, wherein:
54. A cleaning device for cleaning the temperature detecting means, which is located outside an area where the temperature detecting means and the heat fixing means face each other and on an extension of the moving direction of the temperature detecting means. The image forming apparatus according to any one of claims 49 to 53, wherein:
55. An image forming apparatus according to claim 54, wherein said cleaning means is a felt.
56. The image forming apparatus according to claim 43, further comprising a cover positioned between said temperature detecting means and said heat fixing means, for transmitting infrared rays and blocking convective heat.
3. The image forming apparatus according to any one of items 3.
57. The image forming apparatus according to claim 56, wherein said cover means is made of an infrared transmitting material.
58. The apparatus according to claim 5, wherein the cover has an infrared detecting window made of an infrared transmitting material.
The image forming apparatus according to 6 or 57.
59. The apparatus according to claim 5, wherein the cover has an infrared detection window formed of a Fresnel lens.
The image forming apparatus according to 6 or 57.
60. The image forming apparatus according to claim 43, wherein said heat fixing means is a rotating body.
61. The heating and fixing means serving as the rotating body,
The image forming apparatus according to claim 60, wherein the image forming apparatus has a roller shape.
62. The image forming apparatus according to claim 43, wherein a plurality of the temperature detecting units are provided in a direction orthogonal to the recording material conveying direction of the heat fixing unit. apparatus.
63. An image forming apparatus according to claim 43, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
64. An image forming apparatus in which an unfixed toner image formed on a recording material is permanently fixed on the recording material to obtain a permanent image, wherein: a heat fixing unit; and the heating unit for heating the heat fixing unit. A plurality of heating units having different heating area distributions in a direction orthogonal to the recording material conveying direction of the heating and fixing unit; a temperature detecting unit for detecting a temperature of the heating and fixing unit; Means for controlling heating of the heating and fixing means by the plurality of heating means in accordance with a temperature distribution in a direction orthogonal to the recording material conveyance direction.
65. The image forming apparatus according to claim 64, further comprising means for moving said temperature detecting means in a direction orthogonal to said recording material conveying direction of said heat fixing means.
66. The image forming apparatus according to claim 64, wherein the heat fixing unit is a rotating body.
67. The heating and fixing means as the rotating body,
The image forming apparatus according to claim 66, wherein the image forming apparatus has a roller shape.
68. The image forming apparatus according to claim 64, wherein a plurality of the temperature detecting units are provided in a direction orthogonal to the recording material conveying direction of the heating and fixing unit. apparatus.
69. An image forming apparatus according to claim 64, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
70. The heating device according to claim 64, wherein the heating unit is a plurality of halogen heaters having different light distributions in a direction orthogonal to the recording material conveyance direction of the heating and fixing unit. An image forming apparatus according to any of the above items.
71. An image forming apparatus for permanently fixing an unfixed toner image formed on a recording material on the recording material to obtain a permanent image, comprising: a heating and fixing unit; Temperature detecting means, means for moving the temperature detecting means in a direction perpendicular to the recording material conveying direction of the heat fixing means, and the temperature outside an area where the temperature detecting means and the heat fixing means are opposed to each other. An image forming apparatus comprising: a cleaning unit that is provided on an extension of a moving direction of the detection unit and that cleans the temperature detection unit.
72. The image forming apparatus according to claim 71, wherein said cleaning means is a felt.
73. An image forming apparatus according to claim 71, wherein said heat fixing means is a rotating body.
74. The heating and fixing means serving as the rotating body,
The image forming apparatus according to claim 73, wherein the image forming apparatus has a roller shape.
75. The image forming apparatus according to claim 71, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
76. An image forming apparatus for permanently fixing an unfixed toner image formed on a recording material on the recording material to obtain a permanent image, comprising: a heating fixing unit; Temperature detecting means, located between the temperature detecting means and the heat fixing means,
An image forming apparatus, comprising: cover means for transmitting infrared rays and blocking convective heat.
77. The image forming apparatus according to claim 76, wherein said cover means is made of an infrared transmitting material.
78. The apparatus according to claim 7, wherein the cover means has an infrared detecting window made of an infrared transmitting material.
6 or 77 image forming apparatus.
79. An apparatus according to claim 7, wherein said cover means has an infrared detection window made of a Fresnel lens.
6 or 77 image forming apparatus.
80. The apparatus according to claim 76, further comprising: means for moving said temperature detecting means in a direction orthogonal to said recording material conveying direction of said heat fixing means. Image forming device.
81. An image forming apparatus according to claim 76, wherein said heat fixing means is a rotating body.
82. The heating and fixing means serving as the rotating body,
The image forming apparatus according to claim 81, wherein the image forming apparatus has a roller shape.
83. An image forming apparatus according to claim 76, wherein a plurality of said temperature detecting means are provided in a direction orthogonal to said recording material conveying direction of said heat fixing means. apparatus.
84. The image forming apparatus according to claim 76, wherein said temperature detecting means is an infrared temperature sensor which is not in contact with said heat fixing means.
JP11029358A 1999-02-05 1999-02-05 Fixation device and picture forming device Pending JP2000227732A (en)

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JP2002296953A (en) * 2001-03-29 2002-10-09 Ricoh Co Ltd Fixing device and image forming apparatus
US7027075B2 (en) 2002-06-10 2006-04-11 Brother Kogyo Kabushiki Kaisha Thermal fixing device and image forming device provided with the same
US7079782B2 (en) 2004-03-22 2006-07-18 Kabushiki Kaisha Toshiba Fuser and temperature control method
US7587147B2 (en) 2005-09-20 2009-09-08 Sharp Kabushiki Kaisha Fixing apparatus and image forming apparatus with temperature control
US7668473B2 (en) 2006-08-24 2010-02-23 Sharp Kabushiki Kaisha Fixing device and image forming apparatus
US7778557B2 (en) 2005-11-28 2010-08-17 Sharp Kabushiki Kaisha Fixing apparatus and image forming apparatus
JP2011209416A (en) * 2010-03-29 2011-10-20 Fuji Xerox Co Ltd Fixing device and image forming apparatus
JP2012177790A (en) * 2011-02-25 2012-09-13 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus
EP2597531A2 (en) 2011-10-27 2013-05-29 Konica Minolta Business Technologies, Inc. Image forming apparatus
US8824904B2 (en) 2011-05-26 2014-09-02 Konica Minolta Business Technologies, Inc. Fixing device and image forming apparatus
US10671000B2 (en) * 2018-09-19 2020-06-02 Kyocera Document Solutions Inc. Fixing device and image forming apparatus including the same

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JP4689067B2 (en) * 2001-03-29 2011-05-25 株式会社リコー Fixing device and image forming device
JP2002296953A (en) * 2001-03-29 2002-10-09 Ricoh Co Ltd Fixing device and image forming apparatus
US7027075B2 (en) 2002-06-10 2006-04-11 Brother Kogyo Kabushiki Kaisha Thermal fixing device and image forming device provided with the same
US7079782B2 (en) 2004-03-22 2006-07-18 Kabushiki Kaisha Toshiba Fuser and temperature control method
US7212761B2 (en) 2004-03-22 2007-05-01 Kabushiki Kaisha Toshiba Fuser and temperature control method
JP2011118436A (en) * 2004-03-22 2011-06-16 Toshiba Corp Fixing apparatus
US7587147B2 (en) 2005-09-20 2009-09-08 Sharp Kabushiki Kaisha Fixing apparatus and image forming apparatus with temperature control
US7778557B2 (en) 2005-11-28 2010-08-17 Sharp Kabushiki Kaisha Fixing apparatus and image forming apparatus
US7668473B2 (en) 2006-08-24 2010-02-23 Sharp Kabushiki Kaisha Fixing device and image forming apparatus
JP2011209416A (en) * 2010-03-29 2011-10-20 Fuji Xerox Co Ltd Fixing device and image forming apparatus
US8509666B2 (en) 2010-03-29 2013-08-13 Fuji Xerox Co., Ltd. Fixing device and image forming apparatus
JP2012177790A (en) * 2011-02-25 2012-09-13 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus
US8824904B2 (en) 2011-05-26 2014-09-02 Konica Minolta Business Technologies, Inc. Fixing device and image forming apparatus
EP2597531A2 (en) 2011-10-27 2013-05-29 Konica Minolta Business Technologies, Inc. Image forming apparatus
US8948625B2 (en) 2011-10-27 2015-02-03 Konica Minolta, Inc. Image forming apparatus for detecting abnormality of a fixing device
US10671000B2 (en) * 2018-09-19 2020-06-02 Kyocera Document Solutions Inc. Fixing device and image forming apparatus including the same

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