JPH11207941A - Ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a recording paper which is not treated to be water-resistant to be dried before ink could run by arranging a means to dry and fix the ink after discharging it onto a recording medium in the neighborhood of an ink recording head part made up of a high frequency heating means comprising a magnetron. SOLUTION: This ink jet recording device comprises conveyance rollers 1, 2 which guide a recording paper 5 to an ink recording head part 3 from a paper feed tray, a head part 3 for printing ink to the recording paper 6, conveyance rollers 4, 5 which guide the recording paper 6 printed to a paper unloading tray and further, a heating furnace 7 of a ladder shape as one of high-frequency heating furnaces which is arranged right below the head part 3 and at the lower part of the recording paper 6, and a magnetron 38 connected to the heating furnace 7 through a connecting part 42. In addition, after the printing of data on the recording paper 6 by the head part 3, the recording paper 6 is heated by induction frequency using the magnetron 38 provided below the head part 3 and the recording paper 6. In this case, however, the discharged ink is dried leaving no time for it to permeate into the recording paper 6 as a waveguide is located right below the head part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet type recording apparatus in which a magnetron which oscillates high frequency is mounted on a main body so that ink outputted on a recording medium such as paper is dried quickly.

[0002]

2. Description of the Related Art Conventionally, in a recording apparatus such as a printer or a copier equipped with an ink recording head, a recording medium such as a sheet (hereinafter referred to as a sheet) is used for the recording from the ink recording head.
After the ink was printed (output) on the paper, the paper was directly discharged to a paper discharge tray, and the ink printed on the paper was dried by natural drying.

[0003] However, when the ink is dried by natural drying, the drying of the ink is considerably slow.
For example, if you touch the print area immediately after the recording paper is discharged to the paper output tray, the ink is not sufficiently dried.
There has been a problem in that ink adheres to the hand, and stains and print quality deteriorate due to rubbing of a print portion with a feed roller or the like.

[0004] In addition, when the recording paper used is a special paper which has been subjected to a water-resistant treatment, there is no ink bleeding on the paper. Immediately after printing was performed, the ink permeated into the recording paper, and there was a problem that ink bleeding and sufficient image density could not be obtained.

Accordingly, as a method for solving the above problems,
A heating and drying method has been proposed in which a heater is provided in the vicinity of the printing section. However, since the heating temperature is about 40 to 70 degrees, although it is possible to dry the ink to some extent,
It is difficult to dry quickly, and ink bleeding on paper that has not been treated with water resistance has not been able to be solved.

[0006] The use of a heat-condensed tube as a heater has also been proposed. However, when a heat-condensed tube is used, it is necessary to heat, so that power consumption increases and there is a problem in responsiveness.

In order to solve the above-mentioned problem, Japanese Patent Laid-Open Publication No. 3-130158 has been proposed. According to the technical content described in the publication, a space between electrode plates disposed opposite to each other in a main body is disclosed. In addition, a method has been proposed in which an alternating electric field is formed by a predetermined electric circuit, and the recording paper passes therebetween to promote drying of the ink on the recording paper.

[0008]

Problems to be Solved by the Invention
According to the technical content described in Japanese Patent Application Publication No. 8 (1996) -1994, an alternating electric field is formed by a predetermined electric circuit between electrode plates arranged opposite to each other in a main body, and the recording paper passes between the electric fields to form an alternating electric field. This is effective in that the drying of the ink can be promoted, and even when plain paper is used, the printed portion of the recording paper can be dried rapidly to prevent the print quality from deteriorating due to rubbing.

However, the publication discloses that the power supply voltage 12
V, an embodiment in which an alternating electric field is generated at a frequency of 8 MHz to dry the ink on the recording paper is disclosed, but the energy is not enough to quickly dry the water in the ink, There is a problem that sufficient drying cannot be performed depending on the type of paper and the type of paper.

In addition, according to the method described in the publication, since electrodes are required on both sides, the electrodes must necessarily be provided at a fixed distance from the ink recording head. Are printed and are conveyed to the discharge tray.

Therefore, drying of the ink on the recording paper after the discharge is solved to some extent. However, since a part of the ink permeates the recording paper for a short time, the recording paper which has not been subjected to the water-resistant treatment as it is can be used. The problem that the ink permeates and the image density decreases is not solved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to quickly dry ink before ink is permeated even when a recording sheet that has not been subjected to a water-resistant treatment is used. It is an object of the present invention to provide an ink jet recording apparatus capable of performing the above.

Another object of the present invention is to provide an ink jet recording apparatus capable of discharging evaporated water of ink to the outside of the apparatus so that dust does not enter from outside the apparatus.

Further, according to the present invention, by monitoring the temperature and the transport status of the recording paper during printing, it is possible to prevent the abnormal rise in the temperature of the recording paper and the intensive heating, thereby enabling the ink to be dried. It is an object of the present invention to provide an ink jet recording apparatus with high performance.

[0015]

According to a first aspect of the present invention, there is provided an ink jet recording apparatus including a fixing unit for discharging an ink from an ink recording head onto a recording medium, drying the ink, and drying and fixing the ink on the recording medium. In the ink jet recording apparatus, the fixing unit includes a high-frequency heating unit composed of a magnetron, and the high-frequency heating unit is disposed near the ink recording head unit.

According to a second aspect of the present invention, there is provided the ink jet recording apparatus according to the first aspect, wherein the location of the high-frequency heating means is near the downstream side and / or the opposite side in the transport direction with respect to the ink recording head. .

According to a third aspect of the present invention, in the ink jet recording apparatus according to the first or second aspect, the magnetron includes a cold cathode having an electron emitting portion, a divided anode forming a cavity, and a portion between the cold cathode and the divided anode. And a magnet arranged to give a magnetic field orthogonal to the electric field.

According to a fourth aspect of the present invention, there is provided an ink jet recording apparatus according to the first or second aspect, wherein a predetermined opening is provided in an upper main body exterior part of the ink recording head within a movable range of the ink recording head. And

According to a fifth aspect of the present invention, there is provided an ink jet recording apparatus according to the first or second aspect, further comprising means for detecting an anode temperature of the magnetron, and controlling an oscillation output of the magnetron in accordance with a detection signal from the detection means. And a control means for the

According to a sixth aspect of the present invention, there is provided the ink jet recording apparatus according to the first or second aspect, further comprising detecting means for detecting a temperature of the recording medium, and oscillating output of the magnetron according to a detection signal from the detecting means. Is provided with control means for controlling.

According to a seventh aspect of the present invention, there is provided an ink jet recording apparatus according to the first or second aspect, further comprising a detecting means for detecting the magnetism of the recording medium, and oscillating the magnetron according to a detection signal from the detecting means. Is controlled.

According to an eighth aspect of the present invention, there is provided an ink jet recording apparatus according to the first or second aspect, further comprising detecting means for detecting a paper jam of the recording medium, and controlling the oscillation output of the magnetron in accordance with a detection signal from the detecting means. It is characterized by doing.

[0023]

(First Embodiment of the Present Invention) FIG. 1
FIG. 2 is a perspective view of the inside of an ink jet recording apparatus provided with the magnetron according to the present invention, and FIG. 2 is a cross-sectional side view thereof, for guiding recording paper 6 from a paper feed tray to an ink recording head unit 3 described later. Transport rollers 1 and 2; an ink recording head 3 for printing and outputting ink 8 on recording paper;
Ladder-like one of high-frequency heating furnaces is provided directly below the transport rollers 4 and 5 and the ink recording head 3 and below the recording paper (1 mm below) for guiding the recording paper on which the ink is printed to the discharge tray. Heating furnace 7 is arranged, and
2, a magnetron 38 is connected.

FIG. 3 is a detailed structural view and a front sectional view of the magnetron 38, and FIG. 4 shows a detailed view of the ladder heating furnace 7. As shown in FIG.

The magnetron 38 is an oscillator for outputting microwaves, and is used as a microwave supply source for a microwave oven or the like because of its high oscillation efficiency and high output. A plurality of vanes 10 are formed so as to project radially, and the anode cylinder 9 and the vanes 10 constitute a cavity resonator.

The cathode 11 is arranged on the central axis of the cylindrical anode cylinder 9, and the space surrounded by the cathode 11 and the vane 10 is the working space 12. Pole pieces 13 and 14 for forming a uniform magnetic field in the working space 12 are attached to the upper and lower ends of the anode cylinder 9, respectively.
Magnets 15 and 20 are tightly fixed to 3 and 14, and a heat sink 1 is provided between the anode cylinder 9 and the yoke 16.
7 are arranged in large numbers.

The principle of operation of a general magnetron will be described.
When a magnetic field is applied to the working space 12 by 20 and a high voltage is applied between the cathode 11 and the vane 10 from the input unit 18, electrons jump out toward the cathode 11 and the vane 10.
The protruding electrons travel in the working space 12 toward the vane 10 under the influence of the magnetic field received by the magnets 5 and 20. From the electrons traveling through the working space 12, the anode cylinder 9
Energy is given to the cavity resonator constituted by the cavities 10 and the vanes 10, the microwaves are oscillated, extracted from the output unit 19, and guided to the waveguide 7.

FIG. 4A shows a perspective view of the ladder-shaped heating furnace 7 and a state in which a magnetron 38 is connected via a connecting portion 42. Conductor material (copper, etc.)
The connection section 42 made of the magnetron 38 outputs the output section 1
A slope plate 46 is provided so that the high frequency wave passing through 9 is efficiently guided onto the ridge 21.

The heating furnace 7 shows a general form of a ladder circuit used as a high-frequency heating furnace. The heating furnace 7 is made of a conductive material (copper or the like) and is provided with an electric field depending on its height. A convex ridge 21 for adjusting the strength is provided (the electric field changes depending on the distance between the surface of the convex portion and the ladder portion 45), and a slot 22 orthogonal to the waveguide is periodically formed on the surface facing the ridge 21. Cut into pieces.

The high frequency output from the magnetron 38 through the output portion 19 passes through the connection portion 42 and is guided between the ridge 21 and the ladder 45 by the slope plate 46, so that the distance between the ladder 45 and the lower surface is reduced. High frequency power is enhanced.

Further, as shown in FIG. 4 (B), the electric field is concentrated and transmitted near the slot 22 by the ladder-shaped slot, and the intensity of the electric field and the reach of the electric field are adjusted by the width of the slot 22. . If there is no slot, the electric field does not fly outside, and if the slot is not a ladder but a wide surface, the electric field is very weak and spreads over a wide range, so a ladder-like slot is necessary. is there.

Therefore, when the sheet-like object to be heated is passed close to the slot 22, efficient heating can be easily performed. Also, since the shape is flat and the electric field is radiated in a short distance in one side direction, it is most suitable to be located below (near the opposing position) the ink recording head 3 of the present invention.

The recording paper 6 is guided to the ink recording head 3 by the transport rollers 1 and 2, and predetermined printing is performed on the recording paper 6 by the ink recording head 3. Thereafter, heating is performed by a magnetron 38 provided below the ink recording head 3 and the recording paper 6 at an induction frequency under the following conditions.

(1) Oscillation frequency 2.45 GHz (2) High-frequency output 200 W (3) Applied magnetic field 1000 gauss Generally, water accounts for more than half of the total components in the ink. Is heated by induction heating and evaporates quickly. In particular, since the waveguide is directly below the ink recording head 3, the ink recording head 3
Immediately after the ink is printed on the recording paper 6, the ink is dried by the induction heating by the microwave immediately before the ink permeates the recording paper 6.

Thereafter, the recording paper 6 is discharged to the paper discharge tray by the conveying rollers 4 and 5, but since the ink is quickly dried by the magnetron 38, the obtained image has little bleeding of the ink and can be immediately hand-printed. No ink stains were seen when touched.

According to the embodiment shown in FIG. 2, the heating furnace 7 is disposed at a position substantially opposite to the ink recording head unit 3 via the recording medium conveyance path, and the optimal arrangement is achieved. Although the heating furnace may be provided in parallel with the downstream side of the transport path of the ink recording head, there is a concern that bleeding may occur depending on the quick-drying ink and the material of the recording medium. The space for the device can be reduced, and the effect of reducing the thickness of the device can be obtained.

(Second Embodiment of the Present Invention) FIG.
In the device described in the embodiment, instead of a normal magnetron, instead of a hot cathode, a cold cathode having an electron emitting portion, a split anode forming a cavity resonator flatly opposed to the electron emitting portion, FIG. 5 is a sectional view of an embodiment using a magnetron composed of a magnet that applies a magnetic field orthogonal to an applied electric field between the cold cathode tube and the split anode tube, and FIG. 5 is a perspective view thereof.

In the magnetron, an electron emitting portion 28 made of a cold cathode is formed on the inner surface of a planar substrate 27, and an accelerating anode 29 for applying a high electric field to the electron emitting portion 28 at a fixed distance from the inner surface is arranged. Have been.

The electron emission section 28 is formed of a field emission type array, and has a number of minute projections formed as an emitter (electron source). Also, the split anode 30 is
An output part 25 for emitting electrons to the outside is formed at a position just before the right end of the divided anode 29 adjacent to the substrate 9 and at a fixed distance from the inner surface of the substrate 27.

Further, a magnet 26 is disposed so as to cover the entire electronic space.
4, and a heat sink 43 is also provided above the split anode.

The principle of operation will be described. Electrons emitted from the electron emitting section 28 are bent rightward in the figure by the magnetic field received from the magnet 26, and are generated in the working space 31 of the cavity resonator having the split anode 30 by the electric field and the magnetic field. The effect is given by the action of, and it proceeds to the right while emitting high frequency energy. Then, the potential energy given by the application is emitted from the output unit 25 as high-frequency energy, and is guided to the heating furnace 7.

When the magnetron was operated under the following conditions, the ink printed on the recording paper was immediately dried, and good image quality was obtained.

(1) Anode voltage 500 V (2) Gate voltage 150 V (3) Applied magnetic field 1000 Gauss (4) Transmission frequency 2.45 GHz, high frequency output 10
0W (Third Embodiment of the Invention) In the apparatus described in the first embodiment, a mesh-shaped hole 35 is formed in the movable range 34 of the ink recording head 3 above the main body cover 32 as shown in FIG. Is provided. The reason for providing the holes is that when the inside of the main unit is dried by a magnetron, the water accumulates every time printing is repeated inside the main unit, and the inside of the main unit becomes a saturated atmospheric pressure, and no more water evaporates. A predetermined hole is provided in the upper part of the main body in order to allow the drained water to escape outside the main body.

If a hole is provided in the upper portion of the main body cover 32, dust or the like may enter the main body from the outside. Therefore, the hole is formed in the minimum range in which the ink recording head can move, and the hole is formed in a mesh shape. It is necessary to reduce the diameter, but if it is too small, the flow of air becomes worse, so that there is an appropriate range of the diameter of the hole such that a good image can be obtained even when printing is repeated, Table 1 shows the results of the study.

[0045]

[Table 1]

An opening and closing shutter is provided in a hole in the upper part of the main body cover, and the shutter is opened only at a timing when there is no leakage of the electromagnetic wave so that the electromagnetic wave emitted from the fixing portion does not leak out of the apparatus. It is also possible to enhance safety while releasing the water that is discharged.

(Fourth Embodiment of the Present Invention) In the apparatus described in the third embodiment, an exhaust fan 37 is provided above the main body cover 32 as shown in FIG. By doing so, the vapor of the moisture generated by the magnetron in the main body can be efficiently discharged through the hole to the outside of the main body.

Further, it was confirmed that the image was clear and good without any other problems even when the printing was repeated. In addition,
The type of the exhaust fan 37 is not particularly limited.
A cross flow type or a square fan type may be used as long as a predetermined air flow can be secured.

(Fifth Embodiment of the Present Invention) In the apparatus described in the first and third embodiments, a temperature sensor 39 for detecting a temperature is provided on the anode electrode, and the temperature is set to a predetermined temperature or higher. Then, the operation of the magnetron is stopped.

FIG. 9 is a block diagram showing the arrangement. First, when the temperature of the anode electrode is detected by the temperature sensor 39, the detection output is output to the control circuit.
It is determined whether or not the operation of the magnetron 38 is to be stopped according to the detection output from.

Next, the result of the determination is output as a signal to the power supply circuit, and the power to the magnetron 38 is turned off when the power supply is stopped. This is to prevent the temperature of the magnetron 38 from rising abnormally due to some trouble and the magnetron 38 from burning. This method can prevent the temperature of the magnetron 38 from rising even when printing is repeated, and a stable image can be obtained.

As the temperature sensor, various types such as a thermistor and a thermostat can be applied. In order to output a signal to a power supply circuit based on an output from the temperature sensor, an analog digital port in a microcomputer of a control circuit is used. It is also possible to perform analog-to-digital conversion and input and control according to the port resolution.
It is also possible to control using a comparator or the like.

(Sixth Embodiment of the Present Invention) In the apparatus described in the first and third embodiments, a temperature sensor 44 for detecting the temperature of the recording paper 6 during printing is provided as shown in FIG. When the temperature exceeds a predetermined temperature, the operation of the magnetron is stopped, and a block configuration diagram thereof is shown in FIG.

The temperature of the recording paper 6 is detected by the temperature sensor 44, and the detection output is output to the control circuit. The control circuit determines whether or not to stop the operation of the magnetron 38 according to the detection output of the temperature sensor 44, and sends the determination result as a signal to the power supply circuit.
Turn off the power.

This is because, when a special recording paper (for example, a special paper containing a metal object) is used as the recording paper 6, the temperature of the recording paper 6 may abnormally increase due to induction heating by the magnetron 38. By providing the temperature sensor 44 on the recording paper 6, the temperature of the recording paper 6 is prevented from rising.

As described in the fifth embodiment, various types of temperature sensors 44 and temperature control methods can be employed. Needless to say, it is necessary to prevent trouble in the conveyance of the ink image and the paper.

(Seventh Embodiment of the Present Invention) In the apparatus described in the first and third embodiments, as shown in FIG. 12, a magnetic sensor 41 for detecting the presence or absence of metal on the recording paper 6 before printing is used. The operation of the magnetron is stopped when the detection signal exceeds a predetermined output. FIG. 11 is a block diagram showing the configuration. The magnetic sensor 41 detects the magnetism of the recording paper 6 and outputs the detection output to a control circuit. The control circuit determines whether or not to stop the operation of the magnetron 38 according to the detection output, sends the determination result to the power supply circuit as a signal, and turns off the power of the magnetron 38 in the case of the stop.

If the recording paper 6 is made of a special paper containing a metal material, the temperature of the recording paper 6 may be abnormally increased due to induction heating by the magnetron 38. This is to prevent the temperature of the recording paper 6 from rising due to the provision of 41.

(Eighth Embodiment of the Present Invention) In the apparatus described in the first and third embodiments, a paper jam detector 49 is provided on the recording paper transport path as shown in FIG. When the conveyance of the recording paper 6 is stopped due to a problem such as a paper jam during printing, the magnetron 3
8 is to be stopped, and its block diagram is shown in FIG.

The paper jam detector 49 detects a paper jam of the recording paper 6 and outputs its detection output to the control circuit. The control circuit determines whether to stop the operation of the magnetron 38 in accordance with the detection output of the paper jam detector 49, sends the determination result as a signal to the power supply circuit, and turns off the power of the magnetron 38 in the case of the stop. This is because when the recording paper 6 is not conveyed due to a paper jam, or when the recording paper 6 is made of a special paper containing a metal material to prevent the temperature of the recording paper 6 from increasing due to induction heating of the magnetron 38, This is because the temperature of the recording paper 6 may increase.

As a paper jam detector, there are a detector for monitoring reflection and transmission by a light emitting / receiving element, and a detector for detecting by physical operation of an actuator. In order to perform this, it is desirable that the detection can be performed without contact.

Various methods for detecting a paper jam are conceivable. The presence of a recording medium may be directly detected from the output value of the paper jam detector 49. For example, the paper jam detector on the upstream side may be used. A method for causing a paper jam when the downstream paper jam detector cannot confirm the presence of the recording medium even after a predetermined time has elapsed since the upstream and other upstream detectors (not shown) confirm the presence of the recording medium. As a matter of course, the detection method is not limited to the present embodiment.

[0063]

According to the ink jet recording apparatus of the present invention, the fixing means is constituted by a high-frequency heating means comprising a magnetron, and the high-frequency heating means is disposed near the ink recording head. Immediately after the ink is printed on the recording medium from the ink recording head, the ink can be dried by the induction heating by the microwave just before the ink soaks into the recording medium, and there is an effect that no bleeding or stain occurs.

For example, by using a ladder-like heating furnace, when the object to be heated is a sheet, the heating induction effect is effective, the shape is flat, and the electric field is applied in one direction. Since the light is radiated at a short distance, an effect is obtained that it is optimal to be located below the ink recording head.

Further, since a relatively inexpensive recording medium which has not been subjected to a water-resistant treatment can be used, the running cost is reduced, and the degree of freedom for the operator to select the recording medium when using the apparatus is increased. The effect is also obtained.

Further, power consumption can be reduced as compared with the case where a hot-cold tube is used as a heater, and responsiveness can be improved. Thus, compared to the conventional method using an alternating electrode, the device can be saved. Space is also possible.

According to the ink jet recording apparatus of the present invention, the high frequency heating means is disposed on the downstream side and / or the opposing side in the transport direction with respect to the ink recording head, so that recording is performed from the ink recording head. Immediately after the ink is printed on the medium, the ink can be dried by the induction heating by the microwave just before the ink soaks into the recording medium, and there is an effect that no bleeding or stain occurs.

Further, in addition to the effects of the first aspect, the space can be saved in the thickness direction of the apparatus when they are arranged in parallel, and in the paper transport direction when they are arranged opposite to each other. Easy and inexpensive,
It is possible to reduce the weight of the device and the product cost.

According to the ink jet recording apparatus of the third aspect, since the magnetron uses a cold cathode tube for electron emission, there is no need to heat the magnetron unlike a conventional hot cathode tube, so that power consumption can be reduced. In addition, there is an effect that the operation can be performed immediately after the application of the driving voltage without delay. Further, since the obtained current density is very large, there is an effect that the shape of the magnetron can be reduced.

According to the ink jet recording apparatus of the present invention, by providing a predetermined opening (preferably 1 to 5 mm) in the movable range of the ink recording head 3 in the main body cover 32, the evaporated water can be removed from the main body. The effect that it becomes possible to sufficiently remove it outside is obtained.

Also, an effect is obtained that dust and the like can be prevented from entering the main body from outside.

Further, by providing the exhaust means on the upper part,
The effect that the vapor of the water generated by the magnetron generated in the main body can be efficiently discharged through the hole and out of the main body is also obtained. Note that the use of a shutter member that opens only at a timing at which electromagnetic waves do not leak can provide an effect of further improving safety.

According to the ink jet recording apparatus of the present invention, the temperature detection means is provided on the anode electrode, and the operation of the magnetron is controlled in accordance with the detection signal. Can be prevented from rising.

According to the ink jet recording apparatus of the present invention, a temperature detecting means for detecting the temperature of the recording medium during printing is provided, and the operation of the magnetron is controlled in accordance with the detection signal, whereby the recording medium is controlled. Abnormal rise in temperature can be prevented.

According to the ink jet recording apparatus of the present invention, the magnetic detecting means for detecting the presence or absence of metal on the recording medium before printing is provided, and the operation of the magnetron is controlled according to the detection signal. An abnormal rise in temperature of the recording medium can be prevented.

According to the ink jet recording apparatus of the eighth aspect, a paper jam detecting means is provided, and the operation of the magnetron is controlled in accordance with the detection signal so that when the conveyance of the recording medium is stopped, the operation of the magnetron is stopped. Intensive heating of the recording medium can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which a magnetron is arranged near a position facing an ink recording head.

FIG. 2 is a side cross-sectional view when the magnetron shown in FIG. 1 is arranged near a position facing an ink recording head.

FIG. 3 is a schematic sectional view showing a general magnetron.

FIG. 4 is a perspective view showing a ladder-shaped embodiment of a heating furnace, which is one of the components of the magnetron, and a part of a side sectional view of the ladder-shaped heating furnace.

FIG. 5 is a perspective view showing an embodiment of a magnetron including a cold cathode electron emission unit.

FIG. 6 is a side sectional view of the magnetron shown in FIG. 5;

FIG. 7 is a perspective view illustrating an embodiment in which a hole in a range in which an ink recording head is movable is provided in a main body upper cover portion (exterior portion).

FIG. 8 is a perspective view showing an embodiment in which an exhaust fan is provided in a main body upper cover portion.

FIG. 9 is a block diagram showing an embodiment in which a temperature detection is provided to the anode electrode and the output of the magnetron is controlled by the detection signal.

FIG. 10 is a side sectional view showing an embodiment in which temperature detection of a recording sheet is provided.

FIG. 11 is a block diagram showing an embodiment in which temperature detection of a recording sheet is provided and the output of the magnetron is controlled by the detection signal.

FIG. 12 is a side sectional view showing an embodiment in which a magnetic sensor is provided.

FIG. 13 is a block diagram showing an embodiment in which a magnetic sensor is provided and the output of the magnetron is controlled by the detection signal.

FIG. 14 is a side cross-sectional view illustrating an embodiment in which paper jam detection of recording paper is provided.

FIG. 15 is a block diagram showing an embodiment in which a paper jam detection unit for recording paper is provided and the output of the magnetron is controlled based on the detection signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper conveyance roller 2 Lower conveyance roller 3 Ink recording head 4 Upper conveyance roller 5 Lower conveyance roller 6 Recording paper 7 Heating furnace 8 Ink 9 Anode cylinder 10 Bain 11 Cathode 12 Working space 13 Pole piece 14 Pole piece 15 Magnet 16 Yoke 17 Heat radiation Plate 18 Filament lead 19 Output unit 20 Magnet 21 Ridge 22 Slot 23 Electric field 24 Heat sink 25 Output unit 26 Magnet 27 Substrate 28 Electron emission unit 29 Acceleration anode 30 Split anode 31 Working space 32 Main body cover 33 Paper ejection tray 34 Ink recording head Operating range 35 Hole 36 Paper feed tray 37 Exhaust fan 38 Magnetron 39 Temperature sensor 40 Transport roller 41 Magnetic sensor 42 Paper jam detection 43 Support base 42 Connection part 43 Heat sink 44 Temperature sensor 45a Ladder 45 b Ladder 46 Slope board 49 Paper jam detector

Claims (8)

[Claims] 1. An ink jet recording apparatus comprising: fixing means for discharging ink from an ink recording head onto a recording medium, drying the ink, and drying and fixing the ink on the recording medium; An ink jet recording apparatus comprising a heating unit, wherein the high frequency heating unit is disposed near the ink recording head unit. 2. The ink-jet recording apparatus according to claim 1, wherein the high-frequency heating means is disposed near a downstream side and / or an opposite side in a conveying direction with respect to the ink recording head. 3. The magnetron includes a cold cathode having an electron emission portion, a divided anode forming a cavity resonator, and a magnet arranged to apply a magnetic field orthogonal to an electric field between the cold cathode and the divided anode. The ink jet recording apparatus according to claim 1, wherein: 4. The ink jet recording apparatus according to claim 1, wherein a predetermined opening is provided in an upper body exterior part of the ink recording head in a movable range of the ink recording head. 5. The apparatus according to claim 1, further comprising means for detecting an anode temperature of the magnetron, and control means for controlling an oscillation output of the magnetron in accordance with a detection signal from the detection means. 3. The ink jet recording apparatus according to claim 1. 6. The apparatus according to claim 1, further comprising a detection unit for detecting a temperature of the recording medium, and a control unit for controlling an oscillation output of the magnetron in accordance with a detection signal from the detection unit. 3. The ink jet recording apparatus according to 1 or 2. 7. The apparatus according to claim 1, further comprising a detecting unit for detecting the magnetism of the recording medium, wherein an oscillation output of the magnetron is controlled in accordance with a detection signal from the detecting unit.
Or the inkjet recording apparatus according to 2. 8. The image forming apparatus according to claim 1, further comprising a detecting unit for detecting a paper jam of the recording medium, wherein the oscillation output of the magnetron is controlled according to a detection signal from the detecting unit. Apparatus inkjet recording device.