JPH03272858A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To prevent a flow passage resistance in a supply system from becoming large becoming large despite of long time use by providing high voltage charging means adjacent to a first filter and a second filter. CONSTITUTION:At recording, a solenoid valve 62 is kept in open state, an ink is supplied to a common liquid chamber 52 due to the dead load from a supply tank 55 and led to a discharge opening 53 from the common liquid chamber 52 through a liquid passage. A first filter 70 and a second filter 80 prevent dusts from entering the common liquid chamber 52 together with the ink at recovery operation and recording. Also, first and second electrodes 71, 72 and a first high-pressure power source 73 and a first switch 74 crush the dusts caught by the filter 70 with a high pressure, and third and fourth electrodes 81, 82 and a second high-pressure power source 83 and a second switch 84 crush the dusts on the filter 80. The crushed dusts pass through the filters 70, 80 and are pushed out to the outside through the discharge opening 53, so that an increase of the flow passage resistance caused by the dusts accumulated at the filters 70, 80 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry] The present invention relates to an inkjet recording device, and particularly to an ink supply system that supplies ink to a recording head of the inkjet recording device.

[Prior Art] Conventionally, in an inkjet recording device, when ink is supplied from an ink supply tank to a recording head, fine dirt and dust contained in the ink enters the recording head and reaches the nozzle. The nozzle becomes clogged with the dirt and dust, and ink is not ejected from the nozzle.

Therefore, in order to prevent such non-ejection of ink, a mesh filter is provided in the middle of the ink supply system connecting the supply tank and the fishing record head to prevent the dirt and dust from entering the record head. I'm here.

[Problems to be Solved by the Invention] However, in the above conventional example, when the nozzle is reduced to, for example, 30 μmφ, the maximum length becomes 3
The above-mentioned mesh filter that can cut dust of 0 μm or more is required, but if such a mesh filter is installed in the middle of the ink supply system, the flow path resistance of the ink supply system becomes large, so the following procedure is required. There were some drawbacks.

(1) When filling with ink ejected from the nozzle, if the flow path resistance of the ink supply system is large, the filling speed becomes slow, resulting in a limit to the head driving speed.

(2) As described in Japanese Unexamined Patent Publication No. 60-247564, an infusible bottle 1 equipped with a bubble removing means (including a pump and a circulation supply channel) for removing bubbles in the ink supply channel. In a bulk recording device, if the flow path resistance of the ink supply path is large, it is necessary to drive the pump for a long time.k:
Therefore, it takes time to remove the bubbles.

The disadvantage is that the inkjet recording device cannot be used for a long time.
9.1 - When the mesh filter C is used, the detected dust accumulates and the mesh filter becomes clogged, which becomes apparent when the flow path resistance becomes large.

An object of the present invention is to provide an inkjet X-sheet recording device in which the flow path resistance of the ink supply system does not increase even after long-term use.

[Means to solve the problem]

The inkjet recording apparatus of the present invention includes a first filter hole provided at a predetermined position in a first ink path that supplies ink to the recording head and the ink cartridges x, y i- during the recovery operation. , a second filter provided at an arbitrary position in a second ink path that supplies the inkjet recording head E ink during recording; and @description 1.
and a high voltage applying means provided near the filter and the second filter, respectively.

Further, dust detection means is provided on the right near the first filter and the second filter, respectively, and a detection path of the dust detection means! Based on J, the high voltage application means is activated +! 1 is also good.

The recording head covers the entire recording area of the recording sheet! It may be a full line type in which t HD is formed.

Further, the recording head may eject ink from the ejector using thermal energy, and may include an electrothermal converter as the means for generating the thermal energy.
J, yes.

1. By providing a high voltage application means near the first filter, during the recovery operation &: the garbage trapped in the first filter E is pulverized by applying a voltage to it by the high voltage application means, Since the particles pass through the first filter and are removed from the nozzle of the recording head, the first filter's eyes are clogged with dirt, which increases the flow path resistance. In the same way, by providing a means for adding "visual attention" near the second filter, it is possible to prevent the eyes of the second filter from becoming clogged with dirt and increasing the flow path resistance during recording. can be prevented.

Further, dust detection means are provided in the vicinity of the first filter and the second filter, respectively, and the high voltage application means is operated based on the detection result of the dust detection stage. Since the application means is activated in accordance with the amount of time, the garbage can be pulverized efficiently.

FEmbodiment J Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an ink supply system of a first embodiment of the inkjet recording apparatus of the present invention, FIG. 2 is a schematic side view of the inkjet recording apparatus shown in FIG. 1, and FIG. 1 is a partially cutaway perspective view of the recording head 1. FIG.

The ink supply system to the recording head 1 in the inkjet recording apparatus of this embodiment includes a supply tank 55 that supplies ink (recording liquid) to the recording head 1, an air vent valve 63 provided in the supply tank 55, A main tank 56 for replenishing the supply tank 55 with ink. Replenishment rectifier valve 58
H. Recovery pump 1596 recovery rectifier valve 60 used during a recovery operation to recover the ejection function of the recording head 1
, a circulation pipe 61 which is a first ink path in which the recovery rectifier valve 60 is interposed, and the recording head 1 of the circulation pipe 61 which is an arbitrary position in the first ink path. a first filter 7 provided between the recovery rectifier valve 60;
C1, an ink valve 62ε used during recording operation, a supply pipe 57 which is a second ink path in which the electromagnetic valve 62 is installed, and a supply pipe 57 which is an arbitrary position in the second ink path; The second filter 80 provided between the recording head l of the tube 57 and the tTiri valve 62 is the same as the conventional one. However, a first electrode 71 and a second electrode 72 are provided on both sides of the first filter 70, and a third electrode 81 and a fourth electrode 82 are provided on both sides of the second filter 80, respectively. Also, a first electrode is connected to the first electrode 71 and the second electrode 72.
A high-voltage power source 73 is connected to the third electrode 81 and the fourth electrode 82 via a first switch 74, and a second high-voltage power source 83 is connected to the third electrode 81 and the fourth electrode 82 via a second switch 84. However, the conventional one ε is different.

Here, the recording head 1 has a common liquid chamber 52 and a common liquid chamber 5. It has a plurality of ink ejection ports (orifices) 53 arranged on an ink ejection port surface 54 . In addition, the discharge [ ] 53
are arranged in the entire printable width of the target recording sheet, and the ink is heated by selectively driving heating elements provided in the liquid paths (not shown) leading to the individual ejection ports 53. is ejected, and one line of recording is performed without main scanning of the recording radar 1 itself.

Next, the operation of this ink supply system will be explained.

During recording, the solenoid valve 62 is kept open, and ink is supplied from the supply tank 55 to the common liquid chamber 52 by its own weight. The ink is stored in the common liquid chamber 5.
2 to the discharge port 53 via a liquid path (not shown).

During a recovery operation performed to remove air bubbles remaining in the common liquid chamber 52 and the ink supply system and to cool the recording head 1, the recovery pump 59 is driven to pump ink to the circulation pipe 61.
At the same time, the ink is fed into the common liquid chamber 52 by driving the recording head 1 to push out air bubbles together with the ink from the ejection port 53. is returned to the supply tank 55 via.

At the time of initial filling of the liquid path, the solenoid valve 62 is closed, and the recovery pump 59 forces the ink into the common liquid chamber 52 through the circulation pipe 61, and as the bubbles are discharged, the ink is discharged from the discharge port 53. let

Here, the supporting filter 70 and the second filter 80 are used to prevent ink and dust from entering the common liquid chamber 52 during the recovery operation and during the recording.

Further, the first t-pole 71, the second electrode 72, the first high-voltage power supply 73, and the first switch 74, which are the features of the present invention, are as follows:
It is for crushing the dust caught in the first filter 7o by high pressure, and includes a third electrode 81, a fourth electrode 82, a second high EE power source 83, and a second switch 84.
is for crushing the dust caught in the second filter 80 using high pressure.

Next, the results of prototyping this ink supply system will be explained.

The nozzle of the recording head 1 has a height of 0.02 mm.

The width was 0.03 mm, the length was 045 mm, and 4736 pieces were arranged at a pitch of 400 DPI. The common liquid chamber 52 of the recording head 1 has a height of 2 mm and a width of 3 mm.

The length was 300 mrn. Supply pipe 57. The circulation pipe 61 is
The first filter 70 and the second filter 80ε are composed of polyethylene tubes with a diameter of 4 mm and a length of 500 mm.
The 0 recovery pump 59 is a gear pump that uses a mesh filter (for example, Rigimesh filter T11 grade) that completely removes dust of 18 μm or more, and its capacity is 1.0 atm for intravenous injection, no load. If the flow rate is 12 c
c/sec. First t-pole 71. Second t-pole 72. Third electrode 81. The fourth electrode 82 is formed into a mesh shape so as not to increase the flow path resistance.

The composition of the ink used is (weight ratio) diethylene glycol (DEG) 36% water
61% dye (FB-
2, etc.), and the viscosity of the ink is about 3.5 cp at 25°C.

Each of the first filter 70 and the second filter 80 is provided with a piezoelectric element touch sensor (not shown) to detect whether dirt in the ink is captured by the filter or not.

detecting with the piezoelectric element touch sensor that dust is caught in the first filter 70 during the recovery operation;
The first switch 74 is closed, a high voltage of several kilovolts is applied between the first electrode 71 and the second T-pole 72 by the first high-voltage power supply 73, and the voltage of the first filter 70 is applied. This will cause a spark discharge around the area. The dust is pulverized by the spark discharge, passes through the first filter 7°, and is completely pushed out from the discharge port 53. Therefore, it is possible to prevent dust from accumulating in the first filter 70 and increasing the flow path resistance. Second
The same applies to the filter 80.

Note that as the dust detection means, an optical sensor that monitors the filter surfaces of the first filter 70 and the second filter 80, respectively, may be used instead of the piezoelectric element touch sensor.

Alternatively, the dust detection means may be omitted, and at a predetermined timing C when the power is turned on, every predetermined number of recording sheets.

The first switch 74 and the second switch 84 may be closed at fixed intervals) or all the time, especially when the recovery pump 59
It is more efficient to synchronize the operation of

Further, one of the first electrode 71 and the second electrode 72 (the third electrode 81 and the fourth electrode 82) is removed, and the first
The filter 70 (second filter 80) may be made of a conductive member 7, and a high voltage may be applied between the filter and the electrode.

The first filter 7C1 and the second filter 80H are not limited to mesh filters; they may also be porous polymers (for example, Fluorobor T1' manufactured by Sumitomo Electric Industries, Ltd.), Also, the fineness of the two filters is not limited to the above numerical values.

First electrode 71. 2nd electrode 72° 3rd electrode 81, 4th 1! The pole 82 is not necessarily connected to the circulation pipe 61 and the supply pipe 5.
It is not necessary to arrange it in the ink flow path of 7.
For example, it may be arranged on the walls of the circulation pipe 61 and the supply pipe 57.

First high voltage power supply 73. The second high-voltage power supply 83 does not necessarily have to generate a voltage high enough to cause a spark discharge (it does not necessarily have to generate enough voltage to cause a current to flow through the garbage or the vicinity of the garbage). In this case, by applying a voltage to a large piece of garbage in which multiple pieces of garbage are intertwined, a current is passed through the large piece of garbage to cause slight vibrations or heat generation, and the two large pieces of garbage are crushed. .

Next, the operation of the entire inkjet recording apparatus of this embodiment will be explained with reference to FIG. 2. In FIG. They are of the bubble jet type and are fixed to block 2, corresponding to black, yellow, magenta, and cyan ink colors, respectively. Each of the recording heads 1+, lz, is, and 14 uses an electrothermal converter as a built-in ejection energy generating means, and ejects ink droplets from the ejection unit 53 using air bubbles generated in the ink when energized as a pressure source. It is something that makes
4736 ejection ports 53 are arranged at a density of 400DPI. In addition, each recording head 1+, 12.1s,
A reading head 51 is also fixed to the block 2 for detecting nozzle numbers 14 for ejection and non-ejection.

During non-recording, such as during standby, the block 2 is pulled up to the position shown by the dashed line in the figure, moved to the position shown by the broken line in the figure, and faced to the set capping unit 3, where it is capped.

The capping unit 3 operates when the recovery pump 591 and the recovery rectifier valve 60 shown in FIG. 1 are activated during circulation recovery. This serves as a receiver for waste ink fed through the circulation pipe 61 and pushed out from the ejection port 53, and the waste ink is guided to a waste ink tank (not shown).

An endless charged adsorption belt 4 for conveying the recording sheet 7 is attached to each recording head 18, 1□.

x, , x, are arranged so as to face each other at a predetermined distance from each other. Further, the back platen 5 connects each recording head In, 1* via a charging adsorption belt 4.

13 and 14 are arranged opposite to each other.

Paper cassette 6 containing recording sheets 7 such as plain paper
is attached to the main body of the inkjet recording apparatus. The pickup roller 8 feeds out only one recording sheet 7 on the top surface of the paper feed force jet 6, and the fed recording sheet 7 is transferred to the conveyance path 1 by the conveyance roller 9
0, and is sent via the transport roller 11 to the charging absorption bell L4.

heater 13 and fan] 4 is recording head x1.12
．． The ink droplets deposited on the recording sheet 7 at 1 s and la are dried and fixed by hot air. The discharge roller 15 is
The recording sheet 7 on which the fixing has been completed is discharged from the apparatus.

The tray 16 sequentially stocks the discharged recording sheets 7.

Next, the operation of the inkjet recording apparatus of this embodiment will be explained.

First, the recording operation will be explained. When an operation to start recording is performed, a recording sheet 7 of a specified size is sent out from the paper feed cassette 6 by a pickup roller 8. The fed-out recording sheet 7 is transported by a conveyance roller 9
．． Conveyance path 10. Through the conveyance roller 11, the charged adsorption belt 4, which rotates in a pre-charged state and is cut into a planar shape by the back platen 5, is placed.

The leading end of the recording sheet 7 is located at each recording head 11°1213.
．． 14, each of the recording heads 11, 12, 1. The energy heating element included in s and 14 is driven in accordance with image data by a drive circuit (not shown). Due to this driving, ink droplets corresponding to the image information are applied to each of the recording heads 1+, 12 . The image information is ejected from the ejection opening 53 of Is, 14 onto the surface of the cup recording sheet 7, and the image information is recorded.

If the recording sheet 7 has poor hygroscopicity, the ink droplets adhering to the surface will not dry and will be rubbed, causing print stains. Therefore, forced drying is performed using the heater 13 and fan 14 to fix the ink droplets. let The recording sheet 7 that has been fixed is discharged onto a tray 16 by a discharge roller 15.

Through the above operations, black, yellow, magenta, and cyan inks are recorded on the recording sheet 7.
, ], i , ig , 14 and attached by 1. A full color image is formed.

Next, the structure of the recording heads l+, 1g, 13, and 14 will be explained using FIG. 3.

This recording head 1 uses an electrothermal transducer as an energy generating means for heating a liquid and ejecting droplets.

This recording head 1 has one etching layer.

A plurality of electrothermal transducers 103 formed on a substrate 102 through a semiconductor manufacturing process such as sputtering,
It has a plurality of electrodes 104, a plurality of nozzle walls 105, and one top plate 106.

Recording ink is supplied from a supply tank 55 (see FIG. 1, 2) to a supply pipe 57. Board 1 via connector 109 for supply pipe
The ink supplied into the common liquid chamber 52 provided at the rear of each nozzle 11.0 on 02 is completely supplied into each nozzle 110 due to capillary action, and It is stably held by forming a meniscus at the discharge port surface 54 at the tip of the nozzles 1 and 10. this,! :,
When the electrothermal converter 103 is energized by the electrode 104, the ink on the electrothermal converter 103 is completely heated, a bubbling phenomenon occurs, and droplets are ejected from the ejection port 53 due to the energy of the bubbling. Here, the nozzles 110 are formed at a nozzle density of 4000 PI.

Next, an ink output method for a recording head generally used in an inkjet recording apparatus will be explained in section-7).

This type of recording head has a minute liquid outlet (orifice) and a liquid flow path. The liquid flow path includes an energy acting section provided in the liquid flow path, and an energy generating means for generating liquid temperature forming energy acting on the liquid in the energy acting section.

The energy generating means uses a recording method using an electromechanical transducer such as a piezo element, or a recording method using an electromechanical transducer such as a piezo element, or by irradiating and absorbing illumination magnetic waves such as a laser. There are two types of recording methods: a recording method that uses energy generating means to eject and fly a liquid, and a recording method that uses an energy generating means that heats the liquid with an electrothermal converter and ejects droplets. The recording head used in the inkjet recording method is capable of arranging liquid ejections 1 at high density for ejecting recording droplets and also forming flying droplets. In addition, a recording head using the electrothermal converter as a J6 energy generating means can be easily made compact, and has significantly improved reliability due to technological advances in the field of conductors. I
Since the advantages of C technology and high micro technology can be utilized in one and two ways, and it is easy to make it long and mountain-shaped (two-dimensional), it is easy to make multi-nozzles and 111i density packaging. Moreover, it is possible to provide an inkjet recording head that can be mass-produced and has a low manufacturing cost.

In this way, using an electrothermal converter as an energy generation means,
The recording head manufactured through the single conductor manufacturing process is
- Generally, when a plurality of fluid passages communicating with each liquid discharge are provided, liquid is supplied to each of the fluid passages from a common liquid chamber communicating with the valley fluid passage. A plurality of electrothermal transducers serving as a means for applying thermal energy to the liquid and ejecting the liquid from each liquid ejection L to form flying droplets are provided for each of the fluid paths. What's going on with the structure?

Next, a second embodiment of the inkjet recording apparatus of the present invention will be described. However, the inkjet recording apparatus of this embodiment has a first filter in the circulation pipe and a second filter in the supply pipe.
A dust detection means such as a photointerrupter with a transparent tube sandwiched therein is provided on the supply tank side of the soiler, and high voltage application means provided on the supply tank side of the two filters is applied depending on the detection result of the dust detection means. is operated to crush the dust before it is captured by the two filters.

In the inkjet recording equipment of this example,
Dust is trapped in the two filters, thereby eliminating the problem of increased flow path resistance.

The present invention brings about a slight advantage particularly in an inkjet recording apparatus using a bubble jet type recording head among inkjet recording types.

As for its typical structure and principle, C is preferably carried out using the basic principle disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. This method can be applied to any of the so-called 1-demand type, 2]ndini, and 1-as type, but in particular,
In the case of the ombremant type, the electrothermal converter placed in the sheet or liquid path that holds the liquid (ink) is heated rapidly to a temperature that exceeds nuclear boiling in response to the recorded information. By applying a drive signal of at least -.17 to give a rise of 17, thermal energy is generated in the electrothermal transducer, causing film boiling on the heat-active surface of the recording head, resulting in instantaneous response to this drive signal. This is effective because it can form air bubbles within the liquid (ink). Due to the growth and contraction of the bubbles, liquid (ink) is ejected through the ejection opening to form at least one droplet. By making this drive signal into a pulse shape, the growth and contraction of bubbles is carried out immediately and appropriately, so liquid (ink) ejection with particularly excellent responsiveness can be achieved. As the drive signal, U.S. Pat. No. 4,463,359,
The one described in the specification of the same No. 4345262 is suitable. Furthermore, if the conditions described in US Pat. No. 4,313,124 concerning the above-mentioned temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

The configuration of the recording head includes, in addition to the combined configuration of ejection ports, liquid paths, and air pressure converters (straight liquid path or right-angled liquid path) as disclosed in the above-mentioned specifications, as well as a heat-acting section. U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459 disclose a configuration in which the
A configuration using the configurations described in the specification of No. 600 may also be used. In addition, Japanese Patent Application Laid-Open No. 123670 of 1981 discloses a configuration in which a plurality of electrothermal transducers are carved and a common slit is used as a discharge part of the electrothermal transducers, and there is also a method for absorbing thermal energy and pressure waves. The present invention is also effective in the configuration based on Japanese Patent Application Laid-Open No. 138461 of 1982, which discloses a configuration compatible with an open-hole discharge section.

Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by an inkjet recording apparatus, a combination of a plurality of recording heads as disclosed in the above-mentioned specification can be used. Either a structure with a shorter length or a structure as a single recording head formed integrally may be used, but the present invention can exhibit the above-mentioned effects even more effectively.

In addition, a replaceable chip-type recording head that is attached to the device body enables electrical connection with the device body and ink supply from the device body, or a print head that is integrated into the recording head 0 body. The present invention is also effective when a cartridge type recording head is used.

Further, it is preferable to add recovery means, preliminary auxiliary means, etc. for the recording head, which are provided in the structure of the inkjet recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specifically, these include capping means, cleaning means, pressurizing or suction means, electrothermal transducers, or preheating by combining different heating elements or stiff straw for the recording head. It is also effective to carry out a preliminary ejection mode in which ejection is performed separately from recording in order to perform stable recording.

Furthermore, the recording mode of inkjet recording devices is not limited to recording only mainstream colors such as black.
Although the recording head may be configured integrally or by a combination of a plurality of recording heads, the present invention is also extremely effective in an apparatus having at least one of two different colors or a full color by mixing colors.

In the embodiments of the present invention described above, the ink is explained as a liquid, but it is an ink that solidifies at room temperature or below, softens or becomes a liquid at room temperature, or an ink that is generally used in inkjet. The ink may soften or become liquid within the temperature range of 30°C or more and 70°C or less, which is the temperature range of the temperature control. In addition, it is possible to actively prevent the temperature rise caused by thermal energy by using energy to change the state of the ink from a solid state to a liquid state, or to prevent the ink from evaporating. 1-1; / [A type of ink that uses ink that solidifies when left unused; in any case, the ink liquefies and is ejected as liquid ink by applying thermal energy in response to a recording signal, or a recording medium. The present invention is also applicable to the use of inks that are liquefied only by thermal energy, such as those that have already begun to solidify by the time the ink reaches the point where the ink is liquefied.
6847 or Japanese Patent Application Laid-Open No. 60-71260, a form in which the porous sheet is held as a liquid or solid in the recesses or through holes and faces the electrothermal converter. In the present invention, the most effective method for each of the above-mentioned inks is to perform the above-mentioned film boiling method.

[Effects of the Invention] Since the present invention is configured as described in 1.7, it produces the following effects.

By providing a high voltage applying means near the first filter, it is possible to crush the dust caught in the first filter during the recovery operation, so that the dust in the first filter can be removed. This has the effect of preventing the flow path resistance from increasing due to this. Similarly, the second
By providing a high voltage applying means near the filter, it is possible to prevent the eyes of the second filter from becoming clogged with dust and increasing the flow path resistance during recording.

Furthermore, dust detection means is provided near the first filter and the second filter, and the high voltage application means is activated based on the detection result of the dust detection means, thereby detecting dust. Since the high voltage application means can be activated depending on the amount, the dust can be efficiently pulverized.

[Brief explanation of drawings]

FIG. 1 shows an ink supply system of a first embodiment of the inkjet recording apparatus of the present invention, FIG. 2 is a schematic side view of the inkjet recording apparatus shown in FIG. It is a partially broken perspective view of the head 1. 1.1+, 12.13.14...recording head, 2...
- Cock, 3... Capping unit, 4... Charging adsorption belt, 5... Back platen, 6... Paper feed cassette, 7... R coupon, 8...
Pick-up roller, 9.1]... Conveyance roller, 10... Conveyance path, J3.
...Heater, 14...Fan, 15...Ejection roller, 16...E-ray, 51...Reading head, 52
...Common liquid chamber, 3...Discharge port, 54...Discharge 1'
-1, 5...supply tank, 56...main tank. 7... Supply pipe, 5B... Replenishment rectifier valve, 9... Recovery pump, 60... Recovery rectifier valve, 1... Circulation pipe,
62... Solenoid valve. 3.--Blowing valve, 7o...1st filter, 1.-
・First electrode, 72--Second electrode, 3--First high-voltage power supply, 4--First switch, 0--Second filter, 81--Third electrode Electrode, 2.
...Fourth electrode, 83...Second high voltage power supply, 4...
Second switch, 102... Substrate, 03... Electrothermal converter, 104... Electrode, 05... Nozzle wall, 10
6... Top plate, 09... Connector, 110... Nozzle.

Claims (1)

[Claims] 1. A recording head, a first filter provided at an arbitrary position in a first ink path that supplies ink to the recording head during a recovery operation, and a first filter provided to the recording head during recording. A second filter provided at an arbitrary position in a second ink path for supplying ink; and high voltage application means provided near the first filter and the second filter, respectively. An inkjet recording device characterized by: 2. Claim characterized in that it comprises dust detection means provided in the vicinity of the first filter and the second filter, respectively, and operates the high voltage application means based on the detection result of the dust detection means. The inkjet recording device according to item 1. 3. The inkjet recording apparatus according to claim 1 or 2, wherein the recording head is a full-line type in which ejection ports are formed over the entire width of the recording area of the recording sheet. 4. The recording head uses thermal energy to eject ink from the ejection ports, and is equipped with an electrothermal converter as means for generating the thermal energy. The inkjet recording device according to item 2 or 3.