JPH04128049A - Ink jet recording device - Google Patents

Abstract

PURPOSE:To contrive that an ink jet head with deteriorated recording characteristics may be restored to a normal condition by the trial discharge of a small amount of ink by providing a trial discharge device, capable of ink discharge for discharge recovery, which increases the amount of ink discharged from an ink discharge orifice near the end part of a common liquid chamber compared to the amount of ink discharged from an ink discharge orifice near the center. CONSTITUTION:A head cartridge 14 is fixed to the top of a carriage 15 by a fixed lever 41 and can move back and forth in a longitudinal direction along a shaft 21. Ink discharged from the discharge orifice of a recording head chip reaches a recording medium 18 with a recording surface restricted by a platen 19 arranged with a small space left to a discharge orifice and an image is formed on the recording medium 18. A discharge signal complying with image data from any appropriate data supply source is connected to a discharged energy generation element arranged on the recording head chip through cable 16 and a terminal connected to the former. Ink is easily discharged from an inflated part as time required for blank discharge for each nozzle is fixed, that is, the discharge amount of ink is large in a state where the ink is allowed to flow. Thus it is possible to restore an ink jet head with deteriorated recording properties to a satisfactory extent by trial-discharging a small amount of ink.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording device having a plurality of ink ejection ports.

[Conventional technology]

Generally, inkjet heads use ink that evaporates easily to some extent in order to improve ink fixability on a recording medium. For example, D with water as the main component
Water-based inks are used, which are made by adding appropriate amounts of pigments such as dyes and pigments to a solvent mixed with a non-volatile solvent such as EC. However, since such ink evaporates to some extent even within the inkjet head, it causes deterioration of recording characteristics such as non-ejection and density unevenness.

In order to prevent such deterioration of recording characteristics, there are two methods: suction recovery, in which the ink inside the nozzle is suctioned by a pump and forcibly discharged, and dry ejection (also called preliminary ejection, in which ink is ejected toward a cap, etc. in a non-printing area). ) and other recovery methods are used.

[Problem to be solved by the invention]

However, methods that forcefully discharge ink such as suction recovery require a large amount of ink to be forcibly discharged, so they may be used when recording has not been performed for a long period of time, or when foreign matter such as paper dust is stuck to the nozzle opening. This is an effective method for certain situations. However, since the time required for this recovery process is long, it is not preferable to perform it frequently during or before or after recording, as this will significantly reduce the recording speed. Furthermore, the large amount of discharged ink poses a significant disadvantage in terms of effective use of ink and disposal of discharged ink.

Therefore, idle ejection is often used to discharge ink in order to maintain an ejectable state or to prevent changes in concentration due to evaporation of the volatile solvent of the ink. In this case, the recording ejection frequency for each nozzle is random, but normally all nozzles perform dry ejection uniformly so that the recording characteristics can be reliably recovered.

In this case, since the idle ejection operation is uniformly determined assuming the worst nozzle condition, unnecessary idle ejection will be performed for the nozzles that are not in the worst condition. Therefore,
Inconveniences may occur in terms of effective use of ink, processing of ink that has been ejected in an idle manner, and time required for idle ejection.

By the way, in a multi-nozzle interjet head in which multiple nozzles are connected to a common liquid chamber for supplying ink, in order to eliminate the non-uniformity of ejection drive frequency characteristics for each nozzle due to ink supply characteristics during recording, The liquid chamber end is configured to be larger than the actual nozzle row width. In the above-mentioned inkjet head in which a plurality of nozzles are connected through a common liquid chamber, an internal volume with a certain amount of allowance is required at the end of the liquid chamber. Considering the case where the ink in that part evaporates, it is difficult to renew the ink due to idle ejection, and sufficient recovery processing cannot be performed.

On the other hand, it is possible to perform sufficient recovery processing by performing a large amount of dry ejection, but conversely, in the center of the nozzle row, the ink is easily refreshed by recording ejection or a small amount of dry ejection, so unnecessary This can be called empty discharge.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an inkjet recording device that can sufficiently recover an inkjet head whose recording characteristics have deteriorated with a small amount of idle ejection. .

[Means to solve the problem]

In order to achieve the above object, an inkjet recording apparatus of the present invention includes an inkjet head in which a plurality of ink ejection ports are connected by a common liquid chamber, and a blank ejection means for ejecting ink from the plurality of ink ejection ports for ejection recovery. In the inkjet recording device, the idle ejection means makes the amount of ink ejected from the ink ejection ports near the ends of the common liquid chamber larger than the amount of ink ejected from the ink ejection ports near the center. It is characterized by what it did.

[Effect]

According to the above configuration, since the amount of idly ejected ink is distributed, sufficient recovery processing can be performed with the minimum amount of ink, and ink can also be used effectively.

〔Example〕

Embodiments of the inkjet recording apparatus of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 and 2 are drawings showing the structure of an inkjet head used in the inkjet recording apparatus of the present invention, and are a sectional view and a top view, respectively.

In the same figure, 11 to 1.4 are electrothermal conversion elements for generating thermal energy by applying electric pulses, N
l”N14 is an ejection opening 21 for forming ink droplets;
214 are liquid passages communicating with the corresponding discharge ports N1 to N+4, and electrothermal conversion elements 11 to 114 are disposed therein, respectively. 3 is a common liquid chamber for storing ink supplied to each of the liquid paths 21 to 214.

When ink is discharged from the discharge port N by forced ink discharge means such as discharge or suction recovery, the ink is supplied from the ink supply section (not shown) to the common liquid chamber 3 and flows into the liquid path 2 as shown by arrow A. The liquid is discharged or discharged from the discharge port N as shown by arrow B.

If the recording device is left unused for a long period of time, ink may evaporate through the ejection port and the liquid chamber wall member that makes up the common liquid chamber, or the sealant between this and the head substrate containing the electrothermal conversion element. do. Evaporation increases the ink viscosity and ink concentration in the liquid path and near the walls of the common liquid chamber, making it difficult to eject normally after leaving it for a while, resulting in deviations in the ejection direction and amount, and even variations in image density. .

Therefore, as described above, idle ejection is generally performed in which ink is ejected in a non-printing state.

That is, all ink that has evaporated and changed in characteristics is discharged prior to printing and ejection.

FIG. 3 shows an example of printing without performing the above-mentioned idle ejection.

As shown in FIG. 3, at the beginning of ejection, high density occurs at all ejection ports due to ink evaporation, which gradually returns to normal as ejection continues. Here, it was found that the influence of ink evaporation is large at the end portions because a large number of ejections are required before the ink becomes normal, especially at the ejection ports at the end portions.

The following may be the reason for this. First, among the nozzle ends and the common liquid chamber, it is conceivable that the concentration of ink increases rapidly due to evaporation at the end of the common liquid chamber, which serves as an ink supply section to the nozzle ends.

Next, it is conceivable that the ink flow is weak at the ends, making it difficult for high-concentration ink to be discharged. Usually, as shown in Figure 2, the wall surface is slightly bulged in order to make the ink supply at the end less susceptible to the influence of the liquid chamber wall surface and to achieve uniform ejection characteristics. This is thought to be due to this. In other words, the ink in this bulge is difficult to flow. If high-density ink remains here, the influence on the ejection ports at the end will remain for a long time.

The present invention focuses on non-uniformity caused by the structure of a multi-nozzle head having a plurality of ejection ports and liquid paths, and is intended to prevent wasteful ink consumption during idle ejection.

FIG. 4 shows the idle ejection signal in the first embodiment of the present invention. In this embodiment, as shown in FIG. 4, the number of blank ejections is changed for each ejection port, with more at the ends (and less at the center).As a result, as shown in FIG. The amount of ink can be reduced to the minimum amount required for actual normalization as shown in FIG. 3, making effective use of ink possible.

Also, just change the number of empty discharges depending on the nozzle (,
Dry discharge control can also be easily performed.

Here, if the driving frequency of the electrothermal transducer, lk-4, 1k is the same as that during recording, the corresponding liquid path 2
This may be undesirable because bubbles within k-+ and 2k++ grow. Therefore, the adjacent discharge ports N
Ejection from k-+ N k++ is performed at a lower driving frequency than during recording. In this example, the driving frequency during recording is 4KHz, and the driving frequency for this bubble ejection is 2KHz.
The frequency is below KHz, preferably below IKHz.

FIG. 6 shows an example of the configuration of an inkjet recording apparatus that can perform the ejection recovery process shown in the first embodiment. Note that the present invention is similarly applicable to second to fourth embodiments to be described later.

In FIG. 6, 14 is a head cartridge, which integrates a recording head chip having an ink ejection port and a corresponding ejection energy generating element, and an ink tank serving as an ink supply source. . The head cartridge 14 is fixed on the carriage 15 by a holding member (fixing lever) 41, and these members can reciprocate in the longitudinal direction along the shaft 21. The ink ejected from the ejection ports of the recording head chip is
The recording medium 18 reaches the recording medium 18 whose recording surface is regulated by the platen 19 arranged at a minute interval from the ejection port, and the recording medium 18
Form an image on top.

Ejection energy generating element (
For example, an ejection signal corresponding to image data is supplied to the electrothermal transducer from an appropriate data supply source via a cable 16 and a terminal coupled thereto.

In FIG. 6, 17 is a carriage motor for operating the carriage 15 along the shaft 21;
2 is a wire that transmits the driving force of the motor 17 to the carriage 15. Further, 20 is a feed motor coupled to the platen roller 19 for conveying the recording medium 18.

25 is arranged, for example, at the home position of the carriage 15,
It is a cap member that can cover the ejection port forming surface of the head chip, and has the function of preventing ink near the ejection ports from drying and solidification accompanying this.

Further, a pump 30 is connected to the cap member 25 via the tube 4 in order to eliminate discharge failures.

When the pump 30 is driven to eliminate ejection failure, ink is suctioned from the ejection port by its suction force. In other words, in this example, ejection recovery processing using suction is performed in order to remove thickened ink or fixed ink from the ejection area during long periods of non-recording or when there are ejection ports that do not eject depending on the image. It is. The cap member 25 also includes a member for collecting ink to be ejected during the ejection recovery process.

Reference numeral 5 denotes a blade that is provided so as to be able to protrude from the recording head side, and by wiping the ejection orifice forming surface after ejection recovery processing, etc., removes wetting and dust such as paper powder on the ejection orifice forming surface. conduct.

FIG. 7 shows details of the recording head cartridge 14 according to the embodiment shown in FIG. 6, in which an ink tank serving as an ink storage member constituting an ink supply source and a recording head chip are integrated, and the cartridge is made disposable. It is a disposable type.

Here, 101 is a print head chip, which includes a plurality of adjacent ejection ports N formed on a surface facing the print medium, a plurality of mutually adjacent liquid paths (not shown) extending inwardly, and each liquid path. It has a discharge energy generating element such as an electrothermal converter (not shown) disposed in the same way, and a common liquid chamber (not shown) communicating with each liquid path. The supply tank unit 104 receives ink supply from the ink tank 110 side and transfers it to the recording chip 1.
It functions as a sub-tank that guides ink to the common liquid chamber in 01.

An ink absorber 112 is disposed within the ink tank 110 and is impregnated with ink, and can be formed using a porous material, fiber, or the like. 114 is an ink tank 110 lid member.

FIG. 8 is a block diagram showing the control configuration of the device shown in FIG. 6. With this control configuration, the above-described ejection recovery process can be controlled.

In FIG. 8, 200 is a CPU that executes signal processing for various controls in the device, and 20OA is a CPU 200.
R used as a work area etc. in the process execution of
AM1200B is a ROM that stores drive data, processing procedures, etc. when performing ejection as shown in the ejection recovery process of the above embodiment. During the ejection recovery process, the CPU 200 supplies the selection data of the ejection port that performs ejection, the pulse width data of the electric pulse, and the drive frequency data to the head driver 10IA, according to the processing procedure stored in the ROM 200B.

The CPU 200 also controls the carriage motor driver 17A and the paper feed motor driver 2OA as required for special recording purposes.
By supplying necessary data to the controller 10, the carriage motor 17 and the paper feed motor 2o are driven, and the movement of the carriage 15 and the paper feed of the recording paper are controlled.

Next, a second embodiment of the present invention will be described with reference to FIG.

This embodiment is an example in which the distribution optimization of the idle ejection amount was carried out by changing the idle ejection frequency as shown in FIG. 9, instead of the idle ejection time as in the first embodiment. In this example, the time required for dry ejection is approximately constant for each nozzle, that is, the amount of ejection at the ends is increased while the ink flow is generated in the center, so that This has the advantage that the ink can be easily discharged. Note that the idle ejection time and frequency may be selected as necessary, such as using the first embodiment for idle ejection before printing and the second embodiment for idle ejection when printing is interrupted.

Next, a third embodiment of the present invention will be described with reference to FIG. 10.

In this embodiment, in order to increase the amount of ejection per one ejection at the end, a short pulse (preliminary pulse) that does not cause ejection is applied as shown in Fig. 10 to further raise the ink temperature in a specific liquid path. It is. Further, another heating means may be provided at the end to obtain the same effect.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12.

In this embodiment, the distribution of the preliminary ejection amount is changed depending on the standing time, and FIG. 11 shows a table of the number of ejections from each nozzle with respect to the standing time. This embodiment focuses on the fact that the state of recovery of density uniformity shown in FIG. 3 differs depending on the standing time. In other words, this corresponds to the fact that the longer the standing time is, the greater the difference in ink concentration between the center and the edges becomes.

The operation of this embodiment will be explained with reference to the flowchart in FIG.

In the figure, when a print signal is received in step S1,
In step S2, the idle discharge timer is referred to.

This idle discharge timer measures the elapsed time t since the previous idle discharge, and indicates the time during which all nozzles have not discharged.

At step S3, time 1. ．． 12 and the elapsed time t to determine which time range T, . . . T2°T3 the elapsed time t falls within. The ejection number table shown in FIG. 11 is referred to based on the time ranges T, . After that, the idle discharge timer is reset in step S7, printing is performed in step S8, and then step S
Ends at 9.

According to the above embodiment, since the idle ejection is performed according to the standing time, more appropriate ejection recovery processing can be performed.

Note that the idle ejection timer may also be reset at the time of suction recovery as described above. This is because all the nozzles are ejecting in this case as well.

Note that, like the standing time in this embodiment, the variation in the ink concentration distribution is also related to the temperature of the ink, so the difference in the idle ejection amount distribution may be made larger as the temperature is higher.

Furthermore, in the case of character code printing, it is known that the frequency of ejection from the ejection ports at the end is statistically low.

Therefore, in consideration of this, it is effective to make the idle ejection amount at the end portion larger when printing character data than when printing image data.

Furthermore, the arrangement of the liquid paths with respect to the common liquid chamber is not limited to the upper side. For example, the present invention can be applied to a configuration in which a predetermined number of liquid path arrays form multiple layers and these liquid paths have a common common liquid chamber. In this case, the upper, lower, left, and right liquid By changing the preliminary ejection amount of ink in the liquid path, the high concentration ink in the liquid path can be efficiently discharged.

Also, the direction of the ejection surface of the recording head relative to the vertical direction
The present invention is effective in all cases, such as upward, downward, and horizontal orientation.

〔others〕

It should be noted that the present invention provides particularly excellent effects on recording heads and recording apparatuses of the bubble jet method proposed by Canon (I) among ink jet recording methods. This is because such a system can achieve higher recording density and higher definition.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. This method can be applied to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, it is necessary to arrange the liquid (ink) in accordance with the sheet and liquid path that hold it. The electrothermal converter that is
generating thermal energy in the electrothermal transducer to produce film boiling on the thermally active surface of the recording head by applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise above nucleate boiling; This is effective because it results in the formation of bubbles in the liquid (ink) that correspond to the drive signal in pairs. The growth and contraction of the bubble causes liquid (ink) to be ejected through the ejection opening to form at least one droplet. It is more preferable to use this drive signal in a pulse form, since the growth and contraction of bubbles can be carried out immediately and appropriately, making it possible to eject liquid (ink) with particularly excellent responsiveness. This pulse-shaped drive signal is:
U.S. Pat. No. 4,463,359, U.S. Pat. No. 4,345,26
Those described in Specification No. 2 are suitable.

Furthermore, if the conditions described in US Pat. No. 4,313,124 concerning the invention regarding the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be performed.

The configuration of the recording head includes, in addition to the combination configuration of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, a heat acting section. The present invention also includes configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose configurations in which the wafer is placed in a bending region. In addition, Japanese Patent Application Laid-Open No. 1989-5 discloses a configuration in which a common slit is used as a discharge part of a plurality of electrothermal converters.
No. 9-123670 and Japanese Patent Application Laid-Open No. 59/1989 which discloses a configuration in which a discharge portion is made to correspond to an opening that absorbs pressure waves of thermal energy.
The effects of the present invention are also effective even if the structure is based on the publication No.-138461. That is, regardless of the form of the recording head, according to the present invention, recording can be performed reliably and efficiently.

Furthermore, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium that can be recorded by a recording apparatus. Such a recording head may have either a configuration in which the length is satisfied by a combination of a plurality of recording heads, or a configuration as a single recording head formed integrally.

In addition, even if it is a serial type, the device main body 1.1
A fixed recording head, or a replaceable chip-type recording head that is attached to the device body to enable electrical connection to the device body and supply of ink from the device body, or a recording head like the one shown above. The present invention is also effective when using a cartridge type recording head in which an ink tank is integrally provided in the head itself.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus, to the present invention, because the effects of the present invention can be further stabilized. Specifically, these include a capping means for the recording head, a cleaning means, a pressure or suction means, a preheating means using an electrothermal transducer or a separate heating element, or a combination thereof; It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

In addition, regarding the type and number of recording heads installed, for example, in addition to one type that corresponds to single-color ink, there is also a plurality of recording heads that correspond to multiple inks with different recording colors and densities. It may be something that can be done. That is, for example, the recording mode of the recording apparatus is not limited to a recording mode for only a mainstream color such as black, but may also be a recording mode in which the recording head is configured integrally or in a combination of multiple colors, The present invention is also extremely effective for apparatuses equipped with at least one full-color image using a mixed color.

Additionally, in the embodiments of the present invention described above,
Although ink is described as a liquid, it is an ink that solidifies at room temperature or below, but softens or liquefies at room temperature, or in an inkjet method, the ink itself is
Generally, the temperature is controlled within the range of 0°C or more and 70°C or less so that the viscosity of the ink is within the stable ejection range. It suffices if it is in liquid form. In addition,
Either the temperature rise caused by thermal energy is actively prevented by using the energy to change the state of the ink from a solid state to a liquid state, or an ink that solidifies when left standing is used to prevent ink evaporation. In any case, the ink is liquefied by applying thermal energy in accordance with the recording signal, and the liquid ink is ejected, and the ink already begins to solidify by the time it reaches the recording medium.
The present invention is also applicable when using ink that is liquefied only by thermal energy. In such cases, the ink is held in a liquid or solid state in the recesses or through holes of the porous sheet, as described in JP-A-54-56847 or JP-A-60-71260. , it may also be in a form that faces the electrothermal converter. In the present invention, the most effective method for each of the above-mentioned inks is to implement the above-mentioned film boiling method.

In addition, the inkjet recording apparatus of the present invention may take the form of an image output terminal for information processing equipment such as a computer, a copying apparatus combined with a reader, etc., or a facsimile apparatus having a transmitting/receiving function. It may also be something.

FIG. 13 is a block diagram showing a schematic configuration when the inkjet recording apparatus of the present invention is applied to an information processing apparatus having functions as a word processor, a personal computer, a facsimile machine, and a copying apparatus.

In the figure, 1 is a control unit that controls the entire device, and is equipped with a CPU such as a microprocessor and various I10 ports, and outputs control signals and data signals to each part, and inputs control signals and data signals from each part. control. Reference numeral 2 denotes a display section, on which various menus, document information, image data read by the image reader 7, etc. are displayed. Reference numeral 3 denotes a transparent pressure-sensitive touch panel provided on the display section 2, and by pressing the surface with a finger or the like, it is possible to input items, coordinate positions, etc. on the display section 2.

4 is FM (Frequency Modulati
on) In the sound source section, music information created with a music editor or the like is stored as digital data in the memory section 10 or external storage device 12, and is read out from the memory or the like and subjected to FM modulation. The electrical signal from the FM sound source section 4 is converted into audible sound by the speaker section 5.

The printer unit 6 serves as an output terminal for a word processor, personal computer, facsimile machine, or copying machine.
The inkjet recording apparatus of the present invention is applied thereto.

Reference numeral 7 denotes an image reader unit that photoelectrically reads and inputs original document data, and is provided in the middle of the original conveying path, and reads various types of originals such as facsimile originals and copy originals.

Reference numeral 8 denotes a facsimile (FAX) transmitting/receiving unit which transmits document data read by the image reader unit 7 by facsimile, receives and decodes sent facsimile signals, and has an interface function with the outside. Reference numeral 9 denotes a telephone section having various telephone functions such as a normal telephone function and an answering machine function.

Reference numeral 10 denotes a memory section that includes a ROM for storing system programs, manager programs, other application programs, character fonts, dictionaries, etc., application programs and document information loaded from an external storage device 12, a video RAM, and the like.

Reference numeral 11 denotes a keyboard section for inputting document information, various commands, etc. Reference numeral 12 denotes an external storage device using a floppy disk, hard disk, or the like as a recording medium, and this external storage device 12 stores document information, music or audio information, user application programs, and the like.

FIG. 14 is an external view of the information processing apparatus shown in FIG. 13.

In the figure, 301 is a flat panel display using liquid crystal or the like, which displays various menus, graphic information, document information, etc. On this display 301 is a touch panel 3.
is installed, and by pressing the surface of this touch panel 3 with a finger or the like, coordinate input and item designation input can be performed. 302 is a handset used when the device functions as a telephone. A keyboard 303 is removably connected to the main body via a cord, and is capable of inputting various document information and various data. Further, this keyboard 303 is provided with various function keys 304 and the like. 305 is a floppy disk insertion slot into the external storage device 12.

Reference numeral 306 denotes a paper mounting section on which a document to be read by the image reader section 7 is placed, and the read document is discharged from the rear of the apparatus. Further, when receiving a facsimile, the information is recorded by an inkjet printer 307.

The display unit 2 may be a CRT, but is preferably a flat panel such as a liquid crystal display using ferroelectric liquid crystal. This is because it can be made smaller, thinner, and lighter.

When the information processing apparatus functions as a personal computer or a word processor, various information input from the keyboard section 11 is processed by the control section 1 according to a predetermined program and output as an image to the printer section 6.

When functioning as a receiver of a facsimile device, facsimile information input via a communication line through a communication line is received and processed by the control section 1 according to a predetermined program, and outputted to the printer section 6 as a received image.

In addition, when functioning as a copying device, the image reader section 7
reads the original, and the read original data is output as a copy image to the printer section 6 via the control section l.

In addition, when functioning as a transmitter for a facsimile machine,
The manuscript data read by the image reader section 7 is
After being subjected to transmission processing by the control unit 1 according to a predetermined program, the data is transmitted to the communication line as a FAX transmission/reception part.

By applying the inkjet recording device of the present invention to the multifunctional information processing device described above, high-quality recorded images can be obtained at high speed and with low noise, thereby further improving the functions of the information processing device. becomes possible.

〔Effect of the invention〕

As described above, according to the present invention, an inkjet head whose recording characteristics have deteriorated due to neglect or the like can be sufficiently restored with a small amount of idle ejection, so that ink can be used effectively.

[Brief explanation of drawings]

1 and 2 are a sectional view and a top view showing the configuration of an inkjet head used in the inkjet recording apparatus of the present invention, FIG. 3 is a diagram showing an example of recording by the inkjet head, and FIG. 4 is a diagram showing an example of recording by the inkjet head. A timing chart explaining the operation of the first embodiment; FIG. 5 is a diagram showing the distribution of the amount of blank ejection according to the first embodiment; FIGS. 6 to 8 are configuration diagrams of an inkjet recording apparatus applicable to the present invention. , a configuration diagram of an inkjet head, a control block diagram of an inkjet recording apparatus, FIG. 9 is a timing chart showing the operation of the second embodiment of the present invention, and FIG. 1O is a timing chart showing the operation of the third embodiment of the present invention. , FIG. 11 is a table showing the operation of the fourth embodiment of the present invention, FIG. 12 is a flowchart explaining the operation of the fourth embodiment, and FIGS. 13 and 14 are information processing to which the present invention can be applied. FIG. 2 is a control block diagram and a configuration diagram of the device. 1...Electrothermal conversion element 2...Discharge port 3...Common liquid chamber. 101... Recording head 200... CPU 200A... RAM 200B... ROM Fig. 1A Ejection rotor 11 /ρl

Claims (5)

[Claims] (1) An inkjet recording device comprising an inkjet head in which a plurality of ink ejection ports are connected by a common liquid chamber, and a dummy ejection means for ejecting ink from the plurality of ink ejection ports for ejection recovery, the dummy ejection means The inkjet recording apparatus is characterized in that the amount of ink ejected from the ink ejection ports near the ends of the common liquid chamber is larger than the amount of ink ejected from the ink ejection ports near the center. (2) The idle ejection means is characterized in that the ink ejection time for the ink ejection ports near the end portion is longer than the ink ejection time for the ink ejection ports near the center portion. inkjet recording device. (3) The idle ejection means is characterized in that the ink ejection frequency for the ink ejection ports near the end portion is higher than the ink ejection frequency for the ink ejection ports near the center portion. inkjet recording device. (4) The inkjet recording device according to claim (1), which is applied to a facsimile receiving device that records image data received via a communication line. (5) The inkjet head is provided for each corresponding ink ejection port, causes a state change in the ink due to heat, and based on the state change, ink is ejected from the ink ejection port to form flying droplets. The inkjet recording apparatus according to claim 1, further comprising thermal energy generating means for generating thermal energy.