JPH09123453A - Ink jet recording method, ink jet recording head and ink jet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the driving method by modulating the driving frequency to jet a next ink at the timing when the liquid level of ink is projecting above the surface of ink jet port. SOLUTION: When a pulse is applied under steady state (a) prior to jetting, jetting of main droplet is started to bring about a state (b) prior to liquid separation and a main droplet is jetted through a jet port 8 to bring about a state (c) immediately preceding liquid separation which is followed by a state (d) where the liquid level receded back to the jet port and a state (e) where the liquid level bulges above the jet port before returning back to the steady state (f). The driving frequency is modulated to jet a next ink at the timing when the liquid level of ink is projecting above the surface of ink jet port. Consequently, a third convenient driving method for head other than temperature regulation and pulse width modulation, can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method, an ink jet recording head and an ink jet recording apparatus for forming an image on a recording medium by ejecting ink from an ejection port of an ink jet recording head.

[0002]

2. Description of the Related Art One of image recording apparatuses for information communication equipment such as a printer, a plotter, a copying machine, a word processor, and a facsimile.
In recent years, a recording method using a recording head of an inkjet method has been evaluated and is widely and generally used. Especially bubbles generated by electrothermal converters
The method using pressure, that is, the bubble jet method (Japanese Examined Patent Publication No. 61-59911-4) is characterized in that the apparatus can be downsized and the image density can be easily increased.

The amount of droplets ejected by such an ink jet system (hereinafter referred to as the ejection amount) has a certain correlation with the temperature of the system on which the ink is ejected, that is, the temperature of the recording head. It is based on the well-known fact that when the temperature of the recording head is high, the viscosity of the ink is low and the ejection amount is large, and when the temperature of the recording head is low, the viscosity of the ink is high and the ejection amount is small. It is a thing.

Conventionally, the following methods have been adopted to control the discharge amount. That is, it is a method of setting the target temperature and adjusting the temperature of the head by means of means for detecting the temperature of the head and means for heating the head. As an example thereof, as shown in Japanese Patent Laid-Open No. 4-353467, in an inkjet recording apparatus having a plurality of recording heads, in order to make the ejection amount of at least one head larger than the ejection amounts of other heads, the ejection amount is There is a method of making the temperature control target temperature of the head to be raised higher than other heads.

Alternatively, there is a method of performing pulse width modulation (PWM) for applying a voltage to the head. As one example thereof, as shown in Japanese Patent Laid-Open No. 5-169659, a pre-driving pulse that does not lead to the ejection of ink and a main driving pulse that leads to the ejection of ink are ejected through an idle period per ejection of an ink drop. There is an inkjet recording apparatus that has a driving unit that supplies a recording head to a recording head and a unit that controls the pause period, and controls the ejection amount by changing the pause period.

[0006]

However, recent demands for ink jet recording systems are high-speed printing, high-definition images, large-format continuous printing, etc., but downsizing of recording devices, cost reduction, and low running are also required. Costs are becoming high. The structure of the recording head for responding to at least one or more of these requirements is, for example, 256, 51 or more of the existing 64 or 128 nozzles.
2, the number of nozzles such as 1024 nozzles has been greatly increased, and the current 360 or 400 DPI
From 600 to 1200 DOI, and as a recording method, it is possible to increase the driving frequency.

[0007] Such a requirement gives a considerable restriction to the above-mentioned discharge amount control means. That is, with respect to the means for adjusting the temperature of the head, more energy than before has to be applied for heating due to the increase in the number of nozzles in the head, and the waiting time (wait time) until the target temperature for temperature increase is reached. As a result, since it is necessary to instantaneously pass a large current, the power supply of the recording device, the cable, and the like cannot be downsized, which leads to an increase in cost.

Further, in a recording device such as a large-format printer corresponding to the numbers A1 to A0, the width of one scan during printing is large, so that the self-heating is intense due to the ejection, and the limit temperature is set so that the head is not destroyed by overheating. However, if the printing is stopped when the temperature rises to the limit temperature, the printing must be stopped frequently because the difference between the temperature increase target temperature at the start of printing and the limit temperature cannot be sufficiently obtained.

Regarding the control of the pulse width, when the drive frequency is increased in order to perform high speed printing,
The higher the drive frequency is, the shorter the total time during which voltage can be applied per discharge is shortened. Similarly, when the number of nozzles increases, the total time per ejection also decreases. Even if it is confirmed that the ejection amount increases if the pulse width is increased to a certain value, there is a possibility that the target ejection amount cannot be achieved because the total time in which the voltage can be applied cannot be reached.

In view of this, the present invention proposes a third simple driving method other than head temperature adjustment and pulse width modulation, and is used as a power source in an ink jet recording apparatus, especially in a large-format printer / plotter having a wide width of one scan. In addition to suppressing the increase in size, suppressing the temperature rise of the head without pausing printing, and increasing the ejection rate as needed while performing printing as fast as possible without being restricted by the pulse width. Accordingly, it is an object of the present invention to provide an inkjet recording method capable of improving printing density and achieving high printing quality.

[0011]

In order to achieve the above object, the present invention has the following arrangement.

An ink ejection port for ejecting ink, a liquid passage communicating with the ink ejection port, and a liquid passage provided in the liquid passage, and
An inkjet recording method using an inkjet recording apparatus including an inkjet recording head having an element that generates ejection energy used to eject ink, and a control mechanism that controls a drive frequency of the inkjet recording head. The liquid level of the ink generated at the ink ejection port of the inkjet recording head changes with time after ejection, and the next ink ejection is performed at the timing when the liquid level of the ink protrudes from the ink ejection port surface. In addition, the inkjet recording method of modulating the driving frequency, or the ejection energy generating element,
An ink jet recording method that is a heating element that discharges ink by generating bubbles due to film boiling phenomenon in the ink, or when the liquid surface generated at the ink discharge port is refilled after the ink is discharged and first returns to the initial steady state. the refill frequency is f _r, the refill frequency when returning to the next steady-state when the f _0, the f _r when subjected to ordinary printing at the f ₀ frequencies below, increasing the ink ejection amount And an ink jet recording method in which printing is driven at a frequency between f ₀ and the ink jet recording head has temperature adjusting means, and the drive frequency is modulated in association with temperature adjustment by the temperature adjusting means. An inkjet recording method, or an ink ejection port for ejecting ink, a liquid path communicating with the ink ejection port, and the liquid path, An ink jet recording head having an element for generating ejection energy used for ejecting ink, wherein an opening area of the ink ejection port is 350 to 800 μm ² , and the ejection energy generating element has a rectangular shape. The short dimension is 20 ~
40 μm, the longitudinal dimension is 100 to 150 μm, the ejection energy generating element is provided on a substrate that constitutes a part of the liquid path, and the end of the substrate from the end on the ink ejection port side is the The distance to the end of the ejection energy generating element is 0.07 to 0.12 mm, and the length of the liquid path from the end of the substrate on the ink ejection port side is 0.2 to 0.5.
mm, and the height of the liquid path from the substrate surface is 40
The ink jet recording head having a thickness of ˜50 μm, or the opening area of the ink ejection port is 500 to 600 μm
^The inkjet recording head of ² or the ejection energy generating element has a rectangular shape with a lateral dimension of 26 to 30 μm and a longitudinal dimension of 110 to 120.
The ink jet recording head having a size of μm or the ejection energy generating element is provided on a substrate forming a part of the liquid path, and the ejection energy generating element of the substrate is connected to an end portion on the ink ejection port side. The distance to the end is 0.08 to 0.09 mm, and the length of the liquid path from the end of the substrate on the ink ejection port side is 0.25 to 0.35 m.
m, and the height of the liquid path from the surface of the substrate is 42 to
45 μm inkjet recording head, or
An inkjet recording method using an inkjet recording head, or an inkjet recording apparatus including an inkjet recording head and a control mechanism for controlling a driving frequency of the inkjet recording head, or the inkjet recording head in a transport direction of a recording medium. The inkjet recording device is detachably mountable on a carriage that reciprocates in orthogonal directions.

According to the present invention, the ejection amount can be increased as necessary regardless of the restriction on the pulse width when performing high-speed printing and the head temperature rise in a large format printer / plotter. It is possible to realize an inkjet recording method for obtaining a high-quality image with high print density.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the inkjet recording device will be described.

[Embodiment 1] FIG. 1 is a schematic view showing an example of an ink jet recording apparatus according to the present invention. In FIG. 1, 1 is an ink jet recording head, 2
Is a carriage that fixes the ink jet recording head on the apparatus and enables electrical connection when the head is fixed on the apparatus. Further, 3 is a recording medium such as paper on which recording is performed, and is conveyed by a platen 4 in a direction perpendicular to the scanning direction of the inkjet recording head 1. Reference numerals 5 and 6 denote shafts for the carriage 2 to scan, and the rotation of the shaft 5 causes the carriage 2 to move.

FIG. 2 is a block diagram showing the configuration of the control circuit 100 of the ink jet recording apparatus. In FIG.
Reference numeral 108 denotes an interface for inputting a recording signal, 101
Is an MPU, 102 is a ROM that stores a control program executed by the MPU 101, and 103 is a DRAM that saves various data (the above-described recording signals and recording data supplied to the inkjet recording head 1). Reference numeral 104 denotes a gate array (GA) for controlling supply of print data to the print head 1, and interfaces 108, M
It also controls the data transfer of the PU 101, the DRAM 103, and the like. Reference numeral 110 denotes a carriage motor for scanning a carriage 2 on which the inkjet recording head 1 is mounted, and 1
Reference numeral 09 is a conveyance motor for conveying the recording medium. 10
Reference numeral 5 is a head driver for driving the inkjet recording head 1, and 106 and 107 are motor drivers for driving the carry motor 109 and the carriage motor 110, respectively.

The operation of the control circuit 100 will be described below.
When a recording signal is input to the interface 108, the recording signal is converted between the gate array 104 and the MPU 101 into recording data for printing. The motor drivers 106 and 107 drive the carry motor 109 and the carriage motor 110, and the head driver 105.
The ink jet recording head 1 is driven and recording is performed according to the recording data sent to.

Further, the control circuit 100 controls the display device 111 for informing the user of the printer status and the mode changeover switch 112 for allowing the user to select the print density and the like.

Next, the ink jet recording head will be described. FIG. 3 is a perspective view showing an example of its appearance. 7
Is an ink tank for storing ink, 8 is a plurality of ejection ports for ejecting ink, 9 is an ink supply member, and 10 is a printed wiring board (PW) connected to a heating element (not shown).
B) and 11 are contact pads electrically connected to the apparatus side on the carriage, and 12 is a base plate on which the above-mentioned components are mounted.

Further, the details of the ink discharge area will be described.
FIG. 4 is an enlarged cross-sectional view including an ink liquid path for ejecting ink and a configuration necessary for ejection. In FIG. 4, reference numeral 13 denotes a substrate (hereinafter referred to as a heater board) on which a plurality of heating elements 14 for foaming and ejecting ink are formed, and electrically connected to the PWB 10 by wires 15. Reference numeral 20 denotes a top plate for forming a plurality of ejection ports 8 and ink liquid passages 16 for ejecting ink, and for forming a common liquid chamber 17 commonly communicating with the plurality of ink liquid passages 16.

A filter 19 is provided at the end of the ink supply path 18 that connects the inside of the ink tank 7 serving as the ink storage portion with the common liquid chamber 17 in the recording head on the ink tank side.
Is provided. Here, from the ink tank 7 to the top plate 2
The ink path to the ejection portion formed by 0 is as shown by an arrow F in the figure that passes through the ink supply path 18 and the common liquid chamber 17.

Next, the ejection behavior will be described. FIG.
(A)-(f) is explanatory drawing which shows the behavior of the meniscus before and after discharge of a droplet in the cross-section structure of the discharge port 8 of this embodiment, and the ink liquid path 16 connected to it. FIG. 5 shows a heater board 1 having a heating element for ejecting ink.
3, a discharge port forming surface 21 having a discharge port 8, an orifice 22 communicating with the discharge port forming surface 21, a liquid passage 23, and a taper portion 24 forming the liquid passage.

Next, the behavior of the liquid surface existing near the outlet of the ejection port 8 or in the ink liquid path 16 before and after the ejection will be described. When the change in the liquid level after the pulse is applied is changed from the steady state before ejection shown in FIG.
(B) is the state before the liquid separation after the start of the main droplet ejection, (c) is the state before the main droplet is ejected from the ejection port 8, immediately before the liquid separation, (d) is the retracted liquid surface returned to the ejection port The state, (e) shows that the liquid surface rises from the discharge port, and (f) shows that the liquid surface returns to the steady state again. The behavior of the liquid surface after the discharge is a damping vibration in which the amplitude becomes smaller while repeatedly rising and retracting.

FIG. 6 is a diagram showing the displacement of the ink surface at the ejection port 8 shown in FIG. 5 together with the time after the application of the ejection pulse. In the figure, t _r (sec) is the time until the liquid separation in FIG. 5 (c) (the liquid surface in FIG. 3 returns to a steady state, and this is called the refill time.
_After returning to the steady state at _r , and further rising in the discharge direction (Fig. 5 (e)), the time to return to the steady state is t ₀ (Fig. 5).
(F)) The time for returning to the steady state again after the liquid level recedes is t ₁ .

In FIG. 7, the horizontal axis of FIG. 6 is replaced with the frequency f = 1 / t (Hz) from time t (sec). Here referred to as a refill frequency of 1 / t _r to refilling time t _r, which represents at f _r (Hz), 1 with respect to t ₀
/ A t ₀ f _0, a t ₁ with respect to 1 / t ₁ and f _1. Each numerical value has a unique value for each type of recording head, such as fluid resistance which varies depending on the structure such as the length and height of the liquid passage, the size of the ejection port, and the resistance of the ink supply passage.

Next, the relationship between the state of the liquid surface and the discharge amount will be described.

FIG. 8 shows the frequency dependence of the discharge amount. The horizontal axis represents the drive frequency of the recording head, and the vertical axis represents the ejection amount when ejecting at each frequency. The discharge amount increases / decreases corresponding to the liquid surface position in FIG. 7, and the discharge amount is stable since the vibration of the liquid surface is almost subdued at f ₀ to f ₁ or less, but f _r and f ₀ During the interval, since the ejection is performed with the liquid level rising, there is a peak of the ejection amount in the state where the liquid level is projected most than the stable ejection amount of f ₁ or less.

Next, the relationship between the drive frequency and the actual ejection frequency for each pattern will be described.

The actual ejection frequency of each nozzle differs depending on the pattern to be printed, and the drive frequency f _op during continuous ejection.
When 1 dot is hit and 1 dot rests (hereinafter referred to as 1 dot 1 space), 1/2 of f _op , 1 dot n
In the case of space, it becomes 1 / (n + 1) of f _op .

In order to obtain a uniform discharge amount in any print pattern, as shown in FIG. 9A, the drive frequency f _op
Some also set to f ₁ below, in this case the driving frequency f _op can not support high-speed printing order to be kept low.

Therefore, in order to increase the printing speed, FIG.
There is a method of setting f _op around f _r as shown in FIG. At this time, if f _op / 2 is less than or equal to f ₀ or f ₁ , the discharge amount for each pattern can be kept constant and the driving frequency can be set high, so high-speed printing can be achieved, and Prints at such a drive frequency (f _J ).

In a low-temperature and low-humidity environment, etc., the ejection amount decreases as the head temperature decreases. At this time, however, there is a tendency that a particularly thin density is recognized in a 100% solid area. This is because the ejected liquid droplets are small, so the solid area that can be completely covered by the originally set ejection amount is not filled with ink, and the substrate of the recording medium is visible. Image density decreases.

Depending on the type of recording medium, the bleeding of the ink on the medium differs, so that the solid area is not completely covered even with the same ejection amount, and the image density is similarly reduced. There are cases.

Therefore, a method of increasing the density of the solid portion of 100% implantation will be described.

As shown in FIG. 9 (c), in order to increase the discharge amount of the solid portion of the implant 100%, depending on the necessary amount of increase, refill frequency f _r and the raised liquid surface after refilling again constant A frequency between the frequency f ₀ of returning to the state and the driving frequency f _op may be selected.

FIG. 10 is a flowchart thereof. After the recording device receives the print signal (S1), the head temperature T _h
Recognizes (S2), the T _h is lower than room temperature (23 ° C.), when it is below a certain temperature T _L (S3), the driving frequency f _op is in response to said increase of the required ejection liquid f _r And f ₀
Select f _L between (S4) and start printing (S4).
5). On the other hand, in the case where the head temperature _Th is higher than _TL, if the user of the recording apparatus selects a dark print density according to the recording medium (S6, mode selection), f _op is f Select _L (S4), but if the user has not selected a dark print density, select f _J (S4).
7) Printing starts respectively (S5). In all cases, the ejection amount is controlled by repeating the same sequence for each line printing.

In this embodiment, the so-called edge shooter type head having the discharge port 8 at one end of the liquid passage 16 provided in the direction along the surface of the heating element 14 has been described, but the present invention is not limited to this. It is also applicable to a so-called side shooter type head having an ejection port at a position facing the surface of the heating element.

[Embodiment 2] Next, specific numerical values such as the ejection amount and print density when the refill frequency f _r or f ₀ and f _{op described above} are changed will be described. It will be specifically described in Section 2.

First, the structure of the discharge ports, orifices, liquid paths and the like of the ink jet recording head of the present invention and the dimensions of the heating elements will be described in detail.

FIG. 11A is an enlarged cross-sectional view including each component of the ink jet recording head such as a discharge port, an orifice, a liquid path, and a heater board, and FIG. 11B is a plan view showing a part of the heater board. 11 (c) is a view showing the ejection port from the direction of arrow A in FIG. 11 (a). FIG.
In (a), the heater board 13 including the heating element 14
Of these, the distance from the end on the discharge port 8 side to the end of the heating element is called the EH dimension. This EH dimension is preferably 0.07 to 0.12 mm, and more preferably 0.08 to 0.09 mm in this embodiment. Further, the heating element (heater) as the discharge energy generating element is shown in FIG.
As shown in (b), it is rectangular and its longitudinal dimension is L
_1, when the short edge size and L _2, L ₁ is preferably 100
˜150 μm, more preferably 110 to 120 μm, or L ₂ is preferably 20 to 40 μm, more preferably 26 to 30 μm. As shown in FIG. 11A, the liquid passage length represents the distance from the tip on the heater board discharge port side to the rear end of the liquid passage, preferably 0.2 to 0.5 mm,
More preferably, it is 0.25 to 0.35 mm. FIG.
As shown in (a), the height of the liquid passage defines the distance from the surface of the heater board to the ceiling of the liquid passage, preferably 40 to 5
It is 0 μm, more preferably 42 to 45 μm. FIG.
As shown in (c), the discharge port has a substantially circular shape, and the area thereof is preferably 300 to 850 μm ² , and more preferably 500 to 600 μm ² .

[0041] In the recording head having such a configuration, the refill frequency f _r as defined in embodiment 1 10 kHz
The frequency f ₀ was around 5 kHz, where the liquid level rose to a steady state after rising. As an example of the ejection amount and the optical reflection density when the drive frequency f _op of the recording head is changed, the ejection amount 55 when f _op = 10 kHz.
In ng, the reflection density is 1.11 and f _op = 8 kHz
When the discharge amount was 60 ng, the reflection density was 1.15, and when f _op = 6.75 kHz, the discharge density was 65 ng and the reflection density was 1.18. That is, when applying the present invention,
Usually, when the driving frequency is set to f _op = 10 kHz, high-speed printing is performed, and when it is necessary to increase the ejection amount depending on the change of the printing environment or the type of recording medium, the driving frequency may be set, for example. A desired ejection amount can be obtained by changing f _op = 8 kHz and further 6.75 kHz.

Of course, each numerical value is determined by the value of each type of recording head, such as the fluid resistance which varies depending on the structure such as the length and height of the liquid passage, the size of the ejection port, the resistance of the ink supply passage, and the like. However, the present invention is not limited to this embodiment, and any numerical value can be applied as long as the effects of the present invention can be exhibited.

[Embodiment 3] In the third embodiment of the present invention, a method for modulating the driving frequency and a means for adjusting the temperature of the head are used together. After the head temperature is detected, the target temperature is set according to the temperature and the temperature is adjusted, and the drive frequency is changed as necessary, so that finer ejection amount adjustment is possible.

FIG. 12 shows the relationship between the temperature adjustment temperature and the discharge amount for each drive frequency. The horizontal axis represents the temperature adjustment temperature and the vertical axis represents the discharge amount. When the temperature is adjusted to the same temperature adjustment temperature, for example, 45 ° C., the discharge amount at 10 kHz is 5
Discharge rate at 5 ng and 8 kHz is 60 ng and 6.75 kHz
The discharge amount at z is 65 ng. Further, at each frequency, when the temperature adjustment temperature is raised, the discharge amount increases. For example, when the target value of the discharge amount is 55 ng, the temperature adjustment temperature is
Different for each frequency. It becomes 45 ° C. at 10 kHz, 32 ° C. at 8 kHz, and 25 ° C. at 6.75 kHz. That is, when the method of modulating the drive frequency and the head temperature adjustment are used together, the printing is started at 6.75 kHz without adjusting the temperature from the state of the head temperature 25 ° C. at room temperature 25 ° C., and the head temperature reaches 32 ° C. Switch to 8 kHz drive when the temperature reaches, and 10 kHz when the head temperature reaches 45 ° C.
It can be switched to z drive. At this time, when the print duty is relatively high, the head temperature may be raised only by the self-heating by printing, or when the print duty is low and the self-heating is small, the temperature may be adjusted together.

The same sequence is also possible when the user of the recording apparatus selects a high print density according to the recording medium. For example, when the target value of the ejection amount is 60 ng, the head is heated to 34 ° C. by adjusting the head temperature, printing is started at 6.75 kHz driving, and 8 kHz driving is performed when the head temperature reaches 45 ° C. When switching, and when the head temperature reaches 60 ℃, 10kH
Switch to z drive.

By such a method, the wait time until the start of printing can be minimized, and finer discharge amount adjustment can be performed.

[0047]

As described above, according to the present invention,
In the case of using a normal environment or a normal recording medium, driving at a driving frequency f _op as high as possible to improve the printing speed, and when the head temperature is lower than a certain temperature lower than room temperature. And, only when the user selects a high print density, the drive frequency is modulated to control the ejection amount to increase the solid part density of 100% ejection, thereby making it possible to obtain a high-quality image. A recording head and device can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic external view showing an example of an inkjet recording apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of a control circuit of the inkjet recording apparatus according to the present invention.

FIG. 3 is an external view showing an example of an inkjet recording head according to the present invention.

FIG. 4 is an enlarged cross-sectional view showing an example around the ink ejection of the inkjet recording head according to the present invention.

5A to 5F are cross-sectional views showing displacement of the liquid surface before and after ejection of the inkjet recording head according to the present invention.

FIG. 6 is a diagram showing a time characteristic of a liquid surface displacement of the inkjet recording head according to the present invention.

FIG. 7 is a diagram showing frequency characteristics of liquid surface displacement of the inkjet recording head according to the present invention.

FIG. 8 is a diagram showing a frequency characteristic of an ejection amount of the inkjet recording head according to the present invention.

9A to 9C are diagrams illustrating the relationship between the frequency characteristic of the ejection amount and the drive frequency of the inkjet recording head according to the present invention.

FIG. 10 is a flowchart showing a sequence as an exemplary embodiment of the present invention.

11A and 11B are diagrams showing an example of the vicinity of ink ejection of an inkjet recording head according to the present invention, in which FIG. 11A is an enlarged sectional view, FIG. 11B is a plan view of a heating element, and FIG. is there.

FIG. 12 is a graph showing the relationship between the temperature adjustment temperature and the ejection amount for each drive frequency in the inkjet recording head according to the present invention.

[Explanation of symbols]

 1 Inkjet recording head 2 Carriage 3 Recording medium 4 Platen 5, 6 Shaft 7 Ink tank 8 Ejection port 9 Ink supply member 10 Printed wiring board (PWB) 11 Contact pad 12 Base plate 13 Heater board 14 Heating element (ejection energy generating element) 15 wire 16 ink liquid passage 17 common liquid chamber 18 ink supply passage 19 filter 20 top plate 21 discharge port forming surface 22 orifice 23 liquid passage 24 taper portion 100 control circuit

Claims (11)

[Claims] 1. An ink ejection port for ejecting ink, a liquid channel communicating with the ink ejection port, and an element provided in the liquid channel for generating ejection energy used for ejecting ink. An ink jet recording method using an ink jet recording apparatus comprising: an ink jet recording head having: and a control mechanism for controlling a driving frequency of the ink jet recording head, wherein an ink liquid generated at the ink ejection port of the ink jet recording head. The surface changes with time after ejection,
An ink jet recording method, characterized in that the drive frequency is modulated so that the next ink ejection is performed at the timing when the liquid surface of the ink is projected from the ink ejection port surface. 2. The ink jet recording method according to claim 1, wherein the ejection energy generating element is a heating element that ejects the ink by generating bubbles due to a film boiling phenomenon in the ink. 3. The refill frequency when the liquid surface generated at the ink ejection port is refilled after the ink is ejected and first returns to the initial steady state is defined as f _r, and the refill frequency when returning to the next steady state is defined as f _r. when the f _0, performs normal printing in the f ₀ frequencies below, claims, characterized in that the printed driven at a frequency between the f _r and the f ₀ when increasing the ink ejection amount 3. The inkjet recording method according to 1 or 2. 4. The ink jet recording head has a temperature adjusting means, and the driving frequency is modulated in conjunction with the temperature adjustment by the temperature adjusting means. Inkjet recording method according to item. 5. An ink ejection port for ejecting ink, a liquid path communicating with the ink ejection port, and an element provided in the liquid path for generating ejection energy used for ejecting ink. An ink jet recording head having: an opening area of the ink ejection port is 350 to 800 μm ² , the ejection energy generating element has a rectangular shape, and a lateral dimension thereof is 20 to 40 μm, and a longitudinal dimension thereof is 1
0 to 150 μm, the ejection energy generating element is provided on a substrate forming a part of the liquid path, and from the substrate, from the end on the ink ejection port side to the end of the ejection energy generating element. Is 0.07 to 0.12 mm, the length of the liquid passage from the substrate end portion on the ink ejection port side is 0.2 to 0.5 mm, and the length of the liquid passage from the substrate surface is An ink jet recording head having a height of 40 to 50 μm. 6. The opening area of the ink ejection port is 500 to
The inkjet recording head according to claim 5, wherein the inkjet recording head has a thickness of 600 μm ² . 7. The inkjet according to claim 5, wherein the ejection energy generating element has a rectangular shape, a lateral dimension thereof is 26 to 30 μm, and a longitudinal dimension thereof is 110 to 120 μm. Recording head. 8. The ejection energy generating element is provided on a substrate forming a part of the liquid passage, and from the substrate, an end portion on the ink ejection port side to an end portion of the ejection energy generating element. The distance is 0.08 to 0.09 mm, and the length of the liquid path from the substrate end portion on the ink ejection port side is 0.
The inkjet recording head according to any one of claims 5 to 7, wherein the height is 25 to 0.35 mm, and the height of the liquid path from the surface of the substrate is 42 to 45 µm. 9. An inkjet recording method using the inkjet recording head according to any one of claims 5 to 8. 10. An inkjet recording apparatus comprising: the inkjet recording head according to claim 5; and a control mechanism for controlling a drive frequency of the inkjet recording head. 11. The ink jet recording apparatus according to claim 10, wherein the ink jet recording head is detachably mountable on a carriage that reciprocates in a direction orthogonal to a conveyance direction of a recording medium.