JPH03234636A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To prevent dispersion of discharge for each discharge opening by a method wherein discharge of ink to be discharged from a plurality of discharge openings is detected, and an electric signal to be given to a recording head is corrected according to said result. CONSTITUTION:Discharge opening (a) to (d) are filled with ink of specific condition common thereto (approx. 3cp in viscosity), and drive of specific pulse widths (4.5mus, 5.0mus,...7.0mus) is performed at specific voltage (approx. 25V). In that case, a difference appears according to a discharge characteristic of each discharge opening. The discharge opening (a) requires the maximum energy for discharge, and energy of the discharge opening (d) is the minimum among four discharge openings. Then, when ink viscosity is 3cp, ink is discharged for voltage impressing time of 5.0mus or longer with the discharge opening (d) and is discharged for voltage impressing time of 6.5mus or longer with the discharge opening (a). Such a difference in a discharge characteristic of each discharge opening is detected, and a drive condition is varied independently for each heating element corresponding to each discharge opening according to said detection result. For actual algorithm, the pulse width is increased by 0.5mus from 4.5mus to 7.0mus, the discharge opening being classified for each pulse width which starts discharging, and a suitable pulse width is established for each discharge opening group.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an inkjet recording device having a plurality of ejection ports, for example, an inkjet recording device having functions such as a facsimile, a copying machine, or a printer, and an inkjet recording device equipped with such functions. The present invention relates to an inkjet recording device used as an output device for multifunction devices, workstations, etc.

[Prior Art] Conventionally, as an example of this type of device, an image reading device is used to convert an image read from a document into a digital signal, data processing is performed, and then an electrical signal is input to an inkjet head. , an ejection energy generator generates ejection energy used to eject ink (recording liquid) from an ejection port, and the ink is ejected from the inkjet head onto the recording material, thereby creating an image. There is a device that forms

Furthermore, an apparatus is known in which desired recording is performed by manually applying an electrical signal containing information based on character data or communication data to an inkjet head.

[Problems to be Solved by the Invention] However, in such devices, the force for ejecting ink ( (ejection power) may vary. When the ejection power is low, there is a problem in that ejection tends to fail when the viscosity of the ink increases due to, for example, being left unused.

Furthermore, if the ejection power differs greatly among the plurality of ejection ports, there will be a problem that the recording quality will also vary. In particular, a large number of ejection ports are provided across the width of the recording member.
As so-called full multi-type inkjet recording heads become available, the reality is that it is quite difficult to make the ink ejection condition from all the ejection ports the same just by controlling the manufacturing precision of the inkjet recording head. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inkjet recording apparatus that solves the above-mentioned problems and solves various problems caused by variations in ink ejection power.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides an inkjet recording head having a plurality of ejection ports, a correction means for detecting ink ejection in this printhead, and a correction means for detecting ink ejection in this printhead. and a correction means for correcting the electrical signal applied to the recording head according to the detection result by the means.

[Function] According to the present invention, there is provided a means for detecting ejection of an inkjet recording head having a plurality of ejection ports (particularly a fully multi-type inkjet recording head), and an electric signal applied to the recording head according to the detection result by the correction means. By providing a means for correcting this, it is possible to minimize variations in ejection stability from one ejection port to another, and even to eliminate such variations.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

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

In FIG. 1, IBk, ly, 1m, and lc are bubble jet recording heads that correspond to black, yellow, magenta, and cyan ink colors, respectively.
A heating resistor is used as a built-in ejection energy generator, and the thermal energy generated when the heating resistor is energized is used to cause bubbles generated in the ink to eject ink droplets from the ejection port. Fixed.

Each recording head has 4736 ejection ports arranged at a density of 400 dpi. Further, a reading head 51 for detecting the ejection port number of ejection or non-ejection is also fixed to the block 2.

Reference numeral 3 denotes a capping unit, which caps the unit 3 by raising the block 2 to a position A shown by the dashed line in the figure during non-recording, such as during standby. Further, during circulation recovery, the capping unit 3 serves as a tray to receive waste ink that is fed from a recovery pump (not shown) and an ink supply system and pushed out from the discharge port. The waste ink is led to a waste ink tank (not shown).

Reference numeral 4 denotes an endless charged adsorption belt which is disposed facing each of the recording heads IBk, ty, 1m and lc at a predetermined interval for conveying the recording sheet, and 5 is connected to each recording head via the charged adsorption belt 4. These are back platens arranged opposite to each other.

Reference numeral 6 designates a paper feed cassette that stores recording sheets 7 such as plain paper and is freely mounted on the main body of the apparatus, and 8 designates a pickup roller that feeds and feeds only one recording sheet 7 on the uppermost surface. A conveyance roller 9 conveys the recording sheet 7 sent out from the pickup roller 8 to the conveyance path 10, and a conveyance roller 11 is disposed on the exit side of the conveyance path 10.

13 and 14 are heaters and fans that dry and fix ink droplets attached to the recording sheet 7 during recording using hot air; 15 is a discharge roller that discharges the recording sheet 7 after fixing to the outside of the apparatus; and 16 is a discharged recording sheet. This is a tray that stores items 7 in sequence.

Next, the operation of the embodiment with the above configuration 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 conveyance rollers 9 and 1.
1 rotates in a pre-charged state and is placed on a charging adsorption belt 4 which is made flat by a back platen 5. The leading edge of the recording sheet 7 is the head l.
c.

1m, ly, and IBk, the energy generator of each recording head is driven in accordance with the image data via a drive circuit (not shown).

By this driving, ink droplets corresponding to the image information are ejected from the ejection ports onto the surface of the recording sheet 7, thereby performing recording.

If the recording sheet 7 has poor hygroscopicity, the droplets attached to the surface will not dry and will be rubbed, causing print stains.
Forced drying is performed using 3g and fan 14 to fix the image. The recording sheet 7 that has been fixed is discharged onto a tray 16 by a discharge roller 15.

As mentioned above, cyan, magenta, yellow,
A color image is formed by applying a recording signal corresponding to each head to the recording head corresponding to black ink.

Next, the ejection principle of the inkjet recording head used in the apparatus of this embodiment will be explained.

A recording head used in an inkjet recording device generally has a fine liquid ejection opening (orifice).

The apparatus includes a liquid flow path, an energy acting part provided in a part of the liquid flow path, and an energy generating means for generating droplet forming energy to act on the liquid in the acting part.

Energy generating means for generating such energy include recording methods using electromechanical transducers such as piezo elements, irradiating electromagnetic waves such as lasers, absorbing them into the liquid, and generating heat. There are recording methods using energy generating means that ejects and flies droplets due to the effect of this heat generation, and recording methods that use energy generating means that heats the liquid with an electrothermal converter and ejects the liquid.

Among these, the recording head used in the inkjet recording method that discharges liquid using thermal energy has a high density array of liquid discharge ports (orifices) for discharging recording droplets to form flying droplets. This makes it possible to record with high resolution. In addition, a recording head that uses an electrothermal converter as an energy generating means can be easily made compact as a whole as a recording head, and it is also possible to use IC technology, which has undergone remarkable technological advances and improved reliability in the semiconductor field in recent years. Since the advantages of processing technology can be fully utilized and lengthening and planarization (two-dimensionalization) are easy, multi-discharge ports/high-density packaging is easy, and mass productivity is achieved. It is possible to provide an inkjet recording head that is good and has a low manufacturing cost.

In this way, using an electrothermal converter as an energy generation means,
An inkjet recording head manufactured through a semiconductor manufacturing process has a liquid flow path corresponding to each ejection port in -M, and thermal energy is applied to the liquid filling the liquid flow path for each liquid flow path. , an electrothermal transducer is provided as a means for ejecting liquid from a corresponding orifice to form flying droplets, and each liquid flow path is provided with a liquid from a common liquid chamber communicating with each liquid flow path. The structure is supplied.

FIG. 2 shows a schematic configuration of the above-mentioned inkjet recording head. This recording head is manufactured by using a substrate 10 through semiconductor manufacturing process steps such as etching, vapor deposition, and sputtering.
2] Q3. Electrode 104. Liquid channel wall 105. It is composed of a top plate 106.

The recording liquid 112 is supplied from a liquid storage chamber (not shown) to the common liquid chamber 10 of the recording head 101 through a liquid supply pipe 107.
8. In the figure, 109 is a liquid supply pipe connector. The liquid 112 supplied into the common liquid chamber 108 is supplied into the liquid path 110 by capillary action, and is stably held by forming a meniscus at the discharge port surface at the tip of the liquid path. By energizing the electrothermal converter 103,
The liquid on the surface of the electrothermal converter is heated, a bubbling phenomenon occurs, and the energy of the bubbling causes droplets to be ejected from the ejection port surface 111.

With the above-described configuration, a multi-ejection orifice inkjet recording head is formed with a high-density ejection orifice arrangement such as an ejection orifice density of 400 dpi.

FIG. 3 shows the configuration of this multi-length recording head and ink supply means. In this figure, 1 is the recording head, 52 is a common liquid chamber in the recording head 1, and 5 is a common liquid chamber in the recording head 1.
Reference numeral 3 denotes liquid ejection openings (orifices) arranged on the recording liquid ejection surface 54.

The ejection ports 53 shown in this figure are arranged in number to cover the recordable width of the target recording material, and the ejection ports 53 are arranged in number to cover the recordable width of the target recording material. By selectively driving the elements, recording liquid can be ejected 8, and recording can be performed without main scanning of the head itself.

55 is a recording liquid supply tank for supplying recording liquid to the recording head 1; 56 is a main tank for replenishing the recording liquid to the supply tank 55; The liquid is supplied to the liquid chamber 52. Furthermore, when replenishing the recording liquid, it is possible to replenish the supply tank 55 with recording liquid from the main tank 56 via the one-way replenishment rectifier valve 58 using the recovery pump 59.

Reference numeral 60 denotes a traffic recovery rectifier valve used during a recovery operation to restore the ejection function of the recording head 1; 61 a circulation pipe in which the recovery rectifier valve 10 is interposed; The electromagnetic valve 63 interposed in the first supply pipe 57 is an air vent valve for the supply tank.

In the recording head l and its recording liquid supply system and recovery system configured in this way, the solenoid valve 62 is kept open during recording, and the recording liquid is drained from the supply tank 55 due to its own weight. The common liquid chamber 52 is replenished, and the liquid chamber 5
2 to the discharge port 53 via a liquid path (not shown).

In addition, during a recovery operation performed to remove air bubbles remaining in the common liquid chamber 52 and the supply system and to cool down the unnecessarily heated recording head 1, the recovery pump 59 is driven to circulate the recording liquid into the circulation tube. 61 into the common liquid chamber 52, simultaneously driving the recording head to push out air bubbles together with ink from the orifice, and returning the recording liquid from the common liquid chamber 52 to the supply tank 55 through the first supply pipe 57 for circulation. can.

Furthermore, at the time of initial filling of the liquid path, etc., with the solenoid valve 62 closed, the pump 59 pumps the recording liquid through the circulation pipe 61 to the common liquid chamber 52, and discharges the recording liquid from the discharge port 53 as bubbles are discharged. can be done.

A discharge port a is provided at each discharge port constituting the multiple discharge ports.

Table 1 shows the differences in characteristics of the respective discharge ports, which are named as discharge port I, discharge port C5, discharge port d, and so on.

Ink under certain conditions (viscosity 3 cp) common to ejection ports a to d in the table
When driving with constant voltage (approximately 25μ) and constant pulse width (4-5us, 5.0μS, ...7.0μS), the difference in ejection characteristics of each ejection port causes Differences as shown in Table 1 appear. Discharge port a requires the largest amount of energy to discharge, 6.5 μS.
A longer voltage application time is required.

On the other hand, the energy required for ejecting the ejection port d is the smallest among the four ejection ports, and a voltage application time of 5.0 μS or more is sufficient.

When determining the drive conditions for the ejection energy generator, it is necessary to achieve both conditions that allow stable ink ejection and conditions that minimize the failure rate.

First, the conditions for stable ejection include changes in the printing environment, long non-printing times, and increases in ink viscosity.
This is a condition that guarantees ink ejection even when factors that inhibit ink ejection become large.

In other words, this is a condition under which a large ejection power can be obtained.

As a measure of the magnitude of the ejection power, FIG. 4 shows the maximum ejectable ink viscosity and its relationship with the voltage application time. When the ink viscosity is 3 cp, the discharge port d is 5.
Ink is ejected with a voltage application time of 0 μS or more, and the ejection port a
In this case, ejection is performed with a voltage application time of 6.5 μS or more. As can be seen from this figure, when the ink viscosity is 7 cp, the ejection port d
In this case, discharge is performed with a voltage application time of 6.5 μS or more, and the discharge port a
In this case, ejection is performed with a voltage application time of 8.0 μS or more.

Furthermore, the low failure rate can be expressed by the number of pulses applied before a failure occurs, as shown in FIG.

There is a relationship that if the voltage application time is extended, the number of pulses until a failure occurs will decrease. As can be seen from this figure, in order to guarantee the number of pulses of 10' pulses or more required in practice, the voltage application time at the ejection port d is 6.5 μs.
Hereinafter, the time at the ejection port a needs to be 8.0 μs or less.

The voltage application time that can satisfy the conditions that the maximum ink viscosity that can be ejected is 7 cp or more and the number of ejectable pulses is 108 or more is 6.5 μs at ejection port d and 8.0 μs at ejection port a. , are different for both.

In the present invention, the difference in ejection characteristics of each ejection port is detected,
Depending on the detection result, the driving conditions are changed independently for each heating element corresponding to each ejection port.

The actual correction algorithm, as shown in Figure 6, increases the pulse width from 4.5 μs to 7.0 μs in 0.5 μs increments, classifies the ejection ports according to the pulse width at which ejection starts, and maintains similar ejection characteristics. The ejection ports are stored as the same ejection port group, and an appropriate pulse width is set for each ejection port group.

This process will be explained in detail according to the flowchart of FIG. First, in step Sl, the initial value Tpw of the pulse width is set to 4.5 μs. Next, in step S2, conditions for ejecting ink are initialized. Here, initializing the ejection conditions includes performing a so-called recovery operation, and means setting conditions related to ejection, such as driving voltage and temperature control, to predetermined conditions.

Next, in step S3, the pulse width is set to Tpw. In step S4, the discharge port N which failed to discharge last time
In step S5, it is measured whether ink is ejected from ejection ports other than the ejection port that failed last time. Note that the measurement starts from the voltage application time, that is, the pulse width, of 45 μs, so the pulse width is 4.5 μs.
In the case of s, there is no discharge port that failed to discharge last time.

Then, in step S6, the ejection port numbers of the ejection ports whose ink ejection was measured with a pulse width of 4.5 μs are stored as the ejection port group Tpw.

In step S7, Tpw is increased by 0.5 μs,
Repeat similar measurements. In step S8, Tpw
If it is determined that the time exceeds 7.0 μs, step S9
Then, an appropriate pulse width is set for each ejection port group Tpw.

Regarding the ejection ports a, b, c, and d shown in Table 1, ejection port a is included in the ejection port group that ejects ink with a voltage application time of 6.5 μs; ．．
Ejection port C is included in the ejection port group that ejects in 0 μs, ejection port C is included in the ejection port group that ejects in voltage application time of 5.5 μs, and ejection port d is included in the ejection port group that ejects in voltage application time of 5.0 μs. .

Examples of recording patterns are shown in FIGS. 7 to 10. The ejection port number is shown in each circle, and if the heating element corresponding to the ejection port is driven and ink is ejected, it is surrounded by a solid circle, and if the heating element is driven but ink is not ejected, it is surrounded by a dotted line. It is surrounded by Numbers were not written for ejection ports that did not drive the corresponding heating elements.

FIG. 7 shows the case of driving with a voltage application time of 4.5 μs, and all the ejection ports failed to eject.

Figure 8 shows the case of driving with a voltage application time of 50 μs,
Ink is ejected from ejection ports No. 1, 3.6..., 4735, and these ejection port numbers are grouped into ejection port group 5.0.
It was classified as

FIG. 9 shows a case where the heating element is driven with a voltage application time of 5.5 μs, and ink is ejected from ejection ports No. 2.8, . . . , and these ejection ports No. 5.5 It was classified as

Fig. 1O shows the case where the heating element is driven at 6.0 μs, and ink is ejected from ejection ports No. 4,5,7,..., 4736, and these ejections No. 80 are ejected from ejection port No. 6.0.
It was classified as When driven at 6.0 μs, ink was ejected from all ejection ports.

As mentioned above, the applied pulse width for each classified ejection port group depends on the required stable ejection performance and durability, as well as the relationship between the voltage application time and the characteristics shown in Figures 4 and 5. Determined from For example, it is driven with a pulse width equal to the pulse width (referred to as pwtn) at which ejection starts under the initial ejection conditions multiplied by a constant of about 1.2.

In order to detect the ejection port numbers of ejection and non-ejection patterns as shown in FIGS. 7 to 10, the reading head 51 shown in FIG. 1, for example, a semiconductor layer made of amorphous silicon containing hydrogen, is used. A reading system using an L-line long image sensor is used. The elongated image sensor may be one in which a plurality of CCDs using a single crystal semiconductor or charge storage type sensors are arranged.

The recording head used in this embodiment is a head in which the pulse width can be set independently for each ejection port. In this embodiment, the increment when setting the pulse width is 0.5 μs, but it is not limited to this.

FIG. 11 shows the configuration of a second embodiment of the present invention. In FIG. 11, the same parts as in FIG. 3 are given the same reference numerals. In this embodiment, a fluid other than the recording ink stored in the main tank 56, for example, an ink that has a higher viscosity than the recording ink and has the maximum viscosity that the recording device wants to eject, is stored in the second tank 66. It is stored. In addition, the flow path switching means 65 switches the flow path between this ink and the recording ink stored in the main tank 56, and the configuration has a switching means in the same mode as the initial filling operation explained in FIG.

FIG. 12 shows the algorithm of the second embodiment of the invention. The correction algorithm in this embodiment is almost the same as that shown in FIG. The difference is that the pulse width is the same as the minimum pulse width for ejecting 7 cp). That is, in the processing of steps Sll to S21, step S12
and step S21 are added to the algorithm shown in FIG.

However, in this embodiment, instead of just making the pulse widths the same as described above, an appropriate setting pulse width may be determined by multiplying the pulse widths by a predetermined constant.

In the first embodiment, in order to detect variations in ejection power for each ejection port, ink is ejected from the ejection ports, the recording material is actually recorded, and the recorded image is exposed to light. We adopted a method that uses a sensor to optically read the data. However, the detection method is not limited to this method, and instead of recording on a recording material, for example, a large number of conductors may be separated and placed opposite the recording head, and the conduction between them by ink may be utilized. A method may also be adopted in which a droplet detection sensor is arranged and the sensor detects ink ejection or non-ejection.

(Others) The present invention brings about excellent effects particularly in a bubble jet type recording head and recording apparatus among inkjet recording types.

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 and producing film boiling on the thermally active surface of the recording head by applying at least one drive signal that corresponds to recorded information and provides a rapid temperature rise above nucleate boiling. As a result, bubbles in the liquid (ink) can be formed in a one-to-one correspondence with this drive signal, which is effective. Due to the growth and contraction of the bubbles, liquid (ink) is ejected through the ejection opening to form at least one hole. If this drive signal is in the form of a pulse, bubble growth and contraction will occur immediately and appropriately.
Particularly responsive liquid (ink) ejection can be achieved,
More preferred. This pulse-shaped drive signal is described in U.S. Pat. Nos. 4,463,359 and 4,345,262.
Those described in the specification 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. In other words, regardless of the form of the recording head, 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 in which a single recording head is formed in one direction. In addition, even if it is a serial type, there is a replacement that is fixed to the main body of the device, or a replacement that is attached to the main body of the device to enable electrical connection with the main body of the device and supply of ink from the main body of the device. Flexible chip type recording head,
Alternatively, the present invention is also effective when using a cartridge type recording head in which an ink tank is integrally provided in the recording 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 capping means for the recording head, cleaning means, pressure or suction means, preheating means using an electrothermal transducer or another heating element, or a combination thereof; It is also effective to perform a preliminary discharge mode in which soil is discharged separately from recording in order to perform stable recording.

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.

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 transmission/reception function. It may be something.

[Effects of the Invention] As described above, the present invention includes a means for detecting variations in ejection power for each nozzle, and a means for correcting an electrical signal applied to the recording head in accordance with the detection by the correcting means. Therefore, even if there are variations in the ejection characteristics of the nozzles, it is possible to achieve both stable ejection and durability.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an example of a recording apparatus implementing the present invention, FIG. 2 is a diagram showing a recording head of an embodiment of the present invention, and FIG. 3 is a supply recovery system of a first embodiment of the present invention. Figure 4 is a diagram showing an example of the relationship between stable ejection performance due to nozzle variations and voltage application time, Figure 5 is a diagram showing an example of the relationship between durability and voltage application time due to nozzle variations, Figure 6 is a diagram showing an algorithm of the first embodiment of the present invention, FIGS. 7 to 10 are diagrams showing an example of discharge/non-discharge detection patterns in the first embodiment of the present invention, and FIG. 11 is a diagram of the invention FIG. 12 is a diagram showing the algorithm of the second embodiment of the present invention. 1, IBk, ly, 1m, lc, 101-recording head, 2... block, 3... capping unit, 4... charged adsorption belt, 5... back platen, 6... paper feed cassette , 7...Recording sheet, 8...Pickup roller, 9.11...Conveyance roller, 10...Conveyance path, 13...Heater, 14...Fan, 15...Ejection roller, 16... Tray, 51... Reading head, 52, 108... Common liquid chamber, 53... Orifice, 54... Recording liquid discharge surface, 55... Recording liquid supply tank, 56... -Main tank, 57...First supply pipe, 58...Replenishment rectifier valve, 59...Recovery pump, 60...Recovery rectifier valve, 61...Circulation pipe, 62...Solenoid valve , 63...Air vent valve, 65...Flow path switching means, 66...Second tank, 102...Substrate, 103...Electrothermal converter, 104...Electrode, 105... Nozzle wall, 106... Top plate, 107... Liquid supply pipe, 108... Common liquid chamber, 109... Connector, 110... Nozzle, 111... Orifice surface, 112... Record liquid. Figure 2 Figure 4 Figure 115 S:0 5.5 6.0 6,5 electric/E11
=I]jJ[1El-￥Lugo0 5 8.0 5 [1S] Figure 5 Figure 1 Ryogawa Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1) An inkjet recording head having a plurality of ejection ports, a detection means for detecting the ejection of ink ejected from the ejection ports, and an inkjet recording head provided to the recording head according to a detection result by the detection means. An inkjet recording device comprising: a correction means for correcting an electrical signal. 2) The inkjet recording apparatus according to claim 1, wherein the detection means is an optical sensor. 3) The inkjet recording apparatus according to claim 2, wherein the optical sensor comprises hydrogenated amorphous silicon. 4) The inkjet recording apparatus according to claim 2, wherein the optical sensor is selected from a CCD or a charge storage type optical sensor. 5) The inkjet recording apparatus according to claim 1, wherein the correction means changes the pulse width of the electric signal.