JPH0564891A - Ink jet recorder and ink jet recording method - Google Patents

Abstract

PURPOSE:To uniformly use the delivery ports for recording to prevent the deterioration of a recording quality by a method wherein a plurality of delivery ports for delivering ink for conducting recording are divided into a plurality of delivery port groups, and a feed amount of a recording medium is selected in accordance with a delivery port group used for recording. CONSTITUTION:On a recording head, for example, 64 nozzles are vertically arranged in a line at intervals of 1/360 inch. In a recording at line pitches of 1/6 inch, for example, a nozzle group (the upper group) from the 3rd nozzle to the 39th nozzle is used for recording the first line. For recording the second line, after a recording medium is fed by 44/360 inch, a nozzle group (the lower group) from the 19th nozzle to the 55th nozzle is used. For recording the third line, after the recording medium is fed by 76/360 inch, the upper nozzle group is used. By selectively controlling a recording medium feed amount in this manner lines can be recorded at pitches of 1/6 inch, and the distribution of the number of deliveries for every nozzle is averaged.

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 apparatus, and more particularly to an ink jet recording apparatus which suppresses deterioration of recording quality due to recording means.

[0002]

2. Description of the Related Art Today, various recording systems have been developed. Among them, the inkjet recording system in which ink is ejected from nozzles in accordance with a recording signal for recording is easy to downsize the apparatus and reduce noise. Has been widely used in recent years.

In this ink jet recording apparatus, as a recovery means when the recording quality is deteriorated, ink is discharged from the nozzle of the recording head by a suction means and a pressure means to remove foreign matters and bubbles in the liquid passage, or to eject ink. The ink adhered matter in the vicinity of the ejection port is removed by cleaning the surface with a wiper.

[0004]

However, among the ink jet recording apparatuses, the recording apparatus of the type in which thermal energy is used to foam ink to eject ink droplets is recorded as recording for a long period of time. The quality tends to deteriorate. The cause is on the heater surface, which is an electrothermal converter for supplying thermal energy to the ink,
This is because the dye and impurities in the ink are solidified by heat and deposited.

Therefore, in the ink jet recording apparatus, impurities are removed by refining the dye so that the deposits are not formed on the heater surface.

However, even if the ink obtained by purifying the dye is used for a long period of time, the quality of recording may deteriorate even though there is almost no deposit on the heater surface.

As a result of detailed examination of the recording head in which the recording quality has deteriorated, the present inventors have found that there is almost no change in the resistance value of the heater provided for supplying thermal energy to the ink to foam the ink. , Found that the amount of foaming is smaller than the original amount to be generated. That is,
It has been found that when the foaming amount becomes small, the ejection energy of the ink becomes insufficient, the speed of the ink droplet decreases, and the foaming irregularity occurs, resulting in the deterioration of the recording quality.

It has been found that the irregular foaming occurs remarkably in nozzles that are rarely used for recording. For example, when character printing is performed using a recording head in which 64 nozzles are arranged in a line at 1/360 inch intervals,
The irregular foaming occurred remarkably between the nozzle and the 64th nozzle.
When printing, this is the nozzle group from 1st to 48th
This is because there is a difference in the amount of ejected ink droplets and the like from the nozzle groups up to the 64th nozzle group, and as a result, nonuniform density occurs in a band shape in the print width. This band-shaped non-uniformity in density is particularly conspicuous, particularly when printing a half-tone graphic image by thinning dots, and the recording quality is remarkably reduced.

Further, when the irregular foaming is remarkable, the ejection speed of ink droplets may be lowered, resulting in distortion of characters and dot omission due to ink ejection failure.

The present invention has been made in response to the above-mentioned results found by the inventors, and its purpose is to:
It is an object of the present invention to provide an ink jet recording apparatus capable of preventing deterioration of recording quality and performing stable recording by preventing the ink discharge ports used for recording from being partially biased.

[0011]

A typical means according to the present invention for achieving the above-mentioned object is a conveying means for conveying a recording medium and a scanning means for scanning the recording medium, and in response to a recording signal. Recording means for ejecting ink from a discharge port to record on a recording medium, and the carrying amount of the recording medium is set to two or more, and the carrying amount of the recording medium is switched according to the scanning of the recording means. In addition, a control means for controlling to change the ejection port group of the recording means for ejecting ink in response to the switching of the transport amount of the recording medium is provided.

[0012]

In the above means, since the ink ejection port group of the recording means is changed for each line recording, the ejection ports used for recording are not biased to a part, and the uneven density in the recording width and It is possible to reduce recording distortion and the like and suppress deterioration of image quality.

[0013]

【Example】

[First Embodiment] Next, an embodiment of an ink jet recording apparatus to which the above means is applied will be described with reference to FIGS. 1 is an explanatory view of nozzles used when performing character printing, FIG. 2 is a perspective view of the overall configuration of an inkjet recording apparatus, FIG. 3 is a block diagram of a control system, and FIG. 4 is a recording system. It is a flowchart which shows a procedure.

First, the overall structure of the ink jet recording apparatus will be described with reference to FIG. 2. A recording head 1 serving as recording means is mounted on a carriage 2, and the carriage 2 is slidable along guide rails 3 and 4. Being supported,
It is connected to a timing belt 7 stretched around pulleys 5 and 6. As a result, when the carriage motor 8 connected to the pulley 5 is driven forward and backward, the carriage 2 scans along the guide rails 3 and 4.

The recording head 1 is driven to perform recording in synchronism with the scanning of the carriage 2. The recording head 1 is a nozzle that is a fine liquid discharge port, a liquid passage, and a part of this liquid passage. And an energy generating means for generating a droplet forming energy to act on the liquid in the acting part.

In the recording head of this embodiment, 64 nozzles are arranged in a line in the upper and lower rows at intervals of 1/360 inch.
A recording method using an electromechanical transducer such as a piezo element as an energy generating means for generating energy for ejecting ink from a nozzle, heat is generated by irradiating electromagnetic waves such as a laser, and the droplets are generated by the action of the heat generation There is a recording method using an energy generating means for discharging the liquid, or a recording method using an energy generating means for discharging the liquid by heating the liquid with an electrothermal converter such as a heating element having a heating resistor. Among them, a recording head used in an inkjet recording method in which a liquid is ejected by thermal energy is high because nozzles for ejecting recording droplets and forming ejection droplets can be arranged at high density. It is possible to record the resolution. Among them, the recording head using the electrothermal converter as the energy generating means can be easily made compact, and the technological progress in the semiconductor field and the improvement of reliability are remarkable in recent years.
It is advantageous because the advantages of technology and micro processing technology can be fully utilized, high-density mounting is easy, and the manufacturing cost is low.

A capping means 9 is provided at the home position of the carriage 2 (a position outside the recording area, that is, the left end position of the guide rails 3 and 4 in FIG. 2). The capping means 9 sucks unnecessary ink from the nozzles of the recording head 1 and caps the ink ejection ports so that the vicinity of the ink ejection ports does not dry during non-recording. The capping means 9 is configured to be movable in the direction of the arrow in FIG. 2. When capping, the capping means 9 is moved to the home position, and then the capping means 9 is moved forward to advance the ink ejection port of the recording head 1. Seal. Reference numeral 9a is a wiper blade made of a member such as rubber.

Conveying means for conveying the recording medium (plain paper, plastic sheet, etc.) 10 is constituted by a conveying roller (not shown) connected to the conveying motor 11 and a pinch roller which can be driven and rotated in pressure contact with the roller. ing.
That is, the recording medium 10 guided by the paper pan 12 is conveyed by U-turn by the conveyance roller and the pinch roller by the driving of the conveyance motor 11. Then, the recording medium 10 conveyed by the U-turn is ejected by the ejection roller 13 and the spur 14.

Next, the control means for driving the above respective parts will be described. In FIG. 3, 15 is a control unit,
It is composed of a CPU 15a, a ROM 15b, and a RAM 15c.

The CPU 15a is a central processing unit, which reads programs and various data from an external device such as a ROM 15b and an input device, which will be described later, performs necessary calculations and determinations, and performs various controls. The ROM 15b is a read-only memory, and an example of how the CPU 15a operates is shown in FIG.
It stores various programs shown in the flowchart shown in FIG. 1, character codes, and various data necessary for dot pattern recording. The RAM 15c is a random access memory, and has a working area in which the CPU 15a temporarily stores instruction data and operation results, a buffer area in which various data input from an external device or the like is stored, and a document or the like is stored. It consists of a text area, etc.

The control unit 15 outputs a drive signal to a head drive circuit 16 for driving the recording head 1, motor drive circuits 17, 18 for driving the carriage motor 8 and the conveyance motor 11, and the recording medium 10 is driven. The nozzles used in the conveying and recording head 1 are drive-controlled as described later.

Next, the recording procedure when the control system drives and controls each member to perform recording will be described. Here, the capital letter "ABCDEFG" is printed on a certain line, the recording medium 10 is conveyed by one line (line pitch 1/6 inch),
Similarly, a case of printing "ABCDEFG" will be described.

Conventionally, when the above-mentioned printing is performed, the nozzles used for the printing are always set to be the same. Specifically, among the 1st to 64th nozzles, the 3rd to 39th nozzle groups (37 Book nozzles) are used, other nozzles are not used.

On the other hand, in this embodiment, as shown in FIG. 4, one line of print data is transferred in step S1, the carriage 2 is scanned in step S2, and the print head 1 is scanned.
Is driven to record the first line. At this time, printing is performed using the third to 39th nozzle groups out of the 64 nozzles lined up (this is referred to as "upper side use").

Next, it is determined in step S whether the second line is recorded.
If it is determined in step 3 and there is next-line recording, the recording medium 10 is conveyed by 44/360 inches in step S4. And step S5
Then, the print data of the next line is transferred, and the carriage 2 is scanned and the print head 1 is driven to print the second line in step S6. At this time, recording is performed using the 19th to 55th nozzle groups (this is referred to as "use on the lower side").

Next, in step S7, it is determined whether or not there is recording in the third line. If there is recording in the next line, the recording medium 10 is conveyed by 76/360 inches in step S8. And step S
At step 9, the print data for the next line is transferred, and the process returns to step S2 to print the third line by using the upper side in the same manner as described above.

FIG. 1 shows the relationship between the carry amount of the recording medium 10 and the nozzles used when printing the first to third lines.

As described above, the conveying amount of the recording medium 10 is set to two types, the conveying amount of the recording medium 10 is switched for each row, and the nozzles used in the recording head 1 for ejecting ink corresponding to the switching. By using the upper side and the lower side of the group, the printing pitch of each line is 1/6 inch,
The cumulative discharge number distribution for each of the 64 nozzles is also averaged. This significantly reduces the number of nozzles that are rarely used.

Here, in accordance with the same recording procedure as described above, the cumulative number of discharges for each nozzle when printing a sentence example having a line pitch of 1/6 inch consisting of letters (uppercase letters and lowercase letters) and numbers was printed by the conventional method. The result of comparison with the case is shown in FIG.
Shown in (a) and (b).

When printing with the same recording head as in this embodiment, the conventional printing method conveys the 1/6 inch recording medium for each line, and when printing the English small letter "abcdefg", it is always the second to the second. When printing the number "0123456789" using 48 nozzle groups, always
It was using the 39th nozzle group. Therefore, the nozzles used as shown in FIG.
~ No. 64 nozzle group was not used at all.

On the other hand, when the conveyance amount of the recording medium 10 is switched for each line and the nozzle group used is changed corresponding to this as in the above-described embodiment, even when the same sentence example is printed, As shown in FIG. 5B, the nozzles used are dispersed throughout, and the cumulative ejection number distribution is also averaged (the number of ejections of the nozzles used most is about ⅔ of the conventional printing method). Reduced) and even no nozzles were used at all.

The nozzles used in this way are averaged,
In addition, since the nozzles that are rarely used are eliminated, irregularities in foaming at the time of ink ejection are reduced, density unevenness and dot omission are eliminated, and deterioration in recording quality is suppressed even after long-term use.

[Second Embodiment] In the first embodiment described above,
For example, if the letter "A" is printed on the upper side,
-The 39th nozzle group was used, and the 19th-55th nozzle groups were used in the lower side use. However, as the second embodiment, the 1st nozzle was used as the reference when using the upper side, and the 64th case was used when using the lower side. An example of recording based on the nozzle will be described.

That is, in the case of using the upper side, the first to 37th nozzle groups are used, and in the case of using the lower side, the 28th to 64th nozzle groups are used with reference to the 64th nozzle. Then, the recording medium 10 is conveyed by 33/360 inches when shifting from the upper side use to the lower side use, and 87/360 when shifting from the lower side use to the upper side use.
Try to carry in inches. FIG. 6 shows a recording state when the recording control is performed such that the upper side use and the lower side use are alternately mixed.

When the upper side is used as described above, the print data in the line to be printed is checked, and for the dot located at the uppermost end, the first data located at the uppermost end of the recording head 1 is checked.
Record using a nozzle. On the other hand, in the case of using the lower side, the print data in the line to be printed is checked, and for the dot located at the bottom end, the 64th nozzle located at the bottom end of the print head 1 is used for recording. To do.

By doing so, the distribution of the cumulative number of discharges for each nozzle of the recording head 1 is further averaged as compared with the case of the first embodiment described above. In the first embodiment, the first and second nozzles are used in the upper side, and the 56th to 64th nozzles are used in the lower side in view of the character design. (It is not the case that the conventional printing method is not used at all), but when the recording control is performed as in the second embodiment, such nozzles are also used on average, so that it is used for a longer period of time. However, it is possible to suppress deterioration of recording quality.

[Other Embodiments] In the above-mentioned second embodiment, when printing "ABCDEFG", when using the upper side, the nozzle for recording the dot located at the uppermost end of the recording data is the first nozzle, and when using the lower side The 28th nozzle is the nozzle that prints the dot located at the top of the print data, and the nozzle spacing is 1/360 inch. Therefore, the difference between the nozzle positions used for upper and lower uses is 28 / 360-1
Although / 360 = 27/360 inches and the line pitch is ⅙ inch, the size of characters and the line pitch need not be limited to this. That is, when the nozzle position difference between the upper side use and the lower side use is L _n , and the line pitch (apparent recording medium conveyance amount on printing) is L _p ,
Set the actual recording medium conveyance amount when switching to lower use from the upper use L _p -L _n, at the time of switching to the upper use from the lower side used for reverse may be set as L _p + L _n.

In the above-described first and second embodiments, an example of recording such that the upper side use and the lower side use are mixed alternately has been shown, but this need not always be alternated and two lines are used. , Every 3 lines, or may be randomly mixed.

Further, in the above-described embodiment, the case where the conveyance amount of the recording medium 10 is set to two kinds and the upper side and the lower side are used has been described. The 11th to 47th nozzle groups may be used, and three types of upper side use, center use, and lower side use may be mixed, and further, three types or more may be mixed.

Further, although the ink jet recording method is used as the recording means in the above-mentioned embodiment, the electrothermal converter is energized in response to a recording signal, and due to the growth of bubbles caused by heating beyond the film boiling by the electrothermal converter. More preferably, the ink is ejected from the ejection port to perform recording.

With regard to its typical constitution and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4740796. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal transducer, which corresponds to the recorded information and provides a rapid temperature rise beyond nucleate boiling,
This is effective because heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, and as a result bubbles in the liquid can be formed in a one-to-one correspondence with this drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection opening to form at least one droplet. It is more preferable to make this drive signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, so that particularly excellent liquid ejection can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise of the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. Nos. 4,558,333 and 4,459,600, which disclose configurations in which the heat acting portion is arranged in a bending region.

Further, JP-A-59-123670 which discloses a structure in which a common slit is used as a discharge portion of a plurality of electrothermal converters and an opening for absorbing a pressure wave of thermal energy are disclosed. Japanese Patent Application Laid-Open No. Sho-A-Ko
The effect of the present invention is effective even with the configuration based on Japanese Patent Publication No. 59-138461. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

In addition, even in the case of the serial type described above, when it is mounted on the recording head fixed to the carriage or the carriage, it is possible to electrically connect to the apparatus main body and supply ink from the apparatus main body. A replaceable chip type recording head or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself may be used.

Regarding the type and number of recording heads mounted on the carriage, for example, only one is provided corresponding to a single color ink, or a plurality of inks having different recording colors and densities are supported. And a plurality of them may be provided. That is, for example, the recording mode of the recording apparatus is not limited to a recording mode of only the mainstream color such as black, but may be a combination of a plurality of recording heads integrally formed, but a mixed color of different colors or a mixed color It is also applicable to a device having at least one of the full colors according to

In addition, although the ink is described as a liquid in the above-mentioned embodiments, it is an ink which is solidified at room temperature or lower and softens or liquefies at room temperature, or in the ink jet recording system. 30 inks
It is common to adjust the temperature within the range of ℃ to 70 ℃ to control the viscosity of the ink so that it is in the stable ejection range. good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from a solid state to a liquid state, or to use ink that solidifies when left standing for the purpose of preventing ink evaporation. However, in any case, when heat ink is liquefied by application of heat energy according to a recording signal and liquid ink is ejected, or when the ink reaches a recording sheet, it begins to solidify. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is described in JP-A-54-5.
As described in Japanese Patent Publication No. 6847 or Japanese Patent Laid-Open Publication No. Sho 60-71260, a mode in which the porous sheet is opposed to the electrothermal converter in a state of being held as a liquid or a solid in the concave portion or the through hole. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as the form of the above-mentioned ink jet recording apparatus, besides the one used as an image output terminal of information processing equipment such as a computer, a copying apparatus combined with a reader or the like, and further a facsimile apparatus having a transmission / reception function. It may be a form or the like.

[0050]

As described above, according to the present invention, since the recording control is performed so that the ink ejection openings to be used are not partially biased, the cumulative ejection times of the ink ejection openings are averaged to some extent. Therefore, it becomes difficult to cause foaming irregularity due to the accumulation of dyes and impurities in the ink on the heating element, and the recording loss and the recording distortion are significantly reduced, and the deterioration of the recording quality is suppressed for long-term use. The life of the recording means can be extended. Also, due to the averaging of the discharge ports used, the ink in the nozzles that was not used as in the past is thickened due to the evaporation of the solvent, and sometimes the ink is not ejected when it should be ejected. In addition, it is not necessary to move the recording head in front of the capping means to eject ink. Therefore, it is possible to prevent a decrease in recording speed and wasteful consumption of ink.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing nozzles used when character printing is performed by a device according to a first embodiment and a conveyance amount of a recording medium.

FIG. 2 is a perspective view of the overall configuration of an inkjet recording device.

FIG. 3 is a block diagram of a control system.

FIG. 4 is a flowchart showing a recording procedure.

FIG. 5A is a table showing used nozzles and the total number of ejections when printing is performed by a conventional printing apparatus. (B) is a table showing the nozzles used and the total number of ejections when printing is performed by the printing apparatus of the present invention.

FIG. 6 is an explanatory diagram showing nozzles used when character printing is performed by the apparatus according to the second embodiment and the carry amount of a recording medium.

[Explanation of symbols]

 1 ... Recording head 2 ... Carriage 8 ... Carriage motor 10 ... Recording medium 11 ... Conveying motor 15 ... Control unit 16 ... Head drive circuit 17 ... Motor drive circuit 18 ... Motor drive circuit

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[Procedure amendment]

[Submission date] August 24, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Inkjet recording apparatus and inkjet recording method

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The inventors of the present invention have analyzed the above-mentioned foaming disorder phenomenon and have come to the following conclusions. That is, the heater surface in the nozzle used for recording receives a kind of cleaning action by the force generated when the ink is defoamed. On the other hand, the heater surface inside the nozzle, which was hardly used for printing, shows the thickened ink and other fine dust adhered to the nozzle surface when cleaning the nozzle with the blade over time. It will be covered with a thin film of impurities generated by being pushed inside. As a result, the heat of the heater is not sufficiently transmitted to the ink, and the amount of foaming of the ink becomes smaller than the original amount. The present invention has been made in response to the results found by the inventors, and an object thereof is an inkjet capable of preventing the occurrence of the foaming disorder phenomenon in advance and performing stable recording. A recording apparatus and an inkjet recording method are provided.
Another object of the present invention is to provide an ink jet recording apparatus and an ink jet recording method capable of preventing deterioration of recording quality and performing stable recording by preventing the ink discharge ports used for recording from being biased to a part. To provide.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

A typical configuration according to the present invention for achieving the above-mentioned object is a plurality of recording apparatuses which eject ink from ejection ports on a recording medium conveyed in a predetermined direction. It is characterized in that the ejection port of is set to a plurality of ejection groups, and a control means for selecting the carry amount of the recording medium according to the ejection groups used for recording is provided.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

In the above structure, since the ink discharge group of the recording means changes for each line recording, the discharge ports used for recording are not biased to a part, and uneven density and recording distortion in the recording width are prevented. It is possible to suppress the deterioration of image quality.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction content]

On the other hand, in this embodiment, as shown in FIG. 4, one line of print data is transferred in step S1, the carriage 2 is scanned in step S2, and the print head 1 is scanned.
Is driven to record the first line. At this time, printing is performed using the third to 39th nozzle groups out of the 64 nozzles arranged side by side (this is referred to as "upper side use" (use of the group on the downstream side in the transport direction of the recording medium 10)).

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

Next, it is determined in step S whether the second line is recorded.
If it is determined in step 3 and there is next-line recording, the recording medium 10 is conveyed by 44/360 inches in step S4. And step S5
Then, the print data of the next line is transferred, and the carriage 2 is scanned and the print head 1 is driven to print the second line in step S6. At this time, printing is performed using the 19th to 55th nozzle groups (this is referred to as "use on the lower side" (use of the group on the upstream side in the transport direction of the recording medium 10)).

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

When the upper side is used as described above, the recorded data in the line to be printed is checked, and the uppermost end (recording medium
For the dots located at the downstream end of 10 in the transport direction, printing is performed using the first nozzle located at the uppermost end of the recording head 1 (the downstream end of the recording medium 10 in the transport direction). On the other hand, in the case of using the lower side, the print data in the line to be printed is checked, and for the dot located at the lowest end (upstream end of the recording medium 10 in the transport direction), the lowest end of the recording head 1 ( Recording is performed using the 64th nozzle located at the upstream end of the recording medium 10 in the transport direction).

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

[Other Embodiments] In the above-described second embodiment, when printing "ABCDEFG", when using the upper side, the nozzle for recording the dot located at the uppermost end of the recording data is the first nozzle, and when using the lower side. The 28th nozzle is the nozzle that prints the dot located at the top of the print data, and the nozzle spacing is 1/360 inch. Therefore, the difference between the nozzle positions used for upper and lower uses is 28 / 360-1
Although / 360 = 27/360 inches and the line pitch is ⅙ inch, the size of characters and the line pitch need not be limited to this. That is, the nozzle position difference between the upper side use (use of the nozzle group on the downstream side in the conveyance direction of the recording medium 10) and the lower side use (use of the nozzle group on the upstream side in the conveyance direction of the recording medium 10) is L _n , When the pitch (apparent recording medium conveyance amount on printing) is L _p , the actual recording medium conveyance amount is L when switching from upper side use to lower side use.
_It may be set to _p −L _n , and conversely, L _p + L _n may be set when switching from the lower side use to the upper side use.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Item name to be corrected] 0040

[Correction method] Change

[Correction content]

Although the ink jet recording system is used as the recording means in the above-mentioned embodiment, the growth of bubbles generated by heating the electrothermal converter to generate film boiling by energizing the electrothermal converter according to a recording signal. Therefore, it is more preferable to perform the recording by ejecting the ink from the ejection port.

Claims (4)

[Claims] 1. A conveyance means for conveying a recording medium, a recording means for scanning the recording medium, and ejecting ink from an ejection port according to a recording signal to record the recording medium on the recording medium. The conveyance amount of the recording medium is set to two or more, and the conveyance amount of the recording medium is switched according to the scanning of the recording unit,
An ink jet recording apparatus comprising: a control unit that controls to change a discharge port group of a recording unit that discharges ink in response to switching of the conveyance amount of the recording medium. 2. A recording line in which a recording head having ejection ports arranged in the vertical direction is used to perform recording using the ejection port at the uppermost end with respect to the recording signal at the uppermost end among the recording signals in one scan, and the lowermost end. 2. The ink jet recording apparatus according to claim 1, wherein the recording control is performed so that the recording lines to be recorded by using the ejection ports at the lowermost end are mixed in correspondence with the recording signal of. 3. The ink jet recording apparatus according to claim 3, wherein the recording means energizes the electrothermal converter according to a recording signal and ejects ink by utilizing thermal energy of the electrothermal converter for recording. The inkjet recording apparatus according to claim 1, wherein 4. In the ink jet recording apparatus, recording means energizes an electrothermal converter in response to a recording signal, and ink is ejected from an ejection port by growth of bubbles caused by heating beyond film boiling by the electrothermal converter. The inkjet recording apparatus according to claim 3, wherein the inkjet recording method is an inkjet recording method for performing recording by discharging.