JP2001071479A - Ink-jet recording apparatus and printer driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink-jet recording apparatus and a printer driver which can obtain a high image quality with less offset, curling and cockling in perfect printing. SOLUTION: The recording apparatus sets the number of passing in perfect printing to be larger than the number of passing in single-sided printing in accordance with a printing mode. The number of passing to record to the same region is made different or equal between the single-sided printing and perfect printing. Also the number of nozzles to be used or a driving frequency can be made different in accordance with the printing mode.

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 and a printer driver capable of performing double-sided printing (double-sided recording).

[0002]

2. Description of the Related Art Printers, copiers, facsimile machines,
2. Description of the Related Art An ink jet recording apparatus used as an image recording apparatus such as a plotter or an image forming apparatus causes ink droplets ejected from a head to land on paper (meaning that ink droplets adhere, and is not limited to paper). Image recording, image show-through, paper curl, cockling (undulation), and the like are likely to occur.

[0003] In particular, in an ink jet recording apparatus,
When double-sided printing is performed, if image show-through occurs, the image quality of the front and back surfaces is significantly reduced, and if the paper is curled or cockled, the paper transportability is reduced. As a result, the image quality is degraded.

Therefore, in a conventional ink jet recording apparatus, as described in, for example, Japanese Patent Application Laid-Open No. 6-134982, the recording density during single-sided recording (synonymous with single-sided printing) and double-sided recording (synonymous with double-sided printing) The recording time at the time is variable, or the standby time after the front surface recording of the recording medium (synonymous with paper) and before the start of the back surface recording is made variable according to the type of the recording medium during double-sided recording (recording). Regarding the method for reducing the concentration, see also JP-A-5-32024).

[0005]

However, if the recording density during single-sided printing and the recording density during double-sided printing are made variable as described above, there is a problem that the image quality in double-sided printing deteriorates. In addition, providing the waiting time may lower the printing speed during double-sided printing, but has the problem that show-through, curl, and cockling cannot be eliminated.

The present invention has been made in view of the above points, and provides an ink jet recording apparatus capable of obtaining high image quality with less show-through, curl and cockling in double-sided printing. It is an object of the present invention to provide a printer driver capable of performing double-sided printing with high image quality without show-through, curl, and cockling.

[0007]

In order to solve the above-mentioned problems, an ink jet recording apparatus according to the present invention has a configuration in which the number of passes for printing in the same area is different between single-sided printing and double-sided printing. In this case, it is preferable that the number of passes for double-sided printing is larger than the number of passes for single-sided printing.

[0008] The ink jet recording apparatus according to the present invention comprises:
The configuration is such that the number of passes for printing in the same area differs between single-sided printing and double-sided printing depending on the print mode.

[0009] The ink jet recording apparatus according to the present invention comprises:
According to the print mode, the number of passes for printing in the same area in one-sided printing and two-sided printing is made different or the same.

Here, it is possible to adopt a configuration in which the number of passes for backside printing after the frontside printing and the number of passes for single-sided printing during duplex printing are the same.

[0011] The ink jet recording apparatus according to the present invention comprises:
In this configuration, the number of nozzles used for single-sided printing and double-sided printing is different. Here, it is preferable that the number of nozzles used for double-sided printing is smaller than the number of nozzles used for single-sided printing.

[0012] The ink jet recording apparatus according to the present invention comprises:
The configuration is such that the number of nozzles used for single-sided printing and double-sided printing varies depending on the print mode.

[0013] The ink jet recording apparatus according to the present invention comprises:
According to the printing mode, the number of nozzles used for single-sided printing and the number of nozzles used for double-sided printing are made different or the same.

Here, it is possible to adopt a configuration in which the number of nozzles used for backside printing after the front side printing is the same as the number of nozzles used for single-sided printing after double-sided printing.

[0015] The ink jet recording apparatus according to the present invention comprises:
The driving frequency is different between single-sided printing and double-sided printing. Here, it is preferable that the driving frequency for double-sided printing is lower than the driving frequency for single-sided printing.

[0016] The ink jet recording apparatus according to the present invention comprises:
The driving frequency is different between one-sided printing and two-sided printing depending on the print mode.

An ink jet recording apparatus according to the present invention comprises:
According to the printing mode, the driving frequency is made different or the same for single-sided printing and double-sided printing.

Here, it is possible to adopt a configuration in which the driving frequency of the back side printing after the front side printing is the same as the driving frequency of the single side printing in the case of double side printing.

The printer driver according to the present invention is configured to include means for making the number of passes for printing in the same area different between double-sided printing and single-sided printing.

The printer driver according to the present invention has a configuration having means for making the number of nozzles used for double-sided printing and single-sided printing different.

The printer driver according to the present invention has a configuration having means for making the driving frequency different between double-sided printing and single-sided printing.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of an ink jet recording apparatus according to the present invention, and FIG. 2 is a side view of a mechanism of the recording apparatus.

This ink jet recording apparatus comprises a carriage movable in the main scanning direction inside the recording apparatus main body 1, a recording head including an ink jet head mounted on the carriage, an ink cartridge for supplying ink to the recording head, and the like. A paper feed cassette (or a paper feed tray) 4 serving as a paper feed unit capable of stacking a large number of sheets of paper 3 is inserted into and removed from the lower part of the apparatus main body 1 from below. A manual feed tray 5 is mounted on the front side so as to be freely opened, and the paper fed from the paper feed cassette 4 or the paper 3 set in the manual feed tray 5 is taken in. After a required image is recorded by the unit 2, the sheet is discharged to a sheet discharge tray 6 mounted on the rear side. Note that a scanning panel 8 is provided on the front surface.

The printing mechanism 2 holds a carriage 13 slidably in a main scanning direction (a direction perpendicular to the paper of FIG. 2) by a main guide rod 11 and a sub guide rod 12 which are laterally mounted on left and right side plates (not shown). On the lower surface side of the carriage 13, a recording head 14 composed of an ink jet head having nozzles for discharging ink droplets of yellow (Y), cyan (C), magenta (M), and black (Bk) is ejected. The ink tank (ink cartridge) 15 for supplying each color ink to the recording head 14 is exchangeably mounted on the upper side of the carriage 13.

As shown in FIG. 1, the carriage 13 is mounted on a timing belt 20 stretched between a driving pulley (drive pulley) 18 rotated by a main scanning motor 17 and a driven pulley (idler pulley) 19. The carriage 13 is moved in the main scanning direction by connecting and controlling the driving of the main scanning motor 17.

The recording head 14 may include a plurality of heads for ejecting ink droplets of each color arranged in the main scanning direction, or a single head having nozzles for ejecting ink droplets of each color. The used one may be used. In addition, the recording head 14 is configured to discharge ink droplets by pressurizing ink by displacing the diaphragm with an electromechanical transducer such as a piezoelectric element to change the volume of the liquid chamber, and disposed in the liquid chamber. A bubble that is generated by film boiling caused by the heated heating element and pressurizes ink in the liquid chamber to discharge ink droplets. An electrostatic force between the two is used by using a diaphragm that forms the wall surface of the liquid chamber and an electrode that faces the diaphragm. A device that displaces the diaphragm to eject ink droplets can be used.

On the other hand, the paper 3 is electrostatically attracted between the transport roller 21 and the transport driven roller 22 in order to transport the paper 3 in the sub-scanning direction with respect to the printing position (synonymous with the print position) by the recording head 14. The conveyor belt 23 for conveying the sheet is stretched and disposed. As shown in FIG. 1, a sub-scanning motor 24 is provided, and the rotation of the sub-scanning motor 24 is transmitted to the transport roller 21 via a gear train (not shown).
The transport roller 21 is rotated in the sub-scanning direction.

It is preferable that the transport roller 21 has a diameter that does not separate the curvature, for example, a diameter of 30 mm or more, for ensuring the paper adhesion during double-sided printing, and the transport belt 23 has a volume resistance of 10 mm or more. ⁹ Ωcm to 10 ¹² Ωc
It is preferable to use a medium resistor of m.

A print receiving member 26 is provided at a position facing the recording head 14 with the transport belt 23 interposed therebetween. Further, a tip roller 27 for defining a feed angle of the paper 3 is pressed against the transport roller 21 via a transport belt 23 and disposed.

On the other hand, in order to feed the paper 3 from the paper feed cassette 4 onto the conveyor belt 23, a paper feed roller 31 and a friction pad 32 which separate and feed the paper 3 one by one,
A guide member 34 is provided for guiding the fed sheet 3 to the intermediate roller 33 disposed in contact with the transport roller 21.

In order to feed the paper 3 from the manual feed tray 5 to the transport belt 23, a pickup roller 35 for picking up the paper 3 from the manual feed tray 5, a feed roller 36 for feeding the paper 3 and a feed roller 37 , Paper 3
And a guide member 38 that guides the roller to the intermediate roller 33.

Then, a guide member 41 for guiding the paper 3 in order to discharge the paper 3 on which printing has been completed to the paper output tray 6.
And a paper discharge roller 42 for feeding the paper 3 to the paper discharge tray 6
And a paper discharge driven roller 43.

Further, the paper 3 which has passed the printing position by the recording head 4 is discharged in order to discharge the printed paper 3 once out of the apparatus main body 1 and feed it again to the conveyor belt 23 to perform double-sided printing. A guide member 45 for guiding the sheet 3 obliquely downward between the sheet discharge tray 6 and the sheet supply cassette 4 is provided, and near the entrance between the guide member 45 and the guide member 41 on the sheet discharge side, the sheet 3 is A first branch claw 46 for branching the discharge path is swingably provided.

In the vicinity of the terminal end of the guide member 45,
The paper 3 is discharged toward the upper surface of the paper feed cassette 4 outside the apparatus main body 1 (this position is a position where the paper waits for re-feeding, that is, a double-sided printing paper standby position). A switchback roller 47 and a switchback follower roller 48 for feeding the cartridge 3 into the apparatus main body 1 again are provided. The switchback roller 47 is rotated forward when the paper 3 having been printed on one side is conveyed in the discharge direction, reversely rotated when the paper 3 is re-fed, and discharged in the discharge direction of the paper 3 when the paper 3 is discharged. It is stopped at a predetermined timing to hold the rear end.

Further, on the upstream side of the switchback roller 47 and the switchback driven roller 48 in the sheet discharging direction,
A second branching claw 49 for switching the transport path of the sheet 3 between a discharge path to the outside of the apparatus main body 1 and a path for re-feeding the sheet 3 into the apparatus main body 1 is provided swingably. In order to feed the paper 3 fed into the apparatus main body 1 by the reverse rotation of the paper to the transport belt 23, a guide member 51 for guiding the paper 3, a double-sided relay roller 52 for transporting the paper 3 and a double-sided relay roller driven roller 53 and transport roller 2
1 and a transport roller driven roller 54 that feeds the sheet 3 to the intermediate roller 33 following the first roller 1.

Next, the outline of the control section of the ink jet recording apparatus will be described with reference to FIG. The control unit is a microcomputer (hereinafter, referred to as a “CPU”) that also serves as a unit for switching the number of passes, a unit for switching the number of nozzles to be used, or a unit for switching the drive frequency according to the present invention that controls the entire printing apparatus. .) 60, a ROM 61 storing necessary fixed information, a RAM 62 used as a working memory, an image memory 63 storing data obtained by processing image information, and a parallel input / output (P
IO) port 64, input buffer 65, gate array (GA) or parallel input / output (PIO) port 66
And a head drive circuit 67 and drivers 68 and 69.

Here, in addition to image information from the host side, information indicating whether or not double-sided printing is to be performed,
Selection information from the printer driver according to the present invention, such as switching of the number of passes, switching of the number of nozzles used, or switching of the driving frequency, information indicating the type of paper, various instruction information from the operation panel 8 shown in FIG. Signals from various sensors such as a home position sensor for detecting the home position (reference position) are input, and required information is transmitted to the host and the operation panel via the PIO port 64.

The head drive circuit 67 is configured to operate actuator means (electromechanical conversion such as a piezoelectric element) corresponding to each nozzle of the recording head (inkjet head) 14 based on various data and signals provided via the PIO port 66. A driving waveform corresponding to image information is applied to an element, an electrothermal conversion element such as a heating resistor, a diaphragm, or a counter electrode. In addition, as a driving waveform, a rectangular pulse, a triangular waveform, and other shapes such as a sin (sine) waveform can be used.

Further, the driver 68 is connected to the PIO port 6
The main scanning motor 17 is controlled to drive the carriage 13 in the main scanning direction in accordance with the driving data given through the control unit 6, and the sub-scanning motor 25 is driven to control the conveyance rollers 21.
Is rotated in the paper transport direction (sub-scanning direction). The driver 69 controls the driving of a motor 71 for rotating the switchback roller 47 and solenoids 72 and 73 for swinging the first branch claw 46 and the second branch claw 49.

Next, the double-sided printing (double-sided printing) operation of the ink jet recording apparatus will be described with reference to FIGS. Referring to FIG. 4, when double-sided printing is instructed, as shown in FIG. 5, first branching pawl 46 is switched to double-sided printing side, second branching pawl 49 is switched to discharge side, and switchback roller 47 is turned forward. (Rotate in the direction to discharge the paper out of the device). By rotating the paper feed roller 31 to feed the paper 3 from the paper feed cassette 4, the paper 3 is fed to the transport belt 23 of the transport roller 21, is electrostatically attracted to the transport belt 23, and is subjected to sub-scanning. Transported in the direction
Here, the required image is printed on the surface of the paper 3 by driving the actuator means of the recording head 14 according to the recording image while moving the carriage 13 in the main scanning direction.

The paper 3 on which printing by the recording head 14 has been completed is guided by the guide member 45 because the first branching pawl 46 has been switched to the double-sided printing side. And is conveyed by the switchback roller 47 and the switchback driven roller 48 and discharged out of the apparatus main body 1 as shown in FIG. At this time, at the timing when the rear end of the sheet 3 is positioned between the switchback roller 47 and the switchback driven roller 48, the switchback roller 47
Is stopped, and the end of the sheet 3 is held as shown in FIG.

Next, as shown in FIG.
Is switched to the sheet discharging side, the second branching claw 49 is switched to the sheet re-feeding side, and then the switchback roller 47 is rotated in the reverse direction and the intermediate roller 51 is driven. While guiding the paper 3 whose end is nipped by the guide member 51, the intermediate roller 51
To re-feed the sheet to the conveyor belt 23. In this case, the paper feed linear speed when re-feeding the paper 3 is set to be substantially the same as the linear speed of the transport belt 23. By this, paper 3
Can be fed while the surface, which is the printing surface, is not rubbed against the conveyor belt 23 while being in close contact with the conveyor belt 23.

While the paper 3 thus re-fed is conveyed by the conveyor belt 23, an image is printed on the back surface by the recording head 14, and the paper 3 on which printing by the recording head 14 is completed is first branched. The sheet is guided by the guide member 41 on the sheet discharge side through the claw 46, and the discharge roller 42 and the sheet discharge roller 43 are guided.
And is discharged to the discharge tray 6.

After printing on one side of the sheet as described above, an open system for temporarily discharging at least a part of the sheet to the outside of the apparatus main body allows only one recording head (recording means) to be used, and Inside can be simplified, and the ink drop drying time for double-sided printing can be gained,
The printing quality can be improved. In this case, by discharging the printing surface of the sheet to the outside of the apparatus main body, the printing surface to which the ink droplets adhere can be dried outside the apparatus main body, and the printing quality can be improved.

In addition, by inverting the paper in a switchback system and refeeding the paper for double-sided printing, the configuration for performing double-sided printing is simplified, and the ink drying time is ensured while maintaining the ink drying time. Can be performed. Furthermore, by discharging the paper below the printing position by the ink jet head for double-sided printing, it is possible to stably discharge the heavier paper with ink droplets attached to the double-sided printing standby position. it can. In this case, the double-sided printing standby position is located on the upper surface of a paper feeding unit such as a paper feeding tray or a paper feeding cassette for setting paper, so that it is not necessary to provide a separate tray for double-sided printing. Becomes easier. Further, the sheet is temporarily discharged to the sheet discharge tray 6, and the sheet discharge roller 42 can function as a switchback roller.

Next, an embodiment in which the present invention is applied to this ink jet recording apparatus will be described with reference to FIGS. First, “show-through”, which is the subject of the present invention, is a state in which the ink penetrates to the vicinity of the back surface of the paper and appears to bleed from the back surface. As a method of quantitatively showing show-through, there is a method of measuring back density. If the back density is high, the degree of show-through is poor.

As for "curl" and "cockling", a state in which the printing surface swells due to the adhesion of ink and the paper is curled is referred to as "curl", and a state in which the paper becomes uneven is referred to as "cockling". . As a method of quantitatively indicating the curl amount, there is a method of ranking the curl shape when the paper is placed on a flat surface and a method of indicating the rank or a method of measuring the floating amount at both ends of the paper, and the curl shape is cylindrical. The degree is worse as the distance is closer to, and the degree is worse as the floating amount is larger.
As for the amount of cockling, there is a method of measuring the amplitude of the irregularity by using a laser length measuring device. The longer the amplitude, the worse the degree.

Therefore, a different example of the first embodiment of the present invention will be described. In each example of this embodiment, the number of passes for printing the same area is changed between two-sided printing and backside printing. That is, the first example of the pass number setting process executed by the CPU 60 of the control unit with reference to FIG. 8 will be described. One-sided printing or double-sided printing is discriminated. Is set to pa, and in the case of double-sided printing, the number of passes to print in the same area is pb
(Pb> pa) is set.

The control unit executes this pass number setting process before the start of the printing operation, and in the printing operation, moves and scans the carriage 13 with the set number of passes to execute printing.

Here, the number of passes for printing in the same area refers to the number of divisions in the case where a solid image is divided and printed, and the pass indicates that the carriage moves in the main scanning direction. 9A to 9F are examples of the print pattern to be divided.
There is something like FIG. 1A shows an example of a full solid image in which the number of passes is one, and the grid in the figure is a grid of the highest resolution reproducible by the printing apparatus (this is referred to as a dot).

As shown in FIG. 5B, when the pattern shown in FIG. 5A is printed in, for example, two passes, the pattern is divided alternately for each dot as shown in FIG.
The black portion is printed the first time, and the white portion is printed the second time. The same applies to the case where the first time is white and the second time is black. Also, FIG.
FIG. 4D shows a pattern when divided into horizontal lines and printed in two passes, and FIG. 4D shows a pattern when divided into vertical lines and printed in two passes. Further, FIG. 9E shows a pattern (numbers 1 to 5 in the figure) when printing is performed in four passes.
4 indicates dots to be printed in each pass),
FIG. 7F shows a pattern when printing is performed in eight passes. Note that the number of passes and the pattern example are not limited to those described above, and the number of passes and the pattern may be variously considered.

FIG. 10 shows an example of the measurement results of the number of passes and the back density, FIG. 11 shows the results of the number of passes and the amount of curl, and FIG. 12 shows the results of the number of passes and the amount of cockling. As can be seen from these figures, as the number of passes increases, the back density decreases (the show-through decreases), the curl amount decreases, the cockling amount decreases, and the image quality increases. .

Therefore, as described above, by changing the number of passes between single-sided printing and double-sided printing, the optimum number of passes can be set for each printing, and the high pass without show-through, curl, and cockling can be set. Print quality images.

In the double-sided printing, when the surface to be printed first is the front surface and the surface to be printed later is the back surface, when the show-through, curl, and cockling occur after the front surface printing, printing on the back surface becomes difficult. There is. Therefore, by setting the number of passes pb of double-sided printing to be greater than the number of passes pa of single-sided printing, show-through in front-side printing, curl, good backside printing can be performed by preventing the occurrence of cockling,
High quality printing becomes possible.

Next, referring to FIG.
A second example of the pass number setting process executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. Then, in the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the number of passes is set to pa1 for single-sided printing, and the number of passes is set to pb1 (pb1> pa1) for two-sided printing. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing.
(Pa2> pa1), and for double-sided printing, the number of passes is set to pb2 (pb2> pa2).

Here, in general, when the printing speed is increased, the image quality is reduced, and when the image quality is improved, the printing speed is reduced. Is provided with at least two modes of “image quality priority mode” in which priority is given to speed, and any one of the modes can be selected. The print mode can be selected by the operation panel 8 or a printer driver of a host device that supplies data to the recording device.

FIG. 14 shows the evaluation results of the number of passes and the printing speed satisfaction, and FIG. 15 shows the evaluation results of the subjective satisfaction of the number of passes and image quality. From these evaluation results, it can be seen that if the number of passes is 4 or less, the printing speed is satisfactory, and if the number of passes is 3 or more, the image quality is satisfactory. Therefore,
In the above-described processing, the number of passes pa1 for speed-priority single-sided printing and the number of passes pb for speed-priority double-sided printing
1, the number of passes pa2 in the image quality priority single-sided printing and the number of passes pb2 in the image quality priority double-sided printing are, for example, pa1.
It is preferable to set <pb1 <pa2 <pb2.

Specifically, in "speed priority", the number of passes pa1 for single-sided printing is pa1, the number of passes for double-sided printing pb1 = 2,
In the case of “image quality priority”, the number of single-sided printing passes pa2 = 5 and the number of double-sided printing passes pb2 = 10 were selected and actually evaluated. The “speed priority” satisfied the speed, and the “image quality priority” satisfied the image quality. Was done.

As described above, by switching the number of passes for printing in the same area of single-sided printing and double-sided printing in accordance with the print mode, it is possible to perform printing in accordance with the required printing speed and image quality.

Next, referring to FIG.
A third example of the pass number setting process executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, the number of passes for single-sided printing and double-sided printing is set to pa1. On the other hand, in the image quality priority mode,
It is determined whether printing is single-sided or double-sided, and the number of passes is set to pa2 (pa2> pa1) for single-sided printing, and the number of passes is set to pb2 (pb2> pa2) for double-sided printing.

That is, in the speed priority mode, the number of passes for single-sided printing and double-sided printing is set to be the same, so that the speed is given the highest priority. Specifically, the number of passes pa1 for single-sided printing and double-sided printing is set to 1 for “speed priority”, and the number of passes pa2 for single-sided printing is set for “image quality priority”.
5. The number of passes of double-sided printing, pb2 = 10, was selected and actually evaluated. As a result, "speed priority" satisfied the speed more than the second example, and "image quality priority" satisfied the image quality.

As described above, by changing the number of passes for printing in the same area of single-sided printing and double-sided printing depending on the print mode, the number of passes is changed or the same, so that printing in accordance with the required printing speed and image quality is performed. It can be performed.

Next, referring to FIG.
A fourth example of the pass number setting process executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing. In the case of single-sided printing, the number of passes is set to pa1, and in the case of double-sided printing, the number of passes of front side printing is set to pb1 (pb1> pa1).
Then, the number of passes of the back side printing is set to pa1 which is the same as the one side printing. On the other hand, in the image quality priority mode, it is determined whether the printing is single-sided or double-sided, and the number of passes is set to pa2 (pa2> pa1) for single-sided printing, and the pass for front-side printing is set for double-sided printing. The number of times is pb2 (pb2> pa2)
Then, the number of passes of the back side printing is set to the same pb1 as the one side printing.

In other words, by setting the number of passes for backside printing and the number of passes for single-sided printing in duplex printing to be the same, the speed can be increased while maintaining the image quality in duplex printing. Specifically, in “speed priority”, the number of passes pa1 of backside printing of one-sided printing and two-sided printing, pa1 = 1,
The number of passes pb1 of front-side printing in double-sided printing is set to 2, and the number of passes pa2 of back-side printing in single-sided printing and double-sided printing is set to 5, and the number of front-side printing pb2 in double-sided printing is set in "image quality priority". = 10 was selected and actually evaluated, the speed in double-sided printing could be increased, and the image quality was also improved.

As described above, by making the number of passes for backside printing of single-sided printing and that of double-sided printing the same and making the number of passes only for the front side printing of double-sided printing different, the printing speed and image quality of double-sided printing can be improved.

Next, a different example of the second embodiment of the present invention will be described. In each example of this embodiment, the number of nozzles used for double-sided printing and that for backside printing (hereinafter referred to as “used nozzle number”) are made different. In other words, a first example of the used nozzle number setting process executed by the CPU 60 of the control unit with reference to FIG. 18 will be described. The number of nozzles is set to na, and in the case of double-sided printing, the number of nozzles used for printing in the same area is nb (nb <n
Set to a).

The control unit executes this process for setting the number of used nozzles prior to the start of the printing operation. In the printing operation, the control unit drives the energy generating means of the head 14 with the set number of used nozzles to discharge the ink droplets. Discharge.

Here, an example of the relationship between the number of used nozzles and the image area will be described with reference to FIGS.
When the number of nozzles of the head is, for example, 128 (No. 1 to 128), when printing is performed using all 128 nozzles, it is necessary to print an image area in two passes as shown in FIG. On the other hand, when the number of used nozzles is reduced, for example, when printing is performed using half of 64 nozzles, FIG.
Will print the same area in 4 passes as shown in
When printing is performed by using 1/4 of 32 nozzles, the same area is printed by 8 passes as shown in FIG.

FIG. 22 shows an example of the measurement results of the number of used nozzles and the back density, and FIG.
FIG. 24 shows the results of the number of used nozzles and the amount of cockling. As can be seen from these figures, as the number of nozzles used decreases, the back density decreases (reduction of show-through), the amount of curl decreases, the amount of cockling decreases, and the image quality increases. Heading.

Therefore, as described above, by changing the number of used nozzles between single-sided printing and double-sided printing, the optimum number of used nozzles can be set for each printing, and the show-through, curl, and cockling can be set. You can print high-quality images without any.

In the double-sided printing, when the surface to be printed first is the front surface and the surface to be printed later is the back surface, when the show-through, curl, and cockling occur after the front surface printing, the back surface printing becomes difficult. There is. Therefore, by setting the number of used nozzles nb for double-sided printing to be smaller than the number of used nozzles na for single-sided printing, it is possible to prevent the occurrence of show-through, curl, and cockling in front side printing, and to perform favorable back side printing. Thus, high-quality printing can be performed.

Next, referring to FIG.
A second example of the process for setting the number of nozzles to be used executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing. The number of used nozzles is set to na1 for single-sided printing, and the number of used nozzles is set to nb1 (nb1 <na1) for double-sided printing. I do. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the number of used nozzles is set to na2 (na2 <na1) for single-sided printing. nb2 (nb2 <na2) is set.

Here, in general, when the printing speed is increased, the image quality is reduced, and when the image quality is improved, the printing speed is reduced. Is provided with at least two modes of “image quality priority mode” in which priority is given to speed, and any one of the modes can be selected. The print mode can be selected by the operation panel 8 or a printer driver of a host device that supplies data to the recording device.

FIG. 26 shows the results of evaluation of the number of used nozzles and the printing speed satisfaction, and FIG. 27 shows the results of evaluation of the subjective satisfaction of the number of used nozzles and image quality. From these evaluation results,
If the number of used nozzles = 40 or more, the printing speed is satisfied,
It can be seen that the image quality is satisfactory if the number of nozzles used is 50 or less. Therefore, in the above-described processing, the number of used nozzles na1 in the case of speed-priority single-sided printing, the number of used nozzles nb1 in the case of speed-priority double-sided printing, the number of used nozzles na2 in the case of image-quality-priority single-sided printing, and the number of used nozzles in the case of image-quality priority double-sided printing The number of used nozzles nb2 is, for example, na>nb1>na2>
It is preferable to set nb2.

Specifically, the number of used nozzles na1 = 128 for single-sided printing and the number of used nozzles nb1 = 64 for double-sided printing for “speed priority”, and the number of used nozzles na2 = 32 for single-sided printing for “image quality priority” Number of nozzles used for nb2 = 16
Was selected and actually evaluated. As a result, the speed was satisfied in "speed priority", and the image quality was satisfied in "image quality priority".

As described above, by switching the number of nozzles used for printing in single-sided printing and double-sided printing in accordance with the print mode, it is possible to perform printing in accordance with the required printing speed and image quality.

Next, referring to FIG.
A third example of the process for setting the number of nozzles to be used executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, the number of nozzles used for single-sided printing and double-sided printing is set to na1. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the number of used nozzles is set to na2 (na2 <na1) for single-sided printing. nb2 (nb2 <
na2).

That is, in the speed priority mode, by setting the same number of nozzles for single-sided printing and double-sided printing,
Speed is given top priority. Specifically, in “speed priority”, the number of used nozzles na1 for one-sided printing and two-sided printing
= 128, and in “image quality priority”, the number of used nozzles na2 for single-sided printing = 32, and the number of used nozzles for double-sided printing nb2 =
When 16 was selected and actually evaluated, it was found that "speed priority" satisfied the speed more than the second example, and "image quality priority" satisfied the image quality.

As described above, by switching the number of nozzles used for printing in the same area of single-sided printing and double-sided printing depending on the print mode, the number of nozzles used is changed or the same, so that the required printing speed and image quality can be satisfied. Printing can be performed.

Next, referring to FIG.
A fourth example of the process for setting the number of nozzles to be used executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. Then, in the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the number of used nozzles is set to na1 for single-sided printing, and nb1 (nb1 <
In na1), the number of nozzles used for backside printing is set to na1 which is the same as that for single-sided printing. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the number of used nozzles is set to na2 (na2 <na1) for one-sided printing, and the front-side printing is performed for two-sided printing. Nb number of nozzles used
2 (nb2 <na2), the number of nozzles used for back side printing is set to nb1, which is the same as that for single side printing.

That is, by setting the number of nozzles used for backside printing and the number of nozzles used for single-sided printing in duplex printing the same, the speed can be increased while maintaining the image quality in duplex printing. Specifically, in “speed priority”, the number of used nozzles na1 for backside printing in single-sided printing and double-sided printing is set to 128, and the number of used nozzles in frontside printing for double-sided printing is set to nb1 = 64. Then, the number of used nozzles na2 for backside printing out of one-sided printing and double-sided printing =
32, number of used nozzles nb2 for front side printing in double sided printing
= 16 was selected and actually evaluated. As a result, the speed in double-sided printing could be increased, and the image quality was also improved.

As described above, the printing speed and image quality of double-sided printing can be improved by making the number of nozzles used for the backside printing of the single-sided printing and the double-sided printing the same and making the number of nozzles used only for the front-side printing of the double-sided printing different.

Next, a different example of the third embodiment of the present invention will be described. In each example of this embodiment, the driving frequency of the head is made different between double-sided printing and backside printing. That is, referring to FIG.
To explain a first example of the drive frequency setting process executed by 60, it is determined whether single-sided printing or double-sided printing, and if it is single-sided printing, the drive frequency for printing in the same area is set to fa,
For double-sided printing, set the drive frequency to print in the same area as fb
(Fb <fa) is set.

The control section executes this drive frequency setting process prior to the start of the printing operation. In the printing operation, the control section drives the energy generating means of the head 14 at the set driving frequency to eject ink droplets. .

Here, the relationship between the drive frequency and the pass time will be described. To lower the drive frequency means to print slowly in the same area (the pass time becomes longer).
In the case where a 600 dpi image is printed while the head 14 is main-scanned as shown in FIG. 31, one pass time at each drive frequency is as shown in Table 1.

[0086]

[Table 1]

FIG. 32 shows an example of the measurement results of the driving frequency and the back density, and FIG. 33 shows the results of the driving frequency and the curl amount.
FIG. 34 shows the results of the driving frequency and the cockling amount. As can be seen from these figures, the lower the driving frequency, the lower the back density (reduction of show-through), the smaller the curl amount, the smaller the cockling amount, and the higher the image quality. .

Therefore, as described above, by changing the driving frequency between single-sided printing and double-sided printing, the optimum driving frequency can be set for each printing.
Print high quality images without show-through, curl and cockling.

In the double-sided printing, when the surface to be printed first is the front surface and the surface to be printed later is the back surface, when the show-through, curl, and cockling occur after the front surface printing, printing on the back surface becomes difficult. There is. Therefore, by setting the driving frequency fb of the double-sided printing to be lower than the driving frequency fa of the single-sided printing, it is possible to prevent the occurrence of show-through, curl, and cockling in the front-side printing and to perform favorable back-side printing. It is possible to print with high image quality.

Next, referring to FIG. 35, the CPU 6 of the control unit
A description will be given of a second example of the drive frequency setting process executed by 0. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing. If the printing is one-sided, the driving frequency is set to fa1, and if the printing is double-sided, the driving frequency is set to fb1 (fb1 <fa1). On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing. If the printing is one-sided, the driving frequency is set to fa2 (fa2 <fa1). fb2 <fa2) is set.

Here, in general, when the printing speed is increased, the image quality is reduced, and when the image quality is improved, the printing speed is reduced. Is provided with at least two modes of “image quality priority mode” in which priority is given to speed, and any one of the modes can be selected. The print mode can be selected by the operation panel 8 or a printer driver of a host device that supplies data to the recording device.

FIG. 36 shows the evaluation results of the driving frequency and the printing speed satisfaction, and FIG. 37 shows the evaluation results of the driving frequency and the subjective satisfaction of the image quality. From these evaluation results, if the driving frequency is 10 kHz or more, the printing speed is satisfied.
It can be seen that the image quality is satisfied when the driving frequency is equal to or lower than 12 kHz. Therefore, in the above-described processing, the driving frequency fa1 for speed-priority single-sided printing, the driving frequency fb1 for speed-priority double-sided printing, the driving frequency fa2 for image quality-priority single-sided printing, and the driving frequency fb2 for image-quality priority double-sided printing. Is, for example, fa>fb1>fa2> fb
It is preferable to set to 2.

Specifically, in "speed priority", the driving frequency fa1 for single-sided printing is 20 kHz, and the driving frequency fb1 for double-sided printing is 10 kHz. In "image quality priority", the driving frequency fa2 for single-sided printing is 10 kHz. fb
When 2 = 5 kHz was selected and actually evaluated, the speed was satisfied in "speed priority" and the image quality was satisfied in "image quality priority".

As described above, by switching the drive frequency used for printing between single-sided printing and double-sided printing according to the print mode, printing can be performed in accordance with the required printing speed and image quality.

Next, referring to FIG. 38, the CPU 6 of the control unit
A description will be given of a third example of the drive frequency setting process executed by 0. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, the drive frequency for single-sided printing and double-sided printing is set to fa.
Set to 1. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing. If the printing is one-sided, the driving frequency is set to fa2 (fa2 <fa1). fb2 <fa2)
Set to.

That is, in the speed priority mode, the driving frequency for single-sided printing and double-sided printing is set to be the same, so that the speed is given the highest priority. Specifically, in “speed priority”, the driving frequency fa1 = 2 for one-sided printing and two-sided printing
0 kHz, and in "image quality priority", the driving frequency fa2 for single-sided printing = 10 kHz and the driving frequency fb2 for double-sided printing
= 5 kHz was selected and actually evaluated. As a result, "speed priority" satisfied the speed more than the second example, and "image quality priority" satisfied the image quality.

As described above, by switching between different or the same drive frequency for printing in the same area for single-sided printing and double-sided printing in accordance with the print mode, printing in accordance with the required printing speed and image quality is achieved. It can be performed.

Next, referring to FIG. 39, the CPU 6 of the control unit
A fourth example of the drive frequency setting process executed by 0 will be described. In this process, it is determined whether the print mode is the speed priority mode or the image quality priority mode. In the speed priority mode, it is determined whether the printing is one-sided printing or two-sided printing. If the printing is one-sided, the driving frequency is set to fa1, and if the printing is double-sided, the driving frequency of the front-side printing is set to fb1 (fb1 <fa1).
In 1), the driving frequency of the back side printing is set to fa1 which is the same as that of the one side printing
Set to. On the other hand, in the image quality priority mode, it is determined whether the printing is one-sided printing or two-sided printing, and the driving frequency is set to fa2 (fa2 <fa1) for single-sided printing, and the driving frequency for front-side printing is set for two-sided printing. The frequency is set to fb2 (fb
In 2 <fa2), the driving frequency of the back side printing is set to fb1, which is the same as that of the one side printing.

That is, by setting the driving frequency for backside printing and the driving frequency for single-sided printing in duplex printing to be the same, the speed can be increased while maintaining the image quality in duplex printing. Specifically, in “speed priority”, the driving frequency fa1 of the back side printing of the one-sided printing and the two-sided printing.
= 20 kHz, the driving frequency fb1 for front side printing in double-sided printing is set to 10 kHz, and the driving frequency fa2 for backside printing in single-sided printing and double-sided printing is set for “image quality priority”.
10 kHz, drive frequency f for front side printing in double-sided printing
When b2 = 5 kHz was selected and actually evaluated, the speed in double-sided printing could be increased, and the image quality was also improved.

As described above, the printing frequency and the image quality of the double-sided printing can be improved by making the driving frequency of the single-sided printing and the double-sided printing the same for the backside printing and making the driving frequency of the front-side printing for the double-sided printing different.

Next, an embodiment of the printer driver according to the present invention will be described. This printer driver is a host device that supplies data to an ink jet recording apparatus via a printer cable or a line (including a general subscriber telephone network, a dedicated line, a local area network, a LAN, or the like), or a copy, facsimile, or printer. In the case of a multifunction peripheral including the above, the multifunction peripheral is stored and held in the storage means of the multifunction peripheral itself, and is installed in a host device or a multifunction peripheral via a recording medium or a network.

Therefore, the printer driver has a means (program) for executing one or more of the pass number setting processings 1 to 4 for making the above-mentioned number of passes different for single-sided printing and double-sided printing. It can be installed in a recording apparatus, and can execute high-image-quality printing with reduced show-through, curl, and cockling on an inkjet recording apparatus.

The printer driver has means (program) for executing one or more of the nozzle number setting processes 1 to 4 for making the number of used nozzles different between single-sided printing and double-sided printing. It can be installed in an inkjet recording apparatus, and can execute high-quality image printing with reduced show-through, curl, and cockling on the inkjet recording apparatus.

Further, as a printer driver, there is provided a means (program) for executing one or more of the above-described drive frequency setting processes 1 to 4 for making the head drive frequency different between single-sided printing and double-sided printing. It can be installed in an inkjet recording apparatus, and can execute high-quality image printing with reduced show-through, curl, and cockling on the inkjet recording apparatus.

Further, the ink jet recording apparatus may have a plurality of setting processes, and the printer driver may have means for designating any one of the plurality of setting processes of the ink jet recording apparatus. By doing so, printing can be performed more easily with the image quality and printing speed desired by the user.

[0106]

As described above, according to the ink jet recording apparatus of the present invention, the number of passes for printing in the same area is different between one-sided printing and two-sided printing. Will be able to do it.
In this case, by setting the number of passes of double-sided printing to be greater than the number of passes of single-sided printing, high image quality can be obtained.

According to the ink jet recording apparatus of the present invention, the number of passes for printing in the same area is different between single-sided printing and double-sided printing depending on the printing mode, so that the printing speed and the image quality of double-sided printing are improved. Can be achieved.

According to the ink jet recording apparatus of the present invention, the number of passes for printing in the same area in one-sided printing and two-sided printing is made different or the same depending on the printing mode. Can be improved.

Here, by adopting a configuration in which the number of passes for backside printing after front side printing and the number of passes for single-sided printing during duplex printing are the same, printing speed and image quality can be improved.

The ink jet recording apparatus according to the present invention comprises:
Since the number of nozzles used for single-sided printing and double-sided printing is different, double-sided printing can be performed with high image quality. In this case, by setting the number of nozzles used for double-sided printing to be smaller than the number of nozzles used for single-sided printing, high image quality can be obtained.

According to the ink jet recording apparatus of the present invention, the number of nozzles used for single-sided printing and double-sided printing is different depending on the printing mode, so that the printing speed and the image quality of double-sided printing can be improved.

According to the ink jet recording apparatus of the present invention, the number of nozzles used for single-sided printing and the number of nozzles used for double-sided printing are made different or the same according to the printing mode. I can do it.

Here, the number of nozzles used for backside printing after the front side printing and the number of nozzles used for single sided printing after duplex printing are the same, so that printing speed and image quality can be improved.

According to the ink jet recording apparatus of the present invention, since the driving frequency is different between single-sided printing and double-sided printing, double-sided printing can be performed with high image quality. In this case, a high image quality can be obtained by setting the driving frequency of the double-sided printing lower than the driving frequency of the single-sided printing.

According to the ink jet recording apparatus of the present invention, since the driving frequency is different between single-sided printing and double-sided printing according to the print mode, the printing speed and the image quality of double-sided printing can be improved.

According to the ink jet recording apparatus of the present invention, the driving frequency is made different or the same for single-sided printing and double-sided printing according to the printing mode, so that the printing speed and the image quality can be improved.

Here, by adopting a configuration in which the driving frequency of the back side printing after the front side printing and the driving frequency of the one side printing after the two side printing are the same, the printing speed and the image quality can be improved.

According to the printer driver of the present invention,
Since there is provided a means for making the number of passes for printing in the same area different between double-sided printing and single-sided printing, the image quality of double-sided printing in an inkjet recording apparatus capable of double-sided printing can be improved.

According to the printer driver of the present invention,
Since the configuration is such that the number of nozzles used for duplex printing and that for single-sided printing are different, the image quality of duplex printing in an inkjet recording apparatus capable of duplex printing can be improved.

According to the printer driver of the present invention,
Since the driving frequency is changed between the two-sided printing and the one-sided printing, the image quality of the two-sided printing in the inkjet recording apparatus capable of the two-sided printing can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of an ink jet recording apparatus according to the present invention.

FIG. 2 is an explanatory side view of a mechanism of the recording apparatus.

FIG. 3 is a block diagram showing an outline of a control unit of the recording apparatus.

FIG. 4 is a flowchart for explaining a double-sided printing operation of the recording apparatus.

FIG. 5 is an enlarged explanatory view of a main part used for explaining the operation.

FIG. 6 is an enlarged explanatory view of a main part used for explaining the operation.

FIG. 7 is an enlarged explanatory view of a main part used for explaining the operation.

FIG. 8 is a flowchart illustrating a first example of a pass count setting process according to the first embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a different example of a division pattern used for describing the embodiment;

FIG. 10 is an explanatory diagram illustrating the measurement results of the number of passes and the back density.

FIG. 11 is an explanatory diagram illustrating the results of the number of passes and the amount of curl.

FIG. 12 is an explanatory diagram illustrating results of the number of passes and the amount of cockling.

FIG. 13 is a flowchart illustrating a second example of the pass count setting process according to the first embodiment of the present invention.

FIG. 14 is an explanatory diagram illustrating the relationship between the number of passes and the printing speed.

FIG. 15 is an explanatory diagram illustrating the relationship between the number of passes and image quality.

FIG. 16 is a flowchart illustrating a third example of the pass count setting process according to the first embodiment of the present invention.

FIG. 17 is a flowchart illustrating a fourth example of the pass count setting process according to the first embodiment of the present invention.

FIG. 18 is a flowchart for explaining a first example of a used nozzle number setting process according to the second embodiment of the present invention.

FIG. 19 is an explanatory diagram of the number of used nozzles and the number of passes used for describing the embodiment.

FIG. 20 is an explanatory diagram of the number of used nozzles and the number of passes used for describing the embodiment;

FIG. 21 is an explanatory diagram of the number of used nozzles and the number of passes used for describing the embodiment.

FIG. 22 is an explanatory diagram illustrating the measurement results of the number of used nozzles and the back density.

FIG. 23 is an explanatory diagram illustrating the results of the number of used nozzles and the amount of curl.

FIG. 24 is an explanatory diagram illustrating the results of the number of used nozzles and the amount of cockling.

FIG. 25 is a flowchart illustrating a second example of the used nozzle number setting process according to the first embodiment of the present invention.

FIG. 26 is an explanatory diagram illustrating the relationship between the number of nozzles used and the printing speed.

FIG. 27 is an explanatory diagram illustrating the relationship between the number of used nozzles and image quality.

FIG. 28 is a flowchart illustrating a third example of the used nozzle number setting process according to the second embodiment of the present invention.

FIG. 29 is a flowchart illustrating a fourth example of the used nozzle number setting process according to the second embodiment of the present invention.

FIG. 30 is a flowchart illustrating a first example of a drive frequency setting process according to the third embodiment of the present invention.

FIG. 31 is an explanatory diagram for explaining a relationship between a driving frequency and a pass time;

FIG. 32 is an explanatory diagram illustrating measurement results of a driving frequency and a back density.

FIG. 33 is an explanatory diagram illustrating results of a driving frequency and a curl amount.

FIG. 34 is an explanatory diagram illustrating results of a driving frequency and a cockling amount.

FIG. 35 is a flowchart illustrating a second example of the drive frequency setting process according to the third embodiment of the present invention.

FIG. 36 is an explanatory diagram illustrating a relationship between a driving frequency and a printing speed.

FIG. 37 is an explanatory diagram illustrating a relationship between a driving frequency and image quality.

FIG. 38 is a flowchart illustrating a third example of the drive frequency setting process according to the third embodiment of the present invention.

FIG. 39 is a flowchart illustrating a fourth example of the drive frequency setting process according to the third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Device main body, 2 ... Printing mechanism part, 3 ... Paper, 4 ... Paper feed cassette, 6 ... Discharge tray, 13 ... Carriage, 14 ... Head, 21 ... Conveying roller, 23 ... Conveying belt, 42 ... Discharge Rollers, 46: first branch claws, 47: switchback rollers, 49: second branch claws.

Claims (18)

[Claims] 1. An ink jet recording apparatus capable of double-sided printing, wherein the number of passes for printing in the same area differs between single-sided printing and double-sided printing. 2. The ink-jet recording apparatus according to claim 1, wherein the number of passes for double-sided printing is larger than the number of passes for single-sided printing. 3. An ink-jet recording apparatus capable of performing double-sided printing, wherein the number of passes for printing in the same area differs between single-sided printing and double-sided printing according to a print mode. 4. An ink-jet recording apparatus capable of performing double-sided printing, wherein the number of passes for printing in the same area in single-sided printing and double-sided printing is made different or the same according to a print mode. 5. The ink jet recording apparatus according to claim 1, wherein the number of passes for backside printing after front side printing and the number of passes for single sided printing during duplex printing are the same. Inkjet recording device. 6. An ink jet recording apparatus capable of performing double-sided printing, wherein the number of nozzles used for single-sided printing and that for double-sided printing are different. 7. The ink jet recording apparatus according to claim 6, wherein the number of nozzles used for double-sided printing is smaller than the number of nozzles used for single-sided printing. 8. An ink-jet recording apparatus capable of performing double-sided printing, wherein the number of nozzles used in single-sided printing and double-sided printing differs depending on the print mode. 9. An ink jet recording apparatus capable of double-sided printing, wherein the number of nozzles used for single-sided printing and the number of nozzles used for double-sided printing are made different or the same according to a printing mode. 10. The ink jet recording apparatus according to claim 6, wherein the number of nozzles used for back side printing after the front side printing is the same as the number of nozzles used for single side printing during double sided printing. Characteristic inkjet recording device. 11. An ink jet recording apparatus capable of performing double-sided printing, wherein a driving frequency is different between single-sided printing and double-sided printing. 12. The ink-jet recording apparatus according to claim 11, wherein the driving frequency for double-sided printing is lower than the driving frequency for single-sided printing. 13. An ink-jet recording apparatus capable of double-sided printing, wherein a driving frequency differs between single-sided printing and double-sided printing depending on a printing mode. 14. An ink-jet recording apparatus capable of performing double-sided printing, wherein the driving frequency of single-sided printing and that of double-sided printing are made different or the same depending on the printing mode. 15. The ink jet recording apparatus according to claim 11, wherein the driving frequency of the back side printing after the front side printing and the driving frequency of the single side printing are the same in the two sided printing. Inkjet recording device. 16. A printer driver for driving and controlling an ink jet recording apparatus capable of performing double-sided printing,
A printer driver having means for making the number of passes for printing in the same area different between two-sided printing and one-sided printing. 17. A printer driver for driving and controlling an ink jet recording apparatus capable of performing double-sided printing,
A printer driver comprising means for making the number of nozzles used for two-sided printing and one-sided printing different. 18. A printer driver for driving and controlling an ink jet recording apparatus capable of performing double-sided printing,
A printer driver having means for making the driving frequency different between double-sided printing and single-sided printing.