JPH10100391A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer capable of printing images having plural resolutions in the sub-scanning direction by one head. SOLUTION: In a print head 101, a ratio K/N is an irreducible fraction with the proviso that N is the number of nozzles, K is the interval of nozzles. Line scanning printing of an image is intermittently performed at a Scan 1 and paper feeding by lines of nozzle number is performed in the sub-scanning direction by a unit of K. The above operation is repeated, then the printing of the image in the resolution more precise than the actual interval of nozzles in the sub-scanning direction is performed. A setting value related to K is taken as a parameter and an interleave operation is executed based on the setting value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer apparatus of a printer head scan type such as an ink jet printer, and more particularly, to a printer apparatus using the same print head to perform a plurality of types of interleaved multiple scanning and a plurality of different types of different scanning. The present invention relates to a printer device capable of printing at a resolution.

[0002]

2. Description of the Related Art In an ink jet type color printer, a droplet of ink is ejected from a nozzle in response to a control signal, and the ink is deposited on a recording member (hereinafter simply referred to as recording paper) such as paper or film. It is a printer, and has been rapidly spreading in recent years because of its potential for miniaturization and cost reduction. The method of ejecting ink droplets from the nozzle is roughly classified into a method in which the ink is pressurized by the displacement of the piezo element, and a method in which the ink in the nozzle is heated and vaporized by the heating element and the pressure of the generated bubbles is used. You.

On the other hand, in offices, document creation by a computer called desktop publishing has become popular, and the demand for printing not only characters and figures but also color natural images such as photographs has increased. In such applications, printing with a plurality of different resolutions using one printer is required. That is, the required resolution depends on the content to be printed (characters, natural images, etc.), the purpose of printing (test printing, actual printing), and the type of recording paper (plain paper, recycled paper, special paper, OHP paper, etc.). It will be different.

As a method for satisfying such a demand, there has been proposed a method of performing printing with a resolution higher than a nozzle interval of the print head by using one type of print head. As a first method, there is known a method of performing two types of sub-scan feeds, that is, feed at one resolution element interval and feed for substantially the length of one head. As a second method, a method of performing interleave control in the sub-scanning direction is known.

[0005]

In the first method, two types of sub-scan feed must be performed, and the feed control and the data control of the printing line are complicated. In addition, since printing is continuously performed by the same nozzle over a plurality of lines in the sub-scanning direction, the difference in the discharge characteristics of each nozzle is conspicuous, so-called banding is likely to occur, and the image quality is adversely affected.

In the second method, about two types of interleaved sub-scan feeds are usually performed by the same head. However, the two types of resolutions are limited to these two types of resolutions. Line data control was performed independently. Therefore,
The predetermined resolution is fixed and cannot be changed to any other resolution. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and to provide a printer device capable of printing with a plurality of resolutions in the sub-scanning direction with one type of print head.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is based on an image signal and has two main directions substantially orthogonal to each other between a recording member and a support on which a print head is mounted. A recording image is formed while scanning and sub-scanning, and N images are formed at K resolution element intervals in the sub-scanning direction.
A plurality of nozzle groups are arranged in such a manner that the ratio K / N of K and N is an irreducible fraction, wherein the value of K is 1 or more and is an integer having a plurality of values. The interleaving operation is performed in a single process by setting a setting value related to the value of K as a parameter and performing an interleaving operation based on the setting value.

According to the present invention, printing with a plurality of resolutions in the sub-scanning direction can be performed by one type of print head, and the resolution can be selected in the optimum sub-scanning direction according to the printing conditions. Only by setting the set value indicating the feed amount in the scanning direction, normal printing and each interleave operation can be realized by the same interleave processing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIGS. 1A and 1B are explanatory diagrams of the operation of a print head used in the printer of the present invention, and FIG. 1A shows the operation of the print head at the time of printing with a resolution in the first sub-scanning direction. A diagram showing the printing position,
(B) is a diagram showing the print position of the print head at the time of printing with the resolution in the second sub-scanning direction.
(B) Both use the same print head.
Note that the discharge start position of the nozzle is easy to understand,
Displayed while shifting to the right of the drawing.

The print head 101 used in FIGS. 1A and 1B has the number of nozzles N = 3 and the nozzle interval ≒ 0.3.
387 mm (corresponding to 75 dpi). In the first printing example in FIG. 1A, printing is performed at a dot interval of 150 dpi in both the main scanning direction and the sub-scanning direction, and the print head 101 has a nozzle number N = 3 and a nozzle interval K = 2 (therefore, K / N = 3/2, which is an irreducible fraction), and starts from Scan1 at a drive timing such that the dot interval in the main scanning direction becomes 150 dpi. The print head 101 scans and prints skipping lines (three lines) in Scan1. Next, in the sub-scanning direction, paper is fed by nozzle (N) × K (for three lines) in units of K.

In the drawing, the start position of the scan print is shifted by one dot in the main scanning direction for the sake of simplicity, but it actually moves vertically. As described above, in the paper feeding by the basic interleaving operation, the paper is always fed by the number of lines indicating the number of nozzles. By repeating this operation, printing with a resolution in the sub-scanning direction smaller than the actual nozzle interval becomes possible.

As described above, since the adjacent lines are printed by different nozzles, even if the dots of each nozzle vary due to the difference in the ejection characteristics of the nozzles, the variation becomes inconspicuous when observed over a plurality of lines. Image quality goes up. In the second printing example in FIG. 1B, the dot interval is 30 in both the main scanning direction and the sub-scanning direction.
The print head 101 is driven at a drive timing such that the number of nozzles is N = 3, the nozzle interval is K = 4 (and thus is also an irreducible fraction), and the dot interval in the main scanning direction is 300 dpi. In the paper feed in the scanning direction, the number of nozzles is three, and three lines are provided in units of K. FIG.
In the print examples in (a) and (b), the amount of ink becomes too large by controlling the driving method of each nozzle so that the dot diameter becomes optimal for each dot interval (150 dpi and 300 dpi). Is also gone. Although not shown, both the main scanning direction and the sub-scanning direction are 60
It is also possible to print at 0 dpi. At this time, the number of nozzles N = 3 and the nozzle interval K = 8, and similarly, K / N = 8 /
3 is an irreducible fraction. The interleaving operation is a means for increasing the resolution in the sub-scanning direction. By increasing the printing density in the main scanning direction, it is possible to increase the resolution in both the main scanning and the sub-scanning.

In the example of FIG. 1 described above, the operation is described using a three-nozzle head for the sake of explanation. However, FIG. 2 shows an example that is close to the head configuration of an actual printer. That is, the number of nozzles is 15, and the resolution is 300 dpi and 600 dpi.
This is shown in the example of i. In FIG. 2 as well, for the sake of simplicity, each scan start position is written with one dot shifted for each scan in the main scanning direction, and the location of the nozzle N1 is indicated by a black circle.

In this example, the same head is used and 300
The sub-scanning direction interleaving operation of dpi and 600 dpi is enabled. That is, K1 / N = 4/15, K2
When / N = 8/15, both irreducible fractions are satisfied. The paper feed for each scan is 15 lines with each K as a unit, and the black circle of scan 1 and the black circle of scan 2 are shifted by 15 lines in both the left and right figures.

An example in which the present invention is applied to a two-liquid mixing type ink jet printer (carrier jet) will be described below with reference to FIGS. The inventor of the present invention firstly quantifies one of the diluting liquid and the ink in accordance with the printing information and performs a halftone printing using a mixed liquid obtained by mixing the other in a specified amount (referred to as a carrier jet method). Proposed head (Japanese Patent Application No. Hei 7-254250)
No., filed on September 29, 1995).

That is, FIGS. 3 and 4 show the configuration diagram and operation waveform diagram of the new print head. In FIG. 3, A is an overall view, and B is an enlarged view of a main part. In these figures, the orifice plate 30
1 is provided with a fixed amount side nozzle 302 and a discharge side nozzle 303. Each of the nozzles 302 and 303 is provided with an ink introduction hole 304 and a diluent introduction hole 305 connected thereto.

Further, on the back side of the introduction holes 304 and 305, the fixed amount side cavity 306 and the discharge side cavity 3 are provided.
07 is provided. In addition, these cavities 30
A diaphragm 308 is provided on the side facing the surfaces 6 and 307.
The vibration plate 308 is driven by the fixed-side electrostrictive element 309 and the discharge-side electrostrictive element 310, respectively. In this apparatus, the fixed-side electrostrictive element 309 and the discharge-side electrostrictive element 310
Are supplied with drive signals as shown in FIGS. 4A and 4B, respectively.

That is, FIG. 4A shows the discharge-side electrostrictive element 31.
An example of the drive signal supplied to 0 is shown, and the diluent filled in the diluent introduction hole 305 is discharged from the discharge side nozzle 303 by giving a large displacement to the electrostrictive element 310 at the timing of a. Further, at the timings b and c, the electrostrictive element 310 is displaced in the opposite direction to that at the time of discharge, and the diluent is supplied from the discharge side cavity 307 to the diluent introduction hole 305
Is refilled.

FIG. 4B shows an example of a drive signal supplied to the quantitative side electrostrictive element 309. In the period d to e, ink is pushed out from the quantitative side nozzle 302, and the pushed out ink 311 It is retained on the front surface of the discharge side nozzle 303. When the diluting liquid is discharged from the discharge nozzle 303, the discharged liquid droplet 312 of the diluting liquid is mixed with ink according to the thickness of the retained ink 311.

Therefore, in this apparatus, the discharge (a) is performed at intervals of, for example, 1 msec. At this time, a potential change of 0 to 20 V is applied to the discharge electrostrictive element 310, for example. The diluent is discharged by the displacement of the element 310. On the other hand, at timing (d), a potential change of, for example, 0 to 10 V is applied to the quantitative electrostrictive element 309. Accordingly, ink is not ejected from the electrostrictive element 309 due to the potential change, and the ink is only pushed out from the tip of the nozzle 302.

Also in this apparatus, the amount of ink to be pushed out is controlled in accordance with the length of the period d to e and the width of the potential change. Thereby, the thickness of the ink 311 retained on the front surface of the ejection side nozzle 303 can be controlled,
The density of the ink of the ejected droplets 312 can be arbitrarily controlled. That is, according to the print information described above, the length of the period d to e and the width of the potential change are, for example,
By controlling the voltage at 0 V for 10 V and 50 V for 10 V, printing can be performed at any halftone.

Next, the flow of signal processing of a computer device related to the present invention will be described with reference to FIGS.
In FIG. 5, 90 is a computer device, and 80 is a large-capacity memory means (hard disk,
CD-ROM, etc.), 100 is a printer device, 101 is a print head. In FIG. 6, various signal processes (described later) from an image file 80 to be printed to data to be output to the printer device 100 are performed on a computer device 90, and printing required for a single scan by a head on the printer is performed. The data is output to the printer device 100 as a set of data, and the print data for one scan received from the computer device 90 is printed on the printer device 100.

Computer device 90 and printer device 10
IEEE (0) interface (I / F)
Std 1284 (commonly known as Bi-Centronic)
s) or parallel I / F such as SCSI-2, or RS-
A serial I / F such as 232C or RS-422A can be used. In the present embodiment, a parallel I / F is used because the number of transfer data is large. The digital signal processing of the computer device 90 is performed by, for example, a hard disk, a CD-RO
R output from the image file to be printed, such as M,
The image data of each bit of G and B is converted into cyan (C), magenta (M) and yellow (Y) YMC data by the color separation processing 21.

Under color removal processing (Under Color)
Removal: hereinafter simply referred to as URC) 22
A black component (Bk) is extracted from the Y and MC data,
Generate new Y, M, C, and Bk data. In the color correction / gradation correction 23, if correction is necessary depending on the printing characteristics of the printer, the color correction / gradation correction is performed. In the sharpness correction 24, image sharpening (wide area enhancement, M
Correction processing such as TF correction and blur prevention) and noise removal (smoothing and removal of the background portion) are performed.

The corrected image data is subjected to multi-tone dither processing in a multi-tone dither processing 25 based on the maximum number of gradations in a dot of the carrier jet printer (specifically, a multi-tone error). Diffusion method). In order to perform the head scanning operation and the interleaving sub-scanning operation of the printer device 100 by the banding 26, the lines are rearranged and converted into the order used in the actual head scanning (banding will be described later). .

By performing such processing, the computer device 90 generates print data of the print head 101 in scan units,
The data is transferred to the printer device 100 in synchronization with the actual printing of 0. In the printer device 100, print data is controlled by the discharge control 28, and the mixed discharge operation is performed to discharge ink droplets from the print head 101. In the banding 26, in order to perform the head scanning operation and the interleaving sub-scanning operation of the printer, rearrangement is performed on a line-by-line basis, so that the order is used in the actual head scanning.

In this embodiment, the resolution in the sub-scanning direction at the time of printing is determined by printing conditions (type of recording paper used, printing image quality mode, etc.) before printing. Specifically, 150 dpi (K = 2) and 300 dpi (K =
4) The optimum resolution and the value of K are determined from the possible resolutions that the printer has, such as 600 dpi (K = 8). For example, in the case of the high-quality mode with dedicated recording paper, 600 dpi and K = 8, and in the case of the draft mode with plain paper, 150 dpi and K = 2.

At the start of printing or printing, a printer control command or PDL (Page Discr) is issued.
An instruction indicating the determined resolution in the sub-scanning direction is sent from the computer device 90 to the printer as an option language (page description language). In the banding process, the lines are rearranged based on the interleave operation determined from the resolution in the sub-scanning direction determined in this way, and the order is used in the actual head scan.

FIG. 7 is a block diagram showing the configuration of an example of a printer apparatus to which the present invention is applied. In this FIG.
Print data and print control data from a host computer (not shown) are stored in Vicentronics (IEEE).
E Std 1284) SCSI (parallel), RS
The data is supplied to an internal CPU system bus 2 through a data input interface (I / F) 1 such as 232C and RS422A (serial). The CPU system bus 2 is connected to a mechanical circuit for performing printing, which will be described later, in addition to the CPU 3, the ROM 4, and the RAM 5.

In this device, the system bus 2
Is supplied to the D / A conversion unit 6 to be converted into an arbitrary analog signal. The converted analog signal is supplied to the drive unit 7. The drive unit 7 forms a modulation signal obtained by modulating, for example, the length of the period d to e in FIG. 4B and the potential change width, and this modulation signal is converted into a print head modulation unit 8 (electrostriction in FIG. 3). Element 30
9) is applied.

A print control signal from the system bus 2 is supplied to the timing control unit 9. The D / A conversion trigger signal from the timing control section 9 is D / A
While being supplied to the conversion unit 6, an ejection drive signal as shown in, for example, FIG. 4A described above is formed, and this ejection drive signal is also sent to the print head ejection unit 1 through the drive unit 10.
1 (electrostrictive element 310 in FIG. 3).

Although the drawing shows only one nozzle of one print head, when a plurality of nozzles of a plurality of print heads are driven, the above-described D / A is equivalent to the number of nozzles. Conversion unit 6 to print head modulation unit 8,
And a drive unit 10 and a print head ejection unit 11.

Further, a motor drive trigger signal from the timing controller 9 is supplied to the motor controller 12. Further, a motor drive control signal from the system bus 2 is supplied to the motor control unit 12. Then, a motor drive signal from the motor control unit 12 is supplied to the paper feed motor and the head feed motor 14 through the motor drive unit 13.

Further, a position detection signal from the head position detection sensor 15 is supplied to the timing controller 9. Also,
A temperature detection signal from a temperature sensor 16 provided near a nozzle (not shown) of the print head is supplied to the system bus 2 through a sensor interface (I / F) 17. Signals from these sensors perform, for example, adjustment of an error in a print head reciprocating device, control of a temperature change as described in the above-mentioned document (Japanese Patent Application No. 7-254250), and the like.

FIG. 8 is a block diagram for explaining the mechanism of the printer device to which the present invention is applied. In FIG. 8, the recording paper 210 is wound and transported around the peripheral surface of a platen 211, and the platen 211 is rotationally driven by a paper feed motor 212 via pulleys 213 and 214 and a belt 215.

The print head 216 is attached via a head feed mechanism 217 to a feed screw 218 provided in parallel with the peripheral surface of the platen 211. The platen 211 is moved in parallel with the peripheral surface of the platen 211 by the head feed mechanism 217. Further, the head feed mechanism 21
7 is provided with a tongue 201, and the tongue 201 is detected by a position detection sensor 202 provided on the movement path of the head feed mechanism 217, and the scanning position of the print head 216 is detected. .

In this apparatus, for example, print information 203 from a host computer (not shown) is supplied to form a control signal 204 for head drive, head feed control, paper feed control, and the like. These control signals are transmitted to each print head 216 and the head feed mechanism 21.
7. The print data is supplied to the paper feed motor 212 to perform printing in accordance with the print information, transfer of the recording paper, and scan of the print head.

Next, the operation of the printer will be described with reference to FIGS.
This will be described based on the flowchart shown in FIG. When the operation is started by turning on the power, first, step [1]
11], the apparatus is subjected to initial processing. Next, in step [112], it is determined whether or not a startup processing command for printer processing has been received from the computer. If not (N), the flow returns to step [112] to be in the idling state. When the start processing command is received (Y), printing starts, and step [1] is started.
13], various settings in the printer are performed by various setting commands in the printer control commands sent from the computer. Here, the command processing indicating the resolution in the sub-scanning direction according to the present invention is performed.

Next, at step [114], the recording paper (recording medium) is fed. At step [115], it is determined whether the recording paper has been fed to the print start position and the paper feeding has been completed. If not (N), step [11]
4], and when the sheet feeding is completed (Y), the process proceeds to step [1].
16]. At step [116], the print print data is received and written into the reception buffer.

In step [117], the received print data is written from the reception buffer to the scan buffer corresponding to each print head. In step [118], it is determined whether or not a command for instructing the recording start position in the sub-scanning direction has been received.
19], the recording paper is fed to the recording start position in the sub-scanning direction, and when the recording paper has not been received (N), step [12]
0].

In step [120], print print data for one scan is received, and it is determined whether or not it has been written in the scan memory of each head. When writing has been completed (Y), the process proceeds to step [121]. If the writing has not been completed (N), the flow returns to step [116]. In step [121], the print head prints the print data in the scan buffer for one scan. Step [12
In 2], the print head is operated twice to return to the original position (during single-side scan printing).

In step [123], it is determined whether or not a command indicating a continuous interleave printing operation has been received. If the command has been received (Y), the process proceeds to step [124].
If not (N), the process proceeds to step [125]. In step [124], the recording paper is fed by a distance according to the resolution set in the sub-scanning direction set in advance (interleave feed control). In step [125], it is determined whether or not the next scan print data has been received. If it has been received (Y), the process proceeds to step [124]. If it has not been received (N), the process proceeds to step [126]. It is determined whether a command for instructing the recording sheet start position in the sub-scanning direction has been received.
9], and when the signal is not received (N), step [1] is performed.
28].

In step [128], it is determined whether or not a processing command related to the end of the printing process has been received.
If not received (N), the process returns to step [123]. If received (Y), the process proceeds to step [129].
In step [129], the recording paper is discharged. In step [130], it is determined whether or not the discharge of the recording paper is completed.
When the discharge is completed (Y), the print end process is set and the process returns to the idle state. When the discharge is not completed (N), the process returns to step [129].

Next, the operation of the interleave sub-scan feed control by the CPU in the printer will be described with reference to the flowchart of FIG. The flowchart of FIG. 13 shows one interleaving sub-scan feed operation. Before starting printing, the following sub-scan feed unit and sub-scan feed parameter are set in the RAM 5, for example.

Next, the number of sub-scan feeds is determined from the sub-scan feed parameters and the number of nozzles. Number of sub-scan feeds (= sub-scan feed parameter x number of nozzles) 15 (= 1 x 15) ... when K = 8 30 (= 2 x 15) When K = 4 60 (= 4 × 15) When K = 2 120 (= 8 ×) 15) When K = 1 Interleaved sub-scanning single feed starts in step [151], and in step [152], the sub-scanning feed counter in the CPU The number of sub-scan feeds is set, and step [15]
In 3], the recording paper sub-scan feed is started. Step [15
In [4], the sub-scanning feed counter is decremented at every sub-scanning feeding unit. In step [155], it is determined whether or not the value of the sub-scanning feed counter is equal to or less than 0, and affirmative (Y).
If so, the sub-scan feed is terminated in step [156], and if negative (N), the process returns to step [154].

Next, an example in which the present invention is applied to an on-demand type ink jet printer will be described with reference to FIGS. 6 and 7 again. The difference between the on-demand type printer device is that in the head circuit portion of FIG. 7, when the ink ejection generating force is generated by the displacement of an electrostrictive element represented by a piezo element, or by the bubble generated by the heat generated by the heating element. Similarly, when the ink droplet liquid is ejected, the difference is only the print head and the ejection drive unit.
Since the operation is the same except that the ink droplet of the value is ejected, the following description is omitted.

The difference of the general signal processing flow of the computer shown in FIG. 6 from the present invention is that the multi-valued dithering process in the multi-valued dithering process 25 is changed to a binarized dithering process 25 '. The processing after the binarized dithering processing 25 'is only changed to 1-bit / 1-pixel / 1-color data, and the others are the same. Thus, optimal color processing in the on-demand printer is performed.

As a recording method of the printer, for example, a carrier jet type ink jet printer, a binary type ink jet printer, a dot diameter modulation type ink jet printer, and a carrier jet type other than a type in which ink is heated and vaporized by a heating element and ejected. The present invention can also be applied to various inkjet printer devices such as a density modulation type inkjet printer.

[0049]

As described above, according to the present invention, the following effects can be obtained. (A) Printing with a plurality of resolutions in the sub-scanning direction can be performed with one type of print head. (B) An optimum resolution can be selected in the sub-scanning direction according to printing conditions. (C) Just by setting the set value indicating the feed amount of the recording paper in the sub-scanning direction, normal printing and each interleave operation can be realized by the same interleave processing. (D) The same processing method can be used only by setting the set value related to K in the recording paper control in the sub-scanning direction. (E) By setting the main scanning resolution and the sub-scanning resolution to appropriate values, the aspect ratio of the printed image can be realized other than 1: 1. Therefore, when printing an image input from a video image signal, the aspect ratio conversion processing is performed. It becomes unnecessary.

[Brief description of the drawings]

FIGS. 1A and 1B are operation explanatory diagrams showing an embodiment of a printer device according to the present invention, in which FIG. 1A is a diagram showing print positions of a print head in a first print example, and FIG. 1B is a second print example. FIG. 4 is a diagram showing a print position of a print head of FIG.

FIG. 2 is a diagram showing the diagram of FIG. 1 in a diagram close to the configuration of an actual print head.

FIG. 3 is a configuration diagram of an example of a print head.

FIG. 4 is a waveform diagram of the operation of the print head of FIG.

FIG. 5 is a conceptual diagram showing a system configuration for realizing the printer device of the present invention.

FIG. 6 is a block circuit diagram showing a flow of signal processing of a computer device related to the present invention.

FIG. 7 is a block circuit diagram showing a flow of signal processing of the printer device of the present invention.

FIG. 8 is a perspective view illustrating a mechanism of a print head.

FIG. 9 is a flowchart illustrating an operation on the printer side.

FIG. 10 is a flowchart illustrating an operation on the printer side.

FIG. 11 is a flowchart illustrating an operation on the printer side.

FIG. 12 is a flowchart illustrating an operation on the printer side.

FIG. 13 is a flowchart illustrating a recording paper feed processing procedure.

[Explanation of symbols]

80 image file 90 computer device 1
00: Printer device, 101: Print head, 2
10 ... Recording paper, N1, N2, N3 ... Nozzle group.

Claims (7)

[Claims] 1. A recording image is formed based on an image signal while performing main scanning and sub scanning in two directions substantially orthogonal to each other between a recording member and a support on which a print head is attached; N at K resolution element intervals in the sub-scanning direction
A plurality of nozzle groups arranged in a value in which the ratio K / N of K and N is an irreducible fraction, wherein the value of K is 1 or more and is an integer having a plurality of values. And a setting value related to the value of K is used as a parameter, and an interleaving operation is performed based on the setting value so that the interleaving operation is performed in a single process. 2. The printer according to claim 1, wherein the set value of the interleaving operation is determined by printing conditions such as a type of printing paper and a printing image quality mode. 3. The printer device according to claim 1, wherein the ejection amount is set such that adjacent dots overlap with each other in a dot size on the recording paper. 4. A print head driving speed in a main scanning direction is controlled in accordance with a resolution in a sub-scanning direction by an interleave operation, so that both the main scanning and the sub-scanning are printed with a related resolution. The printer device according to claim 1, wherein 5. The printer according to claim 1, wherein a plurality of printheads having different recording colors in the main scanning direction are arranged in the printhead so that full-color printing can be performed. 6. The printer according to claim 1, wherein the print head is a two-liquid mixing type printer that performs halftone printing using a mixed liquid obtained by quantifying one of a diluting liquid and ink in accordance with printing information and mixing the other with a prescribed amount. The printer device according to claim 1, wherein: 7. The printer according to claim 1, wherein the print head is a bubble jet printer.