JPH09123482A - Recording position correcting method in line-type color recording device and linear recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attempt to realize higher picture quality by a method wherein recording positional deviation is small even under the condition that the positions of a group of discharging ports of a recording heat unit deviate from those on design. SOLUTION: In this linear color recording device 100, the longitudinal directions of a plurality of ink jet head units provided so as to correspond to a plurality of fundamental colors or of a yellow-ink jet head unit 2, a magenta-ink jet head unit 3, a cyan-ink jet head unit 4, a black-ink jet head unit 5 are arranged so as to intersect with the carrying direction of a medium to be recorded. In the recording position correcting method of the device 100, a correcting step for correcting the recording position by a recording head by correcting the recording timing of the recording head is provided, resulting in allowing to contrive to realize higher picture quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a line type recording head unit in which a plurality of line type recording heads are linearly arranged in a direction intersecting at right angles to the direction of conveyance of a recording medium for a plurality of basic colors. The present invention relates to a recording position correction method and a line-type color recording device in a line-type color recording device having a plurality of corresponding lines.

[0002]

2. Description of the Related Art Conventionally, a recording device such as a printer, a copying machine or a facsimile connected to a computer, a word processor or the like forms an image on a recording medium (recording material) such as paper or a plastic thin plate based on image information. It is configured to form. The recording device can be classified into an inkjet type, a wire dot type, a thermal type, and the like depending on the recording system. In either method, a recording material such as ink is attached to a recording material such as paper or a plastic thin plate to form an image.

In the case of the wire dot type, a wire is projected by an electromagnetic force or the like, a ribbon impregnated with ink is struck on a recording material, and the ink is transferred to the recording material to form an image. In the case of the inkjet type, film boiling is formed by the thermal energy applied by the electrothermal energy converter, and the pressure change caused by the generation and contraction of bubbles due to the film boiling is used to apply a recording head (inkjet head) to the recording head. A device configured to eject ink to a recording material to perform recording, or an ink ejecting unit that ejects ink to a recording material by changing the volume of the ink chamber by an electromechanical transducer such as a piezo element. It is common to use these to form an image.

The color recording apparatus can be classified into a serial type and a line type depending on whether the recording head is movable or fixed. A serial type color recording apparatus mounts a recording head on a carriage and performs recording while reciprocating the recording head on the surface of a recording material. Further, in the line type color recording apparatus, a large number of recording heads are linearly arranged in a direction (sub-scanning direction) perpendicular to the recording material conveyance direction (main scanning direction), and recording is performed with the recording heads fixed. The material is conveyed and recording is performed. The line-type color recording apparatus has a line-type recording head unit in which a large number of recording heads are arranged corresponding to the size of the recordable range in the sub-scanning direction, and since a large range can be recorded at the same time, It has the advantage that very high speed recording is possible.

Conventionally, a line printer, which is a kind of line type recording apparatus, has been used for output of a large industrial computer or the like. However, in recent years, color recording has been strongly demanded for printers and the like used for output of OA (office automation) equipment and the like. It is very difficult to perform color recording with a serial type color recording device at high speed. In order to perform color recording at high speed, a line type color recording device that performs recording using a plurality of line type recording head units corresponding to a plurality of basic colors (yellow, magenta, cyan, black) is suitable. There is a strong demand from us. In particular, the line type color ink jet recording apparatus has many advantages such as high speed, low price, high resolution, low running cost, etc., and is rapidly becoming popular in the market, and each company is putting effort into development. It is a product.

6 (a) and 6 (b) show a line type ink jet head unit as a line type recording head unit constituting a general line type color ink jet recording apparatus, and FIGS. 7 (a) and 7 (b). A part of a general line type color inkjet recording apparatus is shown. This line type color inkjet recording device has a resolution of 3
It is 00 × 300 DPI (Dot Per Inch), and the recordable range in the sub-scanning direction is 8 inches (see FIG. 6B). FIG. 6A is a perspective view showing a general line type inkjet head unit, and FIG. 6B is a view taken in the direction of arrow A in FIG. 6A, that is, a bottom view of the general line type inkjet head unit. In the inkjet head unit shown in FIGS. 6A and 6B, an ink tank (not shown) for storing ink and an inkjet head (not shown) for ejecting ink are integrally formed.
As shown in FIG. 6B, 2400 ejection openings 1 for ejecting ink are linearly arranged at a pitch of 1/300 inch over 8 inches corresponding to the recordable range.

FIG. 7A is a partial plan view showing a general line type color ink jet recording apparatus, and FIG. 7B is a partial side view thereof. In FIG. 7, the inkjet head units 2, 3, 4, and 5 eject yellow, magenta, cyan, and black inks, respectively. The recording sheet (recording medium) 6 is conveyed in the conveying direction indicated by arrow B by the sheet conveying rollers 7 and 8.

Conventionally, as a control system of a line type color ink jet recording apparatus as a line type color recording apparatus, the one shown in FIG. 8 is known. In FIG. 8, the inkjet head unit 2 for yellow, the inkjet head unit 3 for magenta, the inkjet head unit 4 for cyan, and the inkjet head unit 5 for black are the same as those in FIG. The computer 101 uses the line-type color inkjet recording apparatus 10 to record image information and character information to be recorded.
Output to 0. The central control unit 102 processes the input information and the line type color inkjet recording apparatus 100.
Take overall control. The storage means 103 is the central control means 1
A program for information processing and device control performed in 02 is stored, and the program is provided to the central control unit 102. The sensor 104 detects the state of the line-type color inkjet recording apparatus 100, such as the presence or absence of recording paper, and provides information to the central controller 102. The actuator driving unit 105 drives the actuator 106 such as a recording sheet conveying motor according to an instruction from the central control unit 102. The yellow head driving unit 107, the magenta head driving unit 108, the cyan head driving unit 109, and the black head driving unit 110 include a yellow inkjet head unit 2, a magenta inkjet head unit 3, and a cyan inkjet head unit 4.
The black inkjet head unit 5 is driven. The power supply unit 111 is the central control means 1
02, actuator drive means 105 and yellow head drive means 107, magenta head drive means 108,
Electric power is supplied to the cyan head driving unit 109 and the black head driving unit 110.

Next, the operation of the conventional line type color ink jet recording apparatus 100 will be described with reference to FIG. At the time of recording, the ink jet head of the line type ink jet head unit is driven according to the image signal, ink is ejected from the ejection port, and the ink is attached to the recording paper 6 to form an image. The inkjet head unit is
The yellow inkjet head unit 2, the magenta inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5 are arranged in this order. Therefore, an image is formed on the recording paper 6 in the order of yellow, magenta, cyan, and black. The line-type color inkjet recording apparatus 100 generally draws innumerable colors by combining and drawing four color inks of yellow, magenta, cyan, and black. For example, when recording a green character, the yellow character is first recorded by the yellow inkjet head unit 2, and then the cyan ink is ejected from the cyan inkjet head unit 4 onto the yellow character. The yellow ink and the cyan ink are mixed (mixed) with each other to develop the green color.

The color recording apparatus of recent years is used not only for simply recording color characters, but also for the purpose of outputting a graphic image recorded on a CD-ROM or the like or a photographic image read by a scanner and outputting the image. High image reproducibility is required. However, in the above-described conventional configuration, if the relative position of the inkjet head for each color deviates from the design value even slightly, a recording position shift (color shift) occurs, and normal recording cannot be performed. Was there. As one means that enables high image reproducibility, there is a method of increasing the resolution. In the line type color inkjet recording apparatus 100 described above, the resolution is set to 300 DPI, but 600 DPI and 720 DPI
Corresponding color recording devices have become common, and the resolution of color recording devices tends to increase year by year.
In a recorded image of a color recording device having a resolution of 300 DPI, the diameter of each recording pixel is 0.09 mm. Therefore, even in the case of a color recording apparatus having a resolution of 300 DPI, if the recording position is deviated by just 0.1 mm, it becomes impossible to perform overwriting. As the resolution becomes higher, the recording pixels become smaller, and higher precision of overwriting is required.

FIGS. 9 (a) and 9 (b) are operation explanatory views for explaining the recording operation when recording one green line using yellow and cyan. FIG. 9A shows the bottom surface of the yellow inkjet head unit 2 and the cyan inkjet head unit 4, that is, the side opposite to the recording paper 6 (the yellow inkjet head unit 2,
Each of the yellow inkjet head units 2 and the cyan inkjet head unit 4 as viewed from the cyan inkjet head unit 4) is shown, and FIG. 9B shows the recording results of yellow and cyan.
In FIG. 9A, the ejection port group 2C of the yellow inkjet head unit 2 ejects yellow ink, and the ejection port group 4C of the cyan inkjet head unit 4 ejects cyan ink. Discharge port group 2C, 4
C is shown as a straight line for convenience. When actually manufacturing a product, there is always an error in the finished dimension with respect to the design dimension. The two-dot chain line in FIG. 9A shows the designed position 4a of the cyan ejection port group 4C. P is cyan ejection port group 4
A deviation (error) between the designed position 4a of C and the actual position of the ejection port group 4C is shown. The yellow ejection port group 2C is assembled at a designed position.

FIG. 9B shows a line type color ink jet recording apparatus 100 in which only the cyan ejection port group 4C shown in FIG. 9A is displaced from the designed position 4a by an amount P.
The recording results for recording one green straight line are shown with 21 being a yellow recording position and 41 being a cyan recording position. The recording of the two colors of yellow and cyan is a recording that is displaced by the displacement amount P of the ejection port group 4C, and despite the attempt to record one green straight line,
Two lines of yellow and cyan are recorded. Such recording position shift (color shift) has been a major obstacle to the pursuit of high image quality.

[0013]

In this line type color recording apparatus, even if the ejection port group of the recording head unit is displaced from the designed position, the recording position displacement is small and high image quality can be achieved. Is required.

According to the present invention, even if the ejection port group of the recording head unit is displaced from the designed position, the recording position displacement is small, and the image quality can be improved. Another object of the present invention is to provide a line-type color recording apparatus capable of achieving high image quality with little displacement in recording position even if the ejection port group of the recording head unit is displaced from the designed position.

[0015]

In order to solve this problem, according to the present invention, a plurality of line type recording head units provided corresponding to a plurality of basic colors have a longitudinal direction intersecting a conveyance direction of a recording medium. A recording position correction method in a line-type color recording apparatus in which a large number of recording heads are mounted in a line-type recording head unit, the recording position of the recording head is corrected by correcting the recording timing of the recording head. It is configured to provide a correction step for

As a result, even if the ejection port group of the recording head unit is deviated from the designed position, the recording position deviation is small, and a recording position correction method in a line type color recording apparatus capable of achieving high image quality can be obtained. To be

[0017]

According to a first aspect of the present invention, a longitudinal direction of a plurality of line type recording head units provided corresponding to a plurality of basic colors intersects with a conveyance direction of a recording medium. A recording position correction method in a line type color recording apparatus in which a large number of recording heads are mounted in a line recording head unit, and the recording position of the recording head is corrected by correcting the recording timing of the recording head. The correction step is provided, and has the effect of correcting the recording position by moving the recording position back and forth.

According to a second aspect of the present invention, in the first aspect of the invention, the correction of the recording timing is performed based on a plurality of recording position deviation data, and the correction is made from the recording position deviation data. It has the effect that the quantity is calculated.

According to a third aspect of the present invention, in the invention according to the second aspect, the correction of the recording timing is performed for each of a large number of recording heads, and the recording timing is corrected for each recording head. Is performed.

According to a fourth aspect of the invention, in the first aspect of the invention, the correction of the recording timing is performed by a correction function derived based on a plurality of recording position deviation data. , Has the effect that the correction amount is calculated from the correction function.

According to a fifth aspect of the invention, in the invention of the fourth aspect, the correction of the recording timing is performed for each of a large number of recording heads, and the recording timing is corrected for each recording head. Is performed.

According to a sixth aspect of the present invention, a plurality of line type recording head units provided corresponding to a plurality of basic colors are arranged in a direction in which a longitudinal direction intersects a recording medium conveying direction, and a line type recording head unit is arranged. A line-type color recording apparatus in which a large number of recording heads are mounted on a recording head unit, and a recording position correction means for correcting the recording position of the recording head by correcting the recording timing of the recording head is provided. The recording position is corrected by moving the recording position back and forth.

According to a seventh aspect of the invention, in the invention according to the sixth aspect, the recording position correction means performs the correction of the recording timing based on a plurality of recording position deviation data. It has an effect that the correction amount is calculated from the positional deviation data.

According to an eighth aspect of the invention, in the invention of the seventh aspect, the recording position correcting means performs the correction of the recording timing for each of a large number of recording heads. In addition, the recording timing is corrected.

According to a ninth aspect of the present invention, in the invention according to the sixth aspect, the recording position correcting means corrects the recording timing by a correction function derived based on a plurality of recording position deviation data. The correction amount is calculated from the correction function.

According to the tenth aspect of the present invention, the recording position correcting means performs the recording timing correction for each of a large number of recording heads, and the recording timing is corrected for each recording head. Have an effect.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a block diagram showing a line type color ink jet recording apparatus according to an embodiment of the present invention. In FIG. 1, a yellow inkjet head unit 2, a magenta inkjet head unit 3, a cyan inkjet head unit 4, a black inkjet head unit 5, a computer 101, a central control unit 102, a storage unit 103, a sensor 104, an actuator driving unit. The reference numeral 105, the actuator 106, the yellow head driving means 107, the magenta head driving means 108, the cyan head driving means 109, the black head driving means 110, and the power supply unit 111 are the same as those in FIG. The line type color inkjet recording apparatus 100 of FIG. 1 differs from the line type color inkjet recording apparatus 100 of FIG. 8 in that a central control unit 102 and a yellow head driving unit 10 are provided.
7, between the magenta head driving means 108, the cyan head driving means 109, and the black head driving means 110,
That is, the recording position correction means 112 and the recording position correction data input means 113 are provided. Recording position correction means 1
12 is a yellow inkjet head unit 2,
The recording timing of the recording heads of the magenta inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5 is advanced or delayed. The recording position correction data input unit 113 inputs the correction data of the recording position from the outside and outputs it to the recording position correction unit 112. The line-type color inkjet recording apparatus 10 according to the first embodiment
The mechanical configuration of 0 is the same as in FIGS. 6 and 7.

The operation of the image coding apparatus configured as described above will be described with reference to FIGS. 1 to 3, 6 and 7. Also in this embodiment, like the conventional device,
The resolution is 300 × 300 DPI, and the recordable range is 8 inches (see FIG. 6). When recording,
In accordance with the image signal, the inkjet heads (recording heads) of the yellow inkjet head unit 2, the magenta inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5 are driven to eject ink from the ejection ports. The ink is attached to the recording paper 6 (see FIG. 7) to form an image. As shown in FIG. 7, the inkjet head unit includes a yellow inkjet head unit 2, a magenta inkjet head unit 3, a cyan inkjet head unit 4, and a black inkjet head unit 5 in the transport direction B of the recording paper 6. Are arranged in this order. Therefore,
An image is formed on the recording paper 6 in the order of yellow, magenta, cyan, and black.

Next, a method of correcting the recording position shift (color shift) in the first embodiment will be described with reference to FIGS. 2 (a) to 2 (c). In FIG. 2A, the design position 4 of the yellow inkjet head unit 2, the cyan inkjet head unit 4, the yellow ejection port group 2C, the cyan ejection port group 4C, and the cyan ejection port group 4C.
Since a is the same as that in FIG. 9A, the description is omitted.
In FIG. 2A, the ejection port group 2C of the yellow inkjet head unit 2 is at the designed position,
Discharge port group 4 of cyan inkjet head unit 4
C is located above the designed position 4a by an amount P. If you record without correcting the recording position,
As shown in FIG. 2B, the yellow recording and the cyan recording are performed by the yellow recording position 21 and the cyan recording position 41.
And P are deviated by P, and two lines of yellow and cyan are recorded on the recording paper 6 as a recording image.
As shown in, it is impossible to perform green recording formed by overlapping the yellow recording position 21 and the cyan recording position 41. Therefore, in the first embodiment,
The recording position correcting means 112 corrects the recording position of cyan so that two colors are overlaid.

Now, a correction method (correction step) by the recording position correction means 112 will be described. Since the line-type color recording apparatus 100 carries out recording while conveying the recording paper 6, if the cyan recording position is displaced in the paper conveying direction A as shown in FIG. By slightly delaying the recording timing, recording can be performed at the regular position. On the contrary, the cyan recording position is in the direction opposite to the A direction of the paper transport direction (downward in FIG. 2).
If it is deviated to, the recording can be performed at the regular position by slightly advancing the cyan recording timing.
Therefore, the recording position correction unit 112 accelerates the recording timing of the inkjet heads (recording heads) of the yellow inkjet head unit 2, the magenta inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5, The recording position can be corrected, that is, the recording position can be shifted in the front-back direction with respect to the A direction.

The correction value (correction amount, recording position deviation data) for correcting the recording position may be determined by visually determining the recording position deviation amount, but the test pattern TP1 as shown in FIG. Is also useful to determine the optimum correction amount. A test pattern TP1 as shown in FIG. 3 is printed at the setup stage of the line type color printing apparatus. In the test pattern TP1 of FIG. 3, when the correction value is increased, the cyan recording is recorded downward with respect to the yellow recording, and conversely, when the correction value is decreased, the cyan recording is upward with respect to the yellow recording. Will be recorded. In the case of FIG. 3, since yellow and cyan are recorded in a straight line at the correction value -2 (the portion surrounded by the chain double-dashed line), by selecting the correction value -2, yellow and cyan are recorded at the recording positions. It is possible to perform recording without misregistration (color misregistration). By performing the same for recording of other colors, it is possible to correct recording positions of all colors.

In this embodiment, the correction amount is determined by visually observing the test pattern TP1, but the correction amount is automatically calculated by recognizing the test pattern TP1 by the pattern recognition device. May be. As a result, it is possible to prevent human variations and visual recognition errors, and it is possible to speed up the process.

As described above, according to the present embodiment, by inputting the correction value of the recording position to the recording position correcting means 112 via the recording position correction data inputting means 113, the yellow ink jet head unit 2 and the magenta ink are recorded. Since the recording timings of the inkjet heads (recording heads) of the inkjet head unit 3, the cyan inkjet head unit 4, and the black inkjet head unit 5 are corrected, the recording position of the recording head is set to the direction A of the recording paper conveyance direction. On the other hand, it is possible to adjust forward and backward, and it is possible to accurately perform overlaying of each color without misalignment of recording positions, and it is possible to achieve high image quality.

(Second Embodiment) A line type color ink jet recording apparatus according to a second embodiment of the present invention will be described below. The configuration of the line type color ink jet recording apparatus according to this embodiment is the same as that of the first embodiment, and the difference is the operation of the recording position correction means 112.

The operation of the line type color ink jet recording apparatus according to this embodiment is shown in FIG.
(E) will be described with reference to FIG. 4A to 4E are operation explanatory diagrams for explaining the operation of the line type color inkjet recording apparatus according to the second embodiment, and FIG. 5 is a test pattern diagram for determining a correction value. FIG.
In (a) to (e), the yellow inkjet head unit 2, the cyan inkjet head unit 4, the ejection port groups 2C and 4C, the designed position 4a, and the recording positions 21 and 41 are the same as those in FIG. The description is omitted. Further, in FIG. 5, recording positions 21 and 41 are the same as those in FIG. In FIG. 2A for explaining the operation of the line-type color inkjet recording apparatus 100 according to the first embodiment, it is assumed that the ejection port group 4C is located above the designed position 4a by a deviation amount P. However, in the second embodiment, as shown in FIGS. 4A and 4B, the recording position is corrected when the left end is Q and the right end is the deviation amount R. This correction method will be described below.

When a single recording position displacement data (correction value) is used as in the first embodiment, the recording position displacement data may cause the recording position correction state to greatly differ depending on the recording position, for example, left and right. . When the test pattern TP1 as shown in FIG. 3 is used, the test pattern TP1 is recorded on the right side of the recording paper 6 (see FIG. 7), and therefore, as shown in FIG. Even if the recording position is corrected in, the recording position is largely displaced on the left side of the recording position. Therefore, in the second embodiment, a plurality of recording position deviation data are acquired at a plurality of recording positions in the sub-scanning direction of the recording paper 6 (direction orthogonal to the B direction of the conveyance direction), and the plurality of recording positions are acquired. The recording position is corrected by the deviation data. FIG.
(D) shows an example of recording position correction in which the recording position is corrected according to the second embodiment. In FIG. 4D, the recording position deviations of S and S ′ are left at the left and right ends, respectively, but the recording deviation amount is greatly reduced as compared with the recording position correction according to the first embodiment. Recording position correction means 1
12 corrects the cyan recording position 41 so that S = S ′ in FIG.

FIG. 5 shows a test pattern TP2 for obtaining recording position correction data at two locations. Test pattern TP2
Since the recording positions of (1) and (2) are set at the left and right ends, the recording position correction data on the right side and the recording position correction data on the left side are averaged by the recording position correction means 112 (the average value is +1 in FIG. 5). It is possible to perform correction with little recording deviation (however, FIG. 5 does not correspond to FIGS. 4A to 4E). If the assembling accuracy is high and the horizontal inclination of the line type inkjet head is small (the difference between Q and R is small), the recording position can be corrected to a degree that is practically inconvenient according to the second embodiment.

Note that, in the second embodiment, the correction amount may be automatically calculated by recognizing the test pattern TP2 by the pattern recognition device, as in the first embodiment.

As described above, according to the second embodiment, by inputting the right and left correction values of the recording position to the recording position correcting means 112, the yellow ink jet head unit 2, the magenta ink jet head unit 3, and the cyan ink jet head unit 3 are input. Since the recording timings of the inkjet heads (recording heads) of the inkjet head unit 4 and the black inkjet head unit 5 are corrected by the average value of the above-mentioned left and right correction values, the left and right are adjusted when the left and right recording position deviation amounts are different. It is possible to correct in a well-balanced manner, and it is possible to perform overwriting of each color accurately without recording position displacement, and to achieve high image quality.

(Third Embodiment) A line type color ink jet recording apparatus 100 according to a third embodiment of the present invention will be described below. The configuration of the line type color ink jet recording apparatus 100 according to the third embodiment is the same as that of the first embodiment, and the difference is the operation of the recording position correcting means 112.

The operation of the line type color ink jet recording apparatus 100 according to the third embodiment is shown in FIG.
This will be described with reference to FIG. FIG. 4F is an operation explanatory view for explaining the operation of the line-type color inkjet recording apparatus according to the third embodiment. In FIG. 4F, the discharge port group 4C and the designed position 4a are the same as those in FIG. 2A, and thus description thereof will be omitted.

As described above, the recording position correction in the second embodiment cannot completely correct the recording position deviation over the entire area in the sub-scanning direction. In the present embodiment, a more reliable recording position deviation correction is performed using a recording position deviation correction function based on a plurality of recording position deviation data. Similar to the recording position deviation correction method according to the second embodiment, a plurality of recording position deviation data are determined visually or by a test pattern. As shown in FIG. 4F, since the ejection port groups 4C of the inkjet recording head are linearly arranged, the displacement amount at the distance L1 from the left end of the recording range is Z1, and the displacement amount at the distance L2 is Z2. Then, the displacement amount ZZ of the ejection port at the distance LL can be obtained by the following equation.

ZZ = (Z2−Z1) / (L2−L1) × (LL−L1) + Z1 (1) If the distances L1 and L2 from the left end of the recording range are set in advance, the recording position correction data By inputting Z1 and Z2, the correction values of all the ejection ports can be calculated by the correction function shown in the equation (1). This calculation is performed by the recording position correction means 112. If these operations are similarly performed for all four color ink jet recording heads,
It is possible to reliably correct the color misregistration (recording position misregistration) of all colors.

In the third embodiment, the correction function is a linear function. However, when the ejection port group 4C is not a straight line or when the ejection port group 4C is warped, the ejection port group 4 is
By setting the correction function according to the situation of C, the recording position can be corrected more reliably.

As described above, according to the third embodiment, since the positional deviation of each ink jet recording head is corrected by the correction function, the positional deviation is corrected over the entire area in the sub-scanning direction (the entire recording area). Therefore, it is possible to completely eliminate the recording position shift in the overwriting of each color, and it is possible to further improve the image quality.

[0046]

As described above, according to the recording position correction method of the line type color recording apparatus of the present invention, the recording timing of the recording head is corrected, so that the recording position of the recording head is set in the recording sheet conveying direction. On the other hand, it is possible to adjust the front and back, and it is possible to perform the overwriting of each color accurately without the recording position deviation, and it is possible to obtain an advantageous effect that the image quality can be improved. Further, it is possible to obtain an advantageous effect that the right and left can be corrected in a well-balanced manner when the left and right recording position displacement amounts are different, and further, the position displacement can be corrected by the correction function over the entire recording range. Can be obtained.

Further, according to the line type color recording apparatus of the present invention, since the recording position correcting means corrects the recording timing of the recording head, the recording position by the recording head is moved forward and backward with respect to the recording sheet conveying direction. It is possible to make adjustments, and it is possible to perform overwriting of each color accurately without a recording position shift, and it is possible to obtain an advantageous effect that high image quality can be achieved. Further, there is an advantageous effect that the left and right recording positions can be corrected in a well-balanced manner by the recording position correcting device when the left and right recording position displacement amounts are different. It is possible to obtain an advantageous effect that the positional deviation can be corrected by using this method.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a line-type color inkjet recording apparatus according to an embodiment of the present invention.

2 (a) is an operation explanatory diagram for explaining the operation of the apparatus of FIG. 1; (b) is an operation explanatory diagram for explaining the operation of the apparatus of FIG. 1; and (c) is an operation of the apparatus of FIG. Operation explanatory diagram for

FIG. 3 is a test pattern diagram showing a test pattern used in the line-type color inkjet recording apparatus according to the first embodiment.

FIG. 4A is an operation explanatory view for explaining the operation of the line type color inkjet recording apparatus according to the second embodiment. FIG. 4B is a view for explaining the operation of the line type color inkjet recording apparatus according to the second embodiment. (C) Operation explanatory diagram for explaining the operation of the line type color inkjet recording apparatus according to the second embodiment (d) Operation of the line type color inkjet recording apparatus according to the second embodiment (E) Operation explanatory diagram for explaining the operation of the line type color inkjet recording apparatus according to the second embodiment (f) Line type color inkjet recording apparatus according to the third embodiment Operation explanatory diagram for explaining the operation of

FIG. 5 is a test pattern diagram showing a test pattern used in the line type color inkjet recording apparatus according to the second embodiment.

FIG. 6A is a perspective view showing a general line type inkjet head unit. FIG. 6B is a bottom view showing a general line type inkjet head unit.

7A is a partial plan view showing a general line type color inkjet recording apparatus. FIG. 7B is a partial side view showing a general line type color inkjet recording apparatus.

FIG. 8 is a block diagram showing a conventional line type color inkjet recording apparatus.

9A is an operation explanatory diagram for explaining the operation of the apparatus of FIG. 8; FIG. 9B is an operation explanatory diagram for explaining the operation of the apparatus of FIG.

[Explanation of symbols]

1 Ejection Port 2 Yellow Inkjet Head Unit 3 Magenta Inkjet Head Unit 4 Cyan Inkjet Head Unit 5 Black Inkjet Head Unit 6 Recording Paper 7, 8 Paper Conveying Rollers 2C, 4C Ejection Portion 4a Design Positions 21, 41 Recording position 100 Line type color inkjet recording device (line type color recording device) 101 Computer 102 Central control means 103 Storage means 104 Sensor 105 Actuator driving means 106 Actuator 107 Yellow head driving means 108 Magenta head driving means 109 Cyan head driving means 110 Black Head drive means 111 Power supply unit 112 Recording position correction means 113 Recording position correction data input means TP1, TP2 Test pattern N

Claims (10)

[Claims] 1. A plurality of line type recording head units provided corresponding to a plurality of basic colors are arranged in a direction in which a longitudinal direction intersects a recording medium conveying direction, and a plurality of line type recording head units are provided in the line type recording head unit. A recording position correction method in a line type color recording device having a recording head, comprising: a line type color recording device provided with a correction step for correcting a recording position of the recording head by correcting a recording timing of the recording head. Recording position correction method. 2. The recording position correction method in a line type color recording apparatus according to claim 1, wherein the correction of the recording timing is performed based on a plurality of recording position deviation data. 3. The recording position correction method in a line type color recording apparatus according to claim 2, wherein the correction of the recording timing is performed for each of the plurality of recording heads. 4. The recording position correcting method in a line type color recording apparatus according to claim 1, wherein the correction of the recording timing is performed by a correction function derived based on a plurality of recording position deviation data. 5. A recording position correction method in a line type color recording apparatus according to claim 4, wherein the correction of the recording timing is performed for each of the plurality of recording heads. 6. A plurality of line type recording head units provided corresponding to a plurality of basic colors are arranged in a direction in which a longitudinal direction intersects a recording medium conveying direction, and a plurality of line type recording head units are provided in the line type recording head unit. A line-type color recording apparatus equipped with a recording head, comprising line-position color recording means for correcting a recording position of the recording head by correcting recording timing of the recording head. 7. The line type color recording apparatus according to claim 6, wherein the recording position correction means corrects the recording timing based on a plurality of recording position shift data. 8. The line type color recording apparatus according to claim 7, wherein the recording position correction means corrects the recording timing for each of the plurality of recording heads. 9. The line-type color recording apparatus according to claim 6, wherein the recording position correcting means corrects the recording timing by a correction function derived based on a plurality of recording position deviation data. 10. The line-type color recording apparatus according to claim 9, wherein the recording position correcting means corrects the recording timing for each of the plurality of recording heads.