JPH03272873A - Correcting method for printing inclination of printer - Google Patents

Abstract

PURPOSE:To eliminate inclination of a main scanning line in a visual observation by linearly arranging a dividing main scanning line of main scanning line forming means in a direction perpendicular to a sub scanning line by altering an output timing to an image support, and outputting dividing pixel data for forming one line at the linearly arranged dividing main scanning lines to form an image on the support. CONSTITUTION:In an end face light emission type EL printer, dividing main scanning lines 381 - 38k obtained by dividing main scanning lines into a plurality of groups are provided corresponding to the inclination of a line head measured previously, the divided lines are linearly arranged in a direction perpendicular to the sub scanning direction by altering an output timing to an image support, and disposed at main scanning line forming position 35. Print data are converted to dividing pixel data divided into a plurality of groups at each pixel data for forming one line, data processed, and output to the corresponding lines 381 - 38k. The line light emission of a line head is performed at a predetermined timing at each group on the support to be sub scanned to form an image.

Description

[Detailed description of the invention] Industrial applications How to correct the print tilt of the machine.

The present invention relates to a method for correcting printing inclination of various printing apparatuses.

2. Description of the Related Art Printing devices currently in practical use use main scanning line forming means such as a line head or optical deflector provided with at least one active element to form a line on an image carrier that moves in a relative sub-scanning direction. An image is formed by continuously forming main scanning lines. For example, an electrophotographic line printer has a structure in which devices such as a charger, a line head, a developer, and a transfer device are arranged facing each other on the scanned surface -L of a photosensitive drum, which is an image carrier. The peripheral surface of the photosensitive drum, which is charged by the voltage applied by the device, is connected to the line head and is exposed by selective light emission from the active element to form a latent image, and this latent image is supplied from the developing device. An image is formed by developing it with toner, which is a developer, and transferring it to printing paper using a transfer device.

The active elements of the above-mentioned line head are generally LEDs (Light Emitting Diodes).
) has been used, but this has problems such as differences in characteristics between mass-produced elements and difficulty in manufacturing a line head with uniform emission intensity. Therefore, at present, active elements of line heads are edge-emitting type E L (E 1, RO I, UmineS
1, which is considered to use a
A line head using this edge-emitting z4Er element will now be described with reference to FIGS. 3 and 4.

Edge emission q E of this line head l 1. - As illustrated in FIG. 4, the cord 2 is arranged such that a thin active layer 3 made of zinc sulfide or the like containing active elements is inserted into the dielectric layer 4° 5 from below.
A flat plate electrode 6 is provided on the lower surface of these dielectric layers 4 and 5.
7 and emits ultra-flat light from the end face of the active layer 3, which is 100% smaller than the conventional EL in which the upper surface emits light.
It is possible to obtain approximately twice the luminous intensity. And the third
As illustrated in the figure, an edge-emitting EL element 2 having the above structure
The line head 1 can be connected to the line head 1 by using thin film technology or the like to connect the rod lens array (not shown) to the substrate 8.
is formed.

Therefore, for example, a line head 1, in which an AC power source 9 is connected to each edge-emitting EL element 2 via a switching element, is arranged to face the scanned surface of the photoreceptor together with a charger, a developer, a transfer device, etc. By doing this, the line printer ~
An edge-emitting type EL Puririn (not shown) can be manufactured.

However, when implementing such an edge-emitting type EL device or printer, since the edge-emitting type EL element 2 has an extremely large aspect ratio of the beam shape of the emitted light and is flat, a means for correcting this is required.

Accordingly, as a device that solves the above-mentioned problems, there is a device proposed by the present applicant in Japanese Patent Application No. 1-97081. Therefore, this device will be explained as a prior art printing device based on FIGS. 5 to 7.

In this printing device, an edge-emitting EL printer 10, two address counters 13.
14 and a reference clock 15 are connected, and a timing controller 17 is connected via a control circuit 16. In addition, the interface 12 has two RA!s, each of which is a line memory, each of which has three sleeve dates 18 to 21 connected to a human output section. y122, 23 via the first data processing circuit 24, and the R
A control circuit 16 and the address counter 13.11 are connected to the AM22.23 via a selector 25. Further, the RAM 22.23 is connected via the three-state circuit 20.21 to a second data processing circuit 26 to which the timing controller 17 is connected. The data processing circuit 26 also includes latches 27 to 27q and drivers 28 . . . . 28q to the protrusion electrode 30 . Shift register 3 connected to ~30n
1° to 31 (connected in parallel to 7.
The timing controller L7 is connected to the common electrodes 32, 32m of the line head 2D; the common driver 33, the latches 27, 27q, and the shift register 31. Connected to 31q.

Incidentally, mXn edge-emitting type EL elements 2 are arranged in series on the line head 29.

In such a configuration, this edge emission Wj E I
In the printer 10, print data including a clock signal inputted from the printer controller 11 via the interface 12 is compressed by processing such as rearrangement in the first data processing circuit 24, which is generally referred to as a main scanning line. .

Therefore, this compressed print data is stored in RAM22.2.
The print data is temporarily stored in one of the RAMs 23 and 3 during the printing time of one main scanning line, and at the same time, the stored print data is outputted at high speed from the other RAM 23 and 22 at 1111.

Here, print data is temporarily stored in F(A M22).

The selection of 23 is made from the printer controller 11 to at l,
- It is struck by the selector 25, which operates according to the timing manually input to the counter 13. Also, RAM23
．． 22 to 0 print data output is based on a reference clock of 15 or C.
This is done according to the control circuit 16 and address scalator 14 which operate in synchronization with the high-speed output reference clock signal issued by C).

Therefore, this output print data is reprocessed by the second data processing circuit 26 into a form suitable for printing, and the shift register 31. ~31q are sequentially output to latch 27. ~
Retained by 27q. And these members 31, 2
7ε common driver 33 and timing controller 1
Block electrode: 30. 30n and the common electrodes 32 and 32m, low voltage and high voltage drive pulses are repeatedly output to the line head 29 a predetermined number of times.

Therefore, in this edge-emitting type EL printer 10, as shown in the timing chart shown in FIG. is applied, and the operation described in I-8 occurs at time 1.
”.The line light emission of the line head 29 is repeated for one main scanning line.

By doing this, the flat pixel components formed by the device light emission of the edge emission type +E I and element -2 are arranged in succession in the sub-scanning direction, so that the edge emission type +E + is formed.

Even if the beam shape of the light emitted from the element 7-2 is flat, a substantially square pixel can be formed, as illustrated in FIG.
It is also possible to prevent jagged deviations at the edges of the main scanning lines from occurring in pixels due to minute deviations.

Problems to be Solved by the Invention 1111 and end 1iij light-emitting type)-': T-, the printer 10 performs main scanning with a c-knee line head 29 in a scanning direction 1'' of a photoreceptor that moves relatively in a sub-scanning direction. Lines are formed continuously and an image is printed.When manufacturing such a device, a light head 29 or a photosensitive disk
1. , The main scanning line 34 to be printed is tilted to the original main scanning line forming position 35), thereby degrading the image quality.

Furthermore, for example, a printing apparatus has been proposed in which a printing station in which a main scanning line forming means, a charger and a developing device are arranged facing a photosensitive drum is continuously arranged on a paper conveying belt. In such printing devices, a color image is formed by sequentially overprinting monochrome images on printing paper at multiple printing stations.
- If the main scanning line forming means of the main scanning line is tilted L/C with respect to the photosensitive drum, the overprinted main scanning lines 36 and 37 will be shifted as shown in Fig. 9. There is a G4 shift in the image Zuruko L 1. :1 becomes.

Furthermore, a printer (1''' shown in the figure) that performs high-speed printing by arranging multiple main scanning lines in parallel in the sub-scanning direction rl'i'+:x with the same structure as the above-mentioned printing device ε is also implemented. However, in this case as well, since the main scanning lines, which are consecutively arranged as in the above-mentioned image (2), are shifted, overlaps and omissions occur in the images.

Means of V) for Solving the Problem The invention as set forth in claim 1i￥L forms main scanning lines on an image bearing member which is provided with at least one active element and which is relatively moved in the sub-scanning direction. In a printing device equipped with a main scanning line forming means, the main scanning line of the main scanning line forming means and pixel data forming one line are divided into a plurality of groups to form divided main scanning lines, divided pixel data, etc. and main scanning line formation,
By changing the output timing of the divided main scanning line to the image carrier by 1°, the divided main scanning line of the means ``is linear c5[ in the direction perpendicular to the sub scanning direction
- Array (02, This linear form (- Arranged into 6 divisions - ↑ Output the divided pixel data forming one line / on the scanning line, respectively (
7 f#! Imo body hcxh image formation (5
61, 9 of claim 2! The brightness is at least one active element.
is provided, and the VC moves in the sub-scanning direction by 65 degrees f! In a printing apparatus equipped with a plurality of main water f-line forming means for forming main scanning lines on a carrier, at least one main scanning line and a pixel forming one line of one main scanning line forming means are used. Divide the image into a plurality of 0 groups 1. Form r divided main scanning lines and divided pixel data 7 Change the output timing of aligning the divided main scanning lines of the main scanning line forming means with the image carrier The divided pixel data is arranged linearly in a direction perpendicular to the vertical scanning direction and the sub-scanning direction, and divided pixel data forming a divided main scanning line created by the linear arrangement is outputted to form an image by a plurality of main scanning line forming means. The positions are now synchronized.

The invention according to claim 1 divides the main scanning line of the main scanning line forming go stage and the pixel data forming the i-line into a plurality of groups, and generates the divided scanning lines and divided pixel data. death,
By changing the output timing of the scanning line forming means to print the divided main scanning lines on the image 111 carrier, the divided main scanning lines arranged in a straight line in a direction at an angle to the sub-scanning direction (1). The divided pixels forming one line in the scanning line are outputted respectively, and an image is formed on the image carrier at step 7.
From ix-, the inclination of the main scanning line of "isoscopic"- is eliminated. ′
What C-kiru.

The invention according to claim 2 divides the main scanning line of at least one main scanning line forming means and the pixel data forming one line into a plurality of groups to form divided main scanning lines and divided pixel data, The divided main scanning lines of the main scanning line forming means are arranged in a straight line in a direction perpendicular to the sub-scanning direction by changing the output timing of directing them to the image carrier, and one line is added to the divided main scanning lines arranged in a straight line. By outputting the divided pixel data forming each main scanning line and synchronizing the image forming position of each main scanning line forming means, a plurality of main 71 scanning line forming stages 1' each form a main scanning line. Line positions can be synchronized.

Embodiment An embodiment of the invention claimed in claim 1 will be explained based on the 11th PI. The edge-emitting type F-shoulder illustrated in the figure has a structure substantially similar to that of the printer 10, and the print data input from the printer D-1-U color 11 divides the pixel group forming the main scanning line. The plurality of grooves are sequentially output to a line head 29, which is main scanning line forming means, at different timings. In other words, in the edge-emitting type EI and printer of this embodiment, as shown in the figure, the line head 2 is measured in advance.
Divided main scanning lines 38 to 38k are set by dividing the main scanning line into a plurality of groups corresponding to the slope of 9 ((1).Here, these divided upper scanning lines 38 and -38 are , are arranged in a straight line in a direction perpendicular to the sub-scanning direction by changing the output timing to the image carrier, and each main scanning line forming position 3 is
It is located above 5. Then, the print data is converted into divided pixel data that is divided into multiple groups according to the pixel data that forms one line, and data processing such as replacement with the previous and subsequent divided pixel data is performed to make each corresponding division. It is output to the scanning lines 38 to 38k. (Here, the line light emission from the line ha and rad 29 is outputted at a predetermined timing for each group onto the image carrier that moves relatively in the sub-scanning direction, thereby forming an image. The main scanning line 38 is as illustrated in FIG.
Each divided main scanning line 38. 38 are inclined in the same direction as the line head 29, but both are located at the main scanning line forming position 35.
Since it is located above the conventional main scanning line 3 illustrated in FIG.
Compared to 4, the visual inclination is eliminated.

Note that, as described above, the divided main scanning lines 38.
As a specific means for outputting .about.38k at different timings, latch 27. -・27q empty driver 28. ~
- Timing controller 17 transfers data to 28q
This can be easily achieved by controlling the timing with . Also, on the divided main scanning lines 38, -; 38 shown in t-1 (j,
[n+2], [n
σ] is formed by a timing difference of a predetermined clock, such as I], but this timing difference can be adjusted steplessly.
, to 38 in the sub-scanning direction precisely. Furthermore, the illustrated divided main scanning line 38
．． ~.:38 is divided into four parts, but it is also possible to increase or decrease the number of divisions depending on the slope of the line head 29 that inscribes the image carrier. For example,
By individually controlling the timing of each edge-emitting type E I and element 2 of the line head 29, it is also possible to form a linear, non-slanted main scanning line (not shown). In the example, the printing device is an edge-emitting type Y.:14.
Although the present invention is assumed to be a printer, the present invention is not limited to the above 9-distribution type, but is applicable to a printing device that forms an image by continuously arranging main scanning lines in the sub-scanning directions j and V'. For example, it can be applied to a laser printer using an optical deflector.

An embodiment of the invention set forth in claim 2 will be described based on FIG. 2. The printing inclination correction method of this embodiment is used, for example, in a printing device in which a plurality of printing stations are arranged consecutively on a paper conveying belt to enable color printing and high-speed printing, and is similar to the above-mentioned method. 0 JIE formed by a predetermined main scanning line forming means in the same manner as in the embodiment of the invention claimed in claim 1.
By dividing the scanning line into a plurality of parts and printing them at main scanning line forming positions, the relative positions of the main scanning lines formed by the plurality of main scanning line forming means are adjusted. Therefore, G:i L, is overprinted like this, and I′-1 for color image.
:, scanning lines 36, 39 . 39, as illustrated in the figure, divided main scanning lines 39. -39k is located on the main scanning line forming position 35 and is printed overlappingly with each other t scanning line 36, as shown in FIG.
It is obvious that the chromatic difference 1+ in a color image is reduced even in 7 compared to 7. Note that the present invention is advantageous in that the line forming child stage forms a plurality of t scans as described above. ) Since the positions can be synchronized, a printer (not shown) that performs high-speed printing by forming lines consecutively in the sub-scanning direction using multiple main-scanning line forming means (not shown) improves print quality. It is also possible to cause a fire.

Effects of the Invention The invention as set forth in claim 1 provides a printing system that is provided with a t-scanning line forming J'''-stage for forming main scanning lines on an image carrier that is provided with at least one active element and that moves relatively in the sub-scanning direction. In the apparatus, main scanning line formation - forming one line with one stage of main scanning line 4 Pixel data L is formed with a plurality of horizontal scanning lines and one line 4
Divide the pixel U' to D into a plurality of loops to form division 1: scanning lines and divided pixel data, and output timing of the division 1 scanning line of the main scanning line forming means to one image carrier. With the change of 9±, sub-scanning is performed in a direction perpendicular to the direction C in a straight line. In order to form an image on the image-bearing potting soil (5'2), it is possible to eliminate the inclination of the main t and intermediary lines of visual inspection, and to easily improve the printing quality of the printing device. It is possible to raise the height by "1" (V = 1), and after the main scanning line forming means, image carrier, etc. are assembled into the device, the inclination between the parts can be compensated by the circuit 1'7) control. Therefore, it is possible to improve the productivity of the printing device.
The invention described above provides a printing apparatus including a plurality of main scanning line forming means for forming main scanning lines on an image carrier that is provided with at least 0 active elements and that moves relatively in the sub-scanning direction;
dividing into at least - main scanning line formation °F main groups to form divided main scanning lines and divided pixel data;
The divided main scanning lines of the main scanning line forming means are arranged in a straight line in the direction ζ perpendicular to the direction of the sub-scanning horn without changing the output timing to the image carrier. Output each divided pixel data forming one scanning line; 4. By synchronizing the image forming arrangement of each main scanning line recording (stage), it is possible to synchronize the positions of the I-scanning lines formed by the plurality of main scanning line forming means, respectively. Precisely print multiple main scanning lines (: 1 overprint)
It has effects such as reducing color shift in color images, and making it possible to improve the print quality of high-speed printing by precisely connecting multiple main scanning lines in the sub-scanning direction1.
,

[Brief explanation of drawings]

FIG. 1 is a front view along main scanning lines showing an embodiment of the invention claimed in claim 1, FIG. 2 is a front view along main scanning lines showing an embodiment of the invention claimed in claim 2j, and FIG. A perspective view of an edge-emitting type E I-element, Figure 4, and a perspective view of the element, Figure 1
-97081 Figure 6 is a block diagram showing the circuit structure of the printing device applied for by M-'r as CJ. -＼Chat, FIG. 7 is a JE front view of the printed image. FIGS. 8 and 9 are main scanning lines showing an example of a reverse i)-face 1). :29...Main scanning line forming means, 35...1. Scanning line formation position, 36...Main scanning line, 38.39...Divided main scanning line Goni;A, :Canko I ~尤Z12) First true continuation Int C1-' Identification symbol number 5 33/12 Feather 15 3

Claims (2)

[Claims] 1. In a printing apparatus comprising a main scanning line forming means for forming a main scanning line on an image carrier that is provided with at least one active element and moves relatively in a sub-scanning direction, the main scanning line of the main scanning line forming means and one Pixel data forming a line is divided into a plurality of groups to form divided main scanning lines and divided pixel data, and the divided main scanning lines of the main scanning line forming means are changed by changing the output timing to the image carrier. The divided pixel data are arranged linearly in a direction perpendicular to the sub-scanning direction, and form an image on the image carrier by outputting each divided pixel data forming one line in the divided main scanning lines arranged linearly. A method for correcting printing inclination of a printing device, characterized in that: 2. In a printing apparatus including a plurality of main scanning line forming means for forming main scanning lines on an image carrier that is provided with at least one active element and that moves relatively in the sub scanning direction, the main scanning line forming means of at least one main scanning line forming means is A line and pixel data forming one line are divided into a plurality of groups to form divided main scanning lines and divided pixel data, and output timing of the divided main scanning lines of the main scanning line forming means to the image carrier is determined. By changing the above, the divided pixel data are arranged linearly in a direction perpendicular to the sub-scanning direction, and the divided pixel data forming one line are outputted to each main scanning line forming means. A method for correcting printing inclination of a printing device, characterized in that image forming positions are synchronized.