JPH0262863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color image recording device, and particularly to a color image recording device that is clear and has little color shift.

2. Description of the Related Art A known color image recording device sends an electric signal to a set of multipolar electrostatic recording heads, which are latent image forming means, to form positive and negative electrostatic latent images on a recording paper made of an electrostatic recording sheet. A dot is formed, two types of colored toners of different colors are charged to different polarities, and developed by being attached to the electrostatic latent image dot, and this is fixed by heating etc. to form two visible colors. A method to create a statue has been announced.

However, with this method, multicolor recording of more than two colors is not possible, and forming an electrostatic latent image of positive polarity on recording paper is more difficult than forming an electrostatic latent image of negative polarity. There were drawbacks such as a low probability of dot formation.

Therefore, the conventional monochrome recording using only a negative electrostatic latent image is repeated multiple times by synchronizing the recording position and changing only the toner color to perform color recording in three or more colors. Color image recording devices are possible.

FIG. 4 is a simplified perspective view of essential parts of an example of a color image recording apparatus according to the conventional concept, and FIG. 5 is a control block diagram as well. A recording paper 1 made of an electrostatic recording sheet is connected to a drive motor 3 and this drive motor 3.
It is configured to be driven along a predetermined path in the direction of arrow A, which is the forward direction, and in the opposite direction thereof, by a conveyance means consisting of paper feed rollers 2a and 2b, which are driven by. A pulse generator PG4 is directly connected to the drive motor 3, and generates PG pulses according to the rotation of the drive motor 3, that is, every time the recording paper 1 moves a certain distance. A multi-needle electrode electrostatic head 6 is a latent image forming means for forming electrostatic latent image dots on the recording paper 1 along a predetermined path of the recording paper 1.
Further, a plurality of developing devices (red developing device 7a, blue developing device 7b, yellow developing device 7c) to which developing solutions of respective colors are supplied are provided downstream in the conveyance direction of the recording paper 1.
is provided. Further, a fixing device 8 is provided downstream of the plurality of developing devices. The multi-needle electrode electrostatic head 6 spreads over the entire width of the surface of the recording paper 1 at an angle of 0.1
Electrostatic latent image dots having negative polarity are selectively formed at mm intervals according to commands from the control device 9.
The red developing device 7a, the blue developing device 7b, and the yellow developing device 7c develop the electrostatic latent image with red, blue, and yellow toners according to instructions from the control device 9, respectively, and the fixing device 8 is also controlled by the control device 9. Recording paper 1 passing under it according to the command of device 9
By heating the toner, the toner is melted and fixed. The image data storage device 10 stores data in which the image to be recorded is separated into red, blue, and yellow hues at intervals of 0.1 mm, corresponding to the positive traveling direction of the recording paper 1 for each red, blue, and yellow hue. stored in order. The counter 11 is for generating synchronous timing pulses, and the recording paper 1 is 0.1mm
PG while the drive motor 3 rotates to
A timing pulse is sent to the control device 9 every time n (constant) PG pulses generated by 4 are received.

The manner in which color images are recorded by this conventional apparatus will be described below. When an instruction to start recording is given to the control device 9, the control device 9 issues a command to the drive motor 3 to rotate in the forward direction, and at the same time retrieves the data of the first column of red from the image data storage device 10 and performs multiple operations according to the data. Issue a command to the needle electrode electrostatic head 6,
Electrostatic latent image dots are formed on the surface of recording paper 1. Furthermore, an operation command is sent to the red developing device 7a and the fixing device 8 at the same time. As the drive motor 3 that conveys the recording paper 1 rotates, a counter 11 counts the PG pulses emitted from the PG 4 directly connected to it.
A timing pulse is generated every time n PG pulses are received. Every time the control device 9 receives a timing pulse from the counter 11, it sequentially retrieves data from the image data storage device 10, issues a command to the multi-needle electrode electrostatic head 6 according to the data, and prints the data on the surface of the recording paper 1. An electrostatic latent image dot is formed. At the same time, the control device 9 counts the number of received timing pulses in a built-in register.
In this way, the data for the red color of the image to be stored stored in the image data storage device 10 is as follows:
on the surface of recording paper 1 being sent out in the direction of arrow A.
recorded as electrostatic latent image dots spaced at 0.1 mm intervals,
When the recorded area reaches the red developing device 7a, it is developed with red toner, and when it further reaches the fixing device 8, it is heated and fixed. When the control device 9 reads information indicating the END of red data from the image data storage device 10, data is not read from the image data storage device 10 even if a timing pulse is received from the counter 11.

When the installation interval between the multi-needle electrostatic head 6 and the fixing device 8 in the moving direction of the recording paper 1 is Lmm, the number of PG pulses generated by the PG 4 while the recording paper 1 moves this distance is n×L/0.1. Since the number of timing pulses generated by the counter 11 is L/0.1, the information indicating the END of the red data is transmitted to the control device 9.
After reading, the recording paper 1 is continued to be fed until it receives L/0.1+δ timing pulses, which is slightly more than the number of timing pulses mentioned above, and then the motor 3 is stopped, thereby developing and fixing the red record to be recorded. All completed. At the same time as the control device 9 stops the drive motor 3, the operation commands to the red developing device 7a and the fixing device 8 are also stopped. At this time, it is assumed that the number of contents of the timing pulse counting register in the control device 9 has become Z.

After the drive motor 3 is stopped upon completion of fixing the red recording as described above, the drive motor 3 is immediately reversed to drive the recording paper 1 in the direction opposite to the arrow A. At this time, the counter 11 generates a timing pulse every time it receives n PG pulses from the PG 4, and subtracts it from the timing pulse counting register in the control device 9. When the contents of the register become 0, the drive motor 3 is stopped. In this way, the recording paper 1 is stopped so that the portion where the red color is first recorded is positioned directly below the multi-needle electrode electrostatic head 6.
However, in order to accurately stop the recording paper 1 at the starting point in this manner, it is necessary to also use a speed loop to accurately control the speed.

Next, the control means 9 issues a command to rotate the drive motor 3 in the normal direction, and at the same time retrieves the data of the first row of blue color from the image data storage device 10 and issues a command to the multi-needle electrode electrostatic head 6. At the same time as forming electrostatic latent image dots on the surface of the completed recording paper 1, an operation command is sent to the blue developing device 7b and the fixing device 8. Thereafter, as in the case of red recording, the control means 9 sequentially retrieves blue image data from the image data storage device 10 every time it receives a timing pulse from the counter 11, and uses the multi-needle electrode electrostatic head 6 to read the blue image data from the surface of the recording paper 1. to form electrostatic latent image dots. When the recorded area reaches the blue developing device 7b, it is developed with blue toner, and when it further reaches the fixing device 8, it is heated and fixed. At this time, the previously fixed red toner is also remelted by the heat, so in the overlapping area of the red toner and blue toner, the blue toner is mixed with the red toner, resulting in subtractive color mixing. When the control means 9 reads the information indicating the END of the blue data from the image data storage device 10, the reading of the image data is stopped as in the case of red recording, and then the recording paper 1 is further read by L/0.1+.
δ timing pulse reception periods are sent to complete the development and fixing of the blue recording, and the blue developing head 7
b and the fixing device 8 are stopped, and
The drive motor 3 is reversed to return the recording paper 1 to the starting point and start the next recording.

The yellow recording is the same as the blue recording except that the yellow developing device 7c is used instead of the blue developing device 7b, so a description thereof will be omitted.
After reading the information indicating , the recording paper 1 is further sent for L/0.1+δ timing pulse reception periods to complete the fixing of the yellow recording, thereby completing all multicolor recording.

Problems to be Solved by the Invention However, with this configuration, there is a problem in that color misregistration occurs in each color in the conveying direction of the recording paper, resulting in a color image that is not suitable for practical use.

The above problem arises for the following reasons. In other words, since the recording paper is moved back and forth along a predetermined path for each color as described above, the recording paper is subtly affected by humidity, the conveying force of the recording paper, etc. during the series of recording and development processes. This is because it expands and contracts in whole or in part. This expansion and contraction poses almost no problem when recording small-sized color images, but A1, A0
In a color image recording apparatus that handles large-sized recording paper, this can cause large color misregistration.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a color image recording device that can prevent color shift due to expansion and contraction of recording paper, and can obtain clear color images with less color shift. With the goal.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a conveyance means for reciprocating or circulating a recording medium along a predetermined conveyance path, and a conveyance means for conveying a recording medium in a reciprocating or circular manner along a predetermined conveyance path, and a latent image forming means for forming registration marks at approximately equal intervals in a recording medium conveyance direction and forming a latent image corresponding to a recorded image line by line in accordance with a predetermined recording cycle within an image recording area on the recording medium; , a plurality of developing means for visualizing the latent image formed on the recording medium by the latent image forming means, and a plurality of developing means that actuate the conveying means to form and develop the latent image on the same recording area of the recording medium. a recording control means for forming a composite color image by repeating the process multiple times for each color; a detection means for sequentially detecting the registration marks when forming a latent image corresponding to the recorded image; and a detection means for detecting the registration marks. measuring means for measuring the interval between the registration marks based on the detection result of the detecting means, and a measuring means for measuring the interval between the registration marks based on the detection result of the detecting means; and timing control means for adjusting the recording position of each color recorded image.

Effects The present invention has the above-described configuration, and in order to sequentially correct the latent image forming position of each color based on the expansion and contraction in the conveyance direction of the recording medium based on the detection result of the registration mark formed on the recording medium when performing recording,
It is possible to prevent color shift due to expansion and contraction of the recording medium and obtain clear color images.

Embodiment FIG. 1 shows a schematic configuration of a color image recording apparatus according to an embodiment of the present invention, and FIG. 2 is a control block diagram as well, and the same reference numerals as in FIGS. 4 and 5 are the same. Or indicates parts that have the same function.

The recording paper 1 is driven along a predetermined path in the direction of arrow A and in the opposite direction by a conveyance means consisting of a drive motor 3 directly connected to the PG 4 and paper feed rollers 2a and 2b driven by this drive motor 3. As in the conventional structure, each of the multi-needle electrode electrostatic heads 6 is a latent image forming means for forming electrostatic latent image dots on the recording paper 1 in order along a predetermined path of the recording paper 1. A plurality of developing devices (a red developing device 7a, a blue developing device 7b, and a yellow developing device 7c) each supplied with a developer of each color and a fixing device 8 are provided. In the case of this device, registration marks are formed on the recording paper 1 at equal intervals in the recording paper transport direction on a portion outside the normal image recording area, and are used as detection means for reading the registration marks when recording images of the second and subsequent colors. A reader 5 is provided upstream of the multi-needle electrode head 6 in the recording paper transport direction.

A counter 11' generates timing pulses for synchronous recording, a counter 12 mainly counts timing pulses between read registration marks, a calculator 13, and a counter 14 mainly counts timing pulses between read registration marks. It is used to monitor the writing of the mark and the interval between the read marks, and also performs the operation of forming an electrostatic latent image dot along with the counter 14' in alignment with the center position of the mark. The operation is controlled by a control device 9'.

That is, counters 11', 12, 14, 14',
The arithmetic unit 13 and the control device 9' function as timing control means for aligning the recording positions of the electrostatic latent image dots corresponding to each color in the conveying direction of the recording paper based on the interval between the registration marks.

A registration mark image pattern for recording a registration mark outside the regular image recording area near the side edge of the recording paper 1 using the multi-needle electrode electrostatic head 6 is stored in the control device 9'. In this device, this registration mark is a solid circle with a diameter of 1 mm, and is recorded simultaneously only when the first color image is recorded, but every time the first color image receives n PG pulses, In the device, recording paper 1 is 0.1
While the registration mark is recorded every time the image is moved by mm, the registration mark is recorded every time n×k=N PG pulses are received according to this image recording mode. In this device, k=100 is set, and recording paper 1 is
It is configured to record every 10mm of movement.

Due to the elasticity of the recording paper 1 used, as mentioned above,
When the number of PG pulses to be sent is N+α when the length of N PG pulses is extended to the maximum, the mark reader 5 sends the number of PG pulses in front of the multi-needle electrode electrostatic head 6. They are placed N+α apart (see Figure 3). In addition, the number of PG pulses to be sent for the length when the recording paper 1, which has a length of L mm from the multi-needle electrode electrostatic head 6 to the fixing device 8, is stretched to the maximum is (L・N/10) + β. shall be.

As described in the explanation of FIGS. 4 and 5, the image data storage device 10 stores image data for each hue of red, blue, and yellow.

Hereinafter, aspects of multicolor recording by this apparatus will be explained.

When an instruction to start recording is given to the control device 9', preparations are made for recording the first color, that is, red. First, the number N of PG pulses for the registration mark recording interval is set in the counter 14 and the arithmetic unit 13, and then,
The arithmetic unit 13 performs the calculation N/k=n and sets the result n in the counter 11'. As a result, the counter 11' generates a timing pulse every time it receives n PG pulses.

After the above preparation is completed, the control device 9' issues a normal rotation command to the drive motor 3 to start feeding the recording paper 1 in the direction of the arrow A, and at the same time, according to the registration mark image pattern stored in the built-in memory, a solid sheet of 1 mm in diameter is A signal that is to become a circular registration mark image begins to be transmitted to the multi-needle electrode electrostatic head 6. Furthermore, at the same time, the control device 9' sends operation commands to the red developing device 7a containing red toner and the fixing device 8.

The counter 11' starts counting when the drive motor 3 starts rotating, and the counter 11' starts counting when the drive motor 3 starts rotating.
A timing pulse is generated every time n PG pulses are received from the recording paper 1, and the control device 9' sends the registration mark image signal to the multi-needle electrode electrostatic head 6 in synchronization with this timing pulse. Electrostatic latent image dots having negative polarity are formed near the edges. The shape of the registration mark image to be formed is a 1 mm solid circle, but as described above, in this apparatus, one line is 0.1 mm, so the registration mark image is sequentially formed with 10 lines.

When the recording paper 1 is advanced by 0.5 mm, that is, when the control device 9' receives the fifth timing pulse from the counter 11', it retrieves the first data of the red image from the image data storage device 10 and records the center position of the registration mark. A red image line signal is sent to the multi-needle electrode electrostatic head 6 at the same time as the registration mark signal. Thereafter, every time the control device 9' receives timing pulses emitted from the counter 11' at intervals of n PG pulses, the control device 9' sequentially retrieves data from the image data storage device 10, and controls the multi-needle electrode electrostatic head according to the data. 6, and while the registration mark image pattern continues, only the red image is formed as electrostatic latent image dots on the surface of the recording paper 1 at intervals of 0.1 mm, together with the registration marks.

On the other hand, the counter 14 also starts counting when the drive motor 3 starts rotating, and emits a timing pulse every time it receives N PG pulses from the PG 4, and the control device 9' synchronizes with this timing pulse to generate a PG pulse. Formation of the above-mentioned registration mark images is started at intervals corresponding to N pieces. Therefore, in the registration mark image, the number of PG pulses for recording paper 1 is N.
Each time each piece is sent, it will be recorded sequentially.

The electrostatic latent image dots of the above-mentioned red image and registration mark recorded on the surface of the recording paper 1 at 0.1 mm intervals are developed with red toner when the recorded portion reaches the red developing device 7a. Fuser 8
When it reaches that part, it is heated and fixed.

When the control device 9' reads information indicating red data END from the image data storage device 10, it prevents reading of data from the image data storage device 10 even if a timing pulse is received from the counter 11', and the counter 14 After the multi-needle electrode electrostatic head 6 has completed recording the electrostatic latent image dot of the last registration mark, the counter 14 is cleared once and a new (LN/
10) Set +β.

Thereafter, the drive motor 3 continues to rotate normally to perform red color development and fixing, and when the counter 14 receives (L・N/10)+β PG pulses, the drive motor 3
to stop feeding of recording paper 1. As mentioned above, this (L・N/10)+β is the number of PG pulses corresponding to the length of the multi-needle electrode electrostatic head 6 and the fixing device 8 when the recording paper 1 is stretched to the maximum. Even when the end information is read, the recording paper 1 is conveyed by a certain amount. Therefore, even if the recording paper 1 is stretched to the maximum due to its elasticity, the above operation ensures that all the red images and registration mark images are completely fixed.

Simultaneously with the stop of the drive motor 3, the control device 9' also stops the operation commands to the red developing device 7a and the fixing device 8, and then starts feeding the recording paper 1 in the direction opposite to the arrow A, causing the drive motor 3 to reverse. A reading start command is issued to the mark reader 5. The mark reader 5 is configured to generate a registration mark signal and send it to the control device 9' when the recording paper 1 is fed and the center of the registration mark recorded in red on the side edge of the paper comes directly below it. .

When the control device 9' receives the first registration mark signal, it changes the set value (L・N/10) of the counter 14.
Clear +β. After that, N+α is newly set, and the number of PG pulses of the counter 14 at the registration mark signal reception interval is counted every time a registration mark arrives, and when this exceeds N+α, the drive motor 3
stop the reversal. That is, the recording paper 1 is fed backwards until the registration marks formed on the side edges outside the image recording area of the recording paper 1 disappear, and the center of the first red registration mark is directly below the mark reader 5. The system will stop the train after confirming that it has passed.

FIG. 3 is a plan view of the recording paper 1 when the recording of the first color red image is completed and the pulling back of the recording paper is completed, and the mark reader 5 and the multi-needle electrode electrostatic head are shown when the reverse feeding is completed. The relative position with respect to 6 is shown for reference by the corresponding number of PG pulses. The interval N between the registration marks 15 recorded on the side edges is the one at the time of recording, and is not the correct N after recording and fixing is completed. In other words, since the recording paper expands and contracts under the influence of humidity, recording paper conveyance force, etc. during the recording and development process, the interval between them expands and contracts (maximum N+α). However, since the recording paper expands and contracts uniformly, it can be assumed that the expansion and contraction of the recording paper 1 in the feeding direction does not change in both the red image 16 and the registration marks 15.

Next, preparations are made for recording the second color, that is, blue. The control device 9' first sets N+α, which is the number of PG pulses corresponding to the distance between the mark reader 5 and the multi-needle electrode electrostatic head 6, in the counter 14, issues a reading start command to the mark reader 5, and starts the drive motor. 3 in the forward direction and record paper 1 in the direction of arrow A.
At the same time, an operation command is sent to the blue developing device 7b containing blue toner and the fixing device 8.

When the center of the first registration mark comes directly under the mark reader 5, the mark reader 5 sends a registration mark signal to the control device 9', and when the control device 9' receives the registration mark signal, the set value N+
The counter 14 to which α has been set and the counter 12 which has been cleared to zero are instructed to start counting PG pulses.

When the center of the next (second) registration mark comes directly under the mark reader 5 and the control device 9' receives the registration mark signal, the counter 12 calculates the actual value PG between the counted registration marks.
After sending the number of pulses N'(1) to the calculator 13, it is cleared to zero again until the next (third) registration mark.
Start counting the number of PG pulses. At the same time, N+α is set in the counter 14', which is in a stopped state, and a command is given to start counting. In other words, the counter 14 and the counter 14' operate alternately. The arithmetic unit 13 that received the number of PG pulses N'(1) calculates N'(1)/k=
Compute n′(1) and hold n′(1).

The number of PG pulses counted by the counter 14 is N+α
When this happens, a signal is sent to the control device 9' to stop counting. At this time, the recording paper 1 is fed in the direction of arrow A.
Since the center of the first registration mark above has just arrived at the position of the multi-needle electrode electrostatic head 6, the control device 9' retrieves the first data of the blue image from the image data storage device 10 and sets the multi-needle electrode electrostatic head 6. Electrostatic head 6
Recording paper 1 on which the red image has already been fixed.
At the same time, n'(1) held in the arithmetic unit 13 is transferred to the counter 11'.
and instructs the counter 11' to start operation.

In response to the operation start command from the control device 9', the counter 11' starts emitting a timing pulse every time it receives n'(1) PG pulses from the PG4.
Each time the control device 9' receives a timing pulse from the counter 11', the control device 9' sequentially updates the image data storage device 1.
Data is extracted from 0 and a command is sent to the multi-needle electrode electrostatic head 6 according to the data.

When the center of the next (third) registration mark comes directly under the mark reader 5, the counter 12 sends the number of PG pulses N'(2) between the new registration marks to the calculator 13, and PG between marks
Start counting the number of pulses, and the calculator 13 is new.
In addition to calculating and holding n'(2), N+α is set to the counter 14 which is in a stopped state, and a command is given to start counting. Arithmetic unit 1 that received the number of PG pulses N′(2)
3 calculates N'(2)/k=n'(2) and holds n'(2).

When the recording paper is further conveyed and the number of PG pulses counted by the counter 14' reaches N+α, the counter 1
4' sends a signal to the control device 9' to stop counting. At this time, the center of the second registration mark on the recording paper 1 that is being fed in the direction of arrow A has just arrived at the position of the multi-needle electrode electrostatic head 6, and the controller 9'
extracts the data of the subsequent blue image from the image data storage device 10 and sends it to the multi-needle electrode electrostatic head 6 to form an electrostatic latent image dot on the surface of the recording paper 1, and also to form an electrostatic latent image dot on the surface of the recording paper 1, (2) is sent to the counter 11' to instruct the counter 11' to start operation. With this operation start command, counter 1
1' starts to emit a timing pulse every time n'(2) PG pulses are received from the PG4, and the control device 9' sequentially emits a timing pulse from the image data storage device 10 every time it receives a timing pulse from the counter 11'. Data is extracted and commands are sent to the multi-needle electrode electrostatic head 6 according to the data.

Thereafter, when the PG pulse count value of either the counter 14 or 14' reaches N+α, a signal is issued to the control device 9', and at that time, the registration mark at the position of the multi-needle electrode electrostatic head 6 and the next registration mark are The timing pulse interval n'(x) corresponding to the measured length of the recording paper 1 is always the counter 1.
1', and electrostatic latent image dots of the second color, that is, blue, are sequentially formed at positions substantially synchronized with the recorded images of the first color, that is, red.

When the surface of the recording paper 1 where the electrostatic latent image dots are formed reaches the blue developing device 7b, it is developed with blue toner, and when it reaches the fixing device 8, it is heated and fixed. At this time, the previously fixed red toner is also remelted by the heat, so in the overlapping area of the red toner and blue toner, the blue toner is mixed with the red toner in subtractive color.

When the control device 9' reads the information indicating the blue data END from the image data storage device 10, it prevents reading of data from the image data storage device 10 even if a timing pulse is received from the counter 11', and the counter 14 To (L・N/
10) Set +β. This operation is similar to the case of recording a red image.

Thereafter, the drive motor 3 continues to rotate normally to perform blue development and fixing, and when the counter 14 receives (L・N/10)+β PG pulses, the drive motor 3
After the fixing of all the blue images is completed by stopping the operations of the blue developing device 7b and the fixing device 8, the recording paper 1 is fixed by the same procedure as explained earlier when the fixing of the red image is completed. is fed backwards, and after confirming that the center of the first red registration mark has passed directly under the mark reader 5, it is stopped.

Subsequently, the third color, that is, yellow image recording is performed, but the detailed explanation will be omitted since the procedure for recording a blue image only involves changing the developing device to be operated from the blue developing device 7b to the yellow developing device 7c. At the same time as recording the first color, i.e., red image, the distance between the registration marks, which were placed at equal intervals using pulses proportional to the paper feed amount, when recording the yellow image, was actually measured.
Recording of the yellow image is completed at timing pulse intervals corresponding to the actually measured length of the recording paper 1 in synchronization with the position of the registration mark.

Therefore, the red, blue, and yellow multicolor recordings electrostatically recorded three times by the monochromatic recording method have almost no color shift. Although this example describes multicolor recording using three colors, it is obvious that the same method can be applied to any multicolor recording apparatus using two or more colors.

In the case of this device, the recording start position for the second and subsequent colors is calculated from the position of the first registration mark read by the mark reading device 5, so when the recording paper 1 is fed backwards and then stopped, the accurate position can be determined. There is no need to stop at any point, and there is no need for complicated speed control such as using a speed loop.

In this embodiment, the shape of the registration mark is a solid circle with a diameter of 1 mm, but the shape is not limited to this and may be any shape or size. However, if it is too small, there is a risk of misidentifying contaminants attached to the surface of the recording paper 1, so it is desirable to have a certain size.

Further, in this embodiment, the registration mark 15 was recorded simultaneously with the first color red image, but this method is not limited to this method. Only the registration mark may be formed before image recording, or the registration mark 15 may be formed in advance. The color image recording apparatus according to the present invention can also be realized using recording paper.

The case where the recording paper is repeatedly reciprocated has been described in detail as an example. However, by repeating the reciprocating movement of the recording paper, it is possible to maintain the technical idea of the present invention and improve the clarity and color shift. It will be easily understood that it is possible to realize a color image recording device with less.

Effects of the Invention As is clear from the above description, the present invention provides a conveyance means that reciprocates or circulates a recording medium along a predetermined conveyance path, and a conveyance means for conveying the recording medium outside an image recording area on the recording medium. a latent image forming means for forming registration marks at approximately equal intervals in a direction and forming a latent image corresponding to a recorded image line by line in accordance with a predetermined recording cycle in an image recording area on the recording medium; A plurality of developing means for visualizing the latent image formed on the recording medium by the image forming means, and forming the latent image on the same recording area of the recording medium by operating the conveying means multiple times for each color. a recording control means that repeatedly forms a composite color image; a detection means that sequentially detects the registration mark when forming a latent image corresponding to the recorded image; and a detection means that detects the registration mark each time the detection means detects the registration mark. a measuring means for measuring the interval between the registration marks based on the detection result of the measuring means; and a measuring means for measuring the interval between the registration marks based on the detection result of the measuring means; By providing a timing control means for aligning the recording position, it has an excellent effect of preventing color shift of recorded images of each color due to expansion and contraction of the recording medium and obtaining a clear color image.

[Brief explanation of drawings]

FIG. 1 is a simplified perspective view of essential parts of an embodiment of a color image recording device according to the present invention, FIG. 2 is a control block diagram, and FIG. 3 shows completion of recording of the first color red image. FIG. 4 is a simplified perspective view of the main parts of an example of a color image recording device according to the conventional concept, and FIG. 5 is a control block diagram of the same. be. 1...Recording paper, 3...Drive motor, 4...Pulse generator (PG), 5...Mark reader, 6...Multi-needle electrode electrostatic head, 7a...Red developer, 7b...Blue developer, 7c...Yellow developer Device, 8... Fixing device, 9,9'...
Control device, 10... Image data storage device, 11, 1
1', 12, 14, 14'...Counter, 13...Arithmetic unit, 15...Registration mark, 16...Red image.

Claims (1)

[Claims] 1. A conveying means that reciprocates or circulates a recording medium along a predetermined conveyance path, and forms registration marks at approximately equal intervals in the recording medium conveyance direction outside an image recording area on the recording medium, and the recording medium. a latent image forming means for forming a latent image corresponding to a recorded image line by line according to a predetermined recording cycle in an image recording area on a medium; and a latent image formed on the recording medium by the latent image forming means. a plurality of developing means for visualizing the image, and a recording control means for forming a composite color image by operating the conveying means and repeating latent image formation and development for each color multiple times in the same recording area of the recording medium. a detection means for sequentially detecting the registration marks when forming a latent image corresponding to the recorded image; and a detection means for sequentially detecting the registration marks when the latent image corresponding to the recorded image is formed; and timing control means for adjusting the recording position of each color recorded image in the conveying direction of the recording medium by changing the recording period in response to a change in the measured value of the measuring means. A color image recording device characterized by: