JPH0732461B2 - Image reproduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) Image processing is performed on a plurality of input color component signals,
The present invention relates to an image reproducing apparatus that forms color component images on a plurality of recording media according to a plurality of color component signals after the image processing.

(Prior Art) Normally, registration of copying is performed by copying a test chart original as shown in FIG. 1 and adjusting the timing of starting the irradiation of the original with respect to the drum and the timing of feeding the transfer paper while observing the reproduced image. I'm going.

Similarly, the color balance adjustment for each color is performed by adjusting the voltage of the band electrode while observing the reproduced image. As an example, FIG. 2 shows a case where the R image shifts to the lower right and the R image density is high. However, if the document reading section and the image reproducing section are separated, it is difficult to perform the above adjustment, for example, when they are divided into different buildings.

(Object of the Invention) The present invention has been made in view of the above circumstances, and reads a reference color component image formed on a plurality of recording media and transferred onto a transfer member, and registers the plurality of color component images. The object is to reproduce a good color image without color misregistration by adjusting the color ratio.

(Embodiment) FIG. 3 shows an embodiment of the present invention, in which 1 is a document reading section and 2 is an image reproducing section. A start button 3 is used to scan a document and start transferring image data. Reference numeral 4 denotes an exposure lamp for illuminating an original, 5 denotes an original for copying the same with an image reproducing device, 6 denotes reflected light from the original for mirror A, mirror B,
An image is formed on the CCD through the mirror C, the lens 10 and the dichroic mirror. 7 is a mirror A which moves at the same speed as the exposure lamp, 8
Mirror B is mirror C of 9 and half of exposure lamp
Moving at the speed of 11, 11 is a dichroic mirror that separates white light into three colors of blue 12, green 14, and red 16, 1
3,15,17 are CCDs that change the intensity of light into the intensity of voltage for each pixel, and 18,19,20 are CCD amplifier circuits that amplify the output voltage of each pixel of the CCD and further perform A / D conversion. Close to 00 when the CCD incident light is large. 21,22,23 are each color of 8BiT parallel signal after A / D conversion, 24 is a clock signal for transferring an image signal by a clock signal, 30 is a selector, an image signal read by a CCD or a signal from a non-volatile memory Select either. A paper feed roller 34 feeds the transfer paper one by one from the transfer paper storage cassette 35. 37, 38, 39 are photosensitive drums, which are uniformly charged and whose electric charge is removed only where they are irradiated with laser light,
Reference numerals 40, 41, and 42 are scanner motors, which rotate polygon mirrors 43 to 45 for scanning the laser light. 46 to 48 are developing devices for developing the photosensitive drums respectively to visualize latent images in blue, green, and red. Turn into a statue. 52 is a fixing roller, and 53,5
4,55 is a corona that charges the drum, 56,57 and 58 are transfer coronas, and 59,60 and 61 are the sensor to detect the beginning of the transfer paper sent and start the reproduction image formation on the photosensitive drum. The standard of
62, 63, 64 are lasers that output laser light 68 to 70, 65, 66,
The reference numeral 67 is used as a reference for starting data writing to the photosensitive drum after a predetermined time has passed after the laser light is sensed by the BD sensor. An image signal processing circuit 71 corrects γ, dither for reproducing halftone, UCR, and the like. 72 is a laser driver circuit, which amplifies the power of the image signal and turns the laser on and off
To do. Reference numerals 73, 74, and 75 are non-volatile memories in which data for generating the same signal as that generated by the image reading device reading the test chart is stored in advance for each color.
A clock signal oscillator circuit 76 generates a clock signal 24 for transferring an image signal.

Next, in the above configuration, when the start switch 3 is pressed while the power switch (not shown) is turned on for the document reading unit 1 and the image reproducing unit 2, the exposure lamp 4 lights up and the mirror A7 and the mirror A7 start moving to the right. The light 6 emitted from the exposure lamp and reflected by the original 5 is reflected by the mirror A7, further reflected by the mirror B8, further reflected by the mirror C9, passed through the lens 10 and enters the dichroic mirror 11 to be color separated, and the blue light 12 is coupled to the CCD 13. Image. Further, the color-separated green light 14 forms an image on the CCD 15. The red light 16 that has been color-separated forms an image on the CCD 17. C
The CD outputs a voltage according to the amount of imaged light. The CCD amplifier circuit 18 amplifies the signal of the CCD 13 and further performs A / D conversion to transmit a blue image signal 21 to the image reproducing device 2. Similarly, the CCD amplifier circuit 19 amplifies the signal of the CCD 15 and further performs A / D conversion, and transmits the green image signal 22 to the image reproducing device 2. As well
The CCD amplifier circuit 20 amplifies the signal of the CCD 17 and further performs A / D conversion to transmit a red image signal 23 to the image reproducing device 2. The signal transfer from the CCD to the CCD amplifier circuit and the transmission of each color image signal from the CCD amplifier circuit to the image reproducing apparatus are performed in synchronization with the clock signal 24.

In the image reproducing apparatus, when the selector 30 selects the a side, the image signals 21, 22, 23 sent from the document reading section 1
Are stored in the memory B31, the memory G32, and the memory R33 in synchronization with the clock signal 24. At this time, the paper feed roller 34 and the photosensitive drum 3
7,38,39, scanner motors 40,41,42, polygon mirrors 43,44,45 directly connected thereto, developing unit B46, developing unit G47, developing unit
R48, conveyor belts 49, 50, 51 and fixing roller 52 start to rotate. Further, a high voltage DC voltage is applied to the strip electrodes 53, 54, 55 and the transfer electrodes 56, 57, 58.

The image data stored in the memory R33 is synchronized with the clock signal 24 in the image signal processing circuit 71 after a predetermined time has elapsed since the laser beam 68 was irradiated to the BD sensor 65 for the first time after the transfer paper 36 came to the sensor 59. Send it out.

The image signal processing circuit 71 performs well-known UCR, masking and other signal processing, then sends a signal to the ray driver circuit 72, power is amplified in the laser driver circuit 72 and the laser 62 is turned on or off to turn off the latent image by dots. An image is created on the photosensitive drum 37. The latent image is developed by the developing device 46, a red visible image is formed on the photosensitive drum 37, and a red image is formed on the transfer paper when the transfer paper 36 passes over the transfer pole.

Therefore, if the time from the irradiation of the laser beam 68 to the BD sensor 65 to the sending of the image data from the memory R33 is lengthened, the visible image created on the transfer paper 36 moves to the right of the transfer paper 36. If the sensor 59 for detecting the front end of the transfer paper 36 is not close to the transfer paper storage cassette 35, the visible image formed on the transfer paper 36 moves upward in the transfer paper 36.

Similarly, a green image is superposed on the transfer paper by the photosensitive drum 38, a blue image is superposed on the transfer paper by the photosensitive drum 39 in the same manner, and the image is fixed by the fixing roller 52, and then sent out of the apparatus to complete a color copy.

A case where the test document as shown in FIG. 1 is set in the image reading section and the start button 3 is pressed will be described. The blue image signal 21 is synchronized with the clock 24 and passed through the selector 30.
Memorized in order from address 0000. It is 00 that is stored until the image appears. The line of the image signal 21 is represented by one line, but a plurality of lines including density information, for example, 8B
iT line.

Enlarge the + part in the upper left of FIG. 1 to enlarge the memory B for each pixel.
The model stored in FIG. 4 is shown in FIG.

The test pattern reproduced on the transfer paper or the drum can be read by the photo sensor and stored in the memory to automatically correct the color registration and the color balance.

FIG. 5 is a correction flow programmed in the main body control unit (not shown). CCD of drum width size as a photo sensor
Is preferable, and the left and right deviations are + marks (2nd
It can be detected by the number and position determination in FIG. For example, when the R image is shifted to the right as shown in FIG. 2, the number of + marks becomes two, and the positional relationship between the two + marks is determined from the data stored in the memory. The correction amount can be obtained by. The vertical shift can be detected by determining the time difference between the timing signal synchronized with the drum rotation and the + mark sense signal. For example, when the image of R is shifted downward as shown in FIG. 2, the correction amount can be obtained depending on how much the detection time of each of the two + marks is relative to the timing signal. In addition, the amount of correction can be obtained by comparing the color and the sense level of the CCD with each other.

Explaining with reference to FIG. 5, the reproduction copy of FIG. 2 is YES in step 1a because only the red image is shifted to the lower right. Therefore, the clock signal (see 3) Figure 24) is counted a predetermined number, and when the count up is completed, the count set value of the left margin counter for starting to write an image in the left and right direction of the photosensitive drum by the laser is decreased (step 2).
a). If this adjustment eliminates the left / right deviation, proceed to 3a. Since it is not shifted up, proceed to NO. The sensor that determines the timing to start writing the image with the laser in the rotation direction of the photosensitive drum by detecting the leading edge of the transfer sheet by judging YES at 4a and YES in step 3 of FIG. Move closer to the cassette side by a certain distance and accelerate the timing. If the vertical displacement disappears, the NO image of 4a progresses to 5a, so the red image is dark, so YES, proceed to 11a and lower the voltage of the band electrode, blue,
If the green and red concentrations are the same, proceed to NO in 6a to complete. Even if blue or green is adjusted, the flow chart of FIG. 6 may be executed for that color.

Next, a circuit for generating the adjustment mark will be described.
The contents stored in the memory B31 when the original document shown in FIG. 1 is copied are as shown in FIG. 4, so that the same data can be stored in the memory B31, the memory G32, and the memory R33 even if the image reading unit 1 is removed. To do. That is, FF is stored in the non-volatile memory 73 at the position where the image is desired to be black, and the pattern as shown in FIG. 4 is stored. When the data selector 30 is switched to the b side and the clock is given from the clock generation circuit 76, the nonvolatile memory
73 to memory B31, non-volatile memory 74 to memory G32
Clock signal 2 from non-volatile memory 75 to memory R33
A pseudo image signal is sent in synchronism with 4, and an image can be created on the transfer paper in the same manner as in normal copying. The blue image is reproduced from the blue image signal, the green image is reproduced from the green image signal, and the red image is reproduced from the red image signal.

If the pseudo image signal is 00, the density of the reproduced image is minimum, and if it is FF, the density is maximum, but the value between 00 and FF is the image signal processing circuit.
By 71, halftones are reproduced by a dither circuit having a different desa pattern for each color.

The image reproducing unit 2 of this example reproduces an image by superimposing blue, green and red images by using three photosensitive drums, but it is also possible to use four photosensitive drums and add a block in addition to the above. It is possible. It is also possible to use one photosensitive drum, transfer blue to the transfer paper, and then clean it, then form a green image and then clean it, and then form a reddish and transfer it. The present invention is another one.
It can also be applied to a pixel 4-dot output type color printer.

Further, by switching the data selector 30 during image reproduction, it is possible to create an image in which the image signal sent from the document reading device and the pseudo image signal from the non-volatile memory are combined. In addition, a non-volatile memory may be built in the image reading apparatus for the purpose of merely adjusting without using the test chart.

As described above, it is not necessary to place a test document for adjustment, and it becomes easy to adjust the reproduction image density balance depending on the timing of writing an image in the image reproduction apparatus or between the drums.

(Effects of the Invention) As described above, according to the present invention, a reference color component image formed on a plurality of recording media or a reference color component image transferred on a transfer body is read to obtain a plurality of color component images. A good color image can be reproduced by adjusting the registration of.

That is, according to the present invention, since the recording medium corresponding to a plurality of color components has the reference signal generating means, it is possible to form the reference image at an independent timing for each color component, and further, the plurality of color components can be formed. Since the reference image is transferred onto the transfer body and then the displacement is read on the transfer body, it is extremely easy to determine which color component is displaced from the other color component and to what extent.

[Brief description of drawings]

1 and 2 are a test chart, FIG. 3 is a block diagram of an image reproducing system to which the present invention can be applied, FIG. 4 is a memory map, and FIG. 5 is a modified flow chart. 31 to 33 …… B, G, R memories 73 to 75 …… Indicates non-volatile memory.

Claims (1)

[Claims] 1. Image processing is performed on a plurality of input color component signals, color component images are respectively formed on a plurality of recording media according to the plurality of color component signals after the image processing, and the images are transferred. In an image reproducing apparatus for reproducing a color image by superposing a plurality of color component images on a body, an input unit for inputting the plurality of color component signals, and a plurality of references respectively corresponding to the plurality of recording media. A plurality of signal generating means for independently generating color component signals, a first mode for outputting a plurality of color component signals from the input means, and a plurality of reference color components from the plurality of signal generating means Selecting means for selecting a second mode for outputting a signal; and a plurality of colors from the input means respectively corresponding to the plurality of recording media when the first mode is selected by the selecting means. In response to component signals Then, each independently forms a color component image on the plurality of recording media, and when the second mode is selected, the color component images from the plurality of signal generating means respectively corresponding to the plurality of recording media are formed. A plurality of image forming means for independently forming reference color component images on the plurality of recording media in response to a plurality of reference color component signals; and the plurality of recording media in the first mode. Of the plurality of color components formed on the recording medium by the image forming unit in the second mode so as to adjust the registration of the plurality of color component images formed by the transfer member. It is characterized in that the reference color component image is read, the positional deviation of the reference color component image is converted into an electric signal, and the registration of the color component image corresponding to each of the plurality of recording media is adjusted according to the electric signal. Tosu Image reproduction device.