JPS59163969A - Image reproducing system - Google Patents

Abstract

PURPOSE:To simplify the adjustment of resist matching and color balance by providing a generating circuit for a signal the same as that on an original at an image reproducing side. CONSTITUTION:A reflected light as the result of irradiation of an original 5 is separated into three colors B, G, R at an original reading section 1 and the image of the colors is formed respectively on CCDs 13, 15 and 17. Each CCD converts the strength of the light signal into the strength of a voltage and amplifies it, the signal is A/D-converted and inputted to an image reproducing section 2. The color separation signals B, G, R inputted to the reproducing section 2 are stored respectively to memories 31-33 via a selector 30. Each color signal of the memories 31-33 is subjected to prescribed processing at an image processing circuit 71, a laser light is irradiated on a sheet of transfer paper on photosensitive drums 37-39 via a laser driver circuit 72 to form latent image. A color signal the same as signal obtained by reading a test chart at a reading section is stored in nonvolatile memories 73-75, this signal is stored to the memories 31-33 via a selector 30, and an image is formed on the transfer paper so as to attain ease of resist matching or the like.

Description

[Detailed description of the invention] The present invention relates to an image reproduction system.

Normally, copy registration is done by copying a test yard original as shown in Figure 1, and adjusting the timing to start irradiating the original light onto the drum and the timing to feed the transfer paper while looking at the reproduced image. There is.

Color balance adjustment for each color is similarly performed by adjusting the voltage of the charging electrode while viewing the reproduced image. As an example, in FIG. 2, a simple image is shifted to the lower right corner and the density of the simple image is high. However, if the large number of manuscripts to be read and the image reproduction unit are located far apart, for example in different buildings, the above adjustment is difficult.

The present invention solves the above-mentioned drawbacks by providing a circuit for generating the same signal as the original on the image reproduction side, for example, and creating an image using the signal, and making it easy to adjust the registration and color balance while viewing the image. It is something.

FIG. 3 shows an embodiment of the present invention, in which numeral 1 indicates a large number of manuscripts to be read, and numeral 2 indicates an image reproduction section. 3 is a start button, which is used to start scanning the original and transferring image data. Reference numeral 4 irradiates the original with an exposure rung, and 5 indicates the original, which is copied and imaged by an image reproducing device. 7 is a Mi 7-A that moves at the same speed as the exposure rung, 8 is a mirror B that pairs with mirror C of 9 and moves at a speed of % of the exposure lamp, 11 is a dichroic mirror that converts white light into blue 12 and green. It is separated into three colors: 14 and red 16. 13° 15. 17 is a COD that changes the intensity of light to the intensity of voltage for each pixel. 18. j9,20
A CCD amplifier circuit amplifies the output voltage of each pixel of the COD and further performs Aρ conversion O. When the incident light of COD is large, it approaches t-i.

21, 22, and 25 are 8-BiT parallel signals for each color after Aμ conversion, 24 is a clock signal for transferring the image signal, and 30 is a selector for color separation signals B, G, and R.
are the signals to memo+731, 32, and 33 respectively,
Select either the image signal read by COD or the signal from non-volatile memory. Reference numeral 34 denotes a paper feed roller that feeds the transfer paper one by one from the transfer paper storage cassette 35.

37, 38, and 35i are photosensitive drums that are uniformly charged and whose charges are removed only in the areas irradiated with laser light; 40, 41, and 42;
A scanner motor rotates polygon mirrors 43 to 45 for scanning with laser light, and developing units 46 to 4B develop the photosensitive drums to convert the latent images into visible images of blue, green, and red. 52 is the fixation four-ra,
55, 54, 55 are coronas that charge the drum, 54.5
7.58 is a transfer corona, and 59 and 60.61 are paper sensors that detect the leading edge of the transferred transfer paper and use this as a reference for starting formation of a reproduced image on the photosensitive drum. 62, 63° 64 is a laser that outputs laser beams 68 to 70, 65° 66, 6
7 is a reference for starting data writing to the photosensitive drum after a certain period of time after sensing the laser beam with the BD sensor. Reference numeral 71 denotes an image signal processing circuit that performs γ correction, dither for halftone reproduction, UCR correction, and the like. 72 is a laser driver circuit that amplifies the power of the image signal and turns on the laser.
, turns off. Non-volatile memories 73, 74, and 75 store in advance data for each color to generate the same signals that are generated when the image reading device reads the test f and yardage. 76 is a clock signal oscillation circuit that generates the clock signal 24 for transferring the image signal.

Next, in the above configuration, when the start key 3 is pressed while the power switch (not shown) is turned on for the multiple document reading unit 1 and the image reproduction unit 2, the exposure rung 4 lights up and moves to the right together with the mirror A7. Original 5 from exposure rung to start
The light 6 reflected by the mirror A7 is further reflected by the mirror B.
The blue light 12 is reflected by the mirror 8, further reflected by the mirror C9, and then passes through the lens 10 and enters the dichromatic mirror 11.
is imaged on the CCD 13. Further, the color-separated green light 14 is imaged on a CCD 15. Further, the color-separated red light 16 forms an image on a CCD 17. The COD outputs a voltage depending on the amount of imaged light. COD amplifier circuit 1B is C
The signal of the GD 15 is amplified and further subjected to Aρ conversion, and a blue image signal 21 is transmitted to the image reproduction device 2. Similarly, CO
The D amplifier circuit 19 amplifies the signal of the CCD 15 and further A
/D conversion is performed and the green image signal 22 is sent to the image reproducing device 2.
Send to. Similarly, the COD amplifier circuit 20 is CGD 17
The red image signal 23 is amplified and further subjected to A/D conversion, and is transmitted to the image reproducing device 2. CC from the above CCD
The transfer of the signal to the D amplifier circuit and the transmission of each color image signal from the CCD amplifier circuit to the image reproducing device are performed in synchronization with the four-way signal 24.

In the image reproducing device, when the selector '50 selects side a, the image signal 21 sent from the large number of originals read 1
,22.2! l is synchronized with the clock signal 24 and the memory B6
1, stored in memory G52 and memory R53. At this time, paper feed row 254, photosensitive drums 37, 38, 39, scanner motors 40, 41, 42, polygon mirrors 43, 44, 45 directly connected thereto, developer B46, developer G47,
The developing device R48, the conveyor belts 49, 50, 51, and the fixing roller 52 start rotating. Furthermore, charged electrodes 53, 54, 55
, a high voltage DC voltage is applied to the transfer poles 56, 57, and 5B.

After a certain period of time after the transfer paper 36 reaches the sensor 59 and the BD sensor 65 is irradiated with the laser beam 68, the image data stored in the memory R53 is sent to the image signal processing circuit 71 in synchronization with the clock signal 24. and send it out.

The image signal processing circuit 71 performs known signal processing such as UCR and masking, and then sends the signal to the laser driver circuit 72.The laser driver circuit 72 amplifies the power, turns the laser 62 on and off, and generates a dot. A latent image is created on the photosensitive drum 37. The latent image is developed by the developer 46 to create a red visible image on the photosensitive drum 67, and when the transfer paper 36 passes over the transfer pole, a red image is created on the transfer paper.

Therefore, if the time from when the laser beam 68 is irradiated to the BD sensor 65 to when the image data is sent from the memory R35 is increased, the visible image created on the transfer paper 36 will be
6 to the right and bring the sensor 59 that detects the leading edge of the transfer paper 36 closer to the transfer paper storage cassette 55, the visible image created on the transfer paper 36 will be in the upper direction of the transfer paper 66. Move to.

Similarly, a green image is superimposed on the transfer paper using the photosensitive drum 66,
Similarly, a blue image is superimposed on the transfer paper using the photosensitive drum 67, and after being fixed using the fixing roller 52, the image is sent out of the machine to complete a color copy.

When a test document as shown in Fig. 1 is set in the image reading section and the start button 3 is pressed, the image is stored sequentially from the ``:FFR:'' address through the synchronous selector 30 until the image appears. In is shown as a single line, but it is a plurality of lines, for example, 8 BiT, containing density information.

Expand the upper left corner of Figure 1 and store it in memory B for each pixel.
The model stored in is shown in Figure 4.

The test pattern reproduced on the transfer paper or drum is read by a photosensor and stored in a memory to automatically correct color registration and color balance.

FIG. 5 shows a correction flow programmed into the main body control section (not shown). As a photo sensor, CO is the size of a drum.
D is preferable, and the left and right deviations are corrected by determining the number and position of + marks by the CCD, and the vertical deviations are corrected by determining the time and interval difference between the timing signal synchronized with drum rotation and the + mark sense signal. The correction amount can also be determined by comparing the strength of the sense level with the COD.

To explain with reference to Figure 5, in the reproduced copy of Figure 2, only the red image is shifted to the lower right, so step 1a
If the answer is YES, therefore, the clock signal (Figure 3, 24) is counted a predetermined number from the time when the laser light is irradiated on the well-known BD sensor, and when the count-up is completed, the image is started to be written by the laser in the left and right direction of the photosensitive drum. The count setting value of the left margin counter is decreased (step ia). If this adjustment eliminates the gap between the left and right sides, proceed to 3a. is not on top, so go to No. 4a determines that it has shifted downwards, and then selects YES. By detecting the leading edge of the transfer paper, the sensor determines the timing at which the laser starts writing the image in the rotational direction of the photosensitive drum (Fig. 3, 61).
) to the cassette side by a predetermined distance to speed up the timing. If there is no vertical deviation, change from 4a NO to 5a
Proceed to , the red image is dark, so proceed to IL& with YBEI, lower the voltage of the charging electrode, and if the density of blue, green, and red become the same, N of 6a.

Proceed to complete the process. If you want to adjust blue or green, just execute the flowchart in FIG. 6 for that color. .

Next, a circuit for generating adjustment marks will be explained.

When a manuscript like the one shown in Figure 1 is copied, the self-answers stored in the memory B31 will be as shown in Figure 5, so il! II Image reading unit 1 also stores the same data in memory B31 and memory G5.
2. Make it possible to store it in the memory R33. That is, 7F is stored in the nonvolatile memory 73 at a place where the image is to be made black, and a pattern as shown in FIG. 5 is stored. Data selector'5
When 0 is switched to b@ and a clock is applied from the clock generation circuit 76, the non-volatile memory 73 to memory B31, the non-volatile memory 74 to memory G32, and the non-volatile memory 75 to memory R33 are synchronized with the clock signal 24. Then, a pseudo image signal is sent, and an image can then be created on the transfer paper in the same way as in normal copying. Note that the blue image is generated from the blue image signal, the green image is generated from the green image signal,
Assume that a red image is reproduced from a red image signal.

00 Also, if the pseudo image signal is t, the density O of the reproduced image is the minimum, and if it is F'F, it is the maximum. A neutral tone is reproduced.

The image reproduction section 2 in this example uses three photosensitive drums to reproduce images by overlapping blue, green, and red images, but it is also possible to use four photosensitive drums and add black in addition to the above. It is possible. It is also possible to use one photosensitive drum, transfer blue to a transfer paper and then clean it, then form a green image, clean it after transfer, and then form red and transfer it.

The present invention can also be applied to other 1-pixel, 4-dot output type color printers.

Furthermore, by switching the data selector 30 during image reproduction, it is also possible to create an image by combining the image signal sent from the document reading device and the pseudo image signal from the nonvolatile memory. Furthermore, if the purpose is simply to make adjustments without using a test chart, a non-volatile memory may be built into the image reading device. .

This eliminates the need to place a test original and make adjustments as in υ, making it easier to adjust the timing of writing out the image of the image reproducing device or the reproduced image density)<lance depending on the drum spacing.

[Brief explanation of drawings]

1 and 2 are test charts, FIG. 3 is a block diagram of an image reproduction system to which the present invention can be applied, FIG. 4 is a memory map, and FIG. 5 is a correction flowchart. 31 to 33 in the figure...B, G, R memories 73 to 75...-Nonvolatile memory V! Show me. Applicant: Canon Co., Ltd. Yamigo9

Claims (2)

[Claims] (1) An image reproduction system characterized by having a circuit that generates at least one reference signal for registration adjustment and color balance adjustment. (2) An image reproduction system comprising means for selecting one of the reference signals in paragraph 1.