JP2005091860A - Proof forming method and image recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a proof forming method and an image forming device that form a proof through which print deviation of printed matter to be proofed is confirmed. <P>SOLUTION: In this proof forming method, an image of past printed matter of a printer which prints printed matter to be proofed is read and data on print deviation is obtained from the read image; and an image recording device which forms the proof through exposure carries out the exposure by shifting a start position of exposure in a vertical scanning direction and a horizontal scanning direction to form the proof. Consequently, the proof through which the print deviation of the printed matter to be proofed is reproduced and confirmed, is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a proof creation method for creating a proof of a printed matter of a printing press, and an image recording apparatus capable of creating a proof by exposing each color of C, M, Y, and K at one time or by performing surface sequential exposure. Is.

  Conventionally, a proof (proof) is separately prepared for proofing a color printed matter, and the finished product is confirmed in advance before producing a production printing plate. For this reason, multi-valued image data is halftoned by a front system such as a halftone dot image data generation device to generate binary image data, and based on this halftone dot image data, the image recording device uses a plurality of light sources having different wavelengths to produce silver. A salt color light-sensitive material is exposed to create a proof (proof material). Further, the image information of each color of YMC or YMCK is obtained, and a plurality of donor sheets having different ink colors are overlapped so that the surface having the ink layer and the surface having the image receiving layer of the image receiving sheet face each other. An image recording apparatus that irradiates a light beam according to information and performs surface sequential exposure so that an ink layer is melted and transferred to an image receiving sheet by image information composed of several μm dots formed on a donor sheet. Create a proof with.

However, the proof created by each of the conventional image recording apparatuses cannot reproduce the printing misalignment of the printing machine that performs the actual printing. Each printing machine has its own mechanical and physical characteristics.Therefore, if there is a print misalignment in the printed material printed by the printing machine that performs this printing, the proof and the printed material to be calibrated will differ. The printing misalignment of the printed material could not be confirmed.
JP 9-272230 A

  An object of the present invention is to provide a proof creation method and an image forming apparatus capable of creating a proof capable of confirming a printing misalignment of a printed material to be calibrated in view of the above-described problems of the prior art.

  In order to achieve the above object, a proof creation method according to the present invention includes a step of reading an image of a past printed matter of a printing press that prints a printed matter to be calibrated, and a step of acquiring printing misalignment data from the read image. A step of changing exposure conditions based on the printing deviation data in an image recording apparatus that creates a proof by exposure, and a step of creating a proof by performing exposure under the changed exposure conditions in the image recording apparatus; It is characterized by including.

  According to this proof creation method, the exposure condition is changed based on print misalignment data acquired from a printing machine that prints the calibration target print, and exposure is performed to create a proof. Proof that can be reproduced and confirmed.

  In the proof creation method, the exposure condition can be changed by shifting the exposure start position in the image recording apparatus.

  The image recording apparatus may be an image recording apparatus that performs surface sequential exposure for each of the C, M, Y, and K color plate image data, or the C, M, Y, and K color plate image data. Based on this, it is preferable that the image recording apparatus be exposed almost simultaneously by a plurality of light sources.

  The first image recording apparatus according to the present invention creates a proof that reproduces printing misalignment of a printing machine that performs main printing in an image recording apparatus that performs surface sequential exposure for each image data of C, M, Y, and K color plates. The exposure control is performed so as to shift the exposure start position.

  According to the first image recording apparatus, it is possible to reproduce the printing misalignment of the printing machine that performs the main printing by shifting the exposure start position. Therefore, it is possible to create a proof that can confirm the misprinting of the printed material to be calibrated.

  In the first image recording apparatus, when main scanning and sub-scanning are performed for the exposure, parameters relating to at least one of the main scanning direction and the sub-scanning direction can be set in order to shift the exposure start position. It is preferable.

  The second image recording apparatus according to the present invention reproduces the printing misalignment of the printing machine that performs the main printing in the image recording apparatus that is exposed almost simultaneously by a plurality of light sources based on the image data of each color plate of C, M, Y, and K In order to create a proof, exposure control is performed so as to shift the exposure start position.

  According to the second image recording apparatus, it is possible to reproduce the printing misalignment of the printing machine that performs the main printing by shifting the exposure start position. Therefore, it is possible to create a proof that can confirm the misprinting of the printed material to be calibrated.

  In the second image recording apparatus, when main scanning and sub-scanning are performed for the exposure, a parameter related to at least one of the main scanning direction and the sub-scanning direction can be set to shift the exposure start position. It is preferable.

  In this case, when the mixed color (K) is made up of C, M, and Y, exposure control is performed so that the color of the mixed color (K) does not change even if one color of C, M, and Y is shifted. .

  In each of the image recording apparatuses, when the exposure start position is shifted in the sub-scanning direction, the position of the exposure unit or the light source unit can be shifted by a motor with respect to the initial position of the exposure unit or the light source unit.

  Further, when the exposure start position is shifted in the main scanning direction by less than 1 dot, it can be configured to shift the reference pixel clock signal through a delay circuit. In this case, the delay time of the delay circuit can be set.

  Further, when the C, M, and Y colors are shifted by less than 1 dot in the main scanning direction, the exposure start position is shifted by providing a delay circuit with respect to the reference pixel clock that enters each color. In addition, when the mixed color (K) is made of C, M, and Y, a reference for entering each color in order to prevent the mixed color (K) from changing even if one color of C, M, and Y is shifted. The pixel clock is not passed through the delay circuit.

  According to the proof creation method and the image forming apparatus of the present invention, it is possible to create a proof capable of reproducing and confirming a printing deviation of a printed material to be calibrated. As described above, since the printing misalignment of the printing machine that performs the main printing can be reproduced, it is possible to reduce the man-hours for checking the printed matter and the printing man-hours for the unnecessary printed matter.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a proof creation system according to the present embodiment.

  The proof creation system in FIG. 1 creates a color proof (calibration sample) for confirming a pattern, color tone, text, character, etc. to be printed when printing at a printing factory or the like. The processing device 2 receives multivalued image data such as PS (PostScript) data from a client terminal of a printing factory, performs raster image conversion processing based on the multivalued image data, and converts binary halftone image data and the like. The image recording apparatus 1 generates and outputs a color proof by exposure based on the halftone dot image data and the like.

  On the other hand, the image reading device 3 such as a scanner reads an image from the past printed matter of the printing machine that prints the proofreading printed matter, acquires the data of the printing deviation, and the printing deviation is detected at the time of exposure in the image recording apparatus 1. In order to reflect this, the exposure conditions are changed by shifting the exposure start position or the like to create a color proof.

  Next, as the image recording apparatus 1 in FIG. 1, an image recording apparatus 1A that exposes substantially simultaneously by a plurality of light sources based on image data of C, M, Y, and K color plates will be described with reference to FIGS. explain.

  FIG. 2 is a view of the inside of the image recording apparatus according to the present embodiment as viewed from the front side. FIG. 3 is a plan view of the main part of the drum and the optical unit of the image recording apparatus shown in FIG. 2 as viewed from above.

  As shown in FIG. 2, the image recording apparatus 1A according to this embodiment exposes a silver salt color photosensitive material (hereinafter also simply referred to as “photosensitive material” or “photosensitive paper”) in order to create a color proof. An exposure unit 11 that forms an image and a developing unit 21 that develops the exposed photosensitive material are provided.

  As shown in FIG. 2, the exposure unit 11 of the image recording apparatus 1 is loaded with loading units 12, 12 for loading and storing a dedicated cartridge 13 that houses photosensitive paper that is a sheet-like photosensitive material wound in a roll. ', A feeding unit 14 including a pair of conveying rollers 40, 41, and 42 for feeding the photosensitive paper from the cartridge 13 loaded in the loading unit 12, 12', and the photosensitive paper fed from the feeding unit 14. A drum 10 that rotates in the rotation direction R for main scanning while vacuum-sucking and holding S on the outer peripheral surface, an exposure unit 16 that exposes a photosensitive paper on the drum 10 with a light beam such as LED light, and an exposure unit A sub-scanning unit 17 that transports 16 in the sub-scanning direction (perpendicular to the plane of FIG. 1) H (FIG. 3) for sub-scanning; Is provided. The exposed photosensitive paper is conveyed to the developing unit 21 through the outlet 19 and the connecting portion 19a.

  The image recording apparatus 1 shown in FIG. 2 further includes a driven roller 31 that is arranged downstream of the conveying roller pair 42 and rotates following the photosensitive paper that is fed toward the drum 10, and the photosensitive paper between the drum 10 and the driven roller 31. The driven roller 31 to be conveyed, the accumulating guide member 18 for guiding the photosensitive paper when the photosensitive paper peeled off from the drum 10 by the peeling member 15 is conveyed by the drum 10 and the driven roller 31, and the accumulating guide member 18 A conveying roller pair 32 that further conveys the photosensitive paper that has been conveyed to the outlet 19 and an accumulator formed by opening a part of the accumulating guide member 18 to accumulate the photosensitive paper that has reached the conveying roller pair 32. The rate unit 30 and a detection sensor 33 that detects the leading edge of the photosensitive paper disposed in the vicinity of the downstream side of the conveyance roller pair 32 are provided.

  A relatively narrow driven roller 43 disposed in the vicinity of the downstream side of the conveying roller pair 42 is driven to rotate along with the movement of the recording paper, and a rotary encoder (not shown) is connected coaxially with the driven roller 43. . By rotating the rotary encoder together with the driven roller 43 and measuring the rotation amount, the length of the photosensitive paper wound around the rotary drum 10 through the pair of conveying rollers 42 can be obtained. The downstream conveying roller pair 32 has a one-way clutch structure and can freely rotate in the direction of feeding the photosensitive paper downstream.

  A cut portion 10a for cutting the photosensitive paper is disposed in the vicinity of the downstream side of the pair of conveyance rollers 40 and 41 in FIG. 2, and each cut portion 10a has a rotary cutter that is rotationally driven by a motor (not shown). The photosensitive paper is cut into a predetermined length based on the above-described measurement of the length of the photosensitive paper.

  The developing unit 21 in FIG. 2 performs wet development on the exposed photosensitive paper sent from the exposure unit 11, and includes a developing unit 23 that performs development processing of the photosensitive paper, a fixing unit 24 that performs fixing processing, and a stable unit. A stabilization unit 25 that performs processing, a drying unit 26 that performs drying processing, and a discharge unit 27 that discharges the dried photosensitive paper to the outside by a pair of conveyance rollers 27a and the like.

  As shown in FIG. 3, in the drum 10 of the image recording apparatus 1, the rotation shaft 14a of the rotation shaft portion 14 ′ and the rotation shaft 15a of the rotation shaft portion 18a are rotatable to the support bases 34a and 34b via the bearings 33a and 33b. It is pivotally supported. One rotating shaft 15a of the drum 10 is provided with a driving pulley 35a, which is connected to an output pulley 35b of a drum driving pulse motor M6 by a belt 36 and driven by the drum driving pulse motor M6. 10 rotates. A rotary encoder 37 is provided on the rotation shaft 15 a of the drum 10, and a pulse signal for rotation is output and used for pixel clock control synchronized with the rotation of the drum 10.

  The other rotating shaft 14a of the drum 10 is connected to the suction blower P1. A large number of suction holes 31c are formed on the surface of the drum 10 so as to extend linearly in the direction of the rotation axis. The inside of the drum 10 is depressurized by driving the suction blower P1, and the photosensitive paper is sucked onto the surface of the drum 10. .

  The exposure unit 16 is configured to be movable in parallel with the drum axis by the sub-scanning unit 17, and writes an image by exposing the photosensitive paper adsorbed to the drum 10 with a light beam. As shown in FIG. 3, the exposure unit 16 includes an LED unit 320, an LED unit 321, and an LED unit 322 as light sources having different three wavelengths. Each LED unit 320, 321, 322 includes a light emitting diode (LED) disposed on a substrate for a plurality of channels, and the light beam from each LED unit 320, 321, 322 passes through mirrors 325, 326, 327. Thus, the image is exposed from the condenser lens 331 onto the photosensitive paper on the drum 10. The exposure shutter 332 is opened / closed by an exposure solenoid 333 to open / close the optical path at the start / end of exposure.

  The plurality of LED units 320, 321, and 322 are configured to emit light of, for example, B (blue) having a wavelength of about 450 nm, G (green) having a wavelength of about 540 nm, and R (red) having a wavelength of about 650 nm. When a silver salt color photosensitive material is exposed by each LED unit, Y (yellow) is developed by B, M (magenta) is produced by R, and C (cyan) is produced by G.

  The exposure unit 16 is fixed to the moving belt 340 and is guided by a pair of guide rails 341 and 342 so as to be movable in the sub-scanning direction H parallel to the drum axis and in the opposite direction H ′. The moving belt 340 is stretched over a pair of pulleys 343 and 344. One pulley 344 is connected to the output shaft 345 of the sub-scanning motor M7, and the exposure unit 16 is sub-scanned in parallel with the drum axis by driving the sub-scanning motor M7. Move in the direction H and in the opposite direction H ′.

  Further, as shown in FIG. 3, a photometric unit 57 composed of a light receiving element such as a photodiode is disposed at an extended position parallel to the drum axis of the outer peripheral surface of the rotary drum 10, and the position of the home position in FIG. The exposure unit 16 is slightly moved in the direction H ′ so that the light beams from the LED units 320 to 322 are incident on the photometry unit 57, whereby the light amount of the light beam of each LED of each channel can be measured.

  As shown in FIG. 3, the suction blower P1 sucks the inside of the drum 10 through the suction connecting pipe 51 'by an air suction pump, and negatively pressurizes the inside of the drum 10 before the exposure unit 11 starts the exposure, thereby adsorbing the photosensitive paper to the outer peripheral surface. To do.

  Next, as the image recording apparatus 1 in FIG. 1, an image recording apparatus 1B that performs surface sequential exposure for each of the C, M, Y, and K color plate image data will be described with reference to FIGS.

  FIG. 4 is a view of the inside of another image recording apparatus according to the present embodiment as viewed from the side. FIG. 5 is a perspective view showing a recording head of the exposure unit of the image recording apparatus of FIG.

  As illustrated in FIG. 4, the image recording apparatus 1 </ b> B includes a sheet supply unit 120, a platen 130, an exposure unit 140, a sheet discharge unit 150, and a control unit 160. A platen 130 is disposed at the center of the apparatus main body 1b, a sheet supply unit 120 is disposed on one side of the platen 130, and an exposure unit 140 is disposed on the other side. The sheet discharge unit 150 is disposed on the upper part of the apparatus main body 1 b, the platen 130 and the exposure unit 140 are mounted on the support base 190, and the control unit 160 is disposed inside the support base 190.

  In the sheet supply unit 120, an image receiving sheet supply unit 200 and a donor sheet supply unit 210 are arranged. The image receiving sheet supply unit 200 is loaded with the image receiving sheet 100 in which a roll-shaped ink image receiving layer is provided on one side of the support, the feeding roller 220 is driven by the feeding motor M1, and the feeding roller 220 receives the image. The sheet 100 is fed in the direction of the platen 130. A cutter 240 is disposed in the image receiving sheet conveyance path 230 and cuts the image receiving sheet 100 into a predetermined length.

  The donor sheet supply unit 210 is provided with a rotating rack 250 that is rotatable about a support shaft 250a. The rotating rack 250 is loaded with a plurality of roll-shaped donor sheets 101. This roll-shaped donor sheet 101 is configured by providing an ink layer on one side of a support, and in this embodiment, the ink color of the ink layer is different from yellow Y, magenta M, cyan C, black K, and color correction. Correction SP1, SP2, etc. used in the above are used. The rotating rack 250 is provided with a feeding roller 260 corresponding to the position of the roll-shaped donor sheet 101, and the rotating rack 250 rotates to stop the donor sheet 101 at a predetermined feeding position.

  The donor sheet 101 sequentially sent out at this feeding position is driven by the feeding roller 270 by the feeding motor M2, and the feeding roller 270 feeds the donor sheet 101 toward the platen 130. A cutter 290 is disposed in the donor sheet conveyance path 280, and the donor sheet 101 is cut into a predetermined length.

  In the sheet supply unit 120, after supplying the image receiving sheet 100 having the ink image receiving layer provided on one side of the support to the platen 130, a plurality of donor sheets having different ink colors provided with the ink layer provided on the one side of the support. 101 is fed to the platen 130 one by one.

  The platen 130 is rotatably provided, and holds the image receiving sheet 100 supplied from the image receiving sheet supply unit 200 of the sheet supply unit 120 so that the surface having the ink image receiving layer faces the front side, and then the platen 130 of the sheet supply unit 120. The donor sheets 101 supplied from the donor sheet supply unit 210 are held one by one so that the surface having the ink layer and the surface having the image receiving layer of the image receiving sheet 100 face each other.

  The platen 130 includes a drum 300 that can rotate around a rotation axis 300a. The donor sheet 101 is sequentially superimposed on the image receiving sheet 100 on the drum 300, and the drum 300 is rotated in the rotation direction (main scanning direction) R in the overlapped state. By irradiating the light beam from the exposure unit 140 for each color while rotating, a highly accurate image output can be obtained with a compact structure.

  The exposure unit 140 includes a recording head 400, and the recording head 400 is movable in the sub-scanning direction in parallel with the rotation shaft 300a of the drum 300 by a motor (not shown). The recording head 400 performs surface-sequential exposure by irradiating the donor sheet 101 on the platen 130 with a light beam based on the input image data of each color plate.

  In the sheet discharge unit 150, a donor sheet discharge unit 500 and an image receiving sheet discharge unit 510 are arranged. The discharge roller 520 is driven by the discharge motor M <b> 3, and the donor sheet 101 and the image receiving sheet 100 peeled by the peeling member 530 are discharged by the discharge roller 520. The donor sheet 101 irradiated with the light beam is discharged to the donor sheet discharge unit 500, and the image receiving sheet 100 to which the ink from the donor sheet 101 is transferred is discharged to the image receiving sheet discharge unit 510.

  As described above, the image recording apparatus 1B sequentially superimposes the donor sheet 101 on the image receiving sheet 100, and irradiates a light beam for each of the C, M, Y, and K color plate image data. As a result, the ink from the donor sheet 101 is transferred to the image receiving sheet 100, and the donor sheet 101 irradiated with the light beam is discharged from the platen 130, so that surface sequential exposure can be performed and an image can be formed on the image receiving sheet 100.

  Next, the exposure unit 140 in FIG. 4 will be described. As shown in FIG. 5, the recording head 400 of the exposure unit 140 includes a plurality of light emitting units 410 for generating RGB light. Each light emitting unit 410 is configured by a laser diode, and the irradiated light beam is converted into a parallel light beam by the collimator lens 420 and is reduced by the first reduction optical system 430 to obtain an intermediate image 440. The recording head 400 includes a zoom adjustment mechanism 470 and a focus adjustment mechanism 480, and a final image 460 is emitted from the intermediate image 440 through the zoom lens 450 toward the drum 300.

  The zoom adjustment mechanism 470 operates the zoom adjustment member 470a by the zoom motor M10, whereby the zoom lens 450 moves in the optical axis direction, and is arbitrarily long within the range of the longest focal length to the shortest focal length of the zoom lens to be used. Zoom adjustment is performed by zooming to change the focal length in any direction.

  Further, the focus adjustment mechanism 480 operates a focus adjustment member 480a constituted by a feed screw or the like by the focus adjustment motor M11, whereby the lens unit 480b is moved in the optical axis direction to perform focus adjustment, and by light beam irradiation. Exposure can be performed at the in-focus position.

  Next, in the image recording apparatus 1A of FIGS. 2 and 3 and the image recording apparatus 1B of FIGS. 3 and 4, the exposure start position is shifted in order to reproduce the printing misalignment of the printing machine that performs the main printing at the time of proof creation. A configuration for performing exposure control will be described.

  First, when the exposure start position is shifted in the sub-scanning direction, the positions of the exposure unit and the light source unit are shifted by the motor with respect to the initial positions of the exposure unit and the light source unit. That is, the exposure unit 16 in FIG. 2 shifts the position of the optical axis p of the condenser lens 331 from which the light beams from the LED units 320, 321, and 322 are emitted from the initial position with respect to the drum 10 at the start of exposure. Then, it is moved by the sub-scanning motor M7. Similarly, the recording head 400 of FIG. 5 of the exposure unit 140 of FIG. 4 is moved by a motor so that the position of the optical axis p ′ of the zoom lens 450 is shifted from its initial position with respect to the drum 300 at the start of exposure. Is done.

  The amount of deviation of the above-described exposure start position in the sub-scanning direction can be determined based on printing deviation data obtained by reading an image of a printed matter with the image reading device 3 of FIG.

  Next, a configuration in which the exposure start position is shifted by less than 1 dot in the main scanning direction will be described with reference to FIG. FIG. 6 is a block diagram showing a circuit configuration for shifting the exposure start position in the main scanning direction by less than 1 dot in the image recording apparatus of FIG. 2 or FIG.

  As shown in FIG. 6, a pixel clock signal is generated by a PLL (Phase Locked Loop) circuit 81 based on information from an encoder 37 connected to the rotating shaft 15 a of the drum 10 of FIG. This pixel clock signal is passed through the delay circuit 82, so that the reference pixel clock signal can be shifted and delayed. By controlling the rotation of the drum 10 in the rotation direction (main scanning direction) R with the delayed pixel clock signal, the exposure start position can be shifted in the main scanning direction by less than 1 dot.

  In the case of FIG. 4 as well, the exposure start position is similarly shifted by less than 1 dot in the main scanning direction by the configuration of FIG. 6 based on information from an encoder (not shown) connected to the rotating shaft 300a of the drum 300. be able to.

  In FIG. 6, the amount of deviation of the exposure start position in the main scanning direction is the delay time of the delay circuit 82 based on print deviation data obtained by reading the image of the printed matter with the image reading device 3 of FIG. It can be adjusted by setting.

  The operation of the color proof creation system in which the image recording apparatus 1A or 1B of FIG. 2, FIG. 3, FIG. 4, or FIG. 5 is applied to the image recording apparatus of FIG. 1 will be described with reference to the flowchart of FIG.

  First, the image reading device 3 reads the image from the past printed material of the printing press that prints the printed material to be calibrated (S01), and the printing deviation data is acquired from the read image data (S02).

  Next, when the above-described print misalignment simulation is performed and the print misalignment is reproduced by color proof (S03), the exposure start position is set by the sub-scanning motor M7 in FIG. 4 based on the acquired print misalignment data. The exposure position is shifted in the scanning direction (S04), and the exposure start position is shifted in the main scanning direction by the circuit of FIG. 6 (S05), and then exposure is performed by each of the exposure units 16 and 140 (S06).

  As described above, the color proof creation system shown in FIG. 1 can create a color proof that can reproduce and check the printing deviation of the printed material to be calibrated, and can reproduce and check the printing deviation of the printing machine that performs the printing. It is possible to reduce the man-hours for checking printed materials and printing man-hours for unnecessary printed materials.

  In particular, each printing machine has its own mechanical and physical characteristics, and printing misalignment due to its unique mechanical and physical characteristics could not be reproduced by color proofing. However, since the printing deviation of the printed material to be calibrated can be reproduced by the color proof that can be obtained in the present embodiment, the printing deviation of the printed material can be confirmed.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, the circuit configuration of FIG. 6 can be configured as shown in FIGS.

  A configuration in which the exposure start position is shifted in the main scanning direction by shifting the C, M, and Y colors by less than 1 dot will be described with reference to FIG. FIG. 7 is a block diagram showing a circuit configuration for shifting the C, M, and Y colors in the main scanning direction by less than 1 dot in the exposure scanning position in the image recording apparatus of FIG. 2 or FIG.

  As shown in FIG. 7, the reference pixel clock signal from the PLL circuit 81 and the like in FIG. 6 is distributed to each color of B, G, and R by the distribution circuit 83, and the reference pixel clock distributed to each color is the delay circuit for each color. By passing through 84, 85, 86, the reference pixel clock signal can be shifted and delayed. By controlling the rotation of the drum 10 in the rotation direction (main scanning direction) R for each color of B, G, and R with this delayed pixel clock signal, the exposure start position is less than 1 dot in the main scanning direction with B, G , R can be shifted for each color.

Also in the case of FIG. 4, the exposure start position is similarly set to less than 1 dot in the main scanning direction by the configuration of FIG. 6 based on information from an encoder (not shown) connected to the rotating shaft 300a of the drum 300. , G, and R can be shifted for each color.
In FIG. 7, the amount of deviation of the above-described exposure start position in the main scanning direction is determined by the delay circuits 84 and 85 based on printing deviation data obtained by reading the image of the printed matter with the image reading device 3 of FIG. , 86 can be adjusted by setting respective delay times.

  Next, referring to FIG. 8, when the mixed color (K) is made of C, M, and Y, the mixed color (C, M, and Y) can be mixed even if the start position of exposure for one color is shifted in the main scanning direction. A configuration for preventing the color of K) from changing will be described.

  FIG. 8 is a diagram for preventing the mixed color (K) from changing even if the start position of exposure of one color of C, M, and Y is shifted in the main scanning direction in the image recording apparatus of FIG. 2 or FIG. It is a block diagram which shows a circuit structure.

  As shown in FIG. 8, when the K color signal is input to the delay circuits 84, 85, 86 for each color, the circuit of FIG. 7 is configured such that the delay time settings of the delay circuits 84 to 86 for each color become zero. . As a result, the clock signals output from the delay circuits 84 to 86 for the respective colors remain the reference pixel clock signals.

  As described above, even when each color of C, M, and Y is shifted by less than 1 dot in the main scanning direction, when making a mixed color (K) with C, M, and Y, the reference of entering each color in FIG. By preventing the pixel clock signal from being delayed by the delay circuits 84 to 86 (not passing through the delay circuits 84 to 86), the mixed color (K) can be prevented from being shifted, and the color of the mixed color (K) does not change. .

  In FIG. 9, the exposure start position is shifted in the sub-scanning direction and the main scanning direction. However, the exposure start position may be shifted in either direction based on the acquired print misalignment data.

It is a figure which shows schematic structure of the proof production system by this Embodiment. It is the figure which looked at the inside of the image recording device by this Embodiment from the front side. FIG. 3 is a plan view of a main part when the drum and the optical unit of the image recording apparatus of FIG. 2 are viewed from above. It is the figure which looked at the inside of another image recording device by this Embodiment from the side. FIG. 5 is a perspective view showing a recording head of an exposure unit of the image recording apparatus in FIG. 4. FIG. 5 is a block diagram showing a circuit configuration for shifting the exposure start position in the main scanning direction by less than 1 dot in the image recording apparatus of FIG. 2 or FIG. 4. FIG. 5 is a block diagram showing a circuit configuration in which the exposure start position is shifted in the main scanning direction by shifting the C, M, and Y colors by less than 1 dot in the image recording apparatus of FIG. 2 or FIG. 2 shows a circuit configuration for preventing the color of the mixed color (K) from changing even when the start position of exposure of one color of C, M, and Y is shifted in the main scanning direction in the image recording apparatus of FIG. 2 or FIG. It is a block diagram. It is a flowchart for demonstrating operation | movement of the color proof production system of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image recording device 1A Image recording device 1B Image recording device 1b Device main body 2 Image processing device 3 Image reading device 10 Drum 11 Exposure unit 16 Exposure unit 17 Sub-scanning unit 21 Development unit 37 Rotary encoder 82 Delay circuit 84, 85, 86 Each color Delay circuit 100 image receiving sheet 101 donor sheet 140 exposure unit 300 drum 400 recording head H sub-scanning direction M6 drum driving pulse motor M7 sub-scanning motor R rotating direction (main scanning direction)

Claims (8)

Reading an image of a past print of a printing press that prints the print to be calibrated;
Obtaining print misalignment data from the read image;
A step of changing exposure conditions based on the printing misalignment data in an image recording apparatus that creates a proof by exposure; and
And a step of creating a proof by performing exposure under the changed exposure condition in the image recording apparatus. The proof creation method according to claim 1, wherein an exposure start position in the image recording apparatus is shifted for changing the exposure condition. The image recording apparatus is an image recording apparatus that performs surface sequential exposure for each color data of C, M, Y, and K, or based on image data of each color of C, M, Y, and K 3. The proof creation method according to claim 1, wherein the image recording apparatus performs exposure substantially simultaneously with a plurality of light sources. Exposure control is performed so that the start position of exposure is shifted in order to create a proof that reproduces the printing misalignment of a printing press that performs main printing in an image recording apparatus that performs surface sequential exposure for each image data of each color plate of C, M, Y, and K. An image recording apparatus characterized in that: 5. The apparatus according to claim 4, wherein when performing main scanning and sub-scanning for the exposure, a parameter relating to at least one of a main scanning direction and a sub-scanning direction can be set in order to shift a start position of the exposure. The image recording apparatus described in 1. In order to create a proof that reproduces the printing misalignment of a printing machine that performs main printing in an image recording apparatus that performs exposure almost simultaneously with a plurality of light sources based on image data of each color plate of C, M, Y, and K, the exposure start position is set. An image recording apparatus that performs exposure control so as to shift. 7. The apparatus according to claim 6, wherein when performing main scanning and sub-scanning for the exposure, a parameter relating to at least one of a main scanning direction and a sub-scanning direction can be set in order to shift a start position of the exposure. The image recording apparatus described in 1. The exposure control is performed so that when the mixed color (K) is made of C, M, and Y, even if one color of C, M, and Y is shifted, the color of the mixed color (K) is not changed. 8. The image recording apparatus according to 6 or 7.

Images