Inkjet printing apparatus

Abstract

The invention provides an inkjet printing apparatus. An inkjet printing apparatus (1) includes: an image forming unit (31) that forms an image by an image of a drawing pattern formed on an object to be drawn with ink and generates an imaged image; an inspection machine (3) that performs image inspection on the drawing pattern using the imaged image; a storage unit (41) that stores region information indicating a region in which a drawing pattern can be formed on the object to be drawn, the region information being determined on the basis of angle-of-view information defining the imaging field of view of the imaging unit (31); a detection sensor (9) for detecting the arrival of the object to be drawn; and a control unit (40) that determines the timing of emission of the imaging trigger on the basis of the region information, the position of the element, and the timing of detection by the detection sensor.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an inkjet printing apparatus. BACKGROUND

[0002] For example, a drop-on-demand (DOD) inkjet printing apparatus that ejects ink toward a packaging material such as paperboard to print characters thereon is known (see, for example, Japanese Patent Application Publication No. 2014-144574). Further, a technique is known in which a camera captures a pattern drawn by a DOD inkjet printing apparatus, and an operation such as positioning is performed using the captured image (see, for example, Japanese Patent Application Publication No. 2020-131141).

[0003] Further, it can be considered to capture a pattern drawn by an inkjet printing apparatus using a camera, and perform an inspection of the pattern or the like using the captured image. In this case, it is necessary to emit an imaging trigger at the optimum timing at which the drawn pattern enters the field of view of the camera, but in order to make the timing of emitting the imaging trigger optimum, it is necessary to actually perform test drawing on the drawn object, and then observe the test-drawn drawn object while adjusting the timing of the imaging trigger. This timing adjustment work is not only cumbersome and time-consuming, but also not easy if not a skilled person proficient in both the inkjet printing apparatus and the camera. SUMMARY

[0004] The present disclosure takes the above-described problems into consideration, and aims to make the timing adjustment of the imaging trigger easy.

[0005] To achieve the above-described object, one aspect of the present disclosure relates to an inkjet printing apparatus including: an ink accommodating portion that accommodates ink; an ejection portion that ejects the ink supplied from the ink accommodating portion toward a drawn object conveyed by a conveyance device; an imaging portion that images a drawn pattern formed on the drawn object by the ink ejected by the ejection portion, and generates an imaged image; an image inspection portion that performs image inspection of the drawn pattern using the imaged image generated by the imaging portion; a storage portion that stores region information of the drawn pattern indicating an imageable region on the drawn object, which is determined based on angle information that specifies an imaging field of view of the imaging portion; a display portion that displays a setting surface corresponding to a drawn region on the drawn object drawn by the ink ejected by the ejection portion; a setting portion that configures an element corresponding to the drawn pattern on the setting surface displayed by the display portion based on a user operation, and sets a drawing content; a detection sensor that detects arrival of the drawn object conveyed by the conveyance device; and a control portion that determines a timing of emitting an imaging trigger based on the region information stored in the storage portion, a position of the element configured on the setting surface by the setting portion, and a detection timing of the detection sensor.

[0006] According to the structure, based on the region information stored in the storage section, the position of the element disposed on the setting surface by the setting section, and the detection timing of the detection sensor that detects the plotted object, imaging triggering for performing image inspection of the drawing pattern is automatically generated. Therefore, even if the user does not perform the troublesome adjustment work of checking the test-drawn plotted object and adjusting the imaging triggering timing, etc., the imaging image that can be used for performing image inspection of the drawing pattern can be generated by the imaging section.

[0007] As described above, when performing image inspection of the drawing pattern formed on the plotted object, timing adjustment of imaging triggering for imaging the drawing pattern can be easily performed. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a diagram showing the overall structure of an inkjet printing apparatus according to an embodiment of the present application;

[0009] Figure 2 is a block diagram of the inkjet printing apparatus;

[0010] Figure 3 is a plan view showing an installation example of a plotter and an inspection machine;

[0011] Figure 4 is a front view showing an installation example of a plotter and an inspection machine;

[0012] Figure 5 is a flowchart showing an example of a drawing setting and inspection setting step;

[0013] Figure 6 is a diagram showing an example of a setting screen;

[0014] Figure 7 is a diagram showing an example of a job list display screen;

[0015] Figure 8 is a diagram showing an example of a drawing element list display screen;

[0016] Figure 9 is a diagram showing an example of an addition screen;

[0017] Figure 10 is a diagram showing an example of an edit screen;

[0018] Figure 11 is a diagram showing an example of an adjustment screen;

[0019] Figure 12 is a conceptual diagram for determining the end portion of a drawing pattern;

[0020] Figure 13 is a diagram showing an example of the display form of the upstream side and the downstream side of the nearest point;

[0021] Figure 14 This is a diagram illustrating the key points of calculating imaging delay time;

[0022] Figure 15 This is a diagram showing an example of an image being captured;

[0023] Figure 16 This is an example of the input screen when imaging trigger and drawing trigger are linked;

[0024] Figure 17 This is an example of an input screen when imaging trigger and drawing trigger are not linked;

[0025] Figure 18 This is an example of an input screen showing a workpiece moving at a constant speed;

[0026] Figure 19 This is a diagram showing an example of the input screen when using an encoder;

[0027] Figure 20 This is an example of a screen for verifying settings;

[0028] Figure 21 This is a flowchart of the operation of an inkjet printer; and

[0029] Figure 22 It is a timing diagram of the detection sensor, plotter, and inspection machine. Detailed Implementation

[0030] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the following description of preferred embodiments is merely illustrative and is not intended to limit the invention, its applicability, or its uses.

[0031] Figure 1 This is a diagram showing the overall structure of the inkjet printing apparatus 1 according to an embodiment of the present invention during operation, and Figure 2 This is a block diagram of an inkjet printing apparatus 1. The inkjet printing apparatus 1 includes, for example, a plotter 2, an inspection machine 3, a controller 4, and an operating terminal 5.

[0032] The plotter 2 is the part that performs drawing processing on the object to be drawn, and it is configured separately from the controller 4. The inspection machine 3 is the part that determines whether the drawing state performed by the plotter 2 on the object to be drawn is qualified or not, and it is configured separately from the controller 4. The inkjet printing apparatus 1 of this embodiment, having the plotter 2 and the inspection machine 3, is an inkjet printing apparatus that ejects ink for drawing information on an object and determines whether the drawing state is qualified or not by imaging.

[0033] The controller 4 is a part that controls the plotter 2 and the inspection machine 3, and can also be referred to as a control device, a control unit, or the like. Further, the operation terminal 5 is constituted by a personal computer or the like, and is a part in which a user performs operations such as plotter information input, various settings, selection, confirmation, and the like. The operation terminal 5 includes, for example, a terminal-side display portion 5a constituted by a liquid crystal display or the like, and a terminal-side operation portion 5b constituted by a keyboard, a mouse, a pointing device, or the like.

[0034] The above-described configuration example is merely one example, and the present application is not limited to the above-described configuration example. That is, the controller 4 can be integrated into the operation terminal 5, or can be integrated into the plotter 2. Further, the operation terminal 5 can also function as the controller 4. In addition, Figure 1 and Figure 2 The external device 6 constituted by a programmable logic controller (PLC) or the like is also shown in FIG. 1, and is communicably connected to the controller 4. A control signal output from the external device 6 is input to the controller 4. The external device 6 can be a device that constitutes a part of the inkjet printing apparatus 1, or can be a device that is different from the inkjet printing apparatus 1.

[0035] The inkjet printing apparatus 1 is an apparatus for forming a plotter pattern on a workpiece W (an example of an object to be plotted) that is conveyed by a conveyor (an example of a conveying device) 10, and is assembled into a manufacturing line (also referred to as a production line) for use, and is an apparatus for on-line production. The conveyor 10 can be, for example, a belt conveyor, a roller conveyor, or the like. The above-described production line is constituted by the conveyor 10. The production line is installed inside various factories or inside warehouses, or the like. The relative position of the plotter 2 with respect to the conveyor 10 is fixed at a specific positional relationship.

[0036] When the inkjet printing apparatus 1 is operated, a plurality of workpieces W are conveyed in the direction of the arrow A in the state of being placed on a conveying surface 10a of the conveyor 10 in sequence. Therefore, the upstream side in the conveying direction is the left side of FIG. 1, and the downstream side in the conveying direction is the right side of FIG. 1. The plurality of workpieces W are placed on the conveying surface 10a in a state of being spaced apart in the conveying direction, that is, the direction of the arrow A. A direction perpendicular to the direction of the arrow A and along the conveying surface 10a is defined as a width direction. Figure 1 Figure 1 Figure 1

[0037] ​​​The workpiece W is not particularly limited; for example, packaging materials used for packaging various products can be listed. Typical examples of packaging materials include cardboard boxes. The inkjet printing device 1 draws information such as text containing numbers, symbols, barcodes, QR codes, images, marks, illustrations, and combinations thereof on the workpiece W conveyed by the conveyor 10. When only text is drawn, the inkjet printing device 1 can be called a printing device, and the plotter 2 can be called a printing machine. Furthermore, the information drawing by the inkjet printing device 1 also includes printing images. In this case, the inkjet printing device 1 can be called a printing device. In the following description, printing and drawing are collectively referred to as drawing.

[0038] Furthermore, encoder 7 and detection sensor 9 (described later) are connected to controller 4 for detecting the position of workpiece W. Controller 4 detects the position of workpiece W based on signals output from encoder 7 and detection sensor 9. Controller 4 controls plotter 2 to start drawing when workpiece W reaches a predetermined position.

[0039] (The structure of plotter 2)

[0040] Plotter 2 is a DOD (Drop On Demand) type plotter that only ejects ink when drawing is required. However, in addition to the DOD type, it can also be a CIJ (Continuous Ink Jet) type plotter that ejects ink even when no drawing is being performed. Hereinafter, the case of using a DOD type plotter as plotter 2 in this embodiment will be described.

[0041] like Figure 2 As shown, the plotter 2 includes an ink supply unit 20, a printhead drive unit 21, and a DOD printhead (hereinafter referred to as the printhead) 22. The plotter 2 also includes a main unit housing 25 (such as a main unit housing 25) on which the printhead 22 is mounted. Figure 1 (As shown). The main unit housing 25 is fixed to the conveyor 10, etc.

[0042] The printhead 22 is fixed inside the main unit housing 25, and the positional relationship between the main unit housing 25 and the printhead 22 is fixed. In addition, the ink supply unit 20 and the printhead drive unit 21 are also housed inside the main unit housing 25.

[0043] The print head 22 of the DOD-type plotter 2 is a component corresponding to an ejection portion, and ejects ink supplied from the ink cartridge 20a toward the workpiece W conveyed by the conveyer 10. A plotted pattern is formed on the workpiece W by the ink ejected from the print head 22. The print head 22 has various structures, and can be any one of a thermal ink jet type, a valve jet type, and a piezoelectric type, for example. In the present embodiment, a piezoelectric type print head capable of plotting from a low resolution to a high resolution, having a wide plotting width, and having high durability is used as the print head 22.

[0044] The print head 22 is formed with a plurality of ejection ports (not shown in the drawing) arranged in the up-and-down direction, for example. As shown in FIG. 2, on the surface of the main frame 25 opposite to the workpiece W, an elongated opening portion 25a extending in the up-and-down direction is formed. The surface on which the ejection ports of the print head 22 are formed is configured to be directed outward from the opening portion 25a of the main frame 25. Therefore, the ink ejected from the ejection ports of the print head 22 flies out of the main frame 25 through the opening portion 25a of the main frame 25, and adheres to the workpiece W. Figure 1

[0045] The ink supply portion 20 is a portion that supplies ink to the print head 22, and is provided with the ink cartridge 20a as an ink storage portion. Instead of the ink cartridge 20a, an ink reservoir (ink storage portion) that can be replenished with ink can be provided.

[0046] The print head driving portion 21 is controlled by the control portion 40 described later when plotting is performed. The print head driving portion 21 generates a driving electrical waveform for driving the print head 22, and outputs the driving electrical waveform to the print head 22. The driving electrical waveform is a waveform for driving the driving elements (piezoelectric vibration elements) provided for each ejection port of the print head 22, based on the timing of the plotting instruction output from the control portion 40.

[0047] (Configuration of the inspection machine)

[0048] The inspection machine 3 is a device that determines whether the plotted pattern of the plotted workpiece W is acceptable or not based on the plotted pattern, and is equivalent to an image inspection portion. In addition, the inspection machine 3 can also be referred to as an image inspection device. The inspection machine 3 is provided on the downstream side of the plotter 2, and can inspect the plotted state of the workpiece W plotted by the plotter 2.

[0049] ​The inspection machine 3 has an illumination section 30, an imaging section 31, a control section 32, and a storage section 33. The illumination section 30 is constituted by, for example, a light-emitting diode, and is controlled by the control section 32 to emit light at a prescribed timing to illuminate a portion of the workpiece W on which a drawing is made. The imaging section 31 is a section for imaging a drawing pattern formed on the workpiece W and generating an imaged image. This imaging section 31 has an optical system 31a including a receiving lens that receives light emitted from the illumination section 30 and reflected from the surface of the workpiece W, an image sensor 31b that receives light emitted from the optical system 31a, and an AF motor 31c. The AF motor 31c is a section that automatically focuses the drawing portion of the workpiece W by driving a focus lens of the optical system 31a. The manner of automatic focusing is not particularly limited, and for example, a contrast method or the like can be cited.

[0050] The image sensor 31b is constituted by, for example, a CMOS (Complementary Metal Oxide Semiconductor) sensor or the like. The image sensor 31b images the workpiece W that is a drawing target to generate an imaged image. For example, although not shown, a light-receiving amount signal of a light-receiving element possessed by the image sensor 31b is output to an FPGA (Field Programmable Gate Array) for processing, and is also output to a DSP (Digital Signal Processor) for processing.

[0051] The control section 32 has an imaging setting section 32a. The imaging setting section 32a is a section that sets imaging setting parameters and reflects the set imaging setting parameters when imaging the workpiece W. The imaging setting parameters include a plurality of parameters, such as the illumination timing of the illumination section 30, the brightness (amount of light emission), the exposure time of the imaging section 31, the focus (focal position) of the imaging section 31, and the like. Although not shown, a GUI related to the setting of the imaging setting parameters is provided with areas in which the illumination brightness, the exposure time, the focus, and the like can be individually set. When the user inputs each parameter on the GUI, the imaging setting section 32a accepts the setting operation of the user, outputs each parameter to, for example, the storage section 33, and causes the storage section 33 to store. Each parameter can be read from the storage section 33 as needed.

[0052] When acquiring the imaging image data of the workpiece W, the imaging setting section 32a outputs the imaging setting parameter to the illumination section 30 and the imaging section 31. The illumination section 30 and the imaging section 31 act in accordance with the imaging setting parameter. Upon receiving the imaging setting parameter, the illumination section 30 is set in the imaging section 31 in order to reflect the received imaging setting parameter at the time of imaging. Also, upon receiving the imaging setting parameter, the imaging section 31 is set in the imaging section 31 in order to reflect the received imaging setting parameter at the time of imaging. Upon receiving the imaging trigger, the illumination section 30 and the imaging section 31 illuminate the workpiece W in accordance with the imaging setting parameter, and simultaneously perform imaging to acquire the imaging image data of the workpiece W.

[0053] The control section 32, as the inspection tool, can be a section that performs rule-based image inspection, can be a section that performs image inspection using a trained model, or can be a section that simultaneously performs rule-based image inspection and image inspection using a trained model. The control section 32, for example, causes the imaging section 31 to image the workpiece W, acquires imaging image data of the workpiece W, and performs inspection on the acquired imaging image of the workpiece W based on the set inspection tool. Upon performing the inspection, the control section 32 cuts out a range to be inspected from the imaging image. The control section 32 extracts a feature amount of the cut-out inspection range, and determines the extracted feature amount by a determiner. If the cut-out inspection range contains a character, the inspection machine 3 can use a dictionary at the time of character recognition, and thus can perform character recognition processing, so-called OCR. Also, if a barcode or a two-dimensional code is drawn on the workpiece W, the inspection machine 3 can read the barcode or the two-dimensional code.

[0054] The pass / fail determination section 32b provided in the control section 32 of the inspection machine 3 makes an inspection result of the inspection tool, at which time the inspection result is compared with an inspection condition. The inspection condition is acquired from the drawing data generation section 40b of the controller 4. The pass / fail determination section 32b, for example, compares a result of the character recognition processing by the control section 32 with a correct character string acquired from the drawing data generation section 40b, and determines as pass in the case of coincidence and as fail in the case of non-coincidence. In the case of a barcode or a two-dimensional code, a result of the reading by the control section 32 is compared with encoding information acquired from the drawing data generation section 40b, and determined as pass in the case of coincidence and as fail in the case of non-coincidence.

[0055] For example, in the case of one set inspection tool, the inspection result of the set inspection tool is directly output, but in the case of combining a plurality of set inspection tools, an inspection result is further generated based on the inspection result of each inspection tool, and output from the pass / fail determination section 32b.

[0056] (Integral fixing member)

[0057] like Figure 1 As shown, the inkjet printing device 1 includes an integrated fastener 90 for fixing the inspection machine 3 to the main housing 25 that houses the printhead 22. The integrated fastener 90 has a portion for mounting the main housing 25 and a portion for mounting the inspection machine 3. The integrated fastener 90 has a defined dimension in the conveying direction of the workpiece W. When the inspection machine 3 is fixed to the main housing 25 by the integrated fastener 90, the inspection machine 3 and the printhead 22 can maintain a spaced-apart positional relationship, i.e., a fixed positional relationship, in the conveying direction of the workpiece W. By fixing the inspection machine 3 to the main housing 25 by the integrated fastener 90, a fixed relative positional relationship with the printhead 22 is defined.

[0058] The shape and structure of the integrated fitting 90 can be arbitrarily set. Furthermore, the length of the integrated fitting 90 can also be arbitrarily set. The integrated fitting 90 can adjust the length in the conveying direction of the workpiece W. In addition, the integrated fitting 90 can be configured to change the distance between the inspection machine 3 and the main housing 25.

[0059] The integrated metal fitting 90 is detachably mounted on the main unit housing 25 by means of fasteners, and is also detachably mounted on the inspection machine 3 by means of fasteners. Therefore, the inspection machine 3 can be disassembled relative to the main unit housing 25.

[0060] There are various types of integrated hardware fittings 90. Integrated hardware fittings 90 of different sizes can be prepared in advance. The appropriate length of integrated hardware fitting 90 can be selected according to the user's environment, and the inspection machine 3 can be fixed on the main unit housing 25.

[0061] Figure 3 This is a plan view showing an example of the installation of the plotter 2 and the inspection machine 3. When the workpiece W is conveyed in the direction of arrow A, the inspection machine 3 can be installed downstream of the plotter 2 in the direction of workpiece W by setting the integrated fitting 90 shown in the solid line. On the other hand, when the workpiece W is conveyed in the direction of arrow B, which is opposite to the direction of arrow A, the inspection machine 3 can be installed downstream of the plotter 2 in the direction of workpiece W by setting the integrated fitting 90 shown in the dashed line. Furthermore, by simultaneously setting both the integrated fitting shown in the solid line and the integrated fitting 90 shown in the dashed line, both conveying directions of arrow A and arrow B can be accommodated.

[0062] Figure 4 An example of the installation of the plotter 2 and the inspection machine 3 is shown, viewed from the ink ejection side (front view). As shown... Figure 4 As shown, the inspection machine 3 is fixed to the main unit housing 25 by an integrated hardware 90, so that the center of the drawing area in the vertical direction is at the same height as the center of the field of view of the imaging unit 31 of the inspection machine 3 in the vertical direction.

[0063] (Detection sensor)

[0064] As Figure 1 indicated, the inkjet printing apparatus 1 is provided with a detection sensor 9 that detects the arrival of the workpiece W conveyed by the conveyer 10. The detection sensor 9 is provided on the upstream side of the workpiece W conveying direction of the plotter 2. The detection sensor 9 is equipped with, for example, an optical type displacement measuring sensor or a distance sensor (not shown in the figure), and by these sensors, the arrival of the workpiece W conveyed can be detected. When the detection sensor 9 detects the arrival of the workpiece W, it sends a detection signal to the controller 4. The controller 4 determines that the workpiece W has arrived at the predetermined position based on the detection signal output from the detection sensor 9, and after a predetermined plot delay time has elapsed, causes the plotter 2 to start plotting.

[0065] Furthermore, the details will be described later, but in the present embodiment, the detection signal output from the detection sensor 9 is also used to generate an imaging trigger of the imaging section 31, and when it is determined that the workpiece W has arrived at the specified position and a specified imaging delay time has elapsed, the imaging section 31 is caused to perform imaging.

[0066] (Configuration of the controller 4)

[0067] As Figure 2 indicated, the controller 4 is provided with a control section 40, a storage section 41, and an operation / display section 42. The control section 40 is composed of, for example, a microcomputer including a central processing unit, various memories, and the like, and is capable of executing software stored in advance. The control section 40 is provided with a plot setting section 40a, a plot data generation section 40b, an inspection setting section 40c, a display screen generation section 40d, and a mode switching section 40e. The plot setting section 40a, the plot data generation section 40b, the inspection setting section 40c, the display screen generation section 40d, and the mode switching section 40e of the control section 40 are portions composed of hardware and software, and for convenience, they will be described as being divided into the plot setting section 40a, the plot data generation section 40b, the inspection setting section 40c, the display screen generation section 40d, and the mode switching section 40e, but they can be integrated on the hardware.

[0068] The operation / display section 42 includes, for example, a controller side display section 42a composed of a liquid crystal display or the like, and a controller side operation section 42b composed of operation keys or the like. The controller side operation section 42b is a portion that accepts various operations such as plot content, settings, and the like. Various screens generated by the display screen generation section 40d are displayed on the controller side display section 42a, and the user can operate the controller side operation section 42b while viewing the controller side display section 42a. The operation state of the controller side operation section 42b can be acquired by the control section 40.

[0069] The controller-side operation section 42b can be a touch panel. The touch panel is a component capable of detecting a user's finger operation. The form of the touch panel is not particularly limited, and for example, an electrostatic capacity method, an infrared method, and the like can be cited. Operation information of the user to the touch panel is transmitted to the control section 40.

[0070] The drawing setting section 40a is a section that sets the drawing content to be drawn on the drawing target workpiece W. The drawing data generation section 40b is a section that generates drawing data corresponding to the drawing content set by the drawing setting section 40a, while regulating ink ejection from the head 22. The control section 40 outputs a control signal to the head driving section 21 based on the drawing data generated by the drawing data generation section 40b, and controls ink ejection from the ejection port of the head 22.

[0071] The inspection setting section 40c is a section that performs inspection setting of the inspection machine 3. The storage section 41 is a section that stores the relative positional relationship between the inspection machine 3 and the printing head 22. The inspection setting section 40c performs support for the user's inspection setting based on the drawing content set by the drawing setting section 40a and the relative positional relationship stored in the storage section 41.

[0072] Hereinafter, the detailed contents of the drawing setting and the inspection setting will be described based on the flowchart of Figure 5 In step SA1 after the start of the present flowchart, the region information of the drawing pattern region that can be imaged on the workpiece W is stored in the storage section 41. The region information is determined based on the angle of view information that defines the imaging field of view of the imaging section 31. The angle of view information is information for determining the size of the image region used in image inspection, and for example, when a part of the image acquired by the image sensor 31b is enlarged by digital zoom and cropped, and image inspection is performed on the cropped region, the information for determining the cropped region corresponds to the angle of view information. In addition, the distance to the drawing pattern can be acquired based on the amount of movement of the AF motor 31c or the like, and this distance information can also be included in the angle of view information.

[0073] The storage section 41 can store the region information determined based on the relative positional relationship between the printing head 22 and the imaging section 31 and the angle of view information. In the present embodiment, since the integrated metal fitting 90 is used to maintain the fixed positional relationship in which the inspection machine 3 and the printing head 22 are kept at a distance from each other in the conveyance direction of the workpiece W, the relative positional relationship between the printing head 22 and the imaging section 31 can be accurately determined.

[0074] In step SA2, the display screen generation section 40d generates the screen data for displaying the setting screen 100 as shown in Figure 6 , and outputs it to the controller 4, and then the setting screen 100 is displayed on the controller-side display section 42a.

[0075] In the upper portion of the setting screen 100, a state display region 101 that displays the state of the inkjet printing apparatus 1 is provided. In the left side portion of the setting screen 100, a screen switching region 102 is provided. In the screen switching region 102, a home button 102a for displaying a home screen, a job button 102b for displaying a job editing screen, a setting button 102c for displaying a setting screen in which various settings are made, and a logout button 102d for ending the drawing setting are provided. The buttons 102a to 102d are operable by the controller-side operation section 42b. Hereinafter, all the operations on the screen are operable by the controller-side operation section 42b.

[0076] Figure 6 The state in which the home button 102a is pressed down is displayed, and thus, in the setting screen 100, a region 103 located on the right side of the screen switching region 102 displays the home screen 110.

[0077] When the user operates the controller-side operation section 42b and presses down the job button 102b of the setting screen 100, as shown in Figure 7 , the display screen generating section 40d generates screen data that displays a job editing screen 120 in the region 103 of the setting screen 100, and displays it on the controller-side display section 42a. In this job editing screen 120, the drawing setting section 40a accepts the selection of a job to be edited by the user. That is, a job display region 121 that displays a list of jobs is provided in the lower portion of the job editing screen 120. Figure 7 The state shown in indicates the case in which the job "000 SAMPLE 0" at the top of the job display region 121 is selected. A drawing content display region 122 is provided in the upper portion of the job editing screen 120. In the drawing content display region 122, the drawing content of the job selected in the job display region 121 is displayed. The drawing content display region 122 is provided with an edit button 122a.

[0078] Figure 8 The display screen generating section 40d displays a drawing element display region 123 in the lower side portion of the drawing content display region 122 when it detects that the edit button 122a is operated by the user, as shown in Figure 8 In the example shown in , the drawing elements include "00" date, "01" bar code, "02" two-dimensional code, "03" text string "best before", and "04" text string "XYZ Company", and thus, five drawing elements are displayed in the drawing element display region 123.

[0079] Figure 8As shown, on the left side of the drawing content display area 122, a drawing setting button 123a and an inspection setting button 123b are provided. When the drawing setting button 123a is operated, drawing setting is started, and a drawing setting screen is displayed on the setting screen 100. Specifically, as shown in Figure 9 As shown, an addition screen 124 in which a block (also referred to as a drawing block) can be placed is displayed. The block is a region indicating a place where an element is to be placed, and the element is displayed within the block. The addition screen 124 is a portion of the setting screen that displays a setting surface corresponding to a drawing region in which ink ejected from the print head 22 is drawn on the workpiece W. That is, the controller-side display section 42a is a component for displaying the setting surface. Then, the drawing setting section 40a places an element corresponding to a drawing pattern on the setting surface displayed on the controller-side display section 42a based on a user operation.

[0080] Below the addition screen 124, a drawing element display area 123 is provided, and below the drawing element display area 123, an edit button 124a, a copy button 124b, a paste button 124c, and a delete button 124d for the added block are provided. The added block is indicated by a frame 125 (see Figure 9 ). The added block can also be copied by the copy button 124b and pasted by the paste button 124c. Furthermore, the added block can also be deleted by the delete button 124d.

[0081] When there is an added block, if the edit button 124a is operated, as shown in Figure 10 The screen generation section 40d generates screen data for displaying a block edit screen 126 in the region 103 of the setting screen 100 and displays it on the controller-side display section 42a. In the block edit screen 126, for example, when the block is a calendar, a format setting region 126a, a setting region 126b for specifying a date, a setting region 126c for a character height (character size), a setting region 126d for a character pitch, and the like are provided.

[0082] When the position of the block is adjusted, a screen 150 for adjustment as shown in Figure 11 is displayed on the controller-side display section 42a. The screen 150 for adjustment is provided with a display region 151 in which a drawing element is displayed and a position adjustment region 152. The drawing element displayed on the display region 151 and the inspection tool are associated with each other, and when the position adjustment of the drawing element is performed in the position adjustment region 152, the adjustment is reflected in the position adjustment of the attention region of the inspection tool. In the position adjustment region 152, an arrow indicating the direction in which the position is to be adjusted can be operated, or a value inputting the amount of movement, and the like can be performed. Furthermore, in the position adjustment region 152, a selection region 153 selected when the positions of all the blocks are to be adjusted is also provided.

[0083] After placing one or more blocks as described above and adjusting their initial positions, proceed... Figure 5 Step SA3. In step SA3, the user sets the drawing content. When the user operates... Figure 10 When the "Complete" button 126f is pressed, the drawing setting unit 40a determines the drawing content and temporarily saves it. In other words, based on the user's operation, the drawing setting unit 40a places elements corresponding to the drawing pattern on the setting surface and sets the drawing content composed of the placed elements.

[0084] On the setting surface, multiple elements corresponding to the drawing pattern can be configured. For example, the multiple elements can be configured to be arranged along the conveying direction of the conveyor 10, or arranged in a direction perpendicular to the conveying direction of the conveyor 10.

[0085] In step SA4, the drawing setting unit 40a determines the end of the drawing pattern in the conveying direction of the conveyor 10 based on the position of the features arranged on the setting surface. In this embodiment, as... Figure 12 As shown, the end of the drawing pattern in the conveying direction is also called the "nearest point".

[0086] The endpoint (nearest point) of the drawn pattern can be determined by the conveying direction of the conveyor 10 and the content of the drawing. The conveying direction of the conveyor 10 can be input by the user, for example, as shown in the following example: Figure 3 The direction of arrow A or arrow B is shown. The drawing setting unit 40a obtains the conveying direction of the conveyor 10 input by the user.

[0087] by Figure 12 Taking the shown drawing content as an example, we will explain the situation where the drawing setting unit 40a sets the parameters. Figure 12 In this configuration, the conveyor 10's conveying direction is to the right, designated as the X-direction, and the direction perpendicular to the conveying direction as the Y-direction. The drawing pattern drawn on the workpiece W consists of a first block 201 containing the string "ABC" located upstream in the conveying direction and a second block 202 containing the string "DEF" located downstream. In this case, the drawing setting unit 40a designates the upstream end of the second block 202 located upstream in the conveying direction as the nearest point 203. Thus, when a single drawing content contains multiple elements, the drawing setting unit 40a designates the upstream end of the element located upstream in the conveying direction among the multiple elements as the end of the drawing pattern. The upstream end of the element is the portion where the print head 22 begins drawing.

[0088] Figure 13 This is a diagram showing an example of the display configuration of the controller-side display unit 42a. Figure 13In the display form shown, the area 204 on the upstream side of the conveyance direction of the nearest point 203 specified by the drawing setting section 40a is colored in gray, and the area 205 on the downstream side of the conveyance direction of the nearest point 203 is not colored in gray. In this way, the area 204 on the upstream side of the nearest point 203, that is, the area that is not the drawing target, can be clearly displayed. This display form is merely an example, and in addition to the display form in which the color of the area 204 on the upstream side of the conveyance direction and the color of the area 205 on the downstream side of the conveyance direction are changed, the two areas 204, 205 can be distinguished by changing the type of the hatching applied to the two areas 204, 205, or the like. That is, the controller-side display section 42a is configured to cause the area 204 on the upstream side of the conveyance direction of the end portion of the drawing pattern and the area 205 on the downstream side of the conveyance direction of the end portion of the drawing pattern to have different display forms.

[0089] In step SA5, the control section 40 calculates the imaging delay time. The calculated imaging delay time can be stored in, for example, the storage section 41 or the like. Figure 14 is a schematic view of the workpiece W conveyed by the conveyer 10 as viewed from above. The conveyance direction is the right direction, the imaging section 31 is provided on the downstream side of the conveyance direction, and the detection sensor 9 is provided on the upstream side of the conveyance direction of the imaging section 31. The distance LI is the distance from the upstream side edge of the workpiece W in the conveyance direction to the nearest point 203, and can be obtained by Figure 5 steps SA3, SA4 of FIG. 8. The distance L2 is the distance between the detection sensor 9 and the center of the imaging field of view of the imaging section 31, and is known. The distance L3 is the imaging field of view size (size in the conveyance direction) of the imaging section 31, and can be obtained based on the angle of view information. The time advances in the order of the times tl, t2, t3.

[0090] The time tl is the timing at which the upstream side edge of the workpiece W conveyed by the conveyer 10 is detected by the detection sensor 9. The time t2 is the timing at which the upstream side edge of the workpiece W enters the imaging field of view of the imaging section 31, but at the time t2, the nearest point 203 has not yet entered the imaging field of view of the imaging section 31. The time t3 is the timing at which the nearest point 203 enters the upstream side of the imaging field of view of the imaging section 31, and at the time t3, the imaging trigger is issued, and the drawing content can be acquired by the imaging section 31 with the nearest point 203 as the angle of view edge. In order to cause the nearest point 203 to enter the imaging field of view of the imaging section 31 and cause the imaging section 31 to perform imaging, the control section 40 obtains the calculation result of LI + L2 + L3 / 2 and the detection timing of the workpiece W by the detection sensor 9, and calculates the imaging delay to issue the imaging trigger at the timing at which the nearest point 203 enters the imaging field of view of the imaging section 31. That is, the control section 40 determines the timing at which the imaging trigger is issued based on the area information stored in the storage section 41, the positions of the elements configured on the setting surface by the drawing setting section 40a, and the detection timing of the detection sensor 9, and causes the imaging section 31 to perform imaging. Figure 15An example of an image imaged by the imaging section 31 at time t3 is shown. In this way, the control section 40 determines the timing of issuance of the imaging trigger so that the plurality of elements all enter the imaging field of view of the imaging section 31.

[0091] For example, even if the drawing contents such as the date or the lot number differ depending on the workpiece W, the positional relationship between the nearest point 203 and the imaging section 31 does not change, and thus all the imaging images will contain the image of the nearest point 203 at the edge of the angle of view.

[0092] The control section 40 determines the timing of issuance of the imaging trigger so that the end of the drawing pattern specified by the drawing setting section 40a, i.e., the nearest point 203, enters within the end of the imaging field of view of the imaging section 31 and closer to the center of the imaging field of view. That is, since there can be an error in the detection timing of the workpiece W, in order to make the nearest point 203 not overlap the edge of the angle of view, the timing of issuance of the imaging trigger is delayed so as to be located slightly downstream of the edge of the angle of view. The setting of the timing of issuance of the imaging trigger can also cope with such an error in the detection timing.

[0093] Figure 16 An input screen 140 for accepting user input of the parameters related to the distances L1, L2 is shown, and the input screen 140 is generated by the display screen generation section 40d and displayed on the controller-side display section 42a. In the input screen 140, it is possible to select whether to link the imaging trigger with the drawing trigger. That is, the input screen 140 is provided with a linkage button 140a and a non-linkage button 140b which are operated when the imaging trigger is linked with the drawing trigger. When the linkage button 140a is operated, the imaging trigger is linked with the drawing trigger; and when the non-linkage button 140b is operated, the imaging trigger is not linked with the drawing trigger, and the imaging of the imaging section 31 is performed by the externally input imaging trigger.

[0094] When the linkage button 140a is operated, a region 140c for inputting the distance L2a between the print head 22 and the detection sensor which constitutes the distance L2, a region 140d for inputting the distance L1, and a region 140e for inputting the imaging position offset amount (L4) are displayed on the input screen 140. The user inputs the distances in the regions 140c, 140d, 140e, respectively. Based on the input results, the control section 40 can obtain the calculation result of L1+L2+L3 / 2. Further, the screens for inputting the respective distances are not limited to the input screen 140, and can be any screens.

[0095] By determining the nearest point 203, alignment of the drawing area with the set surface corresponding to the drawing area can be achieved, and a drawing trigger is issued so that the nearest point 203 of the element disposed on the set surface corresponding to the drawing area is drawn at a position separated from the edge of the workpiece W by the distance Ll input in the area 140d. In other words, the distance Ll is the distance between the edge of the workpiece W in the drawing area and the position at which the nearest point 203 of the element disposed on the set surface corresponding to the drawing area is drawn.

[0096] The distance L2 is composed of the distance L2a and the distance L2b between the print head 22 and the imaging section 31. In other words, since the detection sensor 9, the print head 22, and the imaging section 31 are arranged in this order from upstream to downstream in the conveyance direction of the workpiece W, the first distance in the arrangement direction of the detection sensor 9 and the imaging section 31 is the sum of the second distance in the arrangement direction of the detection sensor 9 and the print head 22 and the third distance in the arrangement direction of the print head 22 and the imaging section 31. The distance L2b in the conveyance direction of the print head 22 and the imaging section 31, whose relative positional relationship is determined by the fixing jig 90, is stored in the storage section 41, and thus the distance L2a input to the area 140c can be added thereto to calculate the distance L2. If the fixing jig 90 is not used, the relative positional relationship of the print head 22 and the imaging section 31 can be different from the relative positional relationship stored in the storage section 41, and thus, like other parameters, an area for user input of the distance L2b is displayed on the input screen 140.

[0097] The distance L3 is included in the area information determined based on the angle of view information of the imaging section 31 and the fixed positional relationship of the print head 22 and the imaging section 31 and stored in the storage section 41. Specifically, the distance L3 is determined as the distance between both ends of the drawing pattern of the imageable area on the workpiece W in the arrangement direction of the print head 22 and the imaging section 31. The value of the determined distance L3 is stored in the storage section 41.

[0098] The position offset L4 is a parameter used by the user to adjust the distance between the nearest point 203 and the end of the imaging field of view of the imaging section 31. For example, when the proportion of the entire area of the drawing pattern with respect to the imaging field of view is small, by offsetting the nearest point 203 and the end of the imaging field of view of the imaging section 31, an imaging image in which the drawing pattern is located in the central portion of the imaging field of view can be obtained.

[0099] The distance Ll and the distance L2a are also parameters that are referenced when calculating the drawing trigger delay time. That is, the control section 40 issues the drawing trigger when the workpiece W has moved a distance that is the sum of Ll and L2a in the conveying direction from upstream to downstream after the edge of the workpiece W is detected by the sensor 9. In other words, part of the set of parameters of the distances Ll, L2, L3, L4 that are required to calculate the imaging delay time of the imaging trigger is common to the distance Ll, L2a that is required to calculate the drawing delay time of the drawing trigger. That is, since the imaging trigger and the drawing trigger cooperate with each other, positional displacement does not easily occur for the imaged image of the drawing pattern formed on the workpiece W, and the user input setting becomes easy. For example, even if the distance Ll and the distance L2a that the user inputs in the regions 140c, 140d are erroneous, since the parameters that are referenced when calculating the printing delay time and the imaging delay time are common, the drawing timing and the imaging timing do not relatively displace.

[0100] Once the distances Ll, L2, L3, L4 are determined, the time can be calculated by acquiring the moving speed information of the workpiece W when the workpiece W is conveyed. The speed information can be selected by the user, and can be acquired on the assumption that the workpiece W moves at a constant speed, or can be acquired using the encoder 7. Figure 18 An input screen 141 when the workpiece W moves at a constant speed is shown. Furthermore, Figure 19 An input screen 141 when the encoder 7 is used is shown. The input screen 141 is provided with a speed information selection region 141a and a speed input region 141b. In the speed information selection region 141a, one of "constant speed" and "encoder" can be selected and input. When "constant speed" is selected, the conveying speed can be input in the speed input region 141b. The control section 40 calculates the time using the conveying speed input to the speed input region 141b and the distances Ll, L2, L3, L4. On the other hand, when "encoder" is selected, as shown in the input screen 141, Figure 19 the resolution input region 141c for inputting the resolution of the encoder and the pulse input region 141d for inputting the pulse of the encoder are displayed. The control section 40 calculates the time using the distances Ll, L2, L3, and the signal output from the encoder, the resolution input to the resolution input region 141c, and the pulse input to the pulse input region 141d.

[0101] Figure 17The input screen 140 is displayed when the non-linkage button 140b is operated. When the non-linkage button 140b is operated, the area 140c for inputting distance L2a, the area 140d for inputting distance L1, and the area 140f for inputting imaging delay time are displayed. In area 140f, the delay time input from an external source can be used as the imaging delay time input. After receiving input from the detection sensor 9, if it is determined that the time input in area 140f has elapsed, an imaging trigger is issued. In other words, distances L2a and L1 are used to determine the timing of the drawing trigger, but not for calculating the timing of the imaging trigger. That is, the imaging trigger and the drawing trigger are not linked.

[0102] exist Figure 5 In step SA6, as shown, the setting is checked. For example, when... Figure 8 When the user operates the test setting button 123b shown, the test setting begins, and the following is displayed on the setting screen 100: Figure 20 The test setup screen shown. Figure 20 The setup screen 100 shown includes a main image display area 160 and an inspection tool display area 161 that displays a list of inspection tools. The main image of the workpiece W acquired by the imaging unit 31 of the inspection machine 3 is displayed on the main image display area 160.

[0103] On the left side of the setting screen 100, there are a main image registration button 160a, a tool setting button 160b, a test run button 160c, and a verification setting save button 160d. When the main image registration button 160a is operated, the imaging unit 31 images the workpiece W, acquires the main image, and displays it in the main image display area 160. When acquiring the main image, the imaging unit 31 can image the drawing pattern formed on the workpiece W by the ink ejected from the print head 22, thereby generating the main image.

[0104] The main image displayed in the main image display area 160 can be configured to be selected from previously acquired images based on user operation, or it can be configured so that the user can choose to select the main image from previously acquired images or to obtain the main image by imaging the workpiece W by the imaging unit 31. In the case of selecting the main image from previously acquired images, it is possible to... Figure 5 After step SA5, when testing the printing, the imaging unit 31 is controlled to image the drawing pattern formed by the ink ejected by the ejector unit on the object to be drawn, and the acquired image is displayed as the main image in the main image display area 160.

[0105] When the tool setting button 160b is pressed, the inspection tool display area 161 will display information about the inspection tools. In this example, the main image display area 160 shows the area of ​​interest 100a for the string inspection tool, the area of ​​interest 100b for the barcode inspection tool, and the area of ​​interest 100c for the QR code inspection tool. The inspection action can be tested by pressing the test run button 160c.

[0106] By performing the inspection settings, the block and the inspection tool are connected to each other. Afterwards, the user operates the inspection settings save button 160d to save the connection state between the block and the inspection tool in the storage unit 41, etc.

[0107] Below, based on Figure 21 The flowchart shown illustrates the operation of the inkjet printing apparatus 1. In step SB1, the control unit 40 acquires the imaging delay time stored in the storage unit 41, etc. During operation, since the conveyor 10 sequentially transports multiple workpieces W, at a certain point, the detection sensor 9 will detect the arrival of the workpiece W (step SB2).

[0108] In step SB3, the control unit 40 issues a trigger signal. Figure 22 This is a timing diagram of the detection sensor 9, the plotter 2, and the inspection machine 3. When the detection sensor 9 detects the arrival of the workpiece W, it outputs a detection signal. After receiving the signal from the detection sensor 9, the control unit 40 adds a predetermined plotting delay time and outputs a plotting start trigger signal to the plotting data generation unit 40b. Upon receiving the plotting start trigger signal, the plotting data generation unit 40b generates plotting data and outputs it to the plotter 2. The plotter 2, upon receiving the plotting data, executes the plotting. In this way, the print head 22 ejects ink onto the workpiece W at the appropriate time based on the detection timing of the detection sensor 9.

[0109] The control unit 40 outputs an imaging trigger to the imaging unit 31, causing the plotter 2 to perform drawing and the inspection machine 3 to perform inspection of the drawn pattern. Specifically, upon receiving a signal from the detection sensor 9, the control unit 40 adds the imaging delay time obtained in step SB1 and outputs an imaging trigger to the imaging unit 31. In this way, the control unit 40 can determine the timing of the imaging trigger based on the timing of ink ejection from the printhead 22 onto the workpiece W. Thus, as... Figure 14 As shown at time t3, as the image for verification, an image containing the nearest point 203 at the edge of the viewpoint can be obtained, thus enabling accurate verification.

[0110] In the present embodiment, as a mode of imaging the drawing pattern, there are a first mode and a second mode. The first mode is a mode in which the imaging section 31 images the drawing pattern based on the area information stored in the storage section 41, the positions of the elements configured on the setting surface by the drawing setting section 40a, and the timing of the detection timing of the detection sensor 9. The second mode is a mode in which the imaging section 31 images the drawing pattern based on the delay time or delay distance with respect to the detection timing of the detection sensor 9 set by the user and the timing of the detection timing of the detection sensor 9. The switching of the first mode and the second mode is performed by the mode switching section 40e (as shown in FIG. 8, for example). For example, when the user selects the first mode, the mode switching section 40e causes the imaging section 31 to perform imaging in the first mode; and when the user selects the second mode, the mode switching section 40e causes the imaging section 31 to perform imaging in the second mode. Figure 2

[0111] The above-described embodiments are merely examples and should not be construed as limiting. Furthermore, modifications or alterations that fall within the equivalent range of the claims are within the scope of the present application.

[0112] Industrial Applicability

[0113] As described above, the present disclosure is useful in cases where various information is drawn on a packaging material such as corrugated paper.​

Claims

1. An inkjet printing device, characterized in that, include: Ink container, which holds ink; The ejector section ejects ink supplied from the ink reservoir toward the drawing object being conveyed by the conveying device. An imaging unit that images the drawing pattern formed on the object being drawn by the ink ejected by the ejection unit and generates an image. An image inspection unit performs image inspection on the drawing pattern using the imaging image generated by the imaging unit; The storage unit stores area information representing the area on the object to be drawn that can be imaged with a drawing pattern, determined based on the viewing angle information of the imaging field of the imaging unit; The display unit shows a setting surface corresponding to the drawing area on the object drawn by the ink ejected by the ejection unit; The setting unit, based on user operation, configures elements corresponding to the drawing pattern on the setting surface displayed on the display unit, and sets the drawing content; A detection sensor that detects the arrival of the drawn object conveyed by the conveying device; as well as The control unit determines the timing of the imaging trigger based on the area information stored in the storage unit, the position of the element configured on the setting surface by the setting unit, and the detection timing of the detection sensor.

2. The inkjet printing apparatus according to claim 1, wherein, The control unit also determines the timing of the imaging trigger based on the first relative positional relationship between the detection sensor and the imaging unit in the arrangement direction.

3. The inkjet printing apparatus according to claim 1, wherein, The control unit determines the timing of the drawing trigger based on the position of the element arranged on the setting surface by the setting unit, the second relative positional relationship between the detection sensor and the ejection part in the arrangement direction, and the detection timing of the detection sensor. The timing of the imaging trigger is determined based on the second relative positional relationship between the detection sensor and the ejector in the arrangement direction, and the third relative positional relationship between the ejector and the imaging unit in the arrangement direction.

4. The inkjet printing apparatus according to claim 3, wherein, It also includes an input section for inputting the second relative positional relationship. The storage unit stores the third relative positional relationship.

5. The inkjet printing apparatus according to claim 1, wherein, The storage unit stores the region information determined based on the relative positional relationship between the imaging unit and the ejection unit, as well as the viewing angle information.

6. The inkjet printing apparatus according to claim 1, wherein, The ejector unit ejects ink onto the object being drawn at a timing based on the detection timing of the detection sensor. The control unit determines the timing of the imaging trigger based on the area information stored in the storage unit, the position of the element configured on the setting surface by the setting unit, and the timing of the ejection unit ejecting ink onto the drawn object.

7. The inkjet printing apparatus according to claim 1, wherein, The setting unit determines the end of the drawing pattern in the conveying direction of the conveying device based on the position of the element provided on the setting surface. The control unit determines the timing of the imaging trigger based on the positional relationship between the end of the area shown by the area information and the end of the drawing pattern determined by the setting unit, as well as the detection timing of the detection sensor.

8. The inkjet printing apparatus according to claim 1, wherein, Equipped with a mode switching unit capable of switching between the following modes: In the first mode, the imaging unit images the drawing pattern based on the area information stored in the storage unit, the position of the element arranged on the setting surface by the setting unit, and the detection timing of the detection sensor. In the second mode, the imaging unit images the drawing pattern based on a delay time or delay distance set by the user relative to the detection timing of the detection sensor and the timing of the detection timing of the detection sensor.

9. The inkjet printing apparatus according to claim 1, wherein, The imaging unit generates a main image by imaging the drawing pattern formed on the object being drawn by the ink ejected from the ejection unit.

10. The inkjet printing apparatus according to claim 7, wherein, Based on user operation, the setting unit arranges multiple elements corresponding to the drawing pattern on the setting surface displayed on the display unit. The control unit determines the timing of the imaging trigger, so that all the elements enter the imaging field of view of the imaging unit.

11. The inkjet printing apparatus according to claim 7, wherein, Based on user operation, the setting unit arranges multiple elements corresponding to the drawing pattern on the setting surface displayed on the display unit, and at the same time, the end of the element located at the upstream of the conveying direction of the conveying device among the multiple elements is determined as the end of the drawing pattern.

12. The inkjet printing apparatus according to claim 7, wherein, The display unit displays the area upstream of the end of the drawing pattern in the conveying direction of the conveying device, which is different from the area upstream of the end of the drawing pattern in the conveying direction of the conveying device, which is different from the area downstream of the end of the drawing pattern in the conveying direction of the conveying device, in different display modes.

13. The inkjet printing apparatus according to claim 7, wherein, The control unit determines the timing of the imaging trigger, such that the end of the drawing pattern determined by the setting unit is closer to the center of the imaging field of view than the end of the imaging field of view of the imaging unit.

Images