CN112319046A - Positioning calibration device, ink-jet printer and jet printing point coordinate positioning calibration method - Google Patents
Positioning calibration device, ink-jet printer and jet printing point coordinate positioning calibration method Download PDFInfo
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- CN112319046A CN112319046A CN202010949487.3A CN202010949487A CN112319046A CN 112319046 A CN112319046 A CN 112319046A CN 202010949487 A CN202010949487 A CN 202010949487A CN 112319046 A CN112319046 A CN 112319046A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of ink-jet printing, and particularly discloses a positioning and calibrating device which comprises a first imaging device and a second imaging device, wherein the first imaging device and the second imaging device can move relatively; and a bracket, one end of which is fixedly connected with the first imaging device and the other end of which is provided with an optical component; wherein the optical component is disposed between an imaging end of the first imaging device and an imaging end of the second imaging device; a fixed gap is preset between the optical component and the imaging end of the first imaging device. According to the invention, the first focus of the first imaging device is calibrated in advance to clearly image on the optical component, and the first imaging device and the optical component are kept relatively stable, so that the second focus of the second imaging device is only required to be adjusted to be overlapped and aligned with the first focus of the first imaging device during positioning and calibration, the process is simple, and the accuracy is high.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to a positioning and calibrating device, an ink-jet printer and a coordinate positioning and calibrating method of a jet printing point.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The OLED is a device that generates electroluminescence using a multi-layer organic thin film structure, and is a phenomenon of emitting light by injection and recombination of carriers, and the intensity of light emission is proportional to the injected current. Under the action of an electric field, holes generated by an anode and electrons generated by a cathode move, are respectively injected into a hole transport layer and an electron transport layer, and migrate to a light emitting layer. The OLED is easy to manufacture, only needs low driving voltage, is very outstanding in meeting the application of a flat panel display, is lighter and thinner, has high brightness, low power consumption, quick response, high definition, good flexibility and high luminous efficiency, and can meet the new requirements of consumers on display technology. The existing OLED preparation method generally comprises two methods of evaporation and ink jet printing, wherein the ink jet printing OLED technology is simple in manufacturing process, and compared with the evaporation technology, the ink jet printing is more accurate and has more advantages particularly when being used for processing a large-size panel.
The inventor finds that at least the following problems exist in the existing ink-jet printing technology:
the position of a nozzle of the existing ink-jet printer relative to a printing substrate is calculated theoretically through a mechanical design structure of the equipment, the position of a nozzle fixing groove on a gantry support of the equipment can be obtained through a mechanical design drawing, the position of the nozzle on a nozzle plane can be obtained through a mechanical design drawing of a nozzle manufacturer, and the position of jet printing on the substrate can be obtained through a CCD camera installed on a gantry.
The error generated when the equipment is mechanically installed cannot be considered in the calculation mode, for example, the drop point error caused by the error generated when the equipment hardware is installed is in millimeter level in the spray printing process of an OLED or quantum dot color film with high drop point precision requirement and a large number of nozzles, and the printing original point needs to be continuously adjusted when the process is debugged, so that a large amount of time is needed for correction. Meanwhile, in an OLED or quantum dot jet printing process, the cost of equipment consumables is far higher than that of a traditional jet printing process, a high-price glass substrate with photoresist is needed to be spent for correcting dot drop deviation, and a certain amount of high-price OLED or quantum dot ink is consumed.
How to further improve the accuracy of the drop point of the spray head on the substrate and meet the requirement of the printing display industry on the ultra-high accuracy of ink-jet printing has great significance.
Disclosure of Invention
The first objective of the present invention is to provide a positioning calibration apparatus, so as to solve the defects of complicated calibration process and low precision of the nozzle in the prior art, and satisfy the requirement of fast and high-precision inkjet printing.
In order to achieve the above object, the technical solution provided by the present invention comprises: the imaging device comprises a first imaging device and a second imaging device which can move relatively, wherein the imaging end of the first imaging device is arranged opposite to the imaging end of the second imaging device; and a bracket, one end of which is fixedly connected with the first imaging device and the other end of which is provided with an optical component; wherein the optical component is disposed between an imaging end of the first imaging device and an imaging end of the second imaging device; a fixed gap is preset between the optical component and the imaging end of the first imaging device.
Furthermore, the optical component comprises a fixed platform and a positioning target, one end of the fixed platform is connected with the support, and the other end of the fixed platform is provided with an annular mounting seat matched with the positioning target.
Furthermore, the fixed platform is close to the one end of support with rotate in the horizontal direction through the axis of rotation between the support and be connected, the fixed platform is close to the one end of support is equipped with first rotation stopping portion, be equipped with on the support with the second rotation stopping portion that first rotation stopping portion corresponds.
Further, the positioning target is an optical glass sheet.
Further, the light transmittance of the localization target is greater than or equal to 60%.
Furthermore, the positioning target includes a base, a plurality of target area blocks are arranged on an end surface of the base close to the first imaging device, a height difference between adjacent target area blocks is greater than 0, and each target area block corresponds to one coordinate value.
Further, the height of the target area block increases along the extending direction of the meridian line.
Further, the target region blocks are symmetrically distributed on the base.
Further, the first imaging device is a CCD camera, and the second imaging device is a CCD camera.
The second objective of the present invention is to provide an inkjet printer, which includes a nozzle module, a conveyor belt, and the above positioning and calibrating device, wherein the nozzle module is fixedly connected to the bracket, and the conveyor belt is fixedly connected to the second imaging device.
The third purpose of the invention is to provide a method for determining the coordinates of the jet printing points of the ink-jet printer, which comprises the following steps:
starting a first imaging device of the positioning and calibrating device with the position and angle debugging completed so as to enable a first focus of the first imaging device to be clearly imaged on an optical component of the positioning and calibrating device;
adjusting a second imaging device disposed opposite the first imaging device to sharply image a second focal point of the second imaging device on the optical component; and
the second imaging device is further adjusted so that the second focal point overlaps the first focal point on the optical component.
Further, the method comprises the following steps:
allocating a unique identifier for each target area block on the base in advance, wherein each identifier corresponds to a unique coordinate value;
recording a first coordinate value of the target region block corresponding to the first focus when the first focus is sharply imaged on the optical component;
recording a second coordinate value of the target region block corresponding to the second focus when the second focus is sharply imaged on the optical component; and
adjusting a relative position between the second imaging device and the optical component based on the first coordinate value so that a second coordinate value of a second focus of the second imaging device is equal to the first coordinate value.
The method establishes the relation between the motion axes of different planes through the positioning calibration device, and obtains the motion parameters through the relation.
The invention has the beneficial effects that:
the positioning calibration device provided by the invention comprises a first imaging device and a second imaging device which can move relatively, wherein the imaging end of the first imaging device is arranged opposite to the imaging end of the second imaging device; and a bracket, one end of which is fixedly connected with the first imaging device and the other end of which is provided with an optical component; wherein the optical component is disposed between an imaging end of the first imaging device and an imaging end of the second imaging device; a fixed gap is preset between the optical component and the imaging end of the first imaging device. According to the invention, the first focus of the first imaging device is calibrated in advance to clearly image on the optical component, and the first imaging device and the optical component are kept relatively stable, so that the second focus of the second imaging device is only required to be adjusted to be overlapped and aligned with the first focus of the first imaging device during positioning and calibration, the process is simple, and the accuracy is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a positioning calibration apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an optical component in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a localization target in an embodiment of the present invention;
fig. 4 is a flowchart of a method for calibrating coordinate positioning of a printing point according to an embodiment of the present invention.
Reference numerals: 1. a first imaging device; 2. a second imaging device; 3. an imaging end; 4. an optical member; 41. a fixed platform; 411. an annular mounting seat; 42. positioning a target; 421. a base; 422. a target region block; 5. a support; 6. a first rotation stop portion.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1-3 illustrate an embodiment of a positioning calibration apparatus according to the present invention.
Referring to fig. 1-3, the positioning calibration apparatus mainly includes a first imaging apparatus 1 and a second imaging apparatus 2 capable of moving relatively, an imaging end 3 of the first imaging apparatus 1 is disposed opposite to an imaging end 3 of the second imaging apparatus 2; and a bracket 5, one end of which is fixedly connected with the first imaging device 1, and the other end of which is provided with an optical component 4; wherein the optical component 4 is placed between the imaging end 3 of the first imaging device 1 and the imaging end 3 of the second imaging device 2; a fixed gap is preset between the optical component 4 and the imaging end 3 of the first imaging device 1.
In the present embodiment, the positioning calibration apparatus includes a first imaging apparatus 1, a second imaging apparatus 2, an optical component 4 and a bracket 5. Specifically, the first imaging device 1 and the second imaging device 2 are disposed opposite to each other and are relatively movable. The first imaging device 1 and the second imaging device 2 may be disposed opposite to each other in a practical installation, but the first imaging device 1 is not limited to be disposed above or the second imaging device 2 is disposed above.
The first imaging device 1 and the second imaging device 2 may both adopt CCD cameras. The CCD is a charge coupled device (charge coupled device) for short, which can change light into electric charge and store and transfer the electric charge, and can also take out the stored electric charge to change the voltage, so it is an ideal camera element.
One end of the bracket 5 is fixedly connected with the outer wall of the first imaging device 1, and the other end is assembled with the optical component 4. The optical component 4 is disposed between the imaging end 3 of the first imaging device 1 and the imaging end 3 of the second imaging device 2, so as to facilitate the second focuses of the first imaging device 1 and the second imaging device 2 to be overlapped on the optical component 4 in the subsequent operation.
In order to simplify the operation step of positioning the calibration device, in the present embodiment, the distance between the imaging end 3 of the first imaging device 1 and the optical component 4 is adjusted to the first focal point of the first imaging device 1 in advance to enable clear imaging on the optical component 4, and the distance is set to a fixed value, so that the positional relationship between the first imaging device 1 and the optical component 4 does not need to be adjusted in the subsequent operation process, and errors occurring in the operation process can be reduced.
Meanwhile, after the first imaging device 1 and the second imaging device 2 are positioned and calibrated to enter a working state, the relative distance between the first imaging device 1 and the second imaging device 2 in the Z-axis direction is not changed, namely the Z-axis direction is not the working direction, and a high-precision fine-tuning motor for adjusting the lifting of the first imaging device 1 or the second imaging device 2 is not needed, so that the significance of installing the high-precision fine-tuning motor in the Z-axis direction is small, and the processing cost is increased. Therefore, the above-described problem can be solved by setting the distance between the first imaging device 1 and the optical member 4 at this time to a fixed value after the first focal point is clearly imaged on the optical member 4.
In a preferred embodiment of the present invention, referring to the drawings, the optical component 4 includes a fixing platform 41 and a positioning target 42, one end of the fixing platform 41 is connected to the bracket 5, and the other end is provided with an annular mounting seat 411 adapted to the positioning target 42.
In the present embodiment, the optical component 4 includes a fixing platform 41 and a positioning target 42. Specifically, one end of the fixing platform 41 is connected to the bracket 5, and the other end of the fixing platform is provided with an annular mounting seat 411 adapted to the positioning target 42, so that the positioning target 42 can be mounted and dismounted conveniently. The positioning target 42 is used for aligning the second focus of the first imaging apparatus 1 or the second imaging apparatus 2, and is preferably made of an optical glass sheet, and the light transmittance of the positioning target 42 is limited to be greater than or equal to 60%, so that the second focuses of the first imaging apparatus 1 and the second imaging apparatus 2 can achieve better alignment effect and imaging effect on the positioning target 42.
In a more preferred embodiment of the present invention, referring to fig. 1 to 3, one end of the fixed platform 41 close to the bracket 5 is rotatably connected to the bracket 5 through a rotating shaft in a horizontal direction, one end of the fixed platform 41 close to the bracket 5 is provided with a first rotation stopping portion 6, and the bracket 5 is provided with a second rotation stopping portion corresponding to the first rotation stopping portion 6.
In the present embodiment, the end of the fixing platform 41 close to the support 5 is connected to the support 5 by a rotating shaft (not shown) in a rotating manner in a horizontal direction, and when the positioning target 42 is needed, the positioning target 42 is rotated out around the rotating shaft again only after the first focus for calibrating the first imaging device 1 can clearly image on the positioning target 42, and is kept stable under the limiting action of the first rotation stopping portion 6 (e.g. a side chamfer) and the second rotation stopping portion (e.g. a caulking groove, not shown). When the positioning target 42 is not needed, the positioning target 42 only needs to be rotated in the opposite direction without being removed, thereby improving the detection efficiency and the detection stability.
In a preferred embodiment of the present invention, referring to fig. 1-3, the positioning target 42 includes a base 421, a plurality of target area blocks 422 are disposed on an end surface of the base 421 close to the first imaging device 1, a height difference between adjacent target area blocks 422 is greater than 0, wherein each target area block 422 corresponds to a coordinate value.
Since the positioning target 42 may have a certain error in practical applications, even if the first focal point of the first imaging apparatus 1 is calibrated on the positioning target 42 in advance, the first focal point of the first imaging apparatus 1 cannot always keep clear imaging under the influence of some external factors. In order to adjust the first focus quickly and accurately in the above situation, in the present embodiment, the positioning target 42 includes a base 421, a plurality of target area blocks 422 are arranged on an end surface of the base 421 close to the first imaging device 1, and a height difference between adjacent target area blocks 422 is greater than 0. Due to the inconsistent height between adjacent target area blocks 422, the positioning target 42 can be fine-tuned when rotated about the axis of rotation.
Meanwhile, by assigning a coordinate value to each target region block 422, the problem of insufficient depth of field in the Z-axis direction during the alignment process of the first imaging device 1 and the second imaging device 2 can be solved, and secondly, the alignment in the X, Y direction can be performed first under the condition that the Z-direction is not aligned yet, and the alignment error in the Z-direction can be calculated by using the coordinate values of the aligned target region blocks 422. That is, by calculating the alignment error of the first imaging apparatus 1 and the second imaging apparatus 2 which cannot be aligned absolutely using the coordinate values of the target area block 422, the calibration problem which may occur due to the stroke or the mounting error during the adjustment process is solved.
In a further preferred embodiment of the present invention, as shown with reference to fig. 2-3, the height of the target area block 422 increases in the direction of extension of the meridian.
In the present embodiment, the height of the target area block 422 increases along the extending direction of the meridian line to ensure that the height of the target area block 422 increases or decreases when the positioning target 42 rotates around the rotating shaft.
In a preferred embodiment of the present invention, as shown with reference to FIGS. 2-3, the target area blocks 422 are symmetrically distributed on the base 421.
In this embodiment, the target area blocks 422 are symmetrically distributed on the base 421, so that when the positioning target 42 moves clockwise or counterclockwise around the rotation axis, the height variation of the target area blocks 422 is stable, and when the positioning target 42 is not rotated clockwise, the height variation range of the target area blocks 422 is 10-15 μm, and then when the positioning target 42 is rotated counterclockwise with the same rotation amplitude, the height variation range of the target area blocks 422 is 15-30 μm.
In another embodiment, an inkjet printer is provided, which includes a nozzle module fixedly connected to the bracket 5, a conveyor belt fixedly connected to the second image forming device 2, and the above positioning and calibrating device.
In this embodiment, the inkjet printer clearly images the first focus of the first imaging device 1 calibrated in advance on the optical component 4 through the positioning calibration device, and keeps the first imaging device 1 and the optical component 4 relatively stable, so that when performing positioning calibration, the calibration of the inkjet head can be completed only by adjusting the second focus of the second imaging device 2 to be overlapped and aligned with the first focus of the first imaging device 1. The printer is simple in operation process, high in precision and good in printing effect.
With the above embodiment, a method for determining coordinates of a printing point of an inkjet printer can be obtained, as shown in fig. 4, including the following steps:
s11, turning on the first imaging device 1 of the positioning calibration device whose position and angle are adjusted, so that the first focus of the first imaging device 1 is clearly imaged on the optical component 4 of the positioning calibration device;
s12, adjusting the second imaging device 2 disposed opposite to the first imaging device 1 so that the second focal point of the second imaging device 2 is clearly imaged on the optical component 4; and
s13, the second imaging device 2 is further adjusted so that the second focal point overlaps the first focal point on the optical component 4.
Specifically, the method realizes the alignment process between the first focus and the second focus by the following steps:
allocating a unique identifier to each target region block 422 on the base 421 in advance, wherein each identifier corresponds to a unique coordinate value;
recording a first coordinate value of the target region block 422 corresponding to the first focus when the first focus is clearly imaged on the optical part 4;
recording a second coordinate value of the target region block 422 corresponding to the second focus when the second focus is clearly imaged on the optical member 422; and
based on the first coordinate value, the relative position between the second imaging device 2 and the optical component 4 is adjusted so that the second coordinate value of the second focus of the second imaging device 2 is equal to the first coordinate value.
According to the method, the first focus of the first imaging device 1 is calibrated in advance to clearly image on the optical component 4, and the first imaging device 1 and the optical component 4 are kept relatively stable, so that only the second focus of the second imaging device 2 needs to be adjusted to be overlapped and aligned with the first focus of the first imaging device 1 when positioning calibration is carried out, the process is simple, and the accuracy is high.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A positioning calibration device, comprising:
the imaging device comprises a first imaging device and a second imaging device which can move relatively, wherein the imaging end of the first imaging device is arranged opposite to the imaging end of the second imaging device; and
one end of the bracket is fixedly connected with the first imaging device, and the other end of the bracket is provided with an optical component;
wherein the optical component is disposed between an imaging end of the first imaging device and an imaging end of the second imaging device;
a fixed gap is preset between the optical component and the imaging end of the first imaging device.
2. The positioning and calibrating device according to claim 1, wherein the optical component comprises a fixing platform and a positioning target, one end of the fixing platform is connected to the bracket, and the other end of the fixing platform is provided with an annular mounting seat adapted to the positioning target.
3. The positioning and calibrating device according to claim 1, wherein one end of the fixed platform close to the support is connected with the support in a rotating manner in a horizontal direction through a rotating shaft, a first rotation stopping portion is arranged at one end of the fixed platform close to the support, and a second rotation stopping portion corresponding to the first rotation stopping portion is arranged on the support.
4. The positioning and calibrating device according to claim 3, wherein said positioning target is an optical glass sheet.
5. The positioning and calibration device of claim 1, wherein the transmittance of the positioning target is greater than or equal to 60%.
6. The positioning and calibrating apparatus according to claim 5, wherein the positioning target includes a base, a plurality of target area blocks are disposed on an end surface of the base near the first imaging device, a height difference between adjacent target area blocks is greater than 0, and each target area block corresponds to a coordinate value.
7. The positioning calibration device of claim 6, wherein the height of the target area block increases along the extending direction of the meridian line.
8. The alignment device of claim 7 wherein the target area blocks are symmetrically distributed on the base.
9. The positioning and calibration device of claim 1, wherein said first imaging device is a CCD camera and said second imaging device is a CCD camera.
10. An inkjet printer comprising a nozzle module and a conveyor belt, the nozzle module being fixedly connected to the carriage, and the conveyor belt being fixedly connected to the second image forming device, and the alignment apparatus as claimed in any one of claims 1 to 9.
11. A method for positioning and calibrating the coordinates of a jet printing point of an ink-jet printer is characterized by comprising the following steps:
starting a first imaging device of the positioning and calibrating device with the position and angle debugging completed so as to enable a first focus of the first imaging device to be clearly imaged on an optical component of the positioning and calibrating device;
adjusting a second imaging device disposed opposite the first imaging device to sharply image a second focal point of the second imaging device on the optical component; and
the second imaging device is further adjusted so that the second focal point overlaps the first focal point on the optical component.
12. The method of calibrating the positioning of the left hand side of a dot in an ink jet printer as claimed in claim 11, further comprising the steps of:
allocating a unique identifier for each target area block on the base in advance, wherein each identifier corresponds to a unique coordinate value;
recording a first coordinate value of the target region block corresponding to the first focus when the first focus is sharply imaged on the optical component;
recording a second coordinate value of the target region block corresponding to the second focus when the second focus is sharply imaged on the optical component; and
adjusting a relative position between the second imaging device and the optical component based on the first coordinate value so that a second coordinate value of a second focus of the second imaging device is equal to the first coordinate value.
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