CN110254051B - Ink-jetting state detection system and detection method of ink-jetting head - Google Patents
Ink-jetting state detection system and detection method of ink-jetting head Download PDFInfo
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- CN110254051B CN110254051B CN201910547073.5A CN201910547073A CN110254051B CN 110254051 B CN110254051 B CN 110254051B CN 201910547073 A CN201910547073 A CN 201910547073A CN 110254051 B CN110254051 B CN 110254051B
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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
- B41J2/135—Nozzles
- B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16579—Detection means therefor, e.g. for nozzle clogging
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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
Abstract
The application discloses an ink-jetting state detection system and a detection method of an ink-jetting head, wherein the detection system comprises an optical detection device and a control device; the optical detection device is arranged corresponding to the ink-jet head and used for sending an optical detection signal with preset intensity to the ink drop when the ink-jet head ejects the ink drop, receiving an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sending the optical feedback signal to the control device; the control device is electrically connected with the optical detection device and used for detecting the ink jetting state of the ink jet head according to the optical feedback signal. This application can monitor the inkjet state of ink gun at whole inkjet printing in-process, has improved the work efficiency and the printing quality of ink gun.
Description
Technical Field
The present disclosure relates to inkjet printing technologies, and particularly to a system and a method for detecting an inkjet status of an inkjet head.
Background
At present, the development trend of an Organic Light-Emitting Diode (OLED) is going to Ink-Jet Printing (IJP), and a nozzle of an inkjet Printing apparatus may be in an abnormal state due to Ink path pollution, Ink precipitation, dust, water vapor and the like after working for a long time, and the abnormal state of the nozzle may cause abnormal Ink-Jet amount and speed, thereby affecting Printing quality; the corresponding monitoring device is lacked to detect the ink-jet state of the nozzle in the ink-jet printing process, and the abnormal ink-jet state of the nozzle cannot be fed back and corrected in time, so that the printing quality is abnormal.
Disclosure of Invention
The embodiment of the application provides a system and a method for detecting the ink jetting state of an ink jet head, which aim to solve the technical problem that the printing quality is abnormal because the ink jetting state of the ink jet head cannot be fed back and corrected in time in the ink jetting printing process.
The embodiment of the application provides an ink-jetting state detection system of an ink-jetting head, which comprises an optical detection device and a control device;
the optical detection device is arranged corresponding to the ink-jet head and used for sending an optical detection signal with preset intensity to the ink drop when the ink-jet head ejects the ink drop, receiving an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sending the optical feedback signal to the control device;
the control device is electrically connected with the optical detection device and used for detecting the ink jetting state of the ink jet head according to the optical feedback signal.
Optionally, the ink ejection state includes an ink ejection amount; the control device is specifically configured to obtain the intensity of the optical feedback signal, calculate an intensity difference between the intensity of the optical feedback signal and a preset standard intensity, and determine whether the intensity difference is within an allowable error range, if so, determine that the ink ejection amount of the inkjet head is normal, and if not, determine that the ink ejection amount of the inkjet head is abnormal.
Optionally, the ink ejection state includes an ink ejection rate; the control device is specifically configured to obtain a receiving time length of the optical feedback signal, calculate a time difference between the receiving time length of the optical feedback signal and a preset standard receiving time length, and determine whether the time difference is within an allowable error range, if so, determine that an ink ejection rate of the inkjet head is normal, and if not, determine that the ink ejection rate of the inkjet head is abnormal; the receiving time period includes a time period from the ejection of the ink droplet to the reception of the optical feedback signal by the optical detection device.
Optionally, the optical detection device includes:
the light emitting device is positioned on one side of the ink gun, is electrically connected with the control device and is used for sending out a light detection signal with preset intensity to the ink drop when the ink gun ejects the ink drop;
and the light receiving device is positioned on the other side of the ink gun, is opposite to the light emitting device, is electrically connected with the control device, and is used for receiving a light feedback signal formed by the light detection signal after being absorbed by the ink drop and sending the light feedback signal to the control device.
Alternatively, the inkjet head includes a plurality of nozzles arranged in a single row; the light emitting device comprises a plurality of emitting holes which correspond to the plurality of nozzles one to one, and each emitting hole is used for emitting an optical detection signal to the ink drop sprayed by the corresponding nozzle;
the light receiving device comprises a plurality of receiving probes which are in one-to-one correspondence with the plurality of emission holes, and each receiving probe is used for receiving a light feedback signal formed by the light detection signal emitted by the corresponding emission hole after being absorbed by the ink drop;
and a connecting line between each emission hole and the corresponding receiving probe is intersected with the preset ink jet track of the corresponding nozzle.
The embodiment of the application also provides an ink jetting state detection method of the ink jet head, which is applied to the ink jetting state detection system of the ink jet head, wherein the detection system comprises an optical detection device and a control device electrically connected with the optical detection device;
the detection method comprises the following steps:
the optical detection device sends out an optical detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop, receives an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sends the optical feedback signal to the control device;
the control device detects the ink jetting state of the ink jet head according to the optical feedback signal.
Optionally, the ink ejection state includes an ink ejection amount; the detecting the ink-jetting state of the ink-jet head according to the optical feedback signal comprises the following steps:
acquiring the intensity of the optical feedback signal and a preset standard intensity;
calculating an intensity difference value between the intensity of the optical feedback signal and the preset standard intensity;
judging whether the intensity difference value is within an allowable error range:
if yes, judging that the ink jet amount of the ink jet head is normal;
if not, judging that the ink jet amount of the ink jet head is abnormal.
Optionally, the ink ejection state includes an ink ejection rate; the detecting the ink-jetting state of the ink-jet head according to the optical feedback signal comprises the following steps:
acquiring the receiving time length of the optical feedback signal and a preset standard receiving time length;
calculating a time difference value between the receiving time length of the optical feedback signal and the preset standard receiving time length;
judging whether the time difference value is within an allowable error range;
if yes, judging that the ink jet speed of the ink jet head is normal;
if not, judging that the ink jet speed of the ink jet head is abnormal.
Optionally, the control device is further electrically connected with the inkjet head; the detection method further comprises the following steps:
when the control device detects the ink gun with the abnormal ink jetting state, the control device acquires the position information of the ink gun with the abnormal ink jetting state, and corrects and adjusts the corresponding ink gun according to the position information.
Optionally, the optical detection device includes a light emitting device and a light receiving device, the light emitting device and the light receiving device are oppositely disposed on two sides of the ink jet head, and are both electrically connected to the control device;
the optical detection device sends out an optical detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop, receives an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sends the optical feedback signal to the control device, and the optical detection device comprises the following steps:
the light emitting device sends out a light detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop;
and the light receiving device receives a light feedback signal formed by the light detection signal after being absorbed by the ink drop and sends the light feedback signal to the control device.
The beneficial effect of this application does: in the process of ink-jet printing, an optical detection device is arranged corresponding to the ink-jet head, an ink drop sprayed out of the ink-jet head is sent with a light detection signal with preset intensity through the optical detection device, the light feedback signal after the light detection signal is absorbed by the ink drop is received, and the light feedback signal is sent to a control device, so that the control device can obtain the light feedback signals corresponding to different ink drops in real time in the process of ink-jet printing, and monitor the ink-jet state of the ink-jet head according to the light feedback signal, so that the abnormal ink-jet head in the ink-jet state can be corrected and adjusted in time, and the working efficiency and the printing quality of.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating an inkjet status detecting system of an inkjet head according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an inkjet status detecting system of an inkjet head according to an embodiment of the present disclosure;
FIG. 3 is a schematic bottom view of an inkjet head according to an embodiment of the present disclosure;
fig. 4 is a schematic side view of a light receiving device according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart illustrating a method for detecting an ink ejection status of an inkjet head according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of zero point calibration of an ink jetting state detection system of an ink jet head according to an embodiment of the present application.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present application. This application may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The present application is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, the present embodiment provides an ink ejection state detection system 1 of an inkjet head, the ink ejection state detection system 1 including an optical detection device 2 and a control device 3; the optical detection device 2 is arranged corresponding to the ink-jet head 4, and is used for sending a light detection signal 6 with preset intensity to the ink drop 5 when the ink-jet head 4 ejects the ink drop 5, receiving a light feedback signal 7 formed after the light detection signal 6 is absorbed by the ink drop 5, and sending the light feedback signal 7 to the control device 3; the control device 3 is electrically connected with the optical detection device 2 and is used for detecting the ink ejection state of the ink-jet head 4 according to the optical feedback signal 7.
Specifically, in the inkjet printing process, when the position of the inkjet head 4 changes, the position of the optical detection device 2 also changes correspondingly, and the optical detection device 2 always maintains the position corresponding to the position of the inkjet head 4; and the optical detection device 2 continuously sends the optical detection signal 6 to a fixed position on a preset ink jet track 13 of the ink jet head 4, so that each ink drop 5 ejected by the ink jet head 4 can be irradiated by the optical detection signal 6 when falling to the fixed position; the photodetection signal 6 includes a laser detection signal or a radiation detection signal.
In this embodiment, during the ink-jet printing process, the optical detection device 2 is disposed corresponding to the ink-jet head 4, the ink droplets 5 ejected by the ink jet head 4 are sent out a photo detection signal 6 of a preset intensity by the optical detection device 2, and receives an optical feedback signal 7 formed by the optical detection signal 6 absorbed by the ink drop 5, and sends the optical feedback signal 7 to the control device 3, the control device 3 can acquire the optical feedback signals 7 corresponding to different ink drops 5 in real time during the ink jet printing process (including the intensity of the optical feedback signals 7 and the receiving time of the optical feedback signals 7), and the control device 3 can determine whether the ink ejection state (including the ink ejection amount and the ink ejection rate) of the corresponding ink-jet head 4 is abnormal according to whether the optical feedback signal 7 is abnormal, so as to correct and adjust the abnormal ink jet head 4 in time to improve the printing efficiency and the printing quality of the ink jet head.
Optionally, the ink jetting state includes an ink jetting amount; the control device 3 is specifically configured to obtain the intensity of the optical feedback signal 7, calculate an intensity difference between the intensity of the optical feedback signal 7 and a preset standard intensity, and determine whether the intensity difference is within an allowable error range, if so, determine that the ink ejection amount of the inkjet head 4 is normal, and if not, determine that the ink ejection amount of the inkjet head 4 is abnormal.
Specifically, the optical detection device 2 receives the optical feedback signal 7 and detects the intensity of the optical feedback signal 7, and sends the intensity of the optical feedback signal 7 to the control device 3. The preset standard intensity is obtained by detecting a standard inkjet head in which the ink ejection state is normal by the same optical detection device 2 under the same measurement conditions.
In this embodiment, when the light detection signal 6 with the preset intensity passes through the ink droplet 5, the ink droplet 5 may absorb the light detection signal 6 with a certain intensity, so that the intensity of the formed light feedback signal 7 is smaller than the preset intensity of the light detection signal 6, specifically, the larger the volume of the ink droplet 5 is, the larger the intensity of the absorbed light detection signal 6 is, so that the intensity difference between the preset intensity of the light detection signal 6 and the intensity of the corresponding light feedback signal 7 is in direct proportion to the size of the corresponding ink droplet 5, and therefore the control device 3 may monitor whether the ink ejection amount of the corresponding ink jet head 4 is normal or not according to the intensity of the light feedback signal 7 in the whole ink jet printing process.
Optionally, the ink jetting state further includes an ink jetting speed; the control device 3 is further specifically configured to obtain a receiving time length of the optical feedback signal 7, calculate a time difference between the receiving time length of the optical feedback signal 7 and a preset standard receiving time length, and determine whether the time difference is within an allowable error range, if so, determine that the ink ejection rate of the inkjet head 4 is normal, and if not, determine that the ink ejection rate of the inkjet head 4 is abnormal.
Specifically, the optical detection device 2 receives the optical feedback signal 7 and calculates a receiving time period of the optical feedback signal 7, and sends the receiving time period of the optical feedback signal 7 to the control device 3. The reception period of the optical feedback signal 7 includes a period from the ejection of the ink droplet 5 to the reception of the optical feedback signal 7 corresponding to the ink droplet 5 by the optical detection device 2. The preset standard receiving time period is also obtained by detecting a standard inkjet head in which the ink ejection state is normal by the same optical detection device 2 under the same measurement conditions.
In this embodiment, the faster the ink jet head 4 ejects the ink droplets 5, the shorter the receiving duration of the corresponding optical feedback signal 7 is, and conversely, the slower the ink jet head 4 ejects the ink droplets 5, the longer the receiving duration of the corresponding optical feedback signal 7 is, so that the speed of the ink jet head 4 ejecting the ink droplets 5 is inversely proportional to the receiving duration of the corresponding optical feedback signal 7, and therefore the control device 3 can monitor whether the ink ejection speed of the corresponding ink jet head 4 is normal or not according to the receiving duration of the optical feedback signal 7 in the whole ink jet printing process.
Optionally, in this embodiment, the optical detection device 2 specifically includes a light emitting device 8 and a light receiving device 9; wherein, the light emitting device 8 is located at one side of the ink jet head 4, and is electrically connected with the control device 3, and is used for sending the light detection signal 6 with preset intensity to the ink drop 5 when the ink jet head 4 ejects the ink drop 5; and the light receiving device 9 is positioned on the other side of the ink-jet head 4, is arranged opposite to the light emitting device 8, is electrically connected with the control device 3, is used for receiving the light feedback signal 7 formed by absorbing the light detection signal 6 by the ink drop 5, and sends the light feedback signal 7 to the control device 3.
Specifically, the inkjet head 4 is used for performing inkjet printing on a substrate 14 fixed on an inkjet printer platform, the inkjet head 4 is located above the substrate 14, and a preset inkjet track 13 of the inkjet head 4 corresponds to a position to be printed on the substrate 14; the light emitting device 8 and the light receiving device 9 are respectively located on two sides of the substrate 14 and on two sides of the ink-jet head 4, and the light emitting device 8 and the light receiving device 9 are arranged on the machine and can correspondingly move on the ink-jet printer machine along with the movement of the ink-jet head 4.
In the embodiment of the present application, as shown in fig. 1, the light emitting device 8 may emit a light detection signal 6 in a horizontal direction to the ink droplet 5 ejected from the inkjet head 4, and the light detection signal 6 passes through the ink droplet 5 to form a light feedback signal 7 in the horizontal direction and is received by the light receiving device 9, wherein part of the light detection signal 6 is absorbed and reflected by the ink droplet 5 during the process of passing through the ink droplet 5, and the other part of the light detection signal passes through the ink droplet 5 to form the light feedback signal 7; as shown in fig. 2, the light emitting device 8 can also emit a light detection signal 6 to a position where the preset ink jet trajectory 13 of the ink jet head 4 perpendicularly intersects the substrate 14, when the ink droplet 5 ejected from the ink jet head 4 is dropped on the substrate 14, the light detection signal 6 is irradiated to the ink droplet 5, and a light feedback signal 7 formed under the reflection action of the ink droplet 5 is received by the light receiving device 9, wherein the light detection signal 6 is partially absorbed by the ink droplet 5 in the process of passing through the ink droplet 5, and the other part is reflected by the ink droplet 5 to form the light feedback signal 7; the intensity of the optical feedback signal 7 formed by the above two methods is related to the volume of the ink droplet 5, and the larger the volume of the ink droplet 5 is, the higher the intensity of the absorbed optical detection signal 6 is, and the smaller the intensity of the formed optical feedback signal 7 is, so that the above two methods can monitor the ink ejection state of the inkjet head 4, and of course, the emitting direction of the optical detection signal 6 is not limited herein.
Alternatively, as shown in fig. 3, the inkjet head 4 includes a plurality of nozzles 10 arranged in a single row (the number of nozzles shown in the figure is merely an example and does not represent a specific number); as shown in fig. 1 and 2, the light emitting device 8 includes a plurality of emitting holes 11 in one-to-one correspondence with the plurality of nozzles 10, each emitting hole 11 for emitting the light detection signal 6 to the ink droplet 5 ejected from the corresponding nozzle 10; as shown in fig. 4, the light receiving device 9 includes a plurality of receiving probes 12 corresponding to the plurality of emitting holes 11 one to one (the number of receiving probes shown in the figure is only an example, and does not represent a specific number), and each receiving probe 12 is configured to receive the optical feedback signal 7 formed by the optical detection signal 6 emitted from the corresponding emitting hole 11 after being absorbed by the ink droplet 5; a line connecting each of the emitting holes 11 and the corresponding receiving probe 12 intersects the preset ink ejection trajectory 13 of the corresponding nozzle 10.
In the embodiment of the application, each nozzle 10 corresponds to one emitting hole 11 and one receiving probe 12, so that the ink jetting state of each nozzle 10 can be detected, the position with the abnormal ink jetting state can be found more accurately, the ink jetting position with the abnormal ink jetting state can be corrected and adjusted conveniently and timely, and the printing quality can be improved.
The embodiment of the present application further provides a method for detecting an ink jetting state of an inkjet head, wherein the method is applied to an ink jetting state detection system of the inkjet head, as shown in fig. 1 and 2, the detection system 1 includes an optical detection device 2 and a control device 3 electrically connected to the optical detection device 2; as shown in fig. 5, the detection method includes the following steps:
s501: the optical detection device sends out an optical detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop, receives an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sends the optical feedback signal to the control device;
s502: the control device detects the ink-jetting state of the ink-jet head according to the optical feedback signal.
In this embodiment, in the process of inkjet printing, the optical detection device 2 sends the optical detection signal 6 with preset intensity to the ink droplet 5 ejected from the inkjet head 4, receives the optical feedback signal 7 after the optical detection signal 6 is absorbed by the ink droplet 5, and sends the optical feedback signal 7 to the control device 3, so that the control device 3 can obtain the optical feedback signals 7 (including the intensity of the optical feedback signal 7 and the receiving duration of the optical feedback signal 7) corresponding to different ink droplets 5 in real time in the process of inkjet printing, and the control device 3 can determine whether the inkjet state (including the inkjet amount and the inkjet rate) of the corresponding inkjet head 4 is abnormal according to whether the optical feedback signal 7 is abnormal, and correct and adjust the inkjet head 4 with abnormal inkjet state in time to improve the printing efficiency and the printing quality of the inkjet print head.
Optionally, the ink jetting state includes an ink jetting amount; in step 502, detecting the ink ejection state of the inkjet head 4 according to the optical feedback signal 7 includes the following steps:
acquiring the intensity of the optical feedback signal 7 and a preset standard intensity;
calculating an intensity difference value between the intensity of the optical feedback signal 7 and a preset standard intensity;
judging whether the intensity difference is within an allowable error range:
if yes, judging that the ink jet quantity of the ink jet head 4 is normal;
if not, it is determined that the ink ejection amount of the ink jet head 4 is abnormal.
Specifically, the optical detection device 2 receives the optical feedback signal 7 and detects the intensity of the optical feedback signal 7, and sends the intensity of the optical feedback signal 7 to the control device 3. The preset standard intensity is obtained by detecting a standard inkjet head in which the ink ejection state is normal by the same optical detection device 2 under the same measurement conditions.
In this embodiment, when the light detection signal 6 with the preset intensity passes through the ink droplet 5, the ink droplet 5 may absorb the light detection signal 6 with a certain intensity, so that the intensity of the formed light feedback signal 7 is smaller than the preset intensity of the light detection signal 6, specifically, the larger the volume of the ink droplet 5 is, the larger the intensity of the absorbed light detection signal 6 is, so that the intensity difference between the preset intensity of the light detection signal 6 and the intensity of the corresponding light feedback signal 7 is in direct proportion to the size of the corresponding ink droplet 5, and therefore the control device 3 may monitor whether the ink ejection amount of the corresponding ink jet head 4 is normal or not according to the intensity of the light feedback signal 7 in the whole ink jet printing process.
Optionally, the ink jetting state further includes an ink jetting speed; in step 502, detecting the ink ejection state of the inkjet head 4 according to the optical feedback signal 7 includes the following steps:
acquiring the receiving time length of the optical feedback signal 7 and a preset standard receiving time length;
calculating a time difference value between the receiving time length of the optical feedback signal 7 and a preset standard receiving time length;
judging whether the time difference value is within an allowable error range;
if yes, judging that the ink jetting speed of the ink jet head 4 is normal;
if not, the ink jet speed of the ink jet head 4 is judged to be abnormal.
Specifically, the optical detection device 2 receives the optical feedback signal 7 and calculates a receiving time period of the optical feedback signal 7, and sends the receiving time period of the optical feedback signal 7 to the control device 3. The reception period of the optical feedback signal 7 includes a period from the ejection of the ink droplet 5 to the time at which the optical feedback signal 7 corresponding to the ink droplet 5 is received by the optical detection device 2. The preset standard receiving time period is also obtained by detecting a standard inkjet head in which the ink ejection state is normal by the same optical detection device 2 under the same measurement conditions.
In this embodiment, the faster the ink jet head 4 ejects the ink droplets 5, the shorter the receiving duration of the corresponding optical feedback signal 7 is, and conversely, the slower the ink jet head 4 ejects the ink droplets 5, the longer the receiving duration of the corresponding optical feedback signal 7 is, so that the speed of the ink jet head 4 ejecting the ink droplets 5 is inversely proportional to the receiving duration of the corresponding optical feedback signal 7, and therefore the control device 3 can monitor whether the ink ejection speed of the corresponding ink jet head 4 is normal or not according to the receiving duration of the optical feedback signal 7 in the whole ink jet printing process.
Optionally, the control device 3 is further electrically connected to the inkjet head 4; the detection method further comprises the following steps:
the control device 3 detects the inkjet head 4 with abnormal ink ejection state according to the optical feedback signal 7, acquires the position information of the inkjet head 4 with abnormal ink ejection state, and adjusts the corresponding inkjet head 4 according to the position information.
In this embodiment, the control device 3 monitors the ink-jet status of the ink-jet head 4 in real time, and when the ink-jet head 4 with abnormal ink-jet status is found, the position information of the ink-jet head 4 with abnormal ink-jet status can be obtained in time, and the corresponding ink-jet head 4 can be corrected and adjusted, so as to improve the printing quality.
Specifically, as shown in fig. 3, the inkjet head 4 includes a plurality of nozzles 10 arranged in a single row, the plurality of nozzles 10 eject ink droplets 5 simultaneously to improve printing efficiency, the optical detection device 2 sends an optical detection signal 6 to the ink droplets 5 ejected by each nozzle 10 and receives a corresponding optical feedback signal 7, so that the control device 3 can monitor the ink ejection state of each nozzle 10 in real time, when the ink ejection state is abnormal, the position of the nozzle 10 in the abnormal ink ejection state can be accurately found, and the corresponding nozzle 10 can be closed in time, other nozzles 10 can operate normally, and the position to be printed corresponding to the closed nozzle 10 can be printed by adjusting the nozzles 10 in other positions, thereby ensuring the overall printing quality.
Alternatively, as shown in fig. 1 and 2, the optical detection device 2 includes a light emitting device 8 and a light receiving device 9, and the light emitting device 8 and the light receiving device 9 are oppositely disposed on both sides of the ink-jet head 4 and are electrically connected to the control device 3; step 502 specifically includes the following steps:
the light emitting device 8 emits a light detection signal 6 of a preset intensity to the ink droplet 5 when the ink-jet head 4 ejects the ink droplet 5;
the light receiving device 9 receives the optical feedback signal 7 formed by the absorption of the optical detection signal 6 by the ink droplet 5, and sends the optical feedback signal 7 to the control device 3.
In the embodiment of the present application, as shown in fig. 1, the light emitting device 8 may emit a light detection signal 6 in a horizontal direction to the ink droplet 5 ejected from the inkjet head 4, and the light detection signal 6 passes through the ink droplet 5 to form a light feedback signal 7 in the horizontal direction and is received by the light receiving device 9, wherein part of the light detection signal 6 is absorbed and reflected by the ink droplet 5 during the process of passing through the ink droplet 5, and the other part of the light detection signal passes through the ink droplet 5 to form the light feedback signal 7; as shown in fig. 2, the light emitting device 8 can also emit a light detection signal 6 to a position where the preset ink jet trajectory 13 of the ink jet head 4 perpendicularly intersects the substrate 14, when the ink droplet 5 ejected from the ink jet head 4 is dropped on the substrate 14, the light detection signal 6 is irradiated to the ink droplet 5, and a light feedback signal 7 formed under the reflection action of the ink droplet 5 is received by the light receiving device 9, wherein the light detection signal 6 is partially absorbed by the ink droplet 5 in the process of passing through the ink droplet 5, and the other part is reflected by the ink droplet 5 to form the light feedback signal 7; the intensity of the optical feedback signal 7 formed by the above two methods is related to the volume of the ink droplet 5, and the larger the volume of the ink droplet 5 is, the higher the intensity of the absorbed optical detection signal 6 is, and the smaller the intensity of the formed optical feedback signal 7 is, so that the above two methods can monitor the ink ejection state of the inkjet head 4, and of course, the emitting direction of the optical detection signal 6 is not limited herein.
Alternatively, as shown in fig. 6, when the light emitting device 8 monitors the inkjet head 4 by emitting the light detection signal 6 to a position where the preset ink ejection trajectory 13 of the inkjet head 4 perpendicularly intersects the substrate 14, the following steps are further included before step S501:
before the ink jet head 4 ejects ink drops, the optical detection device 2 sends out an optical detection signal 6 with preset intensity to a position (to-be-printed area) where a preset ink jet track 13 of the ink jet head 4 is vertically intersected with the substrate 14, receives an optical feedback signal 7 formed by the optical detection signal 6 after being reflected by the substrate 14, and sends the intensity of the optical feedback signal 7 to the control device 3;
the control device 3 takes the intensity of the obtained optical feedback signal 7 as an initial intensity to correct the intensity of the optical feedback signal 7 obtained by the control device 3 during the ink ejection process of the ink-jet head 4.
In this embodiment, when the light emitting device 8 emits the light detection signal 6 to the position where the preset ink ejection track 13 of the ink jet head 4 perpendicularly intersects the substrate 14, part of the light detection signal 6 will be absorbed by the substrate, so that zero point correction needs to be performed on the optical detection system 1 before the ink jet head 4 starts to eject ink, that is, the initial intensity of the optical feedback signal 7 obtained by the control device 3 before the ink jet head 4 ejects ink droplets is adopted to correct the intensity of the optical feedback signal 7 obtained by the control device 3 during the ink ejection process of the ink jet head 4, so as to eliminate system errors and avoid that the judgment of the ink ejection state result is affected due to the large intensity deviation of the detected optical feedback signal 7 during the ink ejection printing process.
In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.
Claims (5)
1. An ink-ejecting state detection system of an ink-jet head is characterized by comprising an optical detection device and a control device;
the optical detection device is arranged corresponding to the ink gun and is used for continuously sending a light detection signal with preset intensity to each ink drop when the ink gun ejects the ink drop in the ink-jet printing process, receiving a light feedback signal formed by the light detection signal after the light detection signal is absorbed by the corresponding ink drop and sending the light feedback signal to the control device;
the control device is electrically connected with the optical detection device and the ink gun and is used for detecting the ink jetting state of the ink gun in real time according to the optical feedback signal and correcting and adjusting the ink gun with abnormal ink jetting state in time;
wherein the ink ejection state includes an ink ejection rate;
the control device is specifically configured to obtain a receiving time length of the optical feedback signal, calculate a time difference between the receiving time length of the optical feedback signal and a preset standard receiving time length, and determine whether the time difference is within an allowable error range, if so, determine that an ink ejection rate of the inkjet head is normal, and if not, determine that the ink ejection rate of the inkjet head is abnormal; the receiving time period includes a time period from the ejection of the ink droplet to the reception of the optical feedback signal by the optical detection device.
2. The ink ejection state detection system of an ink jet head according to claim 1, wherein the optical detection device comprises:
the light emitting device is positioned on one side of the ink gun, is electrically connected with the control device and is used for sending out a light detection signal with preset intensity to the ink drop when the ink gun ejects the ink drop;
and the light receiving device is positioned on the other side of the ink gun, is opposite to the light emitting device, is electrically connected with the control device, and is used for receiving a light feedback signal formed by the light detection signal after being absorbed by the ink drop and sending the light feedback signal to the control device.
3. The ink ejection state detection system of an ink jet head according to claim 2, wherein the ink jet head includes a plurality of nozzles arranged in a single row; the light emitting device comprises a plurality of emitting holes which correspond to the plurality of nozzles one to one, and each emitting hole is used for emitting an optical detection signal to the ink drop sprayed by the corresponding nozzle;
the light receiving device comprises a plurality of receiving probes which are in one-to-one correspondence with the plurality of emission holes, and each receiving probe is used for receiving a light feedback signal formed by the light detection signal emitted by the corresponding emission hole after being absorbed by the ink drop;
and a connecting line between each emission hole and the corresponding receiving probe is intersected with the preset ink jet track of the corresponding nozzle.
4. A method for detecting an ink ejection state of an ink jet head, the method being applied to the ink ejection state detecting system of the ink jet head according to any one of claims 1 to 3, the detecting system comprising an optical detecting device and a control device electrically connected to the optical detecting device;
the detection method comprises the following steps:
the optical detection device continuously sends out optical detection signals with preset intensity to each ink drop when the ink jet head ejects the ink drop in the ink jet printing process, receives optical feedback signals formed by the optical detection signals after the optical detection signals are absorbed by the corresponding ink drops, and sends the optical feedback signals to the control device;
the control device detects the ink-jetting state of the ink-jet head in real time according to the optical feedback signal;
the control device is also electrically connected with the ink gun;
the detection method further comprises the following steps:
when detecting the ink gun with abnormal ink jetting state, the control device acquires the position information of the ink gun with abnormal ink jetting state, and corrects and adjusts the corresponding ink gun according to the position information;
wherein the ink ejection state includes an ink ejection rate;
the detecting the ink-jetting state of the ink-jet head according to the optical feedback signal comprises the following steps:
acquiring the receiving time length of the optical feedback signal and a preset standard receiving time length;
calculating a time difference value between the receiving time length of the optical feedback signal and the preset standard receiving time length;
judging whether the time difference value is within an allowable error range;
if yes, judging that the ink jet speed of the ink jet head is normal;
if not, judging that the ink jet speed of the ink jet head is abnormal.
5. The method for detecting an ink ejection state of an ink jet head according to claim 4, wherein said optical detection means includes a light emitting device and a light receiving device, said light emitting device and said light receiving device being disposed opposite to each other on both sides of said ink jet head and both being electrically connected to said control means;
the optical detection device sends out an optical detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop, receives an optical feedback signal formed by the optical detection signal after the ink drop is absorbed, and sends the optical feedback signal to the control device, and the optical detection device comprises the following steps:
the light emitting device sends out a light detection signal with preset intensity to the ink drop when the ink jet head ejects the ink drop;
and the light receiving device receives a light feedback signal formed by the light detection signal after being absorbed by the ink drop and sends the light feedback signal to the control device.
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