CN111332028A - Heating point detection circuit and method of printing head and printer - Google Patents
Heating point detection circuit and method of printing head and printer Download PDFInfo
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- CN111332028A CN111332028A CN202010192078.3A CN202010192078A CN111332028A CN 111332028 A CN111332028 A CN 111332028A CN 202010192078 A CN202010192078 A CN 202010192078A CN 111332028 A CN111332028 A CN 111332028A
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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
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
- B41J2/3558—Voltage control or determination
Abstract
The invention provides a heating point detection circuit and method of a printing head and a printer, wherein the detection circuit comprises: the device comprises a voltage division loop, a switch loop and a heating point detection loop; the switch loop is used for connecting the voltage division loop and the heating point detection loop according to a pulse signal of the controller; the voltage division loop is used for sharing the voltage drop of the reference voltage on the heating point of the heating point detection loop, feeding the voltage of the heating point back to the controller and comparing the voltage with a preset voltage to generate a comparison result; and the heating point detection loop is used for receiving the strobe pulse sent by the controller according to the comparison result and determining the detection starting period of the next heating point according to the strobe pulse, when the heating point is judged to be the normal heating point according to the comparison result, the next heating point is detected by adopting the first starting period, otherwise, the second starting period is adopted, and the first starting period is shorter than the second starting period. Based on the invention, the problems that the detection of a single heating point on the printing head takes long time and the detection of all the dead points is long are solved.
Description
Technical Field
The invention relates to the field of detection circuits, in particular to a heating point detection circuit and method of a printing head and a printer.
Background
The thermal printing head has the possibility of burning out heating points, the burning out of the heating points can cause the loss of printing contents, and printed samples have white lines and the like. If the number of bad dots is large, the printing effect is not ideal and even the printing content cannot be identified, so that the number of bad dots on the thermal printing head needs to be detected before printing.
The current detection scheme adopts a voltage division circuit structure to detect, and opens heating points point by point, and a control system records the actual voltage value of each point to judge whether the currently opened heating point belongs to a dead point, and the resistance value detection of each heating point needs a detection period, wherein the total time T is the number of points N x T of the thermal printing head, and T is the measurement period of a single heating point.
However, because the thermal print head has a large capacitance, the on and off of each heating point has RC charging and discharging processes, and the resistance of the heating point needs to be detected after the voltage division is stable, which greatly prolongs the measurement period of a single heating point, so that the dead pixel detection of the whole print head takes a lot of time.
Disclosure of Invention
In view of the above, the present invention provides a circuit and a method for detecting a heating point of a print head, and a printer, and aims to solve the problems that the detection of a single heating point on the print head takes a long time and the detection of all defective pixels is long.
A first embodiment of the present invention provides a heated spot detection circuit of a print head, including:
the device comprises a voltage division loop, a switch loop and a heating point detection loop;
the switch loop is used for switching on the voltage division loop and the heating point detection loop according to a pulse signal of a controller;
the voltage division loop is used for sharing voltage drop of reference voltage on a heating point of the heating point detection loop, feeding the voltage of the heating point back to the controller and comparing the voltage with preset voltage to generate a comparison result;
and the heating point detection loop is used for receiving a strobe pulse sent by the controller according to the comparison result and determining a detection starting period for the next heating point according to the strobe pulse, wherein when the heating point is judged to be a normal heating point according to the comparison result, the next heating point is detected by adopting a first starting period, and when the heating point is judged to be an abnormal heating point according to the comparison result, the next heating point is detected by adopting a second starting period, and the first starting period is shorter than the second starting period.
Preferably, the voltage dividing circuit includes: a first resistor;
the first end of the first resistor is electrically connected with a reference voltage, the second end of the first resistor is electrically connected with the input end of the switch loop, and the second end of the first resistor is electrically connected with the sampling end of the controller.
Preferably, the switching circuit includes: a first MOSFET tube;
the S pole of the first MOSFET is electrically connected with the second end of the first resistor, the G pole of the first MOSFET is electrically connected with the output end of the controller, and the D pole of the first MOSFET is electrically connected with the input end of the heating point detection circuit.
Preferably, the heating point detection circuit includes: the device comprises a capacitor, a printing head driver and a plurality of heating point units;
the D pole of the first MOSFET is electrically connected with the first end of the capacitor, the second end of the capacitor is grounded, the first end of each heating point unit is electrically connected with the first end of the capacitor, the second end of each heating point unit is grounded, the input end of the printing head driver is electrically connected with the output end of the controller, and the output end of the printing head driver is electrically connected with the control end of each heating point unit.
Preferably, the first turn-on period is a time value of a voltage change of the capacitor within the preset voltage range, and the second turn-on period is 2 times of a time constant formed by the first resistor and the capacitor.
Preferably, the heating spot unit includes: a second resistor and a second MOSFET;
the first end of the second resistor is electrically connected with the first end of the capacitor, the second end of the second resistor is electrically connected with the S pole of the second MOSFET, the G pole of the second MOSFET is electrically connected with the output end of the printing head driver, and the D pole of the second MOSFET is grounded.
Preferably, the first MOSFET tube and the second MOSFET tube are N-channel MOSFET tubes.
A second embodiment of the present invention provides a printer, including a power supply, a controller, and the heating point detection circuit of the print head as described in any one of the above embodiments, where the power supply is electrically connected to an input end of the voltage division circuit, an output end of the controller is electrically connected to a control end of the switch circuit and a control end of the heating point detection circuit, and a sampling end of the controller is electrically connected to an output end of the voltage division circuit.
The third embodiment of the invention provides a method for detecting heating points of a printing head based on the method, which comprises the following steps:
sending an enabling signal to a control end of a switch loop, enabling a voltage division loop to be connected with reference voltage, and sending a gating pulse to a heating point detection loop, wherein the heating point detection loop sequentially detects heating points on the heating point detection loop;
reading a voltage value of the current heating point, and comparing the voltage value with a preset value to generate a comparison result;
when the current heating point is judged to be normal according to the comparison result, detecting the next heating point by adopting a second starting period;
when the current heating point is judged to be abnormal according to the comparison result, detecting the next heating point by adopting a first starting period;
after all the heating points are inspected, the gate pulse is stopped from being sent to the printing head driver, and the detection result of each heating point is stored.
Based on the heating point detection circuit, the method and the printer of the printing head provided by the invention, a pulse signal is output to a switch loop through a controller, the switch loop closes and conducts a voltage division loop and a heating point detection loop, the voltage division loop shares the voltage drop of a reference voltage on the heating point of the heating point detection loop and transmits the detection result to the controller, the controller sends a strobe pulse to a printing head driver of the heating point detection loop according to the detection result, when the detection result of the last heating point is a good point, the next heating point is detected by adopting a second starting period, when the detection result of the last heating point is a bad point, the next heating point is detected by adopting the first starting period, the detection period of the next heating point is selected according to the last detection result, the waste of time cost caused by detecting all the heating points by adopting a long period is avoided, making the printer out of market competition.
Drawings
Fig. 1 is a block diagram of a heated spot detection circuit of a print head according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a hot spot detection circuit for a printhead according to the present invention;
FIG. 3 is a schematic diagram of signal time slots of a detection loop provided by the present invention;
fig. 4 is a block diagram of a method for detecting a heated spot of a print head according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The invention discloses a heating point detection circuit and method of a printing head and a printer, and aims to solve the problems that detection of a single heating point on the printing head takes long time and all dead pixels are detected for a long time.
Referring to fig. 1, a first embodiment of the present invention provides a hot spot detection circuit for a printhead, including:
a voltage division loop 1, a switch loop 3 and a heating point detection loop 4;
the switch circuit 3 is used for switching on the voltage dividing circuit 1 and the heating point detection circuit 4 according to a pulse signal of the controller 2;
the voltage division loop is used for sharing voltage drop of reference voltage on a heating point of the heating point detection loop, feeding the voltage of the heating point back to the controller and comparing the voltage with preset voltage to generate a comparison result;
the heating point detection circuit 4 is configured to receive a strobe sent by the controller 2 according to the comparison result, and determine a detection start period for a next heating point according to the strobe, where when the heating point is determined to be a normal heating point according to the comparison result, the next heating point is detected with a first start period, and when the heating point is determined to be an abnormal heating point according to the comparison result, the next heating point is detected with a second start period, where the first start period is shorter than the second start period.
It should be noted that, a first end of the switch circuit 3 is connected to an output end of the voltage dividing circuit 1, a second end is connected to an input end of the heating point detection circuit 4, and a control end is connected to an output end of the controller 2, when the switch circuit 3 receives a pulse signal, the switch circuit is closed, the voltage dividing circuit 1 and the heating point detection circuit 4 are conducted, the voltage dividing circuit 1 shares a voltage drop of a reference voltage on a heating point of the heating point detection circuit 4, and sends a detection result to the controller 2, a control end of the detection circuit is electrically connected to an output end of the controller 2, the output end of the controller 2 sends a strobe pulse to the heating point detection circuit 4 according to the detection result, an open cycle is selected to detect a next heating point, and it is avoided to use a long cycle to detect all heating points (in the prior art, the detection of each cycle is to charge a capacitor in the heating point detection circuit, and then the capacitor is discharged to a steady state to start detection), which causes waste of time cost and causes the printer to lose market competitive advantage.
Referring to fig. 2, in the present embodiment, the voltage dividing circuit 1 includes: a first resistor R1;
a first end of the first resistor R1 is electrically connected to a reference voltage, a second end of the first resistor R1 is electrically connected to the input end of the switch circuit 3, and a second end of the first resistor R1 is electrically connected to the sampling end of the controller 2.
It should be noted that the resistance of the first resistor R1 may be set to be equal to the resistance of the heating point, so as to share the voltage drop of the reference voltage at the heating point of the heating point detection circuit 4, and when the circuit is powered on, the controller 2 collects the voltage value of the first resistor R1, and compares the voltage value with a preset threshold.
In the present embodiment, the switching circuit 3 includes: a first MOSFET transistor Q1;
the S pole of the first MOSFET Q1 is electrically connected to the second end of the first resistor R1, the G pole of the first MOSFET Q1 is electrically connected to the output terminal of the controller 2, and the D pole of the first MOSFET Q1 is electrically connected to the input terminal of the hot spot detecting circuit 4.
It should be noted that the G pole of the first MOSFET Q1 is configured to be connected to the output end of the controller 2, when receiving a pulse signal, the first MOSFET Q1 is turned on, the voltage dividing circuit 1 is electrically connected to the heating point detecting circuit 4, and the first resistor R1 shares the voltage drop of the reference voltage at the heating point of the heating point detecting circuit 4, and of course, in other embodiments, the switching circuit 3 may also be a field effect transistor, a GTR transistor, or an IGBT, and is configured to receive the pulse of the controller 2 and turn on the voltage dividing circuit 1 and the heating point detecting circuit 4, which is not specifically limited herein, but these schemes are within the protection scope of the present invention.
In this embodiment, the heating point detection circuit 4 includes: a capacitor C1, a head driver 41, and a plurality of heating dot cells 42;
wherein the D pole of the first MOSFET transistor Q1 is electrically connected to the first terminal of the capacitor C1, the second terminal of the capacitor C1 is grounded, the first terminal of each of the hot spot units 42 is electrically connected to the first terminal of the capacitor C1, the second terminal of each of the hot spot units 42 is grounded, the input terminal of the print head driver 41 is electrically connected to the output terminal of the controller 2, and the output terminal of the print head driver 41 is electrically connected to the control terminal of each of the hot spot units 42.
It should be noted that, during both the on and off of the heating dots, the charging and discharging processes of the capacitor C1 and the first resistor R1 are involved, and when a dead dot is detected, it is necessary to detect after the voltage division is stabilized, so that when the detection result at the previous detection point is a dead dot, it is necessary to detect the detection point with a long on period, and when the controller 2 determines that the detection result is a dead dot, it sends a strobe pulse to the head driver 41, and the head driver 41 turns on the next heating dot unit 42 with a corresponding on period.
In this embodiment, the heating point unit 42 includes: a second resistor RTPH and a second MOSFET Q2;
a first terminal of the second resistor RTPH is electrically connected to the first terminal of the capacitor C1, a second terminal of the second resistor RTPH is electrically connected to the S-pole of the second MOSFET Q2, the G-pole of the second MOSFET Q2 is electrically connected to the output terminal of the printhead driver 41, and the D-pole of the second MOSFET Q2 is grounded.
The second resistor RTPH is a heating resistor of a heating point, and when the heating point is a defective point (when the heating resistor is blown or partially blown), the resistance value is obviously larger than the normal heating point, when the first resistor R1 divides the voltage, the voltage is lower, when compared with the preset value, the voltage is obviously lower, the controller 2 will judge the heating point as the dead point, and outputs a strobe to the head driver 41, the head driver 41 turns on the next heating spot with a corresponding on-period, wherein, the second MOSFET Q2 can be integrated in the print head driver 41 and connected to the second resistor RTPH to realize one-to-one correspondence between MOSFET and heating resistor, in other embodiments, a field effect transistor, a GTR transistor, or an IGBT may be used to switch the heating resistor, which is not limited herein, but is within the scope of the present invention.
In this embodiment, the first turn-on period is a time value of a voltage variation of the capacitor within the preset voltage range, and the second turn-on period is 2 times of a time constant formed by the first resistor and the capacitor.
It should be noted that the first on period may be 10us, and the second on period may be 2R1C, but is not limited thereto;
referring to fig. 3, fig. 3 is a time slot diagram of signals, where signal 11 is an enable signal time slot of the first MOSFET, signal 12 is a strobe time slot, VT is a predetermined voltage, and signal 12 is a detected voltage.
When the current heating point is judged to be a good point (namely normal), a first starting period is adopted to detect the next heating point, the first starting period is 10us, the gating pulse of the first starting period is high level in 0-2us, the gating pulse is low level in 2-10us, the second MOSFET is switched on in the high level, the capacitor is charged, the second MOSFET is switched off in the low level, the capacitor is discharged, sampling can be carried out in 8us, if the current point is a bad point, the sampling voltage is greater than the preset voltage in 8us, if the current point is a good point, the sampling voltage is less than the preset voltage in 8us, and a next period is started in 10 us.
When the sampling voltage is greater than the preset voltage (namely when the current is a dead point), a second starting period is adopted to detect the next heating point, because the capacitor at the moment is charged to a certain value, long-time discharging to a stable state is needed, sampling is carried out again, whether the current heating point is normal is judged, and the next period is counted after 2R1C is finished, so the duration of the first starting period is shorter than the second starting period. In this embodiment, the first MOSFET Q1 and the second MOSFET Q2 may be N-channel MOSFET transistors.
It should be noted that, in other embodiments, the first MOSFET Q1 and the second MOSFET Q2 may also be P-channel MOSFET transistors, which are turned on when receiving a low-level pulse signal, and the connection relationship changes correspondingly, and these schemes may be correspondingly arranged according to actual situations, which are not specifically limited herein, but all of these schemes are within the protection scope of the present invention.
A second embodiment of the present invention provides a printer, including a power supply 5, a controller 2, and the above-mentioned heating point detection circuit of the print head, where the power supply 5 is electrically connected to an input end of the voltage division circuit 1, an output end of the controller 2 is electrically connected to a control end of the switch circuit 3 and a control end of the heating point detection circuit 4, and a sampling end of the controller 2 is electrically connected to an output end of the voltage division circuit 1.
Referring to fig. 4, a third embodiment of the present invention provides a method for detecting a heating point of a print head according to the foregoing description, including:
s101, sending an enabling signal to a control end of a switch loop, enabling a voltage division loop to be connected with a reference voltage, and sending a gating pulse to a heating point detection loop, wherein the heating point detection loop sequentially detects heating points on the heating point detection loop;
s102, reading a voltage value of the current heating point, comparing the voltage value with a preset value, and generating a comparison result;
s103, when the current heating point is judged to be normal according to the comparison result, detecting the next heating point by adopting a second starting period;
s104, when the current heating point is judged to be abnormal according to the comparison result, detecting the next heating point by adopting a first starting period;
and S105, stopping sending the strobe pulse to the printing head driver after all the heating points are detected, and storing the detection result of each heating point.
Preferably, the second turn-on period may be 10us, but is not limited thereto.
It should be noted that the capacitance C1 can be varied within a preset voltage range within 10 us.
Preferably, the first heating point is detected by using the first turn-on period.
It should be noted that, when the heating points are all good points, the detection period is as follows:
T＝2*R1*C+(N-1)*10us；
wherein, T all heating point measuring periods, 2R1C is a first opening period (twice the time constant of the first resistor R1 and the capacitor C1), 10us is a second opening period, N is the total number of heating points, and the first heating points are all detected by adopting the first opening period.
For ease of understanding, the following formula is provided, which is the measurement period when there are 5 bad spots:
T＝(5+1)*2*R1*C1+(N-6)*10us。
based on the heating point detection circuit, the method and the printer of the printing head provided by the invention, a pulse signal is output to a switch loop through a controller, the switch loop closes and conducts a voltage division loop and a heating point detection loop, the voltage division loop shares the voltage drop of a reference voltage on the heating point of the heating point detection loop and transmits the detection result to the controller, the controller sends a strobe pulse to a printing head driver of the heating point detection loop according to the detection result, when the detection result of the last heating point is a good point, the next heating point is detected by adopting a second starting period, when the detection result of the last heating point is a bad point, the next heating point is detected by adopting the first starting period, the detection period of the next heating point is selected according to the last detection result, the waste of time cost caused by detecting all the heating points by adopting a long period is avoided, making the printer out of market competition.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (9)
1. A heat spot detection circuit of a print head, comprising:
the device comprises a voltage division loop, a switch loop and a heating point detection loop;
the switch loop is used for switching on the voltage division loop and the heating point detection loop according to a pulse signal of a controller;
the voltage division loop is used for sharing voltage drop of reference voltage on a heating point of the heating point detection loop, feeding the voltage of the heating point back to the controller and comparing the voltage with preset voltage to generate a comparison result;
and the heating point detection loop is used for receiving a strobe pulse sent by the controller according to the comparison result and determining a detection starting period for the next heating point according to the strobe pulse, wherein when the heating point is judged to be a normal heating point according to the comparison result, the next heating point is detected by adopting a first starting period, and when the heating point is judged to be an abnormal heating point according to the comparison result, the next heating point is detected by adopting a second starting period, and the first starting period is shorter than the second starting period.
2. The heating point detection circuit of a printhead according to claim 1, wherein the voltage dividing circuit includes: a first resistor;
the first end of the first resistor is electrically connected with a reference voltage, the second end of the first resistor is electrically connected with the input end of the switch loop, and the second end of the first resistor is electrically connected with the sampling end of the controller.
3. The heating point detection circuit of a printhead according to claim 2, wherein the switch circuit includes: a first MOSFET tube;
the S pole of the first MOSFET is electrically connected with the second end of the first resistor, the G pole of the first MOSFET is electrically connected with the output end of the controller, and the D pole of the first MOSFET is electrically connected with the input end of the heating point detection circuit.
4. The dot detection circuit according to claim 3, wherein the dot detection circuit comprises: the device comprises a capacitor, a printing head driver and a plurality of heating point units;
the D pole of the first MOSFET is electrically connected with the first end of the capacitor, the second end of the capacitor is grounded, the first end of each heating point unit is electrically connected with the first end of the capacitor, the second end of each heating point unit is grounded, the input end of the printing head driver is electrically connected with the output end of the controller, and the output end of the printing head driver is electrically connected with the control end of each heating point unit.
5. The circuit according to claim 4, wherein the first on period is a time value of a voltage change of the capacitor within the preset voltage range, and the second on period is 2 times a time constant of the first resistor and the capacitor.
6. The dot detection circuit according to claim 4, wherein the dot unit includes: a second resistor and a second MOSFET;
the first end of the second resistor is electrically connected with the first end of the capacitor, the second end of the second resistor is electrically connected with the S pole of the second MOSFET, the G pole of the second MOSFET is electrically connected with the output end of the printing head driver, and the D pole of the second MOSFET is grounded.
7. The dot detection circuit according to claim 6, wherein the first MOSFET and the second MOSFET are N-channel MOSFET transistors.
8. A printer comprising a power supply, a controller and a hot spot detection circuit of a printhead as claimed in any one of claims 1 to 7, the power supply being electrically connected to an input of the voltage divider circuit, an output of the controller being electrically connected to a control terminal of the switch circuit and a control terminal of the hot spot detection circuit, and a sampling terminal of the controller being electrically connected to an output of the voltage divider circuit.
9. A print head heated spot detection method according to claim 8, comprising:
sending an enabling signal to a control end of a switch loop, enabling a voltage division loop to be connected with reference voltage, and sending a gating pulse to a heating point detection loop, wherein the heating point detection loop sequentially detects heating points on the heating point detection loop;
reading a voltage value of the current heating point, and comparing the voltage value with a preset value to generate a comparison result;
when the current heating point is judged to be normal according to the comparison result, detecting the next heating point by adopting a second starting period;
when the current heating point is judged to be abnormal according to the comparison result, detecting the next heating point by adopting a first starting period;
after all the heating points are inspected, the gate pulse is stopped from being sent to the printing head driver, and the detection result of each heating point is stored.
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| CN113815316A (en) * | 2020-11-26 | 2021-12-21 | 山东华菱电子股份有限公司 | Thermal printing head heating control method and device based on differential constant-current heating |
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