WO2008074247A1 - Circuit de détection et cartouche d'encre - Google Patents

Circuit de détection et cartouche d'encre Download PDF

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Publication number
WO2008074247A1
WO2008074247A1 PCT/CN2007/071088 CN2007071088W WO2008074247A1 WO 2008074247 A1 WO2008074247 A1 WO 2008074247A1 CN 2007071088 W CN2007071088 W CN 2007071088W WO 2008074247 A1 WO2008074247 A1 WO 2008074247A1
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WO
WIPO (PCT)
Prior art keywords
ink
signal
pair
circuit
ink cartridge
Prior art date
Application number
PCT/CN2007/071088
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English (en)
Chinese (zh)
Inventor
Qingguo Xiao
Xueqian Wu
Dongnin Lin
Ligong Xie
Original Assignee
Print-Rite Technology Development Co., Ltd Of Zhuhai
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Application filed by Print-Rite Technology Development Co., Ltd Of Zhuhai filed Critical Print-Rite Technology Development Co., Ltd Of Zhuhai
Publication of WO2008074247A1 publication Critical patent/WO2008074247A1/fr

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Classifications

    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17566—Ink level or ink residue control
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/243—Schematic arrangements of probes combined with measuring circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/265—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/266—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17566—Ink level or ink residue control
    • B41J2002/17579—Measuring electrical impedance for ink level indication

Definitions

  • the present invention relates to a detection circuit for detecting the presence or absence of a conductive liquid in a container, and more particularly to a detection circuit capable of detecting the presence or absence of ink in an ink cartridge and using the detection The cartridge of the circuit.
  • the present invention is based on a Chinese patent application filed on Dec. 20, 2006, filed on Jan. 20, 2006, the content of which is hereby incorporated by reference.
  • An ink cartridge is a commonly used inkjet printing consumable.
  • a general ink cartridge is provided with a detecting device for the presence or absence of ink to detect the presence or absence of ink in the ink cartridge.
  • An existing ink cartridge is a piezoelectric element or a piezoelectric sensor for detecting the presence or absence of ink in an ink cartridge.
  • the Chinese patent application No. 200480001120. 8 discloses the use of a piezoelectric element for the presence or absence of ink.
  • a device for detecting comprising: a detection signal generating circuit for charging and discharging the piezoelectric element, thereby generating a detection signal including information indicating a period, wherein the period is a predetermined standby time elapsed from the end of discharging The period of residual vibration remaining on the piezoelectric element thereafter; and a control portion for generating a clock signal and controlling charging and discharging of the piezoelectric element.
  • the period value can be used to determine if the remaining amount of consumables contained is greater than a predetermined amount.
  • the control unit determines a predetermined standby time by counting the number of pulses of the clock signal.
  • the Chinese invention patent ZL03124980. 9 and the Chinese invention patent application 200610093869. 0 disclose a detection device and method having an alternative component which is constituted by an arithmetic logic operation circuit. Since the arithmetic logic operation circuit is generally composed of a plurality of amplifiers, NAND gates, and the like, many components are used, which is not significant for reducing the complexity of the ink detecting device and reducing the cost of the ink cartridge production.
  • the Chinese invention patent ZL03158018. 1 discloses a liquid detecting circuit which is composed of an electrode, a power source impedance, an AC signal source and a determining device. Although the detecting circuit is relatively simple, it only has a power source impedance and intersection.
  • the detection circuit provided by the present invention comprises a pair of electrode pairs arranged between phases, the electrode pair is electrically connected when the electrode pair is filled with ink; the signal exchange electrode for exchanging information with the printer, and the pair of electrodes a series circuit; an alternating current signal source that generates a periodic signal; at least one capacitive element connected in series with the pair of electrodes.
  • the invention also provides an ink cartridge, comprising an ink supply chamber for accommodating ink; discharging an ink to an ink supply port outside the ink supply chamber; and a detecting circuit comprising a pair of electrode pairs arranged between the electrodes, wherein the electrode is electrically charged when the electrode pair is filled with ink Connected; a signal exchange electrode for exchanging information with the printer, which constitutes a series circuit with the pair of electrodes; an AC signal source for generating a periodic signal; at least one capacitive element connected in series with the pair of electrodes.
  • DRAWINGS 1 is a circuit diagram of a first embodiment of the present invention
  • FIG. 2 is a circuit diagram of a second embodiment of the present invention
  • FIG. 3 is a circuit diagram of a third embodiment of the present invention
  • Figure 5 is a circuit diagram of a fifth embodiment of the present invention
  • Figure 6 is a circuit diagram of a sixth embodiment of the present invention
  • Figure 7 is a schematic diagram of an equivalent circuit of the first operational state of the first embodiment of the present invention:
  • Figure 8 It is an equivalent circuit diagram of the second working state of the first embodiment of the present invention.
  • 1 is a circuit diagram of a first embodiment of the detecting circuit of the present invention.
  • an ink remaining amount detecting circuit is applied to an ink cartridge (not shown), which is composed of a probe electrode pair. 1.
  • the signal exchange electrode 2, the AC signal source 8 and the capacitor 20 are connected in series.
  • the probe electrode pair 1 is disposed in the ink supply port or the ink supply chamber in the ink cartridge.
  • the signal exchange electrode 2 maintains a signal connection with a chip (not shown) disposed on the ink cartridge.
  • the ink cartridge chip maintains a signal connection with the chip in the printer, and the information detected by the detection circuit passes through the signal exchange electrode 2 It is sent to the cartridge chip, which is then transferred to the printer by the cartridge chip, and the printer determines the presence or absence of ink in the cartridge.
  • the AC signal source 8 loads a periodically varying signal to the detection circuit.
  • the AC signal source 8 can be a passive signal source, such as a crystal oscillator, a passive signal generator, etc., or an active signal source, such as an active signal. Generator, periodic oscillation circuit or microcontroller, microcontroller (MCU), etc.
  • the function of the capacitor 20 is to mimic the operational characteristics of the piezoelectric element or the piezoelectric sensor, allowing the printer to detect the presence of a detecting device in the ink cartridge.
  • the main component of the piezoelectric element or the piezoelectric sensor is a piezoelectric crystal, the presence of the detecting piezoelectric element or the piezoelectric sensor actually detects the presence of the piezoelectric crystal.
  • the piezoelectric crystal has a charge and discharge characteristic similar to that of the capacitor, and the printer determines whether or not the piezoelectric crystal exists by detecting the charge and discharge characteristics of the piezoelectric crystal.
  • the printer determines whether there is a piezoelectric element or a piezoelectric sensor in the detection circuit.
  • the printer determines whether there is a periodic signal in the detecting circuit, if there is a period The sex signal, the printer determines whether the oscillation frequency of the periodic signal is consistent with the frequency set by the printer, and thereby determines whether the detection device is correct or not.
  • the printer After the above two detections and judgments, if the printer believes that the detection circuit has the presence of a piezoelectric element or a piezoelectric sensor, and the oscillation frequency coincides with the frequency set by the printer, the printer considers that the detection device in the ink cartridge is correct, and then Determine if the amount of ink in the cartridge is sufficient.
  • the detecting circuit of the embodiment After the detecting circuit of the embodiment is mounted on the ink cartridge, if there is sufficient ink in the ink cartridge, the two electrodes of the probe electrode pair 1 are electrically connected, and the equivalent circuit diagram thereof is as shown in the figure. 7 is shown.
  • the detection circuit is in an on state, and the printer is connected to the signal exchange electrode 2 through a corresponding electrode, and detects whether the circuit has a piezoelectric element or a piezoelectric sensor.
  • the capacitor 20 is repeatedly charged and discharged under the action of the periodic signal generated by the AC signal source 8, and the printer detects that the detection circuit has a charge and discharge similar to that of the piezoelectric crystal.
  • the characteristic component exists, and it is considered that there is a piezoelectric element or a piezoelectric sensor in the detection circuit, and the next step is entered. ⁇ detection.
  • the periodic signal generated by the AC signal source 8 is transmitted to the printer through the signal exchange electrode 2, and the printer determines whether the oscillation frequency of the periodic signal coincides with the set frequency. Since the oscillation frequency of the periodic signal generated by the AC signal source 8 can be set within the range of 10k-200kHz, and can be adjusted according to the frequency set by the printer, the printer can detect the same value as the set value according to the actual situation. The oscillation frequency, therefore, the printer will consider the presence of a piezoelectric element or a piezoelectric sensor in the detection circuit, and its oscillation frequency is consistent with the frequency set by the printer, so that the detection device in the ink cartridge is considered correct and can correctly detect the ink cartridge. The presence or absence of ink.
  • the printer detects whether the remaining amount of ink in the ink cartridge is sufficient by the detecting device in the ink cartridge.
  • the probe electrode pair 1 is electrically connected, the detection circuit is also turned on at the same time, the signal exchange electrode 2 has a voltage signal output, and the printer detects the output voltage signal through the corresponding electrode, and the printer believes that there is Ink, the printer can be used normally.
  • the ink in the ink cartridge is consumed, the ink between the probe electrode pairs 1 is depleted, and the electrical connection between the two electrodes of the probe electrode pair 1 is lost.
  • the equivalent circuit diagram is as shown in FIG.
  • Figure 2 discloses a second embodiment of the invention. Compared with the first embodiment shown in FIG. 1, the loop inductor 4 and the coupled inductor 5 are used in FIG. 2 to form a coupling element, which couples the periodic signal generated by the AC signal source 8 into the detecting circuit, thereby reducing The effect of the AC signal source 8 on the detection circuit when it is directly connected in series to the detection circuit.
  • a resistor 10 with adjustable resistance value is connected in series in the detection circuit, and the adjustable resistor can be Adjust according to different ink resistance.
  • the detecting circuit is composed of a resonant circuit and an alternating current signal input circuit, wherein the resonant circuit is composed of a probe electrode pair 1, a signal exchange electrode 2, a loop inductor 4, a resistor 10 and a capacitor 20 in series, and the AC signal input loop is composed of The AC signal source 8 is formed in series with the coupled inductor 5.
  • the coupled inductor 5 and the loop inductor 4 constitute the coupling portion of the present embodiment.
  • the present embodiment couples the periodic signal generated by the alternating current signal source 8 into the resonant circuit through the coupling element.
  • a resistor 10 with adjustable resistance is connected in series.
  • exploration The pin electrode pair 1 is also disposed in the ink supply port in the ink cartridge or in the ink supply chamber in the ink cartridge. When the probe electrode pair 1 is filled with ink between the electrodes, the electrode pair is electrically connected.
  • the handshake electrode 2 is connected to the printer signal and exchanges information with the printer.
  • the AC signal source 8 can be an active signal source or a passive signal source, and the generated periodic signal is applied to the coupled inductor 5, and the loop inductor 4 disposed in the resonant loop receives the AC signal through the inductive coupling with the coupled inductor 5.
  • the resistor 10 interacts with the capacitor 20 and mimics the operational characteristics of the piezoelectric sensor, so that the printer detects the presence of the detecting device. This process is the same as that of the first embodiment described above, and will not be described herein.
  • the resistance value of the resistor 10 ranges from 0 to 10 ⁇ , which can be set according to the properties of different inks. When the ink resistance is large, the resistor 10 with a small resistance value can be selected.
  • the larger resistor 10 is chosen to block the detection of different types of ink.
  • the detecting circuit of the embodiment is mounted on the ink cartridge, if there is enough ink in the ink cartridge, the two electrodes of the probe electrode pair 1 are electrically connected, the resonant circuit is turned on, and the printer exchanges signals through the corresponding electrodes.
  • the electrode 2 is electrically connected and detects whether the circuit has the presence of a piezoelectric element or a piezoelectric sensor.
  • the printer detects that there is a component having a charge and discharge characteristic in the resonant circuit, and it is considered that there is a piezoelectric element or a piezoelectric sensor in the detecting circuit, and the detection of the next turn is performed.
  • the printer determines whether the vibration frequency of the piezoelectric element or the piezoelectric sensor in the detection circuit is consistent with the frequency set by the printer, the periodic signal generated by the AC signal source 8 is coupled to the loop inductance 4 through the coupling inductor 5, the loop After receiving the periodic signal, the inductor 4 forms the same resonant frequency as the periodic signal, and the frequency is also formed on the signal exchange electrode 2.
  • the printer After the printer detects the periodic signal, it determines the oscillation. Whether the frequency is consistent with the set frequency. Since the vibration frequency of the periodic signal generated by the signal source is adjustable, the printer can detect the oscillation frequency that is consistent with the set value, and the printer considers that the oscillation frequency is consistent with the frequency set by the printer, so that the detection device in the ink cartridge is considered correct and It can correctly detect the presence or absence of ink in the ink cartridge.
  • the probe electrode pair 1 is electrically connected and the resonant circuit is turned on, the signal exchange electrode 2 has a voltage signal output, and the printer considers that there is ink in the ink cartridge; if the probe electrode pair The ink between 1 is exhausted, the electrode of the probe electrode pair 1 loses electrical connection, the resonant circuit is disconnected, and the signal exchange electrode 2 has no voltage output. The printer thinks that the ink in the ink cartridge is about to run out, and issues a warning to the user. signal.
  • the probe electrode pair 1 is disposed between the signal exchange electrode 2 and the loop inductor 4. In practical applications, the probe electrode pair 1 may also be disposed between the resistor 10 and the capacitor 20.
  • the coupling portion is not limited to the inductive coupling element used in the embodiment, and FIG. 3 is the third embodiment of the embodiment, and the coupling portion used is a photoelectric coupling element.
  • the coupling portion in this embodiment is composed of a light-emitting member which is a light-emitting diode 6, and a light-receiving member which is a phototransistor 7.
  • the other components are the same as those of the second embodiment, and are not described herein.
  • the AC signal source 8 transmits a periodic signal to the light-emitting diode 6 of the coupling portion
  • the light-emitting diode 6 emits or extinguishes with the presence or absence of the periodic signal voltage.
  • the phototransistor 7 generates a current by receiving light emitted from the light emitting diode 6. Since the light-emitting diode 6 is illuminated or extinguished as the periodic signal changes, the current generated by the phototransistor 7 is also periodically interrupted.
  • the luminous intensity of the light emitting diode 6 is also increased or decreased with the absolute value of the signal.
  • the phototransistor 7 generates a periodically varying current according to the intensity of the light intensity, and the magnitude of the current value changes according to the change of the light intensity emitted by the illuminating secondary light 6, that is, the phototransistor 7 is generated.
  • the current is varied according to the change of the absolute value of the continuously changing periodic signal, and the frequency of change can be substantially consistent.
  • the current signal generated by the phototransistor 7 forms a voltage signal when flowing through the resistor 10, and the voltage signal is also a periodically varying signal and maintains a constant frequency of change with the periodic signal generated by the AC signal source 8.
  • the periodically varying voltage signal can be transmitted to the printer via the signal exchange electrode 2 and the corresponding electrode, and the printer detects the oscillation frequency of the resonant circuit and determines whether the detection device in the ink cartridge is correct.
  • the printer detects and judges whether the detecting device in the ink cartridge is correct by the same manner and process as the first and second embodiments described above, and confirms the detection.
  • the coupling portion may be capacitive coupling in addition to inductive coupling and photoelectric coupling, and the working principle is basically the same as the above two embodiments, except that the capacitive coupling component is used in the coupling portion, and the AC signal source 8 is used.
  • a periodic signal is sent to the coupling capacitor, which couples the signal into the loop capacitor, turns the resonant loop on, and determines the presence or absence of ink in the cartridge.
  • FIG. 4 discloses a fourth embodiment of the present invention.
  • a capacitive component can be connected in parallel with the branch of the resistor 10 and the capacitor 20 to convert the DC signal component in the loop. Filtered.
  • the difference from the second embodiment is that a filter capacitor 21 is connected in parallel with the branch formed by the resistor 10 and the capacitor 20.
  • the filter capacitor 21 can be lpF-800pF, and the function is that Filtering the DC signal component in the resonant tank.
  • the reason for using the filter capacitor 21 is as follows: In the process of determining the presence or absence of ink in the ink cartridge by the detecting circuit, the resonant circuit may be affected by the detection signal and the coupling component transmitted by the printer. With a certain DC signal component. The DC signal component will have a certain influence on whether the oscillation frequency of the piezoelectric element or the piezoelectric sensor in the ink cartridge is consistent with the set frequency, and the printer may mistake the oscillation frequency of the piezoelectric element or the piezoelectric sensor. If the fixed frequencies are inconsistent, the ink remaining amount cannot be detected normally.
  • the filter capacitor 21 After the filter capacitor 21 is used, if a DC signal component exists in the resonant tank, when it flows through the parallel branch composed of the resistor 10, the capacitor 20 and the filter capacitor 21, the DC signal component is filtered by the filter capacitor 21. This is because when the DC signal passes through the filter capacitor 21, since the DC signal has no change in direction, the amount of electricity formed will only stay on one plate of the capacitor 21 and cannot reach the other plate of the filter capacitor 21, that is, It is said that the DC signal cannot pass through the filter capacitor 21, so that the filter capacitor 21 can filter the DC signal component in the loop to prevent it from being mixed into the AC signal component in the resonant loop, thereby preventing the printer from erroneously thinking that the detecting device is not correct.
  • a plurality of branches composed of a resistor and a capacitor in series may be disposed in the detecting circuit.
  • FIG. 5 it is a fifth embodiment of the present invention.
  • a branch composed of a resistor 12 and a capacitor 22 is connected in parallel with the branch formed by the resistor 10 and the capacitor 20.
  • the characteristics of the circuit shown in Fig. 5 are closer to the charge and discharge characteristics of the piezoelectric crystal.
  • the detection circuit When the printer detects the presence of a piezoelectric element or a piezoelectric sensor, the detection circuit can exhibit a charge and discharge characteristic closer to that of the piezoelectric crystal, making it easier for the printer to consider the presence of a piezoelectric element or a piezoelectric sensor in the detection circuit, thereby Enter the next judgment.
  • the number of parallel connections can be more.
  • a total of three branches consisting of a resistor and a capacitor are a resistor 10, a first branch composed of a capacitor 20, a resistor 13a, a second branch composed of a capacitor 23a, and a resistor. 13b, a second branch composed of a capacitor 23b.
  • the coupling portions are all inductive coupling, but in the practical application of the present invention, a photoelectric coupling element, a capacitive coupling element or the like may be used as the coupling portion.
  • the detection circuit provided by the invention is simple, can reduce the complexity of producing the ink detecting device, and can reduce the production cost of the ink cartridge, and the detecting circuit can well imitate the working characteristics of the piezoelectric element or the piezoelectric sensor, and can make the printer correctly judge. Is the ink level in the ink cartridge sufficient?

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Ink Jet (AREA)

Abstract

L'invention concerne un circuit de détection et une cartouche d'encre. Le circuit de détection est composé d'un couple d'électrodes (1), d'une électrode échangeuse de signaux (2), d'une source de signaux de courant alternatif (8) et au moins d'un condensateur (20) branché en série avec le couple d'électrodes. Ce circuit de détection présente une structure simple et met en application un nombre limité d'éléments. On peut donc le fabriquer au moyen d'un procédé de fabrication simplifié et à des coûts de production limités. Ce circuit ne se détériore pas facilement et peut simuler les caractéristiques de fonctionnement d'un élément piézo-électrique.
PCT/CN2007/071088 2006-12-20 2007-11-19 Circuit de détection et cartouche d'encre WO2008074247A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610124397.0 2006-12-20
CNB2006101243970A CN100486812C (zh) 2006-12-20 2006-12-20 检测电路及墨盒

Publications (1)

Publication Number Publication Date
WO2008074247A1 true WO2008074247A1 (fr) 2008-06-26

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CN (1) CN100486812C (fr)
WO (1) WO2008074247A1 (fr)

Cited By (1)

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CN109297562A (zh) * 2018-11-12 2019-02-01 淮南矿业(集团)有限责任公司 一种声光水位测量仪及测量方法

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JP2013003088A (ja) * 2011-06-21 2013-01-07 Aisan Ind Co Ltd 液体センサ
CN102950906B (zh) * 2012-01-10 2016-03-30 珠海艾派克微电子有限公司 墨盒墨量提示方法、墨盒芯片和墨盒
EP3118591B1 (fr) * 2015-07-15 2018-09-12 VEGA Grieshaber KG Appareil de mesure de niveau de remplissage
US9789697B1 (en) * 2016-07-27 2017-10-17 Xerox Corporation Fluid level sensor with combined capacitance and conductance
CN108931283B (zh) * 2017-05-22 2021-01-08 九阳股份有限公司 一种水槽的水位检测方法和装置

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JPS5670416A (en) * 1979-11-15 1981-06-12 Fuji Electric Co Ltd Switching device for detecting level of liquid
JPH01304950A (ja) * 1988-06-02 1989-12-08 Canon Inc 液量検出装置
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CN1488509A (zh) * 2002-07-24 2004-04-14 ���ṫ˾ 液体检测装置、液体量检测装置及其检测方法
US6874861B2 (en) * 2003-04-29 2005-04-05 Hewlett-Packard Development Company, L.P. Printing device having a printing fluid detection system
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CN109297562A (zh) * 2018-11-12 2019-02-01 淮南矿业(集团)有限责任公司 一种声光水位测量仪及测量方法
CN109297562B (zh) * 2018-11-12 2024-03-12 淮南矿业(集团)有限责任公司 一种声光水位测量仪及测量方法

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