This disclosure relates to ink jet printing.
Inkjet printers are one type of apparatus employing droplet ejection devices. In one type of inkjet printer, ink drops are delivered from a plurality of linear inkjet print head devices oriented perpendicular to the direction of travel of the substrate being printed. Each print head device includes a plurality of droplet ejection devices formed in a monolithic body that defines a plurality of pumping chambers (one for each individual droplet ejection device) in an upper surface and has a flat piezoelectric actuator covering each pumping chamber. Each individual droplet ejection device is activated by a voltage pulse to the piezoelectric actuator that distorts the shape of the piezoelectric actuator and discharges a droplet at the desired time in synchronism with the movement of the substrate past the print head device.
Each individual droplet ejection device is independently addressable and can be activated on demand in proper timing with the other droplet ejection devices to generate an image. Printing occurs in print cycles. In each print cycle, a fire pulse (e.g., 10-150 volts) is applied to all of the droplet ejection devices at the same time, and enabling signals are sent to only the individual droplet ejection devices that are to jet ink in that print cycle.
In general, in one aspect, the invention features a method of driving an inkjet module having a plurality of ink jets. The method includes applying a voltage waveform to the inkjet module, the voltage waveform including a first pulse and a second pulse, activating one or more of the ink jets contemporaneously to applying the first pulse, wherein each activated ink jet ejects a fluid droplet in response to the first pulse, and activating all of the ink jets contemporaneously to applying the second pulse without ejecting a droplet.
Embodiments of this aspect of the invention may include one or more of the following features. Each ink jet comprises a piezoelectric transducer. Activating an ink jet causes the voltage waveform to be applied to the piezoelectric transducer for that ink jet. Activating all of the ink jets contemporaneously causes a fluid meniscus in each ink jet to move in response to the second pulse without ejecting a droplet.
The method may further include applying additional voltage waveforms to the inkjet module, the voltage waveforms being applied with a frequency of about 2 kHz or more. The first pulse has a first period and the second pulse has a second period less than the first period. The first pulse has a first amplitude and the second pulse has a second amplitude less than the first amplitude.
In another aspect of the invention, a method of driving an inkjet module having a plurality of ink jets comprises applying a voltage waveform to an ink jet in the inkjet module each period in a jetting cycle, wherein each cycle the voltage waveform comprises a first pulse or a second pulse. The first pulse causes the ink jet to eject a fluid droplet and the second pulse causes a fluid meniscus in the ink jet to move without ejecting a droplet.
Embodiments of this aspect of the invention may include one or more of the following features. Each period of the voltage waveform includes either the first pulse or the second pulse. The second pulse is applied to the ink jet contemporaneously to applying the first pulse to other ink jets in the inkjet module. In a further aspect of the invention, a system comprises an inkjet module including a plurality of ink jets; and an electronic controller configured to deliver a voltage waveform to at least one of the ink jets in the inkjet module each period of a jetting cycle, the voltage waveform comprising a first pulse or a second pulse, the first pulse causing the ink jet to eject a fluid droplet and the second pulse causing a fluid meniscus in the ink jet to move without ejecting a droplet.
Embodiments of this aspect of the invention may include one or more of the following features. Each ink jet comprises a piezoelectric transducer. The inkjet module comprises control circuitry configured to activate the ink jets so that the electronic controller applies the drive waveform to activated ink jets but not to ink jets that are not activated. The control circuitry is configured to activate all of the ink jets contemporaneously to applying the second pulse to the inkjet module. The electronic controller is configured to deliver the same drive waveform to each activated ink jet. Alternatively, the electronic controller is configured to deliver different drive waveforms to different ink jets. In some embodiments, the inkjet module comprises 16 or more ink jets. A pulse that causes the fluid meniscus in an each ink jet to move in response to the pulse without ejecting a droplet is referred to herein as a “tickle pulse.” The voltage waveform can be applied to the ink jet module periodically, corresponding to each jetting cycle of the module.
Embodiments of the method and system described above can include one or more of the following advantages. Applying a tickle pulse to each ink jet each jetting cycle can reduce the effects of fluid evaporation from a nozzle of each ink jet, and can prevent, or at least reduce, the chance that a nozzle will dry out. This can be particularly advantageous when jetting highly volatile fluids (e.g., solvent-based inks) and/or when an ink jet remains inactive for an extended period of time during operation. Increasing jet “open time” (i.e., the length of time an inactive jet remains capable of optimal jetting before drying out) can improve reliability of printheads utilizing ink jet modules, particularly during jetting operations where one or more nozzle remains inactive for an extended period.
In embodiments, tickle pulses can be applied to each jet each cycle with little (if any) modification to drive electronics. The tickle pulse can be effectuated by modifying the drive waveform and the timing of an “all on” signal, which activates all ink jets in a module.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features and advantages of the invention will be apparent from the description and drawings, and from the claim.
Referring to
Referring to
During operation, controller 20 supplies a periodic waveform to ink jet module 12. One period of the waveform can include one or more pulses. Controller 20 also provides logic signals that activate or deactivate individual ink jets. When an ink jet is activated, controller 20 applies the waveform to the ink jet's piezoelectric actuator.
Referring also to
In general, each cycle of the periodic waveform includes a first pulse and a second pulse. The first pulse has a sufficiently large amplitude and/or period to cause an activated ink jet to eject a fluid droplet. This pulse is also referred to as an ejection pulse. The second pulse is a tickle pulse and has an amplitude and/or period insufficient to cause an activated ink jet to eject a droplet. For each cycle of the periodic waveform, controller 20 activates selected jets during the first pulse, causing each of the selected ink jets to eject a droplet. Controller 20 activates all the ink jets during the second pulse.
The second pulse causes motion of a meniscus in each jet nozzle. Where the meniscus has receded due to, e.g., evaporation of the fluid from the nozzle, the tickle pulse can restore the meniscus to the position it would assume after jetting a droplet. Accordingly, after each cycle, the position of the meniscus in each nozzle can be substantially the same, regardless of whether or not the jet was activated for that cycle.
Referring to
Pulse 310 is a bipolar pulse that includes a first trapezoidal portion of negative voltage followed by a second portion having positive voltage. The trapezoidal portion has a minimum voltage of β, which is maintained for a period. The second portion has a maximum voltage of α, also held for a period. The voltage is then reduced to an intermediate positive voltage that is held for a period before the pulse ends.
The shape of pulse 310, α, β, and T310 are selected so that an activated ink jet driven by pulse 310 ejects a droplet of a predetermined volume. β can be about −5 V or less (e.g., about −10 V or less, about −15 V or less, about −20 V or less). α can be about 5 V or more (about 10 V or more, about 20 V or more, about 30 V or more, about 40 V or more, about 50 V or more, about 60 V or more, about 70 V or more, about 80 V or more, about 90 V or more, about 100 V or more). In some embodiments, α-β can be about 30 V or more (e.g., about 40 V or more, about 50 V or more, about 60 V or more, about 70 V or more, about 80 V or more, about 90 V or more, about 100 V or more, about 110 V or more, about 120 V or more, about 130 V or more, about 140 V or more, about 150 V or more). Generally, T310 is within a range from about 1 μs and about 100 μs (e.g., about 2 μs or more, about 5 μs or more, about 10 μs or more, about 75 μs or less, about 50 μs or less, about 40 μs or less).
Pulse 320 is a unipolar, rectangular pulse that has a maximum amplitude of γ. In general, γ and T320 are selected so that activated ink jets driven by pulse 320 do not eject droplets, but still experience a pressure wave causing the position of the meniscus to vibrate in each activated jets nozzle. γ can be the same or different from β. In some embodiments, γ is about 100 V or less (e.g., about 90 V or less, about 80 V or less, about 70 V or less, about 60 V or less, about 50 V or less, about 40 V or less, about 30 V or less, about 20 V or less). T320 can be about 20 μs or less (e.g., about 15 μs or less, about 10 μs or less, about 8 μs or less, about 5 μs or less, about 4 μs or less, about 3 μs or less, about 2 μs or less, about 1 μs or less).
In embodiments, T is in a range from about 20 μs to about 500 μs, corresponding to a range of jetting frequencies from about 50 kHz to about 2 kHz. For example, in some embodiments, T corresponds to a jetting frequency of about 5 kHz or more (e.g., about 10 kHz or more, about 15 kHz or more, about 20 kHz or more, about 25 kHz or more, about 30 kHz or more).
Logic signals corresponding to waveform 300 are shown in
Referring specifically to
Referring to
Referring to
While in the foregoing embodiment, every ink jet in the module is activated for a tickle pulse every drive cycle regardless of whether the ink jet is activated for an ejection pulse, other implementations are also possible. For example, in some embodiments, each drive cycle, each ink jet can be activated either by a drive waveform or a tickle pulse. In other words, in each drive cycle, those ink jets that are not activated for the ejection pulse are activated for the tickle pulse, and vice versa.
For example, referring to
The implementations described above utilize a single waveform which includes both an ejection pulse and a tickle pulse. More generally, however, implementations can include using different waveforms for the ejection pulse and tickle pulse.
Referring to
In general, the design of the control circuitry used to generate the drive waveforms and to control delivery of the drive waveforms to individual jets may vary as desired. Typically, the drive waveform is provided by a waveform generating device such as an amplifier (or other electronic circuit) that outputs the desired waveform based on a lower voltage waveform supplied to the amplifier. Ink jet modules may utilize a single waveform generating device, or multiple devices. In some embodiments, each ink jet in an ink jet module can utilize its own individual waveform generating device.
Although the waveform shown in
In general, ink jet modules, such as ink jet module 12, can be used to jet a variety of fluids, such as various inks (e.g., UV curing ink, solvent-based ink, hot-melt ink) and or liquids, including liquids containing adhesive materials, electronic materials (e.g., electrically conductive or insulating materials), or optical materials (such as organic LED materials).
Furthermore, the jetting schemes discussed can be adapted to other droplet ejection devices in addition to those described above. For example, the drive schemes can be adapted to ink jets described in U.S. patent application Ser. No. 10/189,947, entitled “PRINTHEAD,” by Andreas Bibl and coworkers, filed on Jul. 3, 2003, and U.S. patent application Ser. No. 09/412,827, entitled “PIEZOELECTRIC INK JET MODULE WITH SEAL,” by Edward R. Moynihan and coworkers, filed on Oct. 5, 1999, the entire contents of which are hereby incorporated by reference.
A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments in the claims.
This application is a continuation application and claims priority under 35 U.S.C. §120 to U.S. patent application Ser. No. 11/321,941, entitled “INK JET PRINTING,” filed on Dec. 29, 2005, now U.S. Pat. No. 8,708,441, which claims benefit under U.S.C. §119(e) to Provisional Application No. 60/640,538, entitled “INK JET PRINTING,” filed on Dec. 30, 2004. The entire contents of both applications are incorporated herein by reference.
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Number | Date | Country | |
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20140184677 A1 | Jul 2014 | US |
Number | Date | Country | |
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60640538 | Dec 2004 | US |
Number | Date | Country | |
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Parent | 11321941 | Dec 2005 | US |
Child | 14202029 | US |