CN114981089A - Ink jet recording apparatus and recording operation driving method - Google Patents

Ink jet recording apparatus and recording operation driving method Download PDF

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Publication number
CN114981089A
CN114981089A CN202080093239.1A CN202080093239A CN114981089A CN 114981089 A CN114981089 A CN 114981089A CN 202080093239 A CN202080093239 A CN 202080093239A CN 114981089 A CN114981089 A CN 114981089A
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China
Prior art keywords
discharge
ink
drive pulse
driving
pulse
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CN202080093239.1A
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CN114981089B (en
Inventor
李昕泽
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Konica Minolta Inc
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Konica Minolta Inc
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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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04595—Dot-size modulation by changing the number of drops per dot
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04596—Non-ejecting pulses
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/10—Finger type piezoelectric elements

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

A head driving unit for driving a recording operation of an ink jet head can apply a discharge driving pulse (Pa) for discharging ink from a nozzle and a non-discharge driving pulse (Pb) to the extent that a meniscus formed in the nozzle is operated without discharging ink from the nozzle. The head driving unit performs the following discharge driving during the ink discharge period for forming one dot during the recording operation: a dot diameter is changed by applying a discharge drive pulse to a dot on a recording medium by the number of times that a number of gradations n is an upper limit, and the following non-discharge drive is performed during a non-discharge period of ink in a recording operation: the meniscus is operated by applying a non-discharge drive pulse m times equal to or more than the number n of gradations for a period equal to the ink discharge period for forming one dot.

Description

Ink jet recording apparatus and recording operation driving method
Technical Field
The invention relates to an ink jet recording apparatus and a recording operation driving method.
Background
Conventionally, there is known an ink jet device that circulates ink through an ink jet head and discharges the ink from a nozzle of the ink jet head.
Generally, an inkjet recording apparatus is mounted with an inkjet head in which a plurality of nozzles for discharging minute ink droplets are arranged.
Since these nozzles discharge ink from a small-diameter discharge port, the state of a meniscus formed in the nozzle before discharge significantly affects the flying state of the liquid droplets, that is, the image quality of the printed matter. The improvement of the stability of the liquid droplets discharged from the inkjet head nozzles is an important issue because it relates to the image quality of the printed matter.
On the other hand, it is achieved that a multi-drive signal containing a plurality of drive pulses is generated and relatively large droplets are discharged.
However, when the discharge is repeated and the discharge is not performed, the state and the position of the meniscus before the discharge are also changed. Therefore, when discharging after the non-discharge period, the possibility that the discharge becomes unstable due to non-discharge of the liquid droplets, flight curvature, or the like becomes high.
In the invention described in patent document 1, in order to prevent discharge abnormality caused by foreign matter adhering to the edge of the nozzle, a non-discharge drive voltage for moving the meniscus to the outside of the non-discharge nozzle is supplied to the inkjet head. At this time, the relationship between the diameter dn of the non-discharge nozzle and the meniscus diameter dm after moving to the outside of the non-discharge nozzle satisfies 1.1 dm/dn 1.4.
Patent document 1: japanese patent laid-open publication No. 2013-199021
However, the invention described in patent document 1 aims to prevent discharge abnormality due to adhesion of foreign matter, and the meniscus formed by the non-discharge drive voltage is statically determined.
Even if a statically fixed meniscus is formed during non-discharge as in the invention described in patent document 1, instability such as non-discharge and flight curvature of a droplet during subsequent discharge cannot be eliminated.
Disclosure of Invention
The present invention has been made in view of the above problems in the conventional technology, and an object thereof is to stably discharge large droplets by an ink jet recording apparatus.
An aspect of the present invention is an inkjet recording apparatus including:
an ink jet head having a pressure chamber communicating with a nozzle, the ink in the pressure chamber being discharged from the nozzle; and
a head driving part for driving the recording operation based on the ink jet head,
the head driving unit may apply a discharge driving pulse for discharging ink from the nozzle and a non-discharge driving pulse to a degree that the meniscus formed in the nozzle is operated without discharging ink from the nozzle, the discharge driving pulse and the non-discharge driving pulse being driving pulse voltages for expanding and contracting the pressure chamber,
during ink discharge for forming one dot in a recording operation, the head driving section performs the following discharge driving: a discharge drive pulse is applied to one dot landing on the recording medium a number of times with the number of gradations n being an upper limit to change the dot diameter in accordance with the number of times,
the head driving section performs a non-discharge driving operation during a non-discharge period of ink during a recording operation, the non-discharge driving operation including: the meniscus is operated by applying a non-discharge drive pulse m times equal to or more times than the number n of gradations for a period equal to an ink discharge period for forming one dot.
Another aspect of the present invention is a recording operation driving method for driving a recording operation by an inkjet head having a pressure chamber communicating with a nozzle and discharging ink in the pressure chamber from the nozzle, wherein,
in the above-described recording operation driving method,
using a discharge drive pulse for discharging ink from the nozzle and a non-discharge drive pulse of a degree that the meniscus formed in the nozzle is operated without discharging ink from the nozzle, the discharge drive pulse and the non-discharge drive pulse being drive pulse voltages for expanding and contracting the pressure chamber,
during ink discharge for forming one dot at the time of recording operation, the following discharge driving is performed: a discharge drive pulse is applied to one dot landing on the recording medium a number of times with the number n of gradations as an upper limit to change the dot diameter according to the number of times,
during the ink non-discharge period in the recording operation, the following non-discharge driving is performed: the meniscus is operated by applying a non-discharge drive pulse m times equal to or more times than the number n of gradations for a period equal to an ink discharge period for forming one dot.
According to the present invention, it is possible to stably discharge large droplets by an inkjet recording apparatus.
Drawings
Fig. 1 is a block diagram showing a functional configuration of an inkjet recording apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic view of the pressure chamber and the nozzle viewed in the axial direction of the nozzle, showing a change in the pressure chamber corresponding to the drive pulse voltage.
Fig. 3 is a schematic diagram illustrating the operation of ink droplets discharged from the nozzles.
Fig. 4 is a waveform diagram of a drive signal showing an example of a drive pulse voltage according to an embodiment of the present invention.
Fig. 5 is a waveform diagram of a drive signal showing a drive pulse voltage according to a comparative example.
FIG. 6 is a cross-sectional view of a nozzle and a statically stable meniscus.
FIG. 7 is a cross-sectional view of the nozzle and meniscus after continuous discharge.
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following is an embodiment of the present invention, and the present invention is not limited thereto.
The inkjet recording apparatus 1 includes: the transport unit 10, the recording operation unit 20, the cleaning unit 30, the control unit 40, the storage unit 50, the communication unit 70, the operation receiving unit 81, the display unit 82, the power supply unit 90, and the like.
The transport unit 10 moves a recording medium to be subjected to image recording so as to face a recording range by the recording operation unit 20. The transport unit 10 includes, for example, a transport motor 14 that pulls out a long recording medium wound in a roll at a predetermined speed. The recording medium is, for example, a fabric, but may be other materials such as paper.
The recording operation unit 20 performs an operation of discharging ink onto a recording medium to record an image. The recording operation unit 20 includes an inkjet head 21 having a plurality of nozzles 27 arranged in a predetermined pattern to discharge ink and a piezoelectric element 26 that deforms an ink flow path (pressure chamber) for supplying ink to the nozzles 27 to apply pressure variation to the ink, and a head driving unit 25 that outputs a driving pulse voltage for deforming each piezoelectric element 26.
As shown in fig. 2, the driving pulse voltage P is applied to the piezoelectric element 26, whereby the side wall 29 of the pressure chamber 28 communicating with the nozzle 27 is deformed, and as shown in fig. 3, the meniscus 22 formed in the vicinity of the discharge opening of the nozzle 27 is oscillated, and the ink droplet 23 is separated from the meniscus 22 and discharged.
The cleaning unit 30 includes: a wiping member 32 for removing ink and cured ink from the nozzle surface on which the openings of the nozzles 27 are arranged; a driving unit 31 for operating the wiping member 32. The wiping member 32 is not particularly limited, and may be, for example, a nonwoven fabric for absorbing ink, a resin member on a blade for scraping solids, or the like.
The control unit 40 is a processor that collectively controls the overall operation of the inkjet recording apparatus 1. The control Unit 40 includes, for example, a CPU41(Central Processing Unit) and a RAM42(Random Access Memory). The CPU41 performs arithmetic operations and various control processes. The RAM42 provides the CPU41 with a storage space for work, and stores temporary data.
The storage unit 50 stores image data to be recorded and processing data thereof, and stores other setting data, programs, and the like. The image data may be stored in, for example, a DRAM or the like which temporarily stores a large amount of image data and can output the image data at high speed. The setting data, program, and the like are stored in a nonvolatile memory such as a flash memory that can store even when the supply of power to the ink jet recording apparatus 1 is stopped, an HDD (Hard Disk Drive), and the like.
The communication unit 70 controls data transmission and reception with an external device according to a predetermined communication standard (for example, TCP/IP). The communication unit 70 may be connected to a LAN (Local Area Network) or the like, connected to an external Network via a router or the like, or directly connected to a peripheral device via a USB cable connected to a USB terminal.
The power supply unit 90 supplies power from a power source to the inkjet recording apparatus 1.
Next, driving of the recording operation will be described.
The head driving unit 25 applies a driving pulse voltage P for expanding and contracting the pressure chamber 28 to the piezoelectric element 26. Two kinds (Pa, Pb) shown in fig. 4 are used as the driving pulse voltage P. The head driving unit 25 can apply a discharge driving pulse Pa for discharging ink from the nozzles 27 and a non-discharge driving pulse Pb to the extent that ink is not discharged from the nozzles 27 and the meniscus 22 formed in the nozzles 27 is operated.
The voltage value of the discharge drive pulse Pa is Va, the pulse width (time from the rise of the pulse to the start of the fall) is Pwa, the voltage value of the non-discharge drive pulse Pb is Vb, and the pulse width is Pwb.
The head driving unit 25 performs the following discharge driving during an ink discharge period Ta (equal to a period T) for forming one dot during a recording operation: a discharge drive pulse is applied to one dot landing on a recording medium a number of times with the number of gradations n being an upper limit to change the dot diameter according to the number of times.
In the present embodiment, n is 8.
In the example shown in fig. 4, in order to form the maximum dot diameter, the discharge drive pulse Pa of 8 pulses is applied within the period T.
By application of each pulse of the discharge drive pulse Pa, the ink droplet is discharged as shown in fig. 3, and landed on the recording medium.
The dot diameter is changed by selecting the number of droplets discharged by selecting the number of pulses of the discharge driving pulse Pa. The inkjet recording apparatus 1 adopts a recording system that performs gradation expression in this manner.
The head driving unit 25 performs the following non-discharge driving in the ink non-discharge period Tb (period T) during the recording operation: the meniscus 22 is operated by applying m times of non-discharge drive pulses Pb equal to or more than the number of gradations n. The non-discharge period Tb is equal to the ink discharge period Ta for forming one dot, and corresponds to the period T. In the present embodiment, n-m-8.
The voltage value Vb of the non-discharge drive pulse Pb is set lower than the voltage value Va of the discharge drive pulse Pa. The pulse width Pwb of the non-discharge drive pulse Pb is set to be narrower than the pulse width Pwa of the discharge drive pulse Pa. This is for preventing the discharge of ink from occurring by the application of the non-discharge drive pulse Pb. The condition that the ink discharge does not occur by the application of the non-discharge drive pulse Pb is set so that the meniscus 22 can be largely operated to a degree close to that at the time of discharge. Therefore, it is preferable that the pulse width satisfies the condition that Pwa < Pwb < Pwa. In addition, it is preferable that the voltage value satisfies the condition of 0.3 < Vb/Va < 0.5.
In addition, either one of the voltage value Vb and the pulse width Pwb of the non-discharge drive pulse Pb may be equal to the discharge drive pulse Pa, or the other may be adjusted so that discharge of ink does not occur.
The ink discharge period Ta and the ink non-discharge period Tb during the recording operation are periods for the respective nozzles. When a certain nozzle is in the ink discharge period Ta, the other nozzles may be in the ink non-discharge period Tb, and therefore the ink discharge period Ta or the ink non-discharge period Tb is not determined in the entire apparatus.
Fig. 5 shows a driving pulse of a comparative example.
This comparative example is different in that no pulse voltage is applied to the ink non-discharge period Tb, and is otherwise the same as the driving pulse of the present embodiment shown in fig. 4.
In a static steady state before the application of the drive pulse, as shown in fig. 6, the meniscus 22a is kept concave at a position substantially corresponding to the discharge opening of the nozzle 27.
If there is continuous discharge, particularly continuous discharge of large droplets (n is 8), the meniscus gradually recedes to the depth of the nozzle 27. When the ink non-discharge period Tb is entered after the continuous discharge, the meniscus 22b is located at the back of the nozzle 27 as shown in fig. 7, and the meniscus 22b is located close to the discharge opening of the nozzle 27 by the ink supply with the fluctuation and attenuation with the lapse of time. However, when the pulse voltage is not applied to the ink non-discharge period Tb, the position and the state of fluctuation of the meniscus 22b are unstable, and the position and the state of fluctuation vary at the start of the ink discharge period Ta next to the ink non-discharge period Tb. When the continuous discharge is performed, the state of fig. 6 and the state of fig. 7 are repeated, and the meniscus becomes unstable. Thus, in the ink discharge period Ta after the ink non-discharge period Tb, the possibility that the discharge becomes unstable due to non-discharge of liquid droplets, flying deflection, or the like becomes high.
In the demonstration experiment of the comparative example in which the driving was performed with the repetition pattern of fig. 5 with the period T of 175.4 μ s and the Pwa of 1.2AL, it was confirmed that no droplet was discharged when the droplet speed reached 7.6 m/s.
In contrast, in the demonstration experiment of the present example in which the period T is 175.4 μ s and Pwa is Pwb is 1.2AL and the driving is performed in the repetitive pattern of fig. 4, it can be confirmed that: even if the droplet velocity reaches 9.1m/s, no non-discharge of droplets occurs, and ink can be stably discharged.
In the present example, a constant fluctuation of the meniscus with a frequency and amplitude close to those of the ink discharge period Ta occurs during the ink non-discharge period Tb, and the meniscus is dynamically stabilized by an operation close to that of the ink discharge period Ta.
Therefore, the ink discharge period Ta next to the ink non-discharge period Tb is a condition close to the ink discharge period Ta before the ink discharge period Tb, and the ink discharge is stable as in the case of continuous discharge.
In order to obtain the above effects, m.gtoreq.n is preferable. In particular, as in the present embodiment, m is preferably equal to n. In the ink non-discharge period Tb, the meniscus can be shaken the same number of times as the ink discharge period Ta, and the ink discharge is stabilized in the next ink discharge period Ta.
In order to effectively obtain the above effects, the following conditions were further used.
The discharge opening diameter of the nozzle 27 is dn, and the condition of 20 μm < dn < 50 μm is satisfied. It is more preferable that the condition of 30 μm < dn < 50 μm is satisfied.
Inks with specific gravities greater than 1 are used.
The condition that Pwa is more than or equal to 1AL and less than or equal to 1.4AL is met. Further preferably satisfies 1.2 AL. ltoreq. Pwa. ltoreq.1.4 AL. Further, AL is one-half of the natural vibration cycle of the pressure chamber 28.
As described above, according to the present embodiment, it is possible to stably discharge large droplets by the inkjet recording apparatus.
Industrial applicability
The present invention can be used for an inkjet recording apparatus.
Description of reference numerals: 1 … inkjet recording device; 20 … recording operation part; 21 … ink jet head; 22 … meniscus; 23 … ink droplets; 25 … head drive; a 27 … nozzle; 28 … pressure chamber; 40 … control section; p … driving pulse voltage; t … cycle.

Claims (18)

1. An ink jet recording apparatus includes:
an inkjet head having a pressure chamber communicating with a nozzle, ink in the pressure chamber being discharged from the nozzle; and
a head driving unit for driving a recording operation based on the ink jet head,
the head driving unit may apply a discharge driving pulse for discharging ink from the nozzles and a non-discharge driving pulse to a degree that the meniscus formed in the nozzles is operated without discharging ink from the nozzles, the discharge driving pulse and the non-discharge driving pulse being driving pulse voltages for expanding and contracting the pressure chambers,
during ink discharge for forming one dot at the time of a recording operation, the head driving section performs discharge driving as follows: a discharge drive pulse is applied to one dot landing on the recording medium a number of times with the number n of gradations as an upper limit to change the dot diameter according to the number of times,
the head driving section performs non-discharge driving during a non-discharge period of ink in a recording operation, the non-discharge driving including: the meniscus is actuated by applying a non-discharge drive pulse m times equal to or more than the number n of gradations for a period equal to an ink discharge period for forming one dot.
2. The inkjet recording apparatus according to claim 1, wherein,
the pulse width of the discharge drive pulse is represented by Pwa, and the pulse width of the non-discharge drive pulse is represented by Pwb, and the relationship of 0.6Pwa < Pwb < Pwa is satisfied.
3. The inkjet recording apparatus according to claim 1 or 2, wherein,
the voltage value of the discharge drive pulse is Va, and the voltage value of the non-discharge drive pulse is Vb, and the relationship of 0.3 < Vb/Va < 0.5 is satisfied.
4. The inkjet recording apparatus according to any one of claims 1 to 3, wherein,
and m is n.
5. The inkjet recording apparatus according to any one of claims 1 to 4, wherein,
the diameter of the discharge opening of the nozzle is dn, and 20 [ mu ] m < dn < 50 [ mu ] m is satisfied.
6. The inkjet recording apparatus according to any one of claims 1 to 4, wherein,
the diameter of the discharge opening of the nozzle is dn, and 30 [ mu ] m < dn < 50 [ mu ] m is satisfied.
7. The inkjet recording apparatus according to any one of claims 1 to 6, wherein,
the specific gravity of the ink is greater than 1.
8. The inkjet recording apparatus according to any one of claims 1 to 7, wherein,
a pulse width of the discharge drive pulse is represented by Pwa, and one-half of a natural vibration period of the pressure chamber is represented by AL, and 1AL < Pwa < 1.4AL is satisfied.
9. The inkjet recording apparatus according to any one of claims 1 to 7, wherein,
the pulse width of the discharge drive pulse is represented by Pwa, and one-half of the natural vibration period of the pressure chamber is represented by AL, and 1.2 AL-1.4 AL is satisfied.
10. A recording operation driving method of driving a recording operation by an ink jet head having a pressure chamber communicating with a nozzle and discharging ink in the pressure chamber from the nozzle, wherein,
in the recording action driving method, the recording action is driven,
using a discharge drive pulse for discharging ink from the nozzle and a non-discharge drive pulse of a degree that the meniscus formed in the nozzle is operated without discharging ink from the nozzle, the discharge drive pulse and the non-discharge drive pulse being drive pulse voltages for expanding and contracting the pressure chamber,
during ink discharge for forming one dot at the time of recording operation, the following discharge driving is performed: a discharge drive pulse is applied to one dot landing on the recording medium a number of times with the number n of gradations as an upper limit to change the dot diameter according to the number of times,
during the ink non-discharge period in the recording operation, the following non-discharge driving is performed: the meniscus is actuated by applying a non-discharge drive pulse m times equal to or more than the number n of gradations for a period equal to an ink discharge period for forming one dot.
11. The recording motion driving method according to claim 10,
the pulse width of the discharge drive pulse is represented by Pwa, and the pulse width of the non-discharge drive pulse is represented by Pwb, so that 0.6Pwa < Pwb < Pwa.
12. The recording motion driving method according to claim 10 or 11,
the voltage value of the discharge drive pulse is Va, and the voltage value of the non-discharge drive pulse is Vb, and the relationship of 0.3 < Vb/Va < 0.5 is satisfied.
13. The recording operation driving method according to any one of claims 10 to 12,
and m is n.
14. The recording operation driving method according to any one of claims 10 to 13,
the diameter of the discharge opening of the nozzle is dn, and 20 [ mu ] m < dn < 50 [ mu ] m is satisfied.
15. The recording operation driving method according to any one of claims 10 to 13,
the diameter of the discharge opening of the nozzle is dn, and 30 [ mu ] m < dn < 50 [ mu ] m is satisfied.
16. The recording operation driving method according to any one of claims 10 to 15,
the specific gravity of the ink is greater than 1.
17. The recording operation driving method according to any one of claims 10 to 16,
the pulse width of the discharge drive pulse is represented by Pwa, and one-half of the natural vibration period of the pressure chamber is represented by AL, and 1 AL-Pwa-1.4 AL is satisfied.
18. The recording operation driving method according to any one of claims 10 to 16,
the pulse width of the discharge drive pulse is represented by Pwa, and one-half of the natural vibration period of the pressure chamber is represented by AL, and 1.2 AL-1.4 AL is satisfied.
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