JP3500692B2 - Ink jet recording device - Google Patents

Ink jet recording device

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Publication number
JP3500692B2
JP3500692B2 JP8066994A JP8066994A JP3500692B2 JP 3500692 B2 JP3500692 B2 JP 3500692B2 JP 8066994 A JP8066994 A JP 8066994A JP 8066994 A JP8066994 A JP 8066994A JP 3500692 B2 JP3500692 B2 JP 3500692B2
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Japan
Prior art keywords
ink
pressure
pressure chamber
generating element
dot
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JP8066994A
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JPH07285222A (en
Inventor
和充 嶋田
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セイコーエプソン株式会社
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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure generating element which generates a pressure on a pressure generating element by an electric signal, and causes the ink drop to fly on the recording medium such as a recording paper. The present invention relates to an ink jet recording apparatus such as a printer that forms an ink image. 2. Description of the Related Art Ink jet recording apparatuses are characterized by the fact that they are non-impact, have low noise, are capable of producing color output through the use of multicolor inks, and are characterized by the fact that the head configuration is simple and can be manufactured at low cost. It is widespread. An outline of a recording method of the ink jet recording apparatus will be described with reference to FIGS. FIG. 5 is a structural explanatory view of an ink jet head which is a main part of an ink jet recording apparatus that discharges ink from a nozzle by a pressure fluctuation of a pressure generating element. Reference numeral 10 shown in FIG. 5 is a nozzle forming substrate on which a plurality of nozzles 1 are formed. The opening area of the nozzle 1 and the thickness of the nozzle forming substrate 10 have a great influence on the ink ejection characteristics. The flow path substrate 11 bonded to the nozzle forming substrate 10 is a member that forms a communication port of the pressure chamber 12, the segment ink supply path 13, the common ink chamber 14, and the ink supply pipe 15. The pressure chamber 12, the segment ink supply path 13,
The common ink chamber 14 is filled with ink. On the other hand, pressure generating elements 17 arranged on a base substrate 16 are joined to the bottom surface of the flow path substrate 11 so as to correspond to the respective pressure chambers 12. When the segment signal 19 from the drive circuit 21 and the common signal 20 are applied to the pressure generating element 17, the volume of the pressure chamber 12 decreases and the pressure increases,
Ink is ejected from the nozzle 1. FIG. 7 is a diagram showing a state in which the pressure chamber 12 is contracted in volume (a) and expanded (b) due to the pressure fluctuation of the pressure generating element 17. [0004] Here, in the case of one pressure change, satellite dots as well as main dots ejected from the nozzle 1 are ejected with a time delay. The satellite dots are mainly due to the natural vibration of the volume velocity of the ink due to the natural vibration (Ta) of the pressure generating element 17 and the natural vibration (Tc) of the pressure chamber 12, and land with a slight deviation from the landing position of the main dot. This causes a problem of deteriorating the output quality. In order to solve such a problem, many techniques for preventing generation of satellite dots have been proposed. For example, in Japanese Patent Application Laid-Open No. Sho 59-133067, residual vibration is suppressed by applying a second pressure fluctuation following a first pressure fluctuation. In Japanese Patent Application Laid-Open No. 61-206662, a plurality of pressure fluctuations are caused. Combining a plurality of dots.
Japanese Patent Application Laid-Open No. 192947 proposes a technique for preventing generation of satellite dots by performing driving in accordance with the natural oscillation period of the volume velocity of ink. In order to output a good image in ink jet recording, the size of the ink droplet to be ejected is reduced to increase the resolution, or the size of the ink droplet is controlled or the size of the ink droplet ejected into one pixel is increased. There has been proposed a method of controlling the number of pixels to perform gradation expression. For example, JP-A-4-285
No. 47 proposes a technique of outputting a high quality image by landing a plurality of ink droplets within a certain distance in a so-called multi-droplet system in which a plurality of dots land in one pixel. However, in the above two technologies for preventing the generation of satellites, complicated driving conditions are required for performing a plurality of pressure fluctuations, and high circuit cost is required. In addition, there is a problem that it is difficult to increase the driving frequency. Also, to reduce the weight of the main dot ink droplet to achieve high resolution,
For example, measures such as reducing the nozzle diameter can be used, but it is costly to reduce the nozzle diameter, and further, the nozzles are liable to be clogged due to the inclusion of foreign matter in the ink. And JP-A-2-19.
It is difficult to reduce the weight of the main dot even with the technique of Japanese Patent No. 2947. Although the multi-droplet technique can be expected to have high image quality, it still has problems in that the driving frequency is increased, a load for discharging minute dots is applied, and the recording speed is low. [0008] The present invention solves these problems,
An object of the present invention is to provide an ink jet recording apparatus which discharges minute dots with a simple configuration and realizes high-quality output. According to the present invention, there is provided an ink jet recording apparatus comprising: a nozzle for discharging ink; a pressure chamber communicating with the nozzle; a pressure generating element for generating pressure in the pressure chamber; An ink jet recording apparatus having voltage applying means for applying a voltage to a generating element, and discharging ink from a nozzle by a pressure change of the pressure generating element,
A main dot, which is a first ejection ink droplet generated by one pressure fluctuation with the same ink weight, and a satellite dot , which is an ejection ink droplet generated by residual vibration of pressure fluctuation , are adjacent to each other as one pixel. Recording and main scanning
Direction resolution with main dots and satellite dots.
In this case, the resolution is 1/2 times the sub-scanning direction . [0010] Alternatively, a nozzle for discharging ink and
And a pressure that generates pressure in this pressure chamber
Force generating element and voltage for applying voltage to this pressure generating element
Having an application means, and by a pressure fluctuation of the pressure generating element,
For inkjet recording devices that eject ink from nozzles
, The first ejected ink droplet generated by one pressure fluctuation
In a discharge speed of the main dots Vm (m / s), the pressure variation
Vs (m / s) is the ejection speed of the satellite dots, which are the ejection ink droplets generated by the residual vibration , ts (s) is the ejection time difference between the main dot and the satellite dots, and f (H
z), when the distance between the nozzle and the recording medium is G (m) , the main dot and the sub dot are satisfied by satisfying the following equation.
The feature is that the ink weight of the terite dot is made the same . ## EQU2 ## Alternatively , a nozzle for discharging ink and
And a pressure that generates pressure in this pressure chamber
Force generating element and voltage for applying voltage to this pressure generating element
Having an application means, and by a pressure fluctuation of the pressure generating element,
For inkjet recording devices that eject ink from nozzles
In this case, the pressure is changed by the pressure fluctuation of the pressure generating element.
Ink is ejected from the nozzle by expanding and contracting the chamber
The residual vibration due to the expansion of the pressure chamber causes the surface tension of the ink.
The pressure chamber beyond the point at which it can be held by force
Of the first pressure fluctuation caused by one pressure fluctuation
The main dot, which is a small ink droplet, and the remaining pressure fluctuation
Satellites, which are small droplets of ink ejected due to vibration
The ink weight of the dots is the same. Alternatively, a nozzle for discharging ink, and
And a pressure that generates pressure in this pressure chamber
Force generating element and voltage for applying voltage to this pressure generating element
Having an application means, and by a pressure fluctuation of the pressure generating element,
For inkjet recording devices that eject ink from nozzles
Of the first ejected ink droplet generated by one pressure fluctuation
The residual pressure fluctuation after the ejection of the main dot is
This is a vibration that rapidly contracts the power chamber, and the vibration causes a pressure change.
Sate, which is a small droplet of ink ejected due to residual vibration of motion
By discharging light dots, the main dots
And that the ink weight of the satellite dots is the same
It is characterized by. The ink jet recording apparatus of the present invention positively utilizes the ejection characteristics of the main dot and the satellite dot generated by one pressure change, and further shifts the landing position of each dot to make small droplets of the dot. It is intended to achieve high resolution by realizing high-resolution output. Embodiments of the present invention will be described below in detail with reference to the drawings. First, a control method for ejecting main dots and satellite dots in the same amount will be described. FIG. 6 is a relational diagram showing the voltage waveform for driving the ink jet head having the configuration shown in FIGS. 5 and 7 and the displacement behavior of the pressure generating element described in the prior art. In FIG. 7, a meniscus 24 is formed in the nozzle 1 by the surface tension of the ink. When a voltage is applied, the pressure generating element 17 expands in the displacement direction of the arrow δ as shown in FIG. 7A to reduce the volume of the pressure chamber 12, while on the other hand, when no voltage is applied ( As shown in b), a steady state is reached, and the volume of the pressure chamber is relatively increased. In FIG. 6A, a falling (discharging) time T1 and a rising (charge) time T2 of the voltage waveform 22 are shown.
Is smaller than the natural oscillation period Ta of the pressure generating element,
The displacement behavior 23 of the pressure generating element 17 shows an excessive vibration behavior. In such a case, residual vibration occurs in the pressure chamber 12, and also vibrates the meniscus 24 shown in FIG. On the other hand, as shown in FIG. 6B, when the fall time T1 and the rise time T2 of the voltage waveform 22 applied to the pressure generating element 17 are set to be longer than the natural oscillation period Ta of the pressure generating element 17, The generating element 17 does not exhibit excessive vibration behavior, and the meniscus 24 has small residual vibration. Contrary to the pressure generating element 17 shown in FIG.
A pressure generating element that contracts when a voltage is applied and expands the volume of the pressure chamber 12, while it is in a steady state when no voltage is applied and has a characteristic of relatively reducing the volume of the pressure chamber 12. When 17 is used, the voltage waveform 22 and the displacement behavior 23 shown in FIG. 6 are inverted up and down, but the essential relationship between T1, T2 and Ta is the same. The natural oscillation period Ta of the pressure generating element 17
Is shown as Equation 2. [Equation 3] Here, L is the pressure generating element 17 shown in FIG.
, Ρ is the density of the pressure generating element 17, E is the Young's modulus of the pressure generating element 17, λ is the vibration coefficient of the pressure generating element 17 that varies depending on the vibration mode, and is fixed at one end as shown in FIG. It is 1.875 in the pressure generating element 17 using the longitudinal vibration. In the present invention, the pressure generating element 17 having Ta of about 5 μs is used. FIG. 8 is a relationship diagram showing the voltage waveform 22 and the volume change behavior 25 and the meniscus level 26 in the pressure chamber 12 when the ink jet recording apparatus of the present invention is driven. FIG. 9 is an enlarged view of a main part of an ink jet head for explaining an embodiment of the present invention. In FIG. 8, the pressure generating element 17 shown in FIGS. 5 and 7 is shown as a more specific laminated piezoelectric element 18. The laminated piezoelectric element 18 is composed of a segment electrode 28, a piezoelectric material layer 27, and a common electrode 29, and expands in a laminating direction by applying a voltage (d33 effect) and contracts in a direction perpendicular to the laminating direction (d31 effect). ) Characteristics. A driving method using the d33 effect will be described below with reference to FIGS. The time t0 to t1 is in a steady state. As shown in FIG. 8, in this state, since the voltage level is at Vh, the laminated piezoelectric element 18 shown in FIG. Is at the level of C0, in which the volume of the pressure chamber 12 is relatively contracted. The meniscus level 26 shown in FIG. 8 is maintained at a steady level M0 maintained by the surface tension of the ink. Time t1 to t2 is the first step. FIG.
In this state, the voltage waveform 22 is discharged to the level indicated by VL at the fall time T1, and the volume change 25 of the pressure chamber 12 changes to the level C1 to expand the volume of the pressure chamber 12 as shown in FIG. The pressure in the chamber 12 is reduced.
At this time, when T1 is equal to or less than 1/2 of the natural vibration period Tc of the ink, the volume of the pressure chamber 12 continues to expand even after t2. At this time, an inertial flow of the ink is generated in the pressure chamber 12 toward the nozzle 1. Following this, the meniscus 24 is drawn toward the inside of the pressure chamber 12, and the meniscus level 26 shown in FIG. Time t2 to t3 is the second step. As shown in FIG. 8, the voltage waveform 22 is VL in this state.
, The volume change 25 of the pressure chamber 12 also repeats the oscillation to return to the level C1 in which the volume of the pressure chamber is expanded. The meniscus 26 also attempts to return to the steady level M0 while repeating the vibration. Time t3 to t4 is the third step. As shown in FIG. 8, the voltage waveform 22 is charged again to the level indicated by Vh with a rising time T2 shorter than Tc / 2. At that time, the volume change 25 of the pressure chamber 12 exceeds the level of C0 and further reduces the volume of the pressure chamber 12. As a result, the inside of the pressure chamber 12 is pressurized, so that the meniscus 24 is strongly pushed out in the ink ejection direction, and first, the ink droplet of the main dot flies. The ink ejection amount at this time is substantially equal to the shaded area S shown in FIG.
It corresponds to the area of 1. After that, the voltage waveform 22 maintains the steady state of Vh, but the pressure chamber 12 repeats the oscillation due to a sudden change in volume, and after the main dot is ejected, the meniscus 24 is pushed out again in the ink ejection direction, which corresponds to the area of S2. Ink droplets of satellite dots are ejected. In FIG. 8, the ejection time difference (t5 to t6) between the main dot and the satellite dot is represented by ts. In the method of driving the ink-jet head using the d31 effect, only the voltage waveform 22 shown in FIG. 8 is inverted up and down, but the essential relationship between T1, T2 and Tc is different from the case where the d33 effect is used. The same is true. The natural vibration period Tc of the ink filled in the pressure chamber 12 is expressed by the following equation (3). [Equation 4] Here, Mn is the inertance of the nozzle 1,
Mi is the inertance of the ink supply path, Ci is the compliance of the ink, and Cc is the compliance of the pressure chamber 12. Further, Mn, Mi, Ci, Cc are defined by Equations 4 to 7 as follows. ## EQU5 ## Here, ρ is the density of the ink, and S (x) is
Is a cross-sectional area of the nozzle 1 at a thickness X of the nozzle forming substrate 10, and k is a proportional constant in consideration of an unsteady solution determined by the nozzle shape. (Equation 6) Where ρ is the density of the ink, S (Lc) is the cross-sectional area of the supply path at the ink supply path length Lc shown in FIG. 9, and k is a non-stationary solution determined by the supply path shape. The proportionality constant, n, is the number of supply paths to the nozzles (2 in this embodiment). [Mathematical formula-see original document] Here, v is the volume of the pressure chamber 12, ρ is the density of the ink, and c is the sound speed of the ink. [Equation 8] Here, ΔV is the deformation volume of the pressure chamber per unit pressure, and P0 is the unit pressure. Further, as the ink natural oscillation period Tc determined in this way is smaller, the ink ejection interval can be narrowed, and high-speed printing can be performed. Ideally, the base substrate 16 shown in FIG. 9 is a rigid body, and specifically, it is desirable that the acoustic impedance (Young's modulus × specific gravity) is large. Therefore, as shown in FIG. 9, by holding one end of the multilayer piezoelectric element 18 on the base substrate 16 having a Young's modulus and specific gravity equal to or higher than the Young's modulus and specific gravity of the multilayer piezoelectric element 18, the pressure chamber 12 The pressure can be transmitted efficiently to this. FIGS. 1, 2, and 3 are model diagrams showing the flying states of the main dots 2 and the satellite dots 3 when the ink is ejected from the nozzles 1 with only the driving conditions changed based on the present embodiment. Each flying state could be realized by driving conditions as shown in Table 1. In these experiments, an ink jet head using the d31 effect was used.
Tc was about 17 μs. [Table 1] As shown in Table 1 and FIGS. 1, 2 and 3,
By changing the fall time T1, the hold time H, and the rise time T2, the flying states of the main dots 2 and the satellite dots 3 are greatly different. As described above, this is a phenomenon mainly caused by residual vibration generated by the volume expansion and contraction speed of the pressure chamber 12 and the inertial flow for supplying ink to the pressure chamber 12. In addition, under the conditions of FIG. 1, the weight of the ink droplet including the main dot 2 and the satellite dot 3 is about 0.022 μg, and the weight of each dot is half of that. When the respective ejection speeds were measured, the main dot 2 was 9.3 m / s, and the satellite dot was 4.7 m / s. Next, conditions for landing and recording the main dots 2 and the satellite dots 3 on the recording medium with high accuracy will be described with reference to FIG. FIG. 10 shows a recording medium 3 such as paper.
This simply shows a state in which the inkjet head, which is at a distance of G from the surface Y0 of 0, moves on the X0 surface and performs recording. First, at Xa, the inkjet head ejects the main dots 2 in the direction of the arrow at an ejection speed of Vm. At that time, since the ink jet head is always moving on the X0 plane in the direction of the arrow at the speed of Vp, the main dot 2 discharged at Xa lands on Ya of the recording medium 30 and is recorded. On the other hand satellite dot 3
Is discharged at Xb due to the time difference of ts, and the speed at that time is V
s. Since the velocity component of Vp works like the main dot, it is landed on Yb. Next, the main dot 2 ejected at Xc after the elapse of the 1 / f time lands on Yc. This time from Ya to Yc
Is the length of a pixel corresponding to the resolution d (dot / inch) in the main scanning direction, and the landing position Yb of the satellite dot 3 must be in the middle of Lx in order to achieve high-quality output. . For that purpose, d, Vp, G, Vm, Vs and ts require the relationship of the following equation 8. (Equation 9) At this time, since Vp is represented by f and d, the satellite dot 3 is accurately recorded at the intermediate position of Lx under the condition of Expression 1. In order to achieve high image quality, it is preferable to make the relationship of Expression 1 as close as possible. However, if satellite dots land within a certain range, high image quality can be maintained. Although it depends on the resolution and the characteristics of the recording medium, an output that is not visually noticeable can be obtained with a landing accuracy of about 30%. Exceeding this range may cause, for example, fluctuations when a uniform pattern is output. FIG. 4 is a model diagram of the landing state of the main dots 2 and the satellite dots 3 when recording is performed on the recording medium 30 by changing the distance G using the ink jet head that actually discharges under the conditions of FIG. Show. FIG. 4A shows a landing state when recording is performed while adjusting the distance G so as to substantially satisfy the relationship of Expression 1. The driving frequency f at this time is 4.2 kHz,
Distance G was 1.0 mm. The main dots 2 and the satellite dots 3 land with displacement, and the amount of ink landed per unit area is reduced, which also has the effect of increasing the ink drying speed. One pixel is composed of a main dot 2 and a satellite dot 3 having a small dot size to be recorded, and the resolution in the main scanning direction is set to half the resolution in the sub-scanning direction. It becomes possible.
(B) is an impact state when recording is performed with the distance G smaller than (a), and the main dot 2 and the satellite dot 3 are formed as one dot on the recording medium. The dot diameter at that time is larger in the sub-scanning direction than in FIG. (C) is a landing state when recording is performed with the distance G increased relative to (a), and the main dot 2 and the satellite dot 3 land too far. By controlling the ejection angles of the main dots 2 and the satellite dots 3 ejected from the nozzles 1 with respect to the main scanning direction in some manner, the landing positions can be optimized even if the relationship of Expression 1 is not necessarily satisfied. It is possible to do. FIG. 11 shows one example of the nozzle forming substrate 1.
0 is inclined with respect to the main scanning direction. Accordingly, the ejection angles of the main dots 2 and the satellite dots 3 having different ejection speeds are different as shown in the drawing. FIG.
Shows another example. A surface treatment member 31 exhibiting water repellency to ink is formed on the nozzle forming substrate 10, and an ink reservoir 32 is formed so that the surface treatment member 31 becomes uneven around the nozzle 1. Due to the effect of the surface tension of the ink, the ejection angle of the main dot 2 and the ejection angle of the satellite dot 3 at the time of ejection can be different. Therefore, main dot 2
By optimizing the distance G according to various conditions such as the ejection speed Vm of the satellite dots 3, the ejection speed Vs of the satellite dots 3, and the respective ejection angles, the landing positions of the main dots 2 and the satellite dots 3 can be controlled and optimized. It becomes possible. FIG. 13 shows a dot landing image when the resolution is changed by changing the ink droplet. (A)
In contrast to the 300 dpi recording, (b) is a recording at 600 dpi, and a high-quality output can be obtained, but if the driving frequency is not changed, four times the time is required. (C) is a recording method in which the resolution is increased only in the main scanning direction. In this case, the output time can be doubled. It is easy to make a gap. (D) is a landing image by the ink jet recording apparatus of the present invention, in which high-quality output can be obtained without taking much output time in comparison with the comparative examples (a) to (c). As described above, when the ink jet recording apparatus of the present invention is used, the ejection characteristics of the main dots 2 and the satellite dots 3 generated by one pressure change are positively used, and the landing positions of the respective dots are further used. By shifting, the resolution can be increased by reducing the size of the dots, and high-quality output can be realized. Although the present ink jet recording apparatus has been described using an ink jet recording apparatus which mechanically causes a pressure fluctuation, the present invention can also be applied to a so-called bubble jet ink jet recording apparatus which ejects ink droplets by pressure fluctuation due to thermal expansion, for example. It is. Further, the present invention can be applied not only to monochromatic recording but also to color recording. As is apparent from the above description, the ink jet recording apparatus of the present invention performs control so that the ink weights of the main dot and the satellite dot generated by one pressure change become approximately the same. By shifting the landing position of each dot, high resolution can be achieved by reducing the size of the dot, and an effect that an inkjet recording apparatus capable of realizing high-quality output can be provided at low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a model diagram of an ink jet recording apparatus according to an embodiment of the present invention in an ink droplet ejection state. FIG. 2 is a model diagram of an ink droplet ejection state when an ejection condition is changed in the embodiment of the inkjet recording apparatus of the present invention. FIG. 3 is a model diagram of an ink droplet ejection state when an ejection condition is changed in the embodiment of the inkjet recording apparatus of the present invention. FIG. 4 is a model diagram showing an ink droplet landing state when the distance between a nozzle and a recording medium is changed in the embodiment of the ink jet recording apparatus of the present invention. FIG. 5 is a structural explanatory view showing a main part of a head of the ink jet recording apparatus of the present invention. FIG. 6 is a relationship diagram showing a voltage waveform for driving a head of the inkjet recording apparatus of the present invention and a displacement behavior of a pressure generating element. FIG. 7 shows an ink jet recording apparatus according to the present invention.
(A) is an explanatory view showing a state in which the volume of the pressure chamber is contracting, and (b) is an explanatory view showing a state in which the volume of the pressure chamber is expanding. FIG. 8 is a relationship diagram showing a voltage waveform for driving a head of the inkjet recording apparatus of the present invention, a volume change behavior in a pressure chamber, and a meniscus behavior. FIG. 9 is a partially enlarged view of a main part of a head showing an embodiment of the present invention. FIG. 10 is a model diagram illustrating landing positions of main dots and satellite dots by the inkjet recording apparatus of the present invention. FIG. 11 is a structural explanatory view showing an example for correcting the landing positions of main dots and satellite dots by the ink jet recording apparatus of the present invention. FIG. 12 is a structural explanatory view showing an example for correcting the landing positions of main dots and satellite dots by the ink jet recording apparatus of the present invention. FIG. 13 is an explanatory diagram showing landing images of ink droplets by the conventional and the present invention. [Description of Signs] 1 Nozzle 2 Main dot 3 Satellite dot 10 Nozzle forming substrate 11 Flow path substrate 12 Pressure chamber 16 Base substrate 17 Pressure generating element

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) B41J 2/045 B41J 2/055 B41J 2/205

Claims (1)

  1. (57) [Claims] 1. A nozzle for discharging ink and a communication therewith
    Pressure chamber to generate pressure in this pressure chamber
    Element and a voltage applying means for applying a voltage to the pressure generating element.
    Having a step, wherein the pressure of the pressure generating element causes a
    Ink jet recording device that discharges ink from nozzles
    hand,Ink weight is the same The first pressure fluctuation
    Main dots as ejected ink droplets and residual pressure fluctuations
    Satellite, a droplet of ink ejected by vibration
    PitAnd are recorded as one pixel adjacent to each other.
    Direction resolution with main dots and satellite dots.
    解像度 resolution in the sub-scanning directionEspecially
    Inkjet recording device. 2. A main dot and a main dot discharged from the nozzle.
    The main scan is based on the angle of the satellite dots with respect to the nozzle surface.
    2. The ink jet according to claim 1, wherein the direction is different.
    Unit recording device. (3)Nozzle that ejects ink and communicates with it
    Pressure chamber to generate pressure in this pressure chamber
    Element and a voltage applying means for applying a voltage to the pressure generating element.
    Having a step, wherein the pressure of the pressure generating element varies with the ink
    Ink jet recording device that discharges ink from nozzles
    hand, This is the first ejected ink droplet generated by one pressure fluctuation. Me
    Vm (m / s)Residual vibration of pressure fluctuation
    Ejected ink dropletsSatellite dot
    Discharge speed Vs (m / s), main dot and satellite
    Ts (s), drive frequency f (Hz), nozzle
    Where G (m) is the distance between
    HelpThe main dot and the satellite
    That the ink weights of the cartridges are the sameCharacterized byRuiNku
    Jet recording device. (Equation 1) (4)Nozzle that ejects ink and communicates with it
    Pressure chamber to generate pressure in this pressure chamber
    Applying a voltage to the element and the pressure generating element Voltage application
    Having a step, wherein the pressure of the pressure generating element varies with the ink
    Ink jet recording device that discharges ink from nozzles
    hand, The pressure chamber expands due to pressure fluctuations of the pressure generating element.
    The ink is ejected from the nozzle by expanding and contracting
    The residual vibration due to the expansion of the pressure chamber is caused by the surface tension of the ink.
    Contraction of the pressure chamber after a point in time
    RowThe first discharge caused by one pressure change
    Main dots as ink droplets and residual vibration of pressure fluctuation
    Satellite dots, which are small droplets of ejected ink caused by
    That the ink weight ofFeaturesRuiNkuje
    Unit recording device. 5. A hole for holding the expansion of the pressure chamber.
    To make the printing time close to the natural oscillation period of the ink.
    Claims to be collected43. The ink jet recording apparatus according to claim 1. 6. The method according to claim 6, wherein a pressure change of said pressure generating element causes
    The ink is ejected from the nozzles by expanding and contracting the pressure chamber.
    From the pressure chamber and the expansion time of the pressure chamber.
    To reduce the contraction time to less than half of the natural oscillation period of the ink.
    Claims characterized4Or5Inkjet recording described in
    Recording device. 7.Nozzle that ejects ink and communicates with it
    Pressure chamber to generate pressure in this pressure chamber
    Element and a voltage applying means for applying a voltage to the pressure generating element.
    Having a step, wherein the pressure of the pressure generating element varies with the ink
    Ink jet recording device that discharges ink from nozzles
    hand, The first ejected ink droplet generated by one pressure change Me
    Residual pressure fluctuations after in-dot ejection cause the pressure chambers to rush.
    It is a vibration that contracts violently.Residual pressure fluctuation
    These are ink droplets that are ejected due to vibrationSatellited
    DispensingThe main dot and the sub dot.
    The same weight of ink for Terite dotsFeatures
    YouRuiLiquid jet recording device.
JP8066994A 1994-04-19 1994-04-19 Ink jet recording device Expired - Fee Related JP3500692B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8066994A JP3500692B2 (en) 1994-04-19 1994-04-19 Ink jet recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8066994A JP3500692B2 (en) 1994-04-19 1994-04-19 Ink jet recording device

Publications (2)

Publication Number Publication Date
JPH07285222A JPH07285222A (en) 1995-10-31
JP3500692B2 true JP3500692B2 (en) 2004-02-23

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Application Number Title Priority Date Filing Date
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JP (1) JP3500692B2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001322272A (en) 2000-05-17 2001-11-20 Brother Ind Ltd Ink jet recorder
EP1195249B1 (en) 2000-10-06 2005-12-21 Seiko Epson Corporation Method of driving ink jet recording head and ink jet recording apparatus incorporating the same
JP2002144570A (en) 2000-11-10 2002-05-21 Canon Inc Method of ejecting liquid drop, method of forming image, liquid jet apparatus and head
JP2002254625A (en) * 2001-03-05 2002-09-11 Ricoh Co Ltd Ink jet recording device
US7004555B2 (en) 2002-09-10 2006-02-28 Brother Kogyo Kabushiki Kaisha Apparatus for ejecting very small droplets
JP2005254579A (en) 2004-03-10 2005-09-22 Brother Ind Ltd Droplet jet apparatus
US7341333B2 (en) 2004-07-28 2008-03-11 Brother Kogyo Kabushiki Kaisha Apparatus for ejecting droplets
JP5534930B2 (en) * 2010-05-12 2014-07-02 大日本スクリーン製造株式会社 Inkjet printer and image recording method

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