JPH03277550A - Ink jet recording head and ink jet recording device therewith - Google Patents

Abstract

PURPOSE:To shorten time required for recovery of an ink surface and accelerate recording speed by providing a projecting part which deforms the ink surface in a liquid path between the discharge orifice and a drive source of an ink jet recording head. CONSTITUTION:After discharge of ink droplets from a discharge orifice 1 in the center, an ink surface 9 is deformed into a wave-like recessed surface by a projecting part 6c provided in a liquid path 2 between the discharge orifice 1 and a heater 5a which is a drive source. In addition, the ink surface is deformed into a wave-like recessed surface by a partition piece 26e provided in the liquid path 22 between the discharge orifice 21 and a heater 25a which is a drive source. After that, the ink surface advances in a different direction and again becomes a single ink surface after passing through the partition piece 26e. Subsequently, time required for the ink surface to return to a dischargeable state as a recovery time becomes short and therefore, the interval between discharge energy generations from the drive source can be made short to accelerate recording speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording head used in an inkjet recording device and its device. The present invention relates to an inkjet recording head suitable for on-demand inkjet recording and an inkjet recording apparatus equipped with the inkjet recording head.

[Prior Art] A conventional inkjet recording head includes an ejection port through which ink droplets are ejected, a liquid chamber that stores ink to be supplied to the ejection port, and a liquid path that communicates the ejection port and the liquid chamber. A driving source for applying ejection energy to the ink is provided at a portion of the liquid path. The drive source 1 may be a piezoelectric device that instantaneously applies ejection pressure to the ink, or a heater that is an electrothermal conversion port that applies ejection energy to the J-ink in order to heat and foam the ink.

Are the ejection port, liquid path and liquid chamber filled with ink? When the drive source applies ejection pressure to the ink in this state, ink droplets are separated from the ink surface formed at the tip of the ejection port and ejected.

After the ink droplet has been ejected, the ink surface contacts its periphery or the circumference of the liquid path due to a drop in pressure in the liquid path P, forming a curved surface, and moves inside the liquid path toward the driving hot water side. After being retracted, due to surface tension or the like, the ink supplied from the liquid chamber advances again to the tip of the ejection port. In this way, the ejection port and the liquid path are filled with ink again and return to a state in which ink can be ejected.

[Objectives to be Solved by the Invention] In the conventional inkjet recording head described above, the drive source directs the ejection energy to the liquid path after the ink droplets have been ejected, or before the ink surface returns to a state where it can be ejected again. If it is applied to the ink inside, the size of the ejected ink droplets will be uneven, resulting in an unsightly printed image.

Therefore, it is impossible to make the ejection energy generation interval of the drive source faster than the recovery time required for the ink surface to return to a dispensable state, and the recovery time limits the recording speed of the inkjet recording head. has been done.

Several methods have been tried in the past to shorten the recovery time, but problems remain in all of them.

For example, there is a method of increasing the ink pressure in the liquid chamber, but with this method, when no ejection is performed, ink overflows from the ejection port and wets the area around the tip of the ejection port, which may interfere with the next ejection. There is a problem with this.

Additionally, in the case of devices that use a piezo element as a drive source, there is a method of devising the waveform of the drive signal to generate discharge pressure, but this method has the problem that the recovery time cannot be shortened sufficiently. be.

Furthermore, in the case where an electrothermal converter is used as a driving source, there is a problem in that it is not possible to control the disappearing process of foamed ink bubbles.

The present invention has been made in view of the problems of the conventional techniques described above, and provides an inkjet recording head that can shorten the recovery time of the ink surface and has a high recording speed, and an inkjet recording device equipped with the inkjet recording head. The purpose is to provide a device.

[Means for Solving the Problems] An inkjet recording head of the present invention for achieving the above object includes: an ejection port through which ink droplets are ejected; a liquid path communicating with the ejection port for supplying ink; An inkjet recording head equipped with a drive source that applies ejection energy to ink provided in a path, characterized in that a protrusion that deforms the ink surface is provided in the liquid path between the ejection port and the drive source. A device characterized in that the protrusion protrudes into the liquid path without dividing the liquid path into a plurality of parts, and the protrusion is a partition piece that separates the liquid path into a plurality of parts. Some are characterized by certain things.

In some cases, the drive source is an electrothermal transducer that generates thermal energy to provide ejection energy to the ink.

Further, an inkjet recording apparatus of the present invention includes each of the above-mentioned inkjet recording heads.

[Function] In the inkjet recording head of the present invention configured as described above, the ink surface after the ink droplets are ejected is the same as that of the nine-sided protrusion provided in the liquid path between the ejection port and the drive source. When the ink surface reaches a certain point and retreats further, the ink surface is transformed by the protrusion from a curved surface with one large radius of curvature to multiple curved surfaces with smaller radii of curvature (hereinafter referred to as "wavy curved surface J"). .

Since this wavy curved surface is a curved surface having multiple smaller radii of curvature, the force of surface tension acting on the wavy curved surface in the opposite direction to the receding direction will cause the curved surface to have a larger shape than the curved surface when it is not deformed. Also, due to the energy loss when deformed, the receding speed of the waveform curved surface is reduced to a greater degree than the receding speed of the curved surface would be reduced if it were not deformed.

Even when the waveform curved surface stops retreating and moves forward toward the tip of the discharge port by changing direction, the force of surface tension acting on the waveform curved surface is large, so the advancing speed of the waveform curved surface is deformed. The forward speed of the curved surface is accelerated to a greater extent than it would be if it were not.

Therefore, the time required for the ink surface to move backward from the protrusion toward the driving source in the liquid path, change direction, move forward, and return to the protrusion is shorter than in the case without the protrusion. The overall recovery time of the ink surface is shortened.

[Example code] Embodiments of the present invention will be described based on the drawings.

First, a first example will be described.

In FIG. 1(^), the inkjet recording head of this embodiment is a laminate plate to which a heater board 5, a first photosensitive resin film pattern 6, a second photosensitive resin film pattern 7, and a top plate 8 are attached in order. The cut surface thereof serves as an ejection port surface 4 facing a recording medium (not shown).

The heater board 5 is made of a wafer, and a plurality of heaters 5a, which are electrothermal converters, are provided in parallel at predetermined intervals on the surface of the heater board 5 by a thin film process. Each heater 5a serves as a driving source that provides ejection energy to ink.

To explain the shape of the first photosensitive resin film pattern 6 pasted on the heater board 5, a pair of first liquid path walls 6a, 6 are provided on both sides of each heater 5a.
b are formed so as to face each other with a width a apart, and in a direction perpendicular to the discharge port surface 4, one extends to the liquid chamber 3 located at the upper right in the figure, and the other extends to the discharge port surface 4. distance jll
They each extend with the same width to the position left by c. The pair of first liquid passage walls 6a, 6b are bent to approach each other at the position of the distance C, and at a position where a distance d remains from the discharge port surface 4, the width thereof is decreased until the width of the pair is wide. They have reached dead end walls 6c and 6d, respectively.

The heater 5 is inserted between the pair of dead-end walls 6c and 6d of the front three.
A rectangular parallelepiped-shaped protrusion 6e is formed in a direction perpendicular to the discharge port surface 4 toward the direction a and extends with a width e from the discharge port surface 4 to a position at a distance f.

The pair of first liquid path walls 6a, 6b, the pair of dead walls 6c, 6d, and the protrusion 6e described above are each formed in the same shape corresponding to each heater 5a.

Next, the shape of the second photosensitive resin film pattern 7 pasted on the first photosensitive resin film pattern 6 will be explained.
A pair of second liquid passage walls 7g and 7b are formed so as to be flush with each of b. However, this pair of second liquid path walls 7a.

7b are bent so as to approach each other at a position where a distance g slightly shorter than distance C is left to the discharge port surface 4, and at a position where a distance g slightly shorter than distance 111d is left to the discharge port surface 4, its width is reduced to the width of the front J. The discharge port walls 7c and 7d are respectively connected to a pair of discharge port walls 7c and 7d.

The pair of discharge port walls 7c and 7d each have a discharge port surface 4.
perpendicular to the discharge port surface 4 from the position of the distance @h.
They face each other with the width apart between them.

The pair of second liquid passage walls 7a, 7b and the pair of discharge port walls 7c, 7d described above are formed in the same shape corresponding to each heater 5a, respectively.

Said 21st! ! By pasting a glass top plate 8 on top of the photoresin film pattern 7, a plurality of discharge ports 1 and a plurality of liquid channels 2 are formed. Each outlet 1 of 4
The wall is composed of a first photosensitive resin film pattern 6, a pair of discharge port walls 7c and 7d, and a top plate 8. The plurality of walls of each liquid path 2 are composed of a heater board 5 and a pair of first Liquid path wall 6a.

6b, a pair of second liquid path walls 7a and 7b, and a top plate 8. Further, the top plate 8 is provided with an ink supply path (not shown) that supplies ink to the liquid chamber 3.

Said first and second photosensitive resin film patterns 6.7
Each of the above-mentioned shapes is formed by the following method. After the first photosensitive resin film pattern 6 is pasted on the Peter board 5, its surface is exposed to light using a negative image photomask having the shape described above, and then the first photosensitive resin film pattern 6 is After the second photosensitive resin film pattern 7 is pasted on the surface, the surface thereof is exposed to light using a negative image photomask having the shape described above, and then the first and second photosensitive resin film patterns 6.7 are applied simultaneously. It is developed, and the unexposed areas are dissolved away, leaving behind the respective shapes described above.

In FIG. 1(B), the ink surface 9 that retreats in the liquid path 2 after an ink droplet is ejected from the ejection port 1 at the center on the left side in the figure will be described.

The ink surface 9 has an ejection port 1 and a heater 5a which is a driving source.
When the projection 6e provided in the liquid path 2 between the transformed into. The ink surface 9 shown by a dashed line in the figure shows the shape of a cross section of the waveform curved surface, and the curved surface near the protrusion 6e has a short receding distance from the ejection port surface 4 and resembles the shape of number 3. It is something like this.

Next, a second embodiment will be explained.

In FIG. 2(^), the inkjet recording head of this embodiment is composed of a laminate plate to which a heater board 25, a photosensitive resin film pattern 26 and a top plate 28 are attached in order, and is different from the first embodiment. Differently, the S photoresin film pattern 26 is only one layer.

To explain the shape of the photosensitive resin film pattern 26, a pair of liquid path walls 26a and 26b are formed on both sides of each heater 25a so as to face each other with a radius JLJ11, and are perpendicular to the discharge port surface 24. In this direction, one side extends to the liquid chamber 23 located at the upper right in the figure, and the other side extends to the discharge port surface 24 with the same width. The pair of liquid path walls 26a and 26b are bent so as to approach each other at the distance n,
At a position where a distance of 0 remains to the discharge port surface 24, the width thereof is reduced to a width m and is continuous with a pair of discharge port walls 26c and 26d, respectively.

The pair of discharge port walls 26c and 26d are each perpendicular to the discharge port surface 24, and are opposed to each other from the position of the path 111° to the discharge port surface 24, separated by the width m.

Near the bent portions of the pair of liquid path walls 26a, 26b, a rectangular parallelepiped shape having a width p narrower than the width m and a length r is located at the center between the pair of liquid path walls 26a, 26b. The partition piece 26e is formed with its longitudinal direction perpendicular to the discharge port surface 24. Discharge port surface 2 of the partition piece 26e
One end of the fourth side is located at a distance g, which is appropriately longer than the distance O, to the discharge port surface 24.

The pair of liquid path walls 26a, 26b, the pair of discharge port walls 26c, 26d, and the partition piece 26e described above are each formed in the same shape corresponding to each heater 25a.

By pasting the top plate 28 on the photosensitive resin film pattern 26, a plurality of discharge ports 21 and a plurality of liquid channels 22 are formed. The four walls of each discharge port 21 are composed of a heater board 25, a pair of discharge ports fi26c and 26d, and a top plate 28, and the plurality of walls of each liquid path 22 are composed of a heater board 25, a pair of discharge ports fi26c and 26d, and a top plate 28. liquid path wall 26a, 2
6b and a top plate 28. However, each liquid path 22 has a portion where the partition piece 26e is formed.
It is separated into two routes.

Since the configuration other than those described above is the same as that of the first embodiment, the explanation thereof will be omitted.

In FIG. 2(B), the ink surface that retreats in the liquid path 22 after an ink droplet is ejected from the ejection port 21 at the center on the left side of the figure will be described.

The ink surface has an ejection port 21 and a heater 25 which is a driving source.
When it approaches the partition piece 26e provided in the liquid path 22 between the liquid path 22 and the liquid path 22a, and when it retreats further, it is transformed into a wave-shaped curved surface by the partition piece 26e, and then the two ink surfaces 29a, 29
b, and are further retreated into the two separated liquid paths 22, respectively. Then change direction and move forward,
After passing the partition piece 26e, the surface becomes one ink surface again.

Regarding the effects of this embodiment, the recovery time of the ink surface of an inkjet recording head is generally shorter when the amount of ink ejected is small compared to when the amount of ink is ejected is large, but the recovery time of the ink surface of this embodiment is , the amount of ink ejected in this embodiment is about the same as that of a conventional inkjet recording head, which is smaller, and the length is shorter.

Also, when comparing the effects of this example and the first example,
In the case of a configuration in which the partition piece 26e separates the liquid path 22 into two paths as in the present embodiment, each radius of curvature of the waveform curved surface is is smaller and the recovery time of the ink surface is shorter. On the other hand, when the separation is not complete as in the first embodiment, the resistance of the liquid path due to the protrusion is smaller than in the case of complete separation as in the present embodiment, so the loss of discharge pressure is small and the discharge This method has the advantage that the speed of the ink droplets is fast, and the amount of ink ejected is also large.

Next, a third embodiment will be explained.

In FIG. 3(A), the inkjet recording head of this embodiment consists of a laminated plate to which a Peter board 35, a photosensitive resin film pattern 36, and an orifice plate 38 are adhered in order.

The heater hoard 35 is made of a silicon wafer,
On the surface of this heater hoard 35, a plurality of U-shaped heaters 35a, which are electrothermal converters, are provided in parallel at predetermined intervals using a thin film process, and serve as a driving source that provides ejection energy to the ink. ing.

Further, support members 35b, 35c are provided on the edge of the surface of the heater board 35 opposite to the surface on which each heater 35a is provided.
is fixed to the liquid chamber 33, and forms a part of the wall constituting the liquid chamber 33.

The second liquid path 32b provided in the heater boat 35 is
It is a hole having a long shape extending parallel to the direction in which the heaters 35a are arranged in parallel at an appropriate distance from the heater 35a,
The liquid chambers 3 are located on both sides of the heater board 35.
3 and the first liquid path 32a are communicated with each other.

The first liquid path 32 a is surrounded by a heater port 35 , a plurality of walls formed in a photosensitive resin film pattern 36 , and an orifice plate 38 .

Here, the shapes of the plurality of walls formed in the photosensitive resin film pattern 36 will be explained. Cylindrical protrusions 36e are formed at the inner bottoms of the U-shapes of each of the heaters 35a, and the four walls of the heater wall 36e surround a thin rectangular parallelepiped space with each protrusion 36e in the center. Two walls are formed around each heater 35a. One wall of the heater wall 36a on the second liquid path 32b side is separated at the center and continuous with the pair of passage walls 36c and 36d, respectively.

The pair of passage walls 36c and 36d are formed to face each other in parallel, and are connected to the second liquid passage 32 from the separated wall.
After extending an appropriate length toward b, the first passage wall 36
Each is consecutive to b.

The first passage wall 36b is formed parallel to the longitudinal direction of the second liquid passage 32b, and faces the first passage wall in parallel with the second liquid passage 32b interposed therebetween.

The protrusion 36e, the heater 35a, and the pair of entrance walls 36c, 36d described above are formed in the same shape corresponding to each heater 35a, and each pair of entrance walls 36c, 36d communicates the space surrounded by each heater section wall 36a with the space surrounded by the first and second passage walls 36b and 36f, respectively.

The aforementioned shape of the photosensitive resin film pattern 36 is formed by a method similar to that described in the first embodiment.

The orifice plate 38 pasted on the photosensitive resin film pattern 36 is made of nickel and formed by electroforming.

At positions corresponding to the projections 36e of the cylinder of the orifice plate 38, discharge ports 31 each having a circular opening are formed with their center lines aligned with the center lines of the projections 36e. The inner diameter of each discharge port 31 gradually increases as it approaches the protrusion 36e, and its cross-sectional shape is V-shaped as shown in FIG. 3(B).

Further, the upper surface of the orifice plate 38 in the drawing serves as an ejection port surface 34 facing a recording medium (not shown).

In FIG. 3(B), the ink surface 39 that retreats in the first liquid path after the ink droplets are ejected upward in the figure from the ejection port 31 will be described.

The ink surface 39 approaches a cylindrical protrusion 36e provided in the first liquid path 32a between the ejection port 31 and the heater 35a, which is a driving source, and when retreating further downward in the figure, the ink surface 39 approaches the protrusion 36e. The annular curved surface is deformed into a wavy curved surface, and the annular curved surface, leaving the central portion, is further retreated toward the heater 35a. Thereafter, it changes direction and moves forward toward the discharge port 31.

In each of the embodiments described above, an example is shown in which a heater, which is an electrothermal transducer, is used as a driving source, but the invention is not limited to these, and it is also possible to similarly implement an example in which a piezo element or the like is used as a driving source. Needless to say. Further, the plurality of ejection ports in each embodiment may be formed over the entire width of the recording area of the recording medium to form a full-line type inkjet recording head.

FIG. 4 is a perspective view showing an embodiment of the inkjet recording apparatus of the present invention, in which one of the embodiments of the inkjet recording head of the present invention described above is used as the inkjet recording head 110 of the present embodiment. There is.

In the inkjet recording device W1108, a carriage 111 equipped with an inkjet head cartridge 109 that integrates the inkjet recording head 110 and an ink tank (not shown) is a part of a drive belt 1!2 that transmits the driving force of a drive motor 113. Two guide shafts 114A, 1 connected to and arranged parallel to each other.
14B so that the inkjet recording head 110 faces the ejection opening surface of the inkjet recording head 110 due to the driving force of the drive motor 113. The apparatus is configured to reciprocate over the entire width of the recording paper, which is a recording medium fed from the apparatus onto the platen 115, to perform recording on the recording paper.

In addition, the inkjet recording apparatus 108 of the present embodiment is configured such that the inkjet recording head 110 is moved by a distance M (of the guide shaft 114A in the figure) during the head recovery operation, outside the range of reciprocating movement of the inkjet recording head 110 during the recording operation. At the left end (hereinafter referred to as the recovery position), the inkjet recording head 1 is driven by the driving force of the motor 118 via the transmission mechanism 119, facing the ejection orifice surface of the inkjet recording head 110.
A cap portion 116A that caps the discharge port surface of No. 10
A head recovery device 116 is provided. During head recovery operation, this head recovery device M116 performs ink suction using an appropriate suction means or an inkjet recording spatula in connection with capping of the ejection port surface of the inkjet recording head 110 by the cap portion 116A.
The ink is force-fed by a suitable pressurizing means provided on the ink supply path to the nozzle 110, and the ink is forcibly discharged from the ejection port, thereby performing an ejection recovery operation such as removing thickened ink within the nozzle.

Furthermore, a blade 117 as a wiping member made of silicone rubber is provided on the side surface of the head recovery device 116.
is held in a cantilever form by the plate holding part 117A, and like the head recovery device M116, the motor 118
and a transmission mechanism 119 to enable engagement with the ejection orifice surface of the inkjet recording head 110. As a result, after the ejection recovery operation using the head recovery device 116, the plate 117 is moved to the inkjet recording head 11.
The head 110 protrudes into the movement path of the inkjet recording head 110, and wipes off condensation, moisture, dust, etc. on the ejection port surface of the inkjet recording head 110 as the inkjet recording head 110 moves.

The inkjet recording device 108 described above receives data such as document information, control commands, etc. manually entered from a keyboard (not shown) via a main body (not shown) and an interface cable (not shown) at a print control unit (not shown). A series of document information recording operations and the aforementioned head recovery operations are performed according to the data.

In this embodiment, one of the embodiments of the inkjet recording head of the present invention described above is used, so that the scanning speed of the inkjet recording head can be increased.

Alternatively, a plurality of inkjet recording heads 110 of this embodiment may be provided, and each inkjet recording head may eject ink of a specific color to perform color recording.

As described above, the present invention brings about excellent effects particularly in inkjet recording heads and inkjet recording apparatuses of bubble jet type among inkjet recording types.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. Is this method applicable to both the so-called on-demand type and continuous type? In particular, in the case of the on-demand type, it is necessary to place the liquid (ink) in accordance with the sheet and liquid path where it is held. By applying at least one drive signal that corresponds to recorded information to the electrothermal transducer that is being used and that causes a rapid temperature rise that exceeds nucleate boiling, the electrothermal transducer generates thermal energy and performs inkjet recording. This is effective because it causes film boiling on the heat acting surface of the head, resulting in the formation of bubbles in the liquid (ink) in one-to-one correspondence with this drive signal. The growth and contraction of the bubble causes liquid (ink) to be ejected through the ejection opening to form at least three droplets. It is more preferable to use this drive signal in a pulse form, since the growth and contraction of bubbles can be carried out immediately and appropriately, so that ejection of liquid (ink) with particularly excellent responsiveness can be achieved. This pulse-shaped drive signal is described in U.S. Pat. Nos. 4,463,359 and 434.
5262 is suitable. Further, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

The structure of the inkjet recording head includes, in addition to the combination structure of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications. It is also effective for the configurations disclosed in US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose configurations in which the portion is disposed in a bending region. In addition, Japanese Patent Application Laid-open No. 123670 of 1982 discloses a configuration in which a common slit is used as a discharge part for a plurality of electrothermal converters, and a hole that absorbs pressure waves of thermal energy is disclosed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 138461 of 1982, which discloses a configuration in which the discharge portion corresponds to the discharge portion.

In addition, a replaceable chip-type inkjet recording head that is installed in the device body enables electrical connection with the device body and supply of ink from the device body.
Alternatively, the present invention is also effective when using a cartridge type inkjet recording head that is integrally provided with the inkjet recording head itself.

Further, it is preferable to add recovery means, preliminary auxiliary means, etc. for the inkjet recording head, which are provided as a configuration of the inkjet recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specifically, for inkjet recording heads,
Caving means, cleaning means, pressurizing or suction means, preheating means using an electrothermal converter or another heating element, or a combination thereof, and performing a preliminary ejection mode in which ejection is performed separately from recording. It is also effective for stable recording.

Furthermore, the recording mode of the inkjet recording device is not limited to the recording mode of only mainstream colors such as black, but also the inkjet recording head may be configured integrally or by combining multiple inkjet recording heads, but it is also possible to use multiple colors of different colors or mixed colors. The present invention is also extremely effective for devices equipped with at least one full color image.

In the embodiments of the present invention described above, the ink is explained as a liquid, but it is an ink that solidifies at room temperature or lower, and is softened or liquid at room temperature, or in the above-mentioned inkjet, the ink itself is heated at 30°C. Generally, the temperature is adjusted within the range of 70℃ or less so that the viscosity of the ink is within the stable discharge range, so if the ink is in a liquid state when the recording signal is applied, then good.

In addition, the temperature rise caused by thermal energy can be actively prevented by using the energy to change the state of the ink from a solid state to a liquid state, or an ink that solidifies when left standing is used to prevent ink evaporation. In any case, the ink is liquefied by applying thermal energy in accordance with the J self-recorded signal and is ejected as liquid ink, or the ink has already begun to solidify by the time it reaches the recording medium. The use of ink that is liquefied only by thermal energy is also applicable to the present invention. In such a case, the ink may be ink as described in Japanese Patent Application Laid-Open No. 54-56847 or Japanese Patent Application Laid-Open No. 60-71260.
The porous sheet may be held as a liquid or solid in the recesses or through-holes of the porous sheet, and may face the electrothermal converter. In the present invention, the most effective method for each of the above-mentioned inks is to implement the above-mentioned film boiling method.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

The recovery time for the ink surface to return to a state where it can be ejected after an ink droplet has been ejected is shortened, which makes it possible to narrow the interval between the generation of ejection energy from the drive source, and as a result, the inkjet The recording speed of the recording head can be increased.

If the protrusion is a partition piece that separates the liquid path into a plurality of parts, the recovery time will be shorter and it will be more effective.

Furthermore, in an inkjet recording apparatus using the inkjet recording head, the scanning speed of the inkjet recording head during recording can be increased, and the recording time of the inkjet recording apparatus can be shortened.

[Brief explanation of the drawing]

FIGS. 1(A) and 1(B) show a first embodiment of the present invention, and (
A) is a sectional perspective view of the main part, (B) is a sectional view of the main part,
Figures (A) and (B) show a second embodiment of the present invention, and (A)
is a sectional perspective view of the main part, (B) is a sectional view of the main part, and Fig. 3 (
A) and (B) show a third embodiment of the present invention, (A> is a sectional perspective view of the main part, (B) is a sectional view of the main part, and FIG. 4 is an embodiment of the inkjet recording apparatus of the present invention. A perspective view of the main parts of the example. 1.21.31--discharge port, 2.22--liquid path, 3
2 a---First liquid path, 32 b---Second liquid path, 3.23.33---Liquid chamber, 4.24.34---Discharge port surface, 5.25.35... - Heater hoard, 5a, 25a, 35a--Peter, 35b, 35c-Holding member, 6...First photosensitive resin film pattern, 6a, 6b
-・First liquid path, 6c, 6d-・Dead wall 6e, 36
e-protrusion, 26 e-partition piece, 26. 36--photosensitive resin film pattern, 26a, 26 b--liquid path wall, 7c, 7d, 26c, 26 d--discharge port wall, 36
a = heater section wall, 36 b--first passage wall, 36c, 36 d--passageway wall, 36 f--second passage wall, 7... second photosensitive resin film pattern, 7a ,7
b--Second liquid path wall, 8.28--Top plate, 38--Orifice plate, 108--Inkjet recording device, 109--Inkjet head cartridge, 110--Inkjet recording head, 11 ... Carriage, 112-- Drive belt, 113-- Drive motor, 11
4A, 114B--Guide shaft, 115--Platen, 116--Head recovery device, 6A--Cap portion, 18--Motor, 117--Plate, 119--Transmission mechanism.

Claims (1)

[Scope of Claims] 1. A device comprising: an ejection port through which ink droplets are ejected; a liquid path communicating with the ejection port for supplying ink; and a drive source provided in the liquid path that applies ejection energy to the ink. An inkjet recording head characterized in that a protrusion that deforms an ink surface is provided in a liquid path between the ejection port and the drive source. 2. The inkjet recording head according to claim 1, wherein the protrusion protrudes into the liquid path without dividing the liquid path into a plurality of parts. 3. The inkjet recording head according to claim 1, wherein the protrusion is a partition piece that separates the liquid path into a plurality of parts. 4. The inkjet recording head according to any one of claims 1 to 3, wherein the drive source is an electrothermal transducer that provides ejection energy to the ink by generating thermal energy. 5. An inkjet recording apparatus comprising the inkjet recording head according to claim 1, 2, 3 or 4.