JPH1148480A - Inkjet recording head - Google Patents

Abstract

(57) [Abstract] (with correction) [PROBLEMS] An ink jet recording head suitable for a long print with high ejection performance, which suppresses the fluctuation of ink in a common liquid chamber, reduces deflection and unevenness due to crosstalk. A substrate provided with an ejection energy generating element for applying ejection energy to the ink, the substrate corresponding to each of the plurality of ink flow paths; a groove corresponding to the ink flow path;
An orifice plate provided with a discharge port through which ink is discharged in communication with one end of the groove has a top plate member 400 integrated with the orifice plate. Inside the top plate member 400, a hole communicating with the common liquid chamber 411 is provided. A top plate supporting member 415 made of a formed stainless steel pipe is provided along the direction in which the ink flow path 412 is arranged, and a separation wall 416 formed by a wall that is not joined to the ink flow path 412 is formed in the common liquid chamber 411. Separation wall 416
Thus, the chamber is separated into a plurality of small chambers corresponding to the holes communicating with the common liquid chamber 411 of the stainless steel pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording head for performing recording by discharging a recording liquid from a discharge port.

[0002]

2. Description of the Related Art An ink jet recording method is a method of performing recording by discharging droplets (ink) from a fine discharge port onto a recording medium. Since it is a non-impact recording method, there is no fear of noise. It has the advantages that plain paper can be used, high-speed, high-definition recording is possible, and that color recording is enabled by using a plurality of color inks. In a recording apparatus (inkjet recording apparatus) using an inkjet recording method, generally,
An inkjet recording head (IJC) is used in which an ejection port from which ink is ejected and an ejection energy generating element for giving ejection energy to the ink are integrated.

[0003] The heater board 100 includes a silicon substrate,
Electrothermal transducers (discharge heaters) arranged in a row on a silicon substrate and electrical wiring of aluminum or the like for supplying power thereto are formed by a film forming technique. A wiring board 200 for the heater board 100 is provided,
Wiring corresponding to the wiring of the heater board 100 (for example, connected by wire bonding) is provided on the wiring board 200.
A pad 201 located at one end of the wiring and receiving an electric signal from a main unit (not shown) and a signal / power supply pad located at the other end of the wiring and serving as an electrical connection portion with the heater board are provided. Have been.

[0004] An ink receiving port 415 for receiving ink supplied from an ink tank and introducing it into a common liquid chamber described later, and an orifice plate 403 having a plurality of discharge ports corresponding to each ink flow path are integrally formed by injection molding or the like. Thus, the grooved top plate 400 is configured. This grooved top plate 400
Are provided with a partition for partitioning a plurality of ink flow paths, a common liquid chamber for storing ink for supplying ink to each ink flow path, and the like. Grooved top plate 4
In 00, the ink flow path is formed as a groove. Examples of these integrally molded materials include polysulfone. On the back side of the wiring board 200, a support 300 that supports the wiring board 200 in a plane is arranged. The support 300 is made of, for example, metal and serves as a bottom plate of the inkjet unit.

The heater board 100 and the support 300
The grooved top plate 400 is fixed to the pressing spring 500 by pressing force. The pressing spring 500 generates a pressing force in a U-shape, and the pressing force uniformly presses the arrangement direction of the grooves as the ink flow paths. That is, the presser spring 500 has its legs 510 passing through the holes 310 of the support 300 and engaging with the back side of the support 300, thereby holding the heater board 100 and the grooved top plate 400 in a sandwiched state. The engagement of the pressing spring 50
Heater board 1 by the concentrated biasing force of 0 and its front part
00 and the grooved top plate 400 are fixed by crimping. The mounting of the wiring board 200 to the support 300 is performed by sticking with an adhesive or the like. In this way, the grooved top plate 4
00 and the heater board 100, an ink flow path is finally completed by the groove of the grooved top plate 400 and the heater board 100. The end of the heater board 100 is vertically abutted against the surface on the back side of the orifice plate 403, so that no gap is formed between the grooved top plate 400 and the heater board 100.

[0006]

However, in the ink jet recording head as described above,
When a large number of discharge ports (for example, 1000 or more) are provided to increase the size, the common liquid chamber provided on the grooved top plate becomes too large in the discharge port arrangement direction, and the ink in the common liquid chamber becomes too large. The swing causes the following problem. That is, bubbles in the liquid chamber are eliminated, and ink circulation in the recovery operation can be eliminated by flowing ink through a stainless steel pipe provided inside the top plate member and having a hole communicating with the common liquid chamber. However, the occurrence of crosstalk due to the swinging of the ink in the common liquid chamber when discharging the ink,
Preventing the generation of bubbles or the like due to the ink swing itself cannot be eliminated by such means. Such a swing of the ink in the common liquid chamber causes the print to be distorted or uneven, and the occurrence of bubbles causes non-ejection of the ink or ink drop.
Eliminating the fluctuation of the ink in the common liquid chamber is an important issue when increasing the size of the ink jet recording head.

Accordingly, the present invention solves the above-mentioned problem relating to the swing of the ink in the common liquid chamber, and particularly solves the problem of the ink in the common liquid chamber when a large number (for example, 1000 or more) of ink ejection ports are provided. It is an object of the present invention to provide an ink jet recording head that suppresses swinging, reduces deflection and unevenness due to crosstalk, and has a high ejection performance and is suitable for a long print.

[0008]

According to the present invention, in order to solve the above-mentioned problems, an ink jet recording head is constituted as follows. That is, the ink jet recording head of the present invention has a substrate in which ejection energy generating elements for applying ejection energy to ink are provided corresponding to a plurality of ink flow paths, a groove corresponding to the ink flow path, An orifice plate provided with a discharge port from which ink is discharged in communication with one end has a top plate member integrated with the orifice plate, and the ink flow path is formed by joining the substrate and the top plate member, In the ink jet recording head which performs printing by discharging ink from the ink flow path corresponding to the discharge energy generating element, inside the top plate member, a stainless steel pipe having a hole communicating with a common liquid chamber is formed. A top plate supporting member is provided along the ink flow path arrangement direction, and the common liquid chamber has a wall portion that is not joined to the ink flow path. Hanarekabe is formed, it is characterized in that it is separated into a plurality of small sections corresponding to the common liquid chamber and the bore that communicates the stainless steel pipe by the separation wall. Also,
In the inkjet recording head of the present invention, the common liquid chamber is separated into a liquid chamber for ink circulation and a liquid chamber for ink discharge by a separation wall extending in an ink discharge arrangement direction, and a plurality of liquid chambers formed on the separation wall are formed. It is characterized in that these two liquid chambers are communicated by a slit. Further, the ink jet recording head according to the present invention is characterized in that the orifice plate is provided with a large number of ejection ports, for example, 1000 or more ejection ports, so as to be large.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the ink jet recording head of the present invention will be described in more detail. The ink jet recording head comprises: a substrate provided with an ejection energy generating element for applying ejection energy to ink; A top plate member integrally formed with a groove corresponding to an ink flow path and an orifice provided with a discharge port through which ink is discharged in communication with one end of the groove. The ink flow path is formed by joining with a plate member, and at the time of the joining, an end surface of the substrate abuts and an abutting surface facing a direction different from the joining direction is formed on the top plate member. In the ink jet recording head, the abutting surface and the surface of the orifice plate and the ink flow channel groove forming surface in which the groove is formed,
It is formed by simultaneous cutting. The ink jet recording head of the present invention has a configuration in which the ink in the common liquid chamber provided on the top plate member is prevented from swinging when the ink is ejected from the ink ejection port.

The top plate member of the ink jet recording head of the present invention is desirably made of resin from the viewpoint of ease of molding and the like. The top plate member of the ink jet recording head of the present invention includes a common liquid chamber communicating with the ink ejection port, and a stainless steel plate having a hole communicating with the common liquid chamber formed inside the top plate member. A pipe (hereinafter, referred to as a SUS pipe) is insert-molded into the top plate member to control the coefficient of thermal expansion of the top plate member. The common liquid chamber is provided with a separation wall having a shape not joined to the front ink flow path, and the common liquid chamber is separated into a plurality of small chambers by the separation wall. The present invention
For example, the ink is swayed in the common liquid chamber when the ink is ejected by separating walls into small rooms corresponding to holes of at least three or more SUS pipes by separating walls perpendicular to the nozzle arrangement direction. Can be suppressed, crosstalk can be suppressed, deflection and unevenness can be reduced, and generation of bubbles due to ink swing can be eliminated, and non-ejection and ink drop can be eliminated. The present invention also provides a liquid chamber for ink circulation and a liquid chamber for ink discharge by a separation wall extending in an ink discharge arrangement direction, and a plurality of slits formed in the separation wall to form the two liquid chambers. Can be prevented from being transmitted directly to the ink flow path at the time of ink circulation, and even when bubbles are generated in the liquid chamber during ink ejection, It is possible to perform a recovery operation by circulating the ink without stopping printing.

[0011]

Embodiments of the present invention will be described below. [Embodiment 1] FIG. 1 is a schematic perspective view showing the configuration of an ink jet recording head using a grooved top plate obtained by performing a cutting process and further providing a discharge port and an ink flow channel. FIG. 2 is a diagram illustrating the configuration of main components of the ink jet recording head. Here, the density of the ink ejection ports is 360 dpi (360 per 25.4 mm, that is, the interval is 70.5 μm), and the number of ink ejection ports is 300.
Eight inkjet recording heads (print width 212 mm) will be described. Since there are 3008 ink ejection ports, at least 3008 ejection energy generating elements are required.
Board (substrate) 1 having 128 pieces each
By preparing a plurality of 00s and arranging them on a straight line,
A predetermined number of ejection energy generating elements are ensured. In each of the heater boards 100, 128 ejection energy generating elements 101 are provided at predetermined positions at a density of 360 dpi, and are used to drive the ejection energy generating elements 101 at an arbitrary timing by an external electric signal. It has a pad 102 for supplying signals, driving power, and the like. Each heater board 100 has a support (base plate) 300 made of stainless steel.
And fixed by an adhesive.

FIG. 4 is a detailed view showing a state where the heater boards 100 are arranged. Each heater board 100 includes a support 30
The adhesive 30 applied at a predetermined location at a predetermined thickness
1 and fixed by adhesive. At this time, between two adjacent heater boards 100, a discharge energy generating element on one heater board and closest to the other heater board, and a discharge energy generating element on the other heater board and closest to one heater board The pitch between the energy generating elements is the same as the pitch P (= 70.5 μm) of the ejection energy generating elements 101 on each heater board 100. Therefore, even if 20 or more heater boards 100 are provided, the entire heater board 100
The ejection energy generating elements 101 are arranged at the same pitch P. At this time, the adjacent heater board 1
There is a gap between the two, and the gap is sealed by the sealant 302.

As the discharge energy generating element 101, specifically, an electrothermal converter which generates heat when energized according to a recording signal is used. Discharge energy generating element 1
01 is formed on the heater board 100 which is a silicon substrate by using a semiconductor device manufacturing technique. And
When the discharge energy generating element 101 generates heat by energization, the ink in the ink flow path corresponding to the discharge energy generating element is heated and foams, and the ink in the ink flow path is discharged from the discharge port by the energy of the foaming. It will be ejected as a drop. This foaming is preferably due to film boiling. As the ejection energy generating element 101, an element composed of a piezoelectric element can be used.

Returning to FIG. 2, a wiring board 200 is also adhered to the support 300. Wiring board 2
00 is for supplying a signal or power to each heater board 100, and a pad 102 on the heater board 100 and a signal / power supply pad 202 provided on the wiring board 200 have a predetermined positional relationship. The wiring substrate 200 is arranged such that A connector 201 to which a print signal or drive power is externally supplied is provided at an end of the wiring board 200 which is not on the heater board 100 side.

Next, the grooved top plate 400 will be described. First, the top plate is formed by simultaneously cutting the orifice plate surface (discharge port surface), the ink flow channel groove forming surface, and the heater board joint surface (butting surface) after the resin molding. Then, on the surface of the orifice plate, in order to prevent the ejection performance from being lowered due to the orifice peripheral portion being wet by the ink,
An ink-repellent film is formed. After that, by excavating the ink channel groove forming surface with excimer laser,
An ink channel groove corresponding to each of the ejection energy generating elements 101 of the heater board 100 is formed. The processing by the laser beam is performed by using a mask and repeating the processing in units of 128 channels in the same manner as the unit of the heater board. After the ink flow channel processing, a discharge port (orifice) is perforated by a laser beam using a mask from the back surface of the orifice plate at one end of each ink flow channel in a unit of 128 in the same manner as the ink flow channel. Thus, the grooved top plate 400 is finally completed.

As shown in FIG. 5, the grooved top plate 400
The ink flow paths 412 provided corresponding to the discharge energy generating elements 101 provided on the heater board 100, and communicate with the ink flow paths 412 corresponding to the respective ink flow paths 412 for discharging ink toward the recording medium. Orifice (ejection port) 413, a liquid chamber 411 communicating with each ink flow path to supply ink to each ink flow path 412,
A component such as an ink supply port 414 through which ink supplied from an ink tank (not shown) flows into the liquid chamber 411 is integrally provided. Naturally, the grooved top plate 400 has a length that substantially covers the ejection energy generating element array provided with a plurality of heater boards 100 arranged side by side.

Here, as shown in FIG.
00 common liquid chambers 411 are separated by separation walls 416, and each small chamber is provided in the same number corresponding to the hole 414 of the SUS pipe. The separation wall 416 is used for the ink flow path 4.
In practice, each compartment is not completely separated because it has a shape that does not join to 12. And
As shown in FIG. 5, the grooved top plate 400 is
12 and heater board 100 arranged on support 300
It is coupled to the support 300 so that the positional relationship with the upper ejection energy generating element is a predetermined positional relationship. As a method of this connection, there are various methods such as a method of mechanically pressing with the spring 500 and the spring holder 510 holding the spring 500, a method of fixing with an adhesive, and a method of using these methods together. . FIG. 6 shows the support 3
FIG. 7 is a schematic diagram showing a positional relationship between a heater board 100 and a grooved top plate 400.

As a material for forming the grooved top plate 400,
In order to provide ink flow grooves and discharge ports, a resin capable of accurately forming grooves is preferable, and furthermore, mechanical strength, dimensional stability,
It is desirable that the ink has excellent ink resistance. As such a material, for example, an epoxy resin, an acrylic resin, a diglycol dialkyl carbonate resin, an unsaturated polyester resin, a polyurethane resin, a polyimide resin, a melamine resin, a phenol resin, a urea resin, and the like are preferable. Resins such as phones are desirable from the viewpoint of moldability and liquid resistance. When the grooved top plate 400 is made of resin, its linear thermal expansion coefficient is about 1 × 10 ⁻⁵ / ° C. to 1 × 10 ⁻⁴ / ° C. Here, polysulfone (linear thermal expansion coefficient: 56 × 10 ^-6 / ° C)
The following description is based on the assumption that On the other hand, the heater board 100 as a substrate is formed of a silicon substrate, and has a linear thermal expansion coefficient of 2.4 × 10 ⁻⁶ / ° C. The support 300 on which the heater boards 100 are arranged is made of stainless steel, and has a linear thermal expansion coefficient of 17.3 × 10 ⁻⁶ / ° C. Here, it is assumed that the recording head has been assembled at a temperature near 25 ° C. It is quite possible that the temperature of the assembled recording head rises to about 60 ° C. during its operation. Therefore, in the configuration as described above, assuming that the assembly is accurately assembled at 25 ° C., and calculating the shift at 60 ° C. due to the difference in the expansion coefficient, [Formula 1] 3008 nozzle × 0.0705 (pitch) × (60-2
5) × (56 × 10 ⁻⁶ −17.3 × 10 ⁻⁶ ) = 0.28
7 mm. That is, a displacement of 0.287 mm occurs, which is the size of four discharge ports. If such a displacement occurs, it cannot be very practical as an ink jet recording head.

Therefore, as shown in FIG. 5D, a support member 415 for regulating the coefficient of thermal expansion of the grooved top plate 400 is provided on the grooved top plate 400 in the longitudinal direction of the grooved top plate 400. That is, it is provided in the resin of the grooved top plate 400 along the ink flow path arrangement direction. Here, the support member 415 is
It is the same stainless steel pipe as the support 300, and both ends protrude from the main body of the grooved top plate 400 to serve as ink supply ports. In addition, a hole 414 communicating with the liquid chamber 411 is formed in the support member 415 in advance, so that the support member 415, that is, the inside of the pipe and the liquid chamber communicate with each other. The surface of the support member 415 is subjected to surface processing such as blasting or knurling, whereby the degree of adhesion between the support member 415 and the resin of the grooved top plate 400 is improved. From the relation of the mechanical strength (elastic coefficient etc.) between the support member 415 and the resin constituting the grooved top plate 400, the grooved top plate 4
The coefficient of linear thermal expansion of the whole of 00 matches the coefficient of linear thermal expansion of stainless steel. By doing so, the grooved top plate 4
00 and the support 300 have the same coefficient of thermal expansion, so that there is no shift due to temperature rise.

Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment, the common liquid chamber 411 is divided by the separation wall 416 perpendicular to the nozzle arrangement direction. However, as shown in FIG. 8, the separation wall 417 extends in the nozzle arrangement direction.
A common liquid chamber 411 is formed by a liquid chamber 419 for ink circulation.
And a liquid chamber 420 for ejecting ink, which are communicated with each other by a slit 418 so that ink can be supplied. With this configuration, for example, even when bubbles are generated in the liquid chamber while the ink is being ejected, the ink can be circulated without stopping printing to perform the recovery operation. This is because the swing of the ink during the circulation of the ink is not directly transmitted to the ink flow path 412.

The typical construction and principle of an ink jet recording head and recording apparatus according to the present invention are described in, for example, US Pat. Nos. 4,723,129 and 4,7,129.
It is preferred to use the basic principles disclosed in US Pat. No. 40,796. This method can be applied to both the so-called on-demand type and the continuous type. In particular, in the case of the on-demand type, the electric heat disposed corresponding to the sheet or liquid path holding the liquid (ink) is used. By applying at least one drive signal to the converter that provides a rapid temperature rise exceeding nucleate boiling in response to the recorded information, heat energy is generated in the electrothermal converter and consequently this drive signal This is effective because air bubbles in the liquid (ink) can be formed correspondingly. By discharging the liquid (ink) through the discharge opening by the growth and contraction of the bubble, at least one droplet is formed. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of a liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable. As the pulse-shaped drive signal, those described in U.S. Pat. Nos. 4,463,359 and 4,345,262 are suitable. It should be noted that U.S. Pat. No. 4,313,124 of the invention relating to the rate of temperature rise of the heat acting surface.
If the conditions described in the specification are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of a discharge port, a liquid path, and an electrothermal converter (a linear liquid flow path or a right-angle liquid flow path) as disclosed in the above-mentioned respective specifications, The present invention also includes a configuration using U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459,600 which disclose a configuration in which a heat acting portion is arranged in a bending region. It is. In addition, JP-A-59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy is discharged. The present invention is also effective as a configuration based on JP-A-59-138461 which discloses a configuration corresponding to a unit.

Further, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, a combination of a plurality of recording heads as disclosed in the above-mentioned specification is used. Either a configuration that satisfies the length or a configuration as a single recording head that is integrally formed may be used, but the present invention can more effectively exert the above-described effects. In addition, a replaceable chip-type recording head that can be electrically connected to the device main body and supplied with ink from the device main body when attached to the device main body, or the ink tank is integrated with the recording head itself The present invention is also effective when a cartridge-type recording head provided in a fixed manner is used.

It is preferable to add recovery means for the recording head, preliminary auxiliary means, and the like provided as components of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. If you list these specifically,
A capping unit, a cleaning unit, a pressurizing or suctioning unit, a preheating unit using an electrothermal transducer or a heating element other than these, or a combination thereof, and a preliminary ejection for performing a different ejection from recording to the recording head. Performing the mode is also effective for performing stable recording.
Further, the recording mode of the recording apparatus is not limited to a recording mode of only a mainstream color such as black, and may be a recording head integrally formed or a combination of a plurality of recording heads. The present invention is extremely effective for an apparatus having at least one of the full colors.

When the alloy material according to the present invention is used, resistance to cavitation impact, resistance to erosion due to cavitation, electrochemical stability, chemical stability, oxidation resistance, melting resistance, heat resistance, thermal shock resistance ,
An ink jet head and an ink jet head device including an electrothermal transducer having a heating resistor excellent in mechanical durability and the like can be obtained. In particular, it is possible to obtain an ink jet head and an ink jet device in which the heat generating portion of the heat generating resistor is in direct contact with the ink in the ink path. In the ink jet head and the ink jet device having this configuration, the heat energy generated from the heat generating portion of the heating resistor can be directly applied to the ink, so that the heat transfer efficiency to the ink is good. Therefore, the power consumption by the heating resistor can be kept low, and the temperature rise of the ink-jet head (temperature change of the ink-jet head) can be remarkably reduced, so that the image density change due to the temperature change of the ink-jet head is avoided. be able to. Further, it is possible to obtain better responsiveness to the ejection signal applied to the heating resistor.

Further, in the heating resistor according to the present invention, a desired specific resistance can be obtained with good controllability and with a very small variation in resistance value in one ink jet head. Therefore, according to the present invention, it is possible to obtain an ink-jet head and an ink-jet apparatus which can discharge ink much more stably than in the past and have excellent durability. An ink jet head and an ink jet apparatus having the above-described favorable characteristics are very suitable for high-speed recording and high image quality accompanying multiple ejection ports.

In the above-described embodiments of the present invention, the ink is described as a liquid. However, the ink is a solidified ink at room temperature or lower, and is softened or liquid at room temperature. Generally, the temperature is controlled within a range of not less than 70 ° C. and not more than 70 ° C., and the temperature is controlled so that the viscosity of the ink is in a stable ejection range. good. In addition, the temperature rise due to heat energy is positively prevented by using the energy of the state change from the solid state to the liquid state of the ink, or the ink that is solidified in a standing state is set to prevent evaporation of the ink on a daily basis. In any case, thermal energy such as one in which ink liquefies and is ejected as an ink liquid by application of thermal energy according to a recording signal, and one in which solidification is already started at the time of reaching a recording medium. The use of an ink that liquefies for the first time is also applicable to the present invention. In such a case, as described in JP-A-54-56847 or JP-A-60-71260, the ink is held as a liquid or solid substance in the concave portion or through hole of the porous sheet, It is good also as a form which opposes an electrothermal transducer. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

[0028]

According to the present invention, the common liquid chamber is divided into a plurality of small chambers by the separation wall formed by the above-mentioned wall which is not joined to the ink flow path. Separation into two or more small chambers corresponding to the holes of the SUS pipe allows a plurality of discharge ports, especially a large number (for example, 1000 or more) of discharge ports to be provided, and even when the common liquid chamber becomes large, the ink discharge at the time of ink discharge. In this manner, it is possible to suppress the fluctuation of the ink in the common liquid chamber, thereby reducing the distortion and unevenness due to the crosstalk, and realizing an ink jet recording head suitable for a long print with high ejection performance. Further, according to the present invention, a liquid chamber for ink circulation and a liquid chamber for ink discharge are separated by a separation wall extending in an ink discharge arrangement direction, and both liquid chambers are formed by a plurality of slits formed in the separation wall. By adopting the communication structure, it is possible to prevent the swing of the ink during ink circulation from being directly transmitted to the ink flow path, and even if bubbles are generated in the liquid chamber during the ejection of the ink, the printing is performed. It is possible to perform the recovery operation by circulating the ink without stopping the operation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an inkjet recording head according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of main components in the first embodiment.

FIG. 3 is a sectional view of a top plate member.

FIG. 4 is a detailed view showing a state where a heater board is arranged.

5A is a top view of the grooved top plate, FIG. 5B is a front view of the grooved top plate, FIG. 5C is a bottom view of the grooved top plate, and FIG.
It is XX sectional drawing of (b).

FIG. 6 is a schematic diagram showing a positional relationship between a support, a heater board, and a grooved top plate.

FIG. 7 is a diagram showing a structure of a grooved top plate described in the first embodiment.

FIG. 8 is a diagram illustrating a structure of a grooved top plate described in a second embodiment.

FIG. 9 is a diagram illustrating printing on paper by a long line head.

[Description of Signs] 100: heater board (substrate) 101: discharge energy generating element 200: wiring board 201: pad 300: base plate (support) 400: top plate with groove 403: orifice plate 411: common liquid chamber 412: ink Flow path 413: orifice 414: ink supply port 415: support member (SUS pipe) 416: separation wall 417: separation wall 419: liquid chamber for ink circulation 420: liquid chamber for ink discharge

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiichiro Karita 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kiyomi Aono 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside (72) Inventor Takeshi Okazaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Yoshikazu Omata 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (3)

[Claims] 1. A substrate provided with ejection energy generating elements for giving ejection energy to ink corresponding to a plurality of ink flow paths, a groove corresponding to the ink flow path, and one end of the groove. An orifice plate provided with an ejection port from which ink is ejected, and an integral top plate member,
An ink jet recording head, in which the ink flow path is formed by joining the substrate and the top plate member to perform printing by discharging ink from the ink flow path corresponding to the discharge energy generating element, Inside the plate member, a top plate support member made of a stainless steel pipe having a hole communicating with the common liquid chamber is provided along the ink flow path arrangement direction, and the ink flow path is provided in the common liquid chamber. An ink jet recording head, wherein a separation wall is formed by a wall that is not joined to a path, and the separation wall is separated into a plurality of small chambers corresponding to holes communicating with a common liquid chamber of the stainless steel pipe. 2. The method according to claim 1, wherein the common liquid chamber is separated into a liquid chamber for ink circulation and a liquid chamber for ink discharge by a separation wall extending in an ink discharge arrangement direction, and a plurality of slits formed in the separation wall. 2. The ink jet recording head according to claim 1, wherein the two liquid chambers communicate with each other. 3. A large-sized orifice plate having a large number of discharge ports provided in said orifice plate.
Or the inkjet recording head according to claim 2.