JPH05193156A - Liquid jet record head and liquid jet recording device using the same - Google Patents

Abstract

PURPOSE:To perform recovery processing stably with a high efficiency without fill-in of ink occurring due to adhesion of it in a recovery passage by providing a region where the recovery passage has a fixed sectional area in the longitudinal direction and a liquid holding section whose sectional area diminishes toward an outlet section. CONSTITUTION:A liquid jetting section 1 is equipped with an outlet 2 and a liquid passage 3 communicating with the outlet 2. The liquid passage 3 comprises an energy working section where energy generated by an energy- generating element 4 works on liquid in the liquid passage 3. As for the liquid passage 3, a plurality of passages is provided normally. The liquid passage 3 becomes wider in its width at a part where the energy-generating element 4 is provided. The liquid passage 3 may have a cylindrical shape without irregular width. A liquid chamber 5 communicates with each liquid passage 3, storing a liquid 6 for supplying to the liquid passage 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid jet recording apparatus for recording by ejecting flying droplets from a discharge port.

[0002]

2. Description of the Related Art The non-impact recording method has recently attracted a great deal of attention in that noise generation during recording is extremely small to a negligible level. Among them, the inkjet recording method (liquid jet recording method), which can perform high-speed recording and can perform full-color recording without requiring special processing such as fixing on plain paper, is an extremely powerful recording method. Various methods have been proposed so far, some have already been commercialized, and some are still being studied.

In such a liquid jet recording method, recording is performed by ejecting droplets of a recording liquid, which is so-called ink, and adhering the droplets onto a recording material. Depending on the method of forming the droplet and the method of controlling the flight direction of the formed droplet, it is roughly classified into several methods.

Among them, for example, USP3683212
No. 3,747,120, No. 3946398, etc., the liquid jet recording method ejects droplets from an ejection orifice according to a recording signal and causes the droplets to adhere to the surface of a recording material for recording. This is a so-called drop-on-demand recording method. In this recording method, since only the liquid droplets necessary for recording are ejected, a special means for collecting and processing the ejected liquid unnecessary for recording is provided. No need to install,
Recently, the device itself can be simplified and downsized, there is no need to control the flight direction of the liquid droplets ejected from the ejection orifice, and moreover, multicolor recording can be performed easily. , Especially attracting attention.

A liquid jet recording method which is completely different from the above-mentioned liquid jet recording method in the principle of formation of flying droplets is disclosed in West German Laid-Open Patent Publication No. 2843064 (drop formation using thermal energy that causes a change in the state of liquid). Method), the liquid jet recording method is not only very effectively applied to the drop-on-demand recording method described above, but also a high-density multi-orifice recording head can be easily realized. Therefore, it has a feature that a high-resolution and high-quality recorded image can be obtained at a high speed.

The liquid jet recording apparatus used in these drop-on-demand recording methods usually includes an ejection port (orifice) for ejecting droplets and an energy generating element communicating with each orifice to form flying droplets. A liquid flow path having
A structure in which a recording head that is in communication with each liquid flow path and that includes a liquid chamber that stores liquid to be supplied to these flow paths is fixed on a carriage that can relatively scan on a recording material Target. Further, since the recording head is generally formed as a small one, recording can be performed for an extremely short time only with the amount of recording liquid that can be stored in the liquid chamber. Therefore, normally, the liquid chamber is connected by a movable liquid supply tube which is a transporting means for transporting ink from an ink tank fixed to a position different from the carriage.

However, in the drop-on-demand recording method in which recording is performed by using the liquid jet recording apparatus as described above, when bubbles enter the liquid flow path, the jetting of droplets becomes extremely unstable and satellite There is an inconvenience such as unnecessary jetting of liquid droplets, which is referred to as “secondary jetting”, or even the fact that the jetting of droplets becomes impossible. Therefore, the liquid that is fed from the ink tank through the liquid supply tube to the liquid flow path of the recording head is the air that is dissolved in the liquid and then precipitates, or the air that has entered from the liquid supply tube wall or the like during feeding. It must be separated and fed to the liquid flow path. For this reason, the liquid chamber is designed so as to separate the liquid and air so that these air do not enter the liquid flow path, and the liquid chamber needs an air vent pipe line for venting the separated air. Is.

However, conventionally, in the air venting operation using this air vent pipe, the outlet of the air vent pipe is once opened to the outside, unnecessary air is discharged from the liquid chamber together with the liquid, and then the air vent pipe is closed again. Since the operation is required, the discharged liquid may contaminate the operator or the device. For the purpose of remedying this drawback, a method of providing an air vent pipe having a capillary tube in the liquid chamber and opening / closing the air vent pipe at the time of air venting operation by the capillary action of the liquid in the capillary tube is disclosed in, for example, JP-A-52- 49032
Is proposed in the issue. However, also in this method, as a means for providing an air vent pipe having a capillary tube in the liquid chamber, a capillary tube made of glass or the like prepared in advance is attached to the liquid chamber by a method such as bonding, or the capillary tube is precision machined to the liquid chamber. When forming holes, or when molding a liquid chamber with resin, a method such as providing a part for a capillary hole in the molding die was used, but in either method, the shape and dimensions of the capillary tube are accurate and mass production is possible. However, it is difficult to provide it in the liquid chamber, and there are drawbacks such that it is difficult to obtain a desired capillary action due to an increase in manufacturing cost and poor precision of the shape and size of the capillary.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid jet recording apparatus which eliminates the drawback of the above-mentioned conventional example, that is, the difficulty in manufacturing for providing an air vent pipe line of a capillary tube in a liquid chamber. To do.

Another object of the present invention is to improve the shape and size of the air vent pipe so that the opening and closing action of the liquid in the air vent pipe can be performed more reliably, and further the air vent pipe can be opened during the air vent operation. To provide a liquid ejecting recording apparatus which facilitates accommodation of a liquid discharged together with unnecessary air after that, and which can surely and simply remove and remove air bubbles that have entered the recording orifice due to disturbance or the like. It is in.

Still another object of the present invention is to further improve the shape and size of the air vent pipe so that the air vent operation and the removal operation of bubbles that have entered the recording orifice due to disturbance or the like can be performed by the same operation. Accordingly, it is an object of the present invention to provide a liquid jet recording apparatus capable of simplifying the auxiliary equipment for the air venting operation or the jet recovery operation and simplifying the operation.

The present invention uses a recording head provided with a recovery passage for discharging liquid during recovery processing such as air venting, in addition to a normal recording liquid passage for discharging liquid by driving an energy generating element. When the recovery process is applied, the main technical problem is the problem that the recovery effect is lowered due to the variation in the liquid discharge, and the main solution is the constitution found from the relationship of the fluid resistance.

That is, the recording head (first invention) of the present invention is
A plurality of sets of a liquid passage provided for ejecting the liquid to form flying droplets, an energy generating element for applying energy for ejecting the liquid to the liquid passage, and a plurality of ejection ports communicating with the liquid passage, and the plurality of sets. And a liquid chamber communicating with the liquid passage of
In a liquid jet recording head which is provided with a recovery path communicating with the liquid chamber and having a recovery outlet, the recovery path has substantially the same shape and size as the liquid path, and is directed toward the outlet. The liquid is guided by a capillary force and is filled with the liquid. The recording apparatus of the present invention (the second invention) sucks a liquid jet recording head and a recovery process for the recording head. Alternatively, in the liquid ejecting recording apparatus, which comprises a recovering means for applying pressure, the droplet is attached to the surface of the recording material to perform recording, and the recording head is a liquid provided for forming the droplet. And a plurality of sets of discharge ports communicating with the liquid passage, and a liquid chamber communicating with the plurality of liquid passages. It has a communication recovery outlet and A recovery path, which has almost the same shape and dimensions and which guides the liquid toward the outlet portion by capillary force and is filled with the liquid, is provided. The liquid resistance is almost the same, and the liquid in the liquid chamber is discharged from both the liquid passage and the recovery passage by the operation of the recovery means.

According to the first aspect of the present invention, unlike the ejection port for ejecting the recording liquid droplet, the recovery passage itself used for the recovery process has substantially the same fluid resistance with respect to the common liquid chamber. Since the shapes and the dimensions are substantially the same so that the same, the difference between the discharge liquid passage and the recovery passage can be eliminated, and a uniform acting force and pressure distribution can be obtained as a whole. Therefore, the recovery processing effect can be made highly efficient and wasteless, and the recovery processing time of the recording head, the loss of the recovery liquid, etc. can be greatly reduced as compared with the conventional case. That is, it is possible to provide a recording head that can perform recovery processing easily and in a short time without waste, and that enables good recording.

Similarly, according to the second aspect of the present invention, the recording recovery time can be shortened, and the recording time as a whole can be shortened.
A liquid jet recording apparatus that can perform high-speed recording without waste can be provided.

In particular, in both the first and second aspects of the invention, by forming the ejection port and the ejection portion on the same surface of the recording head, the size of the apparatus is reduced and the recovery process is made more efficient (especially, the distribution of the suction force is made uniform). Yes, it can have the further advantage that a miniaturization of the recovery device can be achieved.

[0017]

An embodiment of a liquid jet recording apparatus of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic sectional view showing the outline of one embodiment of the liquid jet recording apparatus of the present invention.

In the figure, reference numeral 1 is a liquid ejecting section, which is provided with a discharge port 2 and a liquid flow path 3 communicating with the discharge port 2. In the liquid flow path 3, the energy generated by the energy generating element 4 (which is connected to the drive circuit by a wiring (not shown)) that generates energy used for ejecting the liquid is the liquid in the liquid flow path 3. An energy acting portion that acts on is provided. It should be noted that although only one liquid flow path 3 is shown in the drawing for simplification,
Usually, a plurality is installed. Further, the liquid flow path 3 is illustrated such that the width thereof is wide in the portion where the energy generating element 4 is installed, but the liquid flow path 3 is the same (the width of the flow path does not change). But of course it is okay. A liquid chamber 5 communicates with each liquid flow path 3 and stores a liquid 6 to be supplied to the liquid flow path 3, and residual air 7 is accumulated above (vertically above) the liquid 6. An air vent pipe 8 for discharging the residual air 7 is provided in the member forming the liquid ejecting unit 1, and has an inlet 9 thereof in the liquid chamber 5.
The outlet 10 is provided in the liquid ejecting section 1 and has a capillary section 11 in the liquid ejecting section 1. Therefore, it is desirable that the outlet 10 of the air vent pipe is installed at a relatively upper portion in the liquid chamber 5, at least above each liquid flow path 3. It should be noted that the residual air 7 can be left in the liquid chamber 5 as long as it does not cause the above-mentioned various inconveniences when the droplets are ejected from the ejection port 2. The liquid (ink) stored in the liquid storage tank 12 is supplied to the liquid chamber 5 through a liquid supply pipe 13 which usually has a flexible portion.

FIG. 2 is an exploded perspective view for explaining the structure of the liquid ejecting section 1 and the liquid chamber 5 of the liquid ejecting recording apparatus shown in FIG. 1 and the manufacturing method thereof in more detail.

Reference numeral 14 is a liquid ejecting portion substrate in which grooves for the discharge port 2, the liquid flow path 3 and the air vent pipe path 8 are formed by etching a photo serum (trade name, manufactured by Corning Co., Ltd.). The top plate of the liquid ejecting unit is made of stainless steel and has a thickness of 0.2 mm, and the mounting portion of the energy generating element 4 has holes formed by etching. The liquid ejecting section substrate 14, the liquid ejecting section top plate 15, and the energy generating element 4
Are integrally formed by, for example, bonding to form the liquid ejecting unit 1. On the other hand, 16 is a main body of the liquid chamber, and 17 is a lid of the liquid chamber, which is manufactured by, for example, injection molding of a thermoplastic resin and is integrated by means such as adhesion. After that, the liquid ejecting unit 1 and the liquid chamber 5 are integrated to complete the recording head unit of the liquid ejecting recording apparatus.

Although the grooves for the discharge port 2, the liquid flow path 3 and the air vent pipe 8 are formed directly on the liquid ejecting section substrate 14 here, the concave grooves are not necessarily formed directly on the substrate. The method is not limited to, for example, a method of selectively removing the photosensitive resin in a pattern after applying the photosensitive resin on the substrate, a metal in which a portion corresponding to the groove is removed in a slit shape by etching, or the like. It may be formed by a method of laminating the plate on the substrate.

In the liquid jet recording apparatus of the present invention as described above, the liquid stored in the liquid storage tank 12 is pressurized by a pressure device (not shown), or the outlet 10 of the air vent pipe is sucked (not shown). By performing the operation of sucking with the device, the residual air 7 in the liquid chamber 5 is removed.
By being discharged together with the liquid 6 therein, and thereafter stopping the pressurization or suction, the air vent pipe line 8 is automatically closed by the capillary action of the liquid inside the capillary portion 11.

In the liquid jet recording apparatus of the present invention, since the air vent pipe 8 is provided in the member forming the liquid jet unit 1, a sub-process is performed in the process of manufacturing the liquid jet unit 1. In addition, since it can be manufactured with high accuracy equivalent to the liquid flow path, it can be manufactured extremely economically and in mass production, and since its shape and dimensions can be obtained with high accuracy,
It is possible to remarkably improve the reliability of holding the liquid by the capillary action.

FIG. 3 shows another embodiment of the present invention. In this example, the capillary portion 1 is provided in the air vent pipe line 8.
No. 1 is provided, the outlet 10 of the air vent pipe is formed into an orifice shape, and the orifice portion 18 holds the liquid.

Since the residual air 7 in the liquid chamber 5 and the liquid 6 in the liquid chamber 5 pass together through the air vent pipe 8 during the air vent operation, there is no air in the air vent pipe 8 during the air vent operation. The liquid and the air may alternately and intermittently remain, and the intermittent residual of the liquid and the air causes the air vent line 8
When it occurs in the capillary section 11 inside, the holding force of the liquid in the capillary section 11 is significantly increased. Therefore, the pressure applied to the liquid storage tank 12 or the suction force applied to the outlet 10 of the air vent pipe during the air venting operation is , It is necessary to set it high enough in advance. However, it is preferable to set the pressurizing force or the suction force to be high as described above because the wasteful liquid consumption accompanying the air venting operation is increased and the container for storing the discharged liquid becomes large. Absent. Further, when the orifice-like portion in the air vent pipe 8 is provided at the inlet portion of the air vent pipe or the intermediate portion between the inlet and the outlet, both sides of the orifice portion may be filled with liquid, In this case, normally, the liquid in the air vent pipe retreats in the direction of the liquid chamber 5, and when the interface of the liquid with the air reaches the orifice-like portion, the retreat of the liquid is blocked by the capillary action, but the device is tilted. When placed, the liquid in the liquid chamber may advance in the air vent pipe, and the liquid may leak from the outlet of the air vent pipe. However, such a defect can be eliminated by providing the orifice-like portion in the air vent pipe 8 at the outlet of the air vent pipe as in this embodiment.
Is a preferred embodiment of the present invention.

FIG. 4 also shows another embodiment of the present invention. In this example, the outlet 10 of the air vent pipe is shown.
Is provided on the same surface as the surface provided on the ejection port 2 of the liquid ejecting unit 1.

Usually, in a liquid jet recording apparatus using the drop-on-demand recording method, when bubbles enter the liquid flow path due to disturbance or the like, the jetting of the droplets becomes unstable, or, more specifically, the droplets are jetted. It may be impossible. In such a case, it is necessary to pressurize the liquid in the liquid storage tank 12 or suck the discharge port 2 from the outside to discharge the bubbles in the liquid flow path. As this so-called injection recovery operation, for example, a measure for liquid leakage from the air vent pipe that may occur when the liquid in the liquid storage tank 12 is pressurized, or an air vent pipe that may occur when the discharge port 2 is sucked from the outside In order to prevent backflow of air from the air outlet, or, conversely, to perform exactly the same countermeasure required for the liquid ejecting unit during the air bleeding operation, the outlet 10 of the air bleeding line is replaced with the surface on which the discharge port 2 of the liquid ejecting unit 1 is provided. By providing them on the same surface, it is possible to carry out the operation very easily. That is, for example, leakage of liquid from the discharge port and the air bleeding line that occurs when performing the injection recovery operation or the air bleeding operation by pressurizing the liquid in the liquid storage tank 12 is accommodated by the dual purpose liquid accommodating means. It is possible.

Further, even when the injection recovery operation or the air bleeding operation is performed by sucking the discharge port and the outlet of the air bleeding pipe from the outside, the discharge port and the outlet of the air bleeding pipe can be sucked at the same time. It is possible to prevent backflow of air from any of them, and additionally, it is possible to serve as a suction means.

Furthermore, for example, by making the shape and size of the air vent pipe substantially the same as the shape and size of the liquid flow path,
Since the holding force of the liquid and the tube resistance due to the viscosity of the liquid in both are almost the same, for example, when the liquid in the liquid storage tank 12 is pressurized during the air bleeding operation or the injection recovery operation, the pressing force or discharge When suctioning the outlet or the outlet of the air vent pipe from the outside, the suction force can be set to a common condition in both the injection recovery operation and the air vent operation. It is not necessary to select the capability of the instrument individually for both operations.

As described above, in the embodiment shown in FIG.
It is possible to simplify the auxiliary equipment and the operation for the air venting operation or the jet recovery operation, and it is extremely effective for downsizing the liquid jet recording apparatus and reducing the manufacturing cost.

The first and second aspects of the present invention having the above structure
According to the configuration in the embodiment common to the invention, it is possible to manufacture the air vent pipe extremely economically and in mass production, and since its shape and dimensions can be obtained with high accuracy,
It has become possible to significantly improve the reliability of liquid retention. In addition, by providing the outlet of the air vent pipe on the same surface as the surface of the liquid ejecting section on which the discharge port is provided, it is possible to prevent discharge liquid storage means or air backflow prevention means for the injection recovery operation or the air vent operation. Standardization of additional means,
It can be simplified. Furthermore, the shape of the air vent line,
By making the size substantially the same as the shape and size of the liquid flow path, it is possible to make the additional means such as the pressurizing means or the suction means for the injection recovery operation or the air bleeding operation common and simple. Can be downsized and the manufacturing cost can be reduced.

The present invention has a structure common to both the first invention liquid jet recording head and the second invention liquid jet recording apparatus.
Recovery to the non-recording recovery outlet that communicates with this liquid chamber to the size and shape up to the discharge port that discharges the recording droplets of the liquid path that communicates with the liquid chamber and that is affected by multiple discharge energies Since the passages have substantially the same size and shape, the distribution of the action force of the recovery process can be made to have the same fluid resistance, and a reliable recovery process effect can be obtained. Therefore, according to the present invention, good liquid ejection can be achieved for a long period of time, and various industrial benefits can be brought about.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an outline of one embodiment of a liquid jet recording apparatus of the present invention.

FIG. 2 is an exploded perspective view of a liquid jet recording head portion.

FIG. 3 is a schematic cross-sectional view of a liquid jet recording head portion showing another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a liquid jet recording head portion showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid injection part 2 Discharge port 3 Liquid flow path 4 Energy generating element 5 Liquid chamber 6 Liquid 7 Residual air 8 Air vent pipe line 9 Air vent pipe line inlet 10 Air vent pipe line outlet 11 Capillary part 12 Liquid storage tank 13 Liquid supply pipe 14 Liquid Injection part substrate 15 Liquid injection part top plate 16 Liquid chamber main liquid 17 Liquid chamber lid 18 Orifice part

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[Procedure amendment]

[Submission date] June 17, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

However, conventionally, in the air venting operation using this air vent pipe, the outlet of the air vent pipe is once opened to the outside, unnecessary air is discharged from the liquid chamber together with the liquid, and then the air vent pipe is closed again. Since the operation is required, the discharged liquid may contaminate the operator or the device. For the purpose of remedying this drawback, a method of providing an air vent pipe having a capillary tube in the liquid chamber and opening / closing the air vent pipe at the time of air venting operation by the capillary action of the liquid in the capillary tube is disclosed in, for example, JP-A-52- 49032
Is proposed in the issue. However, also in this method, as a means for providing an air vent pipe having a capillary tube in the liquid chamber, a capillary tube made of glass or the like prepared in advance is attached to the liquid chamber by a method such as bonding, or the capillary tube is precision machined to the liquid chamber. When forming holes, or when molding a liquid chamber with resin, a method such as providing a part for a capillary hole in the molding die was used, but in either method, the shape and dimensions of the capillary tube are accurate and mass production is possible. However, it is difficult to provide it in the liquid chamber, and there are drawbacks such that it is difficult to obtain a desired capillary action due to an increase in manufacturing cost and poor precision of the shape and size of the capillary.
Further, in the above-mentioned JP-A-52-49032, air is used.
Air has entered a part of the bleed pipe, and
Insufficient volume of ink in the conduit
Ink may get stuck in the road, causing clogging.
was there.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

DISCLOSURE OF THE INVENTION The object of the present invention is to remove air from a capillary tube in a liquid chamber, which is a drawback of the above conventional example.
It is an object of the present invention to provide a liquid jet recording head and a liquid jet recording apparatus using the liquid jet recording head, which eliminates the manufacturing difficulty for providing a (recovery path) .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Another object of the present invention is to provide the shape of the recovery path,
The dimensions are improved so that the opening and closing action of the liquid in the air vent pipe can be performed more reliably, and the liquid discharged along with the unnecessary air through the air vent pipe during the air venting operation can be easily accommodated and disturbances can be prevented. Liquid jet recording head and liquid using the same, which can surely and simply remove air and air from the recording orifice
It is to provide a body ejection recording apparatus.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Still another object of the present invention is the shape of the recovery path,
By further improving the dimensions, the air venting operation and the removal operation of bubbles that have entered the recording orifice due to disturbance etc. can be performed in the same operation, and the simplification and operation of the auxiliary equipment for air venting operation or injection recovery operation Jet recording head capable of simplifying printing and liquid jet using the same
It is to provide an electronic recording device. Also, the shape of the air recovery path
The shape and dimensions are further improved, causing clogging in the recovery path.
Liquid jet recording head and its use
It is to provide a liquid jet recording apparatus.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

That is, the recording head of the present invention (first invention)
The discharge port for discharging the liquid and the discharge port communicating with the discharge port.
Energy generating element for discharging the liquid from the outlet
And a liquid chamber communicating with the liquid passage.
A recovery path that communicates with the liquid chamber and has a recovery outlet
In the liquid jet recording head including:
A section that is filled with the liquid and that is substantially constant in its lengthwise direction
Product area and the area of the constant cross-sectional area of the recovery path.
Holding liquid whose cross-sectional area decreases from the area toward the outlet side
It is characterized in that a part, recording apparatus of the present invention (second invention), a discharge port for discharging liquid, the
In order to discharge the liquid from the discharge port by communicating with the discharge port
The fluid passage in which the energy generating element of
And a liquid chamber for performing recovery for communicating with the liquid chamber.
A recovery path having an outlet, wherein the recovery path is the liquid
A region of substantially constant cross-section along its length
And from the area of the constant cross-section of the recovery path
It has a liquid holding part whose cross-sectional area decreases toward the outlet side.
Liquid ejecting recording head, and
And a recovery means for performing recovery processing .

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

According to the first aspect of the present invention, the recovery path used for the recovery process is provided separately from the liquid path for ejecting the recording liquid droplets.
The recovery path is a region with a constant cross-sectional area in the length direction.
And the liquid whose cross-sectional area decreases from this area toward the outlet side.
Since it has a body holding part, the volume of liquid in the recovery path is large.
It is possible to adjust the volume and the liquid holding part to the outlet part.
Since the liquid will be retained in the
There is no risk of clogging and clogging. Therefore, the recovery processing effect can be performed efficiently with high efficiency and without waste , and the recovery processing time of the recording head, the recovery liquid loss, etc. can be greatly reduced as compared with the conventional case. That is, it is possible to provide a recording head that can perform recovery processing easily and in a short time without waste, and that enables good recording.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

FIG. 3 shows another embodiment of the present invention. In this example, the capillary portion 1 is provided in the air vent pipe line 8.
Turn the exit 10 of the recovery road toward the exit without turning 1
An orifice shape is formed so that the cross-sectional area of the return path is reduced , and the liquid is held by the orifice portion (liquid holding portion) 18.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Since the residual air 7 in the liquid chamber 5 and the liquid 6 in the liquid chamber 5 pass through the recovery passage 8 together during the air bleeding operation, the liquid in the air bleeding pipe 8 is emptied during the air bleeding operation. And air may alternately and intermittently remain, and when this intermittent residue of liquid and air occurs in the capillary portion 11 in the air vent pipe line 8 in FIG. 1 , the liquid in the capillary portion 11 is Since the holding force is significantly increased, the pressure applied to the liquid storage tank 12 during the air venting operation or the suction force applied to the outlet 10 of the air vent pipe must be set sufficiently high in advance. However, it is to be set in this way the pressure or suction force increases, to increase the consumption of accompanying wasteful liquid air vent operation, and less to be large container for housing the ejected liquid Not preferable. Also, the orifice-like portion in the recovery path 8 is
When it is provided at the inlet part of the air vent pipe or at the intermediate portion between the inlet and the outlet, liquid may be filled on both sides of the orifice-like part. In this case, the liquid in the air vent pipe is normally filled with liquid. When the device is placed in a tilted state, the liquid in the liquid chamber is removed by the capillary action. Liquid sometimes leaked from the outlet of the air venting line when moving forward. However, such a drawback is that the air vent line 8 is the same as in this embodiment.
The orifice-like portion (liquid holding portion) therein can be removed by providing it on the outlet side of the air vent pipe. Further, as described above, the liquid holding portion is provided on the outlet side.
By doing so, the cross-sectional area in the middle of the recovery path is constant as shown in the figure,
This is the case when an area is provided to increase the volume of liquid in the channel.
Even if the liquid is retained near the outlet, the recovery path
Not only can it prevent clogging, but it can also prevent liquid leakage.
It

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Delete

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

The first and second aspects of the present invention having the above structure
According to the configuration of the embodiment common to the invention, it is possible to manufacture the recovery path extremely economically and in mass production, and since the shape and size of the recovery path can be obtained with high accuracy, the reliability of liquid retention can be improved. It has become possible to improve significantly .

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

The present invention has a structure common to both the first invention liquid jet recording head and the second invention liquid jet recording apparatus.
Recovery to the non-recording recovery outlet that communicates with this liquid chamber to the size and shape up to the discharge port that discharges the recording droplets of the liquid path that communicates with the liquid chamber and that is affected by multiple discharge energies Since the sizes and shapes of the paths are almost the same, the distribution of the action force of the recovery process can be made to have the same fluid resistance , and in the present invention, the length of the recovery path is long.
A region having a substantially constant cross-sectional area in the direction
Has a liquid holding part whose cross-sectional area decreases from the
Therefore, the volume of the liquid in the recovery path is increased and the recovery
Holds liquid up to the outlet while keeping the liquid resistance small
The ink in the recovery path will stick to the
There is no need to worry about clogging. Accordingly because it is possible to obtain a reliable recovery process effect, a good liquid ejecting long term can be achieved, it can result in a number of benefits industry.

Claims (2)

[Claims] 1. An ejection port for ejecting a liquid, a liquid channel communicating with the ejection port and provided with an energy generating element for ejecting the liquid from the ejection port, and a liquid chamber communicating with the liquid channel. And a liquid jet recording head including a recovery path that is in communication with the liquid chamber and has a recovery outlet, the recovery path having a substantially linear portion filled with the liquid, A liquid jet recording head, comprising: a liquid holding portion whose cross-sectional area of the recovery path decreases from the straight portion of the recovery path toward the outlet portion side. 2. An ejection port for ejecting a liquid, a liquid passage communicating with the ejection port and having an energy generating element for ejecting the liquid from the ejection port, and a liquid chamber communicating with the liquid passage. And a recovery path communicating with the liquid chamber and having a recovery outlet portion, the recovery path having a substantially linear portion filled with the liquid, and the recovery path having the linear shape. A liquid ejecting recording head having a liquid holding portion in which the cross-sectional area of the recovery path decreases from the portion of the recording head toward the outlet portion side, and recovery means for performing recovery processing on the recording head. Jet recording device.