MXPA98004377A - Method for the discharge of liquid and head to download liquid - Google Patents

Method for the discharge of liquid and head to download liquid

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Publication number
MXPA98004377A
MXPA98004377A MXPA/A/1998/004377A MX9804377A MXPA98004377A MX PA98004377 A MXPA98004377 A MX PA98004377A MX 9804377 A MX9804377 A MX 9804377A MX PA98004377 A MXPA98004377 A MX PA98004377A
Authority
MX
Mexico
Prior art keywords
liquid
flow path
separation membrane
discharge head
head according
Prior art date
Application number
MXPA/A/1998/004377A
Other languages
Spanish (es)
Inventor
Kudo Kiyomitsu
Yoshihira Aya
Kashino Toshio
Taneya Yoichi
Shimazu Satoshi
Ishinaga Hiroyuki
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of MXPA98004377A publication Critical patent/MXPA98004377A/en

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Abstract

The present invention relates to a method for discharging a liquid from a head having a first flow path adapted to discharge the liquid from an upstream side to a downstream side, to a discharge port, a second flow path provided with a bubble generating region to generate a bubble in the liquid, a movable separating membrane which maintains the first and second flow paths substantially apart and which is movable through a displacement regime, and a movable member having a free end on the side of the discharge port and adapted to move according to the displacement regime of the movable separation member, the method comprising: moving the movable separation membrane with the bubble, the displacement being towards the first trajectory and being more on the downstream side that on the upstream side within the displacement regime of the removable separation membrane, discharge the liquid through the discharge port, by virtue of the displacement of the movable separation membrane, and repress the retraction a liquid meniscus through the discharge port in the first flow path, regulating a return separated from the movable separating membrane on the upstream side, at a level higher than a return velocity of the movable separation membrane on the downstream side, wherein the movable member regulates the return speeds during the return of the separating membrane movable towards the second flow path, consequently of the contraction of the bubble

Description

METHOD FOR THE DISCHARGE OF LIQUID AND HEAD TO DOWNLOAD LIQUID BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a method for discharging a liquid to be discharged and to a liquid discharge head that makes use of the formation of bubbles by means of thermal energy, for example, and more specifically, to a method for the discharge of a liquid and a liquid discharge head that depends on the use of a mobile separation membrane capable of effecting the displacement of itself as a result of the formation of bubbles. The term "record" as used herein means not only the action of forming images as characters and figures having meanings in a recording medium, but also the action of forming figures as they may be patterns that lack meaning in the record medium.
BACKGROUND OF RELATED ART The recording medium known as bubble jet, that is, the version of the ink jet recording method which effects the formation of an image on a recording medium using thermal energy, for example, on an ink doing by this means that the ink produces a change of state accompanied by a sudden volumetric change (production of bubbles), and allowing for this means the force of action due to this change of state to discharge the ink through a discharge port and allowing the discharged ink to adhere to the recording medium, hitherto has been known in the art. He • registration device that uses this registration method by bubble jet, as described in JP-61-59911 and JP-B-61-59914, is generally equipped with a discharge port to allow ink discharge, a flow path of the ink that communicates with the discharge port, and a heating or thermal element (element electrothermal converter) placed in the ink flow path and adapted as a power generating means to effect the discharge of the ink. The registration method described above possesses several advantageous features such as, allows easy production of recorded images and other high-resolution color images by using a small device because this method allows high-quality images to be recorded at high speed with little noise and the head incorporating this registration method allows ports of discharge for the discharge of this ink are placed in high density. The bubble jet recording method, therefore, has been used in recent years in various office apparatuses such as printers, copying devices and fascimile devices. Now it is on the way to 'finding utility in industrial applications, such as for a printing or printing machine. In the conventional bubble-jet recording method, since the heating element keeps in contact with the ink, it repeats the application of heat to the ink, it has the possibility of drying the ink and forming on the surface thereof a overheated or dry ink tank. When the liquid to be discharged tends to deteriorate by heat or is not easily allowed to form enough foam, sometimes, when the formation of bubbles by direct heating with the aforementioned term element can not carry out the perfect discharge - of the liquid. The applicant has proposed in JP-A-55- 81172 a method for effecting the discharge of a discharging liquid by foaming the bubbling liquid with thermal energy applied thereto by means of a flexible membrane adapted to separate the bubbling liquid and the liquid Downloader. This method is constructed so that the flexible membrane and the bubbling liquid are placed in part of a nozzle. On the contrary, a construction that uses a large membrane capable of separating the head in its integrity in a top and a bottom, is described in JP-A-59-23270. This large membrane is directed to allow a liquid flow path to be interposed between the two plate members and consequently prevents liquids from returning through the two plate members by mixing together. As ideas that take into consideration the foaming properties that are characteristic of bubble-forming liquids, an invention of JP-A-05-229122 which uses a liquid having a lower boiling point than a discharging liquid and an invention of JP -A-05-329148 which uses an electrically conductive liquid as a bubbling liquid have also been known in the art. The conventional method for the discharge of liquid by the use of a separation membrane has not reached a level of feasibility because it is constructed only for the separation of a bubbling liquid and a discharging liquid or is only proposed to improve the bubbling liquid itself . The present inventors have conducted a study on the discharge of liquid droplets by the use of a separator, with emphasis on the drops of liquid subjected to discharge, and consequently have reached a conclusion that the discharge of the liquid originated by the formation of bubbles with thermal energy has decreased efficiency through the intervention of aging membrane separation and has not yet been implemented. The present inventors, therefore, have initiated a study in the search for a method for the discharge of liquid and a device for this, which can make use of the effect of separation function by the separation membrane and at the same time improve the discharge of liquid to a higher level. The present invention has originated in the course of this study and is aimed at providing a transcendental discharge method and a device for this which can improve the efficiency of the discharge of liquid droplets and can stabilize and improve the volume of the droplets of liquid. liquid that will be discharged and the speed of discharge of liquid drops. Specifically, this invention resides in a head for liquid charging equipped with a first flow path used for a discharging liquid and adapted to communicate with a discharge port, a second flow path adapted to supply or transfer a bubbling liquid and comprises a bubble forming region, and a separating membrane, mobile, for separating the first and second flow paths, which is characterized by the ability to improve the efficiency of the discharge.
The present inventors, particularly interested in the liquid discharge head described in JP-A-5-229122, have shown that a small void space intended to serve as a bubble formation zone is placed on the upstream side of a port of Download in relation to the flow direction of a discharging liquid, that the bubble formation area has scarcely the same amplitude and length as the heating element, that when the bubble formation zone emits bubbles, a flexible membrane is displaced by the formation of the bubbles only in the vertical direction in relation to the discharge direction of the discharging liquid, and that the liquid discharge head, consequently, faces the problem of the production of not enough discharge velocity and of making movement of non efficient download. The inventors, in relation to the cause of this problem, have taken note of the fact that the same bubbling liquid always repeatedly uses the small, empty, closed space and have finally realized the production of an efficient discharge movement by virtue of the present invention. . The present invention has been produced in light of the problem faced by the prior art as already mentioned. The first objective of this invention is to provide, in a construction for substantially separate, preferably to perfectly separate, a discharging liquid and a bubbling liquid by means of a mobile separation membrane, a method for the discharge of liquid and a discharge head of the liquid which, while the force generated by the pressure of the bubbles is deforming the mobile separation membrane and transferring the pressure to the discharging liquid, not only prevents the pressure from escaping to the upstream side but also guiding the pressure in the direction of the discharge port and gives rise to a superior unloading force without sacrificing discharge efficiency. The second objective of this invention is to provide a method for the discharge of the liquid and a discharge head of the liquid which, due to the construction described above, allows a decrease in the amount of a deposit formed in the stack on a heating element and It allows the efficient discharge of the liquid without causing a thermal effect on the discharging liquid. The third objective of this invention is to provide a method for the discharge of liquid and a head for discharging the liquid having a wide freedom of selection without reference to the viscosity of the discharging liquid or the composition of the material thereof. Specifically, the main objective of this invention is to offer a liquid discharge head, which in addition to meeting the aforementioned objectives, allows the control of the liquid flow velocity in the flow path communicating with the port discharge as a result of the contraction of bubbles and speed distribution, stabilizes the direction of flow of satellites that originate beyond the droplets discharged from the main liquid and elevates the quality of a recorded image by decreasing the own amount of the. satellites It also lies in offering a liquid discharge head that decreases the amount of retraction of a meniscus from the liquid, improves the filling property and resolves the high frequency oscillation.
COMPENDIUM OF THE INVENTION The means adopted by the present invention to fulfill the aforementioned objectives will be described below. The method for discharging a liquid according to this invention comprises a step of effecting the discharge of the proposed liquid by causing a mobile separation membrane to be constantly maintained in a state substantially separate from a first flow path adapted to discharge a liquid and communicates with a discharge port and a second flow path provided with a bubble forming zone to form bubbles in the liquid to be displaced with the aforementioned bubbles more on the downstream side than on the upstream side inside. of the displacement range of the mobile separation membrane and discharge of the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, whose method is characterized by incorporating a step of repressing the retraction of a liquid meniscus through the discharge port in the first flow path by regulating the return velocity (VB) of the mobile separation membrane on the upstream side until a level greater than the return speed (VB) of the mobile separation membrane on the downstream side by the use of a movable member adapted to move in accordance with the displacement range of the mobile separation membrane during the return of the separation membrane moving towards the second flow path as a result of the contraction of the bubbles and provided on the side of the discharge port with a free end. This invention is further directed to a method for the discharge of a liquid, comprises a step of effecting the discharge of the proposed liquid by causing a mobile separation membrane that is constantly maintained in a substantially separate state a first flow path adapted to discharge a liquid and communicates with a discharge port and a flow path provided with a bubble forming zone to form bubbles in the liquid is displaced with the aforementioned bubbles more downstream than upstream side within the range of displacing the mobile separation membrane and discharging the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, which method is characterized to form a substantially symmetrical distribution of the meniscus retraction in relation to the central line of the discharge port regulating the reg of the moving separation membrane towards the second flow path as a result of the contraction of the bubbles by the use of a mobile member adapted to move in accordance with the displacement range of the mobile separation membrane during the return of the membrane of mobile separation towards the second flow path as a result of the contraction of the bubbles and provided on the side of the discharge port with a free end. This invention is further directed to a method for the discharge of a liquid, comprises a step of effecting the discharge of the proposed liquid by causing the mobile separation membrane to be constantly maintained in a substantially separate state a first flow path adapted to discharge a liquid and communicate with a discharge port and a second flow path provided with a bubble forming zone to generate bubbles in the liquid to be displaced with the aforementioned bubbles more on the downstream side than on the upstream side within the range of displacement of the mobile separation membrane and discharge of the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, which method is characterized by forming a substantially symmetrical distribution of the meniscus retraction in relation to the central line of the discharge port allowing the presence of at least part of the displacement zone of the mobile separation membrane in the initial state in a substantially projected region of the discharge port along the center line of the discharge port during the return of the mobile separation membrane to the second flow path as a result of the contraction of the bubbles. As an apparatus for specifically implementing the "displacement step" characterizing the present invention as described above, the structure described below can be mentioned In addition to this, other structures that are covered by the technical idea of this invention and which are capable of carrying out the displacement step are encompassed by this invention The term "steering regulation" mentioned hereinbelow encompasses the structure of the mobile separation membrane itself (as it can be, for example, the distribution of the elasticity and the combination of the elongated deformant part and the non-deformed part), the additive members acting on the mobile separation membrane or on the structure of the first flow path, and the combinations of these. The term "displacement region" or "mobile region" of the mobile separation membrane referred to herein encompasses the region of displacement and the region in which displacement is allowed. A common liquid discharge head according to this invention comprises a first flow path communicating with a discharge port to discharge a liquid, a second flow path provided with a bubble forming zone to form bubbles operating a generating element of energy in a liquid, and a moving separation membrane to substantially separate the first flow path and the second flow path from each other and effect the discharge of the liquid by causing the displacement with the bubbles on the upstream side from the discharge port in relation to the flow of liquid I in the first flow path, whose head of discharge of the liquid is characterized by being provided with a device "regulator of the direction to regulate the direction of the mobile separation membrane during the displacement of the moving separation membrane towards the second flow path accordingly • the contraction of the bubbles. The discharge head of the liquid is further characterized by the fact that the steering regulating device is a mobile member opposite the bubble-forming zone through the moving membrane and provided in the direction of the discharge port with a free end. and the movable member and the mobile separation membrane are at least partially joined together. The discharge head of the liquid of this invention is characterized by the fact that a heating element for emitting the heat for the formation of the aforementioned bubbles is provided with a position in which the bubble-forming zone is opposite to the member mobile.
The liquid discharge head of this invention is further characterized by the fact that the downstream part of the bubbles generated in the bubble forming zone contains the bubbles that are generated on the downstream side from the center of the heating element area. aforementioned. The liquid discharge head of this invention is further characterized by the fact that the above-mentioned movable member has the above-mentioned free end thereof mentioned placed on the side of the discharge port from the center of the area of the heating element. The liquid discharge head of this invention is further characterized by the fact that the mobile member mentioned above has the shape similar to a plate. The liquid discharge head of this invention is further characterized by the fact that the mobile separation membrane is formed of a resin. The liquid discharge head of this invention further characterized by being provided with a first common liquid chamber for storing a liquid to be fed to the first flow path and a second common liquid chamber for storing a liquid to be fed to the second path of liquid. flow. The liquid discharge head of this invention is further characterized by the fact that the liquid to be fed to the first flow path, and the liquid to be fed to the second flow path are different liquids. The liquid discharge head of this invention is further characterized by the fact that the liquid to be fed to the second flow path is greater than the liquid to be fed to the first flow path in at least one of the properties, that is, low viscosity, property of bubble formation and thermal stability. The . The liquid discharge head of this invention is further characterized by the fact that the front end portion of the mobile separation membrane is positioned so that the extension thereof is placed on the lower part of the discharge port and separated from the the plate with holes that has the discharge port formed in it. The discharge head of the liquid of this invention is further characterized by the fact that a lower displacement regulating part which allows the mobile member to have an amplitude greater than the amplitude of the second flow path is placed towards the free end of the movable member . The discharge head of the liquid of this invention is further characterized by the fact that the mobile separation membrane is equipped with a relaxed or low-tension part. Since this invention is constructed as described above, the mobile separation membrane placed in the bubble forming zone is spread by the pressure produced by the formation of the bubbles and the movable member placed in the mobile separation membrane moves towards the first flow path and the mobile separation membrane is extended by the pressure mentioned above in the • direction of the discharge port on the side of the first flow path. As a result, the liquid is discharged efficiently with high discharge force through the discharge port. When the mobile separation membrane is provided in the deformation zone thereof with a part with low tension, the discharge head of the liquid is allowed to acquire a greater discharge force more efficiently because the volume of the bubbles act more effectively over the deformation of the mobile separation membrane due to the pressure generated by the bubbles and because the movable member moves more widely towards the first flow path and the mobile separation membrane extends in the direction of the discharge while moving in the direction of the port. of download. Since the mobile separation membrane thus elongated returns quickly to the original position by the resilient force that the movable member presents in addition to the pressure which originates from the contraction of the bubbles, the control of the pressure in the acting direction thereof is improved and the speed at which the first flow path is filled with the discharging liquid, the discharge, is raised. of the liquid is achieved stably even during printing to top speed.
In addition, the amount of discharged satellites can be decreased and the quality of a printed image can be improved by attaching the movable member to the movable separation membrane and increasing the return speed by resilience of the movable member. Since the shape of the deformation of the mobile separation membrane can be regulated by the action of the movable member, the quality of an image can be improved by uniformizing the distribution of the flow velocity of the liquid in the flow path during the retraction of the meniscus, unifying the shape of the meniscus and stabilizing the flow direction of the satellites.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A, IB, 1C and ID are cross sections of the directions of the flow path depicted to aid in the description of the first example of the method for discharge of the liquid applicable to the present invention. Figures 2A, 2B, 2C, 2D and 2D are cross sections of the direction of the flow path depicted to assist in the description of the second example of the method for discharge of the liquid applicable to the present invention. Figures 3A, 3B and 3C are cross sections of the direction of the flow path depicted to assist in the description of the displacement step of a • mobile separation membrane in the method for the discharge of the liquid applicable to the present invention. Figures 4A, 4B, 4C and 4D are diagrams of cross-sectional patterns of the direction of the flow path to illustrate the first example of the discharge head of the liquid of the present invention. Figure 5 is a perspective visa of the liquid discharge head shown in Figures 4A to the 4D. Figures 6A and 6B are longitudinal cuts illustrating an example of the structure of a liquid discharge head; Figure 6A represents a head equipped with a protective membrane and Figure 6B represents a head devoid of a protective membrane. Figure 7 is a diagram illustrating a voltage waveform that is applied to a heating element. Figure 8 is a diagram illustrating the state of attachment between a mobile separation membrane and a mobile member. Figures 9A, 9B, 9C and 9D are diagrams of cross-sectional patterns of the flow path direction to illustrate the second example of the liquid discharge head of the present invention, Figures 10A and 10B are diagrams illustrating the projected region of a discharge port of the liquid discharge head. Figures HA and 11B are diagrams of cross-sectional patterns of the direction of the flow path to illustrate the third example of the liquid discharge head of the present invention. Figure 12 is a model diagram illustrating an example of the structure of the liquid discharge head of this invention. Figure 13 is an exploded perspective view illustrating an example of the structure of the discharge head of the liquid of this invention. Figures 14A, 14B, 14C, 14D, 14E, 14F, 14G and 14H are diagrams to aid in the description of a process for manufacturing a mobile separation membrane in the discharge head of the liquid of this invention. Figures 15A and 15B are cross sectional diagrams of the liquid flow direction illustrating the mode of the second embodiment of the liquid discharge head of this invention.
DESCRIPTION OF THE PREFERRED MODALITIES The modes of incorporating the present invention will be described below in relation to the accompanying drawings. [Examples applicable to the embodiment of the invention] Now two examples will be described that are applicable to the embodiment of the present invention. Figures 1A to 1E, 2A to 2E and 3A to 3C are diagrams depicted to assist in the description of the examples of the liquid discharge method that are applicable to the present invention. A discharge port is placed in the terminal area of a first flow path. On the upstream side of the discharge port (in relation to the flow direction of a discharging liquid in the first flow path), the displacement zone of a mobile separation membrane capable of being displaced as the bubbles formed grows. A second flow path is adapted to store a. bubbling liquid or filled with the bubbling liquid (preferably adapted to allow recharging or allow the bubbling liquid to produce a movement) and equipped with a bubble-forming zone. In this example, the bubble forming zone is located in the upstream area from the side of the discharge port in relation to the flow direction of the aforementioned discharging liquid. In addition, the separation membrane is allowed to have a length greater than an electrothermal conversion element forming the bubble producing zone and consequently is endowed with a mobile region. A stationary part (not shown) is provided between the terminal part of the upstream side • of the electrothermal conversion element and the common liquid chamber of the first flow path in relation to the aforementioned flow direction, preferably in the terminal part of the upstream side before mentioned. The range in which the separation membrane has substantial movement, therefore, must be understood from Figures 1A to 1E, 2A to 2E and 3A to 3C. The state of the mobile separation membrane represented in these diagrams represents all the elements as the elasticity and thickness of the mobile separation membrane itself or the factors that are derived from other additional structures. (First example) Figures 1A to 1E comprise cross sections of the directions of the flow path depicted for help in describing the first example of the method of • the discharge of liquid applicable to this invention (wherein the displacement step contemplated by this invention starts in the middle of the length of the discharge passage of liquid). In this example, as illustrated in FIGS. 1A to 1E, a first flow path 3 which communicates directly with a discharge port 11 is filled with the first liquid that is supplied from a flow chamber. common liquid 143 and a second flow path 4 provided as a bubble forming zone 7 is filled with a bubbling liquid that forms a bubble with application of thermal energy provided by a heating element 2. A moving separation membrane 5 to separate the first flow path 3 and the second flow path 4 of one another is placed between the first flow path 3 and the second flow path 4. The moving separation membrane 5 and a plate with hole 9 are tightly fitted to each other and do not allow liquids in the two flow paths to mix with each other. The mobile separation membrane 5 in general does not manifest directional property while moving through the bubbles generated in the bubble-forming zone 7. On the other hand, there are occasions when this displacement possibly continues to the side of the common liquid chamber that it encounters. greater freedom of movement. This example, which originates from the specific observation directed to this movement of the mobile separation membrane 5, contemplates providing a device for controlling the direction of displacement acting directly or indirectly on the mobile separation membrane 5 itself. it adapts to make the displacement (movement, expansion, elongation, etc.) produced in the mobile separation membrane 5 by the bubbles continuing in the direction of the discharge port.
• In the initial state illustrated in Figure 1A, the liquid in the first flow path 3 is withdrawn in a sealed manner to the discharge port 11 by capillary force. In the present example, the discharge port 11 is locates on the downstream side in relation to the direction of flow of the liquid in the first flow path 3 with respect to the area in which the heating element 2 is projected for the first flow path 3. In the existing state, when the thermal energy is applies to the heating element 2 (a heating resistor measuring 40 μm x 105 μm, in the current mode), the heating element 2 is heated rapidly and the surface of the bubble producing zone 7 makes contact with the second liquid to make it form bubbles by the heat (Figure IB). The bubbles 6 thus generated by heating are based on a boiling phenomenon with membrane formation as described in U.S. Patent No. 4,723,129. These are generated accompanied by extremely high pressure, all at once, throughout the surface of the heating element. The pressure generated at this time propagates in the pressure waveform through the second liquid in the second flow path 4 and acts on the mobile separation membrane 5, with the result that the mobile separation membrane 5 will be displaced and the discharge of the first liquid in the • first flow path 3. As the bubbles 6 generated on the entire surface of the heating element 2 grow rapidly, they take the form of a membrane (Figure 1C). The expansion of bubbles 6 by the very high pressure in the nascent state is further added to the displacement of the mobile separation membrane 5 and, as a result, favors the discharge of the first liquid in the first flow path 3 through the discharge port 11. When the growth of the bubbles 6 further continues, the displacement of the mobile separation membrane 5 gains volume (Figure ID). Until the state illustrated in FIG. ID is reached, the mobile separation membrane 5 continues its elongation so that the displacement of the part on the upstream side 5A of this and the part on the downstream side 5B thereof are substantially equal in relation to the central part 5C of the area of the mobile separation membrane 5 opposite the heating element 2. 20 As the bubbles 6 grow longer after this, the bubbles 6 and the mobile separation membrane 5 continue their displacement are repeatedly displaced in the direction of the outlet of the discharge instead of the upstream side part 5A which in the part lateral downstream 25B and, as a result, the first liquid in the first flow path 3 moves directly in the direction of the outlet of the discharge 11 (Figure 1E). The efficiency of the discharge is also improved due to the incorporation of the step to effect the displacement of the moving separation membrane 5 in the discharge direction on the downstream side so as to allow direct movement of the liquid in the direction of the discharge port as described above. The fact that the movement of the liquid to the upstream side is Relatively lowering gives rise to a favorable effect in filling the liquid (filling from the upstream side) in the nozzle, specifically the displacement zone of the mobile separation membrane 5. When the mobile separation membrane 5 itself moves in the direction of the discharge port to induce a change of state from Figure ID to Figure 1E as illustrated in the respective diagrams of Figure ID and Figure 1E, the efficiency of the discharge and the efficiency of the aforementioned filling before they can also be improved and, At the same time, the discharge amount can be raised by inducing the transfer of the portion of the first liquid in the projection region of the heating element 2 in the first flow path 3. (Second example) FIGS. 2A to 2E are cross sections of the direction of the flow path represented to assist in the description of the second example of the method for discharging liquid that are applicable to the present invention (wherein the displacement step contemplated by this invention starts from the initial stage). This example is basically identical in structure to the first example described above. A first flow path 13 communicating directly with the discharge port 11 is filled with the first liquid supplied from the first common liquid chamber 143 and a second flow path 14 adapted with a bubble forming zone 17 is filled with a bubbling liquid that emits bubbles upon exposure to thermal energy supplied by a heating element 12. A mobile separation membrane 15 adapted to separate the first flow path 13 and the second flow path 14 from one another is interposed between the first flow path 13 and the second flow path 14. The mobile separation membrane 15 and a plate with orifice 19 are hermetically adjusted to each other and do not allow the liquid in the two flow paths to mix with each other. In the initial state illustrated in Figure 2A, in the same way in Figure 1A, the liquid in the first flow path 13 is extracted in a hermetic manner to the discharge port 11 by the capillary force. In the present example, the discharge port 11 is located on the downstream side in relation to the area in which the heating element 12 projects to the first flow path 13. In the existing state, when the thermal energy is provided the heating element 12 (a heating resistor measuring 40 μm x 115 μm, in the current mode), the heating element 12 is heated rapidly and the surface of the bubble forming zone 17 in contact with the second liquid causes the second liquid form bubbles by heat (Figure 2B). The bubbles 16 thus generated by heating are based on a boiling phenomenon with membrane formation as described in U.S. Patent No. 4,723,129. These are generated accompanied by extremely high pressure all at once on the entire surface of the heating element. The pressure generated at this time propagates in the pressure waveform through the second liquid in the second flow path 14 which acts on the mobile separation membrane 15, with the result that the mobile separation membrane 15 will be displaced and discharge of the first liquid will begin in the first flow path 13. As the bubbles 16 generated on the entire surface of the heating element 12 grow rapidly, they finally take the form of a membrane (Figure 2C). The expansion of the bubbles 16 by the very high pressure in the nascent state further adds displacement to the mobile separation membrane 15 and, as a result, favors the discharge of the first liquid in the first flow path 13 through the discharge port 11. At this time, the mobile separation membrane 15 has the downstream side portion 15B of the movable part thereof displaced more than the upstream side portion 15A thereof from the initial state as illustrated in Figure 2C. The first liquid in the first flow path 13, therefore, moves to the discharge port 11 with superior efficiency from the initial state. When the growth of the bubbles 16 advances further after this, the displacement of the mobile separation membrane 15 is proportionally lengthened (Figure 2D) because the displacement of the mobile separation membrane 15 and the growth of the bubbles is favored in FIG. relationship with the state illustrated in Figure 2C. Specifically, since the downstream side portion 15D of the movable region is displaced to a greater extent in the direction of the discharge port than the upstream side portion 15A and the central portion 15C, the first liquid in the first flow path 13 is moves directly with acceleration in the direction of the discharge port. Since the displacement of the upstream side portion 15A is small throughout the process, the movement of the liquid in the upstream direction decreases. The method of discharge of liquid in this example, therefore, can improve the efficiency of the discharge, especially the discharge velocity and can also favorably stabilize the filling of the liquid in the nozzle and the volume of the drops of liquid discharged .
When the growth of the bubbles 16 further continues after this, the downstream side part 15B and the central part 16C of the mobile separation membrane 15 also moves and lengthens in the direction of the discharge port to favor the aforementioned effect , namely, the improvement of discharge efficiency and discharge velocity (Figure 2E). Specifically, since the mobile separation membrane form 15 in this case is elongated not only in the cross section but also in the size of the displacement and elongation in the direction of the amplitude of the flow path, the operating region for moving the first liquid in the first flow path 13 is increased and the efficiency of the discharge is improved synergistically. Since the shape of the displacement of the mobile separation membrane 15 at this time resembles the shape of a human nose, it will be specifically mentioned as "nose shape". The nose shape is considered to comprise the shape of the letter "S" in which the point B located on the upstream side in the initial state takes a position on the downstream side from the point A located on the downstream side in the initial state as illustrated in Figure 2E and the manner in which points A and B take equivalent positions as illustrated in Figure 1E. (Examples of displacement applicable to the mobile separation membrane) Figures 3A to 3C are cross sections of a direction of the flow path depicted to assist in describing the displacement step of the mobile separation membrane in the discharge method of liquid according to this invention. This example is proposed to center its description specifically on the range of motion of the mobile separation membrane and the change in its displacement, it will omit the illustration of the bubbles, the first flow path and the discharge port. All the • Relevant diagrams, such as a basic structure, assume that the portion of a second flow path 24 that closely approximates the projection zone of a heating element 22 itself constitutes a bubble forming zone 27 and the second flow path 24 and, a first flow path 23 are substantially separated by the mobile separation membrane 25 in a constant manner, i.e., from the initial state during travel, a discharge port is placed on the downstream side and a portion for the feeding the first liquid on the upstream side with the downstream side terminal part (line H in the diagram) of the heating element 22 as the limiting line. The terms "upstream side" and "downstream side" as used herein and the following examples are understood in relation to the flow direction of the liquid in the relevant flow path as viewed from the central part of the mobile range of the liquid. mobile separation membrane. The method using the structure illustrated in Figure 3A incorporates in this from the initial stage a displacement step of a mobile separation membrane 25 from the initial state, in sequence, in the order of (1),. (2), Y (3) and to a greater extent on the downstream side than on the upstream side and particularly exceeds the improvement of the discharge velocity because it functions to raise the discharge efficiency and, at the same time allows the displacement on the current side down to impart to the first liquid in the first flow path 23 such movement as to be forced outwards in the direction of the discharge port. In the structure of Figure 3A, the aforementioned mobile range is assumed to be substantially fixed.
In the structure illustrated in Figure 3B, the mobile range of the mobile separation membrane 25 is displaced or enlarged to the discharge port as the mobile separation membrane 25 moves sequentially in the order of (1), (2) and (3) in the diagram. In the resulting form, the aforementioned moving range has the upstream side of this fixed. The discharge efficiency can also be increased in this case because the mobile separation membrane 25 moves to a greater extent on the downstream side than on the upstream side thereof and because the bubbles grow in the direction of the port of travel. discharge. In the structure illustrated in Figure 3C, although the mobile separation membrane 25 changes from the initial state (1) to the state shown in (2) in the diagram, the upstream side and the downstream side move away from each other. uniformly or the upstream side is displaced more than the downstream side. As the bubbles grow more than (3) to (4) in the diagram, the downstream side moves more than the upstream side. As a result, even the first liquid in the upper part of the mobile zone can be moved in the direction of the discharge port, the discharge efficiency can be improved, and the same time, the discharge amount can be increased. Further, in the passage illustrated in (4) of Figure 3C, since a certain point U of the mobile separation membrane 25 moves more towards the discharge port than the point D located in the downstream than the point U in the initial state, the efficiency of the discharge can be increased more by the part that is out towards the discharge port as a result of the expansion. The state taken accordingly will be referred to as "nose shape" as mentioned above. The methods of liquid discharge that are incorporated in these steps as described above are applicable to the present invention. The components illustrated in Figures 3A to 3C do not always work independently of each other. The steps that incorporate these components herein are in the same manner applicable to this invention. The step that includes the formation of the nose shape is not limited to the structure illustrated in Figure 3C. This can be incorporated into the structures illustrated in Figures 3A and 3B. For the mobile separation membrane that is used in the structure of Figures 3A to 3C, the expansion capacity is not important and the preparatory release of relaxation is sufficient. The thickness of the mobile separation membrane that appears in the diagram has no significant dimensional. The term "device for controlling the address" as used in the present specification applies to at least one of all the members (means) performing the "scrolling" specified by the present invention, as such, for example, those that derived from the structure or characteristic of the mobile separation membrane itself, those belonging to the operation or arrangement of the bubble-forming device with respect to the mobile separation membrane, to those related to the resistance of the fluid offered by the vicinity of the zone bubble former, those that act directly or indirectly on the mobile separation membrane or those that effect a control of the displacement or elongation of the mobile separation membrane. The embodiments that incorporate a plurality (two or more) of these devices for steering control as mentioned above, therefore, are naturally included by the present invention. The examples that will be mentioned hereinafter do not make definite mention of the arbitrary combination of a plurality of address control devices. Notwithstanding this, the present invention need not be limited by the following examples. (Example 1) (Mode of the first embodiment) (Example 1) Figures 4A to 4D are model diagrams of the cross section of the direction of a flow path to illustrate the first example of the discharge head of the liquid of the present invention; Figure 4A represents the state of the discharge head of the liquid during the absence of discharge of liquid, Figure 4B represents the state of the bubbles 40 increased to the largest volume, Figure 4C represents the state of the bubbles in the • contraction process and, 10 La. Figure 4D represents the state of the bubbles after substantial differentiation. The present liquid discharge head causes the formation of bubbles in a bubble forming zone 30 of the second flow path 4 near the element heater 2 (40 x 105 μm, for example) because this heating element 2 which is placed on the suction device 1 heats the liquid in the bubble-forming zone 30 and induces boiling with membrane formation as illustrated in FIG. Figure 4A. This zone and the first flow path 3 in communication with the discharge port 11 are substantially separated from one another by the mobile separation membrane 5 and, consequently, the liquid of the first flow path 3 and that of the second. trajectory flow 4 do not mix with each other. These liquids of the first and second flow paths 3 and 4 can be the same or different, depending on the purpose of use. Further, in the case of this invention, a mobile member 26 having a free end provided on the port side of discharge is placed opposite to the displacement zone of the mobile separation membrane 5 which is displaced by the bubbles formed in the bubble-forming zone 30. It is preferred that the free end is placed on the side of the discharge port. from center F of the area of the heating element 2 for the sake of the moving member itself 26. In Figure 4B it is noted that the bubble 40 formed by the heating element 2 has grown to the substantially larger volume but the displacement zone of the mobile separation membrane 5 as a whole has been displaced and elongated towards the discharge port because the directions of displacement and elongation of the mobile separation membrane 5 are regulated by the mobile member 26. Specifically, the displacement and elongation towards the discharge port is most effectively carried out because the free end of the movable member 26 is placed on the side of the discharge port from the center F of the area of the heating element 2 as described above and the area of displacement of the membrane mobile separation 5 can be controlled almost completely.
Referring to Figure 4C, although the bubbles 40 are in the shrinkage process, the main drops (liquid drops) 32 more rapidly separate the liquid in the flow path 3 because the mobile member 26, under of the resilience of this, works to accelerate the contraction of the mobile separation membrane 5 and tends to drag the meniscus 31A and 3ID rapidly through the discharge port 11 in the flow path 3. As a result, the satellites 33 illustrated in Figure 4D are forced to lose length and volume as well. Therefore, the images produced contain satellites only sparsely and present definition and quality. In addition, since the tape contains only low humidity, it hardly stains the face and the interior of the printer and adds remarkably to the reliability of the printing.
Referring to Figure 4C, the flow velocity of the liquid within the first flow path 3 during the attraction of the meniscus 31A and 31B varies with the location.
Specifically, between the closest side 31B and the far side 31A of the mobile separation membrane 5 through the center line E of the discharge port 11, the flow velocity is possibly greater at the nearest side 31B which has resistance less than the flow. The difference in shape between the meniscus 31A and 31B affects the direction of the satellites 33. When this difference is markedly deviated, the inclination itself it manifests as a deviation from the shock accuracy of the liquid droplets on the recording medium. The lost balance also causes a deviation of the shock due to the difference in direction of the discharge of the main drops 32 and the satellites 33. The consequence is a print known as satellite printing which deteriorates the quality of the image. By making the junction between the movable member 26 and the rapid adhesion to the mobile separation membrane 5 airtight, however, the contraction speed of the mobile separation membrane 5 is increased by the resilience on the opposite side rather than on the side of the discharge port, i.e., the contraction rate VA of the mobile separation membrane 5 in the upstream side (the side opposite the discharge port) of the mobile zone intensifies more than the contraction speed VB of this on the downstream side (the side of the discharge port) to satisfy the VB <ratio; VA, with the result that the flow velocity B on the side closest to the mobile separation membrane 5 will be limited to increase excessively, the flow velocity A on the side which offers greater resistance to flow will be higher and will be The simultaneous control of the two flow velocities A and B is therefore carried out. Therefore, the meniscuses 31A and 31B are symmetrical in shape in relation to the center line E of the nozzle and the direction of the satellites 33 equals the main drops. 32. In addition, the efficiency of the supply of the liquid from the upstream side can be increased, the filling property can be improved and the driving speed increased by raising the contraction speed of the mobile separation membrane 5 on the upstream side. Figure 5 is a perspective view of the liquid discharge head of Figures 4A to 4D illustrating substantially the same state as Figure 4B. In the structure depicted therein, an electric current is fed by a cable 34 to the heating element 2 as an electrical resistance. Now, the structure of the substrate device 1 which is provided with the heating element 2 which fulfills the function of imparting heat to the liquid will now be explained. Figures 6A and 6B are longitudinal cuts illustrating an example of the structure of the discharge head of the liquid according to this invention; Figure 6A depicts a head adapted with a protective membrane that will be described specifically herein below, and Figure 6B depicts a head devoid of an anti-cavitation layer as a membrane. protective As illustrated in Figures 6A and 6B, in the device substrate 1 sits a second flow path 4, the mobile separation membrane 5 intended to serve as a separation wall, the movable member 26, the first flow path 3 and a slotted member 50 equipped with a groove intended to function as the first flow path 3. In the substrate device 1, an oxide film silicon or silicon nitride film llOe aimed at providing insulation and heat storage is formed on a silicon HOf base body, for example, a HOd electrical resistance layer 0.01 to 0.2 μm thick, hafnium boride (HfB2 ), tantalum nitride (TaN), or aluminum tantalum (TaAl), for example, proposed to form a heating element and two wire electrodes 110c, of 0. 2 to 1.0 μm thick, of aluminum, for example, are superimposed on it as a pattern. - The electric resistance layer HOd is prompted to emit heat by applying a voltage from the two wired electrodes 110c to the electrical resistance layer HOd thereby providing the supply of an electric current to the electrical resistance layer llOd. In the electrical resistance layer llOd intervening between the wired electrodes 110c, a protective layer 110b, 0.1 to 0.2 μm thick, silicon oxide or silicon nitride, for example, and an anti-cavitation layer 110a, from 0.1 to 0.6 μm thick, of tantalum, is formed, for example, it is also superimposed on it to protect the electrical resistance layer llOd of various liquids such as ink. This metallic material such as tantalum (Ta), for example, is used for the anti-cavitation layer 110a because the pressure and the shock wave that originates during the birth and extinction of the bubbles are very strong and seriously degrade the durability of the rigid and fragile oxide film. Optionally, the discharge head can be formed in such a structure by combining liquids suitably, flow path designs and strength materials as the anti-cavitation layer is omitted as a protective layer. An example of this structure is illustrated in Figure 6B. An iridium-tantalum-aluminum alloy, by. example, it can be mentioned as material for the electrical resistance layer which has no use for a protective layer. Specifically, for purposes of this invention, the absence of the protective layer becomes more advantageous because the bubbling liquid becomes suitable to form the bubbles being separated from the discharging liquid. The structure of the heating element 2 in the mode of the above-described embodiment is only required to have the electrical resistance layer 110 of (heating element) interposed between the wired electrodes 110c. Otherwise, the protective layer 110b may be incorporated herein to protect the electrical resistance layer 11Od. The present example has been represented by adopting for the heating element 2 a heating element formed of a resistant layer which is capable of emitting heat in response to an electrical signal. This invention need not limit the heating element 2 to this specific structure, but only requires that it be capable of producing in it. Bubbling liquid bubbles when necessary to cause discharging liquid discharge. As the heating element, for example, a photothermal converting device emitting heat upon receiving the light as a laser light beam or a heating device equipped with a heating element emitting heat upon receiving a high frequency can be adopted. In addition to the electrothermal converter element which is composed of the electrical resistive layer llOd forming a heater element and the wired electrode 110c for supplying an electrical signal to the electric resistive layer llOd, the aforementioned substrate element 1 is provided with functional elements such as transistors, diodes, retention circuits and displacement recorders that are used to selectively drive electrothermal conversion elements integrated in an integrated manner during the semiconductor production process. For the purpose of discharging the liquid by driving the heating element provided in the substrate device 1 as already described, the resistive layer 11Od interposed between the wired electrodes is caused to generate heat immediately by applying a rectangular pulse to the electrical resistive layer 11Od a through the wire electrode 110c. Figure 7 is a diagram representing the voltage waveform to be applied to the heating element 2 in the form of an electrical resistant layer as illustrated in Figures 6A and 6B. In the head contemplated by the example already described, the heating element is established by driving, by applying to it, an electrical signal at 6 kHz low, the conditions of 24 V voltage, 7 μsec pulse amplitude and 150 mA current electrical and, consequently of the operation performed as described above, an ink, such as a liquid to be discharged, is discharged through the discharge port. The conditions for the driving signal in this invention need not be limited to those mentioned above. It is only required that the driving signal be able to cause the bubbling liquid to form bubbles perfectly. In the present example, the mobile separation membrane 5 and the mobile 26 are constructed in this manner so that they adhere rapidly to each other while the bubbles 40 are in the process of contraction as described above. An example of the structure that is formed accordingly is illustrated in Figure 8 which corresponds to Figure 4D. In this example, the movable separating membrane 5 is attached to the lateral free end of the movable member 26 in the adhesive portion 26a thereof. Due to this connection, the mobile separation membrane 5 is limited by the rigidity of the mobile member 26 to be displaced towards the second flow path by the contraction of the bubbles 40. As a consequence, the directionality of the satellites described in the previous example it can be improved, the number of satellites is decreased to the extent of improving the quality of the printing and the refilling property improves without presenting the large displacement of the mobile separation membrane 5 towards the second flow path added to the amount of retraction of the meniscus. (Example 2) Figures 9A to 9D and Figures 10A and 10B are model diagrams of the cross sections in the direction of liquid flow illustrating the second example of the liquid discharge head of this invention.
In the same manner as in the first example, Figure 9A illustrates the state of the liquid discharge head during the absence of liquid discharge and Figure 9B and Figure 9D illustrate the condition thereof in the presence of liquid discharge. In the first example, the front end portion of the movable separating membrane 5 is placed below the bottom of the discharge port 11 to make contact or closely approximate a plate with holes 51. In the present example, it is disposed that at least part of the displacement zone of the mobile separation membrane 5 in its initial state is present in the projected zone H of the discharge port 11 along the center line E of the discharge port 11. The rest of the structure is the same as in the first example. This structure, contrary to that of the first example, constitutes in itself an example of a decrease in the resistance of the flow path and elevation of the flow velocity B when the effect of operating the mobile member on the side furthest from the membrane moving separation 4 and the flow rate A increases excessively and, consequently, achieves balanced control of the flow velocities A and B. As a result, the meniscus 31A and 31B can be made symmetric in shape in relation to the centerline E of the discharge port 11 and the direction of the satellites can be matched to that of the main drops 32. Incidentally, the projected zone of the discharge port 11 along the center line of the discharge port 11 as illustrated in FIG. Figure 10A, comprises the projected region 1 of the side hole of the flow path. Even though the center line E of the discharge port 11 forms an angle with the flow path as illustrated in FIG. 10B, this invention can be applied to the structure under discussion by the prine already described as long as the discharge port 11. is on the downstream side of the displacement zone of the mobile separation membrane 5. (Example 3) Figures HA and 11B are cross-sectional diagrams of the direction of the flow path illustrating the third example of the liquid discharge head of this invention; Figure HA represents a cross section taken in the direction of the flow path and figure 11B a plan view of the direction of the flow path. The present example, as illustrated in Figures HA and 11B, differs from the first example only in that a limiting part of the lower displacement 26B capable of allowing the movable member 26 to have a greater amplitude than the second flow path 4 is located near the free end of the movable member 26 and the movable separating membrane 5 and the movable member 26 are quickly joined together in the adhesive part 26A. The rest of the construction is the same as the first example. In the head of discharge of liquid produced in the structure described above, when the mobile separation membrane 5 and the mobile member 26 tend to move towards the second flow path 4 as a consequence of the contraction of the bubbles (not shown), the movable separating membrane 5 is also constrained by the adhesive part 26A from moving towards the second flow path 4 because the portion limiting the lower displacement 26b prevents the movable member 26 from moving to the second flow path 4 of the position that takes before the displacement. As a result, meniscus retraction caused • proportionally by the decrease in the volume of the liquid due to the displacement in the first flow path 3 when the mobile member 26 moves towards the second flow path 4, it can be repressed and the filling time can be curtained [sic]. The part that limits the above mentioned lower displacement 26b may be in such a structure as to effect partial repression of the displacement towards the second flow path 4 instead of causing the displacement towards the second flow path 4 completely as in the present example. Next, an example of the structure of a discharge head that has two common liquid chambers will be described, without sacrificing the effort of dissimulating the number of component parts, allows the efficient introduction of different liquids to the perfectly separated common liquid chambers, and also allows a reduction in cost. Figure 12 is a model diagram illustrating an example of the structure of the liquid discharge head according to this invention. In this diagram, like component parts shown in Figures HA to HE to HA and 11B are defined with the same reference numerals. These component parts will be omitted from the following specific description. The slotted member 50 in the liquid discharge head illustrated in Figure 12 is roughly composed of the plate with holes 51, a plurality of slots intended to form, as many first flow paths 3, and a recess intended to form a first common liquid chamber 48 adapted to communicate simultaneously with the plurality of first flow paths 3 and to supply a liquid (discharge liquid) to these first flow paths 3.
The plurality of the first flow paths 3 is formed by attaching the movable separation membrane 5 to the lower side portion of the slotted member 50. The slotted member 50 is provided with the first liquid feed path 20 extending from the upper part of the member slot 50 towards the first common liquid chamber 48 and also with the second liquid supply path 21 extending from the top of the slotted member 50 through the mobile separation membrane 5 to the second common liquid chamber 49. The member mobile 26 tightly attached to the upper side of the aforementioned mobile separation membrane 5 is arranged to face the bubble-forming zone 30 with the free end 28 thereof disposed in the direction of the discharge port. The free end of the movable member is placed on the side of the discharge port from the center of the area of the heating element 2. The first liquid (discharging liquid) is supplied through the first liquid feeder path 20 and the first liquid chamber common 48 towards the first flow path 3 as shown by the arrow mark C in Figure 12, and the second liquid (bubbling liquid) is fed, through the second liquid feeder path 21 and the second liquid chamber common 49 to the second flow path 4 as indicated by an arrow mark D in Figure 12. Although the present example is represented with the second liquid supply path 21 and the second common liquid chamber 49 to the second flow path 4 as indicated by an arrow mark D in Figure 12. Although the present example is represented with the second liquid feed path 21 and the first liquid feed path 20 parallel to each other, the present invention does not need to use these trajectories in this specific distribution. These can be incorporated in any arbitrary distribution as long as they penetrate the mobile separation membrane 5 disposed outside the first common liquid chamber 48 and communicates with the second common liquid chamber 49. The thickness (diameter) of the second path of Liquid feed 21 is decided by taking into account the amount of the second liquid to be supplied. The cross section of the second supply path of the liquid 21 need not be a circle but can be a rectangle, for example. The second common liquid chamber 49 can be formed by making a partition of the slotted member 50 with the moving separation membrane 5. Specifically the second common liquid chamber 49, and the second flow path 4 can be formed to form a frame of the common liquid chamber and a wall of the second dry film flow path on the substrate device 1 by attaching to the substrate device 1, the joint obtained by combining the mobile separation membrane 5 with the slotted member 50 by adjusting the mobile separation membrane 5 in your position Figure 13 is an exploded perspective view illustrating an example of the structure of the liquid discharge head of this invention. In the present mode, the substrate device 1 having a plurality of electrothermal conversion elements proposed as the heating element .2 to generate the heat necessary for the formation of bubbles in the bubbling liquid by boiling with membrane formation as described above. it is formed on a metal support member 70 such as aluminum. In the substrate device 1, a plurality of slots intended to form the second flow paths 4 defined by the second walls of the flow path, a sunken portion intended to form the second common liquid chamber (common bubbling liquid chamber) 49 which communicates with the plurality of the second flow paths 4 and feeds the bubbling liquid several times into the second flow paths 4, and the movable separating membrane 5 adapted with the movable member 26 is provided.
The slotted member 50 is provided with a slit adapted to form the first flow path (discharge path of the discharging fluid) 3 in combination with the mobile separation membrane 5, a recess intended to form the first common liquid chamber (chamber of common discharging liquid) 48 communicates with the discharge liquid flow paths and feeds the discharging liquid several times towards the first flow paths 3, the first liquid feed path (discharge path of the discharging liquid) 20 to feed the liquid. liquid discharger to the first common liquid chamber 48, and the second liquid feed path (bubbling liquid feed path) 21 to feed the bubbling liquid into the second common liquid chamber 49. The second liquid feed path 21 it is passed through the mobile separation membrane 5 arranged outside the first common liquid chamber 48 and communicates with the second common liquid chamber 49 and, due to this communicating path, the bubbling liquid is allowed to be supplied to the second common liquid chamber 48 without mixing it with the discharging liquid. In the relative distribution ratio of the substrate device 1, the mobile separation membrane 5 adapted with the mobile member 26 and the slotted member 50, the mobile member 26 is positioned in correspondence with the heating element 2 of the substrate device 1 and the first path 3 is installed in correspondence with the movable member 26. Although the present embodiment is represented by providing the second liquid feed path 21 positioned in a slotted member 70, this invention allows the incorporation of a plurality of the second feed paths of the liquid. liquid 21 depending on the amount of relevant liquid that is going to be supplied. The cross-sectional areas of the first liquid feed path 20 and the second liquid feed path 21 can be decided in proportion to the quantities of liquid to be fed. The component parts of the slotted member 50 can be reduced in size to optimize these areas in their cross section.
According to the present mode of the embodiment, the number of the component parts can be decreased, shorten the operation process and reduce operating costs due to the fact that the second liquid supply path 21 for supplying the second liquid to the second flow path 4 and the first liquid feed path 20 for supplying the first liquid to the first flow path 3 are formed in the same slotted upper plate as the slotted member 50 as described above. The supply of the second liquid to the second common liquid chamber 49 communicating with the second flow path 4 is effected with the second flow path 4 in the direction of penetration of the mobile separation membrane 5 separating the first and the second liquid with each other. Since the process of gluing the mobile separation membrane 5, the grooved member 50 to the substrate device 1 having the heater element 2 formed therein, can therefore be carried out at the same time, the manufacturing facility is improved, Increases the precision of bonding by gluing is improved and the liquid discharge is performed satisfactorily. The supply of the second liquid to the second flow path 4 is effected in an infallible manner because the second liquid is fed through the mobile separation membrane 5 to the second common liquid chamber 49. Therefore, the discharge is stabilized of liquid because the supply is widely secured Due to the structure incorporated herein, the mobile separation membrane 5 having a mobile member sealingly attached to the upper side thereof as described above, the discharge head of the liquid of this invention causes discharge of the liquid with a higher discharge force and high discharge efficiency and at a higher speed compared to the conventional liquid discharge head. The bubbling liquid that is used can be a liquid of the quality as specified above. As concrete examples of bubbling liquid suitable for use herein, there can be mentioned methanol, ethanol, n-propanol, isopropanol, n-hexane, n-heptane, n-octane, toluene, xylene, methylene dichloride, triclene, Freon TF , Freon BF, ethyl ether, dioxane, cyclohexane, methyl acetate, ethyl acetate, acetone, methyl ethyl ketone, water and mixtures thereof. As the discharging liquid, a variety of liquids can be used without reference to foaming and thermal properties. It is possible to effectively use a liquid that is still incapable of poor foaming, a liquid that degenerates or is easily damaged by heat or a liquid of unduly high viscosity that has not been easily discharged into a conventional discharge head. As the proper quality for any discharging liquid, it is preferred that the discharging liquid used herein avoid interference with the action of discharge or formation of bubbles or with the operation of the mobile separation membrane or the mobile member due to the reaction with itself or with the bubbling liquid. As the discharge liquid for recording a highly viscous ink can be used. In addition, it is possible to use liquids such as medicines and perfumes that are vulnerable to heat. The bubble-forming liquids, the discharging liquids of the following compositions were used in various combinations to effect discharge of the discharging liquids and to produce records. A review of the records shows that not only liquids with a viscosity of 10 and a peak cp that were not easily discharged with the conventional head but also very high viscosity liquids such as 150 cp can be downloaded in a satisfactory manner to produce image records of superior quality Bubbling liquid 1- ethanol 40% by weight Water 60% by weight Bubbling liquid 2- water 100% by weight Bubbling liquid 3- isopropyl alcohol 10% by weight Water 90% by weight Discharging liquid 1- carbon black 5% by weight (pigment ink approximately 15 cp) styrene-acid copolymer dispersion agent acrylic-ethyl acrylate (oxidation 140, weighted average molecular weight 8,000) 1% by weight Monoethanol amine 0.25% by weight Glycerin 6.9% by weight Thiodiglycol 5% by weight Ethanol 3% by weight Water 16.75% by weight Liquid discharger 2 (55 cp) Polyethylene glycol 200 100% by weight Liquid discharger 3 (150 cp) Polyethylene glycol 600 100% by weight By the way, in the case of a liquid that until now has been discharged only with difficulty, the low speed of discharge, aggravated the dispersion of discharge directionality and damaged the accuracy of placement of the points on the recording paper and the instability of the discharge resulted in dispersion in the amount of discharge and consequently made the production of an image difficult. of superior quality. In the structure according to the mode of the embodiment described above, however, the formation of bubbles can be achieved widely and stably by the use of the bubbling liquid. This fact allows the improvement of the positioning precision of the liquid drops and the stabilization of the amount of ink discharge and visibly improves the quality of a registered image. Now the process for the production of the discharge head of the liquid of this invention will be described. In a broad sense, the manufacture of the head was effected by forming the wall of a second flow path on the substrate device, by adjusting therein the mobile separation membrane adapted to the movable member and also adjusting therein the grooved member containing a slot to form the first flow path. Otherwise, it was achieved by forming the wall of the second flow path and then joining the grooved member that had adapted thereto the mobile separation membrane adapted to the mobile member, joining it on the wall. The method for manufacturing the second flow path will now be described in greater detail. First, the electrothermal converter element adapted with the heating element made of hafnium boride or tantalum nitride was formed on the substrate device (silicon wafer) by using the same manufacturing device that is used for a semiconductor and then the surface of the substrate device was cleaned for purposes of improving the hermetic adhesion of the surface to a photosensitive resin in the subsequent step. To further improve the hermetic adhesion, it is sufficient to subject the surface of the substrate device to a treatment with ultraviolet light and then apply to the surface treated by rotary coating a solution obtained by diluting a silane coupling agent (made by Nihon Única KK and marketed with the product code of "Al89") at a concentration of 1% by weight with ethyl alcohol. Thereafter, the resulting surface was cleaned and a UV-sensitive resin film (manufactured by Tokyo Ohka KK and marketed under the trade name "Dry Film Odil SY-318") DF was laminated onto the substrate with airtight adhesion of this improved Subsequently, a PM photomask was deposited on the dried DF film and the portion of the dried DF film necessary to become a wall of a second flow path was exposed to ultraviolet light through the PM photomask. This exposure step was carried out by using an instrument (developed by Canon Inc., and marketed with the product code "MPA-600") with an exposure of approximately 600 mJ / cm2. The dried DF film was then developed - with a developer (developed by Tokyo Ohka KK and marketed with the product code "BMRC-3") formed of a mixture of xylene and butyl cellosolve acetate to dissolve the unexposed part and obtain the part exposed and hardened as part of the wall of the second flow path 4. The residue that still persisted on the surface of the substrate device 1 was removed by a treatment of approximately 90 seconds with a device for extracting ashes with plasma (produced by Alukantec Inc., and it is marketed with the product code "MAS-800"). The substrate was then exposed to ultraviolet light projected at 100 mJ / cm2 at 150 ° C for 2 hours to perfectly harden the exposed part. The second flow paths could be formed with superior precision evenly in a plurality of heating boards (substrates devices) manufactured as a cut of the silicon substrate by the method described above. Specifically, the silicon substrate was cut on the individual heater boards 1 with the cutting machine (developed by Tokyo Seimitsu K. K. and marketed with the product code of "AWD-4000") adapted with a diamond plate, 0.05 mm thick. The separate heater boards 1 were fixed with an adhesive agent (manufactured by Toray Industries, Inc. and marketed under the product code "SE4400") on an aluminum base plate. Then, the printed substrate was attached in advance to the aluminum base plate and connected to the heater boards with an aluminum wire of 0.05 mm in diameter. Subsequently, the joints resulting from joining the grooved members joined to the mobile separation membranes were joined aligned to the heater boards obtained as already described. More specifically, the grooved members adapted with the movable separating membranes and the heater boards were aligned with each other and joined and fitted with a rebound sheet. Then, the feeder members of the bubbling-ink liquid were bonded and fitted onto the aluminum base plates. The gaps between the aluminum wires and the gaps between the slotted member, the heater boards and the bubbling-ink liquid feeder members were sealed with a silicone sealant (manufactured by Toshiba Silicone KK and marketed under the product code of "TSE 399") to complete the manufacturing. In forming the second flow paths according to the production method described above, the flow paths can be obtained with superior precision without position deviation of the heaters in the aforementioned heater boards. Specifically, by having the grooved members and the mobile separation membranes joined in advance to each other in the previous step, the positional accuracy of the first flow paths and the moving members can be high. The superior precision production technique described above stabilizes the liquid discharge and improves the print quality. In addition, the fact that the component parts are collectively formed on the microplates allows for quantitative production of the liquid discharge heads at a lower cost. The present mode of the embodiment has been represented using a dry film of the ultraviolet light hardened type for the formation of the second flow paths. Otherwise, the formation of the second flow paths can be obtained by adopting a resin having an absorption band close to the ultraviolet region, specifically a region of 248 nm, laminating the resin, hardening the resulting laminate and directly removing the part. of the laminate that is desired to form the second flow path with a laser cutter. Now we will describe the method for the production of the mobile separation membrane adapted with the mobile member specified above. Figures 14A to 14H are diagrams shown to assist in the description of the manufacturing process of the mobile separation membrane in the liquid discharge head according to this invention. In the beginning a release agent is applied to the silicon mirror (silicon chip) 35 as illustrated in Figure 14A. Then, a liquid polyimide resin intended to form a mobile separation membrane is deposited by # centrifugation coating to form a film (mobile separation membrane)., approximately 3 μm thick, as illustrated in Figure 14B. On the film, a thin metal film 36 is placed by cathodic sublimation in a thickness of 0.1 μm as illustrated in Figure 14C. This thin metallic film 36 is coated with a film, approximately 5 μm thick, as by electrolytic coating, as illustrated in Figure 14D. In the last film formed, forms a resistance pattern 38 as illustrated in Figure 14E. Then, the metal part of the resulting laminate, except for the resistance 38, is flaked with etching as illustrated in Figure 14F and the resistor 38 is removed as is illustrated in Figure 14G. Finally, the one-piece unit composed of the mobile separation membrane and the mobile member are peeled off from the silicon wafer 35 as illustrated in Figure 14H. 20 (Mode of the Second Mode) Figures 15A and 15B are model diagrams of the cross section of the flow path direction illustrating the mode of the second embodiment of the liquid discharge head according to this invention; the figure 15A represents the state of the liquid discharge head during the absence of discharge of the liquid and FIG. 15B the state of the liquid discharge head during the presence of liquid discharge. In the present mode, the low voltage portions 28A and 28B are respectively placed on the front and back of the mobile separation membrane 28. Since the pressure generated by the formation of the bubbles extends the relaxed portions 28A and 28B, the The volume of bubbles 40 can be used effectively for the deformation of the mobile separation membrane. The discharge force of greater magnitude can be achieved with greater efficiency, therefore, because the movable member 26 moves more widely towards the first flow path 3 accordingly. The direction of the relaxed portions 28A and 28B does not impose specific restriction because the pressure generated as a result of the formation of the bubbles is only required to extend the low voltage parts 28A and 28B in the direction of the discharge port. The rest of the structure is identical to the structure that is included in the mode of the first mode. The mobile separation membrane 28 can acquire a high discharge efficiency by being adapted with these relaxed parts as already mentioned. The present example does not require that the membrane possess extension capacity. The mobile separation membrane 28 is formed with a uniform thickness by the same procedure as in the mode of the first embodiment described above. The mobile member 26 is manufactured by electrically cast nickel. The method of manufacturing by electric nickel casting comprises applying a resistance to a substrate of SUS in a thickness of 5 μm and then forming a pattern of the resistance deposited in the form of a row of continuous comb teeth in a manner that the assembly of a plurality of mobile adapter members is facilitated to correspond to the flow and continuous paths within the common liquid chambers. Then, the SUS substrate is electrically deposited with a layer of nickel, again 3 μm thick. The electroplated liquid used in this case is composed of nickel sulphomat [sic], a moderating agent (made by World Metal K. K. and marketed under the trade name of "Zeroall"), boric acid, unconservative (prepared by World Metal K. K. and marketed with the product code "NP-APS"), and nickel chloride. The application of an electric field in the electrodeposition is carried out by establishing a relevant electrode on the anode side, adjusting the SUS substrate in the form of a standard on the cathode side, maintaining the electrodeposition liquid at a temperature of 50 ° C and adjusting the current density at 5 A / cm2. After the SUS substrate has been electrodeposited as described above, the part of the nickel layer is removed by the exposure to an ultrasonic oscillation. As a result, the mobile member that one wishes to obtain is produced. In the meantime, a heater board having the electrothermal conversion elements superimposed on it is formed in a silicon chip by using the same installation as is normally used for a semiconductor. In the chip, the second flow path of bubbling liquid is formed in advance as with the dry film in the same manner in the mode of the first embodiment described above. The chip is separated into individual heater boards with a cutting machine. The heater board is attached to an aluminum base plate to which the printed substrate has been attached in advance and the printed substrate is connected to an aluminum wire to give rise to an electrical wiring. The proposed liquid discharge head is completed by gluing the mobile separation membrane 28 in the heater board in the resulting state, then aligning the movable member 26 manufactured by the above-described procedure to the heating element 2 and attaching them, then placing the grooved member in position and joining it to the other component parts already on the plate with the help of a retaining spring. Although the present mode has been represented using nickel in the movable member, this invention does not prevent the use of another material in its place. Only the mobile member is required to have the electricity necessary to produce a completely satisfactory operation. The materials that are preferred for use in the mobile members include metals such as silver, nickel, gold, iron, titanium, aluminum, platinum, tantalum, stainless steel and phosphor bronze which is very durable and alloys of these metals, resins such as acrylonitrile, butadiene having a nitrile group, resins such as polyamides having an amide group, resins such as polycarbonate having a carboxyl group, resins such as polyacetal having an aldehyde group, resins such as polysulfones having a sulfone group, other resins such as liquid crystal polymers and compounds of this, metals such as gold, tungsten, tantalum, nickel, stainless steel and titanium that offer high resistance to inks, alloys of these metals, materials coated with these metals or alloys for purposes of resistance to inks, resins, and polyamides having an amide group, resins such as polyacetals having an aldehyde group, resins such as polyether ether ketones which they have a ketone group, resins such as polyimides having an imide group, resins such as phenol resins having a hydroxyl group, resins such as polyethylene having ethyl, resins such as epoxy resins having an epoxy group, resins such as melamine resins having a amino group, resins such as xylene resins having a methylol group and compounds of these and ceramics such as silicon dioxide and compounds thereof, for example. Preferred materials used for mobile separation membranes include recently developed industrialized plastics such as, for example, polyethylene, polypropylene, polyamide, polyethylene terephthalate, melamine resins, phenolic resins, polybutadiene, polyurethane, polyether ether ketone, polyether sulfones, polyarylate, silicone rubber and polysulfones which are outstanding in their resistance to heat, resistance to solvents and their ability to be molded, which have elasticity and allow the manufacture of thin films, and the compounds of plastics as well as polyimides before mentioned. The thickness of the mobile separation membrane 25 can be decided by taking into account the material, the shape, etc., of the membrane from the point of view of achieving adequate strength for any partition wall and producing the actions of satisfactory expansion and contraction. In general, this thickness is preferred within the approximate range of 0.5-10 μm. Since this invention is constituted as described above, the following effects are manifested. In the present example, part of the effect of this invention is achieved even in the absence of elasticity because a low voltage gasket 28A is used in the relevant position. It should be mentioned that this invention, due to its principle, can be applied to the type of liquid discharge head that is provided with the discharge port in a position opposite to the surface of the heating element. Since the present invention is constructed as described above, it manifests the following effects. (1) The liquid can be discharged efficiently with the high discharge force through the discharge port. (2) The filling speed is raised and the discharge is achieved stably even in printing at a higher speed. (3) Even when the discharging liquid used is made of a material vulnerable to heat, the amount of deposit that is presented in the pile on the heating element can decrease and the freedom of selection of the discharging liquid can be extended. (4) The amount of satellites contained in the discharged liquid can be decreased and the image produced by the printing can improve in quality. (5) The quality of the image can be overcome by more uniformizing the meniscus in the shape and stabilizing the direction of the satellites.

Claims (75)

1. A method for discharging a liquid, comprising a step of effecting the discharge of a liquid by causing a moving separation membrane that is constantly maintained in a substantially separate state, a first flow path adapted to discharge a liquid and communicate with a discharge port and a second flow path provided with a bubble-forming zone to form bubbles in the liquid, be displaced with more bubbles on the downstream side than on the upstream side within the displacement range of the membrane. mobile separation, and discharge the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, whose method is characterized by incorporating the step of repressing the retraction of a liquid meniscus through the discharge port in the first flow path regulating the return velocity (VB) of the separation membrane vile on the upstream side to a level greater than the return speed (VB) of the mobile separation membrane on the downstream side by the use of a movable member adapted to move in accordance with the displacement range of the membrane moving separation during the return of the mobile separation membrane to the second flow path as a result of the contraction of the bubbles and provided on the side of the discharge port with a free end.
2. A method for discharging a liquid, comprising a step of effecting the discharge of a liquid by causing a moving separation membrane that is constantly maintained in a substantially separate state, a first flow path adapted to discharge a liquid and communicate with a discharge port and a second flow path provided with a bubble forming zone to form bubbles in the liquid, be displaced with more bubbles on the downstream side than on the upstream side within the displacement range of the mobile separation membrane, and discharging the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, which method is characterized by forming a substantially symmetric meniscus retraction distribution in relation to the central line of the discharge port regulating the return of the mobile separation membrane towards the a second flow path in consequence of the contraction of the bubbles by the use of a movable member adapted to move in accordance with the displacement range of the mobile separation membrane during the return of the mobile separation membrane to the second path of flow as a result of the contraction of the bubbles and provided on the side of the discharge port with a free end.
3. A method for discharging a liquid, comprising a step of effecting the discharge of a liquid by causing a moving separation membrane that is constantly maintained in a substantially separate state, a first flow path adapted to discharge a liquid and communicate with a discharge port and a second flow path provided with a bubble forming zone to form bubbles in the liquid, be displaced with more bubbles on the downstream side than on the upstream side within the displacement range of the mobile separation membrane, and discharge of the liquid through the discharge port by virtue of the displacement of the mobile separation membrane with the bubbles, which method is characterized by a substantially symmetrical distribution of the meniscus retraction in relation to the central line of the membrane. discharge port allowing the presence of at least part of the displacement area of the moving separation membrane in the initial state in a region substantially projected from the discharge port during the return of the mobile separation membrane to the second flow path as a result of the contraction of the bubbles.
4. A liquid discharge head comprising a first flow path adapted to discharge a liquid and communicate with a discharge port, a second flow path adapted with a bubble forming zone to form bubbles operating an energy generating element in a liquid, and a moving separation membrane to substantially separate the first flow path and the second flow path from each other and effecting the discharge of a liquid causing the displacement with the bubbles on the upstream side from the discharge port in relation to the flow of the liquid in the first flow path, whose liquid discharge head is characterized by being provided with a regulating device of the direction to regulate the direction of the mobile separation membrane during the displacement of the mobile separation membrane towards the second flow path consequently to the contraction of the bubbles.
5. The liquid discharge head according to claim 4, wherein the steering-regulating device is a mobile member adapted with a free end in the direction of the discharge port opposite the bubble-forming zone through the mobile separation membrane, and the movable member and the separation membrane mobile-1 are quickly joined together, in at least part of it.
The discharge head of the liquid according to claim 6, wherein the heating element for generating the heat necessary for bubble formation is adapted at a position in the bubble forming zone opposite the moving member.
The liquid discharge head according to claim 6, wherein the downstream portion of the bubbles generated in the bubble forming zone are bubbles formed on the downstream side of the center of the area of the heating element.
The liquid discharge head according to claim 6, wherein the movable member has the free end on the side of the discharge port from the center of the area of the heating element.
9. The liquid discharge head according to claim 5, wherein the movable member has a plate-like shape.
10. The liquid discharge head according to claim 5, wherein the mobile separation membrane is formed of resin.
The liquid discharge head, according to claim 5, further comprising a first common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the second flow path.
12. The liquid discharge head according to claim 5, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
The liquid discharge head according to claim 12, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble formation and thermal stability.
14. The liquid discharge head according to claim 5, wherein the front end portion of the movable separating membrane is positioned so that the position of the extension thereof is on top of the discharge port. and separated from a plate with holes in which the discharge port is formed.
15. The liquid discharge head according to claim 5, wherein the movable member is provided in the vicinity of the free end thereof with a limiting part of the lower displacement capable of allowing the movable member to have a greater amplitude than the amplitude of the flow path.
16. The liquid discharge head according to claim 5, wherein the mobile separation membrane is adapted to a relaxed or low-tension part.
17. ' The head of liquid discharge, according to claim 5, wherein the movable member is formed as a plate.
18. The liquid discharge head according to claim 6, wherein the movable member is formed as a plate.
19. The liquid discharge head according to claim 7, wherein the movable member is formed as a plate.
20. The liquid discharge head according to claim 6, wherein the mobile separation membrane is formed of resin.
21. The liquid discharge head according to claim 7, wherein the mobile separation membrane is formed of resin.
22. The liquid discharge head according to claim 8, wherein the mobile separation membrane is formed of resin.
23. The liquid discharge head according to claim 9, wherein the mobile separation membrane is formed of resin.
24. The liquid discharge head according to claim 6, which further comprises a common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the first flow path.
25. The liquid discharge head, according to claim 7, which further comprises a common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid that is going to be supplied to the first flow path.
26. The liquid discharge head according to claim 8, which further comprises a common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the first flow path.
27. The liquid discharge head according to claim 9, which further comprises a common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the first flow path.
28. The liquid discharge head according to claim 10, which further comprises a common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the first flow path.
29. The liquid discharge head according to claim 6, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
30. The liquid discharge head according to claim 7, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
31. The liquid discharge head according to claim 8, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
32. The liquid discharge head according to claim 9, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
33. The liquid discharge head according to claim 10, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
34. The liquid discharge head according to claim 11, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
35. The head of liquid discharge, according to claim 6, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the bottom of the discharge port and separated from a plate with holes in which the discharge port is formed.
36. The liquid discharge head according to claim 7, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
37. The liquid discharge head according to claim 8, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
38. The liquid discharge head according to claim 9, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the discharge port and separated from a plate with holes in which the discharge port is formed.
39. The liquid discharge head according to claim 10, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
40. The liquid discharge head according to claim 11, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
41. The liquid discharge head according to claim 6, wherein the front end portion of the mobile separation membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
42. The liquid discharge head according to claim 12, wherein the front end portion of the movable separating membrane is positioned so that the position of the extension thereof is on the lower part of the port of separation. discharge and separated from a plate with holes in which the discharge port is formed.
43. The liquid discharge head according to claim 6, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
44. The liquid discharge head according to claim 7, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
45. The liquid discharge head according to claim 8, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
46. The liquid discharge head according to claim 9, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
47. The liquid discharge head according to claim 10, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
48. The liquid discharge head according to claim 11, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
49. The liquid discharge head according to claim 12, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
50. The head of discharge of liquid, according to claim 13, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the movable member to have an amplitude greater than the amplitude of the flow path.
51. The liquid discharge head according to claim 14, wherein the movable member is provided, in the vicinity of the free end thereof, with a portion limiting the lower displacement, capable of allowing the mobile member to have an amplitude greater than the amplitude of the flow path.
52. The liquid discharge head according to claim 6, wherein the mobile separation membrane is adapted with a low voltage part.
53. The liquid discharge head according to claim 7, wherein the mobile separation membrane is adapted with a low voltage part.
54. The liquid discharge head according to claim 8, wherein the mobile separation membrane is adapted to a low voltage part.
55. The liquid discharge head according to claim 9, wherein the mobile separation membrane is adapted with a low voltage part.
56. The liquid discharge head according to claim 10, wherein the mobile separation membrane is adapted to a low voltage part.
57. The liquid discharge head according to claim 11, wherein the mobile separation membrane is adapted with a low voltage part.
58. The liquid discharge head according to claim 12, wherein the mobile separation membrane is adapted with a low voltage part.
59. The liquid discharge head according to claim 13, wherein the mobile separation membrane is adapted with a low voltage part.
60. The liquid discharge head according to claim 14, wherein the mobile separation membrane is adapted to a low voltage part.
61. The liquid discharge head according to claim 15, wherein the mobile separation membrane is adapted with a low voltage part.
62. The liquid discharge head according to claim 7, wherein the movable member has the free end positioned on the side of the discharge port from the center of the heater element area.
63. The liquid discharge head, according to claim 62, wherein the movable member is formed as a plate.
64. The liquid discharge head according to claim 62, wherein the mobile separation membrane is formed of resin.
65. The liquid discharge head according to claim 6.2, further comprising a first common liquid chamber for storing a liquid to be delivered to the first flow path and a second common liquid chamber for storing a liquid. liquid that is going to be supplied to the second flow path.
66. The liquid discharge head according to claim 62, wherein the liquid to be delivered to the first flow path and the liquid to be delivered to the second flow path are different liquids.
67. The liquid discharge head according to claim 62, wherein the front end portion of the movable separating membrane is positioned so that the position of the extension thereof is on top of the discharge port. and separated from a plate with holes in which the discharge port is formed.
68. The liquid discharge head according to claim 62, wherein the movable member is provided in the vicinity of the free end thereof with a limiting part of the lower displacement capable of allowing the movable member to have a greater amplitude than the amplitude of the flow path.
69. The liquid discharge head, according to claim 62, wherein the mobile separation membrane is adapted with a relaxed part or with low tension.
70. The liquid discharge head, according to claim 29, wherein the liquid to be delivered to the second flow path is greater, to the liquid to be supplied to the first flow path in at least one of the qualities, low viscosity, property of bubble ftion and thermal stability.
71. The liquid discharge head according to claim 30, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble ftion and thermal stability.
72. The liquid discharge head according to claim 31, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble ftion and thermal stability.
73. The liquid discharge head according to claim 32, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble ftion and thermal stability.
74. The liquid discharge head according to claim 33, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble ftion and thermal stability.
75. The liquid discharge head according to claim 34, wherein the liquid to be delivered to the second flow path is greater than the liquid to be delivered to the first flow path in less one of the qualities, low viscosity, property of bubble ftion and thermal stability. 0
MXPA/A/1998/004377A 1997-06-06 1998-06-02 Method for the discharge of liquid and head to download liquid MXPA98004377A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9-149383 1997-06-06

Publications (1)

Publication Number Publication Date
MXPA98004377A true MXPA98004377A (en) 1999-12-10

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