Piezoelectric ceramic driver and ink-jet printing head

Abstract

The piezoelectric ceramic driver provided by the utility model comprises a piezoelectric ceramic assembly, a nozzle film with a nozzle hole and a controller, the piezoelectric ceramic assembly comprises a piezoelectric ceramic body and a piezoelectric ceramic cover plate; the piezoelectric ceramic body is provided with a groove, first electrodes are plated on two inner side surfaces of the groove, and a second electrode is plated on a first end surface of the piezoelectric ceramic body; the piezoelectric ceramic cover plate covers the groove so as to form a channel for liquid from the liquid supply system to flow through with the piezoelectric ceramic body; the nozzle film covers the first end surface in a manner that the nozzle hole is communicated with the channel so as to cover the channel and expose the second electrode; the second electrode is connected with the controller through a conductive wire; and the controller is used for providing electric energy for the piezoelectric ceramic assembly, so that the piezoelectric ceramic assembly deforms under the action of the electric energy, the liquid in the channel is extruded, and the liquid flows out of the channel through the nozzle hole. According to the piezoelectric ceramic driver and the ink-jet printing head provided by the invention, liquid driving is realized.

Description

Technical Field

[0001] The present application relates to the field of inkjet printing technology, and in particular to a piezoelectric ceramic driver and an inkjet print head. Background Art

[0002] Thanks to the improvement of scientific theories, the demand for technological applications and the progress of materials science, piezoelectric ceramics have been widely used and continuously innovated in various fields.

[0003] Piezoelectric ceramics have piezoelectric effect and are information functional ceramic materials that can convert mechanical energy and electrical energy into each other. When an external electric field is applied to a piezoelectric dielectric, the piezoelectric ceramic will deform. When an external electric field equal to the spontaneous polarization of the piezoelectric ceramic is applied, the polarization strength is enhanced, and the increase in polarization strength causes the piezoelectric ceramic to stretch along the polarization direction. On the contrary, if a reverse electric field is applied, the piezoelectric ceramic will shorten along the polarization direction. Therefore, how to use piezoelectric ceramics to drive liquids has become a problem that needs to be solved urgently. Utility Model Content

[0004] In view of this, the present application provides a piezoelectric ceramic driver and an inkjet print head to achieve driving of liquid.

[0005] Specifically, the present application is implemented through the following technical solutions:

[0006] In a first aspect, the present application provides a piezoelectric ceramic driver, the piezoelectric ceramic driver comprising a piezoelectric ceramic component, a nozzle membrane having a nozzle hole, and a controller; wherein,

[0007] The piezoelectric ceramic component comprises a piezoelectric ceramic body and a piezoelectric ceramic cover plate; wherein the piezoelectric ceramic body has a groove, two inner side surfaces of the groove are plated with a first electrode, and a first end surface of the piezoelectric ceramic body is plated with a second electrode; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body that are perpendicular to the inner side surface of the groove;

[0008] The piezoelectric ceramic cover plate is arranged on the groove to form a channel with the piezoelectric ceramic body for liquid from the liquid supply system to flow through;

[0009] The nozzle film is covered on the first end surface in a manner that the nozzle hole is connected to the channel, so as to cover the channel and expose the second electrode;

[0010] The second electrode is connected to the controller via a conductive wire; the controller is used to provide electrical energy to the piezoelectric ceramic component so that the piezoelectric ceramic component deforms under the action of the electrical energy and squeezes the liquid in the channel so that the liquid flows out of the channel through the nozzle hole.

[0011] Optionally, the bottom surface of the groove is also plated with an electrode.

[0012] Optionally, a surface of the piezoelectric ceramic cover plate facing the groove is further plated with an electrode.

[0013] Optionally, the cross-section of the groove on the first end surface is rectangular, triangular or U-shaped.

[0014] Optionally, the nozzle membrane is a nozzle membrane made of polyamide.

[0015] Optionally, the thickness of the nozzle membrane along the outflow direction of the liquid is equal to a specified value, and the diameter of the nozzle hole gradually decreases along the outflow direction of the liquid.

[0016] The second aspect of the present application provides a film jet print head, the ink jet print head comprising any one of the piezoelectric ceramic drivers and a liquid supply system provided in the first aspect of the present application, wherein:

[0017] The liquid supply system is connected to the piezoelectric ceramic body and is used to provide ink for the inkjet print head;

[0018] The piezoelectric ceramic driver is used to realize ink ejection by utilizing deformation.

[0019] The piezoelectric ceramic driver provided by the present application is provided with a piezoelectric ceramic component, a nozzle membrane with a nozzle hole and a controller, so that the piezoelectric ceramic component includes a piezoelectric ceramic body and a piezoelectric ceramic cover plate; the piezoelectric ceramic body has a groove, and the first electrode is plated on the two inner side surfaces of the groove, and the second electrode is plated on the first end surface of the piezoelectric ceramic body; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body that are perpendicular to the inner side surface of the groove; the piezoelectric ceramic cover plate is covered on the groove to form a channel for liquid from a liquid supply system to flow through with the piezoelectric ceramic body; the nozzle membrane is covered on the first end surface in a manner that the nozzle hole is connected to the channel to cover the channel and expose the second electrode; the second electrode is connected to the controller through a conductive wire, and the controller provides electrical energy to the piezoelectric ceramic component, so that the piezoelectric ceramic component is deformed and squeezes the liquid in the channel under the action of the electrical energy, so that the liquid flows out of the channel through the nozzle hole. In this way, by providing electric energy to the piezoelectric ceramic component, the piezoelectric ceramic component can be deformed under the action of electric energy to squeeze the liquid in the channel out, thereby driving the liquid, that is, realizing the ejection of ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a first embodiment of a piezoelectric ceramic driver provided in the present application;

[0021] Figure 2 The appearance diagram of the piezoelectric ceramic driver provided for this application;

[0022] Figure 3 A side view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of a piezoelectric ceramic body according to an exemplary embodiment of the present application;

[0024] Figure 5 A top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application;

[0025] Figure 6 A top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application;

[0026] Figure 7 A top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application;

[0027] Figure 8 A top view of a piezoelectric ceramic driver according to another exemplary embodiment of the present application;

[0028] Fig. 9 A top view of a piezoelectric ceramic driver according to another exemplary embodiment of the present application;

[0029] Description of reference numerals:

[0030] 1: Piezoelectric ceramic components;

[0031] 11: Piezoelectric ceramic body;

[0032] 12: Piezoelectric ceramic cover;

[0033] 111: groove;

[0034] 2: Nozzle membrane;

[0035] 21: nozzle hole;

[0036] 3: first electrode;

[0037] 4: second electrode;

[0038] 5: Conductive thread. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0040] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0041] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0042] The present application provides a piezoelectric ceramic driver and an inkjet print head for driving liquid.

[0043] The piezoelectric ceramic driver provided by the present application is provided with a piezoelectric ceramic component, a nozzle membrane with a nozzle hole and a controller, so that the piezoelectric ceramic component includes a piezoelectric ceramic body and a piezoelectric ceramic cover plate; the piezoelectric ceramic body has a groove, and the first electrode is plated on the two inner side surfaces of the groove, and the second electrode is plated on the first end surface of the piezoelectric ceramic body; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body that are perpendicular to the inner side surface of the groove; the piezoelectric ceramic cover plate is covered on the groove to form a channel for liquid from a liquid supply system to flow through with the piezoelectric ceramic body; the nozzle membrane is covered on the first end surface in a manner that the nozzle hole is connected to the channel to cover the channel and expose the second electrode; the second electrode is connected to the controller through a conductive wire, and the controller provides electrical energy to the piezoelectric ceramic component, so that the piezoelectric ceramic component is deformed and squeezes the liquid in the channel under the action of the electrical energy, so that the liquid flows out of the channel through the nozzle hole. In this way, by providing electric energy to the piezoelectric ceramic component, the piezoelectric ceramic component can be deformed under the action of electric energy to squeeze the liquid in the channel out, thereby driving the liquid, that is, realizing the ejection of ink.

[0044] Specific embodiments are given below to introduce the technical solution of the present application in detail.

[0045] Figure 1 This is a schematic diagram of a first embodiment of a piezoelectric ceramic driver provided in this application. Figure 2 The appearance diagram of the piezoelectric ceramic driver provided in this application is as follows: Figure 3 A side view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application is shown. Figure 4 This is a schematic diagram of the structure of a piezoelectric ceramic body shown in an exemplary embodiment of the present application. Figures 1 to 4 The piezoelectric ceramic driver provided in this embodiment includes a piezoelectric ceramic component 1, a nozzle membrane 2 having a nozzle hole 21, and a controller (not shown in the figure); wherein,

[0046] The piezoelectric ceramic component 1 includes a piezoelectric ceramic body 11 and a piezoelectric ceramic cover plate 12; wherein the piezoelectric ceramic body 11 has a groove 111, and the first electrodes 3 are plated on the two inner side surfaces of the groove 111, and the second electrode 4 is plated on the first end surface of the piezoelectric ceramic body 11; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body 11 that are perpendicular to the inner side surface of the groove 111;

[0047] The piezoelectric ceramic cover plate 12 is covered on the groove 111 to form a channel with the piezoelectric ceramic body 11 for the liquid from the liquid supply system to flow through;

[0048] The nozzle membrane 2 is covered on the first end surface in a manner that the nozzle hole 21 is connected to the channel, so as to cover the channel and expose the second electrode 4;

[0049] The second electrode 4 is connected to the controller via a conductive wire 5; the controller is used to provide electrical energy to the piezoelectric ceramic component 1, so that the piezoelectric ceramic component 1 is deformed and squeezes the liquid in the channel under the action of the electrical energy, so that the liquid flows out of the channel through the nozzle hole 21.

[0050] For details, please continue to refer to Figure 1 and Figure 4 The piezoelectric ceramic body 11 may be a U-shaped structure having a groove 111 , and the first electrodes 3 are plated on the two inner side surfaces of the groove 111 , and the second electrode 4 is plated on the first end surface of the piezoelectric ceramic body 11 .

[0051] It should be noted that, refer to Figure 4 The first end face refers to any one of the two end faces of the piezoelectric ceramic body 11 that are perpendicular to the inner side of the groove 111; in other words, Figure 4 In the example shown, the first end surface refers to any one of the two end surfaces of the piezoelectric ceramic body 11 along the length direction. Figure 4 The first electrode 3 is electrically connected to the second electrode 4 to achieve the transmission of electrical signals.

[0052] For further information, see Figures 1 to 3 The piezoelectric ceramic cover plate 12 is a rectangular plate-shaped object, which is covered on the groove 111 and forms a channel for the liquid from the liquid supply system to flow through with the piezoelectric ceramic body 11. Figure 1 and Figure 3 That is, after the piezoelectric ceramic cover plate 12 is covered on the piezoelectric ceramic body 11, it and the piezoelectric ceramic body 11 are surrounded to form a rectangular parallelepiped, and there is a channel inside the rectangular parallelepiped. The first electrodes 3 are plated on the two inner side surfaces of the channel along the length direction.

[0053] In a specific implementation, the piezoelectric ceramic cover plate 12 and the piezoelectric ceramic body 11 may be bonded together to form a channel.

[0054] It should be noted that the liquid supply system is used to provide liquid to the piezoelectric ceramic driver, and is specifically connected to one end surface of the channel. Figures 1 to 4 In the example shown, one end of the channel is covered with a nozzle membrane 2 and the other end of the channel is connected to a liquid supply system.

[0055] For details, please continue to refer to Figure 2 and Figure 3The nozzle membrane 2 is covered on the first end surface in a manner that the nozzle hole 21 is connected to the channel, so as to cover the channel and expose the second electrode 4.

[0056] It should be noted that see Figure 2 The edge of one side of the nozzle membrane 2 close to the piezoelectric ceramic cover plate 12 covers the piezoelectric ceramic cover plate 12, and the edge of the other side of the nozzle membrane 2 away from the piezoelectric ceramic cover plate 12 has a preset distance from the bottom edge of the groove 111 away from the piezoelectric ceramic cover plate 12 to cover the channel and expose the second electrode 4.

[0057] The specific value of the preset distance is set according to actual needs and is not limited in this embodiment.

[0058] Specifically, the specific shape of the nozzle membrane 2 matches the first end surface, for example, Figure 2 In the example shown, the nozzle membrane 2 may be a rectangular thin plate.

[0059] Furthermore, the nozzle membrane 2 has a nozzle hole 21. When the nozzle membrane 2 is covered on the first end surface, the nozzle membrane 2 is connected to the channel. It should be noted that the specific shape and number of the nozzle hole 21 are set according to actual needs, and are not limited in this embodiment. For example, in a possible implementation, the number of the nozzle hole 21 can be one or more. For another example, in a possible implementation, the nozzle hole 21 can be circular.

[0060] Furthermore, the second electrode 4 is connected to the controller via a conductive wire 5. In specific implementation, the second electrode 4 can be connected to one end of the conductive wire 5 by using a conductive adhesive, and then the other end of the conductive wire 5 is connected to the controller. The conductive wire 5 can be a copper wire or a conductive wire made of other conductive alloys, and is not limited in this embodiment.

[0061] The following is a brief introduction to the working principle of the piezoelectric ceramic driver provided in this application:

[0062] Please also refer to Figures 1 to 4 In a specific implementation, when it is necessary to drive the liquid, the controller can provide electrical energy to the piezoelectric ceramic component 1 through the conductive wire 5, the second electrode 4, and the first electrode 3. Accordingly, the piezoelectric ceramic component 1 is deformed under the action of the electrical energy. Further, after the piezoelectric ceramic component 1 is deformed, it will squeeze the liquid in the channel, so that the liquid flows out of the channel through the nozzle hole 21. In this way, the liquid can be driven.

[0063] The piezoelectric ceramic driver provided in this embodiment is provided with a piezoelectric ceramic component, a nozzle membrane with a nozzle hole and a controller, so that the piezoelectric ceramic component includes a piezoelectric ceramic body and a piezoelectric ceramic cover plate; the piezoelectric ceramic body has a groove, the two inner side surfaces of the groove are plated with a first electrode, and the first end surface of the piezoelectric ceramic body is plated with a second electrode; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body that are perpendicular to the inner side surface of the groove; the piezoelectric ceramic cover plate is covered on the groove to form a channel for liquid from a liquid supply system to flow through with the piezoelectric ceramic body; the nozzle membrane is covered on the first end surface in a manner that the nozzle hole is connected to the channel to cover the channel and expose the second electrode; the second electrode is connected to the controller through a conductive wire, and the controller provides electrical energy to the piezoelectric ceramic component, so that the piezoelectric ceramic component is deformed and squeezes the liquid in the channel under the action of the electrical energy, so that the liquid flows out of the channel through the nozzle hole. In this way, by providing electric energy to the piezoelectric ceramic component, the piezoelectric ceramic component can be deformed under the action of electric energy to squeeze the liquid in the channel out, thereby driving the liquid, that is, realizing the ejection of ink.

[0064] Specifically, Figure 5 This is a top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application. Figure 5 ,exist Figure 5 In the example shown, the first electrodes 3 are plated on two inner side surfaces of the groove 111 .

[0065] Please refer to Figure 5 By plating the first electrode 3 on the two inner side surfaces of the groove 111, the liquid in the channel can be squeezed in the two directions indicated by the arrows under the action of electric energy, so that the liquid flows out of the channel, thereby achieving the purpose of liquid driving.

[0066] Specifically, Figure 6 This is a top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application. Figure 6 ,exist Figure 6 In the example shown, the bottom surface of the groove 111 is also plated with an electrode.

[0067] Please refer to Figure 6 By plating electrodes on the two inner side surfaces and the bottom surface of the groove 111, the liquid in the channel can be squeezed in the three directions indicated by the arrows under the action of electric energy so that the liquid flows out of the channel, thereby achieving the purpose of liquid driving.

[0068] Specifically, Figure 7 This is a top view of a piezoelectric ceramic driver according to an exemplary embodiment of the present application. Figure 7 ,exist Figure 7In the example shown, a surface of the piezoelectric ceramic cover plate 12 facing the groove 111 is further plated with an electrode.

[0069] Please refer to Figure 7 By plating electrodes on the two inner side surfaces, the bottom surface, and the side of the piezoelectric ceramic cover plate 12 facing the groove 111, the liquid in the channel can be squeezed in the four directions indicated by the arrows under the action of electric energy to make the liquid flow out of the channel, thereby achieving the purpose of liquid driving.

[0070] For details, please continue to refer to Figures 5 to 7 , the cross section of the groove 111 on the first end surface is rectangular. Further, Figure 8 FIG. 1 is a top view of a piezoelectric ceramic driver according to another exemplary embodiment of the present application. Fig. 9 This is a top view of a piezoelectric ceramic driver shown in another exemplary embodiment of the present application. Please also refer to Figure 8 and Fig. 9 The cross-section of the groove 111 on the first end surface can be triangular or U-shaped.

[0071] Please also refer to Figures 7 to 9 In the piezoelectric ceramic driver provided in the present application, the cross-section of the groove 111 on the first end surface is rectangular, triangular or U-shaped, which is not limited in the present embodiment.

[0072] In addition, please continue to refer to Figure 7 When the cross-section of the groove 111 on the first end face is rectangular, electrodes can be arranged on the two inner side surfaces of the rectangular groove to achieve the purpose of liquid driving by extrusion in two directions, or the first electrode 3 can be arranged on the two inner side surfaces or the bottom surface of the rectangular groove to achieve the purpose of liquid driving by extrusion in three directions, or electrodes can be arranged on the two side surfaces, the bottom surface of the rectangular groove and the side of the piezoelectric ceramic cover plate 12 facing the groove 111 to achieve the purpose of liquid driving by extrusion in four directions.

[0073] Similarly, when the interface of the groove 111 on the first end face is a triangle, the first electrode 3 can be set on the two inner side surfaces of the triangular groove to achieve the purpose of liquid driving by extrusion in two directions, or electrodes can be set on the two inner side surfaces of the triangular groove and on the side of the piezoelectric ceramic cover plate 12 facing the groove 111 to achieve the purpose of liquid driving by extrusion in three directions.

[0074] Similarly, when the interface of the groove 111 on the first end face is U-shaped, electrodes can be set on the two inner side surfaces of the U-shaped groove to achieve the purpose of liquid driving by extrusion in two directions, or electrodes can be set on the two inner side surfaces and the bottom surface of the U-shaped groove to achieve the purpose of liquid driving by extrusion in three directions, or electrodes can be set on the two side surfaces, the bottom surface of the U-shaped groove and the side of the piezoelectric ceramic cover plate 12 facing the groove 111 to achieve the purpose of liquid driving by extrusion in four directions.

[0075] Optionally, in a possible implementation of the present application, the nozzle membrane 2 is a nozzle membrane made of polyamide.

[0076] In addition, in a possible implementation of the present application, the thickness of the nozzle membrane 2 along the outflow direction of the liquid is equal to a specified value, and the diameter of the nozzle hole 21 gradually decreases along the outflow direction of the liquid.

[0077] Specifically, the designated value is set according to actual needs, and in this embodiment, the designated value is not limited. In other words, the nozzle membrane 2 is a plate-like object with a certain thickness, and in addition, with the liquid outflow direction as the outside, the nozzle hole 21 can be a hole that is larger inside and smaller outside.

[0078] It should be noted that the diameter of the nozzle hole 21 is designed to have a gradual effect, and the diameter of the nozzle hole 21 gradually becomes smaller according to the outflow direction of the liquid to meet specific usage requirements.

[0079] The method provided in the present application helps to improve the uniformity of flow rate, prevent blockage and optimize fluid distribution by designing the diameter of the nozzle hole to have a gradual effect.

[0080] The present application also provides an inkjet print head. The inkjet print head provided by the present application comprises any one of the piezoelectric ceramic drivers and liquid supply system provided in the first aspect of the present application, wherein:

[0081] The liquid supply system is connected to the piezoelectric ceramic body and is used to provide ink for the inkjet print head;

[0082] The piezoelectric ceramic driver is used to realize ink ejection by utilizing deformation.

[0083] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A piezoelectric ceramic driver, characterized in that: The piezoelectric ceramic driver comprises a piezoelectric ceramic component, a nozzle membrane having a nozzle hole and a controller; wherein, The piezoelectric ceramic component comprises a piezoelectric ceramic body and a piezoelectric ceramic cover plate; wherein the piezoelectric ceramic body has a groove, two inner side surfaces of the groove are plated with a first electrode, and a first end surface of the piezoelectric ceramic body is plated with a second electrode; the first end surface is any one of the two end surfaces of the piezoelectric ceramic body that are perpendicular to the inner side surface of the groove; The piezoelectric ceramic cover plate is arranged on the groove to form a channel with the piezoelectric ceramic body for liquid from the liquid supply system to flow through; The nozzle film is covered on the first end surface in a manner that the nozzle hole is connected to the channel, so as to cover the channel and expose the second electrode; The second electrode is connected to the controller via a conductive wire; the controller is used to provide electrical energy to the piezoelectric ceramic component so that the piezoelectric ceramic component deforms under the action of the electrical energy and squeezes the liquid in the channel so that the liquid flows out of the channel through the nozzle hole.

2. The piezoelectric ceramic driver according to claim 1, characterized in that: The bottom surface of the groove is also plated with an electrode.

3. The piezoelectric ceramic driver according to claim 1 or 2, characterized in that: The piezoelectric ceramic cover plate is further plated with an electrode on one side facing the groove.

4. The piezoelectric ceramic driver according to claim 1, characterized in that: The cross section of the groove on the first end surface is rectangular, triangular or U-shaped.

5. The piezoelectric ceramic driver according to claim 1, characterized in that: The nozzle membrane is a nozzle membrane made of polyamide.

6. The piezoelectric ceramic driver according to claim 1 or 5, characterized in that: The thickness of the nozzle film along the outflow direction of the liquid is equal to a specified value, and the diameter of the nozzle hole gradually decreases along the outflow direction of the liquid.

7. An inkjet print head, characterized in that: The piezoelectric ceramic driver and liquid supply system comprised of any one of claims 1 to 6, wherein: The liquid supply system is connected to the piezoelectric ceramic body and is used to provide ink for the inkjet print head; The piezoelectric ceramic driver is used to realize ink ejection by utilizing deformation.

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