Patent application number | Description | Published |
20080241362 | METHOD OF MANUFACTURING PIEZOELECTRIC ELEMENT AND METHOD OF MANUFACTURING LIQUID EJECTION HEAD - The method of manufacturing a piezoelectric element includes: a lower electrode forming step of forming a lower electrode on a surface of a substrate; a piezoelectric film deposition step of depositing a piezoelectric film made of a piezoelectric material by one of epitaxial growth and oriented growth onto a surface of the lower electrode reverse to a surface adjacent to the substrate; an upper electrode forming step of forming an upper electrode onto a surface of the piezoelectric film reverse to a surface adjacent to the lower electrode; and a polarization direction reversal step of reversing a polarization direction of the piezoelectric film by maintaining, after the upper electrode forming step, a state for a prescribed duration where a temperature of the piezoelectric film is set to a first temperature while application of an electric field to the piezoelectric film in a direction from the upper electrode toward the lower electrode is performed, then keeping the application of the electric field while lowering the temperature of the piezoelectric film to a second temperature lower than the first temperature, and then stopping the application of the electric field. | 10-02-2008 |
20080241363 | METHOD OF MANUFACTURING PIEZOELECTRIC ELEMENT AND METHOD OF MANUFACTURING LIQUID EJECTION HEAD - The method of manufacturing a piezoelectric element includes the steps of: a lower electrode forming step of forming a lower electrode on a surface of a substrate; a piezoelectric film deposition step of depositing a piezoelectric film made of a piezoelectric material by one of epitaxial growth and oriented growth onto a surface of the lower electrode reverse to a surface adjacent to the substrate; an upper electrode forming step of forming an upper electrode onto a surface of the piezoelectric film reverse to a surface adjacent to the lower electrode; and a polarization direction reversal step of reversing a polarization direction of the piezoelectric film by applying an alternating electric field of an intensity not lower than a coercive electric field of the piezoelectric material, between the upper electrode and the lower electrode, and then applying a direct electric field of an intensity not lower than the coercive electric field in a direction from the upper electrode toward the lower electrode. | 10-02-2008 |
20090115821 | METHOD OF DRIVING PIEZOELECTRIC ACTUATOR AND LIQUID EJECTION APPARATUS - A method of driving a piezoelectric actuator which is constituted of a lower electrode film, a piezoelectric film and an upper electrode film that are layered successively onto a diaphragm, includes the step of: applying an electric field to the piezoelectric film in a direction opposite to the orientation direction of the piezoelectric film while continuously changing an intensity of the electric field from a first electric field intensity to a second electric field intensity, the first electric field intensity being smaller than a coercive electric field of the piezoelectric film, the second electric field intensity being larger than the coercive electric field of the piezoelectric film. The piezoelectric film is oriented in the orientation direction from the lower electrode film toward the upper electrode film. | 05-07-2009 |
20090231395 | METHOD OF DRIVING PIEZOELECTRIC ACTUATOR AND METHOD OF DRIVING LIQUID EJECTION HEAD - A method of driving a piezoelectric actuator has the step of driving a piezoelectric actuator including a diaphragm, a lower electrode formed on one surface of the diaphragm, a piezoelectric film formed in epitaxial growth or oriented growth on an opposite side of the lower electrode to the diaphragm so as to be preferentially oriented in a (111) direction, and an upper electrode formed on an opposite side of the piezoelectric film to the lower electrode, by application of an electric field in a direction opposite to a direction of polarization of the piezoelectric film. | 09-17-2009 |
20090236949 | PROCESS FOR PRODUCING A PIEZOELECTRIC FILM, FILM FORMING APPARATUS, AND PIEZOELECTRIC FILM - A piezoelectric film is formed on a substrate by a sputtering technique at a film formation temperature higher than a Curie temperature. An electric field is formed across the piezoelectric film in a direction heading from a surface side of the piezoelectric film toward the substrate side before a temperature of the piezoelectric film having been formed falls to a temperature lower than the Curie temperature, polarization processing being caused to begin by the formation of the electric field across the piezoelectric film. The temperature of the piezoelectric film is allowed to fall to a temperature lower than the Curie temperature in the state in which the electric field is being formed. | 09-24-2009 |
20110050769 | METHOD AND APPARATUS FOR DRIVING INKJET HEAD - A method for driving an inkjet head includes the step of applying drive signals including an ejection signal used for ejecting ink and a non-ejection signal used for not ejecting the ink, to an actuator provided with a pressure chamber at a constant cycle so as to increase or reduce pressure in the pressure chamber in such a manner that the ink is ejected or not ejected from a nozzle connected with the pressure chamber, wherein: a waveform of the ejection signal includes a combination of an ejection pulse for causing a droplet of the ink to be ejected from the nozzle and a non-ejection pulse for not causing a droplet of the ink to be ejected from the nozzle, the ejection pulse of the waveform of the ejection signal includes a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, the non-ejection pulse of the waveform of the ejection signal includes a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, the part for reducing the pressure in the pressure chamber of the non-ejection pulse of the waveform of the ejection signal is set to reduce the pressure in the pressure chamber while a tail of a droplet of the ink ejected from the nozzle by the ejection pulse is connected to the nozzle, the part for increasing the pressure in the pressure chamber of the non-ejection pulse of the waveform of the ejection signal is set to increase the pressure in the pressure chamber within a resonance period of the pressure chamber from a moment when the pressure in the pressure chamber is increased by the ejection pulse, and the non-ejection signal has a waveform including only a non-ejection pulse including a part for reducing the pressure in the pressure chamber and a part for increasing the reduced pressure in the pressure chamber, not to cause a droplet of the ink to be ejected from the nozzle. | 03-03-2011 |
20110175956 | INKJET EJECTION APPARATUS, INKJET EJECTION METHOD, AND INKJET RECORDING APPARATUS - A standard drive waveform contains, in one ejection cycle: a first ejection waveform group including at least one ejection waveform causing liquid to be ejected from a nozzle to form one dot of a maximum size; a first non-ejection waveform arranged after the first ejection waveform group; a second ejection waveform group including at least one ejection waveform causing the liquid to be ejected from the nozzle to form a dot of a minimum size; and a second non-ejection waveform arranged after the second ejection waveform group. At least one of the ejection waveforms is selected from one of the first and second ejection waveform groups in accordance with ejection data. When the selected ejection waveform belongs to the first ejection waveform group, the first non-ejection waveform is further selected. When the selected ejection waveform belongs to the second ejection waveform group, the second non-ejection waveform is further selected. | 07-21-2011 |
Patent application number | Description | Published |
20080225089 | PIEZOELECTRIC ACTUATOR, LIQUID EJECTION HEAD, IMAGE FORMING APPARATUS, AND METHOD OF MANUFACTURING PIEZOELECTRIC ACTUATOR - The piezoelectric actuator has: a diaphragm made of silicon; an insulating layer formed on a front surface of the diaphragm; a plurality of individual electrodes formed on a surface of the insulating layer; a plurality of piezoelectric bodies formed respectively on surfaces of the plurality of individual electrodes; and a plurality of common electrodes which are respectively arranged across the plurality of piezoelectric bodies from the plurality of individual electrodes, wherein the plurality of piezoelectric bodies are polarized in a direction from the individual electrodes toward the plurality of common electrodes. | 09-18-2008 |
20100079554 | METHOD OF MANUFACTURING PIEZOELECTRIC ACTUATOR, LIQUID EJECTION HEAD, AND IMAGE FORMING APPARATUS - A method of manufacturing a piezoelectric actuator which includes a piezoelectric device constituted of a lower electrode, a piezoelectric body and an upper electrode arranged on a diaphragm, the method includes: a polishing step of polishing the piezoelectric body; and a first heating step of heating the piezoelectric body to a temperature which is not lower than a Curie point of the piezoelectric body and performing re-polarization of the piezoelectric body having been polished in the polishing step. | 04-01-2010 |
20100238216 | Piezoelectric Actuator, Method Of Manufacturing Piezoelectric Actuator, Liquid Ejection Head, Method Of Manufacturing Liquid Ejection Head And Image Forming Apparatus - A piezoelectric actuator includes: a piezoelectric layer formed by a film formation method so as to have orientation in a prescribed orientation direction; and a pair of electrodes, disposed on a same surface which is substantially perpendicular to the orientation direction of the piezoelectric layer, for applying to the piezoelectric layer an electric field in a direction substantially perpendicular to the orientation direction. | 09-23-2010 |
Patent application number | Description | Published |
20130083106 | DEVICE AND METHOD FOR DRIVING LIQUID DISCHARGE HEAD, LIQUID DISCHARGE APPARATUS, AND INK-JET APPARATUS - A basic driving waveform which includes a plurality of jet pulses and a non-jet pulse just before the last jet pulse in one recording period is generated. A part of the pulses is removed from the basic driving waveform by maintaining at least the last jet pulse, and a driving signal that is applied to a discharge energy generation element is generated. In the case of using only the last jet pulse among the plurality of jet pulses is used for the jet, a first driving signal that includes the non-jet pulse just before the last jet pulse is generated. In the case of joining the last jet pulse and at least another jet pulse among the plurality of jet pulses to use the pulses for the jet, a second driving signal that is configured to remove the non-jet pulse is generated. | 04-04-2013 |
20140300670 | INK CIRCULATION APPARATUS, INK CIRCULATION METHOD AND INKJET RECORDING APPARATUS - An object of the invention is to prevent, both bubbles and particles from being generated, when circulating ink in an inkjet head. The object can be achieved by an ink circulation apparatus, including: an ink tank that accumulates radical polymerization-type UV-curing ink so as to be in contact with gas including at least oxygen; an inkjet head; oxygen removing means that removes oxygen from the radical polymerization-type UV-curing ink; and control means that changes a mode between a first mode of removing oxygen from the radical polymerization-type UV-curing ink by the oxygen removing means and a second mode of not removing oxygen from the radical polymerization-type UV-curing ink and changes a mode from the first mode to the second mode before electric power of the apparatus is cut off. | 10-09-2014 |
20140300672 | INK CIRCULATION APPARATUS, INK CIRCULATION METHOD AND INKJET RECORDING APPARATUS - An ink circulation apparatus, including: an ink tank that accumulates radical polymerization-type UV-curing ink; a supplying flow path that communicates with the ink tank and a supply port of an inkjet head; a supply pump that supplies the ink accumulated in the ink tank to the inkjet head; oxygen removing unit that removes oxygen from the ink to be supplied to the inkjet head; a discharging flow path that communicates with a discharge port of the inkjet head and the ink tank; a collecting pump that collects the ink to be discharged from the discharge port in the ink tank; and oxygen supplying unit that supplies oxygen to the ink to be collected in the ink tank. | 10-09-2014 |