Abstract: A filter comprises a series unit comprising a plurality of series resonators, a shunt unit comprising a plurality of shunt resonators, connected between the plurality of series resonators and a ground, and a correction unit comprising an inductor unit connected between both ends of at least one of a set of series resonators of the plurality of series resonators and a set of shunt resonators of the plurality of shunt resonators, and an impedance unit connected between the inductor unit and a ground.

Abstract: A filter includes: series resonators connected to each other in series; shunt resonators connected to first nodes between some of the series resonators; and a variable capacitor connected to a second node between some of the series resonators, and forming a pole configured to suppress harmonics.

Abstract: A bulk acoustic wave resonator includes a substrate including a cavity groove, a membrane layer disposed above the substrate and including a convex portion. And a lower electrode including a portion thereof disposed on the convex portion. The bulk acoustic wave resonator also includes a piezoelectric layer configured so that a portion of the piezoelectric layer is disposed above the convex portion, and an upper electrode disposed on the piezoelectric layer. A first space formed by the cavity groove and a second space formed by the convex portion form a cavity, the cavity groove is disposed below an active region, and the convex portion comprises an inclined surface disposed outside of the cavity groove.

Abstract: A bulk acoustic wave resonator includes: support members disposed between air cavities; a resonant part including a first electrode, a piezoelectric layer, and a second electrode sequentially disposed above the air cavities and on the support members; and a wiring electrode connected either one or both of the first electrode and the second electrode, and disposed above one of the air cavities, wherein a width of an upper surface of the support members is greater than a width of a lower surface of the support members, and side surfaces of the support members connecting the upper surface and the lower surface to each other are inclined.

Abstract: A filter includes: series resonators connected to each other in series; shunt resonators connected to first nodes between some of the series resonators; and a variable capacitor connected to a second node between some of the series resonators, and forming a pole configured to suppress harmonics.

Abstract: A filter includes a multilayer structure having films configured as bulk acoustic wave resonators; a wiring line connected to the bulk acoustic wave resonators; a cap coupled to the multilayer structure on a bonding line; and the filtering characteristics of the filter being configured through a mutual inductance between the wiring line and the bonding line.

Abstract: A filter includes a multilayer structure comprising films and forming bulk acoustic wave resonators, a cap accommodating the bulk acoustic wave resonators and bonded to the multilayer structure, a bonding agent disposed in a bonded area between the multilayer structure and the cap and comprising a bonding layer, and a shielding layer disposed on an inner surface of the cap and comprising a same material as at least a portion of the bonding layer.

Abstract: There is provided an acoustic transducer including an electrode substrate having a plurality of holes formed therein and having a first electrode thereon, a diaphragm disposed so as to face the electrode substrate and having a second electrode thereon to form an electric field in a space between the diaphragm and the electrode substrate, and a plurality of protrusions formed on the diaphragm and having the second electrode to form electric fields in the plurality of holes.

Abstract: There is provided a microphone including: a thin film member including leg members extended in a direction not in parallel with a vibration direction; first supports supporting first points of the leg members, respectively; and a piezoelectric member connected to second points of the leg members and converting vibrations of the thin film member into electrical signals.

Abstract: There is provided an acoustic transducer including: a substrate formed to have a hollow part through which acoustic waves are input; a diaphragm formed on the substrate and covering the hollow part; and a back plate disposed so as to cover at least a portion of the diaphragm, wherein a ring-shaped groove extended along an edge of the diaphragm is formed in the substrate.

Abstract: There is provided an inkjet print head including: an ink discharging unit including a plurality of actuators; a connection substrate disposed on the ink discharging unit and having a first circuit pattern electrically connected to the plurality of actuators; and a switching board having a second circuit pattern connected to the first circuit pattern and including a plurality of driving integrated chips (ICs) controlling the plurality of actuators.

Abstract: There is provided an inkjet print head, including: a first pressure chamber connected to a common channel; a second pressure chamber connected to the common channel and disposed in parallel with the first pressure chamber; a connection channel connecting the first pressure chamber and the second pressure chamber; and a nozzle formed in the first pressure chamber or the second pressure chamber.

Abstract: There is provided an inkjet print head, including: a first pressure chamber connected to a first common channel; a second pressure chamber connected to a second common channel; a connection channel connecting the first pressure chamber to the second pressure chamber; and a nozzle formed in the first pressure chamber or the second pressure chamber.

Abstract: There is provided an inkjet print head including: a nozzle substrate having a nozzle and a pressure chamber formed therein; and a vibrating substrate coupled to the nozzle substrate and transferring pressure from a piezoelectric actuator to the pressure chamber, wherein the vibrating substrate has a plurality of pores absorbing a pressure wave generated in a process of discharging ink.

Abstract: There is provided an inkjet head and an inkjet head assembly having the same. The inkjet head includes an inkjet head plate having a plurality of nozzles ejecting ink provided therein; pressure chambers storing ink drawn in from both outer ends of the inkjet head plate in a width direction thereof and facing each other in a direction inwards of the width direction; piezoelectric elements supplying the pressure champers with driving force allowing ink to be ejected through the nozzles connected to the pressure chambers and disposed on the pressure chambers having membranes interposed therebetween; a pressure adjusting channel connecting the pressure chambers to adjust a pressure of ink ejected through the nozzles.

Abstract: Disclosed is an inkjet printer. The inkjet printer in accordance with an embodiment of the present invention includes a supply channel coupled to a plurality of inkjet heads; a first main reservoir and a second main reservoir being coupled to either side of the supply channel; and a first press and a second press applying pressure to the inside of the first main reservoir and the second main reservoir, respectively.

Abstract: An inkjet head is disclosed. The inkjet head, which include a head body, having one side, in which a nozzle is formed to discharge ink; and a protrusion, formed in one side of the head body, spaced from the nozzle, can form a groove on the surface of a printing target in the printing and then discharge ink in the groove, thereby increasing the aspect ratio of a printed line.

Abstract: There is provided an inkjet print head that includes: an inkjet head plate with a plurality of head cells including ink passages where introduced ink is ejected through a nozzle by passing through a pressure chamber; and a piezoelectric actuator formed on the top of the inkjet head plate and formed at a position corresponding to the pressure chamber, wherein the area of at least one of the pressure chamber and the piezoelectric actuator is changed to make ejection characteristics of the ink ejected from the plurality of head cells uniform.

Abstract: There is provided a method of manufacturing an inkjet head. A method of manufacturing an inkjet head according to an aspect of the invention may include: forming a piezoelectric actuator on a dummy substrate; cutting the piezoelectric actuator into head cell units of an inkjet head; preparing an inkjet head substrate including an ink chamber formed at a position corresponding to the piezoelectric actuator; bonding the dummy substrate and the inkjet head substrate to each other so that the piezoelectric actuator and the ink chamber correspond to each other; and removing the dummy substrate.

Abstract: An apparatus for cleaning an inkjet print head includes: a cleaning plate disposed to correspond to an inkjet print head with an ink flow space interposed therebetween; and a pneumatic device installed in the ink flow space and removing ink in a direction different from a direction in which ink is discharged by changing a fluid pressure of the ink remaining at a nozzle of the inkjet print head.