Abstract: An actuator is equipped with a body and a slider. Body side rail grooves are formed in side wall portions that constitute the body. On the other hand, slider side rail grooves are formed in the slider. Body side guide rails and slider side guide rails are provided in the body side rail grooves and the slider side rail grooves, respectively. Circular arc grooves serving as ball grooves are formed by body side ball receiving portions of the body side guide rails, and slider side ball receiving portions of the slider side guide rails.

Abstract: An actuator is equipped with a body and a slider. Body side rail grooves are formed in side wall portions that constitute the body. On the other hand, slider side rail grooves are formed in the slider. Body side guide rails and slider side guide rails are provided in the body side rail grooves and the slider side rail grooves, respectively. Circular arc grooves serving as ball grooves are formed by body side ball receiving portions of the body side guide rails, and slider side ball receiving portions of the slider side guide rails.

Abstract: A shock absorber includes a cylinder housing including a piston chamber in which oily liquid is disposed, a piston movable in the piston chamber, a rod connected to the piston and protruding out from the cylinder housing, and a return mechanism for the rod. In the shock absorber, a cylindrical bearing made of a synthetic resin having a shock-absorbing property, a dust collecting member for avoiding entry of dust particles, and a lubricating member for supplying a lubricating oil to a surface of the rod are disposed in a rod guiding hole in the cylinder housing. A leading end of the bearing protrudes outside with respect to an outer end surface of the cylinder housing and acts as a contact portion that allows a moving object to come into contact therewith, and thus the bearing functions to guide the rod and also functions as a stopper for avoiding the moving object from coming into contact with the outer end surface of the cylinder housing.

Abstract: A bidirectional shock absorber includes a cylinder housing including a liquid chamber, a shock-absorbing mechanism located inside the liquid chamber and supported by a rod sticking out of the cylinder housing. The shock-absorbing mechanism includes a pair of pistons located in the liquid chamber and attached to the rod on the respective sides of a liquid storage chamber constituting an accumulator, resistance paths formed between an outer circumferential surface of the pistons and an inner circumferential surface of a piston chamber, to apply flow resistance to the liquid, and unidirectional flow paths formed along the respective pistons and configured to block the liquid flow toward the liquid storage chamber when the corresponding piston is pressed toward the piston chamber, but to permit the liquid to flow in the opposite direction.

Abstract: A shock absorber includes a cylinder housing including a piston chamber in which oily liquid is disposed, a piston movable in the piston chamber, a rod connected to the piston and protruding out from the cylinder housing, and a return mechanism for the rod. In the shock absorber, a cylindrical bearing made of a synthetic resin having a shock-absorbing property, a dust collecting member for avoiding entry of dust particles, and a lubricating member for supplying a lubricating oil to a surface of the rod are disposed in a rod guiding hole in the cylinder housing. A leading end of the bearing protrudes outside with respect to an outer end surface of the cylinder housing and acts as a contact portion that allows a moving object to come into contact therewith, and thus the bearing functions to guide the rod and also functions as a stopper for avoiding the moving object from coming into contact with the outer end surface of the cylinder housing.

Abstract: A liquid ejection device includes an ink jet head in which a plurality of nozzle portions are arranged in a matrix; a plurality of pressurizing elements that generate an ejection force; and a driving voltage supply unit that supplies a driving voltage to the pressurizing elements. In the device, the ink jet head is provided with supply flow paths, the nozzle portions which are supplied with the liquid from the same the supply flow path are divided into two or more groups, the driving voltage supply unit supplies an ejection driving voltage for ejecting the liquid to each of the groups when a dummy jet is performed, and during a period of time when the dummy jet is performed for one group, the driving voltage supply unit supplies a non-ejection driving voltage for preventing the liquid from being ejected to the other groups.

Abstract: A double-rod type shock absorber includes a rod, first and second pistons held by the rod, first and second piston chambers disposed on an outer side of the first and second pistons, a liquid storage chamber between the first piston and the second piston, a flow path gap formed between an outer peripheral surface of the first and second pistons and an inner peripheral surface of the liquid chamber, and first and second unidirectional flow paths which connect the first and second piston chambers with the liquid storage chamber, wherein, during reciprocating motion of the rod, the unidirectional flow path located on a front side in a movement direction of the rod is closed, and the unidirectional flow path located on a back side in the movement direction of the rod is opened.

Abstract: A liquid ejection device includes an ink jet head in which a plurality of nozzle portions are arranged in a matrix; a plurality of pressurizing elements that generate an ejection force; and a driving voltage supply unit that supplies a driving voltage to the pressurizing elements. In the device, the ink jet head is provided with supply flow paths, the nozzle portions which are supplied with the liquid from the same the supply flow path are divided into two or more groups, the driving voltage supply unit supplies an ejection driving voltage for ejecting the liquid to each of the groups when a dummy jet is performed, and during a period of time when the dummy jet is performed for one group, the driving voltage supply unit supplies a non-ejection driving voltage for preventing the liquid from being ejected to the other groups.

Abstract: A double-rod type shock absorber includes a rod, first and second pistons held by the rod, first and second piston chambers disposed on an outer side of the first and second pistons, a liquid storage chamber between the first piston and the second piston, a flow path gap formed between an outer peripheral surface of the first and second pistons and an inner peripheral surface of the liquid chamber, and first and second unidirectional flow paths which connect the first and second piston chambers with the liquid storage chamber, wherein, during reciprocating motion of the rod, the unidirectional flow path located on a front side in a movement direction of the rod is closed, and the unidirectional flow path located on a back side in the movement direction of the rod is opened.

Abstract: A bidirectional shock absorber includes a cylinder housing including a liquid chamber, a shock-absorbing mechanism located inside the liquid chamber and supported by a rod sticking out of the cylinder housing. The shock-absorbing mechanism includes a pair of pistons located in the liquid chamber and attached to the rod on the respective sides of a liquid storage chamber constituting an accumulator, resistance paths formed between an outer circumferential surface of the pistons and an inner circumferential surface of a piston chamber, to apply flow resistance to the liquid, and unidirectional flow paths formed along the respective pistons and configured to block the liquid flow toward the liquid storage chamber when the corresponding piston is pressed toward the piston chamber, but to permit the liquid to flow in the opposite direction.

Abstract: A liquid ejection head includes: a flow channel unit having a plurality of pressure chambers arranged in a plane; and piezoelectric actuators which change volume of the plurality of pressure chambers so as to apply pressure to liquid inside the plurality of the pressure chambers respectively, wherein the piezoelectric actuators comprise: a diaphragm which constitutes one wall of the plurality of pressure chambers; a common electrode formed on a surface of the diaphragm; a piezoelectric layer formed on a surface of the common electrode; a plurality of ring-shaped individual electrodes formed on a surface of the piezoelectric layer and formed in regions which overlap respectively with marginal portions which are non-central portions of the plurality of pressure chambers, as viewed from a direction perpendicular to the plane; and central electrodes connected electrically to the common electrode, and formed so as not to make contact with the plurality of ring-shaped individual electrodes in inner regions of the p

Abstract: An inkjet head includes: a plurality of nozzle plates which are arranged in a width direction of a recording medium and each of which has a plurality of nozzles for ejecting ink and has a hydrophobic property; and cleaning liquid holding members which are provided respectively on both sides of the plurality of nozzle plates in terms of a direction perpendicular to a direction of arrangement of the plurality of nozzle plates so as to extend substantially in parallel with the direction of arrangement of the plurality of nozzle plates, and which have a lower hydrophobic property than the plurality of nozzle plates, wherein the cleaning liquid holding members include a cleaning liquid holding mechanism for holding cleaning liquid.

Abstract: Provided is a shock absorber enabling stable stop by damping at a terminal of a stroke and covering demanded impact-absorbing models. The shock absorber has a piston chamber, a start part for piston movement, a decelerating part, and an end part for stopping the piston. The start part forms a curve to provide a diameter larger than a virtual tapered surface formed within a stroke range of the piston and to be outward to a central axis of the piston chamber. In the decelerating part, a variation of diameter reduction is increased with the result that the diameter becomes smaller than the tapered surface, and a curve is formed so the change in variation of diameter reduction reaches the maximum variation point and turns negative. In the end part, the variation of diameter reduction is decreased with the result that a curve which enables piston stopping by damping is formed.

Abstract: A liquid ejection head including a piezoelectric actuator is disclosed. The piezoelectric actuator is manufactured by the following steps: carrying out a first heat treatment of a diaphragm of stainless steel containing iron, chromium and aluminum, in a gas containing oxygen, so as to form an aluminum oxide film on a first surface of the diaphragm and form a chromium oxide film between the aluminum oxide film and the first surface of the diaphragm; forming a lower electrode on the aluminum oxide film; forming a piezoelectric body on a surface of the lower electrode reverse to a surface of the lower electrode on which the chromium oxide film and the aluminum oxide film are formed; forming an upper electrode on a surface of the piezoelectric body reverse to a surface of the piezoelectric body on which the lower electrode is formed; and calcining the piezoelectric body by carrying out a second heat treatment of the diaphragm with which the piezoelectric body is provided.

Abstract: Provided is a shock absorber enabling stable stop by damping at a terminal of a stroke and covering demanded impact-absorbing models. The shock absorber has a piston chamber, a start part for piston movement, a decelerating part, and an end part for stopping the piston. The start part forms a curve to provide a diameter larger than a virtual tapered surface formed within a stroke range of the piston and to be outward to a central axis of the piston chamber. In the decelerating part, a variation of diameter reduction is increased with the result that the diameter becomes smaller than the tapered surface, and a curve is formed so the change in variation of diameter reduction reaches the maximum variation point and turns negative. In the end part, the variation of diameter reduction is decreased with the result that a curve which enables piston stopping by damping is formed.

Abstract: An inkjet head includes: a plurality of nozzle plates which are arranged in a width direction of a recording medium and each of which has a plurality of nozzles for ejecting ink and has a hydrophobic property; and cleaning liquid holding members which are provided respectively on both sides of the plurality of nozzle plates in terms of a direction perpendicular to a direction of arrangement of the plurality of nozzle plates so as to extend substantially in parallel with the direction of arrangement of the plurality of nozzle plates, and which have a lower hydrophobic property than the plurality of nozzle plates, wherein the cleaning liquid holding members include a cleaning liquid holding mechanism for holding cleaning liquid.

Abstract: A method of manufacturing a liquid ejection head comprising: bonding together a diaphragm made of a stainless steel substrate containing iron, chromium and aluminum, and a pressure chamber formation substrate which has a space for a pressure chamber and is made of stainless steel containing chromium and aluminum, by diffusion bonding, in such a manner that a structural body including the diaphragm and the pressure chamber formation substrate is formed; carrying out a first heat treatment of the structural body so as to form an aluminum oxide film on a surface of the structural body and form a chromium oxide film between the aluminum oxide film and the structural body; forming a lower electrode on the aluminum oxide film; forming a piezoelectric body on a surface of the lower electrode reverse to a surface of the lower electrode on which the chromium oxide film and the aluminum oxide film are formed; forming an upper electrode on a surface of the piezoelectric body reverse to a surface of the piezoelectric bod

Abstract: The method of manufacturing a piezoelectric actuator, includes the steps of: forming a lower electrode film on an insulating substrate; forming a piezoelectric film on the lower electrode film; forming a slit on the piezoelectric film to expose a portion of the lower electrode film on an upper surface side of the piezoelectric film; forming an insulating layer which covers a portion of the piezoelectric film; forming an upper electrode film so as to span the insulating layer and the piezoelectric film; forming, on the piezoelectric film, a lower wire in connection with the portion of the lower electrode film exposed through the slit; depositing a first metal film on the lower wire and thereby making a film thickness of the lower wire greater than a film thickness of the lower electrode film; and depositing a second metal film on a portion of the upper electrode film on the insulating layer and thereby making a film thickness of the portion of the upper electrode film on the insulating layer greater than a fil

Abstract: The liquid ejection head comprises: a pressure chamber which is connected to a nozzle; a diaphragm which constitutes one face of the pressure chamber; and a piezoelectric element which deforms the diaphragm for ejecting liquid inside the pressure chamber through the nozzle, wherein the liquid is ejected by driving the piezoelectric element in a temperature region in which a tendency of increase or decrease in viscosity of the liquid with respect to temperature of the liquid and a tendency of increase or decrease in a piezoelectric d constant of the piezoelectric element with respect to temperature of the piezoelectric element have a prescribed relationship.