Abstract: An object of the present invention is to provide a hairspring, a timepiece movement, and a timepiece. A hairspring according to the present invention is characterized by being made of a Nb-Mo alloy containing 5% or more and 14% or less of Mo in at%. Alternatively, a hairspring according to the present invention is characterized by being made of a Nb-Mo alloy containing 5% or more and 14% or less of Mo in at%, inevitable impurities and balance Nb. It is preferable that the hairspring has a deformation texture and a region having a <110>||{001} orientation degree in a cross section is 30% or more of an entire cross-sectional area.

Abstract: A personal ornament has excellent corrosion resistance, in which predetermined chemical components are included, the remainder includes Fe and impurities, a structure contains austenite at 95% or more in area %, when a diameter of a circle having a smallest area capable of including one intermetallic compound inside is defined as a size of the intermetallic compound, the number of intermetallic compounds in which the size of the intermetallic compound is 150 ?m or more is 0, and the number of intermetallic compounds in which the size is 13 ?m or more and less than 150 ?m is 3 or less, an average equivalent circle diameter of the austenite is 150 ?m or less, and a PRE defined by the following formula (1) is 40 or more. PRE=[Cr]+3.

Abstract: A personal ornament has excellent corrosion resistance, in which predetermined chemical components are included, the remainder includes Fe and impurities, a structure contains austenite at 95% or more in area %, when a diameter of a circle having a smallest area capable of including one intermetallic compound inside is defined as a size of the intermetallic compound, the number of intermetallic compounds in which the size of the intermetallic compound is 150 ?m or more is 0, and the number of intermetallic compounds in which the size is 13 ?m or more and less than 150 ?m is 3 or less, an average equivalent circle diameter of the austenite is 150 ?m or less, and a PRE defined by the following formula (1) is 40 or more. PRE=[Cr]+3.

Abstract: A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. The alloy consists of Co, Ni, Cr, Mo. and Fe. The alloy is healed and cooled before being subjected to repeated wiredrawing and intermediate annealing, forming a wire with a fiber structure having a <111> fiber axis. The wire is then cold rolled into a sheet and heated to obtain optimal magnetic insensitivity and hardness.

Abstract: [Task] A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. [Means for Solution] The alloy consists essentially of, by atomic weight ratio, 20 to 40% Co and 7 to 22% Ni, with the total of Co and Ni being 42.0 to 49.5%, 5 to 13% Cr and 1 to 6% Mo, with the total of Cr and Mo being 13.5 to 16.0%, and with the balance being essentially Fe (with the proviso that Fe is present in an amount of 37% or more) and inevitable impurities. The alloy is heated to a temperature of 1100 degrees C. or higher and lower than the melting point, followed by cooling. The alloy is subsequently subjected to repeated wiredrawing and intermediate annealing at 800 to 950 degrees C., thereby forming a wire at a working ratio of 90% or more.

Abstract: An ink-jet print head has a piezoelectric ceramic plate having grooves for receiving ink, a nozzle plate connected to the piezoelectric ceramic plate and having nozzle apertures each disposed in communication with respective ones of the grooves, and an ink storing device for storing ink. An ink chamber plate is connected to the piezoelectric ceramic plate and has an ink chamber for supplying ink from the ink storing device to the grooves. A base plate is connected to a side of the ink chamber plate and has an ink reservoir defining a portion of an ink flow path for transporting ink from the ink storing device to the ink chamber of the ink chamber plate. The ink reservoir has at least one tapered portion progressively diverging in a direction toward the ink chamber of the ink chamber plate.

Abstract: To provide an ink jet head and an ink jet recording apparatus in which it is possible to reliably prevent ink bubbles from staying in the ink sump and the interior of the head chip and in which it is relatively easy to remove the bubbles. The ink jet head includes: a plurality of grooves arranged side by side so as to communicate with nozzle openings; an ink chamber for supplying ink to each of the grooves; an ink sump provided so as to communicate with the ink chamber; and ink storage unit (50) communicating with the ink sump through ink supply passages, in which there is provided an air duct (100) establishing communication between a region in the ink sump which is substantially free from interference with an ink flow from the ink supply passages (33) to the ink chamber and in which bubbles easily gather and an air region of the ink storage unit (50). Therefore, the bubbles in the ink can be surely removed.

Abstract: Providing an ink-jet print head and ink-jet recording apparatus capable of preventing the dwell of air bubbles contained in ink and relatively easily removing the air bubbles. In an ink-jet print head 10 comprising a plurality of grooves 22 communicated with nozzle apertures 28; an ink chamber 26 for supplying ink to the individual grooves 22; and an ink reservoir 31 defining a communication portion of a flow path with the ink chamber 26, the flow path intercommunicating ink storage means for storing the ink and the ink chamber 26, the ink reservoir 31 includes at least one of a tapered portion 37 opened progressively wider toward the ink chamber 26 and a throttling portion 38 progressively narrowing the flow path toward the ink chamber 26.

Abstract: To provide an ink jet head and an ink jet recording apparatus in which it is possible to reliably prevent ink bubbles from staying in the ink sump and the interior of the head chip and in which it is relatively easy to remove the bubbles. The ink jet head includes: a plurality of grooves arranged side by side so as to communicate with nozzle openings; an ink chamber for supplying ink to each of the grooves; an ink sump provided so as to communicate with the ink chamber; and ink storage unit (50) communicating with the ink sump through ink supply passages, in which there is provided an air duct (100) establishing communication between a region in the ink sump which is substantially free from interference with an ink flow from the ink supply passages (33) to the ink chamber and in which bubbles easily gather and an air region of the ink storage unit (50). Therefore, the bubbles in the ink can be surely removed.