Abstract: In the field of automobile steering gear manufacturing, an automatic air-discharge valve is provided having a valve body, a valve seat, a steel ball and a pressure regulation spring. The valve body is externally connected to a piston. The valve body is internally provided with an air-discharge channel having various diameters which is capable of accommodating the valve seat, the pressure regulation spring and the steel ball. The steel ball may be accommodated in the middle of the air-discharge channel of the valve body. A pressure regulation spring is arranged on left and right sides of the steel ball. The pressure regulation spring comprises a left spring and a right spring, one end of the left spring being supported by the valve body and the other end thereof being supported by the steel ball, and one end of the right spring being supported by the valve seat, and the other end thereof being supported by the steel ball.

Abstract: A piezoelectric thin film (PTF) is located above a carrier substrate. The PTF may be X-cut LiNbO3 thin film adapted to propagate an acoustic wave in at least one of a first mode excited by an electric field oriented in a longitudinal direction along a length of the PTF or a second mode excited by the electric field oriented at least partially in a thickness direction of the PTF. A first interdigitated transducer (IDT) is disposed on a first end of the PTF. The first IDT is to convert a first electromagnetic signal, traveling in the longitudinal direction, into the acoustic wave. A second IDT is disposed on a second end of the PTF with a gap between the second IDT and the first IDT. The second IDT is to convert the acoustic wave into a second electromagnetic signal.

Abstract: A method for manufacturing a piezoelectric transducer, comprising: forming, on a piezoelectric wafer, a first mark parallel to or perpendicular to a preset direction of the piezoelectric transducer; forming, on a carrier wafer, a second mark parallel to or perpendicular to a cutting direction of the carrier wafer, the shape of the second mark being the same as that of the first mark; and aligning the first mark and the second mark, and then bonding the piezoelectric wafer and the carrier wafer to form a process wafer, a first surface of the process wafer where the piezoelectric wafer is provided being used for forming the piezoelectric transducer. The preset direction of the piezoelectric transducer is made to be parallel to or perpendicular to the cutting direction of the carrier wafer by means of the first mark on the piezoelectric wafer and the second mark on the carrier wafer.

Abstract: An apparatus includes a piezoelectric thin film suspended above a carrier substrate, where the piezoelectric thin film is of one of lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) adapted to propagate an acoustic wave in a Lamb wave mode excited by a component of an electric field that is oriented in a longitudinal direction along a length of the piezoelectric thin film. A signal electrode is disposed on, and in physical contact with, the piezoelectric thin film and oriented perpendicular to the longitudinal direction. A ground electrode disposed on, and in physical contact with, the piezoelectric thin film and oriented perpendicular to the longitudinal direction, where the ground electrode is separated from the signal electrode by a gap comprising a longitudinal distance and in which the acoustic wave resonates. A release window is formed within the piezoelectric thin film adjacent to the ground electrode.

Abstract: A piezoelectric thin film (PTF) is located above a carrier substrate. The PTF may be Z-cut LiNbO3 thin film adapted to propagate an acoustic wave in at least one of a first mode excited by an electric field oriented in a longitudinal direction along a length of the PTF or a second mode excited by the electric field oriented at least partially in a thickness direction of the PTF. A first interdigitated transducer (IDT) is disposed on a first end of the PTF. The first IDT is to convert a first electromagnetic signal, traveling in the longitudinal direction, into the acoustic wave. A second IDT is disposed on a second end of the PTF with a gap between the second IDT and the first IDT. The second IDT is to convert the acoustic wave into a second electromagnetic signal, and the gap determines a time delay of the acoustic wave.

Abstract: A device includes a stack of at least two piezoelectric layers configured to propagate a Lamb wave in a mode having an order corresponding to a number of piezoelectric layers of the stack. The stack includes a first piezoelectric layer and a second piezoelectric layer disposed on the first piezoelectric layer. The first piezoelectric layer has a first cut plane orientation, and the second piezoelectric layer has a second cut plane orientation complementary to the first cut plane orientation. The device further includes an interdigitated transducer (IDT) disposed on at least a top surface of the stack or a bottom surface of the stack. In some embodiments, the device is an acoustic resonator. In some embodiments, the device is an acoustic delay line.

Abstract: Disclosed are a resonant device and an acoustic filter. The resonant device includes a wafer substrate, a piezoelectric layer and an interdigital electrode layer. The piezoelectric layer is located on a side of the wafer substrate and includes a piezoelectric monocrystal material, and the piezoelectric monocrystal material includes a first crystal axis, a second crystal axis and a third crystal axis perpendicular to each other. A direction of an electric field generated by the interdigital electrode layer in the piezoelectric layer is a device direction.

Abstract: An inductive wireless power transfer apparatus includes a source coil coupled to a power source such that current flows through the source coil when the source coil is excited by the power source. The apparatus further includes a first capacitor coupled in series to the source coil. The apparatus further includes an intermediate coil surrounding the source coil and positioned within an identical plane as the source coil, and a second capacitor coupled in series to the intermediate coil. The capacitances of the first capacitor and the second capacitor are set to tune out self-inductances of the source coil and the intermediate coil. In embodiments, the source coil is to inductively power the intermediate coil, which is to inductively power a load coil positioned a distance away from the intermediate coil.

Abstract: An acoustic resonator includes a piezoelectric thin film (PTF) disposed on a carrier substrate. The PTF confines a fundamental shear-horizontal (SH0) surface-acoustic wave (SAW) within the PTF. The acoustic resonator includes an input bus line coupled to an input source and a ground bus line coupled to a ground potential. The acoustic resonator includes a first grating reflector disposed at a first end of the PTF and coupled between the input bus line and the ground bus line. The acoustic resonator includes a second grating reflector disposed at a second end of the PTF and coupled between the input bus line and the ground bus line. The acoustic resonator includes interdigital transducers (IDTs) disposed between the first grating reflector and the second grating reflector. Each IDT includes an input electrode coupled to the input bus line, and a ground electrode coupled to the ground bus line.

Abstract: A piezoelectric thin film suspended above a carrier substrate is adapted to propagate an acoustic wave in a Lamb mode excited by a component of an electric field that is oriented in a longitudinal direction along a length of the piezoelectric thin film. A first signal electrode is located on the piezoelectric thin film and oriented in a transverse direction perpendicular to the longitudinal direction. A first ground electrode is located on the piezoelectric thin film and oriented in the transverse direction. The first ground electrode is separated from the first signal electrode by a gap in which the acoustic wave resonates. A first release window and a second release window are located at a first end and a second end of the piezoelectric thin film, respectively. Intermittent release windows are located beyond distal ends of the first signal electrode and the first ground electrode.

Abstract: An apparatus includes a piezoelectric thin film suspended above a carrier substrate, where the piezoelectric thin film is of one of lithium niobate (LiNbO3) or lithium tantalate (LiTaO3) adapted to propagate an acoustic wave in a Lamb wave mode excited by a component of an electric field that is oriented in a longitudinal direction along a length of the piezoelectric thin film. A signal electrode is disposed on, and in physical contact with, the piezoelectric thin film and oriented perpendicular to the longitudinal direction. A ground electrode disposed on, and in physical contact with, the piezoelectric thin film and oriented perpendicular to the longitudinal direction, where the ground electrode is separated from the signal electrode by a gap comprising a longitudinal distance and in which the acoustic wave resonates. A release window is formed within the piezoelectric thin film adjacent to the ground electrode.

Abstract: A piezoelectric thin film (PTF) is located above a carrier substrate. The PTF can be an aluminum nitride thin film adapted to propagate an acoustic wave in at least one of a first mode excited by an electric field oriented at least partially in a longitudinal direction along a length of the PTF or a second mode excited by the electric field oriented in a thickness direction of the PTF. A first interdigitated transducer (IDT) is disposed on a first end of the PTF and converts a first electromagnetic signal, traveling in the longitudinal direction, into the acoustic wave. A second IDT is disposed on a second end of the PTF with a gap between the second IDT and the first IDT. The second IDT is to convert the acoustic wave into a second electromagnetic signal, and the gap determines a time delay of the acoustic wave.

Abstract: A piezoelectric thin film (PTF) is located above a carrier substrate. The PTF may be Z-cut LiNbO3 thin film adapted to propagate an acoustic wave in at least one of a first mode excited by an electric field oriented in a longitudinal direction along a length of the PTF or a second mode excited by the electric field oriented at least partially in a thickness direction of the PTF. A first interdigitated transducer (IDT) is disposed on a first end of the PTF. The first IDT is to convert a first electromagnetic signal, traveling in the longitudinal direction, into the acoustic wave. A second IDT is disposed on a second end of the PTF with a gap between the second IDT and the first IDT. The second IDT is to convert the acoustic wave into a second electromagnetic signal, and the gap determines a time delay of the acoustic wave.

Abstract: A piezoelectric thin film (PTF) is located above a carrier substrate. The PTF may be X-cut LiNbO3 thin film adapted to propagate an acoustic wave in at least one of a first mode excited by an electric field oriented in a longitudinal direction along a length of the PTF or a second mode excited by the electric field oriented at least partially in a thickness direction of the PTF. A first interdigitated transducer (IDT) is disposed on a first end of the PTF. The first IDT is to convert a first electromagnetic signal, traveling in the longitudinal direction, into the acoustic wave. A second IDT is disposed on a second end of the PTF with a gap between the second IDT and the first IDT. The second IDT is to convert the acoustic wave into a second electromagnetic signal.

Abstract: A float switch, including a junction box, a switch, a guide rod, a float, a link mechanism, and a seal assembly. The switch is disposed in the junction box. The junction box is tightly coupled to the link mechanism. The float is flexibly disposed on the guide rod. The link mechanism includes a sealing member, a cylindrical pin, a connecting rod, a support, and a shift fork; one end of the link mechanism is connected to the switch via the shift fork, and the other end of the link mechanism is connected to the guide rod. The support includes a first through hole and a second through hole which are perpendicular to one another. The connecting rod includes a through hole corresponding to the second through hole of the support. The connecting rod runs through the first through hole of the support.

Abstract: A float switch, including a junction box, a switch, a guide rod, a float, a link mechanism, and a seal assembly. The switch is disposed in the junction box. The junction box is tightly coupled to the link mechanism. The float is flexibly disposed on the guide rod. The link mechanism includes a sealing member, a cylindrical pin, a connecting rod, a support, and a shift fork; one end of the link mechanism is connected to the switch via the shift fork, and the other end of the link mechanism is connected to the guide rod. The support includes a first through hole and a second through hole which are perpendicular to one another. The connecting rod includes a through hole corresponding to the second through hole of the support. The connecting rod runs through the first through hole of the support.

Abstract: An inductive wireless power transfer apparatus includes a source coil coupled to a power source such that current flows through the source coil when the source coil is excited by the power source. The apparatus further includes a first capacitor coupled in series to the source coil. The apparatus further includes an intermediate coil surrounding the source coil and positioned within an identical plane as the source coil, and a second capacitor coupled in series to the intermediate coil. The capacitances of the first capacitor and the second capacitor are set to tune out self-inductances of the source coil and the intermediate coil. In embodiments, the source coil is to inductively power the intermediate coil, which is to inductively power a load coil positioned a distance away from the intermediate coil.