Abstract: Disclosed is an arc welding control method of controlling a welding current in short-circuit arc welding of feeding a welding wire toward a base metal and alternating a short-circuit state and an arc state. The arc welding control method includes: executing, in the short-circuit state, a first increase in the welding current with a first slope, a first decrease in the welding current to a first bottom value after executing the first increase, a second increase in the welding current with a second slope after executing the first decrease, and a second decrease in the welding current to a second bottom value that is smaller than the first bottom value after executing the second increase to shift a state to the arc state.

Abstract: A process cartridge includes a photosensitive drum and a developing roller for developing a latent image on the photosensitive drum. The process cartridge also includes a protrusion having a surface configured to receive a force to move a frame supporting the developing roller from the first position in which the developing roller contacts the photosensitive drum to the second position in which the developing roller is spaced apart from the photosensitive drum.

Abstract: An arc welding control method is for performing control in an arc period. The control includes: (i) increasing a welding current to a first current value at a first gradient and maintaining the welding current at the first current value for a first period; (ii) reducing the welding current from the first current value to a second current value at a second gradient and maintaining the welding current at the second current value for a second period; (iii) increasing the welding current from the second current value to a third current value at a third gradient; and (iv) starting to reduce the welding current from the third current value within a third period, which is shorter than the first period, after the welding current reaches the third current value.

Abstract: An information processing device according to an embodiment of the present disclosure is provided with a memory unit including a stack area, and an information processing unit. The information processing unit executes, after executing a return instruction to a specific address, a determination process configured to determine whether an instruction placed at the specific address is an authentication code verification instruction, and verifies, in a case where the instruction placed at the specific address is consequently determined as the authentication code verification instruction, match or mismatch of an authentication code by executing the authentication code verification instruction.

Abstract: A surface acoustic wave resonator includes one IDT electrode and reflectors. When a distance between an electrode finger Fe(k) and an electrode finger Fe(k+1) is defined as a k-th electrode finger pitch, in an electrode finger Fe(k?1), the electrode finger Fe(k), and the electrode finger Fe(k+1), a value obtained by dividing a difference between the electrode finger pitch and a section average electrode finger pitch, which is an average of the electrode finger pitch and the electrode finger pitch, by an overall average electrode finger pitch is defined as a pitch deviation ratio, and a distribution obtained by calculating the pitch deviation ratio for all electrode fingers of the IDT electrode or the reflectors is defined as a histogram of the pitch deviation ratio, the IDT electrode or the reflectors have a standard deviation of the pitch deviation ratio in the histogram larger than or equal to about 0.2%.

Abstract: In a plan view in a thickness direction of a piezoelectric substrate, each of acoustic wave resonators includes a central region, a first region having a lower acoustic wave velocity than that of the central region, and a second region having a lower acoustic wave velocity than that of the central region. A first acoustic wave resonator includes a third region having a gap of about 0.3? or longer in a predetermined direction outside of the first region and having a higher acoustic velocity of the acoustic wave than that of the central region, and a fourth region having a gap of about 0.3? or longer in the predetermined direction outside of the second region and having a higher acoustic velocity of the acoustic wave than that of the central region. A second acoustic wave resonator does not include the third and fourth regions.

Abstract: A multiplexer includes first, second, and third filter circuits, and an additional circuit, at least a portion of which is connected in parallel to each of the first, second, and third filter circuits. The additional circuit includes first, second, and third IDTs and two reflectors. The first IDT is connected to a path connecting a first terminal and the first filter circuit or a path extending through an inside of the first filter circuit. The third IDT is connected to a path connecting a third terminal and the third filter circuit or a path extending through an inside of the third filter circuit. The second IDT is connected to a path connecting the first filter circuit and a common terminal, a path connecting the third filter circuit and the common terminal, or a path connecting the second filter circuit and the common terminal.

Abstract: An acoustic wave filter includes a longitudinally coupled resonator including IDT electrodes and a reflector. A standard deviation of a pitch deviation rate of at least one of the reflector and the IDT electrodes is greater than or equal to about 1.4%.

Abstract: An acoustic wave device includes a mounting substrate including a multilayer body that includes a first layer including first and second signal wiring lines at least partially facing each other, and a second layer including a ground electrode, and an acoustic wave filter on the mounting substrate and electrically connected to the first signal wiring line, the second signal wiring line, and the ground electrode. The ground electrode overlaps the first and second signal wiring lines, and a region between the first and second signal wiring lines in plan view. A portion of the second layer overlapping the inter-wiring-line region in plan view includes a ground electrode missing portion.

Abstract: An acoustic wave filter includes a piezoelectric substrate, a functional electrode, a first wiring portion, a mounting substrate, and a second wiring portion. The functional electrode and the first wiring portion are located at a first major surface of the piezoelectric substrate. The first wiring portion is connected to the functional electrode. The second wiring portion is located at a third major surface of the mounting substrate. The second wiring portion is connected to ground. The first major surface of the piezoelectric substrate, and the third major surface of the mounting substrate are opposite to each other. An inter-wiring distance is less than a wiring width of the first wiring portion. The inter-wiring distance is a distance between the first wiring portion, and a portion of the second wiring portion that overlaps the first wiring portion in plan view seen in the direction of thickness of the mounting substrate.

Abstract: A first receiving band and a first transmission band in band A and a second transmission band and a second receiving band in band B are listed in frequency order. A radio frequency module includes: first and second boards; a first filter having a passband that is the first transmission band; second and sixth filters each having a passband that is the first receiving band; third and fifth filters each having a passband that is the second receiving band; a first power amplifier connected to the first filter; a fourth filter having a passband that is the second transmission band; and a second power amplifier connected to the fourth filter. The first to third filters and the first power amplifier are disposed on the first board, and the fourth to sixth filters and the second power amplifier are disposed on the second board.

Abstract: An acoustic wave filter includes a first filter circuit with a predetermined frequency band as a pass band and provided on a first path connecting first and second signal terminals, and an additional resonant circuit connected in parallel with at least a portion of the first filter circuit. The additional resonant circuit includes an IDT electrode group including IDT electrodes positioned along an acoustic wave propagation direction. At least one resonant frequency of one or more resonant frequencies of the additional resonant circuit is included within the pass band of the first filter circuit.

Abstract: An acoustic wave filter includes a filter circuit and an additional circuit that includes IDTs and reflectors. The IDTs each include comb-shaped electrode fingers. The reflectors each include reflector electrode fingers. A relationship of about 0.60+n?G/(Pi+Pr)?0.93+n is satisfied, where n is an integer of 0 or more, Pi is an array pitch of the comb-shaped electrode fingers arranged along a second direction, Pr is an array pitch of the reflector electrode fingers arranged along the second direction, and G denotes, in boundary regions between the IDTs and the reflectors, an IDT-reflector gap, which is a center-to-center distance between a comb-shaped electrode finger closest to the reflectors and a reflector electrode finger closest to the IDTs.

Abstract: An acoustic wave filter includes a filter circuit connected to input-and-output terminals, and a canceling circuit connected in parallel to at least a portion of a first path connecting the input-and-output terminals. The filter circuit includes one or more series-arm resonators on the first path, and one or more parallel-arm resonators between the first path and a ground. The canceling circuit includes acoustic wave resonators in parallel or substantially in parallel in a propagation direction of an acoustic wave. At least one of the acoustic wave resonators is connected to the ground, and an anti-resonant frequency of the at least one of the acoustic wave resonators is in a pass band of the filter circuit.

Abstract: A longitudinally coupled resonator acoustic wave filter includes first and second IDT electrodes on a piezoelectric substrate. A direction in which electrode fingers of the IDT electrodes extend is a first direction, a direction perpendicular or substantially perpendicular to the first direction is a second direction, a ground-side busbar of the first IDT electrode and a hot-side busbar of the second IDT electrode face each other in the second direction, and the longitudinally coupled resonator acoustic wave filter includes a projecting portion, connected to the ground-side busbar of the first IDT electrode, that extends in the second direction toward the second IDT electrode beyond an interdigitated region of the first IDT electrode.

Abstract: An acoustic wave device includes a piezoelectric substrate, a first interdigital transducer electrode on the piezoelectric substrate, and a first reflector and a second reflector. The first interdigital transducer electrode, the first reflector, and the second reflector each include a plurality of electrode fingers. At least one of the first interdigital transducer electrode, the first reflector, and the second reflector has a nonuniform duty ratio area where three successive electrode fingers in an acoustic wave propagation direction all have different duty ratios.

Abstract: An acoustic wave filter includes a first filter circuit on a first path and an additional circuit connected to the first path. The first filter circuit includes a series arm resonator and a longitudinally coupled resonator. The longitudinally coupled resonator includes a first acoustic wave resonator and a first reflector. The additional circuit includes a second acoustic wave resonator on the opposite side of the first acoustic wave resonator with respect to the first reflector. The second acoustic wave resonator includes a first end connected to the first path through a second path and a second end connected to ground. The series arm resonator is connected to a portion of the first path between a connection node at which the second acoustic wave resonator is connected to the first path and the longitudinally coupled resonator.

Abstract: A filter module includes an inductor, a filter including first wiring, and second wiring between the inductor and the first wiring and being a direct-current floating potential. The inductor and the first wiring are magnetically coupled, the inductor and the second wiring are magnetically coupled, and the first wiring and the second wiring are capacitively coupled.

Abstract: A surface acoustic wave resonator includes one IDT electrode and reflectors. When a distance between an electrode finger Fe(k) and an electrode finger Fe(k+1) is defined as a k-th electrode finger pitch, in an electrode finger Fe(k?1), the electrode finger Fe(k), and the electrode finger Fe(k+1), a value obtained by dividing a difference between the electrode finger pitch and a section average electrode finger pitch, which is an average of the electrode finger pitch and the electrode finger pitch, by an overall average electrode finger pitch is defined as a pitch deviation ratio, and a distribution obtained by calculating the pitch deviation ratio for all electrode fingers of the IDT electrode or the reflectors is defined as a histogram of the pitch deviation ratio, the IDT electrode or the reflectors have a standard deviation of the pitch deviation ratio in the histogram larger than or equal to about 0.2%.

Abstract: An acoustic wave filter includes a longitudinally coupled resonator including IDT electrodes and a reflector. A standard deviation of a pitch deviation rate of at least one of the reflector and the IDT electrodes is greater than or equal to about 1.4%.