摘要:
An elastic wave device includes a first unbalanced terminal, a second unbalanced terminal, a first balanced terminal, a second balanced terminal, a first filter part, and a second filter part. A phase of an electric signal transmitted from first unbalanced terminal to the first balanced terminal in the first filter part is different from a phase of an electric signal transmitted from the second unbalanced terminal to the first balanced terminal in the second filter part. A phase of an electric signal transmitted from the first unbalanced terminal to the second balanced terminal in the first filter part is different from a phase of an electric signal transmitted from the second unbalanced terminal to the second balanced terminal in the second filter part.
摘要:
An elastic wave device includes a piezoelectric substrate, a pair of reflectors disposed on the piezoelectric substrate along the propagation direction of an elastic wave, and first to fifth comb electrode pairs disposed in this order between the pair of reflectors. Ground comb electrodes of adjacent comb electrode pairs are connected by an even number of connection electrode fingers or by an odd number of connection electrode fingers.
摘要:
An elastic wave device includes a first unbalanced terminal, a second unbalanced terminal, a first balanced terminal, a second balanced terminal, a first filter part, and a second filter part. A phase of an electric signal transmitted from first unbalanced terminal to the first balanced terminal in the first filter part is different from a phase of an electric signal transmitted from the second unbalanced terminal to the first balanced terminal in the second filter part. A phase of an electric signal transmitted from the first unbalanced terminal to the second balanced terminal in the first filter part is different from a phase of an electric signal transmitted from the second unbalanced terminal to the second balanced terminal in the second filter part.
摘要:
An engine control device for a forklift that suppresses an increase in fuel consumption amount and noise by limiting an engine rotation speed when the forklift is driven without the need to increase the engine speed according to the accelerator operation even when the accelerator is depressed hard. Determining means in a controller determines whether all of the following conditions are satisfied: a neutral position of the traveling direction instructing means; a lift raising switch and first, second and third attachment switches are turned off. When all of the above conditions are satisfied, it is determined whether the forklift is driven in any of a plurality of states. An engine control means generates and outputs a control command to obtain the engine speed based on the accelerator pedal depression with the upper limit value of the engine speed set as an upper limit value of the engine speed.
摘要:
An antenna duplexer includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonance and an auxiliary resonance. Attenuation poles caused by the main resonance and the auxiliary resonance are within the low frequency band. This antenna duplexer has a high attenuation characteristic and a high isolation characteristic while maintaining a low insertion loss.
摘要:
A control device of a forklift engine that secures operability by keeping down fuel consumption when the accelerator pedal is floored in an unloaded or lightly loaded state, and once a heavy cargo is loaded, by lifting the cargo at a maximum lifting speed and traveling with maximum travel performance without acceleration problems. At least two maximum torque curves of different magnitudes are set in advance on a torque curve diagram. Then, the weight the cargo loaded on an attachment is measured. A threshold value for selecting at least two maximum torque curves is determined. If the measured weight is less than the threshold value, the maximum torque curve with a smaller maximum torque value is selected. If the measured weight is not less than the threshold value, the maximum torque curve with a larger maximum torque value is selected. The engine is controlled using the selected maximum torque curve.
摘要:
A surface acoustic wave (SAW) device includes a piezoelectric substrate, and on this substrate there are provided comb electrodes for forming an inter digital transducer (IDT), reflector electrodes placed closely along a traveling direction of a surface wave generated by the IDT, and a frame-like short-circuited auxiliary electrode having a width varying depending on its portions. This structure allows to uniform electric charges overall the electrode-surfaces, where the electric charges are generated in a heat treatment applied to the piezoelectric substrate during the manufacturing of the SAW device. Thus even after the device is diced into pieces, this structure can prevent damages of the electrodes or degradation in electrical properties due to an electric discharge generated by accumulated electric charges caused by pyroelectricity of the substrate.
摘要:
A surface acoustic wave filter has a piezoelectric substrate and at least two interdigital transducer electrodes on the piezoelectric substrate, wherein at least one of the interdigital transducer electrodes includes a unidirectional electrode and bidirectional electrode, and the length &lgr;d of a basic cell of the unidirectional electrode is longer than the length &lgr;s of a basic cell of the bidirectional electrode.
摘要:
A SAW resonator disposed with an IDT electrode and reflector electrodes is formed on the surface of a piezoelectric substrate. Three pieces of the SAW resonator form an acoustic coupling by being disposed close to each other, electrode fingers comprising the IDT electrode in the center are all grounded, and IDT electrode fingers are electrically independent on the side to be connected to input-output terminals of the IDT electrodes disposed outside. As a result, three excitation modes having different propagation frequencies are generated which are used to attain a broad band SAW resonator filter. When these three pairs of the IDT electrode are electrically independent, a balanced input-output can be achieved, and excellent out-of-band rejection characteristics can be obtained.
摘要:
The present invention provides a dust core including, as principal components, a pulverized powder of an Fe-based amorphous alloy ribbon; and a Cr-containing Fe-based amorphous alloy atomized spherical powder, and the pulverized powder is in the shape of a thin plate having two principal planes opposing each other, and assuming that a minimum dimension along a plane direction of the principal planes is a grain size, the pulverized powder includes a pulverized powder with a grain size more than twice and not more than six times as large as a thickness of the pulverized powder in a proportion of 80 mass % or more of the whole pulverized powder and includes a pulverized powder with a grain size not more than twice as large as the thickness of the pulverized powder in a portion of 20 mass % or less of the whole pulverized powder.