Abstract: A ceramic powder that contains, as a main composition, barium titanate powder having a perovskite structure with an average particle size (median size) of 200 nm or smaller as measured by SEM observation, wherein the barium titanate powder is such that the percentage of barium titanate particles having twin defects in the barium titanate powder is 13% or more as measured by TEM observation and that its crystal lattice c/a is 1.0080 or more. The ceramic powder has a wide range of optimum sintering temperatures and thus offers excellent productivity and is particularly useful in the formation of thin dielectric layers of 1 ?m or less.

Abstract: A filter body of a common mode noise filter includes: a non-magnetic body; a first magnetic body and a second magnetic body sandwiching the non-magnetic body; and a first coil conductor and a second coil conductor of planar shape which are embedded in the non-magnetic body and positioned on the first magnetic body side and second magnetic body side in the non-magnetic body in a manner facing each other in a non-contact state; and also has a non-magnetic first protective part and second protective part which are made of a non-magnetic material whose strength is higher than the first magnetic body and second magnetic body and which are positioned on the outermost side of the filter body in a manner sandwiching the first magnetic body and second magnetic body.

Abstract: There is proposed an optical disk recording method that can prevent degradation of recording quality due to occurrence of thermal interference, and an optical disk recording reproduction device used in this recording method.

Abstract: One object is to facilitate maintenance of an inspection apparatus for an optical recording disk. In accordance with one aspect, the present method includes: determining whether an inspection apparatus for inspecting recording conditions of an optical recording disk can be further used based on a divergence index correlated to divergence from a state where the inspection apparatus is calibrated or on a difference between the divergence index and a reference value of the divergence index; and, if it is determined that the inspection apparatus can be further used, setting authorization for inspecting the optical recording disk by the inspection apparatus. This method enables inspection of optical recording disks with ensured inspection performance of the inspection apparatus.

Abstract: An acoustic wave device includes: a piezoelectric film made of an aluminum nitride film containing a divalent element and a tetravalent element, or a divalent element and a pentavalent element; and an electrode that excites an acoustic wave propagating through the piezoelectric film.

Abstract: Provided is a substrate with a built-in electronic component that can minimize occurrence of functional anomaly, damage, or the like in a filter function section of an elastic wave filter that is caused by a deformation of a hollow cover of the elastic wave filter that is built into the substrate. The substrate with a built-in electronic component includes: an SAW filter built into a substrate, a filter function section of the SAW filter being covered by a hollow cover; and a stress absorbing layer that faces the hollow cover of the SAW filter through an insulating layer in the substrate.

Abstract: Provided is a high-frequency circuit module that has high mounting density. In a high-frequency circuit module 100, an RFIC 160 that performs transmission and reception processes for high-frequency signals, a power amplifier IC 155 that amplifies a transmission signal from the RFIC, and a duplexer 110 that separates a transmission signal outputted from the power amplifier IC 155 to an antenna and a reception signal that is inputted from the antenna to the RFIC 160 are formed on the top surface thereof. The duplexer 110 is disposed between the RFIC 160 and the power amplifier IC 155.

Abstract: Provided is an electrochemical device compatible with high-temperature reflow soldering using a lead-free solder. An electrical double layer capacitor 10-1 includes a package 14 that is constructed with a film or films and has sealed parts 14a1 to 14a3 formed by sealing parts, in which films are superimposed on each other, by, for example, heat sealing. The entireties of the sealed parts 14a1 to 14a3 of the package 14 are covered in a close-contact state with a support 16 that has higher rigidity than the film(s) constructing the package 14.

Abstract: With regard to EMC problems resulting from interference electromagnetic wave emitted from a subject electronic device, a source of interference electromagnetic wave is accurately located by measuring near-field electromagnetic wave emitted from the subject electronic device. The waveform of an electromagnetic wave received by an antenna under interference is compared with the waveform of an electromagnetic wave detected by a sensor, which moves across a vicinity of the subject electronic device, and when the temporal changes in amplitudes of these waveforms coincide with each other, or when a phase difference between the signals is found fairly constant over time, the position of the sensor at which such condition is found and/or the vicinity thereof is identified as the location of a source of the interference electromagnetic wave.

Abstract: A resonator according to the present invention includes a supporting substrate, a piezoelectric layer, a pair of excitation electrodes, and a bonding layer. The piezoelectric layer is made of a piezoelectric material. The pair of excitation electrodes is formed on the upper surface of the piezoelectric layer so as to excite bulk acoustic waves. The bonding layer has a cavity formed therein so as to face the excitation electrode pair through the piezoelectric layer, and the bonding layer bonds the supporting substrate to the lower surface of the piezoelectric layer.

Abstract: A capacitor forming unit includes a dielectric plate, a first conductor film formed on a plate upper surface region other than front and rear end portions, a first insulator film formed on the upper surface front end portion, a second insulator film formed on the upper surface rear end portion, a second conductor film formed on a plate lower surface region other than front and rear end portion, a third insulator film formed on the front end portion lower surface, and a fourth insulator film formed on the lower surface rear end portion. One or more first electrode rods are disposed in through holes, and electrically connected to the first conductor film and electrically insulated from the second conductor film. One or more second electrode rods are disposed in other through holes, and electrically connected to the second conductor film and electrically insulated from the first conductor film.

Abstract: A piezoelectric thin-film resonator includes a substrate, a lower electrode provided on the substrate, a piezoelectric film provided on the lower electrode and an upper electrode that is located opposite the lower electrode across at least a part of the piezoelectric film. A mass load film is provided on the upper electrode. The mass load film includes a plurality of concave or convex patterns in at least a region that faces the lower electrode. The plurality of concave or convex patterns are densely arranged in a central portion of the region and are sparsely arranged in a peripheral portion of the region.

Abstract: A common mode noise filter includes: a first magnetic body and a second magnetic body; a non-magnetic body sandwiched between the first magnetic body and second magnetic body; and a first coil conductor and a second coil conductor of planar shape which are embedded in the non-magnetic body and positioned on the first magnetic body side and second magnetic body side in the non-magnetic body in a manner facing each other in a non-contact state; wherein a first lead conductor that connects one end of the first coil conductor to a first external terminal is embedded in the non-magnetic body 13, while a second lead conductor that connects one end of the second coil conductor to a third external terminal is embedded in the non-magnetic body.

Abstract: A laminated inductor having a laminate structure constituted by magnetic layers and internal conductive wire-forming layers, wherein the magnetic layer is formed by soft magnetic alloy grains, the internal conductive wire-forming layer has an internal conductive wire and a reverse pattern portion around it, and the reverse pattern portion is formed by soft magnetic alloy grains whose constituent elements are of the same types as those of, and whose average grain size is greater than that of, the soft magnetic alloy grains constituting the magnetic layer.

Abstract: Improved equivalent circuits and circuit analysis using the same for a multilayer capacitor are provided. In one aspect, the equivalent series capacitance C and part of the equivalent series resistance R of a basic equivalent circuit for a multilayer chip capacitor are replaced with a capacitance CO, and capacitances Cm and C1 and the resistance Rc1 to take into consideration abnormal characteristics in electromagnetic distribution that occur at the corners and edges of the internal electrodes in the multilayer chip capacitor. In one aspect, additional circuit elements, such as resistances Rp1 and Rp2, the capacitance Cp, the inductances Lm and L1, and the resistance RL1, are provided to take into consideration the skin effects of the internal electrodes within the multilayer chip capacitor, electromagnetic proximity effects, losses and parasitic capacitance of the dielectric material, as well as parasitic inductance of the external electrodes.

Abstract: Visible light data communication with a sufficient transmission speed is performed using a general-purpose and cost-advantageous blue-light-excitation-type white LED without using a blue color filter while preventing the element from being damaged. When transmission data is inputted to a driving waveform generation unit (110) in a transmitter (100), the driving waveform generation unit (110) and a multi-gray scale driving unit (120) generate a multi-gray scale driving signal, which is supplied to the blue-light-excitation-type white LED (140) and allows the blue-light-excitation-type white LED (140) to emit light. A light signal outputted from the blue-light-excitation-type white LED (140) is collected by a lens or the like, is made incident into a PD (210) in a receiver (200), and is converted to a current signal. The current signal is converted into a voltage signal in a trans-impedance amplifier (212).

Abstract: A stacked piezoelectric actuator has a laminate structure including piezoelectric layers and cover parts such that when an external electrode is applied with drive voltage, the piezoelectric layers become distorted and the entire stacked piezoelectric actuator deforms, and at that time, the cover parts become displaced, wherein the distortion difference occurring between the piezoelectric layers and the cover parts reduces, thereby inhibiting the development of cracks. Moreover, the surface area of the active region of the piezoelectric layers is the same as the surface area of the active region of the cover parts, and therefore the loss of the displacement transfer, which is produced by the piezoelectric layers, at the cover parts is reliably reduced.

Abstract: An integrated electronic device includes a substrate, passive components, pads for external connection, and three-dimensional wiring. The passive components includes a multi-stage coil inductor provided on the substrate. The multi-stage coil inductor has a plurality of coils disposed in several layers. Mutually adjacent coil wires are spaced-apart from each other. The three-dimensional wiring includes a first wiring portion which extends on the substrate, a second wiring portion which extends off the substrate but along the substrate, and a third wiring portion connecting with the first wiring portion and the second wiring portion.

Abstract: An object of the present invention is to provide a multi-layer ceramic capacitor that includes a laminated block 4 formed by laminating ceramic dielectric layers 2 and internal electrodes 3 alternately, a pair of cover layers 5 laminated on top and bottom of the laminated block, a ceramic body 6 formed on both side surfaces of the laminated block 4, and a pair of external electrodes 7 electrically connected to the internal electrodes 3 and that can effectively prevent an occurrence of a crack. In the multi-layer ceramic capacitor 1, a silicate crystal made of an oxide including Ba and Si or a silicate crystal made of an oxide including Ti and Si is formed in boundary portions between the laminated block 4 and the ceramic bodies 6.

Abstract: A laminated inductor, which offers high inductance while suppressing increase in direct-current resistance, has a rectangular solid laminate and a pair of terminal electrodes formed only on the bottom face of the laminate, wherein a folded conductor piece is provided on the first magnetic layer in a manner constituting around one turn worth of the windings, with one end placed near the first corner and the other end placed at a position toward the center and away from this one end so as not to overlap with the one end, while one of multiple sets of coil conductor pieces, each set constituting around one turn worth of the windings, is placed on multiple magnetic layers in the laminate.