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Garden City, NY, United States

Patent
TDK Corp | Date: 2015-03-05

A bridgeless power factor improvement converter is configured with input terminals for an AC voltage, output terminals from for a DC output voltage, diodes, first through fourth switches, and coils. A control circuit selectively switches the first through fourth switches according to the AC voltage, a first dead time period (the third switch OFF/the fourth switch ON) in which the first and second switches are in a dead time including a zero-cross point from a positive period to a negative period, and a second dead time period (the third switch ON/the fourth switch OFF) in which the first and second switches are in the dead time including the zero-cross point from the negative period to the positive period. The control circuit maintains the third and fourth switches in the OFF state during a period other than the first and second dead periods.


An electronic component comprises an element body and an outer electrode. The element body has a pair of end faces opposing each other, a pair of main faces opposing each other while extending so as to connect the pair of end faces to each other, and a pair of side faces opposing each other while extending so as to connect the pair of main faces to each other. The outer electrode is formed on the end face side of the element body and covers a portion of the main and side faces adjacent to the end face. At least a surface of an electrode portion of the outer electrode located on the side face side thereof is covered with an insulating layer.


A magnetic head has a magnetic head slider that includes a recording element that generates a recording signal magnetic field, a microwave magnetic field generating element that generates a microwave magnetic field, a terminal electrode, and a first transmission line that interconnects the terminal electrode and the microwave magnetic field generating element. A second transmission line is connected to the terminal electrode, the second transmission line being used to transmit a microwave signal from the outside of the magnetic head slider to the magnetic head slider. A capacitor connected to the first transmission line is provided between the terminal electrode and the microwave magnetic field generating element. Accordingly, in the magnetic head, a microwave signal is efficiently propagated.


Patent
TDK Corp | Date: 2015-04-03

The present invention provides an R-T-B based permanent magnet, comprising: a main phase which is composed of the structure of R


Patent
TDK Corp | Date: 2015-04-03

A magnet powder having a composition composed of R (R consists of R1 and R2, R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, R2 represents at least one rare earth element selected from the group consisting of Ho and Gd). T (T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s)) and B, wherein, the atomic ratio of R2/(R1R2) is 0.05 to 0.1, the ratio of R/T is 0.25 to 0.35, and the magnet powder has an average primary particle size of 45 to 100 nm. The present invention also provides a bond magnet using the magnet powder.

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