Hitachi Metals, Ltd.

Tooru Abe

Yoshihito Yoshizawa

Shunsuke Arakawa

Shin Nakajima

Toshiyuki Tamakai

Sigeru Jomura

A miniaturized transformer including (a) a planer or rod-shaped magnetic core having a height of 3 mm or less and constituted by a laminate of thin ribbons each having a thickness of 30 .mu.m or less, each thin ribbon being made of a nanocrystalline soft magnetic alloy having a structure at least partly occupied by crystal grains having an average crystal grain size of 100 nm or less, or an amorphous soft magnetic alloy, (b) at least one primary winding provided around the magnetic core, and (c) at least one secondary winding provided around the magnetic core.

Miniaturized transformer and inverter circuit and discharge tube glow

A piezoelectric transformer has a driving section area which is provided with input electrodes at the central portion of a long-plate-shaped piezoelectric element and which is polarized in the direction of the thickness thereof; and power generating section areas which are provided with output electrodes on the ends surfaces in the direction of the length thereof, which are polarized in the opposite directions from each other with the driving section area between them, and which are disposed on both ends of the piezoelectric element. The piezoelectric transformer is excited in the half wavelength mode to obtain an output between the output electrodes and the input electrodes. A ratio L2/L1 of the length L2 of the driving section to the overall length L1 in the direction of the length of the piezoelectric transformer ranges from 0.3 to 0.6.

Piezoelectric transformer and power converting apparatus employing the

A driving device for driving a discharge tube, wherein a pair of electrodes is formed on a piezoelectric transformer, and a voltage, which is periodically inverted, is applied to the electrodes. This design makes it possible to take out high voltage from the piezoelectric transformer due to the piezoelectric effect, ignite a discharge tube, and keep the discharge tube ON. Thus, a smaller and thinner driving device for a discharge tube can be achieved.

Discharge tube driving device and piezoelectric transformer therefor

An active filter circuit including a smoothing filter including a choke coil comprising a magnetic core composed of a nanocrystalline alloy and having a magnetic gap in at least one portion thereof and at least one conductive wire wound around the magnetic core, the nanocrystalline alloy having a composition of 0.1-3 atomic % of at least one element selected from the group consisting of Cu and Au, 1-7 atomic % of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W, 10-17 atomic % of Si, and 4-10 atomic % of B, the balance being substantially Fe and inevitable impurities.

Growing community of inventors

Kumagaya, Japan

Tooru Abe