Kabushiki Kaisha Toshiba

Other

Tokyo Shibaura Denki Kabushiki Kaisha

Kawatetsu Mining Co., Ltd.

Tetsuhiko Mizoguchi

Toshiro Sato

Koichiro Inomata

Isao Sakai

Hiroshi Tomita

Tetsuo Inoue

Masashi Sahashi

Michio Hasegawa

Atsuhito Sawabe

Yuji Ide

Hiromi Fuke

Toru Higuchi

Tomoharu Tanaka

Akihiko Tsutai

Yuji Iseki

Hiromi Niu

Yasutaka Fukuda

Yoshihito Tachi

Kunio Matsukura

Isamu Yanase

Shigeru Yatabe

Toshirou Sato

Yoshihiko Yamaguchi

Yasunori Iwamoto

Tadahiko Kobayashi

Akio Koyama

Naoyuki Sori

Hideki Yamamiya

This invention provides a surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.

Surface mounting type planar magnetic device and production method thereof

A surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.

Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.

Planar magnetic element

The present invention is directed to a magnetic thin-film device whose operating frequency band ranges from several millihertz (MHz) to several gigahertz (GHz) and which is used as an inductor for a switching power supply, a noise filter, a reception circuit for receiving a quasi-microwave and a magnetic sensor. In this device, uniaxial magnetic anisotropy is guided to a magnetic layer, and the magnetic layer is sandwiched between dielectric layers to form a propagation path of electromagnetic wave. A microstrip line is provided on the top surface of the propagation path, while an insulative underlying substrate is formed on the bottom surface thereof with a lower grounded conductor interposed therebetween. Thus, the wavelength of the propagation path can be shortened to miniaturize the device. The device is rapidly improved in characteristics and miniaturized further, resulting in reduction in manufacturing costs.

Distributed constant element using a magnetic thin film

The present invention provides a magnetic-field sensor using a magnetic substance. In the magnetic-field sensor, a transmission-line element constituted of a conductor layer, dielectric layer and a magnetic layer is inserted in a feedback circuit of a phase-shift type oscillation circuit using an open-loop operational amplifier as an amplifier. An output of the operational amplifier is fed back to an input thereof through the transmission-line element. Thus, a variation in oscillation frequency depending upon the intensity of an external magnetic field is detected as an output of the sensor.

Phase-shift type magnetic-field sensor using a magnetic substance

A planar magnetic device in which the high-frequency loss in the coil conductor can be reduced. The device comprises a planar coil formed of a coil conductor constituted by a plurality of conductor lines. The coil conductor is provided in the form of a spiral. The planar coil is interposed between two insulating layers which are sandwiched between two soft-magnetic layers.

Planar magnetic device

A magnetic thin film is disclosed which has a composition represented substantially by the following chemical formula and, the same time, has the whole or part of the thin film formed of an amorphous region:

Magnetic thin film and thin film magenetic element using the same

A thin film magnetic element is disclosed which uses a soft magnetic thin film having a composition represented by the general formula:

Soft magnetic thin film and thin film magnetic element using the same

A electronic device is disclosed having an underlying conductor formed in a predetermined pattern on a surface of an underlying insulator and made of at least one member selected from the group consisting of Ti, Ta, Mo, Cr, Nb and W and their alloy, a main conductor made of Cu formed in a predetermined pattern on the underlying conductor, a first coating conductor made of at least one member selected from the group consisting of Ti, Ta, Mo, Nb and Ni and their alloy, and a second coating conductor made of at least one member selected from the group consisting of Au and Al and their alloy that are formed in this order so as to coat a surface of the main conductor made of Cu facing the surrounding insulator.

Electronic device and magnetic device

Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.

Magnetic element for power supply and DC-to-DC converter

Magnetic element for power supply and dc-to-dc converter

Growing community of inventors

Yokohama, Japan

Tetsuhiko Mizoguchi