Fujitsu Corporation

Yoshinori Mesaki

Masayuki Itoh

Masakazu Kishi

Hajime Kubota

Osamu Ishibashi

Takeo Hishinuma

Kenji Nagase

Yoshiaki Hiratsuka

Tomokazu Nakashima

Kai Nojima

Akira Tanaka

Akio Sotokawa

Takahiro Ooi

Hiroshi Kurosawa

Jin Abe

Kazunori Kasuga

Rikizo Nakano

Sadao Miyazaki

Katsumi Takada

Mitsuo Suehiro

Michihiro Takamatsu

Masahiro Ise

Kazumasa Kaiwa

Masahiro Tomatsu

Michiyo Garbe

Yoshihisa Satou

A crystal oscillator includes a crystal resonator; an inverting amplifier configured to be coupled between a pair of excitation electrodes of the crystal resonator; and a control circuit configured to initiate an alarm and raise gain of the inverting amplifier in a case where an index value for representing oscillation amplitude of the crystal resonator in an oscillation state is equal to or lower than a reference value.

Crystal oscillator, crystal resonator controlling method, and crystal resonator controlling device

A method of manufacturing an electronic component includes forming a component body into which elements are built; and a metal plate electrode that is joined to the component body by conductive paste so as to be electrically coupled to the elements, the metal plate electrode exceeding in size a surface of the component body onto which the conductive paste is deposited.

Electronic component and component-embedded substrate

A crystal oscillator device is disclosed. The crystal oscillator device includes: a crystal piece provided in a casing; a pair of excitation electrodes provided on the crystal piece; a light emitting element configured to emit light that is to be reflected by one of the excitation electrodes to generate reflected light; a light receiving element configured to receive the reflected light; and an alarm generator configured to generate an alarm based on a signal upon an index value being less than or equal to a reference value, the signal being generated in the light receiving element, the index value representing an oscillation level of the crystal piece in an oscillating state.

Crystal oscillator device and method of measuring crystal oscillator characteristic

A crystal oscillator device is disclosed. The crystal oscillator device includes: a casing; a crystal piece provided in the casing; a pair of excitation electrodes provided on the crystal piece; a magnetic flux generating member provided on the crystal piece; a coil through which magnetic flux from the magnetic flux generating member passes; and an alarm generator configured to generate an alarm based on a signal whose amplitude is equal to or less than a reference value, the signal being generated in the coil.

A coupling distance y of a plurality of securing elements for coupling two members to construct a casing for accommodating a circuit board having electric components mounted thereon inside space surrounded by a conductor extracted from design data, an overlapping width x of overlap sections provided to the two members for coupling the two members with the plurality of securing elements, the overlap sections contacting to each other, and a wavelength &#x3bb; of electromagnetic noises generated from the electric components, are extracted. Then, a recommended coupling distance Y for the plurality of securing elements to attenuate the electromagnetic noises by a certain attenuation amount is calculated, based on the overlapping width x and the wavelength &#x3bb;, and the coupling distance y is compared with the recommended coupling distance Y. Thereby, verifications of an electromagnetic noise countermeasure can be made reliably without relying on settings by a user.

Non-transitory computer-readable recording medium having electromagnetic noise countermeasure verification program recorded thereon, information processing apparatus, and method of verifying electromagnetic noise countermeasure

A crystal oscillator device is disclosed. The crystal oscillator device includes: a crystal oscillator including a casing, a crystal piece, a pair of excitation electrodes configured to excite a main vibration, and a pair of sub vibration electrodes configured to excite a sub-vibration; and an alarm generator configured to generate an alarm based on a signal whose amplitude is equal to or less than a reference value, the signal being generated in the sub vibration electrodes.

A crystal oscillator device is disclosed. The crystal oscillator device includes a casing; a crystal piece; a pair of excitation electrodes; a transmission antenna electrically coupled to one of the excitation electrodes; a reception antenna configured to receive a radio wave from the transmission antenna; and an alarm generator configured to generate an alarm based on a signal whose amplitude is equal to or less than a reference value, the signal being received by the reception antenna.

An electronic component includes: a component body into which elements are built; and a metal plate electrode that is joined to the component body by conductive paste so as to be electrically coupled to the elements, wherein the metal plate electrode exceeds in size a surface of the component body onto which the conductive paste is deposited.

A crystal oscillator device is disclosed. The crystal oscillator device includes a crystal piece provided in a casing; a pair of excitation electrodes provided for the crystal piece; a coil provided on the crystal piece; a magnetic flux generating member configured to generate magnetic flux passing through the coil; and an alarm generator configured to generate an alarm based on a signal whose amplitude is equal to or less than a reference value, the signal being generated in the coil.

A housing includes a first member that has a first conductor, a second member that has a second conductor and cooperates with the first member to accommodate a circuit board on which an electronic element is mounted, inside a space surrounded by the first conductor and the second conductor, and a plurality of connecting elements that are arranged at a predetermined arrangement interval y to fix the second member to the first member.

Housing and electronic device

An electronic part bonding substrate includes a substrate, an electronic part mounted on the substrate, a first terminal that extends outwardly from the electronic part, a second terminal that extends outwardly from the first terminal, and a third terminal that extends outwardly from the second terminal, wherein the second terminal being a member having a thermal conductivity lower than a thermal conductivity of a member of the first terminal and a member of the third terminal, and the third terminal being partly or entirely bonded to the substrate by soldering or by a conductive bonding agent.

Electronic part bonding substrate

A crystal unit includes: a crystal substrate; and a pair of excitation electrodes formed respectively on both surfaces of the crystal substrate, wherein at least one of the pair of excitation electrodes has a pattern serving as both of an excitation electrode and a coil. An oscillator includes a package and a crystal unit accommodated in the package. The crystal unit includes a crystal substrate, and a pair of excitation electrodes formed respectively on both surfaces of the crystal substrate. At least one of the pair of excitation electrodes has a pattern serving as both of an excitation electrode and a coil. An oscillation circuit is accommodated in the package and electrically connected to the crystal unit.

Crystal unit, oscillator, and method for fabricating the crystal unit

A crystal unit includes a crystal substrate, a pair of excitation electrodes formed respectively on both surfaces of the crystal substrate, and a coil pattern formed around at least one of the pair of excitation electrodes. An oscillator includes a package and a crystal unit accommodated in the package. The crystal unit includes a crystal substrate, a pair of excitation electrodes formed respectively on both surfaces of the crystal substrate, and a coil pattern formed around at least one of the pair of excitation electrodes. An oscillation circuit is accommodated in the package and electrically connected to the crystal unit.

A memory device comprises a memory block including a plurality of cells each including an erase state and a program state, respectively; and a control circuit configured to execute, in response to a program command, program operation of applying a pulse to each cell to charge an electric charge and transferring the cell from the erase state to the program state. The control circuit executes, in response to a diagnostic command, diagnostic operation of applying to a diagnostic target cell the pulse within a range that the diagnostic target cell in the erase state in a memory block including stored data is not shifted to the program state, and checking whether or not a charge speed of the diagnostic target cell is faster than or equal to a charge speed of a slowest-speed cell whose charge speed is the slowest among normal cells.

Memory device, storage apparatus and method for diagnosing slow memory cells

A photoelectric hybrid board includes: a first board on which a circuit is formed; an optical waveguide layer stacked with the first board; a first optical waveguide section formed in a direction of stacking in the first board and the optical waveguide layer; and a concave part formed, from the optical waveguide layer side, in the optical waveguide layer in an intersection part of the optical waveguide layer and the first optical waveguide section.

Growing community of inventors

Yokohama, Japan

Yoshinori Mesaki