Abstract: A heat dissipating structure of the present disclosure is a heat dissipating structure provided inside a housing, the heat dissipating structure including: a blower that blows air; a heat dissipator including a heat dissipating blow passage through which air from the blower flows; a heat transmitter arranged on the heat dissipator and transferring heat generated by a heat source to the heat dissipator; and a branch blow passage provided between the housing and the heat transmitter and branching from the heat dissipating blow passage. The heat dissipating blow passage includes a branch inlet positioned between the heat transmitter and the blower. The branch blow passage branches from the branch inlet of the heat dissipating blow passage.

Abstract: A battery pack includes: a battery case; a battery that is housed in the battery case and configured of a pouch type cell having a first plane and a second plane disposed on an opposite side of the first plane; and an adhesive layer that is arranged between at least one of the first plane and the second plane of the battery and an inner surface of the battery case in a shape of a frame along an outer edge of the battery.

Abstract: An electronic device of the present disclosure includes: a first housing that includes a first outer surface including a keyboard and includes a second outer surface opposite to the first outer surface; a second housing that houses a display and is connected to the first housing; and a speaker unit disposed inside the first housing. The second outer surface includes a recess. A recess includes a through hole in at least a part of a surface of the recess. At least a part of the speaker unit faces at least a part of a back surface of the surface of the recess including the through hole.

Abstract: An optical waveguide circuit includes: a ring waveguide; an input connection waveguide; an output connection waveguide; and an optical multiplexing/demultiplexing part that optically connects the ring waveguide with the input connection waveguide, and that optically connects the ring waveguide with the output connection waveguide. Further, at least one of the input connection waveguide and the output connection waveguide includes a plurality of curved waveguides, a sum total of products of curvature signs and bending angles of the curved waveguides and a sum total of a curvature sign and a bending angle of the ring waveguide have a same absolute value with signs opposite to each other, and rotation of a polarization plane of light generated in the ring waveguide and rotation of a polarization plane of light generated in the curved waveguides cancel each other out.

Abstract: An electronic device includes a first housing including a display unit, and a second housing that includes an input unit and an antenna unit, is rotatably connected to the first housing via a connection part, and is made of a metal material. The first housing includes a support plate that constitutes a back surface of the first housing, supports the display, and is made of a metal material, and a communication path member that is provided on the support plate and is made of a resin material. The communication path member is disposed in a region facing at least a part of the antenna unit of the second housing in a closed state where the first housing and the second housing are disposed to face each other.

Abstract: An electronic device includes a housing, a covering member that covers the housing, and an attachment part that detachably attaches the covering member to the housing. The attachment part includes a one-side attachment part and at least one other-side attachment part. The one-side attachment part includes a first projection of the covering member extending from a first member toward a second member, a first accommodation part of the housing that accommodates the first projection, and a first movement restriction part that restricts movement of the first projection. The other-side attachment part includes a protrusion of the covering member extending from a second member toward a third surface of the housing, a second projection extending from the protrusion in a direction away from the first member, a second accommodation part of the housing that accommodates the second projection, and a second movement restriction part that restricts movement of the second projection.

Abstract: An electronic device includes a first unit and a second unit including a display device. The first unit includes a housing, a blower device, and an exhaust path. The exhaust path includes a first member, a second member, a third member, and a partition member. The second member faces the second unit positioned at an opened position. The third member faces the first member and extends from an end of the second member far from the first member in a direction away from the first member as the third member is away from the second member. The partition member is disposed at an end close to the second member in a first direction and between the first member and the third member, and extends along the first direction. The second member includes a first exhaust hole. The third member includes a second exhaust hole larger than the first exhaust hole.

Abstract: An electronic device includes a first housing including a display, a second housing including an operation unit, and a rotation unit that rotates the first housing relative to the second housing. The second housing includes a rotation regulation portion that protrudes from a bottom face of the second housing and regulates rotation of the first housing. The rotation regulation portion includes an elastic member configured to rotate back and forth between a first mode and a second mode with different states of protrusion from a bottom face of the second housing, and contactable with the first housing. The rotation regulation portion, in the first mode, regulate rotation of the first housing in a first rotation range, and in the second mode, regulate rotation of the first housing in a second rotation range where the first housing is rotated to a greater extent than in the first rotation range.

Abstract: A power converter includes multiple arms, a temperature detector, a voltage detector, a current detector, a heat generation controller, and a heat resistance estimator. Each of the multiple arms includes a target element being a semiconductor element. The heat resistance estimator determines a heat resistance of the target element based on a temperature difference between a first temperature of the target element and a second temperature of the target element, a current through the target element detected by the current detector, and a voltage across conduction terminals of the target element detected by the voltage detector. The first temperature is a temperature detected by the temperature detector in a state where the heat generation controller has not caused the target element to generate heat. The second temperature is a temperature detected by the temperature detector in a state where the heat generation controller has caused the target element to generate heat.

Abstract: In a transmission circuit, a first pulse signal with a first frequency and a second pulse signal with a second frequency are output according to a rising edge and a falling edge of a first input signal, respectively. When a second input signal indicates an active level, the second pulse signal is output according to the falling edge of the first input signal and the second frequency is changed to a third frequency. In a reception circuit, a first level of a first output signal is changed to a second level according to a first induced signal via a transformer, the second level of the first output signal is changed to the first level according to a second induced signal via the transformer, and a second output signal is changed to an active level when a frequency of the second induced signal has changed to the third frequency.

Abstract: A semiconductor optical device includes: a base configured to intersect with a first direction; a first protrusion configured to protrude from the base in the first direction, the first protrusion including a planar lightwave circuit including: a core layer; and a cladding layer surrounding the core layer; a second protrusion configured to protrude from the base in the first direction and arranged along the first protrusion in a second direction intersecting with the first direction, a height of the second protrusion from the base in the first direction being lower than a height of the first protrusion; an optical semiconductor element placed on a facet of the second protrusion in the first direction and optically connected to the core layer; and a marker provided on the second protrusion in a manner exposed on the facet, the marker being made of a same material as the core layer.

Abstract: A manufacturing method of an optical waveguide device that allows light to propagate through a core formed within a cladding formed on a substrate, the core having a higher refractive index than the cladding, includes: layering a first cladding-material layer for the cladding and a core-material layer for the core sequentially on the substrate; forming the layered core-material layer into the core having a waveguide shape, and removing a first part of the core, the first part being positioned at a portion where a slit is to be formed, to thereby form a gap in the core; layering a second cladding-material layer for the cladding to cover the first cladding-material layer and the core; and removing, by dry-etching, a second part of the first and second cladding-material layers, the second part being positioned at the portion where the slit is to be formed, to thereby form the slit.

Abstract: A management method according to an embodiment is a management method performed by a management server for managing a plurality of communication devices, and includes receiving information indicating at least one of a position or acceleration detected by each of the plurality of communication devices, and managing a position information list including installation position information for each communication device based on the information received. The managing includes, in a case that a collection mode for collecting at least one of the plurality of communication devices is configured, in response to determining that a target communication device for the collection mode has moved, updating the position information list to delete the installation position information corresponding to the target communication device, and in response to determining that the target communication device has been stationary after moving, keeping the position information list without updating the position information list.

Abstract: A circuit for detecting a leakage current in a semiconductor element includes a setting circuit and a detector. The semiconductor element includes a first terminal at a high-potential-side of the semiconductor element, a second terminal at a low-potential-side of the semiconductor element, and a control terminal. The control terminal receives a signal for controlling a conduction state between the first terminal and the second terminal. The setting circuit sets a duration during which a charging current flows to the control terminal as an undetectable duration, in response to turning on the semiconductor element. The detector outputs a detected signal based on a condition that the leakage current flowing from the control terminal to the second terminal, after the undetectable duration has been elapsed.

Abstract: A management method according to an embodiment is a management method performed by a management server for managing a plurality of communication devices, and includes receiving information indicating at least one of a position or acceleration detected by each of the plurality of communication devices, and managing a position information list including installation position information for each communication device based on the information received. The managing includes, in a case that a collection mode for collecting at least one of the plurality of communication devices is configured, in response to determining that a target communication device for the collection mode has moved, updating the position information list to delete the installation position information corresponding to the target communication device, and in response to determining that the target communication device has been stationary after moving, keeping the position information list without updating the position information list.

Abstract: In a transmission circuit, a first pulse signal with a first frequency and a second pulse signal with a second frequency are output according to a rising edge and a falling edge of a first input signal, respectively. When a second input signal indicates an active level, the second pulse signal is output according to the falling edge of the first input signal and the second frequency is changed to a third frequency. In a reception circuit, a first level of a first output signal is changed to a second level according to a first induced signal via a transformer, the second level of the first output signal is changed to the first level according to a second induced signal via the transformer, and a second output signal is changed to an active level when a frequency of the second induced signal has changed to the third frequency.

Abstract: A light polarizing element include: a first port waveguide; two second port waveguides; and a multi-mode interference waveguide optically connected to the first port waveguide and the two second port waveguides, the multi-mode interference waveguide having at least one slit formed therein, the at least one slit having a shape that enables the multi-mode interference wave guide to give different effective refractive indexes to respective mutually orthogonal polarized light waves input from the first port waveguide, thereby separating the mutually orthogonal polarized light waves, and that enables the separated mutually orthogonal polarized light waves to be output from the respective two second port waveguides.

Abstract: An electronic apparatus includes a flexible printed circuit board having a main body on which wiring pattern is formed, a connector having a connection terminal connected to the wiring constituting the wiring pattern, and a base body on which the connection terminal is fixed, and a casing. The main body is attached to the casing to be movable, the flexible printed circuit board has an extension part protruding from the main body and extending along with a ground included in the wiring pattern, the extension part bends in the middle of extending to be capable of expansion and contraction, and has a mounting part fixed to the casing on the tip side thereof, the mounting part is provided with a ground terminal connected to the ground extended, and the ground terminal is electrically connected to the casing in the state that the mounting part is fixed to the casing.

Abstract: A ring-resonator filter device includes: a waveguide device that includes a core. Further, the core constitutes two ring resonator filters, each of the two ring resonator filters includes two arm portions, a ring-shaped portion, and two optical coupling/branching portions that optically couple the two arm portions and the ring-shaped portion, respectively, and the two ring-shaped portions cross each other.

Abstract: An optical waveguide circuit includes: a ring waveguide; an input connection waveguide; an output connection waveguide; and an optical multiplexing/demultiplexing part that optically connects the ring waveguide with the input connection waveguide, and that optically connects the ring waveguide with the output connection waveguide. Further, at least one of the input connection waveguide and the output connection waveguide includes a plurality of curved waveguides, a sum total of products of curvature signs and bending angles of the curved waveguides and a sum total of a curvature sign and a bending angle of the ring waveguide have a same absolute value with signs opposite to each other, and rotation of a polarization plane of light generated in the ring waveguide and rotation of a polarization plane of light generated in the curved waveguides cancel each other out.