A highly integrated miniature radiometer chip includes a base board with opposing top and bottom etched metal layers to form interconnect and ground pads, and a cavity to provide space for surface mounted parts that are attached to the bottom of a middle board which mounts directly over the top of the base board. The middle board has radio frequency circuits and semiconductor chips at a top metal layer, and surface mounted parts, and ground and signal pads at a bottom metal layer. Metalized vias extending through the dielectric material connect the top and bottom layers. A top cover includes a feedhorn, a waveguide section, and isolation compartments and channels that overlie the RF circuits on the middle board. A dielectric insert is located inside the feedhorn to enhance the feedhorn performance and seal the radiometer chip from external air, humidity and contaminants.

A printed circuit board includes a substrate and wiring provided on a surface of the substrate and including a cured conductive paste. The conductive paste contains metal nanoparticles having an average particle diameter of 30 nm or more and 600 nm or less, metal particles having an average particle diameter larger than that of the metal nanoparticles, a thermosetting resin having an oxirane ring in a molecule, a curing agent, and a cellulose resin. The wiring has a width of 0.3 mm or more and 6 mm or less, a thickness of 10 μm or more and 40 μm or less, and a resistance value of 500 mΩ/m or more and 5000 mΩ/m or less, and a welding strength of the electronic component to the substrate is 30 N or more.

A semiconductor device, including a first board, a second board having a plurality of through holes passing therethrough, and a plurality of external terminals that are respectively press-fitted into the plurality of through holes of the second board, one end portion of each external terminal passing through the corresponding through hole and being fixed to a front surface of the first board. The second board is a printed circuit board that further includes, in a top view thereof, a plurality of support regions, each having one of the plurality of through holes formed therein, and a plurality of buffer regions respectively surrounding the plurality of support regions, each buffer region having at least one buffer hole and at least one torsion portion formed therein, the at least one torsion portion being connected to the support region surrounded by each buffer region.

The present disclosure discloses a technique, which reduces influence of not only environmental temperature but also environmental humidity, thereby preventing shortening of life of each electric element forming a power supply of a mass spectrometric instrument. The disclosure therefore provides a mass spectrometric instrument including: a circuit board on which electric elements are disposed; a gas supply unit; and a mechanism that controls humidity and temperature of gas supplied from the gas supply unit and applies the gas with the humidity and temperature controlled to at least part of the circuit board.

Disclosed is a printed circuit board including an overvoltage controlling element and an electronic device including the same. The printed circuit board includes a first outer layer, a second outer layer, at least one inner layer stacked between the first and second outer layers, an overvoltage controlling element comprising overvoltage controlling circuitry mounted on the first outer layer and including a plurality of terminals of which a first terminal is connected to a ground, and a conductive area configured to transfer at least a part of a first voltage applied from an external power source to an external IC and to transfer a remaining part of the first voltage to the overvoltage controlling element.

A power supply unit for an aerosol inhaler includes: a power supply able to discharge power to a load for generating an aerosol from an aerosol source; a connector able to be electrically connected to an external power supply; and a charger configured to be able to convert power which is input from the connector into charging power for the power supply. The power supply unit further includes a first zener diode which is provided between the connector and the charger so as to be connected in parallel with the charger, and the first zener diode is connected so as to be closer to an input terminal of the charger than to an output terminal of the connector.

A surface mount (SMD) diode taking a runner as the body and a manufacturing method thereof are described. An elongated runner groove is adopted to cure and package groups of diode chips arranged side by side and corresponding copper pins thereon, with the utilization rate of epoxy resin up to 90% or more. The use cost of epoxy resin is thus reduced, and environmental pollution is also reduced.

A power supply unit for an aerosol inhaler includes: a power supply able to discharge a power to a load for generating an aerosol from an aerosol source; a connector able to be electrically connected to an external power supply; and a control device. The power supply unit further includes: a conductor which electrically connects the connector and the control device; a capacitor provided between the connector and the control device so as to be connected in parallel with the control device; a first circuit board on which the connector is provided; a second circuit board which is apart from the first circuit board and on which the capacitor and the control device are provided; and a conductive member which electrically connects the first circuit board and the second circuit board.

A power supply unit for an aerosol inhaler includes: a power supply able to discharge power to a load for generating an aerosol from an aerosol source; a first control device and a second control device which are configured to control at least one of charging and discharging of the power supply; a circuit board on which the first control device and the second control device are provided; a first capacitor which is provided on an input side of the first control device so as to be connected in parallel with the first control device; and a second capacitor which is provided on an input side of the second control device so as to be connected in parallel with the second control device, wherein a capacity of the first capacitor is different from a capacity of the second capacitor.

A power supply unit for an aerosol inhaler includes: a power supply able to discharge power to a load for generating an aerosol from an aerosol source; a connector able to be electrically connected to an external power supply; and a control device configured to control at least one of charging and discharging of the power supply or configured to be able to convert power which is input from the connector into charging power for the power supply. The power supply unit further includes a zener diode which is provided between the connector and the control device so as to be connected in parallel with the control device, and a maximum value of zener voltage of the zener diode is lower than a maximum operation guarantee voltage of the control device.