Abstract: A miniature surface-mount electronic component which can ensure sufficient impact resistance and vibration resistance especially in an application to a severe use environment such as a vehicle-mounted coil, by putting some contrivance into a method for fixing a coil in a molding process and a method for holding a core and terminals. A miniature surface-mount electronic component including a bar-shaped core 2 on which a winding wire 3 is wound, and metal plates 5, with an outer casing 7 made of an insulating resin molded, includes flanges 2b substantially quadrangular in section at both ends of the bar-shaped core 2, and vertical grooves a and b are provided on side surfaces of the flanges 2b of the bar-shaped core 2 as fixing portions for preventing positional displacement occurring when the outer casing 7 is molded.

Abstract: The present invention provides a low-cost current detection device having a magnetic sensor easily placed on a choke coil, wherein assembly and manufacturing costs are reduced and a product is miniaturized. A current detection device including a choke coil for smoothing an input current or an output current and a magnetic sensor 1a built into the choke coil to detect the input current or output current, wherein the choke coil is composed of: a pair of cores 5 provided with an outer magnetic leg 5a constituting a closed magnetic circuit and a center magnetic leg 5b for providing a gap; and an air core coil 6 mounted on the center magnetic leg 5b, and space 6b is provided to a part of winding of the air core coil 6 with the magnetic sensor 1a placed in the gap between the space 6b and the center magnetic leg 5b.

Abstract: A boost-type switching power device which obtains a dc output by connecting a rectifying diode to the output side of an inductance element, connected in series to a main switching element, the device including: a control circuit which controls the operation of the main switching element by using a feedback signal in accordance with the dc output; and a constant-current circuit comprising a plurality of active elements, which are provided between the the rectifying diode and the output terminal; and wherein, when there is an overload on the output side, the operation of the active elements comprising the constant-current circuit controls the control circuit, switching the main switching element off and thereby stopping the boost function, and, in addition, the output is controlled by the constant-current circuit.

Abstract: A triaxial antenna coil prevents wires from snapping, increases productivity, is resilient against dropping, and is suitable for being made small and light. A triaxial antenna coil includes coils, that are wound around three intersecting winding axes, and a flat core having winding grooves in three intersecting axial directions. A base has a terminal element, that is fitted with a plurality of external connectors and terminal connectors of windings. The base is fixed to one face of the core. The coils are wound in respective winding grooves, and their terminals are connected to the terminal connectors of the terminal element.

Abstract: A switching constant-current power device can stabilize current flowing to a load (e.g. a display device comprising an LED, or the like) even when the current is repeatedly interrupted. A voltage current detector is connected to the output side of a power converter and creates a voltage signal in accordance with the output voltage thereof; and a feedback circuit is provided between a controller for driving the power converter and a current detector, which generates a first feedback signal in accordance with the load current. The feedback circuit comprises a signal holding unit, which outputs a second feedback signal that was created by consulting the voltage signal at a given time, the feedback circuit supplying the first feedback signal, output by the current detector, to the controller when load current is flowing, and supplying the second feedback signal, output by the signal holding unit, to the controller when load current is not flowing.

Abstract: A switching power transmission device includes a transformer having primary and secondary windings, and two driving windings, the transformer being connected with an inductance and a capacitor. First and second switch circuits are connected to input power and the transformer so as to switch the current flow in the primary winding to produce a switched output on the secondary winding. A current, flowing through the first switching device, is detected by a current detecting device to control the current flow based on the detected value of the current.

Abstract: Disclosed herein is a switching constant-current power supply which comprises: a switching-system power converter for supplying a predetermined current to a load; a current detector for generating a feedback signal in correspondence with the load current; a controller for driving the power converter in correspondence with the feedback signal; and a feedback circuit, which is provided between the current detector and the controller, and comprises a signal holding unit, the feedback circuit supplying either a first feedback signal, output from the current detector, or a second feedback signal, output from the signal holding unit, to the controller; the size of the second feedback signal being approximately equal to the first feedback signal at a given time.

Abstract: A laminated electronic component comprising: a plurality of parallel first conductive patterns, which are laminated via a magnetic layer to a plurality of parallel second conductive patterns, the first and second conductive patterns being alternately connected to each other via through-holes, thereby forming a spiral coil inside a laminated body, the axis of the spiral coil being parallel to a mount face; wherein the magnetic layer, provided between the plurality of first conductive patterns and the plurality of second conductive patterns, comprises non-magnetic sections which are provided at positions corresponding to ends of the conductive patterns and extend parallel to the axis of the coil, and a method for manufacturing the same.

Abstract: A laminated electronic component in which insulating layers and conductive patterns are stacked to form a filter and a balun within the stacked body to connect the filter and the balun between an unbalanced terminal and a pair of balanced terminals.

Abstract: A surface mounting type coil includes: a coil hiving windings which are wound around a magnetic core having a hole; a cylindrical magnetic body which is provided around the coil; and a plurality of metal plate terminals which leads of the windings are connected to; the metal plate terminals extending along an outer face of the cylindrical magnetic body from a bottom face to a top face thereof, and being secured to the cylindrical magnetic body in such a manner that tips of the metal plate terminals are within the thickness of the cylindrical magnetic body.

Abstract: A switching constant-current power device can stabilize current flowing to a load (e.g. a display device comprising an LED, or the like) even when the current is repeatedly interrupted. A voltage current detector is connected to the output side of a power converter and creates a voltage signal in accordance with the output voltage thereof; and a feedback circuit is provided between a controller for driving the power converter and a current detector, which generates a first feedback signal in accordance with the load current. The feedback circuit comprises a signal holding unit, which outputs a second feedback signal that was created by consulting the voltage signal at a given time, the feedback circuit supplying the first feedback signal, output by the current detector, to the controller when load current is flowing, and supplying the second feedback signal, output by the signal holding unit, to the controller when load current is not flowing.

Abstract: A switching power transmission device includes a transformer having primary and secondary windings, and two driving windings, the transformer being connected with an inductance and a capacitor. First and second switch circuits are connected to input power and the transformer so as to switch the current flow in the primary winding to produce a switched output on the secondary winding. A current, flowing through the first switching device, is detected by a current detecting device to control the current flow based on the detected value of the current.

Abstract: Disclosed herein is a switching constant-current power supply which comprises: a switching-system power converter for supplying a predetermined current to a load; a current detector for generating a feedback signal in correspondence with the load current; a controller for driving the power converter in correspondence with the feedback signal; and a feedback circuit, which is provided between the current detector and the controller, and comprises a signal holding unit, the feedback circuit supplying either a first feedback signal, output from the current detector, or a second feedback signal, output from the signal holding unit, to the controller; the size of the second feedback signal being approximately equal to the first feedback signal at a given time.

Abstract: Conventional single-piece molded-type inductors are made by pressure-molding magnetic particles of ferroalloy, and have a problem that their insulation resistance drops sharply when placed in a high-temperature environment. Complex magnetic powder is obtained by mixing ferrous crystalline alloy magnetic powder with ferrous amorphous alloy magnetic powder, a connecting agent of 1 wt % to 10 wt % of the mixed magnetic powder being additionally mixed therein, producing a complex magnetic material for use in electronic components. Furthermore, a core is pressure-molded from the complex magnetic material, and a coil is buried in the core to obtain a magnetic element, such as an inductor.

Abstract: A laminated electronic component comprising: a plurality of parallel first conductive patterns, which are laminated via a magnetic layer to a plurality of parallel second conductive patterns, the first and second conductive patterns being alternately connected to each other via through-holes, thereby forming a spiral coil inside a laminated body, the axis of the spiral coil being parallel to a mount face; wherein the magnetic layer, provided between the plurality of first conductive patterns and the plurality of second conductive patterns, comprises non-magnetic sections which are provided at positions corresponding to ends of the conductive patterns and extend parallel to the axis of the coil, and a method for manufacturing the same.

Abstract: A surface mounting type coil includes: a coil hiving windings which are wound around a magnetic core having a hole; a cylindrical magnetic body which is provided around the coil; and a plurality of metal plate terminals which leads of the windings are connected to; the metal plate terminals extending along an outer face of the cylindrical magnetic body from a bottom face to a top face thereof, and being secured to the cylindrical magnetic body in such a manner that tips of the metal plate terminals are within the thickness of the cylindrical magnetic body.

Abstract: A backlight device obtains white light by mixing and synthesizing the three primary colors, the white light appearing as bright to the human eye as conventional white light; in addition, the backlight device is highly economical, in that it reduces power consumption by reducing the effective power input to the light-emitting diodes, and lengthens the lives of the light-emitting diodes.

Abstract: A method for manufacturing a laminated electronic component, in which magnetic layers and conductive patterns for coil are sequentially provided, a coil pattern is enclosed between the magnetic layers inside a laminated body, and a nonmagnetic section is provided between adjacent conductive patterns for coil, the coil pattern being provided by repeatedly performing: a first step of providing a second magnetic layer over the entire top face of a first magnetic layer, which a first conductive pattern for coil is provided on; a second step of providing a loop-shaped groove in the second magnetic layer by using laser processing; a third step of providing a nonmagnetic section in one portion of the loop-shaped groove; and a fourth step of printing a second conductive pattern for coil so that one end section thereof overlaps the end section of the first conductive pattern for coil and the other end section extends to the surface of the nonmagnetic section.

Abstract: A boost-type switching power device which obtains a dc output by connecting a rectifying diode to the output side of an inductance element, connected in series to a main switching element, the device including: a control circuit which controls the operation of the main switching element by using a feedback signal in accordance with the dc output; and a constant-current circuit comprising a plurality of active elements, which are provided between the the rectifying diode and the output terminal; and wherein, when there is an overload on the output side, the operation of the active elements comprising the constant-current circuit controls the control circuit, switching the main switching element off and thereby stopping the boost function, and, in addition, the output is controlled by the constant-current circuit.

Abstract: A laminated chip component including: alternately laminated conductive patterns (13,43,63) and insulating sheets (11,41,61); through-holes (12,42,62) which are provided in the insulating sheets and connect top layer conductive patterns to bottom layer conductive patterns; auxiliary conductive patterns (15,45,65) which are provided on the top faces of the conductive patterns at positions facing the through-holes provided in adjacent insulating sheets; and conductors (14,64) which are provided in the through-holes. The auxiliary conductive patterns can be substituted by conductor sections (16,66) which are provided in the insulating sheets at the positions facing the through-holes provided in adjacent insulating sheets. And, a method for manufacturing a laminated chip component is also disclosed.