Abstract: An electronic device includes the memory card connector including a loading opening for the memory card in the side face thereof and has a first sidewall and a second sidewall facing each other, the printed wire board on which a ground is formed, and a resin case having an opening portion, through which the memory card is inserted and formed in the sidewall of the loading opening. On the second main face of the printed wire board, there are formed a first electrode and a second electrode that are connected with the ground, that are disposed on the respective ends thereof at the loading opening side, and that are independent from each other, and the first electrode is disposed below the first sidewall of the memory card connector and the second electrode is disposed below the second sidewall of the memory card connector.

Abstract: An electronic device comprises a plurality of printed circuit boards having signal GNDs, a metal bar which electrically connects to the respective signal GNDs of the plurality of printed circuit boards, and a card basket which houses the plurality of printed circuit boards and the metal bar and serves as a frame GND. The electronic device also comprises a dielectric between the card basket and the metal bar. The metal bar, the card basket, and the dielectric constitute a noise control capacitor having specific frequency characteristics. By the specific frequency characteristics, the noise control capacitor releases electromagnetic noise occurring in the respective signal GNDs to an outside and shields external noise generated outside.

Abstract: When static electrical charge by electromagnetic waves is applied to a test-target board or test noises are applied to the ground of the test-target board, a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board, and a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board together with the number of conductions.

Abstract: An electronic device includes the memory card connector including a loading opening for the memory card in the side face thereof and has a first sidewall and a second sidewall facing each other, the printed wire board on which a ground is formed, and a resin case having an opening portion, through which the memory card is inserted and formed in the sidewall of the loading opening. On the second main face of the printed wire board, there are formed a first electrode and a second electrode that are connected with the ground, that are disposed on the respective ends thereof at the loading opening side, and that are independent from each other, and the first electrode is disposed below the first sidewall of the memory card connector and the second electrode is disposed below the second sidewall of the memory card connector.

Abstract: An electronic device comprises a plurality of printed circuit boards having signal GNDs, a metal bar which electrically connects to the respective signal GNDs of the plurality of printed circuit boards, and a card basket which houses the plurality of printed circuit boards and the metal bar and serves as a frame GND. The electronic device also comprises a dielectric between the card basket and the metal bar. The metal bar, the card basket, and the dielectric constitute a noise control capacitor having specific frequency characteristics. By the specific frequency characteristics, the noise control capacitor releases electromagnetic noise occurring in the respective signal GNDs to an outside and shields external noise generated outside.

Abstract: When static electrical charge by electromagnetic waves is applied to a test-target board or test noises are applied to the ground of the test-target board, a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board, and a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board together with the number of conductions.

Abstract: A circuit board that requires electromagnetic shielding is enclosed in a cavity formed between a metal case and a base substrate. A ground plane, which is electrically conductive, is embedded in each of the base substrate and the circuit board. The metal case is electrically connected to the ground planes in both the base substrate and the circuit board.

Abstract: There is provided a control device for a glow plug, capable of controlling the energization of a resistance heater of the glow plug by a resistance control process while attaining good resistance control response under cooling of the heater by fuel injection and combustion gas and thereby stably controlling the amount of heat generated by the heater. The resistance heater includes a resistive heating element having a ratio of electrical resistance R1000 at 1000° C. to electrical resistance R20 at 20° C. of 6 or larger, and the glow plug is mounted with at least part of the resistive heating element being protrudingly located in an engine combustion chamber. Under such a condition, the control device controls energization of the resistance heater in a steady control mode to adjust electrical power supplied to the resistance heater in such a manner as to keep a resistance of the heater within a predetermined range.

Abstract: A circuit board that requires electromagnetic shielding is enclosed in a cavity formed between a metal case and a base substrate. A ground plane, which is electrically conductive, is embedded in each of the base substrate and the circuit board. The metal case is electrically connected to the ground planes in both the base substrate and the circuit board.

Abstract: There is provided a control device for a glow plug, capable of controlling the energization of a resistance heater of the glow plug by a resistance control process while attaining good resistance control response under cooling of the heater by fuel injection and combustion gas and thereby stably controlling the amount of heat generated by the heater. The resistance heater includes a resistive heating element having a ratio of electrical resistance R1000 at 1000° C. to electrical resistance R20 at 20° C. of 6 or larger, and the glow plug is mounted with at least part of the resistive heating element being protrudingly located in an engine combustion chamber. Under such a condition, the control device controls energization of the resistance heater in a steady control mode to adjust electrical power supplied to the resistance heater in such a manner as to keep a resistance of the heater within a predetermined range.

Abstract: A circuit board that requires electromagnetic shielding is enclosed in a cavity formed between a metal case and a base substrate. A ground plane, which is electrically conductive, is embedded in each of the base substrate and the circuit board. The metal case is electrically connected to the ground planes in both the base substrate and the circuit board.

Abstract: A heater includes a metallic shell, a heating element disposed at an end of the metallic shell, and a terminal electrode electrically connected to the heating element. The terminal electrode has a protruded portion protruding from the metallic shell. The protruded portion has a locking engagement section lockingly engageable with a connector for electrically connecting the terminal electrode to an outside for conduction of the heating element. A method of producing such a heater is also provided.

Abstract: A heater is provided which comprises a metallic shell, a heating element disposed at an end of the metallic shell, and a terminal electrode electrically connected to the heating element. The terminal electrode has a protruded portion protruding from the metallic shell. The protruded portion has a locking engagement section lockingly engageable with a connector for electrically connecting the terminal electrode to an outside for conduction of the heating element. A method of producing such a heater is also provided.

Abstract: A glow plug includes an inner pole and a ceramic heating rod disposed in and fixed to an outer shell at uppermost and lowermost pole fixed portions A, C and a heating rod fixed portion D. A ratio of L2/L1 is larger than 2, where L1 is a distance from the lower end of the inner pole to the lower end of the fixed portion C; and L2 is a distance from the lower end of the inner pole to the lower end of the fixed portion A. A ratio of L3/L4 is smaller than 15, wherein L3 is a distance from a middle point between the lower end of the inner pole and the upper end of the heating rod to the lower end of the fixed portion C; and L4 is a distance from the above middle point to the upper end of the fixed portion D.

Abstract: A glow plug includes an inner pole and a ceramic heating rod disposed in and fixed to an outer shell at uppermost and lowermost pole fixed portions A, C and a heating rod fixed portion D. A ratio of L2/L1 is larger than 2, where L1 is a distance from the lower end of the inner pole to the lower end of the fixed portion C; and L2 is a distance from the lower end of the inner pole to the lower end of the fixed portion A. A ratio of L3/L4 is smaller than 15, wherein L3 is a distance from a middle point between the lower end of the inner pole and the upper end of the heating rod to the lower end of the fixed portion C; and L4 is a distance from the above middle point to the upper end of the fixed portion D.

Abstract: A glow plug includes a metallic sleeve 1; a cylindrical metallic shell 2, which holds the metallic sleeve 1; a terminal electrode 3, which is attached into the cylindrical metallic shell 2 while being insulated therefrom; a ceramic heating member 4, which is fitted into the metallic sleeve 1; and a glass coating layer 5. In the glow plug, a portion of an ion detection electrode 411 is exposed at the surface of an insulator 44 of the ceramic heating member 4. The exposed portion is coated with a glass coating layer 5, which is formed in such a manner as to extend all around the insulator 44 of the ceramic heating member 4 and has a thickness of 10-200 &mgr;m and a softening point of not lower than 600° C.

Abstract: A glow plug and method for manufacturing the same. The glow plug includes a metallic sleeve 1; a cylindrical metallic shell 2, which holds the metallic sleeve 1; a terminal electrode 3, which is attached into the cylindrical metallic shell 2 while being insulated therefrom; a ceramic heating member 4, which is fitted into the metallic sleeve 1; and a glass coating layer 5. In the glow plug, a portion of an ion detection electrode 411 is exposed at the surface of an insulator 44 of the ceramic heating member 4. The exposed portion is coated with a glass coating layer 5, which is formed in such a manner as to extend all around the insulator 44 of the ceramic heating member 4 and has a thickness of 10-200 &mgr;m and a softening point of not lower than 600° C.

Abstract: A heater main body (300) obtained by connecting one-side ends (331, 341) of lead-out tungsten wires (33, 34) having a metal deposit (301), e.g., silver, to the ends (321, 322) of a U-shaped heating resistor (32) is embedded in a ceramic powder. The powder containing the heater main body (300) embedded therein is press-molded into a given shape and then sintered by hot pressing to thereby obtain a ceramic heating element (3) in which the other ends (332, 342) of the lead-out wires are exposed on the surface of the resultant sintered body.

Abstract: A self temperature control type glow plug has a metallic shell in which ceramic heater having a glow resistor of a tungsten-based alloy embedded in a silicon nitride ceramic is placed in a manner to extend beyond the front end of the shell. A temperature-regulating resistor of nickel, iron or nickel-iron alloy is embedded within the metallic shell in series with the glow resistor. Each resistor has a positive temperature coefficient (PTC), with the positive temperature coefficient of the glow resistor being smaller than that of the temperature-regulating resistor. The electrical resistance ratio of the temperature regulating resistor to the glow resistor falls within a range of 0.35 to 0.60 at room temperature.