Abstract: An apparatus for suppressing noise radiating from an ignition system for an internal combustion engine is disclosed. The ignition system comprises a distributor which uses an electrically conductive ceramic or a PTC (Positive Temperature Coefficient) thermistor as a material for a rotary electrode and/or stationary electrodes. At least a spark discharging portion of the rotary electrode and/or spark discharging portions of the stationary electrodes are formed from the electrically conductive ceramic which has a resistivity ranging from 10.sup.-6 to 10.sup.-2 ohm.multidot.cm or from the PTC thermistor. Cooperating with them are the high resistor spark plug and the high tension resistor cable. The high resistor spark plug herein disclosed uses an elongate monolithic resistor which has a length not shorter than 8 mm and preferrably has a length of 15 mm.

Abstract: In a distributor for internal combustion engine, the rotor electrode is formed of a first electrode of a conductive metal, and a second electrode electrically connected to the first electrode. The second electrode is formed of the mixture of fine particles of resistive and conductive materials. The first electrode is made in contact with the center carbon of the distributor, and the second electrode is opposed to the stationary electrode of the distributor. The minimum length from the discharge end surface of the second electrode to the first connection between the first and second electrodes is selected to be 5 mm or above.

Abstract: A plasma jet ignition plug wherein a film of semiconductor or a semiconductor oxide defines together with a first rod-shaped electrode and a second electrode a plasma cavity.

Abstract: A plasma jet ignition system wherein a plasma jet energy storage system is used in conjunction with a spark energy storage system to provide energy to a plasma jet ignition plug. For the purpose of suppressing noise due to the spark discharge, a spark energy delivery cable takes the form of a high tension resistance cable and a plasma jet energy delivery cable takes the form of a lead including a coil and having a distributed inductance.

Abstract: A distributor for internal combustion engines is disclosed, in which at least the spark discharge portion of the rotor electrode and/or each of the fixed electrodes is made of an alloy containing silicon, thus suppressing the generation of radio noise.

Abstract: An ignition distributor is disclosed which comprises an input terminal, output terminals, a rotor adapted to rotate with rotation of an engine and provided at its one end with a magnet, a first electrode facing the rotor and coupled to the input terminal, a piezo-conductive plate placed on the surface of the first electrode opposite to the rotor, second electrodes formed of magnetic material and connected to the output terminals, respectively, and the second electrodes circumferentially arranged on the piezo-conductive plate. When the rotor rotates to bring the magnet below one of the second electrodes, the one second electrode is attracted to exert a pressure on the piezo-conductive plate so as to render it conductive thereby establishing an electrical connection between the input terminal and the output terminal connected to the one second electrode.

Abstract: A device for electrically connecting a spark plug to a high-voltage cable supplying a high voltage to the spark plug from an ignition coil, comprising a connecting member whose maximum length in the axial direction of the spark plug is selected to be not longer than 25 mm so as to reduce the antenna effect in the area including the connecting member thereby minimizing undesirable radiation of noise which provides radio interference against other electronic units.

Abstract: An electrostatic type car air purifier comprising a high voltage generating portion, in which a number of tandemly connected resistors of high resistance value are inserted in an output circuit of the generating portion so as to suppress irradiation of electromagnetic noise and to thereby prevent electromagnetic interference in a mounted car radio or other car electric equipment.

Abstract: An electronic air cleaner having therein an electrostatic precipitator and an ultraviolet sterilizing lamp is positioned close to an antenna of a radio receiver. A shielding cover lined with a thin metal film covers the lamp to block radiation of the electric noise waves generated by the lamp.

Abstract: An electronic air cleaner having therein an electrostatic precipitator, an ultraviolet lamp, a deodorizing filter and at least one lead wire which extends along the deodorizing filter from an electric power source to a socket of the ultraviolet lamp. A channel-shaped holder receives in the channel thereof a lower section of a frame of the deodorizing filter so as to form in the channel an enclosed space through which the lead wire passes. At least the wall portions bounding the enclosed space are constructed of electrically conductive material and are grounded so that any noise wave emitted from the lead wire positioned within the enclosed space is prevented from leaking out by the shielding function of the conductive wall portions.

Abstract: An electronic air cleaner, having therein an electrostatic precipitator, is positioned close to an antenna of a radio receiver. The grounded plate electrodes of the precipitator are provided with a flat portion which lies between the precipitator proper and the antenna, so that electric noise wave generated by the precipitator and directing toward the antenna is blocked by the flat portion.

Abstract: An ignition distributor for automotive vehicles comprises a shaft, a rotor arm mounted on the shaft for rotation therewith, a stationary center electrode mounted coaxially with the shaft, and a plurality of angularly spaced stationary outer electrodes. A contact member is secured to the rotor arm which extends between the center of the shaft and a point adjacent to the outer electrode and comprises a baseplate secured to the rotor arm and a resistive film secured to the baseplate, the latter being in electrical contact with the center electrode and in radially inwardly spaced from the outer electrode such that a sudden breakdown of air occurs when the outer end of the contact plate is positioned in proximity to the outer electrode generating an electric discharge. The baseplate is composed of a material having lower electrical conductivity than that of the resistive film so that a distributed constant RC transmission path is formed along the passage of the discharge current.