Abstract: A lighting circuit carrying out lighting control of plural discharge lamps in which depressing of ripple current and noise, small-sizing, and low cost are realized. Plural DC-DC converting circuits (3_1, 3_2) for converting direct current input voltage to designated direct current voltage by ON/OFF control of switching elements in a discharge lamp lighting circuit carrying out controlling lighting plural discharge lamps. Control signal from a control circuit 7 is supplied to each switching element constituting each DC-DC converting circuit, and state of conductivity or non-conductivity of each switching element is controlled as non-synchronization.

Abstract: In a discharge-lamp lighting circuit 1, a DC-DC converter circuit 3 for boosting or lowering DC input voltage Vin from a DC power supply 2, a DC-AC converter circuit 4 for converting the output voltage of the DC-DC converter circuit to AC voltage, and a control circuit 9 for controlling the supply of electric power to a discharge lamp 6 are provided. Further, the supply of power to the discharge lamp 6 is decreased in response to the lowering of the DC input voltage when the lowering of the DC input voltage Vin is detected. The supply of power to the discharge lamp 6 is lowered as the ambient temperature rises even though the lowering of the DC input voltage Vin remains unchanged.

Abstract: In a discharge-lamp lighting circuit for turning on a plurality of discharge lamps, starting circuits 8 for supplying starting pulses to the respective discharge lamps are provided. Each starting circuit 8 has transformers T1 and T2 equal in number to the discharge lamps and each of the transformers has a primary and a secondary winding. The discharge lamps 6—1 and 6—2 are connected to the respective secondary windings T1s and T2s. Capacitors C1 and C2 are connected to the respective primary windings T1p and T2p of the transformers and one switch element SW is provided in a circuit including the primary windings and the capacitors. When the accumulated charge in each capacitor is discharged via the primary winding of the transformer as the switch element SW conducts, the starting pulse is generated and supplied to each discharge lamp via the secondary winding of each transformer.

Abstract: A cool cathode tube control circuit for being connected to a lighting device and a plurality of lamp tubes. The cool cathode tube control device includes a regulator control circuit for controlling a lighting device to provide a steady high voltage power source. A lighting control circuit serves for controlling the lighting device so as to drive a plurality of lamp tubes and adjusting the illuminations of the lamp tubes. An abnormality detecting circuit is connected to the lighting device for sensing abnormal signals. A control logic circuit is electrically connected to the regulator control circuit, lighting control circuit and abnormality detecting circuit for receiving and processing input signals from the abnormality detecting circuit so as to generate logic digital signals to be transferred to the regulator control circuit and the lighting control circuit. Thereby, the lighting device is driven so that the plurality of lamp tubes are actuated synchronously and have the same illumination.

Abstract: An electron gun assembly for a CRT includes three cathode electrodes, a control electrode, an electron-stream extractor electrode, a focusing electrode, and an anode electrode. The electron-stream extractor electrode includes first, second, and third holes, each of which allows one of the three streams of the electrons to pass through. The focusing electrode includes a flat portion having fourth, fifth, and sixth holes, each of which allows one of the three streams of the electrons to pass through. The first, second, and third holes are arranged in the in-line direction. Each of the fourth and sixth holes includes a substantially rectangular opening and a substantially semicircular opening connected to each other. One side of the substantially rectangular opening is connected to a straight line segment of the substantially semicircular opening, and the substantially rectangular opening is disposed outside while the substantially semicircular opening is disposed inside.

Abstract: A control circuit assembly installed in a fountain display apparatus for controlling the reproduction of music and the formation of artificial springs and a lighting effect subject to the reproduction of music.

Abstract: A load drive circuit is disclosed, comprising: a MOSFET 24 including a power supply terminal connected to a lamp load 1, and turned ON/OFF to supply a power supply voltage to the lamp load 1 according to a load driving control signal; a strobe circuit 22 turned ON/OFF according to a monitoring control signal of a timing for monitoring a state of a lamp switch 2; a pull-up resistor 25 connected to the strobe circuit 22; and a microcomputer 21 for driving the lamp load 1 by supplying the load driving control signal to the MOSFET 24 to control turning ON/OFF, and monitoring the state of the lamp switch 2 by supplying the monitoring control signal to the strobe circuit 22 to control turning ON/OFF, based on a voltage value by the pull-up resistor 25.

Abstract: An electric bulb structure includes a housing, a base post extended into an inside of the housing from one end of the housing, a shade mounted on an opening of the housing, a first conductive wire and a second conductive wire each extended into the inside of the housing from an outside of the housing and each extended through the base post, a first filament having a first end connected to the first conductive wire, a second filament having a first end connected to the second conductive wire, and a third conductive wire having a first end connected to a second end of the first filament, and a second end connected to a second end of the second filament.

Abstract: A mercury-free high-intensity discharge lamp operating apparatus includes a horizontally operated high-intensity discharge lamp including an arc tube in which a luminous material is enclosed and a pair of electrodes are arranged in the arc tube; a ballast including an alternating current generation means for supplying alternating current to the pair of electrodes; and a magnetic field application means for applying in substantially vertical direction a magnetic field having a component that is substantially perpendicular to a straight line connecting heads of the pair of electrodes; wherein mercury is not included as the luminous material in the arc tube.

Abstract: The present invention provides a luminescent apparatus having a bright, high-quality image. A reflecting surface-including electrode, and an EL element formed of an organic EL layer and a transparent electrode are provided on an insulator. As shown in FIG. 1, an auxiliary electrode 107 formed of a transparent conductive film is connected to the transparent electrode via a conductor. This structure enables a resistance value of the transparent electrode 104 to be substantially lowered, and a uniform voltage to be applied to the organic EL layer.

Abstract: A (vibration) stopper protection circuit of an electronic ballast for fluorescent lamps. The electronic ballast has an inverter to convert a direct current source into a square-wave source, and to provide the square-wave source to multiple lamp tubes. The stopper protection circuit has several harmonic oscillating capacitors, a sampling transformer, a protection signal processing circuit and a stopper circuit. The sampling transformer samples a normal sampling signal and an error sampling signal when the lamp tubes are normal or out of order, respectively. The protection signal processing circuit outputs an error signal while receiving the error signal. While receiving the error signal, the stopper circuit outputs a stop signal to the inverter, so that the inverter stops operating.

Abstract: A light emitting element driver composed of two transistors, one ground resistor, one inductance and a single capacitor is arranged to drive an LED with a supplied voltage as low as about 0.92 V. The transistors include an NPN transistor and a PNP transistor, the base of the PNP transistor being connected to the ground resistor and the base of the NPN transistor being connected to the collector of the PNP transistor, with the capacitor being connected between the base of the PNP transistor and the node connecting the collector of the NPN transistor to the inductance and to the LED.

Abstract: A remote control device includes a signal generating device for supplying signals to a processor device, to actuate the processor device to generate and to output a low signal and a high signal, an initializing device including a transistor coupled to the processor device, a diac coupled to the collector of the transistor, and an oscillating device having two or more transistors coupled between the diac and one or more halogen lamps, for energizing the halogen lamps alternatively. The diac may be actuated with different operating times in order to adjust the brightness of the halogen lamps.

Abstract: In a plasma display panel, data electrodes are formed parallel to each other on a first substrate, and a selection voltage is to be applied to them. A dielectric layer covers a surface of the first substrate to include the data electrodes. Linear partitions are formed at a predetermined interval on the first substrate to be parallel to the data electrodes. A second substrate opposes the first substrate. A closed space between the first and second substrates is filled with a gas. Intersections of a pair of sustain discharge electrodes and data electrodes form matrix-like discharge cells. Stepped partitions are formed at a predetermined interval on the first substrate in a direction intersecting the linear partitions.

Abstract: In a lighting circuit 1A, there are provided a DC power circuit 3′ for outputting DC voltages having positive and negative polarities and a DC-AC converting circuit 4A for converting the output voltages into AC voltages through a plurality of switching elements and for then supplying the AC voltages to a plurality of discharge lamps 6—1 and 6—2. In the case in which each discharge lamp is to be lighted up, a polarity fixing period is set to define the polarity of the voltage to be supplied from the DC-AC converting circuit 3′ to the discharge lamp before and after the discharge lamp is lighted up to be positive or negative. For this period, control is carried out such that a current flowing to the discharge lamp does not exceed a predetermined limit current value.

Abstract: A discharge lamp operating apparatus includes a discharge lamp; a dimmer for performing phase-control with respect to an input power source; and a ballast circuit for dimming and operating the discharge lamp in accordance with an AC voltage that is phase-controlled by the dimmer. A relationship Z2≦(Vin/Vob−1)×Z1; is satisfied, where Z1 (&OHgr;) is an impedance between an input terminal and an output terminal of the dimmer, Vob (V) is a breakover voltage of a bidirectional trigger diode that applies a trigger signal and is connected to a gate terminal of a switching element included in the dimmer, Vin (V) is an effective voltage of a commercial power source, and Z2 (&OHgr;) is an input impedance between the input terminals of the ballast circuit.

Abstract: Two high-pressure discharge lampbanks and transformers thereof are connected via a cross connection manner. The two lamp banks include the same number of high-pressure discharge lamps, and the transformers are in a number corresponding to that of lamps in each lamp bank. All the transformers have two outputs, namely, first and second outputs, at a secondary side thereof. First outputs of all the transformers are separately connected to the lamps in a first one of the two high-pressure discharge lamp banks while second outputs of all the transformers are separately connected to the lamps in a second one of the two high-pressure discharge lamp banks. Thereby, lamps in the same lamp bank are maintained at a voltage having the same phase and have a small potential difference among them to avoid interference noises.

Abstract: The present invention relates to a discharge lamp lighting method and a discharge lamp lighting apparatus that achieve a reduction in the extent of lamp flickering by adopting a relatively simple circuit structure. A power supply unit 1 supplies AC power (Po) to a discharge lamp 3, and a control unit 2 implements control on the power supply unit 1 so as to gradually increase the instantaneous value of the AC power (Po) during a half cycle (&tgr;/2) of an AC pulse current (Io) as the time elapses from the rise of the half cycle (&tgr;/2) toward an end of the half cycle.

Abstract: A bidirectional switch, including a first bidirectional switch between two power terminals of the switch, a low-voltage storage element between a first power terminal and a control terminal of the switch, and a control stage adapted to cause, upon each halfwave beginning of an A.C. supply voltage applied between the power terminals and when the switch is on, the charge of the storage element with a biasing depending on the sign of the halfwave.

Abstract: A device for correcting residual mis-convergence errors in a color cathode ray tube, the tube including a narrow-necked section, located at the rear thereof, in which electron guns mounted therein generate forwardly-directed red, blue and green electronic beams, an outwardly-opening center skirt section, extending forward from the narrow-necked section, and terminating in a wide perimeter surrounding a relatively flat, pixel-coated, viewing screen section that is arranged generally orthogonal to the axis of the narrow-necked section and upon which the electronic beams are directed to strike the pixels to produce color and images for viewing from the front of the tube, and further having at least one pair of electromagnetic coils mounted outside the tube, for initial focusing of the electron beams during their travel from the guns to the screen, the device including a separator made of a plastic, including a high density of magnetizable particles therein, the separator arranged for placement about the outside