Abstract: This invention aims to decrease the leakage current of a dielectric barrier discharge lamp, and to prevent generation of the luminance slope between both electrodes. Electrodes 3 and 4 are formed in the outer surface of the dielectric barrier discharge lamp 1, and the high voltage side of the high frequency power sources 5 and 6 is connected to the electrodes 3 and 4, respectively. The low voltage side of the high frequency power sources 5 and 6 is connected to the grounding voltage GND. The output voltage waveform of the high frequency power sources 5 and 6 have different phases each other and inverted polarities each other.

Abstract: A dielectric barrier discharge type low pressure discharge lamp 11 includes dielectric barrier discharge type external electrodes 21, 22 on external ends of a tubular glass lamp vessel 10, electrically conductive material layers 31, 32 on the external surface of the tubular glass lamp vessel, and heat equalizing members 41, 42, which are provided on the electrically conductive material layer. With the constitution, the surface temperature of the external electrodes 21, 22 can be equalized with a local temperature rise avoided, thereby a longer life of the lamp can be assured.

Abstract: A metal halide lamp includes a translucent air tight vessel having a light emitting tube portion with an internal discharge space, and sealing portions formed on both sides. A discharge medium in the discharge space contains at least metal halide and rare gas. A pair of electrodes, one ends of which are sealed at sealing portion and the other end of which are arranged in the discharge space facing each other. The discharge space has a nearly circular shape in a cross section perpendicular to the tube axis and has a structure in which the discharge medium is accumulated between the electrodes. The light emitting tube portion has a wall thickness of a lower portion thinner than that of an upper portion. The metal halide lamp has a high luminous efficiency, a quick rise of light flux and an easy manufacturing ability.

Abstract: An embodiment of a discharge lamp lighting apparatus of the present invention includes a socket inserted with a discharge bulb, a transformer having a coil including a secondary side winding connected at one end to the socket, connected at the other end to a first drive wire, and a primary side winding connected at one end to a second drive wire, connected at the other end to a third drive wire through a discharge gap, a core inserted into the coil, and a resin filled between the core and the primary side winding, the secondary side winding, and a capacitor connected between the second drive wire and the third drive wire, wherein the transformer and the socket are aligned side by side.

Abstract: A lighting device for high-pressure discharge lamp for lighting the high-pressure discharge lamp by lowering or raising a DC voltage applied to an input side by a DC/DC converter circuit, then converting the DC power into an AC power by a DC/AC inverter circuit, supplying the AC power to the high-pressure discharge lamp and lighting the high-pressure discharge lamp, wherein when the polarity of the current of the high-pressure discharge lamp lit by the substantially rectangular wave is inverted, the output voltage of the DC/DC converter circuit is set to 1.5 times or more as large as the voltage at the stable lighting time of the high-pressure discharge lamp.

Abstract: A metal halide discharge lamp with which essentially permits disusing mercury is provided. The metal halide discharge lamp comprises a refractory and transparent hermetic vessel, a pair of electrodes fixed to the hermetic vessel, and a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide, and a rare gas. The first halide is a halide of metal which achieves a desired light emission. The second halide has a relatively high vapor pressure, being at least one halide of metal which is unlikely to emit a visible light compared with the metal of the first halide and acts as a buffer gas.

Abstract: A package for light emitting element including a package main body 1 having a bottom face 7a on which a light emitting element 2 is arranged, and a concave portion 7 which is formed in an inverted truncated cone shape by an inner wall face 7b intersecting with the bottom face 7a with a predetermined angle, and a translucent member 6 filled in the concave portion 7 of the package main body 1, the angle between the inner wall face 7b composing the concave portion 7 and the bottom face 7a is selected within ±15° of the incident critical angle in which a direct light radiated from the light emitting element 2 undergoes total reflection at the interface between the translucent member 6 and air.

Abstract: A metal halide discharge lamp with which essentially permits disusing mercury is provided. The metal halide discharge lamp comprises a refractory and transparent hermetic vessel, a pair of electrodes fixed to the hermetic vessel, and a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide, and a rare gas. The first halide is a halide of metal which achieves a desired light emission. The second halide has a relatively high vapor pressure, being at least one halide of metal which is unlikely to emit a visible light compared with the metal of the first halide and acts as a buffer gas.

Abstract: A lighting device for dielectric barrier discharge lamp according to the embodiment of the present invention includes a pulse number judging circuit 16. The judging circuit 16 is supplied with a dimming control signal LCS designating a dimming ratio of a discharge lamp as an input signals and judges a number of the drive signal pulses per unit time corresponding to the dimming ratio from the dimming control signal LCS. The judging circuit 16 then outputs the result as the pulse number setting signal. The lighting device includes a drive signal generating signal 18, which is supplied with the pulse number setting signal and outputs the drive signal pulse of the prescribed number of pulse per unit time designated by the number of the pulse setting signal. The lighting device further includes an inverter circuit 10, which is supplied with the output of the drive signal generating circuit 18 and generates HF pulse for driving the dielectric barrier discharge type fluorescent lamp.

Abstract: A metal halide lamp includes a translucent air tight vessel 1 having a light emitting tube portion 11, in which a discharge space 13 is formed, and sealing portions 121, 122 formed on both sides of the light emitting tube portion 11. A discharge medium is enclosed in the discharge space 13 containing at least metal halide and rare gas. A pair of electrodes 31, 32, one ends of which are sealed at sealing portion 121, 122 and the other end of which are arranged in the discharge space 13 facing to each other. The discharge space 13 has a nearly circular shape in a cross section perpendicular to the tube axis and has a structure in which the discharge medium 14 is accumulated between the pair of electrodes 31, 32. The light emitting tube portion 11 is so formed as the wall thickness of a lower portion is thinner than that of an upper portion.

Abstract: A metal halide discharge lamp which essentially permits disusing mercury is provided. The metal halide discharge lamp comprises a refractory and transparent hermetic vessel, a pair of electrodes fixed to the hermetic vessel, and a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide, and a rare gas. The first halide is a halide of a metal which achieves a desired light emission. The second halide has a relatively high vapor pressure, being at least one halide of metal which is unlikely to emit a visible light compared with the metal of the first halide and acts as a buffer gas.

Abstract: An organic electroluminescent light emitting device is provided with light emitting characteristics hardly varying with time. The light emitting device includes a non moisture permeable translucent substrate 11, a light emitting laminated body 13 provided on the translucent insulating substrate 11 including an organic EL light emitting layer 16, a first electrode layer 15 laminated thereon, and a second electrode layer 17. The light emitting device further includes a non moisture permeable sealing wall 14, which is provided on the substrate 11 by forming a space covering the light emitting laminated body 13 without striding over the first and second electrode layers 15, 17 of the light emitting laminated body 13, and connecting terminals 23 which are provided by penetrating the sealing wall or the substrate to supply electric power to each electrode layers 15, 17 of the light emitting laminated body 13.

Abstract: A lighting device according to an embodiment of the present invention includes a pair of sockets 22 made of a soft and elastic conductor and arranged facing each other, with which electric power is supplied to EEFL lamps 21. A plurality of lamp inserting holes 220 is provided along the longitudinal direction of the socket 22. External electrodes 214 at the both ends of EEFL lamps 21 are pressed into each of the lamp inserting holes. These sockets 22 are supported and coated by socket holders 23 made of an insulator having higher rigidity than the sockets 22 respectively.

Abstract: An inductor for performing a chopper operation by turning on or off a first switching element MOSFET Q1 and obtaining an increased voltage is arranged on the secondary side of a transformer 112 and on the basis of the turn ratio of the transformer 112, a high voltage at the time of stable lighting can be obtained from a DC power source 111 at a low voltage Vin. Further, when the on-duties of the first and second switching elements MOSFET Q1 and Q2 constituting an inverter circuit are made almost similar, the timings of application of the power to both ends of a lamp 144 can be made similar, so that the life span of the lamp can be improved.

Abstract: In an electric bulb wherein a pair of lead-in wires 14a, 14b for suspending a filament 16 is supported with a space by heating and melting a glass bead 15 made of glass, a concave portions 15a, 15b are formed at the contact portion of an outer surface of the glass bead 15 and the lead-in wires 14a, 14b, so that rising of the molten glass along the lead-in wires is suppressed. Thus, break of filament 16 owing to the generation of glass bead chippings or minute cracks is avoided, thereby providing a electric bulb having high production yield and high reliability.

Abstract: A socket device according to an embodiment of the present invention includes a tubular main body 1 made of an electrically insulating material. The tubular main body 1 provides a lamp-loading hole 12 having an opening at upper end, through which a baseless lamp 6 is inserted. A notch 3 is formed in a wall of the tubular main body 1, which extends downward from the opening of the lamp-loading hole 12 along an axis of the tubular main body 1. A flange portion 2 is provided around the tubular main body 1 at a portion spaced from the lower end of the notch 3. First and second protrusions 41, 42 are provided on both sides of the notch portion 3 on the outer surface of the tubular main body 1.

Abstract: A high-voltage discharge lamp lighting apparatus has a stabilizer which supplies a power voltage used for maintaining the lighting operation to a high-voltage discharge lamp, and an ignitor circuit having an oscillating circuit-for-driving in which a start pulse generates upon starting the lighting operation of the high-voltage discharge lamp, and high-voltage pulse generating transformers which increase a voltage of the start pulse. Further, the high-voltage discharge lamp lighting apparatus includes a cap portion to which the high-voltage discharge lamp is attached and held, including a part of the high-voltage pulse generating transformers of the ignitor circuit, and a socket portion to which the cap portion is attached and is fit, including at least the oscillating circuit-for-driving in the ignitor circuit and a portion of the high-voltage pulse generating transformers except for a part included in the cap portion.

Abstract: A lighting device for dielectric barrier discharge lamp according to the embodiment of the present invention includes a pulse number judging circuit 16. The judging circuit 16 is supplied with a dimming control signal LCS designating a dimming ratio of a discharge lamp as an input signals and judges a number of the drive signal pulses per unit time corresponding to the dimming ratio from the dimming control signal LCS. The judging circuit 16 then outputs the result as the pulse number setting signal. The lighting device includes a drive signal generating signal 18, which is supplied with the pulse number setting signal and outputs the drive signal pulse of the prescribed number of pulse per unit time designated by the number of the pulse setting signal. The lighting device further includes an inverter circuit 10, which is supplied with the output of the drive signal generating circuit 18 and generates HF pulse for driving the dielectric barrier discharge type fluorescent lamp.

Abstract: Disclosed is a metal halide discharge lamp which essentially permits disusing mercury. The metal halide discharge lamp comprises a refractory and transparent hermetic vessel, a pair of electrodes fixed to the hermetic vessel, and a discharge medium sealed in the hermetic vessel and containing a first halide, a second halide and a rare gas, the first halide being a halide of a metal which achieves a desired light emission, the second halide having a relatively high vapor pressure, being at least one halide of a metal which is unlikely to emit a visible light compared with the metal of the first halide, and acting as a buffer gas.

Abstract: A socket device according to an embodiment of the present invention includes a tubular main body 1 made of an electrically insulating material. The tubular main body 1 provides a lamp-loading hole 12 having an opening at upper end, through which a baseless lamp 6 is inserted. A notch 3 is formed in a wall of the tubular main body 1, which extends downward from the opening of the lamp-loading hole 12 along an axis of the tubular main body 1. A flange portion 2 is provided around the tubular main body 1 at a portion spaced from the lower end of the notch 3. First and second protrusions 41, 42 are provided on both sides of the notch portion 3 on the outer surface of the tubular main body 1.