Abstract: According to one embodiment, a light emitting device includes first and second plate electrodes, a light emitting element and an insulator. The first plate electrode includes first and second major surfaces. The second plate electrode includes third and fourth major surfaces. The light emitting element is placed between the first surface and third major surfaces. The light emitting element includes a semiconductor stacked body having a fifth major surface and a sixth major surface, a first electrode and a second electrode. The semiconductor stacked body includes a light emitting layer. Optical axis is made perpendicular to a side surface of the semiconductor stacked body. The insulator is provided in contact with the first and second plate electrodes and including a window. The light beam is enabled to pass through the window and to be emitted outward.

Abstract: A low-pressure discharge lamp having a tubular glass lamp vessel 10, on an outer surface of which conductor layers are formed as electrodes 21 and 26. The ultrasonic solder dipping layers 31 and 36 are formed at both ends of the vessel 10 as conductor layers. The end surfaces of the glass lamp vessel are blasted and ultrasonic solder dipping layers are formed on the blasted surfaces 41 and 46 by ultrasonic solder dipping. Conductor layers form external electrodes 21 and 26, which are in contact with the glass surface more strongly. A low-pressure discharge lamp having the conductor layers of a uniform thickness can be mass-produced at low cost.

Abstract: A low-pressure discharge lamp having a tubular glass lamp vessel 10, on an outer surface of which conductor layers are formed as electrodes 21 and 26. The ultrasonic solder dipping layers 31 and 36 are formed at both ends of the vessel 10 as conductor layers. The end surfaces of the glass lamp vessel are blasted and ultrasonic solder dipping layers are formed on the blasted surfaces 41 and 46 by ultrasonic solder dipping. Conductor layers form external electrodes 21 and 26, which are in contact with the glass surface more strongly. A low-pressure discharge lamp having the conductor layers of a uniform thickness can be mass-produced at low cost.

Abstract: An illuminating device according to an embodiment of the present invention includes a dielectric barrier discharge type low pressure discharge lamp 1 composed of a tubular glass lamp vessel 10, in which mercury and rare gas are enclosed, a first and a second electrode 21,26, which are made of electrically conductive layer, are provided on an outer surface of both ends of the tubular glass lamp vessel 10 and a high frequency power source of a floating output type 81,82, which supplies a sine wave voltage between the first and the second electrodes of the dielectric barrier discharge type low pressure discharge lamp 1 having a neutral point of the sine wave voltage being grounded, and which supplies a frequency in a range from 40 kHz to 100 kHz.

Abstract: A tubular glass lamp vessel 10 composing a dielectric barrier discharge type low-pressure discharge lamp is provided with electrically conductive layers 31, 36 as electrodes on an outer surface of at least one end of the tubular glass lamp vessel 10. The electrically conductive layers 31, 36 are formed on the surface of the tubular glass lamp vessel 10 by solder material. A metal strip 106 for electric supply is fixed by soldering on the electrically conductive layers 31, 36.

Abstract: An external electrode discharge lamp 11 is provided with dielectric barrier type electrodes 30 and 40 on an outer surface of end portions of a tubular glass vessel 20. An inner wall of the tubular glass vessel of the lamp 11 is covered with a protective layer 70, 90 made of a metal oxide layer, for example, at least at a portion where the electrodes are arranged, so that the inner wall is not exposed to the inside space of the vessel 20. With the feature, a hole is prevented from being formed at a portion of the tubular glass vessel, and a long life lamp can be provided.

Abstract: An illuminating device according to an embodiment of the present invention includes a dielectric barrier discharge type low pressure discharge lamp 1 composed of a tubular glass lamp vessel 10, in which mercury and rare gas are enclosed, a first and a second electrode 21,26, which are made of electrically conductive layer, are provided on an outer surface of both ends of the tubular glass lamp vessel 10 and a high frequency power source of a floating output type 81,82, which supplies a sine wave voltage between the first and the second electrodes of the dielectric barrier discharge type low pressure discharge lamp 1 having a neutral point of the sine wave voltage being grounded, and which supplies a frequency in a range from 40 kHz to 100 kHz.

Abstract: A low-pressure mercury vapor-filled discharge lamp has a glass arc tube and a glass outer tube disposed coaxially with the arc tube forming a space therebetween. A gas is disposed in the space. The arc tube contains a gas and is coated with a phosphor. A first seal hermetically seals the inner tube. A second seal seals the inner tube to the outer tube. The inner tube further contains a pair of cathodes coupled to Dumet wires extending from the interior of the inner tube to the outside of the lamp structure. The pressure in the space is set at not more than 1 Pa, which is nearly high vacuum. The longer the radial dimension of the space, the greater the heat retaining capacity and the better the temperature characteristics which can be obtained. However, by setting the pressure of the space at 1 Pa or less, the optimum heat retaining capacity can be obtained while reducing the diameter of the low-pressure mercury vapor filled discharge lamp 1.

Abstract: A cleaning and drying apparatus comprises a vessel having a closed bottom and a side wall extending upwardly from the circumference of the bottom. The vessel has an inlet for introducing the discrete parts on the bottom of the vessel and an outlet formed in an upper end of the side wall for removing the parts out of the vessel. A spiral track is formed on the interior surface of the side wall to ascend therealong in a spiral manner about a vertical center axis of the vessel from the bottom to the outlet. A liquid line is connected to supply a cleaning liquid into the vessel. An level controller is provided to keep a level of the cleaning liquid in the vessel well below the outlet in such a manner as to divide the length of the spiral track into a drying zone immersed in the cleaning liquid and a drying zone disposed above the level.

Abstract: A cleaning and drying apparatus comprises a vessel having a closed bottom and a side wall extending upwardly from the circumference of the bottom. The vessel has an inlet for introducing the discrete parts on the bottom of the vessel and an outlet formed in an upper end of the side wall for removing the parts out of the vessel. A spiral track is formed on the interior surface of the side wall to ascend therealong in a spiral manner about a vertical center axis of the vessel from the bottom to the outlet. A liquid line is connected to supply a cleaning liquid into the vessel. An level controller is provided to keep a level of the cleaning liquid in the vessel well below the outlet in such a manner as to divide the length of the spiral track into a drying zone immersed in the cleaning liquid and a drying zone disposed above the level.

Abstract: A low pressure gas discharge lamp comprises an elongated tube filled with a discharge gas. An inner electrode is disposed in a first end portion of the tube and an outer electrode is formed on an outer surface of the tube. The outer electrode has a belt shaped portion formed on the outer surface of the tube along an axial direction of the tube between the first end portion and a second end portion of the tube and a ring shaped portion formed on the outer surface of the tube around the second end portion of the tube. The ring shaped portion is connected to the belt shaped portion. The discharge is generated between the inner electrode and the outer electrode. The ring shaped portion of the outer electrode prevents the discharge from shifting from a central axis of the tube, and thus makes the lamp have an even brightness distribution along the axis of the tube.

Abstract: This invention relates to a fluorescent lamp unit which comprises a fluorescent lamp, and fluorescent-lamp mounting members mounted at end portions of the fluorescent lamp and for fixing the fluorescent lamp to other members. Between the fluorescent-lamp mounting members and the end portions of the fluorescent lamp, there are provided elastic means mounted so that the fluorescent-lamp mounting members can rotate by an angle not less than 1.degree. relative to the fluorescent lamp, or elastic means mounted so that the fluorescent-lamp mounting means can deflect by not less than 0.1 mm in a longitudinal direction of the fluorescent lamp. The elastic means may be layers of an adhesive. The fluorescent-lamp mounting members may also include screwing means.

Abstract: A low pressure gas discharge lamp includes a bulb with a pair of closed ends, and a pair of bases attached to the ends of the bulb, respectively. Each base has a cylindrical base body into which the end of bulb is inserted, and a pair of receiving terminals electrically connected to an electrode in the bulb and protruding from the base body in a direction perpendicular to the axis of the bulb. Each terminal has a pair of mutually parallel flat faces and is secured to the base body such that these flat faces are located on planes perpendicular to the axis of the bulb, and a part of at least one flat face is in contact with a bottom wall of the base body.

Abstract: A low-pressure discharge lamp includes a bulb and a pair of bases attached to the end portions of the bulb, respectively. Each base has a base body fixed to the end of the bulb and a pair of terminals attached to the periphery of the base body. The terminals have contact portions which project from the periphery of the base body and include contact surfaces extending parallel to the axis of the bulb and facing the same direction. The contact surfaces are located so as to contact a common plane.

Abstract: A rare-gas arc lamp includes a pair of coil filaments disposed at the opposite ends of an elongated bulb for increasing an area of a positive column produced between the coil filament pair in a direction perpendicular to the elongated axis of the bulb, and a rare-gas mainly including xenon gas and having substantially no mercury therein sealed in the bulb at a prescribed pressure selected from the range between 20 Torr and 200 Torr. The combination of the coil filament pair and the xenon gas sealed in the bulb at a prescribed pressure in the range of 20 Torr to 200 Torr may reduce visible changes in a luminance distribution of the lamp when the positive column fluctuates during the operation of the lamp.

Abstract: A fluorescent lamp includes a bulb defining a discharge channel, and a pair of discharge electrodes provided at both ends of the bulb. Each electrode has a pair of leads, a filament mounted between the leads, and rod-like auxiliary electrodes protruding from the leads, respectively. Each auxiliary electrode extends beyond the filament in the electron discharge direction of the discharge electrodes. Each auxiliary electrode is constructed so as to satisfy the following equation Q/I.sub.L .gtoreq.1.0.times.10.sup.-2, where Q is heat capacity of the auxiliary electrode and I.sub.L is lamp current.