Abstract:
The present disclosure provides a device and method for exposing a person to ultraviolet radiation in tanning wavelengths which is emitted from a discharge lamp having a plurality of grooves formed in its outer periphery along a helical path. The discharge lamp includes, inter alia, an elongated vitreous tube, first and second electrode assemblies and a coating on the interior the interior of the tube. The coating is applied on an interior of the tube along the entire length for emitting ultraviolet radiation in tanning wavelengths when a voltage is applied across the first and second electrodes. In a first representative embodiment, the plurality of grooves are interconnected and the helical path is continuous. Alternatively, the plurality of grooves can be axially offset and the helical path can be discontinuous.
Abstract:
An object of the present invention is to provide, without increasing the costs or decreasing the quantity of light, a fluorescent lamp that is less likely to have the bridge and the constituent tubes damaged while being handled and has improved handleability, as well as to provide a manufacturing method therefor. It is arranged so that the distance between the first and second constituent tubes gradually becomes smaller from the base side of the lamp toward the turning portion side of the lamp where the discharge paths turn. It is arranged so that the value of D2/D1 is within a range of 0.05 to 0.70 inclusive, where D1 is the distance between the first and second constituent tubes being measured at the bridge connecting points on the base side, and D2 is the shortest distance between the first and second constituent tubes on the turning portion side.
Abstract:
A ceramic arc tube for a metal halide discharge lamp is described wherein the lower end well of the arc tube has an internal barrier ridge which substantially prevents migration of the metal halide condensate into the central region of the discharge chamber during vertical operation. The use of the ridge reduces fluctuation in the color temperature of vertically operated lamps and improves efficacy.
Abstract:
The present disclosure provides a device and method for exposing a substrate to ultraviolet radiation emitted from a discharge lamp having regions of varying intensity along its length. The discharge lamp includes, inter alia, an elongated vitreous tube, first and second electrode assemblies and a coating on the interior the interior of the tube. The elongated vitreous tube has an outer periphery and axially opposed first and second ends which define an axial length for the tube therebetween. The outer periphery has a plurality of regions defined along said axial length, wherein a first region extends over a predetermined first portion of said axial length and has a helical groove path defining a series of axially spaced apart grooves formed therein. The first region emits ultraviolet radiation having an intensity greater than that emitted from a second region of the outer periphery.
Abstract:
A method for forming a cold spot region on a discharge tube of a discharge lamp is disclosed. In the method, a discharge tube is formed, and a tubular extension is formed on at least one end of the discharge tube. The tubular extension has a smaller diameter than the diameter of the discharge tube end. The tubular extension is formed so that a free end of the tubular extension extends away from the end of the discharge tube. A reduced thickness portion is formed on the tubular extension. The reduced thickness portion is formed as a membrane. A discharge lamp is also disclosed, which comprises a discharge tube with a tubular extension located at an end of the discharge tube. The tubular extension has a smaller diameter than the diameter of the discharge tube end, and the tubular extension comprises a reduced thickness portion. The reduced thickness portion is a membrane, preferably formed of the material of the tubular extension.
Abstract:
Disclosed is a compact self-ballasted fluorescent lamp that includes a phosphor coating provided inside a glass tube bent to have a double-spiral configuration. The arc tube has two spiral parts that are wound around an axis nullAnull, and a turning part joining the two spiral parts. At any cross section of the glass tube, the applied phosphor coating is thicker in the inner surface of the glass tube near the ends of the glass tube in the axis nullAnull direction, than in the inner surface near the turning part.
Abstract:
The present disclosure provides a device and method for exposing a person to ultraviolet radiation in tanning wavelengths which is emitted from a discharge lamp having a plurality of grooves formed in its outer periphery along a helical path. The discharge lamp includes, inter alia, an elongated vitreous tube, first and second electrode assemblies and a coating on the interior the interior of the tube. The coating is applied on an interior of the tube along the entire length for emitting ultraviolet radiation in tanning wavelengths when a voltage is applied across the first and second electrodes. In a first representative embodiment, the plurality of grooves are interconnected and the helical path is continuous. Alternatively, the plurality of grooves can be axially offset and the helical path can be discontinuous.
Abstract:
A high-pressure gas discharge lamp (HID nullhigh intensity dischargenull lamp) is described which is designed in particular so as to be free from mercury and suitable for use in automobile technology. To achieve improved lamp properties, in particular a substantially equal luminous efficacy compared with lamps of the same power and having a gas filling with mercury, as well as a burning voltage which is as high as possible, a geometry is proposed for the discharge space (2) which raises the temperature of the coldest spot in the lamp to such a degree that the light-generating substances can enter the gas phase to a sufficient extent also without mercury, and in particular in combination with the use of a metal halide as a voltage gradient generator.
Abstract:
A high pressure discharge lamp comprises a light-transmissive ceramic discharge vessel having a swollen portion defining a discharge space and a pair of slender cylindrical portions formed in integral with the swollen portion and communicating with the swollen portion at opposite ends of the swollen portion, wherein the inner surface of the boundary portion between the swollen portion and the each slender cylindrical portion defines a discontinuous inflection, and a pair of the electrodes which penetrate the slender cylindrical portions of the light-transmissive ceramic discharge vessel and lie in the swollen portion of the light-transmissive ceramic discharge vessel at their distal ends, lead-conductors connected to the proximal ends of the electrodes, sealed in the light-transmissive ceramic discharge vessel at least at their mid-portions and exposing outside from the light-transmissive ceramic discharge vessel at their proximal ends, and a filling filled in the light-transmissive ceramic discharge vessel.
Abstract:
A high pressure discharge lamp 1A has a light emitting vessel 2A made of a semitransparent ceramic material and having a pair of end portions 2a each with an opening formed in the end portion and a light emitting portion 2a, a pair of discharge electrodes 5, and electrode supporting members 4 each supporting the electrode 5 and fixed to the end portion 2a. The vessel 2A defines an inner space 6 with an ionizable light emitting substance and starter gas filled in the inner space 6. The electrodes 5 are contained in the inner space 6. The light emitting portion 2b has a thicker portion 2g and a thinner portion 2c. The thinner portion 2c has a cross sectional area of not smaller than 35 percent and not larger than 80 percent of that of the thicker portion 2g so that the light emitting portion 2b has a brightness center 9 in the thinner portion 2c.