Abstract:
A dielectric barrier discharge lamp comprises a discharge vessel that has a principal axis, the discharge vessel encloses a discharge volume filled with a discharge gas. The discharge vessel further comprises end portions intersected by the principal axis. There are at least one electrode of a first type and at least one electrode of a second type in the lamp. The electrodes of one type are energized to act as a cathode and the electrodes of other type are energized to act as an anode. The electrodes are substantially straight, elongated and have a longitudinal axis substantially parallel to the principal axis of the discharge vessel. These electrodes are positioned within the discharge volume. The electrodes of at least one type are isolated from the discharge volume by a dielectric layer. A dielectric barrier discharge lamp is also disclosed, in which the electrodes are arranged within the discharge volume in groups, and each of the groups comprises one electrode of the first type and at least one electrode of the second type.
Abstract:
A lamp bracket structure for cold cathode lamps includes an anchor dock and a line coupling means. The anchor dock includes a cap, a bottom seat and a connecting section for connecting the cap to the bottom seat and allowing the cap to be moved relative to the bottom seat for opening and closing. The line coupling means is located between the cap and the bottom seat. When the cap is closed, the line coupling means clamps the power cord of a cold cathode lamp, and the line coupling means and the power supply end form electric connection. Thus the circuit of the power cord of the cold cathode lamp and the power supply end may be connected or separated rapidly.
Abstract:
A multiple element lamp includes an enclosure mounted on a base with a plurality of lighting elements mounted independently within the enclosure. The lighting elements are electrically connected to a control circuit in the base which selectively supplies power to the individual lighting elements. The control circuit will disconnect a lighting element upon the detection of a decrease in lighting efficiency of the element, and turn on another of the plurality of elements.
Abstract:
A flat planar fluorescent lamp having barrier structures overlaying the electrodes is described. The barrier structures include barrier walls and platforms between the electrodes and the lamp cover with passageways between the platforms and the lamp cover. The barrier structures cause the electric discharge between the lamp electrodes to pass between the platforms and the lamp cover. The interior of the lamp and the top of the platform are coated with a fluorescent material such that the lamp produces light throughout its interior, including the region directly above the electrode, thereby providing a source of light in an area which would otherwise be a dark region surrounding the electrode. In one embodiment, a cold electrode, a hot electrode, an ion barrier, and a tubulation are formed in a glass seal as a single unit, placing the terminals of the electrodes and the tipped-off tubulation in a small region of the lamp to permit easier access and alignment. Two tubulations are used to permit the lamp to be pumped at locations adjacent the two electrodes to reduce problems associated with free ions in the region around the electrode. In one embodiment, a metal lamp body having an insulative coating and including an integral barrier structure is formed using conventional metal stamping techniques. In another embodiment, the lamp body is formed from glass which is shaped according to known techniques to form an integral barrier wall. The platform is then attached to the integral barrier wall and supported at its sides by ledges formed in the sidewall and channel wall of the lamp.
Abstract:
A flat planar fluorescent lamp having barrier structures overlaying the electrodes is described. The barrier structures include barrier walls and platforms between the electrodes and the lamp cover with passageways between the platforms and the lamp cover. The barrier structures cause the electric discharge between the lamp electrodes to pass between the platforms and the lamp cover. The interior of the lamp and the top of the platform are coated with a fluorescent material such that the lamp produces light throughout its interior, including the region directly above the electrode, thereby providing a source of light in an area which would otherwise be a dark region surrounding the electrode. In one embodiment, a cold electrode, a hot electrode, an ion barrier, and a tubulation are formed in a glass seal as a single unit, placing the terminals of the electrodes and the tipped-off tubulation in a small region of the lamp to permit easier access and alignment. Two tubulations are used to permit the lamp to be pumped at locations adjacent the two electrodes to reduce problems associated with free ions in the region around the electrode. In one embodiment, a metal lamp body having an insulative coating and including an integral barrier structure is formed using conventional metal stamping techniques. In another embodiment, the lamp body is formed from glass which is shaped according to known techniques to form an integral barrier wall. The platform is then attached to the integral barrier wall and supported at its sides by ledges formed in the sidewall and channel wall of the lamp.
Abstract:
Discharge apparatus comprises a xenon-filled glass envelope with a common cathode that divides the envelope into two separate gas-containing chambers. Respective anodes are provided in each chamber to cooperate with the common cathode. By placement of the cathode a closer distance to one of the anodes, the impedance of the discharge path between the more closely spaced electrodes is made lower than the impedance of the discharge path in the other chamber. To make the impedance even lower, the pressure of the gas between the closely spaced electrodes is made lower than the gas pressure between the other pair of electrodes. The discharge apparatus is particularly useful in quenchable electronic flash apparatus employing both a flash tube and a low-impedance quench tube.
Abstract:
A new low voltage fluorescent light bulb is described. The bulb operates in a screw type socket on single-phase alternating current. No ballast is required. The lumen output of the new bulb is more than twice that of a filament type light bulb of equal input electrical energy. It has a life expectancy greater than 25,000 hours of useful operation. Hence, besides a substantial savings of electrical energy, the bulb pays for itself over time. Also, this new fluorescent light bulb saves the electrical energy and materials that would be entailed if the filament type of light bulb remains in use over the same extended time period. The new bulb is an ionic gas and mercury vapor discharge device of the uniformly restricted positive column type. However, a plurality of paired and matched self-polarizing positive column discharge tubes are used. The latter as connected, electrically, in a series-parallel manner are using the full wave of the input current; each positive column discharge tube becomes one of unidirectional current flow. It uses only one-half of the input wave, and its other matching and polarized tube takes the other half of the same input wave. This presents one attractive feature, or that of power-factor correction. (Power-factor losses are inherent to all other types of fluorescent lighting devices because of the necessity of the auxilliary ballast equipment.)
Abstract:
The invention relates to a device for operating a low-pressure sodium vapor discharge lamp without a stabilizing ballast.The lamp is provided with a discharge tube having first and second main electrodes opposing a third main electrode. An automatically operating change-over switch occasionally switches the lamp current to either the first or second electrodes. A reservoir of liquid sodium near the first electrode affects sodium vapor pressure in the discharge tube by the switching action.
Abstract:
A bulb-shaped flashtube is provided with a metal envelope to increase its strength and enhance its reliability and operating characteristics. The metal envelope comprises a hollow cylindrical container including an open bottom end and an inwardly extending annular flange at its top end which defines a window opening in the container. A circular base of insulating material is sealed in the open bottom end of the container. A plurality of conductors extend through the insulating base to support a plurality of electrodes within the container. A circular, transparent window is sealed to the annular flange inside the top end of the container for transmitting a flash of light upon electrical discharge between the electrodes.
Abstract:
A high pressure compact arc discharge lamp with an inert gas filling and which is combined with a reflector, includes three co-planar equivalent principal electrodes for multiphase operation. The electrode tips are located to form corners of an isosceles triangle lying within the discharge space of the lamp and are located at the center of curvature of the reflector which projects the discharge space. The upper electrode is vertically oriented and the spacing of the tips from one another is matched to the dimensions of the area to be illuminated (e.g. an image aperture). The discharge currents between the electrodes are directly connected.