Abstract:
A starting circuit for an electrodeless HID lamp includes a visible light radiator for illuminating a gas probe starter during lamp starting. In one embodiment, a light emitting diode (LED) illuminates the gas probe starter via a quartz tube. Excitation is provided to the LED by the same source used to excite the gas probe starter.
Abstract:
The electrodeless low-pressure discharge lamp has a lamp vessel (1) having a cavity (2) at an end portion (3) thereof. An electric coil (4) surrounding a plastic sleeve (5), wherein a liquid-filled tubular container (7) surrounded by a soft-magnetic core (6) is present, is accommodated in the cavity (2). The plastic sleeve (5) is substantially filled up with an elastic polymer. Additionally, the tube (5) may be enveloped by an elastic polymer (9). The elastic polymer ensures a relatively low operating temperature of the members inside the cavity (4).
Abstract:
The electrodeless low-pressure discharge lamp comprises a tube which is closed at one end, which surrounds a body of soft magnetic material with clearance, and which is enclosed with clearance in the cavity in the outer bulb, which cavity enters the cavity in the discharge vessel. The tube provides a good insulation of the body from the heat of the discharge in the discharge vessel.
Abstract:
An electrodeless low-pressure discharge lamp has a tube of synthetic material in a cavity in the discharge vessel, which tube surrounds a core of magnetic material and is itself surrounded by an electric coil. The tube is bipartite, extends to outside the cavity, and has a flange which is fastened to a mounting plate and is coupled to the discharge vessel. A heatpipe extending inside the tube has a second flange clamped between the flange of the tube and the mounting plate.
Abstract:
The electrodeless low-pressure discharge lamp has a lamp vessel (1) with a protuberance (2), in which an electrical coil (4) is situated around a soft magnetic body (3). A heat-resistant envelope (5) separates the coil (4) from the body (3).
Abstract:
A single starting electrode is provided for an electrodeless high-intensity-discharge lamp arc of the type having an arc tube situated within the bore of an excitation coil and in the interior of which arc tube is to be provided a plasma arc discharge driven by the excitation coil. The starting electrode is a conductive conical spiral having a narrower end disposed adjacent to one of the arc tube surfaces. A high voltage is formed by induction, as the spiral electrode receives an RF magnetic flux, to cause an electric field to be produced sufficient to create a glow discharge in the arc tube, and cause a rapid transition to a high-current solenoidal discharge to form the discharge plasma responsive to the normal field provided by the excitation coil.
Abstract:
An envelope, containing a torus-shaped arc of a high-intensity-discharge electrodeless arc lamp has a shape, in a vertical plane, with a sidewall formed of a truncated conical portion, with apex located in a downward position with respect to the cone portion utilized. The upper and lower enclosing surfaces are of convex form and are smoothly joined to the truncated conical side wall of the envelope. In one presently preferred embodiment, the sidewall has a dual truncated conical form, with each truncated cone section having an apex located outside of the arc envelope and with the larger diameter section ends joined together, to allow the lamp to operate either with a base-down or a base-up disposition.
Abstract:
High pressure xenon is used as a buffer gas in an electrodeless sodium iodide arc lamp. Very high efficacies are achieved by using an arc tube with rounded edges and by surrounding a portion of the arc tube with quartz wool. The arc tube may also contain small amounts of mercury iodide.
Abstract:
Electrodeless gas discharge lamp having a lamp vessel which is closed in a vacuum-tight manner, the lamp comprising a rod-shaped core of a magnetic material, a member of a heat-conducting material (for example copper) extending at or near the axis of the core, heat generated in the core during operation of the lamp being discharged to the environment of the lamp by the member.
Abstract:
An electrodeless gas discharge lamp having a closed loop core of a magnetic material the part of which core extends through the lamp vessel, a high frequency field being induceable in this core by means of an h.f. generator in the lamp base, said core is assembled of at least two operable core portions at least a major part of one portion lying within the lamp vessel, and the other of the two portions being located in the lamp base, the lamp base being detachably secured to the lamp vessel.