Abstract:
A plurality of control plates is sandwiched between a cathode and a target to control the flow of charged particles such as electrons and ions between the cathode and the target. The cathode includes an elongated filament for generating charged particles such as electrons. A first electrode is positioned behind the filament with a second electrode having a positive potential interdigitated with the first electrode. The first electrode is divided into segments with a negative potential applied to those segments of first electrode where emission is desired from the elongated filament, and in those areas were emission is not desired those segments of the first electrode are switched sufficiently negative to cut off emission from the elongated filament. Each control plate has a plurality of apertures formed therein which are effectively aligned with corresponding apertures on the other control plates. The aligned apertures form beam channels. The control plates have paired conductive electrodes thereon arranged at predetermined coded finger patterns. Voltages are selectively applied to the control plate electrodes by switching circuitry to focus the charged particles through the apertures associated with selective electrodes while simultaneously aborting the passage of charged particles through the apertures associated with the remaining electrodes. In this manner by selective switching control of the control plate a beam, or a plurality of beams, can be directed to a selected portion or portions of the target at the time.
Abstract:
Light sources are provided with enhanced low-frequency (e.g., near infrared) emission. Some disclosed embodiments include a filament and at least one re-radiator element. The filament heats the re-radiator element to a steady-state temperature that is at least one quarter of the filament's absolute temperature. As disclosed herein, the increased surface area provided by the re-radiator element provides enhanced IR radiation from the light source. Patterning or texturing of the surface can further increase the re-radiator element's surface area. Various shapes such as disks, collars, tubes are illustrated and can be combined to customize the spectral emission profile of the light source. Some specific embodiments employ a coating on the bulb as the re-radiator element. The coating can be positioned to occlude light from the filament or to augment light from the filament, depending on the particular application. The various re-radiator elements can be positioned inside or outside the bulb.
Abstract:
A wavelength-tunable light emitting device includes a substrate having an atomic-scale structure formed on a surface thereof, a needle member for locally applying a voltage through a vacuum space or a transparent insulating member to the substrate to cause a tunnel current to flow through the atomic-scale structure, and a variable-voltage power supply capable of varying voltage applied across the gap between the substrate and the needle member. A tunnel current flows from the tip of the needle member to the atomic-scale structure when a predetermined voltage is applied across the gap between the substrate and the needle member, and light is emitted from a local region in which the tunnel current flows. The wavelength of the light varies when the voltage applied across the gap between the substrate and the needle member is varied.
Abstract:
A discharge lamp assembly in which electromagnetic radiation is produced by a gas discharge in an envelope containing a fill. The charge carriers for initiating and sustaining the main discharge are supplied from a plasma created by a pilot discharge in the fill.
Abstract:
Method and device for the production of photons (7), in the ultraviolet wavelength range, comprising the implantation in a solid matrix of inert or respectively matrix-insoluble gas ions, the excitation of the gas imprisoned (2) in the solid matrix, and the emission of said photons (7) by the excited gas, as well as in particular the ionic bombardment of a surface of the solid matrix by low energy ions of at least one gas such as afore-mentioned, and the low energy electronic bombardment (4) of the solid matrix with emission of the photons (7).
Abstract:
The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope (31 having a phosphor coating (37) on its inner surface, enclosing a single electrode (29) including a thermionic cathode (34) for emitting electrons and an integral anode (35) for accelerating the electrons and forming an electron beam, and a fill material, such as mercury, which emits ultraviolet radiation upon excitation. The electrode configuration provides for use of a single power source and minimal number of power leads. In addition, a separate cathode heater filament is not required.