Abstract:
The present invention relates to a bulb for the electrodes discharge lamp, which, for the purpose of completely blocking the diffusion of heat caused by the convection of air from contact with the discharge bulb or other ways of transfer of heat, is equipped with another, external bulb to contain the discharge bulb inside but removed from it by a vacuous space in-between, and has a reflector formed by coating some of the outer surface of the external bulb for condensation or throw-back of light, whereby dispensing with attachment of a separate lamp shade. In the present invention, the discharge bulb to be contained in the above-said external lamp can be in a plural number so that sources of light of high brightness may be provided, and the external lamp also can be structured in plural numbers so that a variety of uses may satisfactorily be made of.
Abstract:
A low-pressure mercury discharge lamp with a lamp vessel having a first lamp vessel portion (La1) with a first electrode (E11) and a first luminescent layer which radiates white light of a first color temperature during lamp operation and a second lamp vessel portion (La2) with a second electrode (E12) and with a second luminescent layer which radiates white light of a second colour temperature different from the first during lamp operation. The first lamp vessel portion and the second lamp vessel portion are interconnected by a connection which allows a filling of mercury and a rare gas in both portions to pass and together enclose a discharge space. The discharge space contains only one further electrode (E13) for both the first and second lamp vessel portions. Circuit I generates a first current through the first lamp vessel portion and a second current through the second lamp vessel portion and circuit II adjusts the ratio between the effective value of the first current and the effective value of the second current. The first current and the second current are high-frequency currents of changing polarity. The color temperature of the light radiated by the lamp can be adjusted over a comparatively wide range, while the lamp is of a simple construction and has a comparatively high luminous efficacy.
Abstract:
A tri-color lamp for use as an element in the optical presentation of information. The lamp includes a sealed envelope having a common envelope member and a plurality (e.g., three) of longitudinally extending leg members. A common electrode is located within the common envelope member and is spacedly located from opposing electrodes located within each of the leg members. A phosphor layer within the sealed envelope subtends at least the major body portion of each of the leg members such that the surface brightness of the phosphor layer as viewed through the end portions of the lamp is greater than the intensity of the external surface brightness of the phosphor layer on the major body portion. In the presentation of color information, each of the leg members is coated with respective phosphors emitting the primary colors red, green and blue.
Abstract:
The invention relates to a high-pressure discharge lamp comprising an outer bulb accommodating a first and a second discharge vessel, these discharge vessels being connected electrically in series. According to the invention, the second discharge vessel is electrically shunted by a bimetal switch which is closed at a temperature of at least 300 K. The lamp thus starts in two steps, which facilitates the starting process and renders it more reliable.
Abstract:
In a low pressure arc discharge light source unit for unipolar or bipolar operation comprising a vacuum-tight glass envelope translucent at at least one side thereof, a rare fill gas and a quantity of mercury therein, a coating of fluorescent phosphor on the inner side of the envelope, and at least two electrodes opposed to each other within the envelope and connected to electrical conductors, the envelope is flat and essentially two-dimensional comprising two planar areas essentially parallel to each other at a small distance. The unit provides for better light output, better radiation efficacy and simpler and less costly manufacture, at the same time being most compact. At least 50% of the radiation of the planar area of the front of the envelope is effective. Means are provided allowing a single cathode to cooperate with a multiplicity of anodes in e.g., a pixel.
Abstract:
A colored fluorescent lamp assembly wherein a plurality of lamp tubes each coated on the inner surface with each of different coloring fluorescent substances and gas-tightly closed at one end having an electrode communicate their interior at the other open end with the interior of a gas-tight cell having a common electrode, and a single lighting control means controllably causes discharge lightings between the common electrode and the respective electrodes in the lamp tubes, for variably colored light emissions with a compact outline.
Abstract:
A tricolor fluorescent lamp operating on a DC power source is disclosed herein. The lamp comprises an outer envelop defining therein a sealed space in which an ionizable medium is filled at low pressure. Disposed within said outer envelop are three tubular envelops of a generally inverted U-shaped configuration which define correspondingly three separate discharge paths and which are coated with respective fluorescent substances emitting different colors. Three sequentially energized anodes are located within the sealed ends of the respective envelops and a common cathode is disposed in adjacently facing relation with the open ends of the envelops, such that the three envelops can be sequentially energized to emit the specific colors which are additively mixed in various proportions to produce a desired color as emitting from the whole lamp. Said U-shaped configuration of the tubular envelops emitting different colors results in the elongated discharge paths or increased light emitting surfaces within a limited space, providing a compact arrangement of the tricolor lamp to be well suitable for decorative illumination. Also, the bent portions of the U-shaped envelops are cooperative to provide a viewing surface on which all three color emitting sources can appear, which renders the tricolor lamp to be well adaptable for use as a picture element in a color display. Further, the sequential shifting of the discharge paths allows the common cathode to be constantly energized, preventing irregular color reproduction which would otherwise result from the interruption in energizing the cathode during the course of changing the colors to be emitted from the lamp.