Abstract:
A flash device for a camera of the kind using a miniature lamp type flash tube solves all the problems resulting from the use of the straight tube type flash tube. The disclosed arrangement of the flash device not only ensures an adequate light distributing characteristic in all the vertical and lateral directions but also permits reduction in size of an electronic flash unit.
Abstract:
A flashbulb wherein short radii curvatures are allowed for a curved plasma channel without overloading the walls, so that a high luminance is obtained. The discharge space (9) between two electrodes (4, 5) is annularly formed. The outside wall (1) forms a closed hollow cylinder of glass. The outside wall (1) forms a closed hollow cylinder of glass. The inside walls (7, 8) are composed of white ceramic material which is hermetically fused to the glass.
Abstract:
A low pressure arc discharge tube having structural means located within the envelope for raising the voltage across the arc tube. The structural means comprises at least one partition extending across the arc tube and having a dimension which is less than the electron energy relaxation distance of the arc discharge tube. Each of the partitions has at least one aperture therein which constricts the arc within the tube.
Abstract:
The invention relates to a low-pressure discharge lamp having a discharge space which is limited by at least two walls (1, 2) which are at some distance from each other, there being present in this discharge space a third, thin-walled member (7) which alternately extends to at least near one wall (1) and the other wall (2), the discharge path being folded. The thin-walled member (7) has end faces, (14), which extend in parallel with the walls 1 and 2 and which are connected thereto in a discharge-tight manner.
Abstract:
A low pressure metal vapor discharge lamp has a double-tube type discharge vessel consisting of a fully closed outer glass bulb and an inner glass tube substantially coaxially disposed in the outer glass bulb, the inner glass tube being closed at its fixed end and opened at its free end. The space within the discharge vessel is filled with a small amount of a metal and a rare gas of a low pressure. A single cathode is disposed within the space inside the inner glass tube, while a plurality of anodes are disposed in the annular space between the inner glass tube and the outer glass bulb. According to the invention, a number of discharge channels corresponding to that of the anodes are formed between the single cathode and respective anodes, via the opening end brim of the inner glass tube. In operation, anode oscillations take place alternately in respective anodes to cause a self-excitation switching operation, so that a plurality of plasmas are formed. Further, in order to avoid flickering of the output light of the lamp, which is attributable to the irregular fluctuation of the plasmas, means are provided for stably fixing the discharge channels to respective constant positions. The means for fixing the discharge channels may be in the form of axial notches formed in the opening end brim of the inner glass tube, corresponding to the anodes, or a partition plate disposed at the opening end of the inner glass tube and adapted to separate the discharge channels from each other.
Abstract:
The envelope of a single-ended fluorescent lamp is provided with an inserted partition assembly that forces the arc discharge to follow a tortuous path which is longer than the envelope, thus reducing the size of the lamp and providing a concentrated light source which is suited for use in lighting fixtures that are designed for incandescent type lamps. The inherent tendency of the arc to bypass the partition is overcome by seating the end of the partition assembly against a soft gasket of porous material (preferably fibrous in structure) that is located at the sealed end of the envelope and constitutes a barrier to the discharge which blocks the direct arc-path between the adjacent electrodes. The porous gasket is part of a diaphragm assembly and, since it is permeable to gases and vapors, it does not interfere with the evacuation of gaseous impurities and water vapor from the envelope when the lamp is being manufactured. Potential arc-leakage paths along the envelope-partition interface are sealed by a filling of phosphor deposited along such regions during lamp manufacture. The porous gasket preferably comprises a pad of felt-like inert material that extends completely across the interior of the envelope, or one which has a central opening and is of annular shape and held in place by a pair of suitable planar members--one of which is seated against a flanged end of the partition assembly. The envelope, partition, diaphragm and electrode components are assembled in a manner which prevents oxidation of the tungsten wire electrodes and also permits the organic binder, solvent constituent, etc. to be removed from the phosphor coatings without contaminating the electrodes.
Abstract:
The invention relates to a mercury amalgam low pressure radiator having a cylindrical piston comprising two ends, and being permeable for UV radiation, wherein one end of the piston holds the electrodes and the other end of the piston is equipped with the amalgam deposit. In this manner a particularly robust radiator having compact dimensions is obtained, especially where installation is in a hung position.
Abstract:
A photon source comprises a plasma source (10) with at least one cathode (11) and at least one anode (12), between which a system of one or more mutually separated cascade plates (13) is placed. The cascade plates are provided with at least one passage opening (15), wherein corresponding passage openings of successive cascade plates He at least substantially mutually in line. The plasma source comprises a gas inlet (21) for admitting a gas to be excited at an inlet pressure. An electric power source (40) is connected between the cathode and the anode. The power source is able and adapted to generate a modulated current The gas inlet is coupled to gas supply means (25,26) which are able and adapted to admit the gas to be excited at a modulated, sub- atmospheric to above-atmospheric inlet pressure.