Abstract:
A metal vapor discharge lamp includes a discharge tube comprising a translucent ceramic discharge portion that defines a discharge space in which a luminous metal is sealed, slender tube portions provided on both ends of the discharge portion, a pair of electrodes provided with coils at the tips thereof, electrode supports that support the electrodes at one end thereof and extend all the way to the ends of the slender tube portions on the side opposite to the discharge space at the other end thereof, and a sealant for sealing the ends of the slender tube portions on the side opposite to the discharge space so as to attach the electrode supports to the inner surfaces of the slender tube portions, in which X>0.0056P+0.394 is satisfied, where P is a lamp power (W) and X is a distance (mm) from the ends of the coils on the side of the slender tube portions to the ends of the slender tube portions on the side of the discharge space.
Abstract:
The invention relates to a lighting system with a high-pressure discharge lamp and a control unit (W, FS, C1, W) for the high-pressure discharge lamp (1), where the lamp base (10) has at least two housing parts (10a, 10b) which are connected to one another by a releasable closure (22). The first housing part (10a) has fastening means (24) for the at least one lamp vessel (11). The high-voltage part (TR) of the ignition device (TR, FS, C1) is accommodated in the first housing part (10a), whilst the second housing part (10b) is provided with the electrical connections (20) for the high-pressure discharge lamp (1) and preferably contains the remaining components (FS, C1) of the ignition device and the voltage converter (W) of the control unit.
Abstract:
A system for enabling successful use of HID lamps in aircraft, including in particular high power lamps for use as landing lights and taxi lights, utilizes a sealed beam HID lamp which during normal operation has an external temperature considerably lower than the external temperature of a quartz halogen or incandescent sealed beam lamp of equivalent light output. The lower external temperature arises in part from the use of a gas fill in the sealed beam. A detector is provided to monitor the seal integrity of the sealed beam HID lamp and further to provide a response to seal failure resulting in disablement of the lamp. Exemplary means for accomplishing seal failure detection include radioactive detection, pressure monitoring, and chemical sensing, or other means wherein detection of a failed seal is followed by an electrical output used to terminate or preclude lamp operation.
Abstract:
A high brightness discharge light source having improved thermal balance characteristics includes a lamp envelope having an arc chamber formed therein and a pair of electrodes extending into opposite ends of the arc chamber so as to be displaced from one another by a distance of no greater than 4 mm. A fill disposed within the arc chamber is excited to a discharge state upon the introduction of an excitation energy coupled through the pair of electrodes. The light source is operated vertically so that one of the electrodes is disposed at the top region and the other electrode is disposed at the bottom region of the arc chamber. The arc chamber is formed having a diameter dimension which is just larger than the spacing between the electrodes, and a height dimension which is approximately twice the diameter dimension. The diameter dimension is substantially uniform along the length of the arc chamber. The uniform diameter characteristic is effective so that the thermal operating properties associated with the discharge state are substantially equally distributed from the top to the bottom regions of the arc chamber thereby resulting in extending the life of this light source to approximately 6000 hours.
Abstract:
A temperature control system for a source of electromagnetic radiation, such as an arc lamp, in a collecting and condensing system including a first reflector having a first focal point and a first optical axis, and a second reflector having a second focal point and a second optical axis. The source may be located proximate to the first focal point of the first reflector to produce rays of radiation that reflect from the first reflector toward the second reflector and substantially converge at the second focal point. A sensor, such as a voltage or a temperature sensor, may be placed near the source, and produces an output which may be substantially proportional to an attribute of the source. A comparator compares the output to a predetermined value and produces a difference between the output and the predetermined value. A fan placed proximate to the source has an air flow to cool the source which may be substantially proportional to the difference between the output and the predetermined value if the output is greater than the predetermined value. Otherwise, if the output is less than the predetermined value, the air flow may be substantially zero. The temperature control system may also include a heater placed near the source which produces a heat flux. In this case the comparator compares the output to a second predetermined value, producing a second difference between the output and the second predetermined value, and the heat flux may be substantially proportional to the second difference if the output is less than the second predetermined value. Otherwise, if the output is greater than the second predetermined value the heat flux may be substantially zero.
Abstract:
The invention relates to a high-pressure discharge lamp provided with a discharge vessel. The discharge vessel is enveloped with clearance by an outer bulb having a cap. According to the invention, the outer bulb is translucent and substantially tubular in shape.
Abstract:
A system for enabling successful use of HID lamps in aircraft, including in particular high power lamps for use as landing lights and taxi lights, utilizes a sealed beam HID lamp which during normal operation has an external temperature considerably lower than the external temperature of a quartz halogen or incandescent sealed beam lamp of equivalent light output. The lower external temperature arises in part from the use of a gas fill in the sealed beam. A detector is provided to monitor the seal integrity of the sealed beam HID lamp and further to provide a response to seal failure resulting in disablement of the lamp. Exemplary means for accomplishing seal failure detection include radioactive detection, pressure monitoring, and chemical sensing, or other means wherein detection of a failed seal is followed by an electrical output used to terminate or preclude lamp operation.
Abstract:
In a discharge lamp sealing apparatus 30, luminescent substances are charged into an arc tube 11 through an opening 13b thereof, and an electrode member 15 is then inserted into the arc tube 11 through the opening 13b. A lower end of the arc tube 11 is supported by a support jig 57 in a state that a glass ring 16c is placed around the circumference of the opening 13b. The arc tube 11 is set in an air-tight condition by a feeding conduit 51 and inserted into a heating unit 40. The heating unit 40 fuses the glass ring 16c with heat of an infrared lamp and thereby seals the opening 13b. During the sealing process, one end of the arc tube 11 is supported by the support jig 57. The support jig 57 is mainly made of a material having a greater thermal conductivity than that of the material of the arc tube 11, for example, a metal material like Al or Cu. This arrangement enables heat to be readily conducted from the arc tube 11 to the support jig 57 and accordingly prevents a temperature rise in the arc tube 11. This prevents the luminescent substances from being vaporized and released from the arc tube 11.
Abstract:
An optical emitter is provided, in particular for ultraviolet or infrared radiation, with a lamp bulb (1) from which extend at least two connecting wires (4, 5) for electrical connection, in each case through a stem press (2, 3) at the upper end and the lower end of the lamp bulb (1). The first connecting wire (4) is electrically connected with a first contact pin (15) via a flexurally rigid holding bracket (6), and the second connecting wire (5) is electrically connected with a second contact pin (16) via a metallic contact element (7). The contact pins (15, 16) each extend out from a bore of a ceramic base (10). To provide an improved optical emitter which can be manufactured with lower expenditures of time and cost, the holding bracket (6) and the first connecting pin (15) are designed in one piece and the first contact pin (15) is provided with an anti-slip safety on both sides of the first bore in the base (10).
Abstract:
The spectral energy characteristic of a discharge lamp is controlled by changing the density of the fill substance. The spectral characteristic can be shifted while substantially maintaining its shape by changing the density of the fill. A sulfur or selenium containing discharge lamp which is operated at a pressure of at least about 1 atmosphere contains a low ionization potential substance in the fill. Characteristics which are improved are one or more of spatial color uniformity, extinguishing characteristics, and bulb starting reliability. Particular substances which are added to the fill are alkali metal containing substances, III B metal containing substances, and alkaline earth metal containing substances. When light is reflected back into the bulb, the light which is re-emitted is stronger in the higher wavelengths.