Starting aid for hid lamp

A technology of auxiliary electrodes and light sources, applied in the field of starting auxiliary devices, can solve problems such as unsatisfactory solutions, expensive manufacturing, and reduced utilization rate

Inactive Publication Date: 2010-01-13
OSRAM SYLVANIA INC
7 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Second, the photons generated by the DBD have to pass through the wall of the discharge vessel (made of quartz) and can be absorbed, thus reducing its utilization
[0005] While a...
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Abstract

An arc discharge light source (10) comprises a translucent body (12) having a hollow center 14 and oppositely disposed ends (16, 18). A cathode lead-in 20 is positioned in one of the ends (16) and terminates at a first end (22) in a cathode electrode (24) within the hollow center (14) and a second end (26) in a connector (28) for a power supply. An anode lead-in 30 is positioned in the other of the ends (18) and terminates at a first end (32) in an anode electrode (34) within the hollow center (14) and at a second end (36) in a connector (40) for a power supply. A space (42) between the cathode electrode (24) and the anode electrode (34) within the hollow center (14) defines an arc gap. An arc generating and sustaining medium (43) is provided within the hollow center (14) and a starting aid (41) comprising an auxiliary electrode (44) substantially surrounds the anode electrode (34) and is positioned solely on the external surface (46) of the body (12) and is electrically connected to the cathode lead-in (20).

Application Domain

Gas discharge lamp details

Technology Topic

Auxiliary electrodeEngineering +5

Image

  • Starting aid for hid lamp
  • Starting aid for hid lamp
  • Starting aid for hid lamp

Examples

  • Experimental program(1)

Example Embodiment

[0013] For a better understanding of the present invention and its other and additional objectives, advantages and capabilities, refer to the following disclosure and appended claims in conjunction with the above-mentioned drawings.
[0014] Now referring more specifically to the attached drawings, figure 1 An arc discharge light source 10 is shown in FIG. 1, which includes a translucent body 12 with a hollow 14 and opposite ends 16, 18. The body 12 is preferably formed of quartz.
[0015] The cathode lead-in 20 is located at the end 16 and terminates at the first end 22 in the cathode electrode 24 within the hollow 14 and the second end 26 in the connector 28 for power supply. The anode lead-in 30 is located at the other end 18 and terminates at the first end 32 in the anode electrode 34 within the hollow 14 and at the second end 36 in the connector 40 for power supply. Generally, the cathode electrode and the anode electrode are tungsten and are fixed to molybdenum foils 20a, 30a, respectively, which are sealed in the ends of quartz. There is a space 42 between the cathode electrode 24 and the anode electrode 34 within the hollow 14 and it defines an arc gap.
[0016] It is known that there is an arc generating and maintaining medium 43 in the hollow 14.
[0017] The starting auxiliary device 41 includes an auxiliary electrode 44 that sufficiently surrounds the anode electrode 34, which is separately located on the outer surface 46 of the body 12 and is electrically connected to the cathode lead-in 20.
[0018] Such as figure 1 As shown, the auxiliary electrode 44 includes at least two windings 44a, such as figure 2 The illustrated auxiliary electrode 44 includes a sheath-like electrical conductor 44b. When the light source is intended to be used as a projection light source, the electrical conductor 44b can be opaque or a metallic or conductive coating.
[0019] image 3 Graphically illustrates the utilization results of several solutions of the present invention relative to the prior art, where the X-axis represents the breakdown voltage in kV, and the Y-axis represents the ignition capability P according to the different voltages of the starting auxiliary device used. DC (Assuming the possibility of waiting indefinitely for ignition). The solid line connecting the "box" represents the start-up aid of the present invention, and the remaining three represented by the "triangle", "open circle" and "closed circle" represent the "bubble" technology different versions. It will be seen that 100% of the ignition capacity is obtained by using the starting auxiliary device of the present invention (ie, the auxiliary electrode sleeve 44), while the prior art is preferably 80%. In all cases, the DBD generates UV and VUV photons, which cause breakdown between the main electrodes; however, since the DBD is generated in the full view of the cathode and not behind the anode, the present invention achieves a much greater effect.
[0020] The above discussion only shows and describes the currently considered preferred embodiments of the present invention. It is obvious to those skilled in the art that various kinds of things can be made here without departing from the scope of the present invention defined by the appended claims. Changes and modifications.

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Description & Claims & Application Information

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