CN101625955A

CN101625955A - Starting aid for hid lamp

Info

Publication number: CN101625955A
Application number: CN200910163964A
Authority: CN
Inventors: M·科斯特伦; H·阿德勒
Original assignee: Osram Sylvania Inc
Current assignee: Osram Sylvania Inc
Priority date: 2008-06-26
Filing date: 2009-06-26
Publication date: 2010-01-13

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).

Description

The startup servicing unit of HID lamp

Technical field

The present invention relates to a kind of arc discharge light source, more particularly relate to the startup servicing unit that is used for this light source.More particularly, its startup servicing unit that relates to a kind of dependence dielectric barrier discharge (DBD) and generate vacuum ultraviolet photon (VUV).

Background technology

Adopting the high intensity electric arc discharge tube is a kind of feasible selection as light source for producing effective lighting, and they have been used as such for many years.Basically they are realized with two kinds of forms, depend on their common designated low pressure of structure or high pressure.Generally, low-voltage light source uses argon to produce and keep the part of medium as electric arc.Because these light sources use electrode to limit arc gap between electrode, they must adopt this or the sort of ballast to be controlled at two power circuits under the extreme case, that is, and and before startup, there is the situation of similar open circuit in this device, and the situation that is equal to short circuit after startup.

Because unique startup requirement often has such situation, promptly uses this or the sort of startup servicing unit to help the startup of initialization electric arc.As for initialization DBD, this startup servicing unit comprises two kinds of basic types: in arc chamber, produce DBD those and outside arc chamber, produce those of DBD.The former example is in U.S. Patent No. 3,715, and shown in 622, the latter's a example is in U.S. Patent No. 6,222, shown in 320.In addition, the latter concrete form uses so-called " bubble in the pressure (bubblein the press) ".For example in U.S. Patent No. 5,323, this servicing unit has been shown in 091 and No.5,959,404, they have all transferred assignee of the present invention.Two technology in this back produce DBD really in bubble; Yet its photon is had to pass through quartz ampoule and is arrived main electrode in the discharge tube, and should absorb most UV radiation by quartz, and it has significantly reduced the usefulness that starts servicing unit.In addition, the DBD in this bubble occurs in after the negative electrode, therefore has this concrete legibility (visibility) problem that starts the usefulness of servicing unit that limits.Equally, as a part that starts servicing unit, use molybdenum foil with sharpened edge.Because sharpened edge promotes the electronics emission, paper tinsel as negative electrode work liken to into anode better.Equally, because the low capacity of bubble does not almost have free electron can allow paper tinsel as anode working on the wall of bubble.On the other hand, when paper tinsel when ignition phase is exposed to strong ion bombardment, in bubble, use paper tinsel can cause its degeneration as negative electrode.

In U.S. Patent No. 6,201, another technology shown in 348 wherein starts servicing unit and is included in the loop line that the lamp base portion forms coil, produces low pressure DBD in the buffer gas of outer jacket.The first, the DBD of generation be diffusion and produce away from negative electrode.The second, have to pass the wall of discharge tube (making) and can be absorbed by the photon that DBD produces by quartz, therefore reduced its utilance.

Though all these various technology have proved and can use that the scheme of the solution reliable ignition problem that they provide is unsatisfactory, and expensive and/or manufacture difficulty.

Summary of the invention

Therefore, an object of the present invention is to eliminate the shortcoming of prior art.

Another object of the present invention is to improve to start servicing unit.

Another object of the present invention is to strengthen to start servicing unit.

These purposes are in one aspect of the invention by providing the arc discharge light source to realize, this light source comprises: the translucent body with end of hollow center and positioned opposite, be positioned at the negative electrode lead-in of an end, first end place in the cathode electrode in hollow and the second end place of the joint that is used for the power supply stop.The anode lead-in is arranged in another end, and the second end place of first end place in the anode electrode in hollow and the joint that is used for the power supply stops.Cathode electrode in hollow and the space boundary between the anode electrode arc gap.Electric arc generates and keeps medium in hollow; Auxiliary electrode fully surrounds anode, and is positioned at separately on the hollow outer surface, and is electrically connected to the negative electrode lead-in.

Description of drawings

Fig. 1 is the front view of the embodiment of the invention;

Fig. 2 is that the optional embodiment of the present invention similarly schemes;

Fig. 3 is the figure that describes the advantage of the relative prior-art devices of the present invention.

Embodiment

For a better understanding of the present invention and other and other purpose, advantage and ability, come with reference to following discloses and appended claim in conjunction with above-mentioned accompanying drawing.

Now more specifically with reference to the accompanying drawings, a kind of arc discharge light source 10 has been shown among Fig. 1, it comprises having hollow 14 and the translucent body 12 of the

end

16,18 of positioned opposite.Body 12 is preferably formed by quartz.

Negative electrode lead-in 20 is positioned at end 16, and second end, 26 places of first end, 22 places in the cathode electrode in hollow 14 24 and the joint 28 that is used for the power supply stop.Anode lead-in 30 is positioned at another end 18, and second end, 36 places of first end, 32 places in the anode electrode in hollow 14 34 and the joint 40 that is used for the power supply stop.Usually, cathode electrode and anode electrode are tungsten and are individually fixed in

molybdenum foil

20a, 30a that this paper tinsel is sealed in the quartzy end.Have space 42 between cathode electrode 24 in described hollow 14 and the anode electrode 34, and it defines arc gap.

Known have electric arc to generate and keep medium 43 in hollow 14.

Start the auxiliary electrode 44 that servicing unit 41 comprises abundant encirclement anode electrode 34, it is positioned on the outer surface 46 of body 12 individually, and is electrically connected to negative electrode lead-in 20.

As shown in Figure 1, auxiliary electrode 44 comprises at least two circle coiling 44a, and auxiliary electrode 44 comprises cover shape (sheath-like) electric conductor 44b as shown in Figure 2.When light source was planned as projection light source, electric conductor 44b can be opaque or metal or conductive coating.

Fig. 3 is exemplifying illustrated the relative prior art of the present invention plurality of proposals utilize the result, wherein X-axis represents with kV to be the puncture voltage of unit, and Y-axis is represented the ignition ability P according to the different voltages of the startup servicing unit that uses _DC(the igniting possibility of igniting can endless be waited in supposition).The solid line that connects " square frame " is represented startup servicing unit of the present invention, and the different editions of three kinds of expressions of residue " bubble " technology of explaining by " triangle ", " empty circles (open circle) " and " solid circles (closed circle) ".To see and utilize startup servicing unit of the present invention (being auxiliary electrode sleeve pipe 44) to obtain 100% ignition ability, and prior art is preferably 80%.DBD produces UV and VUV photon in all cases, and it causes the puncture between the main electrode; Yet, owing to DBD is created in the full view of negative electrode, and not after anode, so the present invention has obtained much bigger effect.

More than discuss and only illustrate and described the present preferred implementation of thinking of the present invention, it will be apparent for a person skilled in the art that under the situation of the scope of the invention that does not break away from the claims qualification, can make variations and modifications at this.

Claims

1, a kind of arc discharge light source comprises:

Translucent body has hollow and end positioned opposite;

Be arranged in one negative electrode lead-in of described end, first end place in described cathode electrode in hollow and the second end place that is used for the joint of power supply stop;

Be arranged in another anode lead-in of described end, first end place in described anode electrode in hollow and the second end place that is used for the joint of power supply stop;

Limit arc gap described in hollow described cathode electrode and the space between the described anode electrode;

Be positioned at described hollow electric arc and generate and keep medium; With

Start servicing unit, comprise auxiliary electrode, this auxiliary electrode fully surrounds described anode and is positioned at separately on the outer surface of described translucent body, and is electrically connected to described negative electrode lead-in.

2, arc discharge light source as claimed in claim 1, wherein said auxiliary electrode comprise the coiling with at least two circles.

3, arc discharge light source as claimed in claim 1, wherein said auxiliary electrode comprise cover shape electric conductor.

4, arc discharge light source according to claim 3, wherein said cover shape electric conductor comprises conductive coating.