CN201751978U - Sealing molybdenum foil - Google Patents
Sealing molybdenum foil Download PDFInfo
- Publication number
- CN201751978U CN201751978U CN2010202326258U CN201020232625U CN201751978U CN 201751978 U CN201751978 U CN 201751978U CN 2010202326258 U CN2010202326258 U CN 2010202326258U CN 201020232625 U CN201020232625 U CN 201020232625U CN 201751978 U CN201751978 U CN 201751978U
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- molybdenum foil
- electrode
- sealing
- foil
- trench structure
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- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
The utility model discloses a sealing molybdenum foil comprising a pair of electrodes and a molybdenum foil, wherein the molybdenum foil is a rectangular foil and provided with a groove structure taking the centre line in the length direction of the molybdenum foil as the axis; the pair of electrodes are respectively arranged at two ends of the groove structure; and parts of the electrodes are welded in the groove structure. For the sealing molybdenum foil, since the circular arc of the groove structure is the same with the radius of the electrode, accurate and fast positioning can be realized without special tools, and since the contact surface between the cambered surface of the groove-shaped molybdenum foil and an electrode stem or a lead is greatly increased than the molybdenum foil, the safety and stability of a light are further improved.
Description
Technical field
The utility model relates to a kind of electronic devices and components, particularly a kind of sealing-in molybdenum foil.
Background technology
Short arc superhigh intensity discharge lamp is the HID light source of electrode spacing less than 10mm, is widely used in the directional lighting device with higher brightness and uniformity requirement, need cooperate with certain optical systems usually and realize the specific illumination purpose.For example be used for the superhigh pressure xenon lamp of cinematographic projector and searchlight, the superhigh pressure Xenon gas metallic halogen lamp of automobile front, superhigh pressure Metal halogen lamp, xenon lamp and the mercury lamp of the illumination of stage video display, need and laser pumping, Medical Devices HID light source that optical system is used, and the non-illumination HID light source etc. that utilizes ultraviolet, infrared radiation by beam splitting system.The basic structural feature of this class light source is the bubble pipe of adopting quartz glass material, utilizes the molybdenum foil of weld metal electrode and lead-in wire and quartz glass sealing by fusing to form airtight discharging chamber.Its common technique feature is that electrode spacing needs accurately control, and simultaneously, the stability of bulb HTHP operating state needs to have between molybdenum foil and the quartz glass good thermal stress and mates and guarantee.
Little Display projector is typical case's representative of this class light source with the short arc ultrahigh pressure mercury lamp.This light source is to be higher than 100W/cm by the tube wall load
2The quartz glass bulb pipe, the axial opposed tungsten electrode of inclosure, and packed density is higher than 0.2mg/mm
3Mercury, the inert gas of about 104Pa and micro-halogen are made as operation material.The pole span of this lamp may be as little to 1mm, and cell-shell need bear about 1000 ℃ high temperature and the pressure that is higher than 200atm during work.
In the prior art, the electrode assemblie of above-mentioned short arc superhigh intensity discharge lamp is about 20～30 μ m by tungsten electrode, fundamental sum electrode diameter identical molybdenum lead-in wire and thickness, and the edge is that the molybdenum foil spot welding of cutting edge shape forms.In order to increase the current-carrying of spot welding intensity and electrode assemblie, generally adopt and between electrode, lead-in wire and molybdenum foil, use the transition of tantalum paillon foil respectively in addition.
In the prior art; the sealing-in of above-mentioned short arc superhigh intensity discharge lamp; be according to the pole span of setting with electrode assemblie; be positioned in the quartz bulb pipe under vacuum or the inert gas shielding; control the quartz ampoule at flame heat molybdenum foil position then, make it fusing and shrink, fit tightly with molybdenum foil and form sealed portion; and electrode stem is fixed in the cell-shell sidepiece quartz, then electrode tip is in the cell-shell cavity.For guarantee as far as possible sealing-in quality and electrode in cell-shell in just spend, cell-shell and flame are relatively rotated, and the sealed portion of melting attitude are carried out compression molding.
Under prior art, the pole span Deviation Control has belonged to the limit at 0.5mm after the lamp sealing-in.This mainly is that following factor causes:
1, electrode, the assembly welding error of lead-in wire and molybdenum foil.The coaxiality deviation of electrode and lead-in wire and molybdenum foil, and this deviation since material, the architectural feature of molybdenum foil and bubble pipe in welding and assembling, be difficult to be corrected, thereby will show in the wick after the sealing-in.Even can not improve at all to sealing-in section mold pressing processing yet, is being under the high situation of pole span required precision especially, this problem is that this area professional and technical personnel is known.Suppose that electrode length is 10mm, target pole span 1.1mm.If guarantee L2-L1≤0.1mm, then the axial deviation angle of two electrodes must be less than 1.4 °.In fact, under flat molybdenum sheet structure, even if adopt frock, kind electrode assembly welding precision also is difficult to guarantee.
2, quartz ampoule melts the electrode skew when contracting.This area professional and technical personnel is known, and the width of molybdenum foil internal diameter common and the quartz bulb pipe is approaching as far as possible to be the general requirement of process for sealing.When sealing-in, because negative pressure and evenly heating, the quartz bulb pipe of fusion is synchronous radially.After electrode assemblie is located in quartz ampoule, electrode stem and quartz bulb pipe and disalignment, the molten quartz bulb pipe that contracts is the contact electrode bar at first, electrode stem is produced pressure, the electrode stem of incandescent attitude is pressed to opposite side, and final when the tube wall of opposite side is knotted molybdenum foil, in fact electrode tip has departed from the quartz bulb tube's axis and has been fixed up, like this, electrode tip can to the back side deflection of molybdenum foil solder side.
On the other hand, there is the solder joint inequality in the welding between prior art bottom electrode bar and the molybdenum foil, rosin joint, dry joint problem, and cause quality, potential safety hazards such as assembly ampacity deficiency thus.This is because electrode stem, diameter wire and molybdenum foil thickness differ about 10 times, is difficult to during pulse welding guarantee that electrode stem and molybdenum foil soak into well and uniformly.Under less at the electrode stem diameter, and the high especially tube wall load condition with higher, adopt laser welding or the wetted area that between electrode stem and molybdenum foil, forms with the tantalum piece transition less than 1/5 of electrode stem sectional area, can not guarantee to have enough ampacitys and intensity.
The utility model content
Goal of the invention: at the deficiencies in the prior art, the utility model discloses a kind of can be when effectively guaranteeing short arc superhigh intensity discharge lamp sealing-in pole span precision and electrode axiality, the wetted area of electrode pads is increased greatly, guarantee the sealing-in molybdenum foil of solder joint ampacity and intensity.
Technical scheme: the utility model discloses a kind of sealing-in molybdenum foil, described sealing-in molybdenum foil comprises pair of electrodes and a slice molybdenum foil, and described molybdenum foil is a rectangle paillon foil, and the center line that is provided with on molybdenum foil with the molybdenum foil length direction is the trench structure of axis; Described pair of electrodes is separately positioned on the two ends of trench structure, and the part of electrode is welded in the trench structure.
The semicircular arc groove that described trench structure matches for the radius with electrode.
The junction of described trench structure and molybdenum foil is provided with the chamfering that is not less than 0.2mm.
Molybdenum foil that the utility model uses adopts thickness to be about 20～30 μ m, the edge molybdenum foil as the cutting edge dress, can be by cold working mode moulding such as punching press, extruding.
The circular arc of trench structure described in the utility model is identical with the radius of electrode, need not special frock can realize accurately and location fast, and effectively the space angle excursion of control electrode is less than 1 °, thereby can make the pole span deviation less than 0.05mm.
Because the trench structure that passes through of central authorities, can make molybdenum foil that thickness only has 20～30 μ m by tetanic, make sealing-in molybdenum foil integral body have rigidity, thereby prevented the crooked position error that produces of molybdenum foil.
When the utility model is made because trench structure and electrode are coaxial, quartz ampoule is molten when contracting in molybdenum foil both sides contact electrode simultaneously, and pressure equal and opposite in direction all the time, direction is opposite.In addition, because the contact-making surface of the cambered surface of grooved molybdenum foil and electrode stem or lead-in wire increases during than molybdenum foil greatly, can make the wetted area between them reach 2/5 of electrode stem sectional area, thereby ampacity and intensity are guaranteed.
Because by arc transition, fused silica glass can be fitted fully with this position when sealing-in, thereby can avoid producing the possibility of gas line or continuous air bubbles between circular groove and the open and flat portion of molybdenum foil, guarantee the air-tightness of lamp.
Beneficial effect: the disclosed a kind of sealing-in molybdenum foil of the utility model, because the circular arc of trench structure is identical with the radius of electrode, need not special frock can realize accurately and location fast that effectively the space angle excursion of control electrode is less than 1 °, thereby can make the pole span deviation less than 0.05mm; Because the contact-making surface of the cambered surface of grooved molybdenum foil and electrode stem or lead-in wire increases during than molybdenum foil greatly, thereby the fail safe and the stability of lamp have further been improved.
Description of drawings
Accompanying drawing is a structural representation of the present utility model.
Embodiment
The utility model is further explained below in conjunction with accompanying drawing.
The utility model discloses a kind of sealing-in molybdenum foil, described sealing-in molybdenum foil comprises pair of electrodes 1 and a slice molybdenum foil 2, and described molybdenum foil 2 is a rectangle paillon foil, and being provided with on molybdenum foil 2 with the center line of molybdenum foil 2 length directions is the trench structure 3 of axis; The two ends that are separately positioned on trench structure 3 of described pair of electrodes 1, the part of electrode 1 is welded in the trench structure 3.
The semicircular arc groove that described trench structure 3 matches for the radius with electrode 1.
The junction of described trench structure 3 and molybdenum foil 2 is provided with the chamfering that is not less than 0.2mm.
Molybdenum foil that the utility model uses 2 adopts thickness to be about 20～30 μ m, the edge molybdenum foil 2 as the cutting edge dress, can be by cold working mode moulding such as punching press, extruding.
The groove circular arc of trench structure 3 described in the utility model is identical with the radius of electrode 1, need not special frock can realize accurately and location fast, and effectively the space angle excursion of control electrode 1 is less than 1 °, thereby can make the pole span deviation less than 0.05mm.
Because the trench structure 3 that passes through of central authorities, can make molybdenum foil 2 that thickness only has 20～30 μ m by tetanic, make sealing-in molybdenum foil integral body have rigidity, thereby prevented the molybdenum foil 2 crooked position errors that produce.
When the utility model is made because trench structure 3 and electrode 1 are coaxial, quartz ampoule is molten when contracting in molybdenum foil 2 both sides contact electrode 1 simultaneously, and pressure equal and opposite in direction all the time, direction is opposite.In addition, owing to increase greatly during the more flat molybdenum foil of the contact-making surface of the cambered surface of grooved molybdenum foil 3 and electrode 1, can make the wetted area between them reach 2/5 of electrode 1 sectional area, thereby ampacity and intensity are guaranteed.
Because by arc transition, fused silica glass can be fitted fully with this position when sealing-in, thereby can avoid producing the possibility of gas line or continuous air bubbles between trench structure 3 and the molybdenum foil 2 open and flat portions, guarantee the air-tightness of lamp.
The utility model provides a kind of thinking and method of sealing-in molybdenum foil; the method and the approach of this technical scheme of specific implementation are a lot; the above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications; these improvements and modifications also should be considered as protection range of the present utility model, and all available prior art of each part not clear and definite in the present embodiment is realized.
Claims (3)
1. a sealing-in molybdenum foil is characterized in that, described sealing-in molybdenum foil comprises pair of electrodes (1) and a slice molybdenum foil (2), and described molybdenum foil (2) is a rectangle paillon foil, and being provided with on molybdenum foil (2) with the center line of molybdenum foil (2) length direction is the trench structure (3) of axis; Described pair of electrodes (1) is separately positioned on the two ends of trench structure (3), and the part of electrode (1) is welded in the trench structure (3).
2. a kind of sealing-in molybdenum foil according to claim 1 is characterized in that, described trench structure (3) for and the semicircular arc groove that matches of the radius of electrode (1).
3. a kind of sealing-in molybdenum foil according to claim 1 and 2 is characterized in that, the junction of described trench structure (3) and molybdenum foil (2) is provided with the chamfering that is not less than 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202326258U CN201751978U (en) | 2010-06-22 | 2010-06-22 | Sealing molybdenum foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202326258U CN201751978U (en) | 2010-06-22 | 2010-06-22 | Sealing molybdenum foil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201751978U true CN201751978U (en) | 2011-02-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202326258U Expired - Fee Related CN201751978U (en) | 2010-06-22 | 2010-06-22 | Sealing molybdenum foil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201751978U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138952A (en) * | 2013-05-07 | 2014-11-12 | 上海亚尔光源有限公司 | Arc-shaped molybdenum plate and manufacturing method and application thereof |
-
2010
- 2010-06-22 CN CN2010202326258U patent/CN201751978U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138952A (en) * | 2013-05-07 | 2014-11-12 | 上海亚尔光源有限公司 | Arc-shaped molybdenum plate and manufacturing method and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110223 Termination date: 20140622 |
|
| EXPY | Termination of patent right or utility model |