CN101310363A - External electrode driven discharge lamp, method for producing same, and liquid crystal display - Google Patents
External electrode driven discharge lamp, method for producing same, and liquid crystal display Download PDFInfo
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- CN101310363A CN101310363A CNA2006800423955A CN200680042395A CN101310363A CN 101310363 A CN101310363 A CN 101310363A CN A2006800423955 A CNA2006800423955 A CN A2006800423955A CN 200680042395 A CN200680042395 A CN 200680042395A CN 101310363 A CN101310363 A CN 101310363A
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- outer electrode
- discharge lamp
- external electrode
- glass bulb
- welding alloy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/044—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by a separate microwave unit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
- H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Since the damage of thermal shock in a production process is prevented, the reliability is improved and the reduction of the production cost is achieved. The invention comprises a hollow glass bulb (1) forming a hermetically sealed space, a discharge dielectric gas is sealed in the glass bulb, and an external electrode (22) is arranged on the outer surface of the glass bulb (1) for guiding a dielectric barrier to discharge to the discharge dielectric gas. The external electrode (22) is a plate composed of a conductive material, and is connected to the glass bulb by a fusion bonding layer (5) of a solder alloy. The fusion bonding layer is arranged around the outer surface of the glass bulb (1), and the solder alloy is an alloy of bismuth and tin containing 30-70% by weight of bismuth.
Description
Technical field
[0001] the present invention relates to a kind ofly be used for the external electrode driven discharge lamp structure backlight and the production method thereof of display panels or the like and use this external electrode driven discharge lamp as liquid crystal display device backlight.
Background technology
[0002] in order to make the visual of the electronic image that is formed on the liquid crystal panel, the illuminating lamp that liquid crystal display need provide from the outside.This means of illumination comprises the passive light illumination mode that uses ambient light and uses the active light illumination mode of light source, and described light source is such as at the rear side of display panels or the cold-cathode lamp on the front side, light-emitting diode or the like.The large-scale display device that initiatively has the display panels of large-size under the light illumination mode generally uses so-called backlight, it is the place, rear portion that light source is arranged on display panels, and hinted such problem, promptly, relevant with the trend that size increases, owing to increase the amount of using fluorescent lamp, increased production cost, therefore improving fluorescent lamp needs.
[0003] being used for fluorescent lamp backlight is cold-cathode lamp and outer electrode driving fluorescent lamp, and usually, cold-cathode lamp is used at large.Cold-cathode lamp comprises a pair of internal electrode that is arranged in fluorescent lamp, and voltage is applied in and is used for discharge between the electrode.Yet cold-cathode lamp can not adapt to minimizing on the display thickness, saves power consumption, lower production cost or the like, however the outer electrode driving fluorescent lamp arouse attention because it can be gone to reduce production cost and power consumption by expectation.As this outer electrode driving fluorescent lamp, JP-2003-91007-A discloses structure, and wherein the bullion electrode is arranged on the outside at glass tube two ends respectively.
Summary of the invention
[0004] by way of parenthesis, in aforesaid outer electrode driving fluorescent lamp, for fear of the local problem that raises or the like of the temperature of the parts of the problem that changes such as lamp current when a plurality of fluorescent lamps are lighted abreast, outer electrode, glass tube must closely contact with the metal material that comprises outer electrode.Yet it is limited being machined in the adhesive improvement, and in order to overcome the problems referred to above, its expection is filled the welding alloy that mainly comprises tin and in the space, be used for combination between the inner surface of glass tube exterior surface and outer electrode.
[0005] on the other hand, the welding alloy that mainly comprises tin has average coefficient of linear expansion, is approximately 230 * 10 in scope
-6Cm/cm/ ℃ to 250 * 10
-6In cm/cm/ ℃, its be worth gazing at than the coefficient of linear expansion 51 * 10 of glass tube
-6Cm/cm/ ℃ big, and therefore welding temperature is raised to about 250 ℃ in operating process.
[0006] for this reason, when the melted join layer of welding alloy was formed between glass tube and the outer electrode in the space, when the end of the glass tube that connects outer electrode immersed the weld groove of molten solder alloy, glass tube may be owing to thermal shock damages.Equally, even after outer electrode has been welded on the glass tube, when welding alloy welded, glass tube can cause can not guaranteeing to be used for the abundant integrity problem of liquid crystal display as backlight owing to the difference of the coefficient of linear expansion between welding alloy and the glass tube is damaged.
[0007] thereby, the object of the present invention is to provide a kind of external electrode driven discharge lamp, it can prevent to damage, described damage may occur in that outer electrode was welded on the housing at that time and after, with the raising reliability, and production method, and liquid crystal display.
[0008] to achieve these goals, external electrode driven discharge lamp of the present invention comprises housing, described housing is made the seal cavity that is used for determining hollow by glass material, be sealed in the discharge medium gas in the inside of housing, with the outer electrode that is arranged on the housing outer surface, be used to guide dielectrically impeded discharge to discharge medium gas, wherein outer electrode is made by the plate that conductive material forms, and by being arranged on the melted join layer combination of housing outer surface welding alloy on every side, and described welding alloy is the alloy of bismuth and tin, calculates the bismuth that comprises 30%-70% by weight.
[0009] external electrode driven discharge lamp according to the present invention disposes with aforementioned manner, because forming the welding alloy of melted join layer is made up of bismuth, tin, copper, the coefficient of linear expansion of melted join layer can be approaching with the coefficient of linear expansion of the casing of being made by glass material, therefore, when outer electrode combines with welding alloy with housing, because the damage that thermal shock produces is prevented from.In addition, according to this external electrode driven discharge lamp, because the melted join layer of welding alloy is formed between outer electrode and the housing satisfactorily, the variation of lamp current has reduced when a plurality of discharge lamps are parallel when lighting, and has prevented local rising of temperature of the parts of outer electrode 22.As a result, the reliability of external electrode driven discharge lamp has improved, and relevant production mistake has reduced.
[0010] same, externally in the electrode drive discharge lamp, except that bismuth and tin, welding alloy preferably comprises copper, and the scope of calculating by weight is 0.01% to 2%.By adding copper, the welding alloy of fusing becomes and is more suitable for drawing, thereby welding alloy can more easily be applied on the outer surface of housing.
[0011] according to liquid crystal display of the present invention, successively, comprise the external electrode driven discharge lamp that the present invention is above-mentioned, and display panels, wherein external electrode driven discharge lamp is used as the backlight of display panels.
[0012] according to the method for production external electrode driven discharge lamp of the present invention, be to produce external electrode driven discharge lamp, it comprises the housing of being made the seal cavity that is used for definite hollow by glass material; Be sealed in the discharge medium gas of enclosure interior; Be arranged on the outer electrode of housing outer surface, described electrode is used to guide dielectrically impeded discharge to discharge medium gas, wherein outer electrode is made by the plate that conductive material forms, and by being arranged on the melted join layer combination of housing outer surface welding alloy on every side, and described welding alloy is the alloy of bismuth and tin, calculates by weight to comprise bismuth 30%-70%.Described method comprises the first step, and outer electrode is connected on the housing; In second step, between the inner surface of the outer surface of housing and outer electrode, use welding alloy, to form the melted join layer.
[0013] according to the present invention, housing keeps by the melted join layer of welding alloy satisfactorily with the situation that combines of outer electrode, and the coefficient of linear expansion of melted join layer can be more approaching with the coefficient of linear expansion of the housing of being made by glass.Thereby according to the present invention, the variation of lamp current reduces when a plurality of discharge lamps are parallel when lighting, and discharge lamp can prevent that electrode is welded on the housing to improve being damaged at that time and later on of reliability.
Description of drawings
[0014]
Fig. 1 is the end view that shows the external electrode driven discharge lamp of first embodiment;
Fig. 2 is the end view of end that shows the external electrode driven discharge lamp of first embodiment;
Fig. 3 A is the sectional view along line A-A subdivision that shows the external electrode driven discharge lamp of first embodiment;
Fig. 3 B is the sectional view along line B-B subdivision that shows the external electrode driven discharge lamp of first embodiment;
Fig. 4 A is the block diagram that shows the method for welding outer electrode in a second embodiment;
Fig. 4 B is the block diagram that is presented at the method for welding outer electrode among described second embodiment;
Fig. 5 A is the vertical cross-section diagram that shows the external electrode driven discharge lamp of second embodiment;
Fig. 5 B is the vertical cross-section diagram of another example that shows the external electrode driven discharge lamp of second embodiment;
Fig. 6 A is the sectional view that shows the external electrode driven discharge lamp of the 3rd embodiment;
Fig. 6 B is the vertical cross-section diagram that shows the external electrode driven discharge lamp of the 3rd embodiment;
Fig. 7 A is the front view of demonstration according to the example of the outer electrode part status of the 4th embodiment;
Fig. 7 B is the three-dimensional side view that shows according to the described outer electrode part status of the 4th embodiment;
Fig. 8 A is the front view of demonstration according to another example of the outer electrode part status of the 4th embodiment;
Fig. 8 B is the three-dimensional side view of demonstration according to another example of the described outer electrode part status of the 4th embodiment.
Embodiment
[0015] hereinafter with reference to the description of drawings specific embodiments of the invention.
[0016]
(first embodiment)
Fig. 1 shows the external electrode driven discharge lamp of present embodiment.Fig. 2 is the end view of demonstration according to the end of the external electrode driven discharge lamp of first embodiment of the invention.Equally, Fig. 3 A, 3B are the sectional views that shows the external electrode driven discharge lamp of first embodiment, and wherein Fig. 3 A is the sectional view along line A-A subdivision, and Fig. 3 B is the sectional view along line B-B subdivision;
[0017] shown in Fig. 1, Fig. 2, Fig. 3 A and 3B, external electrode driven discharge lamp is a fluorescent-mercury lamp, comprises outer electrode 22 one by one on the outer surface at cylindrical glass bulb 1 two ends.
[0018] outer electrode 22 electrically insulated from one another.Glass bulb 1 is configured as the cylinder of optical clear big envelope, is made and inner hollow seal cavity (arc chamber) is filled by the discharge medium gas such as the mist of argon and mercury vapor by Pyrex or the like for example, as an example.For example, the mist of argon and mercury vapor or such as the mist of the rare gas of argon, neon, krypton, xenon or the like or the mist of these rare gas and mercury vapor, sealed as discharge medium gas.Sealing load is from about 1.3 * 10
3Pa to 40 * 10
3Pa (10Torr is to 300Torr).The related primary element that discharges is above-mentioned glass bulb 1, and discharge medium gas and outer electrode 22, but in addition, fluorescent material layer 4 are arranged on the inner surface of arc chamber of glass bulb 1.Fluorescent material layer 4 be used for at glass bulb 1 because the ultraviolet ray of discharge generation converts the light such as another wavelength of visible light to, as an example.Fluorescent material is not particularly limited, but suitably selects according to the light wavelength that should be radiated outside.
[0019] protective layer 3 is formed on the part of inner surface corresponding to each outer electrode 22 below of glass bulb 1, and fluorescent material layer 4 is formed on the remainder.These protective layer 3 purposes are inner surfaces of cover glass bulb 1, and by making such as yttrium oxide metal oxide as an example.In this,, do not influence function of the present invention and effect at all, can be understood from following explanation even without protective layer 3 or fluorescence coating 4 are set.Thereby, the diagram of in A-A profile shown in Fig. 3 A, having omitted the protective layer 3 on the inner surface that is formed on glass bulb 1.
[0020] in this embodiment, each outer electrode 22 forms annular, described annular is twined by band-like plate and is made, for example, by 42 alloys (Fe-Ni42 alloy), Kovar alloy (KOV) or the like is made, and before being installed on the glass bulb 1, has the inside diameter less than the outer dia of the glass bulb 1 when the part status.Yet, the circumferential length of strip metal plate is made and is longer than conventional " C " type electrode fully, and an end of band-like plate and another end are with annular shape crossover in OK range, and further, " the dark winding " is defined as, even the crossover part still keeps after being installed on the glass bulb.This spline structure is called " the dark winding " or " the folded winding ".The length L 1 of end crossover part is not done special qualification.
[0021] in the present embodiment, as mentioned above, the internal diameter expansion of the part of the outer electrode in " the dark winding " structure, and glass bulb 1 is along tube axis direction from its tip engages thereinto, and therefore, outer electrode covers on the glass bulb 1.Because described internal diameter is greater than its internal diameter when the part status, it is fixing to rebound by elasticity after electrode 22 is mounted, thereby cover glass bulb 1.[0022] by annular electrode being covered on the outside of glass bulb 1 with dark winding arrangement, outer electrode 22 easily connects.In addition, because outer electrode 22 is in " the dark winding ", and the part of an annular end and another terminal overlapping, light is prevented from revealing from the breach between the end, unlike conventional " C " type outer electrode.And according to outer electrode 22, electrode zone can be made greater than conventional " C " type outer electrode, and the heat of generation is littler, and can increase the thermal radiation zone.
[0023] material that is used for outer electrode 22 is not limited to 42 alloys or KOV.Yet, consider that the relation of the glass bulb thermal coefficient of expansion of being made by Pyrex, 42 alloys or KOV or the like are preferred, because the thermal coefficient of expansion of its thermal coefficient of expansion and glass is approaching.In other words, equal the thermal coefficient of expansion of glass bulb 1, prevent that glass bulb 1 is damaged by the thermal coefficient of expansion that makes outer electrode 22.
[0024] though do not show that metal plating is applied to the interior perimeter surface (facing the surface of the peripheral surface of glass bulb 1) of outer electrode 22, for example, by flash plating, considers anticorrosion, it is preferred.Especially, because 42 alloys or KOV are by the alloy composition that comprises iron (Fe), when electroplating, outer electrode provides big advantage.Plated material comprises that for example, anti-oxidation metal is such as gold, nickel or the like, and copper, tin, zinc, silver or the like still are not limited to them, as a rule.Equally, outer surface metal plating effectively in a similar manner.
[0025] drives in the fluorescent-mercury lamp at the outer electrode of constructing in the above described manner, by apply from the external power source (not shown) frequency from 10kHz to 100kHz, voltage AC power from about 1KV to 10KV between pair of external electrodes 22, dielectric barrier discharge occurs in the arc chamber, and the tube wall of glass bulb 1 is as dielectric material.Then, the ultraviolet ray excited fluorescence coating 4 that produces by dielectric barrier discharge, thereby the light that is transformed into another wavelength by fluorescence coating 4 passes glass bulb 1 and is radiated outside.
[0026] then, in the external electrode driven discharge lamp of present embodiment, the melted join layer 5 of welding alloy is arranged between outer electrode 22 and the glass bulb 1.In other words, in the present embodiment, by the wet phenomenon of the change of welding alloy, each outer electrode 22 is attached to the two ends of glass bulb 1, and inhomogeneous less than what produced in contact condition by Mechanical Contact.
[0027] and, because welding alloy is a metal material, do not have because the damage that ultraviolet ray produces.Thereby, comprising the outer electrode of the glue/adhesive of conventional organic resin unlike use, the bonding state between outer electrode and the glass bulb does not damage because of the time.
[0028] produces as follows according to the outer electrode 22 of present embodiment.Fig. 4 A shows outer electrode 22 welded condition in the present embodiment.Shown in Fig. 4 A, " the dark winding " outer electrode 22 at first is installed on the outer surface at glass bulb 1 two ends.Then, the leading end of solder bar 6 contacts with the part at the edge on every side of outer electrode 22, and described outer electrode 22 is around glass bulb 1, and soldering iron 7 is coated on outer electrode 22, and heat and ultrasonic energy are applied to outer electrode 22, and glass bulb 1 is around the tube's axis rotation simultaneously.By this way, the welding alloy of fusion is injected in the space between outer electrode 22 and the glass bulb 1, and is injected into by capillarity, and outer electrode 22 dark twines in the space between electrode end in the part overlapping.Equally, the outer electrode 22 that is welded on the glass bulb 1 covers such degree by welding alloy, and promptly they are not visible from the outside.
[0029] when carrying out welding by this method, glass bulb 1 can flatly keep or vertically rise.In the time of on being engaged in glass bulb 1, and before soldered, outer electrode 22 is fixed on the glass bulb 1 by elastic recoil, thereby, even being held vertically, they can welding operation not produced any obstruction from landing on the glass bulb 1 yet.The method that this use soldering iron welded and hot and ultrasonic energy were applied to weld simultaneously target is called " ultrasonic bonding ".
[0030] welding of outer electrode is not limited to above-mentioned " ultrasonic bonding ", but can realize in a similar manner by " the ultrasonic wave immersed solder method " that the following describes.Fig. 4 B shows the welding method based on " ultrasonic wave immersed solder method ".Shown in Fig. 4 B, the welding alloy of fusing is filled in the weld groove 9 that comprises ultrasonic vibrator 8.Then, before the glass bulb 1 that has been coated with outer electrode 22 with " dark twine " structure immersed in the scolder 10 of fusing, and drove ultrasonic vibrator 8.In this way, welding alloy is injected in the space between outer electrode 22 and the glass bulb 1 reposefully, and outer electrode 22 the dark overlapping that twines electrode end in the part between, to form melted join layer 5, it has for example about 100 microns thickness, so welding operation in a satisfactory manner.
[0031] will welding in the scolder that target is immersed in fusing simultaneously like this, the using ultrasound wave energy is called " ultrasonic wave immersed solder method " to the welding method of the scolder of fusing.Under the situation based on the welding of ultrasonic wave immersed solder method, melted join layer 5 also equally is formed on the end surface of glass bulb 1 with shown in Fig. 3 B.
[0032] in the present case of the welding of dipping in method based on ultrasonic bonding, glass bulb 1 general tube's axis vertically immerses in the scolder 10 of fusing, but even in this case, outer electrode 22 was fixed on the glass bulb 1 by elastic recoil before welding, thereby operation is not hindered.According to this ultrasonic wave immersed solder method, the permeability that welding alloy enters the space between outer electrode 22 and the glass bulb 1 is gratifying, and the adhesion of melted join layer improves too.
[0033] when outer electrode 22 and glass bulb 1 is soldered in as present embodiment, the melted join layer of welding alloy can be formed directly on the glass bulb, but, this also has been method for the electrodeposition of metals of elder generation's formation such as nickel, described electrodeposited coating is formed on the outer surface of glass bulb 1, as the lower floor of melted join layer.Do like this, melted join layer 22 improves further to be beneficial to welding operation with the compatibility of glass bulb 1.
[0034] here, will describe the welding alloy that uses in the welding in detail, it is a key character of the present invention.
[0035] by weight, to 70% (weight), to 2% (weight), remainder is a tin to the copper scope of interpolation to the scope that welding alloy comprises bismuth from 0.01% (weight) from 30% (weight).
[0036] purpose that adds bismuth is to reduce the coefficient of linear expansion of welding alloy, thereby the coefficient of linear expansion that makes welding alloy is more near the coefficient of linear expansion of glass bulb 1.When bismuth was less than 30% (weight), the effect that reduces the welding alloy coefficient of linear expansion was bad.When bismuth during greater than 70% (weight), when glass bulb 1 was immersed in the welding alloy of fusing, so-called " ball " may produce, and will be crisp after welding alloy is solidified, and thereby, welding alloy is easier unfriendly to break and peels off.
[0037] copper is used to make the easier drift of welding alloy of fusing, and the purpose of adding is to promote that welding alloy adheres on the outer surface of glass bulb 1.It is not preferred being less than 0.01%, because welding alloy becomes fragile after solidifying.During the many mistake 2% of equivalent, the flowability of the welding alloy of fusing reduces, and unfriendly, when glass bulb 1 is immersed in the welding alloy of fusing, so-called " ball " is more easily produced.
[0038] then, in the external electrode driven discharge lamp of present embodiment, as the example of the component ratio that is used for welding alloy, described welding alloy by weight, by forming of bismuth 40%, copper 0.1% and tin 59.9% be best.
[0039] welding alloy that relates to according to above-mentioned present embodiment, because best wettability is guaranteed for outer electrode 22 and glass bulb 1, be inducted into the space between the outer surface of the interior perimeter surface of outer electrode 22 and glass bulb 1 by capillarity phenomenon welding alloy satisfactorily, thereby can be formed on the space of gamut roughly the roughly melted join layer 5 of uniform thickness satisfactorily.Equally, according to this welding alloy, after in the scolder 10 that is immersed in fusing, when outer electrode 22 is drawn out, adhere to the outer surface of outer electrode and the oxide of inner surface and be prevented from keeping from the teeth outwards, can form melted join layer 5 satisfactorily like this with flat surfaces.
[0040] same, as in other application of above-mentioned welding alloy, welding alloy preferably adopts for example following structure: the conduction of current layer is formed on by ultrasonic wave immersed solder method on the outer surface of glass bulb as outer electrode, for example, in JP-2004-146351-A in the disclosed external electrode driven discharge lamp.In ultrasonic wave immersed solder method, form welding electrode by the welding alloy that uses above-mentioned composition ratio, guaranteed the wettability of welding alloy satisfactorily, therefore, when glass bulb and outer electrode are immersed in the weld groove, exterior materials such as oxide or the like is prevented from being retained on the outer surface of welding immersion layer, the outer surface that comprises the outer electrode of melted join layer forms smooth surface, and do not cause that the out-of-flatness that is created in by oxidation on the periphery and melted join layer can form with homogeneous thickness roughly.Thereby, because the flatness of the outer surface of outer electrode improves, can prevent peeling off of outer electrode, prevent the damage that the injustice owing to oxide causes to glass bulb, guaranteeing and be used to provide the connector good contact condition of power supply, and output and production efficiency have been improved to outer electrode.
[0041] same, form the result who obtains the electrodeposition of metals from interior perimeter surface at each outer electrode 22.In this embodiment, the interior perimeter surface of outer electrode 22 is soldered, and will never directly contact, and its structure can prevent oxidation, still with air, because the wettability of welding alloy has improved in welding process, in the time of in being immersed in weld groove, welding alloy is injected in the space between outer electrode 22 and the glass bulb 1 reposefully, thereby, help welding operation, and improve welding reliability.And, because the applied metal plating in the same manner of the outer surface of outer electrode 22, so melted join layer 5 can be bonded on the outer surface with homogeneous thickness satisfactorily.
[0042] as mentioned above, external electrode driven discharge lamp according to first embodiment, form by bismuth, tin and copper because form the welding alloy of the melted join layer 5 on the space be arranged between outer electrode 22 and the glass bulb 1, can make the coefficient of linear expansion of the coefficient of linear expansion of melted join layer 5 and glass bulb 1 more approaching.Thereby according to this external electrode driven discharge lamp, because the damage of the caused glass bulb 1 of thermal shock, and the damage of welding back glass bulb 1 is prevented from the process that outer electrode 22 is welded to glass bulb 1.
[0043] same, according to this external electrode driven discharge lamp, because the melted join layer 5 of welding alloy is formed between outer electrode 22 and the glass bulb 1 satisfactorily, when a plurality of discharge lamps are lighted abreast, lamp current changes and reduces, and externally the local temperature rising is limited in electrode 22 parts.As a result, can improve the reliability of external electrode driven discharge lamp, reduce the mistake relevant, to reduce production costs with production.
[0044] (second embodiment)
Fig. 5 A, 5B show the vertical cross-section according to the outer electrode of second embodiment.With reference to Fig. 5 A, 5B and Fig. 3 A, 3B, second embodiment has adopted " the dark winding " structure with the identical outer electrode that is of first embodiment, and outer electrode uses above-mentioned welding alloy to be welded on the glass bulb 1, but, difference is that the end surface of outer electrode 24 is extended outside axis direction from the end surface of glass bulb 1.
[0045] by constructing by this way, shown in Fig. 5 A, in having the glass bulb of minor diameter more, according to projection amount L2 from the end surface of the glass bulb 1 of outer electrode 24, melted join layer 5 thickness that are formed on the end face of glass bulb 1 form thicklyer, with do not have comparing of projection, thereby thermal radiation property has correspondingly improved.
[0046] same, when the end surface of sight glass bulb 1 in the cross section is not plane but arc, as shown in Fig. 5 B sectional view, melted join layer 5 begins crooked part in the end surface of glass bulb 1 and becomes thicker, wherein the end surface of outer electrode 25 is from the end surface projection of described glass bulb 1, thereby thermal radiation property has correspondingly improved.
[0047] (the 3rd embodiment)
Fig. 6 A shows the sectional view according to the outer electrode of the 3rd embodiment, and Fig. 6 B shows the vertical subdivision graph according to the outer electrode of the 3rd embodiment.In this, in the sectional view of Fig. 6 A, for as the same reason of first embodiment, the diagram of the protective layer 3 on the inner surface of glass bulb 1 has been omitted.
[0048] with reference to Fig. 6 A, Fig. 6 B and Fig. 3 A, Fig. 3 B together, present embodiment is identical with first embodiment to be, outer electrode 25 is welded on the glass bulb 1 and is to use there welding alloy.Yet the 3rd embodiment is that with the different of first embodiment of the electrode of use " the dark winding " structure it adopts " C " type outer electrode." C " type outer electrode 25 of Shi Yonging is the band-like plate of 42 alloys, KOV or the like in the present embodiment, and the cross section is crooked and coiled annular.Externally in the electrode 25, the internal diameter of described ring during than the part status before on being installed to glass bulb 1 external diameter of glass bulb 1 little, and after being installed on the glass bulb 1, be extended into " C " type, the end of band-like plate is separated from each other.
[0049] when the outer electrode 25 of present embodiment has " C " type, the melted join layer 5 that outer electrode 25 is welded on the glass bulb 1 is arranged on the circumferencial direction of glass bulb 1, lower floor as this outer electrode 25, thereby, be melted binder course 5 from the light of glass bulb 1 radiation and stop, and will can not be directed to the outside from outer electrode 25 " C " type breach part.
[0050] and, because outer electrode 25 and glass bulb 1 are fixing by welding, " C " type outer electrode of making by the complexed metal plate does not have the inhomogeneous contact condition that is created on glass bulb, it only greatly is different from the conventional external electrode with the glass bulb Mechanical Contact.Equally, because melted join layer 5 is not destroyed by ultraviolet ray, contact condition does not damage because of the time, and unlike conventional outer electrode, described conventional electrodes has " C " type outer electrode by using glue/adhesive to glass bulb.
[0051] under the situation of formation according to the outer electrode 25 of present embodiment, outer electrode at first is engaged on the glass bulb 1 in the mode similar to second embodiment.Then, next, melted join layer 5 is applied between glass bulb 1 and the outer electrode 25 by ultrasonic bonding or ultrasonic wave immersed solder method.Even glass bulb 1 vertically rises in welding process, outer electrode 25 can or not produce any obstruction to welding operation from glass bulb 1 landing.The internal diameter that " C " type outer electrode 25 primitively has less than the glass bulb external diameter.Thereby in they were engaged in state on the glass bulb 1, outer electrode was coupled on the glass bulb 1 by its oneself elastic recoil.
[0052] as mentioned above, according to the external electrode driven discharge lamp of present embodiment, because the light that derives from glass bulb is stopped that by the melted join layer 5 around the outer surface setting of glass bulb 5 light is revealed externally and can be eliminated in the electrode 25.
[0053] (the 4th embodiment)
Fig. 7 A shows the front view according to the example of the outer electrode of the 4th embodiment, and Fig. 7 B shows the three-dimensional side view according to the example of the outer electrode of the 4th embodiment.Equally, Fig. 8 A shows the front view of another example, and Fig. 8 B shows the three-dimensional side view of this another example.These Fig. 7 A, Fig. 7 B, Fig. 8 A and Fig. 8 B show the part status of outer electrode before being installed to glass bulb.With reference to Fig. 7 A, Fig. 7 B, Fig. 8 A and Fig. 8 B, mainly comprise the seamless cylinder of making by metallic plate 13 according to the outer electrode 26 of present embodiment.
[0054] cylinder of being made by metallic plate 13 has the internal diameter bigger than the external diameter of glass bulb 1, and wherein is provided with towards the outstanding projection of glass bulb.For example, shown in Fig. 7 A, Fig. 7 B, by diametrically partly drawing cylinder 13 and inwardly outstanding projection 14 as projection.Alternatively, shown in Fig. 8 A and Fig. 8 B, the side surface of cylinder 13 can be cut into down " C " type and rise inwardly to form projection 15.In any case projection amount L3 projection 14 or projection 15 is sized to, under the part status before externally electrode 26 is installed on the glass bulb 1, in to connect the diameter of a circle of leading end of projection 14,15 littler than the external diameter of glass bulb 1.Then, after externally electrode 26 was connected to glass bulb 1, structure was for to push glass bulb 1 downwards by the elastic recoil mode of inner projection.
[0055],, do not pass the light that outer electrode 26 is revealed from glass bulb 1 inside because outer electrode 26 is mainly formed by cylinder according to present embodiment.And when outer electrode 6 was assembled on the glass bulb 1, outer electrode 16 was to be engaged in simply on the glass bulb 1 from the one end along tube axis direction, thereby assembly manipulation is easy.
[0056] outer electrode 26 shown in Fig. 7 A, Fig. 7 B, Fig. 8 A and Fig. 8 B and similar being of first embodiment (seeing Fig. 3 A, 3B), they are welded on the glass bulb 1 with above-mentioned welding alloy.When so doing, be eliminated in the inhomogeneities of contact condition, described inhomogeneities results from the Mechanical Contact of outer electrode, and described electrode is made by metallic plate, is engaged on the glass bulb just.For welding in the present embodiment, after externally electrode 26 is engaged on the glass bulb 1, welding alloy is used the space that enters between glass bulb 1 and the outer electrode 26 by ultrasonic bonding or ultrasonic wave immersed solder method, with the first embodiment similar methods, form melted join layer 5.
[0057] though first to fourth embodiment of above-mentioned explanation any one, illustrated the outer electrode structure of general cylindrical shape, two ends are openings at the fluorescent tube axis direction, the invention is not restricted to this structure.Though do not show, outer electrode can structurally be that the end surface that is closer to the end surface of glass bulb is sealed with the form of lid.So do, because the thermal radiation zone has further increased, thermal radiation effect can be further improved.
[0058] same; show from so far doing explanation; the invention is not restricted in discharge medium gas, comprise the mercury discharge lamp of mercury vapour, and advantageous effects of the present invention is not subjected to having of fluorescent material layer 4 or does not have or the having or not or the influence of material or the like of the kind of fluorescent material layer 4 or protective layer 3.
[0059] same, not only be fit to as the structure of the employing cylindrical shell (glass bulb 1) described among the embodiment according to external electrode driven discharge lamp of the present invention, and the structure of suitable so-called " planar structure ".The external electrode driven discharge lamp structure of this structure is, has the pair of external electrodes on the outer surface that is arranged on two glass plates, and described two glass plates have at interval face-to-face and therebetween, to limit the hollow sealing discharge space.Even have in the external electrode driven discharge lamp of planar structure at this, glass plate and can pass through solder bond by the outer electrode that metallic plate is made.Then, by configuration by this way, can improve the unevenness in the contact condition, described unevenness results from outer electrode and the structure that mode that glass plate contacts by direct mechanical is in contact with one another.Equally, the described contact condition of housing and outer electrode can prevent because the damage that produces from the ultraviolet ray of discharge space radiation.
[0060] example
As Fig. 1,2 and 3A, 3B shown in, the example of fluorescent lamp comprises outer electrode 22, described electrode is arranged on the two ends outside of glass bulb 1 respectively; The molten solder layer 5 of welding alloy is provided with to cover outer electrode 22, and described welding alloy is made up of copper, bismuth, a little copper, and the molten solder layer 5 of described welding alloy is formed in the space between glass bulb 1 and the outer electrode 22.Equally, as the example of welding alloy, described alloy is the alloy of bismuth and tin, and it is made up of 40% bismuth and 0.1% copper by weight.
[0061] as structure, wherein outer electrode 22 is provided with the outside, two ends of the glass bulb 1 of fluorescent lamp respectively, the structure of having used sheet metal to twine around glass bulb 1.In addition, form in the space between metal outer electrode 22 and glass bulb 1 in the process of melted join layer 5 of welding alloy, described welding alloy is by being made up of for tin 40% bismuth, 0.1% copper and all the other by weight, the end portion of the glass bulb 1 by will connecting outer electrode 22 is immersed in the welding alloy of fusing, pull out then, the melted join layer 5 of welding alloy is formed in the space between the outer surface of the inner surface of outer electrode 22 and glass bulb 1.
[0062] structure that is provided with the melted join layer of welding alloy mainly comprises tin and do not comprise bismuth, and is structurally similar to described example, is denoted as comparative example 1.
[0063] comparative example 2 comprises that structure is, be not provided with the melted join layer 5 of welding alloy, for example it has adhesiveness and is used for junction of glass bulb 1 and outer electrode 22 in the example of fluorescent lamp, and structure is for only being provided with the outside, two ends that outer electrode is arranged on fluorescent lamp respectively.This structure and the disclosed outer electrode of above-mentioned JP-2003-91007-A have analog structure.
[0064] comparative example 3 comprises that structure is, is not provided with the outer electrode 22 in the example of fluorescent lamp.Comparative example 3 comprises that structure is, is provided with the melted join layer of the welding alloy that mainly comprises tin, and it is respectively in the outside at the two ends of glass bulb.
[0065] for each fluorescent lamp example, comparative example 1, comparative example 2 and comparative example 3 are measured the result of the rate of peeling off, and have in the production process or do not have thermal shock and damage, and have or free of pinholes and lamp current change, and are presented in the table 1.Peel off the ratio of rate display-object outer electrode part, the copper cash with 1mm diameter is incorporated into described target external electrode part, and (quality under the experience: it is peeled off in the time of n=20) when the stretching weight at the axis direction loading 2Kgf of glass tube.Equally, the fluorescent lamp that has or do not have by lighting production of pin hole detects.
[0066] table 1
| Peel off rate | Thermal shock damages in the production process | Pin hole | Lamp current changes | |
| Example | 0％ | 0.00％ | Do not find | ±4％ |
| Comparative example 1 | 0％ | 0.58％ | Do not find | ±4％ |
| Comparative example 2 | - | 0.00％ | Do not find | ±11％ |
| Comparative example 3 | 60％ | 1.73％ | Find | ±5％ |
Result as shown in table 1 shows, fluorescent lamp of the present invention (example) is compared not only with the fluorescent lamp that lacks needs of the present invention (comparative example 1,2,3) and is had superiority on the characteristic of fluorescent lamp, and on stability, have superiority, also do not resulted from the damage of the thermal shock in the production process or the damage that pin hole produces.Equally, example according to fluorescent lamp, because the damage that does not have the thermal shock in the production process to produce, directly effect is that the defective of breaking has reduced, in addition, to the operation of screen, owing to meet away from the project of the explanation of defective clause part needs not, avoidable test program is contributed very big for reducing production costs.
[0067] according to external electrode driven discharge lamp of the present invention, stability backlight in liquid crystal display can be enhanced, can be fit to use in liquid crystal display to provide at a low price, following can the continuation increases the display screen size of described liquid crystal display.
Claims (12)
1. external electrode driven discharge lamp comprises:
Housing, described housing is made by glass material, is used to limit hollow gas-tight seal space, be sealed in the discharge medium gas of described enclosure interior, and outer electrode, described outer electrode is arranged on the outer surface of described housing, is used to cause that dielectrically impeded discharge is to discharge medium gas;
Wherein said outer electrode is made by the plate of electric conducting material, and passes through the melted join layer combination of welding alloy, and described melted join layer centers on the outer surface setting of described housing, and
Described welding alloy is the alloy of bismuth and tin, contains bismuth 30% to 70% by weight.
2. external electrode driven discharge lamp according to claim 1, wherein said outer electrode are arranged on each end place at the two ends of described cylindrical shell.
3. external electrode driven discharge lamp according to claim 1 and 2, wherein except bismuth and tin, described welding alloy comprises the copper of interpolation, and described copper scope by weight is 0.01% to 2%.
4. external electrode driven discharge lamp according to claim 1, wherein said outer electrode is coated with welding alloy.
5. liquid crystal display device comprises:
External electrode driven discharge lamp, described external electrode driven discharge lamp comprises housing, described housing is made by glass material, be used to limit hollow gas-tight seal space, be sealed in the discharge medium gas of described enclosure interior, and outer electrode, described outer electrode is arranged on the outer surface of described housing, is used to cause that dielectrically impeded discharge is to discharge medium gas; Wherein said outer electrode is made by the plate of conductive material, and melted join layer combination by welding alloy, described melted join layer is around the outer surface setting of described housing, and described welding alloy is the alloy of bismuth and tin, contains 30% to 70% bismuth by weight; With
Display panels,
Wherein said external electrode driven discharge lamp is used as the backlight of described liquid crystal display device panel.
6. external electrode driven discharge lamp according to claim 5, wherein said outer electrode are arranged on each end place at the two ends of described cylindrical shell.
7. according to claim 5 or 6 described external electrode driven discharge lamps, wherein said welding alloy comprises the copper that adds except bismuth and tin, and described copper scope by weight is 0.01% to 2%.
8. external electrode driven discharge lamp according to claim 5, wherein said outer electrode is coated with welding alloy.
9. method of producing external electrode driven discharge lamp, described external electrode driven discharge lamp comprises: housing, described housing is made by glass material, be used to limit hollow gas-tight seal space, be sealed in the discharge medium gas of described enclosure interior, and outer electrode, described outer electrode is arranged on the outer surface of described housing, is used to cause that dielectrically impeded discharge is to discharge medium gas; Wherein said outer electrode is made by the plate of conductive material, and melted join layer combination by welding alloy, described melted join layer is around the outer surface setting of described housing, and described alloy is the alloy of bismuth and tin, contains 30% to 70% bismuth by weight; Said method comprising the steps of:
Described outer electrode is connected to the first step of described housing; With
Between the inner surface of described housing outer surface and described outer electrode, use welding alloy to form second step of described melted join layer.
10. the method for production external electrode driven discharge lamp according to claim 9, wherein said second step comprises by the described outer electrode that will be connected to described housing and being immersed in the welding alloy of fusing, form described melted join layer between described housing outer surface and described outer electrode.
11. the method for production external electrode driven discharge lamp according to claim 10, wherein said second step comprises immerses outer electrode while using ultrasound ripple to welding alloy.
12. the method for production external electrode driven discharge lamp according to claim 9, wherein said second step comprises uses described welding alloy, and described welding alloy comprises the copper that adds except that bismuth and tin, and described copper scope by weight is 0.01% to 2%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005328915A JP4309393B2 (en) | 2005-11-14 | 2005-11-14 | External electrode type discharge lamp, method for manufacturing the same, and liquid crystal display device |
| JP328915/2005 | 2005-11-14 | ||
| PCT/JP2006/322661 WO2007055379A1 (en) | 2005-11-14 | 2006-11-14 | External electrode driven discharge lamp, method for producing same, and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101310363A true CN101310363A (en) | 2008-11-19 |
| CN101310363B CN101310363B (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006800423955A Expired - Fee Related CN101310363B (en) | 2005-11-14 | 2006-11-14 | External electrode driven discharge lamp, method for producing same, and liquid crystal display |
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| Country | Link |
|---|---|
| JP (1) | JP4309393B2 (en) |
| KR (1) | KR100940372B1 (en) |
| CN (1) | CN101310363B (en) |
| WO (1) | WO2007055379A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009125769A (en) * | 2007-11-21 | 2009-06-11 | Nec Lighting Ltd | Solder, external electrode type fluorescent lamp, and liquid crystal display device |
| JP5111188B2 (en) * | 2008-03-25 | 2012-12-26 | ユーテック株式会社 | Power supply terminal for external electrode discharge lamp and light source device |
| JP2009266721A (en) * | 2008-04-28 | 2009-11-12 | Nec Lighting Ltd | External electrode fluorescent lamp and its manufacturing method |
| KR100931611B1 (en) | 2008-06-17 | 2009-12-14 | 주식회사 에이디피엔지니어링 | Soldering apparatus of fluorescent lamp |
| JP2010027560A (en) * | 2008-07-24 | 2010-02-04 | Nec Lighting Ltd | External electrode type discharge lamp and electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2354204Y (en) * | 1998-12-29 | 1999-12-15 | 天津埃梯埃·海联电子有限公司 | Surface-sticked bulb for lighting of liquidcrystal-board displaying background |
| JP4242711B2 (en) * | 2002-06-17 | 2009-03-25 | ハリソン東芝ライティング株式会社 | Low pressure discharge lamp and manufacturing method thereof |
| KR20040106732A (en) * | 2003-06-11 | 2004-12-18 | 삼성전자주식회사 | Lamp and method for manufacturing thereof and back light assembly having the same and liquid crystal display device using the same |
| JP4027849B2 (en) * | 2003-06-19 | 2007-12-26 | ハリソン東芝ライティング株式会社 | Low pressure discharge lamp |
-
2005
- 2005-11-14 JP JP2005328915A patent/JP4309393B2/en not_active Expired - Fee Related
-
2006
- 2006-11-14 KR KR1020087014263A patent/KR100940372B1/en not_active IP Right Cessation
- 2006-11-14 WO PCT/JP2006/322661 patent/WO2007055379A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101310363B (en) | 2010-05-26 |
| WO2007055379A1 (en) | 2007-05-18 |
| JP2007134289A (en) | 2007-05-31 |
| KR20080069243A (en) | 2008-07-25 |
| JP4309393B2 (en) | 2009-08-05 |
| KR100940372B1 (en) | 2010-02-02 |
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