CN101325142A - Cold-cathode discharge lamp - Google Patents

Cold-cathode discharge lamp Download PDF

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Publication number
CN101325142A
CN101325142A CNA2008100996303A CN200810099630A CN101325142A CN 101325142 A CN101325142 A CN 101325142A CN A2008100996303 A CNA2008100996303 A CN A2008100996303A CN 200810099630 A CN200810099630 A CN 200810099630A CN 101325142 A CN101325142 A CN 101325142A
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CN
China
Prior art keywords
cold
electrode
discharge lamp
cathode discharge
oxide layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2008100996303A
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Chinese (zh)
Inventor
武田雄士
筒井直树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Harison Toshiba Lighting Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harison Toshiba Lighting Corp filed Critical Harison Toshiba Lighting Corp
Publication of CN101325142A publication Critical patent/CN101325142A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/09—Hollow cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps

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  • Discharge Lamp (AREA)

Abstract

The invention provides a cold cathode discharge lamp with low power consumption and low cost, which comprises a discharge capacitor 1 with an internal discharge space 11, dielectric encapsulated in the discharge space 11, and a pair of electrodes 3a1 and 3b1 oppositely arranged in the discharge space 11, and oxidation layers 4 of electrode materials formed on the surfaces of the electrodes 3a1 and 3b1. The material of the electrodes 3a1 and 3b1 is preferably Ni. In addition, the depth T of the oxidation layer 4 satisfies the following relationship, preferably 10nm<=T<=100mum, more preferably 1mum<=T<=100mum.

Description

Cold-cathode discharge lamp
Technical field
The present invention relates to the cold-cathode discharge lamp that backlight adopted of the LCD etc. of LCD TV or notebook computer.
Background technology
At present, as the light source that backlight adopted of LCD etc., because the low advantage of cost mainly is a cold-cathode discharge lamp.In the cold-cathode discharge lamp, adopt the electrode of opening the so-called cup-shaped of being put down in writing in the 2005-26139 communique (patent documentation 1) that bottom tube-like is arranged as the Japan Patent spy usually.This electrode can even therefore electrode size is little, can guarantee that also electrode surface area is big with the inner surface of the electrode of cup-shaped and outer surface as the surface of electrode.Therefore, cathode fall can be reduced, power consumption can be controlled.
As mentioned above, the low power consumption of cold-cathode fluorescence lamp special requirement quantizes.Therefore, Japanese patent laid-open 11-273617 communique (patent documentation 2), Japan Patent spy open in 2000-133200 communique (patent documentation 3) etc., in order to control power consumption, proposed to be formed with electronic emission material, be the cold-cathode fluorescence lamp of emitter at electrode.
Patent documentation 1: the Japan Patent spy opens the 2005-26139 communique
Patent documentation 2: Japanese patent laid-open 11-273617 communique
Patent documentation 3: the Japan Patent spy opens the 2000-133200 communique
Summary of the invention
If form emitter at electrode, then cathode fall reduces, and can control power consumption, but can't avoid the increase of manufacturing process and cost to rise.
Therefore, the object of the present invention is to provide low power consumption and cold-cathode discharge lamp cheaply.
To achieve these goals, the inventor has done various researchs back and has found by making the electrode surface oxidation on one's own initiative, the fact that cathode fall descends, thereby the present invention has been proposed.
Promptly, cold-cathode discharge lamp of the present invention possesses the discharge vessel that has discharge space in inside, is enclosed the discharge medium of described discharge space and the pair of electrodes of subtend configuration in described discharge space, it is characterized in that, be formed with the oxide layer of described electrode material on the surface of described electrode.
In addition, cold-cathode discharge lamp of the present invention is characterised in that the oxygenation efficiency on the surface of described electrode better is more than 75% more than 40%.
In addition, cold-cathode discharge lamp of the present invention is characterised in that described electrode is formed by the metal of chosen from Fe Fe, nickel, molybdenum Mo, niobium Nb, tungsten W, tantalum Ta, aluminium Al or their alloy.
Therefore if employing the present invention by making the electrode surface oxidation on one's own initiative, can reduce cathode fall, can provide low power consumption and cold-cathode discharge lamp cheaply.
Description of drawings
Fig. 1 is the overall diagram that is used to illustrate the cold-cathode discharge lamp of the 1st kind of execution mode of the present invention.
Fig. 2 is the figure that is used to illustrate electrode mechanism.
Fig. 3 is the figure that is used to illustrate the variation of the cathode fall when changing lamp current for the lamp that possesses the nickel electrode and be formed with the nickel electrode of oxide layer.
Fig. 4 is the figure that is used to illustrate the variation of the cathode fall when changing lamp current for the lamp that possesses molybdenum Mo electrode and be formed with the molybdenum Mo electrode of oxide layer.
Fig. 5 is the figure that is used to illustrate the variation of the cathode fall when changing lamp current for the lamp that possesses tungsten W electrode and be formed with the tungsten W electrode of oxide layer.
Fig. 6 is the variation 1 of electrode.
Fig. 7 is the variation 2 of electrode.
Fig. 8 is the variation 3 of electrode.
The explanation of symbol
1: discharge vessel, 2: luminescent coating, 3a, 3b: electrode mechanism, 3a1,3b1: electrode, 3a2,3b2: inner lead, 3a3,3b3: outside lead, 4: oxide layer.
Embodiment
(the 1st kind of execution mode)
Below, describe with reference to accompanying drawing for the cold-cathode discharge lamp of embodiments of the present invention.Fig. 1 is the overall diagram that is used to illustrate the cold-cathode discharge lamp of the 1st kind of execution mode of the present invention.
The container of cold-cathode discharge lamp is made of the discharge vessel 1 of for example hard glass system.Discharge vessel 1 is elongated cylindrical form, and its inside is formed with discharge space 11.Enclosing in the discharge space 11 has mercury and as the neon of rare gas., also can also enclose argon here, form mist for the startability that improves lamp.In addition, the inner surface of discharge vessel 1 is formed with luminescent coating 2.As luminescent coating 2, except with R (red), G (green), the luminous short wavelength's fluorophor of B (indigo plant), can also use the three-wavelength fluorophor that mixed RGB etc. according to the target purposes.In addition, luminescent coating 2 can be formed up near the both ends of discharge vessel 1.
Discharge vessel 1 sealed at both ends has electrode mechanism 3a, 3b.As shown in Figure 2, electrode mechanism 3a, 3b are by electrode 3a1,3b1, and inner lead 3a2,3b2 and outside lead 3a3,3b3 constitute, and engage integratedly by resistance welded or laser welding etc.
Electrode 3a1,3b1 are tabular, are formed by the metal of chosen from Fe Fe, nickel, molybdenum Mo, niobium Nb, tungsten W, tantalum Ta, aluminium Al or their alloy.Wherein, consider the difficulty and the effect of the formation of oxide layer 4 described later, preferred nickel.
Inner lead 3a2,3b2 are bar-shaped, and the leading section of discharge space 11 sides is formed with tabular the tabular surface that face engages that is used for electrode 3a1,3b1.As the material of inner lead 3a2,3b2, can use fusing point to be lower than the metal of electrode material, for example cobalt Co, copper Cu line, nickel etc.In addition, as present embodiment under inner lead 3a2,3b2 glass-sealed situation, especially preferably near the cobalt Co of the coefficient of thermal expansion of glass for the both ends of discharge vessel 1.
Outside lead 3a3,3b3 lead-in wire for being electrically connected with starting circuit.Therefore, it is desirable to the conductivity good metal, the Dumet copper-clad iron-nickel alloy wire of the copper Cu that for example has been covered is suitable for iron Fe nickel alloy.
The surface that becomes discharge face of electrode 3a1,3b1 is formed with the oxide layer 4 of its electrode material.In addition, " discharge face " is meant the electrode surface of the effect of playing electrode, promptly forms the electrode surface of negative glow plasma at work.As the formation scope of oxide layer 4, it is desirable to be formed at the whole electrode surface that becomes discharge face, but then,, it is desirable to not make its oxidation for inner lead 3a2,3b2.In addition, in order to suppress the splash of the oxide layer in useful life, oxide layer 4 it would be desirable and forms the surface equally, promptly uniform state.Its surface uniformly state is meant that surface roughness Ra for example reaches the state about 1nm～10 μ m.
Here, the formation method to oxide layer 4 describes.Oxide layer 4 gets by making the electrode surface forced oxidation.That is, in atmosphere, heat, can form oxide layer 4 at electrode surface by using thermals source such as burner.At this moment, thickness of oxide layer 4 etc. can be adjusted by treatment temperature or processing time.In addition, pass through nickel oxide NiO, the Ni of evaporations such as plasma CVD or hot CVD if for example use on the surface of nickel electrode as the oxide of its electrode material 2O 3Method, then can form firm and stable oxide layer 4 at electrode surface.
Below, an embodiment of the cold-cathode discharge lamp of present embodiment is shown.In addition, below Shuo Ming test unless otherwise specified, then size, material etc. all carry out based on this mode.
(embodiment)
Discharge vessel 1: hard glass system, total length=110mm, external diameter=4.0mm, internal diameter=3.0mm;
Discharge medium: mercury=5.0mg, neon=8.0kPa;
The three-wavelength fluorophor of luminescent coating 2:RGB;
Electrode 3a1,3b1: nickel (Ni) system, length L=5.2mm, width W=1.7mm, thickness D=0.1mm;
Inner lead 3a2,3b2: cobalt (Co) system, line footpath=0.6mm;
Outside lead 3a3,3b3: Dumet copper-clad iron-nickel alloy wire system, line footpath=0.4mm;
Oxide layer 4: nickel oxide (NiO, Ni 2O 3), thickness T=10 μ m.
Fig. 3 is the figure of the variation of the cathode fall when being used for explanation and changing lamp current for the lamp that possesses nickel (Ni) electrode and be formed with nickel (Ni) electrode of oxide layer, Fig. 4 is the figure of the variation of the cathode fall when being used for explanation and changing lamp current for the lamp that possesses molybdenum (Mo) electrode and be formed with molybdenum (Mo) electrode of oxide layer, and Fig. 5 is the figure of the variation of the cathode fall when being used for explanation and changing lamp current for the lamp that possesses tungsten (W) electrode and be formed with tungsten (W) electrode of oxide layer.Experimental condition is lamp current=2～8mA, frequency=35kHz, and oxide layer 4 is respectively by forming in the about 3 seconds forced oxidation of about 300 degree heating in atmosphere.
By Fig. 3～5 as can be known, for the electrode of any material of nickel (Ni), molybdenum (Mo), tungsten (W), forced oxidation the peak value of cathode fall of electrode all descend.Particularly for nickel (Ni), cathode fall significantly descends, and compares with the situation that does not form oxide layer 4, and cathode fall descends more than about 50V.Cathode fall decline is considered to because Malter effect by forming oxide layer 4 at electrode surface as mentioned above.That is, think that cation is attached to the oxide layer surface, cathode fall is owing to the electric field effects of its generation descends.Here, opening 2006-12612 communique and Japan Patent spy as the Japan Patent spy opens in the 2007-73407 communique and puts down in writing, because make reasons such as its anti-splash easily, did one's utmost to avoid the oxidation of electrode material self in the past always, in this regard, cathode fall is to break through the great discovery of general knowledge in the past by the fact that descends in electrode surface formation oxide layer 4 on the contrary.
In addition, though not shown, for the electrode that the metal or alloy by iron (Fe), niobium (Nb), tantalum (Ta), aluminium (Al) forms,, confirm that also cathode fall reduces by forming oxide layer 4 by the test same with Fig. 3～5.
In addition, therefore the thickness T of the oxide layer 4 of electrode surface better is to be controlled in the preferred range owing to the characteristic to lamp exerts an influence.According to inventor's research, satisfy 10nm≤T≤100 μ m if find the thickness T of oxide layer 4, then can reduce cathode fall, be preferred therefore.In addition, if the thickness T of oxide layer 4 satisfies 1 μ m≤T≤100 μ m, then the increased functionality as insulator of oxide layer 4 can suppress export license, is preferred therefore.The thickness T of this oxide layer 4 can be measured by x-ray photoelectron spectroscopy analytical equipment (XPS).
In addition, measure the volume scope of diameter 500 μ m, the about 10nm of the degree of depth of optional position of the nickel that is formed with oxide layer (Ni) electrode surface shown in Figure 3 by XPS after, be confirmed to be Ni and be 19.1%, NiO is 40.4%, Ni 2O 3It is 40.5% ratio.Here, if the toatl proportion of contained all oxides is defined as " oxygenation efficiency " in the volume that will stipulate, then the oxygenation efficiency under this situation is 80.9%.
Similarly, the molybdenum that is formed with oxide layer (Mo) electrode for shown in Figure 4 confirms Mo, MoO in the described specified volume on its surface 2And MoO 3In addition, the tungsten that is formed with oxide layer (W) electrode for shown in Figure 5 detects W, WO and W XO Y(oxide of the tungsten except that monovalence).The oxygenation efficiency target voltage drop of such electrode surface has effect, so the oxygenation efficiency of electrode surface better is more than 40%, is more preferably more than 75%.
Therefore, in the 1st kind of execution mode, by form the oxide layer 4 of electrode material at the whole electrode surface that becomes discharge face of electrode 3a1,3b1, cathode fall descends, and can control power consumption.In addition, oxide layer 4 can easily form, and therefore can implement the present invention at low cost.As electrode 3a1,3b1, can use the metal or alloy of chosen from Fe (Fe), nickel (Ni), molybdenum (Mo), niobium (Nb), tungsten (W), tantalum (Ta), aluminium Al, the good especially nickel (Ni) that is to use.
In addition, the thickness T of oxide layer 4 satisfies 10nm≤T≤100 μ m, thereby can obtain stable effect of the present invention, further satisfies 1 μ m≤T≤100 μ m, thereby can suppress export license.
In addition, embodiments of the present invention are not limited to aforesaid way, for example can followingly change.
As present embodiment, form under the situation of electrode 3a1,3b1, as shown in Figure 6 and Figure 7, it is desirable to by the bending plate-shape metal or form spiral-shapedly, the surface area that forms oxide layer 4 is increased by plate-shape metal.At this moment, be more preferably and make it coarse by sandblast etc., perhaps be formed on pit that thickness direction do not penetrate, be so-called indenture, guarantee that electrode surface area is big tabular.
In addition, as electrode 3a1,3b1, being not limited to tabularly, can be tubular, cup-shaped or bar-shaped.In addition, under the situation of cup-shaped, as shown in Figure 8, better be to form oxide layer 4 at inner surface and outer surface.

Claims (18)

1. cold-cathode discharge lamp, possess the discharge vessel that has discharge space in inside, enclosed the discharge medium of described discharge space and the pair of electrodes of subtend configuration in described discharge space, it is characterized in that, be formed with the oxide layer of described electrode material on the surface of described electrode.
2. cold-cathode discharge lamp as claimed in claim 1 is characterized in that, the oxygenation efficiency on the surface of described electrode better is more than 75% more than 40%.
3. cold-cathode discharge lamp as claimed in claim 2 is characterized in that, described electrode is formed by the metal of chosen from Fe Fe, nickel, molybdenum Mo, niobium Nb, tungsten W, tantalum Ta, aluminium Al or their alloy.
4. cold-cathode discharge lamp as claimed in claim 3 is characterized in that, described oxide layer is formed at the whole electrode surface that becomes discharge face, and its surface roughness Ra reaches 1nm～10 μ m.
5. cold-cathode discharge lamp as claimed in claim 1 is characterized in that, described thickness of oxide layer T satisfies 10nm≤T≤100 μ m, better is 1 μ m≤T≤100 μ m.
6. cold-cathode discharge lamp as claimed in claim 1 is characterized in that, described discharge medium is mercury and neon.
7. cold-cathode discharge lamp as claimed in claim 6 is characterized in that, described pair of electrodes is tabular electrode.
8. cold-cathode discharge lamp as claimed in claim 7 is characterized in that, the oxygenation efficiency on the surface of described electrode better is more than 75% more than 40%.
9. cold-cathode discharge lamp as claimed in claim 8 is characterized in that, described electrode is formed by the metal of chosen from Fe Fe, nickel, molybdenum Mo, niobium Nb, tungsten W, tantalum Ta, aluminium Al or their alloy.
10. cold-cathode discharge lamp as claimed in claim 9 is characterized in that, described oxide layer is formed at the whole electrode surface that becomes discharge face, and its surface roughness Ra reaches 1nm～10 μ m.
11. cold-cathode discharge lamp as claimed in claim 10 is characterized in that, described discharge medium also comprises argon gas.
12. cold-cathode discharge lamp as claimed in claim 11 is characterized in that, described thickness of oxide layer T satisfies 10nm≤T≤100 μ m, better is 1 μ m≤T≤100 μ m.
13. cold-cathode discharge lamp as claimed in claim 6 is characterized in that, described pair of electrodes is the electrode of cup-shaped.
14., it is characterized in that the oxygenation efficiency on the surface of described electrode better is more than 75% more than 40% as claim 13 described cold-cathode discharge lamps.
15. cold-cathode discharge lamp as claimed in claim 14 is characterized in that, described electrode is formed by the metal of chosen from Fe Fe, nickel, molybdenum Mo, niobium Nb, tungsten W, tantalum Ta, aluminium Al or their alloy.
16. cold-cathode discharge lamp as claimed in claim 15 is characterized in that, described oxide layer is formed at the whole electrode surface that becomes discharge face, and its surface roughness Ra reaches 1nm～10 μ m.
17. cold-cathode discharge lamp as claimed in claim 16 is characterized in that, described discharge medium also comprises argon gas.
18. cold-cathode discharge lamp as claimed in claim 17 is characterized in that, described thickness of oxide layer T satisfies 10nm≤T≤100 μ m, better is 1 μ m≤T≤100 μ m.
CNA2008100996303A 2007-06-14 2008-06-13 Cold-cathode discharge lamp Pending CN101325142A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007157712 2007-06-14
JP2007157712 2007-06-14

Publications (1)

Publication Number Publication Date
CN101325142A true CN101325142A (en) 2008-12-17

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CNA2008100996303A Pending CN101325142A (en) 2007-06-14 2008-06-13 Cold-cathode discharge lamp

Country Status (4)

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JP (1) JP2009021225A (en)
KR (1) KR20080110516A (en)
CN (1) CN101325142A (en)
TW (1) TW200917317A (en)

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Publication number Publication date
JP2009021225A (en) 2009-01-29
TW200917317A (en) 2009-04-16
KR20080110516A (en) 2008-12-18

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Open date: 20081217