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WO2011138837A1 - Source lumineuse à émission de champ - Google Patents

Source lumineuse à émission de champ Download PDF

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Publication number
WO2011138837A1
WO2011138837A1 PCT/JP2010/057882 JP2010057882W WO2011138837A1 WO 2011138837 A1 WO2011138837 A1 WO 2011138837A1 JP 2010057882 W JP2010057882 W JP 2010057882W WO 2011138837 A1 WO2011138837 A1 WO 2011138837A1
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WO
WIPO (PCT)
Prior art keywords
emitter electrode
light source
emitter
electron
electric field
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.)
Ceased
Application number
PCT/JP2010/057882
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English (en)
Japanese (ja)
Inventor
一仁 西村
秀紀 笹岡
昌洋 大岡
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.)
KOCHI FEL CO Ltd
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KOCHI FEL CO Ltd
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 KOCHI FEL CO Ltd filed Critical KOCHI FEL CO Ltd
Publication of WO2011138837A1 publication Critical patent/WO2011138837A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
    • H01J63/06—Lamps with luminescent screen excited by the ray or stream

Definitions

  • the present invention relates to a field emission light source (Field Emission Light: hereinafter referred to as FEL) that can be used for illumination and display.
  • FEL Field Emission Light
  • FEL uses the light emission of the phosphor excited by electron beam irradiation, that is, cathodoluminescence, like a vacuum fluorescent display and a cathode ray tube, but a filament as an electron emission source. Instead, it is characterized by the use of a field electron-emitting device that emits electrons with a quantum effect.
  • Patent Document 1 discloses an electron emission electrode including diamond particles arranged on a substrate surface and a graphene sheet grown in a petal shape on the surface of the diamond particles. Since this electron emission electrode has excellent electron emission characteristics and is easy to manufacture, it is expected to be used as an FEL field electron emission device.
  • a phosphor layer in which electrical conductivity is added by a transparent conductive film or the like in a part of a vacuum sealed container formed of a material that is transparent to visible light such as glass is provided.
  • the phosphor layer By forming the phosphor layer and irradiating the phosphor layer with electrons from an electron emission source disposed inside the vacuum-sealed container, the phosphor emits light, and this light is taken out through the glass on the phosphor coating surface.
  • the FEL having such a structure is referred to as a transmitted light utilization type FEL.
  • a phosphor layer is formed on an electrode formed of a metal or the like, and light emission obtained by irradiating the phosphor layer with an electron beam is emitted from a portion other than the phosphor layer of the vacuum sealed container.
  • the FEL having such a structure is referred to as an electron-irradiated surface light emission type FEL.
  • This electron irradiation surface light emission type FEL is advantageous in that the light emission intensity of the phosphor particles on the electron irradiation surface side is higher than that of the transmitted light use type FEL and can be used without loss in the phosphor layer. It is.
  • the luminous efficiency of the phosphor basically decreases as the temperature rises.
  • the heat radiation structure is provided on the back surface of the phosphor plate to suppress the temperature rise of the phosphor plate. As a result, it is possible to emit light with higher luminance than the transmitted light utilizing FEL.
  • the anode layer is formed so that the wire-type electron-emitting device is substantially equidistant from the anode layer with respect to the inner wall of the vacuum sealed container to which the bowl-shaped phosphor layer is applied.
  • a method of mounting in a radial or spiral shape in the direction is disclosed.
  • Patent Document 3 since the structure of the electron-emitting device has a complicated shape such as a radial shape or a spiral shape, the moment of inertia around the fixed portion of the electron-emitting device increases, and acceleration is given to the FEL. Sometimes the stress generated in the fixed part is large, causing a problem in the strength of the electrode structure. Further, complication of the shape of the emitter electrode increases the area in which the emitter electrode covers the fluorescent plate, so that there is a problem that the extraction efficiency is reduced.
  • the present invention has been made in view of such a current situation, and an object of the present invention is to provide an FEL that can emit light uniformly, is efficient, and has an appropriate intensity.
  • a field emission light source provides: It has a container shape, and at least a part of the container-shaped tube wall is made of face glass formed of a material having a high transmittance with respect to visible light.
  • a vacuum sealed container in which an anode electrode constituted by a high member is disposed, and a phosphor layer is disposed on the anode electrode surface;
  • Each of the substrates is formed of a plurality of substrates each having a linear shape and having an electron-emitting material formed on a substantially half surface of the vacuum-sealed container.
  • An emitter electrode having a structure facing the phosphor layer side and parallel to each other, and having the same n-fold rotational symmetry as the number of substrates as viewed from the central axis direction, and a conductive material Formed and supporting the emitter electrode in the vacuum sealed container, and when applying a voltage to the emitter electrode, by relaxing the electric field strength of the surface of the electron emission material near the phosphor layer,
  • a power feeding part having a shape capable of uniformizing electron emission from the emitter electrode; It is characterized by providing.
  • the power supply section may have a circumscribed circle having a diameter larger than the diameter of the circumscribed circle of the emitter electrode in a cross-sectional view seen from the central axis (that is, the rotational symmetry axis) direction of the emitter electrode.
  • the structure on the emitter electrode side of the feeding part or the terminal part may be provided with a shape that increases the electric field concentration of itself and relaxes the electric field of the nearby emitter electrode.
  • the shape is such that the diameter of the circumscribed circle is partially in the vicinity of the connecting portion of the emitter electrode at the feeding portion or the end portion when viewed from the central axis direction of the emitter electrode.
  • the shape may be larger than the average outer diameter of the part main body.
  • the face glass may have a curvature that is convex from the inside of the vacuum-sealed container toward the atmosphere side.
  • the glass surface of the face glass may be subjected to a blurring process such as a ground glass process.
  • a transparent protective film that suppresses deterioration due to electron beam irradiation may be disposed on the surface of the phosphor layer.
  • the protective film may include any material of tin oxide / indium, zinc oxide, or tin oxide having a predetermined electric conductivity.
  • FIG. 1 It is a block diagram which shows the principal part of the electron irradiation surface light emission utilization type FEL which concerns on embodiment of this invention. It is a fragmentary sectional view of FIG. It is a figure which shows the side surface of electron irradiation surface light emission utilization type FEL. It is a figure which shows the structure of the principal part of the electron irradiation surface light emission utilization type FEL simplified in order to consider by simulation. It is a figure which shows x dependence of the electric field strength of the wire emitter surface. It is a figure which shows the result of having calculated the theta dependence of the electric field strength of the wire emitter surface.
  • FIG. 1 is a configuration diagram showing a main part of an FEL according to an embodiment of the present invention.
  • FIG. 2 is a partial cross-sectional view of FIG.
  • FIG. 3 is a diagram illustrating a side surface of the FEL.
  • the FEL includes a vacuum sealed container 10 that seals the inside to a vacuum, an emitter electrode 11 and a power feeding unit 12 that are disposed in the vacuum sealed container 10, and a fluorescence that is applied to a wall surface in the vacuum sealed container 10.
  • a body layer 13 and a transparent protective film 13A formed on the phosphor layer 13 are provided.
  • the vacuum-sealed container 10 is formed of glass having a high transmittance with respect to visible light, and includes a face glass 14 that forms a tip portion that emits light, a reflecting portion 15, and an insulator 16.
  • the face glass 14 may be planar as shown in FIG. 3A, but as shown in FIG. 3B, the face glass 14 protrudes from the inside of the vacuum sealed container 10 toward the atmosphere side in order to increase its strength. May have a structure. By adopting such a structure, the strength against the compressive stress in the atmosphere is improved, and accordingly, the thickness of the face glass 14 can be reduced, and at the same time, the pressure difference between the inside and outside of the vacuum sealed container 10 is applied to the face glass 14. The distortion which arises can be reduced and the leak in the junction part with the vacuum sealing container 10 which arises by the distortion can be suppressed.
  • the face glass 14 is subjected to a blurring process on the surface in order to diffuse the light from the phosphor layer 13.
  • the emitter electrode 11 has a configuration in which n (n is an integer of 2 or more) linear wire emitters 11 a are bundled, and the emitter electrode 11 is supported by the power feeding unit 12.
  • the reflecting portion 15 constitutes the wall surface of the vacuum sealed container 10 and also serves as an anode electrode, and is a metallic thin film formed on the inner wall surface of the glass vacuum sealed container 10, such as aluminum. It is made of metal and has a cylindrical shape.
  • the inner diameter of the reflecting portion 15 is small on the rear end side and large on the front end side.
  • the phosphor layer 13 is formed on the inner peripheral surface of the reflecting portion 15 by applying a zinc oxide phosphor (ZnO: Zn).
  • a transparent protective film 13A is formed on the surface of the phosphor layer 13 facing the emitter electrode 11.
  • the transparent protective film 13A suppresses deterioration of the phosphor layer 13 due to electron beam irradiation, and is made of any material of tin oxide / indium, zinc oxide, or tin oxide that is transparent and has high electrical conductivity. ing. By depositing these materials on the phosphor layer 13 with a thickness of 100 to 200 nm, the electrons emitted from the emitter electrode 11 reach the phosphor layer 13 and the light emitted from the phosphor layer 13 is not blocked. It becomes possible to take out. Further, the deterioration rate of the phosphor in the phosphor layer 13 can be greatly reduced.
  • a face glass 14 is bonded and fixed to the tip of the reflecting portion 15 with a low melting point frit glass or the like.
  • the rear end of the reflecting portion 15 is sealed with frit glass or the like and fixed to the front end side of the cylindrical insulator 16.
  • the insulator 16 is made of alumina.
  • a cylindrical power feeding portion 12 made of a conductive metal such as aluminum is disposed at the center of the insulator 16.
  • the electric power feeding part 12 penetrates the insulator 16, the front end side protrudes from the front end side of the insulator 16, and comprises the electric current introduction terminal. It should be noted that the same effect can be obtained even if the current introduction terminal is directly introduced into the vacuum sealed container 10 by using frit glass or the like without using the insulator 16.
  • the diameter of the power feeding unit 12 is larger than the diameter of the emitter electrode 11, the emitter electrode 11 is attached to the distal end side of the power feeding unit 12, and the central axis of the emitter electrode 11 is coaxial with the central axis of the cylindrical power feeding unit 12. So that it is supported.
  • the shape of the end portion on the emitter electrode 11 side of the power feeding unit 12 is provided with a structure that further increases the electric field concentration of itself in order to enhance the effect of relaxing the electric field of the nearby emitter electrode 11.
  • the emitter electrode 11 side end of the power feeding part 12 is viewed from the central axis of the mitter electrode 11, its diameter is partially larger than that of the power feeding part 12 body.
  • Each of the wire emitters 11a constituting the emitter electrode 11 is formed by arranging diamond particles on the surface of a nickel wire serving as a substrate and growing a petal-like graphene sheet as the electron emission material 17 on the surface of the diamond particles. is there.
  • a wire emitter 11a when the electron emission material 17 is formed by a technique such as CVD, it is difficult to provide a uniform electron emission material over the entire surface of the wire emitter 11a.
  • the wire emitter 11a is arranged so that the surface on which the electron emission material 17 is formed faces the phosphor layer 13. Further, when the number of wire emitters 11a is n, the section of the wire emitter 11a is arranged so as to have n-fold rotational symmetry when viewed from the central axis direction of the emitter electrode 11.
  • the n wire emitters 11 a are arranged n times symmetrically. Since the radius of curvature of the substrate is isotropic, ideally, no orientation occurs in the electric field strength and the resulting electron emission. However, in practice, it is difficult to make the central axes of the vacuum sealed container 10 and the emitter electrode 11 completely coincide with each other, and the deviation of the emitter electrode position biases the electron emission distribution and the resulting light emission in a specific direction. I will let you.
  • Such a bias in one direction of light emission not only detracts from the aesthetic appearance of the light emission but also causes a bias in the temperature distribution of the vacuum sealed container 10 to generate thermal stress in the container, and the vacuum sealed container 10 and the face. This may cause leakage at the joint portion of the glass 14.
  • n wire emitters 11a are arranged n times symmetrically, a portion where the electric field concentration is strong on the surface of the wire emitter 11a exists at a period of 360 / n °, and therefore the light emission is also 360 / n °.
  • the uneven emission of light in one direction caused by the misalignment between the central axes of the vacuum sealed container 10 and the emitter electrode 11 is alleviated.
  • the temperature distribution generated in the vacuum sealed container 10 becomes smaller than in the case where the number of the wire emitters 11a is one, and the thermal stress is accordingly reduced. Further, as will be described later, it is also possible to reduce the radial brightness fluctuation width by increasing n.
  • An electron emission material 17 is not formed at the tip of the emitter electrode 11 on the side not fixed to the power feeding portion 12, and is made of a cylindrical conductive material having a diameter larger than the circumscribed circle of the emitter electrode 11. It is terminated by the terminating portion 18.
  • the termination 18 has an effect of suppressing the electric field concentration generated at the end of the wire emitter 11 a and uniforming the electric field intensity around the emitter electrode 11 in the vicinity of the termination 18.
  • the area where electrons can be emitted on the emitter electrode 11 is smaller than that in the case where the terminal portion 18 is provided, and the light emission area is accordingly reduced.
  • the termination 18 may be provided with a structure that weakens the surrounding electric field by further increasing its own electric field concentration.
  • a structure in which the end of the terminal end 18 on the side connected to the emitter electrode 11 is partially increased in diameter relative to the main body of the terminal end 18 when viewed from the central axis of the emitter electrode 11 is provided. You can also.
  • a fixing jig for assembling the wire emitters 11a may be disposed at the center of the emitter electrode 11 (inside the group of wire emitters 11a). Even if such a jig is arranged, there is no electric field strength or only a weak electric field in the central portion surrounded by the conductive wire emitter 11a, and the internal structure has almost no influence on the electric field strength on the electron emission surface. Therefore, there is no change in the electron emission characteristics of the emitter electrode 11.
  • This FEL has two systems of current introduction terminals, one current introduction terminal is connected to the power feeding section 12, and the other current introduction terminal is connected to the reflection section 15 via a lead wire.
  • a negative voltage of, for example, -8 KV is applied to the current introduction terminal connected to the power feeding unit 12.
  • an electric field is applied between the emitter electrode 11 and the reflection portion 15, and electrons are emitted from the electron emission material 17 of the emitter electrode 11 toward the reflection portion 15.
  • the emitted electrons strike the phosphor layer 13 and cause the phosphor layer 13 to emit light.
  • Most of the light emitted from the phosphor layer 13 is directly transmitted through the face glass 14 and emitted to the outside.
  • other light while losing a part of its energy, repeats multiple reflections at the reflecting portion 15 or absorption and emission at the phosphor layer 13 and finally passes through the face glass 14 to the outside. To be emitted.
  • FIGS. 4A to 4D are diagrams showing the structure of the main part of the FEL simplified for consideration by simulation.
  • the diameter of the insulator 16 is 20 mm, and the length from the rear end to the tip of the cylindrical power supply part 12 penetrating the insulator 16 is 15 mm, of which 5 mm protrudes from the insulator 16.
  • the length from the tip of the power supply unit 12 to the tip of the emitter electrode 11 is 35 mm, the angle of the reflection unit 15 with respect to the emitter electrode 11 is 45 °, and the direction cosine with respect to the central axis of the reflection unit 15 is 35 mm. Is made to coincide with the surface formed by the end of the reflecting portion 15.
  • the electric field strength on the surface of the wire emitter 11a also changes depending on the shape of the terminal end 18 of the electrode tip, and the influence is easily expected to depend on the number and diameter of the wire emitters 11a.
  • the calculation is performed without providing the termination 18 in the emitter electrode 11, and the electric field strength change in the vicinity of the termination affected by the shape of the termination is excluded from the examination.
  • FIG. 5 shows a cross section taken along the line AA ′ in FIG.
  • a wire emitter 11a having a diameter d is arranged in the power feeding section 12 having a diameter D so as to have n-fold rotational symmetry without any gap, and the surface on which the electron emission material 17 of each wire emitter is formed faces the phosphor layer 13. Is directed to do.
  • an intersection of a straight line passing through the central axis C of the emitter electrode 11 and the central axis C ′ of the wire emitter 11a and the surface of the wire emitter is M, and a position on the surface of a certain wire emitter 11a on the AA ′ plane.
  • Is N, and an angle ⁇ MC′N formed by the straight line C′M and the straight line C′N is ⁇ .
  • a position on a straight line parallel to the central axis of the emitter electrode passing through M on the wire emitter 11 a is represented by a distance x from the surface of the power feeding unit 12.
  • FIG. 6 is a diagram showing a result of calculating the ⁇ dependence of the electric field intensity on the surface of the wire emitter 11a by using an electric field simulator Estat manufactured by Field Precision.
  • the test was performed assuming that a voltage of ⁇ 8 kV was applied to the unit 15.
  • the reason why the relative electric field strength that becomes the threshold value ⁇ th is 0.9 is that, in the typical electron emission material 17, when the electric field strength is 90% or less, the electron emission is 30% or less. This is because it becomes possible to easily distinguish the region as a non-light emitting boundary.
  • ⁇ is an angle with respect to the center C ′ of each wire emitter 11 a and there is a deviation from the center position C of the emitter electrode 11, but the deviation compared to the distance between the emitter electrode 11 and the reflecting portion 15. Is sufficiently small, ⁇ th ⁇ 2 ⁇ n can be regarded as the sum of the spread angles of the electron beams of the wire emitter 11a.
  • the threshold value ⁇ th monotonously decreases with respect to n, but the increase of n exceeds that, so that the total spread angle of the electron beam monotonously increases with respect to n.
  • Increasing the sum of the electron beam divergence angles also decreases the light and dark fluctuations of the radial emission intensity. Therefore, the result of FIG. 7 shows that the radial emission intensity fluctuation is increased by increasing n. It shows that it can be made smaller.
  • the reflector 15 is formed on the emitter electrode 11 of the prototype FEL. 3 shows an image obtained by photographing the light emitting surface from the direction of the face glass 14 when a voltage of ⁇ 8 kV is applied.
  • the emitter electrode 11 is composed of a plurality of wire emitters 11a, and the deposition surface of the electron emission material 17 of each wire emitter 11a is opposed to the reflecting portion 15. It is possible to emit light with no bias in the light emission direction. Further, by making the configuration of the power supply unit 12 relax the electric field intensity on the emitter electrode 11 in the vicinity thereof, it is possible to prevent a phenomenon in which the light emission intensity differs between the central part and the peripheral part of the reflection part 15. Is possible. Further, the emitter electrode 11 has a simple configuration in which the wire emitters 11a are bundled, has high light extraction efficiency, and the holding strength of the emitter electrode 11 is appropriate by reducing the moment of inertia around the fixed portion. Durability is obtained.
  • FIG. 9 is a diagram showing a structure of a main part of an electron irradiation surface emitting utilization type FEL that is simplified for consideration by simulation of the electron irradiation density on the surface on which the phosphor layer 13 is applied.
  • the diameter d of the wire emitter 11a is 1 mm
  • the number of wire emitters 11a, n is 6,
  • the electron emission material 17 having the electron emission characteristics shown in FIG. 10 is formed on the half surface of the phosphor layer 13 side. Yes.
  • FIG. 11 shows the change in electron irradiation density in the line segment from the point A on the anode side to A ′. Since the electron emission material 17 emits electrons by a quantum tunnel effect, as shown in FIG. 10, the electron emission density change is non-linear with respect to the change in electric field strength, and the electron emission density is reduced by a slight electric field strength. It changes a lot.
  • FIG. 12 is a diagram showing the state of the light emission state of the electron irradiation surface light emission using FEL, and the light emission state of the electron irradiation surface light emission type FEL having the same electrode structure as that shown in FIG. It shows the state seen from the glass side.
  • FIG. 13 is a diagram showing a light emission state of the electron irradiation surface light emission utilizing FEL when the face glass 14 is a ground glass. 12 is bonded to the electrode structure similar to that in the case of FIG. 12 described above, the face glass 14 whose surface is slid by virtue of honing is bonded, the inside of the vacuum sealing container 10 is evacuated, and then the sealing is performed.
  • the gradient of the emission intensity of the phosphor layer 13 in the ⁇ direction is relaxed by the light diffusion effect of the ground glass, and the light emission is made uniform.
  • uniform light emission can be achieved by producing an electron-irradiated surface-emission-type FEL using the technique of this embodiment using a plurality of wire emitters 14.

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Abstract

L'invention concerne une source lumineuse efficace à émission de champ qui peut émettre de la lumière uniformément. Une électrode d'émetteur (11) est constituée d'une pluralité de fils émetteurs (11a) dont les axes sont parallèles les uns aux autres. Chaque fil émetteur présente une forme linéaire. Un élément d'émission d'électrons est formé sur sensiblement une moitié de la surface de chaque fil émetteur vu dans la direction axiale. La surface de chaque fil émetteur (11a) sur laquelle est formé l'élément d'émission d'électrons est tournée vers une couche de luminophore (13) et est disposée de manière à ce que le nombre de symétries de rotation soit identique au nombre de fils émetteurs (11a). Des électrons peuvent donc être uniformément émis autour de l'électrode d'émetteur (11) de sorte que la lumière peut être uniformément émise dans la couche de luminophore. De plus, une unité formant source d'alimentation (12) destinée à alimenter l'électrode d'émetteur (11) présente une forme telle que l'intensité du champ électrique soit réduite dans la partie de l'élément d'émission d'électrons qui est proche de la couche de luminophore (13). La lumière est donc uniformément émise dans la direction longitudinale de l'électrode d'émetteur (11).
PCT/JP2010/057882 2010-05-06 2010-05-10 Source lumineuse à émission de champ Ceased WO2011138837A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-106798 2010-05-06
JP2010106798A JP2010282956A (ja) 2009-05-01 2010-05-06 電界放出型光源

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CN104008953A (zh) * 2013-02-27 2014-08-27 海洋王照明科技股份有限公司 一种场发射器件
CN104008952A (zh) * 2013-02-27 2014-08-27 海洋王照明科技股份有限公司 一种场发射器件

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JP2012084475A (ja) * 2010-10-14 2012-04-26 Kochi Fel Kk 電界放出型光源
JP2012133993A (ja) * 2010-12-21 2012-07-12 Kochi Fel Kk 電界放出型光源の製造方法及び電界放出型光源
JP2012134058A (ja) * 2010-12-22 2012-07-12 Kochi Fel Kk 炭素膜つきワイヤ型基板、炭素膜つきワイヤ型基板の製造方法、及び、電界放出型光源
CN103972036B (zh) * 2013-01-29 2016-05-04 海洋王照明科技股份有限公司 一种场发射光源

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WO2006073017A1 (fr) * 2005-01-05 2006-07-13 Dialight Japan Co., Ltd. Appareillage et procede pour fabriquer un film de carbone par depot chimique en phase vapeur sous plasma et film de carbone
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JP2009146816A (ja) * 2007-12-17 2009-07-02 Hitachi Metals Ltd 冷陰極電子源およびフィールドエミッションランプ
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104008953A (zh) * 2013-02-27 2014-08-27 海洋王照明科技股份有限公司 一种场发射器件
CN104008952A (zh) * 2013-02-27 2014-08-27 海洋王照明科技股份有限公司 一种场发射器件

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