JP2013073857A - Reflection type field emission lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new field emission lamp with better efficiency.SOLUTION: The reflection type field emission lamp comprises an electrode emission source formed in a vacuum space, a gate electrode and a phosphor layer. The electron emission source is formed on a surface of a translucent member, and the gate electrode is formed so as to cover the electrode emission source at an interval. The phosphor layer is formed on a surface of a conductive member opposed to the gate electrode. The electrode emission source forms an electric field form and to the gate electrode to emit electron beam. The phosphor layer forms an electric field from and to the gate electrode, so that the electron beam collides to excite and emit light. The electron emission source is arranged to form a space for passing the emitted light beam to the surface of the translucent member. The emitted light beam is extracted to the outside through the space.

Description

  The present invention relates to a reflective field emission lamp.

  A field emission lamp (hereinafter abbreviated as “FEL”) has a field emission cathode array (FEA) and an anode substrate coated with a phosphor facing each other in a vacuum vessel, and accelerates electrons to excite the phosphor to emit light. Light source. Features of FEL are (1) mercury-free, (2) flat light emission and front light emission, and the effective total luminous flux of the tube fluorescent lamp is significantly lower than the total luminous flux of the display, whereas the effective total luminous flux and total The luminous flux is almost the same, (3) An irregular light source (curved surface, etc.) other than flat and tube-shaped is possible, (4) Resistant to temperature changes and humidity, (5) High tolerance of emitter defects without the need for XY matrix formation It has features such as low cost.

  FIG. 1 is a diagram for explaining the principle of such FEL. A voltage Vk is applied between the field emission electron source 2 and the gate 4 to form an electric field. The surface of the electron source 2 is uneven when viewed microscopically. When a voltage is applied, the electric field concentrates on the convex portion, and electrons 8 are ejected by the quantum mechanical tunnel effect. A voltage Va is also applied between the gate 4 and the fluorescent plate 6 to form an electric field, the electrons 8 are accelerated and collide with the fluorescent plate 6, and the fluorescent plate 6 emits light by excitation.

  Note that the present inventors are aware of the following prior art documents related to FEL.

Japanese Patent Laid-Open No. 10-255695 “Illumination Device and Light-Emitting Device” (Publication Date: September 25, 1998) Patent Document 1 discloses “a combination of a light-transmitting cathode plate 6 and a light-emitting surface plate 10. The structure of the FEL is disclosed, in which the light-emitting surface substrate 7 constituting the structure is extended and the reflection layer 11 is formed on the back surface thereof to form a mirror. Japanese Patent Laid-Open No. 2008-91279, “Light-Emitting Device” (Publication Date: April 17, 2008) Patent Document 2 discloses that “... Anode electrode 5 is provided, and cathode electrode 6 is provided on both sides of anode electrode 5. An electric field is applied to the electron emission source 8 to emit an electron beam, and the phosphor layer 7 is evenly dropped into a parabolic shape to excite and emit the phosphor layer 7 ”(summary). Has been. Japanese Patent Laid-Open No. 2009-117299, “Light Emitting Device” (Publication Date: May 28, 2009) Patent Document 3 states that “the cathode electrode 10 is disposed on the periphery of the light transmitting portion 30 and the anode electrode 15 is made transparent. An FEL configuration is disclosed that “the surface 16a of the phosphor 16 disposed in a region facing the light portion 30 and disposed in the upper layer of the anode electrode 15 is formed as a concave surface”. Japanese Patent Application Laid-Open No. 2010-282156, “Field Emission Light Source” (Release Date: December 16, 2010) Patent Document 4 states that “the emitter electrode 11 is composed of a wire emitter 11a, and the reflecting portion 15 also serves as an anode electrode”. The inner diameter of the reflecting portion 15 is small on the rear end side and larger on the front end side ”(summary, paragraph 0026).

Saburo Uemura, Junko Yoya “3 Nanoelectronic Materials 3-1 Carbon Nanotube Field Emission Display” Journal of IEICE Vol.85, No.11, PP.814-818 (November 2002) It is a structure schematic diagram explaining the lamp type device 100 described in patent document 1. FIG. The lamp-type device 100 has a triode structure including a cathode electron emission source 20, a grid electrode (corresponding to a gate electrode) 40, and an anode phosphor screen 60. The electron emission source 20 is a multi-walled carbon nanotube (multi-walled CNT) cathode formed by a screen printing method, and is covered with a grid electrode 40. The phosphor screen 60 is formed by forming a phosphor film 60 on a flat surface of glass 160 having a flat lens shape on one side by a screen printing method, and an aluminum thin film (also referred to as “metal back layer”) 70 on the surface. It is formed by vacuum deposition. Since the phosphor film 60 does not have sufficient conductivity, the aluminum thin film 70 avoids a charge accumulation phenomenon (also referred to as “charge-up”) and maintains the potential of the phosphor screen.

  When a positive voltage Vk is applied between the cathode electron source 20 and the grid electrode 40 and a strong electric field is generated on the surface of the multilayer CNT cathode 20, electrons 80 are ejected. The electrons 80 emitted from the electron source 20 are accelerated in the vacuum space, penetrate the aluminum thin film 70 to which the positive voltage Vk is applied, collide with the phosphor 60, and the phosphor 60 emits light by electron beam excitation.

  In this application document, for the sake of easy understanding, the electron beams 8 and 80 are shown by solid lines with arrows, and the emitted light beams 14 and 140 are shown by broken lines with arrows.

  Patent Document 1 is characterized in that the light emitting surface substrate 7 constituting the light emitting surface plate 10 is extended. In Patent Document 2, the distance between the electron beam source and the phosphor screen is set to be a certain amount in order to control the deflection of the electron beam. In addition, Patent Document 3 is characterized in that the surface 16a of the phosphor 16 is formed as a concave surface, and in Patent Document 4, The emitter electrode is wire-shaped and the shape of the reflecting portion is bowl-shaped, which is different from the characteristics of the reflective FEL according to the present invention described below. Furthermore, the lamp-type device of Non-Patent Document 1 is a transmissive FEL.

  The lamp type device 100 shown in FIG. 2 is referred to as a “transmission type FEL” because the route from the electron beam 80 to the light emission 140 passes through the phosphor 60. In the transmission type FEL, since the aluminum thin film 70 exists on the surface of the phosphor film 60, an energy loss of an electron beam occurs when passing through this. In addition, although the phosphor film 60 generates considerable heat due to the collision of the electron beam 80, the back surface of the phosphor film 60 is the glass 160 having poor thermal conductivity, and the back surface of the glass 160 is convective cooling with exposure to the atmosphere. There is a problem that the cooling efficiency of the phosphor film 60 is poor.

  Accordingly, an object of the present invention is to provide a novel FEL with higher efficiency.

  In view of the above object, a reflective field emission lamp according to the present invention is a reflective field emission lamp including an electron emission source formed in a vacuum space, a gate electrode, and a phosphor layer. Is formed on the surface of the translucent member, the gate electrode is formed to cover the electron emission source with a gap, and the phosphor layer is disposed to face the gate electrode. The electron emission source has an electric field formed between the gate electrode and the electron emission source to emit an electron beam, and the phosphor layer has an electric field between the gate electrode and the gate electrode. Formed and excited to emit light when the electron beam collides, and the electron emission source is disposed so as to form a space through which the emitted light beam passes on the surface of the translucent member. Special Passes through the scan is taken out to the outside.

  Furthermore, in the reflective field emission lamp, the translucent member may be a part of a container surrounding the vacuum space.

  Furthermore, in the reflective field emission lamp, the translucent member may be disposed in the vacuum space separately from the container surrounding the vacuum space.

  Furthermore, in the reflective field emission lamp, the electron emission source is formed in an annular shape, a frame shape (frame shape), or an elliptical ring shape on the surface of the translucent member, and the emission light beam is passed through the inside thereof. A space may be formed.

  Further, in the reflective field emission lamp, the electron emission source is formed on the surface of the translucent member in the form of a line spaced from each other, and the distance becomes a space for passing the emitted light beam. It may be.

  Further, in the reflective field emission lamp, the electron emission source may be formed by applying an electronic material to the surface of the wire.

  Furthermore, in the reflective field emission lamp, the electron emission source may be formed of carbon nanotubes.

  Furthermore, in the reflective field emission lamp, the conductive member may be formed of a metal substrate, and the phosphor layer may be formed on the surface of the metal substrate.

  Furthermore, in the reflective field emission lamp, the electron emission source may be formed with a certain size, whereas the phosphor layer may be formed with a spot size.

  According to the present invention, it is possible to provide a more efficient new FEL.

FIG. 1 is a diagram for explaining the principle of FEL. FIG. 2 is a structural schematic diagram illustrating the lamp-type device described in Non-Patent Document 1. FIG. 3 is a schematic diagram showing the structure of the reflective FEL according to the first embodiment. FIG. 4 is a diagram illustrating a transmissive FEL. FIG. 5 is a diagram for explaining a reflective FEL. FIG. 6 is a diagram for explaining the drawbacks of the reflective FEL. FIG. 7 is a diagram for explaining a drawback of oblique irradiation of an electron beam. FIG. 8 is a diagram for explaining the FEL structure in which the reflection type FEL defect of FIG. 7 is eliminated, and further for explaining the defect of the reflection type FEL. FIG. 9 is a diagram for explaining a reflective FEL in which the drawbacks of FIG. 8 are eliminated. FIG. 10 is a diagram for explaining a reflective FEL according to the second embodiment. FIG. 11 is a diagram for explaining a reflective FEL according to the third embodiment.

  Hereinafter, embodiments of a reflective field emission lamp (reflective FEL) according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted. In addition, it should be understood that this embodiment is an example for explaining the present invention and does not limit the technical scope of the present invention.

[First Embodiment]
FIG. 3A is a schematic diagram showing the structure of the reflective FEL 20-1 according to the first embodiment, and FIG. 3B shows the electron emission source 2-1 and the phosphor of the reflective FEL 20-1. It is a figure explaining the relationship of a layer (it is also called a "phosphor film | membrane" or a "light-emitting body") 6-1. The reflection type FEL 20-1 has an annular cathode electron emission source 2-1, an annular gate electrode 4 covering the electron emission source, and an internal space 12 a of a container 12 whose front surface is formed of a translucent member 16. Phosphor substrates 6-1 and 18-1 are accommodated as anode electrodes. The internal space 12a of the container 12 is maintained in a vacuum.

  The translucent member 16 is typically heat-resistant glass (for example, Pyrex (registered trademark)). However, the translucent member 16 may be other glass or other translucent member that can be hermetically sealed. The container 12 is typically the same material as the translucent member 16 or a material having a thermal expansion coefficient close to that of the translucent member 16 and is a rigid member capable of hermetically sealing.

  The cathode electron emission source 2-1 typically has a ring shape of 20 mmφ, and was formed by applying an electron emission source material on the surface of a substrate wire diameter of 0.5 mm. However, as with the FEL 100 in FIG. 2, a multi-walled carbon nanotube (multi-walled CNT) cathode typically formed in an annular shape on the surface of the translucent member 16 by a screen printing method may be used. However, the electron emission source 2-1 may use another cathode that can efficiently emit electrons. The shape of the electron emission source 2-1 is not limited to an annular shape. As will be described later, the purpose of the annular shape is to form a space portion that does not interfere with the emitted light beam 14 from the phosphor layer. For example, a triangular, square, or other polygonal frame shape (frame shape), An elliptical ring shape obtained by deforming an annular shape may be used.

  The circular shape of the illustrated electron emission source 2-1 is one electron emission source, but is not limited thereto. A plurality of arc-shaped (arc-shaped) electron emission sources may be connected and arranged in an annular shape to form an electron emission source. Further, each of the electron emission sources may be formed of small pieces having an arbitrary shape such as a rectangle or a circle, and the electron emission source may be formed by arranging these small pieces in an annular shape.

  The gate electrode 4-1 is typically a copper mesh member (mesh) or a lattice member (grid). However, the shape of the gate electrode 4-1 may be any shape that allows electrons to pass efficiently, such as other porous shapes and slit shapes. The shape and arrangement of the gate electrode 4-1 are determined according to the size of the electron emission source 2-1. Regarding the material of the gate electrode 4-1, another conductive member such as metal or an insulator whose surface is subjected to conductive treatment may be used.

  The phosphor substrates 6-1 and 18-1 of the anode electrode have a phosphor layer 6-1 formed on the surface of a nickel (Ni) substrate 18-1 having a thickness of 0.5 mm by screen printing. The dimension of the phosphor layer is a circle of 3 mmφ. However, the plate thickness and material of the substrate 18-1 are not limited to this, and may be any desired plate thickness, and the material may be an electrically conductive member, for example, another type of metal substrate, or a conductive treatment of the surface. It may be an insulator.

  The phosphor layer 6-1 is conventionally known, and emits light by electron beam excitation when an electron beam collides. The method for forming the phosphor layer 6-1 on the substrate 18-1 is not limited to the screen printing method, and the film may be formed by vacuum deposition or the like.

  The distance between the electron emission source 2-1 and the gate electrode 4-1 is about 0.5 to 1.0 mm, the voltage applied between them is about 1 to 2 kV, and a strong electric field is formed. The distance between the gate electrode 4-1 and the phosphor layer 6-1 is several millimeters, and the voltage applied between them is about 8 kV. Each applied voltage may be a pulse voltage to make the electron beam uniform and light emission uniform. The spacing and voltage values shown here are exemplary and may be other suitable values.

  The light emission of the reflection type FEL 20-1 shown in FIG. 3 is obtained when a positive voltage Vk is applied between the cathode electron emission source 2-1 and the gate 4-1, and a strong electric field is generated in the cathode electron emission source 2-1. Jumps out. A part of the electrons 8 emitted from the electron emission source 2-1 is captured by the gate 4-1, but most of the electrons 8 are accelerated in the vacuum space 12a and are on the surface of the Ni substrate 18-1 to which the positive voltage Va is applied. The phosphor layer 6-1 collides with the phosphor film 6-1, and the phosphor layer 6-1 emits light by electron beam excitation, and the emitted light 14 passes outside through the space inside the annular electron emission source of the translucent member 16. Irradiate. The light emission 14 is generally visible light, but is not limited thereto. The light emission 14 may be invisible ultraviolet rays or the like.

(Modification)
In the reflective FEL 20-1 shown in FIG. 3, the electron emission source 2-1 is formed on the translucent member 16 on the front surface of the container 12. However, it is not limited to this. The electron emission source 2-1 may be formed on a separate translucent member disposed in the internal space 12 a of the container 12.

(Characteristics etc. of the reflective FEL shown in FIG. 3)
Next, features of the reflective FEL 20-1 shown in FIG. 3 will be described with reference to FIGS. Compared with the structure of the transmissive FEL 100 shown in FIG. 2, the FEL 20-1 shown in FIG. 3 is (1) a reflection type, and (2) a phosphor structure (specifically, the absence of an aluminum thin film, It is different depending on the existence of an effective cooling structure.

  Regarding the reflection type, the transmission type FEL shown in FIG. 4 is compared with the reflection type FEL shown in FIG. As shown in FIG. 4, the transmission type FEL 100-1 has a structure in which the route from the electron beam 8 to the light emission 14 passes through the phosphor layer 6. On the other hand, in the reflection type FEL 20-2 of FIG. 5, the route from the electron beam 8 to the light emission 14 is reflected by the phosphor layer 6, and the light emission 14 goes to the outside through the translucent member 17.

  Next, regarding the structure of the phosphor substrate, in the transmissive FEL 100-1 shown in FIG. 4, the phosphor layer 6 is formed on the surface of glass (not shown; see reference numeral 160 in FIG. 2). An aluminum thin film (metal back layer) 7 is formed on the surface of 6. On the other hand, in the reflective FEL 20-2 shown in FIG. 5, the phosphor layer 6 is formed on the surface of the Ni substrate 18. Since the phosphor layer 6 is formed on the conductive Ni substrate 18, a separate aluminum thin film for avoiding charge-up and maintaining the potential of the phosphor layer is not required. Therefore, the electrons 8 ejected from the electron emission source 2 can directly collide with the phosphor layer 6 without receiving an energy loss due to passing through the aluminum thin film.

  Further, in the transmission type FEL 100-1, there is a light transmission loss until the emitted light beam 14 generated when the electron beam 8 collides with the phosphor layer 6 passes through the phosphor layer 6 and reaches the light emission surface side. However, the reflection type FEL 20-2 has no such light transmission loss.

  Further, when the electrons 8 collide with the phosphor layer 6, the phosphor layer 6 generates heat, but in the transmission type FEL 100-1 shown in FIG. 4, the back surface of the phosphor layer 6 is glass (not shown). The thermal conductivity is poor. On the other hand, in the reflection type FEL 20-2 of FIG. 5, since the back surface of the phosphor layer 6 is the Ni substrate 18, and the Ni substrate has good thermal conductivity, a good cooling effect can be obtained. Further, if necessary, an appropriate cooling means (cooling fin, cooler, etc.) can be provided on the back surface of the Ni substrate 18 without shielding the electron beam 8 or the emitted light beam 14. On the other hand, in the transmissive FEL 100-1 shown in FIG. 4, it is difficult to provide a cooling means on the back surface of the glass without shielding the emitted light 14 (see FIG. 2).

  As described above, since the reflective FEL 20-2 has several advantages compared to the transmissive FEL 100-1, the reflective FEL is employed in the first embodiment shown in FIG.

  On the other hand, there is also a defect that the reflective FEL 20-2 has compared to the transmissive FEL 100-1. As shown in FIG. 6, in the reflective FEL 20-2, a part of the light emission 14 from the phosphor layer 6 is shielded by the electron emission source 2 and the gate 4, and the range of the angle θ in the upper light emission range is Has the disadvantage of being a shadow. In order to avoid this drawback, as shown in FIG. 3, in the reflective FEL 20-1 according to the first embodiment, the electron emission source 2-1 and the gate electrode 4-1 are formed in an annular shape, respectively. By removing the angle θ range and providing a large gap, the electron emission source 2-1 and the gate electrode 4-1 do not shield the light emission 14 from the phosphor layer 6-1 and pass through the annular inner space portion. Like to do. This eliminates the disadvantage of blocking light emission and creating shadows.

  By making the electron emission source 2 into an annular shape or the like, the disadvantage that the electron emission source 2 shields part of the light emission 14 can be solved. However, as shown in FIG. 3B, the configuration in which the electron beam 8 is obliquely incident on the phosphor layer 6-1 also has a drawback. FIG. 7 is a diagram for explaining a drawback of oblique irradiation of an electron beam. 7 to 9, it should be understood that only the electron emission source and the phosphor layer are illustrated and the gate electrode is omitted in order to simplify and understand the drawings. As shown in FIG. 7, they are arranged at a certain distance (note that this certain distance is the distance between the cathode that is the electron emission source and the anode on which the phosphor layer is formed). When an electric field is formed by applying a voltage between the electron emission source 2-1 having the following size and the phosphor layer 6-1 having a certain size, ideally, the entire surface of the electron emission source It is desirable that a uniform electric field is formed from the surface to the entire surface of the phosphor layer, and a uniform electron beam as shown by a broken line 8i is directed between both surfaces. However, in reality, the electric field at the point P closest to the electron emission source 2-1 in the phosphor layer 6-1 is concentrated, and the electron beam 8 from the electron emission source 2-1 becomes the phosphor layer. Therefore, only the light emitter at point P emits light.

  In order to avoid the disadvantage that the electron beam 8 is concentrated on one point of the phosphor layer, as shown in FIG. 8, the phosphor layer 6-2 has a structure having a minute size phosphor layer (dot phosphor layer). preferable. The dimension of the phosphor layer 6-2 is typically a circle of 3 mmφ. In the reflective FEL 20-1 according to the first embodiment shown in FIG. 3, the light emitter 6-1 is a point light emitter.

  However, as shown in FIG. 8, the reflective FEL 20-3 also has a defect that the electron beam 8 from the electron emission source 2-2 having a certain size is excessively concentrated on the phosphor layer 6-2 having a small size. . In order to avoid this drawback, the reflection type FEL 20-4 shown in FIG. 9 may be configured to have a minute size electron emission source 2-3 and a minute size light emitter 6-3. The dimensions of the electron emission source 2-3 and the light emitter 6-3 are each typically a circle of 3 mmφ. In the reflective FEL 20-1 according to the first embodiment, the electron emission source 2-1 having an annular shape or the like is formed by a large number of small pieces, and the light emitter 6-1 is also arranged in an annular shape or the like correspondingly. Alternatively, it may be formed of a large number of small pieces.

[Second Embodiment]
FIG. 10A is a schematic diagram showing the structure of a reflective FEL 20-4 according to the second embodiment, and FIGS. 10B and 10C are electron emission sources 2 of the reflective FEL 20-4. 4 is a diagram for explaining the relationship between the phosphor layer 6 and the phosphor layer 6-4. Here, FIG. 10 (B) is the same side view as FIG. 10 (A), and FIG. 10 (C) is a plan view.

  As shown in FIGS. 10B and 10C, in the reflective FEL 20-4 according to the second embodiment, a plurality of line-shaped electron emission sources 2-4 and a plurality of line-shaped light emitters 6-4. The combination structure is adopted.

  Compared with the reflective FEL 20-1 shown in FIG. 3, the reflective FEL 20-4 according to the second embodiment is (1) In the reflective FEL 20-1 (FIG. 3), the electron emission source and the gate shield light emission. In contrast, the reflective FEL 20-4 (FIG. 10) is positioned in a region where light emission is blocked, but a gap that effectively transmits light is provided. (2) In the reflective FEL 20-1, the electron emission source 2-1 and the phosphor layer 6-1 are both formed in an annular shape, whereas in the reflective FEL 20-4 (FIG. 10), The electron emission source 2-4 and the phosphor layer 6-4 are different in that both are formed in a plurality of line shapes. Other components are the same as those of the reflective FEL 20-1 shown in FIG.

  Since the line-shaped phosphor layer 6-4 can secure a wide light emitting surface, the current density to the phosphor layer can be kept relatively low, and it is expected that the light emission efficiency is increased.

As shown in FIG. 10B, a plurality of line-shaped electron emission sources 2-4 are arranged with a space between each other, and similarly, a plurality of line-shaped light emitters 6-4 with a space between each other. Has been placed.
As shown in the plan view of FIG. 10C, the line-shaped electron emission sources 2-4 and the line-shaped light emitters 6-4 are alternately arranged so as to match each interval.

  Light emission from the phosphor layer 6-4 is directed to the outside through a gap (space portion) between adjacent line-shaped electron emission sources 2-4.

  The modifications, alternatives, and the like described in the first embodiment are also applied to the reflective FEL 20-4 according to the second embodiment. For example, the electron emission source 2-1 is formed on a light transmissive member that is separate from the light transmissive member 6, and the electron emission source 2-1 and the phosphor layer 6-1 are each formed in a line shape. For example, it is arranged and formed.

[Third embodiment]
The reflective FEL 20-5 according to the third embodiment shown in FIG. 11 has a wider interval (space portion) between adjacent linear electron emission sources 2-6 than the reflective FEL 20-4 shown in FIG. Is different in that the interval between the line-shaped light emitters 6-6 adjacent to each other is wide. The other components are the same as those of the reflective FEL 20-4 shown in FIG.

  The modifications, alternatives, and the like described in the first embodiment are also applied to the reflective FEL 20-5 according to the third embodiment. For example, the electron emission source 2-1 is formed on a light transmissive member that is separate from the light transmissive member 6, and the electron emission source 2-1 and the phosphor layer 6-1 are each formed in a line shape. For example, it is arranged and formed.

[Advantages and effects of this embodiment]
The main advantages and effects of this embodiment are as follows.

  (1) By adopting the reflection type FEL, there is no energy loss due to the metal back layer of the electron beam and no light transmission loss due to the passage of the emitted light through the phosphor layer.

  (2) By adopting the reflective FEL, the phosphor layer can be formed on the surface of the conductive member, and a good cooling effect of the phosphor layer can be obtained. Furthermore, it is possible to provide additional cooling means.

  (3) In the first embodiment, the use of an annular electron emission source or the like can eliminate the occurrence of shadows in the emitted light beam.

  (4) In the second embodiment, the current density of the phosphor layer can be kept relatively low, and the luminous efficiency can be increased.

  (5) In the third embodiment, since the interval between the adjacent line-shaped electron emission sources is widened, the generation of shadows of the emitted light can be reduced.

  While the embodiments of the reflective field emission lamp according to the present invention have been described above, these are merely examples and do not limit the scope of the present invention. Additions, deletions, changes, improvements, and the like that can be easily made by those skilled in the art within the present embodiment are within the scope of the present invention. The technical scope of the present invention is determined based on the description of the appended claims.

2, 2-1, 2-2, 2-3, 2-4, 20: electron source, electron beam source, electron emission source, 4,4-1, 4-2, 4-3, 4-4, 40 : Gate electrode, 6,6-1, 6-2, 6-3, 60: phosphor layer, phosphor film, 70: aluminum thin film, metal back layer, 8, 80: electron beam, 10: FEL, 12: Container, 12a: vacuum space, 16: translucent member, 18, 18-1: conductive member, metal substrate, nickel substrate, 20, 20-1, 20-2, 20-3, 20-4, 20- 5: reflection type FEL, 100: transmission type FEL, 160: glass,
FEL: Field emission lamp

When a positive voltage Vk is applied between the cathode electron source 20 and the grid electrode 40 and a strong electric field is generated on the surface of the multilayer CNT cathode 20, electrons 80 are ejected. The electrons 80 emitted from the electron source 20 are accelerated in a vacuum space, penetrate the aluminum thin film 70 to which the positive voltage Va is applied, collide with the phosphor 60, and the phosphor 60 emits light by electron beam excitation.

Claims (9)

In a reflective field emission lamp comprising an electron emission source, a gate electrode and a phosphor layer formed in a vacuum space,
The electron emission source is formed on the surface of the translucent member,
The gate electrode is formed to cover the electron emission source with a gap therebetween,
The phosphor layer is formed on the surface of a conductive member arranged to face the gate electrode,
The electron emission source emits an electron beam by forming an electric field with the gate electrode,
The phosphor layer emits excitation light when an electric field is formed between the phosphor layer and the electron beam collides,
The field emission lamp, wherein the electron emission source is disposed so as to form a space through which the emitted light beam passes on the surface of the translucent member, and the emitted light beam passes through the space and is extracted to the outside. The field emission lamp according to claim 1,
The translucent member is a field emission lamp which is a part of a container surrounding the vacuum space. The field emission lamp according to claim 1,
The translucent member is a field emission lamp disposed in the vacuum space separately from a container surrounding the vacuum space. In the field emission lamp according to any one of claims 1 to 3,
The electron emission source is formed in an annular shape, a frame shape (frame shape) or an elliptical ring shape on the surface of the translucent member, and a space for passing the emitted light beam is formed inside the field. Emission lamp. In the field emission lamp according to any one of claims 1 to 3,
The field emission lamp, wherein the electron emission source is formed on the surface of the translucent member in a line shape spaced apart from each other, and the space is a space for passing the emitted light beam. In the field emission lamp according to any one of claims 1 to 5,
The electron emission source is a field emission lamp formed by applying an electronic material to the surface of a wire. In the field emission lamp according to any one of claims 1 to 5,
The electron emission source is a field emission lamp formed of carbon nanotubes. In the field emission lamp according to any one of claims 1 to 7,
The field emission lamp, wherein the conductive member is made of a metal substrate, and the phosphor layer is formed on a surface of the metal substrate. In the field emission lamp according to any one of claims 1 to 8,
In the field emission lamp, the electron emission source is formed to have a certain size, whereas the phosphor layer is formed to have a dot size.

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