Classifications

• • 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
• • 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
• • 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
  • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Definitions

• Discharge lamp electrode for discharge lamp, method for manufacturing electrode for discharge lamp, and lighting device
• the present invention relates to a hot cathode type discharge lamp, an electrode for a discharge lamp, a method of manufacturing an electrode for a discharge lamp, and a lighting device. Specifically, by using an electrode having a coil portion along the tube axis of the glass tube, the life of the thin glass tube and the electrode can be extended.
• a discharge lamp using a phosphor has been used as a light source.
• a hot cathode type discharge lamp is used not only for lighting but also for backlighting of liquid crystal displays because of its high luminous efficiency and high luminance.
• a hot cathode type discharge lamp has electrodes at both ends of a glass tube, a rare gas such as argon and mercury sealed in a space in the glass tube, and a phosphor is applied to the inner surface of the glass tube. It is a configuration.
• FIG. 1 is a cross-sectional view showing a configuration example of a conventional hot cathode type discharge lamp.
• the discharge lamp 51 is provided with electrodes 53 at both ends of the glass tube 52.
• a rare gas such as argon and mercury are sealed in a space inside the glass tube 52, and a phosphor 52a is applied to a predetermined area on the inner surface of the glass tube 52.
• the electrode 53 is provided with a heater 54 having a coil portion 54a.
• the heater 54 is coated with an electron emitting material 53a such as barium oxide.
• the heater 54 is stretched between two lead-in wires 55 inserted and held at the end of the glass tube 52. For this reason, in the electrode 53, the coil portion 54a of the heater 54 is disposed in the lateral direction orthogonal to the tube axis of the glass tube 52.
• the light emitting principle of the hot cathode type discharge lamp 51 will be described.
• each electrode 53 is energized and the electron emitting material 53 a is heated by the heater 54 and a voltage is applied between the both electrodes 53 at a high frequency, the electron emission is Electrons are emitted from the emission material 53 a and arc discharge occurs between the electrodes 53.
• the excited mercury atoms emit ultraviolet light. This ultraviolet light is emitted by the phosphor 52a Then, it is converted into visible light, and the discharge lamp 51 emits light.
• ion sputtering in which ions generated during discharge collide with the electrode and scatter the electron emission material, is generated. That is, since the coil of the heater constituting the electrode is disposed transversely perpendicular to the tube axis of the glass tube, ion collision occurs in many parts of the coil. As a result, ion sputtering significantly occurs. When ion sputtering occurs significantly throughout the coil, the electron-emitting material dies during discharge, and stable arc discharge can not be maintained for a long period of time. Therefore, there is a problem that the life of the electrode is shortened.
• the heater extends in the direction orthogonal to the tube axis, there is a problem that the tube diameter can not be reduced.
• the present invention has been made to solve such problems, and can achieve high efficiency and long life, and can produce discharge lamps with narrow tube diameters, electrodes for discharge lamps, and electrodes for discharge lamps. It aims to provide a method and a lighting device.
• the discharge lamp according to the present invention has a heater in which a first lead portion connected to the coil portion and a second lead portion connected to the coil portion on the rear end side of the coil portion extend.
• the heater includes an electrode coated with an electron-emitting material, and the electrode includes a first introduction tube provided at each end of a glass tube sealed with a gas containing a luminescent material and coated with a phosphor on the inner surface.
• the first lead portion is connected to the wire, the second lead portion is connected to the second lead-in wire, and the coil portion is disposed in the longitudinal direction along the tube axis of the glass tube.
• the discharge lamp of the present invention when the electrodes are energized, the electron-emitting material is heated to emit electrons, and by applying a voltage at high frequency to both electrodes, arc discharge occurs. Ru. The accelerated electrons collide with the luminescent material to excite the luminescent material, for example, to emit ultraviolet light. Then, the ultraviolet light collides with the phosphor to be converted into visible light, and the discharge lamp emits light.
• Ions generated during discharge collide with the electrode and cause scattering of the electron-emitting substance. Since the coil portion of the electrode is disposed longitudinally along the tube axis of the glass tube, the ions are mainly It collides with the tip of the coll section. For this reason, scattering of the electron emission material can be suppressed in most of the coil portion.
• the first lead portion and the second lead portion connected to the coil portion extend from the rear end side of the coil portion, the heater to which the electron emitting material is applied, and the coil It has an anti-scattering member which opens at a surface facing the front end and the rear end of the part and covers the periphery of the coil part.
• the coil portion of the heater when attached to the end of the glass tube, is disposed in the longitudinal direction along the tube axis of the glass tube. Ions generated during discharge are
• the scattering prevention member disposed around the coil portion suppresses the collision of ions to the side surface of the coil portion and suppresses the evaporation of the electron emission material.
• a method of manufacturing a discharge lamp electrode according to the present invention includes a wire rod and a winding step of forming a heater having a shape in which the first lead portion and the second lead portion extend from the rear end side of the coil portion. And welding the first lead portion of the heater to the first connection member of the connection reinforcing member in which the first connection member and the second connection member are integrated at the connection portion, and the second connection member is welded to the second connection member.
• Welding step of welding the lead portion of the wire coating step of holding the heater by the connection reinforcing member and applying the electron emission substance to the heater, and welding the first lead wire to the first connecting member
• a second welding process for welding the second lead-in wire to the second connection member a cutting process for cutting the connecting portion from the connection reinforcing member, and separating the first connecting member and the second connecting member
• the first lead portion of the heater formed by winding the wire is connected to the first connection member of the connection reinforcing member, and the second The lead portion of is connected to the second connection member. Since the first connecting member and the second connecting member are integrated at the connecting portion during the manufacturing process, they have the function of maintaining the shape of the heater. And the heater The deformation process of the heater in the manufacturing process is prevented by performing the application process of the electron emission material and the welding process of the lead-in wire while maintaining the shape of.
• a lighting device includes the above-described discharge lamp.
• FIG. 1 is a cross-sectional view showing a configuration example of a conventional hot cathode type discharge lamp.
• FIG. 2A is a cross-sectional view of main parts showing a configuration example of a discharge lamp according to the present embodiment.
• FIG. 2B is an entire cross sectional view showing a configuration example of a discharge lamp according to the present embodiment.
• FIG. 3A is a perspective view showing a configuration example of a discharge lamp electrode of the present embodiment.
• FIG. 3B is a perspective view showing a configuration example of a discharge lamp electrode of the present embodiment.
• FIG. 4A is an explanatory view showing an example of the configuration of a heater.
• FIG. 4B is an explanatory view showing an example of the configuration of a heater.
• FIG. 4C is an explanatory view showing an example of the configuration of a heater.
• FIG. 5 is a graph comparing the life of the discharge lamp of the present embodiment and a conventional discharge lamp.
• FIG. 6A is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6B is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6C is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6D is a process diagram showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6E is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6F is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6G is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 6H is a process chart showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 61 is a process diagram showing an example of a method of manufacturing a discharge lamp electrode of the present embodiment.
• FIG. 7 is a perspective view showing a configuration example of a heater tab.
• FIG. 8 is a schematic cross-sectional view showing a configuration example of a lighting device of the present embodiment.
• FIGS. 3A and 3B are perspective views showing a configuration example of a discharge lamp electrode of the present embodiment.
• FIG. 2A is a cross-sectional view of the main part of the end of the discharge lamp taken along a plane along the tube axis
• FIG. 2B is a cross-sectional view of the entire discharge lamp.
• FIG. 3A is a perspective view in which the electrode is viewed from the tip end side
• FIG. 3B is a perspective view in which the electrode is viewed from the rear end side.
• the discharge lamp 1 of the present embodiment is a hot cathode type discharge lamp, and is provided with electrodes 3 at both ends of a rod-like, small-diameter glass tube 2.
• the phosphor 2 a is applied to the inner surface of the glass tube 2 in a predetermined range.
• a rare gas such as argon (Ar) or neon (Ne) and mercury (Hg) which is a light-emitting substance are sealed in the inside of the glass tube 2.
• the electrode 3 is provided with a coil portion 4a, a first lead portion 4b connected from the coil portion 4a, and a heater 4 which is also a force with a second lead portion 4c.
• the heater 4 is formed of a wire rod made of tungsten (W) or rhenium tungsten (Re-W). It should be noted that rhenium tungsten is used in this example because the wire of laser tungsten is superior to the wire of tungsten at the time of heating.
• FIG. 4A to FIG. 4C are explanatory diagrams showing an example of the configuration of the heater 4.
• a method of manufacturing the heater 4 will be described later, but as shown in FIG. 4A, for example, a wire rod made of rhenium tungsten or the like in a spiral form is wound in a spiral form so that the wires do not contact each other.
• a substantially cylindrical coil portion 4a having a double spiral structure is formed, and two lead portions 4b and 4c extend from the rear end of the coil portion 4a.
• the wire wound in a spiral shape is further wound in a spiral, and as shown in the overall view of FIG. 4B, the spirally wound wire is further spiraled. It is also possible to form a substantially cylindrical coil portion 4a having a triple helical structure, and to extend the two lead portions 4b and 4c from the rear end of the coil portion 4a.
• the spirally wound wire is further spirally wound, and the double spiral structure is referred to as a double helical structure, and the wire wound in a spiral is further spirally wound, and this wire is Furthermore, a spiral helical structure is called a triple helical structure as a triple helical structure.
• the heater 4 has the coil portion 4a disposed in the longitudinal direction along the tube axis, and as shown in FIG. 4C, even a single helical structure in which the wire is simply wound in a spiral shape as shown in FIG. 4C. Good Yes.
• the heater 4 is coated with a ternary alkaline earth metal oxide that also has barium (Ba), strontium (Sr), and calcium (Ca) force as the electron emitting material 3a.
• the electron emitting substance 3a may be binary norium oxide.
• zirconium oxide may be added to the above-described alkaline earth metal oxide as generally known as an electron emitting material for a hot cathode discharge lamp. .
• the heater 4 When the heater 4 has a triple helical structure, the diameter of the coil portion 4a increases. Therefore, in order to reduce the diameter of the glass tube 2, the heater 4 preferably has a double helical structure. .
• a wire material for forming the heater 4 a wire having a diameter of about 25 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ m is used as a thickness that can achieve both ease of winding in the case of a double spiral structure and strength. For example, a diameter of about 45 ⁇ m to 55 ⁇ m is desirable.
• the electrode 3 comprises a first heater tab 5 a and a second heater tab 5 b for supporting the heater 4.
• the first heater tab 5a is a first connecting member, and the rear end side of the first lead portion 4b of the heater 4 is connected by welding.
• the second heater tab 5b is a second connecting member, and the rear end side of the second lead portion 4c is connected by welding.
• the first heater tab 5 a and the second heater tab 5 b are plate members such as stainless steel (SUS 304), which will be described in the method of manufacturing the electrode 3 described later.
• SUS 304 stainless steel
• the two heater tabs 5b are integral and function as connection reinforcing members and are separated during the manufacturing process.
• the electrode 3 is connected to the first lead-in wire 6a and the second lead-in wire 6b via the first heater tab 5a and the second heater tab 5b.
• the first lead-in wire 6a and the second lead-in wire 6b are provided at both ends of the glass tube 2, are substantially parallel to each other, and penetrate the end of the glass tube 2 from the outside to the inside.
• the first heater tab 5a is connected by welding to the tip side of the portion of the first lead-in wire 6a extending to the inside of the glass tube 2, and the inside of the glass tube 2 of the second lead-in wire 6b is connected. Extend to The second heater tab 5b is connected by welding to the front end side of the portion.
• the electrodes 3 supported by the first lead-in wire 6 a and the second lead-in wire 6 b are arranged vertically with the coil portion 4 a of the heater 4 along the tube axis of the glass tube 2. For this reason, ions generated by the discharge mainly collide with the tip of the coil portion 4a, and the side surfaces of the coil portion 4a are less likely to cause the scattering of the electron emitting material 3a due to the ion collision.
• the electrode 3 supports the heater 4 on the lead-in wire by the two lead portions extending from the rear end side of the coil portion 4a, the heater 4 is configured to have no tension and thus disconnection occurs. It is difficult to do.
• the electrode 3 is provided with the sleeve 7 to prevent the scattering and evaporation of the electron emitting material 3 a.
• the sleeve 7 is an example of a scattering prevention member, and is made of nickel (Ni), molybdenum (Mo 2) or the like, and has a cylindrical shape with both ends open.
• the sleeve 7 is inserted to the inside in a direction in which the coil portions 4 a of the heater 4 are substantially parallel, and is attached to the first heater tab 5 a by the sleeve lead 8.
• the sleeve 7 covers the periphery of the coil portion 4a in a form in which the front end side and the rear end side of the coil portion 4a are opened.
• the sleeve lead 8 is made of, for example, stainless steel (SUS 304) in the same manner as the first heater tab 5a and the second heater tab 5b. Further, in this example, the three bleeds 8 may be fixed to the first heater tab 5a, and may be fixed to the second heater tab 5b.
• the inner diameter of the sleeve 7 is larger than the outer diameter of the coil portion 4 a of the heater 4 and the coil portion 4 a of the heater 4 is inserted in a substantially parallel direction, It is constructed so that the part 4 a does not touch.
• the outer diameter of the sleeve 7 is smaller than the inner diameter of the glass tube 2 so that the sleeve 7 and the glass tube 2 do not come in contact with each other.
• the mounting position of the sleeve 7 is set such that the tip end portion of the coil portion 4 a does not protrude from the open end face 7 a of the sleeve 7.
• the positional relationship between the sleeve 7 and the heater 4 is preferably such that the front end of the coil portion 4a is inserted inward from the open end surface 7a of the sleeve 7, but the open end surface 7a of the sleeve 7 and the coil portion 4a
• the tips may be located in the same plane.
• the length of the sleeve 7 is made longer than the length of the coil portion 4a, and the entire side surface of the coil portion 4a is scratched.
• the shape is covered with
• the application range of the phosphor 2 a on the inner surface of the glass tube 2 described above is set to a position slightly outside the opening end face 7 a of the sleeve 7 of the electrode 3.
• the range where the phosphor 2 a is applied is the light emitting portion of the discharge lamp 1.
• a voltage between the lead portions 4b and 4c of the heater 4 constituting each electrode 3 for example, a voltage of about 5 V is applied between the first lead-in wire 6a and the second lead-in wire 6b. Heat the electron-emitting substance 3a in 4. Then, a voltage of about 300 V, for example, is applied between the two electrodes 3 at high frequency.
• the excited mercury atoms emit ultraviolet light. This ultraviolet light is converted to visible light by the phosphor 2a, and the discharge lamp 1 emits light.
• the force coil portion 4a is disposed in the longitudinal direction along the tube axis of the glass tube 2, so the ions It mainly collides with the tip of coil part 4a. For this reason, the scattering of the electron emission substance 3a is suppressed in most of the side surface of the coil portion 4a.
• the electron emitting material 3 a is evaporated by the heating of the heater 4. If the sleeve 7 is not provided, the evaporated electron emitting material 3 a is deposited on the inner surface of the glass tube 2. On the other hand, the coil section When the 4 a is inserted into the sleeve 7, the electron emitting material 3 a evaporated from the heater 4 is deposited on the inner surface of the sleeve 7. Then, the sleeve 4 is also heated by the heater 4 being heated, and electrons are also emitted from the electron emission material 3 a attached to the sleeve 7. Thus, the life of the electrode 3 can be extended.
• the life of the electrode 3 can be extended, the life of the discharge lamp can be extended.
• the heater 4 can be inserted into the sleeve 7 to be heated to a desired temperature at a low voltage by thermal radiation.
• the voltage applied during preheating can be reduced, for example, from about 5 V to about 3 V, for example.
• the tube diameter of the glass tube 2 is equal to the diameter of the coil portion 4 a.
• the diameter can be reduced.
• the outer diameter of the glass tube was limited at around 6.2 mm.
• the outer diameter of the glass tube 2 can be reduced to about 2 to 3 mm.
• a cold cathode type discharge lamp with a thin tube diameter has been used to reduce the thickness of the display.
• the discharge lamp 1 of the present embodiment by arranging the coil portion 4a in a vertical manner, the diameter of the glass tube 2 can be reduced.
• the display can be thinned.
• the hot cathode discharge lamp has better luminous efficiency as compared to the cold cathode discharge lamp, and the hot cathode discharge lamp has a higher efficiency than the cold cathode discharge lamp. It is known that the efficiency is doubled and the brightness is also doubled. Also, in general, in the discharge lamp, the diameter of the glass tube is It is known that the brightness is improved by thinning.
• the discharge lamp 1 of this example when used as a direct backlight of a liquid crystal display, if the same level of luminance as that of the cold cathode discharge lamp is used, the discharge lamp 1 used is The number of electric lights 1 can be reduced to about half.
• the power consumption when using 10 discharge lamps 1 as direct backlights of a 20-inch liquid crystal display is about 33 watts. Since the power consumption of the backlight using the same number of cold cathode discharge lamps of the same size is about 55 watts, the use of the discharge lamp 1 of this example reduces the power consumption by about 40 percent. As a result, the brightness can be improved and the power consumption can be reduced as compared to a cold cathode discharge lamp.
• the coil portion 4a can ensure a length capable of applying a sufficient amount of the electron-emitting substance 3a, the life can be extended even if the glass tube 2 is narrowed.
• FIG. 5 is a graph comparing the lifetimes of the discharge lamp 1 of the present embodiment and the conventional discharge lamp, and in the discharge lamp 1 of the present embodiment described in FIG. 2A, FIG. 2B and FIG. 3A, FIG.
• the change in luminance when the voltage applied to each electrode 3 is 2 V is indicated by a broken line L1.
• a voltage application to each electrode 3 is not present, and a change in luminance in the case where the voltage is applied is indicated by a dashed dotted line L2.
• the change in luminance of the discharge lamp of the conventional structure shown in FIG. 1 is indicated by a solid line L3.
• the luminance decreases to 50% of the luminance at the start of use in about 7000 hours in which the reduction of the electron emitting material is accelerated by ion sputtering. Then, before reaching 10000 hours, the electrode of the electron emitting material is broken.
• the discharge lamp 1 of the present embodiment described in FIG. 2A, FIG. 2B and FIG. 3A, FIG. 3B sufficient ion sputtering does not occur regardless of the diameter of the glass tube 2
• the amount of the electron-emitting substance 3a can be applied to the heater 4. Therefore, when no voltage is applied to each electrode 3, the relative luminance is 50% or more for about 35,000 hours, and a voltage of about 2 V is applied to each electrode 3. Even if the time exceeds 60000 hours, the relative brightness is 50% or more, and no decay of the electron emitting material 3a occurs.
• the discharge lamp 1 of the present embodiment It has been found that it has a life of about 5-10 times compared to the conventional discharge lamp.
• the two leads in order to arrange the coil portion 4 a of the heater 4 in the longitudinal direction along the tube axis of the glass tube 2, the two leads also extending the rear end side force of the coil portion 4 a
• the heater 4 is supported by the lead-in wire at the part.
• the heater 4 has a configuration in which no tension is applied, and the heater 3 is manufactured when the electrode 3 is manufactured.
• the challenge is to maintain the shape of 4. Therefore, the shape of the heater 4 is maintained by connecting the lead portion and the lead-in wire through the heater tab and making the heater tab function as a connection reinforcing member.
• FIGS. 6A to 61 are process drawings showing an example of a method of manufacturing an electrode for a discharge lamp of the present embodiment, and a method of manufacturing an electrode 3 using a heater tab will be described below.
• a wire rod 9 of rhenium tanden is spirally wound around the core wire 10 of molybdenum as a first winding step.
• the core wire 10 wound with the wire 9 is wound in a double spiral to form a substantially cylindrical coil portion 4a, and the coil portion 4a
• Two lead parts 4b and 4c extend from the rear end.
• adjacent wire rods 9 do not come in contact with each other to have a shape.
• the heater 4 whose shape is held by the core wire 10 is created.
• the winding process includes a process of removing the distortion of the wire 9 by heat treatment.
• FIG. 7 is a perspective view showing an example of the configuration of the heater tab.
• the heater tab 5 is a connection reinforcing member, and includes the first heater tab 5a and the second heater tab 5b as described above.
• the first heater tab 5a and the second heater tab 5b have L-shaped cross-sectional shapes, respectively, and the short side of the L-shape is connected by the connecting portion 5c, and the first heater tab 5a and the second heater tab 5b are It is a body.
• a separation groove 5d is formed between the first heater tab 5a and the second heater tab 5b. Minutes The separation groove 5d extends to the connecting portion 5c, and facilitates separation of the first heater tab 5a and the second heater tab 5b by cutting the connecting portion 5c described later.
• the first heater tab 5a of the integrated heater tab 5 and the rear end of the first lead portion 4b of the heater 4 are integrated. Weld the side. Further, the rear end side of the second lead portion 4c of the heater 4 is welded to the second heater tab 5b. As a result, the heater assembly 11 in which the heater 4 and the heater tab 5 are combined is created. In the heater tab welding process, since the heater 4 is held in shape by the core wire 10, no mold breakage occurs.
• the core wire 10 of molybdenum carbide wound with the rhenium tungsten wire 9 is melted.
• the heater assembly 11 is immersed in a mixed acid solution of sulfuric acid and nitric acid to dissolve the core 10 of molybdenum.
• the heater 4 and the heater tab 5 remain as they are.
• the strength of the heater 4 is weakened against external force by melting the core wire 10 of molybdenum.
• the heater 4 has the first lead portion 4 b and the second lead portion 4 c of the heater tab 5 of the core structure. By being supported, the entire strength of the heater assembly 11 is maintained, and no mold breakage occurs during operation.
• the electron emitting material 3a is applied to the heater 4.
• (Ba, Sr, Ca) CO which is a ternary barium oxide, is applied to the heater 4.
• the application of quality 3a is carried out, for example, by spraying.
• the spraying method for example, by spraying the electron emitting material 3a on the heater 4 while rotating the heater assembly 11, the electron emitting material 3a can be applied at a uniform density to the inside of the coil portion 4a.
• the electron emitting material 3a may be applied by dipping. That is, by immersing the heater 4 of the heater assembly 11 in a tank containing the electron emitting substance 3a, the electron emitting substance 3a can be applied to the coil portion 4a.
• the film thickness of the electron emitting material 3a applied to the coil portion 4a is 30 to 60. About / zm is desirable.
• the sleeve lead 8 is welded to the sleeve 7 as shown in FIG. 6F.
• a sleeve assembly 12 in which the sleeve 7 and the sleeve lead 8 are integrated is produced.
• the sleeve assembly 12 may be heat treated to remove dirt and distortion.
• the heater assembly 11 and the sleeve assembly 12 are connected after the application of the electron emitting material 3a is completed.
• the coil portion 4 a of the heater 4 is inserted into the sleeve 7.
• the sleeve lead 8 aligned with the first heater tab 5a alignment is performed so that the side surface of the coil portion 4a does not contact the inner surface of the sleeve 7.
• the sleeve lead 8 is connected to the first heater tab 5a by welding. As a result, the heater assembly 11 and the sleeve assembly 12 are integrated.
• the heater assembly 11 finished with the attachment of the sleeve assembly 12 is connected to the first lead wire 6a and the second lead wire 6b.
• first lead-in wire 6 a and the second lead-in wire 6 b are integrated by the stem glass 13.
• the first lead-in wire 6a and the second lead-in wire 6b are supported by the stem glass 13 substantially in parallel with a predetermined gap so as not to contact each other.
• first lead-in wire 6a and the first heater tab 5a are connected by welding, and the second lead-in wire 6b and the second heater tab 5b are connected by welding.
• the distance between the first lead 4b and the second lead 4c of the heater 4 and the distance between the first lead-in wire 6a and the second lead-in wire 6b supported by the stem glass 13 are If they are different, bending will be required if you try to connect the lead and lead directly.
• the connecting portion 5c of the heater tab 5 shown in FIG. 7 is cut by a laser or the like.
• the force heater tab 5 in which the cutting position C of the connecting portion 5c is indicated by a two-dot chain line is formed with the separation groove 5d between the first heater tab 5a and the second heater tab 5b.
• a gap is formed between the heater tab 5a of 1 and the second heater tab 5b, and both are electrically independent.
• the electrode 3 is completed as shown in FIG.
• the heater 4 is supported by the heater tab 5 having the first heater tab 5a and the second heater tab 5b. For this reason, the shape of the heater 4 does not occur.
• the heater 4 is moved by the first lead-in wire 6a and the second lead-in wire 6b supported by the stem glass 13. It becomes a supported form and again there is no loss of shape.
• the electrode 3 As described above, by manufacturing the electrode 3 so that the shape of the heater 4 can be maintained by the heater tab 5, deformation of the heater 4 in the manufacturing process can be prevented. As a result, since the yield is improved, the electrode 3 having the heater 4 in which the coil portion 4a is disposed in the longitudinal direction along the tube axis of the glass tube 2 can be manufactured at low cost.
• the strength can be increased by forming the first heater tab 5a and the second heater tab 5b into an L-shaped shape even after the connecting portion 5c is cut.
• the first heater tab 5a and the second heater tab 5b function as a reinforcing member in the case of being used as a product in addition to the function as a reinforcing member in the manufacturing process.
• FIG. 8 is a schematic cross-sectional view showing a configuration example of the lighting device of the present embodiment.
• the illumination device 14 of the present embodiment includes the discharge lamp 1 described in FIGS. 2A, 2B and 3A, 3B, the diffusion plate 15, the brightness enhancement sheet 16, the reflection sheet 17, the case 18 and the like. Prepare.
• a reflection sheet 17 that reflects light is disposed on the entire bottom surface of the case 18, for example, and a plurality of discharge lamps 1 are arranged in parallel, for example, on the upper side of the reflection sheet 17.
• a diffusion plate 15 is disposed on the upper side of the discharge lamp 1 to diffuse the light emitted from the discharge lamp 1 to make the light intensity uniform, and on the upper side of the diffusion plate 15 A brightness up sheet 16 is disposed to increase the brightness of the emitted light.
• the discharge lamp 1 of the present embodiment has the coil portion 4 a of the heater 4 constituting the electrode 3 in the longitudinal direction along the tube axis of the glass tube 2. Since the coil portion 4a can secure a length capable of applying a sufficient amount of the electron-emitting substance 3a by arranging it, the life can be extended even if the glass tube 2 is thin-diametered.
• the coil portion of the heater on which the electron emitting material is applied is provided with the electrodes arranged in the longitudinal direction along the tube axis of the glass tube.
• the electrode according to the present invention ions generated during discharge mainly collide with the tip of the coil portion, and ion sputtering can be suppressed in most of the side surface of the coil portion.
• the decay of the electron-emitting material can be suppressed, and electrons can be emitted for a long time.
• the life of the electrode can be extended. And, by extending the life of the electrode, the life of the discharge lamp can be extended.
• the electrode diameter of the glass tube can be reduced without shortening the length of the coil portion.
• the brightness can be improved by reducing the diameter of the glass tube.
• the force coil portion can secure a length capable of applying a sufficient amount of the electron-emitting substance, so that the life can be extended and the brightness can be improved. Can be improved.
• the discharge lamp electrode according to the present invention can further suppress ion sputtering by disposing an anti-scattering member around the coil portion.
• an anti-scattering member around the coil portion.
• the life can be further extended.
• the step of applying the electron emitting material and the like is performed while the heater is supported by the connection reinforcing member, so that deformation of the heater in the manufacturing process can be prevented.
• the yield is improved, and therefore, it is possible to inexpensively manufacture an electrode provided with a heater in which the coil portion is disposed in the longitudinal direction along the tube axis of the glass tube.
• the illumination device by providing the above-described discharge lamp, thinning and long life can be achieved.
• the present invention is a discharge lamp having a long life and a thin tube diameter, and therefore, the present invention is applied not only to lighting equipment, but also to backlights such as liquid crystal displays, to increase the efficiency, life, and thinness of liquid crystal displays. Can be implemented.

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