JP2008288194A - Mercury emitter, manufacturing method of discharge lamp using the same, discharge lamp, lighting system, and liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mercury emitter capable of introducing mercury in a glass tube and capable of amply removing impure gas in the glass tube. <P>SOLUTION: The mercury emitter 100, equipped with a mercury emission part 10, is constituted of a mercury alloy structured of mercury and a first metal capable of forming an alloy with mercury, and a coating layer 20 coating the mercury emission part 10, and in the covering layer 20 a getter material 30 is contained. The getter material is made of at least one type selected from among a group of tantalum (Ta), niobium (Nb), zirconium (Zr), chromium (Cr), titanium (Ti) and hafnium (Hf). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mercury emitter, a method of manufacturing a discharge lamp using the same, a discharge lamp, an illumination device, and a liquid crystal display device.

  Conventionally, when mercury is filled into a light-emitting tube (bulb) such as a cold cathode fluorescent lamp for backlight, liquid free mercury is automatically weighed using a mercury reeder, and this is filled into the bulb from the exhaust tube. (For example, refer to Patent Document 1). However, with such means, it has been difficult to accurately measure mercury when the amount of mercury to be sealed is small. In such a situation, in recent years, when filling with mercury, a mercury emitter impregnated with mercury is used.

  This mercury emitter is placed in a glass tube serving as an arc tube and heated by high frequency heating from the outside to release mercury. At this time, iron that does not form an alloy with mercury is used as a heat source that generates heat by high-frequency heating from the outside. Specifically, as shown in FIG. 1, there is a mercury emitter 1000 in which titanium and iron are mixed and sintered, and impregnated with mercury.

  In addition, as shown in FIG. 2, another mercury emitter 2000 is one in which an alloy 110 of titanium and mercury is held in a container 120 formed of a thin iron plate (see, for example, Patent Document 2). The container 120 is provided with a slit portion 130 for preventing bursting.

Further, Patent Document 3 discloses an annular sintered body made of a titanium mercury alloy as a mercury emitter disposed in a glass tube.
JP-A-5-121044 JP 2006-128142 A Japanese Patent No. 2965824

  In the mercury emitters disclosed in Patent Documents 2 and 3, a mercury releasing compound is used for adsorbing and fixing a trace amount of impure gas (for example, carbon oxide, water, oxygen or hydrogen) harmful to the action of the lamp. It has been proposed to use a mixture of getter metals.

  However, in the mercury emitters of Patent Documents 2 and 3, the impure gas cannot be sufficiently adsorbed, and therefore there remains a problem that the impure gas remains in the glass tube.

  This invention is made | formed in view of this point, The main objective is to provide the mercury discharge body which can fully remove the impurity gas in a glass tube while being able to introduce | transduce mercury into a glass tube.

  A mercury emitter according to the present invention includes a mercury emitting portion made of mercury and a mercury alloy of a first metal capable of forming an alloy with mercury, and a coating layer covering the mercury emitting portion, and the coating layer Contains getter material.

  In a preferred embodiment, the getter material is at least one selected from the group consisting of tantalum (Ta), niobium (Nb), zirconium (Zr), chromium (Cr), titanium (Ti), and hafnium (Hf). Made of materials.

  In a preferred embodiment, the first metal is at least one second metal selected from the group consisting of titanium (Ti), tin (Sn), zinc (Zn), and magnesium (Mg), and the coating. The layer is made of a material containing at least one metal selected from the group consisting of iron (Fe) and nickel (Ni).

  In a preferred embodiment, the coating layer includes a magnetic material.

  In a preferred embodiment, the mercury emitting portion has a cylindrical shape, and the covering layer has a cylindrical shape.

  In a preferred embodiment, the first metal is titanium (Ti), and the second metal is iron (Fe).

  In a preferred embodiment, a method for manufacturing a discharge lamp according to the present invention includes a step of inserting the mercury emitter into a glass tube and a step of heating the mercury emitter.

  A discharge lamp according to the present invention is a discharge lamp including a glass tube and a phosphor layer formed on an inner wall of the glass tube, and the mercury emitter is disposed in a part of the glass tube. .

  The illuminating device which concerns on this invention is an illuminating device provided with the said discharge lamp.

  The liquid crystal display device which concerns on this invention is a liquid crystal display device provided with the said illuminating device.

  According to the mercury emitter of the present invention, the getter material can be exposed on the surface of the mercury emitter since the covering layer covering the mercury emitting portion made of the mercury alloy contains the getter material. As a result, mercury can be introduced into the glass tube and impurities in the glass tube can be efficiently removed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, components having substantially the same function may be denoted by the same reference numerals for the sake of brevity. In addition, this invention is not limited to the following embodiment.
(First embodiment)
FIG. 3 is a perspective view showing an example of the configuration of the mercury emitter 100 according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of the mercury emitter 100 of the present embodiment.

  The mercury emitter 100 according to the present embodiment includes a mercury emitting part 10 made of mercury and a mercury alloy of a first metal capable of forming an alloy with mercury, and a coating layer 20 covering the mercury emitting part 10. In addition, the cover layer 20 includes a getter material 30. Here, the getter material 30 is shown for easy understanding in the drawings.

  The getter material 30 is a substance having a property of adsorbing a minute amount of impure gas (for example, carbon oxide, water, oxygen or hydrogen) harmful to the action of the lamp. The getter material 30 is made of, for example, at least one material selected from the group consisting of tantalum (Ta), niobium (Nb), zirconium (Zr), chromium (Cr), titanium (Ti), and hafnium (Hf).

 As described above, the mercury emitting unit 10 includes the first metal capable of forming an alloy with mercury. Here, the first metal is, for example, at least one metal selected from the group consisting of titanium (Ti), tin (Sn), zinc (Zn), and magnesium (Mg). An example of the first metal of the present embodiment is titanium (Ti).

Further, the mercury emitting portion 10 may contain one or more ceramics selected from titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and silicon oxide (SiO ₂ ). Since these ceramics do not react with mercury, when it is desired to reduce the amount of mercury impregnation while keeping the size of the mercury discharge portion 10 constant, the density of the mercury discharge portion 10 is increased to heat the mercury discharge portion 10. Efficiency can be increased. In addition, it is more preferable that the ceramic is contained within a range of 5 [wt%] to 30 [wt%] of the mercury emitting portion. More preferably, the ceramic is more preferably contained within a range of 10 wt% to 20 wt% of the mercury emission part.

  The covering layer 20 covering the mercury emitting portion 10 is made of a material containing at least one kind of metal (second metal) selected from the group consisting of iron (Fe) and nickel (Ni), for example. Here, the first metal is a “metal that forms an alloy with mercury”, while the second metal is a so-called “metal that does not form an alloy with mercury”. The covering layer 20 may be referred to as an inclusion part in that it covers the mercury emitting part 10.

  “Metal that does not form an alloy with mercury” means that it reacts with mercury, such as iron (Fe), nickel (Ni), cobalt (Co), manganese (Mn), and at least two of these alloys. A metal that is difficult to form an alloy. Among these, in view of chemical properties and industrial productivity (cost and the like), a material containing at least one metal selected from the group consisting of iron (Fe) and nickel (Ni) is preferable.

  In addition, the 2nd metal which comprises the coating layer 20 is not restricted to one kind of metal of iron (only) or nickel (only), For example, the mixture of iron and nickel can also be used, or nickel Plated iron can also be used. The second metal in which iron is nickel-plated can exhibit the effect of preventing oxidation (preventing corrosion) of iron.

  Moreover, it is preferable that the coating layer 20 contains a magnetic material so that the mercury emitter 100 can be moved by a magnetic force during the mercury introduction step. Also in this respect, the covering layer 20 is preferably made of, for example, iron (Fe) or nickel (Ni). An example of the second metal of the present embodiment is iron (Fe).

  The mercury emitter 100 in the illustrated example includes a columnar mercury discharge portion 10 and a cylindrical coating layer 20. The cover layer 20 includes a getter material 30 and the getter material 30 is exposed on the surface of the cover layer 20 (or the mercury emitter 100), so that impurities in the glass tube constituting the lamp are efficiently removed. Can be removed well.

  The dimensions of the configuration shown in FIG. 3 are exemplarily shown as follows. The diameter of the cylindrical mercury discharge part 10 is 1 [mm], and the length (height) in the longitudinal direction is 3 [mm]. The thickness of the cylindrical coating layer 20 is 0.2 [mm], and the length (height) in the longitudinal direction is 3 [mm].

  FIG. 5 is a partially cutaway perspective view for explaining the mercury emitter 100 of the present embodiment. In the mercury emitter 100 shown in FIG. 5, since the getter material 30 is included in the coating layer 20 exposed on the surface, impurities 32 existing outside (for example, carbon oxide, water, oxygen, hydrogen, etc.) Can be efficiently adsorbed (see arrow 35).

  In the example of the mercury emitter 100 shown in FIG. 5, the coating layer 20 is formed of a sintered body portion. In the case of the structure, mercury is released from the mercury releasing part 10 to the outside through a gap (gap existing in the sintered body part) existing in the coating layer 20 made of the sintered body part during heating. On the other hand, the impurities 32 are also adsorbed by the getter material 30 exposed in the gaps existing in the coating layer 20 made of the sintered body portion, and therefore the impurities can be efficiently removed.

  Moreover, FIG. 6 has shown the example which comprised the coating layer 20 from multiple layers (20A, 20B). In the example shown in FIG. 6, the coating layer 20 is composed of an outer layer 20A and an inner layer 20B, and the outer layer 20A includes a getter material 30. In this example, the inner layer 20B does not include the getter material 30, but the inner layer 20B may include the getter material 30.

  In the coating layer 20 shown in FIG. 6, the inner layer 20 </ b> B can be used as a sintered body portion, and the outer layer 20 </ b> A can be formed from other materials (for example, metal). When the outer layer 20A has a structure that does not allow mercury to pass therethrough, a through hole or the like may be formed in the outer layer 20A, and the getter material 30 may be disposed in the hole portion. Furthermore, although the coating layer 20 shown in FIG. 6 has a two-layer structure, it may have a three-layer structure or more.

  FIG. 7 shows a configuration (comparative example 1000A) in which a getter material 30 is included in a mercury emitting portion 110A made of a mercury alloy of mercury and a first metal. In this comparative example 1000A, the coating layer 20 of this embodiment does not exist, and the getter material 30 is mixed in the mercury emitting portion 110A.

  According to the comparative example 1000A shown in FIG. 7, since the getter material 30 is mixed in the mercury discharge portion 110A, the impurities (impure gas) 132 released together with mercury from the mercury discharge portion 110A during heating are again adsorbed. Is difficult (see arrow 135). That is, it is difficult for the getter material 30 located inside the mercury emitting portion 110 </ b> A to touch the impure gas 132. Therefore, the effect of the getter material 30 located inside the mercury emitting portion 110A is remarkably bad.

  Here, when the amount of the getter material 30 to be mixed into the mercury emitting portion 110A is greatly increased, the amount of the getter material 30 located on the surface of the mercury emitting portion 110A also increases, so that the getter effect is increased. However, in this case, since the amount of the first metal (for example, titanium) to be reacted with mercury is inevitably reduced, the role of the mercury emitting portion 110A is reduced this time. That is, in the configuration of Comparative Example 1000A, it is difficult to concentrate the getter material only on the outer surface due to the structure. Needless to say, excessive mixing of the getter material 30 is not preferable because it causes a significant increase in cost.

  FIG. 8 shows a configuration (comparative example 2000A) in which the getter material 30 is included in the mercury emitting portion 110B. The comparative example 2000A shown in FIG. 8 has basically the same configuration as the mercury emitter 2000 shown in FIG. 2, and the mercury emitter 110B is held in a container 120 formed of a thin iron plate. Has been. The container 120 is provided with a slit portion 130.

  The comparative example 2000A shown in FIG. 8 has the same problem as the comparative example 1000A shown in FIG. In the case of the comparative example 2000A, since the getter material 30 is contained in the mercury emitting portion 110B, it is difficult for the getter material 30 located inside the mercury emitting portion 110B to touch the impure gas 132. In particular, in Comparative Example 2000A, the container 120 formed of an iron thin plate does not transmit gas, and therefore can contact only the getter material 30 located on the surface of the mercury discharge portion 110B exposed from the slit 130. Therefore, the effect of the getter material 30 in the comparative example 2000A is remarkably bad.

  Next, the mercury emitter 100 of this embodiment can be used as shown in FIG. 9, and the characteristics of the mercury emitter 100 can be examined by the method of use.

  First, as shown in FIG. 9A, a clear valve (glass tube) 210 is prepared. The length of the clear valve 210 in the longitudinal direction is 40 [cm], and the sealed gas component 220 in the clear valve 210 is Ne95 [Vol%] + Ar5 [Vol%]. A heater used for heating and exhausting can be disposed on the outer periphery of the clear valve 210.

Here, the mercury emitter (hereinafter referred to as Hg pellet) is not disposed in the clear valve 210, but is exhausted and sealed, and the partial pressure of the impure gas component is measured. The partial pressure is measured using a quadrupole mass spectrometer. The impure gas to be measured is, for example, H ₂ (hydrogen), CO ₂ (carbon dioxide), H.P. C. (Hydrocarbon), N ₂ + CO (nitrogen + carbon monoxide).

  Next, as shown in FIG. 9B, after putting the Hg pellet 100 into the clear valve 210, the clear valve 210 is exhausted and sealed, and the partial pressure of the impure gas component is measured. Next, as shown in FIG. 9C, the Hg pellet 100 disposed in the clear valve 210 is subjected to high-frequency heating for 1 minute to measure the partial pressure of the impure gas component. High frequency heating is performed using a high frequency heater 250. This heating releases mercury 240 (actually mercury vapor) from the Hg pellet 100 (see arrow 245).

  Finally, as shown in FIG. 9D, the clear valve 210 is heated at 350 [° C.] to 400 [° C.] for 5 minutes (mercury feeding step), and the partial pressure of the impure gas component is measured. This heating is performed by the electric furnace 260. After heating, the Hg pellet 100 is chipped off.

  When the mercury introduction process is executed using the mercury emitter 100 of the present embodiment, the coating layer 20 including the getter material 30 is located on the surface of the mercury emitter 100 and the getter material 30 is exposed, so that glass Mercury can be introduced into the tube 210 (see arrow 245), and impurities in the glass tube 210 can be efficiently removed.

  Next, a method for manufacturing the mercury emitter 100 according to this embodiment will be described. A process diagram of the manufacturing process is shown in FIG.

  As shown in FIG. 10, first, raw material powder is prepared. Specifically, for example, titanium powder that is a material of the mercury discharge part (mercury alloy part) 10 or iron powder that is a material of the coating layer (in one example, a metal sintered body part) 20. A getter material 30 is also prepared.

(Mixing / kneading process)
Next, titanium powder and iron powder are separately mixed with a binder, various additives, and water, and sufficiently kneaded. The binder is, for example, methyl cellulose. Thereby, a titanium goblet and an iron goblet are produced. And getter material 30 is mixed in iron powder, and iron goat earth containing getter material is produced.

(Extrusion process)
Next, the titanium goblet and the iron goblet are put into first and second extrusion molding machines (not shown), respectively. This second molding machine is provided with a coaxial two-layer extrusion die. Then, a rod-shaped titanium molded body is derived from the first extrusion molding machine, the titanium molded body is introduced into a die part of the second extrusion molding machine, and a cylindrical body having a coaxial structure in which iron gourd is laminated on the outside. A shaped molded body is continuously formed. Then, this molded object is dried until it becomes predetermined | prescribed hardness. The molding method is not limited to extrusion molding, and press molding or a method of forming titanium clay in a rod shape and then dipping it into slurryed iron can be used.

(Cut process)
Next, the molded body is cut to a predetermined length. Depending on the length to be cut, the mercury impregnation amount in the mercury emitter 100 can be adjusted to a desired amount. In addition, the mercury impregnation amount of the mercury emitter 100 can be adjusted by changing the binder amount of the titanium clay, the outer diameter of the mercury alloy portion 101, the firing temperature in the firing step, and the like.

(Sintering process)
Next, the compact is heated in an argon atmosphere at, for example, 500 [° C.] to remove the binder in the compact. And it sinters, for example at 900 [degreeC] in a vacuum atmosphere, and a sintered compact is produced.

(Mercury impregnation process)
After that, the sintered body and mercury are put into a heating container, and the heating container is evacuated using a vacuum pump, and at a temperature of about 500 [° C.] to 600 [° C.] for a long time, for example, 12 [h] to 15 [ h] Heat about to alloy titanium and mercury.

  At this time, since iron does not form an alloy with mercury, mercury does not remain in the iron sintered body, and an alloy of titanium and mercury is formed in the titanium sintered body, whereby the mercury emitter 100 is completed.

  Next, another method for manufacturing the mercury emitter 100 according to this embodiment will be described.

  First, raw material powder is prepared. Specifically, a mercury alloy powder (for example, an alloy powder of titanium and mercury) is prepared as a material for the mercury emitting portion 10. Next, the mercury discharge part 10 is shape | molded by compression molding etc. from the alloy powder, and the cylindrical mercury discharge part 10 is produced in this embodiment.

  Further, a through-hole penetrating the sheet member made of iron (Fe) or nickel (Ni) is formed, and the through-hole is filled with the getter material 30. The covering layer 20 is formed by winding the sheet member in which the through hole is filled with the getter material 30 around the mercury emitting portion 10, and the mercury emitting body 100 of this embodiment can be manufactured.

  Alternatively, it is also possible to produce the mercury emitter 100 by inserting the mercury emitter 10 into the cylindrical (for example, cylindrical) coating layer 20. In that case, a through hole may be provided in the coating layer 20 and the getter material 30 may be filled in the through hole.

  Next, a method for manufacturing a fluorescent lamp, which is a kind of low-pressure discharge lamp, will be described as an example of a method for manufacturing a discharge lamp using the mercury emitter 100 with reference to FIGS.

(Process A)
First, the prepared straight tubular glass tube 300 is dipped in the phosphor suspension 302 in the tank 301 by dropping the lower end portion thereof. The phosphor suspension 302 includes, for example, blue, red, and green phosphor particles. By making the inside of the glass tube 300 have a negative pressure, the phosphor suspension 302 in the tank 301 is sucked up and applied to the inner surface of the glass tube 300. This siphoning is set so that the liquid level becomes a predetermined height of the glass tube 300 by detecting the liquid level with the optical sensor 303. The liquid level error at this time is relatively large because of the influence of the viscosity of the phosphor suspension 302, the surface tension of the liquid level, and the like, and an error of about ± 0.5 [mm] occurs.

(Process B)
Next, the glass tube 300 is opened to the atmosphere, and then the lower end portion of the glass tube 300 is pulled up from the phosphor suspension 302, and the phosphor suspension 302 inside the glass tube 300 is discharged to the outside. As a result, the phosphor suspension is applied in a film form to a predetermined region on the inner periphery of the glass tube 300.

  Subsequently, after drying the phosphor suspension 302 applied in the glass tube 300, a brush or the like 304 is inserted into the inner surface of the glass tube 300 to remove an unnecessary phosphor portion at the end of the glass tube 300. .

  Subsequently, the glass tube 300 is transferred into a heating furnace (not shown) and baked to obtain a phosphor film 305.

(Process C)
Thereafter, the electrode unit 309 including the electrode 306, the bead glass 307, and the lead wire 308 is inserted into one end of the glass tube 300 on which the phosphor film 305 is formed, and then temporarily fixed. Temporary fixing means that the outer peripheral portion of the glass tube 300 where the bead glass 307 is located is heated by the burner 310 and a part of the outer periphery of the bead glass 307 is fixed to the inner peripheral surface of the glass tube 300. Since only a part of the outer periphery of the bead glass 307 is fixed, the air permeability of the glass tube 300 in the tube axis direction is maintained.

(Process D)
Next, the glass tube 300 is turned upside down, and the electrode 311, the bead glass 312, and the lead wire having substantially the same configuration as the electrode unit 309 are placed on the glass tube 300 from the side opposite to the side where the electrode unit 309 is inserted. After inserting the electrode unit 314 containing 313, the outer peripheral part of the glass tube 300 in which the bead glass 312 is located is heated with the burner 315, and the glass tube 300 is sealed and airtightly sealed (first sealing). Further, the error from the set value of the sealing position in the first sealing is about 0.5 [mm].

  In addition, the insertion position of the electrode unit 309 in the process C and the insertion of the electrode unit 314 in the process D are different in the length of the absence region of the phosphor layer 405 extending from both ends of the glass bulb 402 after sealing, which will be described later. It is preferable that the amount of insertion is adjusted so as to be in such a position.

In this case, the electrode unit 314 on the other end side is inserted deeper than the position overlapping the phosphor film 305 compared to the electrode unit 309 on the one end side. The reason why such a configuration is suitable is as follows. That is, there is often a difference in the thickness of the phosphor layer 405 between one end and the other end of the lamp, and when a plurality of lamps are installed in an illumination device such as a backlight unit in the same direction, illumination is performed. Luminance unevenness occurs as a whole device. In order to prevent this, for example, it can be considered that one end and the other end of the lamp are alternately incorporated in the lighting device.

This is because one end and the other end of the lamp can be automatically and easily identified using a sensor or the like. If an image sensor of 2 million [pixels] is used as the sensor, 1 [pixel] can be set to 0.1 [mm], so that measurement accuracy in units of 0.1 [mm] can be realized.

  Considering these circumstances, if the difference in the length of the non-existing region of the phosphor layer 405 is at least 2 [mm] between the one end portion side and the other end portion side of the glass bulb 401, the sensor is surely mounted. Can be used to identify the longitudinal orientation.

  In addition, if the difference in the length of the non-existence region of the phosphor layer 405 is at least 3 [mm] between the one end side and the other end side of the glass bulb 401, the sensor can be used more reliably in the longitudinal direction. Can be identified. In this case, the image sensor may have a measurement accuracy in units of 0.5 [mm]. Moreover, the upper limit of the difference in length is, for example, about 8 [mm]. This is because if it exceeds 8 [mm], the non-existing region of the phosphor layer 405 that does not contribute to light emission becomes long, and it becomes difficult to ensure an effective light emission length.

(Process E)
Subsequently, a portion of the glass tube 300 between the electrode unit 309 and the end of the glass tube 300 closer to the electrode unit 309 is heated by the burner 316 to reduce the diameter, thereby forming a constricted portion 300a. . Thereafter, the mercury emitter 100 according to the present embodiment is put into the glass tube 300 from the end portion and is hooked on the constricted portion 300a.

(Process F)
Subsequently, exhaust in the glass tube 300 and filling of the sealed gas into the glass tube 300 are sequentially performed. Specifically, the head of the air supply / exhaust device (not shown) is attached to the end of the glass tube 300 on the mercury emitter 100 side, and first, the inside of the glass tube 300 is evacuated to a vacuum, and the heating device (FIG. The entire glass tube 300 is heated from the outer periphery by not shown). Thereby, the impure gas in the glass tube 300 including the impure gas entering the phosphor film 305 is discharged. This impure gas can also be adsorbed by the mercury emitter 100. After the heating is stopped, a predetermined amount of sealed gas (for example, a mixed rare gas such as a mixed gas of argon: 95 [Vol%], neon: 5 [Vol%]) is filled.

(Process G)
When the filled gas is filled, the end of the glass tube 300 on the mercury emitter 100 side is heated by the burner 317 and sealed.

(Process H)
Subsequently, in a process H shown in FIG. 12, the mercury emitter 100 is induction-heated by a high-frequency oscillation coil (not shown) arranged around the glass tube 300 to release mercury from the mercury emitter 100 (mercury extraction process). ). The impurity gas (impurities) released during the mercury extraction process can be adsorbed by the getter material 30 of the mercury emitter 100 of the present embodiment.

  As a method for heating the mercury emitter 100, various known methods such as light heating can be used. Thereafter, the glass tube 300 is heated in the heating furnace 318, and the released mercury is moved toward the electrode 311 of the electrode unit 314.

(Process I)
Next, the outer peripheral part of the glass tube 300 where the bead glass 307 is located is heated by a burner 319, and the glass tube 300 is sealed and hermetically sealed. The error from the set value of the sealing position of the one end is about ± 0.5 [mm] as in the other end.

(Process J)
Subsequently, in the glass tube 300, the end portion on the mercury emitter 100 side is cut off from the sealing portion at the one end portion. This completes the discharge lamp.

  As described above, according to the configuration of the method for manufacturing a discharge lamp according to the present embodiment, mercury can be introduced into the glass tube 300 and impurities in the glass tube 300 can be efficiently removed.

  In addition, when mercury is released by high-frequency heating, in the mercury emitter 1000 shown in FIG. 1, heating efficiency is not good because iron as the heat source is scattered randomly in the mercury emitter 1000. There is also a problem.

  Further, since the mercury emitter 2000 shown in FIG. 2 has the slit 130 formed in the container 120, at least the effect of the eddy current is reduced by the division of the slit 130, and as a result, the heating efficiency is lowered. There is also a problem. On the other hand, if the slits 130 are not provided in the container 120, the mercury outlet is blocked, and the mercury emission efficiency is reduced accordingly.

  According to the mercury emitter 100 of the present embodiment, the coating layer 20 covers the periphery of the mercury emitting portion 10, and these problems can be solved. That is, in the mercury emitter 100 of this embodiment, unlike the mercury emitter 1000 shown in FIG. 1, iron as the heat source is not randomly distributed in the mercury emitter 1000. The heating efficiency can be improved as compared with the mercury emitter 1000 shown in FIG. And unlike the mercury emitting body 2000 shown in FIG. 2, since the slit 130 is not formed, the fall of the heating efficiency at the time of high frequency heating can be suppressed.

  Therefore, in this embodiment, since the mercury emitter 100 with high mercury emission efficiency is used, the amount of mercury impregnated in the mercury emitter 100 can be reduced, in other words, the amount of mercury used for the lamp is reduced. Can reduce the burden on the environment.

  11 and 12, the fluorescent lamp has been described as a specific example of the discharge lamp. However, the present invention can also be applied to an ultraviolet lamp in which the phosphor layer is not formed on the inner surface of the glass tube.

(Second Embodiment)
Next, a discharge lamp 400 (hereinafter simply referred to as “lamp 400”) according to a second embodiment of the present invention will be described. A sectional view including the tube axis of the lamp 400 is shown in FIG. 13A, and an enlarged sectional view of the portion A is shown in FIG. 13B. As shown in FIG. 13A, the lamp 400 is a cold cathode fluorescent lamp which is a kind of low-pressure discharge lamp. Although manufactured by the method of manufacturing a low-pressure discharge lamp according to the above-described embodiment, the mercury emitter 401 remains in the lamp 400, unlike the discharge lamp in Step J shown in FIG. .

  The lamp 400 includes a glass bulb 402, an electrode 403, and a lead wire 404. The glass bulb 402 has a straight tube shape, and has a substantially circular cross section cut perpendicular to the tube axis. The glass bulb 402 has, for example, an outer diameter of 3.0 [mm], an inner diameter of 2.0 [mm], and a total length of 750 [mm], and the material thereof is borosilicate glass. The dimensions of the lamp 400 shown below are values corresponding to the dimensions of the glass bulb 402 having an outer diameter of 3.0 [mm] and an inner diameter of 2.0 [mm]. In the case of a cold cathode fluorescent lamp, the inner diameter is in the range of 1.4 [mm] to 7.0 [mm], and the wall thickness is in the range of 0.2 [mm] to 0.6 [mm], It is preferable that the total length is 1500 [mm] or less. These values are examples and are not limited to these.

  Inside the glass bulb 402, mercury is sealed at a predetermined ratio with respect to the volume of the glass bulb 402, for example, 0.6 [mg / cc], and a rare gas such as argon or neon is sealed at a predetermined sealing pressure, For example, it is sealed at 60 [Torr]. As the rare gas, a mixed gas having a mixing ratio of argon and neon (Ar = 5 [Vol%], Ne = 95 [Vol%]) is used.

A phosphor layer 405 is formed on the inner surface of the glass bulb 402. The phosphor particles used for the phosphor layer 405 are, for example, red phosphor particles (Y ₂ O ₃ : Eu ³⁺ ), green phosphor particles (LaPO ₄ : Ce ³⁺ , Tb ³⁺ ), and blue phosphor particles (BaMg ₂ Al). ₁₆ O ₂₇ : Eu ²⁺ ).

  Further, a protective film (not shown) of a metal oxide such as yttrium oxide (Y2O3) may be provided between the inner surface of the glass bulb 402 and the phosphor layer 405.

  Further, lead wires 404 are led out from both ends of the glass bulb 402 to the outside. The lead wires 404 are sealed at both ends of the glass bulb 402 through bead glass 406.

  The lead wire 404 is, for example, a connecting line composed of an internal lead wire 404a made of tungsten and an external lead wire 404b made of nickel. The inner lead wire 404a has a wire diameter of 1 [mm] and a total length of 3 [mm], and the outer lead wire 404b has a wire diameter of 0.8 [mm] and a total length of 5 [mm].

  A hollow type, for example, a bottomed cylindrical electrode 403 is fixed to the tip of the internal lead wire 404a. This fixing is performed using, for example, laser welding.

  The dimensions of each part of the electrode 403 are, for example, an electrode length of 5 [mm], an outer diameter of 1.70 [mm], an inner diameter of 1.50 [mm], and a wall thickness of 0.10 [mm].

  As shown in FIG. 13B, a mercury emitter 401 is fixed between the electrode 403 and the bead glass 406 of at least one internal lead 404a. The mercury emitter 401 is formed by forming a through-hole 401a for passing an internal lead wire through the mercury emitter 100 according to the present embodiment. Note that the mercury emitter 401 may be fixed to the electrode 403 instead of the lead wire 404.

  According to the configuration of the discharge lamp 400 according to the present embodiment, since the mercury emitter 401 having the getter effect is disposed in the glass bulb 402, the impure gas generated from the phosphor layer can be adsorbed while the lamp is turned on. Thus, it is possible to obtain an effect that deterioration of optical characteristics can be suppressed.

  In addition, since the discharge lamp 400 of the present embodiment uses the mercury emitter 401 with high mercury emission efficiency, the amount of mercury impregnated in the mercury emitter 401 can be reduced, in other words, the mercury to the lamp can be reduced. The amount used can be reduced, and the load on the environment can be reduced.

(Third embodiment)
Next, a discharge lamp 500 (hereinafter simply referred to as “lamp 500”) according to a third embodiment of the present invention will be described. FIG. 14A shows a cross-sectional view including the tube axis of the lamp 500, and FIG. 14B shows an enlarged cross-sectional view of the B portion.

  As shown in FIG. 14A, the lamp 500 is a hot cathode fluorescent lamp which is a kind of low-pressure discharge lamp. Then, the mercury emitter 401 remains inside the lamp 500.

  The lamp 500 is a hot cathode fluorescent lamp and includes a glass bulb 501 and an electrode mount 502. The glass bulb 501 has, for example, a total length of 1010 [mm], an outer diameter of 18 [mm], and a wall thickness of 0.8 [mm], and electrode mounts 502 are sealed at both ends thereof.

  A phosphor layer 405 is formed on the inner surface of the glass bulb 501, and mercury (eg, 4 [mg] to 10 [mg]) is sealed inside the glass bulb 501, and argon ( A mixed gas of Ar) and krypton (Kr) (for example, a mixed gas having a partial pressure ratio of Ar of 50 [%] and Kr of 50 [%]) is sealed at a sealed gas pressure of 600 [Pa], for example.

  As shown in FIG. 14A, the electrode mount 502 is a so-called bead glass mount, a tungsten filament electrode 503, a pair of lead wires 504 that support the filament electrode 503, and the pair of lead wires 504. And a bead glass 505 for fixing and supporting.

  As shown in FIG. 14B, the mercury emitter 401 is fixed to the lead wire 504 of at least one of the electrode mounts 502. However, the through hole 401 a of the mercury emitter 401 used here is adapted to the wire diameter of the lead wire 504.

  A part of the lead wire 504 is sealed at the end of the glass bulb 501 in the electrode 502, specifically, a part extending from the bead glass 505 to the opposite side to the filament electrode 503. . The electrode mount 502 is sealed to the glass bulb 501 by, for example, a pinch seal method.

  Note that an exhaust pipe remaining portion 506 is attached together with the electrode 502 to at least one end of the glass bulb 501. This exhaust pipe remaining part 506 is used when exhausting the inside of the glass bulb 501 after sealing the electrode mount 502 or enclosing the above-mentioned enclosed gas or the like. When the sealing is completed, for example, chip-off sealing is performed at a portion of the exhaust pipe remaining portion 506 located outside the glass bulb 501.

  According to the configuration of the discharge lamp 500 according to the present embodiment, since the mercury emitter 401 having the getter effect is disposed in the glass bulb 501, the impure gas generated from the phosphor layer can be adsorbed while the lamp is lit. Thus, it is possible to obtain an effect that deterioration of optical characteristics can be suppressed.

  In addition, since the discharge lamp 500 of the present embodiment uses the mercury emitter 401 having a high mercury emission efficiency, the amount of mercury impregnated in the mercury emitter 401 can be reduced, in other words, mercury for the lamp. Can be used and the load on the environment can be reduced.

(Fourth embodiment)
Next, the illuminating device 600 which concerns on the 4th Embodiment of this invention is demonstrated. FIG. 15 is an exploded perspective view of the illumination device 600 of the present embodiment.

  The illumination device 600 according to the fourth embodiment of the present invention is a direct-type backlight unit. The lighting device 600 includes a rectangular parallelepiped housing 601 with one open surface, a plurality of lamps 400 housed in the housing 601, and the lamp 400 electrically connected to a lighting circuit (not shown). A pair of sockets 602 and optical sheets 603 that cover the opening of the housing 601 are provided. The lamp 400 is the discharge lamp 400 according to the present embodiment.

  The housing 601 is made of, for example, polyethylene terephthalate (PET) resin, and a reflective surface 604 is formed by depositing a metal such as silver on the inner surface thereof. In addition, as a material of the housing | casing 601, you may comprise by metal materials, such as materials other than resin, for example, aluminum, a cold rolled material (for example, SPCC). Further, as the reflection surface 604 on the inner surface, other than the metal vapor-deposited film, for example, a reflection sheet whose reflectance is increased by adding calcium carbonate, titanium dioxide or the like to polyethylene terephthalate (PET) resin is used. May be.

  Inside the housing 601, a socket 602, an insulator 605, and a cover 606 are disposed. Specifically, the sockets 602 are provided at predetermined intervals in the lateral direction (vertical direction) of the housing 601 corresponding to the arrangement of the lamps 400. The socket 602 is obtained by processing a plate material made of stainless steel or phosphor bronze, for example, and has a fitting portion 602a into which the external lead wire 404b is fitted. Then, the external lead wire 404b is elastically deformed and fitted so as to expand the fitting portion 602a. As a result, the external lead wire 404b fitted into the fitting portion 602a is pressed by the restoring force of the fitting portion 602a and is difficult to come off. Thereby, the external lead wire 404b can be easily fitted into the fitting portion 602a, but can be made difficult to come off.

  The socket 602 is covered with an insulator 605 so as not to short-circuit between adjacent sockets 602. The insulator 605 is made of, for example, polyethylene terephthalate (PET) resin. Note that the insulator 605 is not limited to the above structure. Since the socket 602 is in the vicinity of the internal electrode 403 that becomes relatively high during the operation of the lamp 400, the insulator 605 is preferably made of a heat-resistant material. As a material for the heat-resistant insulator 605, for example, polycarbonate (PC) resin, silicon rubber, or the like can be used.

  A lamp holder 607 may be provided inside the housing 601 at a place where necessary. The lamp holder 607 that fixes the position of the lamp 400 inside the housing 601 is, for example, polycarbonate (PC) resin, and has a shape that conforms to the outer shape of the lamp 400. The “place as needed” means that the lamp 400 is bent when the lamp 400 is long, for example, exceeding a total length of 600 [mm], such as near the central portion in the longitudinal direction of the lamp 400. It is a place necessary to eliminate.

  The cover 606 divides the socket 602 and the space inside the housing 601 and is made of, for example, polycarbonate (PC) resin, keeps the periphery of the socket 602 warm, and highly reflects at least the surface on the housing 601 side. Therefore, a reduction in luminance at the end of the lamp 400 can be reduced.

  The opening of the housing 601 is covered with a light-transmitting optical sheet 603 and is sealed so that foreign matters such as dust and dust do not enter inside. The optical sheet 603 is formed by laminating a diffusion plate 608, a diffusion sheet 609, and a lens sheet 610.

  The diffusion plate 608 is a plate-like body made of, for example, polymethyl methacrylate (PMMA) resin, and is disposed so as to close the opening of the housing 601. The diffusion sheet 609 is made of, for example, a polyester resin. The lens sheet 610 is, for example, a laminate of an acrylic resin and a polyester resin. These optical sheets 603 are arranged so as to be sequentially superimposed on the diffusion plate 608.

  According to the configuration of the illumination device 600 according to the present embodiment, since the mercury emitter 401 can adsorb impure gas in the lamp 400, it is possible to realize a light source that suppresses deterioration of optical characteristics. In addition, since a lamp with a small amount of mercury used is used, a backlight unit with a low environmental load can be realized.

(Fifth embodiment)
Next, a lighting apparatus 700 according to the fifth embodiment of the present invention will be described. FIG. 16 is a partially cutaway perspective view of the illumination device 700 of the present embodiment.

  The illumination device 700 according to the present embodiment is an edge light type backlight unit, and includes a reflector 701, a lamp 400, a socket (not shown), a light guide plate 702, a diffusion sheet 703, and a prism sheet 704.

  The reflection plate 701 is disposed so as to surround the periphery of the light guide plate 702 except for the liquid crystal panel side (arrow Q), and the side surface covering the bottom surface portion 701b covering the bottom surface and the side surface excluding the side where the lamp 400 is disposed. 701a and a curved lamp side surface portion 701c that covers the periphery of the lamp 400, and reflects light emitted from the lamp from the light guide plate 702 to the liquid crystal panel (not shown) side (arrow Q). . Further, the reflecting plate 701 is made of, for example, a film-like PET deposited with silver or a laminate of a metal foil such as aluminum.

  The socket has substantially the same configuration as the socket 602 used in the lighting device 600 according to the above-described fourth embodiment. In FIG. 16, the end of the lamp 400 is omitted for convenience of illustration.

  The light guide plate 702 is for guiding the light reflected by the reflection plate to the liquid crystal panel side. The light guide plate 702 is made of, for example, translucent plastic, and is stacked on the reflection plate 701 a provided on the bottom surface of the lighting device 700. Has been. As a material, polycarbonate (PC) resin or cycloolefin-based resin (COP) can be applied.

  The diffusion sheet 703 is for expanding the visual field, and is made of a film having a diffusion transmission function made of, for example, polyethylene terephthalate resin or polyester resin, and is stacked on the light guide plate 702.

  The prism sheet 704 is for improving luminance, and is made of, for example, a sheet obtained by bonding an acrylic resin and a polyester resin, and is laminated on the diffusion sheet 703. A diffusion plate may be further laminated on the prism sheet 704.

  In the present embodiment, a reflective sheet (not shown) is provided on the outer surface of the glass bulb 402 except for a part in the circumferential direction of the lamp 400 (on the light guide plate 702 side when inserted into the backlight unit 700). Aperture type lamps may also be used.

  According to the configuration of the illumination device 700 according to the present embodiment, since the mercury emitter 401 can adsorb impure gas in the lamp 400, it is possible to realize a light source in which deterioration of optical characteristics is suppressed. In addition, since a lamp with a small amount of mercury used is used, a backlight unit with a low environmental load can be realized.

(Sixth embodiment)
FIG. 17 shows an outline of a liquid crystal display device according to the sixth embodiment of the present invention. As shown in FIG. 17, the liquid crystal display device 800 is, for example, a 32 [inch] television, and includes a liquid crystal screen unit 801 including a liquid crystal panel and the like, an illumination device 600 according to the fourth embodiment of the present invention, and a lighting circuit 802. Prepare.

  The liquid crystal screen unit 801 is a known one and includes a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a drive module, etc. (not shown), and is based on an image signal from the outside. To form a color image.

  The lighting circuit 802 lights the lamp 400 inside the lighting device 600. The lamp 400 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 3.0 [mA] to 25 [mA].

  Note that although FIG. 17 illustrates the case where the discharge lamp 400 is inserted into the above-described lighting device 600 as the light source device of the liquid crystal display device 800, the present invention is not limited thereto, and the above-described discharge lamp 500 can also be applied. In addition, the above-described lighting device 700 can also be used for the lighting device.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible.

  For example, in the case of the mercury alloy part 100 shown in FIG. 5, the porosity of the porous coating layer 20 is preferably 5% or more. In this case, mercury can easily pass through the coating layer 20, and the mercury impregnation efficiency and emission efficiency can be increased. In particular, the porosity of the coating layer 20 is more preferably 25 [%] or more. In this case, the mercury emitted from the mercury emitting part 10 is more likely to pass through the coating layer 20, and the mercury emission efficiency can be further increased. In addition, it is preferable that the porosity of the coating layer 20 is 60 [%] or less. If it is larger than 60 [%], the coating layer 20 becomes full of holes. For example, when the mercury emitter 100 is heated at a high frequency, the heating efficiency of the mercury emitting portion 101 is lowered and heating unevenness easily occurs. This is because the amount of released mercury will vary.

  The porosity of the coating layer 20 is calculated by the following mathematical formula.

Porosity [%] = {1− (density of coating layer / theoretical density of coating layer)} × 100
The density of the coating layer 20 is determined by examining the composition ratio of the mercury emitter 100 by ICP emission analysis and multiplying the weight of the mercury emitter by the composition ratio of the elements constituting the coating layer 20. , By dividing by the volume of the coating layer 20. Here, since the coating layer 20 is porous and it is difficult to determine its exact volume, the volume of the coating layer 20 is the volume when there is no void in the clothing layer 20. Further, the theoretical density of the coating layer 20 is an imaginary density determined on the assumption that the coating layer 20 has no voids.

  Moreover, when using what mixed nickel powder with iron powder when shape | molding the coating layer 20, while being able to improve corrosion resistance rather than the case of only iron powder, it is particle size by the blend of iron powder and nickel powder. The variation of can be expanded. If the variation of the particle diameter can be widened, it becomes easy to control the porosity (and hence the thermal conductivity) of the coating layer 20. Moreover, the fluidity | liquidity can also be improved in the blend powder of iron powder and nickel powder, and it becomes possible to improve the productivity at the time of shaping | molding. In addition, since nickel has a lower specific heat and higher thermal conductivity than iron, the heating efficiency of the coating layer 20 can also be improved.

  The outer diameter of the mercury emitting portion 10 is preferably 30% or more of the outer diameter of the mercury emitting body 100. In this case, the heat for heating the coating layer 20 is easily transmitted to the mercury emitting portion 10 by high-frequency heating, the mercury emitting portion 10 can be efficiently heated, and the mercury emission efficiency can be further improved. In particular, the ratio of the outer diameter of the mercury emitter 10 to the outer diameter of the mercury emitter 100 is 60% or more in order to heat the mercury emitter 10 more efficiently and further improve the mercury emission efficiency. It is more preferable. In addition, it is preferable that the ratio with respect to the outer diameter in the mercury emitter 100 of the outer diameter in the mercury discharge | release part 10 is 95 [%] or less. This is because if it exceeds 95 [%], it is difficult for the coating layer 20 to secure a sufficient heat capacity for heating the mercury emitting portion 10, and the heating efficiency of the mercury emitting portion 10 may be reduced.

  The thickness of the coating layer 20 is preferably 10 [μm] or more. This is because when the thickness of the coating layer 20 is smaller than 10 [μm], it is difficult to manufacture. Furthermore, from the viewpoint of the heating efficiency of the mercury emitting portion 10 by high frequency heating, the thickness of the coating layer 20 is more preferably 50 [μm] or more and 250 [μm] or less.

  Furthermore, the surface roughness (Ra) of the outer surface of the coating layer 20 is preferably 1 or more. In this case, the outer surface area of the coating layer 102 can be increased, the heating efficiency of the mercury discharge portion 10 can be increased to increase the mercury emission efficiency, and the impurity gas adsorption efficiency can be increased. In particular, the surface roughness (Ra) of the outer surface of the coating layer 20 further increases the outer surface area of the coating layer 20, further increases the heating efficiency of the mercury discharge unit 10, further increases the mercury emission efficiency, In order to adsorb, it is more preferably 2 or more. In addition, the surface roughness (Ra) of the outer surface of the coating layer 20 is preferably 10 or less. This is because if the outer surface of the coating layer 20 is extremely rough, manufacturing difficulties such as conveyance by a parts feeder occur during lamp manufacturing.

  The surface roughness of the coating layer 20 was measured using a laser microscope VK-8710 manufactured by Keyence Corporation. The measurement was performed by scanning the outer peripheral surface of the coating layer 20 from one end to the other end in a direction parallel to the central axis in the longitudinal direction of the mercury emitter 100. This measurement was performed at 4 [locations] at one end on the outer peripheral surface of the coating layer 20 and spaced at regular intervals, respectively. And the surface roughness of the coating layer 20 was calculated | required by calculating those average values.

  For example, as shown in FIG. 18, the coating layer 20 can be configured in a mesh shape. In this case, the getter material 30 can be filled in the holes 24 located between the mesh-like metal portions 22. In the configuration shown in FIG. 18, when the mercury emitter 100 is heated (particularly during high-frequency heating), mercury is released from the mercury emitting portion 10 through the hole 24 of the coating layer 20.

  As shown in FIG. 19, the coating layer 20 may have a plurality of punch holes 26. The punch hole 26 is filled with a getter material 30.

  Furthermore, as shown in FIG. 20, a tapered portion 28 may be provided at the end of the cylindrical coating layer 20. In FIGS. 20 to 23, the mercury emitting portion 10 is omitted for easy understanding of the structure of the coating layer 20.

  By providing the tapered portion 28 at the end of the mercury emitter 100, it is possible to prevent damage from colliding with other mercury emitters during transport. Further, since the end portion of the mercury emitter 100 is tapered, the mercury emitter 100 can be easily put into the glass tube when a low-pressure discharge lamp having a thin tube is manufactured. Note that only one end of the mercury emitter 100 may be tapered.

  Further, the punch holes 26 may be selectively formed in the central portion of the coating layer 20 except for the end portions, as shown in FIG. 21, without forming the punch holes 26 on the entire surface of the coating layer 20. If the punch hole 26 is formed at least in the central portion, the possibility of rupture that may occur as the mercury pressure rises inside the mercury emitter 100 can be reduced. Further, when the coating layer has a mesh shape, at least the central portion of the coating layer has a mesh shape, it is possible to reduce the possibility of rupture that may occur with an increase in mercury pressure inside the mercury emitter.

  In the example illustrated in FIG. 21, the ratio of the region L in which the punch holes 26 are not formed is, for example, 25 [%] to 75 [%] with respect to the entire length. Since the region L is close to both ends (openings) of the covering layer 20, even if the punch holes 26 are not formed in the region L, mercury can be released from the openings of the covering layer 20 located at both ends. , Can prevent rupture.

  Furthermore, the shape of the coating layer 20 is not limited to a cylinder, but may be another shape (for example, a square tube) as shown in FIG. And when the cross section of the coating layer 20 is not circular but polygonal (for example, a square cylinder and a hexagonal cylinder), the following effects can be acquired. When the coating layer 20 has a cylindrical shape, when mercury is released during heating, it is difficult for mercury to come out from the portion in contact with the glass bulb. On the other hand, when the cross section of the coating layer 20 is polygonal, the contact portion between the mercury emitter 100 and the glass bulb is always a corner portion of the coating layer 20, so that the portion where the hole 26 is opened is the glass bulb. Therefore, mercury can be released efficiently.

  In addition, when it is polygonal shape, it is more preferable that the hole is formed in the surface part. In this case, since the contact portion with the glass bulb is a corner portion of the mercury emitter, the hole formed in the surface portion is not blocked by the glass bulb, and mercury can be released more efficiently.

  Further, the punch hole 26 is not limited to a circular hole, and may have another shape. For example, the shape of the punch hole 26 may be a hexagonal shape, and the coating layer 20 having a honeycomb-shaped opening structure may be formed. Further, the punch hole 26 is not limited to a mechanically formed through hole by a punching process, but may be an opening in which a through hole is previously formed by a predetermined process. In addition, the punch hole 26 is not limited to a small hole, and as shown in FIG. 23, the punch hole 26 can be constructed by an opening that is long in the longitudinal direction. Then, the opening may be filled with a material including the getter material 30. In this case, the resistance value of the coating layer 20 can be increased. As a result, since the heating efficiency of the coating layer 20 can be increased, the mercury release efficiency can be increased.

  Further, the mercury emitting portion 10 is not limited to a cylindrical shape, and the covering layer 20 is not limited to a cylindrical shape, and may take other forms. In FIG. 24, the mercury emitting portion 10 and the coating layer 20 are laminated with each other, and the laminated body is formed into a roll shape (spiral shape). A punch hole 26 is formed in the coating layer 20. The hole 26 can be filled with the getter material 30.

  In addition, the coating layer 20 can also be constructed by a coil winding shape as shown in FIG. In the case of the coil winding shape, the gap 27 is naturally formed, and the gap 27 can be filled with the getter material 30.

  Furthermore, as shown in FIG. 26, the covering layer 20 may be composed of a primary winding coil 20D (double coil) formed by winding a coil, and the mercury discharge section 10 may be covered with the primary winding coil 20D. According to the configuration shown in FIG. 26, since the mercury emitting unit 10 is covered with the primary winding coil 20D, the mercury emitting unit 10 is compared with the configuration in which the mercury emitting unit 10 is covered with the coil shown in FIG. Can be easily heated, and the mercury emission efficiency can be further improved. And the getter material 30 can be arrange | positioned in the clearance gap formed by the coil 20D. FIG. 26 (a) is an overall configuration diagram, and FIG. 26 (b) is a partially enlarged view of FIG. 26 (a).

  In addition, as shown in FIG. 27, the coating layer 20 is composed of a secondary winding coil 20T (triple coil) formed by primary winding, and the mercury discharge part 10 may be covered with the secondary winding coil 20T. it can. In the configuration shown in FIG. 27, the mercury emitting unit 10 includes the primary winding coil 20T1 shown in FIG. 27C (that is, the primary winding coil constituting the secondary winding coil 20T2 shown in FIG. 27B). 20T1), the mercury discharge part 10 can be firmly held by the coil. As a result, it is possible to obtain an effect that the mercury alloy of the mercury emitting portion 10 can be prevented from spilling from the coil. The getter material 30 can be disposed in a gap formed by the coils 20T (T1, T2). 27 (a) is an overall configuration diagram, FIG. 27 (b) is a partially enlarged view of FIG. 27 (a), and FIG. 27 (c) is a partially enlarged view of FIG. 27 (b). FIG.

  Further, as shown in FIG. 28, the arrangement of the punch holes 26 can be made in a zigzag pattern. According to the configuration shown in FIG. 28, since the punch holes 26 are arranged in a staggered manner, the path 40 through which the eddy current during high-frequency heating flows can be zigzag, and the resistance value of the coating layer 20 can be reduced. Can be increased. As a result, since the heating efficiency of the coating layer 20 can be increased, the mercury release efficiency can be increased. If the resistance value of the coating layer 20 can be increased by zigzag the path 40 through which the eddy current flows, a suitable arrangement of the punch holes 26 can be adopted.

  Further, it can be modified as shown in FIG. In the configuration shown in FIG. 29, a cut (hole) 25 is formed by a laser. When the notch (hole) 25 is formed by laser after the mercury emitting portion 10 is packed in the coating layer 20, mercury is emitted from the surface of the mercury emitting portion 10 corresponding to the notch (hole) 25 by the heat of the laser. And the surface part will be in the state sintered selectively. As a result, it is possible to prevent the mercury alloy in the mercury emitting portion 10 from spilling out. The notch (hole) 25 is filled with the getter material 30. In addition, the shape of the notch (hole) 25 is not limited to the shape of the example shown in FIG.

  In addition, the mercury emitter 100 having the configuration shown in FIG. 30 may be used. In the mercury emitter 100 shown in FIG. 30, a flat plate-like structure in which the coating layer 20 is provided around the mercury emitting portion 10 is bent into a substantially cylindrical shape. A punch hole 26 is formed in the coating layer 20, and the getter material 30 is filled in the hole 26. In the case of the configuration shown in FIG. 30, since the end surface of the mercury alloy part 110 is covered with the coating layer 20 and the front surface and the back surface are continuous, the efficiency of eddy current can be improved.

  In the case of the configuration shown in FIG. 31, an opening 29 is formed at the center of the mercury emitting portion 10. In this example, the wall portion 21 that defines the opening 29 is provided inside the mercury emitting portion 10. It is also possible to form punch holes 26 in the wall portion 21. The hole 26 is filled with a getter material 30. FIG. 32 shows a shape in which the outer covering layer 20 has a square cross section and the inner wall 21 has a circular cross section. When the opening 29 is formed in the inside as described above, the mercury emitting portion 10 is sandwiched between the outer coating layer 20 and the inner wall portion 21, improving the heating efficiency of the mercury emitting portion 10 and releasing mercury. There is an effect that the efficiency can be improved. The inner wall portion 21 is more preferably inscribed in the outer coating layer 20. In this case, even if the mercury emitting portion 10 is fragile, there is an effect that the mercury emitting portion 10 can be held by the inner wall portion 21 and the outer coating layer 20.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to introduce | transduce mercury into a glass tube, the mercury emitter which can fully remove the impure gas in a glass tube can be provided.

Perspective view of conventional mercury emitter 1000 Perspective view of conventional mercury emitter 2000 The perspective view which shows the structure of the mercury discharge body 100 which concerns on embodiment of this invention. Sectional drawing which shows the structure of the mercury emitter 100 which concerns on embodiment of this invention. Partially cutaway perspective view for explaining mercury emitter 100 Partially cutaway perspective view for explaining mercury emitter 100 Partially cutaway perspective view for explaining comparative example 1000A Partially cutaway perspective view for explaining a comparative example 2000A (A) to (d) are process cross-sectional views for explaining a method of using the mercury emitter 100 Process drawing for explaining a method for manufacturing mercury emitter 100 The conceptual diagram of process AG of the manufacturing method of the low pressure discharge lamp which concerns on embodiment of this invention. The conceptual diagram of process HJ of the manufacturing method of the low pressure discharge lamp which concerns on embodiment of this invention. (A) Cross-sectional view including tube axis of low-pressure discharge lamp 400, (b) Enlarged cross-sectional view of portion A (A) Cross-sectional view including tube axis of low-pressure discharge lamp 500, (b) Enlarged cross-sectional view of portion B An exploded perspective view schematically showing the configuration of the backlight 600 The perspective view which shows the structure of the backlight 700 typically. Perspective view of liquid crystal display device 800 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 (A) Perspective view showing modified example of mercury emitter 100, (b) Partial enlarged view (A) Perspective view showing modified example of mercury emitter 100, (b) Partial enlarged view, (c) Partial enlarged view A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100 A perspective view showing a modified example of the mercury emitter 100

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mercury emission part 20 Cover layer 21 Wall part 22 Metal part 24 Hole 26 Punch hole 27 Gap 29 Opening part 30 Getter material 32 Impurity 100 Mercury emission body 1000A Comparative example 101 Mercury alloy part 110 Mercury alloy part 120 Container 130 Slit 1000 Mercury emission Body 2000 Mercury emitter 210 Glass tube 220 Filled gas component 240 Mercury 250 High frequency heater 260 Electric furnace 300 Glass tube 400 Low pressure discharge lamp 500 Low pressure discharge lamp 600 Backlight unit 700 Backlight unit 800 Liquid crystal display device

Claims (10)

A mercury discharge part composed of mercury and a mercury alloy of a first metal capable of forming an alloy with mercury; and
A coating layer covering the mercury discharge part,
A mercury emitter, wherein the coating layer contains a getter material.   The getter material is made of at least one material selected from the group consisting of tantalum (Ta), niobium (Nb), zirconium (Zr), chromium (Cr), titanium (Ti), and hafnium (Hf). The mercury emitter according to 1. The first metal is at least one metal selected from the group consisting of titanium (Ti), tin (Sn), zinc (Zn), and magnesium (Mg),
The mercury emitting body according to claim 1 or 2, wherein the coating layer is made of a material containing at least one second metal selected from the group consisting of iron (Fe) and nickel (Ni).   The mercury emitting body according to claim 1, wherein the coating layer contains a magnetic material. The mercury emission part is cylindrical,
The mercury emitter according to claim 1 or 2, wherein the coating layer has a cylindrical shape. The first metal is titanium (Ti),
The mercury emitter according to any one of claims 1 to 3, wherein the second metal is iron (Fe).   A method for manufacturing a discharge lamp, comprising: a step of inserting the mercury emitter according to any one of claims 1 to 6 into a glass tube; and a step of heating the mercury emitter. A discharge lamp comprising a glass tube and a phosphor layer formed on the inner wall of the glass tube,
A discharge lamp, wherein the mercury emitter according to any one of claims 1 to 6 is disposed in a part of the glass tube.   An illumination device comprising the discharge lamp according to claim 8.   A liquid crystal display device comprising the illumination device according to claim 9.