WO2009098860A1 - Mercury emitter, method for manufacturing low-pressure discharge lamp using the mercury emitter, low-pressure discharge lamp, lighting system, and liquid crystal display device - Google Patents

Abstract

Disclosed is a mercury emitter that can enhance a mercury emission efficiency and can prevent the breakage of a glass tube when the mercury emitter is used in the manufacture of a low-pressure discharge lamp. Also disclosed is a method for manufacturing a low-pressure discharge lamp which can prevent the breakage of a glass tube and can reduce the necessary amount of mercury used. Further disclosed are a low-pressure discharge lamp, which can reduce the necessary amount of mercury used, a lighting system, and a liquid crystal display device. A mercury emitter (100) comprises a mercury emitting part (101) containing an intermetallic compound between titanium (Ti) and mercury (Hg). The intermetallic compound contains Ti1.73Hg.

Description

Mercury emitter, low-pressure discharge lamp manufacturing method using the same, low-pressure discharge lamp, illumination device, and liquid crystal display device

The present invention relates to a mercury emitter, a method for producing a low-pressure discharge lamp using the same, a low-pressure discharge lamp, an illumination device, and a liquid crystal display device.

In order to enclose mercury in a glass tube for a low-pressure discharge lamp such as a cold cathode fluorescent lamp for backlight (hereinafter also simply referred to as “glass tube”), a mercury emitter containing mercury is used. ing. That is, after this mercury emitter is placed in a glass tube that serves as an arc tube, it is heated from the outside so that mercury is released by the heat.

In the process before mercury emission, the temperature of the mercury emitter may be about 400 [° C.]. As a mercury emitter that is stable up to this temperature (a mercury emitter that hardly releases mercury up to this temperature), for example, titanium (Ti ) Sintered body and mercury (Hg) are used to form Ti ₃ Hg (see, for example, Patent Document 1).
Japanese Patent No. 2965824

However, in the case of conventional mercury emitters, the mercury emission efficiency is still insufficient from a practical viewpoint.

Also, in the manufacturing process of the low-pressure discharge lamp, when mercury is released from the mercury emitter, the heating temperature is preferably set to 400 [° C.] to 800 [° C.]. This is because when mercury is released at a temperature lower than 400 [° C.], the working environment is deteriorated due to mercury being released by heating during exhaust of the low-pressure discharge lamp, while higher than 800 [° C.]. This is because, when released at a temperature, the portion of the glass tube in contact with the mercury emitter is melted by the heat of the mercury emitter itself and may be damaged.

In the case of a mercury emitter made of Ti ₃ Hg, mercury is gradually released from around 400 [° C.], but a large amount of mercury still remains in the mercury emitter around 800 [° C.]. It becomes. In this case, in order to release the mercury remaining in the mercury-emitting body, it is necessary to continue heating for a longer time and at a high temperature (about 800 [° C.]), and the heat causes a load on the glass tube. There is a risk of damage.

In addition, when a mercury emitter having a low mercury emission efficiency is used as described above, the mercury emitter needs to contain more mercury than is necessary for lighting the low-pressure discharge lamp. However, since mercury is a harmful substance, it is not environmentally preferable to use excessive mercury.

In addition to Ti ₃ Hg, TiHg, Ti _x Hg as described in page 1352 of Binary Alloy Phase Diagram (First Printing, October 1986) issued by AMERICA SOCIETY FOR METALS as well as Ti ₃ Hg. (X is 1.73 at room temperature).

However, although TiHg has excellent mercury release efficiency at temperatures higher than 400 [° C.], it has the property that Ti and Hg decompose at room temperature, so it releases mercury before the mercury release process. It was found that it is not suitable for manufacturing lamps.

In addition, the release characteristics of mercury have not been clarified for Ti _x Hg, and even the production conditions thereof have been unknown.

Therefore, the mercury emitter according to the present invention aims to improve mercury emission efficiency and prevent breakage of the glass tube when used in the manufacture of a low-pressure discharge lamp.

Also, the low-pressure discharge lamp manufacturing method according to the present invention aims to prevent breakage of the glass tube and reduce the amount of mercury used.

Further, the low-pressure discharge lamp, the illumination device, and the liquid crystal display device according to the present invention aim to reduce the amount of mercury used.

In order to solve the above-described problems, a mercury emitter according to the present invention has a mercury emitting portion containing an intermetallic compound of titanium (Ti) and mercury (Hg), and the intermetallic compound is Ti _1.73 Hg. It is characterized by including.

Further, in the mercury emitter according to the present invention, the intermetallic compound has the amount of mercury in the range of 40 wt% to 100 wt% with respect to the total mercury amount of the mercury emitting portion. It preferably contains _1.73 Hg.

In the mercury emitter according to the present invention, it is preferable that the balance of the intermetallic compound except Ti _1.73 Hg is Ti ₃ Hg.

Further, in the mercury emitter according to the present invention, it is preferable that the mercury emitting part is stored in a container having an opening part at least in part.

In the mercury emitter according to the present invention, the container is preferably formed of at least one of iron and nickel.

Further, the mercury emitter according to the present invention preferably includes a sintered body portion composed of the mercury releasing material and a metal sintered body covering the mercury releasing material.

Further, in the mercury emitter according to the present invention, the sintered body portion is preferably formed in a porous shape.

Furthermore, in the mercury emitter according to the present invention, the sintered body portion preferably has a porosity of 5% or more.

The method for manufacturing a low-pressure 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 low-pressure discharge lamp according to the present invention includes a glass tube, a lead wire sealed at at least one end portion of the glass tube, and an electrode attached to an end portion of the lead wire located inside the glass tube. The mercury emitter according to claim 1 is fixed to a portion of the lead wire located in the glass tube or the electrode.

An illumination device according to the present invention includes the low-pressure discharge lamp.

A liquid crystal display device according to the present invention includes the illumination device.

The mercury emitter according to the present invention can improve mercury emission efficiency and prevent breakage of the glass tube when used in the manufacture of a low-pressure discharge lamp. In addition, the low-pressure discharge lamp manufacturing method according to the present invention can prevent breakage of the glass tube and reduce the amount of mercury used. Furthermore, the low-pressure discharge lamp, the lighting device, and the liquid crystal display device according to the present invention can reduce the amount of mercury used.

The perspective view of the mercury discharge body which concerns on the 1st Embodiment of this invention (A) Front view showing the particle structure of the mercury emitter, (b) Plan view showing the particle structure of the mercury emitter, and (c) Cross section including the central axis in the longitudinal direction showing the particle structure of the mercury emitter. Photo A conceptual diagram of mercury emission from the same mercury emitter Graph showing measurement results by X-ray analysis of mercury emission part of mercury emitter (A) Front view showing the particle structure of the mercury emitter when the particle shape of the metal not forming an alloy with mercury is spherical, (b) Plan view showing the particle structure of the mercury emitter Diagram showing the relationship between reaction time and intermetallic compound formation rate Diagram showing change in mercury release rate with heating temperature Manufacturing process diagram of mercury emitter according to the first embodiment of the present invention The perspective view of the mercury discharge body which concerns on the 2nd Embodiment of this invention Similarly perspective view of Modification 1 of the mercury emitter The perspective view of the mercury emitter which concerns on the 3rd Embodiment of this invention Conceptual diagram of steps A to G of the method for manufacturing a low-pressure discharge lamp according to the fourth embodiment of the present invention. Conceptual diagram of steps H to J of the method for manufacturing a low-pressure discharge lamp according to the fourth embodiment of the present invention. (A) Sectional drawing including the tube axis of the low-pressure discharge lamp concerning the 5th Embodiment of this invention, (b) The expanded sectional view of A part (A) Sectional drawing including the tube axis of the low-pressure discharge lamp concerning the 6th Embodiment of this invention, (b) The expanded sectional view of the B section The perspective view of the illuminating device which concerns on the 7th Embodiment of this invention. The perspective view of the illuminating device which concerns on the 8th Embodiment of this invention. (A) Front view of lighting apparatus according to ninth embodiment of the present invention, (b) Cross-sectional view taken along line AA 'in FIG. 18 (a) The perspective view of the liquid crystal display device which concerns on the 10th Embodiment of this invention. The perspective view of the modification 1 of the mercury discharge body which concerns on the 1st Embodiment of this invention (A) Front view of modified example 1 of the mercury emitter, and (b) Plan view of modified example 1 of the mercury emitter. The perspective view of the modification 2 of the mercury emitter which concerns on the 1st Embodiment of this invention (A) Front view of modified example 2 of the mercury emitter, and (b) Plan view of modified example 2 of the mercury emitter. The perspective view of the modification 3 of the mercury emitter which concerns on the 1st Embodiment of this invention The perspective view of the modification 3 of the mercury emitter which concerns on the 1st Embodiment of this invention The perspective view of the modification 3 of the mercury emitter which concerns on the 1st Embodiment of this invention The perspective view of the modification 4 of the mercury emitter which concerns on the 1st Embodiment of this invention The perspective view of the modification 5 of the mercury emitter which concerns on the 1st Embodiment of this invention The partially cutaway perspective view of Modification 6 of the mercury emitter according to the first embodiment of the present invention

Explanation of symbols

100, 104, 106, 110, 113, 114, 115, 116, 118, 200, 203, 300, 501 Mercury emitter 101, 107, 111, 119 Mercury emitter 102, 105, 112, 117, 120 Sintered body Part 201, 206 Opening part 202, 204 Container 205 Slit 400 Glass tube 500, 600 Low pressure discharge lamp 502, 601 Light emitting tube 503, 603 Electrode 504, 604 Lead wire 700, 800, 900 Illuminating device 1000 Liquid crystal display device

(First embodiment)
The mercury emitter according to the first embodiment of the present invention will be described below.

FIG. 1 is a perspective view of the mercury emitter according to the first embodiment of the present invention, FIG. 2A is a front view showing its particle structure, FIG. 2B is a plan view thereof, and FIG. Cross-sectional photographs including the central axis are shown in FIG.

The mercury emitter 100 according to the first embodiment of the present invention (hereinafter referred to as “mercury emitter 100”) includes an intermetallic compound Ti _1.73 Hg of titanium (Ti) and mercury (Hg).

Specifically, the mercury emitter 100 includes a mercury emitter 101 and a sintered body portion 102 made of a metal sintered body covering the mercury emitter 101.

In this mercury emitting body 100, since the sintered body portion 102 covers the mercury emitting portion 101, the mercury emitting portion 101 is heated during heating (particularly during high frequency heating) as shown in FIG. Mercury can be released not only from both exposed end faces but also from almost the entire surface through a porous sintered body 102 described later (see arrow 103). As a result, the surface of the mercury emitting portion is made of a metal plate or the like. It is possible to improve the mercury emission efficiency as compared with the case where it is covered, and even when heated at a stroke, it is possible to prevent the mercury emission part 101 from suddenly expanding and bursting due to vaporized mercury. it can. Further, since the mercury emitting portion 101 and the sintered body portion 102 react at the interface, the adhesion strength between the mercury emitting portion 101 and the sintered body portion 102 is high, and the mercury emitting portion 101 spills from the mercury emitting body 100. Can be prevented.

Mercury emitting part 101 is formed of an alloy of titanium and mercury, contains an intermetallic compound of titanium and mercury, and contains Ti _1.73 Hg as an intermetallic compound. The term “alloy” as used herein includes at least “intermetallic compounds” and also includes “mixtures”, “solid solutions”, and the like.

According to Binary Alloy Phase Diagram (First Printing, October 1986), the composition ratio of titanium and mercury in the intermetallic compound Ti _1.73 Hg is about 1.73 at room temperature, but it is 1.09 or more depending on various conditions such as temperature. It can take a value within the range of 1.73 or less.

FIG. 4 shows a graph showing measurement results by X-ray analysis of the mercury emission part of the mercury emitter 100. It can be seen that the mercury emitter 100 contains Ti _1.73 Hg and Ti ₃ Hg as intermetallic compounds.

In addition, the specific method of the intermetallic compound in this invention from a mercury emitter is mentioned later. For example, the mercury emitting portion 101 has a cylindrical shape with a length L of 3 [mm] and an outer diameter Di of 1 [mm], and the mercury content is about 6 [mg].

Further, the mercury emitting portion 101 includes ceramics that is a sintered body of one or more metal oxides of titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and silicon oxide (SiO ₂ ). It may be.

Since these metal oxides do not react with mercury, the size of the mercury discharge portion 101 remains constant, and when it is desired to reduce the mercury content, the density of the reduced mercury content is replenished, Compared with the case where the mercury content is simply reduced, the thermal conductivity of the mercury emitting portion 101 can be increased, and the heating efficiency of the mercury emitting portion 101 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 emission part. In this case, when it is desired to reduce the mercury content, the density of the reduced mercury content is appropriately supplemented, and the thermal conductivity of the mercury emitting portion 101 is made to be higher than when the mercury content is simply reduced. The heating efficiency of the mercury discharge part 101 can be increased.

The sintered body portion 102 is made of a metal sintered body that does not form an alloy with mercury, and has a porous shape. “Metal that does not form an alloy with mercury” means, for example, an alloy that hardly reacts with mercury, such as at least one of iron (Fe), nickel (Ni), cobalt (Co), and manganese (Mn). It is a metal that is difficult to do. Among these, considering chemical properties and industrial productivity (cost and the like), at least one of iron (Fe) and nickel (Ni) is preferable.

In addition, the metal which comprises the sintered compact part 102 is not restricted to only one kind of metal only of iron or nickel, For example, it is also possible to use the mixture of iron and nickel, or the iron plated with nickel Can also be used. A metal obtained by applying nickel plating to iron can have an effect of preventing oxidation (corrosion prevention) of iron.

Moreover, when using what mixed nickel powder with iron powder in shaping | molding the sintered compact part 102, while being able to improve corrosion resistance rather than the case of only iron powder, by blending of iron powder and nickel powder, Variations in particle size can be expanded. If the variation of the particle diameter can be widened, it becomes easy to control the porosity (and consequently the thermal conductivity) of the sintered body portion 102 (details of the porosity will be described later).

Also, the fluidity of the blended powder of iron powder and nickel powder can be improved, and the productivity at the time of molding can be improved. In addition, since nickel has a lower specific heat than iron and a higher thermal conductivity, it is possible to improve the heating efficiency of the sintered body 102. The sintered body 102 has, for example, a length L of 3 [mm] and an outer diameter Do of 1.4 [mm].

The porosity of the sintered body portion 102 having a porous shape is preferably 5% or more. In this case, mercury can easily pass through the sintered body portion 102, and the mercury emission efficiency can be increased.

In particular, the porosity of the sintered body portion 102 is more preferably 25 [%] or more. In this case, the mercury emitted from the mercury emitting portion 101 can easily pass through the sintered body portion 102, and the mercury releasing efficiency can be further increased.

In addition, it is preferable that the porosity of the sintered compact part 102 is 60 [%] or less. If the ratio is larger than 60%, the sintered body portion 102 becomes full of pores. For example, when the mercury emitter 100 is heated at a high frequency, the heating efficiency of the mercury emitter 101 is lowered and uneven heating occurs. This is because the amount of mercury released tends to vary.

The porosity of the sintered body portion 102 is calculated by the following mathematical formula.

The density of the sintered body 102 is determined by dissolving the mercury emitter 100 in a mixed solution of hydrofluoric acid and nitric acid, and then quantitatively analyzing it with an ICP emission analyzer (ICPS-8000) manufactured by Shimadzu Corporation. It can be obtained by obtaining the weight of the bonded part 102 and dividing by the volume of the sintered part 102. Here, since the sintered body portion 102 is porous and it is difficult to determine the exact volume thereof, the volume of the sintered body portion 102 is the volume when there is no void in the sintered body portion 102. Will be used. Further, the theoretical density of the sintered body portion 102 is an imaginary density obtained on the assumption that the sintered body portion 102 has no voids.

In addition, it is preferable that the metal which comprises the sintered compact part 102 is a magnetic body. For example, it is possible to accurately and easily position the mercury emitter 100 disposed in a glass tube sealed at the time of manufacturing a low-pressure discharge lamp using a magnet. For example, iron (Fe), nickel (Ni), cobalt (Co), or the like can be selected as the metal that is a magnetic substance.

Further, a getter material may be mixed in the sintered body portion 102. By mixing the getter material, an impurity gas such as hydrogen (H ₂ ) or oxygen (O ₂ ) can be adsorbed, thereby improving the purity of the sealed gas in the glass tube. As the getter material, for example, tantalum (Ta), niobium (Nb), zirconium (Zr), chromium (Cr), hafnium (Hf), aluminum (Al), or an alloy thereof can be applied.

Also, the ratio of the surface area of the portion in contact with the sintered body portion 102 out of the total surface area of the mercury emitting portion 101 is preferably 30% or more. In this case, it is possible to obtain a very high mercury emission efficiency by increasing the heating efficiency by increasing the thermal conductivity with respect to the mercury emission part 101.

In particular, in order to further increase the heating efficiency, it is more preferable that the ratio of the surface area of the portion in contact with the sintered body portion 102 of the total surface area of the mercury discharge portion 101 is 50% or more. The “surface area of the portion in contact with the sintered body portion 102” is calculated from the contour of the outermost surface, not including the surface area of the porous internal voids, because the sintered body portion 102 is porous. Surface area.

Further, the particle size of the metal that does not form an alloy with mercury in the sintered body portion 102 is preferably in the range of 5 [μm] to 40 [μm]. In this case, it is easy to permeate mercury emitted from the mercury emitting portion 101, and the mercury emission efficiency can be improved.

Note that the particle shape of the sintered body portion 102 shown in FIGS. 2A to 2C is a scaly shape, but it is not necessarily a scaly shape and may be a polygonal shape or the like. However, in the case of a scale shape, the porosity of the sintered body portion 102 can be increased, and the mercury release efficiency can be further improved.

Further, the particle shape of the metal that does not form an alloy with mercury in the sintered body portion 102 may be a spherical shape. FIG. 5A is a front view showing the particle structure of the mercury emitter 100 when the particle shape of the metal that does not form an alloy with mercury in the sintered body portion 102 is spherical, and FIG. ) Respectively. In this case, the fluidity is improved, and in the extrusion process for forming the mercury emitter 100 as described later, it can be extruded from the molding machine with a high yield, and the productivity can be improved.

Further, the shape of the sintered body portion 102 is preferably a cylindrical shape that covers the outer peripheral surface excluding the end face of the mercury emitting portion 101, as shown in FIGS. 5 (a) and 5 (b). In this case, the eddy current generated by the high frequency heating flows to the inner surface closed in a cylindrical shape, and the heating efficiency of the mercury discharge part 101 can be increased.

(Experiment 1)
The inventors considered that Ti _1.73 Hg has an intermediate composition between Ti ₃ Hg and TiHg because it has an intermediate composition between Ti ₃ Hg and TiHg. However, from the phase diagram of titanium and mercury described on page 1352 of Binary Alloy Phase Diagram (First Printing, October 1986) issued by AMERICA SOCIETY FOR METALS, the conditions for stable formation of Ti _1.73 Hg can be determined. There wasn't.

Therefore, the inventors changed the number of sintered bodies to be added to the heating container and the amount of mercury to react, thereby causing a reaction time at a constant temperature shown in FIG. 6 (time for titanium and mercury to react), We succeeded in clarifying the relationship between the mercury content of each intermetallic compound and the total mercury content in the mercury emission part.

In FIG. 6, the solid line represents Ti _1.73 Hg, the broken line represents TiHg, and the alternate long and short dash line represents Ti ₃ Hg. In addition, the composition ratio was calculated | required by the method mentioned later. In the experiment, Ti _1.73 Hg, generation of TiHg and Ti ₃ Hg (reaction) at the start and generation (reaction) but could not be identified at the end, Ti _1.73 Hg, 3's TiHg and Ti ₃ Hg The tendency that is generated is as shown in FIG.

As shown in FIG. 6, as the reaction time increases until the reaction time reaches a predetermined time, the production of Ti _1.73 Hg increases while the production of TiHg decreases. When the reaction time exceeds a predetermined time, the production of Ti _1.73 Hg decreases and the production of Ti ₃ Hg increases as the reaction time increases.

This tendency can be seen whether the reaction progresses earlier or later. In other words, for example, the time from the reaction start time to the reaction time at which the line segment indicating the generation of Ti _1.73 Hg and the line segment indicating the generation of Ti ₃ Hg intersect becomes longer or shorter. The line segment indicating the generation of Ti _1.73 Hg has a mountain shape. The reaction between titanium and mercury in the sintered body changes depending on the reaction temperature, the amount of titanium put into the heating container (surface area of titanium), the amount of mercury put into the heating container, and delays the progress of the reaction. _1.73 Hg production can be confirmed. For example, when the reaction temperature is lowered, the progress of the reaction is slow (that is, the graph of FIG. 6 is expanded in the horizontal axis direction), and the production of Ti _1.73 Hg is easily confirmed. On the other hand, if the reaction temperature is increased, the production of Ti ₃ Hg is accelerated, so that it is difficult to confirm the production of Ti _1.73 Hg.

That is, the inventors found from the results of Experiment 1 that the mercury emitter 100 was produced by controlling the progress of the reaction between titanium and mercury.

(Experiment 2)
Next, the inventors conducted an experiment to measure the mercury emission amount in order to confirm that the mercury emission body 100 has improved mercury emission efficiency over the conventional mercury emission body.

In the experiment, as an example, the mercury discharge part has a diameter of 1 [mm], the sintered body part has an outer diameter of 1.4 [mm], a length of 3 [mm], and 6 [mg] of mercury. The contained mercury emitter 100 was used. Specifically, the example in which the intermetallic compound contains Ti _1.73 Hg having a mercury amount of 20 [wt%] with respect to the mercury amount in the mercury emitting portion is set as Example 1, and the mercury amount in the mercury emitting portion is also the same. Te 40 and example 2 shall include Ti _1.73 Hg with a mercury content of [wt%], also contains Ti _1.73 Hg with a mercury content of 60 [wt%] with respect to the mercury content of mercury-emitting portion Example 3 was used, and Example 4 was also used in which Ti _1.73 Hg having a mercury amount of 90 wt% with respect to the mercury amount in the mercury emission part was included.

Further, as a comparative example, the same size as in Examples 1 to 4 containing the same amount of mercury, an intermetallic compound formed of Ti ₃ Hg, and no Ti _1.73 Hg was used. In addition, the Example and the comparative example were produced by changing the temperature while the reaction time of mercury was constant.

The ratio of Ti _1.73 Hg in the intermetallic compound contained in the mercury emission part was specified by the following method.
(1) Immerse the mercury emitter in aqua regia. Thereby, Ti _1.73 Hg and Ti ₃ Hg, which are intermetallic compounds, of the mercury emitters dissolve into the aqua regia. At this time, if single titanium (Ti) remains in the mercury emitter, it remains as a residue.
(2) determine the ratio of titanium and mercury in the intermetallic compound by quantifying by Shimadzu Corporation in an ICP emission spectrometer the amount of melted titanium and mercury aqua regia (ICPS-8000), Ti _1.73 From the ratio calculation of Hg and Ti ₃ Hg, the ratio of Ti _1.73 Hg in the metal compound was specified.

In addition, when there is a possibility that the mercury emitting body contains simple substance Hg and TiHg, the substance is soaked in nitric acid before being immersed in aqua regia, and the simple substance Hg and TiHg are dissolved for quantification. At this time, Ti _1.73 Hg and Ti ₃ Hg do not dissolve in nitric acid.

In the experiment, 10 samples were prepared for each. In the experiment, each sample was heated one by one at the same heating rate, and the mercury release amount (reduction in the weight of the mercury emitter) was measured in an oxygen-free atmosphere with a thermobalance analyzer (TG8101D) manufactured by Rigaku Corporation. The mercury release efficiency with respect to the mercury content (6 [mg]) was calculated, and an average value of 10 [pieces] was obtained for each sample. FIG. 7 shows changes in the mercury release rate depending on the heating temperature of each sample.

As shown in FIG. 7, in all mercury emitters, the heating temperature exceeds 400 [° C.] and mercury starts to be released around 500 [° C.], but the mercury emission rate at the heating temperature of 800 [° C.] is large. The result was different.

That is, when the intermetallic compound contains Ti _1.73 Hg (Examples 1 to 4 in the figure), mercury emission formed with conventional Ti ₃ Hg at a heating temperature of 800 ° C. It can be confirmed that the mercury emission efficiency is improved as compared with the body (comparative example in the figure). It can also be confirmed that the mercury emission efficiency of the mercury emitter improves as the proportion of Ti _1.73 Hg in the intermetallic compound increases. That is, when Ti _1.73 Hg is contained in the intermetallic compound present in the mercury emitting part, the mercury releasing efficiency can be improved as compared with the conventional mercury emitting body.

Further, the intermetallic compound contains Ti _1.73 Hg having a mercury amount in the range of 40 wt% to 100 wt% with respect to the mercury amount in the mercury emitting portion (Examples 2 to 4 in the figure). 4). In this case, at a heating temperature of 800 [° C.], about 6 [times] of mercury can be released compared to a conventional mercury emitter.

Furthermore, Ti _1.73 Hg having a mercury amount in the range of 60 [wt%] or more and 100 [wt%] or less with respect to the mercury amount in the mercury emitting portion is included (Examples 3 and 4 in the figure). Is more preferable. In this case, mercury of 50% or more of the mercury content can be released at 800 [° C.].

Note that it is difficult to manufacture all the intermetallic compounds with Ti _1.73 Hg. As shown in FIG. 6, this is the relationship between TiHg decreasing with time and increasing Ti ₃ Hg in the production process of the intermetallic compound, and it is difficult to reduce the production of these TiHg and Ti ₃ Hg to 0%. This is because. Therefore, it is more preferable that the intermetallic compound contains Ti _1.73 Hg having a mercury amount in the range of 90 [wt%] or less with respect to the mercury amount in the mercury emitting part, but all of the intermetallic compound is Ti _1.73 Hg. Needless to say, it is preferable to include Ti _1.73 Hg having a mercury amount in the range of 100 wt% or less with respect to the mercury amount in the mercury emitting portion.

Moreover, it is preferable that the remainder of the intermetallic compound except Ti _1.73 Hg is Ti ₃ Hg.

In this case, the intermetallic compound contains Ti ₃ Hg, and generation of TiHg that decomposes at room temperature can be substantially suppressed (to the extent that it cannot be measured), and mercury can be produced at a low temperature such as 100 ° C. It can be prevented from being released (this can also be inferred from the fact that the intermetallic compound of the comparative example of FIG. 7 is made of Ti ₃ Hg).

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

As shown in FIG. 8, first, raw material powder is prepared. Specifically, for example, titanium powder, which is a material of the mercury emitting portion 101, or iron powder, which is a material of the sintered body portion 102, is used.

(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, titanium clay and iron clay are produced.

(Extrusion process)
Next, the titanium clay and the iron clay are put into first and second extrusion molding machines (not shown), respectively. This second extrusion 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 the die portion of the second extrusion molding machine, and a cylindrical body having a coaxial structure in which iron clay 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, a method of forming a titanium clay into 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. The mercury content in the mercury emitter 100 can be adjusted to a desired amount by the length to be cut. In addition to this, the mercury content of the mercury emitter 100 can be adjusted by changing the binder amount of the titanium clay, the outer diameter of the mercury emitting 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 reaction process)
Thereafter, 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 example, 4 [h] to 16 [ h] About a degree of heating, titanium constituting the sintered body and mercury in the heating container are alloyed to form the mercury discharge portion 101. At this time, Ti _1.73 Hg is generated in the mercury emitting portion 101.

And since iron does not form an alloy with mercury, no mercury remains in the sintered iron, and an alloy of titanium and mercury (the “intermetallic compound” of the present invention) is formed in the sintered titanium. As a result, the mercury emitter 100 is completed.

As described above, according to the configuration of the mercury emitter 100 according to the first embodiment of the present invention, it is necessary to continue heating at a high temperature for a long time in order to improve mercury emission efficiency and sufficiently release mercury. Therefore, the glass tube can be prevented from being damaged when used in the manufacture of a low-pressure discharge lamp.

(Second Embodiment)
A mercury emitter according to the second embodiment of the present invention will be described below. FIG. 9 shows a perspective view of a mercury emitter according to the second embodiment of the present invention.

In the mercury emitter 100 according to the first embodiment, the mercury emitter 101 is covered with the sintered metal portion 102 of the metal, but the mercury emitter 200 according to the second embodiment of the present invention (hereinafter referred to as the following). The “mercury emitter 200” is substantially the same as the first embodiment of the present invention except that the mercury emitting part is housed inside a container 202 having an opening 201 at least partially. It has a configuration.

The container 202 has a cylindrical shape made of, for example, iron and has an outer diameter of 1.4 [mm], an inner diameter of 1 [mm], and a height of 3 [mm]. Since the container 202 is cylindrical, it has the opening part 201 in the both ends. When the mercury emitter 200 is heated, mercury can be emitted from the mercury emitter 101 through the opening 201.

The material of the container 202 is not limited to iron but is preferably a magnetic material. In this case, when the mercury emitter 200 is used for manufacturing a discharge lamp, after the mercury emitter is inserted into the glass tube, the arrangement position of the mercury emitter 200 can be adjusted by a magnetic force.

As the metal that is a magnetic substance, for example, iron (Fe), nickel (Ni), cobalt (Co), or the like can be selected. Among these, considering chemical properties and industrial productivity (cost and the like), at least one of iron (Fe) and nickel (Ni) is preferable.

In addition, the metal which comprises the container 202 is not restricted to one kind of metal only of iron or nickel, For example, it is also possible to use the mixture of iron and nickel, or to use nickel-plated iron. You can also. A metal obtained by applying nickel plating to iron can have an effect of preventing oxidation (corrosion prevention) of iron.

The shape of the container 202 is not limited to a cylindrical shape, and may be a polyhedral shape such as a trapezoidal cylinder as shown in FIG. In this case, when the mercury emitter 203 is used for manufacturing a low-pressure discharge lamp, the contact area with the glass tube can be reduced when the mercury emitter 203 is inserted into the glass tube. Can be prevented from being damaged.

Further, as shown in FIG. 10, a slit 205 may be provided on the side surface of the container 204. In this case, mercury can be discharged from the mercury discharge portion 101 inside the container via the slit 205, so that the mercury discharge efficiency can be improved. The opening of the container in this case includes not only the opening 206 at both ends of the container but also the slit 205.

Next, a method for manufacturing the mercury emitter 200 according to the second embodiment of the present invention will be described.

(Mercury alloy powder production process)
First, raw material powder is prepared. Specifically, a mercury alloy powder (for example, an alloy powder of titanium and mercury) that serves as a material for the mercury emitting portion 101 is prepared.

(Molding process)
Next, the mercury discharge part 101 is shape | molded by compression molding etc. from the alloy powder, and the cylindrical mercury discharge part 101 is produced in this embodiment.

(Container insertion process)
Thereafter, the mercury discharge part 101 is disposed in the containers 202 and 204. Specifically, the containers 202 and 204 are formed by winding a plate material made of iron (Fe) or nickel (Ni) around the cylindrical mercury discharge portion 101, and at the same time, the mercury discharge portion 101 is arranged in the container. As a result, the mercury emitters 200 and 203 can be produced.

It is also possible to produce the mercury emitter 200 by inserting the mercury discharge part 101 into the container 202 formed into a cylindrical shape (for example, a cylindrical shape).

As described above, according to the configuration of the mercury emitters 200 and 203 according to the second embodiment of the present invention, by changing the amalgam component, the mercury emission efficiency is improved over the conventional one, and the mercury is sufficient. Therefore, it is not necessary to continue heating at a high temperature for a long time, so that the glass tube can be prevented from being damaged when used in the manufacture of a low-pressure discharge lamp.

(Third embodiment)
A mercury emitter according to the third embodiment of the present invention will be described below. FIG. 11 shows a perspective view of a mercury emitter according to the third embodiment of the present invention.

A mercury emitter 300 (hereinafter referred to as “mercury emitter 300”) according to the third embodiment of the present invention is configured by only the mercury emitter 101 without the sintered body 102 and the containers 202 and 204. Except for the point, it has substantially the same configuration as the mercury emitter according to the first and second embodiments of the present invention.

Mercury emitter 300 is composed of a cylindrical mercury emitter. For example, the mercury emitter 300 has a diameter of 1.4 [mm] and a length of 3 [mm].

Note that the shape of the mercury emitter 300 is not limited to a cylindrical shape. For example, a spherical shape, a polyhedron shape, or the like may be used.

Further, the mercury emitting part 101 may contain a magnetic material. In this case, when the mercury emitter 300 is used for manufacturing a low-pressure discharge lamp, after the mercury emitter 300 is inserted into the glass tube, the arrangement position of the mercury emitter 300 can be adjusted by a magnetic force. For example, iron (Fe), nickel (Ni), cobalt (Co), or the like can be selected as the metal that is a magnetic substance. Among these, considering chemical properties and industrial productivity (cost and the like), at least one of iron (Fe) and nickel (Ni) is preferable.

Next, a method for manufacturing the mercury emitter 300 according to the third embodiment of the present invention will be described. First, raw material powder is prepared. Specifically, it is, for example, titanium powder that is used as a material for the mercury emitting portion 101.

(Mixing / kneading process)
Next, a binder, various additives, and water are added to the titanium powder, mixed, and sufficiently kneaded. The binder is, for example, methyl cellulose. Thereby, a titanium clay is produced.

(Molding process)
Next, the titanium clay is put into an extrusion molding machine (not shown). And a rod-shaped titanium molded object is derived | led-out from an extrusion molding machine, and this molded object is dried until it becomes predetermined | prescribed hardness after that. The molding method is not limited to extrusion molding, and a method such as press molding can be used.

(Cut process)
Next, the molded body is cut to a predetermined length. The mercury content in the mercury emitter 300 can be adjusted to a desired amount by the cut length. In addition, the mercury content of the mercury emitter 300 can be adjusted by changing the binder amount of the titanium clay, the outer diameter of the mercury emitting portion 101, the firing temperature in the firing step, and the like.

In the molding process, the cut process may be omitted when the finished product is molded to the size of one finished product by press molding or 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 reaction process)
Thereafter, 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 example, 4 [h] to 16 [ h] Heat about to alloy titanium and mercury.

At this time, an alloy of titanium and mercury is formed in the sintered body of titanium, and the mercury emitter 300 is completed.

As described above, according to the mercury emitter 300 according to the third embodiment of the present invention, since the mercury emitter 300 contains Ti _1.73 Hg, the mercury emission efficiency is improved and the mercury is sufficiently released. However, since it is not necessary to continue heating for a long time and at a high temperature, the glass tube can be prevented from being damaged when used for manufacturing a low-pressure discharge lamp.

(Fourth embodiment)
The method for manufacturing a low-pressure discharge lamp according to the fourth embodiment of the present invention is a method for manufacturing a low-pressure discharge lamp in which the mercury emitter is taken out during the manufacturing process and the finished lamp has no mercury emitter.

A method for manufacturing a low-pressure discharge lamp according to a fourth embodiment of the present invention includes a step of inserting a mercury emitter according to the first embodiment of the present invention into a glass tube, and a step of heating the mercury emitter. Is included.

FIG. 12 shows a schematic diagram of steps A to G of the manufacturing process, and FIG. 13 shows a schematic diagram of steps H to J, respectively.

(Process A)
First, the prepared straight tubular glass tube 400 is suspended and its lower end is immersed in the phosphor suspension 402 in the tank 401. The phosphor suspension 402 contains, for example, blue, red, and green phosphor particles. By making the pressure inside the glass tube 400 negative, the phosphor suspension 402 in the tank 401 is sucked up and applied to the inner surface of the glass tube 400.

This siphoning is set so that the liquid level becomes a predetermined height of the glass tube 400 by detecting the liquid level with the optical sensor 403. The liquid level error at this time is relatively large because of the influence of the viscosity of the phosphor suspension 402, the surface tension of the liquid level, and the like, and an error of about ± 0.5 [mm] occurs.

(Process B)
Next, the negative pressure state is released to the atmospheric pressure state, and then the lower end portion of the glass tube 400 is pulled up from the phosphor suspension 402, and the excess phosphor suspension 402 inside the glass tube 400 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 400.

Subsequently, after drying the phosphor suspension 402 applied in the glass tube 400, a brush or the like 404 is inserted into the inner surface of the glass tube 400 to remove unnecessary phosphor portions at the end of the glass tube 400. .

Subsequently, the glass tube 400 is transferred into a heating furnace (not shown), and the phosphor particles adhering to the inner surface of the glass tube 400 are baked to obtain the phosphor layer 405.

(Process C)
Thereafter, the electrode unit 409 including the electrode 406, the bead glass 407, and the lead wire 408 is inserted into one end of the glass tube 400 on which the phosphor layer 405 is formed, and then temporarily fixed. Temporary fixing means that the outer peripheral portion of the glass tube 400 where the bead glass 407 is positioned is heated by the burner 410 and a part of the outer periphery of the bead glass 407 is fixed to the inner peripheral surface of the glass tube 400. Since only a part of the outer periphery of the bead glass 407 is fixed, the air permeability of the glass tube 400 in the tube axis direction is maintained. The electrode 40 is a so-called cold cathode type.

(Process D)
Next, the glass tube 400 is turned upside down, the electrode 411 having substantially the same configuration as the electrode unit 409, the bead glass 412 and the lead wire are placed on the glass tube 400 from the side opposite to the side where the electrode unit 409 is inserted. After inserting the electrode unit 414 containing 413, the outer peripheral part of the glass tube 400 in which the bead glass 412 is located is heated with the burner 415, and the glass tube 400 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 409 in the process C and the insertion of the electrode unit 414 in the process D are the lengths of the non-existing regions of the phosphor layer 405 respectively extending from both ends of the glass tube after sealing both ends of the glass tube. It is preferable that the insertion amount is adjusted so that the positions are different.

In this case, the electrode unit 414 on the other end side is inserted from the position overlapping the phosphor layer 405 to the back as compared with the electrode unit 409 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 length of the non-existing region of the phosphor layer 405 is at least 2 [mm] between the one end side and the other end side of the glass tube, the sensor is surely used. Thus, the longitudinal direction can be identified.

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 tube, the sensor can be used more reliably in the longitudinal direction. Orientation 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 part of the glass tube 400 between the electrode unit 409 and the end of the glass tube 400 closer to the electrode unit 409 is heated by the burner 416 to reduce the diameter, thereby forming a constricted portion 400a. . Thereafter, the mercury emitter 100 according to the first embodiment of the present invention is put into the glass tube 400 from the end portion and hooked on the constricted portion 400a (the mercury emitter 100 is inserted into the glass tube 400). Process).

(Process F)
Subsequently, the exhaust in the glass tube 400 and the filling of the sealed gas into the glass tube 400 are sequentially performed. Specifically, the head of the air supply / exhaust device (not shown) is attached to the end of the glass tube 400 on the mercury emitter 100 side, and first, the inside of the glass tube 400 is evacuated to a vacuum and the heating device (FIG. The entire glass tube 400 is heated from the outer periphery by not shown). As a result, the temperature of the glass tube becomes about 400 [° C.], and the impure gas in the glass tube 400 including the impure gas entering the phosphor film 405 is discharged. After the heating is stopped, a predetermined amount of sealed gas (for example, a mixed rare gas such as a mixed gas having a partial pressure ratio of argon: 95 [%], neon: 5 [%], etc.) is filled.

(Process G)
When the filling gas is filled, the end of the glass tube 400 on the mercury emitter 100 side is heated by the burner 417 and sealed.

(Process H)
Subsequently, in step H shown in FIG. 13, the mercury emitter 100 is induction-heated by a high-frequency oscillation coil (not shown) disposed around the glass tube 400 to release mercury from the mercury emitter 100 (mercury emitter). Step of heating 100). As a method for heating the mercury emitter 100, various known methods such as heating with a gas burner or light heating can be used. Thereafter, the glass tube 400 is heated in the heating furnace 418, and the released mercury is moved toward the electrode 411 of the electrode unit 414.

(Process I)
Next, the outer peripheral part of the glass tube 400 where the bead glass 407 is located is heated by a burner 419, and the glass tube 400 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 400, the end portion on the mercury emitter 100 side is cut off from the sealed portion at the one end.

This completes the low-pressure discharge lamp.

As described above, according to the configuration of the low-pressure discharge lamp manufacturing method according to the fourth embodiment of the present invention, the mercury emitter 100 described in the first embodiment is used, so that mercury is sufficiently released. However, it is not necessary to continue heating at a high temperature for a long time, and the glass tube can be prevented from being damaged when used for manufacturing a low-pressure discharge lamp.

Further, since the mercury emitter 100 having high mercury emission efficiency is used, the amount of mercury contained in the mercury emitter 100 can be reduced, in other words, the amount of mercury used for the lamp can be reduced, and the environment can be reduced. The load on can be reduced.

In the present embodiment, the case where the mercury emitter 100 according to the first embodiment of the present invention is used has been described. In addition, the mercury emitters 200 and 203 according to the second embodiment of the present invention are also described. The mercury emitter 300 according to the third embodiment of the present invention and other mercury emitters according to modifications described later can also be used.

(Fifth embodiment)
FIG. 14A is a cross-sectional view including a tube axis of a low-pressure discharge lamp 500 (hereinafter simply referred to as “lamp 500”) according to the fifth embodiment of the present invention, and FIG. ) Respectively. As shown in FIG. 14A, the lamp 500 is a cold cathode fluorescent lamp, and unlike the low-pressure discharge lamp manufactured by the low-pressure discharge lamp manufacturing method according to the fourth embodiment of the present invention, the lamp 500 is. The mercury emitter 501 remains inside.

The lamp 500 includes a glass tube 502, an electrode 503, and a lead wire 504. The glass tube 502 is a straight tube, and a cross section cut perpendicularly to the tube axis has a substantially circular shape. The glass tube 502 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 500 shown below are values corresponding to the dimensions of the glass tube 502 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 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 tube 502, mercury is sealed at a predetermined ratio, for example, 0.6 [mg / cc] with respect to the volume of the glass tube 502 (the volume in a state where the end portion is sealed), A rare gas such as argon or neon is sealed at a predetermined sealing pressure, for example, 60 [Torr].

Note that, as the rare gas, a mixed gas having a partial pressure ratio of argon and neon (Ar = 5 [%], Ne = 95 [%]) is used. It is not limited to the partial pressure ratio.

A phosphor layer 505 is formed on the inner surface of the glass tube 502. The phosphor particles used for the phosphor layer 505 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 (Y ₂ O ₃ ) may be provided between the inner surface of the glass tube 502 and the phosphor layer 505.

Furthermore, lead wires 504 are led out from both ends of the glass tube 502 to the outside. The lead wire 504 is sealed at both ends of the glass tube 502 through the bead glass 506.

The lead wire 504 is, for example, a joint consisting of an internal lead wire 504a made of tungsten and an external lead wire 504b made of nickel. The inner lead wire 504a has a wire diameter of 1 [mm] and a total length of 3 [mm], and the outer lead wire 504b has a wire diameter of 0.8 [mm] and a total length of 5 [mm].

A hollow type, for example, a bottomed cylindrical electrode 503 is fixed to the tip of the internal lead wire 504a. This fixing is performed using, for example, laser welding.

The dimensions of each part of the electrode 503 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. 14B, a mercury emitter 501 is fixed between the electrode 503 and the bead glass 506 of at least one of the internal lead wires 504a. The mercury emitter 501 is formed by forming a through hole 501a for passing an internal lead wire through the mercury emitter 100 according to the first embodiment of the present invention. Note that the mercury emitter 501 may be fixed to the electrode 503 instead of the lead wire 504.

As described above, according to the configuration of the low-pressure discharge lamp according to the fifth embodiment of the present invention, the mercury emitter 501 having good mercury emission efficiency is used, so the amount of mercury contained in the mercury emitter 501 is reduced. In other words, the amount of mercury used for one lamp can be reduced, and the burden on the environment can be reduced.

(Sixth embodiment)
FIG. 15A is a cross-sectional view including a tube axis of a low-pressure discharge lamp (hereinafter simply referred to as “lamp 600”) according to a sixth embodiment of the present invention, and FIG. Respectively. As shown in FIG. 14A, the lamp 600 is a hot cathode fluorescent lamp, and unlike the low-pressure discharge lamp manufactured by the low-pressure discharge lamp manufacturing method according to the fourth embodiment of the present invention, the lamp 600 is. The mercury emitter 501 remains inside.

The lamp 600 is a hot cathode fluorescent lamp, and includes a glass tube 601 and an electrode mount 602.

The glass tube 601 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 602 are sealed at both ends thereof.

A phosphor layer 505 is formed on the inner surface of the glass tube 601, and mercury (eg, 4 [mg] to 10 [mg]) is sealed inside the glass tube 601 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. 15A, the electrode mount 602 is a so-called bead glass mount, a tungsten filament electrode 603, a pair of lead wires 604 that support the filament electrode 603, and the pair of lead wires 604. And a bead glass 605 for fixing and supporting. The filament electrode 603 is of a so-called hot cathode type.

As shown in FIG. 15B, a mercury emitter 501 is fixed to the lead wire 604 of at least one of the electrode mounts 602. However, the through hole 501 a of the mercury emitter 501 used here is adapted to the wire diameter of the lead wire 604.

A part of the lead wire 604 is sealed to the end of the glass tube 601 in the electrode mount 602, specifically, a part extending from the bead glass 605 to the side opposite to the filament electrode 603. is there. The electrode mount 602 is sealed to the glass tube 601 by, for example, a pinch seal method.

Note that an exhaust pipe remaining portion 606 is attached together with the electrode mount 602 to at least one end of the glass tube 601. The exhaust pipe remaining portion 606 is used when exhausting the inside of the glass tube 601 after sealing the electrode mount 602 or enclosing the above-mentioned sealed gas or the like. When the sealing is completed, for example, chip-off sealing is performed at a portion located outside the glass tube 601 in the exhaust pipe remaining portion 606.

As described above, according to the configuration of the low-pressure discharge lamp 600 according to the sixth embodiment of the present invention, the mercury emitter 501 having high mercury emission efficiency is used. In other words, the amount of mercury used for one lamp can be reduced, and the load on the environment can be reduced.

(Seventh embodiment)
FIG. 16 shows an exploded perspective view of a lighting device 700 according to the seventh embodiment of the present invention. An illuminating device 700 according to a seventh embodiment of the present invention is a direct-type backlight unit, and has a rectangular parallelepiped casing 701 having one open surface and a plurality of lamps housed in the casing 701. 500, a pair of sockets 702 for electrically connecting the lamp 500 to a lighting circuit (not shown), and an optical sheet 703 covering the opening of the housing 701. The lamp 500 is a low-pressure discharge lamp 500 according to the fifth embodiment of the present invention.

The housing 701 is made of, for example, polyethylene terephthalate (PET) resin, and a reflective surface 704 is formed by depositing a metal such as silver on the inner surface thereof. Note that the material of the housing 701 may be made of a material other than resin, for example, a metal material such as aluminum or a cold rolled material (for example, SPCC).

Further, as the reflection surface 704 on the inner surface, a reflection sheet whose reflectance is increased by adding calcium carbonate, titanium dioxide, or the like to a polyethylene terephthalate (PET) resin other than a metal vapor deposition film may be attached to the housing 701. .

In addition to the socket 702, for example, an insulator 705 and a cover 706 are disposed inside the housing 701. Specifically, the sockets 702 are provided at predetermined intervals in the lateral direction (vertical direction) of the housing 701 corresponding to the arrangement of the lamps 500. The socket 702 is obtained by processing a plate made of stainless steel or phosphor bronze, for example, and has a fitting portion 702a into which the external lead wire 504b is fitted. Then, the external lead wire 504b is fitted by being elastically deformed so as to expand the fitting portion 702a. As a result, the external lead wire 504b fitted into the fitting portion 702a is pressed by the restoring force of the fitting portion 702a and is difficult to come off. Thereby, the external lead wire 504b can be easily fitted into the fitting portion 702a, but can be made difficult to come off.

The socket 702 is covered with an insulator 705 so that the sockets 702 adjacent to each other are not short-circuited. The insulator 705 is made of, for example, polyethylene terephthalate (PET) resin. Note that the insulator 705 is not limited to the above structure. Since the socket 702 is in the vicinity of the internal electrode 503 that becomes relatively hot during operation of the lamp 500, the insulator 705 is preferably made of a heat resistant material. As a material for the heat-resistant insulator 705, for example, polycarbonate (PC) resin, silicon rubber, or the like can be used.

Inside the housing 701, a lamp holder 707 may be provided at a required place. The lamp holder 707 that fixes the position of the lamp 500 inside the housing 701 is, for example, polycarbonate (PC) resin, and has a shape that follows the outer shape of the lamp 500. The “place as needed” means that the lamp 500 is bent when the lamp 500 has a long length exceeding, for example, 600 [mm], as in the vicinity of the central portion of the lamp 500 in the longitudinal direction. It is a place necessary to eliminate.

The cover 706 separates the socket 702 from the space inside the housing 701. The cover 706 is made of, for example, polycarbonate (PC) resin, keeps the periphery of the socket 702 warm, and highly reflects at least the surface on the housing 701 side. Therefore, the luminance reduction at the end of the lamp 500 can be reduced.

The opening of the housing 701 is covered with a light-transmitting optical sheet 703 and is sealed so that foreign matters such as dust and dust do not enter inside. The optical sheet 703 is formed by laminating a diffusion plate 708, a diffusion sheet 709, and a lens sheet 710.

The diffusion plate 708 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 701. The diffusion sheet 709 is made of, for example, a polyester resin. The lens sheet 710 is, for example, a laminate of an acrylic resin and a polyester resin. These optical sheets 703 are arranged so as to be sequentially superimposed on the diffusion plate 708.

As described above, according to the configuration of the lighting device 700 according to the seventh embodiment of the present invention, since the lamp with a small amount of mercury used is used, a lighting device with a small environmental load can be realized.

(Eighth embodiment)
FIG. 17 shows a partially cutaway perspective view of a lighting apparatus according to the eighth embodiment of the present invention. An illuminating device 800 according to an eighth embodiment of the present invention (hereinafter referred to as “illuminating device 800”) is an edge light type backlight unit, and includes a reflector 801, a lamp 500, a socket (not shown), and a light guide plate. 802, a diffusion sheet 803, and a prism sheet 804.

The reflection plate 801 is disposed so as to surround the surface around the light guide plate 802 except for the liquid crystal panel side (arrow Q), and the bottom surface portion 801b covering the bottom surface of the light guide plate 802 and the side where the lamp 500 is disposed. And a curved lamp side surface portion 801c covering the periphery of the lamp 500, and the light emitted from the lamp is guided from the light guide plate 802 to the liquid crystal panel (not shown) side ( Reflected in the arrow Q). Moreover, the reflecting plate 801 is made of, for example, a film-like PET deposited with silver or a laminated metal foil such as aluminum.

The socket has substantially the same configuration as the socket 702 used in the lighting device 700 according to the seventh embodiment of the present invention. In FIG. 17, the end of the lamp 500 is omitted for convenience of illustration.

The light guide plate 802 is for guiding the light reflected by the reflection plate 801 to the liquid crystal panel side. The light guide plate 802 is made of, for example, translucent plastic and has a bottom surface portion 801b of the reflection plate 801 provided on the bottom surface of the lighting device 800. Are stacked on top of each other. As a material, polycarbonate (PC) resin or cycloolefin-based resin (COP) can be applied.

The diffusion sheet 803 is for expanding the visual field and is made of, for example, a film having a diffusion transmission function made of polyethylene terephthalate resin or polyester resin, and is laminated on the light guide plate 802.

The prism sheet 804 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 803. Note that a diffusion plate may be further stacked on the prism sheet 804.

In the case of this embodiment, a reflective sheet (not shown) is provided on the outer surface of the glass tube 502 except for a part in the circumferential direction of the lamp 500 (the light guide plate 802 side when inserted into the lighting device 800). An aperture-type lamp may be used.

As described above, according to the configuration of the lighting device 800 according to the eighth embodiment of the present invention, since the lamp with a small amount of mercury used is used, it is possible to realize a lighting device with a small environmental load.

(Ninth embodiment)
FIG. 18A shows a front view of a lighting apparatus according to the ninth embodiment of the present invention, and FIG. 18B shows a cross-sectional view taken along the line AA ′ of FIG. 18A. An illuminating device 900 (hereinafter referred to as “illuminating device 900”) according to a ninth embodiment of the present invention is a luminaire using an annular fluorescent lamp for general illumination.

The lighting device 900 includes a main body portion 901, a plate-like portion 902, a lamp holder 903, a socket 904, and a lamp 905.

The main body 901 accommodates a lighting circuit (not shown) and the like inside, for example, and an electrical connection part (not shown) is led out from the upper part, for example, the base 906 of the lamp 905 and the electric part from the side part. A socket 904 for connection is provided.

The disc-shaped portion 902 is a member that supports the main body portion 901 and the lamp holder 903, and has, for example, a disc-like shape.

The lamp holder 903 is attached to the lower surface of the plate-like portion 902, and the lamp 905 can be held by, for example, a C-shaped sandwiching piece provided at the lower end thereof to prevent the lamp 905 from dropping.

The lamp 905 is an annular hot-cathode fluorescent lamp, and the low-pressure discharge lamp 600 according to the sixth embodiment is the same as the low-pressure discharge lamp 600 according to the sixth embodiment except that the shape is annular and the base 906 is located in the middle of the lamp 905. It has substantially the same configuration.

As described above, according to the configuration of the lighting device 900 according to the ninth embodiment of the present invention, since the lamp with a small amount of mercury used is used, a lighting device with a small environmental load can be realized.

(Tenth embodiment)
FIG. 19 shows an outline of a liquid crystal display device according to the tenth embodiment of the present invention. As shown in FIG. 19, the liquid crystal display device 1000 is, for example, a 32 [inch] television, and includes a liquid crystal screen unit 1001 including a liquid crystal panel and the like, an illumination device 700 according to the seventh embodiment of the present invention, and a lighting circuit 1002. Prepare.

The liquid crystal screen unit 1001 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 1002 turns on the lamp 500 in the lighting device 700. The lamp 500 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 3.0 [mA] to 25 [mA].

FIG. 19 illustrates the case where the low-pressure discharge lamp 500 according to the fifth embodiment is inserted into the illumination device 700 according to the seventh embodiment of the present invention as the light source device of the liquid crystal display device 1000. Not limited to this, the low-pressure discharge lamp 600 according to the sixth embodiment of the present invention can also be applied. Moreover, also about the illuminating device, the illuminating device 800 which concerns on the 8th Embodiment of this invention can also be used.

As described above, according to the configuration of the liquid crystal display device according to the tenth embodiment of the present invention, since a lamp with a small amount of mercury used is used, a liquid crystal display device with a small environmental load can be realized.

(Modification)
As described above, the present invention has been described based on the specific examples shown in the above embodiments. However, the content of the present invention is not limited to the specific examples shown in the respective embodiments. Variations can be used.
1. Modification of mercury emitter (1) Modification 1
A perspective view of Modification 1 of the mercury emitter according to the first embodiment of the present invention is shown in FIG. 20, a front view thereof is shown in FIG. 21 (a), and a plan view thereof is shown in FIG. 21 (b). The first modification of the mercury emitter according to the first embodiment of the present invention (hereinafter simply referred to as “mercury emitter 104”) is the outer shape of the mercury emitter 100 according to the first embodiment of the present invention. The shape is different. Therefore, the shape will be described in detail, and the other points will be omitted.

Mercury emitter 104 has a tapered end. Specifically, the end of the sintered body portion 105 of the mercury emitter 104 has a tapered shape 105a.

Since the end of the mercury emitter 104 has a tapered shape, it can be prevented from colliding with other mercury emitters and being damaged when transported. Further, since the end portion of the mercury emitter 104 is tapered, the mercury emitter 104 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 104 may have a tapered shape.

(2) Modification 2
A perspective view of a modified example 2 of the mercury emitter according to the first embodiment of the present invention is shown in FIG. 22, a front view thereof is shown in FIG. 23 (a), and a plan view thereof is shown in FIG. 23 (b). Modification 2 (hereinafter simply referred to as “mercury emitter 106”) of the mercury emitter according to the first embodiment of the present invention is the same as the mercury emitter 100 according to the first embodiment of the present invention. The shape of the discharge part 107 is different. Therefore, the shape will be described in detail, and the other points will be omitted.

The mercury emitter 106 has a cylindrical shape in which a through-hole 107a is formed in the axial direction including the central axis of the mercury emitter 107, for example.

Since the mercury emitter 106 has a cylindrical shape, mercury is released from both the inner surface and both sides of the sintered body portion 102 side, and the mercury release efficiency can be further improved. Further, a sintered body portion may be further formed on the inner surface of the mercury emitter 106. In this case, when high-frequency heating is performed, the high-frequency heating eddy current reaches the inner surface of the mercury emitter 106, and the heating efficiency of the mercury discharge portion 107 can be increased to further improve the mercury emission efficiency.

Further, the mercury emitter shown in FIGS. 22 and 23 has a cylindrical shape, but is not limited thereto, and may be a polygonal cylindrical shape or the like.

Incidentally, the ratio of the diameter Dh of the through hole 107a to the outer diameter Di of the mercury emitting portion 107 is preferably in the range of 5% to 60%. In this case, if Dh is too small, the release efficiency does not increase so much, and if it is too large, a predetermined mercury content cannot be obtained, and the heating efficiency also decreases.

(3) Modification 3
FIG. 24 shows a perspective view of Modification 3 of the mercury emitter according to the first embodiment of the present invention. Modification 3 (hereinafter referred to as “mercury emitter 110”) of the mercury emitter according to the first embodiment of the present invention is different in shape from the mercury emitter 100 according to the first embodiment of the present invention. Different. Therefore, the shape will be described in detail, and the other points will be omitted.

The mercury emitter 110 has a flat plate shape. Specifically, in the mercury emitter 110, a flat mercury discharge portion 111 is sandwiched between flat plate-like sintered bodies 112. In this case, since the mercury emitting part 111 is sandwiched between the two sintered body parts 112, the heating efficiency of the mercury emitting part 111 is increased, and the mercury releasing efficiency can be further improved. Moreover, since it can produce by press molding by a sheet construction method, a manufacturing process can be simplified more. However, a configuration other than the configuration shown in FIG. 24 (a plate-shaped configuration) may be employed. For example, a mercury emitter 113 shown in FIG. 25 is formed by bending the plate-like structure shown in FIG. 24 into a substantially cylindrical shape. Alternatively, as in the mercury emitter 114 shown in FIG. 26, the end surface of the mercury emitter 111 may be covered with the sintered body 112. In the case of the configuration shown in FIG. 26, the end surface of the mercury emitting portion 111 is covered with the sintered body portion 112, and the front surface and the back surface are continuous, so that the efficiency of eddy current can be improved. Can be played.

In addition, if the mercury discharge part 111 is covered with the sintered compact part 112, it is also possible to provide a slit in a part of mercury discharge part (part of the said sintered compact part). The configuration shown in FIGS. 25 and 26, but said that form slits in a part of the mercury releasing material is formed, for example, with respect to the longitudinal direction of the central axis X ₁₀₀ of the mercury releasing member 100 shown in FIG. 1 It is also possible to provide slits in parallel, vertically, or diagonally.

When a slit is provided in a part of the sintered body, the mercury emitter may facilitate the release of mercury from the slit, which may improve the mercury emission efficiency. Since the problem of a decrease in current efficiency also occurs, consideration must be given to the design when forming the slit.

(4) Modification 4
A perspective view of Modification 4 of the mercury emitter according to the first embodiment of the present invention is shown in FIG. Modification 4 (hereinafter referred to as “mercury emitter 115”) of the mercury emitter according to the first embodiment of the present invention is a flat plate of Modification 3 of the mercury emitter according to the first embodiment of the present invention. In this example, a sintered product portion 112 is laminated on a single-sided surface of a mercury discharge portion 111 in a spiral shape. Specifically, a laminate of the sintered body portion 112 and the mercury discharge portion 111 is wound in a spiral shape so that the sintered body portion 112 finally becomes the outside. In this case, one surface of the mercury emitting portion 111 may be covered with the sintered body portion 112, or both surfaces of the mercury emitting portion 111 may be covered with the sintered body portion 112.

Since such a mercury emitter 115 is entirely heated by high frequency heating including the inside thereof, the mercury emission efficiency can be further improved.

(5) Modification 5
FIG. 28 shows a perspective view of Modification 5 of the mercury emitter according to the first embodiment of the present invention. Modification 5 (hereinafter simply referred to as “mercury emitter 116”) of the mercury emitter according to the first embodiment of the present invention is different from the mercury emitter 100 according to the first embodiment of the present invention in its shape. Is different. Therefore, the shape will be described in detail, and the other points will be omitted.

In the mercury emitter 116, a band-like sintered body portion 117 is wound around a rod-like mercury emitting portion 101. With this configuration, the mercury emitting body 116 becomes the sintered body portion 117 after molding the rod-shaped body of the mercury emitting portion 101 without extruding the mercury emitting portion 101 and the sintered body portion 117 at the same time. It can be formed by winding clay.

(6) Modification 6
A partially cutaway perspective view of Modification 6 of the mercury emitter according to the first embodiment of the present invention is shown in FIG. Modification 6 of the mercury emitter according to the first embodiment of the present invention (hereinafter simply referred to as “mercury emitter 118”) is the shape of the mercury emitter 100 according to the first embodiment of the present invention. Is different. Therefore, the shape will be described in detail, and the other points will be omitted.

The mercury emitter 118 is spherical, and the sintered body 120 is laminated on the entire outside of the spherical mercury emitter 119.

Since all the outer sides of the mercury emitter 118 are covered with the sintered body portion 120, when the mercury emitter 118 is transferred, the mercury emitter 118 can be operated without directly touching the mercury emitter 119 containing mercury. , Work safety can be improved. In addition, as long as the mercury discharge | release part 119 is covered by the sintered compact part 120, not only spherical shape but polyhedron shape etc. (for example, cross-sectional rectangle, cross-sectional hexagon etc.) may be sufficient. In the case of a spherical shape, since there are no corners, it is possible to prevent the mercury emitters 118 from being damaged by colliding with each other during transfer. Moreover, in the case of a spherical shape, the transportation efficiency can be increased because the transportation container can be packed more densely than other shapes during transportation.

The present invention can be widely applied to mercury emitters, low-pressure discharge lamp manufacturing methods using the same, low-pressure discharge lamps, illumination devices, and liquid crystal display devices.

Claims (14)

1. Having a mercury emission part containing an intermetallic compound of titanium (Ti) and mercury (Hg);
   The mercury emitter, wherein the intermetallic compound contains Ti _1.73 Hg.
2. The intermetallic compound includes the Ti _1.73 Hg having a mercury amount in a range of 40 wt% to 100 wt% with respect to a total mercury amount of the mercury emitting portion. The mercury emitter according to 1.
3. 2. The mercury emitter according to claim 1, wherein the intermetallic compound is Ti ₃ Hg with the remainder excluding the Ti _1.73 Hg.
4. _3. The mercury emitter according to claim 2, wherein the intermetallic compound has a balance of Ti ₃ Hg excluding the Ti _1.73 Hg. 4.
5. The mercury emitter according to claim 1, wherein the mercury emitter is stored in a container having an opening at least in part.
6. 6. The mercury emitter according to claim 5, wherein the container is made of at least one of iron and nickel.
7. 2. The mercury emitter according to claim 1, comprising the mercury emitter and a sintered body portion made of a metal sintered body covering the mercury emitter.
8. The mercury emitting body according to claim 7, wherein the sintered body portion is formed in a porous shape.
9. The mercury emitter according to claim 6, wherein the sintered body has a porosity of 5% or more.
10. The mercury emitter according to claim 7, wherein the sintered body has a porosity of 5% or more.
11. A method of manufacturing a low-pressure discharge lamp, comprising: inserting the mercury emitter according to claim 1 into a glass tube; and heating the mercury emitter.
12. A glass tube; a lead wire sealed to at least one end portion of the glass tube; and an electrode attached to an end portion of the lead wire located inside the glass tube; 2. A low-pressure discharge lamp, wherein the mercury emitter according to claim 1 is fixed to a portion located in a glass tube or the electrode.
13. An illumination apparatus comprising the low-pressure discharge lamp according to claim 12.
14. A liquid crystal display device comprising the illumination device according to claim 13.

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