KR100516607B1 - Cold cathode discharge lamp and method of manufacturing the discharge lamp - Google Patents

Abstract

An object of the present invention is to provide a cold cathode discharge lamp which can be started quickly even in a dark of 0.1 lux or less. A cold cathode discharge lamp in which electrodes 5a are provided at both ends of the glass tube 2 having the phosphor layer 3 formed on the inner surface thereof to seal the encapsulating material, wherein at least one electrode 5a is made of a starting auxiliary metal. The 1st film 8 is provided, and the 2nd film 9 and the electrode are provided by providing the 2nd film 9 which consists of said starter auxiliary metal on the inner surface of the glass tube 2 near the 1st film 8. Weak discharge occurs between (5a) or between the second film (9) and the first film (8).

Description

COLD CATHODE DISCHARGE LAMP AND METHOD OF MANUFACTURING THE DISCHARGE LAMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cold cathode discharge lamps used for backlights of various liquid crystal display devices and the like, and more particularly to cold cathode discharge lamps in which good starting characteristics are obtained even when the ambient illuminance is low.

In the cold cathode discharge lamp assembled and used in the liquid crystal device, the outer peripheral light hardly reaches the surface of the cold cathode discharge lamp due to the structure of the liquid crystal device, and the ambient illuminance near the cold cathode discharge lamp tends to be a dark environment of 10 lux or less. When the cold cathode discharge lamp is started in such a dark environment, when the initial number of electrons in the cold cathode discharge lamp which causes discharge is insufficient, starting within 500 m seconds under the original bright environment may take several to several tens of seconds. You will need In general, in cold cathode fluorescent lamps used in liquid crystal devices, immediately starting in a dark environment of 0.1 lux or less is desired. Hereinafter, starting of the cold cathode discharge lamp in such a dark environment will be described.

In order to improve the dark startup characteristics, Japanese Patent Application Laid-Open No. 4-121944 discloses electrons on the inner surface of the valve near the cold cathode with the stimulation energy of the work function or less in the dark, and includes aluminum oxide, magnesium oxide, zinc oxide, Disclosed is a cold cathode discharge lamp coated with an electron-emitting material made of any one of metal oxides such as lead oxide.

Further, Japanese Patent Application Laid-Open No. 2001-15065 discloses a cold cathode discharge lamp in which a cesium compound is coated on an electrode to improve starting characteristics.

However, in the cold cathode discharge lamp configured as described above, although the dark starting characteristic is seen to be improved, there is still a slow start. In addition, the cold cathode discharge lamp coated with an electron-emitting material has an average fast startup characteristic in the dark state, compared with not applying an electron-emitting material on its inner surface, but also includes a slow start-up characteristic among them.

BRIEF DESCRIPTION OF THE DRAWINGS The sectional drawing which shows the principal part of the cold cathode discharge lamp in Example 1 of this invention, and its XX 'cross section figure.

2 is a cross-sectional view of a cold cathode discharge lamp of a comparative product for comparing the embodiment with the starting characteristics.

3 is a lighting probability distribution diagram of the embodiment and the comparative product of the embodiment.

Fig. 4 is a sectional view showing a main portion of a cold cathode discharge lamp in accordance with the second embodiment of the present invention, and a cross-sectional view taken along line X-X '.

Fig. 5 is a cross sectional view showing a main portion of a cold cathode discharge lamp before the coating of the starting auxiliary metal film is formed on the inner surface of the light emitting tube in the embodiment;

Fig. 6 is a sectional view showing a main portion of a cold cathode discharge lamp in accordance with the third embodiment of the present invention.

Fig. 7 is a sectional view showing the main parts of still another example of the cold cathode discharge lamp in the embodiment;

Fig. 8 is a sectional view showing a main portion of a cold cathode discharge lamp in accordance with the fourth embodiment of the present invention.

9 is a measurement result diagram of start-up delay times of Examples and Comparative Examples of Examples 2 to 4. FIG.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cold-cathode discharge lamp which can start more quickly even in the dark of 0.1 lux or less.

The cold cathode discharge lamp of the present invention is a cold cathode discharge lamp in which electrodes are provided at both ends of a glass tube in which a phosphor layer is formed on an inner surface thereof to seal an encapsulating material, and the electrode is provided with a first coating made of a starting auxiliary metal. A second film made of a starting aid metal is provided on the inner surface of the glass tube in close proximity to the first film.

The cold cathode discharge lamp of the present invention is characterized in that the electrode is provided with a coating made of the starting auxiliary metal only on the inner surface of the glass tube without providing a coating made of the starting auxiliary metal.

The cold cathode discharge lamp according to claim 1 of the present invention is a cold cathode discharge lamp in which electrodes are sealed at both ends of a glass tube having a phosphor layer formed on an inner surface thereof, and the sealing material is sealed, and at least one electrode is made of a starting auxiliary metal. 1 film is provided, and the 2nd film which consists of a starting auxiliary metal is provided in the inner surface of the said glass tube in the vicinity of the said one electrode, near the said 1st film.

The cold cathode discharge lamp of Claim 2 of this invention was formed in the position which does not overlap with the said phosphor layer formed in the inner surface of a glass tube of Claim 1, It is characterized by the above-mentioned.

The cold cathode discharge lamp according to claim 3 of the present invention is characterized in that the electrode has a tube shape and the first film is provided on an outer circumference thereof.

The cold cathode discharge lamp according to claim 4 of the present invention is characterized in that the second coating is an alkali metal or an alkaline earth metal or a mixture thereof.

The cold cathode discharge lamp according to claim 5 of the present invention is the method according to any one of claims 1 to 3, wherein the first film is formed of an alkali metal compound or an alkaline earth metal compound or a mixture thereof, and the second film is an alkali metal. Or an alkaline earth metal or a mixture thereof.

In the cold cathode discharge lamp according to claim 6 of the present invention, the first film is formed of a cesium compound, and the second film is formed of cesium.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a cold cathode discharge lamp in which at least one end of the glass tube is manufactured by providing electrodes at both ends of a glass tube having a phosphor layer formed on an inner surface thereof to seal a sealing material. At the end of the electrode, an electrode having a first coating of the starting auxiliary metal is disposed, the encapsulating material is sealed, and the electrode is energized by aging a current exceeding a normal lighting current, thereby aging the first coating. Sputtering to form a second film at a position that does not overlap with the phosphor layer formed on the inner surface of the glass tube, terminating the aging in a state where the first film is not lost from the surface of the electrode, and the first film, A second film is formed on the inner surface of the glass tube.

The cold cathode discharge lamp according to claim 8 of the present invention is a cold cathode discharge lamp having a light emitting tube in which cylindrical electrodes are provided at both ends of a glass tube having a phosphor layer formed on its inner surface to seal an encapsulating material, and in the vicinity of at least one electrode. In the inner surface of the light emitting tube of the present invention, a coating film made of an auxiliary metal made of an alkali metal or an alkaline earth metal is provided, and the one electrode is connected to the high voltage side of the lighting circuit.

The cold-cathode discharge lamp of Claim 9 of this invention is the starter auxiliary metal which forms the said film | membrane, The quantity of sputter | spatter by the rare gas ion of 100-600 eV of the base metal which forms the said electrode. It is characterized by being a metal with a larger sputtering amount.

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The cold-cathode discharge lamp of Claim 12 of this invention is a film | membrane which consists of a starting auxiliary metal of Claim 8 or 9 provided in the inner surface of the glass tube in which the phosphor layer is not formed in the vicinity of at least one electrode, It is characterized by the above-mentioned. It is done.

In the manufacturing method of the cold cathode discharge lamp of Claim 13 of this invention, when manufacturing the cold cathode discharge lamp which sealed the sealing material by providing cylindrical electrodes in the both ends of the glass tube in which the fluorescent layer was formed in the inner surface, At least one end is provided with an electrode having a starter auxiliary metal made of an alkali metal or an alkaline earth metal, and is energized by aging a high current exceeding a normal lighting current to the electrode on the side having the starter auxiliary metal. By sputtering the starter auxiliary metal to form a film made of the starter auxiliary metal on the inner surface of the light emitting tube.

The method for manufacturing a cold cathode discharge lamp according to claim 14 of the present invention is characterized in that the aging current is about 2 to 3 times the normal lighting current according to claim 7 or 13.

Hereinafter, each Example of this invention is described using FIGS. In addition, since the structure of both ends is the same as the cold cathode discharge lamp here, only one side is shown.

(Example 1)

(A) and (b) of FIG. 1 show Example 1 of this invention, and FIG. 1 (b) is sectional drawing along the XX 'line | wire in (a).

As shown in FIG. 1, the phosphor layer 3 is formed in the inner surface of the glass tube 2, and the tube-shaped electrode 5a which the edge of the discharge side is opened is provided in the both ends, and a suitable quantity The encapsulation material is sealed to constitute the light emitting tube 1. A metal inner lead wire 4 is connected to the end of the at least one electrode 5a on the non-discharge side, and an outer lead wire 7 is connected to the inner lead wire 4.

The electrode 5a is provided with a first coating 8 made of a starting auxiliary metal, and a second film 9 made of a starting auxiliary metal is formed on an inner surface of the glass tube 2 on an inner surface of the glass tube 2. It is formed in the position which does not overlap with the phosphor layer 3.

The first film 8 is formed of an alkali metal compound or an alkaline earth metal compound or a mixture thereof, and the second film 9 is formed of an alkali metal or alkaline earth metal or a mixture thereof.

Hereinafter, a specific example is given and described.

The glass tube 2 is formed from the hard material which consists of borosilicate glass, and is made into 300 mm in total length, 2.4 mm in outer diameter, and 2.0 mm in inner diameter. On the inner surface of the glass tube 2, the three-wavelength inverse light-emitting phosphor is coated to have a film thickness of about 20 mu m, and the phosphor layer 3 is formed.

The inner lead wire 4 is made of tungsten, which is a material in which the glass tube 2 is formed and the expansion coefficient is approximated. As the external lead wire 7, a nickel wire having an outer diameter of 0.6 mm was used.

Both ends of the glass tube 2 are made of molybdenum, and the electrode 5a having an outer diameter of 1.7 mm, an inner diameter of 1.3 mm, and a total length of 3 mm to 5 mm is provided. The first film 8 is formed over a length of 0.5 mm or more and 3 mm or less (preferably 1.5 ± 0.5 mm) in the electrode length direction with an application amount of 10 µg or more and less than 100 µg (preferably 40 ± 20 µg). have.

This second film 9 is formed at a predetermined position as follows.

The first film 8 is applied to the electrode 5a, a mixed rare gas of mercury, argon and neon is sealed at about 8 kPa, and the light emitting tube 1 which is not provided with respect to the second film 9, Aging current that is about 2 to 3 times the normal lighting current, for example, when the normal lighting current is 8 mA, an aging current of about 18 mA to 25 mA is applied to the aging current, thereby aging the electrode 5a during aging. The coated first film 8 is sputtered to form a coating on the inner surface of the glass tube 2.

Here, the aging time is terminated in a state where the first film 8 is not lost from the surface of the electrode 5a, leaving the first film 8 on the surface of the electrode 5a, and on the inner surface of the glass tube 2. It is about 10 minutes as time to form the 2nd film 9 of appropriate film thickness.

During aging, discharge occurs and sputters from the opening on the discharge side of the tube-shaped electrode 5a to the outer circumference where the first film 8 is coated, but at the normal lighting current, the discharge of the electrode 5a is the first film. Since it does not reach the outer periphery to which (8) is applied, the 1st film 8 and the 2nd film 9 after completion of aging are stable, and are not lost during use.

In this manner, the first coating film 8 is provided on the surface of the electrode 5a in advance, and sputtering the start-up auxiliary metal by aging and coating the inner surface of the glass tube 2 to coat the inner surface of the electrode 5a. Can form a uniform second film 9.

According to this configuration, even in a dark environment, minute discharge occurs between the second film 9 and the electrode 5a, or between the second film 9 and the first film 8, and thus the cold cathode discharge lamp Since the initial electrons required for start-up are supplied in the inside, it is possible to realize a cold cathode discharge lamp having a small decrease in the initial luminance and a good dark start characteristic.

Using the cold cathode discharge lamp configured as described above as Example A, the dark startup delay time with Comparative Example A described below was measured. The number of samples was 100 pieces.

In Example A, the first film 8 was formed of cesium compound which is one of the alkali metal compounds, and the second film 9 was formed of cesium which is one of the alkali metals. As shown in FIG. 2, the comparative article A was not formed with the second coating 9.

The test conditions were to leave the product A and the comparative product A in the dark with an ambient light of 0.1 lux for 48 hours, and then the high frequency lighting circuit (not shown) with an output voltage of 1200 Vrms under the ambient light of 0.1 lux, ambient temperature of 0 ° C. and no wind. The dark start delay time was investigated. The obtained measurement result is shown in FIG.

As is apparent from Fig. 3, in Example A, 90% of the samples are lit at 0.9 m sec, while in Comparative A, the lighting time is varied from 1 m to 250 m sec, and the lamp exceeding 500 m sec. 6% occurred. In the case of Embodiment A, a weak discharge occurs between the first coating 8 and the second coating 9 or between the second coating 9 and the first coating 8, and is required for starting in the low-pressure discharge lamp. A cold cathode discharge lamp was obtained in which initial electrons were supplied and the dark start characteristics were considerably good.

In the case where the structures of the electrodes 5a at both ends are different from each other, it is preferable that the electrodes on the side where the first film 8 is formed on the surface thereof are connected to the high voltage side of the lighting circuit.

As the material of the first film 8, compounds such as Li, K and Rb of an alkali metal (Group I in the periodic table) can be used in place of the cesium compound. Compounds such as Be, Mg, Ca, Sr, and Ba of an alkaline earth metal (group II of the periodic table) can be used.

In addition, in Example 1, although the shape of the electrode 5a was a tube shape, even if it was a rod-shaped shape which does not have an opening at the discharge side, the cold cathode discharge lamp which was considerably good dark start characteristic was obtained compared with the conventional product. . In this case, however, in order to stably maintain the states of the first and second coatings 8 and 9 over a long period of time, it is preferable to limit the normal lighting current lower than that of the embodiment A in which the electrode 5a is shaped like a tube. need.

Furthermore, in comparison with the embodiment of Japanese Patent Application Laid-Open No. 2001-15065, in the case of Japanese Patent Application Laid-Open No. 2001-15065, the external light that reaches the cesium compound provided on the electrode is a light emitting layer coated on the inside of the glass tube (the above-described implementation). Most of the light attenuated through the phosphor layer 3 in the example is attenuated, and as in the above embodiment of the present invention, the phosphor layer having the second coating 9 formed on the inner surface of the glass tube 2 ( The present invention is conventionally formed in that it does not overlap with 3) and does not expect good dark starting characteristics as compared with the fact that external light does not attenuate and enter the second film 9 to generate a small discharge. It is different from technology.

(Example 2)

4 and 5 show a second embodiment of the present invention, and FIG. 4B is a cross-sectional view taken along the line X-X 'of FIG. 4A.

As shown in (a) and (b) of FIG. 4, the phosphor layer 3 is formed on the inner surface of the glass tube 2, and electrodes 5b are provided at both ends thereof, and an appropriate amount of encapsulating material is provided. This is sealed and the light emitting tube 1 is comprised. A metal inner lead wire 4 is connected to the end of the electrode 5b on the non-discharge side, and an outer lead wire 7 is connected to the inner lead wire 4.

On the inner surface of the light emitting tube 1, a coating film 9a made of a starter auxiliary metal is formed close to the electrode 5b.

In the cold cathode discharge lamp configured as described above, since the weak discharge occurs between the electrode 5b and the coating 9a made of the starting auxiliary metal, and the initial electrons required for starting are supplied, the cold cathode discharge lamp has a fairly good dark start characteristic. Can be obtained.

Hereinafter, a specific example is given and described.

The glass tube 2 is formed of the hard material which consists of borosilicate glass, Comprising: It is 300 mm in total length, 2.4 mm in outer diameter, and 1.8 mm in inner diameter. On the inner surface of the glass tube 2, the three-wavelength inverse light emitting phosphor is coated and coated so that the film thickness is about 20 mu m, and the phosphor layer 3 is formed.

On both ends of the glass tube 2, a rod-shaped electrode 5b made of niobium having a total length of 5 mm and an outer diameter of 1.0 mm is provided, and one end of the non-discharge side of the electrode 5b has an inner lead line of an outer diameter of 0.8 mm (4). ) Is welded. The inner lead wire 4 is formed of tungsten, which is a material of which the forming material of the glass tube 2 and the expansion coefficient are approximated, and both ends of the light emitting tube 1 are sealed by the inner lead wire 4 and the glass tube 2, Inside the light emitting tube 1, a mixed rare gas (not shown) of mercury, argon, and neon is enclosed with about 8 kPa. The other end of the inner lead wire 4, one end of which is connected to the electrode 5b, is connected to an outer lead wire 7 made of nickel having an outer diameter of 0.6 mm.

On the inner surface of the light emitting tube 1 in the vicinity of the electrode 5b, a film 9a having a film thickness of 2 탆 made of a starting auxiliary metal is formed. The starting auxiliary metal is made of a metal in which the amount of sputtering is greater than the amount of sputtering by rare gas ions in the range of 100 to 600 eV of the base metal of the electrode 5b, where the amount of sputtering is higher than that of niobium, which is the base metal of the electrode 5b. Large nickel is used.

This film 9a is formed by the following procedure.

Nickel having a sputtering amount (atoms / ion) greater than niobium with a low energy rare gas ion in the range of 100 to 600 eV on the surface of niobium forming electrode 5b is formed by a method such as electroplating, electroplating, sputter deposition, or the like. . The film thickness of nickel is about 5 micrometers so that the film thickness of the film 8a formed in the inner surface of the light emitting tube 1 may be about 2 micrometers so that it may mention later.

The inner lead wire 4 is connected to one end of the electrode 5b coated with nickel on the surface of niobium by laser welding or the like, and the cold cathode discharge lamp is assembled by a conventional manufacturing method.

FIG. 5 shows a state immediately after assembling as a previous stage of the cold cathode discharge lamp shown in FIG. 4. In this state, the coating film 9a is not formed on the inner surface of the light emitting tube 1, and nickel, which is an auxiliary metal for starting, is coated on the surface of the electrode 5b to form the coating film 8a.

Next, when this electrode 5b is energized with a high current of 6 mA or more, for example, 15 mA, which is a normal lighting current, and is aged for about 2 hours, nickel coated on the surface of niobium is sputtered during aging. Then, the film is coated on the inner surface of the light emitting tube 1 adjacent to the electrode 5b, and a film 9a having a thickness of about 2 m is formed.

Thus, the coating film 8a which consists of a starting auxiliary metal is provided in advance on the surface of the electrode 5b, sputter | spatters the starting auxiliary metal by aging, and coats and attaches it to the inner surface of the light emitting tube 1, and thus electrode 5b The cold cathode discharge lamp can be formed on the inner surface of the light emitting tube 1 adjacent to the film 9a of a starting auxiliary metal having a uniform film thickness in a short time, and has a low initial luminance and a good dark startup characteristic. Can be easily realized.

As a cold-cathode discharge lamp produced as described above as Example B, dark starting characteristics were examined as follows.

The test conditions were left for 48 hours in the dark of 0.1 lux of ambient illuminance, and then darkened by using a high frequency lighting circuit (not shown) with an output voltage of 1200 Vrms under ambient lux of 0.1 lux, ambient temperature of 0 ° C. and no wind. The start delay time was investigated. The obtained measurement result is shown in FIG.

In addition, for comparison, instead of the coating film 9a made of nickel, lead oxide, which is a metal oxide-based electron-emitting material that emits electrons with a stimulus energy having a work function or less in the dark, is applied to the inner surface of the light emitting tube 1 and cooled. A cathode discharge lamp was produced. This cold cathode discharge lamp was investigated as a comparative product B with respect to the dark start delay time under the same test conditions as described above. The measurement result of the obtained comparative product B is shown in FIG.

As is clear from Fig. 9, in the case of Example B and Comparative B, there is almost no difference in the average dark starting delay time, but the maximum dark starting delay time is 280 m second for 6030 m seconds of Comparative B. There was no big delay like the comparative product B. Thus, in Example B in Example 2, the electrode 5b and the starting auxiliary metal are provided on the inner surface of the light emitting tube 1 by providing the film 9a which consists of starting auxiliary metal which adjoins the electrode 5b. Since a weak discharge is generated between the film 9a which consists of a film | membrane, and the initial electrons required for starting are supplied to the low voltage discharge lamp, the cold cathode discharge lamp with a fairly dark start characteristic can be obtained.

In addition, as shown in Fig. 5, it is preferable that the electrode 5a on which the coating film 8a made of the starting auxiliary metal is formed is connected to the high voltage side of the lighting circuit. That is, in the above embodiment B, since both ends of the low voltage discharge lamp have the same structure, the electrode 5b having the coating 8a is connected to the high voltage side of the lighting circuit, but, for example, the structure of both ends is different. It is preferable that the electrode on the side of which the auxiliary metal for starting is provided on the surface is connected to the high voltage side of a light circuit.

In order to confirm this, a cold cathode discharge lamp having different structures at both ends of the low pressure discharge lamp was manufactured to obtain Example C. The electrode on the side where the coating film 8a made of the starting auxiliary metal of this Example C was not provided was connected to the high voltage side of the lighting circuit, and the dark start delay time was measured under the same conditions as in Example B. The number of samples was 100 pieces. The obtained measurement result is shown in FIG.

As apparent from Fig. 9, in the case of the embodiment C in which the electrode on the side where the starting auxiliary metal 8a is not provided is connected to the high voltage side of the lighting circuit, the dark starting characteristic is better than the comparative product B. Compared with Example B, the average dark start delay time of Example C is increased to 250 m seconds, and the maximum dark start delay time is also 480 m seconds.

When the output voltage of the high frequency lighting circuit is applied, the electric field between the electrode close to the distance and the coating made of the starting auxiliary metal becomes stronger, so that an initial discharge occurs between the electrode and the coating made of the starting auxiliary metal. It is considered that the necessary initial electrons are supplied. In this way, dark startability can be remarkably improved by connecting the electrode on the side on which the start auxiliary metal is provided to the high voltage side of the lighting circuit.

In the above description, the example in which the surface of the electrode 5b is covered with the coating 8a made of the starting auxiliary metal has been described. However, the present invention is not limited thereto, and at least the surface of the electrode 5b is used for starting. Auxiliary metals need only be installed.

(Example 3)

6 shows Example 3 of the present invention.

In the third embodiment, a tube-like electrode 5a is used instead of the rod-shaped electrode 5b, and the coating film 9b made of a starting auxiliary metal is formed on the inner surface of the light emitting tube 1 adjacent to the opening of the electrode 5a. ), Which is different from the above embodiment.

Specifically, the electrode 5a is made of molybdenum, and has an outer diameter of 1.5 mm, an inner diameter of 1.3 mm, and an overall length of 3 mm. On the inner surface of the light emitting tube 1 adjacent to the opening of the electrode 5a, a film 9b having a film thickness of 2 탆 made of nickel, which is a starter auxiliary metal, is formed.

The film 9b is formed on the inner surface of the electrode 5a by sputter deposition in advance to form a nickel film having a thickness of about 5 μm, and has a high current of 6 mA or more, which is a normal lighting current, for example, 15 mA of 2 to 3 times. By applying current to the electrode 5a for aging for about 2 hours, nickel deposited on the inner surface of the electrode 5a is sputtered during aging to coat the inner surface of the light emitting tube 1 close to the opening of the electrode 5a. Is attached.

The cold cathode discharge lamp configured as described above was used as Example D, and the electrode 5a having the nickel film formed thereon was connected to the high voltage side of the lighting circuit, and the dark startup delay time was measured under the same conditions as in Example 2. The number of samples was 100 pieces. The obtained measurement result is shown in FIG.

As shown in FIG. 9, the average dark start delay time of Example D was 70 msec, the maximum dark start delay time was 150 msec, and it became more favorable than the dark start characteristic of Example B of Example 2 above. .

Thus, the tube-shaped electrode 5a is used as an electrode, and the starting auxiliary metal provided in the inner surface is coat | covered and attached to the inner surface of the light emitting tube 1 by aging, and consists of the electrode 5a and a starting auxiliary metal. The distance of the film 9b is shorter than that of the cold cathode discharge lamp in the second embodiment, and the electric field between the electrode 5a and the film 9b becomes stronger, so that the initial transfer necessary for starting is more easily supplied. Therefore, a remarkable improvement in the dark start characteristic can be realized.

In the above description, although the coating film made of the auxiliary metal for starting is formed on the inner surface of the electrode 5a and sputtered on the inner surface of the light emitting tube 1 by aging, the coating film 9b is formed, but the present invention is limited thereto. As shown in FIG. 7, a film 8b made of an auxiliary metal for starting is formed on the outer surface of the electrode 5a, and the film 8b is sputtered by aging similarly to the light emitting tube 1. The film 9c may be formed on the inner surface of the film. In FIG. 7, the aging for about 30 minutes is performed at a current of 20 mA greater than the above description, whereby the number of electrons required for discharging cannot be secured only by the inner surface of the electrode, and the discharge is located near the opening from the inside of the electrode 5a. Part of the outer surface of the electrode 5a becomes strong, and sputtering near the strong opening in the electrode 5a becomes strong, so that the thickness of the film 8b and the film 9c is both open and thin. It is. However, by increasing the aging current, the discharge can be widened to the entire outer circumferential surface of the cylindrical electrode 5b, and the film 8b can be sufficiently sputtered, for example, as in the film 9a shown in FIG. have.

(Example 4)

8 shows Example 4 of the present invention.

This embodiment differs from the third embodiment in that the film 9d is formed in the vicinity of the electrode 5a and on the inner surface of the light emitting tube 1 in the part where the phosphor layer 3 is not formed.

That is, the cold cathode discharge lamp in this embodiment is different from the cold cathode discharge lamp shown in Figs. 6 and 7, and the phosphor layer 3 is not extended to a position facing the outer surface of the electrode 5a. In the inner surface of the light emitting tube 1 near the open end of the electrode 5a, the glass tube 2 is exposed, and a film 9d made of a starting auxiliary metal is formed near the open end of the electrode 5a. .

Thus, the phosphor layer having several microns of unevenness on the surface is formed by sputtering the auxiliary metal for direct start on the inner surface of the glass tube 2 having good surface smoothness rather than on the phosphor layer 3 to form a coating 9d. The film 9d with higher accuracy than the film formed in 3) can be obtained.

Using the cold cathode discharge lamp configured as described above as Example E, the electrode 5a was connected to the high voltage side of the lighting circuit, and the dark startup delay time was measured under the same conditions as in Example 2. The number of samples was 100 pieces. The obtained measurement result is shown in FIG.

As shown in FIG. 9, the average dark start delay time of Example E was 30 m seconds, the maximum dark start delay time was 120 m seconds, and the dark start delay characteristics were better than those of Example D in Example 3. .

In each of the above embodiments, the electrodes 5a and 5b have been described with ones made of a single metal as an example, but the present invention is not limited thereto, and an alloy or a sintered metal can be applied. The present invention can also be applied to an alloy, a sintered metal or the like as appropriate.

In each of the above embodiments, the same structure of both ends of the cold cathode discharge lamp has been described as an example. However, the present invention is not limited thereto, and at least one end may be configured as described above.

In addition, the cold cathode discharge lamp of this invention is not limited to each said Example, The dimension, a design, a material, a shape, a specification, etc. can be selected suitably. The electrode may be, for example, a cylindrical, bottomed or bottomless electrode, as well as the rod-shaped electrode or cylindrical electrode, and the cylindrical electrode has a structure of two or more layers, It will not specifically limit, if it shows a practical effect, such as that an emitter substance etc. are apply | coated to the inner surface.

As described above, the cold cathode discharge lamp of the present invention is a cold cathode discharge lamp in which electrodes are provided at both ends of a glass tube having a phosphor layer formed on an inner surface thereof, and the sealing material is sealed, and at least one electrode is made of a starting auxiliary metal. 1st film | membrane, and the 1st film | membrane which consists of a starting auxiliary metal by providing the 2nd film which consists of a starting auxiliary metal close to the said 1st film in the inner surface of the said glass tube in the vicinity of the said one electrode, and Since the weak discharge occurs between the second films and the initial electrons required for starting are supplied into the cold cathode discharge lamp, the dark starting characteristic is quite good.

In addition, the manufacturing method of the cold cathode discharge lamp of the present invention in the manufacture of a cold cathode discharge lamp sealing the sealing material by providing electrodes at both ends of the glass tube formed with a phosphor layer on the inner surface, at least one end of the glass tube The electrode having the first coating of the starting auxiliary metal is disposed, the encapsulating material is sealed, the electrode is energized by aging a current exceeding the normal lighting current, and the aging is performed to sputter the glass. A second film is formed at a position that does not overlap with the phosphor layer formed on the inner surface of the film, and the aging is terminated in a state where the first film is not lost from the surface of the electrode, and the first film and the glass tube on the surface of the electrode. Since the second film is formed on the inner surface, the cold cathode discharge lamp of the present invention can be easily realized.

In addition, the cold cathode discharge lamp of the present invention is a cold cathode discharge lamp having a light emitting tube in which electrodes are provided at both ends of a glass tube in which a phosphor layer is formed on an inner surface thereof to seal an encapsulating material. By providing a film made of a starter auxiliary metal on the inner surface of the light emitting tube, a weak discharge is generated between the film made of the starter auxiliary metal and the electrode, so that the initial electrons required for starting are supplied into the cold cathode discharge lamp. It becomes a cold cathode discharge lamp with a very good characteristic.

In addition, the manufacturing method of the cold cathode discharge lamp of the present invention in the manufacture of a cold cathode discharge lamp having a light emitting tube sealing the sealing material by providing electrodes at both ends of the glass tube with a fluorescent layer formed on the inner surface, at least the An electrode having a starter auxiliary metal is provided at one end, and the electrode on the side having the starter auxiliary metal is energized by aging a high current equal to or higher than a normal lighting current. The aging starter is sputtered by the aging. Since a film made of a starting auxiliary metal is formed on the inner surface of the light emitting tube, the cold cathode discharge lamp of the present invention can be easily realized.

Claims (14)

A cold cathode discharge lamp in which electrodes are provided at both ends of a glass tube having a phosphor layer formed on an inner surface thereof to seal an encapsulating material. At least one electrode is provided with a first film made of a starter auxiliary metal, A cold cathode discharge lamp, characterized in that a second coating made of a starting auxiliary metal is provided on the inner surface of the glass tube in the vicinity of the one electrode. The cold cathode discharge lamp according to claim 1, wherein the second film is formed at a position not overlapping with the phosphor layer formed on the inner surface of the glass tube. The cold cathode discharge lamp according to claim 1 or 2, wherein the electrode has a tube shape and the first film is provided on an outer circumference thereof. The cold cathode discharge lamp according to any one of claims 1 to 3, wherein the second coating is an alkali metal or an alkaline earth metal or a mixture thereof. The method according to any one of claims 1 to 3, wherein the first film is formed of an alkali metal compound or an alkaline earth metal compound or a mixture thereof, A cold cathode discharge lamp, characterized in that the second film is formed of an alkali metal or an alkaline earth metal or a mixture thereof. A cold cathode discharge lamp according to claim 5, wherein the first film is formed of cesium compound and the second film is formed of cesium. In the manufacture of a cold cathode discharge lamp sealing the sealing material by installing electrodes at both ends of the glass tube formed with a phosphor layer on the inner surface, At least one end of the glass tube is disposed with an electrode having a first coating of a starter auxiliary metal, and the encapsulating material is sealed. Aging is performed by energizing the electrode with a current exceeding a normal lighting current, and sputtering the first film by this aging to form a second film at a position not overlapping with the phosphor layer formed on the inner surface of the glass tube, The said aging is complete | finished in the state in which the 1st film | membrane is not lost from the surface of the said electrode, The 1st film | membrane is formed in the surface of an electrode, and the 2nd film | membrane is formed in the inner surface of the glass tube, The manufacturing method of the cold cathode discharge lamp characterized by the above-mentioned. A cold-cathode discharge lamp having a light emitting tube in which cylindrical electrodes are provided at both ends of a glass tube having a phosphor layer formed on an inner surface thereof to seal a sealing material. On the inner surface of the light emitting tube in the vicinity of at least one electrode, a film made of a starting auxiliary metal made of an alkali metal or an alkaline earth metal is provided. And said one electrode is connected to the high voltage side of the lighting circuit. The cold cathode discharge according to claim 8, wherein the starting auxiliary metal forming the coating is a metal having a larger sputtering amount than a sputtering amount due to a rare gas ion in the range of 100 to 600 eV of the base metal forming the electrode. lamp. delete delete 10. The cold cathode discharge lamp according to claim 8 or 9, wherein a film made of a starter auxiliary metal is provided on the inner surface of the light emitting tube in which the phosphor layer is not formed in the vicinity of at least one electrode. In manufacturing a cold cathode discharge lamp in which a cylindrical electrode is provided at both ends of a glass tube in which a fluorescent layer is formed on an inner surface to seal a sealing material, At least one end of the glass tube is provided with an electrode having a starting auxiliary metal made of an alkali metal or an alkaline earth metal, and is energized by aging a high current exceeding a normal lighting current to an electrode on the side having the starting auxiliary metal. , And sputtering the starter auxiliary metal by this aging to form a film made of the starter auxiliary metal on the inner surface of the light emitting tube. The method of manufacturing a cold cathode discharge lamp according to claim 7 or 13, wherein the aging current is about 2 to 3 times the normal lighting current.