JPH04104452A - Fluorescent lamps and fluorescent lamp manufacturing methods - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a low-pressure discharge lamp, and particularly to a small-diameter low-pressure discharge lamp such as a fluorescent lamp for a backlight.

[Conventional technology]

A cold cathode discharge lamp using an electrode made of a getter material and a mercury-releasing alloy is described in Japanese Utility Model Application Publication No. 60-57052.

[Problem to be solved by the invention]

1. Conventional cold cathode fluorescent lamps have the drawbacks of not being efficient within 1 minute and having a short lifespan.

The objective of the present invention is to provide a fluorescent lamp with a small diameter, high efficiency, and long life.

[Means to solve the problem]

-' The object 1 is achieved by at least making the outer diameter of the lamp 4.0 mm or less and setting the pressure of the rare gas to +-5 Torr or more. Furthermore, the outer diameter of the above lamp is 3
, 5nwn to 1,5n+n, and by setting the pressure of the rare gas to be in the range of 20 Torr to 100 Torr, the objective can be further achieved.

[Effect]

At least the outer diameter of the fluorescent lamp should be 4-0mm or more than 1ζ
This increases the ratio of power consumption in the positive column to the power consumed in the electrodes, thus achieving high efficiency. 1 Furthermore, by setting the pressure of the rare gas to 1.5 Torr or higher, the cathode drop voltage is reduced, and therefore a low pressure discharge lamp with high efficiency and long life can be obtained.

By providing a plurality of Pereno I~ around the L metal, the surface area of the electrode and the amount of mercury enclosed can be increased without making the electrode extremely large, resulting in a long life.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 9.

First, a method for cutting a glass tube will be explained with reference to FIG. As shown in FIG. 8(a), the tube diameter is 3.5 mm and the wall thickness is 0.
A glass tube 1 made of soda glass or lead glass with a diameter of 4 mm and a total length of 1.25 Q mm was heated at the cut point 2 as shown in FIG. 8(b), and then cut as shown in FIG. 8(c). ,
It is rapidly cooled 3 to form a glass tube 4 with a total length of 250 mm, as shown in FIG. 8(d).

Other methods for cutting include a method in which a cut point is made in advance and the cut point is heated and cut, and a method is cut using a cutter.

Next, a method for washing the cut crow tube and applying phosphor will be explained with reference to FIG. As shown in FIG. 2(a), the crow tube 4 is placed vertically, and water 6 is flowed through the nozzle S in the second part of the tube to wash the bones. Thereafter, as shown in FIG. 2(b), air 8 is blown out from the nozzle 7 at the top of the glass tube 4 to remove the water inside the tube and dry it. If you blow warm air at this time, it will dry quickly.

Thereafter, as shown in FIG. 2(c), the two nozzles 9 are brought into close contact with the lower part of the glass tube 4, and the phosphor emulsion 10 is press-fitted into the tube. At this time, the emulsion is press-fitted to a point where the liquid level is about 50+mm from the second part of the tube]1, and then the emulsion]0 is sucked out from the nozzle 9. This method allows the application of any thin glass tube. The phosphor emulsion used uses an organic solvent as a binder, but an aqueous binder may also be used. In addition, a phosphor with a wavelength phosphor is used.

Next, as shown in FIG. 2(d), the glass tube 4 coated with the phosphor is dried by blowing out air 3 from the nozzle 12 at the top of the tube. As the phosphor flows down, the thickness of the phosphor film at the top of the tube becomes thinner, but when air is introduced from the top of the tube in this way, some of the phosphor dries before it flows down.
This has the advantage that the phosphor film thickness becomes uniform. Also, it is better if the air is warm. After the phosphor has completely dried, remove the phosphor from the sealing area as shown in (e) in Figure 2.
As shown in FIG.
Water or organic solvent 15 is spouted from 4 to remove the phosphor at the end of the tube.

Next, the structure of the mount used will be explained with reference to FIG. A nickel plate 16 having a width of 2 m and a length of 4 cylinders is coated with a mercury alloy 17 for releasing mercury and a getter agent 18, and is welded to a lead wire 19. The material of the lead wire at this time is, if the glass tube is soda glass, an alloy mainly composed of nickel, chromium, and iron is used, and if it is button glass, the nickel wire and Schmez I-wire are connected by welding. use something After that - 1, in the middle of the line, diameter 1.8
A glass bead 20 having a size of 11111 (slightly smaller than the inner diameter of the glass tube) is formed to form a mount 1~. At this time, the number of nickel plates coated with the mercury dispenser may be plural.

In the above embodiment, mercury was filled into the lamp using a mercury dispenser, but in the case of a lamp with an extremely small tube diameter as in the present invention, the size of the electrode is limited, so Since the amount of mercury (alloy) is also limited, the amount of mercury that can be sealed in the lamp is limited. In the case of cold cathode fluorescent lamps, the lifespan is determined by the amount of mercury, so if a mercury alloy is used as described in item 1, the lifespan will not be much longer.

If a method of introducing mercury vapor at a pressure of 2 Q Torr or more into the lamp is used, the amount of mercury enclosed can be increased, and a lamp with a long life can therefore be obtained. In addition, when using a mercury dispenser, the shape of the electrode is limited, and the lunar part of the electrode becomes a mercury dispenser. Using the method of encapsulating particles allows freedom in selecting the material and shape of the electrode, resulting in a long life.

A highly efficient lamp can be obtained.

Next, a method for firing the phosphor will be explained with reference to FIG. The upper part of the glass tube 21- coated with the phosphor (the part of the glass tube not coated with the phosphor) is grasped with the chuck 22, and the glass tube 21- is suspended in the firing furnace 23 provided with the heating element 24 inside to be fired. The temperature inside this lI4' furnace is about 500'C. At this time, if air is sent from the top of the glass tube 2 through the nozzle 25 to remove gas from the phosphor generated during firing 14, there is an advantage that the firing can be done in a short time.

Next, the sealing of the electrodes to the fired glass tube (on the chi 1 side) will be explained with reference to FIG. As shown in FIG. 5(a), the mounting 1-28 is inserted into the F part of the glass tube 26, and as shown in FIG. 5(b), a burner is applied from the periphery, and as shown in FIG. 5(c) Seal it like this. At this time, in order to prevent oxidation of the electric cell, it is desirable that N or a rare gas be introduced. Further, the glass beads 20 may not be provided to the mounting 1 on the side of the guy 1.

Next, the lamp exhaust process will be explained with reference to FIG. 6th
As shown in (a) of the figure, a mount 31 and a sealed glass tube 32 are attached to the exhaust system 30. At this time Maun l
-Align the crow bead part 31 with the sealing part of the glass tube. After that, the glass tube is placed in an exhaust furnace 33 to remove moisture adsorbed on the glass and phosphor, and at the same time, air is pumped to bring the pressure inside the glass tube to about 102 to IQ" Torr. Make sure the pressure is sufficiently lowered. (b) As shown in figure, mercury (if not using mercury dispenser)
and argon gas 35 is sealed. Next, as shown in the figure (c), the glass tube 31 arrives at the position of the glass beads at the moon 1 air side mound 1. By using this glass bead, the strength of the arrival part is increased.

Thereafter, it is separated at the sealing part as shown in the figure (d).

Next, as shown in FIG. 7, the electrode section is subjected to high-frequency heating in order to release mercury from the mercury dispenser. coil 40
1. is installed near the electrode to heat the electrode sufficiently.
Heating is performed using a high frequency of M T-I z or higher.

At this time, by heating the lamp while moving it inside the coil, the temperature of the electrode increases uniformly.

Thereafter, the lamp is lit for about 10 hours at a lamp current of 5 to 15 mA to age and complete the lamp. 1st
The figure is a cross-sectional view of the completed lamp.

The completed lamp is marked with the manufacturing lot number, but since the lamp according to the present invention has a small tube diameter, it is not possible to print a number on it. Therefore, as shown in FIG. 9, lines with different thicknesses and widths are printed on the circumference of the lamp 50,
Make it easy to understand. Also, the same effect can be obtained by printing with different line colors.

In Example 1, the discharge gas was a mixed gas of mercury gas and mercury, and the electrode was a cold cathode, but it is obvious that the discharge gas may be just a crystal gas.

〔Effect of the invention〕

According to the present invention, a small-diameter fluorescent lamp with high efficiency and long life can be obtained.

4. Brief explanation of Figure rfi'i Figures 1 to 8 are cross-sectional views of an embodiment of the present invention, and Figures
The figure is an explanatory diagram of a method for manufacturing a fluorescent lamp according to an embodiment of the present invention.
FIG. 9 is a front view showing a portion of the lamp of the present invention.

(phantom (circle) (C) (a) (vinegar Leaves figure ? i2r- Power ≠ Evil

Claims (1)

[Claims] 1. The outer diameter is 4.0 mm or less, and the rare gas pressure is 15 Torr.
A fluorescent lamp characterized in that it has a temperature of r or more.