JPS58209051A - lighting tube - 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 [Technical Field of the Invention] The present invention relates to lighting tubes, and in particular to reducing the deviation in discharge starting voltage of lighting tubes for discharge lamps such as fluorescent lamps.

This invention relates to an improvement in the structure of a lighting tube containing metal barium in an airtight container with improved working characteristics.

[Technical background of the invention]

Lighting tubes, for example lighting tubes used for lighting fluorescent lamps, have a structure in which metal barium is built into the airtight container. A suspension mixed with this type of lighting tube is applied, dried, and heated in an exhaust process to be thermally decomposed to produce metallic barium. In order to reduce the deviation in the discharge starting voltage of lighting tubes, a method is known in which barium nitride is deposited on the inner wall of the airtight container of the lighting tube, such as glass pulp, and then thermally decomposed to produce metallic barium. .

[Problems with background technology]

As stated in the technical background of the invention, barium nitride is coated on the inner wall of an airtight container such as glass pulp for the purpose of reducing the deviation in discharge starting voltage of two lighting tubes.

In the method of heating and decomposing barium metal, the decomposition of barium nitride is explosive, so the barium nitride of the glass pulp is dissipated during decomposition, and more than the necessary amount of metal barium is deposited on the electrode. A problem occurred in that the discharge starting voltage was reduced instead.

[Object of the Invention] The present invention has been made based on the above-mentioned problems in the background art, and the barium nitride deposited on the inner wall of an airtight container such as a glass tube is dissipated during thermal decomposition and is used as an electrode. Stab on l
An object of the present invention is to provide an improved lighting tube in which the amount of lithium (metal of two electrodes) is less likely to be more than 9% and has a stable 9% property.

[Summary of the invention]

The present invention is characterized in that the inner wall of the airtight container is coated with a coating made of metal (lium) and a binder, and the coating is extended to a side farther from one end of the electrode assembly, and the discharge starting voltage is This is an improved lighting tube with smaller deviations and improved working characteristics.

[Embodiments of the invention]

Details of the present invention will be explained with reference to attachment N2.

Airtight container with mixed gas or glass pulp sealed inside (
A bimetallic movable electrode (3) is fixed to one end of the +1 by end welding to the internal lead-in wire (2), and an electrode structure is installed on the fixed electrode (4) of the internal lead-in wire and the stem (5). (
Ω) or sealed. The movable electrode (3) is coated with metal barium (7), and the movable electrode (3) and the fixed electrode (
4) A predetermined discharge gap is maintained. Movable electrode (
3) and the fixed electrode (4) are connected to the outside via the stem (5) 81. (9) leads out of the airtight container (11).

(101 is the sealed end which is sealed after the inside of the airtight container (1) is evacuated and sealed with argon. The inner wall of the airtight container (+l) is covered with a metal barium coating (11
) is coated, and the -F coat (11) is coated on the electrode structure (
The electrode assembly (0) is sealed from one end (131 to far side, Sunawa).

The metal barium coating θυ applied to the inner wall of the airtight container (11) extends to the inner wall of the sealed end αα side of the airtight container (11).
4 drops and aluminum oxide AA'203 binder 0.31
A mixture of 0.65~V with η adheres to the inner wall of the airtight garbage container and is thermally decomposed to form metallic barium Ha and aluminum oxide Al2O3.
The mixture contains 0.521119 m of metal] (lithium).

Next, the completed progress of the present invention will be explained.

The present inventor deposited a band-like coating of the above-mentioned mixture of barium metal and aluminum oxide on each part of the inner wall of the airtight container of a lighting tube, and measured the change in discharge starting voltage of one lighting tube. The results are shown in FIG. That is, in Figure 2, the horizontal axis shows the discharge starting voltage of each part of the lighting tube's airtight container inner wall, and the vertical axis shows the discharge starting voltage of the lighting tube with a film deposited on that part. This is a characteristic curve of a coating of a mixture of barium and aluminum oxide, and for comparison, curve B is a characteristic curve of a lighting tube coated with only lithium (metal). The tube is a lighting tube used for a power supply voltage of 120V, and the movable electrode is coated with metal nocurium from the top to a position of 4.5 mm. In light tubes, it is necessary to start discharging at 108V or lower, and in order to prevent re-operation with the fluorescent lamp, the discharge start voltage of the light tube must not be lower than 90V.Figure 2 In curve A, the lowest value of the discharge starting voltage of the lighting tube is about 86V, which is t% higher than curve B's 80.5V.

It can be seen that the range in which a discharge starting voltage of 90V or more can be obtained is wider than that of curve B. Also.

If a coating is provided closer to the stem than the inner wall of the airtight container, which corresponds to the position where the metal barium of the movable electrode of the lighting tube is coated, the discharge of the lighting tube will decrease as the position moves away from the top of the airtight container. The starting voltage once dropped, but then rose rapidly. The above-mentioned decrease in the discharge starting voltage of the lighting tube is caused by the explosive decomposition of the converted barium due to heating during sealing and exhaust during the manufacturing process of the lighting tube, and metallic barium scatters and adheres to the electrodes. This seems to be the reason why the discharge starting voltage decreased. Further, the increase in the discharge starting voltage occurred near the sealing portion between the hermetic container and the stem, and it is thought that this is because barium nitride on the inner wall of the hermetic container was converted to hydroxide due to heating during sealing. It occurs close to the electrode in curves 1-5 that do not overlap. Therefore, in order to obtain the lighting tube 2 with a stable and desired discharge starting voltage of 90V to 108V, the coating on the inner wall of the airtight container should be made of a mixture of metallic barium and aluminum oxide, and the coating should be located at the same position as the metallic barium of the electrode. ? It is clear from FIG. 2 that it is necessary that the inner wall iA of the airtight container be located at the top side of the airtight container corresponding to the position where it is applied.

In the system experiment, the barium metal was deposited up to about 4.5 mm from the top of the electrode, but according to the inventor's experiment, the electric current was deposited up to the bend of the bimetal of the movable 11L pole. It may be applied up to 6 to 7 mm from the extreme part (,
Even if the mixture coating of barium metal and aluminum oxide on the inner wall of the airtight container extends to the inside of the airtight container corresponding to that position, the effects of the present invention are fully exhibited. Further, the above-mentioned coating on the inner wall of the airtight container may extend all the way to the top of the airtight container. For example, in a lighting tube having the structure shown in the figure, which has an exhaust pipe at the top of the airtight container, air is removed during the exhaust process. Even if undesired hydrocarbon gas flows back into the airtight container via the exhaust pipe, the getter effect of the metal barium is effective in preventing deterioration of the characteristics of the lighting tube.

〔Effect of the invention〕

As described in detail in the embodiment section of the invention, in the present invention, a coating made of barium metal and a binder is deposited on the inner wall of an airtight container, and the coating is made of barium metal on the electrode of an electrode structure. A lighting tube characterized in that the four-pole structure extends from the inner wall of the airtight container corresponding to the attached position to a side farther from one end of the airtight container to which the quadrupole structure is sealed. The discharge starting voltage is low, the deviation is small, and the working characteristics are good.The barium nitride on the inner wall of the airtight container dissipates during decomposition and adheres to the electrode. If the discharge starting voltage does not drop below the desired value,
It also has the effect of providing an improved lighting tube that does not have a discharge starting voltage higher than a desired value.
In the experimental example, the present invention was explained using an example of a 120V lighting tube, but the present invention is not limited to this, and the inventor has found that the same effect can be obtained with lighting tubes with other power supply voltages such as 100V. confirmed. The lighting tube of the present invention is different from the lighting tube having a discharge electrode of a movable electrode and a fixed electrode as in the above embodiment.
A device with both electrodes or a movable electrode can also be sufficiently effective.

Furthermore, since the present invention uses a coating of barium metal and a binder such as aluminum oxide, it has the advantage that it can be easily adhered to the inner wall of an airtight container during the manufacturing process of lighting tubes.

Furthermore, the above-mentioned binder is not limited to aluminum oxide, but also inorganic oxides such as titanium oxide, which are generally used as binders, can have the same effect as aluminum oxide.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of the lighting tube of the present invention, and FIG. 2 is a characteristic curve diagram showing the relationship between the coating portion on the inner wall of the airtight container of the lighting tube and the discharge starting voltage. l...airtight container, 3...movable electrode, 4...fixed electrode. D... Electrode structure, 7... Metallic barium deposited on the electrode, 11... Metallic barium coating on the inner wall of the airtight container. Figure 1 Figure 2

Claims (1)

[Claims] 8. The electrode structure is sealed to one end of an airtight container in which an easily discharging electric body is sealed, and has a movable electrode or a fixed electrode and a movable electrode, and metal barium is coated on the electrode. Is there a coating made of barium metal and a binder applied to the inner wall of the airtight container? The above-mentioned coating is characterized in that it extends to a side farther from one end of the airtight container to which the electrode structure is sealed on the inner wall of the airtight container, which corresponds to the position where the metal barium of the electrode of the electrode structure is deposited. Lighted tube.