JPH01225058A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain almost no flickering of light, little blackening of a tube wall and a long life by fitting a main electrode constituted of a triple coil and an auxiliary anode, sealing the specific starting gas in a bulb, and operating a lamp under the specific tube wall load. CONSTITUTION:A main electrode 5 constituted of a triple coil and an auxiliary anode 6 are fitted to both ends of a glass bulb 1, the starting gas consisting of argon 90% or above and the remainder of neon is sealed in the bulb 1 at the pressure of 1.7-2.0Torr, the lamp is operated under the tube wall load of 500W/m<2> or above. The luminous efficiency is improved by decreasing the sealing pressure of the starting gas, the ion shock is mitigated by combining neon with small specific gravity with argon as the starting gas. The electrode is constituted of the triple coil to easily improve the electrode load and mitigate the anode vibration, the flickering of brightness resulting from the improvement of the electrode load and the decrease of the sealing pressure and the ion shock and anode vibration are further mitigated by providing the auxiliary anode. The early blackening and flickering of light can be thereby prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a fluorescent lamp that has improved brightness and reduced flickering and blackening of the light to extend its life. It is suitable for load lamps.

(Prior art) Conventional high-efficiency fluorescent lamps have electrodes made of triple coils sealed at both ends of a glass bulb, and a starting gas made of pure argon is sealed together with an appropriate amount of mercury at a pressure of 2.2 Torr or more. be.

(Problems to be Solved by the Invention) In recent years, there has been a demand for brighter and more efficient lamps. On the other hand, it is possible to improve the luminous efficiency by lowering the charging gas pressure of the starting gas, but if the charging pressure of the starting gas is too low, various problems will occur. Furthermore, there is a limit to the anode vibration suppressing effect of the triple coil electrode.

For example, if the starting gas fill pressure is below 2.0 Torr, ion bombardment against the electrodes will increase, sputtering will increase, causing early blackening, and brightness flickering will increase. Furthermore, the sealed gas pressure is 1.7 Torr.
If it falls below this, in addition to the above-mentioned disadvantages, the amount of far-infrared radiation with a wavelength of 185 nm increases as the electron temperature rises, resulting in the disadvantage of accelerating the deterioration of the phosphor and further reducing the luminous efficiency. This drawback is particularly noticeable when operating at a tube wall load of 500 W/rrr or more.

Therefore, conventionally, the lower limit of the sealed gas pressure has been set at 2 Torr, and has been maintained higher than this.

The problem of the present invention is to break the conventional wisdom and increase the sealed gas pressure to 2 T.
It is an object of the present invention to provide a fluorescent lamp which is bright as less than orr, has no early blackening or flickering of light, and is particularly suitable for operation at a high tube wall load of 500 W/new or more.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a fluorescent lamp with a high tube wall load that improves brightness, prevents light flickering, and reduces blackening. The main electrode and auxiliary anode consisting of a coil are sealed, and a starting gas consisting of 90% or more argon and the remainder neon is added to the bulb.
, sealed at a pressure of 7 Torr or more and 2.0 Torr or less5
The above problem was solved by operating with a tube wall load of 00 W/rrf or more.

(Function) Luminous efficiency is improved by lowering the charging pressure of the starting gas, and the increase in ion bombardment caused by lowering the charging pressure is reduced by blending neon with a small specific gravity with argon as the starting gas. In order to easily increase the load and reduce anode vibration, the electrode is configured with a triple coil, and the flickering of brightness that occurs due to the increase in electrode load and the reduction of the sealing pressure is reduced by installing an auxiliary anode, which reduces ion bombardment and anode vibration. This is to further reduce and solve the problem. Thus, the present invention appropriately integrates the above elements,
By combining the two, the above-mentioned problems are solved, and the drawbacks associated therewith are not caused. Furthermore, a fluorescent lamp constructed in this way has the advantage that it can be operated with a high tube wall load and a particularly bright effect is obtained, and the disadvantages caused by this are hardly noticeable.

(Example) The details of the invention will be explained by means of illustrated embodiments.

(1) is a straight glass bulb, ■ is a fluorescent film formed on the inner surface of this bulb ■, ■, ■ is a stem with both ends of the bulb (D closed), (a), (b)... are this Stem■,■
A pair of inner conducting wires are introduced into the valve (1) through the .
...The main electrode installed between (b), ■... is the inner conductor wire (a).

Auxiliary anodes are provided at each of the main electrodes 0 and 0 and protrude in front of the main electrodes 0 and 0, and auxiliary anodes are provided at both ends of the bulb ■ and connected to the inner conductor wires), ni)... This is a pair of caps that are connected. Then, as a starting gas, a rare gas consisting of 90% by volume or more of argon and the remainder neon, and an appropriate amount of mercury or amalgam are sealed in the valve ω.

The above main electrode (■) is made by placing a mandrill along one layer of tungsten wire for current-carrying, and winding a thin tungsten wire around this to form a single layer coil, and then winding this secondary coil around a secondary mandrel to form a triple coil. A triple coil filament made by cutting, annealing, and then dissolving and removing both mandrils is installed between the inner conductors (A) and (A), and an electron radioactive material made of an alkaline earth metal oxide is attached to this triple coil filament. It becomes covered with.

The above-mentioned auxiliary anode 0 is formed by forming a wire made of a high-melting point metal such as a tungsten wire or a molybdenum wire into a nearly L-shape, and conductively fixing it to the inner conductor wire (A), with its tip protruding forward from the main electrode 0. In this example, for each main electrode 0, 2
There are several.

Next, the operation of the fluorescent lamp of this embodiment will be explained. The fluorescent lamp of this embodiment has a tube wall load of, for example, 810 W/rr.
It is specified to operate at l'. Now, when starting and discharging between the main electrodes (c) and 0, the main electrodes 0, 0 will bear all the electron emission, and the ion inflow will be carried out by the auxiliary anodes 0, 0...
* is the main electrode, and main electrodes 0 and 0 are the subordinate electrodes. As a result, the impact accompanying the influx of ions into the main electrode (2) becomes smaller, the anode spot becomes smaller, sputtering is reduced, and anode vibration is almost eliminated. As a result, flickering in brightness was almost no longer perceptible, and darkening of the tube wall was drastically reduced. In addition, the fluorescent lamp of this example had a small filler gas pressure of 1.7 to 2.0 Torr, so the luminous efficiency increased and it became brighter, but on the other hand, the ion bombardment was supposed to be large, but the starting gas The addition of a small amount of neon to the argon and the provision of an auxiliary anode reduced ion bombardment, which also reduced brightness flickering and tube wall blackening.

In this way, the fluorescent lamp of this example enjoys the expected increase in brightness resulting from lowering the filler gas pressure and increasing the load on the tube wall. Most of these problems could be avoided by adding neon to the starting gas and providing an auxiliary anode.

In addition, for pipe wall loads of less than 500 W/m,
The brightness does not change much when argon is around 90% by volume. Similarly, when the gas pressure is less than 500 W/rrF, the brightness and blackening do not change much within the range of 1.7 to 2.0 Torr. That is, the tube wall load is 500W/n
It was found that at temperatures above -F, the argon volume ratio and the sealed gas pressure have a critical effect on brightness and blackening.

Next, the fluorescent lamp of this embodiment is subjected to the above-mentioned tube wall load 807.
When lit at 1W/nf and when pure argon is filled at 2.4 Torr without a conventional auxiliary anode, the normal tube wall load is 7.
The travel characteristics were compared with the case of lighting at 3.6 W/n (H).The results are shown in Figure 2.
It is taken in units of r, and the vertical axis shows the total luminous flux as a relative value common to both. As is clear from this figure, the total luminous flux value of this example is much larger than that of the conventional example in the range from 0 to 1000 hours, and is not inferior to the conventional example even after 1000 hours.

Next, the composition and pressure of the starting gas sealed in the fluorescent lamp of this example were varied to investigate the blackening state, and the results were compared with the above-mentioned conventional example.

For evaluation of blackening, a score of 10 is given for no blackening at all, and a score of 1 is given for a case where there is severe blackening all around the end of the lamp tube.
points, and the points between them were evaluated on a 10-point scale based on visual perception. The results are shown in the layer table.

(Left below) Note. ■ AS in the table stands for anode spot ■ EB in the table
is an abbreviation for end band ■ M in the table is an abbreviation for the end of the lamp on the mark side ■ NM in the table
stands for the unmarked end of the lamp (c) Fluorescent lamps have a lamp mark engraved on only one end of the bulb, so when specifying one end of the tube, expressions such as ■, Q) are used. do.

As is clear from this table, the sealed gas pressure is 1.8 Torr.
The blackening state of all the products of r is better than that of the conventional example, and 2.
The value of 2 Torr is comparable to that of 1 and 8 Torr. On the other hand, in all cases where the filled gas pressure was 1 or 2 Torr, the blackening state was worse than in the conventional case. Further, the argon content was preferably in the range of 90 to 100% by volume.

In addition, in the subsequent experiment, the sealed gas pressure was 2.2T.
The one with orr was inferior in brightness than the one with 1.8 Torr. Furthermore, all of the samples with numbers 1 to 9 had no flicker of light. This is thought to be because all of the above-mentioned samples 1 to 9 adopted a triple coil as the main electrode and were provided with an auxiliary anode. Due to the structure of the triple coil, the anode vibration stops, but this stop state is temporary, and the auxiliary anode prevents fluctuations in the lamp discharge current during the transition period when the anode vibration occurs, and as a result, flickering is almost completely prevented. I think it was done.

For these reasons, the fluorescent lamp of this example is bright and
There is no flickering of light, and even if the light is turned on for a long time, the blackening is at the same level as before, so the same level of lifespan can be obtained.

In addition, in the present invention, the starting gas contains 90% by volume or more of argon (including pure argon) and the sealed pressure is 1.7.
-2.0 Torr has all the above-mentioned effects.

In other words, experimental results show that if the argon content is less than 90% by volume, only the same level of brightness as before can be obtained, and if it is less than 1 or 7 Torr, the luminous flux maintenance rate decreases, and if it exceeds 2.0 Torr, only the same level of brightness as before can be obtained. I understood from.

Further, for tube wall loads of less than 500 W/r&, the brightness does not change much when argon is around 90% by volume. Similarly, at 500 W/m, the filled gas pressure is 1.7
Brightness and blackening do not change much within and outside the range of ~2.0 Torr. That is, it was found that at tube wall loads of 500 W/rrr or more, the argon capacity ratio and the sealed gas pressure have a critical effect on brightness and blackening.

Further, the auxiliary anode is not limited to the rod shape shown in the figure, but may be a plate, a wire mesh, or the like, and the auxiliary anode may also have a shielding effect. If a suitable amalgam is used as the mercury source, the high mercury vapor pressure caused by the high tube wall load can be suppressed and high efficiency can be maintained.

Further, in the present invention, the shape of the valve is not limited to the above-mentioned example, and other shapes such as an annular shape, a U-shape, and an M-shape are also applicable.

〔Effect of the invention〕

As described above, the fluorescent lamp of the present invention has a main electrode and an auxiliary anode made up of triple coils sealed, and a starting gas consisting of 90% by volume or more of argon and the remainder of neon is supplied into the bulb at a pressure of 1.7 to 2.0 Torr. Since the tube wall is sealed with 500 W/m or more and operated with a tube wall load of 500 W/m or more, it is bright, has almost no light flickering, and has a long life with little blackening of the tube wall.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the fluorescent lamp of the present invention, and FIG.
The figure is also a graph explaining the effect. (υ...Bulb ■...Fluorescent film■...
Stem (A)...Inner conductor ■...Main electrode 0...Auxiliary anode = 12-

Claims (1)

[Claims] (1) A main electrode and an auxiliary anode consisting of a triple coil are sealed at both ends of a glass bulb, and a starting gas consisting of 90% by volume or more of argon and the remainder of neon is supplied into the bulb at a temperature of 1.7 Torr or more and 2.0 Torr or less. A fluorescent lamp characterized in that it is sealed under pressure and operates with a tube wall load of 500 W/m^2 or more.