JPS59201363A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a bulb type fluorescent lamp with good luminous flux maintability ratio after it lights for a long time by preventing the reduction of initial luminous flux. CONSTITUTION:The reduction of initial luminus flux is improved by providing a coat 5 made of metal oxide or phosphate with a thickness of 1.0mum or more between the inner surface of the inner tube 3 of a bulb type fluorescent lamp and preventing a mercury ion from arriving at the inner surface of the inner tube and the inner tube from being colored. As a result, the bulb type fluorescent lamp whose deterioration rate after it lights for 100hr is better than at least a general flurorescent lamp and whose luminous flux maintability ratio after it lights for 1,000hr is high can be obtained. In addition, as the metal oxide, each oxide of Al, Ti, Si, Mg, Zr, or B is excellent and as the phosphate Ca2P2O7 shows a particular excellent effect.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is an improvement to a fluorescent lamp having an open inner tube.

It is about good.

[Background of the invention]

two electrodes provided on the stem; one end surrounding each one of the electrodes 1- and hermetically sealed to the stem;

The other curved end opens near the sealing part and has an inner surface.

A pair of glass inner tubes coated with a phosphor film.

A pair of inner tubes were covered and hermetically sealed to the stem.

A fluorescent lamp (hereinafter referred to as a spherical fluorescent lamp) is equipped with a glass outer tube and a rare gas and mercury are sealed in the outer tube.

Conventionally, the initial luminous flux was slightly worse than the theoretical value, and the luminous flux.

The disadvantage is that the maintenance rate is lower than that of regular fluorescent lamps.

There was a point. Luminous fibers formed by lighting for several thousand hours.

As a result of examining a light bulb-type fluorescent lamp with a degraded special vehicle, it was found that the deterioration state of the phosphor film was similar to that of a general fluorescent lamp, so there was no problem, but the inner surface of the inner tube glass was colored black. The luminous flux maintenance rate has decreased significantly.

There was found. This coloring of the inner tube glass was noticeable near the opening, and it was hardly improved even if the glass material IO quality was changed within the range of soft glass.

An ion microprobe was used to investigate the cause of the blackening of the inner surface of lath.

As a result of examining it with an analyzer, it was found that the glass was blackened.

Accordingly, mercury was detected in the glass. Mercury atom.

Since it is impossible for mercury to directly enter the interior of the glass, it is thought that the mercury ions that have passed through the phosphor film first enter the surface of the glass, diffuse into the interior of the glass, and color the glass. In the above-mentioned light bulb type fluorescent lamp, significantly more mercury ions penetrate into the glass than in a general fluorescent lamp, and this is thought to be due to the following reasons. That is, in a self-ballasted fluorescent lamp, when the lamp is lit, the openings of a pair of inner tubes are connected by discharge plasma, and a portion of this plasma is diffused throughout the outer tube. Electron diffusion rate.

Since the diffusion speed of positive ions is significantly greater than that of positive ions, there are more electrons than positive ions on the outside of the inner tube.

The outside of the inner tube has a negative potential compared to the plasma inside the inner tube. Therefore, mercury ions, which are positive ions in the plasma inside the inner tube, are distributed around the outer circumference of the inner tube.

li1 of the inner tube passes through the phosphor membrane.
The number of mercury ions reaching the inner surface is significantly higher than in a typical fluorescent lamp without an open inner tube.

It becomes. Furthermore, in a light bulb type fluorescent lamp, the inside of the outer bulb is small.

Plano is filled with a few torr of rare gas.

It is difficult for the heat generated by the heat to escape from the inner tube, and the temperature of the inner tube reaches over 100 degrees Celsius, which then flows into the glass interior of the inner tube.

The diffusion of mercury ions is promoted.

As mentioned above, in a compact fluorescent lamp, the number of mercury ions reaching the inner tube and inner surface is significantly large.

It is thought that because the temperature of the inner tube is high and the mercury ions mentioned above easily enter the 1.3.degree. area of the glass tube, the inner surface of the inner glass tube becomes black.

[Purpose of the invention]

An object of the present invention is to obtain a light bulb-shaped fluorescent lamp that prevents a decrease in initial luminous flux and has a good luminous flux maintenance rate after being turned on for a long time.

[Summary of the invention]

In order to achieve the above object, the fluorescent lamp according to the present invention has a film thickness of 1.0 μm or more between the inner surface of the glass tube of the inner tube of the self-ballasted fluorescent lamp and the phosphor film. A metal oxide or phosphate coating is provided.

Mercury ions reach the inner surface of the glass tube of the inner tube.

It prevents coloring of the inner tube by blocking the initial luminous flux and long-lasting light.

The aim is to improve the luminous flux maintenance rate between the two.

ruol) [Embodiments of the invention] Next, embodiments of the present invention will be described with reference to the drawings. .

FIG. 1 shows one implementation of a self-ballasted fluorescent lamp according to the present invention.

FIG. 2 is a partially cutaway sectional view of the example described above.

Metal oxide or phosphate coating provided on the inner tube of 11
4. Figure 3 shows the relationship between film thickness and relative initial luminous flux. Figure 4 shows the relationship between film thickness and relative deterioration rate. Figure 4 shows the relationship between film thickness and relative luminous flux maintenance rate. FIG. 5 is a diagram showing the distribution of the thickness of the coating in the inner tube of the example. The self-ballasted fluorescent lamp of the example shown in FIG. Two electrodes 2 provided on a stem 1, and one end of which is one of the electrodes 2 mentioned above.

a pair of glass inner tubes 6 which are hermetically sealed to the stem 1 surrounding the inner tubes 6 and whose curved other ends open near the sealed portion; (Equipped with a hermetically sealed glass outer tube 4, and the stem side of the outer tube 4 is usually equipped with a screw-in bulb cap or cap pin.

(none shown) to make electrical connections.

It is used to hold the fluorescent lamp. The inner tube above.

On the inner surface of the glass tube 6 is provided a coating 5 of metal oxide, -substance or phosphate along the inner surface of the glass tube.

A phosphor film 6 is deposited thereon. Also inside the outer tube 4.

is filled with trace amounts of rare gas and mercury. The above electricity.

The discharge of the spherical fluorescent lamp starts from one electrode 2.

It passes through the inner tube 6, temporarily spreads into the outer tube 4 from the opening of the inner tube filter, and then enters the other inner tube again and is led to the electrode.

A discharge is formed. In this example, the diameter of the outer tube.

9Qmm, height 95mm, inner tube outer diameter 14mm, length
.

Using a 125 mm bulb-shaped fluorescent lamp, lamps were manufactured in which a film of Al2O3 was applied as the metal oxide and the film thickness was varied by 5.

The relationship between Al2O3 film thickness and initial luminous flux is expressed as relative initial luminous flux.

Figure 2 shows the values. Without the Al2O3 coating, the initial luminous flux decreases from the initial stage of lighting due to coloring of the inner tube, causing AI! 203 coating thickness is 5H1μ
When it exceeds about m, the initial luminous flux is almost equal to the theoretical value.

is obtained, and the upper limit of the thickness of the film is about 40 μm.

It is. When the thickness of the coating exceeds 40ttm, the above coating is applied.

The absorption of light increases and, conversely, the initial luminous flux decreases. .

Figure 3 shows the deterioration rate after 100 hours of lighting, with the film thickness 1-
Relative deterioration rate based on the case where is 1.0 μm.

FIG. The thickness of A1206 coating is approximately 1.0 μm
.

Since it shows a deterioration rate equivalent to that of a general fluorescent lamp, by further increasing the film thickness, a deterioration rate superior to that of a general fluorescent lamp can be obtained, and when the film thickness becomes about 5.0 μm or more, the deterioration rate varies. It also disappears and becomes stable.

Figure 4 shows the luminous flux maintenance factor as a function of film thickness after 1000 hours of lighting.

The state that changes with increase is shown by relative luminous flux maintenance rate.

However, the film thickness of Al2O3 is as shown in the figure.

When the diameter is about 7.0 μm or more, the luminous flux maintenance factor reaches its upper limit and there is no variation.

In the fluorescent lamp according to the present invention, mercury ions have a particle size.

Although it passes between fluorescent particles of several micrometers, it is difficult to pass through the densely structured metal oxide or phosphate film layer, and metal oxides and phosphates are chemically and thermally sensitive. The coating of these materials is also stable.

The above is carried out because the inner surface of the inner tube is covered with a membrane.

In the example, Al2O3 was described, but other materials may be used as long as they are metal oxides or phosphates.If you take into consideration the fact that they absorb less visible light and are easy to adhere to glass, it is possible to use Al2O3 as a metal oxide. A7. Ti, Si, Mg, Zr, and B oxides are excellent, and as a phosphate, Ca2P2O
No. 7 showed particularly excellent effects. Above.

The relationships between film thickness, initial luminous flux, deterioration rate, and luminous flux maintenance rate in light bulb-shaped fluorescent lamps using the various materials listed below are similar to those obtained when Al2O3 is used. Indicated.

As shown above, there is metal oxide deposited on the inner surface of the inner tube.

The thickness of the phosphate coating is less than 1.0 μm.

In spherical fluorescent lamps, the luminous flux deterioration after 100 hours of lighting is greater than that of general fluorescent lamps, and at the 1000 hour point.

The luminous flux of punching is greatly reduced. The thickness of the above coating is.

At 1.0 μm, the luminous flux deterioration rate is the same as that of a general fluorescent lamp, and when it exceeds 1.0 μm, the deterioration rate of a bulb-shaped fluorescent lamp is superior to that of a general fluorescent lamp, and furthermore, when the film thickness is 10.
At 0 μm or more, there is no variation in the deterioration rate.

The initial luminous flux is stable and almost in line with the theoretical value.

The luminous flux maintenance rate after 1000 hours of lighting was also significantly improved.

Ru. When the thickness of the coating becomes 7.0 μm or more, the initial light flux reaches its theoretical maximum value, and the deterioration rate approaches a minimum value of about 1°, and the luminous flux maintenance rate reaches its maximum value. In addition.

Metal oxide or phosphate coating on the inner surface of the inner tube.

The inner tube is curved so that it can be coated with a uniform film thickness.

This is the thinnest part of the film, although it is technically difficult.

If it exceeds about 50 μm, the film thickness will be 1
゜It was observed that the film came off.

Based on the results described above, a light bulb-shaped fluorescent lamp having the same dimensions as in the previous example was used, and a coating of Al2O3 with a particle size of 0.02 .mu.m or less was used as the metal oxide.

A light bulb-shaped fluorescent lamp was manufactured by providing the film on the inner surface of the inner tube so that the film thickness was about 10 μm at the thinnest part.

In this example, the film thickness is distributed as shown in FIG.

A film was formed. As a result of measuring the above-mentioned light bulb type fluorescent lamp, the initial luminous flux was 8001m, the deterioration rate after 100 hours of lighting was 6.5cm, and the luminous flux maintenance rate after 1000 hours of lighting was 92:(
1 piece was obtained. On the other hand, provide a coating of A, 1203.

In a conventional bulb-shaped fluorescent lamp, the initial luminous flux is 7801 m,
.

Deterioration rate after 100 hours of lighting: 15%, 1000 hours of lighting
.

The light bulb according to this example has a luminous flux maintenance rate of 65%.

The shaped fluorescent lamp satisfies the theoretical value of initial luminous flux of 8001 m,
-Deterioration rate after 100 hours of lighting and 1000 hours of lighting.

The subsequent luminous flux maintenance rate could be significantly improved.

〔Effect of the invention〕

As mentioned above, the fluorescent lamp according to the present invention uses metal oxide or phosphorus having a film thickness of 1.0 μm or more between the inner tube inner surface of the self-ballasted fluorescent lamp and the phosphor film.

A salt coating is provided to prevent mercury ions from reaching the inner surface of the inner tube and coloring the inner tube, which improves the decrease in the initial luminous flux and reduces the rate of deterioration after 100 hours of lighting.

A light bulb-shaped fluorescent lamp which is at least equal to or less than 2 general fluorescent lamps and which has a high punching retention rate after being lit for 1000 hours and 5 hours.

Obtainable.

[Brief explanation of drawings]

FIG. 1 shows a portion of a self-ballasted fluorescent lamp according to the present invention. FIG. 2, a partially cutaway sectional view of the embodiment, shows the metal oxide or phosphoric acid provided on the inner surface of the inner tube of the tenth embodiment. A diagram showing the relationship between the thickness of the salt film and the relative initial luminous flux. Figure 6 shows the relationship between the thickness of the coating and the relative deterioration rate. The figure shown in FIG. 4 shows the thickness of the coating and relative luminous flux maintenance. Figure 5 is a diagram showing the relationship between the ratio and the -2
It is a figure showing the distribution state of the thickness of the above-mentioned film. . 1... Stem 2... Electrode 6... Inner tube 4... Outer tube 5... Metal oxide or phosphate coating. Representative patent attorney Junnosuke Nakamura, 7. ) ・1t Figure 1

Claims (4)

[Claims] (1) Two electrodes are provided on the stem, and one end is hermetically sealed to the stem surrounding each one of the above electrodes. a pair of glass inner tubes, the other end of which is curved and opens near the sealed portion, and whose inner surface is coated with a phosphor film;
A fluorescent lamp comprising an outer tube covering a pair of inner tubes and hermetically sealed to the stem, the outer tube having a rare gas and mercury sealed therein, wherein the inner tube inner surface and the fluorescent lamp are in contact with each other. A fluorescent lamp characterized in that a metal oxide or sinate coating is provided with a thickness of 1.0 μm or more between the lamp and the lamp. (2) The thickness of the metal oxide phosphate coating is 5
．． A fluorescent lamp according to claim 1, characterized in that the diameter is 0 μm or more. (3) The metal oxide or phosphate coating has a thickness of 7
．． A fluorescent lamp according to claim 1, characterized in that the diameter is 0 μm or more. (4) The thickness of the metal oxide or phosphate coating is 50 μm at the farthest point from the open end of the inner tube. A fluorescent lamp according to claims 1 to 6, characterized in that: (5) The above metal oxides are kl, Ti, Si, Mg,
Oxidation of any one selected from the oxides of Zr and 'B. 5. The fluorescent lamp according to claim 1, wherein the phosphate is Ca 2 P 207.