JPS61253761A - Rapid-start fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent any reduction of the luminous flux of a rapid-start fluorescent lamp and reduce its firing potential by applying a phosphor paint, prepared by adding a three-wavelength-type phosphor and a specific adherence-increasing agent to an aqueous solution of a water-soluble binder, to the transparent conductive film prior to drying the applied paint to form a phosphor layer. CONSTITUTION:A three-wavelength-type phosphor and an adhesive increasing agent which is composed of at least one of barium nitrate and strontium nitrate, at least one of boric acid and boric anhydride and the chloride of an alkaline earth metal are added to an aqueous solution of a water-soluble binder to prepare a phosphor paint. The thus prepared phosphor paint is applied to the transparent conductive film prior to drying the applied paint to form a phosphor layer, thereby producing a rapid start fluorescent lamp. In order to reduce the firing potential of the fluorescent lamp, it is possible to form the phosphor layer by forming a gamma-alumina film on a transparent conductive film and then applying the above phosphor paint composition to the gamma-alumina film prior to drying the applied paint.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rapid-start type fluorescent lamp using a so-called three-wavelength type phosphor that improves color rendering without impairing lamp efficiency, and particularly relates to a rapid-start type fluorescent lamp using a so-called three-wavelength type phosphor that improves color rendering without impairing lamp efficiency. The present invention relates to a rapid-start type fluorescent lamp that has improved adhesive strength with a phosphor layer and improved starting characteristics.

[Background of the invention]

Conventionally, when attaching a phosphor to the inner surface of a glass tube for a fluorescent lamp, 1. For example, the phosphor is suspended in a solution of nitrocellulose as a binder dissolved in butyl acetate, an organic solvent. 1. Water-soluble binders have been used due to problems such as work environment.

Generally, this water-soluble binder has the disadvantage that the adhesive strength of the phosphor layer to the glass tube is weaker than that of conventional organic solvent binders.

In particular, when the water-soluble binder is polyethylene oxide, the adhesive strength of the phosphor layer to the glass tube is extremely weak and the phosphor layer peels off from the glass tube. As shown in Japanese Patent No. 126658, at least one of strontium nitrate and barium nitrate and at least one of boric acid, boric boric acid and calcium birophosphate can be added to the phosphor paint as adhesive strength increasing agents. Proposed.

However, when a phosphor layer is formed on the inner surface of a glass tube for a rapid start type fluorescent lamp in which a transparent conductive coating such as tin oxide is provided on the inner surface of the glass tube, the above-mentioned peeling phenomenon becomes even more pronounced.

In this case, by increasing the amount of the adhesive strength increasing agent added, the adhesive strength of the phosphor layer to the glass tube is improved, but the discharge starting voltage of the fluorescent lamp increases and the lamp luminous flux increases. It was also confirmed that the

In particular, in a power-saving rapid-start type fluorescent lamp in which the enclosed rare gas is a mixed gas containing krypton, for example, a mixed gas of krypton and neon, the discharge starting voltage of the fluorescent lamp is further increased.

In addition, so-called three-wavelength, energy-saving, rapid-start type fluorescent lamps, which are characterized by high efficiency and high color rendering properties, have even higher discharge starting voltages and cannot be put to practical use.

[Purpose of the invention]

An object of the present invention is to provide a rapid start type fluorescent lamp in which a transparent conductive coating is formed on the inner surface of a glass tube, and a three-wavelength phosphor layer is provided on the transparent conductive coating. It is an object of the present invention to provide a rapid start type fluorescent lamp which can strengthen the adhesive strength of the body layer, prevent a decrease in lamp luminous flux, and reduce the discharge starting voltage of the fluorescent lamp.

[Summary of the invention]

In order to achieve the above object, the present invention includes a three-wavelength phosphor, at least one of barium nitrate and strontium nitrate, and at least one of boric acid and boric anhydride in a water-soluble binder aqueous solution. A phosphor paint containing an adhesive strength enhancer consisting of an alkaline earth metal chloride was applied onto the transparent conductive film, and dried to form a phosphor layer to form a rapid-start type fluorescent lamp. It is characterized by

In addition to the above structure, in order to lower the discharge starting voltage of the fluorescent lamp, a transparent conductive coating is used.

It is also possible to provide a phosphor layer by providing a γ-alumina coating, applying the above-mentioned phosphor coating composition thereon, and drying it.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail by way of examples.

EXAMPLE 0.0% of polyethylene oxide as a water-soluble binder.
An 8% by weight aqueous solution is used. To 150 cc of this polyethylene oxide aqueous solution, 37 g of a blue-emitting phosphor and a predetermined amount of a red-emitting phosphor (Y g E u )zOs are added. Thereafter, this solution is ball milled for 30 minutes to prepare a phosphor suspension.

This suspension was applied to the inner surface of a glass tube for rapid start type fluorescent lamps (for 40W), which had a transparent conductive coating of tin oxide on the inner surface of the glass tube, and a coating of γ-alumina on top of that. do. The glass tube is then dried and fired under normal conditions.

After that, after going through the normal fluorescent lamp manufacturing process,
A power-saving rapid-start type fluorescent lamp was manufactured in which the filled gas was krypton:neon=65:35% by volume.

Table 1 shows the adhesive strength and lamp luminous flux (100
h) and the discharge starting voltage. here,
The adhesive strength of the phosphor layer in Table 1 is defined as follows. In other words, as a measure of the strength of the adhesion of the phosphor layer to the inner surface of the glass tube, the degree of peeling of the phosphor layer that occurs when an impact is applied to the outer surface of the phosphor lamp with a piano wire with a load equivalent to 150 g is measured. The size is expressed by the average diameter (■φ). Further, the amount of the adhesive strength increasing agent added is expressed in weight % with respect to the phosphor.

In Table 1, &1 to 3, 8 and 11 are fluorescent lamps of conventional construction shown for comparison with this embodiment.

&1 is the case where no adhesive strength increasing agent is added, and the adhesive strength of this θ i fluorescent lamp is extremely weak and cannot be put to practical use. &2 has no problem with discharge starting voltage, but has a problem with weak adhesive strength. In addition, &3 has a large amount of B a (No, ) and B2O3 added, and although there is no problem with adhesive strength in this case, it can be seen that the discharge starting voltage is not suitable for practical use.

&4 to &7 and NQ9, 10 in this example, B a
(Now) z-Bias and 5rCj1. It has been confirmed that, with various combinations of the amounts added, fluorescent lamps which can be used in practical use can be obtained without any problems in the adhesive strength of the phosphor layer, the lamp luminous flux, and the discharge starting voltage.

In addition, in Example 7, B a (N On) s 0
, 3% by weight, Bias O-2% by weight and S rcf
i=o,a% by weight, but in this case, lamp lighting (
After 100 hours), the color shift of the lamp color became large, and the lamp luminous flux also decreased significantly. On the other hand, when only B2O3 was increased to 0.4% by weight in &8 shown as a comparative example of this example, the above-mentioned color shift did not occur, but the discharge starting voltage increased.

In addition, in blood 11, the amount of B a (No,) added is 0.7
% by weight, and in this case, the lamp luminous flux decreases significantly.

The above examples have been shown for the combination of B a (NOx) tp Btus and Sr(,Q), but B a
Almost the same effect can be obtained by using S r (No3) or B a (NO3) z and 5r(NOl)8 instead of (No, ). Also, B20. Instead of H, B O, or B20. Almost the same effect can be obtained by using H, BO, and H. Also, instead of 5rC11, other alkaline earth metal chlorides, such as BaCΩ2
Almost the same effect can be obtained by using .

In addition, when experiments were conducted in which the addition rate of the adhesive strength increasing agent was varied, the following was found.

That is, B a (NOs) s and S r (N
The amount of Oa)s added is preferably in the range of 0.05 to 0.5% by weight.The reason is that if the addition rate is less than 0.05% by weight, the adhesive strength of the phosphor layer will be weak. If it exceeds this, the lamp luminous flux tends to decrease and the discharge starting voltage increases. In addition, it is desirable that the amount of B, 03 and H, BO added be in the range of 0.05 to 0.3% by weight.The reason is that if the addition rate is less than 0.05% by weight, the adhesive strength will be weak; If it exceeds % by weight, the discharge starting voltage will increase.

Furthermore, the amount of alkaline earth metal chloride, such as 5rC1 or BaCR, desirably ranges from 0.05 to 0.3 weight percent, because the addition rate is 0.05% by weight.
If it is less than 0.03% by weight, the adhesive strength will be weak, and if it exceeds 0.03% by weight, the luminous flux of the lamp will decrease significantly after the lamp is turned on.

In addition, in &7 and 8 in Table 1, it has been confirmed through several experiments that depending on the amount of B and O added, in the case of &7, the lamp color tone will shift after 100 hours of lighting and the lamp luminous flux will decrease significantly. has been done. Therefore, B,
Careful consideration is required in determining the amount of O or H*B Os to be added and the amount of alkaline earth metal chloride 1, such as SrCj1m or BaCQt. However, this phenomenon does not occur in the halophosphate phosphor of this example.
It has been confirmed that there is no problem with the lamp luminous flux even with the addition specification of adhesive strength increasing agent No. 7.

In this embodiment, a power-saving rapid-start type fluorescent lamp is shown, but other rapid-start type fluorescent lamps can also produce similar effects.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a rapid-start type fluorescent lamp in which the adhesive strength of the phosphor layer to the glass tube is improved without reducing the lamp luminous flux, and the discharge starting voltage is low. This greatly contributes to improvement.

Claims (1)

[Claims] 1. A transparent conductive coating is formed on the inner surface of a glass tube, and a three-wavelength phosphor, barium nitrate, and strontium nitrate are added to the transparent conductive coating in an aqueous solution of a water-soluble binder. A phosphor layer is provided by applying and drying a phosphor paint containing at least one of boric acid and boric anhydride, and an adhesive strength increasing agent consisting of an alkaline earth metal chloride. A rapid-start type fluorescent lamp that is characterized by 2. The addition ratio of the adhesive strength increasing agent to the phosphor is 0.05 barium nitrate or strontium nitrate.
-0.5% by weight of boric acid or boric anhydride, and 0.05-0.3% by weight of alkaline earth metal chlorides. %. 3. The rapid start type fluorescent lamp according to item 1 or 2, wherein the alkaline earth metal chloride is at least one of strontium chloride and barium chloride.