JPH0447659A - Sputter prevented green fluorescent lamp - Google Patents

Abstract

PURPOSE:To suppress the cost to a great extent by coating the outside surface of a glass tube with a green highpolymer resin consisting of an admixture of green pigment and sputter preventive highpolymer resin, and coating the inner surface of the glass tube with a phosphor having the light emission peak in a certain wavelength. CONSTITUTION:The outside surface of a glass tube is coated with a green highpolymer resin consisting of an admixture of green pigment and sputter preventive highpolymer resin, while the inner surface of the glass tube is coated with a phosphor having the light emission peak in 510-550nm. A 20-watt fluorescent lamp in the form of straight tube held horizontally is immersed, for example, in a mixtuer liquid of 980-g polyurethane aqueous dispersion body and aqueous dispersion liquid of 20-g green organic pigment, and this is dried by a 5m/sec warm wind at 150 deg.C to form a 100-mum thick green film consisting of polyurethane resin over the outside surface of the glass tube. The phosphor applied to the inner surface is green emitting and, for ex.., consisting in a phosphor of Zn silicate activated with Mn. Marcury or rare gas is encapsulated in the inside.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a novel shatterproof green fluorescent lamp.

Conventional technology Conventionally, in green fluorescent lamps, a green pigment is formed and baked on the inner surface of a glass tube, and then a 51°0 to 55°
It uses a two-layer structure with a phosphor film that emits broadband light with a peak at 0 nm.

By the way, since fluorescent lamps use glass tubes, if the glass tubes are damaged due to incorrect handling, glass pieces may fly off and cause personal injury. As a method for dealing with this problem, a shatterproof type fluorescent lamp is known in which the outer surface of a glass tube is covered with a transparent tube made of a polymer resin such as polyester resin. This is a method in which a glass tube is covered with a heat-shrinkable polyester resin tube, and then the tube is heat-treated to form a polymer resin coating on the outer surface of the glass tube.

Problems to be Solved by the Invention As mentioned above, conventional green fluorescent lamps employ a two-layer structure in which a green pigment and a broadband luminescent phosphor film are sequentially formed on the inner surface of a glass tube. The green pigment deteriorates significantly due to mercury, ultraviolet rays, and heat.
There was a problem that the luminous flux and luminous flux maintenance rate were significantly reduced.

On the other hand, in the anti-scattering type fluorescent lamp, a tube made of polyester resin is used as described above in consideration of weather resistance, film strength, etc.

However, this tube is extremely expensive due to the difficulty of processing it, and it also involves an extremely difficult process of manually covering the fluorescent lamp. Therefore, there is a problem in that the anti-scattering fluorescent lamp is much more expensive than a general fluorescent lamp.

The present invention has been made in consideration of these problems, and it is easy to form a green coating on glass tubes to prevent scattering.
Moreover, it is possible to mass-produce the intermembrane stably and smoothly.
An object of the present invention is to provide a shatterproof green fluorescent lamp whose cost can be significantly reduced compared to conventional ones.

Means for Solving the Problems In order to achieve this object, the shatterproof green fluorescent lamp of the present invention includes a green polymeric resin consisting of a mixture of a green pigment and a shatterproof polymeric resin on the outer surface of the glass tube. coated,
Further, the glass tube has a structure in which a phosphor having an emission peak at 51,0 to 550 nm is coated on the inner surface of the glass tube.

According to the above-mentioned structure, it is possible to efficiently and quickly form a large amount of a green coating and a scattering prevention coating on the outer surface of a glass tube.

Example Examples of the present invention will be described below.

Example 1 A well-stirred mixture of 980 polyurethane aqueous dispersion (Superflex 1107, manufactured by Dai-Kogyo Seiyaku Co., Ltd.) and 20 g of an aqueous dispersion of a green organic pigment (SP Green 7000, manufactured by Fuji Shiki Co., Ltd.) was placed horizontally. After immersing the straight tube type 20 watt fluorescent lamp, it was heated to 1506C.
By drying with hot air at 5 m/sec, the outer surface of the crow pipe is coated with water. / Thickness made of resin] -00
Forms a micron green film.

Example 2 Water-dispersed polymeric polyester (manufactured by Toyobo Co., Ltd. +MD-1) was used instead of the polyurethane water dispersion of Example 1-.
A 100 micron thick green film made of polyester resin was formed on the outer surface of the glass tube using the same method as in Example 17.

Example 3 Organic solvent-soluble polyester polyol-based urethane (
Burnock D64.39)98 manufactured by Inu Nippon Inc.
A straight tube type 20 watt fluorescent lamp held horizontally was immersed in a well-stirred mixture of 5 g of green inorganic pigment (zinc cobaltate) and 15 g of green inorganic pigment (zinc cobaltate), and then heated to 150°C;
It is dried with warm air at sec to form a 100 micron thick green film made of urethane resin on the outer surface of the glass tube.

Example 4 A thermoplastic saturated polyester (Vylon 200 manufactured by Toyobo Co., Ltd.) was used instead of the organic solvent-soluble polyester polyol-based urethane of Example 3.
A green coating of polyester resin with a thickness of 1 to 00 microns is formed on the outer surface of the glass tube in the same manner as in the case of .

Example 5 In place of the organic solvent-soluble polyester polyol-based urethane of Example 3, a rubber-based oxime-type urethane (
Using YF3505 (manufactured by Toshiba Silicone Corporation), a 100 micron thick green film made of silicone resin was formed on the outer surface of the glass tube in the same manner as in Example 3.

Example 6 Glass was formed in the same manner as in Example 3, using rubber-based release silicone (manufactured by Toshiba Silicone Corporation, YSR3022) instead of the organic solvent-soluble polyester polyol-based urethane of Example 3. A 100 micron thick green film made of silicone resin is formed on the outer surface of the tube.

In the straight tube type 20 watt fluorescent lamp in each of the examples, a green fluorescent material having a luminescence peak at 510 to 550 I]m, such as a green fluorescent material made of a manganese-activated zinc silicate phosphor, was used on the inner surface of the glass tube. A body membrane is formed,
Also, mercury and rare gas are sealed inside.

The results of measuring the characteristics of the anti-scattering green fluorescent lamps of Examples 1 to 6 thus obtained, and the degree of color of the green film on the outer surface of the lamp when these straight tube fluorescent lamps are turned off; That is, the results of visually evaluating the degree of green coloring are shown in the table below.

(Left below) As is clear from the above table, the lamps of Examples 1 to 6 of the present invention are conventional straight tube type 20-watt green fluorescent lamps (PL
Compared to the luminous flux value of a reference example in which a polyester resin tube for scattering prevention was covered over the 2 OS, G-F),
It can be seen that a high luminous flux value of about 170% was obtained, and the luminous flux maintenance rate was improved by about 20% even after 5000 hours of lighting. Furthermore, visual evaluation of the degree of coloring of the green film formed on the outer surface of the glass tube revealed that a bright and glossy green color was obtained, and it was recognized that the desired objective had been achieved.

Using the thus obtained fluorescent lamp, the following drop strength test was conducted.

First, when a fluorescent lamp was held horizontally and allowed to fall naturally from a height of 3 meters, the glass tube was broken, but the coating remained intact, and the glass pieces were firmly attached to the coating. Therefore, the glass pieces were protected by a coating and nothing flew away.

Next, as a shock test, two
Even when a 00 g steel ball was applied to the center of the fluorescent lamp at an angle of 30 degrees from the vertical line, the coating was not damaged at all.

In the above examples, as the phosphor having an emission peak in the range of 510 to 550 nm, a manganese-activated zinc silicate phosphor was given as an example, or a cerium- and terbium-activated lanthanum phosphate phosphor or a terbium-activated aluminate phosphor was used instead. By adopting a single coating method on the inner surface of the cerium-magnesium tube and forming a green resin film on the outer surface of the glass tube using a mixture of green pigment and polymer resin, we aim to improve luminous flux and luminous flux maintenance rate. It not only has a bright and glossy green appearance but also has a shatterproof effect, and it is extremely easy to form a coating that gives glass tubes a green appearance and has a shatterproof effect, making mass production and workability easier. Since the manufacturing cost and material cost are low due to the simplification, it is possible to realize a shatterproof green fluorescent lamp that can significantly reduce the cost.

Claims (2)

[Claims] (1) A green polymer resin made of a mixture of a green pigment and a scattering prevention polymer resin is applied to the outer surface of the glass tube, and a phosphor having an emission peak at 510 to 550 nm is applied to the inner surface of the glass tube. A shatterproof green fluorescent lamp that is characterized by its unique appearance. (2) The anti-scattering polymer resin includes polyurethane made by dispersing a urethane elastomer with a crosslinked structure in water, water-dispersed polymer polyester, organic solvent-soluble polyester polyol-based urethane, thermoplastic saturated polyester, and rubber-based oxime. The shatterproof green fluorescent lamp according to claim 1, characterized in that it is made of mold silicone and one type of rubber-based mold release silicone.