JPH04174954A - Scatter-proofing yellow fluorescent lamp - Google Patents

Abstract

PURPOSE:To enhance the luminous flux, achieve the effect scatter-prevention and also enable cost reduction of an orange fluorescent lamp by forming an orange resin film on the outer surface of the glass tube of the fluorescent lamp using a mixture of a water soluble orange organic pigment and a water soluble macromolecular resin. CONSTITUTION:A fluorescent lamp is immersed in a mixed liquid of a polyurethane water dispersed body and a water dispersed liquid of an orange organic pigment and is dried by hot air to form an orange thin film on the outer surface of the lamp. A high luminous flux value can thus be obtained and also the rate of maintenance of the luminous flux is enhanced. Besides, though the glass tube of the lamp is broken as a result of a drop test for the strength, the thin film would not be broken and glass pieces are attached to the film and so can be prevented from scattering. Since thus formation of the film is easy and manufacturing cost and material cost are low due to mass production and simplification of workability, cost reduction of the lamp is made possible.

Description

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

Conventional fluorescent lamps use glass tubes, so if the glass tube is damaged due to incorrect handling, glass pieces may fly off, potentially resulting in 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 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 In conventional orange fluorescent lamps, the inner surface of the glass tube contains 570~
A phosphor film that emits broadband light having a peak at 610 nm is formed. The inventor tried to make a prototype structure in which the outer surface of this glass tube was covered with an orange tube made of polyester resin to prevent scattering, and found that the luminous flux was low due to the poor visible light transmittance of the orange tube made of polyester resin. However, there was a problem in that the orange gloss and hue of the outer peripheral surface of the lamp were also poor.

Furthermore, the tube is extremely expensive due to the difficulty of processing it, and it also involves a process of manually covering the fluorescent lamp, which is extremely difficult to work with. 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 developed in view of these problems, and it is possible to easily, stably, and smoothly form a large amount of a shatterproof orange coating on the outer surface of a glass tube, and to significantly reduce costs compared to conventional methods. An object of the present invention is to provide an anti-scattering orange fluorescent lamp that can reduce the amount of water used.

Means for Solving the Problems In order to achieve this object, the shatter-proof orange fluorescent lamp of the present invention has an orange-colored fluorescent lamp made of a mixture of a water-soluble orange pigment and a shatter-proof water-soluble polymer resin on the outer surface of the glass tube. 570 to 610 on the inner surface of the glass tube.
It has a structure in which a phosphor having an emission peak at nm is deposited.

Effects According to the above configuration, it is possible to efficiently form a coating that is both orange in color and has anti-scattering properties on the outer surface of a glass tube in a large quantity and quickly.

Example Examples of the present invention will be described below.

9.90 g of polyurethane water dispersion (manufactured by Dai-Kogyo Seiyaku Co., Ltd.: Superflex 107) and an aqueous dispersion of 10 g of orange organic pigment (manufactured by Fuji Shiki Co., Ltd., SP Orange 556) were mixed thoroughly. After soaking a straight tube type 20 watt fluorescent lamp held horizontally, it was heated to 150℃.
By drying with warm air at a rate of 5 m/sec, an orange film made of polyurethane resin and having a thickness of 100 microns is formed on the outer surface of the glass tube.

In the straight tube type 20 Watt fluorescent lamp in the above embodiment, an orange phosphor film made of an orange-emitting phosphor having an emission peak at 570 to 610 nm, such as a tin-activated strontium orthophosphate phosphor, is formed on the inner surface of the glass tube. It has electrodes at both ends, and mercury and rare gas are sealed inside.

The results of measuring the characteristics of the shatterproof orange fluorescent lamp of the above example obtained in this way and the color degree of the orange coating on the outer surface of the lamp when these straight tube fluorescent lamps are turned off, that is, the orange color The results of visually evaluating the degree of coloring are shown in the table below.

As is clear from the above table, the lamp of the embodiment of the present invention is a conventional straight tube type 20-watt orange fluorescent lamp (tentative name: FL2O).
Compared to the 0-hour luminous flux value of the reference example in which the S, 0-F) was covered with an orange tube made of anti-scattering polyester resin, luminous flux values that were approximately 130% higher were obtained in both cases, and the luminous flux maintenance rate was also low. It can be seen that even after 5,000 hours of lighting, there is an improvement of about 5%. Furthermore, the lamp of the present invention had a visual evaluation of the degree of coloring of the orange coating formed on the outer surface of the glass tube, and it was found that a bright and glossy orange color of -1 was obtained, and the desired purpose was 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 the coating and there was no scattering.

Next, as a shock test, 20
Even when a 0 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.

As described in detail, according to the present invention, an orange resin film is formed on the outer surface of a glass tube using a mixture of a water-soluble orange organic pigment and a water-soluble polymer resin, thereby improving luminous flux.
It has a bright and glossy orange appearance, has a shatterproof effect, is extremely easy to form a coating on glass tubes, and has low manufacturing and material costs due to mass production and simplified workability. Therefore, it is possible to provide an anti-scattering orange fluorescent lamp that can significantly reduce costs.

Claims (2)

[Claims] (1) An orange polymer resin made of a mixture of a water-soluble orange organic pigment and a water-soluble polymer resin for preventing scattering is coated on the outer surface of the glass tube, and 570 to 610 nm is applied to the inner surface of the glass tube.
A shatterproof orange fluorescent lamp characterized by being coated with a phosphor having an emission peak at m. (2) The anti-scattering orange fluorescent lamp according to claim 1, wherein the anti-scattering water-soluble polymer resin is made of polyurethane in which a urethane elastomer having a crosslinked structure is dispersed in water.