JP2007115531A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp which is suitable, for example, for a cold cathode fluorescent lamp and in which a fluorescent tube and a stem are made of synthetic resin or rubber and a breakage can be avoided by making a weight lighter and raising impact resistance and while an operation safety is secured, a heat radiation from these units is controlled and a rationalized arrangement is realized and a housing and a space can be made smaller, and in which a shape and ornamental flexibility can be obtained and while a variety of fluorescent tubes can be produced, productivity can be increased by dispensing with coating of a phosphor material and production cost can be reduced. <P>SOLUTION: The fluorescent lamp is provided with a fluorescent tube 2, on an inner face of which a phosphor layer 3 is formed, and a stem 5 which fixes an electrode 7 placed in the above tube 2 and seals both ends of the above fluorescent tube 2 and seals filling gas in the above tube 2. The above fluorescent tube 2 is made of synthetic resin having heat resistance and transparency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is suitable for cold cathode fluorescent lamps, for example, and by making fluorescent tubes and stems made of synthetic resin or rubber, the weight is reduced, impact resistance is improved, damage is prevented, and safety in use is improved. In addition to ensuring that the heat radiation is reduced, rational arrangement and miniaturization of storage equipment and space can be realized, and the degree of freedom of shape and decoration can be obtained, while various fluorescent tubes can be manufactured. The present invention relates to a fluorescent lamp capable of improving productivity by eliminating the need to apply a fluorescent substance and manufacturing the same at low cost.

  A cold cathode fluorescent lamp consumes less power than a hot cathode fluorescent tube using a filament, and can obtain a substantially uniform brightness throughout the fluorescent tube. The electrode structure can also be miniaturized and the fluorescent tube can be made thinner. Since it can be realized, it is widely used as a backlight light source for liquid crystal displays and various display light sources.

  As the cold cathode fluorescent lamp, a fluorescent film was formed on the inner surface, and a fluorescent tube made of glass tube in which an inert gas such as mercury or argon gas was sealed, and a stem sealed at both ends of the fluorescent tube were attached. Some have a pair of discharge electrodes and a lead wire for power feeding led out of the fluorescent tube from the discharge electrodes (see Patent Documents 1 and 2).

However, since the cold cathode fluorescent lamp is made of a glass tube, there is a concern about impact resistance, durability, and strength. In addition, when the stem portion exposed to high heat is formed of a metal material instead of a glass material, there are problems such as causing a corrosion problem.
Furthermore, since the phosphor film needs to be coated with a phosphor containing a phosphor after the glass tube is formed, there is a problem that the manufacturing process is complicated and troublesome, and the cost is increased accordingly.

  In order to solve such a problem, a cylindrical member made of synthetic resin is attached to the outside of a glass tube of a fluorescent lamp, and rubber lid-like members are attached to both ends thereof, and the outer periphery of the cylindrical member There is a fluorescent lamp display tool in which a synthetic resin advertising member is movably wrapped around a surface and predetermined advertising information is displayed on the advertising member (see Patent Document 3).

  The display device can protect the glass tube by the cylindrical member, but since the production and installation of the cylindrical member are required, the number of parts increases accordingly, the production becomes complicated and the cost increases, and the glass tube Since the cylindrical member is mounted on the outside, there is a problem that the display device is large and heavy.

Japanese Patent Application Laid-Open No. 8-241893 JP 2003-187746 A JP 2005-215181 A

  The present invention solves such problems, and is suitable for cold cathode fluorescent lamps, for example, and by making fluorescent tubes and stems, etc., made of synthetic resin or rubber, the weight is reduced, impact resistance is improved, and damage is prevented. In addition to ensuring safety in use and suppressing heat dissipation from them, rational arrangement and miniaturization of storage equipment and space can be realized, and flexibility in shape and decoration can be obtained. An object of the present invention is to provide a fluorescent lamp that can manufacture a simple fluorescent tube, improves the productivity by eliminating the need to apply a fluorescent substance, and can manufacture the fluorescent tube at a low cost.

The invention of claim 1 is a fluorescent tube having a fluorescent layer formed on the inner surface, a stem to which an electrode disposed in the tube is attached, and both ends of the fluorescent tube are sealed to seal the sealed gas in the tube, The fluorescent tube is made of a synthetic resin with heat resistance and translucency, which is lighter and more impact resistant than conventional glass tube fluorescent tubes, and collides with foreign matter. In addition, it prevents damage during the fall and secures convenience and safety in use, prevents damage during the earthquake and scattering of debris, and ensures safety in disaster prevention.
In addition, the fluorescent lamp surface temperature rise and heat dissipation are suppressed, and fluorescent lamps are closely arranged and the installation space in the equipment that houses the fluorescent lamps is made compact, and the indoor installation space is more compact. The interior effect can be improved.
The invention of claim 2 is that the stem is made of synthetic resin or rubber, and in combination with the fluorescent tube, the stem is reduced in weight and impact resistance is improved. Compared to a conventional fluorescent tube made of glass tube, It is designed to ensure convenience and safety in use by preventing damage when colliding with a foreign object or falling.

According to a third aspect of the present invention, a synthetic resin gas barrier layer is formed on the outer surface and / or the inner surface of the fluorescent tube to prevent leakage of an enclosed gas or the like in the fluorescent tube, thereby stabilizing the operation of the fluorescent lamp. I am doing so.
In addition, by making the gas barrier layer on the outer surface side made of synthetic resin, combined with the fluorescent tube made of synthetic resin, the heat radiation from the fluorescent tube is suppressed, and the temperature rise in the electronic equipment and the room where the fluorescent lamp is housed. It is possible to prevent a decrease in the operation of the electronic equipment and an increase in the cooling load in the room.
According to a fourth aspect of the present invention, a predetermined synthetic resin and a fluorescent material are mixed to form the fluorescent tube, and the fluorescent material is densely distributed on the inner surface of the fluorescent tube to form a fluorescent layer. After forming the fluorescent tube, the step of forming the fluorescent layer in the tube by coating or the like is omitted, so that the fluorescent tube can be manufactured easily, quickly and inexpensively.

In the invention of claim 5, the fluorescent tube is immersed in a predetermined molten resin to form a film-like gas barrier layer on the outer surface and / or the inner surface of the fluorescent tube, and the gas barrier layer can be easily and rationally manufactured. I am doing so.
In the invention of claim 6, a fluorescent layer is formed on the inner surface of the stem, and a gas barrier layer is formed on the outer surface thereof, thereby improving the brightness in the stem portion and preventing leakage of enclosed gas or the like in the fluorescent tube. The stable operation can be improved.
According to a seventh aspect of the present invention, the plurality of fluorescent tubes are closely arranged so that the high-intensity illumination device can be miniaturized and the housing equipment and the like can be miniaturized.
The invention of claim 8 is that the fluorescent lamp is a cold cathode fluorescent lamp, which improves the weight reduction and impact resistance of the conventional cold cathode fluorescent lamp, prevents damage when colliding with a foreign object or dropping, It is intended to ensure convenience and safety in use.

In the invention of claim 1, since the fluorescent tube is made of a synthetic resin having heat resistance and translucency, the weight reduction and the impact resistance are improved as compared with the fluorescent tube made of a conventional glass tube. It is possible to prevent damage at the time of collision or dropping, and to ensure convenience and safety in use, to prevent damage and scattering of debris during an earthquake, and to ensure safety in disaster prevention.
In addition, the fluorescent lamp can be kept in close proximity and the installation space inside the equipment that houses the fluorescent lamp can be made compact by suppressing the surface temperature rise and heat dissipation of the fluorescent tube, and the indoor installation space can be made more compact. This has the effect of improving the interior effect.
In the invention of claim 2, since the stem is made of synthetic resin or rubber, it is combined with the fluorescent tube to reduce the weight of the stem and improve the impact resistance. It is possible to prevent breakage and ensure convenience and safety in use.

In the invention of claim 3, since a gas barrier layer made of synthetic resin is formed on the outer surface and / or the inner surface of the fluorescent tube, the leakage of the sealed gas or the like in the fluorescent tube is prevented and the operation of the fluorescent lamp is stabilized. Can be planned.
In addition, by making the gas barrier layer on the outer surface side made of synthetic resin, combined with the fluorescent tube made of synthetic resin, the heat radiation from the fluorescent tube is suppressed, and the temperature rise in the electronic equipment and the room where the fluorescent lamp is housed. It is possible to prevent a decrease in the operation of the electronic device and an increase in the indoor cooling load.
In the invention of claim 4, a predetermined synthetic resin and a fluorescent material are mixed to form the fluorescent tube, and the fluorescent material is densely distributed on the inner surface of the fluorescent tube to form a fluorescent layer. In addition, after forming the fluorescent tube, the step of forming a fluorescent layer in the tube by coating or the like is omitted, and the fluorescent tube can be manufactured easily, quickly and inexpensively.
According to the fifth aspect of the present invention, since the film-like gas barrier layer is formed on the outer surface and / or the inner surface of the fluorescent tube by immersing the fluorescent tube in a predetermined molten resin, the gas barrier layer is easily and rationally manufactured. be able to.

According to the sixth aspect of the present invention, since the fluorescent layer is formed on the inner surface of the stem and the gas barrier layer is formed on the outer surface thereof, the luminance is improved in the stem portion and leakage of the enclosed gas or the like in the fluorescent tube is prevented. Can improve the stable operation.
According to the seventh aspect of the present invention, since the plurality of fluorescent tubes are closely arranged, it is possible to reduce the size of the high-luminance lighting device and the size of the housing equipment.
In the invention of claim 8, since the fluorescent lamp is a cold cathode fluorescent lamp, the conventional cold cathode fluorescent lamp is reduced in weight and impact resistance, and is prevented from colliding with a foreign object or being damaged when dropped. , Can ensure the convenience and safety in use.

  Hereinafter, the illustrated embodiment in which the present invention is applied to a cold cathode fluorescent lamp will be described. In FIGS. 1 to 3, reference numeral 1 denotes a substantially cylindrical fluorescent lamp having translucency (transparent or translucent) and heat resistance. A fluorescent tube 2 made of synthetic resin is provided, and a fluorescent layer 3 is formed on the inner surface of the tube 2 and a gas barrier layer 4 made of synthetic resin is formed on the outer surface thereof.

  The fluorescent lamp 2 is made of a synthetic resin material having translucency and heat resistance, a fluorescent material corresponding to a desired fluorescent color, for example, calcium tungstate for blue, calcium halophosphate for white, Colored pigments are mixed, and these are melted and kneaded and extruded into a tubular shape. At the time of molding, the fluorescent material is floated to form the fluorescent layer 3.

  That is, when the fluorescent tube 2 is extruded, the fluorescent layer 3 causes the fine particles of the fluorescent material to float on the inner surface of the fluorescent tube 2 based on physical properties such as specific gravity and molecular structure of the synthetic resin material and the fluorescent material. Alternatively, they are extruded or oozed out and are densely distributed to form the fluorescent tube 2 at the same time.

  The exudation effect of the fluorescent substance mainly depends on the glass transition temperature of the synthetic resin material of the fluorescent tube 2, that is, the temperature at which the phase of the synthetic resin shifts from the glass state to the rubber state, and the compatibility with the synthetic resin. When the glass transition temperature was lower than room temperature, it was confirmed that the movement of the main chain became active and the fluorescent material easily moved to the inner surface of the fluorescent tube 2. Therefore, it is desirable to set the room temperature during the extrusion molding as low as possible.

The gas barrier layer 4 is formed of a synthetic resin having translucency (transparent or translucent), and the thin film is hermetically and integrally coated on the outer peripheral surface of the fluorescent tube 2 so as to be enclosed in the fluorescent tube 2. And argon gas leakage can be prevented.
The gas barrier layer 4 is formed by, for example, extruding the fluorescent tube 2, cutting it into a predetermined length, masking the inner surface of the tube, and immersing it in a synthetic resin melting tank as a material for forming the gas barrier layer 4. The outer peripheral surface is coated in a film shape.
In this case, the gas barrier layer 4 can be omitted if the structure of the resin forming the fluorescent tube 2 is dense and can completely prevent leakage of the enclosed gas in the tube.

  Stem 5 is airtightly attached to both ends of the fluorescent tube 2 via a sealing material (not shown), and the stem 5 is formed into a substantially dish shape by a synthetic resin material or rubber (natural rubber or synthetic rubber) having heat resistance. Molded.

In this case, the stem 5 can be formed of the same synthetic resin as that of the fluorescent tube 2, so that the fluorescent tube 2 and the stem 5 can be formed simultaneously.
At that time, out of a set of parts in which the fluorescent tube 2 and the stem 5 are molded at the same time, this is divided into two parts at one stem or the end of the fluorescent tube 2 and they are butted and joined together. Can be omitted or reduced, and a change in luminance can be suppressed.

A substantially disc-shaped stem mount 6 projects from the center of the stem 5, and an electrode 7 having no coil portion such as a filament projects from the mount 6.
The electrode 7 is connected to a pin plug 9 via a lead wire 8, and the plug 9 protrudes outside the stem mount 6 so that it can be connected to a power source.

  A stem flange 10 is formed on the outer periphery of the stem 5, an annular groove 11 is formed between the flange 10 and the stem mount 6, and an end of the fluorescent tube 2 is fitted into the groove 11, and the fluorescent tube The stem flange 10 is fitted to the outer end portion of 2 and is airtightly attached.

  In this case, if the stem 5 is made of the same material as the fluorescent tube 2, the fluorescent material is densely distributed on the inner side thereof to form the fluorescent layer 3, and the gas barrier layer 4 is covered on the outer peripheral surface thereof, the stem 5 The fluorescent action of the portion is increased, the luminance of the fluorescent lamp 1 is increased correspondingly, the leakage of the sealed gas from the stem 5 portion can be prevented, and the deterioration of the fluorescent lamp 1 can be prevented.

The cold cathode fluorescent lamp configured as described above is manufactured by molding the fluorescent tube 2 and the stem 5 with synthetic resin.
Among these, when the fluorescent tube 2 is resin-molded, a desired synthetic resin material having translucency and heat resistance is selected, and a fluorescent material corresponding to a desired fluorescent color, for example, blue In this case, calcium tungstate is mixed. In the case of white, calcium halophosphate and a pigment of a desired color are mixed, and these are extruded into a circular tube in a molten and kneaded state.

When the fluorescent tube 2 is formed, the fluorescent material is floated, and the fluorescent material is densely distributed and exposed on the inner surface of the fluorescent tube 2 to form the fluorescent layer 3.
That is, at the time of extrusion molding of the fluorescent tube 2, the fine particles of the fluorescent material are lifted or extruded on the inner surface of the fluorescent tube 2 based on the physical properties difference between the synthetic resin material and the fluorescent material, such as the molecular structure, or bleeding. The fluorescent tube 2 is formed at the same time as the fluorescent tube 2. Therefore, the conventional complicated process of applying the fluorescent layer after forming the glass tube is unnecessary, and this can be easily and quickly manufactured at a low cost.

  The exudation effect of the fluorescent material mainly depends on the glass transition temperature of the synthetic resin material of the fluorescent tube 2, that is, the temperature at which the phase of the synthetic resin shifts from the glass state to the rubber state, and the compatibility with the synthetic resin. However, when the glass transition temperature is lower than room temperature, the movement of the main chain becomes active, and the fluorescent material easily moves to the inner surface of the fluorescent tube 2. Therefore, the room temperature at the time of the extrusion molding is set as low as possible.

  Next, after the molding, the fluorescent tube 2 is cut into a predetermined length, the inside of the tube is appropriately masked, and after the treatment for preventing adhesion to the inner surface of the tube, it has translucency as a material for forming the gas barrier layer 4 A film-like gas barrier layer 4 is formed on the outer peripheral surface of the fluorescent tube 2 by dipping in a melting tank of a desired synthetic resin material.

  Further, when the stem 5 is molded with resin (including rubber), a predetermined mold is prepared, and this is filled with a desired synthetic resin material having heat resistance, and at that time, the lead wire 6 and The base portions of the electrode 7 and the pin plug 9 are embedded and molded.

  As described above, the present invention is produced by molding the fluorescent tube 2 and the stem 5 by synthetic resin molding, so that the desired shape and cross-sectional shape of the fluorescent tube 2 and the stem 5 can be easily compared to those made of glass tube or metal. Can be produced. In addition, by mixing a pigment of a desired color with this, it is possible to respond to various decorations of the fluorescent lamp in combination with the above.

  When assembling a fluorescent lamp using the fluorescent tube 2 and the stem 5 thus manufactured, the fluorescent tube 2 and a pair of left and right stems 5 are prepared, and the stem mounts 6 are fitted to the inner surfaces of both ends of the fluorescent tube 2, Both ends of the fluorescent tube 2 are fitted into the annular groove 11, the stem flange 10 is fitted to the outer periphery of both ends of the fluorescent tube 2, and these are hermetically and firmly bonded, and then a predetermined pressure is applied in the fluorescent tube 2. It is possible to enclose mercury, argon gas, or the like to be filled.

  The fluorescent lamp 1 assembled in this way is light in weight because the fluorescent tube 2 and the stem 5 are made of synthetic resin, and is superior in impact resistance compared to a conventional tube tube made of these, and collides with or falls on a foreign object. However, it does not break easily. Therefore, handling and storage of the fluorescent lamp 1 are facilitated, and it is possible to prevent a situation in which the fluorescent lamp 1 is damaged particularly during an earthquake and the fragments are scattered.

  Further, since the thermal conductivity of the synthetic resin covering the fluorescent tube 2 is about 1/6 to 1/4 of the thermal conductivity of glass (quartz), the heat radiation and radiant heat from the fluorescent tube 2 are suppressed, and the fluorescence is reduced. Controls temperature rises in electronic devices such as personal computers and electrical devices such as personal computers that are equipped with the lamp 1 and indoor temperature rises, prevents a decrease in the operation of electronic devices, etc., and prevents an increase in indoor cooling load. Maintain the air conditioning condition.

The operation of the fluorescent lamp 1 is substantially the same as that of a conventional fluorescent lamp.
That is, when the fluorescent lamp 1 is connected to a power source and the electrode 7 is energized through the pin plug 9 and the lead wire 8, the electrode 7 is heated and electrons are emitted.
Simultaneously with the heating of the electrode 7, the enclosed mercury becomes a vapor, and when the pressure reaches a predetermined pressure, the electrons collide with the mercury vapor, and then the electrons are ejected to start ionization.
When the electron trajectory changes and ultraviolet light is emitted, this excites the fluorescent material of the fluorescent layer 3, so that the ultraviolet light hits the fluorescent material, and visible light having a longer wavelength than the ultraviolet light is emitted from the fluorescent material. Forming the light source.

When the fluorescent lamp 1 is operated, the synthetic resin gas barrier layer 4 covering the outer peripheral surface of the fluorescent tube 2 prevents the mercury or argon gas enclosed in the fluorescent tube 2 from flowing out. While maintaining stable operation, the deterioration is prevented.
Moreover, since the thermal conductivity of the synthetic resin forming the gas barrier layer 4 is about 1/6 to 1/4 of the thermal conductivity of glass (quartz) as in the fluorescent tube 2, the heat dissipation of the fluorescent tube 2 is achieved. Combined with the blocking action or the heat insulating effect, the temperature rise in the electronic equipment or electrical equipment such as a personal computer to which the fluorescent lamp 1 is attached and the temperature rise in the room are suppressed.

3 to 6 show other embodiments of the present invention, and the same reference numerals are used for portions corresponding to the configurations of the above-described embodiments.
Among these, FIG. 3 shows a second embodiment of the present invention, in which a similar gas barrier layer 4 is formed on the inner and outer surfaces of the fluorescent tube 2 and the fluorescent layer 12 is applied to the inner surface of the inner gas barrier layer 4. It is formed by coating with etc.

By providing the gas barrier layer 4 on the inner and outer surfaces of the fluorescent tube 2 in this way, leakage of the sealed gas is strongly prevented, and stable operation of the fluorescent lamp 1 can be obtained over a long period of time.
Further, by forming the fluorescent layer 12 on the inner surface of the inner gas barrier layer 4, when the fluorescent tube 2 is immersed in the molten resin tank to form the gas barrier layer 4 as described above, the inner and outer surfaces of the fluorescent tube 2 are simultaneously formed. The gas barrier layer 4 can be formed, and the mask processing in the fluorescent tube 2 as described above is not troublesome, and can be rationally manufactured.

4 and 5 show a third embodiment of the present invention. In this embodiment, a plurality of the fluorescent lamps 1 are arranged in close contact with each other in a lamp case 13 having an opening at the bottom.
Even when the fluorescent lamps 1 are arranged closely in this way, the material of the fluorescent tube 2 itself and the gas barrier layer 4 provided on the outer peripheral surface of the fluorescent lamp 1 exhibit the above-described heat insulation effect, so that the temperature rise of the adjacent fluorescent tube 2 is suppressed. Thus, it is possible to prevent deterioration of the operation of the fluorescent lamps 1 and to obtain a high-luminance lighting device in which the fluorescent lamps 1 are reasonably arranged in a small space.

  In addition, since the heat emission of the fluorescent lamp 1 or the temperature rise of the fluorescent tube 2 can be suppressed, the fluorescent lamp 1 needs to be arranged away from the mounting plate in the electronic device as in the prior art, or protruded from the indoor ceiling. As a result, the electronic equipment can be made more compact, and the interior effect can be improved by eliminating the sense of indoor noise.

  In this case, since the fluorescent tube 2 and the stem 9 are made of synthetic resin, the fluorescent lamp 1 can be formed into a rectangular column shape having a rectangular cross section as shown in FIG. Improves rational arrangement.

FIG. 6 shows a fourth embodiment of the present invention, and this embodiment shows an operation control circuit of the fluorescent lamp 1 incorporating an inverter circuit. That is, although a high voltage is required for the operation of the cold cathode lamp, as a step-up transformer 14 for this purpose, even if the secondary side is short-circuited, no overcurrent flows on the primary side, and a high-voltage is instantaneously applied and short-circuited. -A cage transformer is used.
The basic circuit of the inverter constitutes a multivibrator with first and second transistors 14 and 15, load resistors 16 and 17, and a capacitor 18 as shown in the figure.

The operation control circuit can be applied to a single or a plurality of fluorescent lamps 1. In the former case, the operation control circuit is reduced in size and incorporated in a mounting device for the fluorescent lamp 1, and in the latter case, the operating control circuit is separated from the mounting device. Install it in a place where it is easy to operate.
Also, an arbitrary fluorescent lamp 1 is identified by an ID number, and this is controlled by boosting the ON / OFF operation of the step-up transformer 14 and the step-up transformer 14 by using a remote control switch such as wireless or infrared. It is possible.

  The fluorescent lamp of the present invention is made of a fluorescent tube and a stem made of synthetic resin or rubber, thereby reducing the weight and improving the impact resistance to prevent breakage and ensuring safety in use. By suppressing heat dissipation, rational arrangement and miniaturization of storage equipment and installation space are realized, and the degree of freedom in shape and decoration can be obtained. This is suitable for a cold cathode fluorescent lamp, for example, because it can be manufactured at a low cost by eliminating the need for the above.

It is sectional drawing of the cold cathode fluorescent lamp to which this invention is applied. It is sectional drawing in alignment with the AA of FIG. 1, and has expanded a little. It is sectional drawing which shows the principal part of the 2nd Embodiment of this invention, forms the gas barrier layer inside and outside a fluorescent tube, and coat | covers the fluorescent layer on the inner surface of the gas barrier layer inside it. It is a perspective view which shows the 3rd Embodiment of this invention, and has arrange | positioned the several fluorescent lamp closely in the storage case. It is a perspective view which shows the prismatic fluorescent lamp arrange | positioned in the storage case of the said 3rd Embodiment. FIG. 6 is an operation control circuit diagram of a fluorescent lamp showing a fourth embodiment of the present invention, and shows its basic circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluorescent lamp 2 Fluorescent tube 3,12 Fluorescent layer 4 Gas barrier layer
5 stem 7 electrode

Claims (8)

  In a fluorescent lamp comprising: a fluorescent tube having a fluorescent layer formed on the inner surface; and a stem to which an electrode disposed in the tube is attached, and both ends of the fluorescent tube are sealed to seal off the sealed gas in the tube, A fluorescent lamp characterized in that the fluorescent tube is made of a synthetic resin having heat resistance and translucency.   The fluorescent lamp according to claim 1, wherein the stem is made of synthetic resin or rubber.   The fluorescent lamp according to claim 1, wherein a gas barrier layer made of a synthetic resin is formed on an outer surface and / or an inner surface of the fluorescent tube.   2. The fluorescent lamp according to claim 1, wherein a predetermined synthetic resin and a fluorescent material are mixed to form the fluorescent tube, and the fluorescent material is densely distributed on the inner surface of the fluorescent tube to form a fluorescent layer.   The fluorescent lamp according to claim 3, wherein the fluorescent tube is immersed in a predetermined molten resin to form a film-like gas barrier layer on the outer surface and / or the inner surface of the fluorescent tube.   The fluorescent lamp according to any one of claims 3 to 5, wherein a fluorescent layer is formed on an inner surface of the stem and a gas barrier layer is formed on an outer surface thereof.   The fluorescent lamp according to claim 3, wherein the plurality of fluorescent tubes are closely arranged. The fluorescent lamp according to claim 1, wherein the fluorescent lamp is a cold cathode fluorescent lamp.

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