JP3206288B2 - Manufacturing method of fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a fluorescent lamp of immediate start type, a raw material of a transparent conductive film, for example, a dilute solution of alcohol of stannic chloride, contained in a tank is heated to 600 to 800 ° C. from a nozzle by air. In order to promote the formation of a transparent conductive coating by spraying into a metal pipe and at the same time obtain a homogeneous transparent conductive coating, the raw material of the transparent conductive coating is mixed with room temperature or heated air in the pipe. Then, the raw material of the transparent conductive film is atomized, sprayed into one end of a glass tube heated to 550 to 600 ° C. in a heating furnace in advance, and the remaining transparent conductive film material is sucked from the other end by a suction device. There is a method of forming a transparent conductive film on the inner surface of a glass tube by performing suction and discharge in the above.

[0003]

However, in such a conventional manufacturing method, when a transparent conductive film is formed, the film becomes porous and sodium contained in the glass tube easily moves onto the transparent conductive film. Also, the transparent conductive film and the mercury react easily. For this reason, mercury and sodium in the lamp react to form amalgam and a black-brown spot phenomenon occurs, or a phenomenon occurs in which the transparent conductive film is colored black during the lifetime, and the luminous flux maintenance factor as well as the lamp appearance is significantly impaired. It is.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a method for manufacturing a fluorescent lamp capable of maintaining a high luminous flux maintenance factor over its life without impairing the appearance of the lamp. is there.

[0005]

According to a method of manufacturing a fluorescent lamp according to the present invention, a transparent conductive film material is sprayed into a glass tube to form a transparent conductive film on the inner surface of the glass tube, and the transparent conductive film is formed. In a method of manufacturing a fluorescent lamp on which a phosphor film is formed, a transparent conductive film material composed of stannous chloride and antimony chloride as a dopant, and a room temperature or heated gas are heated to 900 to 1000 ° C. The transparent conductive coating material mixed with the gas is sprayed into the glass tube to form the transparent conductive film on the inner surface of the glass tube.

[0006]

With this configuration, black-brown spots and coloring of the transparent conductive film which occur during the lifetime can be suppressed, and a reduction in the maintenance rate of the luminous flux can be suppressed accordingly.

[0007]

Next, a method of manufacturing a fluorescent lamp according to an embodiment of the present invention will be described.

In FIG. 1, a raw material of a transparent conductive film contained in a tank 3, for example, an alcohol solution containing stannous chloride as a main component of the transparent conductive film and antimony chloride as a dopant is supplied from a nozzle 6 to 900 to 1000 ° C. , And mixed with air 9 heated to 200 to 800 ° C. therein, and the transparent conductive coating material mixed with the heated air was heated to 550 to 600 ° C. in the heating furnace 2. The raw material is introduced into the glass tube 1 from one end side, and the transparent conductive coating material mixed with the air is applied to the inner surface of the glass tube 1. Then, the remaining transparent conductive film raw material in the glass tube 1 is sucked and discharged from the other end side of the glass tube 1 by the suction device 8 to form a transparent conductive film over the entire length of the glass tube 1. Glass tube 1 on which this transparent conductive film is formed
, A protective film and a phosphor film are sequentially formed, sintering, sealing,
A fluorescent lamp (hereinafter, referred to as the present invention) is manufactured through a normal process such as exhaustion.

[0009] The transparent conductive film of the immediate start type fluorescent lamp is
It is provided for the purpose of assisting the starting of the lamp. In order to obtain a required starting voltage of the lamp, it is necessary to optimize the total resistance value and the distribution of the resistance value in the tube length direction. Therefore, not only the black-brown spot phenomenon of the fluorescent lamp using the transparent conductive film and the coloring phenomenon of the transparent conductive film, but also the starting voltage of the lamp and the luminous flux of the lamp were evaluated.

First, a fluorescent lamp was manufactured by the above-described method by combining stannous chloride or stannic chloride as a transparent conductive film raw material and antimony chloride or hydrofluoric acid as a dopant. The film surface state of the transparent conductive film of these lamps was observed with a scanning electron microscope, and the state of coloring of the transparent conductive film after lighting for 100 hours was examined. The results are shown in Table 1. In the figure, Sb represents antimony chloride, and HF represents hydrofluoric acid. Regarding the state of the film surface, the mark ◎ is the most dense, and the mark △
The mark indicates the coarsest, and regarding the coloration of the transparent conductive film, the mark ◎ indicates the least coloring, and the mark Δ indicates the most.

[0011]

[Table 1]

As is apparent from Table 1, it is found that the transparent conductive film in which stannous chloride and antimony chloride are combined has the densest film surface and is excellent without coloring after lighting for 100 hours. Was.

Based on these results, a transparent conductive film was formed and a lamp was manufactured using a combination of stannous chloride and antimony chloride and a mixture of stannic chloride and hydrofluoric acid in the same manner as described above, and the starting voltage at the time of lighting for 0 hours was determined. And pipe temperature (Fig. 2
(See FIG. 3) and the relationship between the lamp luminous flux and the pipe temperature (see FIG. 3). 2 and 3, curves A represent the lamp starting voltage and lamp luminous flux with respect to the temperature of the pipe 7 of the lamp using stannous chloride and antimony chloride as the raw material of the transparent conductive film, and curves B represent the transparent conductive film. The starting voltage of the lamp and the lamp luminous flux with respect to the temperature of the pipe 7 of the lamp using stannic chloride and hydrofluoric acid as raw materials are shown, respectively.

As is apparent from FIG. 2, in the case of a lamp using stannous chloride and antimony chloride, the starting voltage becomes minimum in a temperature range where the temperature of the pipe 7 is 900 ° C. or more, and stannic chloride and hydrofluoric acid are used. 600 ° C for lamps using
The starting voltage was lowest in the above temperature range. As is clear from FIG. 3, in the case of a lamp using stannous chloride and antimony chloride, the luminous flux starts to drop when the temperature of the pipe 7 is 1000 ° C. or higher, and in the case of a lamp using stannic chloride and hydrofluoric acid. At 800 ° C. or higher, the luminous flux began to fall.

From the above results, as a raw material for a transparent conductive film,
When stannous chloride and antimony chloride were used and the temperature of the pipe 7 was 900 to 1000 ° C., it was confirmed that a good transparent conductive film having a sufficiently low starting voltage and a high luminous flux was obtained.

Next, the above-described product of the present invention and a fluorescent lamp (hereinafter, referred to as a conventional product) manufactured by the same method as above using stannous chloride and hydrofluoric acid are respectively turned on to maintain a luminous flux. Rate and the degree of occurrence of the black-brown spot phenomenon were examined. FIG. 4 shows the relationship between the lighting time and the luminous flux maintenance factor, and FIG. 5 shows the relationship between the lighting time and the degree of occurrence of the black-brown spot phenomenon. 4 and 5, the curve A represents the product of the present invention, and the curve B represents the conventional product. 4 shows the ratio of the luminous flux at each time when the luminous flux at lighting 0 hour is 100, and FIG. 5 divides the degree of occurrence of black-brown spots into six levels of 0-5. 0 indicates that no black-brown spot phenomenon has occurred, and 5 indicates the most severely occurring state.

As is clear from FIG. 4, the product of the present invention has a smaller decrease in the luminous flux maintenance ratio than the conventional product. In addition, as is clear from FIG. 5, the product of the present invention has a clearly blackish brown spot phenomenon at a later time than the conventional product, and the degree thereof is also light.

As described above, according to the method of manufacturing the fluorescent lamp of this embodiment, the main components of the transparent conductive film raw material are stannous chloride, and the dopant is antimony chloride. The mixed gas is mixed in a pipe heated to 900 to 1000 ° C., and the mixed transparent conductive film raw material is sprayed into a glass tube to form a transparent conductive film on the inner surface of the glass tube 1. As a result, the transparent conductive film formed on the inner surface of the glass tube 1 has a smooth and dense surface, so that sodium contained in the glass tube 1 is less likely to move on the transparent conductive film, and mercury and The reaction with the transparent conductive film is reduced, so that black-brown spots generated during the life and coloring of the transparent conductive film can be suppressed, and accordingly, the decrease in the maintenance rate of the luminous flux can be suppressed.

[0019]

As described above, the present invention provides a method for manufacturing a fluorescent lamp in which the deterioration of the lamp appearance caused by the reaction of mercury, the transparent conductive film and sodium inside the lamp and the decrease of the luminous flux maintenance factor are suppressed during the life of the lamp. That can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a method of manufacturing a fluorescent lamp according to one embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between a pipe temperature and a starting voltage of a fluorescent lamp.

FIG. 3 is a diagram showing the relationship between the temperature of a pipe and the luminous flux of a fluorescent lamp.

FIG. 4 is a diagram showing a luminous flux maintenance factor of a fluorescent lamp.

FIG. 5 is a diagram showing a degree of occurrence of a black-brown spot phenomenon of a fluorescent lamp;

[Explanation of symbols]

 1 Glass tube 2 Heating furnace 6 Nozzle

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoji Inui 1-1, Sachimachi, Takatsuki City, Osaka Prefecture Inside Matsushita Electronics Corporation (56) References JP-A-53-34382 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01J 9/20

Claims (1)

(57) [Claims] 1. A method for manufacturing a fluorescent lamp, comprising: spraying a transparent conductive film material into a glass tube, forming a transparent conductive film on the inner surface of the glass tube, and forming a phosphor film on the transparent conductive film. , A transparent conductive film raw material comprising stannous chloride and antimony chloride as a dopant, and a room temperature or heated gas are mixed in a pipe heated to 900 to 1000 ° C., and this gas is mixed with the transparent conductive film. A method for manufacturing a fluorescent lamp, comprising forming the transparent conductive coating on the inner surface of the glass tube by spraying a coating material into the glass tube.