JPH04294049A - Rapid starting fluorescent lamp - Google Patents

Abstract

PURPOSE:To suppress blackening of a fluorescent film, and also an electroconductive film turning yellowish which is generated in a rapid starting fluorescent lamp due to a long time lighting. CONSTITUTION:An electroconductive film 2 is formed over the inner surface of a glass tubing 1, and thereover a protection film 3 is formed. That portion of protection film 3 in the neighborhood of one end of the glass tubing 1 is removed in the longitudinal direction with a certain specified length and width so as to provide a protection missing part 4. A fluorescent film 5 is formed on the protection film 3 and the conductive film 2 in this protection missing part 4. A stem 8 provided with a filament coil 6 is installed sealedly at each end of the glass tubing 1.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid start type fluorescent lamp having a conductive coating formed on its inner surface.

0003

[Prior Art] Conventionally, rapid start type fluorescent lamps have a transparent conductive film mainly composed of tin oxide formed between the inner surface of the glass tube and the fluorescent film, and electrodes at both ends of the glass tube. The structure is such that each part is sealed and a predetermined amount of mercury is encapsulated.

[0004] As this rapid-start type fluorescent lamp is lit for a long time, yellowing occurs in the conductive coating, although the details of the cause are unknown.

[0005] Therefore, a structure in which a protective film made of a metal oxide such as alumina is interposed between the conductive film and the fluorescent film is adopted to suppress yellowing of the conductive film.

[0006]

[Problems to be Solved by the Invention] In the conventional rapid-start type fluorescent lamp described above, a protective film is interposed between the conductive film and the fluorescent film to suppress yellowing of the conductive film. When a protective film is interposed between the conductive film and the fluorescent film to prevent yellowing, spot-like blackening occurs on the fluorescent film at a distance of 5 to 15 cm from one electrode part to the other. A problem arises in that it becomes more likely to occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rapid start type fluorescent lamp that suppresses both yellowing of the conductive film and blackening of the fluorescent film.

[Configuration of the invention]

[0009]

[Means for Solving the Problems] The rapid start type fluorescent lamp of the present invention has a protective film made of a metal oxide interposed between a conductive film and a fluorescent film laminated on the inner surface of a glass tube. In the rapid start type fluorescent lamp thus formed, the protective film is provided with a notch, and the conductive film and the fluorescent film are laminated in this notch without interposing the protective film. .

0010

[Operation] The rapid start type fluorescent lamp of the present invention is formed by interposing a protective film made of a metal oxide between the conductive film and the fluorescent film laminated on the inner surface of the glass tube. Furthermore, a notch is provided in this protective film, and in this notch, the conductive film and the fluorescent film are laminated without interposing the protective film. For this reason, it is estimated that the amount of slight discharge between the mercury enclosed and aggregated in the glass tube and the conductive coating is reduced, and as a result, blackening of the fluorescent film is suppressed. Furthermore, since a protective film is interposed between the conductive film and the fluorescent film in areas other than the notch, yellowing of the conductive film is suppressed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rapid start type fluorescent lamp of the present invention will be described with reference to FIGS. 1 to 7.

In FIG. 1, 1 is a straight pipe with a diameter of 3, for example.
As shown in FIG. 5, a transparent conductive coating 2 containing tin oxide (Sn 2 O) as a main component is formed on the inner surface of the glass tube 1 of 2 mm. Further, on this conductive film 2, for example, alumina (Al 2 O 3
A protective film 3 made of a metal oxide such as ) is laminated to a thickness of 0.5 μm or more.

The protective film 3 is formed by first applying a suspension containing alumina to the inner surface of the glass tube 1 on which the conductive film 2 has been formed. And this glass tube body 1
For example, as shown in FIG. 1, the area where mercury sealed inside the glass tube body 1 is most likely to agglomerate and the fluorescent film to darken is most likely to occur is a length of 200 mm along the longitudinal direction from one end of the glass tube body 1.
, the coating film is removed from above the conductive coating 2 over a width of 2 mm to form a notch 4. This notch 4
After forming, a drying process or a drying and baking process is performed to form the protective film 3 having the cutout portions 4.

Furthermore, a fluorescent film 5 is formed on the protective film 3 and the conductive coating 2 in the notch 4. Therefore, in the glass tube body 1, the fluorescent film 5 is laminated on the conductive coating 2 at the notch 4 of the protective film 3, and the fluorescent film 5 is laminated on the conductive coating 2 at the notch 4 of the protective film 3.
In other parts, as shown in FIG. 5, a protective film 3 is interposed between the conductive film 2 and the fluorescent film 5.

As shown in FIGS. 1 and 5, filament coils 6 are installed at both ends of the glass tube 1, respectively.
A stem 8 serving as an electrode portion provided with an introduction wire 7 electrically connected to the stem 8 is sealed. After sealing the stem 8, the inside of the glass tube 1 is evacuated, a predetermined amount of mercury vapor and low-pressure argon gas are filled in, and caps 9 are fixed to both ends of the glass tube 1. , rapid start type fluorescent lamp 11
Complete a.

Next, the operation of this embodiment will be explained.

[0017] The rapid start type fluorescent lamp 11a
Since the protective film 3 made of metal oxide is interposed between the conductive film 2 and the fluorescent film 5, this conductive film 2
Prevents yellowing. Although the detailed reason for this is unknown, it is presumed that the progress of chemical changes in the conductive film 2 is prevented. Moreover, since this protective film 3 is formed to have a film thickness of 0.5 μm or more, the yellowing evaluation score is as determined from the graph showing the relationship between the protective film 3 and the yellowing evaluation score shown in FIG. The score is improved and yellowing can be suppressed.

Further, when the rapid start type fluorescent lamp 11a is turned on, the protective film 3 is not interposed between the conductive film 2 and the fluorescent film 5 in the notch 4 of the protective film 3, so that the fluorescent film The occurrence of spotty blackening in No. 5 could be suppressed. Although the details of this reason are unknown, it is presumed as follows. That is, the impedance between the filament coil 6 and the conductive film 2 at the time of starting discharge can be made smaller in the cutout portion 4 than in the case where the protective film 3 is interposed. For this reason, the potential difference generated between the filament coil 6 and the conductive film 2 at the time of starting the discharge is reduced, and the amount of slight discharge between the liquefied and agglomerated mercury and the conductive film 2 is reduced. be able to. For this reason, speckled blackening of the fluorescent film 5 due to mercury adhering to the inner surface of the glass tube 1 can be prevented.

As described above, by simply providing the cutout portion 4 in the protective film 3 without interposing the conductive film 2 and the fluorescent film 5, yellowing of the conductive film 2 and blackening of the fluorescent film 5 can be prevented. can also be suppressed.

In the above embodiment, the notch 4 of the protective film 3 is provided at one location near one end of the glass tube body 1, but in addition to this notch 4, the notch 4 is provided in the vicinity of one end of the glass tube body 1. Even if the notch portion 4 facing the portion 4 is provided at one end portion of the glass tube body 1, the occurrence of spot-like blackening of the fluorescent film 5 is similarly suppressed. At this time, as shown in FIG. 7, if the overall area of the notches 4 of the protective film 3 is the same, if the notches 4 are provided in multiple parts, compared to the notches 4 provided at one location. As a result, the blackening evaluation score increases,
The effect of suppressing blackening is increased.

Furthermore, the shape of the notch 4 is not limited to the above embodiment, and the area of the notch 4 is preferably 25 mm 2 or more.

Therefore, as shown in FIG.
may be formed to have an appropriate length and width as long as it has an area greater than or equal to the above area. Alternatively, as shown in FIG. 3, the glass tube 1 may be formed to have a predetermined width and length along the longitudinal direction from near the end. Furthermore, as shown in FIG. 4, a notch 4 is provided along the circumferential direction near the end of the glass tube 1.
may be formed.

Next, a second embodiment of the rapid start type fluorescent lamp of the present invention will be explained based on FIGS. 8 to 11.

In FIG. 8, a glass tube 1 is a straight tube with a diameter of 15 mm, for example, and a transparent conductive coating 2 containing tin oxide as a main component is formed on the inner surface of the glass tube 1. Furthermore, a protective film 3 made of, for example, alumina is laminated on the conductive film 2 to a thickness of 0.5 μm or more.

Similar to the first embodiment, this protective film 3 is removed from above the conductive coating 2 along the longitudinal direction from one end of the glass tube 1 by a predetermined length and a predetermined width. , a notch 4 is provided.

Furthermore, a fluorescent film 5 is formed on the protective film 3 on the inner surface of the glass tube 1 and the conductive coating 2 on the notch 4. Therefore, at the notch 4 of the protective film 3, the glass tube 1 has a conductive coating 2 and a fluorescent film 5 on the inner surface.
As shown in FIG. 5, a protective film 3 is interposed between the conductive film 2 and the fluorescent film 5 on the inner surface except for the notch 4. As shown in FIG. And this glass tube body 1
The tube wall load is set to 0.07 W/cm2 or more.

Further, a stem 8 serving as an electrode portion is sealed at both ends of the glass tube body 1, and each has a lead-in wire 7 that is electrically connected to the filament coil 6. This stem 8 has an exhaust pipe 15 that communicates with the inside of the glass tube body 1.
is provided. In the manufacturing process of the rapid-start type fluorescent lamp 11b, the exhaust pipe 15 is used to exhaust the inside of the glass tube body 1 through the exhaust pipe 15, and then fill it with a predetermined amount of mercury vapor and low-pressure argon gas. The body 1 is sealed at a length L of 10 to 15 mm from the sealed end 16.

Furthermore, as shown in FIG. 8, an adhesive such as silicone resin is filled as a filler 17 around the exhaust pipe 15, and a cap is fixed to the sealed end 16, thereby forming a rapid start type fluorescent lamp 11b. is completed.

Next, the operation of the present invention will be explained.

[0030] This rapid start type fluorescent lamp 11b
As in the first embodiment, since the protective film 3 made of metal oxide is interposed between the conductive film 2 and the fluorescent film 5, the progress of chemical changes in the conductive film 2 is prevented. This prevents yellowing of the conductive film 2.

Also, like the first embodiment, this rapid start type fluorescent lamp 11b has a protective film formed between the conductive film 2 and the fluorescent film 5 in the notch 4 of the protective film 3 during lighting. 3 was not present, it was possible to suppress the occurrence of spot-like blackening of the fluorescent film 5. That is, since the impedance between the filament coil 6 and the conductive coating 2 at the time of starting the discharge can be made smaller compared to the case where the protective film 3 is interposed, the impedance between the filament coil 6 and the conductive film 2 at the time of starting the discharge can be made smaller. By reducing the potential difference generated between the mercury and the conductive film 2, it is possible to reduce the amount of slight discharge between the liquefied and agglomerated mercury and the conductive film 2. Therefore, spotty blackening of the fluorescent film due to mercury adhering to the glass tube 1 can be prevented.

Further, the heat generated in the filament coil 6 when the rapid start type fluorescent lamp 11b is turned on is discharged through the exhaust pipe 1 provided at the sealed end 16 of the glass tube body 1.
5 to the filling material 17 around the exhaust pipe 15, and is further radiated to the outside via the cap 9. For this reason,
A rise in temperature at the end of the exhaust pipe 15 can be suppressed.

[0033] This rapid start type fluorescent lamp 11b
Table 1 shows the relationship between the ambient temperature and the temperature at the end of the exhaust pipe 15 when the lamp is turned on.
Example a using a metal cap 9, Example b using a metal cap 9,
FIG. 9 shows the relationship between the ambient temperature at the time of lighting and the temperature at the end of the exhaust pipe 15 in Comparative Example (3) in which the filler 17 is not filled around the sealed exhaust pipe 15. Note that a straight line I in FIG. 9 indicates the temperature at the center of the glass tube 1 when the rapid start type fluorescent lamp 11b is turned on.

[0034]

[Table 1]

From FIG. 9, it can be seen that in Comparative Example (2), the temperature at the end of the exhaust pipe 15 is higher than the temperature at the center. On the other hand, the rapid start type fluorescent lamp 11b of this embodiment
Since the heat generated in the filament coil 6 is radiated, the temperature at the end of the exhaust pipe 15 is about 25°C in Example a and about 25°C in Example B compared to the temperature in the center of the glass tube body 1. The temperature decreases by about 30°C. Therefore, in the rapid start type fluorescent lamps 11b of Examples a and B, the coldest part of the glass tube body 1 is the end of the exhaust pipe 15. Therefore, comparative example ■ is
The mercury vapor pressure is controlled by the temperature of the central part of the glass tube 1 which is the coldest part, whereas in Example a and Example B, the mercury vapor pressure is controlled by the temperature of the coldest part of the glass tube 1. exhaust pipe 15
Controlled by end temperature.

Therefore, at room temperature where the ambient temperature is approximately 25° C., in this rapid start type fluorescent lamp 11b, the temperature at the end of the exhaust pipe 15, which is the coldest part of the glass tube body, is 40° C. as shown in FIG. Therefore, as shown in FIG. 10, the luminous flux emitted from the rapid start type fluorescent lamp 11b is approximately maximum at an ambient temperature of 25° C., which is considered as normal temperature, in Examples a and B. Even if there is a slight increase in the luminous flux, there is hardly any decrease in the luminous flux.

In this way, the exhaust pipe 1 housed in the base 9
By simply filling the filler 17 around the fluorescent lamp 5, the high luminous efficiency of the rapid start type fluorescent lamp 11b can be maintained.

FIG. 11 shows the relationship between the length L of the exhaust pipe 15 from the sealed end 16 and the temperature at the end of the exhaust pipe 15.

As can be seen from FIG. 11, the exhaust pipe 15
If the length L is less than 10 mm, the temperature at the end of the exhaust pipe 15 will rise to 45° C. or higher, making it difficult for the heat generated in the filament coil 6 to be radiated through the filler 17 and the cap 9. For this reason, the temperature at the end of the exhaust pipe 15 becomes high, which causes a decrease in the luminous efficiency of the rapid-start type fluorescent lamp 11b, making it unsuitable.

Furthermore, if the length L of the exhaust pipe 15 exceeds 15 mm, the rapid start type fluorescent lamp 11
This is unsuitable because it shortens the effective light emitting length of b and furthermore, it becomes impossible to fix the cap 9 to the sealing end 16.

[0041]

Effects of the Invention According to the rapid start type fluorescent lamp of the present invention, since a protective film made of a metal oxide is interposed between the conductive film and the fluorescent film, chemical changes in the conductive film can be avoided. This can prevent the conductive coating from yellowing. In addition, when this lamp is lit, there is no protective film intervening between the conductive film and the fluorescent film at the cutout part of the protective film, so a phenomenon occurs between the filament coil and the conductive film when the discharge starts. By reducing the potential difference and reducing the amount of micro-discharge between the liquefied and agglomerated mercury and the conductive coating,
It is presumed that the occurrence of blackening of the fluorescent film can be suppressed. Therefore, both the blackening of the fluorescent film and the yellowing of the conductive film can be suppressed.

[Brief explanation of drawings]

FIG. 1: The first rapid-start type fluorescent lamp of the present invention.
It is an explanatory view showing an example of this and explaining a notch part.

FIG. 2 is an explanatory diagram illustrating another notch portion similar to the above.

FIG. 3 is an explanatory diagram illustrating another notch portion similar to the above.

FIG. 4 is an explanatory diagram illustrating another notch portion similar to the above.

FIG. 5 is a sectional view of the same glass tube body.

FIG. 6 is a graph showing the relationship between the film thickness of the same protective film and the yellowing evaluation score.

FIG. 7 is a graph showing the relationship between the area of the cutout portion and the blackening evaluation score.

FIG. 8 is a sectional view of an end portion of a rapid start type fluorescent lamp showing a second embodiment of the present invention.

FIG. 9 is a graph showing the relationship between the ambient temperature and the temperature at the end of the exhaust pipe.

FIG. 10 is a graph showing the relationship between the ambient temperature and the emitted light flux.

FIG. 11 is a graph showing the relationship between the length of the exhaust pipe from the sealed end and the temperature at the end of the exhaust pipe.

[Explanation of symbols]

1 Glass tube body 2 Conductive film 3 Protective film 4 Notch part 5. Fluorescent film

Claims (1)

[Claims] 1. A rapid start type fluorescent lamp in which a protective film made of a metal oxide is interposed between a conductive film laminated on the inner surface of a glass tube and a fluorescent film, the protective film comprising: 1. A rapid start type fluorescent lamp, characterized in that a notch is provided, and the conductive film and the fluorescent film are laminated in the notch without interposing the protective film.