JPH08241669A - Single-side base type fluorescent lamp lighting device - Google Patents

Abstract

PURPOSE: To suppress the mercury vapor pressure with no use of amalgam and enhance the lightness by lighting the lamp with a high frequency, and furnishing an opening penetrating from the outside to inside of a lamp base. CONSTITUTION: A glass bulb 1 is fitted with a lamp base 2 which bridges the two ends of the bulb. The lamp base 2 is made of polycarbonate and has an upper body part 2a and lower body part 2b formed in a cylinder. Four base pins 3 are implanted in the lower body part 2b and connected with leads, not illustrated, which are led out of an electrode 4. The upper body part 2a is furnished with an opening 5 bored in the form of a lattice. When this annular fluorescent lamp is lighted up using a high frequency lighting fixture, current is fed to the coil part of the electrode 4, and electric discharge is commenced between it and the other electrode. At this time the inside of the lamp is heated, and encapsulated mercury is vaporized, and the lamp is filled with a mercury vapor corresponding to its coldest point of temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube wall load of 4 W which is turned on in an atmosphere having a high ambient temperature, such as a closed type lighting fixture.
The invention relates to improving the brightness of single-ended fluorescent lamps of / cm ² or more.
The single-ended metal fluorescent lamp used in the present invention means a ring fluorescent lamp, a compact fluorescent lamp, or the like.

[0002]

2. Description of the Related Art Various researches have been made on improving the brightness and efficiency of fluorescent lamps. For example, as for the lighting system, efficiency is improved by high-frequency lighting, as shown in ILL78, VOL78 No.4, 1994, "Main character of image change of fluorescent lamp-inverter-". On the other hand, it is known that the total luminous flux of a fluorescent lamp changes with the ambient temperature as shown in the Lighting Handbook, The Institute of Lighting, 1987. Normally, when the ambient temperature when the fluorescent lamp is lit is 25 ° C. , The brightest. This is because the mercury vapor pressure is determined by the coldest spot temperature of the fluorescent lamp, and it becomes dark when the coldest spot temperature is too low,
If it is too high, it will become dark due to self-absorption of mercury. As for the coldest spot temperature, as shown in Japanese Patent Application Laid-Open No. 4-298953, 40 ° C. is optimum for a fluorescent lamp,
At that time, the luminous efficiency becomes maximum. This coldest point is not normally controlled intentionally (artificially),
-298953 gazette, by using amalgam instead of pure water silver, the mercury vapor pressure characteristic of amalgam is lower than that of pure water silver. It is also known that when the temperature exceeds 40 ° C., it becomes brighter than pure silver.

[0003]

However, when amalgam is used, the cost is increased and the lamp starting characteristic is deteriorated. On the other hand, recently, a lot of hermetically-sealed appliances that cover the circumference of a fluorescent lamp with appliances have become widespread, and the ambient temperature during lighting of the lamp tends to be too high when viewed from the lamp. Therefore, the coldest spot temperature of the fluorescent lamp also becomes high, and the problem that the brightness decreases frequently unless special measures such as amalgam are taken, and it is possible to improve the brightness without increasing the lamp cost and deteriorating the starting characteristics. The emergence of new fluorescent lamps was strongly desired. Therefore, an object of the present invention is to increase the brightness of the tube wall load 4 without increasing the lamp cost and without deteriorating the starting characteristics even when the ambient temperature exceeds 30 ° C.
It is an object of the present invention to provide a single-ended fluorescent lamp lighting device having a W / cm ² or more.

[0004]

The fluorescent lamp lighting device according to the present invention has an ambient temperature exceeding 30 ° C. and a tube wall load of 4 W / c.
A single-ended metal fluorescent lamp of m ² or more is lit at a high frequency of 35 KHz or more, and an opening penetrating inside and outside is provided in the lamp base. Also, the openings are formed as a plurality of holes independent of each other. In addition, 5 openings
It is configured to have an aperture ratio of at least%.

[0005]

In the single-ended type fluorescent lamp lighting device of the present invention, it has been experimentally found that the coldest point moves to the lamp portion in the base and the temperature becomes lower than the coldest point temperature of the conventional fluorescent lamp. confirmed. Therefore, even if the ambient temperature exceeds 30 ° C, since the coldest spot temperature is low, the mercury vapor pressure is suppressed without the use of amalgam, so that the conventional single-ended die fluorescent light does not cause cost increase and start-up characteristic deterioration. Improve the brightness than the lamp. Moreover, since the opening is formed of a plurality of independent holes, it is possible to form an effective through hole as the opening while preventing the charging portion from being exposed and without significantly lowering the strength of the base. Furthermore, since the opening ratio of the opening is set to 5% or more, the coldest spot can be reliably formed in the lamp portion in the base.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on an embodiment shown in the drawings. FIG. 1A shows a ring-shaped fluorescent lamp (FCL3
It is a partial cross-sectional view of (0), in which 1 is a glass bulb. A phosphor coating (not shown) is applied to the inner surface of the glass bulb 1. The glass bulb 1 is filled with a predetermined amount of mercury and a rare gas such as argon. Further, an electrode 4 is provided inside the glass bulb 1, and the coil portion thereof is coated with an electron emitting substance such as Bao, SrO or CaO. At the end of the glass bulb 1, a mouthpiece 2 bridging both ends thereof is attached. The base 2 is made of polycarbonate, and has a cylindrical shape with a pair of upper body 2a and lower body 2b. Reference numeral 3 denotes four ferrule pins which are planted in the lower face body portion 2b of the ferrule,
It is connected to a lead wire (not shown) led out from the electrode 4. (B) is a partially enlarged cross-sectional view of the vicinity of the base 2 of (A), and 5 is an opening formed in the base body 2a of the base in a lattice shape. When the ring-shaped fluorescent lamp configured as described above is lit by the high-frequency lighting luminaire, the coil portion of the electrode 4 is energized, and the discharge with the other electrode is started. that time,
The interior of the lamp is heated, the enclosed mercury evaporates, and the interior of the lamp is filled with mercury vapor pressure that matches the coldest spot temperature of the fluorescent lamp. FIG. 2 shows tube wall temperature distributions when the ring-shaped fluorescent lamp (a) of this embodiment and the ring-shaped fluorescent lamp (b) of the related art having no opening are lit by a high-frequency lighting circuit of 40 KHz. The temperature measurement points of these lamps are shown in Fig. 3.
As shown in, the central part (pos.1) of the entire length of the lamp, the same quarter part (pos.2), and about 10 cm part from the tube end (po
s.3) and the pipe end (pos.4) located in the base. The coldest spot is pos.1 in the conventional ring-shaped fluorescent lamp, but the coldest spot is pos. 1 in the ring-shaped fluorescent lamp of the present embodiment.
Go to 4. The coldest spot temperature of the ring-shaped fluorescent lamp of this embodiment is about 10 ° C lower than the coldest spot temperature of the conventional ring-shaped fluorescent lamp. FIG. 4 shows the temperature characteristics of the example ring fluorescent lamp (a) of the present invention and the conventional ring fluorescent lamp (b). The brightness of the conventional ring-shaped fluorescent lamp is maximized at an ambient temperature of 25 ° C., and the brightness is reduced at a temperature higher than that. However, the ring fluorescent lamp of the present invention has an ambient temperature of 35.
Since the luminous flux becomes maximum when the temperature is ℃, it becomes brighter than the conventional ring fluorescent lamp at the ambient temperature of 30 ℃ or more. in this way,
When the ring-shaped fluorescent lamp of the present invention is lit by a high-frequency lighting luminaire, the coldest point that determines the brightness of the fluorescent lamp moves into the base, and the coldest point is reduced by 10 ° C. as compared with the conventional ring-shaped fluorescent lamp. Therefore, when the ambient temperature is 30 ° C. or higher, the brightness is improved as compared with the conventional product. However, when the ambient temperature during the lighting of the ring fluorescent lamp of the present invention is lower than 30 ° C., the coldest spot temperature becomes low and the mercury vapor pressure becomes too low, which has the opposite effect. Further, when the lamp is turned on by a magnetic circuit type ballast or the like, the coldest spot of the ring-shaped fluorescent lamp is at pos. 1 in FIG. 3, and even if the same base as the present invention is applied, the coldest spot does not move to pos. In addition, there is no change in the coldest spot temperature, and the effect cannot be obtained. The reason for this is that the lighting frequency of the above embodiment is 40 KH.
In z, the voltage drop of the electrode part is 50Hz (60H
z) and the like, which is smaller than that of commercial frequency lighting, and therefore the amount of heat generated in the electrode portion is smaller and the lamp surface temperature on the side opposite to the discharge path tends to be lower than that of the electrode. Therefore, it is presumed that the temperature of the lamp tube wall on the anti-discharge path side is also high, the cooling is not sufficiently performed even by using the present invention, and as a result, the temperature does not fall below the coldest point temperature when the present invention is not applied. As described above, in high-frequency lighting, the heat generation of the electrode portion is reduced, the effect of the present invention appears, and the effect does not appear at a commercial low frequency.
Whether or not this effect is possible, that is, the critical frequency with or without movement of the coldest spot was about 35 KHz. Therefore, in order to obtain the effect of the present invention, it is necessary to light at a frequency of 35 KHz or higher. For lamps with a tube wall load of less than 4 W / cm ² , the heat generated in the electrode part does not change much compared to lamps with a load of 4 W / cm ² or more, but the heat generated in the lamp body (discharge path) is small, so the lamp The temperature of the main body is low, and as a result, the temperature of the coldest spot is also low, and even when the configuration of the present invention is used, the coldest spot does not move (the temperature behind the electrode becomes lower). Regarding the lamp starting characteristics, when the ring fluorescent lamp of the above-mentioned embodiment and the conventional ring fluorescent lamp are lighted by a lighting circuit having a lighting frequency of 40 KHz, the starting voltages are all 84 to 86 V, and there is no difference between them. I couldn't do it. Moreover, the experimental result which changed the aperture ratio of the opening part is shown in FIG. The surface area of the base of the ring-shaped fluorescent lamp was 100%, and the aperture ratio was shown by the area ratio of the openings. The temperature drop when the die was not attached to the vertical shaft was set to 100%, and the temperature drop rate was shown as a relative value. As shown in the figure, the lowering temperature increases with the aperture ratio.
As is clear from the figure, the aperture ratio of the opening is preferably 5% or more. It should be noted that the shape and location of the opening of the die are not limited to those in this embodiment, and for example, those shown in FIGS. 6 to 8 can be selected as appropriate. By the way, although the FCL30 type ring fluorescent lamp has been described in the above embodiment, similar results were obtained with other watts and various light colors. Further, the present invention can be applied to a compact fluorescent lamp as shown in FIG.

[0007]

As described above, according to the present invention, 3
By illuminating at a high frequency of 5 KHz or more, and providing the base with an opening that penetrates the inside and outside of the base, the coldest point moves to the inside of the base, and the temperature is a single-sided mold with a conventional tube wall load of 4 W / cm ² Since it is lower than that of a fluorescent lamp, the mercury vapor pressure is suppressed without using an amalgam, and the brightness can be improved even when the ambient temperature is 30 ° C. or higher without inviting cost increase and starting characteristic deterioration. Furthermore, by providing an opening, the amount of material used can be reduced, cost can be reduced, and the light inside the base can be emitted from the opening to the outside, so the shadow of the base will not be conspicuous when used in a closed type lighting fixture. Ancillary effects such as improving the appearance can also be expected.
Also, because the opening is a plurality of holes independent of each other,
It is possible to prevent lowering of the die strength and exposure of the charged part while ensuring formation of the coldest spot at a desired location. Furthermore, by setting the opening ratio of the opening portion to 5% or more, there is an effect that the coldest portion can be reliably formed in the die.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a ring-shaped fluorescent lamp showing an embodiment of the present invention and a detailed view of a lamp cap portion.

FIG. 2 is a temperature characteristic diagram of the ring fluorescent lamp of the present invention and a conventional ring fluorescent lamp.

FIG. 3 is a diagram showing tube wall temperature measurement points of a ring-shaped fluorescent lamp.

FIG. 4 is a tube wall temperature distribution diagram of the ring fluorescent lamp of the present invention and a conventional ring fluorescent lamp.

FIG. 5 is a characteristic view of a base cover opening ratio and a relative decrease temperature of the ring fluorescent lamp of the present invention.

FIG. 6 is a perspective view of a base body having a base provided with an opening according to another embodiment of the present invention.

FIG. 7 is a perspective view of a cap upper surface body provided with an opening according to another embodiment of the present invention.

FIG. 8 is a perspective view of a cap upper surface body having an opening according to another embodiment of the present invention.

FIG. 9 is a front view showing an embodiment in which the present invention is applied to a compact fluorescent lamp.

[Explanation of symbols]

 1 glass bulb, 2 bases, 5 openings.

Claims (3)

[Claims] 1. A single-ended fluorescent lamp for lighting a single-ended fluorescent lamp at high frequency, wherein the ambient temperature during lighting of the lamp exceeds 30 ° C. and the tube wall load is 4 W / cm ² or more. In the lighting device, the high frequency is set to 35 KHz or more, and the base of the fluorescent lamp is provided with an opening penetrating inside and outside of the base. 2. The single-ended metal fluorescent lamp lighting device according to claim 1, wherein the opening is a plurality of holes independent of each other. 3. The single-ended fluorescent lamp lighting device according to claim 1, wherein the opening ratio of the opening is 5% or more.