JP3467477B2 - Ring fluorescent lamp - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a brightness improving lit that piece cap fluorescent lamp in an atmosphere for example of a high ambient temperature, such as closed luminaires. 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. Accordingly, an object of the present invention without increasing the lamp cost, moreover intended to provide a single die type fluorescent lamp lighting apparatus that can improve brightness even exceed 30 ° C. ambient temperature without deteriorating the starting characteristic Is.

[0004]

The single base form fluorescent lamp fluorescent lamp lighting apparatus according to the present invention the ambient temperature is in excess of 30 ° C. Means for Solving the Problems], with lights at high frequencies above 35 KHz, and penetrating through the lamp base opening Parts are provided. Also, the openings are formed as a plurality of holes independent of each other. Further, the opening is configured to have an opening ratio of 5% or more.

[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, it is smaller than in commercial frequency lighting, and therefore the amount of heat generated in the electrode part is smaller and the temperature of the lamp tube surface on the side opposite to the discharge path tends to be lower than that of the electrode, but at commercial frequency the heat generated at the electrode is relatively large, Therefore, it is presumed that the temperature of the lamp tube wall on the side opposite to the discharge path is also high, the cooling is not sufficiently performed even when the present invention is used, and as a result, the temperature does not drop 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. In a lamp with a tube wall load less than a specified value , the heat generated at the electrode part does not change much compared to a lamp with a tube wall load above a specified value, but the lamp body (discharge path section)
Since the heat generation of the lamp is small, the temperature of the lamp body is low, and as a result, the temperature of the coldest point is also low.
The coldest spot does not move (the temperature is lower behind the electrode). The lamp starting characteristics are such that when the ring fluorescent lamp of the above-mentioned embodiment and the conventional ring fluorescent lamp are lit by a lighting circuit having a lighting frequency of 40 KHz, the starting voltages are all 84-.
It was 86 V, and there was no difference between the two. 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 of the present embodiment, and for example, those shown in FIGS. 6 to 8 can be appropriately selected. 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
Illuminates more frequency 5 KHz, and to the base, by providing an opening through the mouthpiece and out, the cold spot moves to the cap, since the temperature of lower than conventional single ferrule type fluorescent lamps, the amalgam The mercury vapor pressure is suppressed without using, and the brightness can be improved even when the ambient temperature is 30 ° C. or higher without increasing the cost or deteriorating the starting characteristics. 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. Further, since the openings are formed of a plurality of holes independent of each other, it is possible to prevent the lowering of the strength of the base and the exposure of the charging part while ensuring the formation of the coldest spot at a desired position. 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 tube wall temperature distribution chart 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 temperature characteristic 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.

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 5/50 H01J 61/52

Claims (8)

(57) [Claims] 1. Attached to an end of a lamp tube of an annular fluorescent lamp
A ring-shaped fluorescent lamp characterized in that an opening penetrating inside and outside of the base is provided in the base in which the base pin is planted . 2. The ring-shaped fluorescent lamp according to claim 1, wherein the opening has a plurality of lattice-shaped holes that are independent of each other. 3. The ring fluorescent lamp according to claim 1, wherein the aperture ratio of the opening is 5% or more. 4. The ring-shaped fluorescent lamp has a ring-shaped bulb having an end, the base is a base bridging both ends of the bulb, and the openings are provided at at least two locations corresponding to both ends of the bulb. The ring-shaped fluorescent lamp according to claim 1, wherein the ring-shaped fluorescent lamp is provided. 5. The base has a cylindrical shape including an upper body and a lower body, an opening is formed in the upper body, and a base pin is implanted in the lower body. Item 1. The ring-shaped fluorescent lamp according to item 1. 6. The ring-shaped fluorescent lamp has a bulb having electrodes at its ends to form a discharge path between the electrodes, the base is a base bridging both ends of the bulb, and the opening is inside the base. An opening that dissipates the heat generated from the end of the bulb and moves the coldest point of the lamp that can be located anywhere on the discharge path side to the end of the bulb in the base on the side opposite the discharge path if there is no opening The ring-shaped fluorescent lamp according to claim 1, which is a part. 7. The ring-shaped fluorescent lamp has a bulb whose end is covered with a base, and the opening radiates heat generated from the end of the bulb inside the base and emits light inside the base to the outside. The ring-shaped fluorescent lamp according to claim 1, wherein: 8. The ring fluorescent lamp according to claim 1, wherein the ring fluorescent lamp has a maximum luminous flux when the ambient temperature during lighting is 35 ° C.