JPS6362149A - Unilateral base type fluorescent lamp device - Google Patents

Abstract

PURPOSE:To suppress changes in characteristics such as lamp luminous flux in the lighting direction, by forming the coolest point on the tip of a glass tube opposite to an electrode and disposing an amalgam forming material in the vicinity of a one-sided electrode and using an amalgam forming material-side electrode as an anode and lighting the lamp in the form of a DC circuit or an AC circuit superposed by a DC circuit. CONSTITUTION:An amalgam forming material 25 is disposed in the vicinity 9 (on the base side) of a one-sided electrode of a luminous tube 23. Therefore, as if a temperature at the base-side end part rises excessively due to power dissipation of a lighting circuit at the time of lighting under the base, mercury vapor pressure of the amalgam forming material 25 becomes lower than that of a mercury unit so that a level of vapor pressure can be controlled within an appropriate range. When an electrode 9 on the side of the amalgam forming material 25 is used as an anode and the lamp is lighted in the form of a DC circuit or an AC circuit superposed by an DC circuit, a mercury cataphoresis phenomenon peculiar to the low-pressure mercury vapor discharge lamp can be suppressed so that miniaturization, compactness, and inexpensiveness for the circuit can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a single-capped fluorescent lamp device.

BACKGROUND OF THE INVENTION Recently, various compact fluorescent lamp devices have been developed and put into practical use as energy-saving light sources to replace incandescent light bulbs. FIG. 5 shows a typical lamp structure. Arc tube 1
, four straight glass tubes 2 to 5 parallel to each other are connected in series by three bridge parts 6 to 8 to form one discharge path, and electrodes 9 are attached to both ends of the glass tubes. ,1
0 is retained. Further, a phosphor film 11 is formed on the inner surface of the arc tube 1, and a rare gas such as mercury and argon is sealed therein at 3 to 4 Torr.

As a lamp device, a base 12 is attached to the electrode side end of the arc tube 1.
is provided.

The above lamp structure is characterized by the tips 1 of the glass tubes 2 to 5.
By separating 3 to 16 from the discharge path with a bridge structure,
The coldest point is formed in the tip portions 13 to 16 when the cap is lit. In other words, with this configuration, the mercury vapor pressure inside the tube when the lamp is lit on the base can be controlled within an appropriate range on the lamp luminous flux surface by the temperature at the tip. On the other hand, when the cap is lit, the temperature of the tips 13 to 16 rises, so that the cap side ends 17° 1 of the glass tubes 3 and 4 rise.
8 or the exhaust pipe 19, and the temperature of this coldest point controls the mercury vapor pressure within an appropriate range.

Problems to be Solved by the Invention The single-cap type fluorescent lamp device shown in FIG. 5 is assembled as a single lamp, but as shown in FIG. case 20
A fluorescent lamp device in which a lighting circuit 22 is provided is also being considered. By the way, in such a device, the temperature at the end of the arc tube 1 on the base side increases due to power loss in the lighting circuit.
It is not possible to form the coldest spot in this part.

In other words, in the case of lighting on the cap, the tip 13 of the arc tube 1 -
16 becomes the coldest point, and the mercury vapor pressure inside the tube is controlled within an appropriate range. However, in the case of lighting on the cap, an appropriate coldest point cannot be formed, so the mercury vapor pressure inside the tube increases excessively.

As a result, in the case of lighting on the cap, problems arise such as the luminous flux is lower than in the case of lighting on the cap.

Furthermore, in order to reduce the weight of the lamp device, for example, an electronic circuit may be used as the lighting circuit. However,
When electronic circuits conventionally used in fluorescent lamps are used, the problem remains that the circuit configuration is complicated, making it difficult to downsize and increasing costs.

Means for Solving the Problems In order to solve these problems, the single-capped fluorescent lamp device of the present invention is a light-emitting lamp device in which a plurality of glass tubes are connected in parallel to each other to form one discharge path. The glass tube is provided with a tube, electrodes are provided at both ends of the arc tube, a phosphor film is formed on the inner surface of the arc tube, mercury and rare gas are sealed in the arc tube, and the glass tube is on the opposite side from the electrodes. A coldest spot is formed at the tip, an amalgam-forming substance is provided near one of the electrodes, and the electrode on the side of the amalgam-forming substance is used as an anode to turn on a direct current or a superimposed direct current. be.

By providing an amalgam-forming substance near one electrode of the arc tube (on the cap side), even if the temperature at the cap side end increases excessively due to power loss in the lighting circuit when lighting on the cap, amalgam formation is prevented. Since the mercury vapor pressure of the substance is lower than that of mercury alone, the vapor pressure level can be controlled within an appropriate range. On the other hand, if the electrode on the amalgam-forming substance side is used as the anode and the lamp is lit with a direct current or a circuit that superimposes direct current, the cataphoresis phenomenon of mercury (mercury moves toward the cathode side and becomes ubiquitous), which is unique to abrasive pressure mercury vapor discharge lamps, occurs. This allows the circuit to be made smaller, lighter, and less expensive.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

The basic configuration of the fluorescent lamp device according to the embodiment of the present invention is the same as that shown in FIG. One of the features of this fluorescent lamp device is that an amalgam-forming substance 25 made of a B11n alloy or the like that forms amalgam with mercury is sealed inside the stem tube 24 behind one electrode 9 of the arc tube 23. This is because it is provided near one electrode 9. Another feature is that the lighting circuit 20 employs a DC lighting method shown in FIG. 2 or a DC superimposed lighting method shown in FIG. 3. In this case, the electrode 9 of the 25 amalgam-forming substances is connected to operate as an anode. However, in the DC superimposition type lighting circuit shown in Fig. 3, 1. A lamp current with a superimposed DC component as shown in FIG. 4 is flowing, and the electrode on the amalgam-forming substance side is selected as the anode from the DC component side. Table 1 summarizes other lamp specifications.

(Left below) Tables 1 and 2 compare the lamp characteristics when changing the lighting direction of the implemented lamp device with a built-in DC superposition lighting circuit with a fluorescent lamp device that does not include an amalgam-forming substance. and show.

Table 2 Notes (1) Lighting frequency 45 kHz C) All inputs are:
It is the sum of lamp input and lighting circuit loss. The lighting circuit loss is approximately 90% of the total input.

From Table 2, it can be seen that in the fluorescent lamp devices of the examples of the present invention, changes in the characteristics of the luminous flux depending on the lighting direction above and below the cap are significantly suppressed. - On the other hand, in a comparative fluorescent lamp device, as it ages, mercury moves from the superimposed DC component surface to the cathode side due to the cataphoresis phenomenon, becomes omnipresent and approaches the anode (as the total luminance decreases). On the other hand, it was also found that such cataphoresis phenomenon was suppressed in the fluorescent lamp device of the embodiment of the present invention.This is because mercury moved to the cathode side in the form of mercury ions due to so-called electrophoresis in the cataphoresis phenomenon. This is because mercury moves from the cathode side to the anode side where the amalgam-forming substance is present due to a diffusion phenomenon based on the difference in mercury density.

Furthermore, compared to the conventional bush-pull type high-frequency inverter system shown in Figure 7, the DC and DC superimposed lighting circuits shown in Figures 2 and 4 only use some transistors and do not require a power transformer. This makes it possible to make it simpler, smaller, lighter, and lower in cost.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention includes forming the coldest point at the tip of the glass tube on the opposite side of the electrode, providing an amalgam-forming substance near one electrode, and using the electrode on the side of the amalgam-forming substance as an anode. By lighting with direct current or superimposed direct current, it is possible to significantly suppress changes in characteristics such as lamp luminous flux depending on the lighting direction, and to provide a small, lightweight, and low-cost single-capped fluorescent lamp device. .

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the main parts of a single-capped fluorescent lamp device according to the present invention, FIG. 2 is a DC lighting circuit diagram, FIG. 3 is a DC superposition lighting circuit diagram, and FIG. Figure 4 is a discharge current waveform diagram when using the DC Tatami method, Figure 5 is a perspective view of a conventional single-cap fluorescent lamp device, Figure 6 is a perspective view of another conventional single-cap fluorescent lamp device, and Figure 7 The figure shows a conventional bushing.
FIG. 2 is a pull-type lighting circuit diagram. 2.3, 4.5...Glass tube, 6,7.8...
...Bridge part, 9, 10... Electrode, 15
, 16.17° 18...Tip, 23...
... Arc tube, 25 ... Amalgam-forming substance. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2 Figure 6

Claims (1)

[Claims] A discharge tube is provided in which a plurality of glass tubes are connected in parallel to each other to form one discharge path, electrodes are provided at both ends of the discharge tube, a phosphor film is formed on the inner surface of the discharge tube, and a discharge path is formed inside the discharge tube. mercury and a rare gas are sealed in the glass tube, and the coldest point is formed at the tip of the glass tube on the opposite side from the electrode, an amalgam-forming substance is provided near the one electrode, and the coldest spot is provided on the side of the amalgam-forming substance. A single-capped fluorescent lamp device characterized by lighting with direct current or superimposed direct current using an electrode as an anode.