JPS593862A - Low pressure electric discharge lamp - Google Patents

Abstract

PURPOSE:To provide a small low pressure electric discharge lamp which is designed to be small but highly efficient, has a good charcteristic and a long life, and has an electrode structure and conveniently. CONSTITUTION:A hot spot (H) is formed at the nearest part to a power source (Vs) within the range coated with electrode matter. Electrons flowing in from the pointed end of a sealed wire 4 at the anodic cycle, flows through filaments 6 which are connected to the power source (Vs). Therefore, irrespective of the connection of an external circuit, the filament 6 provided with the hot spot (H) works as an electron path at the anodic cycle, and compensates the reduction of spot temperature. As a result, any adverse effects on the efficiency and the life which conventionally were caused according to the connective condition with the external circuit, don't develop. Consequently, the conventional problem that the characteristic and the life very according to the connective condition with the external circuit is resolved, the best operation is achieved in any connective condition, and a characteristic almost equal to that realized with the usual filament is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low pressure discharge lamp, such as a fluorescent lamp.

Conventionally, there have been lamps with a tube diameter narrower than usual as lamps aimed at increasing efficiency by a small m% or for decoration in stores, etc., and an example thereof is shown in FIG.

In such a lamp, Vi and tW are different from normal ones, and the filament is connected in the same direction as the discharge path, making it possible to form a thin tube structurally. However, the following problems occur during lighting.

As shown in Fig. 1, the filament #! is supported on the discharge path side from the filament l. Because of the presence of #2, support #2 becomes a long anode during the positive cycle, and ion bombardment against the hot spots formed on the filament L is almost eliminated, bringing the hot spot temperature to an appropriate temperature for electron emission. Can not do it. Therefore, the voltage drop in the canister is reduced, resulting in negative effects such as lower dynamic rate and shorter lifespan than ordinary filaments.

However, as a result of experiments as described below, it has been found that even with a lamp having the electrode structure as described above, characteristics and life comparable to those of a lamp having a normal electrode structure can be achieved.

When lighting the above-mentioned fluorescent rung with a lighting circuit, eight types of modes (Oo) shown in Fig. 2 1al to fc can be considered depending on the connection method. a), mode (bl, q=-
We will now discuss the experimental results using (referred to as (c)). In addition.

The rung used in the experiment was a tOW type fluorescent tube with a tFM distance of about 256 mm, a tube diameter of about 25 g, and argon (Ar) as an inert gas. g Torr, and measurements were taken at 100V after 100 hours of aging.
It was lit using the same choke coil L with the AC power source v9.

The table below shows the measurement results for each mode f@), fb), and tel, and the values in Table 1 are the average values of the measured values of six rungs.

Still about 1000 hours, mode (凰) and mode TC)
When turned on in the condition, the luminous flux deterioration is 84.7% in mode (11) and tl 91.4 in -T need + C
%, tE electrode material decrease ih, mode lal t:
It was found that it was about 2.5 times that of t mode (C).

As described above, it is clear that the mode fc) is superior in terms of characteristics, luminous flux deterioration, and blue-gold.The reason for this phenomenon is thought to be as follows.

In the case of the left minister in mode (a) and mode (b), the source v11 is connected to the tip side of fiwoment 1 (i.e., the side far from the tube end), and the anode cycle of fiwoment 1 is considered. If the city is in the discharge space.

Since the anode flows into a portion close to the other electrode and having low resistance to the power source v8, the anode essentially becomes the tip A of the support wire 2, as shown in FIG.

In other words, if you take a route as shown by arrow line B in Figure 8,
The VJL style flows through the streets. In addition, in the cathode cycle, point A, which is different from filament L, acts as an anode.
The temperature of the hot spot will drop, leading to greater market and sales losses. As a result, in terms of characteristics, the efficiency [im/~V] increases, and the scattering and evaporation of the electrolyte material increases, reducing luminous flux deterioration and shortening the lifespan.

On the other hand, for the right electrode in mode Ic) and mode fb).

+liFor the same reason as described in J, even if the tip A of the support wire 2 becomes an anode, the current flows through the filament 1 as shown by the arrow line in Fig. 4, and the temperature drop in the hot spot is guaranteed. Therefore, the temperature drop is small. Therefore, the tFM loss is smaller than in the above case, which is considered to be the result of the above.

In this way, it has become clear that mode fc) is the best lighting condition, but it is impossible to manage it so that it is in mode tc) in actual use! 3) if
For example, even if the connection status was displayed, it was unavoidable to impose a heavy burden on the user.

The present invention was made in view of the above points, and its purpose is to provide a low-pressure discharge lamp with a small tube diameter due to miniaturization and high efficiency, to have good θr in both characteristics and life, and to be easy to use. Niami provides a low-pressure discharge lamp with an electrode groove structure.

Hereinafter, the present invention will be explained based on examples. FIG. 5 is a diagram showing the fluorescent rung according to the present invention together with a lighting circuit. To explain only the configuration different from the conventional example, the electrodes include two external circuit connection encapsulated wires 4 whose one end is encapsulated in the Nudem 8, 4
It is composed of two filaments 6, the other end of which is connected to the support wire 5 which is insulated with the elbow entry wire 4.4 enclosed in the Nudem 8, and both filaments 6° 4ff so that 6 is in the same direction as the tube axis direction of glass tube 7.
7 has been completed. Of course, the filament 6.6 is coated with an electrode material.

When a low-pressure discharge lamp with such a configuration is used, unlike the conventional one, the filament structure is symmetrical, so the connection state I''i with the external circuit is substantially only as shown in FIG. 6. FIGS. 6 and 7 The figure shows the formation position of the hot spot depending on the illumination connection state and the movement path of the iK element during the anode cycle for one pole.

H is the area where the electrode material is applied and is formed at 1j(f), which is the closest to the source Vs, and the source Vs which flows from the tip of the enclosed wire 4 in the anode cycle.
Flows through filament 6 connected to.

Therefore, irrespective of the connection to the external circuit, the potential 6 in which the hole holder 6 is formed serves as a path for electrons in the anode cycle, thereby compensating for the drop in spot temperature. In other words, the operating state is the same as the normal pressure M mode (c), and the adverse effect on efficiency and 5V life caused by the connection state with the external circuit disappears.

1', J, As a result of the above, the problem of the conventional problem that the characteristics and lifespan differed depending on the connection with the external circuit has been solved, and it has the best operation in any connection state, and has almost the same characteristics as a normal filament. was gotten.

Furthermore, there are two additional effects:

First, this narrow W, pole was applied to a rung with a smaller tube diameter than usual, and the thin tube rung was turned on with alternating current using a galvanic ballast and a voltage-activated starting device NS such as a glow starter. In this case, the rung voltage waveform is compared to the rung with a normal pipe diameter as shown by the dashed line in FIG.

The phenomenon that the restriking voltage increases is unavoidable. Normally, in such a lighting circuit, the power supply voltage VmO is selected to be approximately twice the positive voltage, and is comprised of a starter S with an operating voltage suitable for the power supply voltage Vs, and a stabilizer determined by the lighting conditions. However, when the restriking voltage becomes high in this way, the f source voltage vs and the restriking voltage become close to each other, making it extremely difficult to set the operating voltage of the starter S.
The power supply voltage Vs must be set much higher than normal, and the volume, power, and loss of the ballast must be increased.

However, by using the vL birch of the present invention, the circuit Vi
Substantially, as shown in FIG. 9, a resistor r is inserted on the starter S side, and malfunction of the starter S due to the restriking voltage portion is alleviated. In other words, the rung pressure is divided by the filament resistor rK on the starter S side, which has the effect of suppressing the voltage applied to the starter S to a low level. Therefore, the starter malfunction during lighting, which is often seen in capillary tube rungs, can be prevented under conditions that are almost the same as the settings of the power supply voltage vI and the operating voltage of the starter S for a normal low-pressure discharge rung.

Another effect is that by using two filaments 6, the rung life is extended. Only one filament 6 of the three filaments 6 shown in FIG. It stuck to me! The lifespan is extended by the amount of polar material, resulting in a longer lifespan compared to conventional ones. t, power supply v8 at an appropriate time
In this case, by changing the direction of the connection, the lighting can be continued while maintaining good a-effect.

The lifespan is about twice that of conventional models.

Fig. 1O shows a different embodiment of the present invention, in which two inner tubes are bent into a U-shape in a discharge space 9 which is kept airtight by an outer tube 7 and a stem (button stem) 8. 1
This is a small fluorescent rung that houses 0. The inner surface of the U-shaped inner surface 1t10 is coated with a fluorescent material (■).

Also, one end of the inner tube 10 is airtightly fixed around the electric FM minor by glass welding, and both [FM
L! ,L! A discharge occurs between the two. 14 d lighting device section; 15 is a screw cap;

In such a small-sized rung, the inner tube 10 can be made smaller and more efficient, and this is one of the preferred embodiments of the present invention.

As described above, in the low-pressure discharge lamp having a glass tube for limiting the discharge path and a pair of 'Fit electrodes at both ends of the discharge path, at least one of the two electrodes is connected to It consists of two wooden buoyments, one end of which is connected to two external circuit connection enclosed wires enclosed in the stem, and the other end connected to a support wire that is enclosed in the stem and insulated from the elbow insertion wires. , and both filaments are arranged in the same direction as the direction of the discharge path,
Hoya.

With the trend toward higher efficiency, we have been able to provide a discharge lamp that has good characteristics and service life, and is convenient to use, even for low-pressure discharge lamps that have glass tubes with narrow tube diameters.

[Brief explanation of drawings]

Figure 1 is a front view of the conventional example, Figure 2 ti), Ib)
, (c) Vi A diagram showing the connection mode between the rung and the lighting circuit same as above, FIG. 8 and FIG. 4 are diagrams explaining the operation during lighting in the same connection mode as above, and FIG. FIGS. 6 and 7 are diagrams illustrating the operation of the above rung at the time of lighting, FIG.
The figure is an equivalent circuit diagram when the light bulb of the present invention is lit.
Figure O is a perspective view showing a different embodiment of the present invention. Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (and 2 others) Figure 2 Figure 6 Figure 7 Figure 9 Figure 10

Claims (1)

[Claims] (1) In a low-pressure discharge lamp having a glass tube for limiting the discharge path and a pair of electrodes at both ends of the discharge path, at least one of the two electrodes is enclosed in eight tubes, one end of which is enclosed in the stem. It is composed of two filaments connected to the enclosed wire for external circuit connection, and the other end is connected to the support wire, which is enclosed in the stem and insulated from the enclosed wire, and both core filaments are connected to the discharge wire. A low-pressure discharge lamp characterized in that it is configured to be oriented in the same direction as the road.