JPS58121544A - Low pressure discharge lamp - Google Patents

Abstract

PURPOSE:To form an electric discharge lamp to small size and light weight further with excellent convenience of use, by preventing a start characteristic of the lamp from worsening and simplifying a countermeasure of heat for a current limiting resistor. CONSTITUTION:An electric lamp-shaped current limiting resistor 10 tensibly linked with a filament coil 12 in an internally vacuumized glass tube 11 is electrically connected to the ends of a set of lead-in wires 13, 14 sealed up to a base plate 2 while fixedly positioned in an outer tube 1 by said wires 13, 14. While this resistor 10 is connected to one electrode 3 and power source through the other ends of the wires 13, 14 in such a manner as to be in a series relation to an electric discharge path. The numeral 15 is a conductive material-auxiliary pole sealed to the plate 2 and protruded with the point end to an intermediate part connecting opening ends 7, 8 of each inner tube 6, the numeral 16 is a high resistor connected with one end to the other end side of this auxiliary pole 15 while connected with the other end to a power source side of said resistor 10, and the numeral 17 is a glow starter connected between said both electrodes 3, 4 so as to be in parallel to the electric discharge path, then this glow starter 17 is accommodated in a base 9 with said resistor 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for disposing a pair of electrodes in a discharge space formed by an outer tube, and two inner tubes having one end containing the electrode and the other end opening into the discharge space. The present invention relates to a low-pressure discharge lamp equipped with a low-pressure discharge lamp.

An example of this type is disclosed in Japanese Patent Application Laid-Open No. 54-44370. Figure 1 shows the Japanese Patent Application Publication No. 1973-
FIG. 4 is a perspective view showing a discharge lamp described in Publication No. 44370. That is, in FIG. 1, (1) is an outer tube whose bottom opening is closed with a substrate (2) to form a sealed discharge space inside.

And the first electrode (3) disposed inside this outer tube (+1)
is enclosed in an airtight manner at one end of the U-shaped first inner tube (5), and the second electrode (4) is enclosed in an airtight manner at one end of the U-shaped second inner tube (6). , first and second inner tubes (5)
, (6) The other end is an open end (7) that is open into the discharge space.
1, (8). Reference numeral (9) denotes a cap fixed to the bottom of the outer tube (1), in which a glow starter and an inductive ballast (both not shown) are arranged. By adopting this configuration, the discharge lamp can be made smaller.

It can be used in sockets for natural light bulbs for general lighting.

However, in order to use discharge lamps as a substitute for incandescent light bulbs, miniaturization and weight reduction of the discharge lamp itself are essential factors, but in the conventional configuration described above, inductive stability is Since a container is used, it is not always satisfactory in terms of weight reduction. Therefore, it may be possible to use other current limiting elements such as resistors or capacitors instead of the inductive ballast to reduce the weight. However, in this case, the generation of induction kick pressure due to the operation of the glow starter cannot be expected, so the starting characteristics of the discharge lamp become extremely poor. Furthermore, when a resistor is used as a current-limiting element, there are drawbacks such as complicated countermeasures against the heat generated by the power dissipated by the resistor and a large number of restrictions on use. is expected.

This invention was made in view of the above points.

Two inner tubes each containing an electrode at one end and having an open tip are disposed within an outer tube, and a discharge path is formed in a discharge space within the outer tube through the open end of the inner tube.

A current-limiting resistor connected to at least one of the electrodes is disposed inside the outer tube, and an auxiliary electrode connected to the power supply side of the current-limiting resistor via a high-resistance element is protruded into the inner tube. The object of the present invention is to provide a low-pressure discharge lamp that is compact, lightweight, and easy to use, in which heat countermeasures for a single current-limiting resistor are simplified without impairing the starting characteristics of the lamp.

An embodiment of the present invention will be described below with reference to FIG.

In the figures, (1) to (9) are the same reference numerals as those shown in FIG. 1 to indicate the same or corresponding parts, and these are as described above. The decoy is a light bulb-shaped current-limiting resistor with a filament coil (1 wire) stretched in a glass tube I with a vacuum inside. It is electrically connected and fixed in position within the outer tube (1) by its lead-in wire 0.α→.

Further, this current-limiting resistor αe is connected to one electrode (3) and the power source via the lead-in line a and the other end of the a station so as to be in series with the discharge path. Q is the board (2
) and its tip is sealed to the open end (7) of the tube (6).
).

(8) An auxiliary pole made of a conductor protruding from the middle part connecting the two.

One end is connected to this auxiliary pole (151), and the other end is a high resistance connected to the power supply side of the current limiting resistor 0, and +17+ is connected in parallel to the discharge path. .

The above-mentioned two electrodes (31, (a glow starter connected between 41, this glow star aγ) are housed in the base (9) together with the resistor aQ.

Next, the operation of the low pressure discharge lamp of the above embodiment will be described. When the power supply voltage is applied to the glow starter (171), the glow starter a'0 opens the preheating circuit with the electrodes (31, (4) sufficiently preheated. At this moment, for convenience, the auxiliary electrode (
When the electrode (3) to which 151 is connected has a positive potential, a power supply voltage is applied between the auxiliary electrode α9 and the other electrode (4) with the auxiliary electrode α9 serving as the anode and the electrode (4) serving as the cathode. be done. In other words, since an extremely high potential gradient is formed between the auxiliary electrode (L5 and the other electrode (4) compared to that of the two electrodes f3) and +4), the potential gradient between the other electrode (4) and the auxiliary electrode α is Insulation breakdown easily occurs due to power supply voltage. Subsequently, this dielectric breakdown causes dielectric breakdown between one electrode (3) and the auxiliary electrode 01, which causes both electrodes (3),
During (4), regular discharge occurs and the discharge lamp lights up.

At this time, the current flowing through the auxiliary pole α1 is regulated by the resistor αQ and is extremely small.

On the other hand, since the current-limiting resistor (111) is located in the discharge space inside the outer tube (1), the heat generated by the current-limiting resistor 0I is absorbed into the outer tube along with the light emitted through the outer tube (1). (
1) Heat is easily dissipated into the free space outside.

Furthermore, since most of the power consumed by the current limiting resistor a1 is converted into light, the effect of increasing the light output of the discharge lamp can be expected.

Table 1 shows a comparison of the starting characteristics and weight of the product of the present invention and the conventional product. Here, the specifications of the discharge lamp are: electrode distance 3005W, J-shaped tube length 105W, tube diameter 17=, sealed argon gas pressure 3.5Torro. It can be seen that both characteristics are satisfied at the same time.

As explained above, according to the present invention, in a structure in which two inner tubes with electrodes sealed at one end and open at the other end are disposed inside the outer tube, the current limiting resistor and the current limiting resistor are An auxiliary electrode connected through a resistor is provided inside the outer bulb, so even if a resistor type ballast is used instead of a conventional inductive ballast, complicated heat measures for the ballast can be avoided, and it is also possible to use a discharge lamp. It also does not impair the starting characteristics of the engine. Therefore, it is possible to provide a low-pressure discharge lamp that is small, lightweight, and easy to use.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional low-pressure discharge lamp, and FIG. 2 is an exploded perspective view showing an embodiment of the present invention. In the figure, (1) is the outer tube, (2) is the substrate, (3), (4)
is an electrode, (5). (6) is the inner tube, (71, (8) is the open end, (I(l
is a current limiting resistor. Q51 is an auxiliary pole, α6) is a high resistance element. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2

Claims (1)

[Claims] (11) An outer tube with an open bottom in which rare gas and mercury are sealed; a substrate sealed to cover the opening of the outer tube; and a substrate sealed to the substrate and disposed within the outer tube. a pair of electrodes disposed within the outer tube and curved within the tip of the outer tube, one end of which is fixed to the substrate and encloses the electrode in an airtight manner;
and two inner tubes having an opening between the curved portion and the substrate at the other end and having a phosphor layer formed on the inner surface. A current-limiting resistor disposed within the outer tube and connected to at least one of the electrodes, hermetically sealed to the substrate, with one end located midway between the openings of the respective inner tubes, and the other end located at a high or low level. A low-pressure discharge lamp comprising an auxiliary electrode formed of a conductor connected to the power source side of the current-limiting resistor through an antibody. (2) The low-pressure discharge lamp according to claim 1, wherein the current-limiting resistor is in the shape of a light bulb with a filament coil stretched inside a glass container.