JPS58121542A - Low pressure mercury vapor discharge lamp - Google Patents

Abstract

PURPOSE:To simplify a work process and improve workability in a low pressure mercury vapor discharge lamp having inner tubes which specify an electric discharge space to form a prescribed discharge path in an outer tube forming the electric discharge space. CONSTITUTION:The second inner tube 42 made of transparent glass, formed to an inverted cup shape, in which a diameter is larger than of the first inner tube 41 further a closed part 6 is formed in the point end side, is fixed to the peripheral part of the tube 41 located farthest from the other electrode 3 to form a space connecting the closed end part to a bottom opening 7 and eccentrically fixed in such a manner that an electric discharge path passing the opening 7 via the point end of the pipe 41 is formed in the inside of the space. A prescribed amount of mercury and rare gas is sealed in a space enclosed by an outer tube 1 and stem 5.

Description

[Detailed description of the invention] In this invention, a discharge space is formed within an outer tube.

The present invention relates to a low-pressure mercury vapor discharge lamp having an inner tube that regulates a discharge space so that a predetermined discharge path is formed.

An example of this genus electric lamp is proposed in Japanese Patent Laid-Open No. 54-44370. Figure 1 shows the discharge lamp, in which a pair of electrodes (3) are sealed to the bottom (2) of an outer bulb (1) that forms a discharge space, and one of the electrodes (3) has a In order to prevent a discharge short circuit with the other electrode (3),
An inner tube (4) bent into a U-shape surrounding the tube in an air-tight manner is provided, and one end of the opened leg (7) of the inner tube (4) is brought close to the other electrode (3).

The inner tube (4) forms a U-shaped discharge path.

A discharge lamp constructed in this way is disclosed in the above-mentioned Japanese Patent Application Laid-open No. 54-4.
As disclosed in No. 4370, for example, the electrode (31) has an opening (7) in one leg of the electrode (31).
It can be manufactured in a simple manner by arranging the U-shaped inner tubes (4) close to each other in the vicinity of the outer tube (4).
Even if 1) is relatively small and can be used in existing incandescent lamp sockets, it has the advantage of providing a discharge lamp that does not require a reduction in lamp efficiency.

However, since the inner tube (4) of the above-mentioned discharge lamp has a U-shape, it requires a bending process for the glass tube, making the first work process complicated. It was certainly not satisfactory.

The present invention has been made in view of the above-mentioned drawbacks, and includes an electrode sealed in an outer tube, which is surrounded in an airtight manner by a first inner tube having an open tip, and which is also provided with an inner tube inside the first inner tube. A second inner tube is provided at the open end to guide the stagnant discharge.

An object of the present invention is to provide a discharge lamp that simplifies the working process and improves workability.

An embodiment of the present invention will be described below with reference to FIG. In the figure, (1) has a dome-shaped tip and a bottom 1j (i
(21 is an open transparent glass outer tube, (5) is an outer tube that closes the bottom (2) of this outer tube (1) (IIK-sealed plate-like stem, (3) is an outer tube) (1) a pair of electrodes sealed to the stem (5) so as to protrude oppositely into the stem;
(41) is a linear inner tube made of transparent glass with openings at both ends, and one end is fixed with adhesive on the surface of the stem (5) with one of the electrodes (3) contained therein. .

In this identified state, an airtight state is maintained to the extent that no discharge short circuit occurs between the electrodes (3) via the fixed location. (421 is this first inner tube (4υ
The other electrode (
It is fixed with adhesive to the outer periphery of the first inner tube (40) which is farthest from the first inner tube (40), and there is an opening at the bottom (7
) is formed, and the first inner tube (II
It is fixed eccentrically so that a discharge path passing through the tip of υ and the opening (7) at the bottom is formed. (8) is the first
A predetermined amount of mercury and Enclosed with rare gas. (9) is a cap fixed to the bottom of the outer tube (1) and housing a ballast and a starting device (none of which are shown) inside, and can be installed in a socket for an incandescent light bulb.

In the discharge lamp configured in this way, there is a linear first inner tube (41) fixed to the stem (5) with its tip open, and this first inner tube (4]) f: A second inner pipe with an inverted top shape (combined with four pipes).

This is because a substantially U-shaped discharge path is formed.

Since no bending is required, the working process is simplified, and the first and second inner tubes 0υ, (42
) itself is much easier to handle during the manufacturing process than the U-shaped one. Furthermore, complicated manufacturing equipment for bending is no longer required.

Another advantage is that the work required to maintain and manage the equipment becomes simpler.

FIG. 3 shows another embodiment different from the above embodiment. That is, the first inner tube (41) and the second inner tube are configured so that a substantially U-shaped discharge path similar to that shown in FIG. 2 is formed in each of the two electrodes (3). A combination of inner tube (421) is installed.

And the second inner tube (421 openings (forces are brought close to each other) located near the electrode (3).

In the discharge lamp of this embodiment, the discharge occurs in the second inner tube (4
They are connected through the respective openings (7) of the outer tube (11) through the discharge space in the outer tube (11).In other words, two continuous approximately U-shaped pieces are connected at one end through the discharge space near the electrode (3). This results in the formation of a discharge path.

Therefore, even if the outer bulb shape is made compact, the desired discharge path length (distance between electrodes) can be obtained, so the lamp efficiency 'e[Ilt] will not be lowered. There is also a second inner tube (4
The closing portion (6) of 21 can be configured to have a wide area in the distal direction of the outer tube (1).

A phosphor layer (by 81K) applied to the closure (6).

It also has the effect of being able to irradiate a large amount of visible light toward the tip of the outer tube (1).

As explained above, the present invention has an inner tube for regulating a discharge path inside the outer tube, and the inner tube has a linear first tube.
an inner tube, and a second inner tube with an inverted top shape that houses the first inner tube, one end of the first inner tube encloses an electrode in an airtight manner, and the second inner tube Since the opening is located near the electrode, the process of bending the inner tube is not necessary, and therefore the process of manufacturing the discharge lamp is simplified, and it is possible to provide a low-pressure mercury vapor discharge lamp that can improve workability.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of a conventional low-pressure mercury vapor discharge lamp.
FIG. 2 is a partial J-plane view showing one embodiment of a low-pressure mercury vapor discharge lamp according to the present invention, and FIG. 3 is a partially cutaway perspective view showing another embodiment of the present invention. In the figure, (1) is the outer tube, (3) is the electrode, (7) is the opening,
(, 11) is the first inner tube, (44 is the second inner tube. The same reference numerals in each figure indicate the same or corresponding parts. Agent Shin Kuzuno - (7) Figure 1 Figure 2 Figure 3 figure

Claims (1)

[Scope of Claims] (+1 An outer tube made of a light-transmitting material with mercury and rare gas sealed inside, a pair of electrodes arranged at the bottom of the outer tube, one end of which connects one of the electrodes to the other electrode. A first inner tube with an open tip surrounded in an airtight manner, the first inner tube being installed so that a discharge space is formed within one end, and the other end being open in the vicinity of the electrode. A low-pressure mercury vapor discharge lamp comprising a second inner tube, wherein the discharge path passes through the first inner tube, the second inner tube, and then through the opening of the second inner tube. (2) A first inner tube is provided for each of the two electrodes, and a second inner tube is provided for each of the first inner tubes.A discharge path is provided at the opening of each of the second inner tubes. The first claim is characterized in that they communicate with each other.
Low-pressure mercury vapor discharge lamps as described in . (3) -g of the inner surface of at least the first inner tube and the second inner tube
2. The low-pressure mercury vapor discharge lamp according to claim 1, wherein A is provided with a phosphor layer.