JPS61190843A - Multi-electrode low-pressure mercury vapor discharge lamp - Google Patents

Abstract

PURPOSE:To easily control the temperature of a lowest-temperature section to a desired level, by providing cylindrical attaching portions protruded from the outside surface of a mounting plate which supports electrodes, and by providing stems in which electrodes are planted and which are sealed on the attaching portions. CONSTITUTION:The open end of an outer tube 10, in which hydrogen, rare gas, etc. are sealed, is closed by a mounting plate 11. A central electrode 20, a plurality of electrodes 30, which are disposed around the central electrode, and a cylindrical partitioning member 15, which serves to define a discharge path, are attached to the plate 11 so that a multi-electrode low-pressure mercury vapor discharge lamp is constructed. At that time, cylindrical attaching portions 27, 37 protruded from the outside surface of the mounting plate 11 are provided in positions corresponding to those of the electrodes 20, 30. The flare-shaped portions 24, 34 of stem 25, 35, in which the electrodes 20, 30 are planted, are sealed on the open ends of the cylindrical attaching portions 27, 37 so that the sealed ends of the attaching portions are lowest- temperature sections. Since these sections are located away from a discharge space, the temperature of each of the sections can be easily controlled to a desired level.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a multi-pole low-pressure mercury vapor discharge lamp in which a discharge path is selectively formed between one electrode and a plurality of other electrodes. Regarding.

[Technical background of the invention]

In a conventional multi-pole low-pressure mercury vapor discharge lamp, for example, as shown in FIG. ing. Furthermore, mercury and a rare gas such as argon are sealed inside the outer tube 1, and a phosphor is coated on the inner surface. The cathode 2 and the anode 3 are partitioned by the cylindrical partition 5, thereby forming a detoured discharge path, that is, a U-shaped bent discharge path. Furthermore, a high frequency switching circuit 6 is connected to each anode 3 as illustrated in FIG. 6, and by sequentially switching the anodes 3, multiple arcs are sequentially formed between the cathode 2 and the anode 3. It has become so. The cathode 2 and anode 3 are implanted in the substrate 8 by integrally sealing the support portions 2a and 3a, which also serve as conductive wires, into a flat substrate 8 that closes the end opening of the outer tube 1. ing.

This type of discharge lamp has the advantage that the area of the tube wall exposed to the discharge space can be increased, so that the load input can be increased and the light output can be increased by increasing the output.

[Problems with background technology]

However, in discharge lamps, the temperature of the coldest part is important because it affects the vapor pressure of the filled gas, and in the case of the conventional products mentioned above, when trying to increase the output or make the lamp more compact, the wall of the outer bulb 1 Since a discharge path is formed along the outer tube 1, it is difficult to control the tube wall portion of the outer tube 1 as the coldest portion to around 40° C., which is the optimum temperature.

On the other hand, when trying to create the coldest part on or near the substrate 8 of the electrodes 2 and 3, it was difficult to sufficiently regulate the coldest part because this part is close to the high-temperature discharge space. In other words, it was sometimes difficult to lower the temperature of the coldest part to a predetermined temperature.

(Object of the Invention) The present invention was made based on the above-mentioned circumstances, and its object is to obtain a multi-pole low-pressure mercury vapor discharge lamp that can sufficiently regulate the coldest part.

[Summary of the invention]

The multi-pole low-pressure mercury vapor discharge lamp of the present invention includes an outer tube in which mercury and a rare gas are sealed and which is open at one end and closed at the other end, and a mount substrate that closes the opening of the outer tube. , one electrode provided inside the outer tube and approximately at the center of the mount substrate, and a plurality of electrodes provided inside the mount substrate so as to be located inside the outer tube and around the electrodes. The present invention is applied to a device that includes the other electrode and a partition that partitions between these two electrodes so that the discharge is detoured.

In the present invention, a cylindrical stem attachment part is formed at the position where each electrode of the mount board is provided, and the stem is connected to the inside of the outer tube and projects to the outside of the mount board,
These stem attachments are characterized in that the stems each having an electrode implanted therein are sealed at the open ends of the parts.

According to the multi-pole low-pressure mercury vapor discharge lamp having the above configuration, the cylindrical stem that protrudes to the outside of the mount substrate is attached every time the stem is sealed in the part. It can be the coldest part. This space, which is the coldest part, is away from the wall of the outer tube that is exposed to the discharge space, so it is easy to lower the temperature to the desired temperature.
The rapid cooling section can be sufficiently regulated.

(Embodiment of the Invention) The outer tube 10 in the embodiment shown in FIG. 1 is formed of a translucent material such as glass into a substantially cylindrical shape with one end (lower end in the figure) open. There is.

The opening of the outer tube 10 is sealed by joining a glass mount substrate 11 having a substantially disk shape, and the distal end side of the outer tube 10 has a hemispherical shape. The inside of the outer tube 10 is filled with mercury and a rare gas for starting, and forms a discharge space 12 separated from the outside. Further, a phosphor (the path shown in the figure) is coated on the inner surface of the outer tube 10. Note that when used as an ultraviolet light source, no phosphor is required.

Inside the outer tube 10, a cylindrical partition body 15 also made of a transparent material such as glass is arranged concentrically. The base of the partition 15 is joined to the mount substrate 11, and the front end of the partition 15 is open. Therefore, the partition 15 forms a detoured discharge path in the discharge space 12, that is, a meanderingly curved discharge path.

Moreover, one preheating cathode 20 located approximately in the center of the outer tube 10 is provided inside the partition body 15 . This cathode 20 is supported by a stem glass 23 by a pair of support parts 22 which also serve as conductive wires. and stem glass 2
The stem 25 is supported by the mount substrate 11 by sealing an outwardly expanding flare portion 24 formed at the end of the stem 3 with an open end of the stem attachment portion 27 . This stem 25 may be similar to the stem of a conventional fluorescent lamp.

The stem mounting portion 27 is made of the same glass material as the mount substrate 11 and has a cylindrical shape. The stem attachment portion 27 is glass-bonded so as to protrude toward the outer surface of the mount substrate 11 at the edge of a hole 28 formed in the mount substrate 11. Therefore, the stem attachment portion 27 communicates with the interior of the outer tube 10.

Further, on the base end side between the outer tube 10 and the partition body 15, a plurality of anodes 30 (for example, seven) are arranged at equal intervals in the circumferential direction. Each anode 30 is connected to an external high-frequency switching circuit via a support portion 32 that also serves as a conductive wire, so that each anode 30 is sequentially switched. The high frequency switching circuit may be similar to that of a conventional multi-channel arc system (see FIG. 6).

The anode 30 is supported by a stem glass 33 by its support portion 32 . The outwardly expanding flare part 34 formed at the end of the stem glass 33 is integrally sealed with the open end of the stem attachment part 37.
A stem 35 is supported by the mount substrate 11.

The above-mentioned stem mounting section 37 is the above-mentioned stem mounting section 27.
It is also made of glass and has a cylindrical shape. The stem mounting portion 37 is attached to the mount board 11.
It is joined so as to protrude toward the outer surface of the mount substrate 11 at the edge of the hole 38 formed in the mount substrate 11 .

In manufacturing the discharge lamp of the above embodiment, as shown in the second factor, the stem mounting portions 27.37 are bonded to the mount substrate 11 in advance, and each stem 25.3
I will also make 5. And each stem installation is part 27.3
After inserting the stem 25.35 into the flare part 24.
34 is attached to the stem by heating and welding the opening edge of portion 27.37 with a burner to seal it. This sealing method is almost the same as that for conventional fluorescent lamps, and can be mass-produced using existing technology and equipment.

In one embodiment of the above configuration, a discharge path is formed between the cathode 20 and the anode 30 by applying a voltage between the cathode 20 and the anode 30 and sequentially switching each anode 30 using a high frequency switching circuit. are formed sequentially. Therefore, apparently many arcs are formed, and the outer tube 10
Visible light can be emitted by the luminescence of the phosphor attached to the partition body 15.

Thus, according to this embodiment, the cylindrical stem protruding toward the outer surface of the mount substrate 11 is attached to the portion 27°37, and the electrode 2
Since the implanted stem 25°35 of 0.30 mm is connected, during lighting, the stem is attached to the space inside the part 27.37, that is, the coldest part near the sealed end of the flare part 24.34. arise. Since this coldest part is located away from the tube wall of the outer tube 10 exposed to the discharge space, it is easy to lower the temperature to a desired temperature, and the coldest part can be sufficiently regulated. Furthermore, by increasing the length of the portions 27 and 37 when attaching the stem, the effective light emitting length connecting the cathode 20 and the anode 30 can be increased.

Moreover, since the flare part 24.34 of the stem is sealed in the small diameter cylindrical stem attachment part 27.37, the shape of the stems 25, 35 is the same or similar to the stem of an existing fluorescent lamp, etc. No special stem structure is required.

Furthermore, distortion during sealing does not pose a practical problem. Therefore, it is easy to manufacture and suitable for mass production.

Other embodiments of the present invention are shown in FIGS. 3 and 4. This embodiment will be described below, but parts common to the previous embodiments will be given the same reference numerals and detailed explanation will be omitted.

In this embodiment, between the cathode 2o and the anode 3o, 2
Two partition bodies 15 and 15' are arranged, forming a triple pipe structure. That is, the first partition body 15 has a cylindrical shape whose base side is joined to the mount substrate 11 and whose other end side is open, as in the embodiment described above. The second partition 15' is arranged concentrically inside the partition 15 and surrounds the cathode 20. This partition body 15'
It is also made of a transparent material such as glass and has a tubular shape with a closed tip. Also, the second partition body 15'
An opening 4o is provided on the mount substrate 11 side.

Therefore, a meandering discharge path is formed in the discharge space 12 by the two partitions 15° and 15'. Furthermore, a fluorescent substance (not shown) is coated on the inner surface of each partition body 15, 15'.

Further, the cathode 20 is supported by a stem glass 23 via a long support part 22 which also serves as a conductive wire so as to be located near the top of the second partition 15'. Each support portion 22 is inserted into an insulating tube 42 .

Also in this embodiment, the cylindrical stem mounting portions 27.37 are provided on the mount substrate 11, and the flare portions 24.34 of each stem 25.35 are attached to the stem mounting portions 27.37.
It is sealed at 7.37.

Therefore, as in the case of the previous embodiment, the coldest part can be sufficiently regulated, and a stem structure not significantly different from that of a conventional discharge lamp can be used. Incidentally, the second partition body 15' and the stem attachment portion 27 may be integrated.

(Effects of the Invention) According to the present invention, the optimum coldest part can be easily obtained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a discharge lamp showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the discharge lamp shown in Fig. FIG. 4 is a longitudinal cross-sectional view showing another embodiment of the invention, and FIG. 4 is a cross-sectional view of the discharge lamp shown in FIG. 3. FIG. 5 is a longitudinal sectional view showing a conventional example, and FIG. 6 is a circuit diagram of the discharge lamp shown in FIG. 10...Outer tube, 11...Mount board, 15.15
'... Partition body, 20... Cathode (electrode), 24...
・Flare part, 25... Stem, 27... Stem mounting part, 30... Anode (electrode), 34... Flare part,
35... Stem, 37... Stem installation part. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] an outer tube in which mercury and a rare gas are sealed and one end is open and the other end is closed; a mount board that closes the opening of the outer tube; and an abbreviation for mount board that is inside the outer tube. one electrode provided in the center; a plurality of other electrodes provided on the mount substrate so as to be located inside the outer tube and around the electrode; In the multi-pole low-pressure mercury vapor discharge lamp, a tube is provided at a position of the mount substrate at which each of the electrodes is provided, the tube communicating with the inside of the outer bulb and protruding toward the outer surface of the mount substrate. 1. A multi-pole low-pressure mercury vapor discharge lamp characterized in that a stem mounting portion is formed in the shape of a shape, and a stem having an electrode implanted therein is sealed at the open end of the stem mounting portion.