JP2001229823A - Low pressure mercury-vapor discharge lamp and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a more compact low pressure mercury-vapor discharge lamp. SOLUTION: This low pressure mercury-vapor discharge lamp 1 is partitioned by partition 3 inside a glass tube 2 and provided with a U-shaped discharge space inside it. Electrodes 5, 6 are provided on both sides of the discharge space and a folding part 4 is provided at the center of the discharge space. A phosphor film 7 is coated on the internal surface of the glass tube 2 and on the surface of the partition 3. A simplicial rare gas or compound rare gas is sealed in the tube of the low pressure mercury-vapor discharge lamp 1 in an airtight condition isolated from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pressure mercury vapor discharge lamp.

[0002]

2. Description of the Related Art Conventionally, as a method for realizing a high-load fluorescent lamp as a low-pressure mercury vapor discharge lamp, a bridge joining process in which a plurality of tube glasses are connected (Japanese Patent Publication No. 1-5185).
No. 2), a bending process in which a tube glass is heated and bent (Japanese Patent Application Laid-Open No. 57-174846), and a molding process in which the tube glass is heated and re-formed by a mold (Japanese Patent Application Laid-Open No. 61-148759). Etc. are known.

[0003]

SUMMARY OF THE INVENTION Low-pressure mercury vapor discharge lamps such as fluorescent lamps are required to be further compact and have higher output. Heretofore, this demand has been met solely or in combination of the three processing methods mentioned in the prior art, but each has advantages and disadvantages.

[0004] The bridge joining process has good workability, but has disadvantages such as low strength, formation of a non-light emitting portion, and poor startability. The bending process has a drawback that the curvature of the bent portion is limited, and the arc tube is crushed and closed halfway, so that further compactness cannot be expected. Mold processing is
It is necessary to sufficiently heat the tube glass to a temperature at which the tube glass can be reformed, which takes time and also has a disadvantage that productivity is not good. Further, in any of the processing methods, a plurality of tube glasses or a tube glass having a length of twice or more the length of the arc tube is required, or a portion between adjacent tube glasses that does not function as an effective light emitting surface because of mutual interruption. For example, it has undesirable disadvantages from the viewpoint of resource saving and energy saving.

An object of the present invention is to solve the above-mentioned problems and to obtain a more compact low-pressure mercury vapor discharge lamp.

[0006]

According to the low pressure mercury vapor discharge lamp of the present invention, one discharge space is formed inside the tube glass, and the discharge space is formed by partitioning the inside of the tube glass. It has a configuration.

As a result, a compact low-pressure mercury vapor discharge lamp can be obtained.

A method for manufacturing a low-pressure mercury vapor discharge lamp according to the present invention is a method for manufacturing a low-pressure mercury vapor discharge lamp according to claim 1, wherein one tube glass is heated and softened, and then said tube glass is softened. A part of the inner surfaces is fused together to partition the inside of the one tube glass into a plurality of spaces, and an end of the tube glass is closed, and the plurality of spaces are connected to each other so that the inside of the tube glass has a diameter of 1 mm. A folded portion for forming one discharge space is formed.

Thus, a compact low-pressure mercury vapor discharge lamp can be obtained.

The method for manufacturing a low-pressure mercury vapor discharge lamp according to the present invention is the method for manufacturing a low-pressure mercury vapor discharge lamp according to claim 1, wherein a partition is inserted into one tube glass, and the tube glass is removed. After heating and softening, the partition body and the inner surface of the tube glass are fused to partition the inside of the one tube glass into a plurality of spaces, and the end of the tube glass is closed, Connect a plurality of spaces and place one inside the tube glass
A folded portion for forming one discharge space is formed.

Thus, a compact low-pressure mercury vapor discharge lamp can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A low-pressure mercury vapor discharge lamp according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 3, a low-pressure mercury vapor discharge lamp 1 (hereinafter, referred to as a fluorescent lamp) is partitioned by a partition body 3 inside a tube glass 2 and has a single U-shaped discharge space therein. Are formed. Electrodes 5 and 6 are provided at both ends of the discharge space, and a folded portion 4 is provided at the center of the discharge space. The discharge passes through, for example, the electrode 5-the folded portion 4-the electrode 6.

On the inner surface of the tube glass 2 and the surface of the partition 3,
A phosphor film 7 is formed, and a simple substance or a mixture of a rare gas is sealed in the tube of the fluorescent lamp 1 in an airtight state with the outside. Capillary glasses 8, 9 are installed near electrodes 5, 6 provided at both ends of the discharge space of the fluorescent lamp 1, and the mercury holder 1 is placed in one of the capillary glasses 9.
0 and the support 11 are enclosed. When the mercury holder 10 is mercury itself, the support 11 is unnecessary, and in that case, it may be located at any position within the tube of the fluorescent lamp 1. The cross section of the fluorescent lamp 1 in the tube axis direction is shown in FIG.
As shown in (a), (b) and (c), the tube glass 2
It may have various shapes depending on the processing of.

Next, a method for manufacturing a low-pressure mercury discharge lamp according to an embodiment of the present invention will be described.

As shown in FIG. 4A, a partition 3 is formed inside a straight tube glass 2 having openings at both ends.
After installing the glass partition plate, as shown in FIG. 4 (b), after sufficiently heating the outer surface of the tube glass 2 until it is softened, the inside of the tube is depressurized and depressed, or a mold is pressed. By making it concave, the inner wall of the tube glass 2 is fused to the entire length side surface of the partition body 3 without any gap. At this time, the length of the partition body 3 is shorter than the length of the tube glass 2 in order to provide the folded portion 4 and the electrodes 5 and 6 in a later step. Next, as shown in FIG. 4 (c), one end of the tube glass 2 is closed with a little gap from the tip of the partition body 3. As a method of closing, any of a mold, a pinch seal, and a top seal may be used. At the time of this blockage, the gap left slightly becomes the turn-back portion 4 of the discharge. In the present embodiment, as the tube glass to be partitioned,
Although the tube glass 2 having an opening at both ends is used, a tube glass having an opening at one end and a closed portion at the other end may be used. In this case, the closed portion side becomes the folded portion 4, The tube glass 2 is partitioned so as to leave the space to be the turning portion 4.

The formation of the phosphor film 7 is carried out before or after closing, depending on the method of closing. Subsequently, the electrodes 5, 6 and the capillary tubes 8, 9 are sealed to the tube ends of the tube glass 2 on the side opposite to the folded portion 4 by a pinch seal. Then, the gas is evacuated in the same manner as a normal discharge lamp, a rare gas simple substance or a mixture is introduced into the tubes through the thin glass tubes 8 and 9, and at the same time, the mercury holding member 10 and the support member 11 are charged. The glass tubes 8, 9 are cut off so that the inside of the tube of the vapor discharge lamp 1 is kept airtight from the outside (FIG. 4).
(D)).

FIGS. 5A and 5B show the fluorescent lamp 1.
2 shows a side cross-sectional view of the vicinity of the folded portion 4. If the length of the partition 3 is shorter than the tube glass 2 as shown in FIG. 5A, the folded portion 4 can be easily formed. However, as shown in FIG. This can be left empty and used for the turnback unit 4.

FIG. 6 shows a fluorescent lamp according to another embodiment of the present invention. In the above embodiment, the partition 3 is
While a flat plate was used, in the present embodiment, a spiral plate was used as the partition 3 as shown in FIG. This makes the discharge space spiral and extends the discharge distance. The longer the length of the discharge space, the higher the output,
High efficiency can be realized.

FIG. 7 shows a fluorescent lamp according to another embodiment of the present invention. In the present embodiment, as shown in FIG.
A plurality of, for example, three tube glasses 2 having a folded portion 4 and a partition body 3 therein are air-tightly connected by a connecting means such as a bridge joint to form one light emitting tube. One discharge space is obtained between six. This makes it possible to realize a more compact and high-output fluorescent lamp 1.

In each of the above embodiments, the partition space 3 is provided to partition the discharge space. However, the interior of the tube glass is partitioned by partially fusing the inner surfaces of the tube glass without using the partition body 3. To form a discharge space.

[0022]

As described above, according to the present invention,
A compact low-pressure mercury vapor discharge lamp can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a low-pressure mercury vapor discharge lamp according to an embodiment of the present invention.

FIG. 2 is a view for explaining a cross section in the tube axis direction of the low-pressure mercury vapor discharge lamp shown in FIG.

FIG. 3 is a partially cutaway perspective view of the low-pressure mercury vapor discharge lamp shown in FIG.

FIG. 4 is a view for explaining a method of manufacturing the low-pressure mercury vapor discharge lamp of the present invention.

FIG. 5 is a side cross-sectional view of the folded portion.

FIG. 6 is a partially cutaway front view of a low-pressure mercury vapor discharge lamp according to another embodiment of the present invention.

FIG. 7 is a partially cutaway front view of a low-pressure mercury vapor discharge lamp according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-pressure mercury vapor discharge lamp 2 Tube glass 3 Partition body 4 Folding part 5,6 Electrode 7 Phosphor coating 8,9 Capillary glass 10 Mercury holder 11 Support 12 Connection part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shingo Matsuda 1-1, Sakaicho, Takatsuki-shi, Osaka Matsushita Electronics Co., Ltd. F-term (reference) 5C012 AA08 EE03 EE08

Claims (6)

[Claims] 1. A low-pressure mercury vapor discharge lamp according to claim 1, wherein one discharge space is formed inside the tube glass, and the discharge space is formed by partitioning the inside of the tube glass. 2. An electrode is provided at both ends of a discharge space formed inside one tube glass or a discharge space formed by connecting a plurality of said tube glasses. 2. The low-pressure mercury vapor discharge lamp according to 1. 3. The low-pressure mercury vapor discharge lamp according to claim 1, wherein the discharge space is formed by being partitioned by a partition body. 4. The method for manufacturing a low-pressure mercury vapor discharge lamp according to claim 1, wherein one tube glass is heated and softened, and then a part of the inner surfaces of the tube glass is fused to each other. While folding the inside of one tube glass into a plurality of spaces, closing an end of the tube glass, connecting the plurality of spaces, and forming a folded portion for forming one discharge space inside the tube glass. A method for manufacturing a low-pressure mercury vapor discharge lamp, comprising: 5. The method for manufacturing a low-pressure mercury vapor discharge lamp according to claim 1, wherein a partition is inserted into one tube glass, and the tube glass is heated and softened, and then the partition member is heated. And the inner surface of the tube glass is fused to partition the inside of the one tube glass into a plurality of spaces, and to close the end of the tube glass to connect the plurality of spaces to each other to connect the inside of the tube glass. A method for manufacturing a low-pressure mercury vapor discharge lamp, comprising forming a folded portion for forming one discharge space. 6. The tube glass to be partitioned is a tube glass having an opening at both ends or a tube glass having an opening at one end and a closing portion at the other end. The method for producing a low-pressure mercury vapor discharge lamp according to claim 4 or 5.