JPS5887751A - Electric-discharge lamp - Google Patents

Abstract

PURPOSE:To obtain an electric-discharge lamp, which has a simple constitution and a low cost and in which cross talk can be practically neglected, by locating an inner encircling member non-coaxially with an outer encircling member. CONSTITUTION:An inner and an outer encircling members 2 and 1 are non- coaxially superposed on one another so that the space distance (g1) between the inner wall of the outer case 1 and the partition wall part of the inner member 2 which separates adjacent electrodes 5 and 6 is below about 0.5mm.. After that, the members 2 and 1 are fused together. As a result, any cross talk can be almost completely prevented. Here, there is a lamp in which the space distance (g2) between the inner wall of the outer member 1 and the partition wall part of the inner member 2 becomes as large as up to around 1.8mm.. However, even in such a lamp, no cross talk has developed in space area corresponding to the space distance (g2).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp. Incandescent light bulbs emit a warm and pleasant light color, are easy to use, and are compact, high-intensity lamps that are suitable for accent lighting, and are therefore preferred for use in homes, stores, and the like. However, in the new era of energy saving, their low efficiency has become a problem, and recently there has been a demand for the development of highly efficient compact discharge lamps to replace incandescent light bulbs.

Under such circumstances, the applicant has already filed a patent application in 1986-
No. 30669 (Japanese Unexamined Patent Publication No. 52-113584), etc., proposed a compact discharge lamp as an alternative to an incandescent light bulb.

In this discharge lamp, an inner envelope made of the same material is inserted inside an outer envelope made of a translucent glass material, which has a spherical or cylindrical curved surface. The two are overlapped and hermetically sealed to each other at the openings of both to form a sealed portion. In addition, the inside of the container has a groove that forms a discharge path, which is made in a meandering shape to form one continuous discharge path, and two electrodes are held at both ends by supporting conductors. and is further connected to external conductors. The inner surface of the outer envelope body and the outer surface of the inner envelope body are coated with a phosphor. Excess mercury and a rare gas are sealed in a luminescent envelope consisting of an outer envelope and an inner envelope.

The inventors are working to put the above-mentioned discharge lamp into practical use.

In the process, the discharge arc does not pass through the regular groove,
It has been found that there is a problem in that so-called crosstalk occurs through the gap region between the grooves. In other words, at the lamp manufacturing stage, the dimensional difference between the inner diameter of the envelope outer body and the outer diameter of the envelope inner body must be reduced to the extent that crosstalk does not practically occur for all lamps (approximately 0.
7 or less) is extremely difficult to manufacture glass containers.
It became clear that crosstalk occurred at a relatively high rate in the prototype lamp.

An object of the present invention is to provide a discharge lamp that prevents crosstalk.

The inventors analyzed the occurrence of the above-mentioned crosstalk, and found that crosstalk occurs with almost 100% probability.
As shown by diagonal lines in Fig. 1 (Fa), it was confirmed that - occurs through the gap region between the grooves where both electrodes are located.

This crosstalk is caused by increasing the distance between the container outer body and the container inner body so that the gap length between the inner surface of the container outer body and the outer surface of the container inner body is small, especially in the gap region near both electrodes. It has become clear that this can be almost completely prevented by sealing the inner body off to one side.

The details of the experimental studies that led to the completion of the present invention will be explained below with reference to the drawings.

Figure 1 shows the structure of the discharge lamp used in the experiment.

The outer diameter φ1o of the container outer body 1 is 65 mm, and the length L is approximately 100 mm.
It is mm. Inside this container outer body is a container inner body 2.
are placed one on top of the other, and are hermetically sealed at the opening 3 of both. A groove 4 forming a discharge path is formed in the container inner body 2, and a width V of a partition wall portion 2a separating the grooves 4 is approximately 1. Electrodes 5 and 6 are provided at both ends of the discharge path 4.
are placed adjacent to each other, and the distance between the electrodes is approximately 270 m.
It is m. Entire inner surface of container outer body 1 and container inner body 2
A phosphor 7 made of a calcium halophosphate phosphor or a narrow band emitting three-wavelength emitting phosphor is coated only on the groove portion of the outer surface of the phosphor. Excess mercury and argon 2.
5 Torr is enclosed.

In FIG. 1(a), 8 is a support conductor, 9 is an external conductor, and 10 is an exhaust pipe.

Now, when the container outer body 1 and the container inner body 2 with the above specifications were prototype molded using an automatic manufacturing machine, the dimensions of the inner diameter φ11 of the container outer body 1 and the outer diameter φ2C of the container inner body 2 were found. Difference Δ(φ4,
-φ20) was found to be impossible in terms of manufacturing within a small range where crosstalk can be practically prevented. In other words, as a result of the inventors' study, the dimensional difference Δ(φ1
1-φ20) was required to be approximately 0.7m or less,
In actual manufacturing, Δ(φ11-φ20) is at most 2.0+mn
It has become clear that this will become the case.

The inventors have determined that the above dimensional difference Δ(φ11-φ20)'
;c Using O container outer body 1 and container inner body 2,
When we investigated ways to prevent crosstalk, we found the following.

(1) As shown in FIG. 1(b), the gap length between the partition wall 2a of the container inner body 2 and the inner surface of the container outer body 1, which separates the adjacent electrodes 6゜6 from each other. Talostalk can be almost completely prevented if the container inner body 2 is offset to the container outer body 1 and then sealed together so that g1 is as small as about 0.5 or less. be able to. in this case,
In some lamps, the gap length g2 between the partition wall part 2b facing the partition wall part 28 and the inner surface of the container outer body is as large as about 1.8 gourds, but even in such lamps, the gap area corresponding to the gap length g2 is No crosstalk occurred. −
Therefore, in lamp manufacturing, by simply adjusting the gap length g1 to be smaller in the step of inserting the container inner body 2 inside the container outer body 1, the cross-stack can be reduced.
It was found that the occurrence of swelling can be significantly suppressed.

(2) Next, as shown in FIG. 2(a) or (b), the container outer body 1 or the container inner body 2 is molded to have an asymmetrical shape with respect to its center line. Accordingly, the gap length g1 can be effectively reduced. In other words, in FIG. 2(a), the inner body 2 of the container is made asymmetry with respect to the center line so that the radius R1 on the side where crosstalk occurs is approximately 0.7 times larger than the radius R2 on the other side. If the container outer body 1 is molded with By slightly shifting the inner body 2, this gap length g
1 within a range in which crosstalk of 0.5 mm or less does not occur. On the other hand, in FIG. 2(b), the radius R+' on one side of the container outer body 1 is made shorter by about 0.7 m+n than the radius R2' on the other side, so that it is molded asymmetrically with respect to the center line. In this case, when stacking such container outer bodies, it is necessary to stack them together with directionality, but this is an easy operation.

As explained above, the present invention includes a container outer body whose outer shape is partly or entirely spherical or cylindrical and has one opening, and an inner side of the container outer body. A light-emitting envelope is formed by the container inner body, and a groove forming a discharge path is formed in at least one of the container outer body and the container inner body. and a ridged portion 5) exposed in at least one of the grooves on the outer surface of the inner body of the container.
In a discharge lamp in which a phosphor is coated with a phosphor, a pair of electrodes are provided at both ends of the groove, and mercury and a rare gas are sealed in the luminous envelope, the electrodes are adjacent to each other. The gap length between the partition wall of the container inner body that isolates the electrodes from each other and the inner surface of the container outer body is such that the gap length between the partition wall portion facing the partition wall portion and the inner surface of the container outer body is By arranging the inner body of the container offset with respect to the outer body of the container so that the gap is smaller than the gap length, the structure is simple and inexpensive, and crosstalk is practically ignored. Therefore, it is possible to provide a discharge lamp that can prevent this to a certain degree.

[Brief explanation of the drawing]

FIG. 1 (2L) is a cross-sectional view of the discharge lamp according to the present invention,
Figure 2(b) is a sectional view taken along the line X-X in Figure 2(a), and Figures 2(1) and 2(b) are sectional views of main parts of another discharge lamp according to the present invention. be. 13.109. Container outer body, 2... Container inner body, 21a. 2 b ---Partition wall, 3°...opening, 4...
...Groove, 5゜6... Electrode.

Claims (1)

[Claims] A light-emitting enclosure is formed by a container outer body whose outer shape is partially or entirely spherical or cylindrical and has one opening, and a container inner body superimposed on the inside of the container outer body. A groove is formed in at least one of the container outer body and the container inner body, and a groove forming a discharge path is formed in at least one of the inner surface of the container outer body and the outer surface of the container inner body. A discharge is provided in which a phosphor is coated on the exposed portion of one of the grooves, a pair of electrodes are provided at both ends of the groove, and mercury and rare gas are sealed in the luminous envelope. In the lamp, the gap length between the partition wall of the container inner body and the inner surface of the container outer body, which separates adjacent electrodes from each other, is such that the gap length between the partition wall portion and the container facing the partition wall portion is equal to A discharge lamp characterized in that the inner body of the container is disposed offset from the outer body of the container so that the gap length between the inner surface and the inner surface of the outer body is smaller than the length of the gap between the inner surface and the inner surface of the outer body.