JPH08335452A - Single end type discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the mechanical strength of a tube foot part by forming a rib projecting toward the inside of a cap part and supporting a coupling material on a tube supporting part in the inside part. SOLUTION: A discharge tube 2 has tube foot parts 3a-3h, and they are adjacently arranged in serial order to form a closed continuous discharge space. A rib 10 projecting toward the inside of a cap part 4 is formed on a tube supporting part 5 in a cylindrical wall shape, and comes in contact with the tube supporting part 5. The tips of the tube foot parts 3a-3h of the discharge tube 2 within the cap part 4 are fixed to the tube supporting part 5 with a coupling material 9, and the coupling material 9 surrounds the discharge tube 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-ended discharge lamp having a discharge tube having at least two legs and a cap portion designed to be mechanically and electrically connected to a lamp holder. It is a thing. The cap portion of this type of discharge tube is composed of a tube supporting portion, a connecting portion and a contact forming portion, and these portions are connected to each other, and the tube supporting portion has holes for arranging the above-mentioned legs of the discharge tube. The tip of the discharge tube leg is formed and is fixed in the cap by a bonding material applied to the outside of the tube support surrounding the discharge tube.

[0002]

2. Description of the Related Art The above-mentioned single-end type discharge lamp,
That is to say, a fluorescent lamp basically intended for miniaturization is commercially available, and it is provided with four or six glass tube legs, and the tips of these legs serve as discharge tubes inside the cap portion. It is fixed to the pipe support by the surrounding thermosetting cement material. The cement material is generally separated from the outside by the outer rim of the tube support. After it has been applied to the required parts during processing with the cement material, it is hardened by continuing to heat at a given temperature for a given time. During this time, the cement material expands and hardens and is bonded to the glass tube leg by an adhesive. Due to this expansion, the glass tube leg is pressed towards or from the outer rim of the tube support. Based on this, the pipe leg is fixedly held on the pipe support. In these discharge lamps, there is a problem that the tube leg portion naturally cracks or breaks. From the experience, such natural destruction or cracking not only occurs in the manufacturing process, but also easily occurs when the storage, transportation or discharge lamp is subsequently exposed to a large mechanical load, and in fact, the reliability of the discharge lamp is high. It is something that damages.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solution for eliminating the drawbacks of discharge lamps such as those mentioned above, thereby improving the reliability of the discharge lamp. .

[0004]

SUMMARY OF THE INVENTION The present invention recognizes that the expansion and hardening of cement materials exerts mechanical forces on the glass that further increase the stresses exerted on the glass during the early stages of the manufacturing process. It is based. The stress generated in this method can be reduced by fixing the tip of the tube leg portion of the discharge tube to the tube supporting portion in the cap portion with a predetermined bonding material. This predetermined bonding material is applied not only to the outer part of the tube support that surrounds the discharge tube, but also to the inner part of the discharge tube, which is delimited by the tube legs.

In this configuration, the present invention provides at least two
The present invention relates to a single-ended discharge lamp including a tube leg portion of a book and a discharge tube having a cap portion designed to be mechanically and electrically connected to a lamp holder.
In this case, the cap portion is composed of the tube supporting portion, the connecting portion and the contact forming portion, and these portions are connected to each other, and the tube supporting portion is formed with holes for arranging the legs of the discharge tube. The ends of the legs of the discharge tube located inside the cap are fixed by the bonding material applied to the outside of the tube support. The outer portion of the tube supporting portion surrounds the discharge tube, and the tip ends of the legs of the discharge tube located inside the cap portion are supported by the bonding material applied to the inner portion of the discharge tube divided by the leg portions. Fixed to the section.

In a preferred embodiment of the solution according to the invention, an inner tube support in the middle of the plurality of hole arrangements formed in the tube support projects on the inner side of the cap and has a binding material. Supporting ribs are formed. Hereby, both the ribs and the outer rim of the tube support provide a suitable space or surface for receiving and supporting the binder, for example by providing a reasonable dimension, which allows the binder to expand and harden. The generated force can be absorbed.

In order to ensure a uniform internal stress exerted by the binder, it is desirable to use cylindrical wall-shaped ribs, especially in discharge lamps having a large number (at least 6) of tube legs.

By using the solution according to the invention, the glass tube legs are not exposed to asymmetric mechanical loads, so that they produce only small mechanical stresses. Furthermore, the solution according to the invention is advantageous with regard to the fixing strength of the tube support of the cap part and the legs of the discharge tube, such that a coupling force of this kind withstands relatively high mechanical loads. The advantages of the solution according to the invention are in particular 6
It is remarkably exhibited in a book or a discharge tube having eight or more tube legs.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the drawings.

The discharge lamp shown in FIGS. 1 and 2 is an OCT type compact fluorescent lamp having a discharge tube 2 and a cap portion 4. The discharge tube 2 is filled with an electrode (not shown), gas and metal vapor, and further, eight tube legs 3a, 3b, 3
c, 3d, 3e, 3f, 3g, 3h, and each of these tube legs has an outer diameter of 12 mm, and forms a continuous discharge space that is sequentially adjacent and closed. The cap portion 4 is composed of a tube supporting portion 5, a connecting portion 6 and a contact forming portion 7. A circular opening is formed on the tube supporting portion 5, and its central portion is located on the circumference divided by a diameter of 37 mm.
Pipe legs 3a, 3b, 3c, 3d, 3e, 3f, 3g,
It accepts 3h. Further, on the pipe supporting portion 5, the rib 1 protruding toward the inside of the cap portion 4 is formed.
0 is formed, which has the shape of a cylindrical wall, contacts in its material with the tube support 5 and has dimensions of 1 mm thickness, 6.5 mm height and 20 mm inner diameter. The tube support 5 and the connection 6 are made of a plastic material, for example polyethylene terephthalate, which are fixed to one another in a snap-engaged state or, if desired, with an adhesive. The contact formation part 7 is fixed on the connection part 6 and has, for example, a screw structure for insertion into a lamp holder. Operate the discharge tube 2,
An electronic circuit, part of which is connected to the electrode of the discharge tube 2 and the other part of which is connected to the contact part of the contact forming part 7, is arranged and formed in the connecting part 6.

The tips of the tube leg portions 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h of the discharge tube 2 in the cap portion 4 are connected to the tube support portion 5 by a connecting material 9 (shown by cross hatching in the figure). This joint material 9 is fixed at two positions, that is, surrounding the discharge tube 2 and separated from the outside by a cylindrical wall-shaped rim 8 having an outer diameter of 53.5 mm and a thickness of 2 mm, and a tube leg portion 3a. 3b, 3c, 3d, 3e, 3f,
It is applied to the inner part 12 which is segmented by 3g and 3h and which is located outside the rim 10.

The binder 9 is a thermosetting cement composed of a natural or artificial resin and a solvent existing before curing.
After its application, the cement is heated at a temperature of 100-180 ° C. for a few minutes to bake harden. Desirably, the cement is applied in the outer portion 11 and the inner portion 12 in an amount sufficient to cover the members described above and shown in the drawings. Approximately 1 to 3 mm between the closest pipe legs
The part of must be excluded. The bonding material 9 follows the shape of the tip of the pipe leg and is continuous so as to extend from both sides of the narrowed portion at the tip of the pipe leg. After baking, the bonding material 9 has a height of 7 at the inner side with respect to the surface of the tube supporting portion 5.
-8 mm, and height 8-9 mm at the outer part.

Between the tube support 5 and the discharge tube 2, the discharge lamp of the embodiment can withstand a twisting moment of 5 Nm and be intact, but in the case of OCT discharge lamps of the same size, a binder is used. Since 9 applies only to the outer part 11, this value is about 2.5 Nm.

[Brief description of drawings]

1 is a cross-sectional view showing an embodiment of a discharge lamp according to the present invention.

FIG. 2 is a front view showing an embodiment of a discharge lamp according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge lamp 2 Discharge tube 3 Tube leg section 4 Cap section 5 Tube support section 6 Connection section 7 Contact formation section 8 Rim 9 Binding material 10 Rib 11 Outer section 12 Inner section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ist van Brüssing, Hungary, 1051 Budapest, Eleu Seebet Tale 2 (72) Inventor Josef Flop, Hungary, 1146 Budapest, Tokor Oats 63

Claims (3)

[Claims] 1. A single-ended discharge lamp having a discharge tube with at least two tube legs and a cap designed to take mechanical and electrical connection to a lampholder, said discharge lamp comprising: The cap portion is composed of a tube supporting portion, a connecting portion and a contact forming portion, and the respective portions of the cap portion are connected to each other, and the tube supporting portion has a plurality of holes for arranging the legs of the discharge tube. In addition, the tip of the leg of the discharge tube located inside the cap portion is fixed by a bonding material applied to the outer side of the tube supporting portion surrounding the discharge tube, and the cap portion (4 ) Inside the discharge tube (2), the legs (3a, 3)
(3b, 3c, 3d, 3e, 3f, 3g, 3h), the tips of these pipe legs (3a, 3b, 3c, 3d, 3e, 3f, 3
g, 3h) and is fixed to the pipe supporting part (5) by a binding material (9) applied to the inner part (12) of the pipe supporting part (5). Single-ended discharge lamp. 2. A rib (10) is provided on the pipe support (5) and in the middle of an array of a plurality of holes formed on the pipe support (5), and the rib (10) is capped. A discharge lamp according to claim 1, characterized in that the binder (9) is supported by projecting it towards the inside of the part. 3. The discharge lamp according to claim 2, wherein the rib (10) is formed in a cylindrical wall shape.