JPS6335484Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact fluorescent lamp in which a bendable inner tube is housed in a discharge space formed by an outer tube and a button stem, and the inner tube serves as a discharge path.

1 and 2 show a conventional fluorescent lamp of this type, with FIG. 1 being an external perspective view and FIG. 2 being an exploded perspective view of the lamp portion. In the figure, reference numeral 1 denotes a U-shaped inner tube whose inner wall has been coated with a phosphor 2 and fired, and both open ends 3 of the inner tube 1 have respective annular projections formed on a disk-shaped metal holder 4. The metal holder 4 is fitted into the wall 5 and is held together by the support rod 7, the presser fitting 8, and the nut 9.
Fixed. Reference numeral 10 denotes a glass stem called a button stem, in which a lead wire 11 is enclosed, and a filament electrode 12 is attached to the tip of the lead wire 11. 13 is an exhaust pipe formed integrally with the stem 10. Reference numeral 14 denotes a spacer made of ceramic, which includes a small diameter portion 14a having an outer diameter that fits into the hole 6 in the annular projecting wall 5, and a metal holder 4.
Large diameter portion 14 having a stepped portion 14b that abuts the lower surface of
A hole 16 through which the electrode 12 can be inserted is provided in the center. After inserting the small diameter portion 14a of the spacer 14 into the hole 6 of the metal holder 4, the electrode 12 provided on the stem 10 is inserted into the hole 1 of the spacer 14.
6, and then insert the outer tube 17 and stem 10.
The lamp is sealed, and then the exhaust pipe 13 is used to exhaust air and fill gas in the same manner as a normal lamp. In FIG. 1, reference numeral 18 indicates a lighting device section containing a ballast, etc., and reference numeral 19 indicates a screw cap that can be screwed into a socket for a light bulb.

Such conventional fluorescent lamps have the following problems due to their construction, particularly regarding the button stem 10.

The button stem 10 and the outer tube 17 are made of glass that can be sealed to each other, for example, the button stem 10 is made of lead glass and the outer tube 17 is made of soda lime glass, and both are hermetically sealed by a burner. However, when the outer diameter of the button stem 10 is set to 50 to 60 mm, the distance between the button stem 10 and the outer tube 17 becomes longer, and thermal distortion becomes more noticeable. Moreover, since the button stem 10 is made of glass, its outer diameter and wall thickness vary, resulting in differences in the sealing state, and the above-mentioned distortion distribution and magnitude vary from lamp to lamp. Normally, in order to remove this distortion, all the lamps that have been sealed are immediately subjected to an annealing (distortion removal) operation, but as mentioned earlier, the state of distortion differs depending on the lamp, so after the annealing operation is completed, the button stem 10 is
There were many samples with cracks. In other words, since the button stem 10 is made of glass, there are problems in that the dimensional accuracy of the material is poor, the sealing state is not constant, and it is extremely susceptible to thermal distortion, which has been an obstacle in mass production.

The present invention was developed in view of these drawbacks, and its purpose is to house a bendable inner tube in the discharge space formed by the outer tube and the button stem, and to create a compact size using the inner tube as a discharge path. In this fluorescent lamp, the button stem is formed of ceramics, and the button stem and the outer tube are sealed with a low melting point glass adhesive, thereby producing a fluorescent lamp that has good sealing and is resistant to thermal distortion. There are lamps available.

Hereinafter, the present invention will be explained based on the illustrated embodiments. FIG. 3 is a perspective view showing one embodiment of the button stem used in the fluorescent lamp of the present invention, and 10c in the figure.
is a button stem molded from ceramics, on one side of which there are two spacers 14' each having a hole 22;
14' are simultaneously molded, and each hole 22
A glass cylinder 24 in which the lead wire 11 is enclosed is inserted and sealed with a low melting point glass adhesive 20 as shown in FIG. The exhaust pipe 13 is attached and sealed with the outer pipe 17 using a low melting point glass adhesive 20, as shown in FIG. Outer tube 17
A groove 21 is formed around the button stem 10c so that the button stem 10c can be accurately positioned. Incidentally, the lead wire 11 may be integrally enclosed in the ceramic constituting the spacer 14' without intervening the glass cylinder 24.

FIG. 4 shows a completed diagram of a lamp using such a button stem 10c. Note that Figure 4 is a cross-sectional view developed along the discharge path (indicated by the arrow in the figure), and parts equivalent to the conventional example are given the same reference numbers as in Figure 1 for explanation. omitted.

For example, the material used in this example is forsterite (2MgO・SiO ₂ ) for the button stem 10c;
The glass cylinder 24 is made of lead glass, the exhaust pipe 13 and the outer tube 17 are made of soda lime glass, and the low melting point glass adhesive 20 is made of LS-6414 frit (manufactured by Nippon Electric Glass Co., Ltd.)
It is.

As mentioned above, this invention improves dimensional accuracy and strength by forming the button stem with ceramics, and also improves yield by using a low melting point glass adhesive to seal the outer tube. This makes mass production possible. Furthermore, by molding the spacer and the button stem at the same time, the number of parts can be reduced and rationalization can be achieved.

[Brief explanation of the drawing]

1 and 2 show a conventional example; FIG. 1 is an external perspective view of a fluorescent lamp, FIG. 2 is an exploded perspective view of the same lamp part, and FIG. 3 is an example of a button stem according to the present invention. FIG. 4 is a perspective view showing the embodiment, and is a sectional view developed along the discharge path of a fluorescent lamp constructed using the button stem described above. DESCRIPTION OF SYMBOLS 1... Inner tube, 3... Open end, 4... Metal holder, 6... Hole, 7, 8, 9... Fixing means, 12...
...Electrode, 14'...Spacer portion, 10c...Stem, 17...Outer tube, 20...Low melting point glass adhesive.

Claims (1)

[Scope of utility model registration request] The opening ends of the two U-shaped inner tubes are brought into contact with the peripheries of four holes drilled in the metal holder, and the holder and the inner tube are fixed by means of a fixing means, thereby forming a spacer portion in which an electrode is enclosed. Aligning the spacer portion of the ceramic stem with the two adjacent holes of the holder and inserting the electrode into the inner tube,
A fluorescent lamp characterized in that a peripheral edge of the stem and an open end of an outer tube covering the inner tube are sealed with a low melting point glass adhesive.