JPH043389Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluorescent lamp containing an amalgam in the exhaust pipe.

[Prior Art] Conventional fluorescent lamps are known that are filled with amalgam for the purpose of keeping the mercury vapor pressure at a desired value during lighting. Furthermore, in order to improve the start-up during startup, it is known that an auxiliary amalgam for startup is provided near the filament, and a low-temperature amalgam is provided at a position somewhat distant from the filament. In this case, in order to improve the start-up upon restart, it is necessary that mercury be preferentially absorbed into the auxiliary amalgam when the lamp is turned off.
Therefore, it is known that a low-temperature amalgam is housed in an exhaust pipe led out from a flare stem to reduce the conductance, thereby making it difficult for mercury to be adsorbed by the low-temperature amalgam when the light is turned off.

When low-temperature amalgam is housed in the exhaust pipe in this way, the amalgam 2 in the exhaust pipe 1 may fall into the valve 3 from the opening 1a, as shown in FIG. It is known to provide a stopper member 4 between the amalgam 2 and the opening 1a.

[Problem to be solved by the invention] However, simply placing the stopper member 4 in the exhaust pipe 1 allows the stopper member 4 to move freely within the exhaust pipe 1, so when the valve 3 is moved, the stopper member 4 does not move. There is a problem in that the engine collides with the exhaust pipe sealing cut portion where sealing distortion remains, applying an impact to the exhaust pipe sealing cut portion, and causing a crack.

The present invention was developed based on the above circumstances, and its purpose is to prevent amalgam from falling from the exhaust pipe with a simple configuration.
The present invention aims to provide a fluorescent lamp with improved reliability.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fluorescent lamp in which an amalgam is housed in an exhaust pipe at the end of the bulb, which is located between the amalgam and the opening in the exhaust pipe. The present invention is characterized in that a stopper member is provided, and the pinch portion of the flare stem is also sealed and fixed to the base of the stopper member.

[Operation] According to the above structure, the stopper member does not move within the exhaust pipe, and therefore, there is no impact that may cause cracks. Furthermore, when the tip of the flare stem is pinch-processed during production of the flare stem, the stopper member can be integrally sealed and fixed to the pinch portion, and the structure can be configured without complicating the exhaust process. can.

[Embodiment of the invention] A first embodiment of the invention will be described below with reference to FIGS. 2 and 3. In the figure, 10 is a glass bulb of a fluorescent lamp, and this bulb 10
Flare stems 11 (only one of which is shown) are hermetically sealed to both ends of each. The flared stem 11 includes a flared portion 11a welded to the end of the valve 10, a pinched portion 11b formed at the tip of the flared portion 11a, and a pinched portion 11b.
It consists of an exhaust pipe 12 led out from the valve to the outside of the valve. An opening 12a communicating with the exhaust pipe 12 is formed on the side surface of the pinch portion 11b, and the exhaust pipe 12 communicates with the inside of the valve 10 through this opening 12a. The outer end of this exhaust pipe 12 has a seal 12
b. This sealing portion 12b projects outward from the axial end surface 10a of the bulb.

Internal conducting wires 15, 15 are sealed to the pinch portion 11b, and a filament 16 is wrapped around the inner ends of these internal conducting wires 15, 15. Furthermore, external conductors 17, 17 are connected to the outer ends of these internal conductors 15, 15.

An amalgam 20 is housed within the exhaust pipe 12. This amalgam 20 is Bi-In-Hg
It is made of an alloy and has a granular shape.

Further, a stopper member 21 is provided in the exhaust pipe 12 between the amalgam 20 and the exhaust pipe opening 12a. This stopper member 21 is made of a thin metal plate, and the end portion 21 on the amalgam side
a is bent as shown in FIG. Further, the end portion 21a is set at a position a distance L inside than the end portion 10a of the bulb.

The stopper member 21 is sealed integrally with the pinch portion 11b when the flare stem 11 is manufactured. That is, when manufacturing the flared stem 11, the flared portion 11 whose tip is not yet pinched
The exhaust pipe 12 is inserted into the tube a, the flared part 11a is heated and softened, and then the tip of the flared part 11a is pinched to seal the exhaust pipe 12 and the internal conductive wires 15, 15. By dropping the stopper member 21 into the exhaust pipe 12 from the outer opening of the exhaust pipe 12 at an appropriate time before pinching the tip, the base of the stopper member 21 is integrally sealed to the pinch part 11b. This allows the stopper member 21 to be fixed within the exhaust pipe 12.

Note that the flare stem 11 configured as described above
is sealed to the open end of the valve 10 in a known manner, and is connected to the exhaust pipe 12 from the outer opening of the exhaust pipe 12.
Insert amalgam 20 inside.

Thereafter, the inside of the valve 10 is exhausted through the exhaust pipe 12, and an inert gas is supplied into the valve 10 through the exhaust pipe 12. Then, the outer end of the exhaust pipe 12 is sealed off 12b.

Further, if necessary, a mercury getter 22 such as an auxiliary amalgam for starting may be provided near the filament 16. When using amalgam as the mercury getter 22, it is preferable to use, for example, a plate made of molybdenum plated with indium.

When the fluorescent lamp having the above structure is started, the mercury getter 2 is heated by the heat of the filament 16.
Since mercury is quickly released from 2, the start-up is good at startup. Also, when the lights are off, the Mercury Getter 2
2 absorbs mercury, and the low-temperature amalgam 20 also absorbs mercury. In this case, mercury passes through the exhaust pipe 12, but since the exhaust pipe 12 is provided with the stopper member 21, the conductance is small and adsorption to the amalgam 20 can be delayed. Therefore, mercury getter 2 for starting
2 can sufficiently adsorb mercury.

According to the above configuration, the amalgam 20 can be prevented from falling into the valve 10 by hitting the tip of the stopper member 21.

In this case, since the end portion 21a of the stopper member is bent, the amalgam 20 can be held effectively.

Also, the end portion 21a of the stopper member is connected to the valve 10.
By locating the amalgam 20 inward by the dimension L from the end surface 10a, the amalgam 20 can be sufficiently separated from the exhaust pipe sealing portion 12b.
It is possible to prevent the exhaust pipe 12 from melting and flowing out into the valve 10, and the length of the exhaust pipe 12 can be made equal to that of the conventional one, so that the protrusion does not become an obstacle.

Since the stopper member 21 is fixed to the stem 11, it is prevented from moving unnecessarily within the exhaust pipe 12, and the occurrence of cracks can be prevented.

Note that FIG. 4 shows a second embodiment of the present invention.

In this case, a glass rod is used as the stopper member 21. The stopper member 21 made of this glass rod is the same as that of the first embodiment in that it is sealed integrally with the pinch portion 11b, but by using a glass rod with low thermal conductivity, This is effective in preventing heat from the filament side from being transmitted to the amalgam 20 side, and from becoming too high.

Note that the initial objective of the present invention can be achieved by using a glass tube stopper member instead of the glass rod stopper member 21, or by using a stopper member of an appropriate shape made of a metal rod or other material.

[Effects of the invention] As described above, according to the invention, the stopper member not only prevents amalgam from falling into the valve, but also prevents the stopper member from moving, thereby preventing cracks in the exhaust pipe, etc. will no longer occur. In addition, since the stopper member was fixed by sealing its base to the pinch part of the flare stem,
The stopper member is easy to fix, and the evacuation process and amalgam injection can be performed with the stopper member already assembled into a part of the stem, which has great effects such as not complicating the evacuation process. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the end of a conventional lamp, Fig. 2 is a sectional view of the end of the lamp showing the first embodiment of the present invention, and Fig. 3 is a sectional view taken along the - line in Fig. 2. , FIG. 4 is a sectional view showing a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Valve, 10a... End face, 11... Stem, 11b... Pinch part, 12... Exhaust pipe, 1
2a... opening, 20... amalgam, 21...
Stopper member, 21a... end.

Claims (1)

[Claims for Utility Model Registration] (1) An exhaust pipe is connected to the flare stem sealed at the end of the valve, and the exhaust pipe is connected to the inside of the valve through an opening formed on the side of the pinch part of the flare stem. In the fluorescent lamp in which the amalgam is stored in the exhaust pipe, a stopper member is provided in the exhaust pipe to prevent the amalgam from escaping, and the stopper member is located between the amalgam and the opening. A fluorescent lamp characterized in that the flare stem is sealed and fixed to the pinch portion of the flare stem. (2) The fluorescent lamp according to claim 1, wherein the amalgam side end of the stopper member is located inside the end face of the bulb. (3) The fluorescent lamp according to claim (2) of the utility model registration, wherein the stopper member is formed of a thin metal plate, and the end of the thin plate on the amalgam side is bent. (4) The fluorescent lamp according to claim (2) of the utility model registration, characterized in that a glass rod or a glass tube is used as the stopper member.