JPS59163736A - Manufacture of luminous tube for discharge lamp - Google Patents

Abstract

PURPOSE:To eliminate the coolest point at the center part of a luminous tube and also a clog of sealing material by attaching the exhaust tube at the center of a luminous tube to the end part of the luminous tube. CONSTITUTION:An electrode 9 and an exhaust tube 12 are inserted into one end of a main tube 1, and the other end of the main tube 1 is fitted to be installed in the end concavity 15 of an electrode holding member 14, so that the electrode holding member 14 holding an electrode 9' may insert the electrode 9' into the main tube inside, and is held and mounted there. An insert gas 11 is introduced in the main tube 1 through an inert gas introducing tube 10 connected to other open end of the exhaust tube 12 installed on an electrode holding member 13, and atmosphere within the main tube is replaced with an inert gas. Subsequently, one end of the main tube 1 is heated and melted by a gas burner etc. from outer peripheral side and sealed by a press head. Special processing is applied to this press head so that the exhaust tube 12 may not be sealed upon the press plane of the head when one end of the main tube is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an arc tube for a discharge lamp, and particularly to a method for attaching an exhaust pipe for exhausting an arc tube or an enclosure tube for filling an enclosure.

Conventionally, arc tubes for discharge lamps have been manufactured by the steps shown in FIGS. 1(a) to 1(h). That is, according to the conventional manufacturing of an arc tube for a discharge lamp, first, as shown in FIG. 1(a), a main tube 1 that will become an arc tube is cut to a predetermined size. Next, on both ends of this main pipe l, as shown in Figure 1 (b
), the end plates 2, 2' are applied, and at the same time the central part of the main pipe 1 is heated and melted by a gas burner 3, etc., and the introduction pipe is directed into the main pipe 1 through one end plate 2. 4
Inert gas 5 is introduced and pressurized, and the heated and melted portion is blown out by the pressure inside the main pipe 1 due to this inert gas (FIG. 1(C)).

Then, as shown in FIG. 1(d), the exhaust pipe 6 is welded to the blown-out part as described above using a gas burner 3, etc., and is connected to the inside of the main pipe 1 (see FIG. 1(d)). e)).

One end of the main pipe 1 formed in this manner is closed with a sealing cap 7, and an electrode 9 held by an electrode holder 8 is inserted from the other end into the main pipe 1, as shown in FIG. 1(f). inserted into. Thereafter, an inert gas introduction pipe 10 is connected to the open end of the exhaust pipe 6 which is connected and conducted to the center of the main pipe 1, and the inert gas 11 is caused to flow from the introduction pipe 10 through the exhaust pipe 6 and into the main pipe 1. . Next, the electrode insertion end of the main pipe 1 is heated and melted from the outside using a gas burner (not shown) or the like, and the electrodes are sealed using a press head (not shown) or the like as shown in FIG. 1(g).

Also, remove the cap 7 from the main pipe 1 at one end of the main pipe 1,
After the main pipe 1 is turned upside down and set as shown in Fig. 1(f), the electrodes 9' are placed inside and sealed through the same process as explained in Fig. 1(f). be done. This completes the arc tube.

However, in the conventional manufacturing method for arc tubes for discharge lamps described above, the exhaust pipe at the center of the main arc tube is removed after exhausting, but it cannot be removed completely, and this part becomes the coldest point of the arc tube and is not sealed. It was difficult to produce an arc tube with stable characteristics due to the condensation of substances. Moreover, in the conventional method, the connection port of the exhaust pipe is small, the ability to exhaust impure gas inside the arc tube is low, and the yield is poor due to clogging with fillers, etc., and it is not possible to provide an arc tube with stable characteristics. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the conventional manufacturing method, and to eliminate the coldest point in the center of the arc tube by attaching the exhaust pipe in the center of the arc tube to the end of the arc tube. An object of the present invention is to provide a method for manufacturing an arc tube for a discharge lamp without clogging.

Hereinafter, preferred embodiments of the method for manufacturing an arc tube for a discharge lamp according to the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 2, FIG. 3, and FIG. 4 show an embodiment of the method for manufacturing an arc tube for a discharge lamp according to the present invention in the order of its steps.

According to this embodiment, an electrode 9 and an auxiliary electrode 18 are disposed at one end of the main pipe 1 made of quartz glass processed into a pot shape so as to sandwich the outer periphery of the exhaust pipe 12. The poles 18 are held in the electrode holder 13 via molybdenum foils 19 and 19' and terminal wires 20 and 20', respectively, and the exhaust pipe 12 between the electrode 9 and the auxiliary pole 18 is also held in the electrode holder 13. Fixed.

At this time, the electrode 9 and the exhaust pipe 12 are inserted into one end of the main pipe 1. At this time, the other end of the main pipe 1 is fitted with a device that fits the other end of the main pipe into the end face recess 15 of the electrode holder 14 holding the electrode 9', so that the electrode 9' is inserted into the main pipe. , which keeps it fixed.

In this state, the inert gas 11 is introduced into the main pipe 1 by the inert gas introduction pipe 10 connected to the other open end of the exhaust pipe 12 attached to the electrode holder 13, and the inside of the main pipe is The atmosphere is replaced with an inert gas. Next, one end of the main pipe 1 is heated and melted from the outer circumferential side using a gas burner (not shown) or the like, and sealed by a press head (not shown). This press head is specially processed to prevent the exhaust pipe 12 from being sealed on the press surface of the head when sealing one end of the main pipe.

The main pipe 1 whose one end is sealed as shown in FIG. 3 is then sealed at the other end. At this time, only the peripheral support of the electrode holder 14, that is, the main tube support 16, is lowered, and the electrode holder 17, which is placed in the center of the main tube support and holds the electrode 9' at its tip, remains stationary. However, the main pipe 1 is held and fixed by an electrode holder 13 via an electrode 9 and an exhaust pipe 12 which are fixed to one end when the end is sealed.

In order to support the main pipe 1 in such a simple manner, it is therefore preferable to position the main pipe 1 so that it is hung vertically by the electrode holder 13 as in this embodiment. However, it is of course not limited to this.

Thereafter, the other end of the main pipe 1 is heated to a sealable temperature by a gas burner or the like in the same manner as described above, and is sealed by a press head (not shown) for the other end.

As a result, the discharge lamp arc tube is completed as shown in FIG.

As explained above, according to the present invention, an exhaust pipe for exhaust is provided at one end or both ends of the main pipe serving as the arc tube, and a power lead-in line is installed around the outer circumference of the exhaust pipe. The cold part can be the tube end, making it possible to freely control the temperature of the coldest part of the arc tube. In addition, in addition to eliminating the clogging of the enclosed material at the connection between the exhaust pipe and the main pipe as in the past, the diameter of the exhaust pipe can be increased, and by increasing the ability to exhaust impurity gas in the arc tube, It is possible to provide an arc tube with stable characteristics.

In the above-mentioned embodiments of the present invention, the exhaust pipe is attached to the sealing portion at one end, but the same effect can be obtained even if the exhaust pipe is attached to the sealing portion at both ends.

[Brief explanation of the drawing]

FIGS. 1(a) to (h) are partial front views showing a conventional method for manufacturing a discharge lamp luminous tube in order of process, and FIGS. FIG. 3 is a partial cross-sectional view illustrating a method for manufacturing a tube in the order of steps; DESCRIPTION OF SYMBOLS 1... Main pipe, 9,9'... Electrode, 10... Inert gas introduction pipe, 11... Inert gas, 12... Exhaust pipe, 13° 14... Electrode holder, 18... Auxiliary pole, 1
9, 19'...Molybdenum foil, 20, 20'...
・Terminal wire. Note that the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 171 - JP-A-59-163736 (4)

Claims (1)

[Claims] A method for manufacturing an arc tube for a discharge lamp, characterized in that an exhaust pipe for exhaust is provided at the end of the arc tube, and a power lead-in line is installed around the outer periphery of the exhaust pipe.