JPH0845431A - Manufacture of tubular bulb - Google Patents

Abstract

PURPOSE:To provide a method for the manufacture of a tubular bulb, capable of keeping a luminous section free from the remnant of a sealed and cutout tip end in a luminous section. CONSTITUTION:A tubular bulb body A is formed, with sealing cylindrical sections 2 and 3 projected from both sides of a luminous section 1 for housing luminous materials H, and the sections 2 and 3 are sealed to form sealing sections 4 and 5 at both sides of the luminous section 1. Furthermore, the luminous materials H are formed to extend from the sealing sections 4 and 5 to the inside of the luminous section 1. A tip-less tubular bulb is thereby manufactured. In this case, a tip 8 is connected to one of the sections 2 and 3. Then, the luminous materials H are inserted into both sections 2 and 3 and positioned in the luminous section 1. Thereafter, the section 2 or 3 without the tip 8 is first sealed, and one of the materials H is buried in the sealing section 4 or 5. Then, the section 2 or 3 with the tip 8 connected is sealed at a position farther therefrom viewed from the luminous section 1. Subsequently, the whole of the tubular bulb body A is internally exhausted via the tip 8, and the luminous section 1 is charged with necessary element 18. Also, a section agreeing to the tip 8 or a section nearer the luminous section 1 than the tip 8 viewed therefrom is sealed, while the element in the luminous section 1 being cooled. Finally, the sections of the cylindrical sections 2 and 3 on the side of the tip 8 at positions farther from the sealing sections 4 and 5 are cut out, together with t tip 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel tube manufacturing method in which a chip tube sealing trace is not finally generated for exhausting the tube or filling the tube with contents.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a conventional bulb (C '), in which sealing portions (4') and (5 ') are projected on both sides of a light emitting portion (1') and a tip tube (8 ' ) Is a light emitting part.
In the example protruding to (1 '), a voltage is applied between the electrodes (6') (7 '), an arc is generated between the electrodes (6') (7 '), and the light emitting part (1') When a strong light is generated, there is a problem that a part of the light is diffusely reflected by the chip tube sealing mark (8a ′), which adversely affects the irradiation surface. Therefore, the appearance of a tube in which such a chip tube sealing mark (8a ′) does not occur in the light emitting portion (1 ′) has long been awaited by the parties concerned.

[0003]

The problem to be solved by the present invention is to develop a method for manufacturing a tube in which at least a trace of cutting of the tip tube is not left on the light emitting portion.

[0004]

According to the method of the present invention, a sealing tubular portion (2) is provided on both sides of a light emitting portion (1) for housing a light emitting body (H).
(3) is projected to form the tube body (A), and the sealing cylinder portion is formed.
(2) (3) is sealed to form sealing parts (4) and (5) on both sides of the light emitting part (1) and a pair of electrodes (69) (7) or filament (61)
In a method for manufacturing a bulb in which a light emitting body (H) such as the one described above is formed in the light emitting section (1) from the sealing sections (4) and (5), a chip tube is provided in one of the sealing tube sections (3). Connect the (8), then insert the luminous body (H) into both tube parts (2) and (3) to attach the luminous body (H) to the luminous part.
Installed in (1), first seal the tube part (2) without the chip tube (8) and then the luminous body (H)
One is embedded in the sealing part (4), and then the tube part (3) to which the chip tube (8) is connected is located at a position farther from the chip tube (8) when viewed from the light emitting part (1). ) Is sealed, then the inside of the bulb body (A) is exhausted through the tip tube (8), and the necessary gas and the necessary element (18) are filled in the light emitting part (1). While cooling the necessary gas and necessary elements (18), seal the position matching the chip tube (8) or the part closer to the light emitting part (1) than the chip tube (8) when viewed from the light emitting part (1). The part of the tip tube side tube part (3) farther than the sealing part (5) is cut off together with the tube (8).

Since the tip tube (8) is not provided in the light emitting part (1) but is provided in the one tube part (3), the chip tube (8) is sealed when the tube part (3) is sealed.
It is possible to eliminate the unevenness of the brightness of the irradiation surface due to diffused reflection, which is a problem of the conventional bulb in which the tip tube (8) is provided in the light emitting part (1) as in the past. I was able to.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.
(A) is a tube body having tubular portions (2) and (3) formed at both ends, and the material thereof is, for example, quartz glass or hard glass. A tip tube (8) is attached to one of the tubular portions (3) and communicates with the inside of the tubular portion (3).

The luminous body (H) has, for example, electrodes (6) (7) and a filament (61) for generating an arc. In the case of FIG. 1, the luminous body (H) is the electrode (6), and the coiled electrode part (6b) is attached to the tip of the electrode rod (6a) to form the molybdenum metal foil (9). The external lead rod (10) is connected via.

(7) is the other electrode, which is similar to the above-mentioned electrode rod (7a)
It is provided on the coiled electrode part (7b) at the tip of the, the other external lead rod (12) is connected through the molybdenum metal foil (11), and the tip tube (8) side external Lead bar (1
2) is a temporary fixing bar through the molybdenum metal foil (13) for temporary fixing
It is connected to (14). Molybdenum Metal Foil (9) (11) (13)
When the tube body (A) is quartz glass, and when the tube body (A) is hard glass, the molybdenum metal foil (9) (11) (13) is used as shown in FIG. ) Is unnecessary and the electrode rods (6a) and (7a) are pulled out as they are.

Next, the manufacturing method of the first embodiment will be described. First, in an inert atmosphere, insert one electrode (6) on the side of the tube (2) where the tip tube (8) is not provided, and heat the part (a) that is almost coincident with the molybdenum metal foil (9). Then, the pinch seal is performed to form the pinch seal part (4) at one end of the light emitting part (1).

Next, a place (b) where the temporary fixing torch (15) substantially coincides with the temporary fixing molybdenum metal foil (13) of the cylindrical portion (3).
Is heated to perform a pinch seal, and the molybdenum metal foil (13) for temporary fixing is embedded in the pinch seal part (19) for temporary fixing.

After that, after connecting the tip tube (8) to an exhaust device (not shown), the exhaust device is operated to activate the light emitting part (1),
Air in the space on the light emitting portion (1) side of the tubular portion (3) and the tip tube (8) is exhausted almost completely. During this time, the lower half of the pinch seal part (4) and the light emitting part (1) is immersed in liquid nitrogen (17) to be cooled.

When the exhaust is completed, a necessary gas and a necessary substance (18) necessary for the light emitting section (1) are charged from the tip tube (8),
It is filled in the light emitting part (1). Light emitting part (1) and pinch seal part
Since (4) is cooled by liquid nitrogen (17), the necessary gas and necessary substance (18) are cooled and accumulated in the lower part of the light emitting part (1). In this state, the tip tube (18) is heated and sealed. The required gas and the required substance (18) differ depending on the type of tube, but in the case of the first embodiment, the required substance is scandium or esprosium.

Finally, the position (c) corresponding to the molybdenum metal foil (11) is heated by the sealing torch (16) to perform pinch sealing to form the pinch seal portion (5). Finally, the tubular portion (3) is cut together with the tip tube (8) at the outer end portion (d) of the pinch seal portion (5) to form a tipless bulb as shown in FIG. When the processing of the tube is completed, white heat insulation coating (20) is applied to the vicinity of the pinch seal parts (4) and (5) and the pinch seal parts (4) and (5) of the light emitting part (1).

It should be noted that the tip tube (8) is not closed, and a position corresponding to the molybdenum metal foil (11) is evacuated and the sealing torch (1
Heat at 6) and perform a pinch seal to remove the pinch seal.
(5) may be formed. In this case, pinch seal (5)
It is possible to eliminate most of the impure gas, such as H ₂ O gas, which is occluded in the tubular portion (3) generated from the heated portion during the formation of the gas.

2 and 3 show a second embodiment of the present invention. In this case, the molybdenum metal foil (13) for temporary fixing and the rod for temporary fixing are shown.
Without providing (14), the tip tube (8) is connected to the portion between the molybdenum metal foil (11) and the light emitting portion (1), the so-called coldest portion. First, in the same manner as described above, a pinch seal part (4) is formed on one side of the light emitting part (1) by a pinch seal in an inert atmosphere, and then matched with the molybdenum metal foil (11) of the other tube part (3). The portion to be heated is heated with a torch (16) and pinch-sealed to seal only the outer half (5a) of the pinch-sealed portion (5). At this stage, the tip tube (8) communicates with the light emitting section (1).

In this state, the light emitting part (1) and the space of the light emitting part (1) side of the tubular part (3) are evacuated from the tip tube (8), and then the required gas and the necessary substance (18) are passed through the tip tube (8). ) Is filled in the light emitting part (1), and the tip tube (8) is sealed off as described above, and then, as shown in FIG.
The outer half (5a) is pinched and the pinch seal part (5) is heated again with the torch (16) to seal the other half (5b) of the pinch seal part (5) and the pinch seal The whole part (5) is sealed. Lastly, the unnecessary portion of the tube portion (3) is cut off. At this time, if the remaining portion of the tip tube (8) is also cut off, a tipless bulb having an excellent outer shape is obtained. When the processing of the tube is completed, white heat insulation coating (20) is performed as described above.

As described above, in the second embodiment, the pinch seal portion
(5) is formed by sealing twice so that the trace of the chip tube (8) provided at the base of the pinch seal part (5) does not remain in the bulb body (A).

FIG. 4 shows an example in which hard glass is used for the tube body (A). Since the expansion coefficient of the electrode rods (6a) and (7a) and the tube body (A) are almost the same, molybdenum metal is used. The foils (9) and (11) are not required, and the sealing portions (4) and (5) can be formed by heating and shrinking the tubular portions (2) and (3).

Further, FIG. 5 shows the case where the filament (61) is used as the light emitting body (H), but similarly to the above, the case where the quartz glass and the molybdenum metal foil are used as shown in the drawing, but not shown. In some cases, hard glass is used without the molybdenum metal foil.

[0020]

According to the present invention, since there is no chip tube sealing mark in the light emitting portion, it is possible to eliminate the unevenness of the brightness of the irradiation surface due to diffused reflection, which is a problem of the conventional bulb.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state in which one side is pinch-sealed and the other side is heated in the first embodiment of the method of the present invention.

FIG. 2 is a cross-sectional view showing a state in which one side is pinch-sealed and the other outer half is pinch-sealed in the second embodiment of the method of the present invention.

FIG. 3 is a sectional view showing a state in which the remaining inner half is pinch-sealed in the second embodiment of the method of the present invention.

FIG. 4 is a sectional view showing a state in which one side is pinch-sealed and the other side is heated in the third embodiment of the present invention.

FIG. 5 is a sectional view showing a state in which one side is pinch-sealed and the other side is heated in the fourth embodiment of the present invention.

FIG. 6 is a sectional view of a tipless tube of the present invention.

FIG. 7 is a sectional view of a conventional tube.

[Explanation of symbols]

 (A) ... Tube body (H) ... Light emitter (1) ... Light emitting part (2) (3) ... Sealing cylinder part (4) (5) ... Sealing part (8) ... Chip tube (18) ... required elements

Claims (1)

[Claims] 1. A tube body is formed by projecting a sealing cylinder on both sides of a light emitting portion for housing a light emitting body, and the sealing cylinder is sealed to seal both sides of the light emitting portion. In a method of manufacturing a chipless bulb in which a light emitting body such as a pair of electrodes or a filament is formed in the light emitting portion from the sealing portion while forming a portion, a chip tube is connected to one sealing cylinder portion, Next, the light emitting body is inserted into both the cylindrical parts and the light emitting body is installed in the light emitting part, and the cylindrical part without the chip tube is first sealed and one of the light emitting bodies is embedded in the sealing part.
Next, at the position farther from the tip tube as seen from the light emitting part, the tube part to which the tip tube is connected is sealed, then the inside of the bulb body is exhausted through the chip tube and the necessary elements are filled in the light emitting part Then, while cooling the necessary elements in the light emitting part, the position matching the chip tube or the part closer to the light emitting part than the chip tube viewed from the light emitting part is sealed, and together with the chip tube, the sealing part of the chip tube side tube part A method of manufacturing a tube, which comprises cutting away a distant portion.