JPH0433105B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for manufacturing a one-end sealed light bulb,
It sometimes relates to a method of manufacturing a one-end sealed incandescent light bulb. [Prior Art] In general, light bulbs are widely used as various light sources, such as light sources for illumination. In an example of a conventional manufacturing method for a one-end sealed light bulb for general lighting, as shown in FIG.
A pair of filament coils 21 and 21 are connected to one end 22 and the other end 23 of the filament coil 21, respectively, and are arranged so as to extend in one direction along the filament coil 21 (downward in the figure). Inner conductor wires 24, 25
and metal foils 26 and 27, which are conductors for sealing, connected to the other ends of these inner conductors 24 and 25, respectively.
, outer conductors 28 and 29 connected to the metal foils 26 and 27, respectively, a supporter 33 whose one end is connected to approximately the center of the filament coil 21, and a supporter 33 for fixing the inner conductors 24 and 25 and the supporter 33. The filament assembly 2 consisting of the fixing glass member 34 is placed with the connecting part 30 between one inner conductor 24 and one end 22 of the filament coil 21 on the front side, and an exhaust pipe is provided at one end for exhausting air and introducing the sealed gas. The filament coil 21 is inserted into the glass tube 1 from the other end opening 14, which has a tube 13 and a sealing tube section 18 at the other end, so that the filament coil 21 is aligned with the tube axis P.
The filament assembly 2 is held such that the connecting portion 30 is located within the exhaust pipe 13 and the filament assembly 2 is located within the sealing tube portion 18 of the glass tube 1 with the metal foils 26 and 27 spaced apart from each other. Then, the sealing tube section 18 of the glass tube 1 is heated to airtightly embed the metal foils 26 and 27 in the sealing tube section 18, and the other end opening 14 is hermetically sealed. A portion 12 is formed. Next, the inside of the glass tube 1 is exhausted through the exhaust pipe 13, and then the glass tube 1 is exhausted through the exhaust pipe 13.
Filled gas is introduced into the chamber. After the introduction of the filled gas is completed, the exhaust pipe 13 is heated to airtightly close the gap and leave the remaining part of the exhaust pipe (hereinafter also referred to as "chip").
11, and in some cases this chip 1
A part of the connecting part 30 is buried and fixed in the inside of the bulb 1, thereby obtaining a light bulb as shown in FIG. [Problems to be Solved by the Invention] When manufacturing a light bulb of the type in which the connecting portion 30 is located inside the exhaust pipe 13 as described above, when the filament assembly 2 is placed inside the glass tube 1, the connecting portion 30 It is necessary to position the tip of the exhaust pipe 13 so that it fits securely within the exhaust pipe 13, but there is a problem in that this task is quite difficult. That is, when placing the filament assembly 2 in the glass tube 1 automatically by a machine, the rear end side of the filament assembly 2 in the insertion direction, that is, the ends of the outer conductors 28 and 29, is usually held with a jig. In this state, the filament assembly 2 is inserted into the glass tube 1. Conventionally, the connecting portion 30, which is the leading side in the insertion direction, is formed into a coil shape at one end 22 of the filament coil 21. For example, a rod-shaped end 241 having a rod shape is inserted and connected at the end of one of the inner conductor wires 24 into the connecting coil portion 221, and the tip of the rod-like end 241 protrudes from the tip of the connecting coil portion 221. When the filament assembly 2 is inserted into the glass tube 1, the rod-shaped end 241 protruding from the connecting portion 30 collides with the inner wall 15 of one end of the glass tube 1, and its movement is obstructed. As a result, an accident occurs in which the metal foils 26 and 27 are bent, and as a result, it is extremely difficult to smoothly fit the connecting portion 30 into the exhaust pipe 13. For this reason, the work of arranging the filament assembly 2 in the glass tube 1 must be done manually by trial and error, which results in low work efficiency and an increase in manufacturing costs. [Object of the Invention] The present invention has been made based on the above-mentioned circumstances, and its object is to smoothly perform the work of arranging a filament assembly at a predetermined position in a glass tube by automatic work using a machine. An object of the present invention is to provide a method for manufacturing a one-end sealed light bulb, which can improve work efficiency. [Means for Solving the Problems] The method for manufacturing a light bulb of the present invention includes a filament coil, an inner conductor wire connected to both ends of the filament coil, and a sealing conductive wire connected to each of these inner conductors. A filament assembly is made up of a filament assembly having a body and outer conductors respectively connected to these sealing conductors, and has an exhaust pipe at one end for exhausting and introducing the sealed gas, and at the other end an exhaust pipe for introducing the sealing part. One end sealing comprising the step of inserting the filament coil into a glass tube having a tube portion from the other end opening so that one end of the filament coil is located in the exhaust pipe and the filament coil extends along the tube axis of the glass tube. In the method for manufacturing a stop-type light bulb, the rod-shaped end of the inner conductor is inserted into a guide coil portion provided at the one end of the filament coil at a connection portion between one end of the filament coil and the inner conductor. The tip of the guide coil part is a free end that protrudes by 1.5 mm or more from the rod-like end, and the filament assembly is inserted from the other end opening of the glass tube with the guide coil part on the front side, thereby forming the guide coil part. is located in the exhaust pipe. [Operation] According to this method, at the connection between one end of the filament coil and the inner conductor, the rod-shaped end of the inner conductor is inserted into the guide coil portion provided at the one end of the filament coil, and the rod-shaped end of the inner conductor is inserted into the guide coil portion provided at the one end of the filament coil. Since the tip of the coil part is a free end that protrudes more than 1.5 mm from the rod-shaped end, when automatically inserting the filament assembly into the glass tube by a machine, the connection part that is the leading side in the insertion direction must be inserted into the glass tube. Even if it collides with the inner wall of one end of the tube, the free end of the guide coil at the tip of the connection bends due to its elastic force, allowing the tip of the connection to align with the inner wall of the one end of the glass tube. As a result, the filament assembly can be automatically guided into the exhaust pipe, making it possible to smoothly place the filament assembly in a predetermined position within the glass tube without deforming the sealing conductor. [Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings. The following example is an example of manufacturing a one-end sealed halogen incandescent light bulb used for general lighting, for example. In this embodiment, as shown in FIG.
A filament coil 21 made of tungsten is connected to one end 22 and the other end 23 of the filament coil 21, and both extend in one direction X (downward direction in the figure) along the filament coil 21. A pair of rod-shaped inner conductor wires 24 and 25 made of, for example, tungsten or molybdenum are arranged, and the inner conductor wire 2
metal foils 26 and 27 which are sealing conductors made of molybdenum and connected to the other ends of the metal foils 26 and 25, respectively; rod-shaped outer conductor wires 28 and 29 made of molybdenum which are connected to these metal foils 26 and 27, respectively; , when forming the filament assembly 2, which consists of a supporter 33 whose one end is connected to the approximate center of the filament coil 21, and a fixing glass agent 34 for fixing the inner conductors 24, 25 and the supporter 33. Filament coil 21 which is the leading side in the direction
Connection portion 30 between one end portion 22 and one inner conductor 24
As shown in an enlarged view in FIG. 2, a guide coil part 221 made of a single coil is provided at one end 22 of the filament coil 21 by pulling out a part of the filament coil 21, for example, and one inner conductor 24 is provided with a guiding coil part 221 made of a single coil. Attach the end to this guide coil part 2.
The rod-shaped end 241 of the inner conductor 24 is connected to the guide coil portion 22.
1 from the proximal end 222 to the distal end 223 to make the distal end of the guide coil portion 221 a free end protruding from the rod-like end 241 by 1.5 mm or more. Then, by holding the filament assembly 2 with its outer conductors 28 and 29 in a jig (not shown) and automatically moving the jig in a direction toward the glass tube 1, which will be described later, by a machine, one end of the filament assembly 2 can be moved. The other end opening 1 of a glass tube 1 made of quartz glass, for example, has an exhaust pipe 13 for exhausting air and introducing a sealed gas at the other end, and has a sealing tube part 18 at the other end.
4 into the glass tube 1 with the connecting part 30 on the leading side, and the filament coil 21 is aligned with the tube axis P.
The filament assembly 2 is held such that the connecting portion 30 is located within the exhaust pipe 13 and the filament assembly 2 is located within the sealing tube portion 18 of the glass tube 1 with the metal foils 26 and 27 spaced apart from each other. do. Here, in the glass tube 1, the inner wall 15 at one end is the exhaust pipe 1.
It is preferable that the connecting portion 30 be formed in the shape of a slope that rises toward the portion where 3 is located because it allows the connecting portion 30 to be moved very easily.The opening angle α of this slope portion is, for example, 90 degrees or more and 120 It is sufficient to keep it within 30 degrees. Next, in this state, the tube part 1 for the sealing part of the glass tube 1 is
8 and heat the metal foils 26 and 27 to seal the pipe part 1.
8 , and the other end opening 14 of the glass tube 1 is hermetically closed to form an airtight sealing portion 12 . Next, the inside of the glass tube 1 is evacuated through the exhaust pipe 13, and then a filler gas such as halogen or inert gas is introduced into the glass tube 1 through the exhaust pipe 13 to a predetermined pressure. . After the introduction of the filled gas is completed, the exhaust pipe 13 is heated to airtightly close the gap to form the chip 11, and in some cases, a part of the connecting portion 30 is closed to the chip 11.
By embedding and fixing the lamp in the lamp, a one-end sealed halogen incandescent lamp is obtained as shown in the third figure. According to the above embodiment, the filament assembly 2
At the connecting portion 30 which is the leading side in the insertion direction into the glass tube 1, the tip of the guide coil portion 221 at the one end portion 22 of the filament coil 21 protrudes by 1.5 mm or more from the rod-shaped end portion 241 of the inner conductor 24. Since it is a free end, when inserting the filament assembly 2 into the glass tube 1 automatically by a machine, it is assumed that the tip of the connecting portion 30 is at one end of the glass tube 1 as shown in FIG. Even if it collides with the inner wall 15, the guiding coil portion 221, which is a free end at the tip of the connecting portion 30, is bent by its elastic force, so that the sloped portion of the inner wall 15 at one end of the glass tube 1 is bent. Even in a relatively gentle case, the tip of the connecting portion 30 is guided into the exhaust pipe 13 along the sloped portion, and as a result, the connection can be made without applying excessive force to the metal foils 26 and 27. The tip of the portion 30 can be reliably positioned inside the exhaust pipe 13, and as a result, the process of arranging the filament assembly 2 into the glass tube 1 can be done automatically by a machine instead of the troublesome manual work. This can be achieved smoothly through operations, and as a result, operating efficiency is significantly improved, and light bulbs can be manufactured at high yields and at low cost. On the other hand, at the connecting portion 30, the rod-shaped end 2
When the protruding length d of the guide coil part 221 protruding from the guide coil part 221 is less than 1.5 mm, the protruding part of the guide coil part 221 does not have sufficient flexibility, and therefore the filament assembly 2 is 1, if the tip of the connecting part 30 collides with the inner wall 15 at one end of the glass tube 1, it may not be able to move along the sloped part of the inner wall 15, and in this case, the filament The insertion of the assembly 2 is obstructed, and an unreasonable force is applied to the metal foils 26 and 27, causing the metal foils 26 and 27 to bend. Eventually, the filament assembly 2 may be bent due to automatic operation by the machine. It cannot be placed in the glass tube 1 in an appropriate posture. [Experimental Example] A specific experimental example that was actually conducted will be described below. Power consumption: 75W (Voltage: 12V, Current: 0.625A) Connection part 30 Length: 4.0mm Outer diameter of inner conductor 24: 0.35mm Outer diameter of wire of filament coil 21: 0.06mm Rod-shaped end of guide coil part 221 Projection length d from part 241: 1.5 mm Based on the above example, 1000 one-end sealed halogen incandescent lamps were actually manufactured under the above conditions.
In the automatic mechanical placement of the filament assembly into the glass tube, no phenomena involving deformation of the metal foil in the filament assembly occur;
The yield of placing this filament assembly into the glass tube was 100%. On the other hand, when we actually produced 1,000 one-end sealed halogen incandescent light bulbs in the same manner as above except that the length of the guide coil protruding from the rod-like end was 1.2 mm, the filament inside the glass tube was In the process of automatically placing the assembly using a machine, phenomena involving deformation of the metal foil in the filament assembly often occur, and in the end, the yield rate for placing the filament assembly in the glass tube in the correct position is 80%. It was low. [Effects of the Invention] As explained above, according to the present invention, one end of the filament coil is connected to the inner conductor and one end of the filament coil, which is the leading side in the direction of insertion of the filament assembly into the glass tube. The rod-shaped end of the inner conductor is inserted into the guide coil section provided in the guide coil section, and the tip of this guide coil section is made into a free end that protrudes by 1.5 mm or more from the rod-shaped end, making it easy to insert the filament assembly into the glass tube. In automatic insertion work, even if the connecting part that is on the leading side in the insertion direction collides with the inner wall of one end of the glass tube, the guide coil part that is the free end at the tip of the connecting part may collide with the inner wall of one end of the glass tube. The filament assembly is bent by its elastic force so that the tip of the connection part is guided into the exhaust pipe along the inner wall of one end of the glass tube, and the filament assembly is smoothly attached to the glass without deforming the sealing conductor. This makes it possible to place the filament assembly in a predetermined position within the tube, and in the end, the filament assembly can be automatically placed inside the glass tube by a machine instead of manually, which significantly improves work efficiency and produces light bulbs at low cost with high yields. can be manufactured.

[Brief explanation of drawings]

FIGS. 1 to 4 are explanatory diagrams of an embodiment of the present invention, and FIGS. 5 and 6 are explanatory diagrams of an example of a conventional method of manufacturing a light bulb. DESCRIPTION OF SYMBOLS 1... Glass tube, 11... Chip, 12... Hermetic sealing part, 13... Exhaust pipe, 15... One end inner wall, 2... Filament assembly, 21... Filament coil, 24, 25... Inner conductor, 26,2
7... Metal foil, 28, 29... Outer conductor wire, 30...
Connection part, 221... Guide coil part, 241...
...rod end.

Claims (1)

[Scope of Claims] 1. A filament coil, inner conductors connected to both ends of the filament coil, sealing conductors connected to these inner conductors, and electrical conductors connected to these sealing conductors, respectively. Insert the filament assembly having an outer conductor wire into a glass tube having an exhaust pipe for exhausting and introducing the sealed gas at one end and a sealing tube section at the other end from the opening at the other end. and positioning one end of the filament coil in the exhaust pipe and positioning the filament coil so as to extend along the tube axis of the glass tube. At the connection between the one end and the inner conductor, insert the rod-shaped end of the inner conductor into the guide coil provided at the one end of the filament coil, and insert the tip of the guide coil by 1.5 mm from the rod-shaped end. The free end should protrude more than mm,
A method for manufacturing a one-end sealed light bulb, characterized in that the filament assembly is inserted from the other end opening of the glass tube with the guide coil section on the leading side, and the guide coil section is positioned in an exhaust pipe.