JPH097554A - Both-end sealed incandescent lamp and its manufacture - Google Patents

Abstract

PURPOSE: To improve coaxiality between a luminous tube and a filament and vibration resistance and shock resistance by providing luminous tube contact portions at both ends of a supporter to support the filament for contacting the inside wall of the luminous tube. CONSTITUTION: A supporter 5 has luminous tube contact portions 51 formed by bending one tungsten wire and a linear connection 52 formed in the straight- moving direction of the contact portions 51. The connection 52 is twisted almost at the middle to form a ring locking portion 53 for locking a filament 1. Then, the end of the tungsten wire is further bent to form a projection 54 for constructing a filament assembly F. The assembly F is inserted into a glass tube, the projection 54 is fitted to an exhaust tube and pressed into the opening of the glass tube being heated and the metal foil 3 of the assembly F is pressed and sealed thereto with air-tightness. In this way, a bulb excellent in coaxiality between the luminous tube and the filament can be obtained without loading on the supporter 5 in pressing and sealing processes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-end sealed incandescent light bulb used for Sudagio lighting and stage lighting.

[0002]

2. Description of the Related Art Conventionally, incandescent lamps of both ends sealed type have been widely used to utilize light distribution from a light source for lighting in a studio or a stage. Such a double-ended sealed incandescent light bulb is disclosed in Japanese Utility Model Publication No. 48-18515.

FIG. 4 shows a conventional filament assembly. The double coil type filament 1 is
The inner lead 2 is connected to both ends thereof, and the other end of the inner lead 2 is welded to a metal foil 3 (for example, molybdenum foil). An external lead 4 is welded to the other end of this metal foil 3. Reference numeral 8 is a tungsten supporter for holding the filament 1 in the arc tube.
That is, the fiment assembly F1 is composed of the filament 1, the inner lead 2, the metal foil 3, the outer lead 4 and the supporter 8.

Next, this conventional double-end sealed incandescent light bulb will be described with reference to FIG. FIG. 5 is an explanatory view of a double-end sealed incandescent light bulb. Reference numeral 6 denotes a quartz arc tube, which has an exhaust tube residual portion 61 on a part of its side peripheral surface, and the filament assembly F1 described above has the filament 1 along the tube axis in the arc tube 6. Are held and arranged by the supporters 8. Reference numeral 7 is a pressure-bonding sealing portion in which the metal foil 3 is embedded. Then, in order to improve vibration resistance and impact resistance, and in order to hold the supporter and define the position of the filament, the extension portion 81 of the supporter 8 is crimped together with the metal foil 3 to one crimp sealing portion 7. It is sealed.

[0005]

However, in the manufacturing process, since the extension 81 of the supporter 8 of the filament assembly F1 and the metal foil 3 are simultaneously pressure-bonded and sealed, the extension 81 is formed.
When the tip of the above is tilted in the axial direction of the filament, there is a problem that the extension 81 and the metal foil 3 come into contact with each other if they are pressure-bonded and sealed as they are to cause a short circuit.

Even if the tip of the extension portion 81 does not come into contact with the metal foil 3, if the extension portion 81 is pressure-bonded and sealed while being loaded, the supporter 8 is loaded and, as a result, the filament 1 is loaded. The load is transmitted to the locking portion 82 that is locked, and the coil pitch of the filament 1 is disturbed,
There is a problem that the coaxiality between the tube axis of the arc tube 6 and the axis of the filament 1 is disturbed. That is, the work of simultaneously pressure-bonding and sealing the extension 81 of the supporter 8 and the metal foil 3 requires a considerable amount of skill and is a major factor leading to a reduction in yield.

Furthermore, when the incandescent bulb of both ends sealed type in which the coaxiality of the tube axis of the arc tube 6 and the axis of the filament 1 is disturbed is put into a lighting fixture and turned on, the light distribution pattern does not become a predetermined pattern. was there.

The present invention has been made based on the above circumstances, and an object thereof is to improve the coaxiality between the arc tube and the filament without disturbing the coil pitch of the filament in the step of pressure-bonding and sealing the metal foil. Further, it is to provide a double-end sealed incandescent light bulb having good vibration resistance and impact resistance, and a method for manufacturing the same.

[0009]

In order to solve the above-mentioned problems, the double-end sealed incandescent lamp according to claim 1 has a filament arranged in a tube-shaped arc tube having an exhaust pipe residue on its side peripheral surface. In the incandescent lamp with both ends sealed, in which the filament is supported by the supporter along the tube axis of the arc tube, the supporter contacts the inner wall of the arc tube formed at both ends in the tube axis direction of the arc tube. An arc tube contact portion,
A connecting part for connecting the arc tube abutting part, a locking part for locking the filament formed in the connecting part, and a projection part fitted to the exhaust pipe remainder. To do.

The supporter has ring-shaped or polygonal arc tube contact portions at both ends in the tube axis direction of the arc tube, and extends in the tube axis direction of the arc tube so as to connect the arc tube contact portions. There is a connecting part, and there is a locking part for locking the filament at this connecting part so that the axis of the filament and the tube axis of the arc tube coincide with each other. It is formed integrally from a single linear object.

According to a second aspect of the present invention, there is provided a method of manufacturing an incandescent lamp having both ends sealed, wherein a filament and an internal lead connected to both ends of the filament are provided through one opening of a cylindrical glass tube having an exhaust pipe on a side surface thereof. A series of a metal foil connected to the other end of the inner lead, an outer lead connected to the other end of the metal foil, and a supporter for holding the filament along the tube axis of the glass tube. The filament assembly is inserted, the filament assembly inserts and locks the protrusion formed on the supporter into the exhaust pipe, heats a part of the glass tube, and the inner lead of the filament assembly is inserted. It is characterized in that only the metal foil and the external leads are pressure-bonded and sealed.

[0012]

According to the structure of the present invention, the supporter for holding the filament has the arc tube abutting portions at both ends thereof, and the supporter is in contact with the inner wall of the arc tube at these portions. Can be prevented from moving in the direction perpendicular to the tube axis. Further, the filament can be locked along the tube axis of the arc tube by the locking part formed in the connecting part that connects the arc tube abutting parts at both ends. It is possible to prevent the filament from sagging, which softens at high temperature during lighting, by this locking portion, and it is possible to lock the filament along the tube axis of the arc tube even during lighting. Further, since the supporter is provided with a protrusion and the protrusion is fitted to the remaining portion of the exhaust pipe, it is possible to prevent the supporter from moving in the tube axis direction of the arc tube. As a result, a double-end sealed incandescent lamp having excellent vibration resistance and impact resistance is obtained. Furthermore, since the supporter is not pressure-bonded and sealed, in other words, no load is applied to the supporter in the pressure-bonding and sealing process, so that the coil pitch of the filament is not disturbed and both ends of the arc tube and the filament that are excellent in coaxiality are not disturbed. It becomes a sealed incandescent light bulb.

According to the method of manufacturing a double-end sealed incandescent lamp of claim 2, a filament, inner leads connected to both ends thereof, and a metal foil connected to the other end of the inner lead,
A cylinder having an exhaust pipe on the side peripheral surface of a series of filament assemblies consisting of an external lead connected to the other end of the metal foil and a supporter for holding the filament along the tube axis of the glass tube. The glass tube is inserted through one opening, and the protrusion formed on the supporter is inserted and locked in the exhaust tube. Next, a part of the glass tube is heated, and only the inner lead, the metal foil and the outer lead of the filament assembly are pressure-bonded and sealed. As a result, since the supporter is not pressure-sealed, no load is applied to the supporter. Therefore, no load is applied to the filament locked by the locking part of the supporter,
The coil pitch of the filament is not disturbed during the manufacturing process of the double-end sealed incandescent light bulb, and the coaxiality between the arc tube and the filament can be satisfactorily obtained. And since a part of the supporter is not embedded in the pressure-bonding sealing part in which the metal foil is embedded,
The short circuit phenomenon due to the supporter and the metal foil does not occur. Further, the skill level is not required for the pressure-bonding and sealing step, and the incidence of defective products can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a double-end sealed incandescent light bulb of the present invention will be described below with reference to the drawings. FIG. 1 shows a filament assembly of an incandescent lamp having both ends sealed according to the present application. An inner lead 2 is connected to both ends of the double coil type filament 1, and the other end of the inner lead 2 is welded to a metal foil 3 (for example, molybdenum foil). An external lead 4 is welded to the other end of this metal foil 3. 5
Is a tungsten supporter for holding the filament 1 in the arc tube. The filament assembly F is
It is composed of a filament 1, an inner lead 2, a metal foil 3, an outer lead 4 and a supporter 5.

The supporter will be described in detail. The supporter 5 is made of a single tungsten wire. First, the tungsten wire is bent to form one ring-shaped arc tube contact portion 51, and then the arc tube contact portion 51.
A linear connecting portion 52 is formed in a direction orthogonal to the direction. The connecting portion 52 has a ring-shaped locking portion 53 that locks the filament 1 by twisting it at a substantially intermediate position with the other arc tube abutting portion 51. The locking portion 53 locks the filament 1 by hooking the secondary coil of the filament 1. Then, after forming the other arc tube abutting portion 51 in a ring shape, the tungsten wire is folded back toward the one arc tube abutting portion 51, and the tip thereof is further bent to form the protrusion 54.

Next, the both ends sealed incandescent light bulb of the present invention will be described. FIG. 2 is an explanatory view of the double-end sealed incandescent light bulb of the present invention. Reference numeral 6 denotes a quartz arc tube, which has an exhaust pipe residual portion 61 on a part of its side peripheral surface, and the filament 1 of the above-mentioned filament assembly F is arranged along the tube axis in the arc tube 6. Are held and arranged by the supporter 5. Reference numeral 7 denotes a crimp sealing portion, and the crimp sealing portion 7 presses only the inner lead 2, the metal foil 3 and the outer lead 4 by a mechanical force. The protrusion 54 of the supporter 5 is fitted into the exhaust pipe remaining portion 61. With such a structure, the supporter 5 can be prevented from moving in the tube axis direction of the arc tube 6, and the filament 1 is arranged at a predetermined position. Further, the supporter 5 has arc tube abutting portions 51 at both ends thereof, and since the supporter 5 is in contact with the inner wall of the arc tube 6 at this part, the supporter 5 is perpendicular to the tube axis of the arc tube 6. It can be prevented from moving and the filament 1 is arranged at a predetermined position. That is, filament 1
Is disposed at a predetermined position of the arc tube 6 by the projection 54 of the supporter 5 and the arc tube abutting portion 51, and in a double-end sealed incandescent light bulb having a filament assembly having such a structure, vibration resistance is It has excellent resistance and impact resistance.

Next, a method of manufacturing an incandescent lamp with both ends sealed using the above-mentioned filament assembly will be described. As shown in FIG. 3, the filament assembly F is inserted through one opening of a cylindrical glass tube 60 having an exhaust pipe 610 on its side peripheral surface, and a protrusion formed on the supporter 5 of the filament assembly F. The insertion of the filament assembly F is stopped when the portion 54 is fitted into the exhaust pipe 610. Further, while heating one opening A of the glass tube 60 with a gas burner, the opening A is pinched by, for example, mechanical force, and the metal foil 3 of the filament assembly F is hermetically sealed by pressure. Similarly, the other opening B of the glass tube 60
Also in the above, the metal foil 3 is hermetically pressure-bonded and sealed. In this pressure sealing step, the supporter 5 is not pressure sealed.

Therefore, in the process of pressure-bonding and sealing the metal foil 3, the supporter 5 is independent of the openings A and B of the glass tube 60 to be pressure-bonded and sealed (because it is not in contact), so that the supporter 5 is attached. No load is applied by mechanical force in the pressure-bonding and sealing step, and as a result, no load is applied to the filament 1.

When the double-end sealed incandescent lamp is manufactured in this way, the coil pitch of the filament 1 is not disturbed, and the coaxiality between the arc tube 6 and the filament 1 can be satisfactorily obtained. And since a part of the supporter 5 is not embedded in the pressure-bonding sealing part in which the metal foil 3 is embedded, the supporter 5
And the short circuit phenomenon due to the metal foil 3 does not occur. Further, the skill level is not required for the pressure-bonding and sealing step, and the incidence of defective products can be reduced.

[0020]

According to the first aspect of the invention, the supporter holding the filament has the arc tube abutting portions at both ends thereof, and the supporter is in contact with the inner wall of the arc tube at these portions. It is possible to prevent movement in the direction perpendicular to the tube axis of the arc tube. Further, the filament can be locked along the tube axis of the arc tube by the locking part formed in the connecting part that connects the arc tube abutting parts at both ends. It is possible to prevent the filament from sagging, which softens at high temperature during lighting, by this locking portion, and it is possible to lock the filament along the tube axis of the arc tube even during lighting. Further, since the supporter is provided with a protrusion and the protrusion is fitted to the remaining portion of the exhaust pipe, it is possible to prevent the supporter from moving in the tube axis direction of the arc tube. As a result, a double-end sealed incandescent lamp having excellent vibration resistance and impact resistance is obtained. Furthermore, since the supporter is not pressure-bonded and sealed, in other words, no load is applied to the supporter in the pressure-bonding and sealing process, so that the coil pitch of the filament is not disturbed and both ends of the arc tube and the filament that are excellent in coaxiality are not disturbed. It becomes a sealed incandescent light bulb.

[0021] According to the method of manufacturing a double-end sealed incandescent lamp of claim 2, a filament, internal leads connected to both ends thereof, and a metal foil connected to the other end of the internal lead,
A cylinder having an exhaust pipe on the side peripheral surface of a series of filament assemblies consisting of an external lead connected to the other end of the metal foil and a supporter for holding the filament along the tube axis of the glass tube. The glass tube is inserted through one opening, and the protrusion formed on the supporter is inserted and locked in the exhaust tube. Next, a part of the glass tube is heated, and only the inner lead, the metal foil and the outer lead of the filament assembly are pressure-bonded and sealed. As a result, since the supporter is not pressure-sealed, no load is applied to the supporter. Therefore, no load is applied to the filament locked by the locking part of the supporter,
The coil pitch of the filament is not disturbed during the manufacturing process of the double-end sealed incandescent light bulb, and the coaxiality between the arc tube and the filament can be satisfactorily obtained. And since a part of the supporter is not embedded in the pressure-bonding sealing part in which the metal foil is embedded,
The short circuit phenomenon due to the supporter and the metal foil does not occur. Further, the skill level is not required for the pressure-bonding and sealing step, and the rate of defective products can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of a filament assembly of an incandescent lamp having both ends sealed according to the present invention.

FIG. 2 is an explanatory view of a double-end sealed incandescent light bulb of the present invention.

FIG. 3 is an explanatory view of a method for manufacturing an incandescent lamp with both ends sealed according to the present invention.

FIG. 4 is an explanatory view of a filament assembly of a conventional double-end sealed incandescent lamp.

FIG. 5 is an explanatory diagram of a conventional double-end sealed incandescent light bulb.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filament 2 Inner lead 3 Metal foil 4 External lead 5 Supporter 51 Arc tube abutting part 52 Coupling part 53 Locking part 54 Projection part 6 Arc tube 60 Glass tube 610 Exhaust pipe 7 Crimping sealing part 8 Supporter 81 Extension part F Filament Assembly F1 filament assembly

Claims (2)

[Claims] 1. A double-end sealed incandescent light bulb in which a filament is arranged in a tubular arc tube having an exhaust tube remainder on its side surface and the filament is supported by a supporter along the tube axis of the arc tube. The supporter is formed on both ends of the arc tube in the axial direction of the arc tube, the arc tube contact portions contacting the inner walls of the arc tube, the connecting portion connecting the arc tube contact portions, and the support portion formed on the connecting portion. A double-end sealed incandescent light bulb, comprising: a locking portion that locks the filament, and a protrusion that fits into the remaining portion of the exhaust pipe. 2. A method of manufacturing a double-end sealed incandescent light bulb, comprising: a filament and an internal lead connected to both ends of the filament through one opening of a cylindrical glass tube having an exhaust pipe on a side surface thereof. With a metal foil connected to the other end of this internal lead,
An external lead connected to the other end of the metal foil, and a series of filament assemblies including a supporter for holding the filament along the tube axis of the glass tube are inserted, and the filament assembly is The protrusion formed on the supporter is inserted into and locked in the exhaust pipe, and a part of the glass pipe is heated so that only the inner lead of the filament assembly and the metal foil and the outer lead are pressure-bonded and sealed. And a method for manufacturing an incandescent light bulb with both ends sealed.