JP2001068066A - Incandescent light bulbs and incandescent light bulb devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a sealing portion by slidably holding an external lead to a power supply member, to increase a contact area between the external lead and the power supply member, and to provide an electric resistance. Therefore, it is an object of the present invention to provide an incandescent lamp and an incandescent lamp device which can prevent heat generation at a contact portion of the incandescent lamp and make it easy to position the incandescent lamp when attaching the incandescent lamp to a power supply member. SOLUTION: In an incandescent lamp A in which an external lead 5 protrudes from an end of an arc tube 1 containing a filament F, the external lead 5 has a flat portion 5a on at least a part of a portion protruding from the end of the arc tube 1. An incandescent light bulb having:

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incandescent lamp in which external leads protrude from a sealing portion formed at an end of an arc tube.

[0002]

2. Description of the Related Art Conventionally, a tubular incandescent lamp has been widely used as a heat source for fixing employed in a copying apparatus. Such a tubular incandescent lamp is fixed to a substrate in the device,
Power is supplied by an external lead projecting from the end of the arc tube to emit infrared rays. As described above, the following are known incandescent lamps whose external leads protrude from the end of the arc tube. As shown in FIG. 5, a flat terminal T for power supply is welded to the tip of an external lead 50 projecting from the end of the arc tube to the outside.
Are fixed in contact with the power supply member S3 by screws to fix the incandescent lamp at a predetermined position on the base material K in the device.

On the other hand, as shown in FIG. 6, in the case of a conventional incandescent lamp that does not use a flat terminal for power supply, the external lead 50 is directly held by the power supply member S4. Such a technique is described in JP-A-4-136834.

[0004]

However, during operation of the apparatus, the incandescent lamp is turned on and generates heat, so that the base material on which the incandescent lamp is fixed expands. As a result, as shown in FIG. 5, the flat terminal T welded to the external lead 50 and the power supply member S3
Is fixed by screws, the base material K expands in the direction of extension of the tube axis of the incandescent lamp due to expansion, so that a tensile stress is applied to the incandescent lamp, and the sealing portion 1 that seals the external lead 50.
There was a problem that cracks entered in No. 1 and the sealing portion was damaged.

On the other hand, as shown in FIG.
Is directly held by the power supply member S4.
In order to increase the contact area between 0 and the power supply member S4, a part of the power supply member S4 is curved along the external lead 50. However, in practice, all of the curved portions of the power supply member S4 do not completely contact the surface of the external lead 50, but only partially contact the external lead 50. As a result, the contact area is reduced, and when a current flows in a place where the contact area is reduced, the contact portion generates heat, and the external lead 50 and the power supply member S4 are oxidized or burned, resulting in poor contact. I do. For this reason, there is a problem that the incandescent light bulb does not light.

The present invention has been made in view of the above circumstances, and has as its object to prevent breakage of a sealing portion by slidably holding an external lead on a power supply member to prevent breakage of a sealing portion. Increase the contact area with the power supply member,
It is an object of the present invention to provide an incandescent lamp that can prevent heat generation at a contact portion of the incandescent lamp by reducing the electric resistance and can easily perform positioning when the incandescent lamp is attached to a power supply member.

[0007]

According to an aspect of the present invention, there is provided an incandescent lamp in which an external lead protrudes from an end of an arc tube containing a filament. And a flat part is provided in at least a part of a part protruding from an end of the arc tube.

According to a second aspect of the present invention, there is provided the incandescent lamp according to the first aspect, wherein the surface of the flat portion of the external lead is covered with a metal member having higher conductivity than the external lead. It is characterized by the following.

The incandescent lamp according to a third aspect is the incandescent lamp according to the first or second aspect, and in particular, the external lead is provided at a part of the flat portion with the incandescent lamp and the incandescent lamp. It is characterized by having means for positioning a power supply member for supplying a current to the electric bulb.

The incandescent lamp device according to claim 4, wherein the incandescent lamp has an incandescent lamp having an external lead projecting from an end of the arc tube containing the filament, and a power supply member for contacting the external lead of the incandescent lamp. In the device, the external lead of the incandescent lamp has a flat portion formed in at least a part of a portion protruding from an end portion of the arc tube, and the power supply member is a first power supply member.
A first power supply plate and a second power supply plate;
Each of the power supply plates has a planar contact portion arranged in parallel with each other, and the flat portion of the external lead is sandwiched between the planar contact portions of the first power supply member and the second power supply member. It is characterized by being held under pressure.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An incandescent lamp according to the present invention will be described below. FIG. 1 is an explanatory diagram showing the configuration of the incandescent lamp of the present invention. In the incandescent lamp A, sealing portions 11 are formed at both ends of an arc tube 1 made of quartz glass.
Is hermetically sealed with a metal foil 2 made of molybdenum.
An internal lead 3 is connected to the metal foil 2, and the internal lead 3 is connected to a tungsten filament F in the arc tube 1. The filament F is held so as to be located on the tube axis by a plurality of supporters 4 arranged at intervals in the tube axis direction, and both ends are connected to the internal leads 3 respectively. Further, an external lead 5 made of molybdenum is connected to the metal foil 2, and each of the external leads 5 protrudes outside from an end face of the sealing portion 11. This incandescent lamp A has a rating of 100
V, 4A, outer diameter of arc tube 1 is 6 mm, total length is 250 mm
And the sealed gas is argon containing a trace amount of halogen gas.

FIG. 2A is an enlarged plan view of the vicinity of one sealing portion of the incandescent lamp in FIG. 1, and FIG. 2B is a side view of the same. External lead 5 has a diameter of 0.8 mm
The flat portion 5a is formed by pressing or molding at a portion protruding from the sealing portion 11. This flat portion 5a is, as shown in FIG.
The thickness of the external lead 5 is smaller than the diameter of the external lead 5, and the thickness d is 0.4 mm. 5b is
This is positioning means described in detail later.

Next, the connection between the incandescent lamp of the present invention and the power supply member will be described with reference to FIG. The power supply member S is
The first power supply plate S1 and the second power supply plate S2 each include a power supply plate S1 and a second power supply plate S2. The first power supply plate S1 and the second power supply plate S2 each have planar contact portions S11 and S22 for making surface contact with the flat portion 5a of the external lead 5.
Each of the planar contact portions S11 and S2 is separated by a distance smaller than the thickness of the flat portion 5a shown in FIG.
2 are arranged substantially in parallel. In this embodiment, the distance D is 0.2 mm or less. Then, the flat portion 5a of the external lead 5 of the incandescent lamp A is inserted and held in the gap between the first power supply plate S1 and the second power supply plate S2.

With such a configuration, the contact between the flat portion 5a of the external lead 5 and the planar contact portions S11 and S22 is a surface contact, and the contact area can be increased. Accordingly, the current flow between the external lead 5 and the power supply member S is improved, heat generation at the contact portion can be prevented, and oxidation and burning of the external lead 5 and the power supply member S do not occur. Therefore, non-lighting of the incandescent lamp can be prevented.

Further, as shown in FIG. 2, the surface of the flat portion 5a of the external lead 5 is coated with a metal member having higher conductivity than the external lead. In the case of this embodiment, the external lead is made of tungsten, and nickel, which is a metal member having higher conductivity than tungsten, is plated on the flat portion 5a.
The plating layer 7 has a thickness of about 5 to 10 μm. In this embodiment, nickel is used as the metal member, but gold, silver, copper, or tin may be used. In short, any conductive material having higher conductivity than the external leads may be used. As described above, when the surface of the flat portion 5a of the external lead 5 is coated with a metal member having higher conductivity than the external lead, the electric resistance between the flat portion 5a and the power supply member S can be sufficiently reduced, and Heat generation at the contact portion can be further prevented.

Then, as shown in FIG. 3, when the incandescent lamp A is turned on, the temperature of the base K rises and thermal expansion occurs, so that the incandescent lamp A extends in the tube axis extending direction (the direction of the arrow). As a result, the power supply member S also moves in the tube axis extension direction (the direction of the arrow) of the incandescent lamp A.

However, the flat portion 5a of the external lead 5
To a planar contact portion S1 between the first power supply plate S1 and the second power supply plate S2.
1, since only the clamping pressure is held at S22, even if the power supply member S moves due to thermal effects, the power supply member S is configured to rub and move with respect to the flat portion 5a of the external lead 5. In addition, no tensile stress is applied to the external lead 5, and no crack is formed in the sealing portion 11 that seals the external lead 5.

Further, the flat portion 5a of the external lead 5 is
Since the pressure is held between the power supply plate S1 and the second power supply plate S2,
Since the flat portion 5a does not rotate in the gap between the first power supply plate S1 and the second power supply plate S2, it is possible to prevent the incandescent lamp A from rotating against external vibration.

The positioning means 5b is a step portion following the flat portion 5a of the external lead 5, as shown in FIG. Then, as shown in FIG. 3, when the flat portion 5a of the external lead 5 is inserted into the gap between the first power supply plate S1 and the second power supply plate S2, the positioning is achieved by using the positioning means 5b as a mark. The positioning between the electric bulb A and the power supply member S can be facilitated.

In this embodiment, a step portion following the flat portion 5a is shown as the positioning means 5b. However, as another positioning means, as shown in FIGS.
4A, and may be both end portions 5b of a concave portion formed at an intermediate portion of the external lead 5 protruding from the sealing portion 11 as shown in FIG. As shown in FIGS. 4 (b) and 4 (c), when the positioning means 5b is provided on the distal end side opposite to the sealing portion of the external lead 5, the power supply member S is attached as described above. In consideration of the thermal expansion of the base material K, an interval of about 2 mm is provided between the positioning means 5b, the first power supply plate S1, and the second power supply plate S2 as shown in FIGS.

The present invention is not limited to a tubular incandescent lamp. That is, the present invention is applied to an incandescent lamp in which external leads protrude from a sealing portion formed at the end of the arc tube. The effect is obtained.

[0022]

As described above, according to the incandescent lamp of the present invention, the external lead projecting from the incandescent lamp has a flat portion on a part thereof, so that the contact with the power supply member becomes a surface contact. , The contact area can be increased. Therefore, it is possible to prevent heat generation at the contact portion, and it is possible to prevent the external lead and the power supply member from being oxidized and burned, and from being turned off. In addition, since the flat portion of the external lead is merely held by the power supply member, the power supply member rubs against the flat portion of the external lead even if the power supply member moves due to thermal effects. In addition, the incandescent lamp is not subjected to a tensile stress due to a thermal effect, and it is possible to prevent the sealing portion of the incandescent lamp from being damaged.

Further, by covering the flat portion of the external lead with a metal member having higher conductivity than the external lead, the electric resistance between the flat portion of the external lead and the power supply member can be reduced, so that the heat generation at the contact portion is further increased. Can be prevented.

Further, the positioning of the incandescent lamp to the power supply member can be facilitated by providing the positioning means on a part of the flat portion of the external lead.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an incandescent lamp of the present invention.

FIG. 2 is an enlarged explanatory view in the vicinity of one sealing portion of the incandescent lamp shown in FIG.

FIG. 3 is an explanatory diagram illustrating a connection state between an incandescent lamp and a power supply member of the present invention.

FIG. 4 is an explanatory view showing another embodiment of the positioning means formed on the flat part of the external lead in the incandescent lamp of the present invention.

FIG. 5 is an explanatory diagram illustrating a connection state between a conventional incandescent lamp and a power supply member.

FIG. 6 is an explanatory diagram illustrating a connection state between a conventional incandescent lamp and a power supply member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc tube 11 Sealing part 2 Metal foil 3 Inner lead 4 Supporter 5 External lead 5a Flat part 5b Positioning means 7 Plating layer F Filament A Incandescent lamp S Feeding member S11 Planar contact portion of feeding member S22 Planar contact of feeding member Department

Claims (4)

[Claims] 1. An incandescent lamp in which an external lead protrudes from an end of an arc tube containing a filament, wherein the external lead has a flat portion on at least a part of a portion protruding from the end of the arc tube. An incandescent light bulb characterized in that: 2. The incandescent lamp according to claim 1, wherein the surface of the flat part of the external lead is covered with a metal member having higher conductivity than the external lead. 3. The external lead has a means for positioning the incandescent lamp and a power supply member for supplying a current to the incandescent lamp on a part of the flat portion. The incandescent lamp according to claim 2. 4. An incandescent lamp device comprising: an incandescent lamp having an external lead projecting from an end of an arc tube containing a filament; and a power supply member for contacting the external lead of the incandescent lamp. A flat portion is formed on at least a part of a portion protruding from an end of the arc tube, and the power supply member includes a first power supply plate and a second power supply plate, and the first power supply plate and the second power supply plate Have flat contact portions arranged so as to be parallel to each other, and the flat portion of the external lead is pressed by the flat contact portions of the first power supply member and the second power supply member. An incandescent lamp device characterized by being held.