JPH1131481A - Tubular incandescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubular incandescent lamp which is capable of easily mounting a base on the sealed part of the tubular incandescent lamp without using an adhesive, simplifying work and preventing load from being applied from an external lead rod to the sealed part. SOLUTION: For a lamp, bases 3 are fitted to sealed parts 11 formed at both ends of a tubular sealed body 1 without using an adhesive and leads 5 are guided from the side faces 3a of the bases 3 tothe direction of crossing the tube axis of the tubular sealed body 1. The base 3 has an opening 30 to fit the sealed part 11 thereto and a lead guide hole 31 to guide the lead 5 formed in the direction of crossing the opening 30 to the side face 3a of the base 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube-type incandescent lamp used in a printer fixing device or an industrial heating device.

[0002]

2. Description of the Related Art A tube-type incandescent lamp incorporated in a conventional printer fixing device or industrial heating device has sealing portions formed at both ends of a tube-shaped envelope made of quartz or the like, and a ceramic is formed on each sealing portion. A base made of a heat-resistant insulating material such as

In such a tube-type incandescent lamp, if the lead wire led out from the base is led out from the side surface of the base in a direction perpendicular to the tube axis of the tube-shaped envelope, the lead wire is drawn from the bottom surface of the base. Compared to the one that is led out in the direction of the tube axis of the mold envelope, the length of the tube-type incandescent lamp including the lead wire in the axial direction is shortened, and the space required for attachment to the device is reduced, so that the device can be downsized. There is an advantage.

In recent years, a base attached to a sealing portion of a tubular incandescent lamp tends to be attached without using an adhesive. This is because the adhesive is hygroscopic, and if moisture is absorbed by the adhesive, the insulation will be reduced.To avoid this problem, use an adhesive in the sealed part of the tubular incandescent lamp. Without attaching the base.

A conventional tube-type incandescent lamp of this type will be described with reference to FIG. FIG. 7A is an enlarged cross-sectional view of one end of the tubular incandescent lamp, and FIG. 7B is a cross-sectional view in the XX direction. Sealing portions 11 are formed at both ends of a tubular sealing body 1 made of quartz glass, and a filament 2 is arranged inside the tubular sealing body 1 so as to coincide with the tube axis. Sealing part 11
, A heat-resistant insulating base 6 is attached, and an external lead rod 4 extending from the sealing portion 11 in the base 6 is connected to a lead wire 5. The lead wire 5 is led out from the side surface 6 a of the base 6 in a direction orthogonal to the tube axis of the tube-shaped sealing body 1.

The sealing portion 11 is fitted in an opening 60 formed in the base 6, and the external lead bar 4 is
Is inserted into the external lead rod accommodation hole 61 following the above. On the other hand, the end of the lead wire 5 is inserted into a lead wire accommodation hole 62 formed in the base 6.
2 and the external lead rod accommodation hole 61 are connected in the base 6. Further, the base 6 has an external lead rod accommodation hole 61.
And a through hole 63 is formed in a direction intersecting with the lead wire accommodating hole 62.

Then, the end of the external lead rod 4 accommodated in the external lead rod accommodation hole 61 is projected into the through hole 63,
In a state where the end of the lead wire 5 and the end of the external lead rod 4 are in contact with each other, welding or soldering is performed in the through hole 63. As a result, a structure is provided in which the base 6 is attached to the sealing portion 11 without using an adhesive, and the lead wire 5 is led out in a direction perpendicular to the tube axis of the tube-shaped envelope 1.

[0008]

However, in the conventional tubular incandescent lamp, the external lead rod 4 and the lead wire 5 are welded in the through hole 63 formed in the base 6, so that both openings of the through hole 63 are opened. Spot welding must be performed by inserting a welding pin from the beginning, and there is a problem that such an operation is extremely troublesome and requires time and effort. In addition, even when soldering is performed instead of spot welding, there is a problem that the work of pouring the solder into the through-hole 63 having a small opening diameter is extremely troublesome and time-consuming.

Further, the outer diameter of the outer lead rod 4 and the inner diameter of the outer lead rod receiving hole 61 are substantially equal, and the inner diameter of the outer lead rod receiving hole 61 is only slightly larger. When this tube-type incandescent lamp is attached to an industrial heating device or the like with the lead rod 4 inserted,
When a load is applied to the base 6, the load is directly transmitted to the external lead bar 4, and there is a problem that a crack occurs in the sealing portion 11. Further, there is a problem that when the crack grows, the sealing portion 11 is damaged.

The present invention has been made in view of the above circumstances, and an object of the present invention is to easily attach a base to a sealed portion of a tubular incandescent lamp without using an adhesive. An object of the present invention is to provide a tube-type incandescent light bulb that achieves simplification of operation and prevents a load from being applied to a sealing portion from an external lead rod.

[0011]

According to a first aspect of the present invention, there is provided a tube-type incandescent lamp according to the first aspect, wherein each of the sealing portions formed at both ends of the tube-shaped envelope has a heat-resistant insulating base. Are fitted without an adhesive, and a lead wire is led out from a side surface of each of these bases in a direction perpendicular to a tube axis of the tube-shaped sealing body. And a lead wire lead-out hole formed in a side surface of the base in a direction intersecting with the opening.

According to a second aspect of the present invention, there is provided the tube-type incandescent lamp according to the first aspect, wherein the lead wire lead-out hole of the base is formed over the bottom surface of the base. I do.

According to a third aspect of the present invention, there is provided a tube-type incandescent lamp according to the first or second aspect, particularly, an outer surface of the tube-type incandescent lamp on the inner surface of the base on the opening side. A protrusion is formed so as to be in contact with the end face of the sealing portion from which the lead bar projects.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a tube-type incandescent lamp of the present invention. Sealing portions 11 are formed at both ends of a tubular sealing body 1 made of quartz glass, and a filament 2 is arranged inside the tubular sealing body 1 so as to coincide with the tube axis. A heat-resistant insulating base 3 is attached to each of the sealing portions 11, and an external lead bar 4 and a lead wire 5 extending from the sealing portion 11 in the base 3 are connected. The lead wire 5 is led out from the side surface 3 a of the base 3 in a direction perpendicular to the tube axis of the tube-shaped sealing body 1.

FIG. 2A is an enlarged sectional view of one end of the tubular incandescent lamp shown in FIG. 1, and FIG.
It is sectional drawing of the XX direction shown to (a). The sealing portion 11 of the tubular incandescent lamp is fitted in an opening 30 formed in the base 3, and the external lead rod 4 is connected to the end of the lead wire 5 in the opening 30 by welding or the like. Have been. The lead wire 5 is led out in a direction perpendicular to the tube axis of the envelope 1 from a lead wire lead-out hole 31 formed on the side surface 3 a of the base 3 near the bottom surface 3 b in a direction intersecting with the opening 30. Have been. Since the other base has the same structure, the description is omitted.

Next, a method of attaching the base 3 to the sealing portion 11 of the tubular incandescent lamp will be described with reference to FIG. As shown in FIG. 3A, the end of the lead wire 5 is inserted into the base 3 from the outlet hole 31 of the base 3, and the end is pulled out from the opening end 30a of the opening 30 of the base 3. As shown in FIG. 3B, the end of the lead wire 5 and the tip of the external lead rod 4 are joined by welding or the like so that the lead wire 5 and the external lead rod 4 are substantially orthogonal to each other outside the base 3. Thereafter, the base 3 is moved as shown in FIG.
3 and the opening 30a of the base 3 are aligned.
As shown in (d), the sealing portion 11 is connected to the opening 30 of the base 3.
Fits. At this time, since at least a part of the outer peripheral surface of the sealing portion 11 is in contact with the inner peripheral surface of the opening 30, the base 3 is fixed without falling off the sealing portion 11. Therefore, the base 3 can be easily attached to the sealing portion 11 of the tubular incandescent lamp without using an adhesive, and the operation can be simplified. 3 (d) and FIG.
As shown in (a), when the base 3 is fixed to the sealing portion 11, the lead wire 5 is led out of the lead-out hole 31 in a natural state, so that a load is applied to the lead wire 5. No load is applied to the joint between the lead wire 5 and the external lead bar 4.

Further, as shown in FIG. 4, a sealing portion 11 in which the external lead bar 4 protrudes inside the base 3 at a position where the end of the external lead bar 4 does not contact the bottom surface 3b of the base 3. May be formed so as to be in contact with the end surface 11a. The same reference numerals as those in FIG. 2 indicate the same parts. With such a structure, when a tubular incandescent lamp is incorporated into an industrial heating device or the like, even if a load is applied to the base 3,
Since the external lead rods 4 only protrude into the space of the opening 30 of the base 3 and the load is not directly transmitted to the external lead rods 4, the outer lead rods 4 are most buried in the structure. A load is not applied to the sealing portion 11 of the weak portion, and the occurrence of cracks can be prevented.

Next, another embodiment of the tubular incandescent lamp of the present invention will be described. FIG. 5 is an enlarged sectional view of one end of another embodiment of the tube-type incandescent lamp of the present invention. The lead-out hole 31 provided in the side surface 3a of the base 3 is formed over the bottom surface 3b. The same reference numerals as those in FIG. 2 denote the same parts, and a description thereof will not be repeated. Also, the other end has the same structure, and the description is omitted.

As shown in FIG. 6, when the tip of the lead wire 5 is inserted into the opening 30 of the base 3 from the outlet hole 31 of the base 3, the outlet hole 31 is formed from the side surface 3a to the bottom surface 3b. The axis Y of the base 3
The lead wire 5 can be inserted obliquely to -Y. Therefore, since the tip of the lead wire 5 easily projects from the opening end 30a of the opening 30, the work of inserting the lead wire 5 into the base 3 becomes easy, and as a result, the base is attached to the sealing portion of the tubular incandescent lamp. Installation becomes easier.

[0020]

According to the tube-type incandescent lamp of the present invention, the end of the lead wire and the end of the external lead rod are joined outside the base, and then the base is moved to make the sealing portion the opening of the base. The base can be easily attached to the sealing portion of the tube-type incandescent lamp without using an adhesive, and the operation can be simplified.

In a state where the base is fixed to the sealing portion of the tubular incandescent lamp, the external lead rod and the lead wire are substantially orthogonal to each other. It is derived and no load is applied to the joint between the lead wire and the external lead rod.

Further, when a tubular incandescent lamp is incorporated into an industrial heating device or the like, even if a load is applied to the base, the external lead rod projects into the space of the opening of the base. Since the structure is such that the load is not directly transmitted, no load is applied to the sealing portion of the portion where the external lead bar is buried, and the occurrence of cracks can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a tube-type incandescent lamp of the present invention.

FIG. 2 is an enlarged sectional view and a sectional view of one end of the tubular incandescent lamp shown in FIG.

FIG. 3 is an explanatory diagram of a method of attaching a sealing portion and a base of the tubular incandescent lamp of the present invention.

FIG. 4 is an enlarged sectional view of one end of another embodiment of the tubular incandescent lamp of the present invention.

FIG. 5 is an enlarged sectional view of one end of another embodiment of the tubular incandescent lamp of the present invention.

FIG. 6 is an explanatory view showing a state of a base and a lead wire of the tube-type incandescent lamp shown in FIG. 5;

FIG. 7 is an explanatory diagram of a conventional tubular incandescent lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Enclosure 11 Sealing part 2 Filament 3 Base 30 Opening 30a Open end 31 Outgoing hole 32 Notch 3a Side 3b Bottom 4 External lead rod 5 Lead wire

Claims (3)

[Claims] 1. A heat-resistant insulating base is fitted to each of sealing portions formed at both ends of a tubular incandescent seal without an adhesive, and a tube shaft of the tubular type seal is inserted from a side surface of each of these bases. A base incandescent lamp in which a lead wire is led out in a direction orthogonal to the opening, wherein the base has an opening in which the sealing portion is fitted, and a lead formed in a side surface of the base in a direction intersecting the opening. A tube-type incandescent lamp characterized by having a wire lead-out hole. 2. The incandescent lamp according to claim 1, wherein a lead wire lead-out hole of the base is formed over a bottom surface of the base. 3. A convex portion is formed on an inner surface of the base on the opening side so as to be in contact with an end surface of a sealing portion from which an external lead rod of the tubular incandescent lamp projects. Or the tubular incandescent lamp according to claim 2.