JPH03216947A - Tubular incandescent lamp - Google Patents

Abstract

PURPOSE:To surely support a filament coil on the axis of a bulb by constituting a ring anchor with a ring section integrally extended in the radial direction from one end of a winding section wound on the filament coil in contact with the inner face of the bulb and an extension section extended in the radial direction from the other end of the winding section in contact with the inner face of the bulb. CONSTITUTION:A ring anchor 4 supporting a mount 2 has a winding section wound on the mount 2, a ring section 9 extended in the radial direction from one end of the winding section 8 in contact with the inner face of a bulb 1, and an extension section 10 extended in the radial direction from the other end of the winding section 8 in contact with the inner face of the bulb 1. Since both the ring section 9 provided at one end of the winding section 8 of the ring anchor 4 and the extension section 10 provided at the other end of the winding section 8 are kept in contact with the inner face of the bulb 1, the occurrence of inclination is reduced. A filament coil 3 can be surely held on the center axis of the bulb 1 even if vibrations and shocks are applied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a tubular incandescent light bulb such as an infrared light bulb or a tubular halogen bulb used as a light source for a copying machine.

(Prior art) Infrared light bulbs used as light sources in heating equipment and tube-shaped halogen light bulbs used as light sources for document illumination in copying machines are installed inside straight tube-shaped bulbs along the tube axis. A mount containing a filament coil is provided.

The mount for an infrared light bulb consists of a straight quartz bulb with a single long filament coil made of tungsten placed along the tube axis, and a tube-shaped halogen bulb used as a light source for copying machines. The mount in is used to equalize the illuminance distribution along the tube axis.
Light-emitting parts made of filament coils and non-light-emitting parts made of short-circuit wires are arranged alternately.

In order to hold the filament coil on the axis of the bulb, these mounts are supported by a plurality of ring anchors made of tungsten arranged at intervals along the tube axis direction.

A conventional ring anchor in such a mounting structure consists of a coil-shaped winding part that is wound around a filament coil, and a ring part that extends from one end of this winding part in a spiral shape and contacts the inner surface of the bulb. had been formed.

(Issues to be Solved by the Inventionffi) However, in the case of the conventional structure described above, since the ring anchor has a structure in which only the circumferential surface of the ring portion contacts the inner surface of the valve, there is a problem that the ring anchor tends to tilt.

In other words, even though the ring part contacts the inner surface of the valve, it is necessary to allow passage when inserting the mount into the valve, so the outer diameter of the ring part is formed to be slightly smaller than the inner diameter of the valve. There is a slight clearance between the outer peripheral surface of these ring parts and the inner surface of the valve.

Therefore, rattling is likely to occur between the two, and when an impact is applied, the ring anchor tends to tilt, causing the filament coil to deviate from the axis of the bulb, resulting in a problem that the heat distribution and light distribution characteristics are disturbed.

To prevent this, measures have been taken to increase the wire diameter of the tungsten wire that makes up the ring anchor, but this makes it difficult to form and increases the material cost, and also increases the heat capacity of the ring anchor, causing heat loss. There are disadvantages such as increased size.

The present invention aims to provide a tubular incandescent light bulb that can prevent the ring anchor from tilting and can reliably support the filament coil on the axis of the bulb.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a ring anchor that supports a mount, and includes a winding part that is wound around the mount, and a ring anchor that extends radially from one end of the winding part and extends around the valve. It is characterized by comprising a ring portion that contacts the inner surface of the valve, and an extension portion that extends in the radial direction from the other end of the winding portion and contacts the inner surface of the bulb.

(Function) According to the present invention, in the ring anchor, since both the ring portion provided at one end of the winding portion and the extension portion provided at the other end of this winding portion contact the inner surface of the valve, the occurrence of inclination is reduced. , the mount can be reliably supported on the axis of the valve.

(Example) The present invention will be described below based on an example applied to an infrared light bulb shown in the drawings.

In the figure, 1 is a straight tube-shaped bulb made of transparent quartz glass, and a mount 2 is housed inside.

The mount 2 includes a filament coil 3 made of tungsten, and a plurality of ring anchors made of tungsten, molybdenum, etc. arranged at intervals in the tube axis direction and supporting the filament coil 3 so as to be positioned on the tube axis. It is composed of 4...

Both ends of the filament coil 3 are connected to metal foil conductors 6, 6 made of molybdenum or the like sealed to crush sealing parts 5, 5 formed at both ends of the bulb 1. , 6 are connected to external lead wires 7, 7.

Each of the upper ring anchors 4 has a winding part 8 wound around the filament coil 3, a ring part 9 extending radially from one end of this winding part 8 and contacting the inner surface of the bulb 1, and the above-mentioned ring anchor 4. It is formed with an extension part 10 that extends in the radial direction from the other end of the winding part 8 and comes into contact with the inner surface of the bulb 1.

The winding portion 8 is arranged around the outer circumference of the filament coil 3 by 2 to 3 windings.
The filament coil 3 is wound to the same extent as a coil, and this winding portion 8 is fastened to the filament coil 3.

Therefore, the ring portion 8 that extends integrally from one end of the winding portion 8 and the extension portion 10 that extends integrally from the other end are spaced apart in the axial direction.

A plurality of ring anchors 4 having such a structure are arranged at intervals along the axial direction of the filament coil 3, thereby holding the filament coil 3 on the central axis of the bulb 1.

In this case, it is desirable that the extensions 10 of each ring anchor 4 are not aligned in the same radial direction, that is, the directions (angles) toward the radial direction of the respective extensions 10 are slightly different from each other.

According to an embodiment of such a configuration, each ring anchor 4
In this case, the ring part 9 extending from one end of the winding part 8 is connected to the valve 1.
An extension part 1 that touches the inner part of the body and extends from the other end.
0 is also in contact with the interior of the valve 1, and since these ring portions and the extension portion 1o are spaced apart from each other in the axis h direction, the inclination of the ring anchor 4 is reduced.

However, since the extension part 10 of the ring anchor 4 only extends linearly in the radial direction, there is a risk that the ring anchor 4 will tilt in the direction without the extension part 10. By arranging them so that they are not aligned in the same direction, they complement each other in the directions of preventing inclination.

Therefore, even if vibrations or shocks are applied, the inclination of each ring anchor 4 is reduced, and the filament coil '3 can be reliably held on the central axis of the bulb 1.

Therefore, the radial heat distribution characteristics are not disturbed, and there is no need to increase the wire diameter of the ring anchor 4, so problems such as an increase in heat loss due to an increase in the heat capacity of the ring anchor 4 are prevented. 11゛, you can.

In the above embodiment, a long filament coil 3 is housed on the axis of the bulb 1, and the present invention is applied to an infrared light bulb used for a heater, etc., but the present invention is not limited to this, and can be applied to a copying machine. It may also be a tube-shaped halogen bulb used in light whales, etc., and as is well known, such a tube-shaped halogen bulb has a light-emitting part made of a filament coil and a non-light-emitting part made of a short-circuit wire etc. of the bulb. Since the ring anchors are arranged alternately along the axis and the ends of the non-light emitting parts are supported by the ring anchor, the present invention may be applied to the structure of this ring anchor.

[Effects of the Invention] As explained above, according to the present invention, in the ring anchor, the ring portion extending from one end of the winding portion contacts the inner surface of the valve, and the extension portion extending from the other end also contacts the inside of the valve. Moreover, since the ring portion and the extension portion are spaced apart from each other in the axial direction, the ring anchor is less likely to tilt. Therefore, even if vibrations or shocks are applied, the filament coil can be reliably held on the central axis of the bulb. Therefore, the radial heat distribution and light distribution characteristics are not disturbed, and there is no need to increase the wire diameter of the ring anchor, so the heat capacity of the ring anchor can be reduced and an increase in heat loss can be prevented. be able to.

4. Explanation of the drawings The drawings show one embodiment of the present invention, in which Fig. 1 is a cross-sectional view of an infrared light bulb, Fig. 2 is a side view showing the connection structure of the shorting wire, ring unloading force, and filament coil, and Fig. 3. is a perspective view of a filament coil.

1... Valve, 2... Mount, 3... Filament coil, 4... Ring anchor, 8... Winding part, 9... Ring part, 10... Extension part.

Claims (1)

[Claims] A tubular incandescent light bulb in which a filament coil is arranged along the tube axis within a straight tube bulb, and the filament coil is supported by ring anchors arranged at intervals in the tube axis direction. The ring anchor has a ring part that integrally extends in the radial direction from one end of the winding part wound around the filament coil and contacts the inner surface of the bulb, and a ring part that extends in the radial direction from the other end of the winding part and contacts the inner surface of the bulb. A tube-shaped incandescent light bulb characterized by having an extension that contacts the inner surface of the lamp.