JPS5847829B2 - tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tube such as a tube-shaped incandescent light bulb for an electronic copying machine.

In conventional tubes, the coil filament and the metal wire supporting it, such as the internal lead-in wire, are connected by stretching the end of the filament and caulking it to the tip of the metal wire, or by attaching it to the tip of the metal wire. This was done by fixing the stretched end of the filament to the notch via a winding wire.

Therefore, in the past, there were disadvantages in that a lot of time and effort was required for the connection work, and there were many cases where the connection could not be performed reliably.

The object of the present invention is to provide a light bulb capable of eliminating the above-mentioned drawbacks, and an example in which the present invention is applied to a tube-shaped incandescent light bulb for a copying machine will be described below with reference to the drawings. .

Reference numeral 1 in FIGS. 1 and 2 is a cylindrical bulb made of quartz glass or the like, and both ends of the bulb are pinch-sealed.

A foil 2 made of molybdenum or the like is embedded in this pinch-sealed crushing sealing portion, and one ends of an external lead-in wire 3 and an internal lead-in wire 4 are connected to this foil 2.

Between the other ends of the internal lead-in wires 4 and 4 inserted into the bulb 1 are a plurality of coil filaments 5 that form a light emitting part.
. . . and a plurality of non-luminous sticks 6 that mark the non-luminous parts.
and are alternately connected along the tube axis direction.

The internal lead-in wires 4, 4 and the non-luminous rods 6 are made of metal wires, such as tungsten wires having a circular cross section, and the connections between these and each coil filament 5 are as shown in FIG. It's like this.

That is, the tip of the internal lead-in wire 4 and the end of the non-luminous rod 6 are bent into a substantially hairpin shape, for example, as shown in FIG. 3, and this bent part 7 is inserted into the end of the coil filament 5. The bent ends 7a of the coil filaments 5 are connected by being locked between the filament pitches of the coil filaments 5.

Here, the angle θ formed by the axis of the metal wire and the bent end 7a is less than 900, which facilitates insertion and locking into the coil filament 5.

Note that the internal lead-in wire 4 and the bent portion 7 of the non-luminous rod 6 do not necessarily have to be in the shape of a hairpin; for example, as shown in FIG.
It may be bent so as to intersect with the metal wire as shown in FIG. The shape may be formed by first bending it into a ring shape, and then bending the tip in an oblique direction.The key point is that the angle θ between the axis of the bent end 7a and the axis of the metal wire is 9 as described above.
Any bent shape is acceptable as long as it is less than 00.

Further, one end of a ring-shaped anchor 8 is wound around the connection portion between the coil filament 5 and the non-luminous rod 6, that is, the portion where the bent portion 7 of the non-luminous rod 6 is inserted and locked. These anchors 8 are used to support the coil filaments 5 and the like at the axial center of the bulb 1.

Incidentally, it goes without saying that the anchors 8 may be provided in a portion other than the above-mentioned arrangement portion.

According to this embodiment, in order to connect the internal lead-in wire 4 or the non-luminous rod 6 . . . and the coil filament 5 . This can be done by simply inserting the bent portion 7 of the rod 6.

During this insertion, the bent portion 7 is pushed in while being somewhat elastically deformed, and since it has a bent end 7a, it can be inserted very easily by simply pushing it in, and after being pushed in, the bent end 7a Since the tip is locked between the filament pitches of the coil filament 5, the bent portion 7 will not come off from the coil filament 5.

Moreover, in this embodiment, since the anchors 8 are disposed at the connection portions between the coil filament 5 and the non-light emitting rod 6, these connections can be made even more reliable.

The tube-type incandescent light bulb for copying machines of this embodiment is significantly superior to conventional ones.

In other words, in the conventional non-light-emitting part, a metal rod having an outer diameter that is almost the same as the inner diameter of the long coil filament is inserted into the long coil filament to prevent the coil filament from breaking or deforming during the insertion process. In addition, it is necessary to wrap the winding wire around the cut arrow part provided on the metal rod during caulking to prevent the metal rod from moving, and this work reduces the strength of the metal rod. It has drawbacks such as significant deterioration.

However, according to the tubular incandescent lamp of this embodiment, the above-mentioned drawbacks can be eliminated by inserting and locking the bent portion 7 as described above.

Furthermore, in the conventional method, the metal rod inserted into the coil filament has an outer diameter that is almost the same as the inner diameter of the coil filament, and the part of the filament that faces the metal rod is not used as a light emitting part and is a wasted part. As a result, the wires are quite heavy, and therefore lack resistance to wire breakage due to the slightest shock during transportation.

However, according to the tubular incandescent lamp of this embodiment, the non-luminous rod 6 can be connected to the coil filament 5 through its bent portion 7 even if the diameter is considerably smaller than the inner diameter of the coil filament 5, and the non-luminous rod 6 can be connected to the coil filament 5 through its bent portion 7. Since this does not require unnecessary coil filaments, the weight can be reduced and the vibration resistance can be improved.

Furthermore, the present invention is not limited to being implemented only in the tube-shaped incandescent light bulb for copying machines, but can be implemented not only in incandescent light bulbs for studio lighting but also in tubes such as discharge lamps.

Further, in the above embodiment, the metal wire of the non-luminous rod, etc., had a circular cross section, but it may also have a rectangular cross section, and in this case, there would be two locking parts for the coil filament. This has the advantage of making the connection stronger.

As explained above, this invention inserts and locks the bent end of the metal wire into the end of the coil filament, and
The bent end has a tubular shape, and is characterized in that the angle between the axis of the bent end and the axis of the metal wire is less than 90'.

Therefore, the present invention has the effect of making it possible to perform the connection work between the coil filament and the metal wire extremely easily and reliably, and particularly when applied to a tube-shaped incandescent light bulb for a copying machine, it has a significant effect. That's what you get.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a tubular incandescent light bulb for an electronic copying machine according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is a side view of the bent part, and Fig. 4 a. , b, and c are side views showing modified examples of the bent portion. 4...Metal wire (internal lead-in wire), 5...
Coil filament, 6...metal wire (non-luminous rod), 7...bent portion, 7a...bent end.

Claims (1)

[Claims] 1 Insert and lock the bent end of the metal wire into the end of the coil filament, and the bent end forms an angle of 90° between the axis of the bent end and the axis of the metal wire.
A tube characterized by being less than or equal to.