JPH0439662Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a novel filament mounting structure for an incandescent light bulb, which allows the filament to be easily and reliably attached.

(Prior art and its problems) Conventionally, when attaching the filament 4' to the lead rod 2', the lead wire 5' of the filament 4' is connected to the spiral attachment part 3' of the lead rod 2' as shown in Fig. 3. Either insert the wire and fix it by spot welding, or bend the lead wire 5' connecting the pair of filaments 4' into an inverted U shape as shown in Fig. 4, and attach the hook portion 7' of the lead wire to this bent portion 6'. It adopted a structure in which it was locked.

In the case of FIG. 3, the lead wire 5' of the filament 4', which is thin and easily bent and requires skill to handle, is inserted securely into the helical attachment part 3'.
Because spot welding had to be done, work efficiency was extremely poor, and this was the key to improving productivity.

In the case of Fig. 4, it is true that the filament 4'
The work itself is very simple as it only involves locking the bent part 6' of the filament 4', but there are problems such as the bent part 6' coming off or breaking due to external vibrations, and the filament 4' Regarding the installation work, it was desired to propose a highly reliable mounting structure that is easy to install and will not come off or break.

(Purpose of the invention) The present invention was made in view of the drawbacks of the conventional example, and its purpose is to clamp the lead wire of the filament between the spiral attachment parts and weld it at the clamped part. By adopting a unique structure, installation is easy and contributes to improved productivity.
Moreover, it is an object of the present invention to provide a filament mounting structure for an incandescent light bulb whose mounting state is reliable.

(Means for Solving the Problems) In order to achieve the above object, the present invention is as follows: A lead rod 2 for attaching a filament arranged in a glass tube 1 is wound in a spiral shape to form a helical attachment part 3. Then, the lead wire 5 of the filament 4 is sandwiched between the helical attachment parts 3 and welded to the helical attachment part 3 that can sandwich the lead wire 5.

; is adopted as a technical means.

(Function) The lead wire 5 of the filament 4 is sandwiched between the spiral attachment portion 3 and the lead wire 5 is temporarily fixed.

Next, the helical attachment portion 3 of the filament 4 is welded to the lead wire 5, and the helical attachment portion 3 is welded to the helical attachment portion 3 which can hold the lead wire 5 therebetween.

As a result, the lead wire 5 is welded to the spiral attachment portion 3 at two locations, which not only increases the welding strength but also provides extremely high reliability against external vibrations.

(Example) The present invention will be described below with reference to illustrated embodiments.

FIG. 1 is a sectional view of an embodiment of an incandescent light bulb A according to the present invention. A filament 4 (two filaments in this embodiment) is disposed within the glass tube 1, and lead wires 5 are led out from both ends of the filament 4. The lower end of the glass tube 1 is crushed to form a flat pinch seal portion 8, and a molybdenum metal foil 9 is embedded within the pinch seal portion 8. This molybdenum metal foil 9 has an internal lead rod 2a.
One end of the tube is welded and introduced into the glass tube 1, and a quartz piece 1 is clamped in place near the base of the introduction portion. The introduction side end portion of the internal lead rod 2a is spirally wound, and this portion is the spiral attachment portion 3. In this embodiment, as shown in FIG. 2, in order to hold the lead wire 5 of the filament 4 between the helical attachment parts 3, the central axis of the helical attachment part 3 is oriented somewhat perpendicular to the tube axis of the glass tube 1. It is arranged to face. A suspension lead rod 2b extending to the head of the glass tube 1 is erected from the quartz piece 10, and the vicinity of its tip is spirally wound to form a spiral attachment portion 3. Holding lead rod 2
The tip of the lead rod 2b is inserted into the tip tube of the head of the glass tube 1 to center the tip of the suspension lead rod 2b. Further, a support 11 is provided upright from the quartz piece 10 as required, and the tip of the support 11 is wound around the center portion of the filament 4 to support the filament 4. Lead wire 5 of filament 4 and lead rod 2
The details of the fixing structure are shown in Figure 2. That is, the lead wire 5 of the filament 4 is sandwiched at an appropriate position of the wound spiral attachment part 3, and the lead wire 5 and the spiral attachment part 3 are spot welded to form a spiral lead rod in contact with the lead wire 5. 2. In this way, both lead wires 5 of the filament 4 are stretched between the internal lead rod 2a and the helical attachment portion 3 of the suspension lead rod 2b.
In addition, the molybdenum metal foil 9 has an external lead rod position 2.
It is also welded and led out of the pinch seal portion 8. This external lead rod 12 faces the pinch seal portion 8 and is welded to a base (not shown) or a terminal (not shown) of an insulator (not shown) fixed with adhesive.

The incandescent light bulb A is then screwed into a socket (not shown) and energized to light up, but both filaments 4 are short-circuited by the suspension lead rod 2b and light up in the same way. Furthermore, since the lead wire 5 of the filament 4 is welded to the spiral attachment portion 3 at two locations, not only is the welding strength high, but it is also highly reliable against external vibrations.

(Effects of the present invention) As described above, the present invention involves spirally winding the lead rod for attaching the filament disposed inside the glass tube to form a helical attachment part, and connecting the lead wire of the filament to the helical attachment part. Since the lead wire is welded to a lead rod that can be inserted between the screws and the lead wire, the lead wire can be temporarily fixed by simply inserting the filament lead wire into the helical mounting part, eliminating the need for the conventional insertion method. It is much easier to work with, and since the lead wire is welded to the helical mounting part at two locations, it not only has high welding strength but also has the advantage of being extremely reliable against external vibrations. be.

[Brief explanation of the drawing]

Fig. 1: A sectional view of one embodiment of the present invention, Fig. 2: A detailed sectional view of the attached state of the lead wire and spiral attachment portion in the present invention, Fig. 3: A portion of the attached state of the conventional example. Cross-sectional view, Fig. 4... Partial sectional view of the installation state of other conventional examples, A... Incandescent light bulb, 1... Glass tube, 2... Lead rod, 2a... Internal lead rod, 2b... Hanging support. lead rod, 3... spiral attachment part, 4... filament, 5... lead wire, 6'... bent part, 7'...
Hook part, 8... Pinch seal part, 9... Molybdenum metal foil, 10... Quartz piece, 11... Support, 12... External lead rod.

Claims (1)

[Scope of utility model registration request] A lead rod for attaching the filament placed inside the glass tube is wound spirally to form a helical attachment part.
A filament mounting structure for an incandescent light bulb, characterized in that a lead wire of the filament is sandwiched between a spiral mounting part and welded to a spiral mounting part that can hold the lead wire.