JPH055635Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is a light bulb that has a pinch seal part with metal foil embedded inside and a lead rod welded to the metal foil, such as a halogen light bulb or metal halide lamp. This invention relates to a new light bulb assembly structure.

(Conventional technology and its problems) In conventional light bulbs, the lead rod welded to the metal foil is simply a straight line, and when performing pinch sealing, the lead rod is pinched and then the end of the glass tube is The method used was to heat the metal to red heat and use a pincher to pinch and crimp the metal foil. However, if the lead rod is held in a good condition and the pressing surface of the pincher is parallel to the plane of the metal foil, the metal foil will not be twisted during pinch sealing and will be held accurately, causing foil breakage. On the other hand, if the lead rod is poorly held and the pressing surface of the pincher and the plane of the metal foil are not parallel, the metal foil will be twisted along the pincher during pinch sealing and the welded part of the lead rod will be damaged. There was a problem with the foil breaking.

(Purpose of the invention) The present invention was made in view of the drawbacks of the conventional example, and its purpose is to ensure that the pinching state of the lead rod is such that the pressing surface of the pincher and the plane of the metal foil are always parallel. The purpose of the present invention is to provide a new light bulb assembly structure.

(Means for solving the problem) To achieve the above purpose; Pinch seal part E with metal foil B embedded inside
In a light bulb A having a lead rod C welded to a metal foil B, a part of the lead-out portion of the lead rod C is bent in a plane that is substantially the same as or substantially parallel to the metal foil B,
This curved portion D is used as a pinching portion during pinch sealing.

; is adopted as a technical means.

(Function) In the pinch sealing operation, the glass tube F is placed between the pinchers 9, the bent portion D of the lead rod C is held between the pinchers 9, and the electrode 10 is placed between the pinchers 9.
is placed inside the glass tube F.

Then, since the curved portion D and the metal foil B are on substantially the same plane or in a substantially parallel plane, the pressing surface 9a of the pincher 9 and the plane of the metal foil B automatically become parallel.

In this state, when the end of the glass tube F of the light bulb A is heated red-hot and then pinch-sealed, the metal foil B is precisely aligned without being twisted by the pressing surface 9a of the pincher 9, and a pinch-sealed portion E is formed. It will happen.

(Embodiments) The present invention will be described below with reference to illustrated embodiments.
A light bulb A to which the present invention is applied is, for example, a halogen light bulb or a metal halide lamp, which has a pinch seal portion E in which a metal foil B is embedded and a lead rod C welded to the metal foil B. In the illustrated embodiment, a metal halide lamp is used as an example, but of course the lamp is not limited to this. The metal halide lamp is composed of an inner bulb 4 serving as a light source and an outer bulb 5 including the inner bulb 4. The central portion 6 of the inner valve 4 is formed into a spherical shape, and a tip tube 7 is connected thereto. This spherical central part 6
A pinch seal portion E is formed at both ends of the
A molybdenum metal foil B is sandwiched and buried within the pinch seal portion E. A pair of electrode rods 8 introduced into the spherical central portion 6 are respectively welded to the inner end portions of the molybdenum metal foil B, and are opposed to each other with a predetermined interval. On the other hand, an internal lead rod 2 is welded to the outer end of the molybdenum metal foil B, and is led out from the pinch seal portion E. This internal lead rod 2 is formed with a bent portion D that is bent into a dogleg shape in the figure, and this bent portion D is located in a plane that is substantially the same or substantially parallel to the molybdenum metal foil B. It's becoming like that. This inner valve 4 is disposed within the aforementioned outer valve 5, and the other end of the inner lead rod 2 is welded to the other end inside the molybdenum metal foil B embedded in the pinch seal portion E of the outer valve 5. There is.
Similarly, an external lead rod 3 is welded to the outer end of the molybdenum metal foil B in the pinch seal portion E of the outer valve 5 and is led out.
A dogleg-shaped bent portion D is formed in a plane that is substantially the same as or substantially parallel to the molybdenum metal foil B. Here, the shape of the curved portion D is not limited to a dogleg shape, but may be any shape that can form a plane, such as a U-shape, a semicircular shape, or an S-shape. I don't mind.

In the case of a light bulb A with a double tube structure as shown in the figure, the electrode rod 8, the molybdenum metal foil B for the inner bulb 4, the inner lead rod 2, the molybdenum metal foil B for the outer bulb 5, and the outer lead rod 3 are used. They are integrally welded in advance, and the curved portions D of the molybdenum metal foil B, the inner lead rod 2, and the outer lead rod 3 are formed so as to be located in substantially the same plane or substantially parallel planes.

Then, the bent part D of the internal lead rod 2 is held by the holding part 1 of the pincher 9, and the inner valve 4 is
After inserting the electrode rod 8 into the glass tube F for use, the end of the glass tube F is made red hot in an inert atmosphere, and when a predetermined temperature is reached, the pincher 9 is activated to flatten the red hot part. Crush it to form a pinch seal part E. At this time, since the bent portion D is held, the molybdenum metal foil B and the pressing surface 9a of the pincher 9 become almost parallel, and are held together without being twisted. The pinch seal portion E may be formed on both sides at the same time, or may be formed on one side at a time. When the pinch sealing is completed, a predetermined gas is sealed in the spherical central portion 6, and then the tip tube 7 is sealed off. When the formation of the inner valve 4 is completed, the bent part D of the outer lead rod 3 is held, the inner valve 4 is placed inside the outer valve 5, and after the end of the outer valve 5 is heated to red heat as described above, a pinch seal is performed. Then, a molybdenum metal foil B is embedded in the pinch seal portion E, and after the outer valve 5 is brought into a substantially vacuum state, the tip tube 7 is sealed off.

It goes without saying that the above structure can also be applied to the manufacture of single tube type halogen light bulbs.

(Effects of the present invention) As described above, the present invention provides a light bulb that has a pinch seal part with metal foil embedded inside and a lead rod welded to the metal foil. A part of the lead-out part of the lead rod is curved in a plane, and this curved part is used as a pinching part during pinch sealing, so the pressing surface of the pincher and the plane of the metal foil are almost parallel, and pinch sealing is achieved. The lead rod is not twisted along the pincher, and the welded portion between the lead rod and the metal foil is not torn due to twisting.

[Brief explanation of the drawing]

FIG. 1: A front sectional view of an embodiment of the present invention; FIG. 2: A perspective view of the appearance of the present invention during pinch sealing. A...Light bulb, B...Metal foil, C...Lead rod,
D...Bending part, E...Pinch seal part, F...Glass tube, 1...Closing part, 2...Internal lead rod, 3
...External lead rod, 4...Inner valve, 5...
...Outer bulb, 6...Central part, 7...Tip tube, 8...Electrode rod, 9...Pincher, 9a...
Pressing surface, 10...electrode.

Claims (1)

[Scope of utility model registration request] In a light bulb that has a pinch seal part with metal foil embedded inside and a lead rod welded to the metal foil,
A light bulb assembly structure characterized in that a part of the lead-out part of the lead rod is bent in a plane substantially coplanar or substantially parallel to the metal foil, and the bent part serves as a clamping part during pinch sealing.