JPH0467745B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an incandescent light bulb, which includes a sealing process on one side and an exhaust sealing process on the other side.

(Prior Art) There are the following methods for sealing a halogen light bulb with one side sealed and the other side exhausted.

() As shown in Fig. 3, the exhaust pipe 2 is welded to one end (the upper end in the figure) of the glass tube 1 for the bulb, and the mount 4 is attached to the glass tube while holding the exhaust pipe 2 or the upper part of the glass tube 1 with the holder 3. 1, heat the lower part of the glass tube 1 with a burner to soften it, and press it with a mold to seal it. In this case, the lower part of the mount 4 is held by the holder 5.

() The method is substantially the same as the method in () above, but the upper end of the mount 4 is placed inside the exhaust pipe 2 as shown in FIG.

() As shown in FIG. 5, hold the bulb glass tube 1 with the holder 6 and squeeze a part of it, insert the mount 4 into the glass tube 1 from below, and seal it in the same manner as in (). In this case as well, the lower part of the mount 4 is held by the holder 5.

(Problem to be solved by the invention) However, in either case, only the lower part of the mount 4 is held, so there is a risk that the mount will be pushed due to the flow of the glass during sealing and the filament will be misaligned. There is. Further, since the mount 4 is deformed, stress is applied to the filament, causing deformation, etc., and variations in its characteristics such as luminous flux, current, life, etc. increase.

(Means for Solving the Problems) When manufacturing an incandescent light bulb that is sealed on one side and exhausted on the other, the present invention provides for a mount to be placed in a glass bulb tube, and the filament of the mount or its vicinity held by a mount holder. The mount holder is inserted from the end side of the glass tube that is to be sealed in a supported state, and the mount holder is positioned on the end side of the glass tube that is the exhaust side, and the mount holder is positioned on the end side of the glass tube that is the side that is to be sealed. After sealing, the mount holder is removed, the portion of the glass tube that corresponds to the upper part of the filament is drawn and evacuated, and gas is filled in from the drawn portion to tip-off. It is characterized by:

(Embodiment) FIGS. 1A to 2D and FIG. 2 show an embodiment of the present invention, in which a mount 11 is made in the mounting process shown in FIG. 1A, and as shown in FIG. The filament 11A or the internal lead 11B in its vicinity is held or supported by the mount holder 12 and inserted into the bulb glass tube 13 from the end side to be sealed (sealing step). Then, as shown in Figure 2, glass tube 1
3 is held in a bulb holder 14, and in this state, the lower part of the glass tube 13 is heated with a burner 15 to soften it, and is sealed by pressing with a mold (see FIG. 1C).
After this, the mount holder 12 is removed, and the intermediate portion of the glass tube 13 corresponding to the upper part of the filament is heated and squeezed (drawing step). Next, the gas is evacuated, halogen gas is filled in, and the constricted portion is tipped off as shown in FIG. 1D (evacuation/filling process).

Note that although the lower part of the mount 11 is not held in the illustrated example, it may be held with a holder.

(Effects of the Invention) (1) Since the filament or its vicinity is sealed while being held or supported by the mount holder, there is almost no movement of the mount, and the filament position can be maintained with high precision.

(2) Deformation and pitch clogging of the filament are reduced, and luminous flux, lifespan, power, etc. are stabilized.
Moreover, the optical characteristics are also stabilized.

(3) In halogen light bulbs, changes in the temperature of each part of the bulb greatly affect the life of the bulb, but due to the increased positioning accuracy of the filament, there is almost no difference in the temperature of each part of the bulb from bulb to bulb, and the amount of halogen can be reduced to the necessary minimum. can be limited. This results in a longer lifespan for the same brightness.

(4) When focusing with a cap attached in a later process, the filament's positional accuracy is high, making it easy to focus. Moreover, the variation in the shape of the product is reduced, and the yield is improved.

[Brief explanation of drawings]

Figures 1A, B, C, and D are process explanatory diagrams showing one embodiment of the method for manufacturing an incandescent light bulb according to the present invention, and Figure 2 is a perspective view illustrating the sealing process and squeezing process in the same embodiment. , FIGS. 3 to 5 are perspective views for explaining the conventional sealing process. 11...Mount, 11A...Filament,
11B...Internal lead, 12...Mount holder, 13...Glass tube for bulb, 14...Bulb holder, 15...Burner.

Claims (1)

[Scope of Claims] 1. When manufacturing an incandescent light bulb with a seal on one side and exhaust on the other, a mount is placed inside a glass tube for a bulb, and the filament of the mount or its vicinity is held or supported by a mount holder. the mount holder is positioned on the end side of the glass tube that is the exhaust side, and the end side of the glass tube that is the side that is to be sealed is heated. After the sealing, the mount holder is removed, a portion of the glass tube corresponding to the upper portion of the filament is drawn and exhausted, and gas is filled in from the drawn portion side for tip-off. How to make light bulbs.