JPH0733368Y2 - Micro light bulb - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a microminiature light bulb used as an indicator light, a light source for an illuminated switch, or the like.

[Conventional technology]

For example, as shown in FIG. 4, a bulb 41 having a filament enclosed in an elongated glass bulb is covered with a color cap 42, and the vicinity of the sealing portion is inserted into a plastic base 43, or as shown in FIG. After inserting the vicinity of the sealing portion of 51 into the plastic base 53, the color cap 52 is covered so as to cover most of the base 53, and at the time of use, as shown in FIG. The lead wire 44 (or 54) is electrically and mechanically connected by soldering C.

[Problems to be solved by the device]

However, in such a structure, since the color cap 42 is covered up to the periphery of the sealing portion and these are inserted into the base 43, or the base 53 is also covered with the color cap 52, the outer diameter becomes large. Moreover, since the sealing portion is limited to the inner diameter of the glass bulb even if the outer diameter becomes large, the lead wire 44 (54) is limited to a thin wire, which makes automation of the process difficult.

The purpose of the present invention is to allow the use of thick lead wires,
As a result, it is an object of the present invention to provide a microminiature bulb that can be automated in assembly.

[Means for Solving the Problems]

According to the present invention, a glass ball having an inner diameter of a sealing portion located below a small diameter portion, which is a filament insertion portion, is larger than the small diameter portion, and an introducing wire and a lead wire having a large diameter are connected in a bead stem. It comprises a bead mount in which a filament is connected to the introduction wire, the filament of the bead mount is arranged in the small diameter portion of the glass sphere, the bead stem is fused at the sealing portion, the small diameter The outer surface of the part is covered with a color cap, and the use of thick lead wires facilitates automation in the assembly process.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, in which 11 is a glass ball having a sealing part (bead insertion part) having an inner diameter larger than that of a filament insertion part, 12 is a filament, and 13 is a large diameter part of the glass ball 11. Bead stem fused and fused to, 14 is a lead wire for supporting the filament 12 on the stem 13 and making an electrical connection, 15 is the lead wire 14 and the stem
A lead wire having a large wire diameter connected inside 13 and a color cap 16 covered on the outer surface of the small diameter portion of the glass ball 11.

The light bulb having the above structure is manufactured by the manufacturing process shown in FIG. That is, the tip has a hemispherical shell shape and has a small-diameter portion that serves as a filament insertion portion, and a sealing portion that is a large-diameter portion that has a larger inner diameter than the small-diameter portion is continuous with the opening end that is the lower portion of the small-diameter portion. A glass tube 21 having a tubular body is prepared. Further, a bead mount M in which the lead wire 14 and the lead wire 15 are connected in the lead stem 13 and the filament 12 is connected to the tip of the lead wire 14 is prepared. Then, the bead mount M is inserted into the glass tube 21 to dispose the filament 12 in the small diameter portion, and the lead stem 13 is fitted into the sealing portion, fused and integrated, and after exhaust gas filling. After sealing, the excess glass tube is removed to obtain a light bulb body in which the filament 12 is positioned inside the glass bulb 11. After that, by covering the outer surface of the small-diameter portion of the glass bulb 11 with the color cap 16, a microminiature electric bulb (FIG. 1) is completed.

The above-mentioned ultra-compact light bulb is, for example, as shown in FIG.
Is mounted on a printed wiring board 20, and its lead wire 15 is soldered to be electrically and mechanically connected.

As described above, the deformed glass tube 21 having the small diameter portion (filament insertion portion) and the large diameter portion (sealing portion) continuous with the thin diameter portion is used, and the bead stem 13 is fitted to the sealing portion which is the large diameter portion and melted. When attached, the sealing portion becomes large and the thick lead wire 15 can be used, and automation in the assembly process is facilitated. In addition, the external size can be reduced.

[Effect of device]

As described above, according to the present invention, a glass sphere having an inner diameter of a sealing portion located below a small diameter portion, which is a filament insertion portion, is larger than the small diameter portion, and a lead wire having a large lead wire and a large wire diameter in a bead stem. A bead mount in which a wire is connected and a filament is connected to the lead-in wire, and the filament of the bead mount is arranged in the small-diameter portion of the glass bulb, and the bead stem is melted in the sealing portion. Since the outer surface of the small diameter portion is covered with the color cap, it is possible to increase the size of the sealing portion and use a thick lead wire, which facilitates automation in the assembly process. In addition, the outer shape can be made smaller and the cost can be reduced. Further, there is an advantage that the stepped portion of the glass bulb is effective for positioning the mount, and high accuracy can be expected.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a microminiature light bulb according to the present invention, FIG. 2 is a manufacturing process explanatory view of the same embodiment, and FIG. 3 is a cross-sectional view showing a usage example of the light bulb of the same embodiment. 4 and 5 are sectional views showing a conventional example, and FIG. 6 is a side view showing a conventional use state. 11 …… Glass sphere, 12 …… Filament, 13 …… Bead stem, 14 …… Introduction wire, 15 …… Lead wire, 16 …… Color cap, M …… Bead mount.

Claims (1)

[Scope of utility model registration request] 1. A glass ball having an inner diameter larger than the small diameter portion of a sealing portion located below a small diameter portion serving as a filament insertion portion is connected to a lead wire having a large wire diameter in a bead stem. And a bead mount in which a filament is connected to the lead-in wire, the filament of the bead mount is arranged in a small diameter portion of the glass bulb, and the bead stem is fused at the sealing portion. An ultra-compact light bulb whose outer surface is covered with a color cap.