JPH041630Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a small light bulb with a double tube wall structure in which a cylindrical glass cutting tube for setting the filament position is housed inside the exterior glass bulb.

This type of small light bulb used for optical purposes or as a light sensor requires special care in setting the light source position, that is, the position of the filament with respect to the glass bulb. If the light source is shifted to the set position, it will not focus and cannot be used for optical purposes or as a light sensor.
In order to achieve this focus, it is necessary to make adjustments within the equipment, but it is impossible to adjust each individual item within the equipment, and in the end, bulbs with misaligned light sources were treated as defective products. . In addition, this misalignment of the light source position is unavoidable due to the fact that when sealing the glass beads for sealing and the glass bulb, the glass bulb wraps around the glass beads, which pushes out the light source position, which is unavoidable in manufacturing. The difficulty is that
Good products and defective products are sorted out based on the magnitude of this positional shift.

This invention prevents misalignment of the filament when sealing the glass bulb and the glass beads for sealing by installing a glass cutting tube for positioning and glass beads for positioning inside the glass bulb. This provides a compact light bulb with accurate light source position.

The double tube wall structure compact light bulb of the present invention will be explained with reference to the accompanying drawings. FIG. 1 shows a sectional view of the compact light bulb of the present invention, and FIG. 2 shows a detailed view showing its assembly. FIG. 3 shows a sectional view of another embodiment of a small lens-type light bulb.

In FIGS. 1 and 2, 1 is the tip head 7
It is an exterior glass bulb shaped into a semicircular shape and takes the form of a normal light bulb. 2 is a glass bead for sealing, 4 is a glass bead for positioning, and 3 is a glass cutting tube for positioning. As shown in the figure, the glass cutting tube 3 has an outer diameter that is approximately equal to the inner diameter of the exterior glass bulb 1 A glass bulb with a diameter and an exterior glass bulb with an upper end
The tip of the tip is brought into contact with the base of the semicircular shape 7, and the lower part is brought into contact with the positioning glass bead 4, and this part is made into a double tube wall structure.

The second assembly of the compact light bulb with double tube wall structure of this invention
To explain with the drawing, A shows an exterior glass bulb 1, which is formed into a semicircular shape 7 at the top end. B shows a glass cutting tube 3 for positioning, which is installed inside the exterior glass bulb 1 shown in FIG. Configure it so that it does not move upward. C is a mount A to which the filament 5 is connected, 2 is a glass bead for sealing, 4 is a glass bead for positioning, and 6, 6 are lead wires. The mount A thus formed is inserted into the exterior glass bulb 1 housed inside the cut tube 3, and the lower end of the bulb 1 and the sealing bead are fused and sealed while being evacuated.

Normally, when melt-sealing is performed in this way, the lower end 1' wraps around the beads 2, as shown in the lower end 1' of the exterior glass bulb 1 in FIG. 1, and as a result, the beads 2 move slightly. Therefore, the filament 5 also tends to be pushed out, and the light source (filament) tends to shift from the set position. However, in the present invention, the glass cutting tube 3 for positioning is connected to the base of the semicircular head 7 of the exterior glass bulb 1. Since it is fixed by the glass beads 4 for positioning, even if the glass beads 2 for sealing are wrapped by sealing, the light source (filament)
There is no movement and the position of the light source does not deviate from the set position.

The light bulb shown in FIG. 3 is a lens lamp in which a lens bulb 7' is mounted on the top end of an exterior glass bulb 1. When the positioning structure of the present invention is applied to such a lens lamp, the lens It is particularly effective for maintaining the focus of 7', and in the case of a halogen lamp filled with halogen gas, as the light source is positioned, only the filament 5, which is unique to halogen lamps, becomes hot, and the center of the filament becomes hot. The tendency for the wire to break is also due to the presence of the cut tube 3 for positioning, which increases the internal temperature of the area surrounded by the cut tube 3, making the entire filament high temperature, which reduces the halogen cycle around the filament. By activating the wire, it can prevent the filament from breaking and maintain a long life.

The compact light bulb with the double tube wall structure of the present invention has the above-mentioned glass cut tube 3 and beads 4, which prevents the position of the light source from shifting, making it possible to obtain a high-quality compact light bulb with high accuracy.It is also applicable to halogen lamps. It has a unique effect not found in conventional small light bulbs, which is that it can be maintained for a long life when it is heated.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of a compact light bulb with a double tube wall structure according to the present invention, FIGS. 1...Exterior glass bulb, 2...Glass beads for sealing, 3...Glass cutting tube for positioning, 4...Glass beads for positioning, 5...Hilament.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical glass cutting tube 3 having an outer diameter equal to the inner diameter of the glass bulb 1 is placed inside an exterior glass bulb 1 whose tip head is formed into a semicircular shape 7. The bulb is placed in contact with the base of the semicircular shape 7 to form a double tube wall, and a bead 2 for sealing is provided below in the bulb, and a bead 4 for positioning is provided above the bead 2, and both beads 2 are provided. , 3 through which two lead wires 6, 6 are inserted, and a mount A having a filament 5 provided at the tip of the lead wire is placed in contact with the glass cutting tube 3. small light bulb. 2. A small light bulb with a double tube wall structure according to claim 1, in which the semicircular molded portion 7 at the tip end is a lens sphere 7. 3. A small light bulb with a double tube wall structure as claimed in claims 1 and 2 of the utility model registration, in which the exterior glass bulb 1 is filled with halogen gas.