JPH0451936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light bulb used in a vehicle lamp.

[Conventional technology]

Conventionally, light bulbs for vehicle lighting equipment have a ring on the base, and the light bulb is positioned on the installation side through this ring, so that the light bulb can be installed in the correct position such as the top and bottom of the bulb. The central axis is made to coincide with the central axis of the light bulb mounting part, that is, the filament disposed on the central axis of the light bulb is positioned on the central axis of the light bulb mounting part.

[Problem that the invention seeks to solve]

Some modern light bulbs have a main filament placed on the central axis of the light bulb, and a sub-filament placed above the main filament. Therefore, there was a drawback that the upper surface of the glass bulb bulged and turned black.

Therefore, in order to prevent the upper surface of the glass from bulging and darkening, one possible measure is to lower the sub-filament and place it closer to the center axis of the bulb, thereby increasing the distance between the sub-filament and the glass bulb. In this case, the main filament and the sub-filament each deviate from the set position when the light bulb is attached, resulting in a problem that a predetermined light distribution cannot be obtained.

[Means for solving problems]

The present invention has been made in consideration of the above-mentioned conventional problems, and includes a filament disposed below the center axis of the light bulb, and a convex part that comes into contact with the light bulb mounting part when the light bulb is installed and tilts the center axis of the light bulb. The present invention solves the conventional problems by providing a light bulb characterized in that a portion is provided in a ring of a base, and the filament can be placed on a central axis of a light bulb mounting portion.

[Effect]

In the present invention, the distance between the top surface of the glass bulb and the filament is increased to prevent the top surface of the glass bulb from bulging and blackening, and the filament is mounted on the bulb without changing the structure of the bulb mounting section. will be placed on the central axis of the section.

〔Example〕

Next, the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 9.

In the figure, reference numeral 1 designates a light bulb with a ring 3 attached around a base 2, and is provided with two filaments: a main filament 4 and a sub-filament 5 located above the main filament 4.

The main filament 4 is arranged below the light bulb central axis a by bending the lead-in wire downward, and the lead-in wire supporting the sub-filament 5 is also bent downward. The sub-filament 5 is also arranged on the central axis a of the light bulb.

Further, the ring 3 has a pair of protrusions 7 symmetrically protruding from the upper edge side, and a protrusion 8 protruding from the center of the lower edge side. , the convex parts 7 and 8 come into contact with the light bulb mounting part 9 and the light bulb 1 is in an inclined state, and the main filament 4 is arranged on the central axis b of the light bulb mounting part, and the sub-filament 5
The distance A between the glass bulb 6 and the top surface 60 of the glass bulb 6 is large.

The above-mentioned convex portions are not limited to the protrusions shown in Figs. 2 and 3, but may also be protrusions extending toward the center of the ring or protrusions along the periphery of the ring. The shape and position are not limited, and may be formed by bending the upper edge of the ring (see FIGS. 4 to 9).

〔Effect of the invention〕

As explained above, according to the present invention, the filament is arranged below the center axis of the light bulb, and the ring of the base is provided with a convex portion that comes into contact with the light bulb mounting part and tilts the center axis of the light bulb when the light bulb is installed. Since the filament can be placed on the central axis of the light bulb mounting part, when the light bulb is mounted, the light bulb is mounted at an angle with respect to the central axis of the light bulb mounting part, and the distance from the top surface of the glass bulb is large. This makes it possible to prevent bulging and blackening of the top surface of the glass, and the filament is placed in the appropriate position to provide the desired light distribution, making it more practical as there is no need to change the shape of the bulb mounting part. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the light bulb according to the present invention, FIG. 2 is an explanatory diagram showing the front of the ring in one embodiment, FIG. 3 is an explanatory diagram showing the side of the ring, and FIG. to FIG. 9 are explanatory diagrams showing other rings. 1...Light bulb, 3...Ring, 4...Main filament, 5...Sub-filament, 6...Glass bulb,
60... Upper surface portion, 7, 8... Convex portion.

Claims (1)

[Claims] 1. The filament is arranged below the central axis of the light bulb, and a convex part is provided on the ring of the base to incline the central axis of the light bulb by contacting the light bulb mounting part when the light bulb is installed, and the filament is placed below the center axis of the light bulb mounting part. A light bulb characterized by being able to be placed.