JPS634325Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vehicular headlamp, and more particularly to a vehicular headlamp that uses a bulb having two filaments, a main and a sub-filament.

[Background of the idea]

For vehicle headlights, especially for automobiles, C-
6/C-6 type bulb (hereinafter referred to as C-6/C-6 type bulb) that is perpendicular to the optical axis and has two filaments, a main filament and a sub filament in the horizontal direction. be. A conventional headlamp using this type of bulb is shown in FIG.

Reflector b that reflects the light emitted from the main filament of bulb a almost parallel to the optical axis
, a lens d that covers the front surface of the reflector b, and a bulb a disposed between the two members so that the filament is positioned approximately at the focal point of the reflector b. Here, the positions of subfilaments a ₂ and a′ ₂ are reversed when used in left-hand driving countries such as Japan and right-hand driving countries such as the United States, and the left side In the case of traffic, the subfilament _a2 is placed to the upper left of the main filament _a1 , as shown in FIG. In the case of driving on the right side, the subfilament a' ₂ is placed to the upper right of the main filament a' ₁ , as shown in FIG. FIG. 4 shows a light distribution pattern for a headlight for right-hand traffic. This figure shows the reflected light from the reflective surface of reflector b when subfilament a′ ₂ is turned on, and it is divided equally into upper and lower angles based on the curvature of the reflector from the center with the center at 0°. The rectangles shown at each point every 15° on both the left and right sides are subfirants.
This is a reflection of a′ ₂ itself. The area A surrounded by hatching in the center shows the reflection range from the reflector by condensing the reflection state at each point. Hereinafter, the 0° vertical line will be referred to as a vertical line V-V, and the 0° horizontal line will be referred to as a horizontal line H-H. Most of the reflection range shown in this area A is closer to the right side than the horizontal line H-H.
Although the reflected light is lower than the horizontal line H-H, the reflected light also reaches the upper side of the horizontal line H-H. As shown in the figure, the reflected light emitted above the horizontal line H-H is by no means small, and when lighting the subfilament, the light distribution pattern must be set below the horizontal line H-H. The desired light distribution pattern is not achieved as a passing beam. For this reason, measures have been taken to lower the light distribution pattern by forming a prism on the lens that covers the front surface of the reflector, but if the light distribution pattern is lowered by the prism,
Not only does it lower the light distribution pattern when the main filament is turned on, which originally requires an upward light distribution pattern, but the lens becomes thicker due to the prism formation, causing sink marks on the surface and poor visibility. There are problems such as:

[Purpose of invention]

The object of the present invention is to provide a headlamp using a C-6/C-6 type bulb, in which when the subfilament is turned on, the light distribution pattern of the reflected light by the reflector can be achieved as desired without using a prism or the like. The purpose is to provide a vehicle headlight that has a pattern.

[Summary of the idea]

In order to achieve the above object, the present invention provides a vehicle headlamp that uses a bulb in which two filaments, a main filament and a sub filament, are arranged perpendicular to the optical axis, with the sub filament of the bulb being placed above the optical axis. It is characterized by being large in size, eccentrically centered to the right or left of the optical axis, and tilted at an angle of 5° to 30° with respect to the horizontal line perpendicular to the optical axis so that the outside faces upward. .

〔Example〕

Below, a fifth embodiment of the vehicle headlight of the present invention will be described.
This will be explained with reference to the figures and FIG.

In this embodiment, the reflector etc. are the first one in the conventional example.
It has the same configuration as shown in the figure. FIG. 5 is a vertical cross-sectional view of the center of the bulb 1 showing the arrangement of the main filament 11 and the sub-filament 12, similar to FIG. 3 shown in the conventional example, and is applied to a lamp for right-hand traffic. The top, bottom, left, and right of the drawing match the actual top, bottom, left, and right. The center of the bulb 1 coincides with the reflection center of the reflector 1, that is, the optical axis f. At the bottom left of this optical axis f is the main filament 1.
1 is placed horizontally. Above the optical axis f, there is a subfilament 12 whose center is eccentric to the right of the optical axis f and tilted upward to the right with respect to the horizontal direction.
It is arranged at an angle θ of 5°. FIG. 6 shows a light distribution pattern of a lamp using the bulb 1 in which the main and sub filaments are arranged in this manner.

6 shows the light reflected by the reflecting surface of the reflector when the subfilament 11 is turned on, similar to FIG. It is divided into equal parts at an angle based on the degree of curvature, both top, bottom, left and right.
The rectangles shown at each point every 15 degrees are the reflections of the subfilament 11 itself. Area B surrounded by hatching in the center shows the condensed reflection state at each point as the reflection range from the reflector. In the reflection range indicated by this region B, most of the reflected light reaches below the horizontal line H-H, while being closer to the right side of the vertical line V-V. Only a small amount of reflected light travels above the horizontal line H-H, resulting in a substantially desired light distribution pattern as a passing beam.

By creating such a light distribution pattern when the sub-filament is lit, there is no need for the lens covering the front surface of the reflector to have a prism effect, and therefore there is no adverse effect on the light distribution pattern when the main filament is lit. Furthermore, since the lens does not become thick, sink marks do not form on the surface and the appearance does not deteriorate. In the above example, the angle θ between the subfilament 12 and the horizontal direction was set to 5 degrees, but if the angle is within the range of 5 degrees to 30 degrees,
Almost the same light distribution pattern can be obtained.

The above embodiments have been described for those for right-hand traffic, but as shown in FIG. If the arranged bulbs are used, a light distribution pattern for left-hand traffic, that is, a light distribution pattern whose left and right sides are reversed from that shown in FIG. 6 will be obtained. Furthermore, in the above description, examples have been given in which the main filament is arranged off the optical axis f, but the main filament may be arranged on the optical axis f in any case. Figures 8 and 9 show an arrangement in which the main filament is on the optical axis. In Figure 8, the main filament 31 is horizontal on the optical axis f of the right-hand traffic valve 3, and the right Subfilament 3 with rising angle θ
There are 2. FIG. 9 is for left-hand traffic, and the main filament 31' and sub-filament 32' of the valve 3' are arranged in the opposite direction from those shown in FIG.

[Effect of idea]

As is clear from the above explanation, according to the vehicle headlight according to the present invention, when the subfilament is turned on, it is possible to obtain the light distribution pattern necessary for a passing beam without correcting the light distribution pattern with a lens or the like. .

[Brief explanation of drawings]

Figures 1 to 4 show conventional vehicle headlights, with Figure 1 being a longitudinal sectional view and Figure 2 being the same as in Figure 1.
FIG. 3 is a side view showing another example of the same cross section as FIG. 2, and FIG. 4 is an explanatory diagram of a light distribution pattern. 5 and 6 show one embodiment of the present invention, FIG. 5 is a vertical cross-sectional view of the bulb, FIG. 6 is an explanatory diagram of the light distribution pattern, and FIG. 7 is a reverse arrangement of the bulb. 8 and 9 are longitudinal sectional views of a bulb with the main filament placed on the optical axis. FIG. 8 is an example corresponding to FIG. 5, and FIG. 9 is an example corresponding to FIG. 7. This is a corresponding example. 1... Valve, 11... Main filament,
12...Subfilament, f...Optical axis.

Claims (1)

[Scope of utility model registration request] A vehicle comprising a reflector, a lens disposed in front of the reflector, and a bulb disposed between the reflector and the lens and having two filaments, a main filament and a sub filament, disposed near the focal point of the reflector in a direction orthogonal to the optical axis. In the headlights for
The subfilament of the bulb is above the optical axis, with its center eccentric to the right or left of the optical axis, and at an angle of 5° to the horizontal line perpendicular to the optical axis.
A vehicle headlight characterized by being inclined at a 30° angle with the outside facing upward.