JPH0622923Y2 - Vehicle headlights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a headlight mounted on an automobile.

[Conventional technology]

For example, as shown in FIGS. 7 and 8, the passing beam filament 21A is placed on the traveling beam filament 21B.
With a C-8 / C-8 light bulb 21 arranged below and a focal point (focal length F1,
There is a combination of upper and lower split parabolic reflectors 22 having F2) so as to form a bright light distribution with an emphasis on the passing beam pattern (Japanese Patent Application No. 58-12).
483, Japanese Patent Application No. 61-85494).

[Problems to be solved by the invention] However, in such a structure, since the traveling beam filament 21B is farther from the focus of the reflector 22 than the passing beam filament 21A, the reflector 2
The spread of the reflected light of 2 becomes larger than the passing beam,
Spot beam distribution cannot be obtained. Further, because of the above-mentioned reason, concentrated intense light cannot be obtained, and it is also impossible to increase the road surface visibility at the time of the traveling beam.

An object of the present invention is to provide a vehicular headlamp capable of obtaining a bright spot-like traveling bead light distribution and improving the road surface visibility at the time of a traveling beam.

[Means for Solving the Problems]

The present invention relates to a vehicle headlamp using an upper / lower two-part rotary parabolic reflector, in which a passing beam filament is located in front of a focal point of an upper reflecting surface located on the central axis of the reflector and slightly below the central axis. At a position above the traveling beam filament parallel to the axis, the traveling beam filament is arranged in front of the low beam filament and parallel to the central axis, and the filament is provided above the traveling beam filament. A hood having a shape that does not block light that reaches in the left-right direction of the upper reflecting surface from the upper reflecting surface, and the lower reflecting surface of the reflector has a focal length that is the same as or longer than the focal length of the upper reflecting surface; When the length of the beam filament is e, the focal point is located at a position on the optical axis e / 2 to e / 4 in front of the rear end of the traveling beam filament. It is characterized in that it has formed to have.

〔Example〕

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

1 to 3 show an embodiment of the present invention, and 1A
The passing beam filament, 1B is a traveling beam filament, and 2 is an upper and lower split parabolic reflector. Reflective surface A above the central axis of this reflector 2
Sets the focal length F1 to 20 to 35 mm and the focal position to f1. The lower reflecting surface B has a focal length F2 of 20.
~ 35 mm, focus position is f2. The focal lengths of both reflecting surfaces A and B are set to be the same or F1 <F2.

The passing beam filament 1A is displaced from the center axis of the reflector by a dimension a and upward from the focal position f1 by dimension b. a is 0 to 1 mm, b is 0.5 to
2mm Length c of passing beam filament 1A
Is 4 to 6 mm.

Further, the traveling beam filament 1B has a dimension d (d = 0.5 to 0.5 mm) from the tip of the passing beam filament 1A.
3mm) Spaced and placed on the central axis of the paraboloid of revolution. The length e of the traveling beam filament 1B is 4 to 6 mm.
A light shielding hood 1C is attached to the upper side of the traveling beam filament 1B. The hood 1C is 180 °-
The width is (h1 + h2) so that the left and right light of the traveling beam is not blocked.

Although not shown, the lens is provided on the front surface.

Spot light images of the passing beam and the traveling beam reflected from the reflector 2 of the headlight having the above structure and the progress state are shown in FIGS. 4 (A), (B), and FIGS. 5 (A), (B).

The passing beam spot light A ′ by the reflecting surface A has a fan-shaped pattern that spreads downward because the passing beam filament 1A is in front of the reflector focus f1, and the distance between the filament 1A and the focus f1 is short, so the image size is small. Become. This spot light A'is used for the purpose of brightening the far side of the road surface, and the lens cut corresponding to the reflection surface A is a cut that emphasizes the light distribution formation of the low beam.

The traveling beam spot light A ″ from the reflecting surface A is transmitted by the traveling beam filament 1B to the passing beam filament 1A.
If the hood 1C is not provided, the fan pattern becomes wider than the passing beam because it is farther from the focal point f1. However, the dotted line portion is cut by the hood 1C and only the laterally long spot light suitable for the traveling beam is obtained. As a result, a feeling of switching occurs and it becomes easy to see at a distance.

On the other hand, the passing beam spot light B ′ due to the reflecting surface B
, The passing beam filament 1A is behind the reflector focal point f2, and therefore has a fan-shaped pattern that spreads downward similarly to the spot light A'described above. As for the size of this pattern, since the distance between the filament 1A and the focal point f2 is large,
It becomes larger than the spot light A '. The passing beam by the reflecting surface B becomes light for illuminating the front side of the road surface.

The traveling beam spot light B ″ from the reflecting surface B is substantially at the center of the traveling beam filament 1B (g from the rear end of the filament).
Since the focal point f2 is at the dimensional position, g = e / 2 to e / 4), a bright, concentrated circular beam pattern is obtained. Since this reflected light is a strong light in which the spot light is small and concentrated, it is not diffused so much by the lens cut, and is made into a spot-like light distribution that brightly illuminates the distance on the road surface. Therefore, the lens cut corresponding to the reflection surface B is a cut with an emphasis on the light distribution formation of the traveling beam.

FIGS. 6 (A) and 6 (B) are light distribution patterns, in which the passing beam is a pattern for illuminating a wide range of road surfaces, and the traveling beam is a spot-like pattern in which the far side of the road surface is bright. The dotted line portion in the figure is the hot zone.

[Effect of device]

As described above, according to the present invention, the traveling beam filament is arranged at the focal point of the lower reflecting surface of the upper and lower two-division rotary parabolic reflector, and the passing beam filament is arranged before the focal point of the upper reflecting surface. The traveling beam distribution can be made bright and spot-like without sacrificing the beam distribution. In addition, it is easy to see far from the road. Further, since the hood is provided on the upper side of the traveling beam filament, a clear switching feeling can be provided when switching between the traveling beam and the deviation. In addition, the brightness of the passing beam is double that of the headlight that uses the H4 light bulb because the beam is formed by the entire reflector without blocking the light with the hood, and the amount of road surface illumination light of the traveling beam is increased. Have the same advantage.

[Brief description of drawings]

FIG. 1 is a front view (front lens removed state) showing an embodiment of a vehicle headlamp according to the present invention, and FIG. 2 is II-II of FIG.
A line sectional view, FIG. 3 is a sectional view taken along line III-III in FIG. 1, and FIGS. 4 (A) and 4 (B) are patterns of passing beam spots and traveling beam spots of the same embodiment, and FIG. 5 (A) ( FIG. 6B is a front view showing a conventional example, and FIG. 6A and FIG. 6B are light distribution patterns of the same embodiment. FIG. 1A ... passing beam filament, 1B ... traveling beam filament, 1C ... shielding hood, 2 ... upper and lower split parabolic reflector, A ... upper reflecting surface, B ... lower reflecting surface.

Claims (1)

[Scope of utility model registration request] 1. A vehicular headlamp using an upper and lower two-part rotary parabolic reflector, wherein a passing beam filament is located in front of the focal point of an upper reflecting surface located on the central axis of the reflector, and from the central axis. The traveling beam filament is located slightly above and parallel to the axis, and the traveling beam filament is arranged in front of the passing beam filament and parallel to the central axis, and above the traveling beam filament. A hood having a shape that does not block light that reaches from the filament to the left and right of the upper reflecting surface is provided, and the lower reflecting surface of the reflector has the same or longer focal length as the focal length of the upper reflecting surface, and When the length of the traveling beam filament is e, it is located at a position on the optical axis e / 2 to e / 4 in front of the rear end of the traveling beam filament. Vehicle headlamp is characterized in that formed so as to have a point.