JPH0345366Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a headlamp that is attached to a vehicle such as an automobile and has a built-in multiple reflector.

[Prior Art] As this type of headlamp, one having a configuration disclosed in, for example, Japanese Utility Model Application Publication No. 118201/1983 filed by the same applicant is well known. The reflector in this conventional example is basically divided into two upper and lower reflecting mirror parts, and is configured to efficiently reflect reflected light from the upper and lower reflecting mirror parts downward with respect to the horizontal line H. . Therefore, compared to a general single parabolic reflector, a pattern of passing beams with less glare above the horizontal line H can be formed. However, a single parabolic reflector has a high degree of concentration of light, and is particularly advantageous for forming the maximum luminous intensity band required for the light distribution pattern of the traveling beam. Furthermore, even in the case of a single parabolic reflecting mirror, when the vertical width of the reflecting surface becomes smaller, the amount of light above and below the horizontal line H decreases, and a pattern of passing beams with less glare light can be formed.

[Problems to be solved by the invention] In the conventional multiplex reflector,
Although it is possible to improve the light distribution performance of passing beams,
There are problems in that it is difficult to form a maximum luminous intensity band (hot spot) in the traveling beam, and the maximum luminous intensity value is insufficient.

[Means for Solving the Problems] As a specific means for solving the above-mentioned problems, the present invention forms the paraboloid of the reflector into a paraboloid whose focal positions are different in at least the upper, lower, and middle three parts. , the focal point of the lower paraboloid is located more than the length of the passing filament in front of the focal point of the upper paraboloid, the passing filament is positioned between the upper and lower focal points, and the focal position of the intermediate paraboloid is is located near the center of a passing filament or a running filament, and the reflected light from the intermediate paraboloid is reflected from either the passing beam or the running beam. Located approximately in the center of the light distribution pattern,
In the case of a passing beam, visibility is improved over a relatively long distance, and in the case of a running beam, it is easier to form the maximum luminous intensity band and the lack of light quantity is resolved.

[Embodiments] Next, the present invention will be explained in more detail with reference to the illustrated embodiments. Reference numeral 1 denotes a reflector, and the reflector is a multiplex reflector divided into three parts: upper, lower, and middle. That is, it is divided into an upper paraboloid A, a lower paraboloid B, and an intermediate paraboloid C, and each paraboloid is configured to have a different focal position.

The light bulb 2 used by being attached to the reflector 1 configured in this way has a traveling filament 3 and a passing filament 4, and the arrangement positional relationship between these filaments and each of the divided paraboloids is determined according to the plan. Thus, a light distribution pattern can be obtained.

That is, the traveling filament 3 is located below the optical axis XX, and its front end is located near the focal point _f2 of the paraboloid B (see FIG. 5). The above-mentioned passing filament 4 is located approximately on the optical axis XX, and is located between the focus f ₁ of the paraboloid A and the focus f ₂ of the paraboloid B (see FIG. 7). The focal point _f3 of the intermediate paraboloid C is set to be approximately at the center of the traveling filament 3 or the passing filament 4 (see FIG. 3). In this case, the focal point f ₃ can be set so that the desired light distribution pattern can be obtained no matter which one of the two filaments is selected. It is included. In the figure, 5 is a lamp cover, H is a horizontal line, and V is a vertical line.

By specifying the arrangement relationship between each paraboloid of the reflector 1 and both filaments,
The desired light distribution pattern can be obtained. That is, as shown in FIG. 4, when the reflector 1 is roughly formed into upper, lower, and intermediate paraboloids or reflecting parts A, B, and C, when the traveling filament 3 is turned on,
The light distribution pattern shown in FIG. 6 is obtained. As is clear from this light distribution pattern, the pattern C' of the reflected light reflected by the middle paraboloid C overlaps the hot spot pattern B' reflected by the lower paraboloid B at approximately the center. In addition to increasing the amount of light, the hot spot pattern B' is given a predetermined spread to widen the field of view. The pattern A' reflected by the upper reflecting section A is configured to irradiate the lower part of the horizontal line H with an ideal spread.

Furthermore, when the passing filament 4 is lit, as shown in Fig. 8, the patterns A' and B' on the upper and lower paraboloids not only illuminate the lower part of the horizontal line H with a predetermined spread. , a pattern C' of reflected light reflected by an intermediate paraboloid C is irradiated approximately equally across the vertical line V and the horizontal line H with a predetermined spread approximately in the center, and the pattern C' Therefore, visibility at a certain distance is also improved. Note that the pattern C' is different in character from what is generally called glare light.

[Effects of the invention] As explained above, in the vehicle lamp according to the invention, the paraboloid of the reflector is formed into a paraboloid in which the focal positions of at least the upper, lower and middle parts are different, and the focal position of the lower paraboloid is different from that of the lower paraboloid. is located in front of the focal point of the upper paraboloid by more than the length of the passing filament, and the passing filament is positioned between the upper and lower focal points, and the focal position of the intermediate paraboloid is positioned in front of the passing filament or the running filament. By configuring it to be located near the center, the reflected light from the intermediate paraboloid is located approximately at the center in both the passing beam and the running beam. , it is easy to form the highest luminous intensity zone (hot spot zone), and it has the excellent effect of being able to obtain approximately the same amount of light as a single parabolic reflector.

In addition, in the case of passing beams, the reflected light from the intermediate paraboloid is irradiated with an appropriate spread near the horizon, which has the excellent effect of improving visibility over relatively far distances.

[Brief explanation of drawings]

FIG. 1 is a front view of a reflector used in a vehicle lamp according to the present invention, FIG. 2 is a vertical cross-sectional side view of the approximately central portion of the reflector, FIG. 3 is a cross-sectional side view of approximately the central portion of the reflector, and FIG. The figure is a schematic front view of the reflector, Figure 5 is a schematic side view showing the arrangement position of the traveling filament in the reflector, Figure 6 is a light distribution pattern diagram when the traveling filament is turned on, and Figure 7 is A schematic side view showing the arrangement position of the passing filament in the reflector,
FIG. 8 is a diagram showing a light distribution pattern when passing filaments are lit. H...Horizontal line, V...Vertical line, 1...Reflector, 2...Light bulb, 3...Travelling filament, 4
...passing filament, A...upper paraboloid,
B...lower paraboloid, C...middle paraboloid, X...optical axis.

Claims (1)

[Scope of utility model registration request] The paraboloid of the reflector is formed into a paraboloid in which focal positions of at least the upper, lower, and middle portions are different;
The focal point of the lower paraboloid is located in front of the focal point of the upper paraboloid by more than the length of the passing filament, and the passing filament is positioned between the upper and lower focal points, and the focal position of the intermediate paraboloid is A vehicle headlamp characterized in that it is located near the center of a passing filament or a traveling filament.