JPS62234801A - Compound reflector for head lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a parabolic reflector for a headlamp that is attached to a vehicle such as an automobile, and particularly relates to a composite reflector having a plurality of reflecting surfaces. be.

[Conventional technology]

Generally speaking, this type of composite reflector is
The structure disclosed in Japanese Patent No. 5002 is known.

The main parts of this known reflecting mirror are shown in FIGS. 6 and 7. In these figures, 10 is a compound reflecting mirror, 11 is a front lens, and the compound reflecting &i10 has a parabolic cylinder surface 10a whose reflecting surface is divided into a plurality of parts in the vertical direction.

[Problem that the invention seeks to solve]

In the conventional compound anti-18 mirror, each parabolic cylindrical surface is formed in a series in the vertical direction, and is not distinguished as a traveling or passing deflector-reflecting surface. Considering the light balance, the lens cut of the front lens 11 and the setting of each parabolic cylinder surface are determined respectively! Not only is it extremely difficult to adjust them, but there is also a large step difference between the reflective surface for the traveling beam and the reflective surface for the low beam, especially the part that reflects light 15 degrees above the low beam. There is a problem in that glare light is generated at the boundary portion of this step.

In addition, even in the spot pattern of the 15° upward angle of the passing beam, there is a problem that a valley is formed between the horizontally spread part and that part becomes a dark part, and there is a significant step difference in each reflection area, so the mold for manufacturing it is required. It has various problems such as complicated processing.

[Means for solving problems]

As a specific means for solving the above-mentioned problems, the present invention is characterized in that a conical surface is formed in a portion of a composite reflecting mirror formed of a large number of parabolic cylindrical surfaces and below a horizontal line passing through the center. The present invention provides a composite reflector for a headlamp, which has a conical surface group.
Not only is there no step difference and glare light is not generated, but there is also no cut in the 15° upward portion of the passing beam.

〔Example〕

Next, the present invention will be explained in more detail based on several illustrated embodiments. First, in the first embodiment shown in FIGS. It is formed by arranging columnar surfaces 2 adjacent to each other. A light source mounting part 3 is provided approximately in the center of this composite reflector, and a vertical line (■) passing through the center from the front and a horizontal line (1!) pass through the center. a 1'' allows you to distinguish between the top, bottom, left and right of the reflective surface.

In such a composite reflecting mirror 1, a conical surface 4 is formed below the horizontal line and in a part of the reflecting mirror. As shown in Fig. 2, this cone 4 has its X, Y, and Z coordinates set with the center of the reflecting mirror as O, and its two axes are centered on the intersection line between the parabolic cylinder surface 2 and the Xz plane. By rotating it in the direction shown by arrow a, a conical surface 4 is formed. When this cone is stopped at an appropriate position, a step is created between it and the parabolic cylinder surface at the bottom, and this becomes the end line β' of the conical surface 4. Therefore, the intersection line 1 can be said to be substantially the Yund line of the upper parabolic cylinder surface.

The optical image of the filament, that is, the state of reflection on the conical surface 4 formed in this way will be explained with reference to FIGS. 3 and 4. The light source used is an example of a C-8/C-8 bulb such as an H4 bulb. First, in FIG. 3, 5 is a running filament, and 6 is a passing filament. When the running filament 5 is placed on or slightly behind the general focus f of each parabolic cylinder group, the running filament 5 becomes A filament 1I5a is obtained on the end line 1 of the parabolic cylinder surface 2, and a filament pattern 5b is obtained by reflection on the front surface of the reflecting mirror, in which the conical surface 4 is centered on the end line 1 of the parabolic cylinder surface with the Z axis. Since the filament pattern 5b is formed by rotating the filament pattern 5b, the filament pattern 5b also moves along the arrow a' from the horizontal line H in accordance with the rotation.

Moreover, as shown in FIG. 4, when the passing filament 6 is placed in front of the general focus f of the parabolic cylinder group, the filament Ig+6a is placed on the end line of the parabolic cylinder.
is obtained, and this is reflected to form a filament pattern 6b obtained on the front surface of the reflecting mirror, with the conical surface extending 2
Because it is formed by rotating around an axis,
Corresponding to this rotation, the filament pattern 6b also moves so as to rotate along the arrow a'' from the horizontal line H.

The arrangement when the running filament 5 is turned on, assuming that the conical surface 4 with such characteristics is the reflective area A, the area above the horizontal line H is the reflective area B, and the area below the horizontal line H is the reflective area C. The light pattern is as shown in FIG. That is, since a 1"4 bulb (halogen bulb) is used as a light source, when the light source is above the focal point or behind it, the left and right sides are reversed with respect to the vertical 1av, and the conical surface 4 is formed. Pattern A' is projected on the left side of reflective area A, and pattern B' of other areas B and C.

C' are located above and below, respectively, resulting in a light distribution pattern that spreads in the lateral direction as a whole.

When the passing filament 6 is turned on, the passing filament 6 is inverted vertically with respect to the horizontal line 1 because it is located at a higher position than the focal position. Therefore, as shown in FIG.
A pattern A' is formed above the horizontal line H with an upward slope of approximately 15 degrees, and a pattern B' is formed below the horizontal line H in the reflective area B. Note that there is no reflected light in the reflection area C because there is a hood under the passing filament and light to this area is blocked.

No matter which filament is turned on, the reflection at the reflective area A of the conical surface 4 forms a fan-shaped pattern as a whole, and the light is reflected with appropriate brightness to the area where the light is needed. In addition, the conical surface 4 is formed so that the boundary with the upper parabolic cylinder surface 2, that is, the end line λ of the parabolic cylinder surface, has virtually no step, and the generation of glare tip in the passing beam is eliminated. .

In the second Oura example shown in Figures 7 to 10, the conical surface 4 is arranged symmetrically with respect to the vertical line ■,
It is designed to be immediately compatible with both left-hand traffic and right-hand traffic. In addition, the parabolic cylinder surface 2 and the conic surface 4
The means for forming is substantially the same as that of the first embodiment. When the right conical surface is set as the anti-eA area A and the left conical surface is set as the reflective area A2 in the conical cones 4 provided on the left and right sides, when the traveling filament is turned on, the patterns of each area A', A2 ', B', and C' are combined to form the light distribution pattern shown in FIG. 8, and when the passing lineman 1- is turned on, the light distribution pattern becomes either FIG. 9 or FIG. 10. The light distribution pattern shown in Fig. 9 is for right-hand traffic, and only patterns A' and B' of reflection areas A and B occur, and anti-tI4 areas A2 and C are formed by a hood provided at the bottom of the filament for passing each other. This blocks the light and prevents reflected light from occurring. On the other hand, FIG. 10 shows a light distribution pattern for left-hand traffic, in which patterns A' and B' of reflection areas A and B occur, and patterns due to reflection in other areas do not occur.

In this case, by preparing a composite reflector in advance, it is possible to arbitrarily select whether to drive on the right or on the left depending on the mounting angle of the hood attached to the passing filament. Even if the conical surfaces are in symmetrical positions, there will be no problem in turning on the traveling beam.

Furthermore, a third embodiment shown in FIGS. 11 to 13 will be described. In this embodiment, a conical surface is used to concentrate the strong light of the traveling beam at the center. In other words, below the horizontal line H, which is not used as the reflective area of the passing filament, the conical surface 4
It is sufficient to form it broadly. As described in the first embodiment, the cone 4 is formed by rotating it around the Z axis, so that the light reflected from that surface is concentrated at the center.

Therefore, in FIG. 11, most of the lower part of the horizontal line H on both sides is formed as a conical surface 4, and a parabolic cylinder surface 2 is formed near the middle.
’. Then, the reflective area on the conical surface 4 is set to A1. A2. In addition to dividing it into A3, the upper part from the horizontal line T1 is the reflective area B, and the lower part is the reflective surface 1ii.
Looking at the light distribution pattern as c, when the running filament is turned on, the light distribution pattern becomes as shown in Fig. 12,
Reflection area A1. The patterns A1' and A2' of A2 condense light in the central part, and the condensed part partially overlaps the horizontal line H, forming a high illuminance range in the central part.

Also, when the filament for passing is turned on, the first
As shown in Figure 3, for example, if you drive on the right side, most of the light from the reflection area formed by the conical surface 4 on the left side is blocked, and a part of the reflection area A1 on the right side and the reflection area A3 are diagonally 1
By forming 5° patterns A' and Δ3', an ideal light distribution pattern of the beam for misalignment can be obtained.

In either embodiment, the conical surface is formed by rotating the parabolic cylinder surface around the Z axis in the XZ plane!
In addition, since it is formed continuously with the parabolic cylinder surface with almost no difference in level, no glare light due to the difference in level is generated when the line for passing each other is turned on.

〔Effect of the invention〕

As explained above, the composite reflector for a headlamp according to the present invention has a conical surface formed on a part of the reflective surface formed by a large number of parabolic cylinder surfaces, so that the reflective area of the conical surface can be It can be effectively used as a light distribution pattern with a 15" inclination in the beam. Furthermore, since the cone and the parabolic cylinder surface are continuous and have no steps, not only is there no glare, but the 15" upward slope It has various excellent effects, such as a light distribution pattern with no breaks in the area, and at the same time making molding easier.

Further, by providing the conical surfaces symmetrically, it has the excellent effect of being able to be used for both left-hand traffic and right-hand traffic.

Furthermore, the light from the passing filament does not reflect on the conical surface (by forming it in the majority of the rotation, the light is focused in the center when the running filament is turned on, making it possible to see it from a distance in the case of far-field illumination). It also has the same effect.

[Brief explanation of drawings]

FIG. 1 is a front view showing a composite reflecting mirror according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the means for forming a conical surface in the same embodiment, and FIG. An explanatory diagram for explaining the reflection situation of the running filament on the conical surface, FIG. 4 is an explanatory diagram for explaining the reflection situation of the passing filament on the conical surface in the same example, and FIG. FIG. 6 is a light distribution pattern diagram of a passing beam in the example, FIG. 7 is a front view showing a composite reflector according to a second embodiment of the present invention, and FIG. 8 is a diagram showing a light distribution pattern of a passing beam in the example. is a light distribution pattern diagram of the traveling beam of the same example,
FIG. 9 is a light distribution pattern diagram of a passing beam when driving on the right side of the same embodiment, FIG. 10 is a diagram showing a light distribution pattern of a passing beam when driving on the left side, and FIG. 11 is a diagram showing a light distribution pattern of a passing beam when driving on the left side.
A front view showing the composite anti-rJ4tA of the embodiment, FIG. 12 is a light distribution pattern diagram of the running beam of the same embodiment, FIG. 13 is a light distribution pattern diagram of the passing beam of the same embodiment, and FIG. 14 is a diagram of the conventional example. FIG. 15, which is a front view of the composite reflecting mirror, is a sectional view taken along the line xv-xvii in FIG. 14 when a lens is attached to the compound reflecting mirror. 1... Composite reflection 1 2.2'... Parabolic cylinder surface 3
...Light source mounting position 4...Conical surface 5...Filament for running 6...Ficimen for passing each other 1- Sea lion...Horizontal line ■...Vertical line separation ~! Ward e) Irregular procedure amendment mouth April 17, 1988

Claims (3)

[Claims] (1) A composite reflector for a headlamp, characterized in that the composite reflector is formed of a large number of parabolic cylindrical surfaces, and a conical surface is formed in a portion of the mirror below the horizontal line passing through the center. (2) The composite reflector for a headlamp according to item 1 above, wherein the conical surface is symmetrically provided with respect to a vertical line. (3) The composite reflector for a headlamp according to item 1 above, wherein conical surfaces are formed in most of the positions where the light of the passing filament is not reflected.