JPS63266702A - Composite reflective mirror 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 reflective 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. 14 and 15. In these figures, 10 is a compound reflecting mirror, 11 is a front lens, and the compound reflecting surface 1110 has parabolic cylinder surfaces 10a and 10b which are vertically divided into a plurality of reflecting surfaces.

Figure 16 shows a light distribution pattern of passing beams obtained by a known reflecting mirror, where A is the light from 10a, and the mouth is from 10a.
The light is from b, and ha is its valley.

(Problems to be Solved by the Invention) The conventional composite reflecting mirror has a problem in that there is a large step between 10a and 10b, and glare light is generated at the boundary, especially at the horizontal step line 10c. .

Also, in the spot pattern of the 15° upward angle of the passing beam shown in Fig. 16, there is a valley between the horizontally spread part and that part becomes a dark part, and the difference in level in each reflection area is significant. There are various problems in that the machining of the molds involved in manufacturing is complicated.

[Means for solving problems]

As a specific means for solving the above problems, the present invention provides a composite reflecting mirror formed of a large number of parabolic cylindrical surfaces, in which a single-lobed hyperboloid or conical surface is formed below and in part of the horizontal line passing through the center. The present invention provides a composite reflector for a headlamp that is characterized by the following: - By forming a Tokyo curved surface or a group of conical surfaces, there is no step and there is no glare.
Not only is no light generated, but there is 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. 1 to 4, 1 is a composite reflecting mirror, and It is formed by arranging parabolic cylindrical surfaces 2 adjacent to each other. A light source mounting part 3 is provided approximately at the center of this composite sheet 1) Jm, and a vertical line 1 and a horizontal line 1 pass through the center when viewed from the front.
You can distinguish the reflective surface into upper and lower cloth.

In such composite reflection R1, a single-lobed hyperboloid 4 is formed below the vicinity of the horizon and in a part of the reflecting mirror.

As shown in Fig. 2, this -Tokyo curved surface 4 is constructed by creating the coordinates of X', Y', and Z' with the vicinity of the center of the reflecting mirror as 0', and then creating the coordinates of the parabolic cylinder surface 2 and the x'z' plane. The intersection line 1 with Z'
A single-lobed hyperboloid 4 is formed by rotating it about the axis in the direction indicated by arrow a. Furthermore, when the center of rotation 0' coincides with the center O of the reflecting mirror, the -Tokyo curved surface becomes a conical surface, so hereinafter it is assumed that the one-leaf hyperboloid includes a conical surface. When this -Tokyo curved surface is stopped at an appropriate position, a step is created between it and the lower parabolic cylinder surface, and this becomes the end line p' of the -Tokyo curved surface 4. Therefore, the intersection line 1 can be said to be substantially the end line of the upper parabolic cylinder surface. A single-lobed hyperboloid in terms of profit is any point (a, b, c) on the XYZ coordinates.
It is a hyperboloid that passes through and satisfies the value expressed by the following formula.

X /a +Y /b -Z /c2-1 The optical image of the filament, that is, the state of reflection on the single-lobed hyperboloid 4 thus formed will be explained with reference to FIGS. 3 and 4. The light source used is an example of a C-8/C-814 bulb such as an H4 bulb. First, in FIG. 3, 5 is a running filament, and 6 is a staggered filament. When the running filament 5 is placed near or slightly behind the general focus f of each parabolic cylinder group, the running filament 5 becomes A filament image 5a is obtained on the end line 1' of the parabolic cylindrical surface 2, and a filament pattern 5b is obtained by reflection on the front surface of the reflecting mirror. Since the filament pattern 5b is formed by rotating around the 2' axis, the filament pattern 5b also moves in response to the rotation from the horizontal line) to rotate along the arrow a'.

Moreover, as shown in FIG. 4, when the passing filament 6 is placed in front of the general focal point of the parabolic surface group, a filament image 6a is obtained on the end line of the parabolic cylinder surface, and this is reflected. The filament pattern 6b obtained on the front surface of the reflecting mirror is formed by rotating the conical end line around the zI axis. As the filament pattern 6b rotates, the filament pattern 6b also moves.

A single-lobed hyperboloid 4 having such characteristics is defined as a reflection area A,
When the reflective area B is above the horizontal line H and the reflective area C is below the horizontal line H, the running filament 5
The light distribution pattern when the light is turned on is as shown in FIG. That is, a 14 bulb (halogen bulb) is used as a light source.
When the light source is on or behind the focal point, the left and right sides are reversed with respect to the vertical line V, and the reflective area A formed by the -Tokyo curved surface 4 has a pattern A' on the left side. Patterns B' and C' of other areas B and C are projected.
are located above and below, respectively, forming a light distribution pattern that spreads in the horizontal direction as a pause.

When the passing filament 6 is turned on, the passing filament 6 is inverted vertically with respect to the horizontal line H since it is located in front of the focal point position. Therefore, as shown in FIG.
Pattern A' is formed above the horizontal line H by approximately 15 degrees, and the reflective area B is formed below the horizontal line H.
' is formed. Note that in the reflection area C, there is a hood under the passing filament, and light to this area is blocked, so there is no reflected light.

No matter which filament is lit, the reflection at the reflection area A of the single-lobed hyperboloid 4 will be in a fan-shaped pattern as a whole,
It reflects light with just the right amount of brightness to the areas that require the most amount of light. And, - in the formation of the Tokyo curved surface 4, the boundary with the upper parabolic cylinder surface 2, that is, the end line 1 of the parabolic cylinder surface, is substantially level-free, and there is no occurrence of glare in the passing beam. be.

In the second embodiment shown in Figs. 7 to 10, it is provided symmetrically with respect to the vertical aV of the ``-unilobal hyperboloid 4'', and can be immediately adapted to both left-hand traffic and right-hand traffic. That's what I did.

Note that the means for forming the parabolic cylindrical surface 2 and the -Tokyo curved surface 4 is the first
It is substantially the same as that of the embodiment. In the monolobal hyperboloids 4 provided on the left and right, when the right monolobal hyperboloid is the reflective area A1 and the left monolobal hyperboloid is the reflective area A2, when the traveling filament is turned on, the pattern A' of each area is
,A,,'.

B' and C' gather together to form the light distribution pattern shown in Figure 8, and when the passing filament is turned on, the 9th
The light distribution pattern will be either that shown in the figure or FIG. 10. 9th
The light distribution pattern shown in the figure is for right-hand traffic, and only patterns A' and B' of reflective areas A and B occur, and reflective areas A2 and C are illuminated by the hood provided at the bottom of the filament for passing each other. It is blocked to prevent reflected light from occurring. Conversely, FIG. 10 shows a light distribution pattern for left-hand traffic, with reflective areas A2. A pattern A2'B' of B is generated, and patterns due to reflection in other areas are not generated.

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 -Tokyo curved surface is located at a symmetrical position, there is 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 single-lobed hyperboloid is used to concentrate strong light in the center of the traveling beam. In other words, the -Tokyo curved surface 4 may be formed wider below the horizontal line H, which is not used as a reflective area for the passing filament. - As described in the first embodiment, the Tokyo curved surface 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 both sides below the horizontal line H are formed as a single-lobed hyperboloid 4, leaving a parabolic cylinder surface 2' near the middle. Then, looking at the light distribution pattern, the reflective area on the conical surface 4 is divided into A, A2 and A3, and the reflective area above the horizontal line H is set to 8, and the lower part is set as C. In this case, the light distribution pattern becomes as shown in FIG. 12, and the reflection area A1. The patterns A, ', A2' of A2 condense light in the central part, and the condensed part partially overlaps the horizontal line H, forming a sheath surrounding with high illuminance in the central part.

Also, when the filament for passing is turned on, the first
As shown in Figure 3, for example, when driving on the right side, the reflection area A2 formed by the single-lobed hyperboloid 4 on the left side is almost blocked, and a part of the reflection area A1 on the right side and the reflection area A3 are diagonally 15 degrees. By forming patterns A' and A', an ideal light distribution pattern for the passing beam can be obtained.

In any of the examples, the -Tokyo curved surface is formed by rotating the parabolic cylindrical surface around the Z' axis in the x'z' plane, so it is continuous with the parabolic cylindrical surface with almost no step difference. Due to the formation of filaments that pass each other when lit,
There is no glare caused by the difference in level.

〔Effect of the invention〕

As explained above, the composite anti-l)l mirror for headlamps according to the present invention has a one-lobed hyperboloid formed on a part of the reflecting surface formed by a large number of parabolic cylindrical surfaces, so that the reflection of the conical surface is improved. The area can be effectively used as a light distribution pattern with a 15° inclination in passing beams, and since the conical surface is continuous with no step between it and the parabolic cylinder surface, there is not only no glare light generation, but also a 15° tilted light distribution pattern. ° A light distribution pattern with no breaks in the upper part can be obtained, and at the same time, it has various excellent effects such as making molding thereof easier.

Further, by providing the -Tokyo curved surface symmetrically, an excellent effect can be achieved in that it can be used for both left-hand traffic and right-hand traffic.

Furthermore, by forming the Tokyo curved surface in most of the positions where the light of the passing filament is not reflected, the light is focused in the center when the running filament is turned on, making it possible to see far away in the case of distant illumination. It is also effective.

[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 single-lobed hyperboloid in the same embodiment, and FIG. 3 is an illustration of the same embodiment. FIG. 4 is an explanatory diagram for explaining the reflection situation of the running filament on the one-leaf hyperboloid surface in the same embodiment, FIG. 6 is a light distribution pattern diagram of a passing beam of the same embodiment, FIG. 7 is a front view showing a composite reflector of a second embodiment of the present invention, Fig. 8 is a diagram of the light distribution pattern of the driving beam of the same embodiment, Fig. 9 is a diagram of the light distribution pattern of the passing beam in the case of right-hand traffic in the same embodiment, and Fig. 10 is a diagram of the light distribution pattern of the passing beam in the case of left-hand traffic. Light pattern diagrams, FIG. 11 is a front view showing a composite reflector of the third embodiment of the present invention, FIG. 12 is a light distribution pattern diagram of the traveling beam of the same embodiment, and FIG. 13 is a cross-sectional view of the same embodiment. A diagram of the light distribution pattern of the beam, Fig. 14 is a front view of a conventional composite reflecting mirror, Fig. 15 is a cross-sectional view taken along line XV7XV in Fig. 14 when a lens is attached to the same reflecting mirror, and Fig. 16 is a FIG. 7 is a diagram of a light distribution pattern of a passing beam in a conventional example. 1... Composite reflection 1 2.2'... Parabolic cylinder surface 3
...Light source mounting position 114...-Tokyo curved surface 5...Filament for running 6...Filament for passing each other H...Horizontal line V...Vertical line Patent applicant Stanley Electric Co., Ltd. Iron size taste

Claims (3)

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