JP2011187259A - Headlight for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headlight for a vehicle easily changeable in light distribution compared with the prior art. <P>SOLUTION: The headlight 1 for the vehicle includes a reflector 5 with a reflecting surface 51 opened to the vehicle front and divided in a plurality of reflecting regions 510. Light from filaments 41 of a bulb 4 is reflected by each reflecting region 510 of the reflecting surface 51 and transmitted through a transparent light-transmitting cover 3 to irradiate the vehicle front. Second reflecting regions 510b out of the reflecting regions 510 are formed in concentrically laminated shape of a plurality of rectangular surfaces S different from one another in at least one length out of vertical and lateral lengths such that the rectangular surfaces S are arranged closer to the front side of the reflecting surface 51 the smaller the areas are. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle headlamp.

  2. Description of the Related Art Conventionally, a vehicle headlamp that irradiates light through a transparent translucent cover that is not formed with a lens cut is known. In such a vehicle headlamp, a predetermined light distribution is obtained by reflecting light from a light source toward a translucent cover by a so-called multi-reflector formed with a multi-surface reflecting surface having a light distribution control function. (For example, refer to Patent Documents 1 and 2).

FIG. 8 is a front view of such a multi-reflector, and FIG. 9 is a side sectional view.
As shown in these drawings, the conventional multi-reflector 100 has a reflecting surface 101 based on a rotating paraboloid, and a light source 200 is disposed at a substantially focal position of the reflecting surface 101. The reflection surface 101 is divided into a plurality of reflection regions 101a,... And each of the reflection regions 101a reflects light from the light source 200 to an individual region, whereby a predetermined light distribution as the entire reflection surface 101 is obtained. Pattern formation is realized.
Here, each reflective region 101a has a parabolic column surface whose width is narrowed so that the radius of curvature in the horizontal section is small in order to form a light distribution pattern that spreads in the left-right direction, that is, a long surface in the vertical direction. It is formed in a parabolic columnar shape. Moreover, each reflective area | region 101a has mutually different F value, and is a mutually different surface.

JP-A-6-251603 JP-A-7-45101

By the way, as shown in FIG. 9, the light emitted from the light source 200 forms a smaller projected image as it is reflected at a position spaced apart from the light source 200 in the vertical direction in the multi-reflector 100.
For this reason, in the conventional multi-reflector 100 in which each reflection region 101a is formed to be long in the vertical direction, the size of the projection image changes depending on the reflection position in the reflection region 101a, but the projection image by each reflection region 101a. Since the position (projection direction) becomes substantially constant, it is difficult to change the light distribution.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicular headlamp that can easily change the light distribution compared to the related art.

In order to solve the above-described problem, the invention according to claim 1 includes a reflector in which a reflection surface opened forward of the vehicle is divided into a plurality of reflection regions, and the light from the light source is transmitted to each reflection region of the reflection surface. In a vehicle headlamp that reflects and transmits through a transparent translucent cover and irradiates the front of the vehicle,
At least one of the plurality of reflection regions is arranged such that a plurality of rectangular surfaces having different lengths in at least one of the vertical direction and the horizontal direction are arranged on the front side of the reflection surface as the area is smaller. Thus, it is formed in the shape laminated | stacked concentrically.

The invention according to claim 2 is the vehicle headlamp according to claim 1,
The plurality of rectangular surfaces have different lengths in the vertical direction and the horizontal direction.

The invention according to claim 3 is the vehicle headlamp according to claim 1 or 2,
The plurality of rectangular surfaces are directly connected in the left-right direction.

  According to the first aspect of the present invention, at least one of the plurality of reflection regions dividing the reflection surface of the reflector (multi-reflector) has a plurality of different lengths in at least one of the vertical direction and the horizontal direction. Since the rectangular surface is formed so as to be concentrically stacked so that the smaller the area is, the at least one of the vertical and horizontal directions of the rectangular surface in the reflective region By changing the length of the light distribution, the light distribution can be changed. Therefore, it is possible to easily change the light distribution as compared with the conventional case in which each reflection region is formed to be long in the vertical direction.

  According to the invention described in claim 2, the plurality of rectangular surfaces are different from each other in length in the vertical direction and the left-right direction, that is, the reflection region having the plurality of rectangular surfaces is divided into ring zones. Therefore, the dividing line that divides the reflecting surface is an element constituting the appearance of the vehicle headlamp through the transparent light-transmitting cover. Since the reflection surface is formed so as to have the reflection area divided into the two, it is possible to make the appearance of a novel design different from the conventional one.

  According to the invention described in claim 3, since the plurality of rectangular surfaces are directly connected in the left-right direction, that is, they are connected in the left-right direction without interposing a stepped portion, the light from the light source is in the left-right direction. It is possible to prevent the occurrence of glare (dazzling) due to the reflected light.

It is a sectional side view of the vehicle headlamp in an embodiment. It is a perspective view of a reflector. It is a figure for demonstrating the structure of a 2nd reflective area | region. It is a section perspective view showing the horizontal section of the 2nd reflective field. It is a section perspective view showing the horizontal section of the 2nd reflective field of another example. It is a figure which shows the example of the light distribution pattern by a reflector. It is a front view of the 2nd reflective field of another example. It is a front view of the conventional multi reflector. It is a sectional side view of the conventional multi-reflector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Configuration of vehicle headlamp>
FIG. 1 is a side sectional view of a vehicle headlamp 1 according to this embodiment.
As shown in this figure, a vehicle headlamp 1 includes a lamp body 2 having a front surface opened toward the front of the vehicle, and a transparent translucent cover 3 arranged so as to cover the front surface opening of the lamp body 2. I have. The lamp chamber formed by the lamp body 2 and the translucent cover 3 accommodates a bulb 4 having a filament 41 and a reflector 5 that reflects light from the filament 41 forward of the vehicle.

FIG. 2 is a perspective view of the reflector 5, and FIG. 3 is a diagram for explaining a configuration of a second reflection region 510 b described later in the reflector 5.
As shown in FIG. 2, the reflector 5 has a concave surface that opens to the front of the vehicle, and the concave surface constitutes a reflective surface 51 that reflects light from the bulb 4. The reflecting surface 51 is a free-form surface based on a rotating paraboloid having a main axis Ax along the front-rear direction, and the filament 41 of the bulb 4 is disposed at a substantially focal position (see FIG. 1). With such a configuration, the light emitted from the filament 41 of the bulb 4 is reflected by the reflecting surface 51, passes through the translucent cover 3, and is irradiated forward of the vehicle.

  The reflector 5 is a so-called multi-reflector in which the reflecting surface 51 is divided into a plurality of reflecting areas 510,..., So that each reflecting area 510 has a light distribution pattern A by the entire reflecting surface 51 (see FIG. 6). ) Is configured to carry out irradiation of a predetermined portion. In the present embodiment, the reflection surface 51 is divided in the left-right direction, and has, as the reflection areas 510,..., A first reflection area 510a and four second reflection areas 510b,. Yes.

  Among these, the first reflection area 510a is further divided into a plurality of small reflection areas 520,... Having different lengths in the vertical direction and the left-right direction, and the plurality of small reflection areas 520,. It is formed in a shape in which one side is matched.

  On the other hand, the second reflection areas 510b,... Are further divided into a plurality of substantially square-shaped small reflection areas 530,... Extending in the vertical direction, and the plurality of small reflection areas 530,. It is formed in a different shape. In other words, as shown in FIG. 3, the second reflection region 510 b,... Has a plurality of rectangular surfaces S,. It is formed in the shape laminated | stacked concentrically so that it may arrange | position on the side. And the part exposed to the surface among each rectangular surface S comprises each small reflective area | region 530. FIG. In each of the second reflective regions 510b, the plurality of rectangular surfaces S,... Are configured so as to form a smaller projected image as the area is smaller, and those having a smaller area in order to facilitate condensing. It has a small F value. In the present embodiment, the four second reflection areas 510b,... Are each composed of two or three small reflection areas 530,.

  Further, in the second reflection areas 510b,..., Each small reflection area 530 (rectangular surface S) is concentric with the vertical position of the filament 41 arranged on the main axis Ax as the center height, as shown in FIG. Is formed. The cross-section (line) shape of each small reflection region 530 at this center height is a shape that greatly affects the light distribution in the left-right direction by the small reflection region 530, and is a linear shape, an arc shape, or a substantially parabolic shape. (See FIG. 4). On the other hand, the cross-sectional (line) shape of each small reflection region 530 in the vertical direction is substantially parabolic. Here, the “substantially parabola” is a free curve based on a parabola.

FIG. 4 is a cross-sectional perspective view showing a horizontal cross section of the second reflection region 510b, and FIG. 5 is a cross-sectional perspective view showing a horizontal cross section of another example of the second reflection region 510b.
As shown in FIG. 4, in the second reflection area 510b, a plurality of small reflection areas 530,... (Rectangular surface S,...) Are directly connected in the left-right direction. That is, the plurality of small reflection regions 530,... Are connected in the left-right direction without interposing a step portion. Specifically, a plurality of small reflection regions 530,... Having different profiles (curvature radii) are connected by lines intersecting with each other, so that the plurality of small reflection regions 530,. ... are connected. Thereby, the light from the filament 41 is not reflected by the step part in the left-right direction, and the occurrence of glare (dazzling) due to the reflected light can be prevented. However, as shown in FIG. 5, if the step surface P is disposed at a position where it becomes a blind spot from the filament 41, a step portion having the step surface P is interposed between the two small reflection regions 530 and 530. May be.

<Action and effect>
According to the vehicle headlamp 1 described above, the second reflective region 510b has a plurality of rectangular surfaces S that are different from each other in the vertical and horizontal directions on the front side of the reflective surface 51 as the area becomes smaller. Since it is formed so as to be concentrically stacked so as to be arranged, the length of at least one of the rectangular surface S (small reflective region 530) in the vertical direction and the horizontal direction is changed in the second reflective region 510b. Thus, for example, as shown in FIGS. 6A to 6C, the light distribution is changed so that the uniformly distributed light distribution pattern A is weakened at the center in the horizontal direction or the vertical direction. can do. Specifically, the light distribution in the vertical direction can be changed by changing the vertical length of the rectangular surface S (small reflection region 530), and the horizontal direction can be changed by changing the horizontal length. The light distribution can be changed. Therefore, it is possible to easily change the light distribution as compared with the conventional case in which each reflection region is formed to be long in the vertical direction.

  The dividing line that divides the reflecting surface 51 is an element that constitutes the appearance of the vehicle headlamp 1 through the transparent translucent cover 3, but is not a reflective region that is long in the vertical direction as in the prior art. Since the reflection surface 51 is formed so as to have the reflection regions 510b divided into ring zones, the appearance of a novel design different from the conventional one can be obtained.

  In addition, since the plurality of small reflection regions 530,... (Rectangular surfaces S,...) Are directly connected in the left-right direction, that is, they are connected without a stepped portion in the left-right direction. Is not reflected by the step portion in the left-right direction, and the occurrence of glare (dazzling) due to the reflected light can be prevented.

  It should be noted that the present invention should not be construed as being limited to the above-described embodiment, and of course can be modified or improved as appropriate.

  For example, in the above embodiment, four second reflection regions 510b are formed. However, the present invention is not limited to this, and at least one second reflection region 510b is sufficient.

In addition, the second reflection regions 510b, ... are formed in a shape in which a plurality of rectangular surfaces S having different lengths in the vertical direction and the left-right direction are stacked, but the plurality of rectangular surfaces S are It is sufficient that at least one of the vertical direction and the horizontal direction has a different length.
Here, for example, as shown in FIGS. 7A and 7B, the second reflective region 510b is composed of two rectangular surfaces S1 and S2 that differ only in the length of either the vertical direction or the horizontal direction. In this case, three small reflection areas 530 are formed, which are the small reflection area 530a that is the rectangular surface S1 and the two small reflection areas 530b and 530c that are part of the rectangular surface S2.

  In addition, although two or three small reflection regions 530 are formed in the second reflection region 510b, the number of the small reflection regions 530 is not particularly limited as long as the number is small, and a desired collection can be achieved. It can be set as appropriate according to the degree of light. For example, when it is desired to increase the degree of light collection in the second reflection region 510b and increase the reflected light, the number of small reflection regions 530 may be increased.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Lamp body 3 Translucent cover 4 Bulb 41 Filament (light source)
5 Reflector 51 Reflective surface 510 Reflective region 510a First reflective region 510b Second reflective region 520, 530 Small reflective region A Light distribution pattern P Step surface S Rectangular surface

Claims (3)

A reflecting surface that opens to the front of the vehicle is provided with a reflector that is divided into a plurality of reflecting areas, and the light from the light source is reflected by each reflecting area of the reflecting surface, and is transmitted through a transparent light-transmitting cover and irradiated to the front of the vehicle. In vehicle headlamps,
At least one of the plurality of reflection regions is arranged such that a plurality of rectangular surfaces having different lengths in at least one of the vertical direction and the horizontal direction are arranged on the front side of the reflection surface as the area is smaller. As described above, the vehicle headlamp is formed in a concentrically stacked shape.   The vehicle headlamp according to claim 1, wherein the plurality of rectangular surfaces have different lengths in the vertical direction and the horizontal direction.   The vehicular headlamp according to claim 1, wherein the plurality of rectangular surfaces are directly connected in the left-right direction.

Images