JP2010277699A - Headlight for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headlight for a vehicle capable of securing wide light distribution while effectively utilizing a light source volume. <P>SOLUTION: For the headlight 1 for a vehicle provided with an LED (light source) 2, a main reflecting plate 3 reflecting light from the LED 2 toward front of the vehicle, and an extension 4 arranged in front of the LED 2 and the main reflecting plate 3 of the vehicle, an elliptical reflecting plate 5 with the vicinity of the LED 2 as a first focus F1, and a nearly parabolic cylinder reflecting plate 6 with a second focus F2 of the elliptical reflecting plate 5 as a focal point are arranged in opposition at either side of a light axis X of the main reflecting plate 3 at a rear side of the extension 4. Further, the main reflecting plate 3, the elliptical reflecting plate 4 and the nearly parabolic cylinder reflecting plate 6 are integrally molded. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle headlamp such as a headlight including a light source, a main reflector, and an extension.

  Headlights such as headlights for night illumination are provided on the front left and right of a vehicle such as a passenger car, an example of which is shown in FIG.

  That is, FIG. 5 is a plan sectional view of a conventional vehicle headlamp. The illustrated vehicle headlamp 101 is a headlight provided on the left side of the front of the vehicle, and includes a light source 102 and the light source 102. And a light source 102 and an extension 104 disposed in front of the reflector 103. The front surface of each of the light source 102 and the reflector 103 is a lens. 107. Although not shown, the headlight 101 provided on the right side of the front portion of the vehicle is configured symmetrically with respect to the left headlight 101, and the basic configuration of both is completely the same.

  In such a headlight 101, a reflector 103 capable of diffusing light from the light source 102 is used for the reflector 103 so that a wide light distribution can be obtained with respect to the plate road surface. The reflecting surface of the reflector 103 is generally a parabola whose longitudinal section is substantially parabola, straight or large in cross section, or a strip-shaped substantially parabolic column in which they are continuous. There may be a case where it is composed of a single surface, or a case where several steps are formed on the side and a plurality of reflecting surfaces are combined in the vertical direction.

  By the way, regarding vehicle lamps including headlights, various signal lamps, cornering lamps, and the like, various proposals have been made in Patent Documents 1 to 3, for example.

JP 2005-038846 A JP 2003-031007 A JP 2009-048898 A

  When a reflecting surface for diffusing light from the light source 102 is set on the reflector 103 as in the conventional headlight 101 shown in FIG. 5, an extension 104 for improving the appearance is usually arranged in front of the light source 102. For this reason, the size of the front opening of the reflecting surface of the reflector 103 is limited by the extension 104, and the extensions L1 ′ and L2 ′ shown in FIG. 5 out of the light emitted from the light source 102 and reflected by the reflecting surface of the reflector 103. There is light that is blocked by 104 and cannot go forward. For this reason, there is a problem that desired diffused light cannot be obtained and the amount of light of the light source 102 cannot be used effectively.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicular headlamp that can ensure a wide light distribution while effectively using the light amount of a light source.

  In order to achieve the above object, an invention according to claim 1 is provided with a light source, a main reflection plate that reflects light from the light source toward the front of the vehicle, and the light source and the main reflection plate arranged in front of the vehicle. In a vehicle headlamp having an extension, an elliptical reflector having a focal point in the vicinity of the light source and a substantially parabolic reflector having a second focal point of the elliptical reflector are disposed on the back side of the extension. And arranged opposite to both sides of the optical axis of the main reflector.

  According to a second aspect of the present invention, in the first aspect of the present invention, the second focal point of the elliptical reflecting plate is 10 mm or less forward and 10 mm or less lower than the first focal point in the optical axis direction of the main reflecting plate. The line segment connecting the first focal point and the second focal point is 45 ° or less with respect to the axial direction perpendicular to the optical axis of the main reflecting plate. It is set to form an angle.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the angle of the optical axis of the substantially parabolic reflector at the second focal point is 45 ° or more with respect to the optical axis of the main reflector. It is characterized by setting.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the main reflector, the elliptic reflector, and the substantially parabolic reflector are integrally formed.

  According to the first to third aspects of the present invention, even if the size of the front opening of the main reflecting plate is limited by the extension, the conventional light out of the light reflected from the main reflecting plate from the light source is conventionally used. The light that is blocked by the extension and cannot go forward is reflected by an elliptical reflector having a first focal point in the vicinity of the light source, and then a substantially parabolic column having the second focal point of the elliptical reflector. The light is reflected by the reflecting plate, passes through the area surrounded by the extension as parallel light, and is irradiated to the front of the vehicle for illumination of the road surface. For this reason, the light conventionally blocked by the extension can also be used as illumination light, and a wide light distribution can be ensured while effectively using the light amount of the light source. In this case, since the elliptical reflector and the substantially parabolic reflector are arranged behind the extension and cannot be seen from the front, the elliptical reflector and the substantially parabolic reflector reflect the appearance of the vehicle headlamp. Will not be damaged.

  According to the invention of claim 4, since the main reflector, the elliptic reflector, and the substantially parabolic reflector are integrally molded, there is no misalignment between them after incorporation, and each positioning is accurately performed. Made.

1 is a perspective view of a main part of a vehicle headlamp according to the present invention. 1 is a cross-sectional plan view of a vehicle headlamp according to the present invention. It is a figure which shows the positional relationship with respect to the optical axis of the 1st focus of the vehicle headlamp which concerns on this invention, and a 2nd focus with respect to the optical axis, (a) is a top view, (b) is a rear view. . (A) is a figure which shows the light distribution pattern of the vehicle headlamp of the left side (L side), (b) is a figure which shows the light distribution pattern of the vehicle headlamp of the right side (R side). It is a plane sectional view of the conventional vehicle headlamp.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a main part of a vehicle headlamp according to the present invention, FIG. 2 is a plan sectional view of the vehicle headlamp, and FIG. 3 is a first focus and a second focus of the vehicle headlamp. It is a figure which shows the positional relationship with respect to the optical axis of a main reflector, Comprising: (a) is a top view, (b) is a rear view, Fig.4 (a) is light distribution of the vehicle headlamp of the left side (L side). FIG. 4B is a diagram showing a light distribution pattern of a vehicle headlamp on the right side (R side).

  A vehicle headlamp 1 shown in FIGS. 1 and 2 is a headlight disposed on the left side of the front of the vehicle, and includes an LED 2 as a light source and light from the LED 2 in front of the vehicle (upward in FIG. 2). A main reflection plate 3 that reflects toward the vehicle, a frame-like extension 4 disposed in front of the LED 2 and the main reflection plate 3, and an elliptical reflection plate 5 that is arranged opposite to the left and right of the back side of the extension 4. And a substantially parabolic reflector 6, and these front surfaces are covered with a transparent lens 7. Although not shown, the headlight 1 provided on the right side of the front portion of the vehicle is configured symmetrically with respect to the left side (L side) headlight 1, and the basic configuration of both is exactly the same. The illustration and description of the headlight on the side) are omitted.

  Here, the main reflecting plate 3 has a reflecting surface for diffusing the light from the LED 2 and irradiating it forward of the vehicle so as to obtain a wide light distribution on the road surface. The vertical cross section is a substantially parabola, and the horizontal cross section is a straight or large R shape or a strip-shaped substantially parabolic column in which they are continuous. In the present embodiment, the LED 2 is used as the light source, but any other lamp such as a halogen lamp or a discharge lamp (HID) can be used instead.

  By the way, the elliptical reflector 5 and the substantially parabolic reflector 6 are on the back side of the extension 4 as described above, and on both sides of the optical axis X of the main reflector 3 and the substantially parabolic reflector 5. The column reflecting plate 6 is disposed to face each other. Specifically, the elliptical reflecting plate 5 has an elliptical reflecting surface 6 in which the vicinity of the LED 2 has a first focal point F1 and the vicinity of the substantially parabolic reflecting plate 6 has a second focal point F2. Arranged on the left side of the axis X. On the other hand, the substantially parabolic reflector 6 has a substantially parabolic reflecting surface with the second focal point F2 of the elliptical reflector 5 as the focal point, and the optical axis X of the main reflector 3 has an optical axis X. Arranged on the right side. In the present embodiment, the main reflector 3, the elliptic reflector 5, and the substantially parabolic reflector 6 are formed by integral molding. Although not shown, in the right side (R side) headlight 1, the elliptical reflector 5 and the substantially parabolic reflector 6 are arranged in the left and right direction opposite to the left side (L side) headlight 1. The elliptical reflector 5 is disposed on the right side of the optical axis X of the main reflector 3, and the substantially parabolic reflector 6 is disposed on the right side of the optical axis X of the main reflector 3.

  Here, the positional relationship between the first focal point F1 and the second focal point F2 of the elliptical reflecting plate 5 with respect to the optical axis X of the main reflecting plate 3 will be described with reference to FIGS.

  The second focal point F2 of the elliptical reflecting plate 5 is 10 mm or less in front of the main reflecting plate 3 in the optical axis X direction (above FIG. 3A) and below (below in FIG. 3B) with respect to the first focal point F1. ) 10 mm or more and at a position 25 mm or more away in the direction orthogonal to the optical axis X of the main reflector 3 (right side in FIG. 3A).

  3A, the line segment M connecting the first focal point F1 and the second focal point F2 of the elliptical reflecting plate 5 is 45 ° with respect to the axial direction perpendicular to the optical axis X of the main reflecting plate 3. The position of the second focal point F2 is set so as to form the following angle α. Furthermore, the installation angle of the substantially parabolic reflector 6 so that the angle β of the optical axis Y of the substantially parabolic reflector 6 at the second focal point F2 is 45 ° or more with respect to the optical axis X of the main reflector 3. Is set.

  Thus, when the LED 2 of the headlight 1 is energized at night and the LED 2 emits light, most of the light is substantially parabolic reflecting surface of the main reflector 3 as indicated by L in FIG. 4, diffused light passes through the area surrounded by the extension 4 and is irradiated to the front of the vehicle as main reflected light, and the vehicle has a wide main light distribution pattern indicated by A in FIG. Illuminate the road ahead.

  By the way, in the headlight 1 according to the present embodiment, the size of the front opening of the main reflector 3 is limited by the extension 4, but even in such a case, the main reflector comes out of the LED 2. As shown in FIG. 2, the light that is conventionally blocked by the extension 4 and cannot be emitted forward is reflected by the elliptical reflector 5 having the first focus F1 in the vicinity of the LED 2 as shown in FIG. After the reflection, the light is reflected by the substantially parabolic reflector 6 focusing on the second focal point F2 of the elliptical reflector 5 and passes through the region surrounded by the extension 4 as the parallel light L1 while crossing the main reflected light. Then, it is irradiated toward the front of the vehicle in an obliquely leftward direction (an angle of 30 ° to 60 ° in the vehicle left outer direction) to be used for lighting the road surface.

  Accordingly, in the left side (L side) headlight 1, a light distribution pattern indicated by B is added to the left outer side of the main light distribution pattern indicated by A as shown in FIG. Since the left outer side of the irradiation range of the main reflected light is irradiated, a wider light distribution than the conventional one can be ensured.

  In the right (R side) headlight 1 (not shown), an elliptical reflector 5 arranged on the right side of the optical axis X of the main reflector 3 and a substantially parabolic reflection reflected on the left side of the optical axis X. The light reflected by the plate 6 passes through the area surrounded by the extension 4 as parallel light while crossing with the main reflected light, and is obliquely rightward toward the front of the vehicle (an angle of 30 ° to 60 ° toward the vehicle right outer side). ) To be used for road illumination. As a result, as shown in FIG. 4B, the light distribution pattern indicated by B ′ is added to the right outside of the main light distribution pattern indicated by A ′, and the right outside of the irradiation range of the main reflected light. Therefore, a wider light distribution than conventional can be ensured.

  As described above, according to the present embodiment, by arranging the elliptical reflector 5 and the substantially parabolic reflector 6 on the back side of the extension 4 of the headlight 1, the light conventionally blocked by the extension 4 can be obtained. Since it can also be used as illumination light, it is possible to obtain an effect that a wide light distribution can be ensured while effectively using the light quantity of the LED 2 that is a light source. In this case, the elliptical reflector 5 and the substantially parabolic reflector 6 are disposed on the back side of the extension 4 and are not visible from the front. The appearance of is not impaired.

  In the present embodiment, since the main reflector 3, the elliptic reflector 5 and the substantially parabolic reflector 6 are integrally molded, there is no misalignment between them after the incorporation, and each positioning is accurate. The effect of being made is also obtained.

  In the above embodiment, the embodiment in which the present invention is applied to the headlight has been described. However, the present invention is similarly applied to any other vehicle headlamp having an extension. Is possible. In the above embodiment, the reflection type is described as the main reflection. However, the projector type is used for the main reflection, and the light reflected by the substantially parabolic reflector is emitted from a place where the projector lamp does not disturb. You may make it let it.

1 Headlight (vehicle headlamp)
2 LED (light source)
3 Main reflector 4 Extension 5 Elliptical reflector 6 Substantially parabolic reflector 7 Lens F1 First focal point of elliptical reflector F2 Second focal point of elliptical reflector L, L1 Light M Line connecting first focal point and second focal point Min X Optical axis of main reflector Y Optical axis of parabolic reflector

Claims (4)

In a vehicle headlamp comprising a light source, a main reflector that reflects light from the light source toward the front of the vehicle, and an extension that is disposed in front of the vehicle of the light source and the main reflector,
An elliptical reflector having a first focus near the light source and a substantially parabolic reflector having a second focus of the elliptical reflector are on the back side of the extension, and the main reflector A vehicular headlamp characterized by being arranged opposite to each other on both sides of an optical axis.   The second focal point of the elliptical reflector is positioned 10 mm or less forward of the main reflector in the optical axis direction, 10 mm or more downward, and 25 mm or more away from the first focal point in a direction perpendicular to the optical axis of the main reflector. 2. The apparatus according to claim 1, wherein the line segment connecting the first focal point and the second focal point is set to form an angle of 45 ° or less with respect to an axial direction perpendicular to the optical axis of the main reflector. Vehicle headlamp.   The vehicle headlamp according to claim 1 or 2, wherein an angle of an optical axis of the substantially parabolic reflector at the second focal point is set to 45 ° or more with respect to an optical axis of the main reflector. light.   The vehicle headlamp according to any one of claims 1 to 3, wherein the main reflector, the elliptic reflector, and the substantially parabolic reflector are integrally molded.

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