JP2018063895A - Vehicular headlight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular headlight capable of enhancing the freedom of arrangement of a light source.SOLUTION: A vehicular headlight 1 includes: a first light source 40 for emitting first light Lwhich serves as light for low beam; a second light source 50 for emitting second light Lwhich serves as light for high beam; a first reflector 60 having a reflection surface 60s for reflecting at least one part of the first light Lfrontward as the light for low beam, and for reflecting at least one part of the second light Lfrontward as the light for high beam; and a second reflector 70 having a reflection surface 70s for reflecting the second light Lemitted from the second light source 50 so that at least one part of the second light Lemitted from the second light source 50 goes toward the reflection surface 60s of the first reflector 60 after being condensed at a predetermined light condensing point P.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle headlamp.

  2. Description of the Related Art Vehicle headlamps typified by automobile headlights are known in which a low beam light source that illuminates the front at night and a high beam light source that illuminates far away from the low beam are mounted. The light from the high beam light source includes light that is irradiated upward from the low beam. There is a vehicle headlamp in which these light sources are provided in one lamp unit.

  For example, in the following Patent Document 1, a reflector having a parabolic columnar reflecting surface formed by extending a parabola in the width direction, a low beam LED (Light Emitting Diode) arranged in the front-rear direction above the reflector, and a high beam And an automotive lamp comprising the LED. More specifically, an automotive lamp is disclosed that can form a light distribution in which LEDs arranged in the front-rear direction overlap each other.

Japanese Patent Laying-Open No. 2015-185232

  By the way, in order for the low beam light distribution and the high beam light distribution to overlap each other, it is desirable that the low beam LED and the high beam LED be close to each other within a certain range. However, there is a concern that the low-beam LED and the high-beam LED cannot be arranged within a certain range in accordance with a design change or the like in the automotive lamp, and the light distribution that overlaps each other cannot be formed. For this reason, it is required to increase the degree to which the arrangement position of the light source can be changed (the degree of freedom of arrangement of the light source).

  Therefore, the present invention seeks to provide a vehicle headlamp that can increase the degree of freedom of light source arrangement.

  In order to solve the above-described problems, a vehicle headlamp according to the present invention includes a first light source that emits first light that is low-beam light, and a second light source that emits second light that is high-beam light. A light source and a reflection surface that reflects at least part of the first light forward as the low beam light and reflects at least part of the second light forward as the high beam light. One reflector and at least a part of the second light emitted from the second light source are emitted from the second light source so as to be directed to the reflecting surface of the first reflector after being condensed at a predetermined condensing point. And a second reflector having a reflecting surface for reflecting the second light.

  In the above vehicle headlamp, the second light reflected by the reflecting surface of the second reflector is condensed and then propagates toward the reflecting surface of the first reflector. Therefore, the condensing point is a pseudo second light source. Can be considered. Therefore, even if the first light source and the second light source are physically separated, a condensing point that can be regarded as a pseudo second light source can be set in the vicinity of the first light source by the second reflector. As a result, the first light source and the second light can increase the degree of freedom in arrangement of the first light source and the second light source while forming a light distribution that overlaps with each other.

  In the vehicle headlamp described above, it is preferable that a part of the second light emitted from the second light source that is not reflected by the reflecting surface of the second reflector passes through the condensing point.

  In this case, out of the second light emitted from the second light source, the light reflected by the reflecting surface of the second reflector and directed to the condensing point, and the light that does not reflect by the reflecting surface and enters the condensing point. The going light can be reflected as high beam light by the reflecting surface of the first reflector. Therefore, it is possible to improve the efficiency of emission as high beam light.

  Moreover, it is preferable that the said 2nd reflector is arrange | positioned ahead of the said 2nd light source.

  In this case, unnecessary light out of the high beam light can be blocked by the second reflector, and emission of the unnecessary light from the front can be suppressed.

  As described above, according to the present invention, a vehicle headlamp that can increase the degree of freedom of arrangement of light sources is provided.

It is a front view showing an outline of a vehicle provided with a headlight for vehicles in an embodiment of the present invention. It is sectional drawing of the lamp in the II-II line | wire of FIG. It is a figure which shows light distribution. It is sectional drawing which shows the modification from which a part of lamp was changed in the same viewpoint as FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the vehicle headlamp which concerns on this invention is illustrated with an accompanying drawing. The embodiments exemplified below are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the spirit of the present invention.

  First, the configuration of the vehicle headlamp according to the present embodiment will be described.

  FIG. 1 is a front view showing an outline of a vehicle provided with a vehicle headlamp in the present embodiment. As shown in FIG. 1, the vehicle 100 includes a pair of vehicle headlamps in each of the front left and right directions. That is, each of the vehicle headlamps 1 is disposed outside the center of the vehicle 100 in the left-right direction. In addition, the pair of vehicle headlamps 1 provided in the vehicle 100 are symmetrical to each other in the left-right direction. The vehicle headlamp 1 of this embodiment includes lamps 1a, 1b, and 1c, the lamp 1a is disposed on the outermost side of the vehicle 100, the lamp 1c is disposed on the most central side of the vehicle 100, and the lamp 1b is a lamp. It arrange | positions between 1a and the lamp 1c. The respective lamps 1a, 1b, and 1c have the same configuration except that the light distribution is appropriately adjusted as described later.

  2 is a cross-sectional view of the lamp along the line II-II in FIG. As shown in FIG. 2, the lamp 1 a which is a part of the vehicle headlamp 1 includes a housing 10 and a lamp unit LU accommodated in the housing 10.

  The housing 10 includes a lamp housing 11, a front cover 12, and a back cover 13 as main components. The front of the lamp housing 11 is open, and the front cover 12 is fixed to the lamp housing 11 so as to close the opening. In addition, an opening smaller than the front is formed at the rear of the lamp housing 11, and the back cover 13 is fixed to the lamp housing 11 so as to close the opening.

  A space formed by the lamp housing 11, the front cover 12 that closes the front opening of the lamp housing 11, and the back cover 13 that closes the rear opening of the lamp housing 11 is a lamp chamber LR. A lamp unit LU is accommodated therein.

  The lamp unit LU includes a support member 30, a first light source 40, a second light source 50, a first reflector 60, and a second reflector 70 as main components.

  The support member 30 is a metal member, and includes a top plate 31, a back plate 32, and a locking portion 33. The top plate 31 is a metal member constituted by a plate-like first plate 31A extending substantially horizontally and a plate-like second plate 31B extending substantially vertically, and the back plate 32 extends substantially vertically. It is a plate-shaped metal member. A front end of the first plate 31A in the top plate 31 is connected to a rear end of the second plate 31B, and a rear end of the first plate 31A is connected to one front side of the back plate 32. Further, a locking portion 33 is connected to the upper end portion on the rear surface side of the back plate 32. The locking portion 33 extends rearward from the back plate 32, and the locking portion 33 is formed with a screw hole that opens rearward. A screw 22 is screwed into the screw hole from the outside of the lamp housing 11, and a locking portion 33 is fixed to the lamp housing 11. A screw hole is also formed below the back plate 32, and a screw 23 is screwed into the screw hole from the outside of the lamp housing 11, and the back plate 32 is fixed to the lamp housing 11. Thus, the back plate 32 is fixed in the lamp chamber LR in a substantially vertical state, and the top plate 31 connected to the back plate 32 is also fixed in the lamp chamber LR. In addition, by adjusting these screws 22 and 23, the angle of the back plate 32 can be finely adjusted, and accordingly, the angle of the top plate 31 can be finely adjusted.

The first light source 40 is a light source for emitting a first light L ₁ which is a light for low beam. In the present embodiment, the first light source 40 is disposed on the lower surface of the first plate 31A of the top plate 31, it is emitted toward the first light L ₁ downward. Such a first light source 40 is, for example, an LED (Light Emitting Diode). The first light source 40 is connected to a circuit board (not shown), to emit a first light L ₁ by being powered from the circuit board to the lighting period of the low beam. At least a part of the _first light L ₁ emitted from the first light source 40 is reflected forward by the reflecting surface 60 s of the first reflector 60 as low beam light. The light emitted from the first light source 40 and reflected by the reflecting surface 60s of the first reflector 60 passes through the front cover 12 and is emitted from the front cover 12 as low-beam light.

The second light source 50 is a light source for emitting a second light L ₂ to be light for high beam. In the present embodiment, the second light source 50 is disposed further forward than the first light source 40 emits toward the second light L ₂ forward. Such a second light source 50 is, for example, an LED. Incidentally, the second light source 50 is connected to a circuit board (not shown), for emitting a second light L ₂ by being powered from the circuit board to the lighting period of the high beam. Second at least part of the light _{L 2} emitted from the second light source 50 is reflected toward the reflecting surface 60s of the first reflector 60 with reflective surface 70s of the second reflector 70, then, the first reflector 60 The light is reflected forward by the reflecting surface 60s as high beam light. The light emitted from the second light source 50 and reflected by the reflecting surface 60s of the first reflector 60 is transmitted through the front cover 12 and emitted from the front cover 12 as high beam light.

The first reflector 60, as well to reflect forward the first at least part of the light L ₁ as light for low beam, reflection surface for reflecting forward a second at least part of the light L ₂ as light for high beam 60s. In the present embodiment, the reflecting member 62 is provided on the front surface of the first reflector 60, and the surface of the reflecting member 62 is the reflecting surface 60s.

  The reflecting surface 60s has, for example, a concave shape composed of a free curved surface based on a parabola whose opening direction is the front. More specifically, the shape of the reflecting surface 60s in the vertical section is a shape below the apex when the central axis of the parabola is horizontal, and the shape of the reflecting surface 60s in the horizontal section is a parabola. The shape includes the vertices. However, the parabola in the vertical cross section of the reflective surface 60s and the parabola in the horizontal cross section may be different from each other, and the shape of the reflective surface 60s in the horizontal cross section may not be based on the parabola. .

  In the present embodiment, such a first reflector 60 is provided on the lower surface side of the first plate 31 </ b> A in the top plate 31. More specifically, the upper end of the first reflector 60 is fixed to the rear position of the first light source 40 on the lower surface of the first plate 31A, and the first reflector 60 hangs from the fixed portion toward the front position. Moreover, the 1st reflector 60 is curving so that the front surface of the 1st reflector 60 may become inside. Note that the structure and material of the first reflector 60 are not particularly limited as long as it is a member that reflects light on the reflection surface 60s. For example, the 1st reflector 60 which provided the reflecting member 62 by which the mirror surface process by metal vapor deposition etc. was made to the reflector main body which consists of resin or a metal can be employ | adopted.

The second reflector 70 has a reflecting surface 70 s that reflects the second light L ₂ emitted from the second light source 50. In the present embodiment, the reflecting member 72 is provided on the rear surface of the second reflector 70, and the surface of the reflecting member 72 is the reflecting surface 70s.

In the reflecting surface 70s, and the reflected toward the reflecting surface 60s of the first reflector 60 after the second at least part of the light L ₂ emitted from the second light source 50 is condensed into a predetermined converging point P . For example, the reflecting surface 70 s has a concave shape formed of a free-form surface based on a parabola, and the focal point of the parabola is located forward and below the first light source 40 and behind the second light source 50. The focal point of the parabola is the condensing point P, but the focal position may not be in front of the first light source 40, may not be lower than the first light source 40, and is more than the second light source 50. It doesn't have to be backward. However, it is preferable that the condensing point P is in the vicinity of the first light source 40.

  In the present embodiment, such a second reflector 70 is provided on the front surface side of the second plate 31 </ b> B in the top plate 31. More specifically, the upper end of the second reflector 70 is fixed at a position above the second light source 50 on the front surface of the second plate 31B, and the second reflector 70 hangs down from the fixed portion toward the front position. . Further, the second reflector 70 is curved so that the rear surface of the second reflector 70 is inside, and the second light source 50 is covered by the second reflector 70 when the front cover 12 is viewed from the front. Note that the structure and material of the second reflector 70 are not particularly limited as long as it is a member that reflects light on the reflecting surface 70s. For example, similarly to the first reflector 60, a second reflector 70 in which a reflecting member 72, which is mirror-finished by metal deposition or the like, is provided on a reflector body made of resin or metal.

  The lamp 1a is configured as described above. The lamps 1b and 1c have the same configuration except that the light distribution of the low beam and the high beam is different from that of the lamp 1a by appropriately adjusting the shape of the reflection surface 60s of the first reflector 60 and the like.

In the lamp 1a of the present embodiment as described above, the second light L ₂ is reflected by the reflecting surface 70s of the second reflector 70 toward the reflecting surface 60s of the first reflector 60 after collected at the focal point P It is supposed to propagate.

  For this reason, the condensing point P can be regarded as a pseudo second light source. Therefore, even if the first light source 40 and the second light source 50 are physically separated, a condensing point P that can be regarded as a pseudo second light source is set in the vicinity of the first light source 40 by the second reflector 70. can do. As a result, it is possible to increase the degree of freedom in arranging the light sources while forming light distributions that overlap each other.

  Moreover, since the 1st light source 40 and the 2nd light source 50 can be physically separated, the heat radiation amount which one light source receives by light emission of the other light source can be reduced, and the 1st light source 40 and The durability of the second light source 50 can be improved.

Further, the second reflector 70 in the present embodiment is disposed on the front side of the second light source 50. Therefore, the second unnecessary light of the light L ₂ of the high beam emitted from the second light source 50 is blocked by the second reflector 70, it is possible to suppress the said unwanted light is emitted from the front.

  Next, the light distribution by the vehicle headlamp 1 will be described. Since the lamps 1b and 1c have substantially the same configuration as the lamp 1a as described above, description will be made mainly using the lamp 1a.

At least a part of the _first light L ₁ emitted from the first light source 40 in the lamp 1 a is reflected by the reflecting surface 60 s of the first reflector 60 as described above, and is emitted through the front cover 12. In this embodiment, the 1st light source 40 is arrange | positioned on the focus of the parabola which the shape of 60 s of reflective surfaces is based on. Therefore, even if the light emitted from the same region in the emission part of the first light source 40 propagates with a spread angle, even if the light is reflected at different positions on the reflective surface 60s, the reflected light is substantially parallel to each other. The In this way, the first light source 40 in the lamp 1a is turned on to form at least a part of the light distribution of the low beam. The light emitted from the most anterior region in the exit portion of the first of the first light source 40 of the light L ₁ forms a low beam cut line. In this way, the low beam is emitted also from the lamps 1b and 1c, whereby the low beam light distribution shown in FIG. 3A is formed.

At least a part of the _second light L2 emitted from the second light source 50 in the lamp 1a is reflected by the reflecting surface 60s of the first reflector 60 after being reflected by the reflecting surface 70s of the second reflector 70 as described above. The light is emitted through the front cover 12. In this case, at least a portion of the second light L ₂ is reflected upward from the first light L ₁ by the reflective surface 60s. Therefore, the light distribution of the above the said cut line is formed by the second at least part of the light L _2. As described above, at least a part of the light distribution of the high beam is formed by turning on the second light source 50 in the lamp 1a. Further, the light distribution of the first light L ₁ from the light distribution and the first light source 40 by the second light L ₂ from the second light source 50 mate, are high beam light distribution. In this way, the high beams are emitted from the lamps 1b and 1c, whereby the high beam light distribution shown in FIG. 3B is formed.

  During daytime illumination, the first light source 40 or the second light source 50 of at least one of the plurality of lamps 1a, 1b, 1c is turned on, and the shape of the reflecting surface 60s of the lamp is adjusted. The light distribution of daytime illumination shown in FIG. 4 (C) is formed.

  As mentioned above, although the said embodiment was demonstrated to the example about this invention, this invention is not limited to these.

For example, in the above embodiment, as a second at least part of the light L ₂ emitted from the second light source 50 is directed toward the reflective surface of the first reflector 60 60s after converged into a predetermined converging point P, the The second light L ₂ emitted from the second light source 50 was reflected by the reflecting surface 70 s of the second reflector 70. However, as shown in FIG. 4, a part of the second light L ₂ emitted from the second light source 50 that is not reflected by the reflecting surface 70 s of the second reflector 70 passes through the condensing point P. good. If in this manner, the second of the light L ₂ emitted from the second light source 50, the light directed at the focal point P is reflected by the reflecting surface of the second reflector 70 70s, reflected by the reflective surface 70s The light traveling toward the condensing point P without being reflected can be reflected as high beam light by the reflecting surface 60 s of the first reflector 60. Accordingly, it is possible to improve the efficiency of emission from the front cover 12 as high beam light.

In the above embodiment, the first has a first light source 40 for emitting toward the first light L ₁ downward, the reflecting surface 60s for reflecting forward the first light L ₁ as light for low beam 1 A reflector 60 was used. However, for example, a first light source that emits the first light L ₁ upward and a first reflector having a reflection surface that reflects the first light L ₁ forward as low-beam light are employed. May be. When adopting such first light source and the first reflector, a second light source for emitting toward the second light L ₂ backward is employed. Also in this case, as at least part of the second light L ₂ is directed to the reflecting surface of the first reflector after converged to a predetermined focal point, reflecting the second light L ₂ emitted from the second light source A second reflector having a reflecting surface is employed. The front surface of the second reflector is a reflection surface, and the condensing point is located behind the second light source. Thus, the arrangement mode of the first light source, the second light source, the first reflector, and the second reflector is not limited to the above embodiment, and other arrangement modes can be adopted.

  Moreover, in the said embodiment, although the vehicle headlamp shall have three lamps 1a-1c, the number of lamps is not restricted to three, Four or more may be sufficient and two or less may be sufficient. In the above embodiment, the lamps 1a to 1c are arranged in the left-right direction, but the arrangement of the plurality of lamps is not limited to this, and may be arranged in the up-down direction, may be arranged obliquely, or may be U-shaped. You may line up.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle headlamp which can raise the arrangement | positioning freedom degree of a light source is provided, and can be utilized in the field | area of vehicle headlamps, such as a motor vehicle.

DESCRIPTION OF SYMBOLS 1 ... Vehicle headlamps 1a-1c ... Lamp 10 ... Case LU ... Lamp unit 30 ... Support member 31 ... Top plate 32 ... Back plate 40 ... the first light source 50 ... second light source 60 ... first reflector 60s ... reflective surface _L 1 ... first reflecting surface 70 ... second reflector reflector 70s ... second reflector first 1 light L ₂ ... second light

Claims (3)

A first light source that emits first light serving as low-beam light;
A second light source that emits second light to be high beam light;
A first reflector having a reflecting surface that reflects at least a part of the first light forward as the low beam light and reflects at least a part of the second light forward as the high beam light; ,
The second light emitted from the second light source is directed so that at least a part of the second light emitted from the second light source is directed to the reflecting surface of the first reflector after being condensed at a predetermined condensing point. A vehicular headlamp comprising a second reflector having a reflecting surface for reflecting light. 2. The vehicle headlamp according to claim 1, wherein a part of the second light emitted from the second light source that is not reflected by a reflecting surface of the second reflector passes through the condensing point. light. The vehicle headlamp according to claim 1, wherein the second reflector is disposed in front of the second light source.

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