JP2013069454A - Headlight unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headlight unit including a left-side and a right-side head lamps inclined backward from the center side toward the lateral sides of a vehicle to form proper low beams.SOLUTION: The left-side head lamp 20 and the right-side head lamp 30 provided in a headlight unit 1 for vehicle include bulbs 22, 32 and reflection surfaces 231, 331 which reflect light emitted from the bulbs 22, 32 frontward. Each reflection surface 231, 331 has a plurality of reflecting regions formed for reflecting light to respective regions corresponding to the left-side head lamp 20 and the right-side head lamp 30. The plurality of reflecting regions include central reflecting regions 231a, 331a close to the bulbs 22, 32, left-side reflecting regions 231b, 331b on the left side, right-side reflecting regions 231c, 331c on the right side, and inside reflecting regions 231d, 331d which are located at centermost side of the vehicle extending to the left-side reflecting region 331b or the right-side reflecting region 231c. The left-side reflecting regions 231b, 331b and the right-side reflecting regions 231c, 331c are equal to each other in their widths or their surface areas along their lateral directions.

Description

  The present invention relates to a vehicle headlamp unit.

  2. Description of the Related Art Conventionally, as a vehicle headlamp such as an automotive headlamp, a light distribution pattern is formed in front of a vehicle by reflecting light emitted from a bulb with a reflector (for example, Patent Document 1). reference).

  As shown in FIGS. 4 (a) and 4 (b), in this type of vehicle headlamp 60, a bulb 80 and a curved plate opening forward are provided in a lamp chamber whose front is covered with an outer lens 70. A reflector 90 is accommodated. The bulb 80 has, for example, two filaments 81 and 82, and these two filaments 81 and 82 are arranged so as to be positioned in the vicinity of the focal point of the reflecting surface 91 formed on the front surface of the reflector 90. The reflecting surface 91 of the reflector 90 includes three reflecting regions 91a, 91b, 91c arranged in parallel in the left-right direction in the upper half and a reflecting region 91d in the lower half.

  When the main filament 81 of the two filaments 81 and 82 is turned on, the light is reflected by all the reflection areas 91a to 91d of the reflection surface 91, and a traveling beam is formed in front of the vehicle. On the other hand, when the sub-line filament 82 of the two filaments 81 and 82 is turned on, the light is reflected by the reflection areas 91a to 91c in the upper half of the reflection surface 91, and is only below the substantially horizontal line. A low beam irradiated with is formed.

  At this time, since the filaments 81 and 82 that are light emitters are long in the front-rear direction, as shown in FIG. 5, the reflection region 91a at the center of the reflection surface 91 located above the bulb 80 is long in the vertical direction. In the reflection areas 91b and 91c located on the side of the bulb 80, many light images that are long in the left-right direction are formed. Specifically, when the passing beam P is formed, the light reflected by the reflection area 91a at the center of the reflection surface 91 is widely distributed in the left-right direction as shown in FIG. The light that forms P1 and is reflected by the reflection region 91b on the left side of the reflection surface 91 is distributed from the vertical line V to the right side in the vicinity of the center, as shown in FIG. The light that forms P2 and is reflected by the reflection area 91c on the right side of the reflection surface 91 is distributed from the right side to the left side of the vertical line V in the vicinity of the center, as shown in FIG. 6C. A light distribution region P3 is formed. Then, light distribution regions P1 to P3 are formed by two vehicle headlights 60 and 60 (left headlight 60L and right headlight 60R) on the left and right sides, which are configured in the same manner. As shown, a passing beam P composed of these light distribution regions P1 to P3 is formed.

JP 11-260114 A

  By the way, in recent vehicle headlamps, as shown in FIG. 8, there is a case where it is formed in a shape inclined rearward from the vehicle center side toward the vehicle side side due to a request in the vehicle body design. In such a vehicle headlamp, in general, the shape of the reflector 90 corresponds to the inclined outer lens 70, and therefore, the portion of the reflecting surface 91 located closer to the vehicle center than the bulb 80 is more. It is wider than the portion located on the side of the vehicle. As a result, the shapes of the reflection area 91b and the reflection area 91c are different from each other between the left headlight 60L and the right headlamp 60R, and consequently the light distribution is different, so that an appropriate passing beam P is formed. Can't make the driver feel uncomfortable.

  The present invention has been made in view of the above circumstances, and includes a left headlight and a right headlight that are inclined rearward from the vehicle central side toward the vehicle side, and includes an appropriate passing beam. An object is to provide a vehicular lamp unit that can be formed.

In order to solve the above-mentioned problem, the invention described in claim 1
A vehicle headlamp that is mounted on the left and right sides of the front part of the vehicle and includes a left headlight and a right headlight that are inclined rearward from the vehicle center toward the vehicle side, and forms a passing beam in front of the vehicle In the unit
The left headlight and the right headlight are:
A valve,
A reflective surface that is formed in a shape that opens forward and is arranged so that the bulb is positioned in the vicinity of the focal point thereof, and reflects light emitted from the bulb forward,
Each with
The reflective surface has a plurality of reflective areas that reflect light toward corresponding areas in the passing beam between the left headlight and the right headlamp.
The plurality of reflective regions are
A central reflective region formed in a position proximate to the bulb;
A left reflective region formed on the left side of the central reflective region;
A right reflective region formed on the right side of the central reflective region;
An inner side reflection region that is continuous with the left side reflection region or the right side reflection region and is formed on the most vehicle center side among the reflection surfaces, and
Including
The left reflective region and the right reflective region have the same width or surface area along the left-right direction.

The invention according to claim 2 is the vehicle headlamp unit according to claim 1,
The reflective surface is characterized in that the focal point is located on the side of the vehicle with respect to the center in the left-right direction of the reflective surface.

The invention according to claim 3 is the vehicle headlamp unit according to claim 1 or 2,
The low beam has a horizontal upper end cut-off line.

The invention according to claim 4 is the vehicle headlamp unit according to any one of claims 1 to 3,
The inner reflection region reflects light toward a region including a high light intensity region near the center in the left-right direction of the passing beam.

According to the present invention, the reflecting surface for reflecting the light emitted from the bulb to the front passes between the left headlight and the right headlight, and reflects the light toward the corresponding region in the beam. It has a plurality of reflection areas, and the plurality of reflection areas are a central reflection area formed at a position close to the bulb, a left reflection area formed on the left side of the central reflection area, and a right side of the central reflection area A right-side reflection area formed on the left-side reflection area or the right-side reflection area, and an inner-side reflection area formed on the most vehicle center side of the reflection surface. However, the width or surface area along the left-right direction is made equal to each other.
In other words, each of the reflective surfaces of the left headlight and the right headlight is provided with an inner reflection region so that the width or surface area along the left-right direction of the left reflection region and the right reflection region is equal to each other. Since these reflecting areas reflect light to the corresponding areas of the left headlight and the right headlight, the same light distribution must be formed by the left headlight and the right headlamp. Can do. Therefore, an appropriate passing beam can be formed even with a left headlight and a right headlight that are inclined rearward from the vehicle center side toward the vehicle side.

It is a front view of the principal part of the vehicle headlamp unit in an embodiment. It is sectional drawing in the II-II line of FIG. It is a figure which shows the passing beam formed by the vehicle headlamp unit in embodiment. It is a figure which shows the conventional vehicle headlamp. It is a figure for demonstrating the optical image of the filament projected by the reflective surface of a reflector. It is a figure which shows the light distribution area | region formed by each reflection area | region of the reflective surface of a reflector. It is a figure which shows the passing beam formed with the conventional vehicle headlamp unit. It is a figure which shows the conventional vehicle headlamp unit inclined backward from the vehicle center side toward the vehicle side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a main part of a vehicle headlamp unit 1 according to this embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to directions viewed from a vehicle (not shown) on which the vehicle headlamp unit 1 is mounted. Shall mean.

  As shown in FIGS. 1 and 2, the vehicle headlamp unit 1 forms a predetermined light distribution pattern in front of the vehicle, and includes a left headlamp 20 mounted on the left side of the front of the vehicle, And a right headlamp 30 mounted on the front right side.

  Among these, the left headlamp 20 includes a housing (not shown) whose front surface is open and an outer lens 21 that covers the front opening of the housing. Among these, the outer lens 21 is inclined backward from the vehicle center side toward the vehicle side side. A bulb 22 and a reflector 23 are accommodated in a lamp chamber formed by the housing and the outer lens 21.

  The bulb 22 is a light source of the left headlamp 20 and has a main-line filament 221 and a sub-line filament 222 which are light emitters (emission centers). Among these, a light shielding cup (not shown) is provided near the lower portion of the sub-line filament 222.

The reflector 23 is formed in a substantially curved plate shape that opens forward, and the bottom surface (front surface) in the opening serves as a reflection surface 231 that reflects light emitted from the bulb 22 forward.
The reflecting surface 231 is a free-form surface based on a paraboloid of revolution, and is arranged so that the filaments 221 and 222 of the bulb 22 are located in the vicinity of the focal point. The focal point of the reflecting surface 231 is located on the side (outside) of the vehicle with respect to the center of the reflecting surface 231 in the left-right direction. That is, the reflecting surface 231 is formed so that the vehicle center side is longer than the vehicle side side from the focal point so as to correspond to the inclination of the outer lens 21.

  The reflection surface 231 is composed of a plurality of reflection regions that reflect light to different regions. Specifically, the reflection surface 231 has a central reflection region 231a formed at a position closest to the bulb 22 at a substantially upper half portion thereof, a left reflection region 231b formed on the left side of the central reflection region 231a, It is composed of a right reflection area 231c formed on the right side of the central reflection area 231a, and an inner reflection area 231d that is continuous with the right reflection area 231c and is formed on the most central side of the reflection surface 231. Is composed of a lower reflection region 231e.

Among these, the reflective regions 231a to 231d formed in the substantially upper half of the reflective surface 231 are divided by a dividing line substantially along the vertical direction when viewed from the front, and are arranged side by side in the horizontal direction. Of these, the left reflection region 231b and the right reflection region 231c are formed so that the widths or surface areas along the left-right direction are substantially equal to each other. In the present embodiment, the bulb 22 (filaments 221, 222) is formed. ) And the plane orthogonal to the left-right direction are formed so as to be symmetrical with each other. In other words, the reflection surface 231 is provided with the inner reflection region 231d so that the left reflection region 231b and the right reflection region 231c have the same width or surface area.
The inner reflection region 231d is further divided into three by a dividing line that is substantially along the vertical direction when viewed from the front, and specifically, the first inner reflection region 231x from the vehicle side toward the vehicle center. , The second inner reflection region 231y and the third inner reflection region 231z.

The right headlamp 30 is formed symmetrically with the left headlamp 20 with respect to a plane orthogonal to the left-right direction at the center of the vehicle. Specifically, the right headlamp 30 has a bulb 32 and a reflector 33 in a lamp chamber formed by a housing (not shown) and an outer lens 31.
Among these, the bulb 32 is configured in the same manner as the bulb 22 of the left headlamp 20 and includes a main line filament 321 and a sub-line filament 322 which are light emitters (light emission centers).

Like the reflector 23 of the left headlamp 20, the reflector 33 is formed in a substantially curved plate shape that opens forward, and a bottom surface (front surface) in the opening serves as a reflective surface 331.
The reflecting surface 331 is a free-form surface based on a paraboloid of revolution, and is arranged so that the filaments 321 and 322 of the bulb 32 are located in the vicinity of the focal point. The focal point of the reflecting surface 331 is located on the side of the vehicle with respect to the center of the reflecting surface 331 in the left-right direction.

The reflection surface 331 is composed of a plurality of reflection regions that reflect light to different regions, and specifically, a central reflection region in which the substantially upper half is formed at a position closest to the bulb 32. 331a, a left reflective region 331b formed on the left side of the central reflective region 331a, a right reflective region 331c formed on the right side of the central reflective region 331a, and the left reflective region 331b and the most reflective surface 331 The inner reflection area 331d is formed on the center side, and the substantially lower half is formed of the lower reflection area 331e.
Accordingly, in the reflective surface 331, only the left reflective area 331b and the right reflective area 331c have the same positional relationship in the left-right direction as the left reflective area 231b and the right reflective area 231c of the left headlamp 20, that is, the left side The reflective area 231b and the right reflective area 231c are not in a plane-symmetrical positional relationship.

Of the reflective surface 331, the reflective regions 331a to 331d formed in substantially the upper half of the reflective surface 331 are divided by dividing lines substantially along the vertical direction when viewed from the front, and are arranged side by side in the horizontal direction. Of these, the left reflection region 331b and the right reflection region 331c are formed so that the widths or surface areas along the left-right direction are substantially equal to each other. In the present embodiment, the bulb 32 (filaments 321 and 322) is formed. ) And the plane orthogonal to the left-right direction are formed so as to be symmetrical with each other.
The inner reflection area 331d is further divided into three by a dividing line that is substantially along the vertical direction when viewed from the front. Specifically, the first inner reflection area 331x is directed from the side of the vehicle toward the center of the vehicle. , The second inner reflection region 331y and the third inner reflection region 331z.

  These reflection areas 331a to 331c, 331e, and 331x to 331z have substantially the same width or surface area along the left-right direction as that of the left headlamp 20 (corresponding reflection areas 231a to 231c, 231e, 231x to 231z). As will be described later, the light is reflected toward the corresponding region (the same region) in the light distribution pattern.

Then, the light distribution pattern formation aspect in the vehicle headlamp unit 1 will be described.
FIG. 3 is a diagram showing the passing beam LB in the light distribution pattern formed on the virtual screen in front of the vehicle by the vehicle headlamp unit 1.

First, the formation mode of the passing beam LB in the vehicle headlamp unit 1 will be described.
In the left headlamp 20 and the right headlamp 30, when the sub-line filaments 222 and 322 of the bulbs 22 and 32 are turned on, the light is reflected from the reflecting surfaces 231 and 331 of the reflectors 23 and 33 in the lower reflection region 231e, The light is reflected forward by the reflection areas excluding 331e, that is, the central reflection areas 231a and 331a, the left reflection areas 231b and 331b, the right reflection areas 231c and 331c, and the inner reflection areas 231d and 331d.

As shown in FIG. 3, these lights are reflected by the respective reflective areas of the left headlamp 20 and by the respective reflective areas of the right headlamp 30 and are reflected to corresponding areas (the same area) in front of the vehicle. As a result, a low beam LB is formed.
Specifically, the light reflected by the central reflection areas 231a and 331a is widely distributed in the left-right direction to form a light distribution area Pa, and the light reflected by the left reflection areas 231b and 331b is near the center. Among them, light is distributed from the vertical line V to the right side to form a light distribution region Pb, and the light reflected by the right reflection regions 231c and 331c is distributed from the right side to the left side of the vertical line V in the vicinity of the center. The light is distributed to form a light distribution region Pc. The light reflected by the inner reflection regions 231d and 331d is distributed to a region (for example, the vertical line V to 3.0R) including the high light intensity region Ph near the center in the left-right direction to form a light distribution region Pd. To do. More specifically, the first inner reflection areas 231x and 331x, the second inner reflection areas 231y and 331y, and the third inner reflection areas 231z and 331z constituting the inner reflection areas 231d and 331d are respectively light distribution areas Pd. Form. And the passing beam LB which consists of these light distribution area | region Pa-Pd is formed. This passing beam LB is formed such that the cut-off line CL, which is the bright and dark boundary line at the upper end, is horizontal over the entire area while substantially coincident with the horizontal line H.

  Here, the light distribution region Pb and the light distribution region Pc formed by the left reflection regions 231b and 331b and the right reflection regions 231c and 331c are regions including the high light intensity region Ph near the center in the left-right direction of the passing beam LB. It has become. The high light intensity area Ph is a light intensity requirement stipulated by the laws and regulations of each country, especially in areas where high light intensity is required (for example, Federal Motor Vehicle Safety Standards and Regulations (FMVSS)) on the virtual screen [ 0.6D-1.3R] and [1.5D-2.0R]. Therefore, when the size of the reflecting surfaces 231 and 331 is limited and the area of the left reflecting regions 231b and 331b or the right reflecting regions 231c and 331c cannot be secured sufficiently, the luminous intensity of the high luminous intensity region Ph may be insufficient. There is. In particular, the high luminous intensity region Ph is located near the upper end of the light distribution region Pc, but is located in the center of the light distribution region Pb. The influence of the left reflective areas 231b and 331b forming the area Pb is relatively strong. Therefore, when the size of the reflecting surfaces 231 and 331 is limited, the amount of light from the left headlamp 20 to the high luminous intensity region Ph tends to be insufficient because the area of the left reflecting region 231b tends to be smaller. However, in the vehicle headlamp unit 1 according to the present embodiment, light is irradiated to the light distribution region Pd including the high light intensity region Ph by the inner reflection regions 231d and 331d, and therefore the size of the reflection surfaces 231 and 331 is limited. Even in such a case, the luminous intensity requirement of the high luminous intensity region Ph can be satisfied.

  On the other hand, in the left headlamp 20 and the right headlamp 30, when the filaments 221 and 321 of the main lines of the bulbs 22 and 32 are respectively lit, the light is reflected in all the reflection areas of the reflection surfaces 231 and 331 of the reflectors 23 and 33. Reflected to form a traveling beam (not shown) in front of the vehicle. That is, from the entire reflecting surfaces 231 and 331 including the central reflecting areas 231a and 331a, the left reflecting areas 231b and 331b, the right reflecting areas 231c and 331c, the inner reflecting areas 231d and 331d, and the lower reflecting areas 231e and 331e. A traveling beam is formed by the reflected light.

  As described above, according to the vehicle headlamp unit 1, the left and right reflection areas 231 b and 331 b and the right reflection areas 231 c and 331 c are arranged on the left and right reflection surfaces 231 and 331 of the left headlamp 20 and the right headlamp 30. The inner reflection regions 231d and 331d are provided so that the widths or surface areas along the direction are equal to each other, and these reflection regions correspond to regions corresponding to those of the left headlamp 20 and the right headlamp 30 ( Since the light is reflected to the same region), the left headlamp 20 and the right headlamp 30 can form the same light distribution. Therefore, even if the left head lamp 20 and the right head lamp 30 that are inclined rearward from the center of the vehicle toward the side of the vehicle are formed, an appropriate passing beam LB that does not give the driver a sense of incongruity is formed. can do.

  In addition, the inner reflection regions 231d and 331d emit light to the light distribution region Pd including the high light intensity region Ph in the passing beam LB. Therefore, when the size of the reflection surfaces 231 and 331 is limited, the left head Even when the area of the left reflective region 231b cannot be sufficiently secured in the lamp 20, the luminous intensity requirement of the high luminous intensity region Ph can be satisfied. Therefore, even when the inclination from the vehicle center side toward the vehicle side is steep and the lamp size is limited, the light intensity requirement of the high light intensity region Ph can be satisfied.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the bulb 22 (32) has the two filaments 221, 222 (321, 322). However, the bulb 22 (32) may have only one filament for forming the low beam LB.

  In addition, the first inner reflection region 231x (331x), the second inner reflection region 231y (331y), and the third inner reflection region 231z (331z), which constitute the inner reflection region 231d (331d), are respectively distributed. Although the region Pd is formed, these reflective regions are respectively paired with the left headlamp 20 and the right headlamp 30 to the corresponding region (same region) in the passing beam LB. The first inner reflection region 231x (331x), the second inner reflection region 231y (331y), and the third inner reflection region 231z (331z) are different from each other as long as the light is configured to be reflected toward the head. It is good also as reflecting light to an area | region.

  Further, the inner reflection region 231d (331d) is divided into three parts, a first inner reflection region 231x (331x), a second inner reflection region 231y (331y), and a third inner reflection region 231z (331z). However, the number of divisions is not particularly limited, and may not be divided.

1 Vehicle headlamp unit 20 Left headlamp (left headlamp)
22 Valve 221 Filament 222 Filament 23 Reflector 231 Reflecting surface 231a Central reflecting area 231b Left reflecting area 231c Right reflecting area 231d Inner reflecting area 231x First inner reflecting area 231y Second inner reflecting area 231z Third inner reflecting area 231e Lower reflecting area 30 Right headlamp (right headlight)
32 Valve 321 Filament 322 Filament 33 Reflector 331 Reflecting surface 331a Central reflecting area 331b Left reflecting area 331c Right reflecting area 331d Inner reflecting area 331x First inner reflecting area 331y Second inner reflecting area 331z Third inner reflecting area 331e Lower reflecting area LB Passing beam Pa Light distribution area Pb Light distribution area Pc Light distribution area Pd Light distribution area Ph High light intensity area CL Cut-off line H Horizontal line V Vertical line

Claims (4)

A vehicle headlamp that is mounted on the left and right sides of the front part of the vehicle and includes a left headlight and a right headlight that are inclined rearward from the vehicle center toward the vehicle side, and forms a passing beam in front of the vehicle In the unit
The left headlight and the right headlight are:
A valve,
A reflective surface that is formed in a shape that opens forward and is arranged so that the bulb is positioned in the vicinity of the focal point thereof, and reflects light emitted from the bulb forward,
Each with
The reflective surface has a plurality of reflective areas that reflect light toward corresponding areas in the passing beam between the left headlight and the right headlamp.
The plurality of reflective regions are
A central reflective region formed in a position proximate to the bulb;
A left reflective region formed on the left side of the central reflective region;
A right reflective region formed on the right side of the central reflective region;
An inner side reflection region that is continuous with the left side reflection region or the right side reflection region and is formed on the most vehicle center side among the reflection surfaces, and
Including
The vehicular headlamp unit characterized in that the left reflective area and the right reflective area have the same width or surface area along the left-right direction.   2. The vehicle headlamp unit according to claim 1, wherein a focal point of the reflecting surface is located on a side of the vehicle with respect to a center of the reflecting surface in the left-right direction.   The vehicle headlamp unit according to claim 1 or 2, wherein the low-pass beam has a horizontal cut-off line at the upper end.   The vehicle according to any one of claims 1 to 3, wherein the inner reflection region reflects light toward a region including a high light intensity region near a center in a left-right direction of the passing beam. Headlight unit for use.

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