JP2013101775A - Illumination lamp for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector type illumination lamp for a vehicle with a shade in which brightness in a region in the vicinity of the lower part of a cutoff line on an opposite vehicle lane side is reduced without reducing the brightness on the hot zone of a low-beam light distribution pattern.SOLUTION: As a shade 20, an upper end edge 20Aa of a first region 20A located further toward an opposite vehicle lane side than a rear focal point F of a projection lens 18 is formed to pass the vicinity of the upper part of the rear focal point F. Thereby, the cutoff line on the own lane side is clearly formed and brightness of the lower part neighborhood region (that is, a region to become a hot zone) is sufficiently secured. Further, as the shade 20, an upper end edge 20Ba of a second region B adjoining the own lane side of the first region 20A is formed to be displaced to a rear side against the upper end edge 20Aa. Thereby, brightness in the lower part neighborhood is to be reduced, although the cutoff line on the opposite vehicle lane side becomes more or less unclear.

Description

  The present invention relates to a projector-type vehicular illumination lamp provided with a shade.

  In general, a projector-type vehicular illumination lamp is configured to reflect light from a light source disposed rearward of the rear focus of the projection lens toward the projection lens by a reflector.

  In such a projector-type vehicle illumination lamp, when forming a low beam light distribution pattern, for example, as described in “Patent Document 1,” the upper edge is the rear focal point of the projection lens or its vicinity. A part of the reflected light from the reflector is shielded by the shade arranged so as to pass through, thereby forming a cut-off line of the low beam light distribution pattern.

  On the other hand, “Patent Document 2” describes a vehicular illumination lamp in which two shades are arranged on both front and rear sides of a rear focal point of a projection lens.

  Further, in “Patent Document 3”, a shade having a thick upper end is arranged so that the front and rear edges of the upper end surface are positioned on both front and rear sides of the rear focus of the projection lens. A vehicle illumination lamp is described.

JP 2010-33740 A Japanese Patent Laid-Open No. 11-283405 JP 2010-218689 A

  By adopting a shade as described in the above-mentioned “Patent Document 2” and “Patent Document 3”, it is possible to prevent the low beam light distribution pattern from becoming brighter than necessary.

  However, when such a configuration is adopted, the brightness of the area near the lower side of the cutoff line on the opposite lane side in the low beam light distribution pattern is reduced so as not to give a large glare to the oncoming vehicle driver or the like. However, the brightness of the area near the cut-off line of the own lane side in the low beam light distribution pattern (that is, the area that should become the hot zone) is also reduced. There is a problem that the visibility of the vehicle lane and the shoulder portion on the road surface cannot be sufficiently secured.

  The present invention has been made in view of such circumstances, and in a projector-type vehicular illumination lamp equipped with a shade, the brightness of the hot zone of the low beam distribution pattern is reduced without reducing the brightness. An object of the present invention is to provide a vehicular illumination lamp that can reduce the brightness of a region near the lower side of a lane-side cut-off line.

  The present invention is intended to achieve the above object by devising the structure of the shade.

That is, the vehicular illumination lamp according to the present invention is:
A projection lens, a light source disposed behind the rear focal point of the projection lens, a reflector that reflects light from the light source toward the projection lens, and a portion of the reflected light from the reflector is shielded A vehicle lighting lamp comprising:
The shade is formed such that an upper end edge of the first region located on the opposite lane side from the rear focal point passes through the rear focal point of the projection lens or in the vicinity thereof, and the own lane of the first region. The upper edge of the second region adjacent to the side is formed so as to be displaced rearward with respect to the upper edge of the first region.

  The type of the “light source” is not particularly limited, and for example, a light emitting part of a discharge bulb, a filament of a halogen bulb, or the like can be employed.

  The “shade” is formed such that the upper end edge of the first region located on the opposite lane side from the rear focal point passes through the rear focal point of the projection lens or in the vicinity thereof, and the first region is on the own lane side. If the upper end edge of the second region adjacent to the first region is formed to be displaced rearward with respect to the upper end edge of the first region, the rearward displacement amount of the upper end edge of the second region and the formation of the second region The specific configuration such as the range is not particularly limited. The “shade” may be configured as a fixed shade, or a part or all of the “shade” may be configured as a movable shade.

  As shown in the above configuration, the vehicular illumination lamp according to the present invention is configured as a projector-type vehicular illumination lamp, and a part of the reflected light from the reflector is shielded by the shade. The shade is formed so that the upper edge of the first region located on the opposite lane side of the rear focal point passes through the rear focal point of the projection lens or in the vicinity thereof, and on the own lane side of the first region. Since the upper edge of the adjacent second region is formed so as to be displaced rearward with respect to the upper edge of the first region, the following operational effects can be obtained.

  That is, the first region of the shade (that is, the region located on the opposite lane side from the rear focal point of the projection lens) is arranged so that the upper edge passes through the rear focal point of the projection lens or the vicinity thereof. The cut-off line on the own lane side in the low-beam light distribution pattern can be clearly formed, and the brightness of the area near the lower side (that is, the area that should become the hot zone) can be sufficiently secured.

  On the other hand, the second region adjacent to the lane side of the first region is formed such that the upper edge thereof is displaced rearward with respect to the upper edge of the first region. Although the cut-off line on the opposite lane side is somewhat unclear, it is possible to reduce the brightness of the area near the lower side.

  Thus, according to the present invention, in the projector-type vehicular illumination lamp provided with the shade, the area near the lower side of the cutoff line on the opposite lane side without reducing the brightness of the hot zone of the light distribution pattern for low beam Can reduce the brightness.

  As a result, it is possible to prevent large glare from being imparted to the oncoming vehicle driver and the like while sufficiently ensuring the visibility of the vehicle traveling lane and the road shoulder on the road surface in front of the vehicle.

  And since the shade of the vehicular illumination lamp which concerns on this invention can be comprised easily by a plate-shaped member, the said effect can be obtained, suppressing lamp cost.

  In the above configuration, if the second shade having the upper edge substantially the same height as the upper edge of the second region is arranged in front of the second region of the shade, the following operational effects are obtained. be able to.

  That is, when the upper edge of the second area is displaced rearward with respect to the upper edge of the first area as in the shade of the present invention, the opposite lane side in the low beam light distribution pattern as described above. If the second shade having the upper edge substantially the same height as the upper edge of the second region is arranged in front of the second area, the cut-off line of The light which goes to the upper space of the cut-off line can be eliminated. As a result, it is possible to effectively reduce the brightness of the area near the lower side thereof while ensuring the sharpness of the cutoff line on the opposite lane side in the low beam light distribution pattern.

  When such a configuration is adopted, if the second shade has an upper end surface formed so as to face obliquely upward and rearward, reflected light from the reflector incident on the upper end surface is reflected on this It is possible to easily prevent the light from entering the projection lens after being reflected by the end face. As a result, it is possible to prevent inadvertently irradiating light that gives glare to an oncoming vehicle driver or the like from the vehicle illumination lamp.

  At this time, if the second shade is constituted by a plate-like member arranged so as to extend obliquely downward and forward, the above-described effects can be obtained while suppressing the lamp cost.

Front view showing a vehicular illumination lamp according to an embodiment of the present invention II-II sectional view of FIG. III-III sectional view of FIG. The perspective view which shows the main components of the said illumination lamp for vehicles Detailed view of part V in FIG. The figure which shows perspectively the light distribution pattern for low beams formed on the virtual vertical screen arrange | positioned in the position of 25 m ahead of the lamp | ramp by the light irradiated ahead from the said vehicle lighting lamp.

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

  FIG. 1 is a front view showing a vehicular illumination lamp 10 according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. Further, FIG. 4 is a perspective view showing main components of the vehicular illumination lamp 10.

  As shown in these drawings, the vehicular illumination lamp 10 according to this embodiment is a lamp unit for a vehicular headlamp, and is incorporated in a lamp body or the like (not shown) so that the optical axis can be adjusted. It has come to be used.

  The vehicular illumination lamp 10 includes a light source bulb 12, a reflector 14, a lens holder 16, a projection lens 18, a shade 20, and a second shade 22, and a light distribution pattern for a low beam with a right light distribution. (This will be described later).

  The projection lens 18 is a plano-convex aspheric lens having a convex front surface and a flat rear surface, and is disposed such that its optical axis Ax extends in the vehicle front-rear direction. The projection lens 18 converts the light source image formed on the rear focal plane (that is, the focal plane including the rear focal point F of the projection lens 18) as an inverted image on a virtual vertical screen arranged in front of the lamp. Projected.

  The light source bulb 12 is a discharge bulb having a discharge light emitting portion as a light source 12a, and is inserted and fixed from the rear side to an opening portion 14b formed at the rear top portion of the reflector 14. The light source 12 a of the light source bulb 12 is configured as a line light source extending substantially coaxially with the optical axis Ax, and is disposed on the rear side of the rear focal point F of the projection lens 18.

  The reflector 14 has a reflection surface 14 a that reflects light from the light source 12 a toward the projection lens 18.

  The reflecting surface 14a is set to have a substantially elliptical cross-sectional shape along the plane including the optical axis Ax, and the eccentricity is set to gradually increase from the vertical cross section toward the horizontal cross section. As a result, the light from the light source 12a reflected by the reflecting surface 14a is substantially converged to the vicinity of the rear focal point F in the vertical section, and the convergence position is set to the front side of the rear focal point F in the horizontal section. It is supposed to be displaced.

  The reflector 14 is formed with a pair of left and right arm portions 14c extending forward from the front end edge of the lower region of the reflecting surface 14a. The front end portion of each arm portion 14c has a radially outward portion. A flange portion 14d is formed so as to be bent.

  The lens holder 16 is disposed in front of the reflector 14 and fixedly supports the projection lens 18 at the front end thereof. The lens holder 16 is formed with a pair of left and right arm portions 16a extending rearward from the lower region of the front end portion thereof, and the rear end portions of the arm portions 16a are bent outward in the radial direction. In this way, the flange portion 16b is formed.

  The shade 20 is disposed so that the upper edge 20a thereof passes near the upper portion of the rear focal point F of the projection lens 18, and shields part of the reflected light from the reflector 14.

  The shade 20 is configured as a press-processed product made of a metal plate member, and is disposed along a vertical plane perpendicular to the optical axis Ax at the rear focal point F of the projection lens 18. And this shade 20 is being fixed to the reflector 14 and the lens holder 16 in the lower end part of the both right and left sides. Specifically, the shade 20 is screwed at two locations between the flange portion 14d of each arm portion 14c in the reflector 14 and the flange portion 16b of each arm portion 16a in the lens holder 16. 30 is fastened together. In order to realize this, the thread 20 is formed with screw insertion holes 20b at two locations, and the flange portions 16b of the lens holder 16 are also formed with screw insertion holes (not shown). Each flange portion 14d is formed with a screw hole (not shown).

  The shade 20 has a top edge 20Aa leftward from the optical axis Ax in the first region 20A located on the opposite lane side of the optical axis Ax (that is, the left side (right side in the front view of the lamp, the same applies hereinafter)). It is formed so as to extend horizontally, after slightly extending obliquely downward.

  On the other hand, the shade 20 is slightly above the horizontal plane including the optical axis Ax at the upper edge 20Ba, 20Ca of the second and third regions 20B, 20C located on the own lane side (that is, the right side) with respect to the optical axis Ax. Are formed to extend horizontally from the optical axis Ax to the right. In this case, the second area 20B adjacent to the first area 20A on the own lane side is formed such that the upper end edge 20Ba is displaced rearward with respect to the upper end edge 20Aa of the first area 20A. . At this time, the backward displacement amount of the upper edge 20Ba of the second region 20B with respect to the upper edge 20Aa of the first region 20A is set to a value of about 1 to 3 mm (for example, about 2 mm).

  The second shade 22 is disposed in front of the shade 20. This 2nd shade 22 is comprised as a press work goods which consist of metal plate-shaped members.

  The second shade 22 extends obliquely downward and forward from the upper end edge toward the lower end edge (specifically, about 10 to 30 ° (for example, about 20 °) with respect to a plane orthogonal to the optical axis Ax). A flange portion 22b extending along a vertical plane perpendicular to the optical axis Ax is formed at both left and right end portions of the second shade 22, The pair of left and right flange portions 22b are fixed to the shade 20 by welding or the like.

  The upper end edge 22a of the second shade 22 is substantially the same height as the upper end edge 20Ba of the second region 20B of the shade 20 so that the upper end edge 22Ba of the second region corresponding portion 22B located in front of the second region 20B of the shade 20 is the same. Now, it is formed to extend in the horizontal direction. At this time, the upper edge 22Ba of the second region corresponding portion 22B is formed so as to be displaced forward from the edge position on the own lane side toward the edge position on the opposite lane side.

  The opposite lane side adjacent portion 22A adjacent to the opposite lane side of the second region corresponding portion 22B in the second shade 22 has its upper edge 20Aa extending obliquely downward toward the opposite lane side, and then toward the opposite lane side. Are formed to extend horizontally.

  On the other hand, the own lane side adjacent part 22C adjacent to the own lane side of the second region corresponding part 22B in the second shade 22 is formed such that the upper end edge 20Ca extends obliquely downward toward the own lane side. .

  FIG. 5 is a detailed view of a portion V in FIG.

  As shown in the figure, the second shade 22 is composed of a plate-like member, and thus has an upper end surface 22c. The second shade 22 is disposed so as to extend obliquely downward and forward. Therefore, the upper end surface 22c is in a state formed so as to face obliquely upward and rearward.

  Since the second shade 22 is disposed in front of the rear focal point F of the projection lens 18, the reflected light from the reflector 14 is reflected by the upper end surface 22c and then compared with a horizontal plane including the optical axis Ax. When the light enters the projection lens 18 at a target height, the light is emitted from the projection lens 18 as slightly upward light, and glare is imparted to the driver of the oncoming vehicle.

  In this respect, the second shade 22 is arranged with its upper end surface 22c facing obliquely upward and rearward, so that the reflected light from the reflector 14 is reflected by the upper end surface 22c and then the projection lens 18. Even if it goes to the upper space or is incident on the projection lens 18, it is incident on the upper end region thereof, so that it will be emitted from the projection lens 18 as upward light at a large angle. There is no fear of giving.

  FIG. 5 is a perspective view showing a low beam light distribution pattern PL formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicular illumination lamp 10.

  This low beam light distribution pattern PL is a right light low beam light distribution pattern, and has upper and lower cut-off lines CL1 and CL2 at its upper edge. The cut-off lines CL1 and CL2 are formed so as to extend in the horizontal direction with a difference in left and right steps with a VV line passing through the HV as a vanishing point in the front direction of the lamp in the vertical direction. At that time, the cut-off line CL1 on the opposite lane side on the left side of the VV line is formed so as to extend in the horizontal direction over the entire length, while the cut-off line on the own lane side on the right side of the VV line. CL2 is formed to extend in the horizontal direction after rising from the right end position of the cutoff line CL1 on the opposite lane side via an inclined portion.

  The low-beam light distribution pattern PL is obtained by converting the image of the light source 12a formed on the rear focal plane of the projection lens 18 by the light from the light source 12a reflected by the reflection surface 14a of the reflector 14 by the projection lens 18 to the virtual vertical direction. It is formed by projecting as a reverse projection image on the screen, and the cut-off lines CL1 and CL2 with different left and right steps are formed as reverse projection images of the upper edge 20a of the movable shade 20.

  In this low beam distribution pattern PL, the elbow point E, which is the intersection of the cut-off line CL1 on the opposite lane side and the VV line, is located about 0.5 to 0.6 ° below HV. . This is because the portion located on the left side of the optical axis Ax at the upper edge 20a of the shade 20 extends horizontally from the optical axis Ax to the left slightly above the horizontal plane including the optical axis Ax. . In the low beam light distribution pattern PL, a hot zone HZ that is a high luminous intensity region is formed so as to surround the elbow point E to the right.

  On the other hand, in this low beam light distribution pattern PL, the lower vicinity area Z1 of the portion near the elbow point E of the cutoff line CL1 on the opposite lane side is darker than the surrounding area.

  The lower vicinity region Z1 is a relatively dark region because, of the upper end edge 20a of the shade 20, the upper end edge 20Aa of the first region 20A located on the opposite lane side from the optical axis Ax is While extending along a vertical plane orthogonal to the optical axis Ax at the rear focal point F, the upper edge 20Ba of the second region 20B adjacent to the own lane side of the first region 20A is the first region 20A. This is because the upper end edge 20Aa is displaced rearward.

  At this time, the cut-off line CL1 on the opposite lane side is formed as a clear cut-off line, although the light-to-dark ratio is relatively low even in the portion near the elbow point E (that is, the upper edge portion of the lower vicinity region Z1). Has been. This is because the upper edge 22Ba of the second region corresponding portion 22B in the second shade 22 arranged in front of the shade 20 extends in the horizontal direction at substantially the same height as the upper edge 20Ba of the second region 20B of the shade 20. It is because it is formed.

  Further, the lower vicinity region Z1 is formed such that the portion near the elbow point E relatively expands downward. This is formed so that the upper edge 22Ba of the second region corresponding portion 22B in the second shade 22 is displaced forward from the edge position on the own lane side toward the edge position on the opposite lane side. It is because.

  Next, the effect of this embodiment is demonstrated.

  The vehicular illumination lamp 10 according to the present embodiment is configured as a projector-type lamp unit, and a part of the reflected light from the reflector 14 is shielded by the shade 20. The upper edge 20Aa of the first region 20A located on the opposite lane side from the rear focal point F of the projection lens 18 is formed so as to pass near the upper part of the rear focal point F of the projection lens 18, and the first Since the upper edge 20Ba of the second area 20B adjacent to the own lane side of the area 20A is formed to be displaced rearward with respect to the upper edge 20Aa of the first area 20A, the following operational effects Can be obtained.

  In other words, the first region 20A of the shade 20 (that is, the region located on the opposite lane side with respect to the rear focal point F of the projection lens 18) has its upper edge 20Aa passing near the upper portion of the rear focal point F of the projection lens 18. Therefore, the cut-off line CL2 on the own lane side in the low beam light distribution pattern PL is clearly formed, and the brightness in the lower vicinity region (that is, the region that should become the hot zone HZ) is sufficiently secured. be able to.

  On the other hand, the second region 20B adjacent to the own lane side of the first region 20A is formed such that its upper end edge 20Ba is displaced rearward with respect to the upper end edge 20Aa of the first region 20A. Although the cut-off line CL1 on the opposite lane side in the light distribution pattern PL for use is slightly blurred, the brightness of the lower vicinity region Z1 can be reduced.

  As described above, according to the present embodiment, in the projector-type vehicular illumination lamp 10 provided with the shade 20, the cut on the opposite lane side is performed without reducing the brightness of the hot zone HZ of the low beam light distribution pattern PL. The brightness of the lower vicinity region Z1 of the offline CL1 can be reduced.

  As a result, it is possible to prevent large glare from being imparted to the oncoming vehicle driver and the like while sufficiently ensuring the visibility of the vehicle traveling lane and the road shoulder on the road surface in front of the vehicle.

  In addition, since the shade 20 of the vehicular illumination lamp 10 according to the present embodiment is configured by a plate-like member, the above-described effects can be obtained while suppressing the lamp cost.

  Further, the vehicular lamp 10 according to the present embodiment has a second shade 22 having an upper end edge 22Ba having a height substantially equal to the upper end edge 20Ba of the second region 20B in front of the second region 20B of the shade 20. Therefore, the following operational effects can be obtained.

  That is, when the upper end edge 20Ba of the second region 20B is displaced rearward with respect to the upper end edge 20Aa of the first region 20A as in the shade 20 of the present embodiment, as described above, the arrangement for low beam is performed. Although the cut-off line CL1 on the opposite lane side in the light pattern PL is somewhat unclear, a second shade 22 having an upper end edge 22Ba that is substantially the same height as the upper end edge 20Ba is disposed in front of the second region 20B. Therefore, it is possible to eliminate light traveling from the projection lens 18 to the space above the cutoff line CL1 on the opposite lane side. As a result, it is possible to effectively reduce the brightness of the lower vicinity region Z1 while ensuring the sharpness of the cutoff line CL1 on the opposite lane side in the low beam light distribution pattern PL.

  In that case, since the 2nd shade 22 is comprised by the plate-shaped member arrange | positioned so that it may extend toward diagonally downward front, the said effect can be acquired, suppressing lamp cost.

  Further, since the second shade 22 includes an upper end surface 22c formed so as to face obliquely upward and rearward, reflected light from the reflector 14 incident on the upper end surface 22c is reflected by the upper end surface 22c. It is possible to easily prevent the light from entering the projection lens 18 later. As a result, it is possible to prevent inadvertently irradiating light that gives glare to an oncoming vehicle driver or the like from the vehicle illumination lamp 10.

  In the above-described embodiment, the vehicular illumination lamp 10 has been described as being configured to form the right light distribution light beam distribution pattern as the low beam light distribution pattern PL. Even when the light distribution pattern is configured to be formed, the same effect can be obtained by adopting the same configuration as that of the above embodiment.

  In addition, the numerical value shown as a specification in the said embodiment is only an example, and of course, you may set these to a different value suitably.

DESCRIPTION OF SYMBOLS 10 Vehicle illumination lamp 12 Light source bulb 12a Light source 14 Reflector 14a Reflective surface 14b Opening part 14c, 16a Arm part 14d, 16b Flange part 16 Lens holder 18 Projection lens 20 Shade 20a, 20Aa, 20Ba, 20Ca Upper edge 20b Screw insertion hole 20A First region 20B Second region 20C Third region 22 Second shade 22a, 22Aa, 22Ba, 20Ca Upper edge 22b Flange portion 22c Upper end surface 22A Opposing lane side adjacent portion 22B Second region corresponding portion 22C Own lane side adjacent portion 30 Screw Ax Optical axis CL1 Cut-off line on opposite lane side CL2 Cut-off line on own lane side E Elbow point F Rear focus HZ Hot zone PL Light distribution pattern for low beam Z1 Near lower area

Claims (4)

A projection lens, a light source disposed behind the rear focal point of the projection lens, a reflector that reflects light from the light source toward the projection lens, and a portion of the reflected light from the reflector is shielded A vehicle lighting lamp comprising:
The shade is formed such that an upper end edge of the first region located on the opposite lane side from the rear focal point passes through the rear focal point of the projection lens or in the vicinity thereof, and the own lane of the first region. A vehicular illumination lamp, wherein an upper end edge of a second region adjacent to the side is formed to be displaced rearward with respect to an upper end edge of the first region.   2. The vehicular illumination lamp according to claim 1, wherein a second shade having an upper edge substantially the same height as the upper edge of the second area is disposed in front of the second area of the shade. .   3. The vehicular illumination lamp according to claim 2, wherein the second shade includes an upper end surface formed so as to face obliquely upward and rearward.   The vehicular illumination lamp according to claim 3, wherein the second shade is configured by a plate-like member disposed so as to extend obliquely downward and forward.

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