JP2012206684A - Vehicular illuminating lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a visibility of lane mark sufficiently in a vehicular illuminating lamp device which is composed so that light distribution pattern for lane mark illumination may be formed in overlay with respect to light distribution pattern for low beam.SOLUTION: A dominant wavelength λd of blue light emitted from a second optical system is set so that a straight line L1, connecting a color temperature [x1, y1] <halogen bulb> of white light emitted from a first optical system for forming the light distribution pattern for low beam and color temperature [x2, y2] <the present embodiment> of blue light irradiated from the second optical system for forming the light distribution pattern for the lane mark illumination, may be dislocated from a color temperature range Zp of purple. As a result, an illumination light of purple making car driver unpleasant by a mixed colors between the white light and blue light can be prevented from being generated.

Description

  The present invention relates to a vehicular illuminating lamp configured to be able to be formed by superimposing a light distribution pattern for lane mark irradiation on a light distribution pattern for low beam.

  Conventionally, a vehicle configured such that a lane mark light distribution pattern for irradiating a lane mark (that is, a white line for partitioning a vehicle lane) can be superimposed on a low beam light distribution pattern. Lighting fixtures are known.

  For example, “Patent Document 1” describes a vehicular illumination lamp including an additional lamp unit for forming a lane mark illumination light distribution pattern in addition to a basic lamp unit for forming a low beam light distribution pattern. Has been.

  On the other hand, in “Patent Document 2”, in addition to the basic lamp unit for forming a low beam light distribution pattern, an additional light distribution pattern that reinforces the brightness of the vehicle peripheral area visually recognized by the driver's peripheral vision is formed. There is described a vehicular illumination lamp provided with an additional lamp unit for the purpose. In this case, this "Patent Document 2" describes that it is preferable to irradiate the far front of the vehicle with light that includes more short wavelength components than the light that irradiates the vehicle peripheral region.

JP 2003-59317 A JP 2009-125444 A

  In the vehicular illumination lamp described in the “Patent Document 1”, it is possible to irradiate the lane mark on the road surface in front of the vehicle by the additional light distribution pattern formed by the additional lamp unit.

  However, in the vehicular illumination lamp described in “Patent Document 1”, since the light sources of the basic lamp unit and the additional lamp unit are both halogen bulbs, an additional light distribution pattern for irradiating the lane mark is provided. Even when it is formed by superimposing on the low beam light distribution pattern, there is a problem that the visibility of the lane mark can be increased only by the increase in the amount of light.

  On the other hand, also in the vehicular illumination lamp described in “Patent Document 2”, it is possible to irradiate the lane mark on the road surface in front of the vehicle by the additional light distribution pattern formed by the additional lamp unit.

  However, in the vehicular illumination lamp described in “Patent Document 2”, the low beam light distribution pattern and the additional light distribution pattern are both formed of the same type of light, or the low beam light distribution pattern is added. There is a problem in that the visibility of the lane mark cannot be improved because it is formed of light containing a shorter wavelength component than the light distribution pattern.

  The present invention has been made in view of such circumstances, and is a vehicle illumination lamp configured to be able to form a light distribution pattern for lane mark overlapping with a light distribution pattern for low beam. An object of the present invention is to provide a vehicular illumination lamp that can sufficiently enhance the visibility of a lane mark.

  The present invention is intended to achieve the above object by forming a light distribution pattern for lane mark irradiation with a predetermined blue light with respect to a light distribution pattern for low beam formed with white light. is there.

That is, the vehicular illumination lamp according to the present invention is:
In the vehicular illumination lamp configured to be able to overlap the light distribution pattern for lane mark irradiation with the light distribution pattern for low beam,
A first optical system that irradiates the front of the lamp with white light for forming the light distribution pattern for low beam, and a second optical system that irradiates the front of the lamp with blue light for forming the light distribution pattern for lane mark irradiation. With an optical system,
On the CIExy chromaticity diagram, chromaticity [x1, y1] of white light emitted from the first optical system, and chromaticity [x2, y2] of blue light emitted from the second optical system, and A straight line connecting
y <0.5x + 0.05
y <2x-0.3
y <-0.93831x + 0.625325
The dominant wavelength λd of the blue light emitted from the second optical system is set so as to pass outside the purple chromaticity range defined in (1).

  As long as the “first optical system” is an optical system configured to irradiate the front of the lamp with white light for forming a low beam light distribution pattern, the specific configuration thereof is particularly limited. is not.

  The above-mentioned “second optical system” is not particularly limited as long as it is an optical system configured to irradiate the front of the lamp with blue light for forming a light distribution pattern for lane mark irradiation. It is not something.

  The above “light distribution pattern for lane mark irradiation” means a light distribution pattern for irradiating the lane mark on the road surface in front of the vehicle. In this case, the lane mark to be irradiated is the shoulder side of the own lane. May be the lane mark on the opposite lane, or both lane marks.

  The “blue light” has its dominant wavelength λd set so that a straight line connecting the chromaticity [x2, y2] and the chromaticity [x1, y1] of white light passes outside the purple chromaticity range. If it is, the specific value of the chromaticity [x2, y2] is not particularly limited.

  As shown in the above configuration, the vehicular illumination lamp according to the present invention has a configuration in which the light distribution pattern for lane mark irradiation can be formed in a superimposed manner on the light distribution pattern for low beam. A first optical system for irradiating the front of the lamp with white light for forming a light distribution pattern, and a second optical system for irradiating the front of the lamp with blue light for forming a light distribution pattern for lane mark irradiation; Therefore, the following operational effects can be obtained.

  That is, conventionally, it is known as Purkinje shift that the wavelength at which the maximum visual sensitivity is obtained shifts to the short wavelength side as it shifts from photopic vision to twilight vision to scotopic vision. This relates to the visibility in the central visual field (that is, the region near the gazing point), but the same phenomenon occurs in the peripheral visual field (that is, the peripheral vision region). Specifically, when the entire visual field is illuminated with white light and the peripheral visual field is illuminated with blue light, the peripheral visual field is visible even if the peripheral visual field has the same luminance as the central visual field. The characteristics are greatly improved.

  Accordingly, like the vehicular illumination lamp according to the present invention, the low beam distribution pattern is formed by the white light irradiated from the first optical system to the front of the lamp, and then the lamp from the second optical system. If the light distribution pattern for lane mark irradiation is formed by the blue light irradiated forward, the visibility of the lane mark can be improved. Moreover, since the lane mark is generally a white line, the visibility can be further improved by irradiating it with blue light.

  However, depending on the chromaticity of the blue light emitted from the second optical system to the front of the lamp, a purple irradiation light is generated by mixing the blue light and the white light emitted from the first optical system to the front of the lamp. It will be done. Since this purple irradiation light gives an unpleasant feeling to the driver of the vehicle, the visibility of the lane mark may be rather lowered by forming the light distribution pattern for lane mark irradiation.

In that respect, in the vehicular illumination lamp according to the present invention, on the CIExy chromaticity diagram, the chromaticity [x1, y1] of white light emitted from the first optical system and the second optical system are emitted. A straight line connecting the chromaticity [x2, y2] of blue light
y <0.5x + 0.05
y <2x-0.3
y <-0.93831x + 0.625325
Since the dominant wavelength λd of the blue light emitted from the second optical system is set so as to deviate from the purple chromaticity range defined in FIG. It is possible to prevent the purple irradiation light from being generated when the patterns are overlapped. Therefore, it is possible to eliminate the possibility that the driver of the vehicle is uncomfortable, thereby maintaining the visibility of the lane mark in a good state.

  As described above, according to the present invention, in the vehicular illumination lamp configured to be able to superimpose the light distribution pattern for lane mark irradiation on the light distribution pattern for low beam, the visibility of the lane mark is sufficiently increased. Can be increased.

  In the above configuration, when the vehicle is traveling on a straight road if the third optical system for irradiating the blue light to the region near the horizontal cutoff line on the opposite lane side in the low beam light distribution pattern is provided. In addition, the visibility of the lane mark can be sufficiently improved even when traveling on a curved road or when traveling near the end point of a downhill.

  In this case, if the blue light emitted from the third optical system is applied to the region near the horizontal cutoff line on the opposite lane side in the low beam light distribution pattern, the specific irradiation range is particularly limited. In that case, it may be irradiated to the upper side from the horizontal cut-off line on the opposite lane side, or may not be irradiated. When the blue light from the third optical system is irradiated above the horizontal cutoff line on the oncoming lane, the brightness of the blue light does not cause glare to the oncoming car driver. Even so, it is possible to sufficiently enhance the visibility of the lane mark.

  In the above configuration, the first optical system includes a white light source and a reflective optical system that reflects light from the white light source toward the front of the lamp, and a part of the reflective optical system is configured. It is also possible to configure the second optical system by coloring the reflecting surface to be colored blue. When such a configuration is adopted, the above-described effects can be obtained even with a vehicular illumination lamp that does not include a blue light source.

Front view showing a vehicular illumination lamp according to an embodiment of the present invention In both (a) and (b), a low beam light distribution pattern and a lane mark irradiation distribution formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by the light irradiated forward from the vehicle lamp. Figure showing the light pattern in perspective Figure similar to Figure 2 CIExy chromaticity diagram for explaining the operation of the above embodiment The front view which shows the vehicle lighting device which concerns on the 1st modification of the said embodiment. The same figure as FIG. 2 which shows the effect | action of the said 1st modification. The front view which shows the vehicle lighting device which concerns on the 2nd modification of the said embodiment. The same figure as FIG. 2 which shows the effect | action of the said 2nd modification.

  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 the present embodiment.

  As shown in the figure, the vehicular illumination lamp 10 is a headlamp provided at the left front end of a vehicle, and includes a lamp body 12 and a transparent translucent cover 14 attached to the front end opening. The first lamp unit 20, the second lamp unit 30, and the eight third lamp units 40A, 40B, 40C, 40D, 40E, 40F, 40G, and 40H are accommodated in the formed lamp chamber. ing.

  In the vehicular illumination lamp 10, a low beam light distribution pattern is formed by the irradiation light from the second lamp unit 30, and the irradiation light from the second lamp unit 30 is converted into the irradiation light from the first lamp unit 20. By adding irradiation light, a high beam light distribution pattern is formed. Furthermore, in this vehicular illumination lamp 10, a lane mark irradiation light distribution pattern is formed by irradiation light from all or part of the eight third lamp units 40A to 40H.

  At this time, the first lamp unit 20 is a parabolic lamp having a halogen bulb 22 disposed on the optical axis Ax1 extending in the vehicle front-rear direction and a reflector 24 that reflects light from the halogen bulb 22 forward. It is configured as a unit.

  On the other hand, the second lamp unit 30 includes a projection lens 32 disposed on the optical axis Ax2 extending in the vehicle front-rear direction, a halogen bulb 34 disposed behind the rear focal point of the projection lens 32, and the halogen lamp 34. A reflector 36 that reflects light from the bulb 34 toward the projection lens 32 toward the optical axis Ax2, and a shade 38 that shields part of the reflected light from the reflector 36 between the reflector 36 and the projection lens 32. The projector-type lamp unit is provided.

  The eight third lamp units 40A to 40H are arranged at substantially equal angular intervals in the circumferential direction so as to surround the second lamp unit 30, and all have the same lamp configuration. Each of the third lamp units 40A to 40H includes a projection lens 42 disposed on an optical axis Ax3 extending in the vehicle front-rear direction, and a blue light emitting diode 44 disposed in the vicinity of the rear focal point of the projection lens 42. It is configured as a direct-lighting lamp unit. And each of these 3rd lamp units 40A-40H is arrange | positioned in the state which made the direction of the optical axis Ax3 face a mutually different direction.

  FIG. 2A shows a low beam light distribution pattern PL1 and a lane mark irradiation light distribution formed on a virtual vertical screen disposed at a position 25 m ahead of the lamp by the light irradiated forward from the vehicular illumination lamp 10. It is a figure which shows pattern PA1 transparently.

  In FIG. 2 (a), it is assumed that the vehicular illumination lamp 10 is arranged at the left and right center of the own vehicle traveling lane on the left-handed straight road of one lane on one side, and the vehicle front road surface and the low beam light distribution pattern. PL1 and lane mark irradiation light distribution pattern PA1 are shown. In this state, the lane mark LM1 on the shoulder side of the own lane located on the left side of the own vehicle lane and the lane mark LM2 on the center line located on the right side of the own vehicle lane are vanishing points in the front direction of the lamp. The lane mark LM3 on the opposite side of the opposite lane extends at an angle that is substantially horizontal compared to the lane mark LM2 on the opposite side of the lane. It extends.

  As shown in FIG. 2A, the low beam light distribution pattern PL1 is a left light distribution pattern, and has horizontal cut-off lines CL1 and CL2 with different left and right steps at the upper edge. These horizontal cut-off lines CL1 and CL2 extend in the horizontal direction at the left and right steps with the VV line passing through the HV, which is a vanishing point in the front direction of the lamp, in the vertical direction, and are on the right side of the VV line. The opposite lane side portion is formed as a horizontal cut-off line CL1 on the lower stage side, and the own lane side portion on the left side of the VV line is formed as a horizontal cut-off line CL2 on the upper stage side. At this time, the right end portion of the upper horizontal cut-off line CL2 is formed as an oblique cut-off line, and this oblique cut-off line is connected to the lower horizontal cut-off line CL1 along the line V-V. In this low beam light distribution pattern PL1, an elbow point E, which is the intersection of the lower horizontal cut-off line CL1 and the VV line, is located about 0.5 to 0.6 ° below HV. .

  The low beam light distribution pattern PL1 is formed by white light emitted from the second lamp unit 30 using the halogen bulb 34 as a light source. The halogen bulb 34 has a color of the emitted light as compared with a discharge bulb or the like. Since the temperature is low, the light distribution pattern is slightly yellowish.

  On the other hand, the lane mark irradiation light distribution pattern PA1 includes four light distribution patterns formed by irradiation light from the four third lamp units 40A, 40B, 40C, and 40D among the eight third lamp units 40A to 40H. It is composed of PA1A, PA1B, PA1C, and PA1D. At this time, each of the light distribution patterns PA1A, PA1B, PA1C, and PA1D is formed as a horizontally elongated spot-shaped light distribution pattern.

  In this lane mark illumination light distribution pattern PA1, the two light distribution patterns PA1A and PA1B are formed on the left side of the VV line, and the remaining two light distribution patterns PA1C and PA1D are more than the VV line. It is formed on the right side.

  At this time, the light distribution pattern PA1A is formed so as not to protrude upward from the upper horizontal cut-off line CL2 in the vicinity of the lower left of the elbow point E. Further, the light distribution pattern PA1B is formed so as to partially overlap with the light distribution pattern PA1A in the vicinity of the diagonally lower left portion. Then, the lane mark LM1 on the shoulder side of the own lane is irradiated by these two light distribution patterns PA1A and PA1B.

  On the other hand, the light distribution pattern PA1C is formed in the vicinity of the lower right side of the elbow point E so as not to protrude upward from the lower horizontal cut-off line CL1. Further, the light distribution pattern PA1D is formed so as to partially overlap with the light distribution pattern PA1C in the vicinity of the lower right portion of the light distribution pattern PA1C. Then, the center line lane mark LM2 is irradiated by these two light distribution patterns PA1C and PA1D.

  Each of these light distribution patterns PA1A, PA1B, PA1C, PA1D is formed as a blue light distribution pattern by the irradiation light from each of the third lamp units 40A, 40B, 40C, 40D using the blue light emitting diode 44 as a light source. The lane mark irradiation light distribution pattern PA1 is also formed as a blue light distribution pattern.

  FIG. 2B shows a low beam light distribution pattern PL1 and a lane mark irradiation light distribution pattern PA2 formed on the virtual vertical screen from the vehicle illumination lamp 10 in a state where the vehicle is traveling on a straight road. It is a figure shown transparently.

  This lane mark irradiation light distribution pattern PA2 is a light distribution pattern formed by adding two light distribution patterns PA2E and PA2F to the lane mark irradiation light distribution pattern PA1 shown in FIG. ing.

  These two light distribution patterns PA2E and PA2F are light distribution patterns formed by irradiation light from the other two third lamp units 40E and 40F. Each of these light distribution patterns PA2E and PA2 is formed in the same shape as each of the light distribution patterns PA1A to PA1D.

  At this time, the light distribution pattern PA2E is formed so as to partially overlap with the light distribution pattern PA1A and partially overlap with the light distribution pattern PA1B at a position shifted to the road shoulder side with respect to the light distribution pattern PA1A. Has been. Then, by additionally forming the light distribution pattern PA2E, the lane mark LM1 on the shoulder side of the own lane is irradiated more brightly.

  On the other hand, the light distribution pattern PA2F is formed so as to partially overlap the light distribution pattern PA1C and partially overlap the light distribution pattern PA1D at a position shifted to the opposite lane side with respect to the light distribution pattern PA1C. Has been. By additionally forming the light distribution pattern PA2F, the lane mark LM2 on the center line is irradiated more brightly, and the lane mark LM3 on the shoulder side of the opposite lane is also irradiated.

  These light distribution patterns PA2E and PA2F are additionally formed as blue light distribution patterns by the irradiation light from the third lamp units 40E and 40F using the blue light emitting diode 44 as a light source. PA2 is also formed as a blue light distribution pattern.

  FIG. 3A shows a low beam light distribution pattern PL1 and lane mark irradiation formed on the virtual vertical screen from the vehicle illumination lamp 10 in a state where the vehicle is traveling on a left curved road curved to the left. It is a figure which shows light distribution pattern PA2 transparently.

  In this lane mark irradiation light distribution pattern PA2, the light distribution pattern PA2E is additionally formed with respect to the lane mark irradiation light distribution pattern PA1 shown in FIG. It is possible to irradiate the lane mark LM1 on the shoulder side of the own lane, which is greatly bent, toward the farther.

  FIG. 3B shows a low-beam light distribution pattern PL1 and lane mark irradiation formed on the virtual vertical screen from the vehicle illumination lamp 10 in a state where the vehicle is traveling on a right curved road curved to the right. It is a figure which shows light distribution pattern PA3 transparently.

  The light distribution pattern PA3 for lane mark irradiation is a light distribution pattern formed by further adding two light distribution patterns PA3G and PA3H to the light distribution pattern PA2 for lane mark irradiation shown in FIG. It has become.

  These two light distribution patterns PA3G and PA3H are light distribution patterns formed by irradiation light from the remaining two third lamp units 40G and 40H, and the horizontal cut-off line CL1 on the lower stage side (that is, the opposite lane side) is used. It is formed so as to straddle up and down. Each of these light distribution patterns PA3G and PA3H is formed in the same shape as each of the light distribution patterns PA1A to PA1F.

  At this time, the light distribution pattern PA3G is formed so as to partially overlap the light distribution pattern PA1C and partially overlap the light distribution pattern PA2F at a position closer to the elbow point E than the light distribution pattern PA1A. Has been. Further, by additionally forming the light distribution pattern PA3G, it is possible to irradiate the lane mark LM1 on the shoulder side of the own lane and the lane mark LM2 on the center line that are greatly bent to the right along the right curved road to a farther distance. It has become.

  Further, the light distribution pattern PA3H partially overlaps the light distribution pattern PA3G and partially overlaps the light distribution patterns PA1C and PA2F at a position shifted to the opposite lane side with respect to the light distribution pattern PA3G. Is formed. Then, by additionally forming this light distribution pattern PA3H, the lane mark LM1 on the shoulder side of the own lane and the lane mark LM2 on the center line, and further the lane mark LM3 on the shoulder side of the opposite lane, which are largely bent to the right along the right curved road. It is possible to irradiate brightly far away.

  Each of these light distribution patterns PA3G and PA3H is additionally formed as a blue light distribution pattern by irradiation light from each of the third lamp units 40G and 40H using the blue light emitting diode 44 as a light source. PA3 is also formed as a blue light distribution pattern.

  However, in order to prevent glare from being given to the oncoming vehicle driver by adding these light distribution patterns PA3G and PA3H, the brightness of the irradiation light from the third lamp units 40G and 40H has a constant value. The following values are adjusted.

  Since each of the light distribution patterns PA1, PA2, PA3 for lane mark irradiation is formed so as to overlap the light distribution pattern PL1 for low beam, the overlapping portion with the light distribution pattern PL1 for low beam has a slightly yellowish white color. The light distribution pattern is a mixture of blue and blue, but if this overlap results in a purple light distribution pattern at the overlapping part, the driver will feel uncomfortable. .

  FIG. 4 is a CIExy chromaticity diagram for explaining the operation of the present embodiment.

  A region Zp indicated by a mesh line in the figure is a purple chromaticity range that gives a sense of discomfort to the vehicle driver.

This purple chromaticity range Zp is
y <0.5x + 0.05
y <2x-0.3
y <-0.93831x + 0.625325
Stipulated in

  As shown in the figure, in the CIExy chromaticity diagram, the chromaticity [x1, y1] of white light emitted from the second lamp unit 30 using the halogen bulb 34 as a light source is [x1, y1] = [0 .42, 0.40], on the other hand, the chromaticity [x2, y2] of the blue light emitted from each of the third lamp units 40A to 40H using the blue light emitting diode 44 as a light source is [x2, y2] = value in the vicinity of [0.12, 0.19], and the dominant wavelength λd is a value in the vicinity of 482 nm. At this time, a straight line L1 connecting the chromaticity [x1, y1] = [0.42, 0.40] of white light and the chromaticity [x2, y2] = [0.12, 0.19] of blue light is , Passing outside the purple chromaticity range Zp.

  In the present embodiment, the blue light emitting diode 44 is selected so that blue light of such chromaticity is emitted from each of the third lamp units 40A to 40H.

  In the figure, as shown in <Comparative Example>, when a general blue light emitting diode is used, the chromaticity [x2, y2] of blue light emitted from each of the third lamp units 40A to 40H Is a value in the vicinity of [x2, y2] = [0.15, 0.03], and the dominant wavelength λd is a value in the vicinity of 450 nm. When such a blue light emitting diode is used, the chromaticity [x1, y1] of white light = [0.42, 0.40] and the chromaticity of blue light [x2, y2] = [0.15, 0.03] passes through the purple chromaticity range Zp, so that each lane mark illumination light distribution pattern PA1, PA2, PA3 is formed so as to overlap the low beam light distribution pattern PL1. This may result in a purple light distribution pattern, which may cause the driver of the vehicle to feel uncomfortable.

  Next, the effect of this embodiment is demonstrated.

  The vehicular illumination lamp 10 according to the present embodiment has a configuration in which the lane mark illumination light distribution pattern PA1 can be formed in a superimposed manner on the low beam light distribution pattern PL1. A second lamp unit 30 as a first optical system for irradiating white light for forming the pattern PL1 to the front of the lamp and a blue light for forming the lane mark irradiation light distribution pattern PA1 for the front of the lamp. Since the configuration includes the four third lamp units 40A, 40B, 40C, and 40D as the second optical system, the following operational effects can be obtained.

  That is, as in the vehicular illumination lamp 10 according to the present embodiment, the low beam distribution pattern PL1 is formed by the white light emitted from the second lamp unit 30 to the front of the lamp. The visibility of the lane marks LM1 and LM2 can be improved by forming the lane mark irradiation light distribution pattern PA1 with the blue light emitted forward from the lamp units 40A, 40B, 40C, and 40D.

At that time, in the vehicular illumination lamp 10 according to the present embodiment, on the CIExy chromaticity diagram, the chromaticity [x1, y1] of the white light emitted from the second lamp unit 30 and each third lamp unit 40A. , 40B, 40C, 40D, the straight line L1 connecting the chromaticity [x2, y2] of the blue light emitted from the
y <0.5x + 0.05
y <2x-0.3
y <-0.93831x + 0.625325
The dominant wavelength λd of the blue light emitted from each of the third lamp units 40A, 40B, 40C, 40D is set to a value in the vicinity of λd = 482 nm so as to be out of the purple chromaticity range Zp defined in FIG. When the lane mark irradiation light distribution pattern PA1 is formed so as to overlap the low beam light distribution pattern PL1, it is possible to prevent generation of purple irradiation light. Accordingly, it is possible to eliminate the possibility that the driver of the vehicle will feel uncomfortable, thereby maintaining the visibility of the lane marks LM1 and LM2 in a good state.

  As described above, according to the present embodiment, the lane mark LM1, the lane mark LM1, the lane mark illumination light distribution pattern PA1 configured to be able to be superimposed on the low beam light distribution pattern PL1. The visibility of LM2 can be sufficiently increased.

  In addition, in the present embodiment, the lower blue light distribution pattern PL1 is irradiated with the same blue light as the blue light emitted from the third lamp units 40A, 40B, 40C, and 40D in the vicinity of the lower part of the horizontal cutoff lines CL1 and CL2. Since the two third lamp units 40E and 40F are provided (that is, the third lamp unit 40F constitutes the third optical system), the following operational effects can be obtained.

  That is, by additionally lighting these two third lamp units 40E and 40F, it is possible to form a lane mark irradiation light distribution pattern PA2 in which the lane mark irradiation light distribution pattern PA1 is expanded upward in the left and right sides. Thus, the visibility of the lane marks LM1 and LM2 is not only when traveling on a straight road but also when traveling on a curved road or near the end point of a downhill. Can be increased.

  Furthermore, in the present embodiment, two third lamp units 40G as a third optical system for irradiating the blue light so as to straddle the horizontal cutoff line CL1 on the opposite lane side in the low beam light distribution pattern PL1; Since it is the structure provided with 40H, the following effects can be obtained.

  That is, by additionally lighting these two third lamp units 40G and 40H, it is possible to form a lane mark irradiation light distribution pattern PA3 in which the lane mark irradiation light distribution pattern PA2 is further expanded to the upper right. Thus, the visibility of the lane marks LM1, LM2 when traveling on a right curved road can be further enhanced. Note that the blue light emitted from each of the third lamp units 40G and 40H has visibility of the lane marks LM1 and LM2 even if the brightness does not give glare to the oncoming vehicle driver. Can be sufficiently increased.

  In the present embodiment, the light distribution patterns for lane mark irradiation PA1, PA2, and PA3 may be always formed in a superimposed manner when the low beam light distribution pattern PL1 is formed, or the lane marks LM1, It may be formed so as to be superimposed only when it is necessary to improve the visibility of the LM2.

  In the above embodiment, the eight light distribution patterns PA1A to PA3H have been described as being formed in the same shape, but it is of course possible to have a configuration in which they are formed in different shapes.

  In the embodiment described above, the dominant wavelength λd of the blue light emitted from each of the third lamp units 40A to 40H has been described as being set to a value in the vicinity of λd = 482 nm. However, the dominant wavelength λd is λd = 470. If it is set to a value in the range of ˜500 nm, it is possible to irradiate blue light that does not become purple due to color mixing with white light.

  In the above embodiment, the light distribution patterns for lane mark irradiation PA1, PA2, and PA3 have been described as being superimposed when the low beam light distribution pattern PL1 is formed. It is also possible to have a configuration in which they are formed in a superimposed manner.

  In the above-described embodiment, the case where the vehicular illumination lamp 10 is a headlamp provided at the left front end portion of the vehicle has been described. Can be obtained.

  In the above-described embodiment, the configuration of the vehicular illumination lamp 10 used for left-hand traffic has been described. However, if the vehicular illumination lamp 10 has a bilaterally symmetric configuration, it may be suitable for right-hand traffic. it can.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG. 5 is a front view showing the vehicular illumination lamp 110 according to this modification.

  As shown in the figure, the basic configuration of the vehicular illumination lamp 110 according to this modification is the same as that of the vehicular illumination lamp 10 of the above-described embodiment, but the configuration of the second lamp unit 130 is the above-described implementation. It differs from the case of form, and in this modification, it has composition which is not provided with eight 3rd lamp units 40A-40H like the above-mentioned embodiment.

  The second lamp unit 130 of this modification is a halogen bulb 132 as a white light source disposed on an optical axis Ax4 extending in the vehicle front-rear direction, and a reflection optical system that reflects light from the halogen bulb 132 forward. This is configured as a parabolic lamp unit including a reflector 134.

  The reflector 134 in the second lamp unit 130 is formed with a plurality of reflecting elements 134 s on the reflecting surface 134 a for diffusing, deflecting and reflecting the light from the halogen bulb 132 forward.

  The reflecting surface 134a is subjected to mirror finishing by aluminum vapor deposition, and the region located above the optical axis Ax4 on the reflecting surface 134a is formed as a blue reflective region 134a1 to which blue vapor deposition is performed. This constitutes the second optical system. In the blue reflective region 134a1, four reflective elements 134s1, 134s2, 134s3, and 134s are formed.

  FIG. 6 is a perspective view of the low beam light distribution pattern PL2 and the lane mark irradiation light distribution pattern PB formed on the virtual vertical screen by the light irradiated forward from the vehicular illumination lamp 110. It is the same figure as a).

  The low-beam light distribution pattern PL2 is a low-beam light distribution pattern of left light distribution, and has a cut-off line including a horizontal cut-off line CL3 and an oblique cut-off line CL4 at the upper end edge. At that time, the horizontal cut-off line CL3 is formed on the opposite lane side with respect to the VV line, while the oblique cut-off line CL4 is from the intersection of the horizontal cut-off line CL3 and the VV line to the own lane side. It is formed so as to rise obliquely upward (for example, rise at 15 °). And the elbow point E which is the intersection of the horizontal cut-off line CL3 and the oblique cut-off line CL4 is located about 0.5 to 0.6 ° below HV.

  Since the low-beam light distribution pattern PL2 is formed by the irradiation light from the second lamp unit 130 using the halogen bulb 132 as a light source, it has substantially the same color as the white light irradiated from the second lamp unit 30 of the above embodiment. It is formed by irradiation light of degree [x1, y1] (= value near [0.42, 0.40]).

  On the other hand, the light distribution pattern PB for lane mark irradiation is formed by reflected light from the blue reflection region 134a1 on the reflection surface 134a of the reflector 134 as a part of the light distribution pattern PL2 for low beam.

  In other words, the light distribution pattern PB for lane mark irradiation has four slightly horizontally elongated spot-like light distributions formed by irradiation light from the four reflection elements 134s1, 134s2, 134s3, and 134s4 located in the blue reflection region 134a1. It consists of patterns PB1, PB2, PB3, and PB4.

  At that time, the two light distribution patterns PB1 and PB2 are formed so as to partially overlap each other along the lane mark LM1 on the shoulder side of the own lane, and the remaining two light distribution patterns PB3 and PB4 are They are formed so as to partially overlap each other along the lane mark LM2 of the center line.

  Since each of these light distribution patterns PB1, PB2, PB3, and PB4 is formed by reflected light from the blue reflective region 134a1 that has been subjected to blue deposition, the lane mark irradiation light distribution pattern PB is also a blue light distribution pattern. Will be formed.

  At that time, the chromaticity [x2, y2] of the blue light reflected from the blue reflecting region 134a1 is irradiated from each of the third lamp units 40A to 40H in the above embodiment on the CIExy chromaticity diagram shown in FIG. The hue of blue vapor deposition applied to the blue reflective region 134a1 is set so as to be approximately the same value as the chromaticity [x2, y2] of blue light (= values in the vicinity of [0.12, 0.19]). ing.

  Even when the configuration of this modification is employed, the chromaticity [x1, y1] of white light reflected from the region other than the blue reflection region 134a1 on the reflection surface 134a of the reflector 134 on the CIExy chromaticity diagram, and blue The dominant wavelength λd of the blue light reflected from the blue reflection region 134a1 so that the straight line L1 connecting the chromaticity [x2, y2] of the blue light reflected from the reflection region 134a1 is out of the purple chromaticity range Zp. Therefore, when the lane mark irradiation light distribution pattern PB is formed as a part of the low beam light distribution pattern PL2, generation of purple irradiation light can be prevented in advance. Accordingly, it is possible to eliminate the possibility that the driver of the vehicle will feel uncomfortable, thereby maintaining the visibility of the lane marks LM1 and LM2 in a good state.

  Next, a second modification of the above embodiment will be described.

  FIG. 7 is a plan sectional view showing the second lamp unit 230 of the vehicular illumination lamp according to this modification.

  As shown in the figure, the second lamp unit 230 of the present modification is configured as a projector-type lamp unit like the second lamp unit 30 of the above embodiment, but the light source is a white light emitting diode 234. In the case of the above-described embodiment, the shade 238 that is configured and has a configuration in which the shade 238 that shields a part of the reflected light from the reflector 236 includes an upward reflecting surface 238a extending rearward from the upper end edge thereof. Is different.

  And in this 2nd lamp unit 230, the mirror surface process by aluminum vapor deposition is given to the upward reflective surface 238a of the shade 238. FIG. At this time, a pair of left and right regions apart from the optical axis Ax5 on the reflective surface 238a on the left and right sides are formed as blue reflective regions 238a1 and 238a2 on which blue deposition is performed, and thereby the second optical system. Is configured.

  In the second lamp unit 230, a part of the light from the white light emitting diode 234 reflected by the reflector 236 directly reaches the projection lens 232, and the rest is reflected upward by the upward reflecting surface 238 a of the shade 238. The projection lens 232 is reached.

  FIG. 8 is a perspective view of the low beam light distribution pattern PL3 and the lane mark irradiation light distribution pattern PC formed on the virtual vertical screen by the light irradiated forward from the vehicular illumination lamp according to this modification. FIG. 3 is a view similar to FIG.

  The low beam light distribution pattern PL3 is formed in a shape substantially the same as the low beam light distribution pattern PL1 shown in FIG.

  The lane mark illumination light distribution pattern PC is reflected upward by the two blue reflection areas 238a1 and 238a2 on the upward reflection surface 238a of the shade 238 as a part of the low beam light distribution pattern PL3 and then reaches the projection lens 232. The light distribution patterns PC1 and PC2 are formed by two slightly horizontally elongated substantially spot-like light distribution patterns.

  At that time, one light distribution pattern PC1 is formed so as to be positioned at the lane mark LM1 on the shoulder side of the own lane by the reflected light from the blue reflection region 238a1 positioned on the right side, and the other light distribution pattern The PC 2 is formed so as to be positioned at the lane mark LM2 of the center line by the reflected light from the blue reflection region 238a2 positioned on the left side.

  Since each of these light distribution patterns PC1 and PC2 is formed by reflected light from each of the blue reflective regions 238a1 and 238a2 subjected to blue vapor deposition, the lane mark irradiation light distribution pattern PC is also formed as a blue light distribution pattern. Will be.

  At that time, the chromaticity [x2, y2] of the blue light reflected from the blue reflection regions 238a1, 238a2 is determined from the third lamp units 40A to 40H in the above embodiment on the CIExy chromaticity diagram shown in FIG. The blue color applied to each of the blue reflection regions 238a1, 238a2 so as to be substantially the same value as the chromaticity [x2, y2] (= value near [0.12, 0.19]) of the irradiated blue light. The hue of vapor deposition is set.

  On the other hand, since the light source of the second lamp unit 230 of the present modification is configured by the white light emitting diode 234, the reflected light from the reflector 236 that has directly reached the projection lens 232 and the upward reflecting surface 238a in the shade 238 are excluded. The chromaticity [x1, y1] of the white light that has reached the projection lens 232 after being reflected upward in the region is a value in the vicinity of [x1, y1] = [0.35, 0.37].

  In addition, in the same figure, when the general blue light emitting diode shown by <comparative example> is used, chromaticity [x1, y1] = [0.35, 0.37] of white light and the color of blue light Since the straight line L2 ′ connecting degrees [x2, y2] = [0.15, 0.03] passes through the purple chromaticity range Zp, the lane mark illumination light distribution pattern PC becomes the low beam light distribution pattern PL3. When formed so as to overlap, there is a possibility of a purple light distribution pattern, which may cause a sense of discomfort to the driver of the vehicle.

  On the other hand, when the configuration of the present modification is employed, the reflected light from the reflector 236 that directly reaches the projection lens 232 on the CIExy chromaticity diagram and each blue reflection region 238a1 on the upward reflecting surface 238a of the shade 238. Chromaticity [x1, y1] of white light that has reached the projection lens 232 after being reflected upward in a region other than 238a2, and blue light that has reached the projection lens 232 after being reflected by the blue reflection regions 238a1, 238a2 The dominant wavelength λd of the blue light reflected from the blue reflection regions 238a1 and 238a is set so that the straight line L2 connecting the chromaticity [x2, y2] of the blue color is out of the purple chromaticity range Zp. When the lane mark illumination light distribution pattern PC is formed as a part of the low beam light distribution pattern PL2, the purple illumination From light from being generated can be prevented. Accordingly, it is possible to eliminate the possibility that the driver of the vehicle will feel uncomfortable, thereby maintaining the visibility of the lane marks LM1 and LM2 in a good state.

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

DESCRIPTION OF SYMBOLS 10,110 Vehicle lighting lamp 12 Lamp body 14 Translucent cover 20 1st lamp unit 22,34,132 Halogen bulb 24,36,134,236 Reflector 30,130,230 2nd lamp unit 32,42,232 Projection lens 38, 238 Shade 40A, 40B, 40C, 40D, 40E, 40F, 40G, 40H Third lamp unit 44 Blue light emitting diode 134a Reflecting surface 134a1, 238a1, 238a2 Blue reflecting area 134s, 134s1, 134s2, 134s3, 134s4 Reflecting element 234 White light emitting diode 238a Upward reflecting surface Ax1, Ax2, Ax3, Ax4, Ax5 Optical axes CL1, CL2, CL3 Horizontal cut-off line CL4 Oblique cut-off line E Elbow point L1, L2 Straight line LM1 Self Lane mark on the shoulder side of the lane LM2 Lane mark on the center line LM3 Lane mark on the shoulder side of the opposite lane PA1, PA2, PA3, PB, PC Light distribution pattern for lane mark irradiation PA1A, PA1B, PA1C, PA1D, PA2E, PA2F, PA3G, PA3H, PB1, PB2, PB3, PB4, PC1, PC2 Light distribution pattern PL1, PL2, PL3 Low beam light distribution pattern Zp Purple chromaticity range

Claims (3)

In the vehicular illumination lamp configured to be able to overlap the light distribution pattern for lane mark irradiation with the light distribution pattern for low beam,
A first optical system that irradiates the front of the lamp with white light for forming the light distribution pattern for low beam, and a second optical system that irradiates the front of the lamp with blue light for forming the light distribution pattern for lane mark irradiation. With an optical system,
On the CIExy chromaticity diagram, chromaticity [x1, y1] of white light emitted from the first optical system, and chromaticity [x2, y2] of blue light emitted from the second optical system, and A straight line connecting
y <0.5x + 0.05
y <2x-0.3
y <-0.93831x + 0.625325
The dominant light λd of the blue light emitted from the second optical system is set so as to pass outside the purple chromaticity range defined in 1. above.   The vehicular illumination lamp according to claim 1, further comprising a third optical system for irradiating the blue light in a region near a horizontal cutoff line on the opposite lane side in the low beam light distribution pattern. The first optical system includes a white light source and a reflective optical system that reflects light from the white light source toward the front of the lamp,
3. The vehicular illumination lamp according to claim 1, wherein the second optical system is configured by coloring a reflecting surface constituting a part of the reflecting optical system in blue. 4.

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