JP2005014691A - Lighting device for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a sufficient attention to be given to a driver of a vehicle at an opposite lane or a walking person and the like through this lighting device for vehicles constructed to radiate light toward a forward location of a vehicle during running at a day time. <P>SOLUTION: This lighting device 10 for a vehicle is constructed in such a way that it may form a light distributing pattern P having at least two high lumen regions HZ within an angular range of each of the right and left regions by 20° and each of upper and lower regions by 10° in regard to a front surface direction of the vehicle. With this arrangement, the light distributing pattern P is set to have a valley of lightness within a predetermined angular range around a center of the front surface direction of the vehicle and light entering into a field of sight of a driver of a vehicle at an opposing lane or a walking person and the like is set once dark as the driver's vehicle moves and again made bright. With this operation, a brilliant feeling is given to the driver of the vehicle at the opposing lane or the walking person and the like to cause a sufficient attention to be generated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular lamp configured to emit light toward the front of the vehicle during daytime running.
[0002]
[Prior art]
In recent years, not only two-wheeled vehicles but also four-wheeled vehicles have increased in number of vehicles that run with the headlamps lit during daytime running. This is intended to further increase driving safety by notifying the driver of an oncoming vehicle, a pedestrian, or the like of the vehicle by turning on the headlamp.
[0003]
In this case, “Patent Document 1” describes a control device for setting the brightness according to the ambient brightness when the headlamp is used for daytime lighting.
A dedicated vehicular lamp configured to emit light toward the front of the vehicle during daytime running is also commercially available.
[0004]
[Patent Document 1]
JP 2001-347880 A [Problem to be Solved by the Invention]
Since such daytime lighting lamps are intended to increase the visibility of the host vehicle, the light irradiation can be configured to urge the oncoming driver or pedestrian as strongly as possible. It is desirable to do.
[0005]
However, since the light distribution pattern formed by light irradiation from the conventional daytime lighting lamp is a light distribution pattern having a single high intensity area as in the case of a normal headlamp, the oncoming vehicle driver There is a problem that the alerting action for pedestrians and the like is not sufficient, and thus the visibility of the own vehicle cannot be effectively increased.
[0006]
The present invention has been made in view of such circumstances, and in a vehicular lamp configured to irradiate light toward the front of the vehicle during daytime driving, for an oncoming vehicle driver, a pedestrian, etc. An object of the present invention is to provide a vehicular lamp that can prompt sufficient attention.
[0007]
[Means for Solving the Problems]
The present invention is intended to achieve the above object by devising a method for forming a light distribution pattern.
[0008]
That is, the vehicular lamp according to the present invention is
In the vehicular lamp configured to emit light toward the front of the vehicle during daytime driving,
The light irradiation is configured to form a light distribution pattern having at least two high light intensity regions within an angular range of 20 ° left and right and 10 ° up and down with respect to the front direction of the vehicle. To do.
[0009]
As long as the “vehicle lamp” is configured to emit light toward the front of the vehicle during daytime running, the specific configuration, the mounting position on the vehicle, and the like are not particularly limited.
[0010]
As long as the “light distribution pattern” has at least two high luminous intensity regions, the specific configuration such as the maximum luminous intensity and the pattern shape is not particularly limited.
[0011]
[Effects of the invention]
As shown in the above configuration, the vehicular lamp according to the present invention is configured to emit light toward the front of the vehicle during daytime running. Since the light distribution pattern having at least two high luminous intensity regions is formed within the angular ranges of ° and 10 ° above and below, the following operational effects can be obtained.
[0012]
That is, the light distribution pattern formed by light irradiation from the vehicular lamp according to the present invention has a valley of brightness within a predetermined angle range centered on the front direction of the vehicle. The light entering the field of view of the person or the like can be made to become brighter again after being darkened once with the movement of the own vehicle. For this reason, it is possible to give a so-called sparkle feeling to the oncoming vehicle driver, pedestrians, and the like, thereby prompting sufficient attention.
[0013]
As described above, according to the present invention, in the vehicular lamp configured to irradiate light toward the front of the vehicle during daytime driving, it is possible to urge the oncoming driver, pedestrian, and the like to be sufficiently alerted. Thus, the visibility of the own vehicle can be effectively increased.
[0014]
In the above configuration, the difference in luminous intensity between the lowest luminous intensity point on the line connecting the highest luminous intensity points of the two high luminous intensity areas and the highest luminous intensity point with the lower luminous intensity of the two luminous intensity points is the highest in the lower luminous intensity. By setting the value to be 20% or more with respect to the light intensity at the light intensity point, it is possible to increase the difference in brightness of light entering the field of view of an oncoming driver or pedestrian as the vehicle moves. Glittering feeling can be enhanced, and thereby the alerting action can be further enhanced.
[0015]
At that time, if it is configured such that at least one minimum luminous intensity point that satisfies the above-mentioned difference in luminous intensity exists on the extension line of the line connecting the two highest luminous intensity points, the glittering feeling can be further enhanced. The alerting action can be further enhanced.
[0016]
Further, if it is configured such that at least one lowest light intensity point that satisfies the above light intensity difference condition exists on a straight line orthogonal to a straight line connecting the two highest light intensity points, an oncoming vehicle driver, a pedestrian, etc. and a vehicle lamp The light that enters the field of view of an oncoming vehicle driver or pedestrian, etc., once darkens with the movement of the vehicle, and then becomes brighter again when the positional relationship with the vehicle changes in any direction. Therefore, it is possible to more surely give a glittering feeling, thereby further enhancing the alerting action.
[0017]
The specific value of the maximum luminous intensity of the light distribution pattern is not particularly limited. However, if this value is set to a value of 300 cd or less, the power consumption of the vehicular lamp can be suppressed to a small value. It can be lit in the daytime without imposing an excessive burden on etc.
[0018]
Moreover, even when the light source for performing the light irradiation is configured by a plurality of semiconductor light emitting elements, the power consumption of the vehicular lamp can be kept small, thereby overloading the battery power source and the like. It can be lit in the daytime without putting on.
[0019]
At this time, if a convex lens is provided in front of the plurality of semiconductor light emitting elements, the divergent light from each semiconductor light emitting element can be made to be parallel light or close to it. It can be formed easily.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a front view showing a vehicular lamp according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
[0022]
As shown in these drawings, the vehicular lamp 10 according to the present embodiment is a so-called daytime running lamp configured to irradiate light toward the front of the vehicle during daytime running, and in the vehicle front-rear direction. It has an extending optical axis Ax. The vehicular lamp 10 includes 15 semiconductor light emitting elements 12 as light sources, a substrate 14 to which the semiconductor light emitting elements 12 are attached, and 15 semiconductor light emitting elements so as to be positioned on the optical axis Ax. 12, a convex lens 16 provided in the vicinity of the front, a holder 18 and a spacer 20 for holding the semiconductor light emitting element 12 and the convex lens 14 in a predetermined positional relationship, and a state fixed to the rear end of the holder 18. While holding the board | substrate 14, it has the fixed plate 22 by which the heat radiating fin 22a was formed in the rear surface.
[0023]
The fifteen semiconductor light emitting elements 12 include three semiconductor light emitting elements arranged at equal intervals on the optical axis Ax and at two positions above and below the optical axis Ax, and equal intervals with respect to these three semiconductor light emitting elements. And six semiconductor light emitting elements disposed obliquely below and to the left and right at equal intervals with respect to these six semiconductor light emitting elements. ing.
[0024]
Each of these semiconductor light emitting elements 12 is a light emitting diode that emits white light. A light emitting chip 12a is embedded in a shell-shaped mold resin 12b, and is disposed toward the front of the lamp. In each of these semiconductor light emitting elements 12, the divergent light from the light emitting chip 12a is made incident on the convex lens 16 as divergent light converged slightly forward by the shell-shaped mold resin 12b.
[0025]
The convex lens 16 is a plano-convex lens having a convex front surface and a flat rear surface, and emits light from each semiconductor light emitting element 12 incident on the convex lens 16 forward as light converged toward the optical axis Ax. It is supposed to let you.
FIG. 3 is a diagram showing light emitted from the vehicular lamp 10.
[0026]
As shown in the figure, the light from each semiconductor light emitting element 12 is irradiated forward with a certain extent, but the irradiation direction varies depending on the positional relationship between each semiconductor light emitting element 12 and the optical axis Ax. It has become.
[0027]
That is, the light from the semiconductor light emitting element 12 arranged on the optical axis Ax becomes irradiation light that spreads around the optical axis Ax, and the light from the semiconductor light emitting element 12 arranged at a position slightly away from the optical axis Ax is The light emitted from the semiconductor light emitting element 12 disposed at a position far away from the optical axis Ax is a direction that is largely inclined with respect to the optical axis Ax. The irradiation light spreads around the center.
[0028]
FIG. 4 is a perspective view showing a light distribution pattern P formed on a virtual vertical screen arranged at a position 10 m ahead of the lamp by light irradiated forward from the vehicular lamp 10 according to the present embodiment. .
[0029]
As shown in the figure, this light distribution pattern P is a light distribution pattern rich in brightness and darkness having 15 high luminous intensity regions HZ within an angular range of 20 ° to the left and right and 10 ° to the top and bottom. These fifteen high luminous intensity regions HZ are formed as a reversed image of the fifteen semiconductor light emitting elements 12 in a positional relationship that substantially corresponds to the positional relationship between each semiconductor light emitting element 12 and the optical axis Ax.
5 and 6 are diagrams showing the light intensity distribution of the light distribution pattern P in the VV line cross section and the VI-VI line cross section of FIG. 4.
[0030]
As shown in FIG. 5, the light distribution pattern P has three high luminous intensity regions HZ1, HZ2, and HZ3 in the VV line cross section along the HH line. The high luminous intensity region HZ1 is located in the vicinity of HV where the highest luminous intensity point P1 is a vanishing point in the front direction of the lamp, and the high luminous intensity regions HZ2 and HZ3 are the highest luminous intensity points P2 and P3 from the HV. It is located in the vicinity of H-15L and H-15R displaced about 15 ° on the left and right respectively. In this case, the luminosities I1, I2, and I3 of these three highest luminosity points P1, P2, and P3 all have substantially the same values, but the following description will be made assuming that I1> I2 and I1> I3.
[0031]
A valley of brightness is formed between the high luminous intensity area HZ1 and the high luminous intensity area HZ2, and the highest luminous intensity point P2 having the lower luminous intensity among the highest luminous intensity points P1 and P2, and both highest luminous intensity points P1, The luminous intensity difference G1 with the lowest luminous intensity point B1 on the line segment connecting P2 is set to be 20% or more (that is, G1 ≧ 0.2 × I2) with respect to the luminous intensity I2 of the highest luminous intensity point P2. Yes.
[0032]
Similarly, a valley of brightness is also formed between the high luminous intensity region HZ1 and the high luminous intensity region HZ3. Among the highest luminous intensity points P1 and P3, the highest luminous intensity point P3 having the lower luminous intensity and both highest luminous intensity values. The luminous intensity difference G2 with the lowest luminous intensity point B2 on the line connecting the points P1 and P3 is 20% or more with respect to the luminous intensity I3 of the highest luminous intensity point P3 (that is, G2 ≧ 0.2 × I3). Is set.
[0033]
As shown in FIG. 6, the light distribution pattern P has two high light intensity in addition to the high light intensity region HZ2 in the VI-VI line cross section passing through the highest light intensity point P2 of the high light intensity region HZ2 and orthogonal to the HH line. It has areas HZ4 and HZ5. These high luminous intensity regions HZ4 and HZ5 are located in the vicinity of 8U-15L and 8D-15L, where the highest luminous intensity points P4 and P5 are displaced by about 8 ° above and below the highest luminous intensity point P2 of the high luminous intensity region HZ2. In this case, the three highest luminous intensity points P2, P4, and P5 have the same luminous intensity I2, I4, and I5, but the following explanation will be made assuming that I2> I4 and I2> I5.
[0034]
A valley of brightness is formed between the high luminous intensity region HZ2 and the high luminous intensity region HZ4. Among the highest luminous intensity points P2 and P4, the highest luminous intensity point P4 having the lower luminous intensity and both highest luminous intensity points P2, The luminous intensity difference G3 with the lowest luminous intensity point B3 on the line segment connecting P4 is set to be 20% or more (that is, G3 ≧ 0.2 × I4) with respect to the luminous intensity I4 of the highest luminous intensity point P4. Yes.
[0035]
Similarly, a valley of brightness is also formed between the high luminous intensity region HZ2 and the high luminous intensity region HZ5. Among the highest luminous intensity points P2 and P5, the highest luminous intensity point P5 having the lower luminous intensity and both highest luminous intensity values. The luminous intensity difference G4 from the lowest luminous intensity point B4 on the line connecting the points P2 and P5 is 20% or more with respect to the luminous intensity I5 of the highest luminous intensity point P5 (that is, G4 ≧ 0.2 × I5). Is set.
[0036]
In the present embodiment, the maximum luminous intensity points of the two high luminous intensity regions are determined between the two adjacent high luminous intensity regions HZ even in the cross section other than the VV sectional line and the VI-VI sectional line. The difference in luminous intensity between the lowest luminous intensity point on the connecting line segment and the highest luminous intensity point with the lowest luminous intensity among both luminous intensity points is 20% or more with respect to the luminous intensity of the highest luminous intensity point with the lower luminous intensity. Is set to In the present embodiment, the light intensity at the highest light intensity point of the 15 high light intensity regions HZ is set to a value within the range of 30 to 50 cd. At that time, the luminous intensity of each of these maximum luminous intensity points is set to substantially the same value.
[0037]
FIG. 7 shows a light distribution pattern actually formed on a vertical screen arranged at a position 1 m ahead of the lamp by irradiation light from a prototype having the same configuration as the vehicular lamp 10 according to the present embodiment. It is a figure shown with an isoillumination curve.
[0038]
As shown in the figure, this light distribution pattern is a light distribution pattern rich in brightness and darkness having a plurality of high luminous intensity regions within an angular range of 20 ° on each side and 10 ° on each side. Note that this light distribution pattern does not clearly show 15 high luminous intensity regions HZ at regular intervals unlike the light distribution pattern P shown in FIG. This is due to the shortness of the light and the accuracy of the 15 semiconductor light emitting elements 12.
[0039]
As described above in detail, the vehicular lamp 10 according to the present embodiment is configured to emit light toward the front of the vehicle during daytime travel. Since the light distribution pattern P having 15 high luminous intensity regions HZ is formed within the angle ranges of 20 ° and 10 ° above and below, the following operational effects can be obtained.
[0040]
That is, the light distribution pattern P formed by light irradiation from the vehicular lamp 10 according to the present embodiment has a valley of brightness within a predetermined angle range centering on the front direction of the vehicle. Light that enters the field of view of a driver, a pedestrian, or the like can be once darkened and then brightened again as the vehicle moves. For this reason, it is possible to give an oncoming vehicle driver, a pedestrian, and the like a sparkling feeling to prompt sufficient attention, thereby effectively increasing the visibility of the own vehicle.
[0041]
In particular, in the present embodiment, in all of the two high light intensity regions HZ adjacent to each other, the light intensity of the lowest light intensity point on the line segment connecting the highest light intensity points of the two high light intensity regions HZ and both maximum light intensity points is Since the light intensity difference from the lower maximum light intensity point is set to a value of 20% or more with respect to the light intensity of the lower maximum light intensity point, the oncoming vehicle with the movement of the own vehicle It is possible to increase the difference in brightness of the light entering the field of view of the driver or pedestrian, etc., and the oncoming vehicle is no matter what direction the positional relationship between the oncoming vehicle driver or pedestrian and the vehicle lamp changes in any direction. Light that enters the field of view of a driver, a pedestrian, or the like can be once darkened and then brightened again as the vehicle moves. As a result, the glittering feeling can be enhanced and the glittering feeling can be given more reliably, so that the alerting action can be further enhanced.
[0042]
In the vehicular lamp 10 according to the present embodiment, the light source for performing the light irradiation includes 15 semiconductor light emitting elements 12, and the light distribution formed by the light irradiation from the vehicular lamp 10. Since the maximum luminous intensity of the pattern P is set to a value of 30 to 50 cd, the power consumption of the vehicular lamp 10 can be kept small, thereby performing daytime lighting without placing an excessive burden on the battery power source or the like. Can do.
[0043]
In the present embodiment, since the convex lens 16 is provided in front of these semiconductor light emitting elements 12, the divergent light from each semiconductor light emitting element 12 can be made parallel or close to this, thereby A plurality of high luminous intensity regions HZ can be easily formed.
[0044]
In the above embodiment, the light intensity difference between the highest light intensity point with the lower light intensity and the lowest light intensity point is set to a value of 20% or more in all the two high light intensity regions HZ adjacent to each other. Although described as a thing, even if it is a case where the one part does not satisfy | fill the conditions of the said light intensity difference, it is possible to urge an oncoming vehicle driver, a pedestrian, etc. to alert sufficiently.
[0045]
In the above embodiment, the maximum luminous intensity of the light distribution pattern P has been described as being set to a value of 30 to 50 cd. However, even if the maximum luminous intensity exceeds 50 cd, it is set to a value of 300 cd or less. If so, the power consumption of the vehicular lamp 10 can be sufficiently reduced.
[0046]
In the above embodiment, the vehicular lamp 10 has been described as including 15 semiconductor light emitting elements 12, but it is of course possible to set the number to other numbers.
[0047]
In the above embodiment, each semiconductor light emitting element 12 has been described as a light emitting diode that emits white light. However, other light emitting colors may be employed.
[0048]
Furthermore, instead of adopting a configuration in which the convex lens 16 is provided in front of the plurality of semiconductor light emitting elements 12 as in the above embodiment, the plurality of semiconductor light emitting elements 12 may be shifted slightly from each other, etc. It is possible to form the high luminous intensity region HZ.
[Brief description of the drawings]
1 is a front view showing a vehicular lamp according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a view showing irradiated light from the vehicular lamp. FIG. 5 is a perspective view showing a light distribution pattern formed on a virtual vertical screen disposed at a position 10 m ahead of the lamp by light emitted forward from the vehicle lamp. FIG. FIG. 6 is a diagram showing the luminous intensity distribution of the light distribution pattern in the cross section. FIG. 6 is a diagram showing the luminous intensity distribution of the light distribution pattern in the cross section taken along the line VI-VI in FIG. Diagram showing the light distribution pattern that is actually formed on the vertical screen placed 1m in front of the lamp by the irradiation light from the prototype that has an iso-illumination curve.
DESCRIPTION OF SYMBOLS 10 Vehicle lamp 12 Semiconductor light emitting element 12a Light emitting chip 12b Mold resin 14 Substrate 16 Convex lens 18 Holder 20 Spacer 22 Fixing plate 22a Radiation fin Ax Optical axis B1, B2, B3, B4 Minimum luminous intensity points G1, G2, G3, G4 HZ, HZ1, HZ2, HZ3, HZ4, HZ5 High luminous intensity region P Light distribution pattern P1, P2, P3, P4, P5 Maximum luminous intensity point I1, I2, I3, I4, I5 Luminous intensity

Claims (7)

In the vehicular lamp configured to emit light toward the front of the vehicle during daytime driving,
The light irradiation is configured to form a light distribution pattern having at least two high light intensity regions within an angular range of 20 ° left and right and 10 ° up and down with respect to the front direction of the vehicle. Vehicle lamp. The difference in luminous intensity between the lowest luminous intensity point on the line connecting the highest luminous intensity points of the two high luminous intensity areas and the highest luminous intensity point with the lower luminous intensity of the two luminous intensity points is the highest luminous intensity point with the lower luminous intensity. The vehicular lamp according to claim 1, wherein the vehicular lamp is set to have a value of 20% or more with respect to the luminous intensity. The vehicular lamp according to claim 2, wherein there is at least one lowest luminous intensity point that satisfies the condition of the luminous intensity difference on an extension line of a line connecting the two highest luminous intensity points. 4. The vehicular lamp according to claim 2, wherein there is at least one lowest luminous intensity point that satisfies the condition of the luminous intensity difference on a straight line orthogonal to a straight line connecting the two highest luminous intensity points. The vehicular lamp according to any one of claims 1 to 4, wherein the maximum luminous intensity of the light distribution pattern is set to a value of 300 cd or less. The vehicular lamp according to any one of claims 1 to 5, wherein the light source for performing the light irradiation includes a plurality of semiconductor light emitting elements. The vehicular lamp according to claim 6, wherein a convex lens is provided in front of the plurality of semiconductor light emitting elements.

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