JP5505777B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that uses a high-intensity discharge lamp (HID lamp) as a light source.

  Conventionally, in the field of vehicular lamps using high-intensity discharge lamps (hereinafter referred to as HID lamps), it is known that light including yellow light emitted downward from the HID lamps affects the light distribution pattern. (For example, refer to Patent Document 1, especially paragraph 0088).

  In Patent Document 1, in order to prevent the light including yellow light emitted downward from the HID lamp from affecting the light distribution pattern, the reflection that reflects the light including yellow light emitted downward from the HID lamp is reflected. As a surface, a reflective surface with a top coat made of paint mixed with a blue dye that has a complementary color to yellow is used as the surface, and it is proposed that the reflected light be almost white light by the action of this reflective surface. (See, for example, Patent Document 1, especially paragraph 0088).

JP 2005-190988 A

  However, the inventors of the present application cannot form a light distribution pattern that sufficiently matches the white chromaticity range defined by laws and regulations even when using a blue color that is complementary to yellow. 11 (a) and (b)).

  The present invention has been made in view of such circumstances, and uses a light including yellow light emitted downward from an HID lamp to provide a light distribution pattern that conforms to a white chromaticity range defined by laws and regulations. An object of the present invention is to provide a vehicular lamp that can be formed.

In order to solve the above-mentioned problem, the invention described in claim 1 is directed to a vehicle lamp that emits light for forming a predetermined light distribution pattern using light emitted from an HID lamp, above the HID lamp. An upper optical system that irradiates light for forming a first light distribution pattern using light mainly emitted from the HID lamp and emitted upward from the light emitted from the HID lamp; and A lower optical system that radiates light for forming a second light distribution pattern using light including yellow light emitted downward from the light emitted from the HID lamp; and the HID A correction optical system that irradiates light for forming a white region superimposed on a yellow colored region in the second light distribution pattern using white-based light emitted diagonally forward and upward from the lamp; The above A colored lens disposed in the irradiation direction of the optical system, and the colored lens absorbs yellow light out of the light from the HID lamp, and the predetermined light distribution pattern falls within the range of the following formula: Ri configured colored lenses der as the white region is in the range of the horizontal direction at about 0 ° to 45 ° from the vertical axis, the area colored in yellow the second light distribution pattern in the said It is narrower than the white area and is in the range of about 25 ° to 45 ° from the vertical axis in the horizontal direction, and the white area is light-distributed to illuminate the range of the yellow colored area, from the lower optical system white principal light from yellow light the correcting optical system with light including a vehicular lamp characterized comparable luminosity der Rukoto. y = 0.150 + 0.640x, y = 0.440, x = 0.500, y = 0.382, y = 0.050 + 0.750x, x = 0.310.

According to the first aspect of the invention, due to the types of HID lamps and product variations, the effect of the colored (yellow) region on the light distribution pattern is not sufficiently mitigated by the correction optical system alone, and is determined by laws and regulations. Even if it is not possible to form a light distribution pattern that fits the specified white chromaticity range, the colored lens causes the coloring to cause a significant reduction in the transmittance of yellow light that causes coloring, so that almost no colored (yellow) region appears. It is possible to form a light distribution pattern that conforms to the white chromaticity range defined by laws and regulations.

In addition, according to the first aspect of the present invention, the correction optical system is provided, and since the influence of the colored (yellow) region is alleviated to some extent by the correction optical system, the coloring lens is lightened and the transmittance is reduced. Can be improved (improvement of light utilization efficiency).

That is, according to the first aspect of the present invention, the light utilization efficiency is extremely high by combining with the correction optical system instead of simply arranging the colored lens, and the white chromaticity range defined by the law It is possible to realize a vehicular lamp that can form a composite light distribution pattern that conforms to the above.

The invention according to claim 2 is the invention according to claim 1 , wherein the colored lens has a color of 0.46267 ≦ x ≦ 0.46698 and 0.40096 ≦ y ≦ 0.40257 in the CIE chromaticity coordinates. It is a red colored lens included in the temperature range.

  This is an example of the chromaticity of the colored lens. Therefore, the colored lens may be colored with another red color. If a red colored lens is used as the colored lens, it will look red when not lit, and North American legislation (for example, North American California law stipulates that blue light cannot be used for headlamps). It is possible to configure a vehicle headlamp unit that can be used.

  According to the present invention, there is provided a vehicular lamp capable of forming a light distribution pattern that conforms to a white chromaticity range defined by laws and regulations using light including yellow light emitted downward from an HID lamp. It becomes possible to do.

The perspective view which showed the vehicle headlamp unit of embodiment 1 is a longitudinal sectional view of the vehicle headlamp unit shown in FIG. Front view of the vehicle headlamp unit shown in FIG. Right side view of the vehicle headlamp unit shown in FIG. Explanatory drawing which showed the shape of the light distribution pattern of the vehicle headlamp unit shown in FIG. Schematic cross-sectional view showing the positional relationship of the second reflecting surface FIG. 3 is a longitudinal sectional view of the vehicle headlamp unit along the line AA in FIG. FIG. 3 is a longitudinal sectional view of the vehicle headlamp unit along the line BB in FIG. It is a table | surface showing the result of having used four types of HID lamps 16, and evaluating the light distribution pattern formed by each HID lamp 16 in conformity with the white chromaticity range defined by the law. It is a figure showing that the thing which does not fit in the white chromaticity range prescribed | regulated by the law exists among four types of HID lamps 16. FIG. FIG. 11A is a diagram showing that a light distribution pattern that conforms to the white chromaticity range defined by laws and regulations cannot be formed even when a blue colored lens having a complementary color relationship with yellow is used. FIG. It is the elements on larger scale of a). It is a table | surface for demonstrating the chromaticity range of the colored lens 40 (In the table | surface, S is a median value among several measured values, U is an upper limit among several measured values, and L is several measured values. Represents the lower limit of the value). The result of measuring the transmission color of a red colored lens included in the above chromaticity range (using a spectrocolorimeter (KONICA MINOLTA CM-3700d)), the vertical axis is the transmittance, and the horizontal axis is the wavelength coordinate system It is a graph plotted in. FIG. 3 is a perspective view of a vehicle headlamp unit 10 in which a colored lens 40 is arranged in the irradiation direction of a second reflecting surface 20. FIG. 3 is a front view of a vehicle headlamp unit 10 in which a colored lens 40 is arranged in the irradiation direction of a second reflecting surface 20. It is a figure showing that it becomes possible to form the light distribution pattern which adapts to the white chromaticity range prescribed | regulated by the law | regulation, even if it uses various (or product variation) HID lamps 16. FIG. It is a table | surface for demonstrating the transmittance | permeability of the colored lens 40 (In the table | surface, S is a median value among several measured values, U is an upper limit among several measured values, and L is several measured values. Represents the lower limit). It is a figure for demonstrating the white chromaticity range defined by SAE and ECE standards.

  Hereinafter, preferred embodiments of a vehicle headlamp unit according to the present invention will be described in detail with reference to the accompanying drawings.

  1 is an overall perspective view of a vehicle headlamp unit 10 according to an embodiment, FIG. 2 is a longitudinal sectional view of the vehicle headlamp unit 10, and FIG. 3 is a front view of the vehicle headlamp unit 10. 4 is a right side view of the vehicle headlamp unit 10. The vehicle headlamp unit 10 shown in these drawings is provided in a vehicle headlamp disposed on the left side of the vehicle.

  As shown in FIG. 2, the vehicle headlamp unit 10 includes a projection lens 12, a light shielding plate 14, and an HID lamp (for example, a D2S burner) 16 from the front side to the rear side of the unit optical axis (optical axis of the projection lens 12) Ax. , And the first reflecting surface 18 is arranged. The HID lamp 16 is disposed at a position below the unit optical axis Ax by a predetermined amount, and the second reflecting surface 20 is disposed below the HID lamp 16.

  As shown in FIG. 2, the projection lens 12 is constituted by a plano-convex lens having a convex light output surface 12A and a flat light incident surface 12B. The projection lens 12 has a focal point F on the HID lamp 16 side and in the vicinity of the upper edge portion 14A of the light shielding plate 14, and projects an image on the focal plane including the focal point F forward as a reverse image. 2 denotes a lens holder that holds the projection lens 12. The lens holder 22 is formed in a cylindrical shape, and its base end is connected to the first reflecting surface 18 via the light shielding plate 14. Has been.

  The first reflective surface 18 is an elliptical reflective surface having a first focal point F1 in the vicinity of the HID lamp 16 and a second focal point F2 in the vicinity of the upper edge portion 14A of the light shielding plate 14.

  The light shielding plate 14 shields upward light from the HID lamp 16 toward the projection lens 12 in order to form a passing beam light distribution pattern, and the upper edge portion 14 </ b> A is on the long axis Z of the first reflecting surface 18. It is set to a height that is approximately touching.

  The second reflecting surface 20 is a reflecting surface that is disposed below the projection lens 12 in the horizontal direction and has a focal point F3 in the vicinity of the HID lamp 16. The second reflecting surface 20 will be described later.

  The HID lamp 16 employs a vertical filament that is inserted through a bulb insertion hole 18A formed in the rear part of the first reflecting surface 18, but is not limited to the one inserted through the bulb insertion hole 18A. The first reflective surface 18 may be integrated with the first reflective surface 18. Further, since the vehicular headlamp unit 10 is configured by attaching the light shielding plate 14, the lens holder 22, the plate 24 (see FIG. 1) and the HID lamp 16 to the first reflecting surface 18, the projection lens 12, the light shielding The positional accuracy of the plate 14, the HID lamp 16, and the first reflecting surface 18 is enhanced.

  According to the vehicle headlamp unit 10 configured in this way, when the HID lamp 16 is turned on, the high-luminance light beam emitted upward from the HID lamp 16 is reflected by the first reflecting surface 18 and secondly. A focal point is formed at the focal point F2, and the light enters the light incident surface 12B of the projection lens 12. Then, by emitting the light from the light emitting surface 12A, a known passing beam light distribution pattern A shown in FIG. 5 is formed.

  On the other hand, the high-luminance light beam irradiated downward from the HID lamp 16 in FIG. 2 is reflected forward by the second reflecting surface 20 disposed below the HID lamp 16 without being blocked by the light shielding plate 14. . Then, the reflected light is irradiated to the front of the projection lens 12 without passing through the projection lens 12, and forms a light distribution pattern B partially overlapping with the light distribution pattern A for the low beam shown in FIG. Further, in order to form the light distribution pattern B, excess light reflected upward by the second reflecting surface 20 of FIG. 1 is disposed outside the first reflecting surface 18 and above the second reflecting surface 20. The plate 24 shields it from light.

  Light distribution patterns A and B shown in FIG. 5 indicate the light distribution pattern of the left headlight of the vehicle. The light distribution pattern A mainly irradiates the left lane of the road surface, and the light distribution pattern B mainly irradiates the road side zone of the left lane.

  Thus, according to the vehicle headlamp unit 10 of the embodiment, in the vehicle headlamp unit having the projection lens 12, the light shielding plate 14, the HID lamp 16, and the first reflecting surface 18 as shown in FIG. The HID lamp 16 is disposed below the unit optical axis Ax, and the second reflecting surface 20 is provided below the HID lamp 16, and direct light emitted downward from the HID lamp 16, that is, a low beam distribution is provided. Light that is not used to form the light pattern A (see FIG. 5) is reflected by the second reflecting surface 20 to the front of the projection lens 12 without passing through the projection lens 12, thereby obtaining a large light distribution. ing. Specifically, the light within the capture angle α of the projection lens 12 is captured by the first reflection surface 18, reflected by the first reflection surface 18, and irradiated by the projection lens 12. The projection lens 12 is formed by the light that forms the light pattern A, captures the light with the capture angle β below the capture angle α below the HID lamp 16 and irradiates it without passing through the projection lens 12. A large amount of light distribution is obtained by reflecting in front of the light.

  Therefore, according to the vehicle headlamp unit 10 of the present embodiment, the HID lamp 16 is disposed below the unit optical axis Ax of the projection lens 12, but the second reflecting surface 20 is added in terms of configuration. It becomes only the composition which did. Therefore, as compared with the conventional vehicle headlamp unit, a large amount of light distribution can be obtained by effectively using light that is not used in forming the light distribution pattern A for the passing beam without increasing the number of parts. Can do.

  By the way, when the HID lamp 16 is arranged on the unit optical axis Ax, the distance between the HID lamp 16 and the second reflecting surface 20 becomes long, and thus the second reflecting surface 20 has to be enlarged. This is because when the HID lamp 16 is disposed at the position of the unit optical axis Ax while maintaining the same lower side capture angle β as in FIG. 2, the distance between the HID lamp 16 and the second reflecting surface 20 becomes long. Therefore, the same lower take-in angle β cannot be obtained unless the second reflecting surface 20 is made large in size accordingly. That is, since the second reflecting surface 20 has a function of reflecting the light irradiated downward from the HID lamp 16 to the front of the projection lens 12 without passing through the projection lens 12, the unit optical axis Ax of the projection lens 12 is provided. The position of the second reflecting surface 20 with respect to is determined by design. Based on this, if the HID lamp 16 is disposed below the unit optical axis Ax as in the vehicle headlamp unit 10 of the embodiment, the position of the second reflecting surface 20 and the HID are determined. Since the distance to the lamp 16 is shortened, the second reflecting surface 20 can be miniaturized as shown in FIG. If the second reflecting surface 20 is reduced in size, the entire vehicle headlamp unit 10 is reduced in size, leading to a reduction in weight.

  Further, the lower end edge 18B of the first reflecting surface 18 of the vehicle headlamp unit 10 coincides with the lower end of the capture angle range α of the projection lens 12 and is along a horizontal plane substantially parallel to the unit optical axis Ax. Has been placed.

  In the vehicle headlamp unit of the conventional normal configuration, in the path where the light on the lower side of the HID lamp enters the projection lens, a part of the light reflected by the first reflecting surface is shielded by the HID lamp. The HID lamp itself is a shading object. When the HID lamp is lowered, the above-mentioned light shielding becomes remarkable. Therefore, it is useless to have a reflecting surface that is incident on the projection lens from the lower side of the HID lamp within the capturing angle range of the projection lens, and the reflecting surface is unnecessary. It is.

  Therefore, as in the vehicle headlamp unit 10 of FIG. 2, the lower end edge 18B of the first reflecting surface 18 is made to coincide with the lower end of the capture angle range α of the projection lens 12 and substantially parallel to the unit optical axis Ax. Arranged along a horizontal plane. As a result, there is no reflective surface incident on the projection lens 12 from the lower side of the HID lamp 16, and the direct light irradiated downward from the HID lamp 16 is directed to the second reflective surface 20. The luminous flux of the HID lamp 16 facing can be used effectively.

  Further, as shown in FIG. 2, in the case of the vehicle headlamp unit 10 in which the HID lamp 16 is inserted from the bulb insertion hole 18A formed in the first reflecting surface 18, the lower end edge 18B of the bulb insertion hole 18A and It is preferable to arrange the HID lamp 16 at a position below the capturing angle range α of the projection lens 12 by matching the lower end of the capturing angle range α of the projection lens 12. As a result, the number of reflection surfaces incident on the projection lens 12 from the lower side of the HID lamp 16 is reduced, and most of the direct light irradiated downward from the HID lamp 16 is directed to the second reflection surface 20. The luminous flux of the HID lamp 16 directed downward can be effectively used.

  Further, the second reflecting surface 20 has the focal point F3 in the vicinity of the HID lamp 16 as described above, and the optical axis of the second reflecting surface 20 is in the direction of 30 degrees to 45 degrees outside the unit optical axis Ax of the projection lens 12. The cross section is formed in such a shape as shown in FIG. 5 (which corresponds to the left direction in the drawing since the left vehicle headlamp is shown).

  FIG. 6 is a schematic cross-sectional view of the second reflecting surface 20. The second reflecting surface 20 includes two reflecting surfaces 20a and 20b which are parabolic reflecting surfaces in the cross section, and has respective focal points F4a and F4b in the range of the direction of 30 degrees to 45 degrees outside. The second reflecting surface 20 has a parabolic shape in the longitudinal direction in the reflected light direction, reflects light emitted downward from the HID lamp 16, and extends up to 90 degrees outward from the unit optical axis Ax direction. Diffuse light distribution from side to side. Thereby, the light distribution pattern B shown in FIG. 5 can be obtained.

  According to FIG. 5, the light distribution pattern B that partially overlaps the light distribution pattern A for the low beam can be formed on the left side of the light distribution pattern A for the low beam so as to extend in the horizontal direction. Can be irradiated in a wide range, and pedestrians and obstacles can be detected at an early stage when turning to the left and on a curved road. Further, by setting the light distribution pattern B so as to irradiate an area in the vicinity of the automobile, the driver's surroundings can be brightened, so that the driver can feel bright and easy to drive.

  At this time, by providing a region where the light distribution pattern A and the light distribution pattern B overlap, the overlapping region can be brightened. In particular, the area near the car (overlapping area) is brightened to facilitate driving. Therefore, it is efficient to effectively use the light directly incident on the second reflecting surface 20 below from the HID lamp 16 as an optical path for irradiating the overlapping area with the light distribution pattern B. However, the yellow light that passes through the yellow region of the metal halide component that has accumulated under the HID lamp 16, that is, the lower part of the tube of the HID lamp 16, and is reflected by the second reflecting surface 20 under the HID lamp 16 is projected into the projection lens. Irradiation is aimed at the diagonally forward (in the case of traffic on the left side of the road, the pedestrian road on the left side of the lane). Therefore, although this part (40L-30L) can be brightened and the visibility of a pedestrian etc. can be improved, yellowishness appears conspicuously in this part simultaneously.

  Accordingly, the vehicle headlamp unit 10 according to the embodiment is an elliptical reflecting surface as shown in FIG. 2 in order to suppress the occurrence of yellow in the region C due to the provision of the second reflecting surface 20. A third reflecting surface 30 and a fourth reflecting surface 32 which is a parabolic reflecting surface are added. As another method, it is conceivable to diffuse and use light directed downward from the yellowish HID lamp 16, but if it is diffused to such an extent that it does not become yellowish, the brightness is insufficient. It is difficult to brighten a nearby area (for example, the region C) to facilitate driving. In particular, since the light emitted from the HID lamp 16 can be directly used, the efficiency can be further increased. Therefore, the light directed from the HID lamp 16 toward the second reflecting surface 20 is distributed with the light distribution pattern A described above. It is preferable to irradiate toward a region where the pattern B overlaps.

  That is, the white light emitted upward from the HID lamp 16 is reflected downward by the third reflecting surface 30, the white light reflected by the third reflecting surface 30 is reflected by the fourth reflecting surface 32, and the second reflection is performed. In the light distribution pattern B of FIG. 5 formed by being reflected by the surface 20, white light in a region D of approximately 0 ° to 45 ° from the vertical axis is superimposed in the horizontal region C in the horizontal direction. Thereby, the yellow color of the region C becomes white. Specifically, yellow is made white by superimposing white light having the same luminous intensity as yellow light (white light 4000 cd with respect to yellow light 4000 cd). Therefore, according to the vehicle headlamp unit 10, it is possible to suppress the occurrence of yellow in the light distribution pattern when the HID lamp 16 is used as the light source.

  The third reflecting surface 30 and the fourth reflecting surface 32 will be described. The third reflecting surface 30 is disposed in front of the HID lamp 16 and above the first reflecting surface 18 as shown in FIG. The third reflecting surface 30 has a focal point F5 in the vicinity of the HID lamp 16, and has a focal point F6 in front of the focal point F of the projection lens 12 and below the unit optical axis Ax. Accordingly, the white light irradiated obliquely upward and forward from the HID lamp 16 is reflected downward by the third reflecting surface 30. Further, the third reflecting surface 32 extends toward the projection lens 12 as shown in FIG. 2 in order to obtain the same luminous intensity as the yellow light described above, and secures the area of the reflecting surface.

  On the other hand, the fourth reflecting surface 32 is below the third reflecting surface 30, on the side of the second reflecting surface 20 as shown in FIG. 3, and slightly to the second reflecting surface 20 as shown in FIG. 4. It is arranged at a position protruding forward. The fourth reflecting surface 32 is formed as a paraboloid having the focal point F6 of the third reflecting surface 30 as the focal point F7. Further, the fourth reflecting surface 32 has an area for effectively reflecting the white light reflected by the third reflecting surface 32 and having the same luminous intensity as the yellow light.

  With such an arrangement, white light reflected by the third reflecting surface 30 and having the same luminous intensity as yellow light is effectively reflected by the fourth reflecting surface 32 in front of the projection lens 12 without passing through the projection lens 12. The white light in region D is superimposed on the yellow light in region C in FIG.

  In the embodiment, the region in which yellow is generated is the region C that is approximately 25 ° to 45 ° from the vertical axis in the horizontal direction, but is not limited thereto. When yellow light is generated in another region due to the design of the second reflecting surface 20, the third reflecting surface 30 and the fourth reflecting surface 32 are designed so as to include that region, and the fourth reflecting surface 30 to the fourth reflecting surface are designed. What is necessary is just to superimpose the white light reflected by the reflective surface 32 on the yellow light of the area | region.

  In the present embodiment, the vehicle headlamp unit includes the first reflecting surface 18, the second reflecting surface 20, the third reflecting surface 30, and the fourth reflecting surface 32, and makes the light distribution pattern yellow white. 10 is explained, but if the vehicle headlamp unit is intended only for making the yellow color of the light distribution pattern white, as a superordinate concept, projection optics that generates yellow in a predetermined region of the light distribution pattern Any vehicle headlamp unit including a system and a correction optical system that changes the yellow color to white may be used. That is, in the embodiment, the first reflecting surface 18 and the second reflecting surface 20 constitute a projection optical system, and the third reflecting surface 30 and the fourth reflecting surface 32 constitute a correction optical system, The vehicle headlamp unit 10 having four reflecting surfaces 18, 20, 30, and 32 will be described. However, if the projection optical system generates yellow in a predetermined region of the light distribution pattern, the number of reflecting surfaces is not limited to two, and if it is a correction optical system in which yellow is white The number of the reflective surfaces is not limited to two.

  FIG. 7 is a longitudinal sectional view taken along the line AA passing through the unit optical axis Ax of the vehicle headlamp unit 10 shown in FIG. 3, and the arrangement configuration of the third reflecting surface 30 and the fourth reflecting surface 32 mainly. FIG.

  According to the figure, the base end portion of the third reflecting surface 30 extends behind the unit optical axis Ax, and is fixed to a socket holding base 19 formed on the first reflecting surface 18. On the other hand, the base end portion of the fourth reflecting surface 32 is integrated with a bracket 34 that does not constitute a reflecting surface, and the bracket 34 is fixed to the socket holding base 19.

  FIG. 8 is a longitudinal sectional view taken along line B-B of the vehicle headlamp unit 10 shown in FIG. 3, and is a diagram mainly showing the arrangement configuration of the second reflecting surface 20.

  According to the figure, the base end portion of the second reflecting surface 20 extends behind the unit optical axis Ax and is fixed to the socket holding base 19. Further, a fifth reflecting surface 36 that forms a well-known light distribution pattern for overhead light is formed below the second reflecting surface 20.

  According to the vehicle headlamp unit 10 configured as described above, as shown in FIG. 2, the white-based light Ray 1 radiated diagonally forward and upward from the HID lamp 16 is reflected by the third reflecting surface 30 and the fourth reflecting surface 32. Light distribution is controlled so as to form a white region D (for example, 4000 cd) that overlaps with a colored (yellow) region C (for example, 4000 cd) in the combined light distribution pattern by the action of (corresponding to the correction optical system of the present invention). (See FIG. 5). Since the influence of the colored (yellow) region C is mitigated by the action of the white region D, it is possible to form a synthetic light distribution pattern (see FIG. 5) that conforms to the white chromaticity range defined by regulations. .

  In the vehicle headlamp unit 10 having the above configuration, as shown in FIGS. 14 and 15, light including yellow light radiated downward from the HID lamp 16 is transmitted in the irradiation direction of the second reflecting surface 20. In addition, it is preferable to dispose the colored lens 40.

[Technical significance of colored lens 40]
The inventors of the present application use four types of HID lamps (OSRAM reference sphere, Philips reference sphere, OSRAM mass production ball, and Philips mass production ball) shown in FIG. It was evaluated whether or not the light distribution pattern complies with the white chromaticity range (SAE, white chromaticity range defined by the ECE standards, see FIG. 18) defined by law.

  As a result, due to the types of HID lamps and product variations, the influence of the colored (yellow) region C is not sufficiently mitigated, and in some HID lamps, the light distribution conforms to the white chromaticity range defined by laws and regulations. It was found that a pattern could not be formed (see FIGS. 9 and 10). The “x” in the “None” column in FIG. 9 and the plot outside the white chromaticity range in FIG. 10 indicate this.

  The inventors of the present application have made extensive studies so as to be able to form a light distribution pattern that conforms to the white chromaticity range stipulated by laws and regulations, even if various (or product variations) HID lamps 16 are used. It was. As a result, if a colored lens that inhibits the transmission of yellow light, which causes coloring, is arranged in the irradiation direction of the second reflecting surface 20, almost no color (yellow) appears in the light distribution pattern, and is determined by laws and regulations. The idea was that a light distribution pattern suitable for the white chromaticity range could be formed.

  As a result of further investigation based on the above idea, first, when a blue colored lens (thickness: about 2 mm) that is complementary to yellow is used as the colored lens, the colored lens is transmitted. Due to the fact that the blue component is stronger (or insufficient) than the other color components, the yellow component of the irradiated light cannot be absorbed sufficiently, and a light distribution pattern that conforms to the white chromaticity range specified by law is formed. What cannot be done (see FIGS. 11 (a) and 11 (b)), and secondly, as a colored lens, red (for example, 0.46267 ≦ x ≦ 0.46698, 0.40096 in xy chromaticity coordinates). ≦ y ≦ 0.40257 red color within the chromaticity range (see FIG. 12) When a colored lens is used, yellow light transmitted through the colored lens is significantly reduced (see FIG. 13). Blue enough to erase Because it transmits through the colored lens (that is, the blue component on the spectrum has a good balance), it is possible to form a light distribution pattern suitable for the white chromaticity range stipulated by laws and regulations. (See FIG. 16). FIG. 13 shows the result of measuring the transmission color of a red colored lens included in the chromaticity range (using a spectrocolorimeter (KONICA MINOLTA CM-3700d)), where the vertical axis represents the transmittance and the horizontal axis represents the transmittance. It is the graph plotted on the coordinate system of a wavelength. Referring to FIG. 13, it can be seen that the yellow light (wavelength 580 to 595 nm) transmitted through the red colored lens included in the chromaticity range is significantly reduced. Note that “A light source” in FIG. 11 is a light source serving as a reference for accurately judging and measuring the color. In this embodiment, a gas-filled tungsten light bulb having a color temperature of 2854 K is used as the A light source. It was.

  In the present embodiment, based on the above knowledge, as shown in FIG. 14 and FIG. 15, the chromaticity ranges of 0.46267 ≦ x ≦ 0.46698 and 0.40096 ≦ y ≦ 0.40257 in the xy chromaticity coordinates are set. The included red colored lens 40 is used as an inner lens and arranged in the irradiation direction of the second reflecting surface 20. The colored lens 40 can be arranged not only as an inner lens but also as an outer lens or in other forms.

  According to the vehicle headlamp unit 10 using the colored lens 40 having the above-described configuration, the inventors of the present application can use the colored lens 40 even if various (or product variation) HID lamps 16 are used. Due to the action, the transmittance of yellow light (wavelength 580 to 595 nm) that causes coloring is remarkably reduced (see FIG. 13), so that the colored (yellow) region C hardly appears, and the white chromaticity determined by the regulations. It was confirmed that a synthetic light distribution pattern suitable for the range could be formed (see FIG. 16). The plot within the white chromaticity range in FIG. 16 represents this.

[Technical significance in combination with the correction optical system (the third reflecting surface 30 and the fourth reflecting surface 32) rather than simply arranging the colored lens 40]
According to the vehicle headlamp unit 10 in which the colored lens 40 is arranged as described above, the correction optical system (the third reflection surface 30 and the fourth reflection surface 32) is provided, and the correction optical system (the third reflection surface). 30 and the fourth reflecting surface 32), since the influence of the colored (yellow) region C is moderated to some extent, the coloring of the colored lens 40 can be reduced and the transmittance can be improved (improvement of light utilization efficiency). .

  That is, according to the vehicle headlamp unit 10 in which the colored lens 40 is disposed, the colored lens 40 is not simply disposed, but is combined with the correction optical system (the third reflecting surface 30 and the fourth reflecting surface 32). In addition, it is possible to realize a vehicular lamp that has a very high light utilization efficiency and can form a combined light distribution pattern that conforms to the white chromaticity range defined by laws and regulations. FIG. 17 is a table showing the results of measuring the transmittance of the colored lens 40 (using a measuring machine (HGM-2DP) manufactured by Suga Test Instruments Co., Ltd.). Referring to FIG. 17, it can be seen that when the red colored lens 40 included in the white chromaticity range is used, the transmittance is about 80%, and there is no practical problem.

  As described above, according to the vehicle headlamp unit 10 in which the colored lens 40 is arranged, the transmittance of the yellow light that causes the coloring is remarkable due to the action of the colored lens 40 that is colored with a red color. In order to reduce (see FIG. 13), even if light including yellow light radiated downward from the HID lamp 16 is used, almost no color (yellow) appears in the combined light distribution pattern, and the white color defined by regulations It is possible to form a synthetic light distribution pattern (see FIG. 5) that fits the degree range.

  Moreover, since the colored lens 40 is a red colored lens rather than a blue-based lens, it looks red when it is not lit, and North American laws and regulations (for example, the North American California law stipulates that blue cannot be used for headlamps). It is possible to configure the vehicle headlamp unit 10 that can cope with the above.

  Further, according to the vehicle headlamp unit 10 in which the colored lens 40 is disposed, due to the type of the HID lamp 16 and product variations, only the correction optical system (the third reflecting surface 30 and the fourth reflecting surface 32) Even if the influence of the colored (yellow) region C on the combined light distribution pattern is not sufficiently mitigated and a combined light distribution pattern that conforms to the white chromaticity range defined by laws and regulations cannot be formed (see FIGS. 9 and 10), Due to the action of the colored lens 40, the transmittance of yellow light that causes coloring is remarkably reduced (see FIG. 13), so that the colored (yellow) region C hardly appears, and the white chromaticity range defined by the regulations is reached. A suitable synthetic light distribution pattern can be formed (see FIG. 16).

  Moreover, according to the vehicle headlamp unit 10 in which the colored lens 40 is arranged, the correction optical system (the third reflection surface 30 and the fourth reflection surface 32) is provided, and the correction optical system (the third reflection surface 30, Since the influence of the colored (yellow) region C is relaxed to some extent by the fourth reflecting surface 32), it is possible to reduce the coloring of the colored lens 40 and improve the transmittance (improvement of light utilization efficiency).

  That is, according to the vehicle headlamp unit 10 in which the colored lens 40 is disposed, the colored lens 40 is not simply disposed, but is combined with the correction optical system (the third reflecting surface 30 and the fourth reflecting surface 32). In addition, it is possible to realize a vehicular lamp that has a very high light utilization efficiency and can form a combined light distribution pattern that conforms to the white chromaticity range defined by laws and regulations.

  Next, a modified example will be described.

  In the above embodiment, the colored lens 40 configured to absorb yellow light from the light from the HID lamp 16 and fall within a white chromaticity range determined by law is red ( For example, a red color included in the chromaticity range of 0.46267 ≦ x ≦ 0.46698 and 0.40096 ≦ y ≦ 0.40257 in the xy chromaticity coordinates. However, the present invention is not limited to this. For example, as long as it absorbs yellow light out of the light from the HID lamp 16 and the predetermined light distribution pattern falls within the white chromaticity range defined by the law, it may be a colored lens other than red.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle headlamp unit, 12 ... Projection lens, 14 ... Light-shielding plate, 16 ... HID lamp, 18 ... First reflective surface, 19 ... Socket holding base, 20 ... Second reflective surface, 22 ... Lens holder, 24 ... Plate, 30 ... Third reflective surface, 32 ... Fourth reflective surface, 34 ... Bracket, 36 ... Fifth reflective surface, 40 ... Colored lens

Claims (2)

In a vehicle lamp that emits light for forming a predetermined light distribution pattern using light emitted from an HID lamp,
An upper optical system that is disposed above the HID lamp and irradiates light for forming a first light distribution pattern using light mainly emitted from the white light emitted upward from the light emitted from the HID lamp; ,
A lower optical system that is disposed below the HID lamp and that emits light for forming a second light distribution pattern using light including yellow light emitted downward from the light emitted from the HID lamp. When,
Correction optics for irradiating light for forming a white region superimposed on a yellow colored region in the second light distribution pattern using white-based light emitted diagonally forward and upward from the HID lamp The system,
A colored lens disposed in the irradiation direction of the lower optical system,
The colored lenses, the absorbing yellow light among the light from HID lamps, Ri configured colored lenses der so that the predetermined light distribution pattern is within the range of the following expression in the xy chromaticity diagram,
The white area is in the range of about 0 ° to 45 ° from the vertical axis in the horizontal direction;
The yellow colored region in the second light distribution pattern is narrower than the white region and is in the range of about 25 ° to 45 ° from the vertical axis in the horizontal direction, and the white region is the yellow colored region. The light distribution is controlled to illuminate a range of
Light white entity from the correcting optical system with light including the yellow light from the lower optical system, a vehicle lamp, wherein the equivalent luminosity der Rukoto. y = 0.150 + 0.640x, y = 0.440, x = 0.500, y = 0.382, y = 0.050 + 0.750x, x = 0.310. The colored lens is a red colored lens included in a chromaticity range of 0.46267 ≦ x ≦ 0.46698 and 0.40096 ≦ y ≦ 0.40257 in an xy chromaticity diagram. Item 2. A vehicle lamp according to Item 1 .

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