JP2017016784A - Vehicle headlamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform light distribution design and light distribution control for a high bean distribution pattern and a low beam distribution pattern.SOLUTION: A vehicular head lamp includes a lens 3, a first optical unit 1, a right side second optical unit 2R, a left side optical unit 2L, and a shade 4. With this structure, the vehicular head lamp can easily perform light distribution design and light distribution control for a high beam distribution pattern (first light distribution pattern P1) by the first optical unit 1. With the right side second optical unit 2R, the left side second optical unit 2L and the shade 4, the vehicular head lamp can easily perform light distribution design and light distribution control for a low beam distribution pattern (right side second light distribution pattern P2R, left side second light distribution pattern P2L).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front that can switch a light distribution pattern irradiated to the front of a vehicle between a low beam light distribution pattern (low beam light distribution pattern) and a traveling beam light distribution pattern (high beam light distribution pattern). It relates to lighting.

  This type of vehicle headlamp has been conventionally used (for example, Patent Document 1 and Patent Document 2). Hereinafter, the vehicle headlamp of Patent Document 1 and the vehicle headlamp of Patent Document 2 will be described.

  The vehicle headlamp disclosed in Patent Literature 1 includes a projection lens, a projector-type first optical unit, and a projector-type second optical unit. The projection lens includes a central first lens portion having a first optical axis, and left and right second lens portions respectively disposed on the left and right sides of the first lens portion and having a second optical axis. The first optical unit includes a first semiconductor light emitting element, a spheroidal first reflecting surface, and a first shade, and is disposed on the rear side of the central first lens unit. The second optical unit includes a second semiconductor light emitting element and a spheroid second reflecting surface, and is disposed on the rear side of the left and right second lens portions, respectively.

  In the vehicle headlamp of Patent Document 1, when the central first semiconductor light emitting element is turned on, the light from the central first semiconductor light emitting element is reflected by the central first reflecting surface, and the reflected light is centered. Part of the first shade is cut off, and the remaining reflected light is transmitted through the central first lens portion and irradiated to the front of the vehicle as a low beam light distribution pattern having a cut-off line at the upper end edge. This low beam light distribution pattern is a high-light-concentration (spot-like) high-illuminance pattern. Further, in the vehicle headlamp disclosed in Patent Document 1, when the left and right second semiconductor light emitting elements are turned on simultaneously with the lighting of the central first semiconductor light emitting element, the light from the left and right second semiconductor light emitting elements is transmitted to the left and right second semiconductor light emitting elements. Reflected by the two reflecting surfaces, the reflected light passes through the left and right second lens portions, and is irradiated to the front of the vehicle as a high beam light distribution pattern. This high beam light distribution pattern is a high-light-concentration (spot-like) high-illuminance pattern. Then, a high beam composite pattern in which the low beam light distribution pattern and the high beam light distribution pattern are superimposed is formed.

  A vehicle headlamp disclosed in Patent Document 2 includes a projection lens, a first light source, a projector optical system reflector having an elliptical cross section, a second light source, and a parabolic optical system extending below the projector optical system reflector. And a reflector.

  In the vehicle headlamp of Patent Document 2, when the first light source is turned on, the light from the first light source is reflected by the upper projector optical system reflector, and the reflected light passes through the projection lens and is distributed for low beam. The light pattern is irradiated in front of the vehicle. When the second light source is turned on, the light from the second light source is reflected by the lower parabolic optical system reflector, and the reflected light passes under the projection lens and is irradiated to the front of the vehicle as a high beam light distribution pattern. The The high beam light distribution pattern of the parabolic optical system is a light distribution pattern diffused more than the low beam light distribution pattern of the projector optical system, and complements the periphery of the low beam light distribution pattern.

JP2013-152855A JP 2009-301980 A

  However, the vehicle headlamp disclosed in Patent Document 1 includes a first lens unit, a projector-type first optical unit (including a first semiconductor light emitting element, a first reflecting surface, a first shade, and a first lens unit). Is suitable for forming a low-beam light distribution pattern with a high light-collecting (spot-like) high-illuminance pattern, but with a diffusion-type low-beam light distribution pattern. There are challenges in light distribution design and light distribution control.

  The vehicular headlamp disclosed in Patent Document 2 has a parabolic optical system reflector extending below the projector optical system reflector, and therefore has a light distribution pattern that is diffused more than the low beam light distribution pattern of the projector optical system. It is suitable for forming a high-beam light distribution pattern for a parabolic optical system that complements the surroundings of a low-beam light distribution pattern, but for light distribution design and light distribution control of a condensing type high-beam light distribution pattern. There are challenges.

  The problem to be solved by the present invention is to easily achieve both light distribution design and light distribution control of a condensing type high beam light distribution pattern and light distribution design and light distribution control of a diffusion type low beam light distribution pattern. An object of the present invention is to provide a vehicular headlamp that can be used.

  The present invention (the invention according to claim 1) includes a lens, a first optical unit, a second optical unit, and a shade, and a first light distribution pattern of a condensing type by the lens and the first optical unit. Is a vehicle headlamp that irradiates the front of the vehicle with a diffusion type second light distribution pattern having a cut-off line at the upper edge by the lens, the second optical unit, and the shade. Has a first lens portion and a second lens portion, the first lens portion is disposed above the second lens portion, and the second lens portion has a focal point and an optical axis. The first lens unit is a lens whose thickness is thinner than the thickness of the second lens unit, the first optical unit has a first light source and a first reflecting surface, A parabola whose first reflecting surface is focused on the first light source or its vicinity. And is arranged so as to intersect with the optical axis of the second lens unit in plan view, and reflects light from the first light source to the incident surface of the first lens unit. The reflecting surface is an incident surface, and the second optical unit includes a second light source and a second reflecting surface, and is disposed on both sides of the first optical unit in plan view, and the second reflecting surface is A reflection surface based on an ellipsoid having the second light source or the vicinity thereof as the first focal point and the focal point of the second lens unit or the vicinity thereof as the second focal point, and reflects light from the second light source And the shade is disposed between the second lens unit and the second optical unit, and the upper edge of the shade forming the cut-off line is the first reflecting surface that is incident on the incident surface of the second lens unit. 2 Located at or near the focal point of the lens , Characterized in that.

  The present invention (the invention according to claim 2) is characterized in that the first lens portion is located above the optical axis of the second lens portion.

  This invention (the invention according to claim 3) is characterized in that the area of the first lens portion is narrower than the area of the second lens portion.

  In the present invention (the invention according to claim 4), the exit surface of the lens has a convex aspheric surface, the lens has a circular shape or a substantially circular shape in front view, and the first lens portion has an arc and a lower side in the front view. The lower string or arc of the first lens unit is inclined with an upward gradient from the inner side to the outer side of the vehicle.

  This invention (the invention according to claim 5) is characterized in that an optical element group is provided on at least one of the incident surface and the exit surface of the first lens portion.

  The present invention (the invention according to claim 6) is characterized in that the first optical unit is arranged on the rear side with respect to the second optical unit.

  The present invention (the invention according to claim 7) is characterized in that the second optical unit is disposed on the rear side with respect to the first optical unit.

  In the vehicle headlamp according to the present invention, the first lens portion is disposed on the upper side with respect to the second lens portion, and a lens whose thickness is thinner than the thickness of the second lens portion of the projection lens is provided as the first lens portion. Used, the first optical unit is arranged at the center, and the first reflecting surface based on the parabolic surface focusing on the first light source or its vicinity is arranged so as to intersect the optical axis of the second lens unit. Is. For this reason, the vehicle headlamp according to the present invention includes a first light distribution pattern of a condensing type by the first lens unit and the first optical unit, as compared with the vehicle headlamp disclosed in Patent Document 2. For example, it is possible to easily perform light distribution design and light distribution control of a high beam light distribution pattern (see FIG. 4) that illuminates the front (center) range in front of the vehicle.

  In the vehicle headlamp according to the present invention, the second lens unit is disposed below the first lens unit, a projection lens is used as the second lens unit, and the second optical unit is disposed on both sides of the first optical unit. The second reflecting surface based on an ellipsoid having the second light source or the vicinity thereof as the first focal point and the focal point of the second lens unit or the vicinity thereof as the second focal point is provided on both sides of the first reflecting surface. And a shade is disposed between the second lens unit and the second optical unit. For this reason, the vehicular headlamp according to the present invention has a second light distribution pattern of a diffusion type due to the second lens portion, the second optical unit, and the shade, as compared with the vehicular headlamp disclosed in Patent Document 1. For example, light distribution design and light distribution control of a low beam light distribution pattern (see FIG. 9) that illuminates a wide range from the center to the left and right of the lower front side (front side) of the vehicle can be easily performed.

  As described above, the vehicle headlamp according to the present invention has the light distribution design and light distribution control of the condensing type high beam light distribution pattern and the light distribution design and light distribution control of the diffusion type low beam light distribution pattern. It is possible to easily achieve both.

1 is a schematic cross-sectional view (schematic horizontal cross-sectional view) showing a first embodiment of a vehicle headlamp according to the present invention, and is a schematic cross-sectional view taken along the line II in FIG. 2 (A). FIG. 2 is a front view showing the lens, and is a view taken along arrow II in FIG. 3 is a schematic longitudinal sectional view (schematic vertical sectional view) showing the lens and the first optical unit, and is a schematic sectional view taken along line III-III in FIG. FIG. 4 is an explanatory diagram showing a condensing-type first light distribution pattern (high beam light distribution pattern) that is irradiated to the front of the vehicle by the first lens unit and the first optical unit shown in FIG. 3. FIG. 5 is a schematic longitudinal sectional view (schematic vertical sectional view) showing a lens, a second optical unit on the right side, and a shade, and is a schematic sectional view taken along line VV in FIG. FIG. 6 is an explanatory view showing a diffusion-type left second light distribution pattern (left low beam light distribution pattern) that is irradiated in front of the vehicle by the second lens unit, the right second optical unit, and the shade shown in FIG. It is. 7 is a schematic longitudinal sectional view (schematic vertical sectional view) showing a lens, a second optical unit on the left side, and a shade, and is a schematic sectional view taken along line VII-VII in FIG. FIG. 8 is an explanatory diagram showing a diffusion-type right second light distribution pattern (right low beam light distribution pattern) irradiated in front of the vehicle by the second lens unit, the left second optical unit, and the shade shown in FIG. It is. FIG. 9 is an explanatory diagram showing a passing beam distribution pattern (low beam distribution pattern) obtained by combining (superimposing) the second left light distribution pattern shown in FIG. 6 and the second right light distribution pattern shown in FIG. FIG. 10 is an illustration showing a traveling beam light distribution pattern (high beam light distribution pattern) obtained by combining (superimposing) the first light distribution pattern shown in FIG. 4 and the passing beam light distribution pattern (low beam light distribution pattern) shown in FIG. FIG. FIG. 11: is a front view of the lens which shows Embodiment 2 of the vehicle headlamp concerning this invention. 12 is a longitudinal sectional view (vertical sectional view) of the lens, and is a sectional view taken along line XII-XII in FIG.

  Hereinafter, two examples of embodiments (examples) of a vehicle headlamp according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In this specification and the appended claims, front, rear, top, bottom, left, right are front, back, top, bottom, when the vehicle headlamp according to the present invention is mounted on a vehicle. Left and right. 1-3, FIG. 5, FIG. 7, FIG. 11, FIG. 12, “F” is “front”, “B” is “rear”, “U” is “up”, and “D” is “lower”. ”And“ L ”are“ left ”and“ R ”is“ right ”.

  4, 6, and 8 to 10, the symbol “VU-VD” indicates vertical lines on the screen. The symbol “HL-HR” indicates a horizontal line on the left and right on the screen. 4, FIG. 6, FIG. 8, and FIG. 9 are explanatory diagrams of isoluminous intensity curves (isoluminance curves) that show simplified light distribution patterns on the screen. In the explanatory diagram of the isoluminous curve (isoluminous curve), the central isoluminous curve (isoluminous curve) indicates high luminous intensity (high illuminance), and the outer isoluminous curve (isoluminous curve) indicates low luminous intensity (isoluminous curve). Low illumination). In FIGS. 1, 3, 5, 7, and 12, cross-sectional hatching of the lens is omitted.

(Description of Configuration of Embodiment 1)
1 to 10 show Embodiment 1 of a vehicle headlamp according to the present invention. Hereinafter, the configuration of the vehicle headlamp 100 according to the first embodiment will be described. In this example, for example, a headlamp of an automotive headlamp will be described.

(Description of the vehicle headlamp 100)
The vehicle headlamp 100 is mounted on each of the left and right sides of the front portion of a vehicle (not shown). Hereinafter, the vehicle headlamp 100 mounted on the left side of the vehicle will be described. In the vehicle headlamp 100 mounted on the left side of the vehicle, the left side is the outside of the vehicle and the right side is the inside of the vehicle. In the vehicle headlamp 100 mounted on the right side of the vehicle, the right side is the outside of the vehicle and the left side is the inside of the vehicle.

  As shown in the figure, the vehicle headlamp 100 includes a lamp housing (not shown), a lamp lens (not shown), a lens 3, a first optical unit 1, and a right second optical unit 2R. And a left second optical unit 2L, a shade 4, a heat sink member 5, a reflector 6, and a holder (not shown). The vehicle headlamp 100 is a single-lens (one lens 3) type vehicle headlamp.

  The lamp housing and the lamp lens (for example, a transparent outer lens) define a lamp chamber (not shown). The lens 3, the first optical unit 1, the right second optical unit 2R, the left second optical unit 2L, the shade 4, the heat sink member 5, the reflector 6 and the holder are disposed in the lamp chamber. And is attached to the lamp housing via a mounting bracket (not shown), a vertical optical axis adjusting mechanism (not shown), and a horizontal optical axis adjusting mechanism (not shown).

  As shown in FIGS. 1, 3, and 4, the vehicular headlamp 100 uses the lens 3 and the first optical unit 1 to bring a condensing type first light distribution pattern P <b> 1 to the front of the vehicle. Irradiate. In this example, the first light distribution pattern P1 is a high beam light distribution pattern that illuminates a front (center) range in front of the vehicle.

  As shown in FIGS. 1, 5, and 6, the vehicle headlamp 100 is a diffusion type having a cut-off line CL at the upper edge by the lens 3, the right second optical unit 2 </ b> R, and the shade 4. The left second light distribution pattern P2L is irradiated in front of the vehicle. In this example, the left second light distribution pattern P2L is a left low beam light distribution pattern that illuminates a wide range from the center to the left side of the front side (front side) of the vehicle.

  As shown in FIGS. 1, 7, and 8, the vehicular headlamp 100 is a diffusion type having a cut-off line CL at the upper edge by the lens 3, the left second optical unit 2 </ b> L, and the shade 4. The right second light distribution pattern P2R is irradiated in front of the vehicle. In this example, the right second light distribution pattern P2R is a right low beam light distribution pattern that illuminates a wide range from the center to the right side on the lower front side (front side) of the vehicle.

  The left second light distribution pattern P2L shown in FIG. 6 and the second right light distribution pattern P2R shown in FIG. 8 are combined (superimposed). Then, a passing beam light distribution pattern PL shown in FIG. 9 is formed. The passing beam light distribution pattern PL is a diffusion type second light distribution pattern having a cut-off line CL at the upper edge. In this example, the low beam light distribution pattern PL is a low beam light distribution pattern that illuminates a wide range from the center to the left and right of the lower front side (front side) of the vehicle.

  In this example, the cut-off line CL includes a horizontal cut-off line and an oblique cut-off line. In addition to the cut-off line CL, the cut-off line includes a cut-off line including a lower horizontal cut-off line, an oblique cut-off line, and an upper horizontal cut-off line.

  The first light distribution pattern P1 shown in FIG. 4 is a central portion of the passing beam light distribution pattern PL shown in FIG. 9, and is slightly above the cut-off line CL of the passing beam light distribution pattern PL. It is synthesized (superimposed) on the part from to. Then, a traveling beam light distribution pattern PH is formed as shown in FIG. The traveling beam light distribution pattern PH is a high beam light distribution pattern that illuminates a limited range of the front (center) of the front of the vehicle and a wide range from the center to the left and right of the lower front (front) of the vehicle. .

(Description of lens 3)
The lens 3 is attached to the heat sink member 5 via the holder. As shown in FIGS. 1 to 3, 5, and 7, the lens 3 includes a first lens unit 31, a second lens unit 32, and a periphery of the first lens unit 31 and the second lens unit 32. And an annular flange portion 33.

  The first lens unit 31 is disposed on the upper side with respect to the second lens unit 32. The second lens unit 32 is a projection lens having a focal point (hereinafter referred to as “lens focal point”) F3, an optical axis (hereinafter referred to as “lens optical axis”) Z, an incident surface 320, and an output surface 321. . The first lens unit 31 is a lens whose wall thickness (plate thickness) is thinner than the wall thickness of the second lens unit 32. The first lens portion 31 is provided in a portion where a part of the lens 3 is hollowed out. The first lens portion 31 is a substantially transparent lens having a substantially constant thickness (plate thickness). The first lens unit 31 is a lens that does not have a focal point and an optical axis, but has an entrance surface 310 and an exit surface 311.

  The exit surface of the lens 3, that is, the exit surface 311 of the first lens unit 31 and the exit surface 321 of the second lens unit 32 form a convex aspheric surface. The lens 3 is circular or almost circular when viewed from the front (see FIG. 2). The area of the first lens unit 31 (front view area) is narrower than the area of the second lens unit 32 (front view area).

  The first lens portion 31 has a shape composed of an upper arc and a lower chord in front view. The first lens unit 31 is located on the upper side with respect to the lens optical axis Z. That is, the lower chord of the first lens unit 31 is located above the horizontal line passing through the lens optical axis Z.

  A part of the lower string of the first lens portion 31 is inclined with an upward gradient from the inner side (right side) to the outer side (left side) of the vehicle, as indicated by a two-dot chain line in FIG. ing. As shown in FIG. 2B, all of the lower strings of the first lens portion 31 may be inclined with an upward gradient from the inner side (right side) to the outer side (left side) of the vehicle. . Further, the shape of the first lens portion 31 on the lower side when viewed from the front may be an arc other than the string.

  An optical element group (indicated by a vertical broken line in FIG. 2) is provided on at least one of the entrance surface 310 and the exit surface 311 (preferably the entrance surface 310) of the first lens unit 31. Is provided. Examples of the optical element group include a cross-section arc or a two-sided vertical prism (vertical cone-shaped prism, vertical triangular prism) group, a fish-eye prism group, or a textured surface subjected to graining. .

(Description of the first optical unit 1)
As shown in FIGS. 1 and 3, the first optical unit 1 has a first light source 10 and a first reflecting surface 11.

  In this example, the first light source 10 is a self-emitting semiconductor light source (semiconductor light source) such as an LED, an OEL, or an OLED (organic EL). The first light source 10 is mounted in the center of the substrate 7 and is attached to the heat sink member 5 via the substrate 7.

  The first light source 10 has a rectangular light emitting surface. The light emitting surface faces upward. The first light source 10 is arranged on the lens optical axis Z so that the longitudinal direction of the light emitting surface is orthogonal or almost orthogonal to the lens optical axis Z.

  The first reflecting surface 11 is provided at a central portion of the surface of the reflector 6 that faces the first light source 10. The first reflecting surface 11 is a reflecting surface based on a paraboloid having the focal point F1 in the first light source 10 or the vicinity thereof as a base (tone). The focal point F1 and the center of the light emitting surface coincide with each other or substantially coincide with each other.

  As shown in FIG. 1, the first reflecting surface 11 is disposed so as to intersect the lens optical axis Z in a plan view. That is, the first reflecting surface 11 covers (strides) the lens optical axis Z. The first reflecting surface 11 is a reflecting surface that reflects the light L <b> 1 from the first light source 10 and enters the incident surface 310 of the first lens unit 31.

(Description of the right second optical unit 2R and the left second optical unit 2L)
As shown in FIGS. 1, 5, and 7, the right second optical unit 2R and the left second optical unit 2L include a right second light source 20R, a left second light source 20L, a right second reflecting surface 21R, And a second left reflective surface 21L. The right second optical unit 2R and the left second optical unit 2L are respectively disposed on the left and right sides of the first optical unit 1 in plan view.

  In this example, the right second light source 20R and the left second light source 20L are self-luminous semiconductor light sources (semiconductor light sources) such as LEDs, OELs, or OLEDs (organic ELs). The right second light source 20 </ b> R and the left second light source 20 </ b> L are mounted on the left and right ends of the substrate 7, and are attached to the heat sink member 5 via the substrate 7.

  The right second light source 20R and the left second light source 20L have a rectangular light emitting surface. The light emitting surface faces upward. The right second light source 20R and the left second light source 20L are arranged on the left and right sides of the first light source 10 so that the longitudinal direction of the light emitting surface is orthogonal or substantially orthogonal to the lens optical axis Z. ing.

  The right second reflecting surface 21R and the left second reflecting surface 21L are on the left and right sides of the first reflecting surface 11 at the center of the reflector 6, and are the right second light source 20R and the left second light source 20L. Are provided on both the left and right side portions of the surface facing each other. The right second reflecting surface 21R and the left second reflecting surface 21L are the right second light source 20R, the left second light source 20L or the vicinity thereof as the right first focus F1R, the left first focus F1L, and the This is a reflecting surface based on an ellipsoid having the lens focal point F3 or its vicinity as the right second focal point F2R and the left second focal point F2L.

  The right first focus F1R, the left first focus F1L, the center of the light emitting surface of the right second light source 20R, and the center of the light emitting surface of the left second light source 20L coincide with or substantially coincide with each other. The right second focus F2R and the left second focus F2L coincide with or substantially coincide with each other.

  The right second reflecting surface 21R and the left second reflecting surface 21L reflect the light L2R and L2L from the right second light source 20R and the left second light source 20L to reflect the incident surface of the second lens unit 32. This is a reflection surface incident on 320.

  The right second optical unit 2R and the second lens portion 32 of the projection lens constitute a projector type lamp unit. The left second optical unit 2L and the second lens portion 32 of the projection lens similarly constitute a projector type lamp unit. Therefore, the image of the light emitting surface of the right second light source 20R and the image of the light emitting surface of the left second light source 20L include the lens focal point F3 and are perpendicular or nearly perpendicular to the lens optical axis Z. The image of the light emitting surface when it passes through a plane and the image of the light emitting surface when it is emitted from the second lens portion 32 and projected onto the screen are flipped horizontally and vertically.

(Description of shade 4)
The shade 4 is made of a light impermeable member. The shade 4 is attached to the heat sink member 5. The shade 4 is disposed between the second lens unit 32, the right second optical unit 2R, and the left second optical unit 2L. The upper edge of the shade 4 that forms the cut-off line CL is disposed at or near the lens focal point F3.

(Description of heat sink member 5)
The heat sink member 5 is made of a material having high thermal conductivity, for example. The heat sink member 5 includes a plate-shaped attachment portion 50 and a fin-shaped heat radiation portion 51. The lens 3 is attached to the attachment portion 50 via the holder, and the first light source 10, the right second light source 20R, and the left second light source 20L are attached via the substrate 7. Furthermore, the shade 4 and the reflector 6 are attached.

  The heat sink member 5 emits heat generated in the first light source 10, the right second light source 20R, and the left second light source 20L to the outside. The heat sink member 5 also serves as an attachment member for attaching the lens 3, the holder, the first light source 10, the right second light source 20 </ b> R, the left second light source 20 </ b> L, the substrate 7, the shade 4, and the reflector 6. To do.

(Description of reflector 6)
The reflector 6 is made of a light impermeable material. The reflector 6 is attached to the heat sink member 5. The reflector 6 has a hollow shape in which the front side portion and the lower side portion are open, and the rear side portion, the upper side portion, and the left and right side portions are closed. The first reflecting surface 11, the right second reflecting surface 21 </ b> R, and the left second reflecting surface 21 </ b> L are provided on the concave inner surface of the closed portion of the reflector 6.

(Description of the operation of the first embodiment)
The vehicle headlamp 100 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  The right second light source 20R of the right second optical unit 2R and the left second light source 20L of the left second optical unit 2L are turned on simultaneously.

  Then, as shown in FIGS. 1 and 5, the light L2R emitted from the right second light source 20R is directed to the right second focus F2R and the lens focus F3 on the right second reflecting surface 21R of the right second optical unit 2R. And reflected. A part of the reflected light L2R toward the second right focus F2R and the lens focus F3 is cut off by the shade 4. The reflected light L <b> 2 </ b> R that has not been cut off by the shade 4 is incident on the incident surface 320 of the second lens unit 32 and is emitted from the output surface 321 of the second lens unit 32. The emitted light L2R is, as shown in FIG. 6, a diffusion type left second light distribution pattern (left low beam light distribution pattern) P2L having a cut-off line CL at the upper edge, as shown in FIG. Illuminate a wide range from the center to the left.

  Here, the right-side second optical unit 2R and the second lens unit 32 of the projection lens constitute a projector-type lamp unit. For this reason, in the image of the light emitting surface of the right second light source 20R, the image of the light emitting surface when passing through a surface that includes the lens focal point F3 and is perpendicular or substantially perpendicular to the lens optical axis Z, and the second lens unit The image of the light emitting surface when it is emitted from 32 and projected onto the screen is flipped horizontally and vertically. As a result, most of the reflected light L2R that has not been cut off by the shade 4 in the reflected light L2R passes on the right side with respect to the lens focal point F3. For this reason, most of the left second light distribution pattern P2L is projected in a wide range on the left side with respect to the vertical line VU-VD above and below the screen.

  On the other hand, as shown in FIGS. 1 and 7, the light L2L emitted from the left second light source 20L is directed to the left second focus F2L and the lens focus F3 on the left second reflecting surface 21L of the left second optical unit 2L. And reflected. A part of the reflected light L2L toward the second focus F2L on the left side and the lens focus F3 is cut off by the shade 4. The reflected light L <b> 2 </ b> L that has not been cut off by the shade 4 enters the incident surface 320 of the second lens unit 32 and exits from the exit surface 321 of the second lens unit 32. As shown in FIG. 8, the emitted light L2L is a diffusion type right second light distribution pattern (right low beam light distribution pattern) P2R having a cut-off line CL at the upper edge, and the lower side (front side) in front of the vehicle. Illuminate a wide range from the center to the right.

  Here, the left second optical unit 2L and the second lens portion 32 of the projection lens constitute a projector-type lamp unit. Therefore, in the image of the light emitting surface of the left second light source 20L, the image of the light emitting surface when passing through a surface that includes the lens focal point F3 and is perpendicular or substantially perpendicular to the lens optical axis Z, and the second lens unit The image of the light emitting surface when it is emitted from 32 and projected onto the screen is flipped horizontally and vertically. Thereby, in the reflected light L2L, most of the reflected light L2L that is not cut off by the shade 4 passes on the left side with respect to the lens focal point F3. For this reason, most of the right second light distribution pattern P2R is projected in a wide range on the right side with respect to the vertical line VU-VD on the upper and lower sides on the screen.

  Then, the second left light distribution pattern P2L shown in FIG. 6 and the second right light distribution pattern P2R shown in FIG. 8 are combined (superimposed). Then, as shown in FIG. 9, a passing beam light distribution pattern (low beam light distribution pattern) PL, which is a diffusion type second light distribution pattern having a cutoff line CL on the upper edge, is formed. This passing beam light distribution pattern PL illuminates the lower side (front side) of the front of the vehicle over a wide range from the center to the left and right.

  Next, the first light source 10 of the first optical unit 1 is simultaneously turned on simultaneously with the right second light source 20R and the left second light source 20L being simultaneously turned on. Then, as shown in FIGS. 1 and 3, the light L <b> 1 emitted from the first light source 10 is reflected by the first reflecting surface 11 of the first optical unit 1 in parallel or substantially in parallel. The parallel or substantially parallel reflected light L <b> 1 enters the incident surface 310 of the first lens unit 31 and exits from the exit surface 311 of the first lens unit 31. As shown in FIG. 4, the emitted light L1 illuminates the front (center) range in front of the vehicle as a condensing type first light distribution pattern (high beam light distribution pattern) P1.

  The first light distribution pattern P1 shown in FIG. 4 is a central portion of the passing beam light distribution pattern PL shown in FIG. 9, and is slightly lower to the upper side of the cutoff line CL of the passing beam light distribution pattern PL. The part is combined (superimposed). Then, as shown in FIG. 10, a traveling beam light distribution pattern (high beam light distribution pattern) PH is formed. This traveling beam light distribution pattern PH illuminates a limited range of the front (center) of the front side of the vehicle and a wide range from the center to the left and right of the lower side (front side) of the vehicle.

(Description of the effect of Embodiment 1)
The vehicle headlamp 100 according to the first embodiment is configured and operated as described above, and the effects thereof will be described below.

  In the vehicle headlamp 100 according to the first embodiment, in the lens 3, the first lens unit 31 is disposed above the second lens unit 32, and the thickness of the first lens unit 31 is the second of the projection lens. A lens thinner than the thickness of the lens part 32 is used. In the vehicle headlamp 100 according to the first embodiment, the first optical unit 1 is disposed in the center, and the first reflecting surface 11 is based on a paraboloid having the first light source 10 or its vicinity as a focal point F1. Are arranged so as to intersect the lens optical axis Z. For this reason, the vehicle headlamp 100 according to the first embodiment has a first lens unit 31 and the first optical unit 1, and is a condensing type first lamp compared to the vehicle headlamp disclosed in Patent Document 2. One light distribution pattern P1, for example, as shown in FIG. 4, light distribution design and light distribution control of a high beam light distribution pattern that illuminates the front (center) range in front of the vehicle can be easily performed.

  In the vehicle headlamp 100 according to the first embodiment, in the lens 3, the second lens unit 32 is disposed below the first lens unit 31, and a projection lens is used as the second lens unit 32. In the vehicle headlamp 100 according to the first embodiment, the right second optical unit 2R and the left second optical unit 2L are arranged on both the left and right sides of the first optical unit 1, respectively. Two light sources 20L or the vicinity thereof are a right first focus F1R and a left first focus F1L, and a lens focus F3 or a vicinity thereof is a right second focus F2R and a left second focus F2L. The second reflecting surface 21R and the left second reflecting surface 21L are arranged on the left and right sides of the first reflecting surface 11, and the shade 4 is disposed between the second lens unit 32 and the right second optical unit 2R and the left second optical unit 2L. Is to be placed. For this reason, the vehicle headlamp 100 according to the first embodiment includes the second lens unit 32 and the right second optical unit 2R, the left second optical unit 2L, and the shade 4, and the vehicle headlamp disclosed in Patent Document 1. Compared to a lamp, a passing beam light distribution pattern as a diffusion type second light distribution pattern in which a diffusion type left second light distribution pattern P2L and a diffusion type right second light distribution pattern P2R are combined (superposed) PL, for example, as shown in FIG. 9, it is possible to easily perform light distribution design and light distribution control of a low beam light distribution pattern that illuminates a wide range from the center to the left and right of the front lower side (front side) of the vehicle. .

  As described above, the vehicle headlamp 100 according to the first embodiment includes the light distribution design and light distribution control of the condensing type high beam light distribution pattern and the light distribution design and light distribution control of the diffusion type low beam light distribution pattern. Can be easily achieved.

  In the vehicle headlamp 100 according to the first embodiment, the right second optical unit 2 </ b> R and the left second optical unit 2 </ b> L are respectively disposed on the left and right sides of the first optical unit 1. Therefore, in the vehicle headlamp 100 according to the first embodiment, the lighting time of the right second light source 20R of the right second optical unit 2R and the left second light source 20L of the left second optical unit 2L is the first optical unit. Even when it is longer than the first first light source 10, heat generated in the right second light source 20R of the right second optical unit 2R and the left second light source 20L of the left second optical unit 2L is generated by the heat sink member 5. Can be efficiently discharged to the outside.

  In the vehicle headlamp 100 according to the first embodiment, the first lens unit 31 is located above the optical axis (lens optical axis) Z of the second lens unit 32. That is, the second lens portion 32 has an optical axis (lens optical axis) Z. For this reason, the vehicle headlamp 100 according to the first embodiment has a sufficient amount of light in the hot zone (high luminous intensity zone, high illuminance zone) of the low beam light distribution pattern PL when the low beam light distribution pattern PL is irradiated. Can get to. Moreover, the vehicular headlamp 100 according to the first embodiment receives the reflected light L2R from the right second optical unit 2R and the reflected light L2L from the left second optical unit 2L when the low beam distribution pattern PL is irradiated. It is possible to reliably prevent the light entering the entrance surface 310 of the first lens unit 31 and exiting from the exit surface 311 of the first lens unit 31 as outgoing light that is not subjected to light distribution control.

  In the vehicle headlamp 100 according to the first embodiment, the area of the first lens unit 31 is smaller than the area of the second lens unit 32. For this reason, the vehicle headlamp 100 according to the first embodiment is configured to reflect the reflected light L2R from the right second optical unit 2R and the reflected light from the left second optical unit 2L when the low beam distribution pattern PL is irradiated. It is possible to reliably prevent L2L from entering the entrance surface 310 of the first lens unit 31 and exiting from the exit surface 311 of the first lens unit 31 as exit light that is not subjected to light distribution control.

  In the vehicle headlamp 100 according to the first embodiment, the exit surfaces 311 and 321 of the lens 3 are convex aspheric surfaces, the lens 3 is circular or substantially circular in front view, and the first lens unit 31 is front It has a shape made up of a viewing-side arc and a lower string, and the lower string of the first lens portion 31 is inclined with an upward gradient from the inner side to the outer side of the vehicle. For this reason, the vehicle headlamp 100 according to the first embodiment can have a novel design.

  In the vehicle headlamp 100 according to the first embodiment, an optical element group is provided on at least one of the entrance surface 310 and the exit surface 311 of the first lens unit 31. For this reason, the vehicle headlamp 100 according to the first embodiment can easily perform the light distribution design and the light distribution control of the first light distribution pattern P1 emitted from the first lens unit 31 by the optical element group. Can do. Moreover, it is possible to prevent the portion behind the lens 3 from being seen from the outside through the first lens portion 31 in the vehicle headlamp 100 according to the first embodiment. That is, the optical element group is blinded.

(Description of configuration, action, and effect of embodiment 2)
11 and 12 show Embodiment 2 of a vehicle headlamp according to the present invention. Hereinafter, the configuration, operation, and effect of the vehicle headlamp 100A according to the second embodiment will be described. In the figure, the same reference numerals as those in FIGS. 1 to 10 denote the same components.

  In the vehicle headlamp 100 according to the first embodiment, the lens 3 has a circular shape or a substantially circular shape when viewed from the front, and the area of the first lens portion 31 (the area when viewed from the front) is the area of the second lens portion 32 ( Further, the exit surface 311 of the first lens unit 31 is a convex aspheric surface similar to the exit surface 321 of the second lens unit 32.

  In contrast, in the vehicle headlamp 100A according to the second embodiment, the lens 3A has a parallelogram in front view, and the area of the first lens unit 31 (area in front view) and the second lens unit 32. (The area in front view) is equivalent or substantially equivalent, and the exit surface 311 of the first lens unit 31 is flat with respect to the convex aspheric surface of the exit surface 321 of the second lens unit 32. is there. The exit surface 311 of the first lens portion 31 of the vehicle headlamp 100A in the second embodiment is the same as the exit surface 311 of the first lens portion 31 of the vehicle headlamp 100 in the first embodiment. Alternatively, a convex aspheric surface may be used.

  Here, in the vehicle headlamp 100A according to the second embodiment, the first lens unit 31 has an optical axis (lens light) of the second lens unit 32 as in the vehicle headlamp 100 according to the first embodiment. (Axis) Z is located on the upper side. That is, the second lens portion 32 has an optical axis (lens optical axis) Z. As a result, the vehicle headlamp 100A according to the second embodiment can achieve the same or substantially the same effect as the vehicle headlamp 100 according to the first embodiment.

(Description of examples other than Embodiments 1 and 2)
In the first and second embodiments, as the first light distribution pattern P1 of the condensing type, the high beam light distribution pattern P1 shown in FIG. 4 and the second light distribution pattern of the diffusion type having the cutoff line CL at the upper edge. P2R and P2L are the passing beam light distribution patterns PL shown in FIG. However, in the present invention, the first light distribution pattern P1 of the condensing type may be a light distribution pattern other than the high beam light distribution pattern P1 shown in FIG. 4, or a diffusion type having a cut-off line CL at the upper edge The second light distribution patterns P2R and P2L may be light distribution patterns other than the passing beam light distribution pattern PL shown in FIG.

  In the first and second embodiments, the first optical unit 1, the second right optical unit 2R, and the second left optical unit 2L are arranged side by side. However, in the present invention, the first optical unit 1, the second right optical unit 2R, and the second left optical unit 2L may be arranged to be shifted back and forth, up and down, or left and right.

  For example, the first optical unit 1 may be arranged behind the right second optical unit 2R and the left second optical unit 2L. That is, the first light source 10 and the first reflecting surface 11 of the first optical unit 1 are used as the right second light source 20R of the right second optical unit 2R, the right second reflecting surface 21R, and the left second light source of the left second optical unit 2L. You may arrange | position 20L and the rear side with respect to 21 L of left side 2nd reflective surfaces. In this case, the light distribution design and the light distribution control of the condensing type first light distribution pattern P1 obtained by the first optical unit 1 can be performed more easily.

  Further, the right second optical unit 2R and the left second optical unit 2L may be arranged on the rear side with respect to the first optical unit 1. That is, the right second light source 20R of the right second optical unit 2R, the right second reflecting surface 21R, the left second light source 20L of the left second optical unit 2L, and the left second reflecting surface 21L are the first of the first optical unit 1. The light source 10 and the first reflecting surface 11 may be disposed on the rear side. In this case, the arrangement of diffusion type second light distribution patterns P2R and P2L (passing beam light distribution patterns PL) having a cut-off line CL on the upper edge obtained by the right second optical unit 2R and the left second optical unit 2L. Light design and light distribution control can be performed more easily.

  Further, in the first and second embodiments, the first optical unit 1 is composed of one first light source 10 and one first reflecting surface 11. However, in the present invention, the first optical unit 1 may be composed of a plurality of first light sources 10 and a plurality of first reflecting surfaces 11.

  In the first and second embodiments, the right second optical unit 2R is composed of one right second light source 20R and one right second reflecting surface 21R. However, in the present invention, the right second optical unit 2R may be composed of a plurality of right second light sources 20R and a plurality of right second reflecting surfaces 21R.

  Furthermore, in the first and second embodiments, the left second optical unit 2L is composed of one left second light source 20L and one left second reflecting surface 21L. However, in the present invention, the left second optical unit 2L may be composed of a plurality of left second light sources 20L and a plurality of left second reflecting surfaces 21L.

100, 100A Vehicle headlamp 1 First optical unit 10 First light source 11 First reflecting surface 2R Right second optical unit 20R Right second light source 21R Right second reflecting surface 2L Left second optical unit 20L Left second light source 21L Left second reflecting surface 3, 3A Lens 31 First lens portion 310 Incident surface 311 Emission surface 32 Second lens portion 320 Incident surface 321 Emission surface 33 Flange portion 4 Shade 5 Heat sink member 50 Mounting portion 51 Heat radiation portion 6 Reflector 7 Substrate B Rear CL Cut-off line D Lower F Front F1 Focus F1R Right First Focus F1L Left First Focus F2R Right Second Focus F2L Left Second Focus F3 Lens Focus (Focus)
HL-HR Left and right horizontal lines on the screen L Left L1, L2R, L2L Light (reflected light, outgoing light)
P1 First light distribution pattern P2R Right second light distribution pattern P2L Left second light distribution pattern PH Traveling beam light distribution pattern PL Passing beam light distribution pattern R Right VU-VD Vertical line on the screen U Up Z Lens optical axis (optical axis)

Claims (7)

A lens, a first optical unit, a second optical unit, and a shade;
The lens and the first optical unit irradiate the first light distribution pattern of the condensing type in front of the vehicle,
A vehicle headlamp that irradiates a front side of a vehicle with a diffusion-type second light distribution pattern having a cutoff line on an upper edge by the lens, the second optical unit, and the shade,
The lens includes a first lens portion and a second lens portion, the first lens portion is disposed above the second lens portion, and the second lens portion is a focal point. And the optical axis, and the first lens portion is a lens whose thickness is thinner than the thickness of the second lens portion,
The first optical unit includes a first light source and a first reflection surface, and the first reflection surface is a reflection surface based on a paraboloid focusing on the first light source or its vicinity. In a plan view, the reflection is disposed so as to intersect the optical axis of the second lens unit, and reflects the light from the first light source so as to enter the incident surface of the first lens unit. Surface,
The second optical unit includes a second light source and a second reflecting surface, and is disposed on both sides of the first optical unit in a plan view, and the second reflecting surface is the second reflecting surface. A reflection surface based on an ellipsoid having a light source or the vicinity thereof as a first focal point and the second lens unit having the focal point or the vicinity thereof as a second focal point, and reflects light from the second light source A reflecting surface that is incident on the incident surface of the second lens unit,
The shade is disposed between the second lens unit and the second optical unit, and an upper edge of the shade forming the cut-off line is disposed at or near the focal point of the second lens unit. Being
A vehicle headlamp characterized by that. The first lens unit is located above the optical axis of the second lens unit.
The vehicle headlamp according to claim 1. The area of the first lens part is narrower than the area of the second lens part,
The vehicle headlamp according to claim 1 or 2, characterized in that The exit surface of the lens is a convex aspheric surface,
The lens has a circular shape or a substantially circular shape when viewed from the front,
The first lens portion has a shape composed of an upper arc and a lower chord or arc in front view,
The lower string or arc of the first lens portion is inclined with an upward slope from the inside to the outside of the vehicle,
The vehicle headlamp according to any one of claims 1 to 3, wherein An optical element group is provided on at least one of the entrance surface and the exit surface of the first lens unit.
The vehicle headlamp according to any one of claims 1 to 4, wherein The first optical unit is disposed on the rear side with respect to the second optical unit.
The vehicular headlamp according to any one of claims 1 to 5, wherein The second optical unit is disposed on the rear side with respect to the first optical unit,
The vehicular headlamp according to any one of claims 1 to 5, wherein

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