JP6519353B2 - Vehicle headlights - Google Patents

Description

  According to the present invention, it is possible to switch between a low beam distribution pattern (low beam distribution pattern) and a traveling beam distribution pattern (high beam distribution pattern) for the light distribution pattern irradiated to the front of the vehicle. It concerns lighting.

  There are conventional vehicle headlamps of this type (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 of Patent Document 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 first reflecting surface of a rotating ellipsoidal system, 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 second reflecting surface of a rotating ellipsoidal system, and is disposed on the rear side of the left and right second lens portions.

  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 central A portion of the light is cut off by the first shade, 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 pattern of high light condensing (spot-like) high illuminance. Further, in the vehicle headlamp of Patent Document 1, when the left and right second semiconductor light emitting elements are turned on simultaneously with the turning on of the first semiconductor light emitting element at the center, the light from the left and right second semiconductor light emitting elements is (2) The light is reflected by the reflecting surface, and the reflected light is transmitted through the left and right second lens portions and irradiated to the front of the vehicle as a light distribution pattern for high beam. This high beam light distribution pattern is a pattern of high light collecting (spot-like) high illuminance. Then, a composite pattern for high beam in which the low beam distribution pattern and the high beam distribution pattern are superimposed is formed.

  The vehicle headlamp according to 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 is transmitted through the projection lens to arrange the low beam. It is illuminated in front of the vehicle as a light pattern. 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 below the projection lens and is irradiated to the front of the vehicle as a high beam distribution pattern. Ru. The light distribution pattern for high beam of the parabola optical system is a light distribution pattern diffused more than the light distribution pattern for low beam of the projector optical system, and complements the periphery of the light distribution pattern for low beam.

JP, 2013-152855, A JP 2009-301980 A

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

  Since the vehicle headlamp of Patent Document 2 extends the parabolic optical system reflector below the projector optical system reflector, it has a light distribution pattern 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 of a parabolic optical system that complements the periphery of a low beam light distribution pattern, but is suitable for light distribution design and light distribution control of a light collecting type high beam light distribution pattern. There is a problem.

  The problem to be solved by the present invention is to easily make light distribution design and light distribution control of high beam light distribution pattern of light collecting type and light distribution design and light distribution control of low beam light distribution pattern of diffusion type compatible. It is an object of the present invention to provide a vehicle headlamp that can

  The present invention (the invention according to claim 1) comprises 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 vehicular headlamp that irradiates the front of the vehicle with a diffusion type second light distribution pattern having a cutoff 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, and the first lens portion is disposed on the upper side with respect to the second lens portion, and the second lens portion has a focal point and an optical axis. A first lens unit having a thickness smaller than that of a second lens unit, and a first optical unit having a first light source and a first reflecting surface, The first reflecting surface is a parabola whose focal point is the first light source or its vicinity And is disposed to intersect 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 second optical unit has 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 reflecting surface to be incident. A second light source or a reflecting surface based on an elliptical surface having the second focal point as the first focal point and the focal point of the second lens unit as the second focal point, the light from the second light source being reflected And the shade is disposed between the second lens unit and the second optical unit, and the upper edge of the shade forming the cutoff line is The lens unit is located at or near the focal point , Characterized in that.

  This invention (the invention according to claim 2) is characterized in that the first lens portion is located on the upper side with respect to the optical axis of the second lens portion.

  In the invention (the invention according to claim 3), the area of the first lens unit is narrower than the area of the second lens unit.

  In the present invention (the invention according to claim 4), the exit surface of the lens is a convex aspheric surface, the lens is circular or substantially circular in a front view, and the first lens portion is an arc and a lower side of the upper side in a front view And the lower chord or arc of the first lens portion is inclined in an upward slope from the inside to the outside 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 or 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 disposed on the rear side with respect to the second optical unit.

  This 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 above the second lens portion, and a lens having a thickness smaller than that of the second lens portion of the projection lens is formed as the first lens portion. The first optical unit is disposed at the center, and the first reflective surface based on the paraboloid whose focal point is the first light source or its vicinity is disposed to intersect the optical axis of the second lens unit It is a thing. To this end, the vehicle headlamp according to the present invention has a first light distribution pattern of a light collecting type by the first lens unit and the first optical unit, as compared with the vehicle headlamp of 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 range of the front (center) of the 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 used on both sides of the first optical unit. The second reflecting surface is based on an elliptical surface having the second light source or its vicinity as the first focal point, and the focal point of the second lens unit or its vicinity as the second focal surface 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 vehicle headlamp according to the present invention has a diffusion type second light distribution pattern compared to the vehicle headlamp according to Patent Document 1 by the second lens unit, the second optical unit, and the shade. For example, it is possible to easily perform light distribution design and light distribution control of a low beam light distribution pattern (see FIG. 9) which illuminates a wide range from the center to the left and right in front lower side (front side) of the vehicle.

  Thus, the vehicle headlamp according to the present invention includes the light distribution design and light distribution control of the high beam light distribution pattern of the light collecting type, and the light distribution design and light distribution control of the low beam light distribution pattern of the diffusion type. It can be easily compatible.

FIG. 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 I-I in FIG. FIG. 2 is a front view showing the lens and is a view on arrow II in FIG. FIG. 3 is a schematic vertical 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 view showing a first light distribution pattern (high beam distribution pattern) of a light collecting type irradiated to the front of the vehicle by the first lens unit and the first optical unit shown in FIG. FIG. 5 is a schematic longitudinal sectional view (schematic vertical sectional view) showing the lens, the second optical unit on the right side, and the shade, and is a schematic sectional view taken along line V-V in FIG. FIG. 6 is an explanatory view showing a diffusion type second left light distribution pattern (left low beam light distribution pattern) irradiated to the front of the vehicle by the second lens unit shown in FIG. 5, the second optical unit on the right, and the shade. It is. 7 is a schematic longitudinal sectional view (schematic vertical sectional view) showing the lens, the second optical unit on the left side, and the shade, and is a schematic sectional view taken along the line VII-VII in FIG. FIG. 8 is an explanatory view showing a diffusion-type second light distribution pattern on the right side of the vehicle (a low-beam light distribution pattern on the right) which is illuminated in front of the vehicle by the second lens unit shown in FIG. It is. FIG. 9 is an explanatory view showing a low beam light distribution pattern (low beam light distribution pattern) in which the second light distribution pattern on the left side shown in FIG. 6 and the second light distribution pattern on the right side shown in FIG. FIG. 10 illustrates a traveling beam distribution pattern (high beam distribution pattern) obtained by combining (superimposing) the first light distribution pattern shown in FIG. 4 and the low beam distribution pattern (low beam distribution pattern) shown in FIG. FIG. FIG. 11 is a front view of a lens showing a second embodiment of the vehicle headlamp according to the present 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 an embodiment (example) of a vehicle headlamp according to the present invention will be described in detail based on the drawings. The present invention is not limited by this embodiment. In the present specification and the appended claims, front, rear, upper, lower, left and right are front, rear, upper, lower, when the vehicle headlamp according to the present invention is mounted on a vehicle. Left, right. In FIG. 1 to FIG. 3, FIG. 5, FIG. 7, FIG. 11, FIG. 12, the code "F" is "front", "B" is "rear", "U" is "upper" and "D" is "lower". "," "L" is "left", "R" is "right".

  In FIG.4, FIG.6, FIG.8-FIG. 10, code | symbol "VU-VD" shows the vertical line on the upper and lower sides on a screen. The code "HL-HR" indicates the left and right horizontal lines on the screen. FIG.4, FIG.6, FIG.8 and FIG. 9 are explanatory drawings of the isointensity curve (iso-illumination curve) which simplifies and shows the light distribution pattern on a screen. In the explanatory drawing of this isointensity curve (iso-illumination curve), the central iso-intensity curve (iso-illumination curve) shows high luminosity (high irradiance) and the outer iso-intensity curve (iso-illumination curve) shows low luminosity ( Low illumination). The hatching of the cross section of the lens is omitted in FIGS. 1, 3, 5, 7 and 12.

(Description of Configuration of Embodiment 1)
1 to 10 show a first embodiment of a vehicle headlamp according to the present invention. Hereinafter, the configuration of the vehicular headlamp 100 in the first embodiment will be described. This example describes, for example, a headlamp of a motor vehicle headlamp.

(Description of the vehicle headlamp 100)
The vehicle headlamps 100 are mounted on the left and right sides of the front portion of a vehicle (not shown). Hereinafter, the vehicular 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 side 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 (e.g., a transparent outer lens, etc.) 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 light axis adjustment mechanism (not shown), and a horizontal light axis adjustment mechanism (not shown).

  As shown in FIG. 1, FIG. 3 and FIG. 4, the vehicle headlamp 100 is configured such that the first light distribution pattern P1 of the condensing type is made forward of the vehicle by the lens 3 and the first optical unit 1. Irradiate. The first light distribution pattern P1 is, in this example, a high beam light distribution pattern that illuminates a range in front of the vehicle (center).

  As shown in FIGS. 1, 5 and 6, the vehicle headlamp 100 is a diffusion type having a cut-off line CL at its upper edge by the lens 3, the right second optical unit 2R, and the shade 4. The left second light distribution pattern P2L is emitted to the 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 on the lower front side (front side) of the vehicle.

  As shown in FIGS. 1, 7 and 8, the vehicle headlamp 100 is a diffusion type having a cut-off line CL at its upper edge by the lens 3, the left second optical unit 2L, and the shade 4. The right second light distribution pattern P2R is emitted to the front of the vehicle. The right side second light distribution pattern P2R in this example is a right side low beam light distribution pattern which 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 right second light distribution pattern P2R shown in FIG. 8 are combined (superimposed). Then, a low beam light distribution pattern PL shown in FIG. 9 is formed. The low beam distribution pattern PL is a diffusion type second light distribution pattern having a cutoff line CL at the upper edge. The low beam distribution pattern PL is, in this example, a low beam distribution pattern which illuminates a wide range from the center to the left and right of the front lower side (front side) of the vehicle.

  The cut-off line CL in this example comprises a horizontal cut-off line and an oblique cut-off line. As the cut-off line, there is a cut-off line consisting of a lower horizontal cut-off line, an oblique cut-off line, and an upper horizontal cut-off line, in addition to the cut-off line CL.

  The first light distribution pattern P1 shown in FIG. 4 is a central portion of the low beam light distribution pattern PL shown in FIG. 9, and the upper side of the low beam light distribution pattern PL is slightly above the cutoff line CL. Synthesize (superimpose) on the part of the area. Then, as shown in FIG. 10, a traveling beam light distribution pattern PH is formed. The traveling beam light distribution pattern PH is a high beam light distribution pattern which illuminates a limited range in front of the vehicle (center) and a wide range from the center to the left and right in 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 and FIGS. 5 and 7, the lens 3 is surrounded by the first lens portion 31, the second lens portion 32, and the first lens portion 31 and the second lens portion 32. And an annular flange portion 33 of

  The first lens unit 31 is disposed above 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”) F 3, an optical axis (hereinafter referred to as “lens optical axis”) Z, an incident surface 320 and an outgoing surface 321. . The first lens portion 31 is a lens whose thickness (plate thickness) is thinner than the thickness of the second lens portion 32. The first lens portion 31 is provided at 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 does not have a focal point and an optical axis, but is a lens having 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 substantially circular in a front view (see FIG. 2). The area of the first lens unit 31 (area in front view) is narrower than the area of the second lens unit 32 (area in front view).

  The first lens portion 31 has a shape including an arc on the upper side in a front view and a chord on the lower side. The first lens unit 31 is located above 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.

  As shown by the two-dot chain line in FIG. 2A, a part of the lower chord of the first lens portion 31 is inclined in an upward slope from the inside (right side) to the outside (left side) of the vehicle. ing. As shown in FIG. 2 (B), all of the lower strings of the first lens portion 31 may be inclined in an upslope from the inside (right side) to the outside (left side) of the vehicle. . Further, the shape of the lower side of the first lens unit 31 in a front view may be an arc other than the above-described chord.

  An optical element group (shown by a vertical broken line in FIG. 2) on at least one of the light incident surface 310 or the light emission surface 311 of the first lens unit 31 (preferably, the light incident surface 310) Is provided. The optical element group is a cross-sectional arc or a vertical prism (longitudinal prism, vertical triangular prism) group of two sides, a fish-eye prism group, or a textured surface subjected to embossing. .

(Description of the First Optical Unit 1)
The first optical unit 1 has a first light source 10 and a first reflecting surface 11 as shown in FIGS. 1 and 3.

  The first light source 10 is, in this example, a self-emitting semiconductor type light source (semiconductor type light source) such as an LED, an OEL, or an OLED (organic EL). The first light source 10 is mounted at the center of the substrate 7 and 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 disposed on the lens optical axis Z such that the longitudinal direction of the light emitting surface is orthogonal to or substantially orthogonal to the lens optical axis Z.

  The first reflection surface 11 is provided at a central portion of the surface of the reflector 6 facing the first light source 10. The first reflective surface 11 is a reflective surface based on a parabolic surface whose focal point F1 is the first light source 10 or its vicinity. The focal point F1 coincides with or substantially coincides with the center of the light emitting surface.

  The first reflection surface 11 is disposed to intersect with the lens optical axis Z in plan view, as shown in FIG. That is, the first reflection surface 11 covers (crosses over) the lens optical axis Z. The first reflection surface 11 is a reflection surface that reflects the light L1 from the first light source 10 and causes the light L1 to be incident on the incident surface 310 of the first lens unit 31.

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

  The right side second light source 20R and the left side second light source 20L are, for example, self-emitting semiconductor type light sources (semiconductor type light sources) such as LEDs, OELs or OLEDs (organic EL) in this example. The right side second light source 20R and the left side second light source 20L 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 side second light source 20R and the left side second light source 20L have rectangular light emitting surfaces. The light emitting surface faces upward. The right side second light source 20R and the left side second light source 20L are disposed on the left and right sides of the first light source 10 such that the longitudinal direction of the light emitting surface is orthogonal or substantially orthogonal to the lens optical axis Z. ing.

  The right side second reflection surface 21R and the left side second reflection surface 21L are both right and left sides of the first reflection surface 11 in the central portion of the reflector 6, and the right side second light source 20R and the left side second light source 20L. And the left and right sides of the surface facing the The right side second reflection surface 21R and the left side second reflection surface 21L have the right side second light source 20R and the left side second light source 20L or their vicinity as a right side first focal point F1R and a left side first focal point F1L, It is a reflecting surface based on an elliptical surface having the lens focus F3 or its vicinity as the right second focus F2R and the left second focus F2L.

  The right side first focal point F1R, the left side first focal point F1L, the center of the light emitting surface of the right side second light source 20R, and the center of the light emitting surface of the left side second light source 20L coincide or substantially coincide. The right second focal point F2R and the left second focal point F2L coincide or substantially coincide.

  The right side second reflection surface 21R and the left side second reflection surface 21L reflect lights L2R and L2L from the right side second light source 20R and the left side second light source 20L, and the light incident surface of the second lens unit 32 It is a reflective surface to be incident on 320.

  The right side second optical unit 2R and the second lens unit 32 of the projection lens constitute a projector type lamp unit. The left second optical unit 2L and the second lens unit 32 of the projection lens similarly constitute a projector type lamp unit. For this purpose, 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 substantially perpendicular to the lens optical axis Z The image of the light emitting surface when passing through the first surface and the image of the light emitting surface when emitted from the second lens unit 32 and projected onto the screen are horizontally and vertically inverted.

(Description of shade 4)
The shade 4 is composed 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 forming the cutoff line CL is disposed at or near the lens focus F3.

(Description of the heat sink member 5)
The heat sink member 5 is made of, for example, a material having a high thermal conductivity. The heat sink member 5 is composed of a plate-shaped mounting portion 50 and a fin-shaped heat radiating 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 Further, the shade 4 and the reflector 6 are attached.

  The heat sink member 5 releases the 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 R, the left second light source 20 L, the substrate 7, the shade 4 and the reflector 6. 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 a front portion and a lower portion are open, and a rear portion, an upper portion, and both left and right portions are closed. The concave inner surface of the closed portion of the reflector 6 is provided with the first reflection surface 11, the right side second reflection surface 21R, and the left side second reflection surface 21L.

(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 side second light source 20R of the right side second optical unit 2R and the left side second light source 20L of the left side second optical unit 2L are simultaneously lighted.

  Then, as shown in FIGS. 1 and 5, the light L2R emitted from the right side second light source 20R is directed to the right side second focal point F2R and the lens focus F3 at the right side second reflecting surface 21R of the right side second optical unit 2R. Is reflected. A portion of the reflected light L2R directed to the right second focal point F2R and the lens focal point F3 is cut off by the shade 4. The reflected light L 2 R not cut off by the shade 4 is incident on the incident surface 320 of the second lens unit 32 and is emitted from the emission surface 321 of the second lens unit 32. The emitted light L2R, as shown in FIG. 6, is a diffusion type second left light distribution pattern (left low beam light distribution pattern) P2L having a cut-off line CL at the upper edge, the lower side (front side) in front of the vehicle. Shine a wide range from the center to the left side.

  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 purpose, in the image of the light emitting surface of the right side second light source 20R, the image of the light emitting surface when passing through a surface including the lens focal point F3 and perpendicular or almost perpendicular to the lens optical axis Z, and the second lens portion The image of the light emitting surface when emitted from the light source 32 and projected onto the screen is reversed horizontally and vertically. Thereby, in the reflected light L2R, most of the reflected light L2R not cut off by the shade 4 passes the right side with respect to the lens focus F3. For this reason, most of the left second light distribution pattern P2L is projected to a wide range on the left side with respect to the upper and lower vertical lines VU-VD on the screen.

  On the other hand, as shown in FIGS. 1 and 7, the light L2L emitted from the left side second light source 20L is directed to the left side second focus F2L and the lens focus F3 at the left side second reflection surface 21L of the left side second optical unit 2L. Is reflected. A part of the reflected light L2L directed to the left second focus F2L and the lens focus F3 is cut off by the shade 4. The reflected light L 2 L not cut off by the shade 4 is incident on the incident surface 320 of the second lens unit 32 and is emitted from the emission surface 321 of the second lens unit 32. The outgoing light L2L is, as shown in FIG. 8, a diffusion type second right light distribution pattern (right low beam light distribution pattern) P2R having a cutoff line CL at the upper edge, the lower side (front side) of the front of the vehicle. Shine a wide range from the center to the right.

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

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

  Next, simultaneously with the simultaneous lighting of the right side second light source 20R and the left side second light source 20L, the first light source 10 of the first optical unit 1 is simultaneously turned on. Then, as shown in FIG. 1 and FIG. 3, the light L 1 emitted from the first light source 10 is reflected by the first reflection surface 11 of the first optical unit 1 in parallel or substantially in parallel. The parallel or substantially parallel reflected light L 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. The emitted light L1 illuminates a range in front of the vehicle (center) as a first light distribution pattern (high beam distribution pattern) P1 of a light collecting type as shown in FIG.

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

(Description of the effect of Embodiment 1)
The vehicle headlamp 100 according to the first embodiment has the above-described configuration and operation, 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 portion 32 is used. In the vehicle headlamp 100 according to the first embodiment, the first optical unit 1 is disposed at the center, and the first light reflecting surface 11 is based on a paraboloid whose focal point F1 is the first light source 10 or its vicinity. Are arranged to intersect the lens optical axis Z. For this reason, the vehicle headlamp 100 according to the first embodiment is different from the vehicle headlamp according to Patent Document 2 by the first lens unit 31 and the first optical unit 1 in the light collecting type. 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 range of the front (center) of the front of the vehicle can be easily performed.

  In the vehicle headlamp 100 in 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 disposed on the left and right sides of the first optical unit 1, respectively. The second light source 20L or its vicinity is the first right focal point F1R and the left first focal point F1L, and the right side first 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 2 reflection surface 21R, left side second reflection surface 21L are disposed on the left and right sides of the first reflection surface 11, and shade 4 is interposed between the second lens portion 32 and the right side second optical unit 2R and left side second optical unit 2L. It is to arrange. For this reason, the vehicle headlamp 100 according to the first embodiment includes the vehicle front light of Patent Document 1 by the second lens portion 32, the right second optical unit 2R, the left second optical unit 2L, and the shade 4. Low-beam light distribution pattern as a second light distribution pattern of the diffusion type in which the second light distribution pattern P2L on the left of the diffusion type and the second light distribution pattern P2R on the right of the diffusion type are combined (superimposed) PL, for example, as shown in FIG. 9, 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 in front lower side (front side) of the vehicle can be performed easily .

  As described above, the vehicle headlamp 100 according to the first embodiment includes the light distribution design and light distribution control of the high beam light distribution pattern of the light collecting type, and the light distribution design and light distribution control of the low beam light distribution pattern of the diffusion type. And can easily be made compatible.

  The vehicle headlamp 100 according to the first embodiment is configured such that the right side second optical unit 2R and the left side second optical unit 2L are disposed on the left and right sides of the first optical unit 1, respectively. For this purpose, in the vehicle headlamp 100 according to the first embodiment, the lighting time of the right side second light source 20R of the right side second optical unit 2R and the lighting time of the left side second light source 20L of the left side second optical unit 2L are the first optical unit Even when the first light source 10 is longer than the first light source 10, the heat generated in the right side second light source 20R of the right side second optical unit 2R and the left side second light source 20L of the left side second optical unit 2L is a heat sink member 5 Can be discharged to the outside efficiently.

  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 unit 32 has an optical axis (lens optical axis) Z. For this purpose, the vehicle headlamp 100 according to the first embodiment has sufficient light intensity of the hot zone (high intensity band, high illuminance band) of the low beam light distribution pattern PL at the time of irradiation of the low beam light distribution pattern PL. Can be obtained. Moreover, in the vehicle headlamp 100 in the first embodiment, when the low beam light distribution pattern PL is irradiated, the reflected light L2R from the right second optical unit 2R and the reflected light L2L from the left second optical unit 2L It is possible to reliably prevent emission from the emission surface 311 of the first lens unit 31 as emission light which is incident on the incident surface 310 of the first lens unit 31 and 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 narrower than the area of the second lens unit 32. For this reason, the vehicle headlamp 100 according to the first embodiment reflects the reflected light L2R from the right second optical unit 2R and the reflected light from the left second optical unit 2L at the time of irradiation of the low beam light distribution pattern PL. It is possible to reliably prevent L2L from entering the incident surface 310 of the first lens unit 31 and exiting from the exit surface 311 of the first lens unit 31 as outgoing light whose light distribution is not controlled.

  In the vehicle headlamp 100 according to the first embodiment, the exit surfaces 311 and 321 of the lens 3 form a convex aspheric surface, the lens 3 is circular or substantially circular in a front view, and the first lens portion 31 is a front surface. An upper arc and a lower chord are formed, and the lower chord of the first lens portion 31 is inclined in an upward slope from the inside to the outside of the vehicle. For this reason, the vehicle headlamp 100 in the first embodiment can obtain 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 incident surface 310 and the exit surface 311 of the first lens unit 31. For this purpose, the vehicle headlamp 100 according to the first embodiment facilitates 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. In addition, it is possible to prevent a portion behind the lens 3 in the interior of the vehicle headlamp 100 according to the first embodiment from being visible through the first lens portion 31 from the outside. That is, the optical element group becomes blindfolded.

(Description of the configuration, operation, and effects of the second embodiment)
11 and 12 show a second embodiment of the vehicular headlamp according to the present invention. The configuration, operation, and effects of the vehicle headlamp 100A in the second embodiment will be described below. In the drawings, the same reference numerals as in FIGS. 1 to 10 denote the same components.

  In the vehicle headlamp 100 according to the first embodiment, the lens 3 is circular or substantially circular in a front view, and the area of the first lens unit 31 (the area in front view) is an area of the second lens unit 32 The light emission surface 311 of the first lens unit 31 has a convex aspheric surface in the same manner as the light emission surface 321 of the second lens unit 32.

  On the other hand, in the vehicle headlamp 100A according to the second embodiment, the lens 3A forms a parallelogram in a front view, and the area of the first lens unit 31 (the area in front view) and the second lens unit 32. Area (area in a front view) is equal to or substantially equal to that of the first lens portion 31, and the emission surface 311 of the first lens portion 31 is flat with respect to the convex aspheric surface of the emission surface 321 of the second lens portion 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. And a convex aspheric surface may be formed.

  Here, in the vehicle headlamp 100A according to the second embodiment, as in the vehicle headlamp 100 according to the first embodiment, an optical axis of the second lens unit 32 (lens light of the first lens unit 31 (lens light Axis) is located above the Z axis. That is, the second lens unit 32 has an optical axis (lens optical axis) Z. As a result, here, the vehicle headlamp 100A according to the second embodiment can achieve the same or substantially the same function and 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, it is a high beam light distribution pattern P1 shown in FIG. 4 as the first light distribution pattern P1 of the light collection type, and a second light distribution pattern of the diffusion type having the cutoff line CL at the upper edge The passing beam distribution pattern PL shown in FIG. 9 as P2R and P2L. However, in the present invention, a light distribution pattern other than the high beam light distribution pattern P1 shown in FIG. 4 may be used as the first light distribution pattern P1 of the light collection type, or a diffusion type having the cut-off line CL at the upper edge Light distribution patterns other than the low beam light distribution pattern PL shown in FIG. 9 may be used as the second light distribution patterns P2R and P2L.

  In the first and second embodiments, the first optical unit 1, the right second optical unit 2R, and the left second optical unit 2L are arranged side by side. However, in the present invention, the first optical unit 1, the right side second optical unit 2R, and the left side second 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 disposed on the rear side with respect to the right side second optical unit 2R and the left side second optical unit 2L. That is, the first light source 10 and the first reflecting surface 11 of the first optical unit 1 correspond to the second light source 20R on the right side of the second optical unit 2R on the right side, the second light source 21R on the right side and the second light source on the left side 20 L, it may be disposed on the rear side with respect to the left second reflection surface 21L. In this case, the light distribution design and the light distribution control of the first light distribution pattern P1 of the condensing type obtained by the first optical unit 1 can be further easily performed.

  In addition, the right side second optical unit 2R and the left side second optical unit 2L may be disposed 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 reflection surface 21R, the left second light source 20L of the left second optical unit 2L, and the left second reflection surface 21L It may be disposed on the rear side with respect to the light source 10 and the first reflection surface 11. In this case, the distribution of diffusion type second light distribution patterns P2R and P2L (low beam light distribution pattern PL) having a cutoff line CL at the upper edge obtained by the right side second optical unit 2R and the left side second optical unit 2L. Light design and light distribution control can be performed more easily.

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

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

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

100, 100A Vehicle headlight 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 reflection surface 3, 3A lens 31 first lens portion 310 entrance surface 311 exit surface 32 second lens portion 320 entrance surface 321 exit surface 33 flange portion 4 shade 5 heat sink member 50 attachment portion 51 heat dissipation portion 6 reflector 7 substrate B After CL Cut-off D Bottom F Front F1 Focus F1 R Right First Focus F1 L Left First Focus F2 R Right Second Focus F2 L Left Second Focus F3 Lens Focus (Focus)
Left and right horizontal lines on the HL-HR screen L Left L1, L2R, L2L light (reflected light, emitted 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 upper and lower vertical lines on the screen U upper Z lens optical axis (optical axis)

Claims (7)

A lens, a first optical unit, a second optical unit, and a shade;
The first light distribution pattern of the condensing type is irradiated to the front of the vehicle by the lens and the first optical unit,
A vehicular headlamp that emits a diffusion type second light distribution pattern having a cutoff line at its upper edge by the lens, the second optical unit, and the shade to the front of the vehicle,
The lens has a first lens unit and a second lens unit, the first lens unit is disposed on the upper side with respect to the second lens unit, and the second lens unit 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 has a first light source and a first reflecting surface, and the first reflecting surface is a reflecting surface based on a paraboloid whose focal point is the first light source or its vicinity. And, in plan view, disposed so as to intersect with the optical axis of the second lens unit, and reflect light from the first light source to be incident on the incident surface of the first lens unit It is a face,
The second optical unit has a second light source and a second reflecting surface, and is arranged on both sides of the first optical unit in plan view, and the second reflecting surface is the second A reflecting surface based on an elliptical surface having a light source or its vicinity as a first focal point, and the focal point of the second lens unit or its vicinity as a second focal point, wherein light from the second light source is reflected And a reflecting surface to be 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 the upper edge of the shade forming the cutoff line is disposed at or near the focal point of the second lens unit. Being
Vehicle headlights characterized by The first lens unit is located above the optical axis of the second lens unit.
The vehicular headlamp according to claim 1, characterized in that: The area of the first lens portion is narrower than the area of the second lens portion
Vehicle headlamp according to claim 1 or 2, characterized in that. The exit surface of the lens has a convex aspheric surface,
The lens is circular or substantially circular in a front view.
The first lens portion has a shape including an arc on the upper side in a front view and a chord or an arc on the lower side,
The lower chord or arc of the first lens portion is inclined in an upward slope from the inside to the outside of the vehicle.
The vehicle headlamp according to any one of claims 1 to 3, characterized in that: An optical element group is provided on at least one of the incident surface or the exit surface of the first lens unit.
Vehicle headlamp according to any one of claims 1 to 4, characterized in that. 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, characterized in that: 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, characterized in that:

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