JP2020053215A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture capable of shading off a cutoff line properly.SOLUTION: A vehicular lighting fixture includes: a first light source for emitting light for low-beam light distribution; a lens arranged on the front side of the first light source; a shade arranged between the first light source and the lens and for forming a cutoff line of a low-beam light distribution pattern; and a reflector for reflecting the light from the first light source to the lens side. The lens includes: an incident surface where the light enters; and an emission surface for radiating the light to the front side. The incident surface includes: a first light diffusion part provided in a central side region where the light enters radiated in a predetermined range in the horizontal direction from the vertical reference line on a screen; and a second light diffusion part provided in the central side region and continued to the lower side of the first light diffusion part. The boundary between the first light diffusion part and the second light diffusion part is located in the first range in the vertical direction for allowing the light radiated on the cutoff line of the incident surface to enter, and the second light diffusion part has diffusion width larger than that of the first light diffusion part.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a vehicular lamp.

  Patent Literature 1 discloses a light source having an optical axis extending substantially horizontally forward in the light irradiation direction, a concave elliptical reflection surface opening forward in the light irradiation direction, and an elliptical reflection surface on the optical axis. A projection lens disposed in front of the light irradiation direction, and the elliptical reflection surface has a first focal position located near the light source so as to reflect light from the light source toward the front in the light irradiation direction. The projection lens is arranged in a state where the second focus position is located on the optical axis, and the projection lens has a convex optical surface in the front in the light irradiation direction and a flat optical surface in the rear in the light irradiation direction. The focal position on the rear side in the irradiation direction is arranged near the second focal position, and a predetermined area at the center in the vertical direction on the optical surface behind the light irradiation direction extends in the horizontal direction. There are multiple pillar-shaped curved parts that are Vehicle headlamp, characterized in that it is protrusively provided is disclosed.

  In Patent Document 1, the projection lens has a convex optical surface in the front in the light irradiation direction and a flat optical surface in the rear in the light irradiation direction. In the predetermined area, a plurality of column-shaped curved portions extending in the horizontal direction and arranged in the vertical direction are recessed or projected, so that the light is emitted from the light source and enters the optical surface behind the light irradiation direction. Of the light, the light incident on the central portion is refracted in the vertical direction by each curved portion, and even if a cutoff is formed by blocking a part of the light by the light blocking member, the curved portion It is described that a light-dark boundary can be blurred by such a simple configuration.

JP 2012-199156 A

  However, when a columnar body having a semicircular cross section extending in the horizontal direction is provided on the back surface (incident surface) of the lens as shown in Patent Document 1, there is a possibility that the cutoff line may be blurred more than necessary. is there.

  The present invention has been made in view of such circumstances, and has as its object to provide a vehicular lamp that can appropriately blur a cutoff line.

The present invention is grasped by the following configurations to achieve the above object.
(1) A vehicular lamp according to the present invention includes a first light source that emits light for low beam light distribution, a lens disposed in front of the first light source, and disposed between the first light source and the lens. A shade that forms a cut-off line of a low-beam light distribution pattern, and a reflector that reflects light from the first light source toward the lens, wherein the lens has an incident surface on which light is incident, and an incident light. A light exit surface that irradiates the light to the front side, and the incident surface is provided in a central region where light irradiated within a predetermined range in the horizontal direction from a vertical reference line on the screen is incident. A light diffusing unit; and a second light diffusing unit provided in the central region and connected to a lower side of the first light diffusing unit, wherein the first light diffusing unit and the second light The boundary of the diffuser is illuminated on the cut-off line of the entrance surface. Located within the first range of vertical for applying light, the second light diffusion portion is diffused width of the light is greater than the first light diffusion unit.

(2) In the configuration of (1), a boundary between the first light diffusion unit and the second light diffusion unit is provided at a substantially middle position in the vertical direction of the first range.

(3) In the configuration according to the above (1) or (2), the vehicular lamp includes a second light source that is disposed between the first light source and the lens, and that emits light for high beam additional light distribution. The incident surface includes a third light diffuser provided at least in a region where light from the first light source and the second light source is incident on a laterally outer region continuous with the central region. The light diffusion portion has the same light diffusion width as the light diffusion width of the first light diffusion portion.

(4) In the configuration of (3), the first light diffusing portion is provided up to an upper end in the vertical direction of the incident surface, and the second light diffusing portion is disposed in a vertical direction of the incident surface. The third light diffusion portion is provided to the lower end, and is provided over the entire outer region of the incident surface.

(5) In any one of the constitutions (1) to (4), the light diffusing portion includes a rhombic prism formed so as to protrude from the incident surface and provided so as to be continuous without a gap. Is set by the protrusion height of the rhombic prism.

(6) In the configuration according to any one of (1) to (5), the central region is a region where light irradiated to a range within 10 degrees in a horizontal direction from a vertical reference line on the screen is incident. It is.

(7) In any one of the above constitutions (1) to (6), a boundary between the first light diffusing portion and the second light diffusing portion is vertically at least 5 mm below a lens optical axis of the lens. Located on the side.

  According to the present invention, it is possible to provide a vehicular lamp capable of appropriately blurring a cutoff line.

It is a top view of the vehicles provided with the vehicular lamp of an embodiment concerning the present invention. It is a side view of a lamp unit of an embodiment concerning the present invention. It is sectional drawing of the lamp unit of embodiment which concerns on this invention. It is a partial exploded perspective view of the lamp unit of the embodiment according to the present invention. FIG. 3 is an exploded perspective view of a part of the lamp unit according to the embodiment of the present invention except for a lens and a lens holder. It is the figure which showed typically the light distribution pattern projected on the screen of embodiment which concerns on this invention. It is a figure showing the entrance surface of the lens (lens part) of an embodiment concerning the present invention. It is a figure for explaining how a cut-off line is blurred by the 1st light diffusion part and the 2nd light diffusion part of an embodiment concerning the present invention.

Hereinafter, a mode for carrying out the present invention (hereinafter, referred to as “embodiment”) will be described in detail with reference to the accompanying drawings.
The same elements are denoted by the same reference numerals or symbols throughout the description of the embodiments.

In the embodiment and the drawings, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle, respectively, and “up”, “down”, and “left” unless otherwise specified. "And" right "respectively indicate the directions as seen from the driver getting on the vehicle.
Needless to say, “up” and “down” are also “up” and “down” in the vertical direction, and “left” and “right” are also “left” and “right” in the horizontal direction.

FIG. 1 is a plan view of a vehicle 102 including a vehicle lamp according to an embodiment of the present invention.
As shown in FIG. 1, a vehicular lamp according to an embodiment of the present invention is a vehicular headlamp (101L, 101R) provided on each of the left and right in front of a vehicle 102. It is described.

  The vehicle lamp of the present embodiment includes a housing (not shown) opened to the front of the vehicle and an outer lens (not shown) attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit 1 (see FIG. 2) and the like are arranged in the lamp room.

2 is a side view of the lamp unit 1, and FIG. 3 is a cross-sectional view of the lamp unit 1 along a lamp unit optical axis (hereinafter, also referred to as a lamp optical axis Z) shown in FIG.
4 is a partially exploded perspective view of the lamp unit 1, and FIG. 5 is an exploded perspective view of a portion of the lamp unit 1 excluding the lens 70 and the lens holder 60.

FIG. 6 is a diagram schematically showing a light distribution pattern projected on the screen. Specifically, a low beam light distribution pattern LP and a high beam light distribution pattern HP (high beam additional light distribution HAP) will be described. FIG.
The VU-VL line in FIG. 6 indicates a vertical reference line on the screen, and the HL-HR line in FIG. 6 indicates a horizontal reference line on the screen.

  As shown in FIGS. 3 and 5, the lamp unit 1 mainly includes a heat sink 10, a cooling fan 20, a first light source L, a reflector 30, a shade 40, a second light source H, and a reflecting member 50. , A lens holder 60, and a lens 70.

(Heat sink 10)
The heat sink 10 is formed of a metal or a resin having a high thermal conductivity in order to efficiently and radiate the heat generated by the first light source L and the second light source H. Is a heat sink 10 made of an aluminum die-cast integrally molded.
However, as in the present embodiment, it is not necessary to be limited to the heat sink 10 of an integrally molded product, and the heat sink 10 may be a part of which is manufactured as a separate part and assembled.

  The heat sink 10 has a first base portion 12 on which the first light source L is disposed, and a front side of the first base portion 12 and a position below the first base portion 12 and inclined forward and obliquely downward. And a second base portion 13 on which the second light source H is disposed.

As shown in FIG. 5, the first base portion 12 is integrally formed on the upper surface and includes a first light source disposing portion 12A on which the first light source L is disposed.
Then, the first light source L arranged in the first light source disposition portion 12A is fixed to the first light source disposition portion 12A by a light source holder 80 fixed to the first base portion 12 with a pair of screws 12N1.

On the other hand, the second base portion 13 is a second light source arranging portion 13A in which the front surface facing the front side receives the second light source H and arranges the second light source H.
A pair of left and right positioning pins 13AA are formed in the second light source disposing portion 13A so as to protrude forward, and a pair of left and right screw fixing holes 13AB are formed at positions slightly above the positioning pins 13AA. Have been.

  As will be described later, the second light source H, the shade 40, and the reflecting member 50 each include a pair of positioning pin insertion holes (positioning pin insertion holes H11, 42A, and positioning pins 13AA) corresponding to the positioning pins 13AA. Insertion hole 52A) and a pair of screw insertion holes (screw insertion hole H12, screw insertion hole 42B, screw insertion hole 52B) corresponding to screw fixing hole 13AB, and as shown in FIG. The light source H, the shade 40, and the reflection member 50 are fixed to the second base portion 13 with the screw 13N1.

Further, as shown in FIG. 3, the heat sink 10 includes a plurality of radiating fins 11 </ b> F provided integrally with the base 11 below the base 11.
Specifically, the radiation fins 11F extend downward from the first base portion 12 and are provided integrally with the first base portion 12 and are arranged in the front-rear direction. A plurality of second radiating fins 13F that extend rearward from the portion 13 and are provided integrally with the second base portion 13 and are arranged in a horizontal direction.

  The first radiating fins 12F have a thin plate shape, and the thin plate-shaped surfaces are formed so as to face in the front-rear direction. The wind sent from the cooling fan 20 between the first radiating fins 12F is horizontal. It flows in the direction.

In recent years, in order to reduce the size of the vehicle lamp, the inner wall surface on the rear side in the lamp room in which the lamp unit 1 is arranged tends to be located near the rear of the lamp unit 1.
In this case, if the flow of the wind is directed to the rear side, the flow of the wind becomes worse due to the influence of the inner wall surface on the rear side in the lamp room located near the rear of the lamp unit 1, and the cooling efficiency may be reduced. However, if the wind is caused to flow in the horizontal direction as in the present embodiment, such a decrease in the cooling efficiency can be avoided.

On the other hand, the second radiating fin 13 </ b> F is in the shape of a thin plate, and is formed so that the surface of the thin plate faces in the left-right direction (horizontal direction). Along the top, it flows.
An opening 11A is formed between the first base portion 12 and the second base portion 13 so as to be horizontally elongated in the vertical direction so as not to obstruct the flow of the wind.

  For this reason, as shown in FIG. 5, it is possible to avoid a decrease in cooling efficiency due to the influence of the pair of lens holder mounting portions 14 for mounting the lens holders 60 provided on the left and right outer sides of the second base portion 13. Can be.

  In addition, the wind takes heat while flowing along the second base portion 13, and the temperature rises. Therefore, by flowing the wind upward rather than in the left-right direction, the flow is further improved. It is possible to increase.

  Further, the wind flows into the reflector 30 through the opening 11A and contributes to the cooling of the space between the first base 12 and the reflector 30, so that the cooling efficiency of the first light source L can be further improved. it can.

  As mentioned earlier, the heat sink 10 includes a pair of lens holder mounting portions 14 provided on the left and right outer sides of the second base portion 13 as shown in FIG. 5, and as shown in FIG. The lens holder mounting portion 14 includes a positioning pin 14A, and a pair of screw fixing holes 14B provided vertically above and below the positioning pin 14A.

  As described later, the lens holder 60 has a positioning pin insertion hole (positioning pin insertion hole 61BA, positioning pin insertion hole 62BA) corresponding to the positioning pin 14A and a screw insertion hole (screw insertion hole) corresponding to the screw fixing hole 14B. The hole 61BB and the screw insertion hole 62BB) are provided, and are fixed to the lens holder mounting portion 14 with a screw 14N1 as shown in FIG.

  As shown in FIG. 2, the heat sink 10 has a cooling fan mounting leg 15 formed with a screw fixing hole that opens downward, and the cooling fan mounting screw 15 is attached to the cooling fan mounting leg 15 with a screw 15N1. Is attached.

(Cooling fan 20)
As shown in FIG. 3, the cooling fan 20 is disposed below the radiation fins 11F of the heat sink 10, and is fixed to the cooling fan mounting leg 15 of the heat sink 10 by the screw 15N1, as described above. .

  Then, by driving the cooling fan 20, the wind is sent between the plurality of radiating fins 11F, the cooling efficiency of the heat sink 10 is increased, and the first light source L and the second light source H can be efficiently cooled. it can.

(First light source L)
The first light source L is a light source that emits light for low beam light distribution, and includes a substrate L1 and one first light emitting chip L2 provided on the substrate L1.
The number of the first light emitting chips L2 does not need to be limited to one, and a plurality of first light emitting chips L2 (for example, four chips) may be provided on the substrate L1.

  The first light source L is disposed on the first base portion 12 so as to emit light upward, and the emitted light is transmitted to the lens 70 by the reflection surface 31 of the reflector 30 facing the first light source L. Is reflected by

  In the present embodiment, the first light source L uses an LED light source in which the first light emitting chip L2 is an LED chip, but a laser light source in which the first light emitting chip L2 is an LD chip (laser diode chip). The first light source L is preferably a semiconductor light source.

(Reflector 30)
As shown in FIG. 5, the reflector 30 is provided on a reflecting portion 30A having a reflecting surface 31 (see FIG. 3) for reflecting light from the first light source L to the lens 70 side, and provided on an outer periphery of a lower end of the reflecting portion 30A. And a flange portion 30B.

  A pair of left and right positioning pins 12B for positioning the reflector 30 and a pair of right and left screw fixing holes 12C for fixing a pair of screws 12N2 for fixing the reflector 30 are provided on the first base portion 12. The flange portion 30B of the reflector 30 includes a pair of left and right pin insertion holes 30BA corresponding to the positioning pins 12B and a pair of left and right screw insertion holes 30BB corresponding to the screw fixing holes 12C.

  For this reason, after arranging the reflector 30 on the first base portion 12 so as to be positioned by the positioning pin 12B, the reflector 30 is fixed to the first base portion 12 by screwing the screw 12N2 into the screw fixing hole 12C. Can be fixed.

  As shown in FIG. 3, the reflector 30 fixed in this manner is in a state in which the front side is opened and the first light source L is covered in a semi-dome shape, and the light from the first light source L is turned forward. Irradiation is performed on the lens 70 side through the opening.

In the present embodiment, a plate member 90 that shields the vicinity of the front side of the first light source L from light is provided, and the plate member 90 is fixed together with the reflector 30 to the first base portion 12.
Further, the reflector 30 has an elliptical surface with the reflection surface 31 having two focal points, and the reflector 30 has a first focal point (a first focal point on the rear side of the reflector 30) of the reflection surface 31 serving as a rear focal point. ) Substantially coincides with the light emission center of the first light emitting chip L2 of the first light source L, and the second focal point BP of the reflection surface 31 (the front focal point of the reflector 30 as well as the second focal point BP of the reflector 30). ) Is disposed on the first base portion 12 so as to be located below the shade 40 in a range overlapping the shade 40 when viewed in the front-rear direction.

(Shade 40)
The shade 40 is disposed between the first light source L and the lens 70 when viewed in the front-rear direction as shown in FIGS. 3 and 4, and the light from the first light source L reflected by the reflector 30 toward the lens 70. Among them, a member for blocking a part of the light traveling downward of the lens 70 and forming a cutoff line CL (see FIG. 6) of the low beam light distribution pattern LP (see FIG. 6).

  For this reason, as shown in FIG. 5, the shade 40 has a shape corresponding to the shape of the cutoff line CL (see FIG. 6), and is located above a second light emitting chip H2 of a second light source H, which will be described later. A light-shielding portion 41 for forming a cut-off line CL (see FIG. 6) is provided.

  Specifically, the cutoff line CL includes an upper horizontal cutoff line CL1 extending horizontally and an upper horizontal cutoff line CL1 extending below a clean horizontal reference line (refer to the line HL-HR). The screen has an oblique cut-off line CL2 extending obliquely downward from an end on the vertical reference line (see line VU-VL) side toward the vertical reference line (see line VU-VL), and a direction away from the oblique cut-off line CL2. A lower horizontal cutoff line CL3 extending in the horizontal direction from an end of the screen of the oblique cutoff line CL2 on the vertical reference line (refer to the VU-VL line) side is provided, and the shade 40 is provided as shown in FIG. Next, the upper horizontal cutoff line CL1, the oblique cutoff line CL2, and the lower horizontal cutoff line CL3 are formed. And it has a light shielding portion 41 of the shape.

  In addition, the shade 40 is provided integrally at each of the left and right ends (that is, both ends) of the light shielding portion 41, and a pair of arms for fixing to the heat sink 10 (more specifically, the second base portion 13). A portion 42 is provided.

  Each of the pair of left and right arms 42 has a positioning pin insertion hole 42A corresponding to the positioning pin 13AA of the second light source placement part 13A of the second base part 13, and a second light source placement part of the second base part 13. A screw insertion hole 42B corresponding to the screw fixing hole 13AB of 13A is formed, and can be fixed to the second base portion 13 with the screw 13N1, as described above.

(Second light source H)
The second light source H is a light source that emits light for high-beam additional light distribution, and is disposed between the first light source L and the lens 70 as viewed in the front-rear direction as shown in FIG.

  As shown in FIG. 5, the second light source H includes a substrate H1 and a plurality of second light-emitting chips H2 provided on the substrate H1 and arranged in a horizontal direction. 6), a high-beam additional light distribution HAP (see FIG. 6) formed by light from the second light source H is added above the low-beam light distribution pattern LP (see FIG. 6). , A high beam light distribution pattern HP (see FIG. 6) is formed.

  Therefore, by turning on or off part or all of the second light emitting chip H2, the high beam light distribution pattern HP (more specifically, the high beam additional light distribution (Variable state) can be controlled.

  In the present embodiment, the second light source H is also an LED light source using an LED chip for the second light emitting chip H2, like the first light source L.

  However, as described for the first light source L, the second light emitting chip H2 may be a laser light source such as an LD chip (laser diode chip), and the second light source H is preferably a semiconductor light source. Used for

  The board H1 has a pair of left and right positioning pin insertion holes H11 corresponding to the positioning pins 13AA of the second light source placement section 13A of the second base section 13, and screws of the second light source placement section 13A of the second base section 13. A pair of left and right screw insertion holes H12 corresponding to the fixing holes 13AB are formed, and can be fixed to the second base portion 13 with the screws 13N1, as described above.

(Reflective member 50)
The reflecting member 50 is a member that is disposed below the second light emitting chip H2 and reflects a part of the light from the second light emitting chip H2 toward the upper side of the lens 70. There is provided a reflecting portion 51 that reflects light from the light emitting chip H2) toward the lens 70, and a fixing portion 52 provided integrally on the left and right sides of the reflecting portion 51 and fixed to the second base portion 13. .

  Then, the light incident on the lower side of the lens 70 is reflected to the upper side of the lens 70 by the reflection unit 51, so that the high beam additional light distribution HAP formed by the light from the second light source H (second light emitting chip H2) is formed. The light distribution has a spread upward.

  Also, each of the pair of left and right fixing parts 52 has a positioning pin insertion hole 52A corresponding to the positioning pin 13AA of the second light source placement part 13A of the second base part 13, and a second light source placement part of the second base part 13. A screw insertion hole 52B corresponding to the screw fixing hole 13AB of 13A is formed, and can be fixed to the second base portion 13 with the screw 13N1 as described above.

(Lens holder 60)
As shown in FIGS. 3 and 4, the lens holder 60 includes a first holder 61 that receives a rear side of a lens 70 (more specifically, a flange portion 72) described later, and a lens 70 (more specifically, a flange portion 72). And a second holder 62 for pressing the lens 70 (more specifically, the flange portion 72) from the front side toward the first holder 61 side.

  When the first holder 61 is attached to the heat sink 10, the peripheral portion of the opening corresponding to the incident surface 71 </ b> A of the lens 70 where the light is incident is a receiving portion 61 </ b> AA that receives the rear side of the flange portion 72 of the lens 70. A first holder main body 61A formed so that the lens 70 is located at a predetermined position on the front side, and a pair of lens holder mounting portions of the heat sink 10 provided integrally on the rear side of the first holder main body 61A. And a pair of left and right first mounting portions 61B for fixing to the mounting portion 14.

  The receiving portion 61AA is provided with a pair of left and right positioning projections 61AB that engage with the pair of left and right positioning concave portions 72A of the lens 70.

  On the other hand, the second holder 62 includes a pressing portion 62AA in which a peripheral portion of an opening corresponding to the emission surface 71B of the lens 70 from which light is emitted presses the flange portion 72 of the lens 70 toward the receiving portion 61AA of the first holder 61. The second holder body 62A is provided on the first holder body 61A of the first holder 61, and a pair of left and right second mounting parts 62B for fixing the heat sink 10 to the pair of lens holder mounting parts 14. , Is provided.

  The first mounting portion 61B of the pair of left and right first holders 61 and the second mounting portion 62B of the pair of left and right second holders 62 correspond to the positioning pins 14A of the lens holder mounting portion 14 of the heat sink 10. The positioning pin insertion holes (positioning pin insertion hole 61BA, positioning pin insertion hole 62BA) to be formed and the heat sink 10 provided in a pair above and below the positioning pin insertion holes (positioning pin insertion hole 61BA, positioning pin insertion hole 62BA). And a screw insertion hole (a screw insertion hole 61BB, a screw insertion hole 62BB) corresponding to the screw fixing hole 14B of the lens holder mounting portion 14.

  Therefore, the lens holder 60 is attached to the lens holder attaching portion 14 of the heat sink 10 with the screw 14N1 so that the first holder 61 and the second holder 62 sandwich the flange portion 72 of the lens 70. I have.

(Lens 70)
As shown in FIGS. 3 and 4, the lens 70 is disposed in front of the first light source L when viewed in the front-rear direction, and includes a lens unit 71 that performs light distribution control, and an outer peripheral portion of the lens unit 71. As described above, it includes the flange portion 72 which is provided integrally and held by the lens holder 60 (the receiving portion 61AA of the first holder 61 and the pressing portion 62AA of the second holder 62).

  Further, the flange portion 72 is provided with a pair of left and right outwardly opened notched positioning recesses 72A that receive a pair of left and right positioning protrusions 61AB provided on the receiving portion 61AA of the first holder 61.

  The lens 70 (more specifically, the lens unit 71) includes an incident surface 71A on which light enters, and an exit surface 71B for irradiating the incident light to the front side. Light from the first light source L and the second light source H is incident, and the incident light is emitted forward from the emission surface 71B from which the light is emitted.

  Here, as shown in FIG. 3, the second light source arrangement portion 13A of the second base portion 13 is directed obliquely upward and forward, and the second light source H is thereby also directed obliquely upward and forward. Has become.

  Then, by setting the inclination of the front diagonally upward to be appropriate, the high-beam additional light distribution HAP formed by the light from the second light source H (the second light emitting chip H2) becomes the first light source L (the first light source L). The light is hardly separated from the low beam light distribution pattern LP formed by the light from the light emitting chip L2).

  For this reason, the lens 70 mainly corrects the entire curvature of the entire exit surface 71B below the lens optical axis O of the lens 70 (more specifically, the lens portion 71) by slightly correcting the curvature. If the low-beam light distribution pattern LP (see FIG. 6) formed by light is positioned slightly above (for example, about several degrees of comma), the low-beam light distribution pattern LP (see FIG. 6) and the high-beam additional light distribution are provided. And HAP (see FIG. 6).

  Therefore, in the present embodiment, since only a slight modification of the exit surface 71B of the lens 70 is required, it is possible to suppress the appearance of distortion on the exit surface 71B of the lens 70.

  Further, in the present embodiment, as shown in FIG. 3, in order to suppress the appearance of a bright streak having a high luminous intensity between the low beam light distribution pattern LP and the high beam light distribution pattern HP (high beam additional light distribution HAP), The rear focal point P of the lens 70 (more specifically, the lens unit 71) is located forward of the second focal point BP, which is the focal point on the front side of the reflector 30.

  Then, with the rear focal point P of the lens 70 (more specifically, the lens unit 71) positioned forward of the second focal point BP, which is the focal point on the front side of the reflector 30, the cutoff line CL (FIG. 6) 3) moves upward in the vertical direction, and rotates the lens optical axis O of the lens 70 downward with the rear focal point P of the lens 70 (the lens unit 71) as the rotation axis, as shown in FIG. Then, assuming that the lens optical axis O has an inclination with the rear focal point P as the rotation axis, the lens optical axis O is inclined forward and obliquely downward with respect to the lamp optical axis Z. The cutoff line CL is shifted downward as a whole so that the cutoff line CL appears at an appropriate position on the screen.

  Specifically, the rear focal point P of the lens 70 (more specifically, the lens unit 71) is set to the focal point on the front side of the reflector 30 by setting the flange portion 72 of the lens 70 to be held by the lens holder 60. It is located about 0.7 mm forward of a certain second focal point BP, and the lens optical axis O is inclined forward and obliquely downward by about 0.4 degrees with respect to the lamp optical axis Z.

  However, there is no need to be limited to the setting of the flange portion 72. For example, the rear focus P of the lens 70 (more specifically, the lens portion 71) is the front focus of the reflector 30 by setting the lens holder 60. The lens optical axis O may be inclined forward and downward about 0.4 degrees with respect to the lamp optical axis Z while being positioned about 0.7 mm forward of the second focal point BP.

  On the other hand, in the present embodiment, a light diffusing portion that can appropriately blur the cutoff line CL is provided on the incident surface 71A of the lens 70 (lens portion 71), and will be described in detail below.

FIG. 7 is a diagram illustrating an incident surface 71A of the lens 70 (the lens unit 71).
As shown in FIG. 7, the incident surface 71A is irradiated within a predetermined range in the horizontal direction from a vertical reference line (VU-VL line in FIG. 6) on the screen when viewed in the horizontal direction (right and left direction in the figure). It has a central region ZN1 on which light is incident, and an outer region ZN2 on the outside in the horizontal direction that is continuous with the central region ZN1.
In the present embodiment, the diameter of the incident surface 71A is about 65 mm.

  Specifically, in the present embodiment, a predetermined range in the horizontal direction from the vertical reference line on the screen (VU-VL line in FIG. 6) is set horizontally from the vertical reference line on the screen (VU-VL line in FIG. 6). Since the range RN is within 10 degrees in the direction (see FIG. 6), the center side area ZN1 irradiates the range RN within 10 degrees in the horizontal direction from the vertical reference line (VU-VL line in FIG. 6) on the screen. This is the area where the light to be incident is incident.

  Then, the incident surface 71A is provided with the first light diffusion portion OPD1 provided in the center side region ZN1 and the second light provided in the center side region ZN1 and continuous below the first light diffusion portion OPD1. And a diffusion unit OPD2.

  In the present embodiment, the first light diffusing unit OPD1 is provided up to the vertically upper end of the incident surface 71A, and the second light diffusing unit OPD2 is provided up to the vertically lower end of the incident surface 71A. Have been.

However, the first light diffusing unit OPD1 is not necessarily limited to being provided up to the vertically upper end of the incident surface 71A, but is provided slightly above the range in which light from the first light source L is incident. Just do it.
For example, the upper end of the first light diffusion unit OPD1 may be provided above the lens optical axis O in a range of 3 mm or more and 15 mm or less.

  However, in the present embodiment, since the lens 70 is also used for controlling the light distribution of the light from the second light source H that forms the high-beam additional light distribution HAP, the first light diffusing unit OPD1 is connected to the incident surface 71A. It is designed to be provided up to the upper end in the vertical direction.

  Since the light from the second light source H does not necessarily reach the upper end of the incident surface 71A in the vertical direction, the light from the second light source H is also not less than 3 mm and 10 mm based on the position of the upper surface in the vertical direction of the incident surface 71A. The upper end of the first light diffusing unit OPD1 may be located at a position within the following range.

  Then, in the first light diffusion unit OPD1 and the second light diffusion unit OPD2, the boundary BL between the first light diffusion unit OPD1 and the second light diffusion unit OPD2 is irradiated onto the cutoff line CL of the incident surface 71A. In the present embodiment, the boundary BL between the first light diffusing unit OPD1 and the second light diffusing unit OPD2 is formed so as to be positioned within a first range W in the vertical direction for allowing the incident light to enter. The first range W is provided at a substantially middle position in the vertical direction.

  Specifically, as shown in FIG. 6, a part of the upper horizontal cut-off line CL1 of the cut-off line CL is within a range of 10 degrees left and right from a vertical reference line (VU-VL line in FIG. 6) on the screen. , An oblique cut-off line CL2 and a part of the lower horizontal cut-off line CL3, and the incident surface 71A corresponding to the width between the upper horizontal cut-off line CL1 and the lower horizontal cut-off line CL3 when viewed in the vertical direction. The portion is in the first range W.

  However, the first range W is slightly larger than the width corresponding to the width between the upper horizontal cut-off line CL1 and the lower horizontal cut-off line CL3 as viewed in the vertical direction in consideration of a positional shift or the like when the lens 70 is mounted. The width is set to be relatively large (for example, a width that is approximately 5 mm wider than the corresponding width).

  Needless to say, the width corresponding to the width as viewed in the vertical direction between the upper horizontal cutoff line CL1 and the lower horizontal cutoff line CL3 is the actual size on the screen, the upper horizontal cutoff line CL1 and the lower horizontal cutoff line CL1. It does not mean the same width as the width seen in the vertical direction between CL3, but is the width in a state before being irradiated to the front side via the lens 70.

  In the present embodiment, as described above, the curvature of the entire exit surface 71B of the lens 70 (more specifically, the lens unit 71) below the optical axis O of the lens 70 is slightly corrected to be the first curvature. Since the low-beam light distribution pattern LP formed by the light from the light source L is positioned slightly above (for example, about several degrees of a comma), the first range W (more precisely, the first range W (Upper end) is located 5 mm or more below the lens optical axis O of the lens 70 in the vertical direction.

  In the present embodiment, the first light diffusing unit OPD1 and the second light diffusing unit OPD2 are both formed so as to protrude from the incident surface 71A, and include a plurality of rhombic prisms provided so as to be continuous without gaps. The second light diffusion unit OPD2 has a larger light diffusion width than the first light diffusion unit OPD1 due to the projection height of the rhombic prism.

  The rhombic prisms provided in the first light diffusing unit OPD1 and the second light diffusing unit OPD2 have the same outer shape when viewed from the rhombic shape of the rhombic prism when the incident surface 71A is viewed from the front. Only the protruding height is different.

  Specifically, in the present embodiment, the projection height of the rhombic prism of the first light diffusion unit OPD1 is about 7 to 8 μm, and the projection height of the rhombic prism of the second light diffusion unit OPD2 is about 10 μm. Thus, the light diffusion width of the second light diffusion unit OPD2 is larger than that of the first light diffusion unit OPD1.

  FIG. 8 is a diagram for explaining how the cutoff line CL is blurred by the first light diffusion unit OPD1 and the second light diffusion unit OPD2.

The cut-off line CL indicated by the solid line in FIG. 8 is the original cut-off line CL.
Then, the light incident near the first range W shown in FIG. 7 is originally radiated below the cutoff line CL shown in FIG. 8, but the first light diffusing unit OPD1 Since the second light diffusing portion OPD2 is provided, the light is diffused when the light is incident from the incident surface 71A, so that the light is also irradiated above the cutoff line CL.

  Specifically, the light diffused by the first light diffusion unit OPD1 in which the projection height of the rhombic prism is low and the light diffusion width is small is emitted from the lens 70 so as to spread to the dotted line SLM shown in FIG. Is done.

  On the other hand, the light diffused by the second light diffusion unit OPD2 in which the rhombic prism has a high protrusion height and a large light diffusion width is emitted from the lens 70 so as to spread to the dashed line SL shown in FIG. .

  Therefore, the range from the cutoff line CL to the dotted line SLM shown in FIG. 8 is an area where the light diffused by the first light diffusion unit OPD1 and the light diffused by the second light diffusion unit OPD2 are multiplexed. On the other hand, the range from the dotted line SLM shown in FIG. 8 to the dashed line SL shown in FIG. 8 is a region formed only by the light diffused by the second light diffusion unit OPD2, Since it is possible to realize a luminous intensity distribution in which the luminous intensity gradually decreases as the distance from the CL increases upward in the vertical direction, a low-beam light distribution pattern LP with good visibility can be obtained.

  In addition, since the light diffusion width changes depending on the projection height of the rhombic prism, it is possible to set an appropriate required light diffusion width, and it is possible to design the cutoff line CL so as not to be excessively blurred.

  On the other hand, in order not to give a sense of non-uniform blurring of the light distribution patterns (the low beam light distribution pattern LP and the high beam light distribution pattern HP), the incident surface 71A is, for example, at least the first surface of the outer region ZN2 (see FIG. 7). It is preferable to include a third light diffusion unit OPD3 provided in a region where the light of the light source L and the light of the second light source H is incident. In the present embodiment, the incident surface 71A is provided in the entire outer region ZN2 of the incident surface 71A. And a third light diffusion unit OPD3.

  Specifically, the third light diffusing portion OPD3 is also formed so as to protrude from the incident surface 71A, includes a plurality of rhombic prisms provided so as to be continuous without any gap, and has a rhombic shape when the incident surface 71A is viewed from the front. When viewed from the rhombic outer shape of the prism, it has the same outer shape as the rhombic prisms of the first light diffusing unit OPD1 and the second light diffusing unit OPD2.

  On the other hand, since the third light diffusing unit OPD3 does not need to largely diffuse light, the protruding height of the rhombic prism of the third light diffusing unit OPD3 is equal to the protruding height of the rhombic prism of the first light diffusing unit OPD1. (Approximately 7 to 8 μm), and the light diffusion width of the third light diffusion unit OPD3 is substantially the same as the light diffusion width of the first light diffusion unit OPD1.

  In this way, by providing the light diffusion portion also in the outer region ZN2, light is partially diffused, resulting in a light distribution pattern (a low beam light distribution pattern LP, a high beam light distribution pattern HP) with a sense of incongruity. Can be suppressed.

  As described above, the present invention has been described based on the specific embodiments. However, the present invention is not limited to the above embodiments, and has been changed and improved without departing from the technical idea. This is also included in the technical scope of the invention, and it will be apparent to those skilled in the art from the description of the claims.

DESCRIPTION OF SYMBOLS 1 Lamp unit 10 Heat sink 11 Base part 11A Opening 11F Radiation fin 12 First base part 12A First light source placement part 12B Positioning pin 12C Screw fixing hole 12F First radiation fins 12N1, 12N2 Screw 13 Second base part 13A Second light source Arrangement part 13AA Positioning pin 13AB Screw fixing hole 13F Second radiating fin 13N1 Screw 14 Lens holder mounting part 14A Positioning pin 14B Screw fixing hole 14N1 Screw 15 Cooling fan mounting leg 15N1 Screw 20 Cooling fan 30 Reflector 30A Reflector 30B Flange 30BA Pin insertion hole 30BB Screw insertion hole 31 Reflection surface 40 Shade 41 Light shielding part 42 Arm part 42A Positioning pin insertion hole 42B Screw insertion hole 50 Reflection member 51 Reflection part 52 Fixed part 52A Positioning pin insertion hole 52B Screw insertion hole 6 0 lens holder 61 first holder 61A first holder main body 61AA receiving part 61AB positioning protrusion 61B first mounting part 61BA positioning pin insertion hole 61BB screw insertion hole 62 second holder 62A second holder main body 62AA pressing part 62B second mounting Part 62BA Positioning pin insertion hole 62BB Screw insertion hole 70 Lens 71 Lens part 71A Incident surface 71B Emission surface 72 Flange part 72A Positioning recess 80 Light source holder 90 Plate member BL Boundary BP Second focal point CL Cutoff line CL1 Upper horizontal cutoff line CL2 Oblique cut Offline CL3 Lower horizontal cutoff line H Second light source H1 Substrate H11 Positioning pin insertion hole H12 Screw insertion hole H2 Second light emitting chip HAP High beam additional light distribution HP High beam light distribution pattern L First light source L1 Substrate L2 First light emitting chip LP Low beam light distribution pattern O Lens optical axis OPD1 First light diffusing unit OPD2 Second light diffusing unit OPD3 Third light diffusing unit P Rear focal point RN Range W within 10 degrees W First range Z Lamp optical axis ZN1 Central side Area ZN2 Outside areas 101L, 101R Headlight 102 for vehicle Vehicle

Claims (7)

A vehicle lamp,
The vehicle lamp,
A first light source that emits light for low beam light distribution,
A lens disposed in front of the first light source;
A shade disposed between the first light source and the lens to form a cut-off line of a low beam light distribution pattern;
A reflector that reflects light from the first light source toward the lens,
The lens is
An incident surface on which light is incident,
An emission surface for irradiating the incident light to the front side,
The incident surface is
A first light diffusing unit provided in a central region where light irradiated in a predetermined range in the horizontal direction from a vertical reference line on the screen is incident;
A second light diffusing unit provided in the central region and connected to a lower side of the first light diffusing unit;
A boundary between the first light diffusing unit and the second light diffusing unit is located within a first range in a vertical direction for allowing light to be irradiated on a cutoff line of the incident surface,
The vehicle light according to claim 1, wherein the second light diffusion portion has a larger light diffusion width than the first light diffusion portion.   The vehicular lamp according to claim 1, wherein a boundary between the first light diffusing unit and the second light diffusing unit is provided at a substantially middle position in the vertical direction of the first range. The vehicle lighting device includes a second light source that is disposed between the first light source and the lens, and that emits light for high beam additional light distribution,
The incident surface includes a third light diffuser provided at least in a region where light from the first light source and the second light source is incident on an outer region in a horizontal outside connected to the central region,
The vehicle lamp according to claim 1, wherein the third light diffusion unit has a light diffusion width equal to the light diffusion width of the first light diffusion unit. The first light diffusion unit is provided up to a vertically upper end of the incident surface,
The second light diffusing unit is provided up to a vertically lower end of the incident surface,
4. The vehicular lamp according to claim 3, wherein the third light diffuser is provided on the entire outer region of the incident surface. 5. The light diffusing portion is formed so as to protrude from the incident surface, and includes a rhombic prism provided so as to be continuous without a gap,
5. The vehicular lamp according to claim 1, wherein the diffusion width of the light is set by a projection height of the rhombic prism. 6.   The said center side area | region is the area | region where the light irradiated in the range within 10 degrees in the horizontal direction from the vertical reference line on the said screen is incident, The Claim 1 characterized by the above-mentioned. 4. The vehicle lighting device according to claim 1.   The boundary between the first light diffusing unit and the second light diffusing unit is located at least 5 mm below the lens optical axis of the lens in the vertical direction, and is defined by any one of claims 1 to 6. The vehicle lighting device according to claim 1.

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