JP6582524B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp.

  When light from a semiconductor light-emitting element is incident on the incident surface of the projection lens, it is diffused in the vertical direction by the vertical diffusion unit, and the cut-off line of the light distribution pattern is diffused in the vertical direction to visually recognize the driver. In the vehicular lamp having improved performance, light streaks (light streaks) may occur on the road surface.

  Therefore, in order to solve this problem, Patent Document 1 includes a light source and a lens that irradiates the light from the light source to the outside as a light distribution pattern having a cut-off line. There is disclosed a vehicular lamp in which a diffusing portion for diffusing light is provided, and the diffusing portion is provided by intersecting continuous micro concave curved surfaces or micro convex curved surfaces (see Patent Document 1).

  In the vehicular lamp disclosed in Patent Document 1, a diffusing portion is densely provided without any gap on the entire incident surface of the lens (all surfaces that contribute to the formation of the light distribution pattern).

JP 2014-157733 A

  By the way, it is possible to improve the visibility for the driver because the upper area can be suppressed from suddenly darkening by making the cut-off line tricky, but the cut-off line is also difficult to see. Therefore, the workability when adjusting the vehicular lamp by aiming or the like is lowered.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicular lamp that takes into consideration workability during adjustment by aiming or the like.

The present invention is grasped by the following composition in order to achieve the above-mentioned object.
(1) The vehicular lamp according to the present invention is a vehicular lamp that forms a light distribution having a cut-off line that includes a light source and a lens disposed in front of the light source, and the lens is incident with light. An upper incident surface above the center of the incident surface, an intermediate incident surface including the center, and a lower incident surface below the intermediate incident surface, the upper incident surface, the intermediate incident surface, In addition, a light diffusing portion is formed on the lower incident surface so as to be substantially uniformly arranged, and the light diffusing portion formed on the intermediate incident surface has the upper incident surface and the lower incident surface. The arrangement density is lower than that of the light diffusion portion formed on the surface.
(2) In the configuration of (1), the light diffusion portion formed on the upper incident surface is formed so that the light diffusion amount is minimized.
(3) In the configuration of (1) or (2), the intermediate incident surface is formed such that the center is positioned approximately in the middle of the vertical width of the intermediate incident surface, and the intermediate incident surface is The vertical width is set to be 20% to 45% of the vertical width of the entire incident surface of the lens.
(4) In any one of the constitutions (1) to (3), the light diffusion portion formed on the intermediate incident surface has substantially the same end on the side close to the light diffusion portion adjacent in the horizontal direction. It is formed so as to be located on a vertical line, and the intermediate incident surface is formed with a flat portion not provided with the light diffusion portion extending obliquely so that the light diffusion portions are separated from each other.
(5) In any one of the configurations (1) to (4), the reflector is provided so as to cover the light source in a semi-dome shape, and reflects light from the light source toward the lens, and the reflector. A shade that is arranged between the lens and shields part of the light reflected by the reflector.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp considering the workability | operativity at the time of adjustment by aiming etc. can be provided.

It is a top view of vehicles provided with a vehicular lamp of an embodiment concerning the present invention. It is sectional drawing along the light irradiation optical axis of the lamp unit of embodiment which concerns on this invention. It is the perspective view shown so that the entrance plane side of the lens of embodiment which concerns on this invention could be seen. It is a figure which shows the light distribution pattern on the screen of the vehicle lamp of embodiment which concerns on this invention, (a) is a figure which shows the light distribution pattern by the light which injected into the upper side entrance plane of a lens, (b) (A) is a figure which shows the light distribution pattern by the light which injected into the intermediate | middle incident surface of a lens, (c) is a figure which shows the light distribution pattern by the light which injected into the lower side entrance surface of a lens, (d) is (a) It is a figure which shows the low beam light distribution pattern as a vehicle lamp with which the light distribution pattern of (c) was multiplexed. It is a figure for demonstrating the light distribution pattern on the screen formed with the light which injected into the intermediate entrance surface of the lens of embodiment which concerns on this invention, (a) of the light-diffusion part formed in an intermediate entrance surface It is a figure for the comparison which made arrangement density 100%, (b) is a figure of embodiment which made the arrangement density of the light-diffusion part 50%.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment. In the embodiments and drawings, “front” and “rear” indicate “forward direction” and “reverse direction” of the vehicle, respectively, and “up”, “down”, “left” unless otherwise specified. "And" Right "respectively indicate directions viewed from the driver who gets on the vehicle.

  The vehicle lamp according to the embodiment of the present invention is a vehicle lamp mounted on each of the left and right automobile headlamps (101R, 101L) in front of the vehicle 102 shown in FIG. A vehicular lamp will be described.

  The vehicular lamp according to the present embodiment includes a housing (not shown) that opens to the front side of the vehicle and an outer lens (not shown) that is attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit (see FIG. 2) and the like are disposed in the lamp chamber.

FIG. 2 is a cross-sectional view of the lamp unit 10 along the light irradiation optical axis.
As shown in FIG. 2, the lamp unit 10 includes a heat sink 20, a light source 30 disposed on the heat sink 20, a reflector 40 disposed on the heat sink 20 so as to cover the light source 30 in a semi-dome shape, and a light source 30. The lens 50 arrange | positioned in the front side of this, and the shade 60 arrange | positioned between the reflector 40 and the lens 50 is provided.

(heatsink)
The heat sink 20 is a member that dissipates heat generated by the light source 30 and is preferably formed using a metal material (for example, aluminum) or a resin material having high thermal conductivity. 20 is made of aluminum die casting.

(light source)
As the light source 30, a semiconductor type light source can be suitably used. In the present embodiment, an LED which is a semiconductor type light source in which a light emitting chip 32 is provided on a substrate 31 on which electric wiring for power supply (not shown) is formed is used. ing.
The number of light emitting chips 32 provided on the substrate 31 is not particularly limited, and may be one or plural.

Further, the shape of the light emitting chip 32 is not particularly limited, and may be square or rectangular.
Furthermore, in this embodiment, although the example using LED is shown, you may make it use semiconductor type light sources, such as LD and EL (organic EL).

  As shown in FIG. 2, in the present embodiment, the substrate 31 is disposed on the heat sink 20 so that the light emitting surface of the light emitting chip 32 faces upward, and the light from the light source 30 is irradiated upward. ing.

(Reflector)
The reflector 40 is disposed on the heat sink 20 so as to cover the light source 30 in a semi-dome shape, and the light from the light source 30 is reflected to the lens 50 side by the reflecting surface 41 of the reflector 40.
The material used for the reflector 40 is preferably a metal material (for example, aluminum) or a resin material having a high thermal conductivity and a light-impermeable material. For example, similar to the heat sink 20, it is made of aluminum die casting. Can be.

The reflection surface 41 of the reflector 40 is a free-form surface based on a spheroid (ellipse) and has two focal points.
The reflector 40 is disposed on the heat sink 20 so that the first focal point F1 of the reflecting surface 41 is located near the light emission center of the light source 30 or near the light emission center, and the second focal point F2 is located near the upper end of the shade 60. Has been.

(lens)
The lens 50 can be formed using, for example, a transparent resin material such as polycarbonate or acrylic.
In this embodiment, the lens 50 has a circular shape when viewed from the light irradiation direction, and as shown in FIG. 2, the incident surface 51 on which light is incident is planar, and the emission surface from which light is emitted is forward. Although an aspherical lens having a circular arc shape protruding to the side is used, for example, the surface shapes of the incident surface 51 and the exit surface 52 may be formed in other shapes such as a free-form surface.

  Note that the incident surface 51 of the lens 50 of the present embodiment looks planar as described above when viewed as an appearance, but since the light diffusing portion (prism) is formed on the incident surface 51, it is accurate. Is not a perfect plane because many fine protrusions are formed. This light diffusion part will be described in detail later.

  Further, the lens 50 is provided with a flange 53 on the incident surface 51 side. For example, the lens 53 is held by a lens holder (not shown) attached to the heat sink 20, and the rear focus of the lens 50 is the reflector 40. The second focal point F2 or the vicinity of the second focal point F2 is disposed.

(shade)
The shade 60 can be suitably formed using a light-impermeable material, and the upper end of the shade 60 is positioned in the vicinity of the second focus F of the reflector 40 and the rear focus of the lens 50 as shown in FIG. As shown in FIG.

  Then, a part of the light reflected by the reflecting surface 41 of the reflector 40 and traveling toward the lens 50 is shielded to form a cut-off line of the low beam light distribution pattern.

Next, the light diffusion portion formed on the incident surface 51 of the lens 50 will be described with reference to FIG.
FIG. 3 is a perspective view in which the incident surface 51 side of the lens 50 is visible.
As shown in FIG. 3, the lens 50 includes an upper incident surface 54 above the center of the incident surface 51 on which light is incident, an intermediate incident surface 55 including the center of the incident surface 51, and a lower side than the intermediate incident surface 55. And a lower incident surface 56.

A large number of light diffusion portions 57a, 57b, and 57c are formed on the upper incident surface 54, the intermediate incident surface 55, and the lower incident surface 56, respectively, so as to be arranged substantially uniformly.
Even if the mounting position of the lens 50 is slightly shifted due to mounting errors during assembly and the like, the light incident on the upper incident surface 54, the intermediate incident surface 55, and the lower incident surface 56 is arranged almost uniformly. The light diffusion state by the light diffusion portions 57a, 57b, and 57c does not change, and a stable light diffusion state can be obtained.

In the present embodiment, the light diffusing portions 57a, 57b, and 57c all have the same shape.
Hereinafter, when these light diffusion portions 57a, 57b, and 57c are collectively referred to, they are simply referred to as the light diffusion portion 57.

  Specifically, each of the light diffusing sections 57 is a prism having a rhombic square pyramid with a bottom surface having a rhombus shape and a protruding height of 20 μm protruding in a direction away from the incident surface 51 (on the light source 30 side).

  As shown in FIG. 3, each of the light diffusing portions 57 is formed on the incident surface 51 so that the two diagonal lines of the bottom rhombus are along the horizontal direction (horizontal direction) and the vertical direction (vertical direction). .

  As can be seen from FIG. 3, the light diffusing portion 57a of the upper incident surface 54 and the light diffusing portion 57c of the lower incident surface 56 are densely provided over the entire incident surface.

  On the other hand, the light diffusing portions 57b of the intermediate incident surface 55 are arranged almost uniformly on the intermediate incident surface 55, but are not provided with no gaps on the entire incident surface, and the light diffusing portions 57b are separated from each other. Thus, the light diffusion portion 57b is arranged.

More specifically, the adjacent ends of the light diffusion portions 57ba and 57bb adjacent in the horizontal direction are formed so as to be located on substantially the same vertical line (see the dotted line L1), and the light diffusion portions 57b are separated from each other. As described above, the flat surface portion 58 that does not include the light diffusion portion 57b extending obliquely is formed.
As described above, the incident surface 51 may be formed as a free-form surface, and in this case, the flat portion 58 naturally has a shape change according to the surface shape of the incident surface 51. Needless to say, therefore, the flat portion 58 is not a flat portion having no change in surface shape, but merely a portion in which no light diffusion portion is provided.

  In the present embodiment, when attention is paid to one light diffusing portion 57b, when four identical rhombuses are drawn so as to be in contact with the four sides of the rhombus on the bottom surface of the light diffusing portion 57b, the four rhombus portions become planes. At the same time, when the four rhombuses are drawn so as to contact the upper, lower, left and right edges of the rhombus on the bottom surface of the one light diffusion portion 57b of interest, the four rhombus portions are also made flat. Thus, a flat portion 58 that is connected and extends obliquely is formed.

  In other words, the flat surface portion 58 is thinned every other light diffusion portion 57b in the vertical and horizontal directions and in an oblique direction with reference to a state where the light diffusion portion 57b is densely provided on the entire intermediate incident surface 55 without a gap. In this way, it is configured to be a plane.

  For this reason, from the viewpoint of the arrangement state of the light diffusing portions 57b, half of the arrangement of the light diffusing portions 57b densely on the entire intermediate incident surface 55 (arrangement density 100%), that is, the arrangement The light diffusing portion 57b is formed on the intermediate incident surface 55 so that the density is 50%, and the light diffusing portions 57b are distributed almost uniformly with respect to the entire intermediate incident surface 55. In this way, the intermediate incident surface 55 is formed.

  With the intermediate incident surface 55 as described above, the light that enters the lens 50 from the flat portion 58 is not diffused, whereas the light that enters the lens 50 from the light diffusion portion 57b is diffused by the light diffusion portion 57b. Therefore, the amount of light distribution pattern formed by the light incident on the intermediate incident surface 55 is less than that in the case where the light diffusion portion 57b is provided on the entire intermediate incident surface 55. can do.

  On the other hand, on the upper incident surface 54 and the lower incident surface 56, the light diffusion portions 57a and the light diffusion portions 57c are densely formed with no gap so that the arrangement density becomes 100%.

  Therefore, in the present embodiment, the light distribution pattern formed by the light incident on the intermediate incident surface 55 in which the arrangement density of the light diffusing portions 57 b is set lower than the upper incident surface 54 and the lower incident surface 56. Only the part of is a little tricky.

  FIG. 4 is a diagram showing a light distribution pattern on the screen, FIG. 4A is a diagram showing a light distribution pattern P1 by light incident on the upper incident surface 54, and FIG. 4B is an intermediate incident. FIG. 4C is a diagram showing a light distribution pattern P3 by light incident on the lower incident surface 56, and FIG. 4D is a diagram showing a light distribution pattern P3 by light incident on the surface 55. FIG. It is a figure which shows the low beam light distribution pattern LP with which the light patterns P1, P2, and P3 were multiplexed.

As can be seen from FIG. 4, the light incident on the upper incident surface 54 (see FIG. 4A) and the lower incident surface 56 (see FIG. 4C) is a diffused light distribution pattern of the low beam light distribution pattern. The light incident on the intermediate incident surface 55 (see FIG. 4B) is a condensed light distribution of a low beam light distribution pattern including the upper cutoff line CL1, the oblique cutoff line CL2, and the lower cutoff line CL3. A pattern is formed.
Hereinafter, the upper cut-off line CL1, the oblique cut-off line CL2, and the lower cut-off line CL3 may be collectively referred to as a cut-off line CL in some cases.

  As described above, the light diffusion portion 57b of the intermediate incident surface 55 has a low arrangement density, so that the amount of light distribution pattern formed by the light incident on the intermediate incident surface 55 is reduced. Therefore, as will be described below with reference to FIG. 5, it is easy to visually recognize the cut-off line CL.

  FIG. 5 is an enlarged view of a part of the cut-off line CL of the light distribution pattern on the screen formed by the light incident on the intermediate incident surface 55. FIG. 5 (a) is for comparison. In the figure, when the arrangement density of the light diffusion portions 57b on the intermediate incident surface 55 is 100%, that is, the light diffusion portions 57b on the intermediate incident surface 55 have no gap as with the upper incident surface 54 and the lower incident surface 56. FIG. 5B is a diagram when the arrangement density is 50% according to the present embodiment.

  5A and 5B, since the light diffusion portion 57b is formed on the intermediate incident surface 55, the arrangement density of the light diffusion portion 57b is 100% (FIG. 5A). And the arrangement density is 50% (see FIG. 5B), the light diffusion unit 57b diffuses the upper cutoff line CL1, the oblique cutoff line CL2, and the lower cutoff line CL3. The light distribution is spread to the range indicated by the alternate long and short dash line SL.

For this reason, the sudden darkening at the cut-off line CL is alleviated, and the visibility is good for the driver.
On the other hand, if the arrangement density of the light diffusing portions 57b is lowered to 50% and the amount of light distribution pattern is reduced, the amount of cutoff of the cut-off line CL is also reduced, as shown in FIG. 5B. The cut-off line CL becomes clearer than in the case of FIG.

  For this reason, since the cut-off line CL becomes easy to visually recognize, workability at the time of adjustment by aiming or the like can be improved.

  In the present embodiment, the upper incident surface 54, the intermediate incident surface 55, and the lower incident surface 56 shown in FIG. 3 each have a vertical width that is 1/3 of the vertical width of the incident surface 51. However, it is not always necessary to make the width uniform, and the intermediate incident surface 55 that lowers the arrangement density of the light diffusion portions 57b is incident on the light that mainly forms the cut-off line CL. It suffices if it has a width that covers the portion of the incident surface that does.

  Therefore, the intermediate incident surface 55 has a vertical width of the intermediate incident surface 55 such that the vertical width of the intermediate incident surface 55 is not less than 20% and not more than 45% of the vertical width of the incident surface 51. It is preferable to set so that the middle part (center) of the width of the light is positioned at the center of the incident surface 51.

  Moreover, in the said embodiment, although the light-diffusion part 57 (57a, 57b, and 57c) was formed as a prism which consists of a rhombus quadrangular pyramid which made the bottom face a rhombus, it is not necessarily limited to making a bottom face a rhombus. Instead, it may be formed as a prism such as a regular quadrangular pyramid whose bottom surface is a regular square, and its shape may be changed as necessary.

  Furthermore, in the present embodiment, the protruding height of the light diffusing portion 57 is 20 μm, but if the protruding height is lowered, the amount of light diffusion can be reduced, and if the protruding height is increased, the amount of light diffusion can be increased. Therefore, the protruding height may be changed according to the necessary light diffusion state.

  For example, more light is incident on the lower incident surface 56 than on the upper incident surface 54. Therefore, the light diffusion portion 57c of the lower incident surface 56 has a protruding height of 20 μm as in the present embodiment. While light is diffused so as to be mixed and color unevenness is suppressed, the light diffusion portion 57a of the upper incident surface 54 has a protrusion height of about 10 μm, and the light diffusion portion 57a (prism) itself diffuses light. The amount may be reduced.

Direct light from the light source 30 is also incident on the upper incident surface 54. When this direct light is diffused by the light diffusion portion 57a (prism) having a large amount of light diffusion, a shadow due to light diffusion on the road surface (shadow of the prism). May appear.
Then, considering that the light incident on the upper incident surface 54 is less than the light incident on other portions, the light on the upper incident surface 54 is prioritized to suppress the shadow associated with the diffusion of the direct light. For example, assuming that the diffusing portion 57a has a protrusion height of about 10 μm, the amount of light diffusion required for the light diffusing portions 57b and 57c on the other incident surfaces (the intermediate incident surface 55 and the lower incident surface 56). It is preferable that the light diffusion amount is small, that is, the light diffusion amount is the smallest.

Although the present invention has been described based on the specific embodiments, the present invention is not limited to the above embodiments.
In the above-described embodiment, the case where the arrangement density of the light diffusion portions 57b on the intermediate incident surface 55 is set to 50% has been described. However, the clarity of the cut-off line CL, that is, the workability at the time of adjustment such as aiming, and the driver Needless to say, in consideration of good visibility for the user, the design adjustment may be made to increase or decrease the arrangement density of the light diffusion portions 57b.

  Further, in the above-described embodiment, the vehicle lamp for left-side traveling has been described as an example. However, in the vehicle lamp for right-side traveling, if the light diffusing portion provided on the entrance surface of the lens is configured as described above, the same applies. Therefore, the present invention is not limited to the vehicular lamp for driving on the left side.

  As described above, the present invention is not limited to the embodiments, and modifications and improvements that do not depart from the technical idea are also included in the technical scope of the invention. It is from the description of the scope of claims for a trader.

DESCRIPTION OF SYMBOLS 10 Lamp unit 20 Heat sink 30 Light source 31 Substrate 32 Light emitting chip 40 Reflector 41 Reflecting surface 50 Lens 51 Incident surface 52 Outgoing surface 53 Flange 54 Upper incident surface 55 Intermediate incident surface 56 Lower incident surfaces 57, 57a, 57b, 57c Light diffusion part 58 Flat portion 60 Shade CL Cut-off line CL1 Upper cut-off line CL2 Oblique cut-off line CL3 Lower cut-off line F1 First focus F2 Second focus LP Low beam light distribution pattern P1, P3 Diffuse light distribution pattern P2 Condensed light distribution pattern 101L, 101R Automotive headlamp 102 Vehicle

Claims (4)

A vehicular lamp that forms a light distribution having a cut-off line that includes a light source and a lens disposed on the front side of the light source,
The lens has an upper incident surface above the center of the incident surface on which light is incident, an intermediate incident surface including the center, and a lower incident surface below the intermediate incident surface,
On the upper incident surface, the intermediate incident surface, and the lower incident surface, a light diffusing portion is formed so as to be substantially uniformly disposed,
The light diffusing portion formed on the intermediate incident surface is formed to have a lower arrangement density than the light diffusing portions formed on the upper incident surface and the lower incident surface ,
The vehicular lamp, wherein the light diffusion portion formed on the upper incident surface is formed so that the amount of light diffusion is minimized. The intermediate incident surface is formed such that the center is located approximately in the middle of the vertical width of the intermediate incident surface,
The vertical width of the intermediate plane of incidence, the vehicle lamp according to claim 1, characterized in that there is a vertical 45% or less of the width more than 20% of the width of the entire incident surface of the lens. The light diffusing portion formed on the intermediate incident surface is formed so that the end on the near side of the light diffusing portion adjacent in the horizontal direction is located on substantially the same vertical line,
The flat surface part which does not provide the said light-diffusion part extended diagonally is formed in the said intermediate entrance plane so that each said light-diffusion part may space apart, The Claim 1 or Claim 2 characterized by the above-mentioned. Vehicle lamp. A reflector provided so as to cover the light source in a semi-dome shape, and reflecting light from the light source to the lens side;
Is arranged between the reflector and the lens, according a shade for shielding a part of light reflected by the reflector, from claim 1, characterized in that it comprises the in any one of claims 3 Vehicle lamp.

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