JP2016157611A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To emit more uniform light than before from a light guide lens.SOLUTION: A vehicular lighting fixture 1 includes an LED 2 and a light guide lens 3 for emitting the light emitted from the LED 2 frontward. The LED 2 is arranged facing upward. The light guide lens 3 includes: an incident surface 31 facing the LED 2 and for allowing the light emitted from the LED 2 to enter the light guide lens 3; a reflection surface 32 located above the incident surface 31, formed as a curve surface shape with a rotation parabolic surface in which the location of the LED 2 is a focal point being a reference surface S, and for allowing the light guided from the incident surface 31 to internally reflect frontward; and an emission surface 33 located in front of the reflection surface 32 and for emitting the light internally reflected by the reflection surface 32 frontward. On the reflection surface 32, a plurality of concave-like flute cuts 32a are arranged side by side along a flat surface substantially orthogonal to the vertical direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular lamp mounted on a vehicle, and more particularly to a vehicular lamp that emits light from a light source from a light guide lens.

  2. Description of the Related Art Conventionally, a vehicular lamp that is mounted on a vehicle is known in which light from an upward or downward light source is emitted forward by a light guide lens.

  In general, in this type of vehicle lamp, as shown in FIG. 16 (a), for example, an upward LED (light emitting diode) is disposed opposite to the rear surface of the lower surface of the light guide lens, and the light guide lens located above the light guide lens. The rear surface of the upper surface is a paraboloidal reflecting surface that focuses on the position of the LED (see, for example, Patent Document 1). Therefore, the light emitted upward from the LED enters the light guide lens from the lower surface, and is internally reflected forward while being converted into parallel light by the reflecting surface, and then emitted from the front surface. The light is transmitted through the light emitting lens in front of the light guide lens, so that the light emitting lens emits light.

Further, as shown in FIG. 16B, a vehicular lamp having a two-stage light guide lens is also widely known (see, for example, Patent Document 2).
In this vehicular lamp, two sets of the above-described LED and light guide lens are arranged side by side, and the light emitting lens is disposed so as to cover the front of the two light guide lenses. Therefore, for example, by selectively lighting two LEDs having different emission colors, the light emitting lens emits light in different colors.

Japanese Patent No. 5481744 JP 2014-143200 A

However, in the conventional vehicular lamp, since the reflected light from the reflecting surface of the light guide lens is parallel light forward, uneven light is emitted vertically from the front surface of the light guide lens. . As a result, the vertical width of the light emitting part of the light emitting lens is limited, and the light emitting lens cannot emit light widely in the vertical direction. Even if light is diffused only on the front surface of the light guide lens, it is difficult to obtain sufficient diffused light in the vertical direction.
In particular, in the case where the light guide lens has a two-stage configuration, when the lighting of two LEDs is switched, only the portion located in front of the light guide lens that emits light out of the light emitting lens emits light, It is not possible to perform suitable lighting switching as if the same part emits light in different colors.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicular lamp that can emit more uniform light from a light guide lens than in the past.

In order to achieve the above object, the invention according to claim 1 is a vehicular lamp including an LED and a light guide lens that emits light emitted from the LED forward.
The LEDs are arranged in an orthogonal direction substantially orthogonal to the front-rear direction,
The light guide lens is
An incident surface that faces the LED and allows light emitted from the LED to enter the light guide lens;
It is located in the orthogonal direction of the incident surface, and is formed in a curved surface with the rotational paraboloid surface on which the LED is focused as a reference surface, and internally reflects light guided from the incident surface to the front A reflective surface to be
An emission surface that is located in front of the reflection surface and emits light internally reflected by the reflection surface to the front;
Have
A plurality of concave flute cuts along a plane substantially orthogonal to the orthogonal direction are arranged in parallel on the reflective surface.

The invention according to claim 2 is the vehicle lamp according to claim 1,
Other LEDs arranged in the orthogonal direction in front of the LED and behind the end in the orthogonal direction on the reflective surface of the light guide lens,
Another light guide lens that emits light emitted from the other LEDs forward;
Further comprising
The other light guide lens is:
Another incident surface facing the other LED;
Another reflecting surface that is located in the orthogonal direction of the other incident surface and that is formed in a curved surface with a rotational paraboloid on which the position of the other LED is focused as a reference surface;
Another exit surface located in front of the other reflective surface;
And having
The other reflective surface is located in front of a substantially half of the reflective surface opposite to the orthogonal direction side;
The light guide lens is
The reference surface is a rotational paraboloid which is located on the opposite side to the orthogonal direction side of the substantially first half of the reflecting surface, faces the other reflecting surface, and is focused on the position of the other LED. And has a curved surface
The exit surface is located in front of a substantially half of the reflecting surface on the orthogonal direction side,
A plurality of flute cuts along a plane substantially orthogonal to the orthogonal direction are arranged in parallel on the other reflective surface of the other light guide lens and the curved surface of the light guide lens. To do.

The invention according to claim 3 is the vehicle lamp according to claim 2,
Each flute cut of the other reflecting surface is formed in a convex shape, and each flute cut of the curved surface is formed in a concave shape.

According to the present invention, light emitted in an orthogonal direction (for example, upward) from the LED enters the light guide lens from the incident surface, is internally reflected forward by the reflecting surface, and exits forward from the emitting surface. At this time, since the reflection surface uses the paraboloid of revolution as the reference surface, the basic light distribution is parallel light forward, but the reflection surface has a concave shape along a plane substantially orthogonal to the orthogonal direction. Since a plurality of flute cuts are arranged side by side, the reflecting surface internally reflects forward from the incident surface while diffusing the light from the incident surface. As a result, more uniform light diffused in the orthogonal direction is emitted from the exit surface of the light guide lens.
Therefore, more uniform light can be emitted from the light guide lens as compared with the conventional case where simple parallel light is emitted.

It is a sectional side view of the vehicle lamp in 1st embodiment. It is a perspective view of LED and a light guide lens in a first embodiment. It is a top view of LED in a first embodiment, and a light guide lens. It is sectional drawing of LED and a light guide lens in the IV-IV line | wire of FIG. It is a figure which shows an analysis result, Comprising: It is a graph which shows the luminance distribution of the output surface of the light guide lens in 1st embodiment. It is a sectional side view of the vehicle lamp in 2nd embodiment. It is a perspective view of LED and a light guide lens unit in a second embodiment. It is a top view of LED in a second embodiment, and a light guide lens unit. It is sectional drawing of LED and the light guide lens unit in the IX-IX line of FIG. It is a sectional side view which shows the light ray locus | trajectory in the light guide lens unit in 2nd embodiment. It is a figure which shows an analysis result, Comprising: It is a graph which shows the luminance distribution of the lower output surface of the lower light guide lens in the second embodiment, and the upper output surface of the upper light guide lens. It is a figure which shows analysis conditions, Comprising: It is a figure which shows each part dimension. It is a figure which shows analysis conditions, Comprising: It is a figure which shows a flute cut shape. It is a figure which shows an analysis result, Comprising: The graph which shows the luminance distribution of the lower output surface of a lower light guide lens, and the upper output surface of an upper light guide lens when the combination of the flute cut shape in 2nd embodiment is changed It is. It is a figure which shows an analysis result, Comprising: It is a table | surface which shows the same content as FIG. It is a sectional side view of the principal part of the conventional vehicle lamp.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a side sectional view of a vehicular lamp 1 according to the first embodiment. FIGS. 2 and 3 are a perspective view and a plan view of an LED 2 and a light guide lens 3 provided in the vehicular lamp 1. FIG. 4 is a cross-sectional view of the LED 2 and the light guide lens 3 taken along the line IV-IV in FIG. 3.
In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to the direction viewed from the vehicular lamp 1 unless otherwise specified. .

As shown in FIG. 1, the vehicular lamp 1 includes a housing 11 whose front surface is open and a transparent outer lens 12 that covers the front opening of the housing 11.
Inside the lamp chamber defined by the housing 11 and the outer lens 12, a plurality of (four in the present embodiment; see FIG. 2, etc.) LEDs (light emitting diodes) 2,. Is housed.

  The plurality of LEDs 2,... And the light guide lens 3 are supported by the bracket 13 and are covered with a reflector 14 for allowing light leaked from the light guide lens 3 to reenter the light guide lens 3. . In addition, an inner lens 15 that covers the front of the plurality of LEDs 2,... And the light guide lens 3 is disposed, and an extension 16 that covers a portion other than the front of the light guide lens 3 is further provided. Located on the front side.

  Specifically, as shown in FIGS. 2 to 4, the plurality of LEDs 2,... Are arranged at substantially equal intervals along the left-right direction with the respective optical axes Ax facing upward, and a common substrate. 20 (see FIG. 1). Each LED 2 emits light upward substantially radially about the optical axis Ax.

  The light guide lens 3 is formed in a substantially rectangular parallelepiped shape that is slightly long in the front-rear direction, and is disposed above the plurality of LEDs 2. More specifically, the light guide lens 3 is disposed such that the rear end portion of the lower surface orthogonal to the vertical direction faces the plurality of LEDs 2,... It is an incident surface 31 on which light is incident.

A plurality of (four in this embodiment) reflecting surfaces 32 that reflect light incident on the light guiding lens 3 from the incident surface 31 forward are disposed on the rear surface of the upper surface of the light guiding lens 3 positioned above the incident surface 31. ... is provided.
The plurality of reflecting surfaces 32,... Are provided corresponding to the plurality of LEDs 2,..., And are arranged along the left-right direction over the entire left-right width of the light guide lens 3 so as to be positioned above the corresponding LEDs 2, respectively. It is installed.

Each reflecting surface 32 is formed in a planar shape having a reference surface S that is a paraboloid of revolution that is focused on the position near the corresponding LED 2. The reflecting surface 32 internally reflects (totally reflects) the light emitted from the LED 2 and incident from the incident surface 31 into the light guide lens 3.
In addition, each of the reflective surfaces 32 has a plurality of substantially bowl-like flute cuts 32a,... Vertically and horizontally (in this embodiment, 10 steps up and down and 4 columns on the left and right) over the entire surface of the reflective surface 32. It is installed side by side. The plurality of flute cuts 32a,... Are for diffusing the reflected light from the reflection surface 32 in the vertical direction, and are formed on the reference surface S of the reflection surface 32 so as to be along a plane substantially perpendicular to the vertical direction. On the other hand, it is formed in a concave shape.

  The front surface of the light guide lens 3 is orthogonal to the front-rear direction and is positioned in front of the plurality of reflecting surfaces 32,..., And emits light internally reflected by the plurality of reflecting surfaces 32,. Surface 33 is formed.

With such a configuration, in the light guide lens 3, the light emitted upward from each LED 2 enters the light guide lens 3 from the incident surface 31, and then is internally forward by the reflective surface 32 corresponding to the LED 2. The light is reflected and emitted forward from the emission surface 33.
At this time, since the reflecting surface 32 uses the paraboloid of revolution as the reference surface S, the basic light distribution is parallel light forward, but the reflecting surface 32 is along a plane substantially orthogonal to the vertical direction. Since a plurality of concave flute cuts 32a are arranged side by side, the reflecting surface 32 internally reflects the light from the incident surface 31 forward while diffusing in the vertical direction.
As a result, more uniform light is emitted from the exit surface 33 of the light guide lens 3 over the entire surface, and as a result, the inner lens 15 positioned in front of the light guide lens 3 also emits light widely.

Here, an analysis result is shown and demonstrated about the light diffusion effect by the flute cut 32a of the reflective surface 32 mentioned above.
In this analysis, the luminance distribution of the emission surface 33 when the LED 2 is turned on is calculated and compared with the case where the flute cut 32 a is not formed on the reflection surface 32.

FIG. 5 is a graph showing the analysis result, and is a graph showing the luminance distribution in the vertical direction of the emission surface 33 at the horizontal position of the LED 2.
As shown in this figure, when the flute cut 32a is not formed on the reflection surface 32, the peak luminance due to the directivity characteristics of the LED 2 occurs at the center in the vertical direction of the emission surface 33, and from this center to both the upper and lower sides. As it goes, the brightness decreases greatly.
On the other hand, when the reflective surface 32 of the present embodiment in which a plurality of flute cuts 32a,... Is applied, the peak luminance at the center in the vertical direction and the degree of decrease on both the upper and lower sides are suppressed. The luminance distribution in the direction is greatly uniformed as a whole.

As described above, according to the vehicular lamp 1 of the first embodiment, light emitted upward from the LED 2 enters the light guide lens 3 from the incident surface 31, and then is forwardly reflected by the reflecting surface 32. The light is reflected and emitted forward from the emission surface 33. At this time, since the reflecting surface 32 uses the paraboloid of revolution as the reference surface S, the basic light distribution is parallel light forward, but the reflecting surface 32 is along a plane substantially orthogonal to the vertical direction. Since a plurality of concave flute cuts 32a are arranged side by side, the reflecting surface 32 internally reflects the light from the incident surface 31 forward while diffusing in the vertical direction. As a result, more uniform light diffused in the vertical direction is emitted from the emission surface 33 of the light guide lens 3.
Therefore, more uniform light can be emitted from the light guide lens 3 as compared with the conventional case where simple parallel light is emitted, and as a result, the inner lens 15 located in front of the light can be widely emitted.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component similar to said 1st embodiment, and the description is abbreviate | omitted.
FIG. 6 is a side sectional view of the vehicular lamp 4 in the second embodiment, and FIGS. 7 and 8 are a perspective view and a plan view of the LED 5 and the light guide lens unit 6 provided in the vehicular lamp 4, FIG. 9 is a cross-sectional view of the LED 5 and the light guide lens unit 6 taken along line IX-IX in FIG.

  As shown in FIG. 6, the vehicular lamp 4 includes a plurality of (eight in this embodiment) LEDs 5,... And a light guide instead of the plurality of LEDs 2,. A lens unit 6 is provided.

  Among these, as shown in FIGS. 7 to 9, the plurality of LEDs 5,... Are mounted on a common substrate 50 (see FIG. 6) with their optical axes Ax facing upward. The plurality of LEDs 5,... Are arranged in two rows in the front and rear, which are composed of a plurality (four in the present embodiment) of front LEDs 51,... And a plurality (four in the present embodiment) of rear LEDs 52,. In each row, they are arranged at substantially equal intervals along the left-right direction. Further, the front LED 51 and the rear LED 52 have different emission colors.

  The light guide lens unit 6 corresponds to the plurality of front LEDs 51,... And the plurality of rear LEDs 52,..., And includes a lower light guide lens 61 and an upper light guide lens 62 arranged in parallel in the vertical direction while being close to each other. It is configured.

  Among these, the lower light guide lens 61 is formed in a shape similar to the light guide lens 3 in the first embodiment. Specifically, the lower light guide lens 61 is formed in a substantially rectangular parallelepiped shape that is slightly longer in the front-rear direction, and is disposed above the plurality of front LEDs 51,. More specifically, the lower light guide lens 61 is disposed such that the rear end portion of the lower surface orthogonal to the vertical direction faces the plurality of front LEDs 51,..., And the lower surface rear end portion includes the plurality of front LEDs 51. ,... Is a front incident surface 611 on which light from the incident surfaces is incident.

A plurality of (four in the present embodiment) reflect the light incident from the front incident surface 611 into the lower light guide lens 61 forward at the rear of the upper surface of the lower light guide lens 61 positioned above the front incident surface 611. ) Lower reflective surfaces 612,...
The plurality of lower reflective surfaces 612,... Are provided corresponding to the plurality of front LEDs 51,... Across the entire left and right width of the lower light guide lens 61 so as to be positioned above the corresponding front LEDs 51, respectively. It is arranged along the left-right direction.

Each lower reflective surface 612 is formed in a planar shape having a rotation paraboloid focused on the position near the corresponding front LED 51 as a reference surface S1. The lower reflective surface 612 internally reflects (totally reflects) light emitted from the front LED 51 and incident from the front incident surface 611 into the lower light guide lens 61.
Each lower reflective surface 612 has a plurality of substantially bowl-shaped flute cuts 612a,... Across the entire surface of the lower reflective surface 612 (in this embodiment, up and down five steps, left and right). 4 rows). The plurality of flute cuts 612a,... Are for diffusing reflected light from the lower reflecting surface 612 in the vertical direction, and are formed along a plane substantially orthogonal to the vertical direction, respectively. In the present embodiment, the lower reflective surface 612 is formed in a convex shape with respect to the reference surface S1.

  The front surface of the lower light guide lens 61 is orthogonal to the front-rear direction and is positioned in front of the plurality of lower reflection surfaces 612,... And internally reflected by the plurality of lower reflection surfaces 612,. Is a lower emission surface 613 for emitting the light forward.

  The upper light guide lens 62 is slightly elongated in the front-rear direction and has a rectangular parallelepiped front portion having substantially the same vertical width as the lower light guide lens 61, and the rear end of the front portion extends to the rear lower part while being curved. The lower light guide lens 61 is disposed so as to cover the upper side of the lower light guide lens 61 with a slight gap interposed between the lower light guide lens 61 and the lower light guide lens 61. More specifically, the upper light guide lens 62 is disposed above the rear lower surface orthogonal to the vertical direction so as to face the plurality of rear LEDs 52,... This is a rear side incident surface 621 on which light from.

On the upper surface of the rear portion of the upper light guide lens 62 located above the rear incident surface 621, a plurality of light beams (four in this embodiment) are reflected forward from the rear incident surface 621 into the upper light guide lens 62. ) Upper reflective surfaces 622,.
The plurality of upper reflecting surfaces 622,... Are provided corresponding to the plurality of rear LEDs 52,... Across the entire left and right width of the upper light guide lens 62 so as to be positioned above the corresponding rear LEDs 52, respectively. It is arranged along the left-right direction.

Each upper reflective surface 622 is configured in the same manner as the reflective surface 32 in the first embodiment.
Specifically, each upper reflective surface 622 is formed in a planar shape having a reference parabolic surface S2 as a rotational paraboloid in which the position near the corresponding rear LED 52 is a focal point, and in the first embodiment described above. A plurality of concave flute cuts 622a,... Configured in the same manner as the plurality of flute cuts 32a,.
Further, each upper reflection surface 622 is provided such that the upper end portion thereof is positioned in front of the front LED 51. In this embodiment, the lower reflection surface 612 of the lower light guide lens 61 is the upper reflection surface. It is provided so as to be positioned in front of the substantially lower half of 622 and below the substantially front half.

A flute cut is formed on the curved surface portion of the upper light guiding lens 62 that connects the rear end of the front lower surface and the front end of the rear incident surface 621, similar to the lower reflective surface 612 and the upper reflective surface 622. A plurality of diffusion cut surfaces 624,... Are provided.
The plurality of diffusion cut surfaces 624,... Are positioned below the front half of the plurality of upper reflection surfaces 622, and provided corresponding to the plurality of lower reflection surfaces 612,. The upper light guide lens 62 is juxtaposed along the left-right direction across the entire width of the upper light guide lens 62 so as to face the corresponding lower reflective surface 612 with a slight gap.

Each diffusion cut surface 624 is formed in a planar shape having a rotation paraboloid surface in which the position near the front LED 51 corresponding to the opposed lower reflection surface 612 as a focus is a reference surface S3.
Also, each diffusion cut surface 624 has a plurality of substantially bowl-like flute cuts 624a,... Across the entire surface of the diffusion cut surface 624 (in this embodiment, up and down five steps, left and right four rows). ). The plurality of flute cuts 624a,... Are formed along a plane that is substantially orthogonal to the vertical direction. In the present embodiment, the flute cuts 624a,. Are individually opposed to the plurality of flute cuts 612a,.

  The front surface of the upper light guide lens 62 is orthogonal to the front-rear direction and is positioned in front of the upper half of the plurality of upper reflection surfaces 622. It is an upper emission surface 623 that emits the reflected light forward. The upper emission surface 623 is formed in the same size as the lower emission surface 613 of the lower light guide lens 61 and is provided substantially flush with the lower emission surface 613 in the front-rear direction.

With such a configuration, the light guide lens unit 6 switches the lighting of the plurality of front LEDs 51,... And the plurality of rear LEDs 52,. Light can be emitted from the upper emission surface 623 of the lens 62.
Specifically, when the plurality of front LEDs 51,... Are lit, most of the light emitted upward from each front LED 51 is from the front incident surface 611, as shown in FIG. After entering the lower light guide lens 61, the light is internally reflected forward by the lower reflective surface 612 corresponding to the front LED 51 and emitted forward from the lower light emitting surface 613. At this time, since a plurality of convex flute cuts 612 a along a plane substantially perpendicular to the vertical direction are arranged in parallel on the lower reflective surface 612, the lower reflective surface 612 is light from the front incident surface 611. Are internally reflected forward while diffusing vertically.
Further, a part of the light emitted upward from each front LED 51 enters the lower light guide lens 61 from the front incident surface 611 and then goes out of the lower light guide lens 61 from the lower reflective surface 612. The light is emitted and enters the upper light guide lens 62 from the diffusion cut surface 624 facing the lower reflection surface 612. The light is internally reflected forward by the upper reflective surface 622 of the upper light guide lens 62 while being diffused in the vertical direction by the concave flute cut 622a, and is emitted forward from the upper outgoing surface 623.
As a result, the lower light exit surface 613 of the lower light guide lens 61 emits light more uniformly over the entire surface, and uniform light is emitted from the upper light exit surface 623 of the upper light guide lens 62 as well. Will be.

On the other hand, when a plurality of rear LEDs 52,... Are lit, most of the light emitted upward from each rear LED 52 is, as shown in FIG. After being incident on the upper light guide lens 62, the light is internally reflected forward by the upper reflective surface 622 corresponding to the rear LED 52 and emitted forward from the upper light output surface 623. At this time, since a plurality of concave flute cuts 622a along a plane substantially orthogonal to the up-down direction are arranged in parallel on the upper reflection surface 622, the upper reflection surface 622 allows light from the rear incident surface 621 to move up and down. Internally reflect forward while diffusing in the direction.
Further, a part of the light emitted upward from each rear LED 52 enters the upper light guide lens 62 from the rear incident surface 621 and is internally reflected by the upper reflective surface 622, and then the diffusion cut. The light is emitted from the surface 624 to the outside of the upper light guide lens 62, and enters the lower light guide lens 61 from the lower reflective surface 612 facing the diffusion cut surface 624. Then, the light is guided forward in the lower light guide lens 61 and emitted forward from the lower emission surface 613.
As a result, the upper light exit surface 623 of the upper light guide lens 62 emits light more uniformly over the entire surface, and uniform light is emitted from the lower light exit surface 613 of the lower light guide lens 61 as well. Will be.

Here, an analysis result is shown and demonstrated about the light diffusion effect by each flute cut of the lower reflective surface 612, the upper reflective surface 622, and the diffusion cut surface 624 mentioned above.
In this analysis, luminance distributions of the lower emission surface 613 and the upper emission surface 623 when the front LED 51 and the rear LED 52 are individually turned on are calculated, and the lower reflection surface 612, the upper reflection surface 622, and the diffusion cut surface 624 are calculated. These were compared with the case where no flute cut was formed.

FIG. 11 is a graph showing the analysis results, and is a graph showing the luminance distribution in the vertical direction of the lower emission surface 613 and the upper emission surface 623 at the horizontal position of the front LED 51 and the rear LED 52. ) Is when only the front LED 51 is lit, and (b) is when only the rear LED 52 is lit. The left half of each graph shows the luminance of the lower emission surface 613, and the right half shows the luminance of the upper emission surface 623.
As shown in FIG. 11A, when only the front LED 51 is lit, flute cuts are provided on the respective reflecting surfaces by providing flute cuts on the lower reflecting surface 612, the upper reflecting surface 622, and the diffusion cut surface 624, respectively. Compared to the case where no is formed, it is possible to emit more uniform light in the vertical direction from the lower emission surface 613 and to emit a certain amount of light from the upper emission surface 623 uniformly. ing.
On the other hand, when only the rear LED 52 is turned on, as shown in FIG. 11B, each of the reflecting surfaces is provided by providing flute cuts on the lower reflecting surface 612, the upper reflecting surface 622, and the diffusion cut surface 624, respectively. Compared to the case where no flute cut is formed, uniform light can be emitted from the upper emission surface 623 in the vertical direction, and a certain amount of light can be emitted uniformly from the lower emission surface 613. Is able to.

Subsequently, a combination of the flute cut shapes of the lower reflection surface 612, the upper reflection surface 622, and the diffusion cut surface 624 will be described with reference to analysis results.
In this analysis, the lower emission surface when the front LED 51 and the rear LED 52 are individually lit while changing the flute cuts of the lower reflection surface 612, the upper reflection surface 622, and the diffusion cut surface 624 to a convex shape and a concave shape. The luminance distribution of the surface 613 and the upper exit surface 623 was calculated.
The main shapes (dimensions) of each part in this analysis are as shown in FIG. As shown in FIGS. 13A to 13C, the flute cut 612a of the lower reflective surface 612 and the flute cut 622a of the upper reflective surface 622 emit light from the corresponding LED 2 at a connection point with adjacent ones. Internal reflection was performed at an angle of 30 ° in the vertical direction and 10 ° in the horizontal direction. All flute cuts were arranged at equal pitches in the vertical direction. As the front LED 51 and the rear LED 52, those having a half-value angle of 60 ° were used.

FIG. 14 is a graph showing the above analysis results, and is a graph showing the luminance distribution in the vertical direction of the lower emission surface 613 and the upper emission surface 623 at the horizontal position of the front LED 51 and the rear LED 52. ) Is when only the front LED 51 is lit, and (b) is when only the rear LED 52 is lit. FIG. 15 is a table showing the same contents as FIG. In FIG. 14, the left half of each graph shows the luminance of the lower emission surface 613, and the right half shows the luminance of the upper emission surface 623.
As shown in these figures (particularly FIG. 15), the flute cut combination in this embodiment (that is, the flute cut 622a of the upper reflective surface 622, the flute cut 624a of the diffusion cut surface 624, and the flute of the lower reflective surface 612). In the case where the cut 612a is concave, concave, or convex), the difference between the maximum luminance and the minimum luminance is the smallest level when any of the front LED 51 and the rear LED 52 is lit. It can be seen that the emission surface 613 and the upper emission surface 623 emit more uniform light in the vertical direction.

  As described above, according to the vehicle lamp 4 of the second embodiment, when the lighting of the front LED 51 and the rear LED 52 is switched, the light guide lens corresponding to the LED 5 that has been lit is more uniform in the vertical direction. In addition, it is possible to emit a uniform amount of light in the vertical direction from the light guide lens corresponding to the LED 5 that is not lit. As a result, at the time of switching the lighting, the inner lens 15 positioned in front of the light guide lens unit 6 is surfaced as if the same portion emits light with a different color (a color corresponding to the light emission color of the LED 5 being lit). Can emit light.

[Modification]
The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in each of the above embodiments, each flute cut has a substantially bowl shape, but each flute cut may be formed in a prism shape.

  Further, the light guide lens may be provided with a texture, a prism cut, a flute cut, or the like on the upper surface, the lower surface and the emission surface of the light guide lens so that the light guided inside is further diffused.

  Further, in the above analysis that searched for the combination of flute cut shapes, each flute cut of the lower reflection surface 612 and the upper reflection surface 622 internally reflects light at a connecting point of 30 ° vertically and 10 ° horizontally. Although it was assumed (refer FIG. 13), a reflection angle is not limited to this. Since the reflected light at the flute cut may be internally reflected at an angle in the vertical or horizontal direction with respect to the emission axis along the front-rear direction, this reflection angle is, for example, 10 to 45 in both the vertical direction and the left-right direction. It may be within the range of °. Needless to say, if the size and half-value angle of the LED, the size of each exit surface and each reflection surface of the light guide lens, and the like change, it is necessary to adjust the reflection angle at each flute cut within the angle range.

1 Vehicle lamp 2 LED
3 Light guide lens 31 Incident surface 32 Reflective surface S Reference surface 32a Flute cut 33 Output surface 4 Vehicle lamp 5 LED
51 Front LED (other LEDs)
52 Rear LED
6 Light guide lens unit 61 Lower light guide lens (other light guide lens)
611 Incident surface (other incident surfaces)
612 Lower reflective surface (other reflective surfaces)
S1 Reference surface 612a Flute cut 613 Lower exit surface (other exit surface)
62 Upper light guide lens 621 Incident surface 622 Upper reflective surface S2 Reference surface 622a Flute cut 623 Upper exit surface 624 Diffusion cut surface (curved surface)
S3 Reference plane 624a Flute cut

Claims (3)

A vehicular lamp including an LED and a light guide lens that emits light emitted from the LED forward,
The LEDs are arranged in an orthogonal direction substantially orthogonal to the front-rear direction,
The light guide lens is
An incident surface that faces the LED and allows light emitted from the LED to enter the light guide lens;
It is located in the orthogonal direction of the incident surface, and is formed in a curved surface with the rotational paraboloid surface on which the LED is focused as a reference surface, and internally reflects light guided from the incident surface to the front A reflective surface to be
An emission surface that is located in front of the reflection surface and emits light internally reflected by the reflection surface to the front;
Have
The vehicular lamp according to claim 1, wherein a plurality of concave flute cuts along a plane substantially orthogonal to the orthogonal direction are arranged in parallel on the reflection surface. Other LEDs arranged in the orthogonal direction in front of the LED and behind the end in the orthogonal direction on the reflective surface of the light guide lens,
Another light guide lens that emits light emitted from the other LEDs forward;
Further comprising
The other light guide lens is:
Another incident surface facing the other LED;
Another reflecting surface that is located in the orthogonal direction of the other incident surface and that is formed in a curved surface with a rotational paraboloid on which the position of the other LED is focused as a reference surface;
Another exit surface located in front of the other reflective surface;
And having
The other reflective surface is located in front of a substantially half of the reflective surface opposite to the orthogonal direction side;
The light guide lens is
The reference surface is a rotational paraboloid which is located on the opposite side to the orthogonal direction side of the substantially first half of the reflecting surface, faces the other reflecting surface, and is focused on the position of the other LED. And has a curved surface
The exit surface is located in front of a substantially half portion on the orthogonal direction side of the reflective surface, and is arranged in parallel with the other exit surface,
A plurality of flute cuts along a plane substantially orthogonal to the orthogonal direction are arranged in parallel on the other reflective surface of the other light guide lens and the curved surface of the light guide lens. The vehicular lamp according to claim 1.   3. The vehicular lamp according to claim 2, wherein each flute cut of the other reflecting surface is formed in a convex shape, and each flute cut of the curved surface is formed in a concave shape.

Images