JP2003036705A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device improved in visibility of leading vehicles running on a road 17 and decreased in glare due to illumination. SOLUTION: A case 21 is placed on the side of the road 17 at the height not more than 1 m from the surface of the road. Light is illuminated toward the running direction F of the vehicle through a light transmitting part 23 on the side of the case 21 facing the road 17 to illuminate a running vehicle from the back so as to improve visibility. A light source 28 is placed on the opposite side of the light transmitting part 23 to the running direction F. The light from the light source is reflected at a reflecting mirror 29 placed its first focus 38 at the position of the light source 28 and collected on the second focus 39 closer to the light transmitting part 23 than the first focus 38. The light collected at the second focus 39 is transformed into parallel light at a lens 31 and emitted from the light transmitting part 23 to the running direction F on the road. The glare reflected at a rearview mirror to the driver is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device used for road lighting.

[0002]

2. Description of the Related Art Conventionally, road lights, such as highways exclusively used for automobiles, have generally been equipped with a lighting fixture attached to the tip of a pole installed on the shoulder side or the median side of the road. The road lights illuminate the road from above.

Since such road lights are installed at regular intervals along the road, immediately after the preceding vehicle traveling on the road passes under the road light, the preceding vehicle is directly illuminated and succeeds. It is visible from the car, and the preceding vehicle is shadowed until it passes under one road light and reaches under the next road light. By being secured, the existence of the preceding vehicle can be visually recognized from the following vehicle by the brightness contrast between the shadow of the preceding vehicle and the road surface brightness.

[0004]

However, on a highway or the like, the road surface reflectance may become low and it may be difficult to secure the road surface brightness due to the development of high-performance pavement with improved drainage, for example. There is a problem that sufficient contrast between the shadow of the vehicle and the road surface brightness cannot be obtained, and the visibility of the preceding vehicle from the following vehicle is reduced. Also, not only the preceding vehicle traveling on the road,
There is a similar problem in visibility of obstacles on the road and vehicles stopped on the shoulder.

On a highway, there is an attempt to irradiate the spotlight toward the vehicle traveling direction of the road in order to ensure visibility in fog, but the light of the spotlight is incident on the rearview mirror of the vehicle. There is a problem that glare occurs.

Further, in general, a method of arranging a louver composed of a plurality of louver pieces in the irradiation opening of a lighting device to control the emission direction of light is adopted. It is also possible to use a combination of the louvers, but in this case, because the angle at which the louver should shield the light is small, the intervals between the louver pieces must be narrow and the area of the louver pieces must be large, which makes louver manufacturing difficult. Not only that, but the light irradiation efficiency may decrease.

The present invention has been made in view of the above points, and provides an illumination device capable of improving the visibility of a preceding vehicle traveling on a road and reducing the occurrence of glare due to illumination without using a louver. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a lighting device, which is installed at a lateral position of a road at a height of 1 m or less from a road surface and is provided so as to face the road. A lighting device main body having a portion; a light source arranged in the lighting device main body on a side opposite to a vehicle traveling direction of a road from a light transmitting portion; arranged in the lighting device main body so as to face the light source; The first focal point and the reflection of the light from the light source
A reflecting mirror for focusing light at a second focal point closer to the light transmissive portion than the focal point; a light blocking unit arranged at the position of the second focal point for blocking light not focused at the second focal point; second focal point and light transmissive portion And a lens which is disposed between the first focus and the second focus to emit the light in the vehicle traveling direction of the road through the light transmitting portion.

The main body of the lighting device is installed at a lateral position of the road at a height of 1 m or less from the road surface,
By irradiating light toward the vehicle traveling direction of the road through the light transmitting portion of the main body of the lighting device facing the road, the vehicle traveling on the road is illuminated from the rear side and the visibility is improved. Moreover, the light of the light source is reflected by the reflecting mirror whose first focal point is the position of the light source disposed on the opposite side of the light transmitting portion of the illuminating device main body with respect to the vehicle traveling direction, and the light transmitting portion from the first focal point is reflected. The light which is not focused on the second focus is blocked by the light blocking means at the position of the second focus nearer to the second focus, and the light passing through the second focus is advanced by the lens through the light transmitting portion to the vehicle traveling on the road. By emitting the light in the direction, the occurrence of glare given to the driver through the rearview mirror of the vehicle without using the louver is reduced, and the light irradiation efficiency is improved as compared with the case where the louver is used.

An illumination device according to a second aspect is the illumination device according to the first aspect, wherein the light blocking means has a lower light blocking member that blocks light below an optical axis connecting the first focus and the second focus. Is what you are doing.

The lower light blocking member of the light blocking means blocks the light below the optical axis connecting the first focus and the second focus, so that the light is prevented from being emitted upward through the lens and the glare is prevented. Occurrence is reduced.

According to a third aspect of the present invention, there is provided the illuminating device according to the first aspect, wherein the light shielding means shields light below a light axis connecting the first focus and the second focus. The upper light-shielding body for blocking the above light is provided, and the interval between the lower light-shielding body and the upper light-shielding body is narrowly provided from the road opposite side to the road side.

The lower light shield of the light shielding means shields the light below the optical axis connecting the first focus and the second focus, so that the light is prevented from being emitted upward through the lens and the glare is prevented. The light emitted from the upper part of the light shield means blocks the light above the optical axis, so that the light emitted downward through the lens is limited, and the brightness of the road surface near the main body of the lighting device increases. Is prevented from passing,
Moreover, since the distance between the lower light shield and the upper light shield is narrow from the road opposite side to the road side, the light is suppressed from spreading through the lens in the direction close to the main body of the lighting device, and the light in the direction far away. spread.

According to a fourth aspect of the present invention, in the illuminating device according to the first aspect, the light shielding means comprises a light shielding portion for shielding the light which is not condensed at the second focus, and a second portion inside the light shielding portion.
It has a light shield having an opening through which the light focused on the focus passes.

Then, the light-shielding member of the light-shielding means having the light-shielding portion for shielding the light not condensed at the second focal point and the opening portion through which the light condensed at the second focal point passes through the lens, through the lens. It prevents the light from being emitted upward, reduces the occurrence of glare, and limits the light emitted downward through the lens to prevent the brightness of the road surface near the lighting device body from becoming too high. Moreover, it becomes possible to control the degree of light spread in the width direction of the road.

An illumination device according to claim 5 is the illumination device according to any one of claims 1 to 4, wherein the light shielding means is
A second reflecting mirror is provided which has a reflecting surface portion that blocks and reflects the light that is not condensed at the second focus, and reflects the light reflected by the reflecting surface portion in the vehicle traveling direction of the road.

Then, the second reflecting surface portion of the light shielding means
The light not focused on the focal point is blocked and reflected, and the light reflected on the reflecting surface is reflected by the second reflecting mirror in the vehicle traveling direction of the road. Is reduced, and the light irradiation efficiency is improved by emitting the light that is shielded.

An illumination device according to a sixth aspect is the illumination device according to any one of the first to fifth aspects, further comprising a prism body for refracting the light passing through the lens toward the road side.

Since the prism body refracts the light passing through the lens toward the road side, the road side is irradiated with the light without affecting the vertical light irradiation.

An illumination device according to a seventh aspect is the illumination device according to the sixth aspect, wherein the prism body has a plane parallel to the optical axis connecting the first focus and the second focus, and 5 with respect to the optical axis.
It has a plurality of prism portions provided with prism surfaces inclined at an angle of 0 ° to 70 °.

The prism body has a plane parallel to the optical axis connecting the first focus and the second focus, and 5 with respect to the optical axis.
Since it has a plurality of prism portions provided with prism surfaces inclined at an angle of 0 ° to 70 °, light passing through the lenses is refracted toward the road side by the prism surface of each prism portion,
Light is efficiently emitted only to the road side.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

1 to 8 show a first embodiment, FIG. 1 is a schematic plan view of a lighting device, FIG. 2 is a schematic side view of an optical system of the lighting device, and FIG. 3 is an arrangement of the lighting device on a road. 4 is an explanatory view showing the relationship between the lane and the angle viewed from the optical axis at the position of the lighting device, FIG. 5 is a schematic side view of an optical system showing a modification of the light blocking means of the lighting device, FIG. 6 is an explanatory view showing a relationship between an optical axis, a light blocking means and a lens in a modified example of the light blocking means, and FIG. 7 shows a relationship between an optical axis, a light blocking means and a lens in another modified example of the light blocking means of the illumination device. FIG. 8 is an explanatory diagram showing the relationship between the optical axis, the light blocking means, and the lens in still another modification of the light blocking means of the illumination device.

As shown in FIG. 3, the lighting device 11 is, for example, an expressway exclusively for automobiles and has a shoulder 12, a first lane 13, a second lane 14, a third lane 15, and a median strip 16 in the width direction W.
On the road 17 with the shoulder 12 side and the median strip 16
The height of the road 17 from the road surface is 1 at the side of the side road 17.
It is installed at a height position of m or less, and is installed at regular intervals along the vehicle traveling direction F of the road 17. Then, the illumination device 11 performs so-called low position pro-beam illumination in which light is emitted from the low position in the vehicle traveling direction F to illuminate.

As shown in FIG. 1, the illuminating device 11 has a case 21 as a main body of the illuminating device. The case 21 is formed in an elongated box shape corresponding to the traveling direction F of the vehicle. The side plate 22, which is a side face that is substantially parallel to the vehicle, has an opening 24 that forms a light transmitting portion 23 in a region near the vehicle traveling direction F. A light transmitting member 25, such as a transparent glass plate or a transparent plate made of resin such as polycarbonate, is attached to the opening 24 of the light transmitting portion 23 in a hermetically sealed state.

As shown in FIGS. 1 and 2, in the case 21, an optical system 33 composed of a light source 28, a reflecting mirror 29, a light shielding means 30, a lens 31, and a secondary reflecting plate 32 as a specular reflecting plate. And a lighting circuit 34 for lighting the light source 28.

The light source 28 is, for example, a discharge lamp such as an HID lamp having a rated power of about 70 W, and has a cylindrical arc tube having a light emitting portion at the center.

The reflecting mirror 29 is disposed inside the case 21 at an inner position on the opposite side of the light transmitting portion 23 with respect to the vehicle traveling direction F of the road 17, and is formed of a parabolic or elliptic rotating body. It has a reflective surface 37. The reflection surface 37 sets the position of the light source 28 to the first focal point 38, reflects the light of the light source 28 at the first focal point 38, and focuses the light on the second focal point 39 near the light transmitting portion 23 from the first focal point 38. It is formed in a shape.

The light shielding means 30 is arranged at the position of the second focal point 39 and shields the light which is not condensed at the second focal point 39, and the light of the optical system 33 connecting the first focal point 38 and the second focal point 39. It has a plate-shaped lower light shield 41 that shields light below the axis 40. The upper edge of the lower light shield 41 cannot sufficiently reduce the occurrence of glare if it is lower than the optical axis 40, and if it is higher than the optical axis 40, the ratio of blocking light increases and the light irradiation efficiency decreases. Considering the reduction of the generation of glare and the improvement of the light irradiation efficiency, it is most suitable to contact the position of the optical axis 40.

The lens 31 is arranged between the second focal point 39 and the light transmitting portion 23 and has a surface facing the second focal point 39 as a flat surface and a surface facing the light transmitting portion 23 as a convex curved surface. And the second focal point 39 of the optical axis 40 as the focal point
The light that has passed through 39 is refracted into parallel light parallel to the optical axis 40 and emitted through the light transmitting portion 23 in the traveling direction of the vehicle on the road 17.

The secondary reflecting plate 32 is arranged in a region facing the light transmitting portion 23 extending from the end portion of the lens 31 opposite to the road 17 side to the end portion of the light transmitting portion 23 on the vehicle traveling direction F side. , The light that is inclined at an angle of 0 to 30 ° toward the inside of the road 17 with respect to the vehicle traveling direction F and reflects the light that cannot be controlled by the reflecting mirror 29 or the lens 31 toward the vehicle traveling direction F of the road 17. Let The reflecting surface of the secondary reflecting plate 32 facing the light transmitting portion 23 is formed into a mirror surface, and the reflecting surface has a flat surface and a part of a cylinder.

Further, on the inner surface and the outer surface of the light transmitting member 25, a thin film having an antireflection effect or a photocatalyst film composed of a photocatalyst layer containing titanium oxide as a main component is formed.

The lighting device 11 is located laterally of the road 17 on the road shoulder 12 side and the median strip 16 side, and the height of the road 17 from the road surface is 1 m or less, for example 0.7 m. It is installed at a position such that the optical axis 40 of the optical system 33 has a horizontal angle of 10 to 30 ° to the inside of the road 17 with respect to the vehicle traveling direction F of the road 17.
The depression angle is set to 0 to 5 degrees.

When the light source 28 of the lighting device 11 is turned on, the light source 28
The light from the reflecting mirror 29 toward the reflecting mirror 29 is reflected by the reflecting mirror 29 and focused on the second focal point 39, and the light passing through the second focal point 39 is refracted through the lens 31 into parallel light parallel to the optical axis 40. Light is emitted in the vehicle traveling direction F of the road 17 through the light transmitting portion 23. Direct light from the light source 28 toward the second focal point 39 is emitted in the vehicle traveling direction F of the road 17 through the lens 31 and the light transmitting portion 23.

At this time, since the light source 28 has a certain size, there is a large amount of light which is not focused on the second focal point 39 of the reflecting mirror 29 and spreads vertically and horizontally, but at the second focal point 39. By blocking the light below the optical axis 40 by the arranged lower light shield 41, it is possible to prevent the light from being emitted upward through the lens 31.

Further, the secondary reflecting plate disposed in a region facing the light transmitting portion 23 extending from the end portion of the lens 31 opposite to the road 17 side to the end portion of the light transmitting portion 23 on the vehicle traveling direction F side. Light that cannot be controlled by the reflecting mirror 29 or the lens 31 is reflected by 32 toward the vehicle traveling direction F of the road 17.

Thus, the peak light distribution of the light emitted through the light transmitting portion 23 of the illuminating device 11, that is, the optical axis 40, is determined by the road 17
The horizontal angle to the inside of road 17 with respect to the vehicle traveling direction F is 10
The angle of depression is about 30 ° and the depression angle is about 0-5 °.

Therefore, the case 21 is installed at a side position of the road 17, and light is emitted toward the vehicle traveling direction F of the road 17 through the light transmitting portion 23 provided on the side plate 22 of the case 21 facing the road 17. Therefore, it is possible to directly illuminate a vehicle traveling on the road 17, a vehicle stopped at the shoulder 12 and an obstacle on the road 17 from the rear side, and even if the road surface reflectance of the road 17 is low, Visibility can be improved.

Moreover, by installing the lighting device 11 at a height of 1 m or less from the road surface of the road 17, glare given to the driver through the rearview mirror of the vehicle can be reduced. That is, since the height of the side mirror, which is one of the rearview mirrors of passenger cars, is about 1 m, the lighting device 11
Is installed at a height of 1 m or less from the road surface of the road 17, it is possible to prevent the light emitted from the lighting device 11 from entering the side mirror, and give it to the driver through the side mirror of the vehicle. Glare can be reduced.

Further, since the lower light shield 41 of the light shield means 30 shields the light below the optical axis 28, it is possible to prevent the light from being emitted upward through the lens 31 and reduce the occurrence of glare. As a result, it is possible to reduce the occurrence of glare that is given to the driver through the rearview mirror of the vehicle without using the louver, and to improve the light irradiation efficiency as compared with the case where the louver is used.

Further, the peak distribution of the light emitted through the light transmitting portion 23 of the illuminating device 11 is such that the horizontal angle of the road 17 inward with respect to the vehicle traveling direction F is 10 to 30 °, and the depression angle is 0.
By setting the angle to 5 °, it is possible to properly obtain the evenness of illumination and surely reduce the glare. Horizontal angle is 10
When the angle is less than °, the illuminated range is limited to a narrow area near the installation location on the side of the road shoulder 12 side or the median strip 16 side, and the uniformity in the width direction W decreases, while when it is more than 30 ° ,
The light does not reach far in the vehicle traveling direction F, and the vehicle traveling direction F
The space between the lighting device 11 and the lighting device 11 installed along the road becomes dark, and the uniformity in the vehicle traveling direction F is reduced. Further, when the depression angle is 0 ° or more, light is incident on the rearview mirror of the vehicle, and glare is felt by the driver through the rearview mirror. On the other hand, when the depression angle is 5 ° or more, the light is far in the width direction W. However, the illuminated area is limited to a narrow area near the installation location on the road shoulder 12 side or the median strip 16 side, and the uniformity in the width direction W decreases.

Further, the secondary reflecting plate disposed in a region facing the light transmitting portion 23 extending from the end of the lens 31 opposite to the road 17 side to the end of the light transmitting portion 23 on the vehicle traveling direction F side. The light that cannot be controlled by the reflecting mirror 29 and the lens 31 is reflected toward the vehicle traveling direction F on the road 17 by the light source 32, and the light source 28
The light can be effectively used and the irradiation efficiency can be improved.

Further, by forming a thin film having an antireflection effect on the light transmitting member 25 of the light transmitting portion 23, the light of the light source 28 is suppressed from being reflected by the light transmitting member 25 into the case 21, and the light is transmitted. The light of the light source 28 transmitted through the member 25 can be increased to improve the light irradiation efficiency. By using a photocatalytic film for the thin film,
In addition to antireflection effect, antifouling effect is obtained, and light transmitting member
It is possible to prevent a decrease in light amount due to 25 stains.

Further, FIG. 4 shows the optical axis at the height position of the illuminating device 11.
The relationship between the angle viewed from 40 and each of the lanes 13 to 15 is shown. The lighting device 11 is arranged on the side of the road shoulder 12, and the lower side of the first lane 13 is the region of the road shoulder 12 and the third The area above the lane 15 is the median strip 16.

When viewed from the position of the illuminating device 11, the road shoulder 12 has a large prospective angle and the distance from the illuminating device 11 is small. growing. When the brightness of the road shoulder 12 is high, the lane mark between the road shoulder 12 and the first lane 13 tends to be difficult to identify. Therefore, it is necessary to limit the light emitted downward.

Therefore, as shown in FIG. 5 and FIG. 6, as the light-shielding means 30, a plate-like member for shielding the light above the optical axis 40 with a space above the lower light-shielding body 41 at the second focus 39 is provided. An upper light shield 42 is provided. The upper light shield 42 blocks the light above the optical axis 40, so that the light that spreads and is irradiated to the road shoulder 12 through the lens 31 is limited, and the brightness of the road shoulder 12 near the case 21 becomes too high. Can be prevented. Therefore, the lane mark between the road shoulder 12 and the first lane 13 can be easily identified.

Further, as shown in FIG. 4, there is an inclination of about 10 ° to 20 ° between the first lane 13 and the road shoulder 12 side.

Therefore, as shown in FIG.
The lower end portion of the vehicle is inclined so as to descend from the opposite side of the road 17 to the side of the road 17, that is, the lower light shield 41 and the upper light shield.
By narrowing the distance from 42 from the opposite side of the road 17 to the road 17 side, it is possible to suppress the spread of light in the direction close to the road shoulder 12 through the lens 31 and the direction far from the road shoulder 12, that is, each lane 13 to 15 side. You can let the light spread. The inclination of the lower end of the upper light shield 42 is appropriately set according to the shape of the road 17.

Further, as shown in FIG. 8, as the light-shielding means 30, a plate-like light-shielding portion 45 for shielding the light which is not condensed at the second focus 39 and the second focus 39 inside the light-shielding portion 45 are collected. It is also possible to use a light shield 47 having an opening 46 through which the emitted light passes. The light shield 47 has a lower light shield 41 forming the lower edge of the opening 46 and an upper light shield 42 forming the upper edge of the opening 46.
Each of the upper light shields 42 is provided so as to be independently movable in the vertical direction, and the upper light shield 42 is provided so that its inclination angle can be adjusted.

As a result, the road 17 on which the lighting device 11 is installed is installed.
The positions of the lower light-shielding body 41 and the upper light-shielding body 42 can be adjusted according to the shape of, and versatility can be obtained. Moreover, the degree of light spreading in the width direction W of the road 17 can be controlled by the both side edges of the opening 46.

Next, FIGS. 9 to 11 show a second embodiment, FIG. 9 (a) is a schematic side view of the optical system, and FIG. 9 (b) is a schematic side view showing the optical path of the optical system. FIG. 10 is an illuminance distribution diagram with respect to the distance from the second focus, and FIG. 11 is a schematic sectional view of an optical system showing a modified example of the light shielding means of the illumination device.

As shown in FIG. 9, a light-shielding means 30 has a lower light-shielding body 41, and a second focal point 39 is located in an upper region near the optical axis 40 of the surface of the lower light-shielding body 41 facing the light source 28 side. A reflective surface portion 50 is formed to block and reflect the light that is not condensed to
The lower side of the reflection surface portion 50 is formed as a light shielding surface portion 51 that shields light that is not condensed at the second focal point 39. Further, a second reflecting mirror 52 for reflecting the light reflected by the reflecting surface portion 50 through the light transmitting portion 23 in the vehicle traveling direction F of the road 17 is provided. The reflecting surface portion 50 and the second reflecting mirror 52 are mirror surfaces.

The reflecting surface portion 50 of the lower light shield 41 has the upper end on the optical axis.
At a position of 40, the lower end is at a distance of, for example, 10 mm or less from the optical axis 40, and is formed on a substantially flat surface having an inclination of 45 ° ± 5 ° downward with respect to the optical axis 40.

The second reflecting mirror 52 has a reflecting surface formed of a parabolic rotating body or an elliptic rotating body on the surface facing the reflecting surface portion 50 of the lower light shield 41. Due to the reflecting surface of the second reflecting mirror 52, the light reflected by the reflecting surface portion 50 is directed 10 degrees downward from the horizontal plane in the vehicle traveling direction F with respect to the optical axis 40.
Reflect in the direction of an angle of ~ 20 °.

In this case, the shape and angle of the reflecting surface 50 and the second
The direction of the light reflected by the reflecting surface section 50 is adjusted by considering the shape and the balance with the angle of the reflecting mirror 52, and the road surface brightness is set to be uniform.

In this embodiment, the reflecting mirror 29 is constructed as the first reflecting mirror.

As shown in FIG. 10 which is an illuminance distribution chart with respect to the distance from the second focal point 39, it is close to the optical axis 40 of the second focal point 39.
The density of light passing through a position within mm is high, and the density of light decreases as the distance from the optical axis 40 increases. Light is reflected by the reflecting surface portion 50 arranged at a position with a high light density within 10 mm and is used as outgoing light through the second reflecting mirror 52, and is reflected by the light shielding surface portion 51 arranged at a position with a low light density. Shade out.

As described above, the second focal point is formed by the reflecting surface section 50.
The reflection surface section 50 blocks and reflects the light that is not focused on 39.
The light reflected by the second reflecting mirror 52 is reflected by the second reflecting mirror 52 in the vehicle traveling direction F of the road 17, so that the light that is not focused on the second focus 39 can be blocked and the occurrence of glare can be reduced. The light irradiation efficiency can be improved by effectively utilizing the light for emission.

In addition, as shown in FIG.
With the additional arrangement, it is possible to limit the light that spreads and is irradiated to the road shoulder 12 portion through the lens 31, for example, and prevent the brightness of the road shoulder 12 portion near the case 21 from becoming too high.

In this case, the angle at which the light is reflected by the second reflecting mirror 52, considering the size of the reflecting surface portion 50 and the light shielding by the upper light shield 42 arranged above the optical axis 40, The road surface brightness is set to be uniform.

The same effect can be obtained if the reflecting surface section 50 is integrated with the lower light shield 41 or separate from it.

Next, FIGS. 12 to 15 show a third embodiment. FIG. 12 is a schematic plan view of an illuminating device, and FIG.
13A is an enlarged plan view in which a lens and a prism body of the illumination device are enlarged, FIG. 13B is an enlarged plan view in which the prism body is further enlarged, and FIG. 14 is a schematic plan view showing a modified example of the illumination device.
FIG. 15 is a schematic plan view showing another modified example of the lighting device.

As shown in FIG. 12, in the case where the case 21 has the light transmitting portion 23 on the end face in the vehicle traveling direction F, as an optical system 33, in addition to the light source 28, the reflecting mirror 29, the light shielding means 30 and the lens 31, A prism body 55 for refracting the light passing through the lens 31 toward the road 17 side is provided between the lens 31 and the light transmitting portion 23. In this case, the optical axis 40 connecting the first focus 38 and the second focus 39 is parallel to the vehicle traveling direction F or slightly inclined to the road 17 side.

In the prism body 55, the surface facing the lens 31 is formed to be a flat surface, and the surface facing the light transmitting portion 23 is provided in the vertical direction perpendicular to the road surface of the road 17 and in the horizontal direction in the same section. It is composed of a prism sheet in which a plurality of prism portions 56 are formed in parallel.

As shown in FIG. 13, each prism portion 56 has
A parallel surface 57 facing the road 17 side and parallel to the optical axis 40,
And a prism surface 58 which faces the side opposite to the road 17 and is inclined at an angle α of 50 ° to 70 ° with respect to the optical axis 40, and is formed into a substantially right-angled triangle in cross section. Incident light is on the prism surface 58 on the road
Refracted to the 17 side. When the angle α of the prism surface 58 is 50 ° or less, the light is totally reflected and it is difficult to control the emitting direction of the light. When the angle α is 70 ° or more, the light is difficult to be refracted and the light passing through the lens 31 is difficult to refract. In order to refract the light toward the road 17 side, the range of 50 ° to 70 ° is optimal.

As the light-shielding means 30, any of the light-shielding means 30 shown in the above-mentioned respective embodiments is used.

Since the parallel light passing through the lens 31 is refracted toward the road 17 side by the prism body 55, the light can be emitted to the road 17 side without affecting the vertical light irradiation. .

In particular, the prism body 55 has the first focus 38 and the second focus 38.
A parallel plane 57 parallel to the optical axis 40 connecting the focal point 39, and the optical axis 40
The prism surface 58 inclined at an angle of 50 ° to 70 ° with respect to
Since it has a plurality of prism parts 56 provided with
The light that has passed 31 passes through the prism surface 58 of each prism 56
The light is refracted toward the 17 side, and light can be efficiently emitted only to the road 17 side.

Further, since the light transmitting portion 23 of the case 21 is formed on the end face in the vehicle traveling direction F, the side plate 22 of the case 21 has no light emitting portion, and the occupant of the vehicle mounts the lighting device 11 in the width direction W. It is possible to prevent the occurrence of glare when looking directly from above.

Further, as shown in FIG. 14, only a part of the parallel light passing through the lens 31 is made incident on the prism body 55 to be refracted, and the remaining parallel light is emitted as it is to irradiate the light. You can widen the direction. First in this case
The optical axis 40 connecting the focal point 38 and the second focal point 39 is the vehicle traveling direction F.
The road is inclined to the 17 side.

Further, as shown in FIG. 15, in the case 21, the optical axis 40 connecting the first focus 38 and the second focus 39 is inclined toward the road 17 side with respect to the vehicle traveling direction F, and the lens All or part of the parallel light that passes through 31 is a prism body
It can also be refracted at 55 and emitted to the road 17 side.

[0072]

According to the lighting device of the first aspect, the height of the lighting device main body at the lateral position of the road from the road surface is 1 or less.
Installed at a height of m or less, and illuminating the vehicle traveling on the road from the rear by illuminating light toward the vehicle traveling direction of the road through the light transmitting part of the lighting device body facing the road, and visually recognizing it. You can improve the property. Moreover, the light of the light source is reflected by the reflecting mirror whose first focal point is the position of the light source disposed on the opposite side of the light transmitting portion of the illuminating device main body with respect to the vehicle traveling direction, and the light transmitting portion from the first focal point is reflected. The light which is not focused on the second focus is blocked by the light blocking means at the position of the second focus nearer to the second focus, and the light passing through the second focus is advanced by the lens through the light transmitting portion to the vehicle traveling on the road. By emitting the light in the direction, it is possible to reduce the occurrence of glare that is given to the driver through the rearview mirror of the vehicle without using the louver, and it is possible to improve the light irradiation efficiency as compared with the case where the louver is used.

According to the illuminating device of the second aspect, in addition to the effect of the illuminating device of the first aspect, the lower light shield of the light shielding means is located below the optical axis connecting the first focus and the second focus. Since the light is blocked, it is possible to prevent the light from being emitted upward through the lens and reduce the occurrence of glare.

According to the illuminating device of the third aspect, in addition to the effect of the illuminating device of the first aspect, the lower light-shielding member of the light-shielding means is located below the optical axis connecting the first focus and the second focus. Since the light is blocked, it is possible to prevent the light from being emitted upward through the lens and reduce the occurrence of glare. Also, since the upper light blocking member of the light blocking unit blocks the light above the optical axis, the light is blocked downward through the lens. It is possible to limit the emitted light and prevent the brightness of the road surface close to the main body of the lighting device from becoming too high.Moreover, since the distance between the lower light shield and the upper light shield is narrow from the road opposite side to the road side, through the lens. It is possible to suppress the spread of light in the direction close to the main body of the lighting device on the road surface and to spread the light in the direction far away.

According to the illuminating device of the fourth aspect, in addition to the effect of the illuminating device of the first aspect, the light shielding portion for shielding the light not condensed at the second focal point and the second portion inside the light shielding portion.
The light-shielding member of the light-shielding means having the opening through which the light focused at the focal point can prevent light from being emitted upward through the lens, can reduce the occurrence of glare, and can emit light emitted downward through the lens. It is possible to prevent the brightness of the road surface near the lighting device main body from becoming too high, and it is possible to control the spread of light in the width direction of the road.

According to the lighting device of the fifth aspect, in addition to the effect of the lighting device of the first aspect,
The light not focused on the second focal point is blocked and reflected by the reflection surface portion of the light shielding means, and the light reflected by the reflection surface portion is changed to the second light.
Since the light is reflected by the reflecting mirror in the vehicle traveling direction on the road, it is possible to block the light that is not focused on the second focus and reduce the occurrence of glare, and it is possible to improve the light irradiation efficiency by emitting the blocked light.

According to the lighting device of the sixth aspect, in addition to the effects of the lighting device of the first aspect,
Since the light passing through the lens is refracted toward the road side by the prism body, the light can be emitted to the road side without affecting the irradiation of light in the vertical direction.

According to the illuminating device of the seventh aspect, in addition to the effect of the illuminating device of the sixth aspect, the prism body has the first structure.
Since it has a plurality of prism portions provided with a parallel surface that is parallel to the optical axis connecting the focal point and the second focal point and a prism surface that is inclined at an angle of 50 ° to 70 ° with respect to the optical axis, it passes through the lens. Light is refracted toward the road side by the prism surface of each prism portion, and the light can be efficiently emitted only to the road side.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a lighting device showing a first embodiment of the present invention.

FIG. 2 is a schematic side view of an optical system of the above illumination device.

FIG. 3 is an explanatory diagram for explaining the arrangement of the lighting device on the road.

FIG. 4 is an explanatory diagram showing a relationship between an lane and an angle when viewed from the optical axis at the position of the illumination device.

FIG. 5 is a schematic side view of an optical system showing a modified example of the light blocking unit of the illumination device.

FIG. 6 is an explanatory diagram showing a relationship among an optical axis, a light blocking means, and a lens in a modification of the above light blocking means.

FIG. 7 is an explanatory diagram showing a relationship between an optical axis, a light blocking means, and a lens in another modification of the light blocking means of the same illumination device.

FIG. 8 is an explanatory diagram showing a relationship between an optical axis, a light blocking unit, and a lens in still another modified example of the light blocking unit of the illumination device.

9A and 9B show an illumination device according to a second embodiment, FIG. 9A is a schematic side view of an optical system, and FIG. 9B is a schematic side view showing an optical path of the optical system.

FIG. 10 is an illuminance distribution diagram with respect to the distance from the second focus of the above.

FIG. 11 is a schematic cross-sectional view of an optical system showing a modified example of the light shielding means of the same illumination device.

FIG. 12 is a schematic plan view of an illuminating device showing a third embodiment.

FIG. 13 (a) is an enlarged plan view in which a lens and a prism body of the illumination device are enlarged, and FIG. 13 (b) is an enlarged plan view in which the prism body is further enlarged.

FIG. 14 is a schematic plan view showing a modification of the above illumination device.

FIG. 15 is a schematic plan view showing another modification of the above illumination device.

[Explanation of symbols]

11 Lighting device 17 roads 21 Case as the lighting device body 23 Light transmission part 28 Light source 29 Reflector 30 Shading means 31 lens 38 First focus 39 Second focus 40 optical axis 41 Lower light shield 42 Upper light shield 45 Light shield 46 opening 47 light shield 50 Reflective surface 52 Second reflector 55 Prism body 56 Prism part 57 Parallel plane 58 Prism surface

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Claims (7)

[Claims] 1. A lighting device main body, which is installed at a lateral position of the road at a height of 1 m or less from the road surface and has a light transmitting portion facing the road; A light source that is disposed on the opposite side of the light transmitting portion with respect to the vehicle traveling direction of the road; and is disposed so as to face the light source in the main body of the lighting device, and the light source position is set to the first focal point, A reflecting mirror for condensing light at a second focal point closer to the light transmissive portion than the first focal point; a light shielding unit arranged at a position of the second focal point for shielding light not condensed at the second focal point; A lens which is disposed between the light source and the second focus and emits the light passing through the second focus in the vehicle traveling direction of the road through the light transmitting portion;
An illuminating device comprising: 2. The illumination device according to claim 1, wherein the light shielding unit has a lower light shield that shields light below an optical axis connecting the first focus and the second focus. 3. The light blocking means has a lower light blocking body for blocking light below the optical axis connecting the first focus and the second focus and an upper light blocking body for blocking light above the optical axis. The lighting device according to claim 1, wherein a distance between the upper light shield and the upper light shield is narrower from the road opposite side to the road side. 4. The light blocking means has a light blocking body having a light blocking portion for blocking light not focused on the second focus and an opening inside which the light focused on the second focus passes. The lighting device according to claim 1, wherein: 5. The light shielding means has a reflecting surface portion that shields and reflects the light that is not condensed at the second focal point, and the second reflecting mirror that reflects the light reflected by the reflecting surface portion in the traveling direction of the vehicle on the road. The lighting device according to any one of claims 1 to 4, further comprising: 6. The lighting device according to claim 1, further comprising a prism body that refracts light that has passed through the lens toward the road side. 7. The prism body has a plane parallel to the optical axis connecting the first focal point and the second focal point, and 50 ° to the optical axis.
7. The lighting device according to claim 6, further comprising a plurality of prism portions provided with prism surfaces inclined at an angle of 70 °.