JP2023012692A - Illuminating device - Google Patents

Abstract

To allow light to be applied to a distant place while reducing the size of an illuminating device.SOLUTION: An illuminating device 100 comprises: a light emitting element 1; a lens 2 comprising an incidence port 21 for receiving light emitted from the light emitting element 1, and an emission port 22 for emitting the light received by the incidence port 21; and a mirror 3 for receiving the light from the emission port 22, and emitting the light. The light emitting element 1, the lens 2, and the mirror 3 are arranged side by side in an optical axis direction of the light emitting element 1. The mirror 3 emits the light in a direction different from the optical axis direction.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to lighting devices.

2. Description of the Related Art Conventionally, there has been known a road lighting device that is arranged on a wall surface on the side of a road.

The lighting fixture of Patent Literature 1 includes an LED (light emitting element), an upper reflecting mirror arranged above the LED, and a lower reflecting mirror arranged below the LED. In Patent Document 1, the upper reflecting mirror reflects the light emitted upward from the LED more downward than in the horizontal direction, and the lower reflecting mirror reflects the light emitted downward from the LED more downward than in the horizontal direction. there is With this light distribution, in Patent Document 1, the glare felt by the driver of the vehicle running on the road surface is suppressed.

JP 2016-192299 A

By the way, in Patent Document 1, in order to illuminate a distant place brightly while suppressing glare, it is necessary to extend the upper reflecting mirror and the lower reflecting mirror in the horizontal direction. For this reason, when trying to irradiate light over a long distance, the size of the lighting device becomes large.

An object of the present disclosure is to provide an illumination device capable of irradiating light over a long distance while suppressing the size of the illumination device.

To achieve the above object, a lighting device according to an embodiment of the present disclosure includes a light emitting element, an entrance that receives light emitted from the light emitting element, and an exit that emits the light received by the entrance. and a mirror that receives light from the exit opening and emits the light, wherein the light emitting element, the lens, and the mirror are arranged side by side in the optical axis direction of the light emitting element. The mirror emits light in a direction different from the optical axis direction, the entrance is formed in a concave shape so as to surround the light emitting element, and the first entrance surface, which is the bottom surface thereof, is formed between the light emitting element and the light emitting element. The lens further has a first reflecting surface that reflects light incident on a second entrance surface, which is a side surface of the entrance, toward the exit.

According to the present disclosure, it is possible to irradiate light over a long distance while reducing the size of the lighting device.

1 is a perspective view of a lighting device according to a first embodiment; FIG. Sectional drawing of the illuminating device which concerns on 1st Embodiment. The figure which shows the optical path of the illuminating device which concerns on 1st Embodiment. The top view of the illuminating device which concerns on 1st Embodiment. 1 is a front view of a lighting device according to a first embodiment; FIG. The figure which shows the arrangement|positioning relationship when the illuminating device which concerns on 1st Embodiment is arrange|positioned on a road. 4A and 4B are diagrams showing the illuminance distribution and the luminous intensity angular distribution of the lighting device according to the first embodiment; FIG. The figure which shows the illuminating device which concerns on 2nd Embodiment. Sectional drawing of the illuminating device which concerns on 3rd Embodiment. Sectional drawing of the illuminating device which concerns on 3rd Embodiment. FIG. 5 is a cross-sectional view showing another example of the lighting device according to the first to third embodiments; FIG. 5 is a cross-sectional view showing another example of the lighting device according to the first to third embodiments;

Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its applicability or its uses.

(First embodiment)
FIG. 1 shows a perspective view of an illumination device according to this embodiment, FIG. 2 shows a cross-sectional view of the illumination device according to this embodiment, FIG. 3 shows an optical path in FIG. 2, and FIG. The top view of an illuminating device is shown, and FIG. 5 shows the front view of the illuminating device which concerns on this embodiment. In addition, in FIG. 3, the optical path in the lighting device is indicated by a dashed line.

The lighting device 100 is installed on the side of the road 51 and irradiates the road surface of the road 51 with light, as will be described later.

As shown in FIGS. 1 to 5, the illumination device 100 includes a light emitting element 1, a lens 2, a mirror 3, and a light blocking body 4. FIG. Light emitting element 1 , lens 2 and mirror 3 are arranged side by side in the optical axis direction of light emitting element 1 . In the following description, the Z direction indicates the vertical direction, the X direction indicates the horizontal direction (corresponding to the first direction), and the Y direction indicates the vertical direction perpendicular to the X and Y directions (corresponding to the second direction). . In the present embodiment, the illumination device 100 is installed so that the Z direction is the optical axis direction of the light emitting element 1, the X direction is the running direction of the road 51, and the Y direction is the width direction of the road 51, respectively.

The light emitting element 1 is a light emitting element such as an LED. The number of LEDs provided in the light emitting element 1 may be one or plural.

The lens 2 receives the light emitted from the light emitting element 1 and emits first emitted light to the mirror 3 . Specifically, the lens 2 has an entrance 21 , an exit 22 , and a side portion 23 provided between the entrance 21 and the exit 22 .

As shown in FIG. 2 , the entrance 21 is formed above the lens 2 in the drawing, and is formed in a concave shape so as to surround the light emitting element 1 . The incident port 21 is composed of a first incident surface 21a that is a concave bottom surface and a second incident surface 21b that is a concave side surface. Entrance 21 receives light emitted from light emitting element 1 through first entrance surface 21a and second entrance surface 21b.

Side portion 23 includes a first reflecting surface 23a, a second reflecting surface 23b, and a third reflecting surface 23c.

The first reflecting surface 23a is formed so as to expand in a curved surface shape from the upper end of the opening of the incident port 21 toward the lower side of the drawing. The first reflecting surface 23a reflects the light incident on the lens 2 from the entrance 21 toward the exit 22 or the second reflecting surface 23b.

The second reflecting surface 23b is formed so as to extend in a plane from the lower end of the exit port 22 upward in the drawing and in the Y direction. The second reflecting surface 23b reflects the light incident on the lens 2 from the entrance 21 toward the exit 22 side. In addition, the second reflecting surface 23b reflects the light reflected by the first reflecting surface 23a toward the exit port 22 side.

The third reflecting surface 23c, on the left side of the drawing of the lens 2, spreads in a curved shape from the upper end of the entrance 21 to the lower end of the exit 22, becomes flat from the middle, and is formed so as to spread in the Y direction. ing. The third reflecting surface 23c reflects the light incident on the lens 2 from the entrance 21 toward the exit 22 side.

The exit port 22 emits the light incident from the entrance port 21 to the mirror 3 . The shape of the exit port 22 is designed according to the light distribution shape to be projected. In the present embodiment, the exit port 22 is formed as a flat surface that is inclined with respect to the X direction (see FIG. 2, etc.). Due to the shape of the exit port 22, the light emitted from the exit port 22 can be refracted to the left side of the drawing, so that leakage light is suppressed and the illumination device 100 (specifically, the mirror 3) is located on the right side of the drawing. can reduce the size of

As shown in FIG. 3, the light ray R1 is incident on the first incident surface 21a of the incident port 21 and passes through the exit port 22 without passing through the first reflecting surface 23a and the second reflecting surface 23b. The light beam R2 enters the first incident surface 21a of the incident port 21, is reflected by the second reflecting surface 23b, and then passes through the exit port 22. As shown in FIG. The light ray R3 is incident on the second entrance surface 21b of the entrance 21, reflected by the second reflection surface 23b, and then passes through the exit 22. As shown in FIG. The light ray R4 enters the second incident surface 21b of the incident port 21, is reflected by the first reflecting surface 23a, is further reflected by the second reflecting surface 23b, and passes through the exit port 22. FIG.

In this manner, the first reflecting surface 23a reflects the light incident on the second incident surface 21b toward the exit port 22 or the second reflecting surface 23b. The second reflecting surface 23b reflects the light incident on the first incident surface 21a or the light reflected by the first reflecting surface 23a toward the exit port 22 side. Although the description is omitted, the third reflecting surface 23c reflects the light emitted from the light emitting element 1 to the left side of the drawing toward the exit port 22 side. The optical efficiency of the illumination device 100 can be enhanced by the first to third reflecting surfaces 23a to 23c.

As shown in FIG. 2, the mirror 3 is arranged below the lens 2 in the drawing. The mirror 3 has a reflecting surface 31 that reflects the light emitted from the exit 22 . The focal position of the reflecting surface 31 is set at the exit port 22 . Moreover, the reflecting surface 31 has such a curvature as to diffuse the light emitted from the lens 2 in the X direction and collimate it in the Y direction. For example, the shape of the reflecting surface 31 is formed such that two concave portions 31a and 31b are arranged in the X direction (see FIGS. 4 and 5). With this shape, the light emitted from the lens 2 can be concentrated in a narrow range in the Y direction and diffused in the X direction. The shape of the reflecting surface 31 is not limited to this, and may be any shape as long as the above curvature can be achieved. For example, the reflective surface 31 may have more than two concave portions, and the reflective surface 31 may be substantially planar.

The light shielding body 4 is composed of a light shielding member that shields incident light. As shown in FIG. 2, the light blocking member 4 is arranged on the lower right side of the second reflecting surface 23b of the lens 2. As shown in FIG. The light shielding member 4 shields the light that has passed through the second reflecting surface 23b (the light that has entered the second reflecting surface 23b and has not been reflected). By providing the light shielding body 4 in the lighting device 100, it is possible to suppress the light (stray light) transmitted through the second reflecting surface 23b from leaking out of the lighting device 100. FIG.

FIG. 6 is a diagram showing an arrangement relationship when the lighting devices according to the first embodiment are arranged on a road. Specifically, the illumination device 100 is arranged at a point 51a (about the same height as the line of sight of the driver of the vehicle 50) with a height of 1.2 m in the Z direction on the shoulder of the road 51 (roadway).

FIG. 7(a) shows an illuminance distribution map of the road surface in the lighting device according to this embodiment, and FIG. 7(b) shows a luminous intensity angle distribution map in the Y direction and Z direction in the lighting device according to this embodiment. In addition, in FIGS. 7A and 7B, the illuminance and portions with high luminosity are shown in white, and the portions with low luminosity and illuminance are shown in black.

In FIG. 7A, the vertical axis corresponds to the Y direction and the horizontal axis corresponds to the X direction. In FIG. 7A, the illumination device 100 is arranged at a point 51a in the lower center of the drawing.

As shown in FIG. 7A, the light is diffused over a wide range in the X direction, and all the lanes of the road 51 are illuminated in the Y direction. In addition, the illuminance of the area immediately below the lighting device 100 is suppressed, so that the surroundings of the lighting device 100 do not become too bright.

FIG. 7B is an angular luminous intensity distribution diagram when the direction of the lighting device 100 is viewed from the driver of the vehicle 50 traveling on the road 51, where the angle in the Z direction (elevation/depression angle V) The horizontal axis is the angle (horizontal angle H).

As shown in FIG. 7B, light is diffused over a wide range in the X direction. Also, it can be seen that there is a peak of luminous intensity below an angle of 0° in the Z direction, and the luminous intensity is suppressed in a region above 0°. Due to this light distribution, it is possible to suppress glare for the driver of the vehicle 50 . In the present embodiment, since the mirror 3 is arranged below the light emitting element 1 and the lens 2, it is possible to suppress leakage light to the upper part of the lighting device 100, thereby suppressing the occurrence of glare. .

With the above configuration, the illumination device 100 according to the present embodiment includes the light emitting element 1, the entrance 21 for receiving the light emitted from the light emitting element 1, and the exit 22 for exiting the light received by the entrance 21. and a mirror 3 that receives light from an exit port 22 and emits the light. The light emitting element 1, the lens 2 and the mirror 3 are arranged side by side in the Z direction (optical axis direction of the light emitting element). The mirror 3 emits light in the Y direction (direction different from the optical axis direction). With this configuration, since the lens 2 collects the light emitted from the light emitting element 1, the size of the mirror 3 can be suppressed. Also, by arranging the light emitting element 1, the lens 2 and the mirror 3 in the optical axis direction of the light emitting element 1, the size of the optical system can be reduced. Therefore, it is possible to irradiate light to a long distance while suppressing the size of the lighting device.

Also, the incident port 21 is formed in a concave shape so as to surround the light emitting element 1 . The incident port 21 has a first incident surface 21a that is a bottom surface and a second incident surface 21b that is a side surface. The first reflecting surface 23a of the lens 2 reflects the light incident on the second incident surface 21b toward the exit port 22 side. As a result, the optical efficiency of the lighting device can be increased, so that the lighting device can be miniaturized.

Further, the second reflecting surface 23b of the lens 2 reflects the light incident on the first incident surface 21a and the light reflected by the first reflecting surface 23a toward the exit port 22 side. As a result, the optical efficiency of the lighting device can be increased, so that the lighting device 100 can be miniaturized. As a result, the optical efficiency of the lighting device can be increased, so that the lighting device can be miniaturized.

Moreover, the light shielding member 4 shields the light transmitted through the second reflecting surface 23b. As a result, it is possible to suppress leakage of the light transmitted through the second reflecting surface 23 b to the outside of the illumination device 100 .

Also, the exit port 22 is inclined with respect to the X direction perpendicular to the Z direction. As a result, the light emitted from the exit port 22 can be refracted in the direction of the optical axis, so that leakage light can be suppressed and the size of the mirror 3 can be suppressed.

Also, the mirror 3 is arranged below the light emitting element 1 and the lens 2 . As a result, it is possible to suppress the leakage of light to the upper part of the lighting device 100, so that it is possible to suppress the generation of glare for the driver driving the vehicle.

The mirror 3 has its focal point set at the position of the exit port 22, and diffuses the light emitted from the lens 2 in the X direction (first direction) and collimates it in the Y direction (second direction). Let As a result, the light can be diffused over a wide area in the X direction (running direction) and concentrated in a narrow area in the Y direction (the width direction of the road 51).

Also, the mirror 3 has a shape in which the reflecting surface 31 has two concave portions 31a and 31b. As a result, it is possible to realize a light distribution in which the light is diffused over a wide range in the X direction (running direction) and concentrated in a narrow range in the Y direction (the width direction of the road 51).

(Second embodiment)
Fig.8 (a) shows the top view of the illuminating device which concerns on 2nd Embodiment, FIG.8(b) shows the front view of the illuminating device which concerns on 2nd Embodiment. In addition, in FIGS. 8A and 8B, the optical paths in the illumination device 100 are indicated by dashed lines. Moreover, in the second embodiment, the same reference numerals are given to the same configurations as in the first embodiment, and the description thereof is omitted.

In the second embodiment, multiple lenses 2 and multiple mirrors 3 are provided. As shown in FIGS. 8A and 8B, the mirror 3a is arranged on the left side of the drawing, the mirror 3b is arranged on the center of the drawing, and the mirror 3c is arranged on the right side of the drawing. Further, lenses 2a to 2c are provided so as to correspond to the mirrors 3a to 3c.

As shown in FIG. 8A, the mirror 3a is on the left side of the drawing (one side in the X direction), the mirror 3b is on the bottom side of the drawing (Y direction), and the mirror 3c is on the right side of the drawing (the other side in the X direction). illuminate each. As a result, the illumination device 100 can illuminate a wider range, and the number of illumination devices installed on the road 51 can be reduced. In addition, in FIGS. 8A and 8B, the three mirrors 3 may be integrated.

(Third embodiment)
FIG. 9 shows a cross-sectional view of the lighting device according to this embodiment. In addition, in FIG. 9, the optical path in the illumination device 100 is indicated by a broken line. In addition, in the third embodiment, the same reference numerals are assigned to the same configurations as in the first embodiment, and the description thereof is omitted.

In the third embodiment, the shape of the lens 2 is different from that in the first embodiment. Specifically, the side surface portion 23 is not provided with the second reflecting surface 23b. Even with the lighting device according to the third embodiment, it is possible to obtain the same effect as the lighting device according to the first embodiment.

Although not shown, light rays passing through the area corresponding to the second reflecting surface 23b are blocked by the light blocking member 4. As shown in FIG. As a result, it is possible to suppress light rays from the upper portion of the lighting device 100, thereby suppressing driver glare.

Also, as shown in FIG. 10, a mirror 6 (second mirror) may be arranged in a region corresponding to the second reflecting surface 23b. As a result, the mirror 6 reflects the light incident on the first incident surface 21a and the light reflected by the first reflecting surface 23a to the exit port 22 side in the same manner as the second reflecting surface 23b. The light utilization efficiency of the device can be improved.

(Other embodiments)
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which modifications, replacements, additions, omissions, etc. are made as appropriate.

In addition, in each of the above embodiments, the lens 7 may be arranged above the mirror 3 (see FIG. 11). By arranging the lens 7 above the mirror 3, the light emitted from the exit 22 can be collimated by the lens 7, so that the size of the illumination device 100 can be reduced.

In each of the above-described embodiments, the lighting device 100 is arranged so that the optical axis direction of the light emitting element 1 coincides with the Z direction (vertical direction). do not necessarily match. For example, the light emitting element 1, the lens 2, the mirror 3 and the light shield 4 may be arranged as shown in FIG. In FIG. 12 , the dashed line indicates the optical path in lighting device 100 , and the dashed arrow indicates the optical axis direction of light emitting element 1 . As shown in FIG. 12, even if the optical axis direction of the light emitting element 1 is inclined with respect to the Z direction, it is possible to achieve a light distribution similar to that of the illumination device 100 of each of the above embodiments. .

In each of the above-described embodiments, the lighting device 100 is used as a road lighting device, but the lighting device 100 may be used for purposes other than the road lighting device. For example, the illumination device 100 can be used in grounds and stadiums, and can also be used as headlights for vehicles.

INDUSTRIAL APPLICABILITY The lighting device of the present invention can be used as a road lighting device installed on the side of a road.

REFERENCE SIGNS LIST 100 lighting device 1 light emitting element 2 lens 3 mirror 4 light blocking body 6 mirror (second mirror)
7 lens 21 incident port 21a first incident surface 21b second incident surface 22 exit port 23a first reflecting surface 23b second reflecting surface

Claims (10)

a light emitting element;
a lens having an entrance for receiving light emitted from the light emitting element and an exit for emitting the light received by the entrance;
a mirror that receives light from the exit port and emits the light,
The light emitting element, the lens and the mirror are arranged side by side in the optical axis direction of the light emitting element,
The mirror emits light in a direction different from the optical axis direction,
The incident port is formed in a concave shape so as to surround the light emitting element, and is provided so that a first incident surface, which is a bottom surface thereof, faces the light emitting element in the optical axis direction,
The illumination device, wherein the lens further includes a first reflecting surface for reflecting light incident on a second incident surface, which is a side surface of the incident port, toward the exit port. The lighting device according to claim 1,
The illumination device, wherein the lens further includes a second reflecting surface that reflects light incident on the first incident surface and light reflected by the first reflecting surface to the exit side. The lighting device according to claim 2,
2. The lighting device according to claim 1, further comprising a light blocking body that blocks light transmitted through said second reflecting surface. The lighting device according to claim 3,
The lighting device further comprises a second mirror that reflects light incident on the first incident surface and light reflected by the first reflecting surface toward the exit side. In the lighting device according to any one of claims 1 to 4,
The illumination device, wherein the light exit is a plane inclined with respect to a plane perpendicular to the vertical direction. In the lighting device according to any one of claims 1 to 5,
A lighting device, wherein the direction of the optical axis is inclined with respect to the vertical direction. In the lighting device according to any one of claims 1 to 7,
The illumination device, wherein the mirror is arranged below the light emitting element and the lens. In the lighting device according to any one of claims 1 to 7,
The mirror diffuses the light emitted from the lens in a first direction perpendicular to the vertical direction, and collimates the light in the vertical direction and in a second direction perpendicular to the first direction. lighting device. In the lighting device according to any one of claims 1 to 8,
The illumination device, wherein the mirror has a reflecting surface with two concave portions. In the lighting device according to any one of claims 1 to 9,
The illumination device, wherein the light emitting element is composed of a plurality of LEDs.

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