JP2021072242A - Illumination device - Google Patents

Abstract

To provide an illumination device which can illuminate a wide range in a running direction and reduce glare.SOLUTION: An illumination device which illuminates a road with illumination light extending in a running direction A of a road, includes an optical member 60 having a tabular base plate 80 through which the illumination light transmits. The base plate 80 is provided, in an incidence plane 80B in a side thereof in which the illumination light comes, with a plurality of convex incidence plane protrusions 84 which emits the illumination light entering thereto, from an emission plane 80A of the base plate 80 in a wide angle direction.SELECTED DRAWING: Figure 17

Description

The present invention relates to a lighting fixture.

As road luminaires that illuminate roads, in addition to luminaires that are supported by columns and illuminate the road surface from a high place, low-position road luminaires that illuminate the road surface from a relatively low position beside the road are known ( For example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-192299

Since the low-position road luminaire is installed near the driver who drives the vehicle, the driver is likely to feel glare. The glare problem becomes more pronounced, especially when illuminating a large area in the direction of travel of the road.

An object of the present invention is to provide a luminaire capable of reducing glare while illuminating a wide range in a traveling direction.

The present invention comprises an optical member having a plate-shaped base plate that transmits the illumination light in a lighting fixture that illuminates the road with illumination light extending in the traveling direction of the road, and the base plate is provided with the illumination light. The incident surface on the incident side is provided with a plurality of convex incident surface convex portions that emit light incident on the incident surface from the exit surface of the base plate in the wide angle direction.

The present invention is characterized in that, in the luminaire, each of the incident surface convex portions incidents light incident on the incident surface on the exit surface of the base plate at an angle that does not cause total reflection.

According to the present invention, in the luminaire, the base plate has a plurality of convex exit surface protrusions that totally reflect the light incident on the exit surface on the side where the illumination light is emitted and emit the light in the wide angle direction. It is characterized in that a part is provided.

The present invention is characterized in that, in the luminaire, each of the light emitting surface convex portions is arranged in the traveling direction at an arrangement interval in which the totally reflected light is not incident on the adjacent light emitting surface convex portion. ..

According to the present invention, glare can be reduced while illuminating a wide range in the traveling direction.

It is a perspective view which shows the structure of the low-position road lighting fixture which concerns on embodiment of this invention. It is a figure which shows the internal structure of the low-position road lighting fixture, and is the front view which shows the state which the front cover and the front light shielding plate of the fixture are removed. It is a perspective view which shows the light source unit for roadside band lighting in the main body case in an enlarged manner. It is a perspective view which shows the light source unit for roadside band lighting in the main body case in an enlarged manner. It is a figure which shows the cross-sectional structure of the light source unit for roadside band illumination in a main body case. It is sectional drawing of the light source unit for road surface illumination in the main body case. It is a perspective view of the light source unit for road surface lighting seen from the front side. It is a perspective view of the light source unit for road surface lighting as seen from the rear side. It is a perspective view which shows the state which the plate-shaped optical member was removed in the light source unit for road surface illumination of FIG. It is a cross-sectional view of the parallel light lens for road surface illumination. It is a figure which shows the relationship between the incident angle of the main ray when the ray of ± 20 degrees is incident on the first incident surface, and the emission angle width after refraction. It is a figure which shows the relationship between the incident angle of the main ray when the ray of ± 11 degree is incident on the exit surface, and the emission angle width at the time of emission. It is a perspective view which shows the structure of the plate-shaped optical member, (A) shows the front side, (B) shows the back side. It is a top view of the plate-shaped optical member as seen from the front. It is a vertical sectional view of a plate-shaped optical member. It is a figure which shows the change of the brightness distribution when the radiation opening by a base plate is seen from the outside of an instrument. It is an enlarged view which shows the cross-sectional structure of the incident surface convex part in the vertical cross section of a base plate. It is an enlarged view which shows the cross-sectional structure of the incident surface convex part in the vertical cross section of a base plate. It is an enlarged view which shows the cross-sectional structure of the incident surface convex part in the vertical cross section of a base plate. It is an enlarged view which shows the cross-sectional structure of the convex part of the exit surface in the vertical cross section of a base plate. It is a figure which shows the cross-sectional shape of the base plate in 1st range 1st section to 1st range 3rd section, and 2nd range 1st section to 2nd range 2nd section. It is a perspective view which shows the modification of the plate-shaped optical member. It is a figure which shows the other modification of the plate-shaped optical member, (A) is a perspective view, (B) is a vertical sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of a low-position road lighting fixture 1 according to the present embodiment.
The low-position road lighting fixture 1 is installed on a structure (sound insulation wall, bridge, etc.) provided on the side of the road at substantially the same height as the line of sight of the driver of the vehicle traveling on the road (for example, around 1 to 1.2 meters). It is a device that illuminates the road surface from the installation position. As shown in FIG. 1, the low-position road lighting fixture 1 includes a rectangular parallelepiped fixture main body 2 extending in the traveling direction A of the road, and the fixture is in a posture in which the front 2F of the fixture main body 2 is directed toward the road side. Both ends of the main body 2 are fixed to the structure by fixing brackets 4. The fixing brackets 4 at both ends support the instrument body 2 so as to be tiltable with respect to the road surface, so that the mounting angle of the instrument body 2 in the vertical direction can be adjusted. Further, at least one of the side surfaces of both ends of the appliance main body 2 (only the left side surface in FIG. 1 in the present embodiment) is provided with a line-of-sight guidance light emitting unit 14 that emits light for guiding the line of sight of the driver of the vehicle. The line-of-sight guidance light emitting unit 14 is exposed from the light emitting window 5 formed on each fixing metal fitting 4, so that the driver of the vehicle can see it.

As shown in FIG. 1, the instrument main body 2 includes a rectangular parallelepiped metal main body case 6 having an open front surface (for example, an aluminum alloy or the like), and the front opening 6A is a substantially rectangular shape hinged to the main body case 6. It is closed by the shaped front cover 8. The front cover 8 is a rectangular plate material made of a transparent material such as glass or resin, and is attached to the main body case 6 with the waterproof packing 7 interposed therebetween.

In the present embodiment, on the back surface of the front cover 8 (the surface facing the inside of the main body case 6), the fixture front light-shielding plate 9 having a size covering the entire surface is arranged, and within the surface of the fixture front light-shielding plate 9. Is formed with two road surface illumination light openings 10 and one roadside band illumination light opening 12.
The road surface illumination light opening 10 is an opening for passing the illumination light Kb (FIG. 6) that illuminates the road surface from the inside of the appliance main body 2 to the outside, and the roadside zone illumination light opening 12 is a roadside zone of the road (FIG. 6). This is an opening for passing the illumination light Ka (FIG. 5) that illuminates the outside line of the roadway from the inside to the outside of the fixture main body 2. Both the road surface illumination light opening 10 and the roadside band illumination light opening 12 form a rectangular shape extending along the traveling direction A of the road, so that a wide range along the traveling direction A can be illuminated by the illumination light. In the plane of the front cover 8, these are arranged side by side at appropriate intervals along the traveling direction A.

By providing the light-shielding plate 9 on the front of the fixture, the emission of leaked light is suppressed. Further, both the front and back surfaces of the fixture front shading plate 9 are coated with a coating that suppresses light reflection (for example, matte black coating), and on the back surface side, stray light due to the light component shielded inside the fixture body 2 is applied. On the surface side, reflection of vehicle headlights and the like is prevented.

FIG. 2 is a view showing the internal configuration of the low-position road lighting fixture 1, and is a front view showing a state in which the front cover 8 and the fixture front light-shielding plate 9 are removed.
As shown in the figure, two road surface lighting light source units 20, one roadside band lighting light source unit 22, a power terminal block 24, and a power box 26 are housed inside the fixture main body 2. There is.
The road surface illumination light source unit 20 is a light source unit that illuminates the road surface by emitting illumination light Kb extending in the traveling direction A from the road surface illumination light opening 10, and the roadside band illumination light source unit 22 extends in the traveling direction A. This is a light source unit that illuminates the roadside band by emitting the illumination light Ka from the roadside band illumination light opening 12. The road surface illumination light source unit 20 and the roadside band illumination light source unit 22 are arranged inside the main body case 6 so as to face each of the road surface illumination light opening 10 and the roadside band illumination light opening 12.

The power supply terminal block 24 is a terminal block for connecting the power line of the commercial power source drawn from the outside of the appliance main body 2 and the wiring of the power supply box 26. The power supply box 26 is a device that generates DC power for lighting the road surface illumination light source unit 20 and the roadside band illumination light source unit 22, and has a built-in AC-DC converter and is a commercial AC power supplied from the outside. To DC power. The power supply box 26 may change the DC power (for example, DC current) based on a dimming instruction from the outside, and may change the amount of light of the road surface illumination light source unit 20 and the roadside band illumination light source unit 22. .. Further, the main body case 6 may have a built-in battery as emergency power used in the event of a power failure or the like.

3 and 4 are enlarged perspective views showing the roadside band lighting light source unit 22 in the main body case 6, and FIG. 5 is a view showing a cross-sectional configuration of the roadside band lighting light source unit 22 in the main body case 6. Is. Note that FIG. 4 is a diagram in which the screw 41 for fixing the roadside band illumination light source unit 22 is omitted in FIG. Further, the cross section shown in FIG. 5 shows a plane (hereinafter, referred to as “cross section”) perpendicular to the longitudinal direction (that is, the traveling direction A) of the instrument main body 2.
As shown in FIG. 5, the roadside band lighting light source unit 22 includes a roadside band lighting LED light source 30 using an LED as an example of a light emitting element as a light source, a roadside band lighting reflector 32, and a roadside band lighting support. 34, a front light-shielding plate 36 for roadside band lighting, and a side light-shielding plate 38 for roadside band lighting (FIG. 3) are provided.
The roadside band illumination LED light source 30 includes a rectangular LED substrate 39 extending in the traveling direction A, and a plurality of LEDs 40 arranged in a line in the traveling direction A on the mounting surface of the LED substrate 39. , A so-called linear light source that emits light extending in the traveling direction A. In the present embodiment, a substrate in which SMD light source elements are arranged in a line is used as the linear light source, but the present invention is not limited to this, and a COB in which chips of the light source element are integrated in a long rectangular shape in one direction is used. You may.

The roadside band illumination reflector 32 includes a roadside band illumination control reflector 32A that extends in the traveling direction A and faces the roadside band illumination LED light source 30. The roadside zone illumination control reflection surface 32A is arranged to face the roadside zone illumination light opening 12, reflects the line-shaped light of the roadside zone illumination LED light source 30, and passes through the roadside zone illumination light opening 12 to roadside the roadside zone. Light distribution to. As the base material of the roadside band illumination reflector 32, an appropriate material such as a metal such as aluminum or a resin obtained by vapor-depositing aluminum is used.

As shown in FIG. 5, the roadside band lighting support 34 is used for roadside band lighting so that the roadside band lighting LED light source 30 is located vertically above the roadside band lighting control reflecting surface 32A in the cross section. It is a member that supports the LED light source 30 and the roadside band illumination reflector 32 in the main body case 6. By arranging the roadside band illumination control reflection surface 32A and the roadside band illumination LED light source 30 in the vertical direction, the depth dimension W of the main body case 6 can be suppressed.
By suppressing the depth dimension W, even if there is a limitation on the relationship between the mounting position of the low-position road luminaire 1 and the road surface, it becomes easy to apply the limitation.

As shown in FIG. 5, the roadside band lighting front shading plate 36 is provided on the front 2F side (that is, the road side) of the fixture main body 2 with respect to the roadside band lighting LED light source 30, and as shown in FIG. It is a plate material having a shape extending in the direction A. The roadside band illumination front shading plate 36 blocks the light component of the roadside band illumination LED light source 30 that goes in the front direction without incident on the roadside band illumination control reflecting surface 32A. As a result, unnecessary leakage light emitted without control can be suppressed from the horizontal direction to the downward direction.

As shown in FIG. 5, a bent portion 36A formed by being bent in an L shape toward the back surface 2B of the instrument main body 2 is provided at the lower end of the front light shielding plate 36 for roadside band lighting, and the bent portion 36A is provided. The portion 36A ensures that the light emitted downward from the roadside band illumination LED light source 30 through the roadside band illumination light opening 12 without incident on the roadside band illumination control reflection surface 32A is cut.

Further, as shown in FIG. 3, side shading plates 38 for roadside band lighting are provided at both ends of the roadside band lighting light source unit 22 in the traveling direction A, and are provided inside the main body case 6 from the roadside band lighting LED light source 30. The light leaking in the traveling direction A is blocked. As a result, it is possible to prevent the leaked light from the roadside band lighting light source unit 22 toward the traveling direction A from becoming a glare source for the driver or becoming a stray light.

By providing the front light-shielding plate 36 for roadside band lighting, the bent portion 36A, and the side light-shielding plate 38 for roadside band lighting, leakage light is suppressed and only the light component whose reflection is controlled by the roadside band lighting control reflection surface 32A. Can be emitted to illuminate the roadside zone in a line-like manner.

As shown in FIG. 3, in the roadside band lighting light source unit 22, each of the side shading plates 38 for roadside band lighting on both sides is attached to a pair of mounting plates 37 vertically erected on the base plate 11 of the main body case 6. , Is fixed with screws 41. As shown in FIG. 4, each mounting plate 37 is provided with screw holes 43A and 43B at two upper and lower positions, and one of the screw holes 43B (upper side in the present embodiment) is an elongated hole. There is. As a result, the roadside band lighting light source unit 22 becomes rotatable around the other screw hole 43A as a rotation axis, and when the roadside band lighting light source unit 22 is screwed, or the low-position road lighting fixture 1 is placed on site. When installing, the mounting angle of the roadside band lighting light source unit 22 can be finely adjusted.

Next, the light source unit 20 for road surface illumination will be described in detail.
FIG. 6 is a cross-sectional view of the road surface lighting light source unit 20 in the main body case 6. FIG. 7 is a perspective view of the road surface illumination light source unit 20 as viewed from the front side, and FIG. 8 is a perspective view of the road surface illumination light source unit 20 as viewed from the rear side. FIG. 9 is a perspective view showing a state in which the plate-shaped optical member 60 is removed from the road surface illumination light source unit 20 of FIG. Note that FIG. 8 omits the illustration of the road surface lighting support 56.

As shown in FIG. 6, the road surface illumination light source unit 20 includes a road surface illumination LED light source 50 using an LED as an example of a light emitting element as a light source, a road surface illumination parallel lightening lens 52, and a road surface illumination reflector 54. A support 56 for road surface illumination, a front light-shielding plate 58 for road surface illumination, a side light-shielding plate 59 for road surface illumination (FIG. 7), and a plate-shaped optical member 60 are provided. Further, as shown in FIG. 7, the road surface illumination light source unit 20 is formed in the traveling direction A by the road surface illumination reflector 54, the road surface illumination front light-shielding plate 58, and the road surface illumination side light-shielding plates 59 at both ends. It has a radiation opening 64 that is partitioned in a substantially rectangular shape in the front view, and emits illumination light Kb that extends in the traveling direction A from the radiation opening 64. The radiation opening 64 is covered with the plate-shaped optical member 60 in order to suppress glare to the driver.

In the fixture body 2, as described above, the fixture front shading plate 9 is arranged between the road surface lighting light source unit 20 and the front cover 8, and the radiation opening 64 of the road surface lighting light source unit 20 is the fixture front shading plate. It is arranged to face the road surface illumination light opening 10 of 9. By providing the light-shielding plate 9 on the front of the fixture, unintended leakage light generated inside the fixture body 2 is reduced, and a luminous flux that becomes unnecessary leakage light upward from the fixture body 2 (hereinafter, "upper luminous flux"). The luminous flux (hereinafter referred to as "luminous flux directly below"), which is unnecessary leakage light from the fixture main body 2 to the shoulder of the road facing directly downward, is suppressed.

Next, each part of the light source unit 20 for road surface illumination will be described in detail.
As shown in FIG. 6, the LED light source 50 for road surface illumination includes an LED substrate 61 and an LED 62 mounted on a mounting surface of the LED substrate 61. As shown in FIG. 8, the LED substrate 61 has a rectangular shape extending in the traveling direction A, and a plurality of LEDs 62, each of which forms a light spot, are arranged in a line in the traveling direction A on the LED substrate 61. It is configured as a so-called linear light source arranged, and the LED light source 50 for road surface illumination emits light extending in the traveling direction A. In the present embodiment, a substrate in which SMD light source elements are arranged in a line is used as the linear light source, but the present invention is not limited to this, and a COB in which chips of the light source element are integrated in a long rectangular shape in one direction is used. You may.

The parallel lightening lens 52 for road surface illumination is provided between the LED light source 50 for road surface illumination and the reflector 54 for road surface illumination, forms a columnar shape extending in the traveling direction A, and is used for road surface illumination. It is a transmissive optical element that parallelizes the radiated light of the LED light source 50 and incidents on the road surface illumination reflector 54.

As shown in FIG. 8, the road surface illumination reflector 54 is a plate-shaped member extending in the traveling direction A, and as shown in FIG. 6, the road surface illumination facing the road surface illumination LED light source 50 is on the inner surface thereof. A control reflection surface 54A is formed. In the cross section of the instrument main body 2, the road surface illumination control reflection surface 54A is arranged to face the road surface illumination light opening 10 and reflects the light extending in the traveling direction A emitted by the road surface illumination LED light source 50 to illuminate the road surface. Light is distributed to the road surface through the light opening 10. As the base material of the road surface illumination reflector 54, an appropriate material such as a metal such as aluminum or a resin obtained by thin-filming aluminum is used.

The road surface illumination support 56 is a member that supports the road surface illumination LED light source 50, the road surface illumination parallel lightening lens 52, and the road surface illumination reflector 54 in the main body case 6, and the surface thereof is a member. , A paint that suppresses the reflection of light is applied, and the generation of stray light due to the reflection on the road surface lighting support 56 is suppressed. As shown in FIG. 6, the road surface illumination support 56 has a light source mounting surface 57 to which an LED light source 50 for road surface illumination and a parallel lightening lens 52 for road surface illumination are mounted, and the light source mounting surface 57 has a light source mounting surface 57. A reflector 54 for road surface illumination is supported above the reflector.
Therefore, the light of the parallel lightening lens 52 for road surface illumination is incident on the road surface illumination control reflection surface 54A of the road surface illumination reflection plate 54, and the road surface illumination control reflection surface 54A directs the light to the road below. Reflects toward the road surface.
As a result, the road surface illumination reflector 54 reflects the light incident from below toward the lower road surface, so that the upward light is surely reflected by the road surface illumination reflector 54, and the upward luminous flux becomes leakage light. Can be suppressed.
Further, since the light of the LED light source 50 for road surface illumination is radiated upward through the parallel lightening lens 52 for road surface illumination, it is possible to suppress the above-mentioned direct light flux, which is the light leaking downward to the road shoulder. it can.

As shown in FIG. 6, the road surface illumination control reflection surface 54A has an inclined surface 54AS formed by being bent downward at the tip end portion on the front 2F side of the instrument main body 2 in the cross section. The surface 54AS reflects the light incident on the surface 54AS to the back surface 2B side (the side opposite to the road side). As a result, the upward luminous flux that becomes the leaked light is suppressed.

Further, in the road surface illumination control reflection surface 54A, the portion other than the inclined surface 54AS at the tip portion (at least the range facing the parallel lightening lens 52 for road surface illumination) is vertical in the normal direction B as shown in FIG. The angle α is formed on a surface of 0 degrees or more and 90 degrees or less. The road surface illumination control reflecting surface 54A reflects light incident from below the road surface illumination control reflecting surface 54A, thereby reducing the upward luminous flux which becomes leakage light, and has a sharp peak mainly in the range of 75 degrees to 90 degrees at a vertical angle. Moreover, an illumination light Kb that efficiently illuminates the entire road surface can be obtained.

In the present embodiment, the light emitted from the parallel lightening lens 52 for road surface illumination is not completely parallel light but has a slight spread, and the road surface illumination control reflection surface 54A distributes light due to this spread. In order to cancel out the error, the cross section is formed of a plurality of (three in the present embodiment) planes 55K (FIG. 8) having different vertical angles α. The road surface illumination control reflection surface 54A may have a curved surface shape in a cross-sectional view.

As shown in FIG. 6, the front light-shielding plate 58 for road surface illumination extends upward from the end portion 57T on the front 2F side of the light source mounting surface 57 in the cross section of the instrument main body 2, and as shown in FIG. 9, the road surface It is a plate material that covers substantially the entire range of the front 2F side (the side of the front cover 8) of the parallel light lens 52 for illumination. The road surface illumination front shading plate 58 cuts stray light from the road surface illumination parallel light lens 52 toward the front side.
Further, in the front light shielding plate 58 for road surface illumination, the upper end 58U on the front 2F side is closer to the road surface illumination parallel light lens 52 with respect to the front cover 8 than the end portion 57T on the front 2F side of the light source mounting surface 57. It is formed on an inclined surface that is bent so as to be located, and the above-mentioned upward luminous flux that becomes leakage light is suppressed.
The front light-shielding plate 58 for road surface illumination may be coated on the surface facing the parallel lightening lens 52 for road surface illumination to suppress light reflection (for example, matte black coating).

As shown in FIGS. 7 to 9, the road surface illumination side shading plates 59 are provided at both ends of the road surface illumination light source unit 20 in the traveling direction A, and travel from the road surface illumination LED light source 50 inside the main body case 6. The light leaking in the direction A is blocked. Further, the inner surface of the side light-shielding plates 59 for road surface illumination at both ends is coated with a coating (for example, matte black coating) for suppressing light reflection. As a result, it is possible to prevent the reflected light from the side light-shielding plate 59 for road surface illumination from becoming a glare source or stray light for the driver.

Here, in the road surface illumination light source unit 20 of the present embodiment, the light source mounting surface 57 of the road surface illumination support 56 is the road surface illumination light opening 10 in the cross section of the instrument main body 2 as shown in FIG. By being provided below the height position Hb of the lower edge 10B, the height Ha of the road surface illumination LED light source 50 (LED62) is set to the height position Hb of the lower edge 10B of the road surface illumination light opening 10 and the height position Hb of the lower edge 10B. The height position Hc at the upper end of the front light-shielding plate 58 for road surface illumination is lower than the height position Hc, which suppresses the direct light source which becomes the leakage light.

Further, the light source mounting surface 57 is formed on an inclined surface inclined at an inclination angle β on the back surface 2B side of the instrument main body 2 with respect to the horizontal plane Ph, so that the optical axis Fa of the LED light source 50 for road surface illumination is vertically above. It is tilted toward the back surface 2B side (opposite side to the road side), and the direct light source and the upward light source, which are leaking light, are more reliably suppressed.

Next, the parallel lightening lens 52 for road surface illumination will be described in detail.
As described above, the road surface illumination parallel lightening lens 52 parallelizes the emitted light (incident light) emitted by the road surface illumination LED light source 50 in the traveling direction A in the cross section of the instrument main body 2 and causes the incident light. It is a transmissive optical element that extends in the same direction as the light and emits collimated light in the cross section of the instrument body 2, and as shown in FIG. 6, the back surface 2B of the cross section of the instrument body 2 It has a function of changing the direction of the emission optical axis of the road surface illumination LED light source 50 facing the side so as to approach vertically upward and emitting light toward the road surface illumination control reflection surface 54A arranged above the road surface illumination control reflection surface 54A.
The parallel lightening lens 52 for road surface illumination changes the direction of the light of the LED light source 50 for road surface illumination so as to approach vertically upward, so that the road surface illumination control reflection surface 54A is the device main body 2 as compared with the configuration in which the direction is not changed. Since it can be moved closer to the front 2F side, the depth dimension W of the main body case 6 can be suppressed, and the road surface lighting light source unit 20 can be housed in the housing within the specified dimensions.

FIG. 10 is a cross-sectional view of the parallel lightening lens 52 for road surface illumination.
As shown in the figure, the parallel lightening lens 52 for road surface illumination has a substantially rectangular shape in cross-sectional view, and is opposed to each of the front side and the back side with the optical axis L of the emitted light interposed therebetween. A side surface 73 and a second outer surface 74 are provided. Further, the parallel lightening lens 52 for road surface illumination has an incident surface 70 formed at the bottom thereof to which incident light from the LED light source 50 for road surface illumination is incident, and emits emitted light obtained by parallelizing the incident light at the upper portion. The exit surface 72 is formed. The exit surface 72 is formed on a plane perpendicular to the optical axis L.

As shown in FIG. 6 above, the parallel light lens 52 for road surface illumination is provided so that the optical axis L is inclined so as to face the back surface 2B side of the instrument main body 2 in the cross section, so that the exit surface 72 is inclined. Is provided. As a result, the depth dimension W of the main body case 6 can be suppressed as compared with the case where the exit surface 72 is arranged horizontally.

As shown in FIG. 10, the parallel lightening lens 52 for road surface illumination determines the traveling direction (optical axis Fa) of the incident light incident on the incident surface 70 in the direction of approaching the front 2F side (road side) inside. The light is made parallel by changing the angle γ, and the light is emitted substantially vertically from the exit surface 72.
In general, in refraction on the exit surface of a lens, the smaller the incident angle of a light ray from the inside of the lens to the exit surface (the angle formed by the normal of the exit surface and the ray), the width of the exit angle of the emitted light with respect to the width of the incident angle. (Expansion angle) can be kept small. In the parallel lightening lens 52 for road surface illumination of the present embodiment, the light parallelized in parallel inside the lens is incident on the exit surface 72 perpendicularly and emitted from the exit surface 72, so that the light spreads on the exit surface 72. Suppressed parallel light can be obtained.

Here, in the cross section of the parallel lightening lens 52 for road surface illumination of the present embodiment, the optical action for parallelizing the incident light is different between the front side and the back side. That is, the parallel lightening lens 52 for road surface illumination parallelizes the incident light on the front side (hereinafter, referred to as "first parallel lightening unit P1") by the refractive action of the convex lens, and collimates the incident light on the back side (hereinafter, "second"). In the parallel lightening section P2 ”), the incident light is parallelized by the reflecting action of all the reflecting surfaces.

Specifically, on the incident surface 70, at least in the range corresponding to the first parallel lightening unit P1 and at least in the range where the radiated light of the road surface illumination LED light source 50 can be incident, the light emitting surface 72 is formed on a flat surface. A convex surface 70P1 forming a plano-convex lens is formed between them. In the first parallel lightening unit P1, the incident light is parallelized by the plano-convex lens and emitted from the exit surface 72.
On the other hand, in the parallel lightening lens 52 for road surface illumination, the second outer surface 74 corresponding to the second parallel lightening unit P2 is formed as a parabolic total reflection surface. By the second outer surface 74 of the total reflection surface, the light rays incident from the portion corresponding to the second parallel lightening portion P2 of the incident surface 70 are totally reflected in the optical axis L direction and emitted as parallel light. It is emitted from the surface 72.

As described above, in the parallel lightening lens 52 for road surface illumination, the back surface side is a second parallel lightening unit P2 that makes the incident light parallel light by the reflection action of the total reflection surface. In this way, by combining the first parallel lightening unit P1 that produces parallel light by refraction and the second parallel lightening unit P2 that produces parallel light by the total reflection surface, the emission optical axis of the conventional LED can be increased. A more compact configuration can be realized as compared with a configuration using a collimated optical system in which LEDs are arranged so as to coincide with the optical axis L. Further, the LED light source 50 for road surface illumination and the parallel lightening lens 52 for road surface illumination can be arranged so that the LED emission optical axis is obliquely oriented in the direction opposite to the road side, and the optical system is arranged in the instrument main body 2. Sometimes the width in the cross section (width in the depth direction of the main body case 6) can be suppressed to make it compact.
Of the exit surface 72, a part or all of the range corresponding to the first parallel lightening portion P1 may be a convex curved surface to further increase the parallelism of the parallel light emitted from the exit surface 72.

Further, in the parallel lightening lens 52 for road surface illumination of the present embodiment, the first outer surface 73 of the first parallel lightening unit P1 totally reflects the light incident therein toward the light axis L side in the cross section. It is formed on the total internal reflection surface, so that leakage of light is suppressed and lighting efficiency is improved. The reflection angle at the time of total reflection is set to an angle at which the reflected light does not enter the front cover 8 and is incident on the above-mentioned road surface illumination control reflection surface 54A above the parallel lightening lens 52 for road surface illumination. , Leakage of light outside the controlled irradiation range is suppressed.

As described above, the parallel lightening lens 52 for road surface illumination is incident because the first parallel lightening unit P1 and the second parallel lightening unit P2 have different optical actions for parallel lightening. Also on the surface 70, as shown in FIG. 10, the first parallel lightening portion P1 and the second parallel lightening portion P2 are formed in different shapes (that is, asymmetrical about the optical axis Fa). Specifically, on the incident surface 70, the above-mentioned convex surface 70P1 is formed at a portion corresponding to the first parallel lightening portion P1, whereas the above-mentioned convex surface 70P1 corresponds to the second parallel lightening portion P2. Three surfaces, a first incident surface 70P2-1, a second incident surface 70P2-2, and a third incident surface P2-3, are provided at the locations in order from the side closer to the optical axis Fa of the incident light.

The first incident surface 70P2-1 is a component of the light rays emitted by the LED 62 that is relatively close to the optical axis Fa, that is, a light component having a relatively large amount of light in the luminous flux (so-called volume zone of the light rays of the LED 62). Is the plane on which. The light rays incident on the first incident surface 70P2-1 are formed into a group of light rays having a predetermined angular width range δa with respect to the main light rays Sk from the light source center 62A of the LED 62 due to the width of the LED 62. In the form, the angle width range δa is about ± 20 degrees. It is desirable that the emission angle width εa after refraction of the light beam incident on the first incident surface 70P2-1 is as small as possible for parallel light.

FIG. 11 is a diagram showing the relationship between the incident angle of the main ray Sk when a light ray of ± 20 degrees is incident on the first incident surface 70P2-1 and the exit angle width εa after refraction. The figure shows a case where the parallel lightening lens 52 for road surface illumination is formed from an acrylic transparent material having a refractive index of 1.49.
As shown in the figure, the larger the incident angle of the main ray Sk, the smaller the exit angle width εa after refraction. However, as the incident angle increases, Fresnel reflection at the time of incidence on the first incident surface 70P2-1 also increases and the loss increases. Therefore, in the present embodiment, the incident angle is about 40 degrees and the exit angle width εa after refraction is about 22 degrees so that the exit angle width εa after refraction is small while suppressing the increase in Fresnel reflection. First incident surface 70P2-1 is designed. As a result of such a design, the first incident surface 70P2-1 is an inclined surface that is inclined at about 45 degrees with respect to the optical axis Fa of the incident light in the cross section.

The light beam incident on the first incident surface 70P2-1 and having an emission angle width εa is totally reflected by the second outer surface 74 and is incident on the exit surface 72. The incident light beam incident on the emission point 72A in the emission surface 72 is a group of light rays having an angle width range δb with respect to the main ray Sj of the incident light ray, and this angle width range δb is approximately the same as the emission angle width εa. Match. Then, the second outer surface 74 totally reflects light rays so as to be incident on the exit surface 72 at an incident angle that minimizes the emission angle width εb at the time of emission from the emission surface 72.

FIG. 12 is a diagram showing the relationship between the incident angle of the main ray Sj when a light ray of ± 11 degrees is incident on the exit surface 72 and the emission angle width εb at the time of emission. The figure shows a case where the parallel lightening lens 52 for road surface illumination is formed from an acrylic transparent material having a refractive index of 1.49.
As shown in the figure, the emission angle width εb at the time of emission increases as the incident angle of the main ray Sj increases. Therefore, in the present embodiment, in order to set the exit angle width εb at the time of emission to the minimum angle width (about 34 degrees in the present embodiment), the main light beam totally reflected on the second outer surface 74 is applied to the exit surface 72. It is designed so that the incident angle at the time of incidence is "0 degrees".

As described above, in the second parallel lightening unit P2, the first incident surface 70P2-1 sets the emission angle width εa of the light rays incident therein after refraction to be larger than the angle width range δa of the light rays at the time of incidence. The light rays are totally reflected so that the second outer surface 74 is made small and is incident on the exit surface 72 at an incident angle that minimizes the exit angle width εb at the time of emission from the exit surface 72.
As a result, the emission angle width εb of the light beam emitted from the emission surface 72 is suppressed, and the parallelism of the light emitted from the second parallel lightening unit P2 is increased.

The second incident surface P2-2 is a portion connecting the first incident surface P2-1 and the third incident surface P2-3, and is formed by a convex surface protruding toward the LED 62 in the cross section.
The third incident surface P2-3 is a surface on which the light component on the outermost peripheral side of the luminous flux of the synchrotron radiation of the road surface illumination LED light source 50 is incident, and is more incident than the first incident surface 70P2-1 in the cross section. It is tilted at a large angle with respect to the optical axis Fa of light. Therefore, on the third incident surface P2-3, the light rays incident on the third incident surface P2-3 are refracted toward the optical axis L at a larger refraction angle than the first incident surface 70P2-1, and are totally reflected by the second outer surface 74. It is emitted from the exit surface 72 as parallel light. This enhances the efficiency of light utilization.

Next, the plate-shaped optical member 60 will be described in detail.
13 is a perspective view showing the configuration of the plate-shaped optical member 60, FIG. 13A shows the front side, and FIG. 13B shows the back side. 14 is a plan view of the plate-shaped optical member 60 as viewed from the front, and FIG. 15 is a vertical cross-sectional view of the plate-shaped optical member 60.
The plate-shaped optical member 60 is an optical member for covering the radiation opening 64 of the illumination light Kb that illuminates the road surface in the light source unit 20 for road surface illumination (FIG. 7) and suppresses glare, and extends in the traveling direction A. A base plate 80 having a predetermined thickness (for example, 2 mm) made of a rectangular translucent material is provided. Locking pieces 81 are integrally formed at both ends of the base plate 80, and these locking pieces 81 are screwed and fixed to the road surface lighting side shading plate 59 of the road surface lighting light source unit 20.

FIG. 16 is a diagram showing changes in the brightness distribution when the radiation opening 64 by the base plate 80 is viewed from the outside of the fixture.
In the road surface illumination light source unit 20, each LED 62 of the road surface illumination LED light source 50 is projected on the road surface illumination control reflection surface 54A, and as shown in the figure, the base plate 80 is formed in the radiation opening 64 of the road surface illumination light source unit 20. When is not provided, the light emitting points of the individual LEDs 62 arranged vertically and horizontally can be clearly seen in the front view. On the other hand, in the perspective view, the light source unit 20 for road surface illumination does not emit light in an oblique direction, so that it looks dark.

On the other hand, when the base plate 80 is provided, in front view, the light emitting points of the individual LEDs 62 extend so as to be continuous in the traveling direction A, and lines having lower brightness than the others (hereinafter referred to as “dark lines”) are vertically striped. Looks like it's in. As a result, the apparent light source area is widened and the concentration of brightness is alleviated, so that the glare of the road surface illumination light source unit 20 is reduced.

As the configuration of the base plate 80, first, the configuration of the incident surface 80B, which is the surface on the side where the light is incident (back surface side), will be described in detail.
As shown in FIG. 13B above, the incident surface 80B is formed with a large number of incident surface convex portions 84 for emitting incident light in the wide-angle direction. These incident surface convex portions 84 are formed side by side in the traveling direction A, and each incident surface convex portion 84 is formed in a direction perpendicular to the traveling direction A in a plan view of the back surface from the upper edge 80U of the base plate 80. It is formed in a rod shape extending to the lower edge 80D.

FIG. 17 is an enlarged view showing a cross-sectional configuration of the incident surface convex portion 84 in the vertical cross section of the base plate 80.
As shown in the figure, each of the incident surface convex portions 84 has a substantially serrated shape (triangular shape) having a long side 84A and a short side 84B in a vertical cross section, and each incident surface convex portion 84 has a substantially serrated shape (triangular shape). They are arranged at a predetermined pitch (for example, 1.5 mm) without a gap in the traveling direction A.
Each of the incident surface convex portions 84 is incident on the long side 84A at an incident angle θ1, and the light rays refracted there are incident on a flat portion of the exit surface 80A (between the exit surface convex portions 82) at an incident angle θ2. Due to the refraction there, it is emitted in the wide-angle direction. The incident angle θ1 is approximately 45 degrees or less in order to suppress Fresnel reflection at the time of incident, and the incident angle θ2 is an angle at which the light rays incident therein are not totally reflected (for example, in the case of acrylic resin, it is approximately 42 degrees or less). ) Is set to the obtained angle.

Further, as shown in FIG. 18, each of the incident surface convex portions 84 has the light component incident on the short side 84B at the incident angle θ3 among the light rays incident on the long side 84A at the incident angle θ1. It is totally reflected at the above, and when it is incident on a flat portion of the exit surface 80A at an incident angle θ4, it is emitted by refraction there. The incident angle θ3 is an angle at which the light rays incident therein are totally reflected (for example, about 42 degrees or more in the case of acrylic resin), and the incident angle θ4 is an angle at which the light rays incident therein are not totally reflected. Is set to an angle that can be obtained.

Further, as shown in FIG. 19, among the light rays incident on the short side 84B at the incident angle θ5, the light component reflected by Fresnel there is incident on the long side 84A of the adjacent incident surface convex portion 84 at the incident angle θ6 and is emitted. It is incident on a flat portion of the surface 80A at an incident angle θ7. Then, the light component is emitted by refraction on the exit surface 80A, similarly to the light beam incident on the long side 84A. Further, among the light rays incident on the short side 84B at an incident angle θ5, the component refracted there and incident inside is incident on a flat portion of the exit surface 80A at an incident angle θ7, and is emitted by refraction there.
In the present embodiment, the incident angle θ6 is also set to about 45 degrees or less in order to suppress Fresnel reflection at the time of incident, and the incident angle θ7 is the light beam incident on the incident angle θ1. Is set to an angle that does not reflect total reflection.

In this way, on the incident surface 80B of the base plate 80, each incident surface convex portion 84 causes the incident light incident on the incident surface 80B to be emitted from the exit surface 80A in the wide-angle direction by refraction at the exit surface 80A. Compared with the case where the surface convex portion 84 is not provided, the emission range of the emitted light of the base plate 80 is expanded in the wide-angle direction.
As a result, the light emitting points of the individual LEDs 62 extend so as to be continuous with each other in the traveling direction A, and the apparent light source area of each light emitting point is expanded, so that the brightness of each light emitting point is weakened and the emission range of the illumination light Kb is increased. Since it is expanded in a wide angle, as shown in FIG. 16 above, it seems that light is radiated from the road surface illumination light source unit 20 even in a perspective view. In addition to this, in the traveling direction A, the dark lines appear to be in a vertical stripe shape, so that the concentration of the luminance on the individual light emitting points is further relaxed.

Therefore, according to the base plate 80, the emission range of the illumination light Kb emitted from the emission surface 80A is expanded to a wide angle, so that a wider range in the traveling direction A is illuminated by the illumination light Kb, and individual light emitting points are emitted. Glare will be suppressed by expanding the apparent light source area and relaxing the concentration of brightness.

Further, each of the incident surface convex portions 84 is formed in a cross-sectional shape that is incident on the exit surface 80A at an angle that suppresses Fresnel reflection of the light incident on the incident surface convex portion 84 and does not cause total reflection, so that the light can be wide-angled. It can be emitted efficiently.

As shown in FIG. 17, the long side 84A of each incident surface convex portion 84 is formed in a curved surface shape that slightly bulges, and the apex 84C at which the long side 84A and the short side 84B intersect is also formed in a curved surface shape. Has been done. With these curved surface shapes, it is possible to blur the outline of the brightness and darkness, and it is possible to alleviate the continuous intensity of the intensity in the traveling direction A when viewed from the front.

The incident surface convex portion 84 does not necessarily have to extend over the entire width from the upper edge 80U to the lower edge 80D of the base plate 80, and each incident surface convex portion 84 is arranged with a slight gap. May be good.

Next, as the configuration of the base plate 80, the configuration of the exit surface 80A, which is the surface on the side where light is emitted (the side facing the road surface), will be described in detail.
As shown in FIG. 14 above, on the exit surface 80A, a large number of exit surface convex portions 82 forming vertical stripes of light and dark lines having a pitch larger than that of the incident surface 80B are arranged at a predetermined arrangement interval Ta (for example, in the traveling direction A). Approximately 5 mm). Each exit surface convex portion 82 is formed in a rod shape extending from the upper edge 80U to the lower edge 80D of the base plate 80 in a direction perpendicular to the traveling direction A which is the longitudinal direction of the base plate 80.

FIG. 20 is an enlarged view showing a cross-sectional configuration of the exit surface convex portion 82 in the vertical cross section of the base plate 80.
As shown in the figure, each of the opposite convex portion side surfaces 82A and 82B of the exit surface convex portion 82 is formed on a total reflection surface that totally reflects the light incident therein in the traveling direction A.
Due to total reflection on the convex side surfaces 82A and 82B, the traveling direction of a part of the light incident on the convex portion side surface 82A and 82B is a direction in which the traveling direction of the light approaches parallel to the traveling direction A (the exit surface 80A of the base plate 80). , The direction in which the horizontal angle increases). Therefore, the emission range of the illumination light Kb emitted from the emission surface 80A of the base plate 80 is widened. In addition, a small amount of some other light is also directed to the opposite direction of the traveling direction A due to the influence of Fresnel reflection and the apex angle R. In the perspective brightness distribution of FIG. 16, the brightness of the region indicated by the arrow X is generated by reflecting a part of the light directed in the opposite direction of the traveling direction A to the convex portion 82 of the exit surface.

As a result, compared to the case where the exit surface 80A does not have the exit surface convex portion 82 (Fig. 16: Comparative Example above), dark lines are formed in the places where the brightness is concentrated in both the front view of the fixture and the oblique view of the fixture. You will be able to see, and the concentration of brightness will be further relaxed. Especially in the oblique view of the fixture, the apparent area that appears to shine also increases, and this effect also alleviates the concentration of brightness. This will further reduce glare.

However, if the light totally reflected by the convex side surfaces 82A and 82B of the convex portion 82 of the exit surface is incident on the convex portion 82 of the exit surface adjacent to the convex portion 82 and becomes the return light into the apparatus, the light utilization efficiency is lowered. The arrangement interval Ta of the exit surface convex portions 82 in the traveling direction A is widened so that the re-incidentity is small, a wide-angle light distribution can be obtained, and the glare reduction effect is well-balanced.

In the present embodiment, the convex portion 82 of the exit surface has a triangular cross section, but it may be a curved surface shape or a polygonal cross section such as a quadrangular cross section. Further, the protruding surface convex portion 82 does not necessarily have to extend over the entire width from the upper edge 80U to the lower edge 80D of the base plate 80.

Here, as shown in FIG. 15 above, the plate-shaped optical member 60 of the present embodiment has a base plate 80 rather than the total length of the light emitting region 90 in the road surface illumination LED light source 50 of the road surface illumination light source unit 20 in the traveling direction A. Is long, and the light emitting region 90 is arranged so as to be aligned with the center O of the base plate 80. In this case, the incident angle of the light incident on the incident surface 80B of the base plate 80 from the light emitting region 90 differs between the first range G1 corresponding to the light emitting region 90 and the second range G2 on both sides thereof, and the first range. Also in G1, it differs depending on the position in the traveling direction A.
Therefore, in the present embodiment, the cross-sectional shapes of the exit surface convex portion 82 and the incident surface convex portion 84 of the base plate 80 are adjusted for each position in the traveling direction A according to the incident angle of the main light incident therein. There is. At this time, the cross-sectional shapes of the exit surface convex portion 82 and the incident surface convex portion 84 of the base plate 80 are symmetrical with respect to the center O.

More specifically, in the present embodiment, as shown in FIG. 15 above, the range substantially corresponding to the first range G1 is divided into the first range, the first section G1-1 to the first range in order from the one closer to the center O. The third section G1-3 is subdivided into three sections, and the range roughly corresponding to the second range G2 is divided into the second range first section G2-1 and the second range second in order from the one closest to the center O. It is divided into two sections, G2-2.
Then, on the incident surface 80B, the first range first section G1-1 to the first range third section G1-3, and the second range first section G2-1 to the second range second section G2 For each of -2 and for the exit surface 80A, for each of the first range G1 and the second range G2, the cross-sectional shapes of the incident surface convex portion 84 and the exit surface convex portion 82 are the sections thereof. It is adjusted according to the incident angle of the main light beam incident on.

FIG. 21 shows the base plates 80 in the first range first section G1-1 to the first range third section G1-3, and the second range first section G2-1 to the second range second section G2-2. It is a figure which shows the cross-sectional shape.
As shown in the figure, each of the exit surface convex portions 82 has the same length of the convex portion side surfaces 82A and 82B described above in the first range G1 of the center O, and the height thereof is the bottom portion (isosceles right side). It is formed in an isosceles right triangle shape (that is, symmetrical shape) having a cross section that is about 1.8 times to about 2.2 times larger than the width of the bottom surface of the triangle. By setting it high, it is possible to prevent the totally reflected light from returning to the incident surface 80B, and to direct the light to a distant place (wide-angle direction) in the traveling direction A by the total reflection.
On the other hand, in the second range G2, one of the convex side surfaces 82A and 82B has a long triangular cross section. In the second range G2, each of the exit surface convex portions 82 is formed so that the one closer to the center O of the convex portion side surfaces 82A and 82B is longer than the other. Further, the height of the exit surface convex portion 82 of the second range G2 is lower than that of the first range G1.

Further, each of the incident surface convex portions 84 has a symmetrical cross-sectional shape in which the lengths of the long side 84A and the short side 84B described above are the same in the first range first section G1-1 located at the center O. There is. Further, in each section other than the first range first section G1-1, each of the incident surface convex portions 84 has the above-mentioned cross-sectional sawtooth shape, and the side closer to the center O is formed on the long side 84A. The height of the incident surface convex portion 84 in the section away from the center O is lower.

The number of sections of the base plate 80 in the traveling direction A is an example, and can be changed as appropriate. Further, each of the incident surface convex portion 84 and the exit surface convex portion 82 is not fixed to the same shape for each section, but the shape is continuously changed from the center O to the end portion of the plate-shaped optical member 60. May be good.

As shown in FIG. 15, in the plate-shaped optical member 60, the locking pieces 81 at both ends form an L-shape in the vertical cross section, so that the base plate 80 is farther from the light emitting region 90 than the locking piece 81 ( It is located closer to the road side). As a result, in the instrument main body 2, the plate-shaped optical member 60 is arranged close to the front cover 8, so that the apparent light emitting area can be increased and the glare reducing effect can be increased. Since the locking piece 81 is located at a position recessed from the front cover 8 as compared with the base plate 80, it is possible to secure a space for accommodating the head of the mounting screw so as not to protrude from the base plate 80.

As described above, according to the present embodiment, the following effects are obtained.

In the low-position road lighting fixture 1 of the present embodiment, the road surface illumination LED light source 50 which is a linear light source and the light of the road surface illumination LED light source 50 arranged above the road surface illumination LED light source 50 are transmitted to the road surface of the road. A light source for road surface illumination having a reflector 54 for road surface illumination that reflects toward the surface, and a parallel light source 52 for road surface illumination provided between the LED light source 50 for road surface illumination and the reflector 54 for road surface illumination. The LED light source 50 for road surface illumination includes the unit 20, and the light is incident on the parallel light source 52 for road surface illumination toward the back surface 2B side (opposite side to the road side), and the parallel light source 52 for road surface illumination. Changes the traveling direction of the incident light toward the front 2F side (road side) and emits the incident light toward the road surface illumination reflecting plate 54.

According to this configuration, the road surface illumination reflector 54 reflects the light from below toward the lower road surface, so that the upward light is surely reflected by the road surface illumination reflector 54, which is unnecessary. The upward light beam that becomes leakage light can be suppressed. Further, since the light of the LED light source 50 for road surface illumination is radiated upward through the parallel lightening lens 52 for road surface illumination, the above-mentioned direct light flux, which is unnecessary leakage light to the road shoulder portion toward the lower side, is also suppressed. You can also do it. Further, since the light is incident on the road surface illumination parallel lightening lens 52 from the road surface illumination LED light source 50 to the back surface 2B side, it is possible to eliminate the light from the road surface illumination LED light source 50 toward the road on the front surface 2F side. , Unnecessary leaked light can be suppressed more reliably.
Further, by arranging the LED light source 50 for road surface illumination and the reflector 54 for road surface illumination in the vertical direction, the depth dimension of the fixture main body 2 can be made compact.

In the low-position road lighting fixture 1 of the present embodiment, the road surface illumination reflector 54 extends to the road side from the road surface illumination parallel lightening lens 52 at the tip end on the front 2F side, and the light incident therein is extended to the road side. It is provided with an inclined surface 54AS that reflects on the back surface 2B side.
By providing such an inclined surface 54AS, the upward luminous flux that becomes leakage light can be more reliably suppressed, and the light utilization efficiency can be improved.

In the low-position road lighting fixture 1 of the present embodiment, the road surface illumination light source unit 20 is arranged on the road side of the road surface illumination parallel lightening lens 52, covers the road surface illumination parallel lightening lens 52, and has a back surface 2B. A front light-shielding plate 58 for road surface lighting that is inclined to the side is provided.
By providing the front light-shielding plate 58 for road surface illumination, it is possible to reliably block the light from the parallel lightening lens 52 for road surface illumination toward the front 2F side, and the blocked light causes leakage light. It is also possible to avoid the occurrence of an upward luminous flux.

In the low-position road lighting fixture 1 of the present embodiment, the road surface illumination light source unit 20 is illuminated by a pair of road surface illumination side light-shielding plates 59, a road surface illumination reflector 54, and a road surface illumination front light-shielding plate 58. A radiation opening 64 that emits light Kb is partitioned.
Since the radiation opening 64 is partitioned only by a light-shielding plate that blocks light and a reflector that controls light distribution, uncontrolled light radiation can be suppressed with high accuracy.

In the low-position road lighting fixture 1 of the present embodiment, the fixture front shading plate 9 is formed on the front 2F side of the road surface lighting light source unit 20 with a road surface illumination light opening 10 for passing light emitted from the radiation opening 64. Be prepared.
As a result, the generation of leaked light is more reliably suppressed.

In the low-position road lighting fixture 1 of the present embodiment, the radiation opening 64 of the road surface lighting light source unit 20 is provided with a plate-shaped optical member 60 that suppresses glare.
As a result, glare can be suppressed even when the road surface illumination light source unit 20 is arranged near the height of the driver's line of sight.

In the low-position road lighting fixture 1 of the present embodiment, the road surface illumination parallel lightening lens 52 parallelizes the light of the road surface illumination LED light source 50 and emits the light toward the road surface illumination reflector 54. A first parallel lightening section P1 that parallelizes the light of the road surface illumination LED light source 50 by refraction at the incident surface 70 where the light of the road surface illumination LED light source 50 is incident is provided on the front 2F side and is incident. A second parallel lightening section P2 for parallelizing the light of the road surface illumination LED light source 50 by total reflection on the second outer surface 74 is provided on the side opposite to the road side.

According to the parallel lightening lens 52 for road surface illumination, all the light incident on the incident surface 70 can be made compact by suppressing the dimensions from the road side to the opposite side as compared with a lens that makes all the light incident on the incident surface 70 parallel light by refraction.

In the low-position road lighting fixture 1 of the present embodiment, the parallel lightening lens 52 for road surface illumination has a front surface 2F on the road side because the first outer surface 73 of the first parallel lightening portion P1 is a total reflection surface. The light leaking to the side can be prevented, and the generation of the leaked light can be suppressed.

The low-position road lighting fixture 1 of the present embodiment includes a plate-shaped optical member 60 having a plate-shaped base plate 80 that transmits the illumination light Kb extending in the traveling direction A, and the base plate 80 has the illumination light Kb. A plurality of convex incident surface convex portions 84 are provided on the incident surface 80B on the incident side to emit light incident therein from the exit surface 80A of the base plate 80 in the wide angle direction.
According to this configuration, the emission range of the illumination light Kb emitted from the emission surface 80A is expanded to a wide angle, so that a wider range in the traveling direction A is illuminated by the illumination light Kb, and an apparent light source of each light emitting point is used. Glare is suppressed by expanding the area and relaxing the concentration of brightness.

In the low-position road luminaire 1 of the present embodiment, each of the incident surface convex portions 84 incidents the light incident therein on the exit surface 80A at an angle that does not cause total reflection. As a result, the illumination light Kb can be efficiently emitted, and the decrease in the light utilization efficiency due to the plate-shaped optical member 60 can be suppressed.

In the low-position road lighting fixture 1 of the present embodiment, the base plate 80 has a plurality of convex shapes that totally reflect the light incident on the exit surface 80A on the side where the illumination light Kb is emitted and emit it in the wide-angle direction. The exit surface convex portion 82 is provided.
As a result, as compared with the case where the exit surface 80A does not have the exit surface convex portion 82, a dark line is included in the portion where the brightness appears to be concentrated, the concentration of the brightness is further relaxed, and the glare is further suppressed.

In the low-position road lighting fixture 1 of the present embodiment, each of the light emitting surface convex portions 82 is arranged in the traveling direction A at an arrangement interval Ta at which the totally reflected light does not enter the adjacent exit surface convex portion 82. In this case, even if the light is totally reflected, it may be incident on the adjacent exit surface convex portion 82 as long as the light does not pose a problem in practical use.
As a result, the light totally reflected by the convex portion 82 of the exit surface is incident on the convex portion 82 of the exit surface adjacent to the convex portion 82 of the exit surface and becomes return light, which reduces the light utilization efficiency, with exceptions to the extent that it does not pose a problem in practical use. There is no.

It should be noted that the above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.

The road surface illumination light source unit 20 of the above-described embodiment may be used, for example, as a wall surface illumination light source unit that illuminates a wall surface with light extending in one direction. In this case, if light distribution control is not required, it is not necessary to provide a reflector 54 for road surface illumination. For example, the light source unit includes an LED light source 50 (linear light source) for road surface illumination and parallel light for road surface illumination. A lens 52 (translucent optical element) may be provided.

In the plate-shaped optical member 60 of the above-described embodiment, as shown in FIG. 22, a lens portion 194 is provided on the lower edge 80D side of the incident surface 80B of the base plate 80 to direct the light incident therein, and is directly below the plate-shaped optical member 60. You may also irradiate a little light.

The plate-shaped optical member 60 of the above-described embodiment has a function of reducing glare, but is not limited to this, and has a function of directing the illumination light Kb passing therethrough in one direction of the traveling direction A to form a so-called pro beam. May be provided. In this case, as shown in FIGS. 23 (A) and 23 (B), a large number of grids 296 are provided on the exit surface 80A of the base plate 80 to direct the light emitted from the exit surface 80A in one direction of the traveling direction A. Be done.

Unless otherwise specified, the directions such as horizontal and vertical and various numerical values and shapes in the above-described embodiments include a range (so-called equal range) that exerts the same effects as those directions, numerical values, and shapes.

1 Low-position road lighting equipment (lighting equipment)
2 Instrument body 10 Road surface illumination light opening 20 Road surface illumination light source unit 50 Road surface illumination LED light source 60 Plate-shaped optical member 64 Radiation opening 80 Base plate 80A Exit surface 80B Incident surface 80D Lower edge 80U Upper edge 82 Exit surface convex part 84 Incident surface convex part 90 Light source area A Travel direction Kb Illumination light

Claims (4)

In a lighting fixture that illuminates the road with illumination light that extends in the direction of travel of the road
An optical member having a plate-shaped base plate that transmits the illumination light is provided.
The base plate is provided with a plurality of convex incident surface convex portions on the incident surface on the side where the illumination light is incident so that the light incident therein is emitted from the exit surface of the base plate in the wide-angle direction. Lighting equipment that is characterized by that. Each of the incident surface convex portions emits light incident on the incident surface.
It is incident on the exit surface of the base plate at an angle that does not cause total reflection.
The lighting equipment according to claim 1. The base plate is characterized in that a plurality of convex exit surface convex portions that totally reflect the light incident on the exit surface on the side from which the illumination light is emitted and emit the light in the wide-angle direction are provided. The lighting equipment according to claim 1 or 2. Each of the convex portions on the exit surface
The luminaire according to claim 3, wherein the totally reflected light is arranged in the traveling direction at an arrangement interval so as not to be incident on the adjacent convex portion of the exit surface.

Images