JP6582493B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting apparatus that irradiates light on a road surface.

As the road lighting apparatus installed on the sound insulation wall on the side of the road, one that is installed at a height of, for example, about 5 m (meters) from the road surface has been proposed (for example, see Patent Document 1). The lower the position of this type of lighting equipment, the closer it is to the driver's eye level of the vehicle traveling on the road surface. If no measures are taken, the glare felt by the driver is stronger. Become.
The road illuminator of Patent Document 1 suppresses glare felt by the driver by controlling the irradiation range of the pro-beam that irradiates the traveling direction of the vehicle and the counter beam that irradiates the direction opposite to the traveling direction.

Japanese Patent No. 4715430

By the way, when the road lighting equipment is arranged at a lower height of about 1.2 m, a pole is not necessary, which is advantageous for cost reduction, while the lighting equipment is installed near the driver's eyes. There is a risk that the driver may feel dazzled by directly viewing the light from the light source.
The present invention has been made in view of the above-described circumstances, and provides a lighting apparatus that can suppress glare felt by the driver with a configuration installed at a height near the driver's line of sight on the vehicle traveling on the road surface. The purpose is to do.

In order to achieve the above object, the present invention is a lighting device that is installed at a height near the eyes of a driver of a vehicle traveling on a road and irradiates light on the road surface of the road, the optical axis of which is horizontal. a light emitting element disposed so as to be downward, and the upper reflector disposed above the light emitting element, and a lower reflector disposed below the light emitting element, Ri formed by combining, prior to The light emitting element is provided closer to the upper reflecting mirror, and the upper reflecting mirror reflects light from the light emitting element on the lower side in the horizontal direction, and the lower reflecting mirror is closer to the proximal side. Is characterized in that light from the light emitting element is reflected further downward in the horizontal direction, and the upper reflecting mirror extends from the horizontal position to the lower side with respect to the light emitting element.

The present invention, in the lighting fixture, wherein the reflecting surface of the upper reflector is continuous surface gently.

The present invention, in the lighting apparatus, the reflecting surface of the lower reflector is characterized by a surface obtained by combining a plurality of parabolic shape aimed in different directions.

According to the present invention, it is possible to suppress a light beam onto the lateral light, it is possible to suppress the glare felt by the driver.

It is a figure which shows typically the usage condition of the lighting fixture which concerns on this embodiment. It is a perspective view of a lighting fixture. FIG. 3A is a front view, FIG. 3B is a top view, FIG. 3C is a bottom view, and FIG. 3D is a left side view. 3 (E) is a right side view. It is a disassembled perspective view of the right end part of an instrument case. It is a figure which shows the case end plate of the right side, FIG. 5 (A) is the figure seen from the right side, FIG. 5 (B) is a figure which shows XX sectional drawing of FIG. is there. It is side sectional drawing which shows a light source unit with a periphery structure. It is a perspective view of a reflecting mirror. It is a figure which shows a vertical reflection surface and a lower side reflective surface with LED, FIG. 8 (A) is a figure which shows typically the positional relationship of a vertical reflection surface, a lower side reflective surface, and LED, FIG.8 (B) is FIG. (A) is the figure which showed the light which injects into an upper side reflective surface from LED. FIG. 8A shows light incident on the lower reflective surface from the LED. It is a figure which shows the other earthing | grounding structure of an instrument case.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically illustrating a usage mode of the lighting apparatus according to the present embodiment.
The lighting fixture 10 is a road lighting fixture that is installed on a wall portion 101 that is installed on the side of the road 100 and illuminates the road surface 102 of the road 100.
The road 100 is a so-called one-sided two-lane road that is provided with a first lane 103 and a second lane 104 in which the traveling directions of the vehicles are the same, and has two vehicle traffic zones in the same direction. In FIG. 1, the symbol W1 indicates the lane width (3.5 m (meters) in this embodiment) of the first lane 103 and the second lane 104, and the road width is 2 × W1. In FIG. 1, reference numerals 100 </ b> L and 100 </ b> R indicate end portions of the road 100. In addition, the lighting fixture 10 of this embodiment is applicable also to the one-way 1 lane facing road.

  On one side of the road 100, a wall portion 101 is provided separated by a shoulder width W2 (1.75 m in this embodiment). This wall part 101 comprises a sound insulation wall, for example. The wall portion 101 is provided only on the left side when viewed from the traveling direction of the road 100 in FIG. 1, but may be provided on the right side of the road 100 or may be provided on both sides of the road 100. good. 1 shows the case where the lighting fixture 10 is provided on the left wall portion 101, the lighting fixture 10 may be provided on the right wall portion 101.

The luminaires 10 are installed along the road 100 at intervals on the wall portion 101. Each luminaire 10 is installed at a height H1 from the road surface 102 of 1.2 m or in the vicinity thereof, and is provided at a lower position than the conventional one.
By setting this installation height H1, the lighting fixture 10 can be installed using the existing wall portion 101, and a pole for supporting the lighting fixture 1 becomes unnecessary, which is advantageous for cost reduction.

However, in the case of the installation height H1 of about 1.2 m, the height is close to the driver's line of sight of the vehicle traveling on the road 100, so that the driver may directly see the light emitting element. In particular, since the lighting fixture 10 uses an LED (Light Emitting Diode) 41 (FIG. 6 described later) as an example of a light emitting element as a light source, the luminance is higher than that of a lamp light source, and the driver feels more dazzling. It becomes easy. Moreover, if this kind of lighting fixture 10 can be made a simpler structure, it will become advantageous by cost reduction.
Therefore, the lighting fixture 10 is provided with a grounding structure that is advantageous for cost reduction while taking measures against glare to the driver. Hereinafter, the lighting fixture 10 will be described.

FIG. 2 is a perspective view of the lighting fixture 10. 3 is a view of the luminaire 10 as viewed from each direction. FIG. 3 (A) is a front view, FIG. 3 (B) is a top view, FIG. 3 (C) is a bottom view, and FIG. Is a left side view, and FIG. 3E is a right side view.
The lighting fixture 10 includes a fixture case 21 that constitutes a housing of the lighting fixture 10. The instrument case 21 is formed in a horizontally-long rectangular box-like case having an open front and a long left and right length compared to the top and bottom length. The instrument case 21 is a coated metal part in which a metal case made of an aluminum alloy is coated with a weather-resistant paint (polyester powder paint in the present embodiment). Thereby, sufficient corrosion resistance and thermal conductivity are obtained.

As shown in FIGS. 3 (A) to 3 (E), the instrument case 21 includes a plate-like back plate portion 21A constituting the back surface, a plate-like upper plate portion 21B constituting the top surface, and a bottom surface. A plate-like bottom plate portion 21C and side plate portions 21D constituting left and right side surfaces. A region surrounded by these plate portions 21A to 21D opens to the front, and the front opening 21K is covered with a flat front glass 23 (FIG. 6 and the like described later).
The front glass 23 functions as a transparent lid member for preventing rainwater and the like from entering the instrument case 21, and is attached to the bottom plate portion through a pair of left and right hinge portions 25 provided on the upper plate portion 21B. The pair of left and right fasteners 26 provided on 21C are held in a closed state. Moreover, the stay 27 for attaching this instrument case 21 to the wall part 101 is detachably attached to the left and right of the instrument case 21.

Inside the instrument case 21, a light source unit 31, a power terminal block 32, and a power box 33 are accommodated.
The light source unit 31 is a unit that uses an LED 41 (FIG. 6 described later) as a light source, and the details thereof will be described later. The power supply terminal block 32 is a member for connecting the wiring drawn from outside the instrument case 21 (indicated by reference numeral 35A in FIG. 3A) and the wiring of the power supply box 33 (not shown). .
As shown in FIGS. 3A and 3C, the bottom plate portion 21C of the instrument case 21 is provided with two waterproof cable clamps 28A and 28B. The wire 35A is clamped on one waterproof cable clamp 28A, and the ground wire 35B is clamped on the other waterproof cable clamp 28B. The ground wire 35B is drawn into the instrument case 21 via the waterproof cable clamp 28B, and is electrically connected to a case body 52, which will be described later, of the instrument case 21, and the case body 52 is grounded to the ground (reference potential). Let

The power supply box 33 is a device that generates DC power for driving the light source unit 31. The power supply box 33 includes an AC-DC converter, converts commercial AC power supplied from the outside into DC power, and supplies the DC power to the light source unit 31. Note that the power supply box 33 may vary the amount of light of the light source unit 31 by varying DC power (for example, DC current) based on a dimming instruction from the outside. In addition, the appliance case 21 may incorporate a battery as emergency power used in the event of a power failure.
As shown in FIG. 3A, the power supply box 33 is disposed above the light source unit 31, and the power supply terminal block 32 is disposed on the side of the power supply box 33 and the light source unit 31.

(Grounding structure of the instrument case 21)
Next, the grounding structure of the instrument case 21 will be described.
FIG. 4 shows an exploded perspective view of the right end portion of the instrument case 21. As shown in FIGS. 3 (A) to 3 (E) and FIG. 4, the instrument case 21 is configured by combining three housing components (housing portions). That is, the instrument case 21 is configured by combining a pair of left and right case end plates 51 (second housing portion) constituting the left and right side plate portions 21D and a case main body portion 52 (first housing portion). Has been. Note that the left and right case end plates 51 are the same component, and are used with the left and right sides being inverted. Since they are the same parts, only one type of mold is required for manufacturing, and parts can be shared, resulting in cost reduction. In addition, the description which overlaps with right and left is abbreviate | omitted.

  As shown in FIG. 4, the case main body 52 is formed of a metal part extending in the left-right direction with a U-shaped cross section that opens to the front so as to constitute the back plate 21A, the top plate 21B, and the bottom plate 21C. And made by extruding an aluminum alloy. Thus, since the case main body 52 is formed of an extrusion molded part, compared with the case where the back plate part 21A, the upper plate part 21B, and the bottom plate part 21C are manufactured as separate parts, the number of parts is reduced and the rigidity is secured. And it is advantageous from the viewpoint of waterproofing.

The case main body 52 is a painted part that is coated with the above-described weather-resistant paint (polyester powder paint) before assembling the instrument case 21.
The pair of left and right case end plates 51 are formed of the same component, and are metal components that are connected so as to close the left and right openings of the case main body 52. The case end plate 51 is also a painted part painted with the above-described paint (polyester powder paint) before assembling the instrument case 21.

The case main body 52 and the case end plate 51 include a plurality of (with a space between the front and rear and the left and right from the left and right outer sides with a waterproof packing 54 (hereinafter referred to as “waterproof packing 54”) interposed therebetween (see FIG. In this configuration, the screws 55 as four fastening members are fastened and fixed.
The waterproof packing 54 reliably prevents rainwater and the like from entering between the case body 52 and the case end plate 51. Further, a seal washer 56 is inserted between each screw 55 and the case end plate 51, thereby preventing rainwater or the like from entering between each screw 55 and the case end plate 51. In this way, it is possible to effectively prevent rainwater and the like from entering the instrument case 21.

  As shown in FIG. 4, the four screws 55 described above have a length depending on the thickness of the screw insertion portions 51A, 51B, 51C, 51D (see FIG. 3C for 51D) through which the screws 55 are inserted. Is different. That is, the upper and lower screw insertion portions 51A and 51C located on the front side are formed thicker than the upper and lower screw insertion portions 51B and 51D located on the back side (see FIGS. 4 and 3C). . For this reason, the two screws 55 inserted through the upper and lower screw insertion portions 51 </ b> C and 51 </ b> D positioned on the front side are longer than the other screws 55.

In this configuration, one of the four screws 55, more specifically, any one of the two screws 55 inserted into the relatively long screw insertion portions 51A and 51C. As one screw 55, a self-tap screw 55X (FIG. 4) is used. The self-tapping screw 55X is fastened to the case end plate 51 and the case main body 52 by removing the prepared holes provided in both the case end plate 51 and the case main body 52.
Thereby, the coating film adhering to the case end plate 51 and each prepared hole of the case main body 52 is removed, and the case end plate 51 and the case main body 52 are appropriately electrically connected via the self-tap screw 55X which is a conductor. It becomes possible to connect to.
In the present embodiment, one of the four screws 55 is a self-tapping screw, but a plurality of self-tapping screws may be used.

Here, the self-tapping screw 55X is a conductive fastening member having a function capable of cutting a female screw by screwing in, and a wide variety of known ones can be applied to the self-tapping screw 55X.
For the remaining three screws 55, known fastening screws (excluding self-tapping screws) are used. For this reason, a female screw is formed in advance by tapping at a place (hole 52H described later of the case main body 52) where the three screws 55 are fastened, and the screw 55 is fastened to the female screw. Next, the fastening structure of the screw 55 including the self-tapping screw 55X will be described in detail.

As shown in FIG. 4, the case main body 52 has holes 52 </ b> H extending along the width direction of the case main body 52 at positions corresponding to the four corners in a side view. These hole portions 52H are formed at the same time when the case main body portion 52 is extruded, and are used as fastening holes for fastening the four screws 55.
The two upper holes 52 </ b> H are integrally provided on the inner surface of the upper plate 21 </ b> B, and are provided at intervals in parallel to the depth direction of the case main body 52. The two lower holes 52H are holes provided integrally on the inner side surface of the bottom plate portion 21C and spaced in parallel to the depth direction of the case main body 52. The space | interval of the upper and lower hole parts 52H is made into the same space | interval, and it is comprised so that the common case end plate 51 can be connected.

  The hole 52H to which the self-tapping screw 55X is fastened is the same as the prepared hole formed by extrusion. The remaining three holes 52H are formed in the female screw by tapping as described above. Further, these four hole portions 52H are formed as holes that are partially open. Further, these four holes 52 </ b> H extend over the entire longitudinal direction (width direction) of the case main body 52 and can also function as reinforcing ribs that reinforce the case main body 52.

FIG. 5 is a view showing the right case end plate 51, FIG. 5 (A) is a view as seen from the right side, and FIG. 5 (B) is a sectional view taken along line XX of FIG. FIG.
As shown in FIG. 5A, the case end plate 51 is formed with four screw insertion portions 51 </ b> A to 51 </ b> D that are holes communicating with the four holes 52 </ b> H of the case main body 52. Among these screw insertion portions 51A to 51D, the screw insertion portions 51B to 51D into which the self-tapping screw 55X is not inserted have loose fitting holes through which the screws 55 are inserted with play.

On the other hand, as shown in FIG. 5B, the screw insertion portion 51A through which the self-tapping screw 55X is inserted is formed in a loose fitting hole partially having a lower hole portion 51S into which the self-tapping screw 55X is screwed. . The lower hole portion 51S is a hole having a diameter (d1 <d0) smaller than the outer diameter d0 (nominal diameter) of the self-tapping screw 55X, and a predetermined distance S1 from the inlet end and the rear end of the screw insertion portion 51A. , S2 are provided at positions separated from each other. The inner diameter d2 other than the lower hole portion 51S is larger than the outer diameter d0 of the self-tapping screw 55X (d2> d0).
Thus, by providing the lower hole portion 51S in the middle of the screw insertion portion 51A through which the self-tap screw 55X is inserted, a region where the coating film removed when the self-tapping screw 55X is screwed is escaped (corresponding to the region of the inner diameter D2). ) Can be secured on both sides of the pilot hole 51S. Thereby, the removed coating film escapes to the outside of the pilot hole 51S, and it becomes easy to ensure electrical connection more reliably.

In FIG. 5B, the symbol LS indicates the length of the prepared hole 51S. The longer the length LS, the longer the connection length (or connection area) with the self-tapping screw 55X, which is advantageous for electrical connection, but requires a large amount of force for fastening the self-tapping screw 55X.
Therefore, the length LS of the lower hole portion 51S may be appropriately set in consideration of the balance between the sufficient connection length and the force required for fastening. Since the left case end plate 51 is the same component as the right case end plate 51, the screw insertion portion 51 </ b> C becomes a portion having the lower hole portion 51 </ b> S in the left case end plate 51. The self-tapping screw 55X is fastened to the portion 51C (see FIGS. 3A and 3C), and the screw 55 that is a fastening screw is fastened to the remaining screw insertion portions 51A, 51B, and 51D.

  As described above, at least a part of the case main body 52 (first housing portion) and the left and right case end plates 51 (second housing portion) constituting the instrument case 21 are fixed by the self-tap screws 55X. Therefore, the painted case main body 52 and the case end plates 51 can be easily electrically connected to each other. In this configuration, as shown in FIG. 3, the ground wire 35 </ b> B is drawn into the case main body 52 through the waterproof cable clamp 28 </ b> B provided on the bottom plate portion 21 </ b> C of the case main body 52, and is electrically connected to the case main body 52. Connected. Accordingly, the left and right case end plates 51 can be grounded without connecting the ground wires 35B to the left and right case end plates 51, and a simple grounding structure can be achieved.

  Further, as shown in FIG. 4, since the waterproof packing 54 is provided between the case body 52 and the left and right case end plates 51, both a waterproof structure and a ground structure can be achieved. Further, the self-tapping screw 55X is fastened to the screw insertion portion 51A having a relatively large thickness corresponding to the screw insertion length among the plurality of screw insertion portions 51A to 51D of the case end plate 51. It is easy to ensure a sufficient contact length with the case end plate 51.

Of the case main body 52 (first housing) and the left and right case end plates 51 (second housing), the case end plate 51 is a housing on the side where the self-tap screw 55X is inserted. A portion having a diameter smaller than the outer diameter d0 of the self-tapping screw 55X (corresponding to the lower hole portion 51S) is formed in only a part of the screw insertion portions 51A and 51C. As a result, the self-tapping screw 55X can be screwed into the case end plate 51 to ensure electrical connection. In addition, the coating film removed when the self-tapping screw 55X is screwed can be easily released from the lower hole portion 51S, and electrical connection can be easily ensured.
In this embodiment, the lower hole portion 51S is provided in only a part of the screw insertion portion 51A. However, the lower hole portion 51S may be provided in at least a part of the screw insertion portion 51A.

(Measures against glare of light source unit 31)
Next, the light source unit 31 will be described.
FIG. 6 is a side sectional view showing the light source unit 31 together with the peripheral configuration.
The light source unit 31 includes a unit substrate 42 on which the LEDs 41 are mounted at the same height with a space left and right, a reflecting mirror 43 that reflects the light of the LED 41, a plate substrate on which the unit substrate 42 and the reflecting mirror 43 are fixed. The base plate 45 is provided. In FIG. 6, the symbol LH indicates a horizontal plane passing through the LED 41, and the symbol LL indicates the optical axis of the LED 41. 6 is the front side (the road 100 side), and the left side in FIG. 6 is the wall 101 side shown in FIG.

FIG. 7 is a perspective view of the reflecting mirror 43. The reflecting mirror 43 is a light distribution component that distributes the light of the LED 41 so as to illuminate the entire road surface 102 of the road 100. The reflecting mirror 43 is configured by integrally including an upper reflecting mirror 46 disposed above the LED 41 and a lower reflecting mirror 47 disposed below the LED 41. The light of the LED 41 is caused to pass through the lower surface of the upper reflecting mirror 46 (hereinafter referred to as “upper reflecting surface 46S”) and the upper surface of the lower reflecting mirror 43B (hereinafter referred to as “lower reflecting surface 47S”). Reflected toward 100 road surfaces 102.
The light distribution in the road width direction M shown in FIG. 1 is controlled by the upper and lower reflecting surfaces 46S and 47S. Further, the upper reflecting mirror 46 and the lower reflecting mirror 47 are formed in a shape in which a cross section is extruded, that is, in a shape extending in the width direction (corresponding to the road longitudinal direction J shown in FIG. 2) in the same cross section. J can be widely irradiated with light. The road longitudinal direction J includes the traveling direction and the backward direction of the vehicle.

The reflecting mirror 43 integrally includes a pair of left and right side plates 48 that bridge between both edges of the upper reflecting mirror 46 and the lower reflecting mirror 47, and the inner surface of the side plate 48 is formed on the reflecting surface 48S. Has been. Compared with the case where the left and right side plates 48 are provided, compared to the case where the side plates 48 are not provided, the light emitted from the lighting device 10 toward the road 100 can be increased, and the efficiency of taking out the light device can be increased.
The reflecting surfaces 46S, 47S, and 48S of the reflecting mirror 43 are aluminum-deposited surfaces. Thereby, it can be set as the reflective surface which suppressed the diffuse reflection component, and it becomes easy to suppress the increase in upward light flux. Each of the reflection surfaces 46S, 47S, and 48S is not limited to a surface on which aluminum is vapor-deposited, and may be a reflection surface that mainly includes a regular reflection component and has a small diffusion component.

The base plate 45 (FIG. 6) is formed of a metal plate material and is attached to the back plate portion 21 </ b> A of the instrument case 21. As shown in FIG. 6, the base plate 45 is attached obliquely so that the optical axis LL of the LED 41 is directed downward from the horizontal direction toward the road surface 102. Thereby, compared with the case where the optical axis LL of LED41 is made into horizontal orientation, much light quantity to the lower side reflective surface 47S can be allocated. In this configuration, the inclination angle θ1 of the base plate 45 is set to 10 °. However, the inclination angle θ1 may be appropriately adjusted, for example, within the range of 8 to 12 °, not limited to 10 °.
Further, the LEDs 41 are horizontally arranged in a row with a space left and right (corresponding to the traveling direction and the road longitudinal direction J), and the irradiation angle to the left and right, that is, the horizontal angle is widened compared to the case where a single unit is used. In addition, the increase in upward luminous flux and glare to the driver are suppressed as compared with the case where each LED 41 is shifted in the vertical direction.

FIG. 8 is a diagram showing the vertical reflection surface 46S and the lower reflection surface 47S together with the LED 41. FIG. 8A is a diagram schematically showing the positional relationship between the vertical reflection surface 46S and the lower reflection surface 47S and the LED 41. . FIG. 8B shows the light incident on the upper reflecting surface 46S from the LED 41 in FIG. 8A. The vertical angle described below is an angle when the vertical direction is 0 °.
As shown in FIG. 8A, the upper reflecting surface 46S is inclined downward substantially from the proximal end portion 46R on the LED 41 side toward the distal end portion 46F on the opposite side of the LED 41, and the distal end portion 46F is horizontal with the LED 41. It extends to the lower side of the horizontal plane LH as the position. For this reason, the upper reflecting mirror 46 covers the light emission center of the LED 41 in front view of the instrument.
That is, the upper reflecting mirror 46 also serves as a shielding member that prevents the light emission center of the LED 41 from being seen from the front. Thereby, while suppressing the light beam from LED41 to an upper direction, a driver | operator can be prevented from seeing LED41 directly from the front. Therefore, glare to the driver can be effectively suppressed.

As shown in FIG. 8B, the upper reflecting surface 46S reflects light emitted upward and horizontally from the LED 41 at least downward in the horizontal direction (the direction along the horizontal plane LH). Here, the upper reflection surface 46S is formed on an inclined surface that has an incident angle that increases as it is closer to the base end portion 46R on the LED 41 side, and decreases as it approaches the distal end portion 46F side that is opposite to the LED 41. Further, the closer to the base end portion 46R, the more light can be reflected toward the far side in the road width direction M.
Further, the LED 41 is provided near the upper reflecting surface 46S so that the incident angle on the upper reflecting surface 46S does not become excessively large. Further, the upper reflective surface 46S is disposed above the LED 41 with a gap SS therebetween, and the upper reflective surface 46S and the current-carrying portion on the bottom surface of the LED 41 on the unit substrate 42 are sufficiently provided so as not to be easily affected by the induced lightning surge. Are spaced apart.

More specifically, the base end side reflection surface (hereinafter referred to as “base end side reflection surface Y1”) indicated by the region Y1 on the base end portion 46R side (see FIG. 8B) is defined with respect to the horizontal plane LH. In order to reflect light downward in an angle range of 9 ° to 30 °, it is formed on a continuous continuous surface. Thereby, light distribution control is performed within a range of 60 ° to 81 ° in the vertical angle, and the range of the middle of the first lane 103 to the entire second lane 104 on the relatively far side in the road width direction M is illuminated. be able to.
Moreover, since this base end part reflection surface Y1 is formed in the continuous continuous surface, the striped nonuniformity extended in the road longitudinal direction J can be suppressed.

  Since the incident angle of the upper reflecting surface 46S decreases toward the tip end portion 46F, light can be reflected toward the front in the road width direction M as the tip end portion 46F is closer. As shown in FIG. 8B, the distal-side reflective surface (hereinafter referred to as “front-end-side reflective surface Y2”) indicated by the region Y2 on the distal end side with respect to the base-end-side reflective surface Y1 is positioned on the horizontal plane LH. On the other hand, it is formed on a continuous surface that is gently curved so as to reflect light downward in an angle range of 30 ° to 45 °. Thereby, light distribution control is performed within a range of 45 ° to 60 ° in the vertical angle, and the range from the shoulder W2 to the middle of the first lane 103, which is a relatively front side in the road width direction M, can be illuminated. Further, striped unevenness extending in the road longitudinal direction J can be suppressed.

In addition, the region connecting the distal-end-side reflecting surface Y2 and the proximal-end-side reflecting surface Y1 is also formed on a continuous continuous surface, and striped unevenness extending in the road longitudinal direction J can be suppressed.
In addition, when this front end side reflection surface Y2 crosses the horizontal surface LH which passes LED41, the upper side reflection mirror 46 is made to function as a shielding member which does not see the light emission center of LED41 from a front. In addition, when the installation height H1 of the lighting fixture 10 or the width W2 of a road shoulder changes, the reflection angle mentioned above may be changed suitably according to the change.
In this way, the tip-side reflecting surface Y2 away from the LED 41 on the upper reflecting surface 46S is configured to reflect light downward in the horizontal direction with respect to the base-side reflecting surface Y1 near the LED 41, so the LED 41 that is a light source. Is not visible from the front, and the upper reflection surface 46S makes it easy to control the light distribution widely in the road width direction M.

FIG. 9 is a diagram showing light incident on the lower reflecting surface 47S from the LED 41 in FIG. As shown in FIG. 9, the lower reflective surface 47S is inclined downward from the proximal end portion 47R on the LED 41 side toward the distal end portion 47F on the opposite side of the LED 41, and forwards to the lower side of the distal end portion 46F of the upper reflective surface 46S. To extend.
The lower reflective surface 47S is a reflective surface that reflects light emitted downward from the LED 41 downward at least in the horizontal direction, and has a plurality of parabolic reflective surfaces (base end sides) aiming at different areas of the road 100. The reflecting surface Z1 and the tip-side reflecting surface Z2) are formed in a combined shape.

Here, as a result of investigations by the inventors, unless a strong light having a peak light distribution shape is irradiated to a distance in the road width direction M (second lane 104 shown in FIG. 1), the target road surface illuminance ( Brightness) and road surface uniformity. However, if the peak width in the light distribution shape is narrow and the strength is too strong, unevenness may occur in the distance in the road width direction M. Therefore, in this configuration, a plurality of parabolic reflecting surfaces with slightly different target angles are combined.
That is, the lower reflective surface 47S includes a proximal-side reflective surface indicated by a proximal-side region Z1 (referred to as “proximal-side reflective surface Z1”) and a distal-side reflective surface indicated by a distal-side region Z2. (Referred to as “front-end-side reflective surface Z2”).

The base-side reflecting surface Z1 is formed on a paraboloid that aims at a depression angle of 10 ° (vertical angle of 80 °) with respect to the horizontal direction. Moreover, the front end side reflection surface Z2 is formed in the paraboloid which aims at 7.8 degrees (vertical angle 82.2 degrees) with respect to a horizontal direction. In this way, the maximum luminous intensity is set in the range of 80 ° to 82.2 ° in terms of vertical angle, and the target road surface illuminance (luminance) and road surface uniformity are obtained far away in the road width direction M.
Further, since the apparently wide peak can be formed by combining the two peaks of the base-side reflecting surface Z1 and the tip-side reflecting surface Z2, striped unevenness extending in the road longitudinal direction J can be suppressed.

In this manner, the base-side reflecting surface Z1 near the LED 41 of the lower reflecting surface 47S is formed so as to reflect light downward in the horizontal direction with respect to the distal-side reflecting surface Z2 away from the LED 41, and away from the LED 41. Since the far side is illuminated in the road width direction M by the tip side reflection surface Z2, the influence of the size of the LED 41 as the light source (particularly the vertical width in FIG. 9) can be suppressed, and a sharp peak can be easily formed. Accordingly, it is possible to make it difficult to generate a light beam in the vertical direction and the upward direction even if diffusion irradiation occurs due to small undulations on the aluminum deposition surface.
For example, as shown in FIG. 9, light having a width of 8.05 ° from the LED 41 is incident on the point P1 of the base-side reflecting surface Z1 of the lower reflecting surface 47S. From the point P1, light having a variation of an angle of 8.05 ° is emitted.

  On the other hand, since light having a width of 3.8 ° from the LED 41 is incident on the point P2 of the tip-side reflecting surface Z2 of the lower reflecting surface 47S, the spread from the point P2 is smaller than that of the point P1. Light (light having a variation of 3.8 degrees in the case of no diffusion) is emitted. As a result, the tip-side reflecting surface Z2 can emit light with less variation, and it is easier to create a peak suitable for illuminating the far side in the road width direction M (second lane 104). Therefore, it becomes easy to appropriately illuminate a distant place while suppressing the diffuse reflected light in the vertical direction and the upward direction caused by small undulations on the aluminum deposition surface.

  As described above, the lighting fixture 10 of this configuration is a low-position lighting fixture installed at a height near the driver's line of sight of the vehicle traveling on the road 100, and under this configuration (see FIG. 1), As shown in FIG. 8A, the LED 41 which is a light emitting element arranged so that the optical axis LL faces downward from the horizontal, the upper reflecting mirror 46 arranged above the LED 41, and below the LED 41. The lower reflecting mirror 47 is disposed, and the upper reflecting mirror 46 extends downward from the horizontal position with the LED 41. Thereby, the light flux to upward light can be suppressed and the glare which a driver | operator feels can be suppressed.

  Further, as shown in FIG. 8B, the reflecting surface 46S of the upper reflecting mirror 46 is a gently continuous surface, and the upper reflecting mirror 46 reflects the light from the LED 41 on the lower side in the horizontal direction. I am letting. Thereby, while suppressing the striped nonuniformity extended in the road longitudinal direction J, it becomes easy to carry out light distribution control widely in the road width direction M, making LED41 which is a light source invisible from the front.

  Further, as shown in FIG. 9, the reflecting surface 47S of the lower reflecting mirror 47 is a surface in which a plurality of paraboloid shapes aiming at different directions are combined. The light from the LED 41 is reflected on the lower side. As a result, striped unevenness extending in the road longitudinal direction J is suppressed, and the influence of the size of the LED 41 as the light source (particularly the vertical width in FIG. 9) is suppressed to be required at the farthest in the road width direction M. In addition, it becomes easy to form a sharp peak, and it becomes difficult to generate a light beam in the vertical direction and the upward direction even if diffuse irradiation occurs due to small undulations on the aluminum deposition surface.

In addition, as shown in FIG. 8B, the lighting fixture 10 performs light distribution control so as to aim at 80 ° in the vertical angle by the base-end-side reflecting surface Z1 of the lower reflecting surface 47S, and the lower reflecting surface 47S. The light distribution is controlled so as to aim at 82.2 ° in the vertical angle by the front-end-side reflecting surface Z2. Thereby, the maximum luminous intensity is set in the range of 80 ° to 82.2 ° in the vertical angle, and the target road surface illuminance (luminance) and the road surface uniformity can be obtained.
In addition, the range of the maximum luminous intensity may be adjusted within a range in which the target road surface illuminance and the road surface uniformity can be compatible, and according to the inventors' investigation, the maximum luminous intensity is in the range of the vertical angle of 78 ° to 86 °. By setting in this way, it was possible to achieve both the target road surface illuminance and the road surface uniformity.

The above-described embodiments are merely illustrative of one embodiment of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, in the above-described embodiment, the LED is illustrated as an example of the light-emitting element, but any light-emitting element such as an organic EL can be used. Further, as an example of the LED, a high output type LED such as a COB type LED which is advantageous for increasing the brightness may be used, and an arbitrary LED can be used.
Moreover, the grounding structure of the instrument case 21 described above electrically connects the case main body 52 and the case end plate 51 by fixing at least a part of the case main body 52 and the case end plate 51 with a self-tap screw 55X. However, the present invention is not limited to this grounding structure.

FIG. 10 shows another grounding structure of the instrument case 21. In the structure shown in FIG. 10, the self-tapping screw 55 </ b> X is not used, and a known fastening screw is used for all the screws 55. Moreover, the same structure as embodiment mentioned above is attached | subjected and shown with the same code | symbol, and duplication description is abbreviate | omitted.
As shown in FIG. 10, the case end plate 51 is integrally provided with a plurality of protrusions 57 that protrude toward the case main body 52. When the case end plate 51 is brought into contact with the case main body 52 via the waterproof packing 54, these protrusions 57 come into contact with the case main body 52 through the inside of the waterproof packing 54, and the case main body 52 The coating film at the contact portion is scraped to contact the case main body 52.
The protrusions 57 are formed in a thin plate shape, and are easily deformed by a force acting when the case end plate 51 and the case main body 52 are fastened by using the screws 55, and the case end plate 51 and the case main body are deformed. The clearance gap between the parts 52 can be closed appropriately. Thus, the painted case end plate 51 and the case main body 52 can be easily electrically connected to each other, and a simple grounding structure can be obtained.

  Further, in FIG. 10, the protrusion 57 is formed in a tapered shape that narrows toward the tip, so that the coating film is formed into a shape that is easy to scrape. The shape and number of the protrusions 57 are not limited to those described above, and may be changed as appropriate. Further, the protrusion 57 may be provided on at least one of the case end plate 51 and the case main body 52 which are a plurality of casings constituting the instrument case 21. For example, the protrusion 57 may be provided on the case body 52 or may be provided on both the case end plate 51 and the case body 52.

The grounding structure described above is not limited to being applied to the luminaire 10 that illuminates the road 100, but can be widely applied to luminaires that include a casing (appliance case 21) composed of a plurality of painted casing portions. is there.
In addition, the reflecting mirror 43 included in the lighting fixture 10 described above is not limited to an integrated configuration of the upper reflecting mirror 46 and the lower reflecting mirror 47, and may be a separate configuration, and can be changed as appropriate. is there.

10 Lighting equipment 21 Equipment case (housing)
31 Light source unit 32 Power supply terminal block 33 Power supply box 41 LED (light emitting element)
43 Reflector 46 Upper Reflector 46S Upper Reflector 47 Lower Reflector 47S Lower Reflector 51 Case End Plate (Second Housing)
52 Case body (first housing)
54 Waterproof packing 55 Screw (fastening member)
55X Self-tapping screw 100 Road 101 Wall 102 Road surface 103 First lane 104 Second lane

Claims (3)

  A lighting device that is installed at a height near the line of sight of a driver of a vehicle traveling on a road and irradiates light on the road surface of the road,
  A light emitting element that is fixed and arranged so that its optical axis is lower than horizontal,
  An upper reflecting mirror disposed above the light emitting element;
  And a lower reflector disposed below the light emitting element, and
  The light emitting element is provided near the upper reflecting mirror,
  The upper reflecting mirror reflects light from the light emitting element on the lower side in the horizontal direction on the tip side,
  The lower reflecting mirror reflects light from the light emitting element on the lower side in the horizontal direction on the base end side,
  The lighting apparatus according to claim 1, wherein the upper reflecting mirror extends downward from a horizontal position with respect to the light emitting element. The lighting apparatus according to claim 1, wherein a reflection surface of the upper reflecting mirror is a smoothly continuous surface. The lighting apparatus according to claim 1, wherein the reflecting surface of the lower reflecting mirror is a surface in which a plurality of parabolic shapes aiming at different directions are combined.

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