JP2014175088A - Light source unit and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit which easily realizes desired light distribution even if a high output light emitting element module is used, and to provide a lighting device.SOLUTION: A light source unit includes: a lens body 31 which covers a light emitting section 35 of a light emitting element module 30 forming a space R around the light emitting section 35 and distributes light entering from the light emitting section 35; and a reflection surface 50 which is provided facing the space R and reflects direct light emitted from the light emitting section 35 and passing through the space R to compensate light distribution of the lens body 31.

Description

  The present invention relates to a light source unit including a light emitting element module as a light source, and a lighting fixture.

  In the road lighting fixtures, fixtures using LEDs as light sources have been developed along with the higher brightness of LEDs. A light source of this type of road lighting apparatus is generally configured by arranging a plurality of LEDs on a substrate (for example, see Patent Document 1). This LED is a device that is treated as a single circuit component and can control light emission independently of each other. For example, a bullet-type LED in which an LED element is sealed in a lens, or an LED element is disposed in a reflective surface. A chip-type LED or the like is preferably used.

JP 2011-187304 A

However, in the above-described conventional configuration, when a high-power light emitting element module is used as a light source in an application where a larger amount of light is required, the light intensity of the light emitting element module increases. It is difficult to get light.
The present invention has been made in view of the above-described circumstances, and provides a light source unit and a lighting fixture that can easily achieve a desired light distribution even when a high-output light emitting element module is used. For the purpose.

  In order to achieve the above object, a light source unit of the present invention covers a light emitting unit of a light emitting element module with a space around the lens unit and distributes light incident from the light emitting unit, and faces the space. And a reflecting surface that reflects direct light from the light emitting section that has passed through the space and supplements the light distribution of the lens body.

  In the above configuration, the incident surface side of the lens body facing the light emitting portion is formed in a Fresnel lens shape having a plurality of stepped portions, separated from the light emitting portion, and above the emission angle of the light emitting portion. The lower end of the incident surface may be positioned at the bottom.

  The said structure WHEREIN: You may provide a clearance gap between the lower end of the said reflective surface surrounding the light emission part of the said light emitting element module, and an installation surface.

  In the above-described configuration, the lens body integrally includes a main body portion disposed above the light emitting portion and a leg portion that supports the main body portion, and the leg portion has an opening around the main body portion. A space may be provided between the periphery of the light emitting unit and the main body.

  In the above configuration, the main body portion is formed in a substantially rectangular shape when viewed from the front, and the leg portion has leg pieces at four corners of the main body portion, and a pair of two adjacent leg pieces among the four leg pieces. The two pairs of leg pieces may be connected by a connecting portion.

  Moreover, the lighting fixture of this invention was equipped with the said light source unit or one or more.

  According to the present invention, since a space is provided around the light-emitting portion, ventilation is good, and even when a high-power light-emitting element module is used, heat is not generated and thermal damage of the lens body can be prevented. . In addition, since the reflecting surface is provided facing the space, the reflecting surface reflects light passing through the surrounding space from the light emitting unit to compensate for the light distribution of the lens body, so that the light can be used effectively.

It is a front view which shows the tunnel lighting fixture which concerns on embodiment of this invention. It is a figure which shows the installation state of a tunnel lighting fixture. It is a disassembled perspective view which shows a light source part. It is a figure which shows a lens body, (A) is a front view, (B) is a top view, (C) is a bottom view, (D) is a back view, (E) is a side view. It is sectional drawing which shows a lens body, (A) is AA sectional drawing of FIG.4 (D), (B) is BB sectional drawing of FIG.4 (D), (C) is FIG.4 (D). It is CC sectional drawing of. It is a figure which shows a light source unit, (A) is a front view, (B) is a bottom view, (C) is DD sectional drawing in (A). It is a figure which shows the light distribution of the light source unit in the DD cross section of FIG. 6 (A). It is a figure which shows the light distribution of the light source unit in the EE cross section of FIG. 6 (A). It is a figure which shows illuminance distribution, (A) is an illuminance distribution by all the light, (B) is an illuminance distribution by the light which does not hit a reflective surface, (C) is an illuminance distribution by the light which hits the reflective surface, (D) Is an illuminance distribution by light hitting the upper and lower direct light reflecting surfaces, (E) is an illuminance distribution by light hitting the left and right direct light reflecting surfaces, and (F) is an illuminance index in (A) to (E). FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a tunnel lighting fixture is illustrated as an example of a road lighting fixture.
FIG. 1 is a front view showing a tunnel lighting apparatus 1 according to the present embodiment. FIG. 2 is a diagram illustrating an installation state of the tunnel lighting fixture 1. In the present specification, as shown in FIG. 1, the direction facing vertically toward the front side of the page is the front direction, the upper side and the lower side are the upper direction, the lower side, the left side and the right side are the left side. It is defined as direction and right direction.

Prior to the description of the configuration of the tunnel lighting device 1, the installation state of the tunnel lighting device 1 will be described. As shown in FIG. 2, the tunnel lighting device 1 is installed at the entrance of the tunnel 80 on the wall surface or ceiling surface (the ceiling surface in the present embodiment) of the tunnel 80 where the road 81 extends. The road 81 has a road surface 82 defined by two roadway outer lines 82A and 82B extending in parallel. In the present embodiment, the tunnel lighting fixture 1 has the lamp optical axis G on the far side (at the position where it enters the road surface 82 by the width W1 from the nearest roadway 82A on the nearest side (near side) or retreats outside the road surface 82. It is installed on the ceiling surface of the tunnel 80 so as to be positioned on the near side or the far side by a width W2 from the roadway outer line 82B on the opposite side of the near side.
In the present specification, a direction in which the road 81 extends (a direction in which the vehicle travels) is defined as a longitudinal direction J, and a direction orthogonal to the longitudinal direction J is defined as a transverse direction M.

Next, the configuration of the tunnel lighting device 1 will be described.
As shown in FIG. 1, the tunnel lighting device 1 includes a metal device case 2 having an open front. The instrument case 2 is formed in a rectangular box shape that is long in the left-right direction when viewed from the front, and a flat front glass 3 is fitted in the front opening 2A. The front glass 3 is connected to the upper side 1A of the instrument case 2 by a pair of hinges 4 so as to be freely opened and closed, and is fastened to the lower side 1B of the instrument case 2 by a pair of latches 5. The front opening 2A of the instrument case 2 is provided with a packing 9 as a seal member for sealing between the front glass 3 and the opening edge.
An L-shaped metal fitting 6 for installation in the tunnel 80 (FIG. 2) is attached to the upper side surface 1A and the lower side surface 1B of the instrument case 2.
The tunnel lighting device 1 has a posture in which the front glass 3 faces a road surface of the road, and the horizontal direction I which is the direction connecting the left side surface 1C and the right side surface 1D is aligned with the longitudinal direction J of the road 81. Installed.

In the instrument case 2, a light source unit 10, a power supply terminal block 11, and a power supply box 12 are housed.
The light source unit 10 uses an LED as an example of a light emitting element as a light source, and details thereof will be described later. The power terminal block 11 connects the wiring drawn in from the outside of the instrument case 2 and the wiring of the power supply box 12. The power supply box 12 generates DC power for driving the light source unit 10, and 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 10. . Note that the power supply box 12 may vary the amount of light of the light source unit 10 by varying the DC power (for example, DC current) based on a dimming instruction from the outside. In addition, the appliance case 2 may incorporate a battery as an emergency power used in the event of a power failure.

FIG. 3 is an exploded perspective view showing the light source unit 10.
As illustrated in FIGS. 1 to 3, the light source unit 10 includes a plurality of light source units 20 and support legs 21 that arrange the light source units 20 in the vicinity of the front glass 3 (in the vicinity of the front opening 2 </ b> A). . By arranging the light source unit 20 in the vicinity of the front glass 3, the light of the light source unit 20 is efficiently extracted while suppressing the shielding on the inner wall surface of the instrument case 2.
As shown in FIG. 3, the light source unit 20 mounts a light emitting element module 30, a lens body 31 covering the light emitting element module 30, a light emitting element module 30, and a reflector 32 surrounding the lens body 31. The mounting plate 33 is provided.

  The light emitting element module 30 is an LED module having a chip-on-board (COB) structure in which a large number of LEDs are densely arranged on a substrate 34 to form a planar light emitting portion 35 having a substantially circular shape (possibly a quadrangle). . The planar light emitting portion 35 has an optical axis F in a direction substantially perpendicular to the surface, and is housed in the instrument case 2 (FIG. 1) in a posture in which the optical axis F is oriented in the front direction. The luminous intensity distribution of the light emitting element module 30 of the present embodiment spreads in a shape that is substantially close to that of a completely diffusing surface light source.

In general, an LED module having a chip-on-board structure has a large luminance and a high luminance and a large light output because a large number of LEDs are densely arranged.
Therefore, when the light source unit 20 includes the light emitting element module 30 in the light source, a light source unit with a large amount of light can be obtained.
In this embodiment, as shown in FIG.1 and FIG.3, the light source part 10 is provided with the six light emitting element modules 30, and the increase in the further light quantity is aimed at. Specifically, two light emitting element modules 30 are vertically mounted on both upper and lower sides of a rectangular plate-like circuit board 36 to form a light emitting element module unit 37, and the three light emitting element module units 37 are arranged side by side on the left and right. It is arranged on the surface of the mounting plate 33. You may change the number of the light emitting element modules 30 mounted in one light emitting element module unit 37 according to the light quantity requested | required of the tunnel lighting fixture 1. FIG. The light emitting element module unit 37 is fixed to the mounting plate 33 by a fixing member (not shown). An insulating member 38 is disposed facing each light emitting element module 30.

The lens body 31 and the reflector 32 distribute light of the light emitting element module 30, and the lens body 31 and the reflector 32 cause the light source unit 20 to have a horizontally long distribution extending to the left and right. Light is obtained.
The light source unit 10 includes a plurality of light source units 20 as described above, but each light source unit 20 has the same light distribution as each other and illuminates substantially the same irradiation area of the road surface 82, so that road surface luminance and wall surface luminance are obtained. Has been increased.

4A and 4B are diagrams showing the lens body 31. FIG. 4A is a front view, FIG. 4B is a plan view, FIG. 4C is a bottom view, and FIG. 4D is a back view. 4 (E) is a side view. 5 is a cross-sectional view showing the lens body 31, FIG. 5A is a cross-sectional view taken along the line AA in FIG. 4D, FIG. 5B is a cross-sectional view taken along the line BB in FIG. FIG. 5C is a cross-sectional view taken along the line CC of FIG. In FIG. 4A, the symbol C indicates the light emission center of the light emitting unit 35.
As shown in FIG. 3, the lens body 31 is a transmissive optical element that covers the light emitting unit 35 of the light emitting element module 30. Light distribution on both sides. Specifically, as shown in FIG. 4, the lens body 31 has an arch-shaped main body 40 that draws an arc so as to cross the front of the light emitting unit 35 and straddle the left and right sides. The leg part 31A fixed to the mounting plate 33 with a screw or the like is integrally provided at the end part of 40.
The leg portion 31 </ b> A is a member that supports the main body portion 40 by providing a space R between the periphery of the light emitting portion 35 and the main body portion 40 above the light emitting portion 35 (FIG. 3). Has an opening 31A1. In the present embodiment, the leg pieces 31A2 are provided at the four corners of the main body 40 by forming the openings 31A1 on the four sides of the leg 31A.

  The pair of left and right leg pieces 31A2 are respectively connected by a connecting portion 31A3, and the reflector 32 is disposed on the connecting portion 31A3, and is fastened together with the lens body 31 and fixed to the mounting plate 33. In the present embodiment, the lens body 31 is disposed on the mounting plate 33 and the reflector 32 is further stacked. However, the present invention is not limited to this. For example, the reflector 32 is disposed on the mounting plate 33. Further, the lens body 31 may be further stacked. Further, the lens body 31 and the reflector 32 are not limited to being fastened together, and may be individually fixed to the mounting plate 33.

  Due to the arched shape of the main body portion 40, the light from the light emitting portion 35 is distributed to the far left and right sides. More specifically, as shown in FIG. 4 (C), the exit surface 41 of the main body 40 has a central exit portion 41A extending up and down at the central portion, and lateral sides located on the left and right sides of the central exit portion 41A. The light emitting unit 41B and 41B are provided. In the left-right direction, the center emitting portion 41A is formed in a concave shape, and the side emitting portions 41B and 41B are formed in a convex shape. Further, as shown in FIG. 4D, the incident surface 42 includes a central incident portion 42A that faces the central emitting portion 41A, and side incident portions 42B and 42B that are positioned on both the left and right sides of the central incident portion 42A. Configured. In the left-right direction, the central incident portion 42A is formed in a concave shape, and the side incident portions 42B, 42B are strongly inclined so that the side close to the central incident portion 42A is away from the light emitting portion 35, and the central incident portion 42A. The inclination is reduced at a position away from the left and right from the position near the direction perpendicular to the optical axis F. As described above, in the left-right direction, the central emitting portion 41A and the central incident portion 42A are formed in a concave shape, and the side incident portions 42B and 42B are strongly inclined so that the side close to the central incident portion 42A is away from the light emitting portion 35. Light incident from the light emitting unit 35 is refracted in the left-right direction. Further, in the left-right direction, the side emitting portions 41B, 41B are formed in a convex shape, and the inclination of the side incident portions 42B, 42B is made smaller at positions farther to the left and right than the side closer to the central incident portion 42A. The light incident from 35 is prevented from being distributed farther than necessary. Thereby, it is possible to realize a light distribution that is long and highly efficient in the lane axis direction (longitudinal direction J shown in FIG. 2), and the glare can be suppressed small.

  As shown in FIG. 5, the emission surface 41 of the main body 40 has a central emission portion 41 </ b> A and side emission portions 41 </ b> B and 41 </ b> B formed in a convex shape in the vertical direction. In addition, as shown in FIG. 5, the incident surface 42 has a central incident portion 42A formed in a convex shape in the vertical direction, and the side incident portions 42B and 42B formed in a convex shape, or the central incident portion 42A. The side far from the light emitting unit 35 is inclined in a direction away from the light emitting unit 35. As a result, light rays spreading in the vertical direction can be collected to realize a narrow light distribution in the road width direction (transverse direction M shown in FIG. 2). In the present embodiment, since the light emitting area of the light emitting unit 35 (FIG. 3) is large (diameter of about 33 mm), if the curvature of the emission surface 41 is excessively increased, the light emitted from the edge of the light emitting unit 35 may be totally reflected. There is. Therefore, in the present embodiment, the angle of incidence on the exit surface 41 with respect to the light beam spreading in the vertical direction from the light emitting unit 35 is set to a critical angle or less, and the curvature of the exit surface 41 and the curvature or inclination of the entrance surface 42 in the vertical direction are obtained. The light emitted from the light emitting section 35 is appropriately distributed so that unnecessary secondary reflection does not increase in the light source unit 20.

  As described above, the incident surface 42 includes the central incident portion 42A and the side incident portions 42B and 42B. Each side incident portion 42B is formed in a Fresnel lens shape having a plurality of step portions. Although the Fresnel lens shape of the side incident part 42B can take various shapes, in the present embodiment, for example, the side incident part 42B is formed on the first Fresnel lens part 42B1 and the first Fresnel lens part 42B1 and the stepped part. The second Fresnel lens portions 42B2 having different widths are formed so as to overlap each other. The first Fresnel lens portion 42B1 has a plurality of step portions extending vertically in the left-right direction, and the second Fresnel lens portion 42B2 has a plurality of step portions extending in the left-right direction only on the upper side.

6A and 6B are diagrams showing the light source unit 20, in which FIG. 6A is a front view, FIG. 6B is a bottom view, and FIG. 6C is a cross-sectional view along DD in FIG. .
The reflector 32 includes a reflecting surface 50 that reflects direct light that has passed through the opening 31 </ b> A <b> 1 (space R) of the lens body 31 and supplements the light distribution of the lens body 31. The reflecting surface 50 corresponds to the opening 31A1 of the lens body 31, and the direct light reflecting surface 51 as the upper side surface of the reflector 32, the direct light reflecting surface 52 as the lower side surface, the direct light reflecting surface 53 as the left side surface, And a direct light reflecting surface 54 which is a right side surface. These direct light reflecting surfaces 51-54 bend light emitted from the opening 31A1 laterally (up / down / left / right direction) toward the front side to distribute the light, and the range between the far sides of the lens body 31 that distributes light. Is illuminated.
Thereby, a horizontally long irradiation area is irradiated by the light distribution to the far left and right sides by the lens body 31 and the light distribution to the far side by the direct light reflecting surfaces 51-54.
In addition, in order to implement | achieve the desired light distribution between both sides far, the direct-light reflecting surfaces 51, 53, 54 have three facets 51A, 51B, 51C, 53A, 53B, 53C, 54A, 54B, 54C. And two facets 52A and 52B are formed on the direct light reflecting surface 52.

The reflector 32 includes a bottom surface 32A that is fixed to the connecting portion 31A3 of the lens body 31. Reflecting surfaces 51-54 are integrally provided on the bottom surface 32A. The reflecting surface 50 has the bottom surface 32A disposed on the connecting portion 31A3 of the lens body 31, thereby opening a gap δ between the lower end 50A of the reflecting surface 50 and the mounting plate 33 as the installation surface. 33. The bottom surface 32A may be formed so as to be able to reflect light.
The left and right direct light reflecting surfaces 53 and 54 are formed with openings 32B and 32B on both sides of the lower part.

  FIG. 7 is a view showing the light distribution of the light source unit 20 in the DD section of FIG. FIG. 8 is a diagram showing the light distribution of the light source unit 20 in the EE cross section of FIG. FIG. 9 is a diagram showing the illuminance distribution. FIG. 9A shows the illuminance distribution by all the light, FIG. 9B shows the illuminance distribution by the light not hitting the reflecting surface 50, and FIG. The illuminance distribution by the light hitting the reflecting surface 50, FIG. 9D shows the illuminance distribution by the light hitting the upper and lower direct light reflecting surfaces 51 and 52, and FIG. 9E shows the right and left direct light reflecting surfaces 53 and 54. It is a figure which shows the illumination intensity distribution by the light which struck. FIG. 9F is a diagram illustrating an illuminance index in FIGS. 9A to 9E. 9A to 9E, the upper diagram shows the illuminance distribution on the wall surface of the tunnel, and the lower diagram shows the illuminance distribution on the roadway of the tunnel. Further, the illuminance distribution in FIG. 9B is substantially equal to the illuminance distribution of light passing through the lens body 31.

  As shown in FIG. 7, light K1 and K1 ′ passing through the main body 40 of the lens body 31 out of the light emitted from the light emitting unit 35 is distant to the left and right by the arched shape of the main body 40 in the left-right direction. Light distribution. In particular, the light K1 'that is directed from the light emitting unit 35 toward the front and passes through the central emission part 41A is refracted in the left-right direction by the concave shape of the central emission part 41A in the left-right direction, and is distributed to the far left and right sides. As shown in FIG. 8, the light K1 ″ passing through the main body 40 of the lens body 31 is distributed in a narrow range in the road width direction due to the shape of the main body 40 in the vertical direction. As shown in B), a range that is long in the road axis direction and narrow in the road width direction is illuminated.

  As shown in FIGS. 7 and 8, direct light K <b> 2 emitted from the opening 31 </ b> A <b> 1 in the horizontal direction (up / down / left / right direction) out of the light emitted from the light emitting unit 35 is reflected by the reflecting surface 50 toward the front side. The As a result, as shown in FIG. 9C, the range between the far sides of the light distribution of the lens body 31 is illuminated. In particular, as shown in FIG. 9A, the light distribution supplemented by the reflector 32 is increased in the portion P outside the roadway in the range between the far sides on both sides where the lens body 31 distributes light. Further, according to the illuminance distribution shown in FIG. 9, the illuminance distribution on the wall surface of the tunnel can be improved by providing the reflector 32.

Next, the operation of this embodiment will be described.
According to the light source unit 20, the main body 40 of the lens body 31 is provided with an opening 31 </ b> A <b> 1 (space R) at a high position, so that direct light from the light emitting part 35 in the lateral direction is actively extracted from the opening 31 </ b> A <b> 1 The light is reflected by the reflector 32 to compensate for the light distribution of the lens body 31. Therefore, even when the high-power light-emitting element module 30 having a large light-emitting area is used, desired light distribution can be easily realized and light can be effectively used as compared with the case where light is distributed by the lens body 31 or the reflector 32 alone. Available. Further, the light source unit 20 that is easy to use can be realized by easily adjusting the distribution of the light amount distributed to the far side on both the left and right sides and the light amount taken out as the direct light and irradiated between the far sides depending on the size of the opening 31A1. Furthermore, the main body 40 of the lens body 31 does not need to be formed in a size that completely covers the periphery of the light emitting portion 35 as in the case of light distribution by a single lens, and therefore the lens body 31 can be reduced in size, and as a result. The lens body 31 can be manufactured easily and inexpensively, and the compact light source unit 20 can be obtained.

  By providing the opening 31A1 around the lens body 31, the ventilation of the lens body 31 is improved, and even when the high-power light emitting element module 30 is used, heat does not accumulate in the lens body 31, and the lens body 31 Can prevent thermal damage. In addition, since the upper and lower openings 31A1 form a through-hole penetrating the lens body 31 up and down, the light source unit 20 is used in a posture in which the vertical direction is aligned with the vertical direction. Heat can be efficiently released, and the temperature rise of the lens body 31 can be suppressed to prevent thermal damage. In particular, since the main body 40 that covers the light emitting unit 35 is arched, the distance to the light emitting unit 35 is increased, and it is difficult to be affected by the heat generated by the light emitting unit 35. In addition, since the incident surface 42 of the lens body 31 is divided to provide left and right side incident portions 42B and 42B, and each of the side incident portions 42B and 42B has a Fresnel lens shape, the main body portion 40 of the lens body 31 emits light. Since the distance from the light emitting portion 35 to the incident surface 42 of the lens body 31 increases, the lens body 31 can be prevented from being thermally damaged. In addition, since each side incident portion 42B is formed by overlapping a plurality of Fresnel lens portions 42B1 and 42B2, the main body portion 40 is further thinned away from the light emitting portion 35, and the lens body 31 is thermally damaged. Can be prevented more reliably. In the present embodiment, the lower end 43 of the incident surface 42 is positioned above the emission angle of the light emitting unit 35. In addition, since the Fresnel lens shape is used in this way, the thickness of the main body 40 can be reduced, and the lens body 31 can be manufactured easily and inexpensively.

  Here, referring to FIG. 6C, the output (W) of the light emitting element module 30 is W, the distance (mm) between the light emission center C of the light emitting portion 35 and the central portion of the incident surface 42 corresponding to the front is D1, and the light emission. If the shortest distance (mm) between the portion 35 and the lens incident surface 42 is D2, and defined as X1 = D1 / W and X2 = D2 / W, the lens body 31 is more likely to be thermally damaged as X1 and X2 become smaller. As X1 and X2 have larger values, the lens body 31 can be prevented from being damaged by heat, but the lens body 31 becomes larger. When using the light emitting element module 30 having the planar light emitting portion 35 as in the present embodiment, X1 and X2 are preferably in the range of about 0.4 to 1.0, and more preferably X1 is 0. .65 to 0.8 and X2 is in the range of 0.6 to 0.8. In this embodiment, X1 = 0.7 and X2 = 0.67.

  Further, since the gap δ is provided between the reflective surface 50 and the mounting plate 33 that is the installation surface, the reflective surface 50 is provided corresponding to the surrounding opening 31A1, so that the light emitting element module 30 is provided by the reflective surface 50. Even when enclosed, heat can be prevented from being trapped in the reflecting surface 50. Since the gap δ is formed by placing the reflector 32 on the leg portion 31A of the lens body 31, a separate member for making the gap δ is unnecessary, and the assembly of the light source unit 20 is good. Further, since the openings 32B and 32B are formed in the left and right direct light reflecting surfaces 53 and 54, it is possible to prevent heat from being trapped in the reflecting surface 50 by the openings 32B and 32B.

Thus, since the light source unit 20 can withstand high output, it is optimal for tunnel entrance illumination that requires high-intensity illumination.
Tunnel entrance lighting requires a distribution in which the brightness sharply decreases as the angle increases (increases on the wall surface) on the wall surface, and a distribution in which the brightness decreases gently compared to the wall surface on the roadway. The displacement is asymmetric. In the light source unit 20, this distribution can be adjusted by the divided side incident portions 42 </ b> B and 42 </ b> B and the reflecting surface 50.

  As described above, according to the present embodiment, the light source unit 20 is disposed above the light emitting unit 35 of the light emitting element module 30 with a space R around and distributes light incident from the light emitting unit 35. The lens body 31 is provided so as to face the space R, and includes a reflecting surface 50 that reflects direct light from the light emitting unit 35 that passes through the space R and compensates for the light distribution of the lens body 31. With this configuration, since the space R is provided around the light emitting unit 35, the ventilation is good, and even when the high output light emitting element module 30 is used, heat is not generated and the lens body 31 is thermally damaged. While being able to prevent, the luminous efficiency fall of the light emitting element module 30 can be prevented. In addition, since the reflecting surface 50 is provided facing the space R, the reflecting surface 50 reflects light passing through the surrounding space R from the light emitting unit 35 and compensates for the light distribution of the lens body 31, so that the light is effectively used. it can.

  Further, according to the present embodiment, the incident surface 42 side of the lens body 31 facing the light emitting unit 35 is formed into a Fresnel lens shape having a plurality of stepped portions, and the distance from the light emitting unit 35 is separated. With this configuration, since the distance from the light emitting unit 35 to the incident surface 42 of the lens body 31 is increased, thermal damage to the lens body 31 can be more reliably prevented.

  In addition, according to the present embodiment, the gap δ is provided between the lower end 50 </ b> A of the reflecting surface 50 surrounding the light emitting unit 35 of the light emitting element module 30 and the mounting plate 33 that is the installation surface. With this configuration, even when the light emitting element module 30 is surrounded by the reflective surface 50, it is possible to prevent heat from being trapped in the reflective surface 50.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the central portion of the exit surface of the lens body has a concave shape, and the entrance surface of the lens body has a Fresnel lens shape, but the shapes of the exit surface 41 and the entrance surface 42 are limited to this. It is not something.

Moreover, in the said embodiment, although LED was illustrated as an example of a light emitting element, not only this but arbitrary elements can be used.
Moreover, in the said embodiment, although the tunnel lighting fixture was illustrated as an example of the lighting fixture for roads, it is not restricted to this, For example, various lighting fixtures etc. which are installed in the wall surface of the sound insulation wall of an expressway and illuminate a road surface are various. It can be applied to road lighting equipment.
Furthermore, the illuminating device and the light source unit of the present invention can be applied to a device for illuminating a wide irradiation area in a wide range while controlling the irradiation area in the vertical direction, regardless of the road lighting apparatus.

1 Tunnel lighting equipment (lighting equipment)
20 light source unit 30 light emitting element module 31 lens body 31A opening 33 mounting plate (installation surface)
35 Light Emitting Part 42 Incident Surface 50 Reflecting Surface 50A Lower End R Space δ Gap

Claims (6)

A lens body that covers the light emitting part of the light emitting element module with a space around it, and distributes light incident from the light emitting part;
A reflective surface that is provided facing the space, reflects direct light from the light emitting unit that passes through the space, and compensates for light distribution of the lens body;
A light source unit comprising:   The incident surface side of the lens body facing the light emitting portion is formed into a Fresnel lens shape having a plurality of stepped portions, the distance from the light emitting portion is increased, and the incident surface is above the emission angle of the light emitting portion. The light source unit according to claim 1, wherein a lower end of the light source unit is positioned.   The light source unit according to claim 1, wherein a gap is provided between a lower end of the reflection surface surrounding the light emitting unit of the light emitting element module and an installation surface. The lens body integrally includes a main body portion disposed above the light emitting portion and a leg portion that supports the main body portion,
The said leg part has an opening around the said main-body part, and the space is provided between the circumference | surroundings of the said light emission part, and the said main-body part, The Claim 1 thru | or 3 characterized by the above-mentioned. Light source unit. The main body is formed in a substantially rectangular shape in front view,
The leg part has leg pieces at the four corners of the main body part, and two pairs of leg pieces, which are a pair of two leg pieces adjacent to each other among the four leg pieces, are connected by connecting parts, respectively. The light source unit according to claim 1, wherein:   A lighting fixture comprising one or a plurality of light source units according to any one of claims 1 to 5.