JP6070083B2 - Optical element, optical element unit, and lighting apparatus - Google Patents

Description

  The present invention relates to a transmissive optical element that covers a light emitting element and distributes light of the light emitting element, and a lighting fixture.

  2. Description of the Related Art Conventionally, there has been known a lighting fixture that includes a lens body that is one of optical elements that cover an LED, controls the light distribution of the LED light by the lens body, and irradiates a horizontally long irradiation area (for example, patents). Reference 1).

JP 2011-204445 A

By the way, the inventor of this application can irradiate with sufficient illuminance by distributing a desired light amount to both ends of the horizontally long irradiation area by configuring the lens body so that the light in the optical axis direction of the LED is divided into right and left. However, the knowledge that there is a problem that the illuminance falls in the central part was obtained.
This invention was made to solve the above-mentioned problem, while irradiating both ends of a horizontally long irradiation area with sufficient illuminance, an optical element that can suppress a drop in illuminance at the center, an optical element unit, And it aims at providing a lighting fixture.

In order to achieve the above object, the present invention is a transmissive optical element that covers a light emitting element and controls the light of the light emitting element, and is disposed on the left and right of the light emitting element, and the light of the light emitting element is curved. The first and second convex portions that are refracted by the shape exit surface and bisected in the left-right direction and directed to the left and right sides of the horizontally elongated irradiation area, and the curved shapes of the exit surfaces of the first and second convex portions are continuous. A third convex shape formed between the first convex portion and the second convex portion so as to fill the concave portion of the coupling portion. And irradiating with light controlled by the first and second convex portions with sufficient illuminance to the left and right ends of the horizontally elongated irradiation area, and the first and second convex shapes In the range around the optical axis of the light emitting element, sufficient light intensity cannot be obtained by the light controlled by the light source. The is characterized in that illuminating the light controlled by the third convex portion.

  Further, the present invention provides the optical element as described above, in which light directed toward at least one of the front direction and the rear direction orthogonal to the left-right direction is directed to the same direction as the irradiation area of the third convex portion, and is more extensive. A reflective surface for reflecting is provided.

  According to the present invention, in the optical element, the reflection surface is configured at an angle that totally reflects light from the light emitting element.

  The present invention is an optical element unit including a plurality of the optical elements described above, wherein the plurality of optical elements are arranged with the left-right direction and the front-rear direction parallel to each other.

  In addition, the present invention includes a light emitting element and any one of the optical elements or the optical element unit described above, and illuminates a horizontally long area.

  According to the optical element of the present invention, since the third convex portion that collects the light of the light emitting element around the vicinity of the optical axis is provided, the first and second convex portions are formed at both ends of the horizontally elongated irradiation area. It is possible to suppress a drop in illuminance at the central portion in the horizontally long irradiation area while ensuring sufficient illuminance by irradiating with light of the light emitting element directed to the left and right of the light emitting element.

It is a figure which shows the installation aspect of the street light which concerns on this embodiment. It is the disassembled perspective view which looked at the street light from the downward direction. It is a figure which shows the structure of a lens unit, (A) is a front view, (B) is a rear view. It is a perspective view of a lens body. It is a figure which shows the structure of a lens body, (A) is a front view, (B) is a left side view, (C) is a right side view, (D) is a front side view, (E) is a rear side view, F) is a rear view. FIG. 6 is a simplified diagram illustrating a connecting portion of a lens unit main body including a section taken along the line VI-VI in FIG. 5. It is VII-VII arrow sectional drawing of FIG. It is a light ray figure of the light controlled by a lens body, and shows the light ray figure seen from the front direction of a lens body. It is a light ray figure of the light controlled by a lens body, and shows the light ray figure seen from the right side of the left-right direction of a lens body. FIG. 10A is an illuminance distribution diagram on a street surface illuminated by light whose light distribution is controlled by the lens body, and FIG. 10A is a street surface illuminated by light whose light distribution is controlled by a side convex portion. FIG. 10B is an illuminance distribution diagram on a street surface illuminated by light whose light distribution is controlled at the central convex portion, and FIG. 10C is a side convex portion and a central convex portion. Illustrates the illuminance distribution on the street surface illuminated by total light with controlled light distribution. FIG. 11A is an illuminance distribution diagram on a street surface illuminated by light whose light distribution is controlled by a lens body, and FIG. 11A is an illuminance on a street surface illuminated by light whose light distribution is controlled by the lens unit body. Fig. 11B is a distribution diagram, Fig. 11B is an illuminance distribution diagram on the street surface illuminated by light whose light distribution is controlled by the convex reflection portion, and Fig. 11C is a light distribution to the convex reflection portion and the lens unit main body. The illuminance distribution figure in the street surface illuminated by the total light controlled is shown. It is a figure which shows the other installation aspect of a street light.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing an installation mode of a street light 1 according to the present embodiment.
As shown in FIG. 1, the street lamp 1 as a lighting fixture is attached to a column 5 erected on the street side 3A of the street 3, lights up at night, and has a wide range along the street direction G in which the street 3 extends. It is an instrument that illuminates the irradiation area E. The street light 1 is provided, for example, at a predetermined height (for example, 4.1 meters) from the road surface (street surface) 3R of the street 3, and is designed to obtain a specified brightness in the irradiation area E. Yes.
The street light 1 includes an appliance body 7 and an arm 9 that connects the appliance body 7 and the column 5. Specifically, the instrument body 7 is a light emitting element that is covered by the top plate 11A and is housed in the instrument casing 11 and the instrument casing 11 having the irradiation opening 11B below and projects light to the irradiation opening 11B. The LED module 13 and the lower surface globe 15 that covers the irradiation opening 11 </ b> B are provided, and the street surface 3 </ b> R of the street 3 is irradiated with light through the lower surface globe 15.

FIG. 2 is an exploded perspective view of the street light 1 as viewed from below, and the illustration of the lower surface globe 15 is omitted.
As shown in FIG. 2, the LED module 13 includes four LED substrates 17, a module attachment plate 19 to which the four LED substrates 17 are attached, and a module attachment plate 19 so as to cover the LED substrate 17 for each LED substrate 17. And a lens unit 21 which is a flat optical element unit for controlling the light of the LED substrate 17.
Each LED board 17 is a substantially rectangular circuit mounting board. For example, a current-carrying part (not shown) is made of a highly heat conductive copper foil, and other insulating parts (not shown) are made of a resin board. It has been. A plurality of LEDs 23 are mounted (mounted) on the mounting surface of the LED substrate 17. As the LED 23, a so-called surface mount type LED in which an LED chip is disposed in a reflector and sealed with a resin is used.
The street light 1 is provided with the irradiation opening 11B of the appliance housing 11 horizontally, and the LED module 13 is accommodated in the appliance housing 11 with the lens unit 21 facing the irradiation opening 11B. Yes.
A power supply device 24 that supplies power to the street lamp 1 is provided inside the support column 5 on the lower end side.

3A and 3B are diagrams showing the configuration of the lens unit 21. FIG. 3A is a front view and FIG. 3B is a rear view. FIG. 3B also shows the LED 23 inserted into the lens unit 21.
3A and 3B, the lens unit 21 has a lens body 25 as an optical element at a position corresponding to each of the LEDs 23.
As shown in FIG. 3A, the lens body 25 is formed so as to protrude to the front (front surface) side of the lens unit 21. On the back side of the lens unit 21, as shown in FIG. 3 (B), an LED insertion recess 41 (described later in detail) is provided at a position corresponding to each lens body 25, and the LED 23 mounted on an LED substrate (not shown). Is inserted into the LED insertion recess 41.
In this embodiment, the lens bodies 25 and the LEDs 23 are arranged in three rows along parallel column lines L1 to L3, and three in the first and third rows and two in the second row.

Next, details of the configuration of the lens body 25 will be described.
4 is a perspective view of the lens body, and FIG. 5 is a diagram illustrating the configuration of the lens body. FIG. 5A is a front view, FIG. 5B is a left side view, and FIG. 5D is a front side view, FIG. 5E is a rear side view, and FIG. 5F is a rear view. FIG. 6 is a simplified diagram showing the connecting portion 37 of the lens portion main body 31 including a cross section taken along the line VI-VI in FIG. 7 is a cross-sectional view taken along arrow VII-VII in FIG.
Note that FIG. 5A corresponds to an enlarged view of a portion B in FIG.

  4 and 5, the lens body 25 provided integrally with the lens unit 21 includes a lens part main body 31 and a convex reflection part 32 provided integrally with the lens part main body 31. The lens unit body 31 includes a pair of left and right side convex portions 33 and 35 (first and second convex portions), and a central convex portion 39 (third portion provided integrally with the pair of side convex portions 33 and 35. Convex part). The side convex portions 33 and 35 protrude from the rear side of the lens unit 21 as a base end. The plurality of lens bodies 25 are provided such that the left and right directions in which the pair of side convex portions 33 and 35 are aligned are parallel to each other and the left and right directions are perpendicular to the column lines L1 to L3 (see FIG. 3). Yes.

Each lens body 25 is provided so as to cover the LED 23 with a pair of side convex portions 33 and 35.
Here, the street lamp 1 is installed on the street side 3 </ b> A in a state where the left and right directions of the lens body 25 coincide with the street direction G when viewed from the height direction. As will be described later, the pair of side convex portions 33 and 35 have emission surfaces (control surfaces) 33A and 35A constituting the outer surface of the lens unit 21, and emit light emitted from the LED 23 in the street direction G. The light is refracted by the surfaces 33A and 35A and controlled so as to be directed to both sides of the street direction G of the LED 23. Thus, the connecting portion 37 of the pair of side convex portions 33 and 35 that bisect the light of the LED 23 in the left-right direction is formed in a concave shape from the vicinity of the front end in the front-rear direction orthogonal to the left-right direction to the rear end.

6 and 7, the pair of side convex portions 33 and 35 are connected to each other, and the connecting portion of the pair of side convex portions 33 and 35 is connected to the back surface (inner surface) side of the lens body 25. The aforementioned LED insertion recess 41 extends along the boundary.
The LED insertion recess 41 has a parabolic cross-sectional surface extending from the vicinity of the front end to the vicinity of the rear end of the lens unit main body 31 and a surface blocking the LED insertion recess 41 on both sides in the front-rear direction, which is the direction in which the LED insertion recess 41 extends. Have. These surfaces constitute a light incident surface of the LED 23 in the pair of side convex portions 33 and 35. Hereinafter, of the surfaces of the LED insertion recess 41, a parabolic cross-sectional surface is referred to as an incident surface 41A, and a surface that closes the rear end of the LED insertion recess 41 is referred to as an incident surface 41B. Of the incident surface 41A, the left half and the right half in the left-right direction constitute the incident surfaces of the pair of side convex portions 33 and 35, respectively.

  Here, since the street light 1 is installed on the street side 3A, in the street width direction W, the light emitted from the side convex portions 33 and 35 of each lens body 25 is not directly under the lens body 25 but on the street. The optical center J of the lens unit body 31 is tilted with respect to the optical axis K of the LED 23 so as to face the center in the street width direction W (see FIG. 7). Due to this, the LED insertion recess 41 is inclined so that the depth of the incident surface 41A becomes deeper toward the rear end. In addition, the incident surface 41B is a substantially flat surface, and is positioned rearward from the optical axis K and inclined toward the optical axis K. The wall position has been changed.

  Further, as shown in FIG. 6, the connecting portion 37 of the pair of side convex portions 33 and 35 has a concave shape by connecting the curved shapes of the emission surfaces 33A and 35A of the side convex portions 33 and 35, The central convex portion 39 is formed integrally between the pair of side convex portions 33 and 35 so as to fill the recess in the connecting portion 37. The exit surface 39A (control surface) of the central convex portion 39 constitutes the protruding end surface of the lens unit body 31, and the light passing through the connecting portion 37 mainly gathers forward from the vicinity of the optical axis K on the exit surface 39A. Refracted and emitted.

Further, in this specification, the front and rear of the lens unit main body 31 are defined as directions orthogonal to the left-right direction of the lens unit main body 31, and the lens bodies 25 of all the lens units 21 are arranged in the street direction. The tool body 7 is provided in the instrument body 7 so as to coincide with the width direction W and to be aligned in the front-rear direction.
As shown in FIGS. 5 and 7, the lens portion main body 31 is provided with a convex reflecting portion 32 behind the lens portion main body 31. The lens portion main body 31 is incident on the lens portion main body 31 from the incident surface 41 </ b> B. The light traveling backward is reflected by the convex reflecting portion 32 in a wider range toward the same direction as the irradiation area of the central convex portion 39.
The convex reflecting portion 32 is disposed across the pair of side convex portions 33 and 35 and extends from the base ends of the pair of side convex portions 33 and 35 and protrudes from the pair of side convex portions 33 and 35. Has been. The width of the convex reflecting portion 32 is slightly narrower than the range where the light incident from the incident surface 41B reaches.
The surface of the convex reflection part 32 located on the opposite side to the lens part main body 31 is configured as a reflection surface that totally reflects the light incident from the incident surface 41B. The reflecting surface is a recessed surface 32A that is recessed from both sides toward the center, and details will be described later. Further, the recessed surface 32A is divided into three in the direction from the projecting end to the base end, and is formed into an upper stage, a middle stage, and a lower stage in order from the projecting end side. In the following description, the upper stage is the reflecting surface 53, the middle stage is the reflecting surface 55, and the lower stage is the reflecting surface 57.

  The reflective surface 55 is configured by a curved surface, and the reflective surfaces 53 and 57 are configured by a substantially flat surface. The reason why the surface shapes of the reflecting surfaces 53, 55, and 57 are different is that they are designed to satisfy the following two conditions. That is, the reflection surfaces 53, 55, and 57 are formed at an angle that totally reflects light with respect to the incident angle of light, and light that reaches the irradiation area of the central convex portion 39 described later. It is designed on the condition of reflecting the point. In order to satisfy these two conditions, the reflecting surfaces 53, 55, and 57 have different shapes.

The convex reflection part 32 protrudes greatly behind the lens part body 31 by configuring the light incident surface 41B toward the convex reflection part 32 as a flat surface inclined with respect to the optical axis K as described above. Can be suppressed.
In addition, the surface of the convex reflecting portion 32 located on the side facing the lens unit main body 31 is reflected by the reflecting surfaces 53, 55, and 57, and refracts and emits the light transmitted through the convex reflecting portion 32. The light exit surface (control surface) 59 controls the light to be emitted.
The reflecting surface 53 has a shape that matches the angle of the punching taper necessary for improving the moldability. In the lens unit 21, a hole 43 used for molding the convex reflecting portion 32 is formed on the proximal end side of the convex reflecting portion 32.

Next, light control by the lens body 25 will be described.
Here, the control of the light of the lens body 25 will be described on the assumption that one of the plurality of sets of lens bodies 25 and LEDs 23 in the street lamp 1 is provided on the street side 3A. The control of the light of the lens body 25 in the other lens body 25 and the LED 23 is also described in the same manner.
FIG. 8 is a ray diagram of light controlled by the lens body 25, and shows a ray diagram viewed from the front side of the lens body 25. FIG. 9 is a ray diagram of light controlled by the lens body 25, and shows a ray diagram as viewed from the right side of the lens body 25 in the left-right direction. FIG. 10 is an illuminance distribution diagram on the street surface 3R illuminated by the light whose light distribution is controlled by the lens unit main body 31, and FIG. 10A shows the light distribution controlled by the side convex portions 33 and 35. Illuminance distribution diagram on the street surface 3R illuminated by light, FIG. 10B is an illuminance distribution diagram on the street surface 3R illuminated by light whose light distribution is controlled by the central convex portion 39, FIG. ) Shows the illuminance distribution on the street surface 3R illuminated by the total light whose light distribution is controlled by the side convex portions 33 and 35 and the central convex portion 39. FIG. 11 is an illuminance distribution diagram on the street surface 3R illuminated by light whose light distribution is controlled by the lens body 25. FIG. 11A is illuminated by light whose light distribution is controlled by the lens body 31. Illuminance distribution diagram on the street surface 3R, FIG. 11B is an illuminance distribution diagram on the street surface 3R illuminated by the light whose light distribution is controlled by the convex reflector 32, and FIG. The illuminance distribution figure in the street surface 3R illuminated by the total light by which the light distribution was controlled by the reflection part 32 and the lens part main body 31 is shown.
10, the illuminance distribution in the horizontally long area EA that is included in the irradiation area E (see FIG. 1) of the horizontally long street surface 3R spreading on both sides of the lens body 25 and has the same width as the street 3 will be described.

In FIG. 8, the side convex portion 33 located on the left side refracts the light 61 incident from the incident surface 41 </ b> A by the emission surface 33 </ b> A and directs it toward the left side of the LED 23. Further, the side convex portion 35 located on the right side refracts the light 63 incident from the incident surface 41 </ b> A by the emission surface 35 </ b> A and directs it to the right side of the LED 23.
As shown by an arrow YB in FIG. 10A, the light emitted from the emission surface 33A has an illuminance of light reaching the first irradiation point P1 located on the left side of the center of the area EA in the street direction G. The street surface 3R is illuminated so as to be maximum in the area EA. Further, the light emitted from the exit surface 35A has an illuminance of light reaching the second irradiation point P2 located on the right side of the center of the area EA in the street direction G as indicated by an arrow YB within the area EA. The street surface 3R is illuminated so as to be maximum. The first and second irradiation points P <b> 1 and P <b> 2 are located approximately at the center of the street 3 in the street width direction W.

Although the illuminance decreases as the distance from the first and second irradiation points P1 and P2 decreases, the side convex portions 33 and 35 direct light toward both sides thereof, and do not direct light inside each other. In particular, the illuminance rapidly decreases between the first and second irradiation points P1 and P2. As a result, an area EB with extremely low illuminance is formed in the street width direction W in the vicinity of the optical axis K of the LED 23 at the intermediate portion between the first and second irradiation points P1 and P2. On the other hand, when the street direction G is away from the first and second irradiation points P1, P2 in the direction opposite to the LED 23, the decrease in illuminance on the street surface 3R is moderate, and the area EA Sufficient illuminance is secured at both ends. Also, outside the area between the first and second irradiation points P1 and P2, the illuminance decreases at a certain rate even when moving away from the first and second irradiation points P1 and P2 in the street width direction W. Since the width of the street surface 3R is narrower than the length of the EA in the horizontal direction, the illuminance necessary for the illumination of the street surface 3R is secured.
As described above, the light controlled by the pair of side convex portions 33 and 35 is moved from the vicinity of the optical axis K of the LED 23 to the front of the horizontally elongated area EA except for the area of light collected forward. Irradiate with sufficient illuminance.

In FIG. 8, light 65 is incident on the central convex portion 39 via the connecting portion 37 of the pair of side convex portions 33 and 35 located between the central convex portion 39 and the LED 23.
By the way, when the light 65 incident on the connecting portion 37 from the LED 23 is not controlled by the central convex portion 39, the light 65 spreads in a relatively wide range around the optical axis K. The central convex portion 39 collects the light 65 spreading over this wide range from the vicinity of the optical axis K of the LED 23 toward the front area.

As shown in FIG. 10B, the irradiation area of the light collected by the central convex portion 39 is centered on the third irradiation point P3 located in the substantially middle portion between the first and second irradiation points P1 and P2. The area EC includes the area EB. The area EC is set so as to overlap with the area EB, and is located in an area where light travels forward from the vicinity of the optical axis K. Both sides of the area EC are areas ED with extremely low illuminance.
Thus, the area EC that overlaps the area EB where sufficient illuminance cannot be obtained by the light controlled by the pair of side convex portions 33 and 35 is illuminated by the light controlled by the central convex portion 39. Insufficient illuminance in the area EB is compensated by the illuminance of light controlled by the central convex portion 39. For this reason, as shown in FIG. 10C, the illuminance part in the horizontally long area EA on the street surface 3R illuminated by the total light controlled by the lens body 31 is on both sides of the middle part of the area EA. Although the illuminance distribution is substantially symmetric, the illuminance at the center of the area EA does not drop. While ensuring high illuminance while suppressing uneven illuminance throughout the area EA, good uniformity is ensured, but illuminance falls slightly from both sides between P1 and P3 or between P2 and P3. Areas EL1 and EL2 are generated.

In FIG. 9, the light 67 that enters the pair of side convex portions 33 and 35 from the incident surface 41 </ b> B and travels to the rear side further travels toward the convex reflective portion 32. This light 67 is totally reflected when it reaches the reflecting surfaces 53, 55, 57 formed on the outer surface of the convex reflecting portion 32, and becomes light 69 directed into the irradiation area of the central convex portion 39. As shown in FIG. 11 (B), the light 69 is emitted under the control of the convex reflecting portion 32 and is emitted into an area EE including the area EC that is the irradiation area of the central convex portion 39 described above. Mainly directed to ensure illuminance in the area EE.
This makes it possible to supplement the illuminance of the area EC, which is the irradiation area of the central convex portion 39, with the illuminance of light controlled by the convex reflective portion 32, and the light controlled by the side convex portions 33 and 35. It is possible to further increase the illuminance in the area including the area EB that is not irradiated. Note that both sides of the area EE are areas EF with extremely low illuminance.
Here, the light emitted from the central convex portion 39 irradiates the area EC so that the illuminance is highest at the approximate center of the area EA. For this reason, if the light emitted from the convex reflection part 32 is controlled so that the illuminance is highest at the center of the area EA, the illuminance at the center of the area EA becomes too high. Therefore, as described above, the convex reflecting portion 32 is formed with a concave surface 32A that is recessed from both sides toward the central portion. As a result, the illuminance distribution in the area EE is formed substantially symmetrically on both sides of the central portion of the area EA. However, as shown in FIG. The illuminance is highest in the areas EL3 and EL4 arranged with the part interposed therebetween. The area EL3 wraps in the area EL1 and the area EL4 wraps in the area EL2. The illuminance of the areas EL1 and EL2 located on both sides of the area EA is compensated while suppressing the illuminance at the center of the area EA from becoming too high. Is called.

  Further, as shown in FIG. 11A, it is described that in the horizontally long area EA where the total light controlled by the lens unit main body 31 is irradiated, high illuminance is secured while suppressing illuminance unevenness. However, the light controlled by the convex reflection part 32 further suppresses the illuminance unevenness in the area EA. That is, as can be seen from the comparison between FIG. 11A and FIG. 11C, illumination unevenness is further increased in the horizontally long area EA by illuminating the area EE with the light controlled by the convex reflecting portion 32. In addition to being improved, the range that can be illuminated with high illuminance is also expanded.

Moreover, the following effects are acquired by forming the convex-shaped reflection part 32 in the lens part main body 31 integrally. As the surrounding environment where the street light 1 is installed, for example, a house is built adjacent to the outside of the street 3, or there are rice fields and fields adjacent to the outside of the street 3. When the light from the street lamp 1 enters the house, it becomes a factor that disturbs the life cycle of the resident. In addition, if light leaks to the rice fields or fields adjacent to the outside of the street 3, the leaked light may adversely affect the growth of the crops, or the pests that gather in the light may cause damage to the crops. . In order to avoid such light pollution, there is a case where it is desired to suppress the irradiation of light behind the street lamp 1.
By providing the convex reflection portion 32, it is possible to suppress the light emitted from the LED 23 toward the rear of the street lamp 1 from being reflected by the reflecting surfaces 53, 55, and 57 and toward the rear of the street lamp 1. In the present embodiment, unnecessary light that goes to the outside of the street 3 is effectively used as light that supplements the illuminance of the area EB located between the irradiation areas of the pair of side convex portions 33 and 35. Yes.

As described above, the lens body 25 of the present embodiment is a transmissive lens body 25 that covers the LED 23 and controls the light of the LED 23, and is disposed on the left and right, and a pair of sides that direct the light of the LED 23 to the left and right Light of the LED 23 that is provided across the convex portions 33 and 35 and the pair of side convex portions 33 and 35 on the optical axis K of the LED 23 and connects the front side surfaces of the pair of side convex portions 33 and 35. And a central convex portion 39 that gathers mainly from the vicinity of the optical axis K to the front.
According to this configuration, since the central convex portion 39 that collects the light of the LED 23 around the optical axis K is provided, the pair of side convex portions 33 and 35 are controlled at both ends of the horizontally long area EA. Then, it is possible to suppress a drop in illuminance at the center in the horizontally long area EA while irradiating with the light of the LED 23 directed to the left and right of the LED 23 to ensure sufficient illuminance. Thereby, illuminance unevenness in the horizontally long area EA can be suppressed.

Reflecting surfaces 53 and 55 that reflect light in a wide range toward the same direction as the irradiation area (area EC) of the central convex portion 39 in the front direction and the rear direction orthogonal to the left-right direction. , 57.
Thereby, the illumination intensity in the irradiation area (area EB) of the center convex part 39 can further be supplemented. Moreover, since the reflective surfaces 53, 55, and 57 are configured by a total reflection surface having an angle that totally reflects the light of the LED 23, it is possible to efficiently increase the illuminance in the area EB.

The plurality of lens bodies 25 in the lens unit 21 are arranged so that the left and right directions are parallel to each other and the front and rear directions are aligned.
This makes it possible to irradiate the same horizontally long area EA with the light controlled by each lens body 25. Therefore, by adding the light of the plurality of LEDs 23, the illuminance in the horizontally long area EA can be easily obtained. It can be secured.
Moreover, the street lamp 1 of this embodiment can illuminate a horizontally long area. For example, the horizontally long street surface 3R can be illuminated with good uniformity while suppressing unevenness in illuminance. .

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 spirit of the present invention.
For example, what is necessary is just to change suitably the number of the LED modules 13 according to a use.
FIG. 12 is a view showing another installation mode of the street lamp.
As shown in FIG. 12, when illuminating the parallel roadway 71 and the sidewalk 73, a streetlight similar to the streetlight 1 is prepared on the roadway 71, but the number of LED modules 13 is set on the narrow sidewalk 73. For example, two street lamps 80 are prepared. These street lamps 1 and 80 are attached to a common column 5 erected on the boundary between the roadway 71 and the sidewalk 73, the streetlight 1 illuminates a horizontally long irradiation area EK along the roadway 71, and the streetlight 80 uses the sidewalk 73. You may make it illuminate horizontally long irradiation area EW along.
Further, for example, in the above-described embodiment, the street lamp 1 is illustrated as an example of an outdoor installation type lighting fixture. However, the present invention is not limited thereto, and the present invention can also be applied to a security light, a road light, and a projector.
Moreover, although LED23 was illustrated as an example of a light emitting element, not only this but other light emitting elements, such as organic EL, may be sufficient.
Moreover, although the reflective surfaces 53, 55, and 57 have been described as being totally reflective surfaces, the present invention is not limited to this, and a reflective surface that reflects at least part of incident light toward the irradiation area of the central convex portion 39. If it is. Even if the reflecting surfaces 53, 55, 57 are not totally reflecting surfaces, the illuminance in the irradiation area (area EC) of the central convex portion 39 can be supplemented to increase the illuminance in the area.
In addition, the optical element is described as the lens body 25 that forms part of the lens unit 21, but the optical element does not depend on what forms part of the lens unit 21. A lens may be provided for each LED 23.
Moreover, although reflective surface 53,55,57 demonstrated as what reflects the light which goes to the back direction among the front-back directions orthogonal to the left-right direction toward the irradiation area of the center convex part 39, as needed You may reflect the light which goes to the front direction of the front-back direction toward the irradiation area of the center convex part 39. FIG.

1 Street light (lighting equipment)
21 Lens unit 23 LED (light emitting element)
25 Lens body (optical element)
32 Convex reflection part 33 Side convex part (1st convex part)
35 Side convex part (second convex part)
39 Central convex part (third convex part)
53 Reflective surface (upper)
55 Reflective surface (middle)
57 Reflective surface (bottom)
EC irradiation area (irradiation area of the third convex part)

Claims (5)

A transmissive optical element that covers the light emitting element and controls the light of the light emitting element,
First and second convex portions disposed on the left and right sides of the light emitting element , refracting the light of the light emitting element at a curved emission surface and bisecting in the left and right direction, and facing the left and right sides of the horizontally elongated irradiation area ;
A connecting portion of the first and second convex portions, wherein the curved shape of the emission surface of the first and second convex portions forms a concave shape; and
A third convex portion formed between the first and second convex portions so as to fill the recess of the connecting portion,
The light controlled by the first and second convex portions is irradiated with sufficient illuminance until reaching the left and right ends of the horizontally long irradiation area, and the light controlled by the first and second convex portions. An optical element characterized by illuminating a range centered on the optical axis of the light emitting element for which sufficient illuminance cannot be obtained with light controlled by the third convex portion .   It is provided with a reflecting surface that reflects light in a wide range toward the same direction as the irradiation area of the third convex portion in the front direction and the rear direction orthogonal to the left-right direction. The optical element according to claim 1.   The optical element according to claim 2, wherein the reflection surface is configured at an angle that totally reflects light of the light emitting element. An optical element unit comprising a plurality of optical elements according to any one of claims 1 to 3, wherein the plurality of optical elements are arranged such that the left and right directions are parallel to each other and the front and rear directions are aligned. An optical element unit characterized by comprising:   A lighting apparatus comprising: a light emitting element; and the optical element according to any one of claims 1 to 3 or the optical element unit according to claim 4, and illuminates a horizontally long area.

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