Illuminating lamp, and landing area illuminating lamp

Abstract

To make it possible to irradiate and converge light in an optional direction.SOLUTION: The present invention is directed to an illuminating lamp provided with an optical unit having a lens housed in a housing and having a lens main body part for diffusing light irradiated from a light emitting device, and a reflector plate provided between the light emitting device and the lens for reflecting light irradiated from the light emitting device. The lens main body part has a shape of a cylinder with its part cut. A first cross section as a cross section of a plane including a cylindrical shaft of the cylinder is not bent, and a second cross section as a cross section of a plane perpendicular to the cylinder shaft is bent. The cylinder shaft is extended along a first direction perpendicular to an optical shaft and a left and right direction of the optical unit. The lens main body part has a plurality of steps formed at an outer side surface so as to have a shape of Fresnel lens. The reflector plate has a first plate-shaped part and a second plate-shaped part as a pair of plate-shaped parts disposed at left and right sides of the light emitting device so as to sandwich the light emitting device. The first plate-shaped part and the second plate-shaped part are provided in the first direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lighting fixture and a landing area lighting fixture. [Background technology]

[0002] Patent Document 1 discloses an aviation marker light comprising: a lamp body; a light source arranged in the lamp body and consisting of a light-emitting diode element; and a drive circuit section which is capable of gradation control for changing the brightness of the light-emitting diode for each gradation by externally operated phase control, takes in a gradation current flowing in a connected constant current power supply line, generates a constant voltage source from the gradation current, and causes the light-emitting diode to emit light using the current obtained by the generation of the gradation current, detects the current which is varied by phase control operated by external operation, converts it into a light emission gradation signal for the light-emitting diode based on the detection result, and drives and controls the light emission of the light-emitting diode for each gradation based on the light emission gradation signal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4122607 Summary of the Invention [Problem to be solved by the invention]

[0004] The invention described in Patent Document 1 has multiple light sources and a colored reflector arranged to surround some of the multiple light sources. The colored reflector is a cylindrical double-sided reflective member that spreads out like a fan, with a small opening at the bottom and a wide opening at the top.

[0005] The invention described in Patent Document 1 is an aviation beacon light, so it needs to shine light in many directions so that the presence of the light can be easily recognized, and for that purpose a fan-shaped reflector is used. However, the invention described in Patent Document 1 cannot be applied to lighting fixtures or landing area lighting fixtures that shine strong light in any direction (for example, forward) to brightly illuminate a target area.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a lighting fixture and a landing area lighting fixture that can concentrate and irradiate light in any direction. [Means for solving the problem]

[0007] In order to solve the above problems, the illumination lamp of the present invention is an illumination lamp in which an optical unit including a light-emitting unit, a lens having a lens body portion that diffuses light irradiated from the light-emitting unit, and a reflector that is provided between the light-emitting unit and the lens and reflects the light irradiated from the light-emitting unit is provided in a housing, the lens body portion has a shape obtained by cutting out a part of a cylinder, a first cross section that is a cross section in a plane including the cylindrical axis of the cylinder is not curved, and a second cross section that is a cross section in a plane perpendicular to the cylindrical axis is curved, the cylindrical axis is along a first direction perpendicular to the optical axis of the optical unit and the left-right direction, the lens body portion has a plurality of steps formed in a Fresnel lens shape formed on its outer surface, and the reflector has a first plate-shaped portion and a second plate-shaped portion that are a pair of plate-shaped portions arranged on the left and right of the light-emitting unit so as to sandwich the light-emitting unit, and the first plate-shaped portion and the second plate-shaped portion are provided along the first direction.

[0008] The illuminating lamp according to the present invention includes a reflector having a pair of plate-like parts arranged to sandwich the left and right of the light-emitting part, and an optical unit having a lens body part having a shape obtained by cutting out a part of a cylinder, and a plurality of steps formed in a Fresnel lens shape are formed on the outer surface of the lens body part. This allows the illuminating lamp to irradiate light that has a certain degree of spread in the left and right direction perpendicular to the cylindrical axis and has a narrow width in a first direction along the cylindrical axis, i.e., it can irradiate light in a concentrated manner in any direction.

[0009] The first plate-shaped portion and the second plate-shaped portion may be inclined with respect to the optical axis such that, when viewed along the first direction, a distance in the left-right direction between the first plate-shaped portion and the second plate-shaped portion increases with increasing distance from the light-emitting portion, thereby making it possible to collect horizontal light within a range in which the first plate-shaped portion and the second plate-shaped portion are inclined with respect to the optical axis.

[0010] The light emitting device includes a substrate on which the light emitting units are provided, and a heat sink provided on the substrate, and at least two of the optical units are arranged in the left-right direction, and the heat sink may overlap all of the light emitting units when viewed along the optical axis. This allows efficient heat dissipation. In addition, by arranging four or more optical units two-dimensionally, it is possible to reduce unevenness in the light as a planar light and illuminate the object to be irradiated in an easy-to-see manner.

[0011] In order to solve the above problem, the landing zone lighting according to the present invention may be provided with, for example, a lighting lamp, and when viewed along the first direction, a line connecting the light-emitting part and the tip of the first plate-like part and a line connecting the light-emitting part and the tip of the second plate-like part may be inclined at about 35 degrees with respect to the optical axis. As a result, when the landing zone lighting is installed at a position away from the landing zone as a landing zone lighting, the horizontal spread of light can be suppressed to about ±35 degrees, and an area near the center of the landing zone can be illuminated with a predetermined illuminance. In addition, since the lens body part 25a suppresses the spread of light in the first direction to a small extent, it is possible to prevent light from entering the eyes of a crew member of an aircraft descending from above in the vertical direction. Effect of the Invention

[0012] According to the present invention, light can be concentrated and irradiated in any direction. [Brief description of the drawings]

[0013] [Figure 1] 1A and 1B are perspective views showing an outline of an illumination lamp 1, in which (A) is a view seen obliquely from the front, and (B) is a view seen obliquely from the rear. [Diagram 2] FIG. 1 is a front view showing an outline of an illumination lamp 1. [Diagram 3] FIG. 1 is a plan view showing an outline of an illumination lamp 1. [Figure 4] 2 is a front view showing an outline of the optical unit assembly 20. FIG. [Diagram 5] 1A and 1B are diagrams showing an outline of an optical unit 21, in which (A) is a perspective view and (B) is an exploded perspective view. [Figure 6] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 7] 5 is a cross-sectional view of FIG. 4 taken along line B-B. [Figure 8] These are light distribution curves showing the distribution of light from lighting fixture 1. (A) is the horizontal light distribution, and (B) is the vertical light distribution. [Figure 9] 1A and 1B are perspective views showing an outline of an illumination lamp 1A, in which (A) is a view seen obliquely from the front, and (B) is a view seen obliquely from the rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The present invention relates to a lighting device. A lighting device is a lighting device for illuminating, for example, an emergency landing and takeoff site, an emergency rescue space, a heliport, a road, a square, a sports facility, etc. A lighting device irradiates a strong light in any direction to brightly illuminate a target area, and is characterized by its strong directionality.

[0015] The following describes the lighting of the present invention using as an example a landing area lighting installed in an emergency takeoff and landing field, an emergency rescue space, a heliport, etc. The landing area lighting emits strong light forward. The landing area lighting is generally installed in four locations on either side of the illumination area to brightly illuminate the illumination area near the center of the emergency takeoff and landing field, etc. The landing area lighting is installed on a base or a pole.

[0016] <First embodiment> FIG. 1 is a perspective view showing a schematic of an illumination lamp 1 according to a first embodiment of the present invention, where (A) is a view from diagonally front and (B) is a view from diagonally back. FIG. 2 is a front view showing a schematic of the illumination lamp 1. FIG. 3 is a plan view (view from above) showing a schematic of the illumination lamp 1. Note that in FIG. 2, some of the internal components are shown by dotted lines. Also, in FIG. 2, some of the internal components are shown in perspective.

[0017] The illumination lamp 1 mainly comprises a housing 10, an optical unit assembly 20, and a heat sink 30. The housing 10 is box-shaped and hollow inside. The optical unit assembly 20 is provided inside the housing 10. The housing 10 mainly has a lid portion 11 and a main body portion 12, and the lid portion 11 is provided so as to be openable and closable relative to the main body portion 12. When the lid portion 11 is opened, the optical unit assembly 20 provided inside the main body portion 12 is exposed.

[0018] A transparent window 13 is provided on the front surface 11a of the cover 11 to transmit light emitted from the optical unit assembly 20. In addition, a hole 12b is provided on the back surface 12a of the main body 12 through which a part of the optical unit assembly 20 is exposed.

[0019] Hereinafter, the two directions along the front surface 11a and the rear surface 12a are referred to as the x direction and the y direction. The direction perpendicular to the front surface 11a and the rear surface 12a is referred to as the z direction. Therefore, the optical axis of the optical unit assembly 20 is along the z direction, and the direction in which light travels on the optical axis is referred to as the +z direction. The x direction is the left-right direction, and the y direction (corresponding to the first direction of the present invention) is the up-down direction. In this embodiment, the x direction is the horizontal direction, but the x direction is not limited to being horizontal.

[0020] The housing 10 is rotatably mounted on a base 19. In addition, in Figures 1 to 3, the front surface 11a and the back surface 12a are shown aligned along the horizontal and vertical directions, and the y direction is aligned along the vertical direction. By rotating the housing 10, the y direction is inclined with respect to the vertical direction.

[0021] 4 is a front view (viewed from the +z direction) showing an outline of the optical unit assembly 20. The optical unit assembly 20 mainly has a plurality of optical units 21 and a substrate 22. An optical unit is an assembly including optical elements such as a light source and a lens.

[0022] A plurality of optical units 21 are provided on the substrate 22. The illuminating lamp 1 has 12 optical units 21. The 12 optical units 21 are two-dimensionally arranged along the x direction and the y direction.

[0023] The optical unit 21 mainly includes a light emitting portion 23, a reflector 24, and a lens 25. The optical unit 21 is provided on a substrate 22. The substrate 22 is flat and made of a metal having excellent thermal conductivity. The optical unit 21 will be described in detail later.

[0024] 1 to 3. Light emitted from the optical unit 21 (light emitting section 23) is emitted to the outside of the illuminating lamp 1 through the window section 13.

[0025] The substrate 22 is fixed to the rear surface 12a (main body portion 12) by screws or the like. A hole 12b is provided in the rear surface 12a, and the substrate 22 is exposed through the hole 12b. A heat sink 30 is provided on the portion of the substrate 22 exposed from the hole 12b. When the substrate 22 and the heat sink 30 come into contact with each other, heat generated in the optical unit 21 is dissipated by the heat sink 30.

[0026] When viewed from the z direction (viewed along the optical axis ax), the heat sink 30 overlaps with all of the light emitting sections 23 of the multiple optical units 21 (see FIG. 4). Therefore, heat from all of the optical units 21 is efficiently dissipated by the heat sink 30. The heat sink 30 has multiple fins 31 to dissipate heat without using a fan or the like.

[0027] FIG. 5 is a diagram showing an outline of the optical unit 21, where (A) is a perspective view and (B) is an exploded perspective view.

[0028] The light-emitting unit 23 is provided (mounted) on the substrate 22. Only one light-emitting unit 23 is provided in the optical unit 21. The light-emitting unit 23 is a point light source, for example, a power LED. Note that the light-emitting unit 23 is not limited to one power LED, and may be a light source in which multiple LEDs are arranged closely together.

[0029] The reflector 24 is provided between the light-emitting unit 23 and the lens 25, and reflects the light emitted from the light-emitting unit 23. The reflector 24 has a fixed portion 24a and plate-shaped portions 24b and 24c (corresponding to a first plate-shaped portion and a second plate-shaped portion of the present invention). The fixed portion 24a is plate-shaped and is fixed to the substrate 22 by a screw or the like. A hole 24d into which the light-emitting unit 23 is inserted is formed in the fixed portion 24a.

[0030] The plate-shaped portions 24b and 24c are plate-shaped (here, flat) members. The plate-shaped portions 24b and 24c are a pair of plate-shaped portions arranged on both the left and right sides (both sides in the x direction) of the light-emitting portion 23 so as to sandwich the light-emitting portion 23. The plate-shaped portions 24b and 24c are provided along the y direction. Furthermore, the plate-shaped portions 24b and 24c are inclined with respect to a plane F that is parallel to the z direction and includes the optical axis ax. The plate-shaped portions 24b and 24c will be described in detail later.

[0031] The lens 25 has a lens body 25a that diffuses the light emitted from the light emitting unit 23. The lens body 25a has a shape obtained by cutting out a part of a cylinder. A surface obtained by cutting out a part of a cylinder, that is, a cylindrical surface, is a surface in which a cross section including a cylinder axis c is a straight line, and a cross section perpendicular to the cylinder axis c is an arc. The cylinder axis c is along the y direction. Planar end faces 25b, 25c are provided on both ends of the lens body 25a. The lens body 25a will be described in detail later.

[0032] Fig. 6 is a cross-sectional view taken along line AA in Fig. 4, and Fig. 7 is a cross-sectional view taken along line BB in Fig. 4. In Fig. 6, the optical unit 21 and the substrate 22 are viewed along the y direction (here, from the +y direction to the -y direction). In Fig. 7, the optical unit 21 and the substrate 22 are viewed along the x direction (here, from the +x direction to the -x direction). In Figs. 6 and 7, part of the path of light is indicated by an arrow.

[0033] As shown in FIG. 6, when viewed along the y direction, the plate-shaped portions 24b and 24c are inclined with respect to the plane F, i.e., the optical axis. Also, when viewed along the y direction, the distance in the x direction between the plate-shaped portions 24b and 24c increases with increasing distance from the light-emitting portion 23. The light irradiated from the light-emitting portion 23 is reflected by the plate-shaped portion 24b or the plate-shaped portion 24c, and the direction in which the light travels changes. This prevents the light irradiated from the light-emitting portion 23 from spreading outward in the horizontal direction (x direction), and allows the light to be irradiated in a concentrated manner forward (+z direction).

[0034] When viewed along the y direction, a line L connecting the tip of the plate-shaped portion 24b and the light-emitting portion 23 is inclined at an angle θ with respect to the plane F (optical axis ax). Similarly, a line connecting the tip of the plate-shaped portion 24c and the light-emitting portion 23 is inclined at an angle θ with respect to the plane F (optical axis ax). Note that the tips of the plate-shaped portions 24b and 24c are the ends furthest forward (in the +z direction) from the fixed portion 24a, which is the base side.

[0035] In this embodiment, the angle θ is approximately 35 degrees. This allows the spread of the light emitted from the light-emitting unit 23 to be within a range of approximately 35 degrees on both sides of the optical axis ax. Note that approximately 35 degrees does not necessarily mean 35 degrees exactly, but is a concept that includes an error of several degrees.

[0036] The landing area lighting should be installed in a position that does not interfere with the navigation of aircraft, i.e., away from the landing area, and should illuminate the center of the landing area with a specified illuminance. Therefore, when using the lighting 1 as a landing area lighting, it is preferable that the spread of the light emitted from the light-emitting unit 23, i.e., the angle θ between the line L and the plane F (optical axis ax), is approximately 35 degrees.

[0037] The end surface 25c is attached to the substrate 22 via the attachment member 26, whereby the lens 25 is attached to the substrate 22. However, the method of attaching the lens 25 is not limited to this.

[0038] The lens body 25a has a so-called cylindrical surface. As shown in Fig. 6, the cross section of the lens body 25a in a plane perpendicular to the cylinder axis c (corresponding to the second cross section of the present invention, see Fig. 6) is curved and has an arc shape.

[0039] As shown in Fig. 7, the cross section of the lens body 25a in the plane including the cylinder axis c (corresponding to the first cross section of the present invention) is not curved but linear. In addition, the outer surface 25d of the lens body 25a has a plurality of steps formed in a Fresnel lens shape. A Fresnel lens is a lens in which the lens surface is divided into approximately concentric regions, cut into slits, and cut into a sawtooth cross-sectional shape. This makes it possible to reduce the size and thickness of the lens body 25a.

[0040] Light emitting unit 23 is disposed at the focal position of lens body 25a, i.e., the Fresnel lens formed on surface 25d. Therefore, when viewed in the x direction (see FIG. 7), lens body 25a narrows the light irradiated from light emitting unit 23 and spreading in the vertical direction (y direction), and converts it into parallel light.

[0041] The plate-like portions 24b and 24c reflect the light incident on the lens body portion 25a to prevent the light irradiated from the light emitting portion 23 from spreading outward (x direction). The length in the y direction of the plate-like portions 24b and 24c is shorter than the length in the y direction of the lens body portion 25a, and reflect only the light incident on the lens body portion 25a. Therefore, the lens body portion 25a converts all the light incident on the lens body portion 25a into parallel light parallel to the z direction (optical axis direction).

[0042] It should be noted that the length of the plate-like portions 24b, 24c in the y direction is not limited to this. For example, the length of the plate-like portions 24b, 24c in the y direction and the length of the lens main body portion 25a in the y direction may be substantially the same.

[0043] FIG. 8 shows light distribution curves that represent the distribution of light from the illumination lamp 1, with (A) being the horizontal light distribution (the curve showing the distribution of light in the x direction) and (B) being the vertical light distribution (the curve showing the distribution of light in the y direction). In FIG. 8, the luminous intensity at 0° is the luminous intensity on the optical axis ax. FIG. 8(A) shows the luminous intensity on a line inclined by 5 degrees, 10 degrees, and so on in the x direction with respect to the optical axis ax, and FIG. 8(B) shows the luminous intensity on a line inclined by 5 degrees, 10 degrees, and so on in the y direction with respect to the optical axis ax.

[0044] Since the plate-like portions 24b and 24c reflect the light spreading in the x direction, the illuminating lamp 1 has a mountain-shaped horizontal light distribution in which the light is strong within a certain angle range and the light outside of that range is weak, as shown in Fig. 8(A). In particular, the angle θ between the line L and the optical axis ax is approximately 35 degrees, and the luminous intensity drops sharply near 35° in the horizontal light distribution, which shows that the light is concentrated within the range of the inclination angle of the line L with respect to the optical axis ax.

[0045] Since the light emitted from the light-emitting unit 23 and spreading in the vertical direction (y direction) is concentrated by the lens body unit 25a, the illuminating lamp 1 has a mountain-shaped vertical light distribution in which the luminous intensity is highest at 0° and drops sharply as it inclines in the y direction, as shown in Fig. 8(B). In particular, the luminous intensity is nearly 0 within a range of ±10 degrees in the y direction, and the vertical light distribution shows that the light does not spread in the y direction.

[0046] According to this embodiment, by inclining the plate-like portions 24b and 24c with respect to the plane F (optical axis ax), it is possible to collect horizontal light within the range of the inclination angle θ. In addition, the lens body portion 25a can reduce the spread of light in the y direction. Therefore, the illuminating lamp 1 can irradiate light in a concentrated manner near the front.

[0047] Furthermore, according to this embodiment, when the lighting lamp 1 is installed as a landing area lighting lamp at a position away from the landing area, the inclination angle of the line L with respect to the optical axis ax is set to 35°, thereby limiting the horizontal spread of light to approximately ±35°, and making it possible to illuminate the area near the center of the landing area with a predetermined illuminance.

[0048] Furthermore, according to this embodiment, the spread of light in the y direction is kept small by the lens main body portion 25a, for example, to within ±10°, so that when the lighting lamp 1 is used as a landing area lighting lamp, light can be prevented from entering the eyes of crew members of an aircraft descending from above in the vertical direction.

[0049] For example, if the spread of light in the y direction cannot be suppressed, it is necessary to provide a hood, louvers, etc. on the top of the housing 10 to block the light in the +y direction. In contrast, in an illuminating lamp 1 in which light does not spread in the y direction, there is no need to block the light in the +y direction, and therefore no hood, louvers, etc. are required. In addition, hoods, louvers, etc. are easily affected by wind and can be damaged in strong winds, so by eliminating the hood, louvers, etc., the illuminating lamp 1 can be made less susceptible to the effects of wind.

[0050] Furthermore, according to this embodiment, since it has multiple (here, 12) optical units 21 arranged two-dimensionally along the x and y directions, it is possible to reduce unevenness in the light as a planar light and illuminate the object to be illuminated in an easily visible manner.

[0051] Furthermore, according to this embodiment, by providing a plurality of optical units 21, the heat source is dispersed and the heat sink 30 is made larger, so that the heat dissipation efficiency can be increased. Therefore, heat can be dissipated without providing a fan. Therefore, it is possible to miniaturize the device, simplify the configuration, and reduce power consumption.

[0052] In the present embodiment, the plate-shaped portions 24b and 24c are flat, but the plate-shaped portions 24b and 24c do not have to be flat. For example, the plate-shaped portions 24b and 24c may have curved surfaces.

[0053] Furthermore, in this embodiment, a plurality of (here, 12) optical units 21 are provided, but the number of optical units 21 is not limited to this. For example, the number of optical units 21 may be one. Furthermore, when a plurality of optical units 21 are provided, at least two optical units 21 should be provided. When an illumination lamp has two optical units 21, two optical units 21 should be arranged along the x direction to narrow the light in the y direction.

[0054] Furthermore, in this embodiment, the heat sink 30 is used, but the heat sink 30 is not essential. For example, when only one optical unit 21 is used, heat may be dissipated by blowing air toward the optical unit 21 with fins or the like. However, using the heat sink 30 can simplify the configuration and reduce power consumption, so it is desirable to use the heat sink 30.

[0055] In this embodiment, the illuminating lamp 1 is a landing area illuminating lamp, and the inclination angle θ of the line L with respect to the optical axis ax is set to 35 degrees, but the inclination angle θ of the line L with respect to the optical axis ax is not limited to 35 degrees. For example, in the case of an illuminating lamp for illuminating a signboard or the like, the inclination angle θ of the line L with respect to the optical axis ax may be large, such as about 45 degrees. Also, for example, the plate-like portions 24b and 24c may be substantially parallel to the surface F.

[0056] In addition, in this embodiment, a hood is not used, but a hood 18 may be provided as in the illuminating lamp 1A shown in Fig. 9. This makes it possible to more reliably prevent the light from being irradiated upward. The illuminating lamp 1A is the same as the illuminating lamp 1 except that it has a hood 18.

[0057] Although the embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes within the scope of the present invention are also included. In the present invention, "approximately" is a concept that includes some errors and deformations. For example, "approximately the same" is a concept that includes not only cases where it is strictly the same, but also errors and deformations to the extent that the identity is not lost. In the present invention, "nearby" means including a certain range (which can be arbitrarily determined) near a reference position. For example, in the case of "near the end," it is a concept that indicates a certain range near the end, which may or may not include the end. [Explanation of symbols]

[0058] 1, 1A: Lighting 10: Housing 11: Lid part 11a:Front 12: Main body 12a: Back 12b:hole 13: Window section 18: Food 19: Foundation 20: Optical unit assembly 21: Optical unit 22: Substrate 23: Light emitting part 24:Reflector 24a: Fixed part 24b, 24c: Plate-shaped portion 24d: Hole 25: Lens 25a: Lens body 25b, 25c: End surface 25d: face 26: Mounting material 30: Heat sink 31: Finn

Claims

1. A light emitting portion; a lens having a lens body portion that diffuses light irradiated from the light emitting portion; a reflector provided between the light emitting unit and the lens, the reflector reflecting the light irradiated from the light emitting unit; An illumination lamp having an optical unit provided in a housing, the lens body portion has a shape obtained by cutting out a part of a cylinder, a first cross section which is a cross section in a plane including a cylindrical axis of the cylinder is not curved, and a second cross section which is a cross section in a plane perpendicular to the cylindrical axis is curved, the cylinder axis is aligned along a first direction perpendicular to the optical axis of the optical unit and the left-right direction, The lens body has a Fresnel lens-shaped step formed on an outer surface thereof, the reflector includes a pair of plate-shaped portions, a first plate-shaped portion and a second plate-shaped portion, disposed on the left and right sides of the light-emitting portion so as to sandwich the light-emitting portion therebetween; The first plate-shaped portion and the second plate-shaped portion are provided along the first direction. A lighting fixture characterized by:

2. The first plate-shaped portion and the second plate-shaped portion are inclined with respect to the optical axis such that, when viewed along the first direction, a distance in a left-right direction between the first plate-shaped portion and the second plate-shaped portion increases with increasing distance from the light-emitting portion.

2. The lighting device according to claim 1 .

3. A substrate on which the light emitting portion is provided; a heat sink provided on the substrate; At least two of the optical units are arranged in the left-right direction, When viewed along the optical axis, the heat sink overlaps all of the light emitting portions.

3. The lighting device according to claim 1 or 2.

4. The lighting device according to claim 2, When viewed along the first direction, a line connecting the light-emitting portion and the tip of the first plate-shaped portion, and a line connecting the light-emitting portion and the tip of the second plate-shaped portion are each inclined at approximately 35 degrees with respect to the optical axis. A landing area lighting system characterized by:

Images