Lighting equipment

Abstract

To provide a lighting device that can inhibit uncontrolled light which cannot be controlled by a lens from being emitted on an upper side of an optical axis of a lighting device.SOLUTION: A lighting device 1 emits illumination light. The lighting device 1 includes a light-emitting device 21a, a lens 261 and a light shielding plate 25. The lens 261 is disposed while being opposed to the light-emitting device 21a. The light shielding plate 25 partially shields light emitted from the light-emitting device 21a while being transmitted through the lens 261 so that a luminous intensity of light emitted on an upper side by 15 degrees from an optical axis of the lighting device 1 out of illumination light becomes smaller than a luminous intensity of light emitted on a lower side by 15 degrees from the optical axis.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a lighting device, and more particularly, to a lighting device suitable for use in flood lighting. [Background technology]

[0002] The lighting fixture described in Patent Document 1 includes an LED module and two lens blocks. The two lens blocks are disposed in front of the LED module. In this lighting device, the light emitted from the LED module passes through the two lens blocks in order and is emitted to the front of the lighting fixture. At that time, the two lens blocks prevent the light emitted from the LED module from being emitted above the optical axis of the lighting device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-045619 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the lighting device described in Patent Document 1, uncontrolled light that cannot be controlled by the lenses (two lens blocks) may be emitted above the optical axis of the lighting device.

[0005] An object of the present invention is to provide an illumination device that can prevent uncontrolled light that cannot be controlled by a lens from being emitted above the optical axis of the illumination device. [Means for solving the problem]

[0006] An illumination device according to one aspect of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, and a light-shielding member. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light that passes through the lens from the light-emitting element so that the luminous intensity of light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis. The light-shielding member is disposed on the emission surface side of the lens. The light blocking member has an opening that faces the light exit surface of the lens, and an upper end of the opening is located below an upper end of the light exit surface of the lens, and a lower end of the opening is located above a lower end of the light exit surface of the lens. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, a light-shielding member, and a second lens. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light emitted from the light-emitting element through the lens so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite to the emission surface of a first lens, which is the lens. The light-shielding member includes at least one of a first light-shielding member and a second light-shielding member. The first light-shielding member is disposed between the first lens and the second lens. The first light-shielding member has a first opening that partially transmits the light emitted from the first lens. The second light-shielding member is disposed on the emission surface side of the second lens. The second light blocking member has a second opening that partially transmits the light emitted from the second lens. The light blocking member has the second light blocking member. In the up-down direction, the second opening is smaller than the light exit surface of the second lens. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, a light-shielding member, and a second lens. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light emitted from the light-emitting element through the lens so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite to the emission surface of a first lens, which is the lens. The light-shielding member includes at least one of a first light-shielding member and a second light-shielding member. The first light-shielding member is disposed between the first lens and the second lens. The first light-shielding member has a first opening that partially transmits the light emitted from the first lens. The second light-shielding member is disposed on the emission surface side of the second lens. The second light blocking member has a second opening that partially transmits the light emitted from the second lens. The light blocking member has the first light blocking member and the second light blocking member. In the up-down direction, the first opening is larger than the second opening. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, a light-shielding member, and a second lens. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light emitted from the light-emitting element through the lens so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite to the emission surface of a first lens, which is the lens. The light-shielding member includes at least one of a first light-shielding member and a second light-shielding member. The first light-shielding member is disposed between the first lens and the second lens. The first light-shielding member has a first opening that partially transmits the light emitted from the first lens. The second light-shielding member is disposed on the emission surface side of the second lens. The second light-shielding member has a second opening that partially transmits light emitted from the second lens. The light-emitting element, the first lens, and the second lens are each provided in a plurality of positions aligned in a lateral direction of the lighting device. The light-shielding member has the first light-shielding member. The first opening is a slit that extends in the lateral direction and faces the plurality of first lenses aligned in the lateral direction. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, a light-shielding member, and a second lens. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light emitted from the light-emitting element through the lens so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite to the emission surface of a first lens, which is the lens. The light-shielding member includes at least one of a first light-shielding member and a second light-shielding member. The first light-shielding member is disposed between the first lens and the second lens. The first light-shielding member has a first opening that partially transmits the light emitted from the first lens. The second light-shielding member is disposed on the emission surface side of the second lens. The second light-shielding member has a second opening that partially transmits light emitted from the second lens. The light-emitting element, the first lens, and the second lens are each provided in a plurality of positions aligned in a lateral direction of the lighting device. The light-shielding member has the second light-shielding member. The second opening is a slit that extends in the lateral direction and is disposed opposite the second lenses aligned in the lateral direction. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a lens, a light-shielding member, and a second lens. The lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light emitted from the light-emitting element through the lens so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite to the emission surface of a first lens, which is the lens. The light-shielding member includes at least one of a first light-shielding member and a second light-shielding member. The first light-shielding member is disposed between the first lens and the second lens. The first light-shielding member has a first opening that partially transmits the light emitted from the first lens. The second light-shielding member is disposed on the emission surface side of the second lens. The second light-shielding member has a second opening that partially transmits the light emitted from the second lens. The light-emitting element, the first lens, and the second lens are each provided in a plurality of rows aligned in the horizontal and vertical directions of the lighting device. The light-shielding member has the first light-shielding member and the second light-shielding member. The first opening is a slit extending in one of the horizontal and vertical directions and arranged opposite the first lenses arranged in the one direction. The second opening is a slit extending in the other of the horizontal and vertical directions and arranged opposite the second lenses arranged in the other direction. An illumination device according to an embodiment of the present disclosure is an illumination device that emits illumination light. The illumination device includes a light-emitting element, a first lens, a light-shielding member, and a second lens. The first lens is disposed opposite the light-emitting element. The light-shielding member partially blocks light that passes through the first lens and is emitted from the light-emitting element so that the luminous intensity of the light emitted 15 degrees above the optical axis of the illumination device is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis. The second lens is disposed opposite the emission surface of the first lens. The light-shielding member is disposed on the emission surface side of the second lens and has a second opening that partially transmits the emitted light from the second lens. Effect of the Invention

[0007] According to the present disclosure, it is possible to prevent uncontrolled light that cannot be controlled by a lens from being emitted above the optical axis of the lighting device. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a lighting device according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing a lighting unit of the lighting device. [Diagram 3] FIG. 3 is an exploded perspective view showing the lighting unit of the above embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line X1-X1 of FIG. [Diagram 5] FIG. 5 is an enlarged view of the main part of FIG. [Figure 6] FIG. 6 is an explanatory diagram illustrating how emitted light from a light-emitting element propagates. [Figure 7] FIG. 7 is an explanatory diagram illustrating the light distribution characteristics of the illumination light of the illumination device. [Figure 8] FIG. 8 is a cross-sectional view of a main part of an illumination device according to the first modification. [Figure 9] FIG. 9 is a perspective view showing a light blocking plate of an illumination device according to the second modification. [Figure 10] FIG. 10 is a perspective view showing a light blocking plate of an illumination device according to the third modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Embodiment) (Overall composition) The lighting device 1 according to the present embodiment will be described in detail with reference to the drawings. The lighting device 1 is a floodlight used for illuminating (floodlighting) various athletic fields (such as soccer stadiums), school playgrounds, or parking lots, for example. The configuration described in this embodiment is merely one example of the present disclosure. The present disclosure is not limited to this embodiment, and various modifications can be made according to the design, etc., within the scope of the technical idea of ​​the present disclosure.

[0010] In the following description, unless otherwise specified, the front-rear, left-right, and up-down directions of the lighting device 1 are defined in Fig. 1. That is, the cover 3 side of the lighting device 1 is the front, and the heat sink 6 side of the lighting device 1 is the rear. In addition, when viewed from the front of the lighting device 1, the upper side is the upper side, the lower side is the lower side, the left side is the left, and the right side is the right.

[0011] As shown in FIG. 1, the lighting device 1 includes a lighting device main body 102, a fixing member 103, a support member 104, a power supply box 105, and a wiring box 106.

[0012] The lighting device body 102 emits illumination light C10 (see FIG. 4). The lighting device body 102 includes a plurality of (e.g., two) lighting units SU1 and a pair of left and right connectors 107. The plurality of lighting units SU1 emit illumination light C10. The pair of left and right connectors 107 connect the plurality of lighting units SU1 in a vertically aligned state. The pair of left and right connectors 107 connect the right ends and the left ends of the plurality of lighting units SU1.

[0013] The fixing member 103 fixes the power supply box 105 to the back side of the lighting device main body 102. The fixing member 103 is attached across a pair of left and right connecting parts 107. The fixing member 103 is disposed so as to wrap around from the pair of left and right connecting parts 107 to the rear side of the lighting device main body 102.

[0014] When installed at a predetermined location such as a stadium, the support member 104 supports the lighting device main body 102 rotatably about a rotation axis RG1 extending in the left-right direction. The support member 104 is attached across a pair of left and right connecting parts 107. The support member 104 is disposed so as to wrap around from the pair of left and right connecting parts 107 to the lower rear side of the lighting device main body 102.

[0015] The power supply box 105 is a part including a power supply circuit that converts AC power supplied via the wiring box 106 into DC power and supplies the DC power to the lighting device main body 102. The power supply box 105 is fixed to the rear side of the lighting device main body 102 by a fixing member 103.

[0016] The wiring box 106 is a part to which a power line from an external AC power source (for example, a system power source) is connected. The wiring box 106 supplies AC power supplied from the external AC power source to the above-mentioned power supply circuit. The wiring box 106 is fixed to the rear side of the power supply box 105.

[0017] In this lighting device 1, illumination light C10 is emitted forward from the front side of the lighting device body 102. The illumination light C10 is mainly emitted in the direction of an optical axis CG1 of the lighting device 1. The optical axis CG1 is parallel to a normal to a front surface 102a of the lighting device body 102. The front surface 102a is the front surface of a cover 3 (see FIG. 2) of the lighting unit SU1, which will be described later. In this lighting device 1, the lighting device body 102 is rotated around a rotation axis RG1, so that the emission direction of the illumination light C10 (direction of the optical axis CG1) can be changed in the vertical direction. For example, this lighting device 1 is installed in a relatively high place, and emits illumination light C10 from above in an obliquely downward direction to illuminate, for example, the grounds of a stadium.

[0018] In this lighting device 1, the illumination light C10 is distributed so that the luminous intensity of the light emitted above the optical axis CG1 (for example, 15 degrees) is smaller than the luminous intensity of the light emitted below the optical axis CG1 (for example, 15 degrees). This makes it possible to prevent the illumination light C10 from reaching farther than necessary. In addition, the illumination light C10 is distributed so that the luminous intensity of the light emitted above the optical axis CG1 is ensured to a certain degree (for example, a degree of luminous intensity that allows the ball to be seen when it flies above the ground at night).

[0019] (Lighting unit) The lighting unit SU1 includes a light source unit 2, a cover 3, a waterproof packing 4, a pressing member 5, and a heat sink 6, as shown in FIGS.

[0020] The light source unit 2 constitutes a light source of the lighting device 1. The light source unit 2 is disposed on the front surface 61s of the heat sink 6. The light source unit 2 includes a light emitting module 21, a thermally conductive sheet 23, and a light distribution member 24. The light distribution member 24 is composed of two lens blocks (a first lens block 26 and a second lens block 27) and a light shielding plate 25 (light shielding member).

[0021] The light emitting module 21 includes a plurality of light emitting elements 21a and a circuit board 21b.

[0022] Each light-emitting element 21a is, for example, a white light-emitting diode that emits white light to be the illumination light C10. The circuit board 21b is, for example, a rectangular flat plate. The light-emitting elements 21a are provided on the front surface of the circuit board 21b and are electrically connected by wiring conductors formed on the front surface of the circuit board 21b. The light-emitting elements 21a are arranged vertically and horizontally on the front surface of the circuit board 21b.

[0023] The light-emitting module 21 is fixed to the front surface 61s of the heat sink 6 via the thermally conductive sheet 23. In this embodiment, the light-emitting module 21 is fixed to the heat sink 6 by screws in a state where a plurality of fixing pieces are overlapped with a plurality of points on the periphery of the circuit board 21b. In this manner, the periphery of the circuit board 21b is sandwiched between the fixing pieces and the heat sink 6, whereby the light-emitting module 21 is fixed to the front surface 61s of the heat sink 6.

[0024] The thermally conductive sheet 23 is a member for efficiently conducting heat generated in the light-emitting module 21 from the circuit board 21b to the heat sink 6. The thermally conductive sheet 23 is disposed by being sandwiched between the light-emitting module 21 and the heat sink 6. The thermally conductive sheet 23 is formed, for example, in a rectangular sheet shape. The planar size of the thermally conductive sheet 23 is approximately the same as the planar size of the light-emitting module 21. The thermally conductive sheet 23 is formed of a member having electrical insulation and thermal conductivity (for example, an elastomer material, silicone gel, or an acrylic resin containing a filler).

[0025] The light distribution member 24 is a member that controls the distribution of light emitted from the light emitting element 21a. Through this control, the luminous intensity of the light emitted to the upper side of the optical axis CG1 of the lighting device 1 is controlled to be smaller than the luminous intensity of the light emitted to the lower side of the optical axis CG1. The light distribution member 24 is disposed on the front side of the light emitting module 21 (i.e., facing the light emitting module 21). As described above, the light distribution member 24 has two lens blocks (the first lens block 26 and the second lens block 27) and the light shielding plate 25. Note that, in this embodiment, two lens blocks are provided, but the number of lens blocks may be one or three or more. The first lens block 26 is disposed facing the front surface of the light emitting module 21. The second lens block 27 is disposed facing the emission surface of the first lens block 26. The light shielding plate 25 is disposed facing the emission surface of the second lens block 27.

[0026] The first lens block 26 has a plurality of first lenses 261 and a first connecting portion 262. The plurality of first lenses 261 and the first connecting portion 262 are integrally formed from a synthetic resin having light transmission properties such as an acrylic resin (for example, polycarbonate or ABS resin).

[0027] The first lens 261 collects light emitted by the light-emitting element 21a. The first lenses 2611 correspond one-to-one to the light-emitting elements 21a and are arranged facing the front side of the corresponding light-emitting element 21a. The first lens 261 has an incident surface 261h and an exit surface 261i. The first lens 261 receives light emitted by the corresponding light-emitting element 21a from the incident surface 261h, transmits the light through the inside of the first lens 261, and exits from the exit surface 261i. The specific shape of the first lens 261 will be described later.

[0028] The first connecting portion 262 connects the first lenses 261. The first connecting portion 262 is, for example, a rectangular plate. The first lenses 261 are connected to the first connecting portion 262 in a state in which they penetrate the first connecting portion 262 in the thickness direction. In other words, the first lenses 261 are connected to the first connecting portion 262 such that their front half protrudes forward from the front surface of the first connecting portion 262 and their rear half protrudes backward from the rear surface of the first connecting portion 262. The first connecting portion 262 is fixed to the heat sink 6 via the support members 28 (see FIG. 4) so ​​that the first lens block 26 is disposed on the front side of the heat sink 6. In this fixed state, the first lens block 26 is disposed on the front side of the light emitting module 21 fixed to the front surface 61s of the heat sink 6.

[0029] The second lens block 27 has a plurality of second lenses 271 and a second connecting portion 272. The plurality of second lenses 271 and the second connecting portion 272 are integrally formed from a synthetic resin having light-transmitting properties, such as an acrylic resin or a polycarbonate resin.

[0030] The second lens 271 collects the light emitted by the first lens 261. The second lenses 271 correspond one-to-one to the first lenses 261, and are arranged at intervals facing the emission surfaces of the corresponding first lenses 261. The second lenses 271 cause the light emitted by the corresponding first lenses 261 to enter the second lens 271 from the rear surface (incident surface) of the second lens 271, and emit the light from the front surface (exit surface) of the second lens 271. The specific shape of the second lens 271 will be described later.

[0031] The second connecting portion 272 connects the plurality of second lenses 271. The second connecting portion 272 is, for example, a rectangular plate. The second lenses 271 are connected to the second connecting portion 272 in a state in which they penetrate the second connecting portion 272 in the thickness direction. In other words, the second lenses 271 are connected to the second connecting portion 272 such that a front half of the second lens 271 protrudes forward from the front surface of the second connecting portion 272 and a rear half of the second lens 271 protrudes backward from the rear surface of the second connecting portion 272.

[0032] The second connecting portion 272 is fixed to the first connecting portion 262 of the first lens block 26 via a plurality of support members 29 (see FIG. 4). As a result, the second lens block 27 is fixed to the front side of the first lens block 26 with a predetermined gap therebetween.

[0033] The light shielding plate 25 is a member that prevents light that cannot be controlled by the lenses (uncontrolled light) from being emitted above the optical axis CG1 of the lighting device 1, out of the light that is emitted from the light-emitting module 21 through the lenses (first lens 261 and second lens 271).

[0034] The light shielding plate 25 is, for example, a rectangular plate. The light shielding plate 25 has a plurality of openings 25a. The plurality of openings 25a face the plurality of second lenses 271 in a one-to-one relationship, and are disposed in the light shielding plate 25 at positions facing the corresponding second lenses 271. The openings 25a partially transmit light emitted from the second lenses 271. The light shielding plate 25 is disposed in front of the second lens block 27. More specifically, the light shielding plate 25 is fixed to the second connecting portion 272 of the second lens block 27 via a plurality of support members 36 (see FIG. 4).

[0035] The heat sink 6 is a member that dissipates heat generated in the light emitting module 21 to the outside. The heat sink 6 is formed of a member having thermal conductivity (for example, a metal, specifically, for example, aluminum or an aluminum alloy). The heat sink 6 has a base portion 61 and a plurality of heat dissipation fins 62. The base portion 61 and the plurality of heat dissipation fins 62 are integrally formed. The base portion 61 is, for example, a rectangular flat plate. The base portion 61 has a front surface 61s and a rear surface 61k. The rear surface 61k is a main surface opposite to the front surface 61s. Each heat dissipation fin 62 is, for example, formed in a rectangular thin plate shape. The plurality of heat dissipation fins 62 protrude rearward from the rear surface 61k of the base portion 61. The plurality of heat dissipation fins 62 are arranged at intervals from each other with their thickness directions aligned in the left-right direction.

[0036] The cover 3 is a member that covers the light source unit 2. The cover 3 is in the shape of a substantially rectangular parallelepiped box with an opening at the rear. The cover 3 is fixed to the front surface 61s of the heat sink 6. The cover 3 is formed of a resin material (e.g., acrylic resin or polycarbonate resin) that has translucency that transmits the light emitted from the light emitting element 21a. This allows the light emitted from the light source unit 2 to transmit through. The cover 3 has a cover body 31 and a flange portion 32. The cover body 31 and the flange portion 32 are integrally formed. The cover body 31 is formed in the shape of a substantially rectangular parallelepiped box with an opening at the rear. The flange portion 32 protrudes outward from the periphery of the rear opening of the cover body 31 over the entire circumference. The flange portion 32 is formed in the shape of a rectangular frame that is substantially the same shape and size as the front surface 61s and the periphery of the heat sink 6 (see FIG. 3).

[0037] The pressing member 5 is a member that fixes the cover 3 to the front surface 61s of the heat sink 6. The pressing member 5 is a rectangular frame having a size approximately equal to that of the flange 32 of the cover 3 (see FIG. 3). The pressing member 5 is formed of a metal plate (e.g., a stainless steel plate). The pressing member 5 is fixed to the front surface 61s of the heat sink 6 with screws or the like, with the flange 32 of the cover 3 sandwiched between the pressing member 5 and the periphery of the front surface 61s of the heat sink 6 (see FIG. 4).

[0038] The waterproof packing 4 is a member that seals the gap between the flange 32 of the cover 3 and the heat sink 6, and between the flange 32 of the cover 3 and the pressing member 5. The waterproof packing 4 is formed into a rectangular frame shape and made of an electrically insulating elastic material (e.g., silicone rubber). The waterproof packing 4 is disposed between the flange 32 of the cover 3 and the heat sink 6, and between the flange 32 of the cover 3 and the pressing member 5 (see FIG. 4).

[0039] (Details of the first lens, second lens and light shield) Next, the shapes of the first lens 261 and the second lens 271, and the arrangement of the light blocking plate 25 will be described in detail with reference to FIG.

[0040] In the following description, the optical axis of the first lens 261 is defined as the optical axis G1, the optical axis of the second lens 271 as the optical axis G2, and the optical axis of the light-emitting element 21a as the optical axis G3. The optical axes G1 to G3 are fixed to the first lens 261, the second lens 271, and the light-emitting element 21a, respectively. The optical axes G1 to G3 are parallel to each other. The optical axis G1 of the first lens 261 coincides with the optical axis G3 of the light-emitting element 21a. The optical axis CG1 of the lighting device 1 may be defined using any one of the optical axes G1 to G3. In other words, the optical axis CG1 may be parallel to the optical axes G1 to G3.

[0041] The first lens 261 and the second lens 271 are disposed in front of the light-emitting element 21a. The first lens 261 and the second lens 271 control the light emitted from the light-emitting element 21a so that the luminous intensity of the light emitted above the optical axis CG1 of the lighting device 1 is smaller than the luminous intensity of the light emitted below the optical axis CG1. The front side of the light-emitting element 21a is the direction of the optical axis G3 of the light-emitting element 21a, in other words, the front direction of the light-emitting element 21a.

[0042] The first lens 261 has a central axis G11 and a rear half 261a that is vertically symmetrical with respect to the central axis G11, and a front half 261b that has a central axis TG12 that is shifted upward from the central axis G11. The central axis G11 of the rear half 261a coincides with the optical axis G1 of the first lens 261. The second lens 271 has a rear half 271a and a front half 271b that are both convex curved surfaces. The central axes G11 and G12 are parallel to the optical axis G1 of the first lens 261.

[0043] Since the central axis G12 of the front half 261b is shifted upward from the central axis G11 of the rear half 261a, light is less likely to be emitted below the optical axis G1 of the first lens 261. This prevents the light emitted from the first lens 261 from being emitted from the lower corner R1 of the emission surface 271f of the second lens 271 when passing through the second lens 271. When the light emitted from the first lens 261 is emitted from the lower corner R1 of the second lens 271, the light is likely to be refracted above the optical axis G2 of the second lens 271 and emitted upward.

[0044] However, as described above, in this embodiment, the emitted light of the first lens 261 is prevented from being emitted from the lower corner R1 of the second lens 271. As a result, the emitted light (illumination light) from the light-emitting element 21a is controlled so that the luminous intensity of the light emitted above the optical axis CG1 of the lighting device 1 is smaller than the luminous intensity of the light emitted below the optical axis CG1.

[0045] Specifically, the rear half 261a of the first lens 261 has a shape that is, for example, a truncated cone tapered toward its rear face 261c, with its outer circumferential face 261d curved toward the outer circumferential side. The front half 261b of the first lens 261 is generally cylindrical with a diameter that decreases toward its front face 261e. The front half 261b of the first lens 261 has an upper face 261f that is inclined downward toward the front and a lower face 261g that is inclined upward toward the front, with the lower face 261g being closer to the optical axis G1 of the first lens 261 than the upper face 261f.

[0046] First lens 261 has an entrance surface 261h, an exit surface 261i, a first reflecting surface 261j, and a second reflecting surface 261k.

[0047] The incident surface 261h is a surface into which light emitted from the light-emitting element 21a is incident. The incident surface 261h is disposed in front of the light-emitting element 21a. The incident surface 261h is configured by the rear surface 261c of the first lens 261. The incident surface 261h is concave (for example, a cylindrical concave with a bottom) recessed forward (in the optical axis direction of the first lens 261). That is, the incident surface 261h has an inner circumferential surface and a bottom surface.

[0048] The incident surface 261h has a first incident surface 261m and a second incident surface 261n. The first incident surface 261m is formed by the bottom surface of the incident surface 261h, and is formed, for example, in a convex curved shape protruding backward so as to guide the emitted light from the light emitting element 21a to the emission surface 261i. The second incident surface 261n is formed by the inner peripheral surface of the incident surface 261h, and is an incident surface capable of guiding the light that is not incident on the first incident surface 261m, among the emitted light from the light emitting element 21a, to the emission surface 261i. The length L1 of the upper end of the second incident surface 261n in the axial direction (optical axis G1 direction) is longer than the length L2 of the lower end of the second incident surface 261n in the axial direction (optical axis G1 direction). Therefore, the area of ​​the upper end side of the second incident surface 261n is larger than the area of ​​the lower end side. As a result, more of the light that is incident from the light emitting element 21a to the second incident surface 261n is incident on the upper end side than on the lower end side.

[0049] The first reflecting surface 261j is formed by an outer peripheral surface 261d of the rear half 261a of the first lens 261. The diameter of the rear half 261a of the first lens 261 gradually increases from the rear side to the front side of the rear half 261a, and the first reflecting surface 261j is curved in a convex shape toward the outer peripheral side of the rear half 261a. The first reflecting surface 261j is a reflecting surface that reflects light incident on the second entrance surface 261n and guides it to the exit surface 261i.

[0050] The second reflecting surface 261k is formed by the outer peripheral surface of the front half 261b of the first lens 261. The second reflecting surface 261k is a reflecting surface capable of reflecting light that passes through the first entrance surface 261m and deflects from the direction of the exit surface 261i, and light that deflects from the direction of the exit surface 261i after being reflected by the first reflecting surface 261j, and guiding the light to the exit surface 261i. The second reflecting surface 261k has an upper surface 261f that slopes downward and a lower surface 261g that slopes upward. The lower surface 261g is closer to the optical axis G1 of the first lens 261 than the upper surface 261f. As a result, the central axis G12 of the front half 261b is shifted upward from the optical axis G1 of the first lens 261. As described above, the lower surface 261g is closer to the optical axis G1 of the first lens 261 than the upper surface 261f. As a result, when light emitted from first lens 261 passes through second lens 271, it is more likely to pass above lower corner R1 and be emitted from second lens 271 without being incident on lower corner R1 of exit surface 271f of second lens 271.

[0051] Exit surface 261i is formed by front surface 261e of first lens 261. Exit surface 261i is a surface that emits light that has passed through first lens 261 to the outside of first lens 261. Exit surface 261i is, for example, a flat surface.

[0052] Incidentally, the exit surface 261i may be a convex curved surface that protrudes forward. In this case, the light emitted from the exit surface 261i is refracted in a direction substantially parallel to the optical axis G1 of the first lens 261 and emitted. As a result, when the light emitted from the exit surface 261i passes through the second lens 271, it is possible to prevent the light from being emitted from the lower corner R1 of the second lens 271.

[0053] Rear half 271a of second lens 271 is shaped like a convex lens protruding backward and has lower surface 271c. Front half 271b of second lens 271 is shaped like a convex lens protruding forward and has lower surface 271d. Second lens 271 has incident surface 271e and exit surface 271f.

[0054] The incident surface 271e is a surface on which the emitted light of the first lens 261 is incident, and is a convex curved surface. The incident surface 271e faces the emission surface 261i of the first lens 261 with a gap therebetween. The emission surface 271f is a surface that emits the light transmitted through the second lens 271 to the outside of the second lens 271. The apex P1 of the incident surface 271e and the apex P2 of the emission surface 271f are, for example, at the same height in the vertical direction, and are disposed below the center of the second lens 271 in the vertical direction. The optical axis G2 of the second lens 271 is an axis passing through the apexes P1 and P2. The optical axis G2 of the second lens 271 is disposed below the optical axis G1 of the first lens 261. The second lens 271 has a corner (lower corner of the emission surface 271f) R1 at the boundary between the emission surface 271f and the lower surface 271d.

[0055] The light shielding plate 25 is disposed so that the opening 25a faces the emission surface 271f of the second lens 271. The upper end T1 of the opening 25a is located lower than the upper end T2 of the emission surface 271f of the second lens 271, and the lower end T3 of the opening 25a is located higher than the lower end T4 of the emission surface 271f of the second lens 271. This allows the opening 25a to effectively transmit part of the light emitted from the second lens 271. As a result, the uncontrolled light included in the light emitted from the emission surface 271f of the second lens 271 can be efficiently blocked. In addition, the light shielding plate 25 is disposed in front of the emission surface 271f of the second lens 271, so that the light shielding plate 25 is disposed sufficiently away from the light emitting element 21a, and as a result, the light shielding plate 25 can be prevented from being heated by the light from the light emitting element 21a.

[0056] The light blocking plate 25 is disposed at a distance from the exit surface 271f of the second lens 271. For example, it is desirable that the distance D1 between the apex P2 of the exit surface 271f of the second lens 271 and the rear surface of the light blocking plate 25 satisfies the relationship of the formula 1 (the relationship that the distance D1 is 1 mm or more). D1≧1mm ··· Formula 1

[0057] The light shielding plate 25 may generate heat due to blocking of light. By providing a distance D1 between the light shielding plate 25 and the second lens 271 so as to satisfy the relationship of formula 1, it is possible to prevent the heat generated at the light shielding plate 25 from being transmitted to the second lens 271.

[0058] (An example of the propagation of light emitted from a light-emitting element) Next, with reference to FIG. 6, an example of how the light emitted from the light emitting element 21a propagates will be described.

[0059] The light emitted from the light emitting element 21a is incident on the first incident surface 261m and the second incident surface 261n.

[0060] The light C2 incident on the first entrance surface 261m is transmitted through the exit surface 261i of the first lens 261, the entrance surface 271e and the exit surface 271f of the second lens 271, and the cover 3 (FIG. 4), and is emitted as illumination light C10. The light C2 incident on the first entrance surface 261m is emitted mainly in the direction of the optical axis CG1 (see FIG. 1) as illumination light C10.

[0061] In addition, since the lower surface 261g of the front half 261b of the first lens 261 is closer to the optical axis G1 of the first lens 261 than the upper surface 261f, the light emitted from the first lens 261 is less likely to be emitted from the lower corner R1 of the second lens 271 when it passes through the second lens 271. This makes it possible to prevent the illumination light C10 from being emitted above the optical axis CG1 of the lighting device 1, as described above.

[0062] A part of the light C3, light C31, incident on the second entrance surface 261n is reflected by the first reflecting surface 261j of the first lens 261. Then, the light C31 passes through the exit surface 261i of the first lens 261, the entrance surface 271e and the exit surface 271f of the second lens 271, and the cover 3 (see FIG. 4), and is emitted as illumination light C10. At this time, the light C31 incident on the upper surface W1 of the second entrance surface 261n is likely to be emitted to the lower side of the optical axis G2 of the second lens 271 (hence, the lower side of the optical axis CG1 of the lighting device 1). Also, the light C31 incident on the lower surface W2 of the second entrance surface 261n is likely to be emitted to the upper side of the optical axis G2 of the second lens 271 (i.e., the upper side of the optical axis CG1 of the lighting device 1). In this embodiment, since the axial length L1 (see FIG. 5) of the upper surface W1 is longer than the axial length L2 (see FIG. 5) of the lower surface W2, more light is incident on the upper surface W1 than on the lower surface W2. As a result, the luminous intensity of the light emitted above the optical axis CG1 of the illumination device 1 is smaller than the luminous intensity of the light emitted below the optical axis CG1. This makes it possible to suppress the illumination light C10 from being emitted above the optical axis CG1 of the illumination device 1.

[0063] Light C4 incident on a lower corner R2 (a concave corner at the boundary between the bottom surface 261m and the lower surface W2) of the first entrance surface 261m may be refracted upward when passing through the lower corner R2 if the lower corner R2 is not sufficiently angular due to a manufacturing error or the like. In this case, the refracted light C4 is reflected by the upper surface of the first reflecting surface 261j and emitted from the exit surface 261i of the first lens 261. Then, when the light C4 passes through the second lens 271, it is emitted from the lower corner R1 of the exit surface 271f, refracted upward, and emitted above the optical axis G2 of the second lens 271 (hence, above the optical axis CG1 of the lighting device 1). In this embodiment, the light that is emitted from the lower corner R1 of the emission surface 271f, refracted upward, and emitted above the optical axis CG1 when passing through the second lens 271 (i.e., uncontrolled light that cannot be controlled by the lenses 261, 271 and is emitted above the optical axis CG1) is blocked by the light blocking plate 25. This also makes it possible to prevent the illumination light C10 from being emitted above the optical axis CG1.

[0064] In this way, in the lighting device 1, the light emitted from the light-emitting element 21a is distributed by the first lens 261, the second lens 271, and the light shielding plate 25 so that the luminous intensity of the light emitted above the optical axis CG1 is smaller than the luminous intensity of the light emitted below the optical axis CG1. At that time, the light shielding plate 25 can selectively block uncontrolled light that cannot be controlled by the lenses 261, 271 and is emitted above the optical axis CG1.

[0065] (Arrangement of light-emitting elements) Next, the arrangement of the light emitting elements 21a will be described in detail with reference to FIGS.

[0066] As described above, the illumination light C10 of the lighting device 1 is distributed by the lenses (first lens 261 and second lens 271) and the light shielding plate 25 so that the luminous intensity of the light emitted above the optical axis CG1 is smaller than the luminous intensity of the light emitted below the optical axis CG1. However, if the luminous intensity of the light emitted above the optical axis CG1 is too low, when the lighting device 1 is used as a floodlight for a sports stadium or the like, it will be difficult to see the ball when it flies into the sky at night. For this reason, it is necessary to ensure a certain level of luminous intensity of the light emitted above the optical axis CG1.

[0067] In this embodiment, the light emitting element 21a is disposed at a constant distance D2 between the light emitting element 21a and the opening surface of the incident surface 261h of the first lens 261 facing the light emitting element 21a (see FIG. 5). As a result, a part of light C5 emitted from the light emitting element 21a propagates through the cover 3 without being incident on the first lens 261, passes through the upper wall 31u of the cover 3, and is emitted to the outside as illumination light C10 (see FIGS. 4 and 6). As a result, the illumination light C10 of the lighting device 1 is distributed so that the luminous intensity of the light emitted above the optical axis CG1 is not too low and is secured to a certain degree of luminous intensity.

[0068] The light C5 may be directly emitted to the outside from the upper wall 31u of the cover 3, or may be repeatedly reflected within the cover 3 and then emitted to the outside from the upper wall 31u of the cover 3. Since the light C5 only needs to contribute to increasing the amount of light emitted above the optical axis G1 in the illumination light C10, the light C5 may be emitted from the front surface 102a of the cover 3 instead of the upper wall 31u of the cover 3, as long as the light C5 is emitted above the optical axis CG1.

[0069] In this embodiment, it is desirable that the distance D2 between the light emitting element 21a and the incident surface 261h of the first lens 261 satisfies the relationship of formula 2 (the relationship being 1 mm or more and 5 mm or less). 1mm≦D2≦5mm...Formula 2

[0070] Due to the relationship of formula 1, the above-mentioned interval D2 allows a portion of light C5 emitted from the light emitting element 21a to be effectively emitted above the optical axis CG1 of the illumination device 1 without passing through the first lens 261 and the second lens 271. If the interval D2 is smaller than 1 mm, the light C5 does not sufficiently contribute to the light emitted above the optical axis CG1 in the illumination light C10, and if the interval D2 is larger than 1 mm, the light C5 contributes too much to the light emitted above the optical axis CG1 in the illumination light C10.

[0071] In this way, the illumination light C10 of the illumination device 1 includes a first light (e.g., C2, C3) and a second light (e.g., C5). The first light is light emitted from the light-emitting element 21a after passing through the first lens 261, the second lens 271, and the light shielding plate 25. The second light is light emitted from the light-emitting element 21a without passing through the first lens 261 and the second lens 271 due to the above-mentioned distance D2.

[0072] In addition, by using lenses 26, 27 instead of light shielding plate 25, leakage light (uncontrolled light) leaking from lenses 26, 27 also contributes to increasing the brightness of the light emitted above the optical axis CG of the illumination light C10.

[0073] (Light distribution characteristics of lighting equipment) Next, the light distribution characteristic of the illumination light C10 of the illumination device 1 will be described with reference to FIG.

[0074] 7, the vertical axis indicates the luminous intensity of the illumination light C10, and the horizontal axis indicates the vertical light distribution angle of the illumination light C10 of the lighting device 1. The vertical axis employs a logarithmic scale. The horizontal axis is in degrees, with 0 degrees being the direction of the optical axis CG1 of the lighting device 1, the + side of the horizontal axis corresponding to the upper side of the optical axis CG1, and the - side of the horizontal axis corresponding to the lower side of the optical axis CG1.

[0075] In the illumination light C10, the luminous intensity of the light emitted in a direction 15 degrees downward from the optical axis CG1 is defined as luminous intensity M1, the luminous intensity of the light emitted in a direction 15 degrees upward from the optical axis CG1 is defined as luminous intensity M2, and the luminous intensity of the light emitted in a direction 60 degrees upward from the optical axis CG1 is defined as luminous intensity M3. The ratio of the luminous intensity M2 to the luminous intensity M1 is defined as a first luminous intensity ratio Q1 (= T2 / T1), and the ratio of the luminous intensity M3 to the luminous intensity M2 is defined as a second luminous intensity ratio Q2 (= T3 / T2).

[0076] As described above, the illumination light C10 of the lighting device 1 is distributed by the light distribution member 24 (the first lens 261, the second lens 271, and the light shielding plate 25) so that the luminous intensity of the light emitted above the optical axis CG1 is smaller than the luminous intensity of the light emitted below the optical axis CG1. Specifically, it is preferable that the light distribution member 24 is configured so that the illumination light C10 satisfies the relationship of Equation 3 (i.e., the first luminous intensity ratio Q1 is 0.1 or less, preferably 0.05% or less). Q1≦0.1 (preferably Q1≦0.05%) Equation 3

[0077] If Q1>0.1, the luminous intensity of the light emitted above the optical axis CG1 in the illumination light C10 may become too large relative to the luminous intensity of the light emitted below the optical axis CG1.

[0078] Furthermore, as described above, the illumination light C10 of the lighting device 1 is distributed such that a part of the light C5 emitted from the light emitting element 21a is not incident on the first lens 261 and the second lens 271 but is emitted above the optical axis CG1 due to the distance D2 between the light emitting element 21a and the first lens 261. Specifically, it is preferable to set the distance D2 so that the illumination light C10 satisfies the relationship of Equation 3. Furthermore, it is preferable to set the distance D2 so that the illumination light C10 satisfies the relationship of Equation 4 (i.e., the relationship in which the second luminous intensity ratio Q2 is 0.55 or more and 0.9 or less). 0.55≦Q2≦0.9 ··· Equation 4

[0079] In addition, when Q2>0.9, the luminous intensity of the light emitted above the optical axis CG1 in the illumination light C10 is not as high as the required luminous intensity (for example, the luminous intensity required to visually recognize a ball flying in the sky at night). ) becomes too large. Furthermore, when Q2<0.55, the luminous intensity of the light emitted above the optical axis CG1 in the illumination light C10 becomes too small compared to the required luminous intensity.

[0080] (Major Effects) As described above, according to the lighting device 1 of this embodiment, the light shielding plate 25 partially shields the light emitted from the light-emitting element 21a through the lenses 261, 271 so that the luminous intensity of the light emitted 15 degrees above the optical axis CG1 of the illumination light C10 is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis CG1. Therefore, the light shielding plate 25 can prevent uncontrolled light that cannot be controlled by the lenses 261, 271 from being emitted above the optical axis CG1 of the lighting device 1.

[0081] Moreover, by arranging the light-emitting element 21a at a distance D2 from the first lens 261, the illumination light C10 includes first light C2, C3 and second light C5. The first light C2, C3 is light emitted from the light-emitting element 21a after passing through the lenses 261, 271. The second light C5 is light emitted from the light-emitting element 21a to the upper side of the optical axis CG1 without passing through the lenses 261, 271. Therefore, with a simple configuration in which the light-emitting element 21a is arranged at a distance D2 from the first lens 261, the luminous intensity of the light emitted to the upper side of the optical axis CG1 in the illumination light C10 can be increased. As a result, if the luminous intensity of the light emitted above the optical axis CG1 in the illumination light C10 is too suppressed by the light-shielding plate 25, the luminous intensity of the light emitted above the optical axis CG1 in the illumination light C10 can be increased to the required luminous intensity by setting the distance D2 between the light-emitting element 21a and the first lens 261 to an appropriate distance.

[0082] (Modification) The modified examples described below can be applied in appropriate combination. In the modified examples described below, differences from the above embodiment will be mainly described. In the modified examples described below, the same parts as those in the above embodiment will be denoted by the same reference numerals and descriptions thereof may be omitted.

[0083] (Variation 1) In the above embodiment, the light shielding plate 25 (light shielding member) is disposed only in front of the second lens block 27. However, as shown in Fig. 8, in addition to the light shielding plate 25 (second light shielding member), a light shielding plate 35 (first light shielding member) may be further disposed between the first lens block 26 and the second lens block 27. In this case, the lighting device 1 includes two light shielding plates 25, 35.

[0084] The light shielding plate 35 has a plurality of openings 35a corresponding one-to-one to the plurality of first lenses 261 of the first lens block 26. The light shielding plate 35 is disposed so that the openings 35a face the emission surface 261i of the first lens 261. The upper end T5 of the openings 35a is located lower than the upper end T6 of the emission surface 261i of the first lens 261, and the lower end T7 of the openings 35a is located higher than the lower end T8 of the emission surface 261i of the first lens 261. This allows the openings 35a to partially transmit the light emitted from the first lens 261. As a result, the uncontrolled light included in the light emitted from the emission surface 261i of the first lens 261 can be efficiently blocked. Note that in this modification, at least a part of the uncontrolled light included in the light emitted from the first lens 261 may be blocked by the light shielding plate 35, and the remaining uncontrolled light may be blocked by the light shielding plate 25.

[0085] The light shielding plate 35 is disposed at an interval from the first lens 261. This can prevent heat generated in the light shielding plate 35 by the light emitted from the light-emitting element 21a from being transmitted to the first lens 261. The light shielding plate 35 is disposed closer to the first lens 261 than the second lens 271. In other words, the light shielding plate 35 is disposed closer to the first lens 261 than the middle position of the distance between the apex P3 of the emission surface 261i of the first lens 261 and the apex P1 of the incidence surface 271e of the second lens 271. This can prevent heat generated in the light shielding plate 35 by the light emitted from the light-emitting element 21a from being transmitted to the second lens 271.

[0086] Specifically, if the distance between the opposing surfaces of the light shielding plate 35 and the first lens 261 (the rear surface 35d of the light shielding plate 35 and the exit surface 261i of the first lens 261) is taken as distance D3, it is desirable that distance D3 satisfy the relationship in equation 5 (i.e., the relationship that distance D3 is greater than or equal to 1 mm and less than or equal to 5 mm). 1mm≦D3≦5mm... Formula 5

[0087] In addition, in the vertical direction, the opening 35a of the light shielding plate 35 is larger than the opening 25a of the light shielding plate 25. This allows the light shielding area of ​​the light shielding plate 35 to be smaller. As a result, heat generation of the light shielding plate 35 due to the light emitted from the light emitting element 21a can be suppressed. The opening 35a of the light shielding plate 35 may be the same size as the opening 25a of the light shielding plate 25 or smaller than the opening 25a.

[0088] According to this modification, since the lighting device 1 includes the two light blocking plates 25, 35, the degree of freedom in designing each of the light blocking plates 25, 35 can be improved.

[0089] In this modified example, the two light shielding plates 25, 35 are provided, but it is sufficient that at least one of the two light shielding plates 25, 35 is provided.

[0090] (Variation 2) In the first modification, the light shielding plate 25 (second light shielding plate) has a plurality of openings 25a (second openings) corresponding one-to-one to the plurality of second lenses 271. However, as shown in FIG. 9, the light shielding plate 25 may have a plurality of slits 25b (second openings) corresponding to each row of the arrangement of the plurality of second lenses 271 as openings. Each slit 25b extends in the left-right direction of the light shielding plate 25 (horizontal direction of the lighting device 1). Each slit 25b is disposed in the light shielding plate 25 so as to face the second lens 271 included in the corresponding row (i.e., the second lens 271 arranged in the left-right direction (horizontal direction of the lighting device 1)). The plurality of slits 25b are disposed in the light shielding plate 25 at intervals from each other in the up-down direction (vertical direction of the lighting device 1). The vertical direction of the lighting device 1 is the up-down direction when the optical axis CG1 of the lighting device 1 faces the horizontal direction.

[0091] Similarly, the light shielding plate 35 (first light shielding plate), like the light shielding plate 25, may have, as openings, a plurality of slits 35a (first openings) corresponding to each row of the arrangement of the plurality of first lenses 261, as shown in Fig. 9. That is, each slit 35b extends in the left-right direction of the light shielding plate 35. Each slit 35b is disposed in the light shielding plate 35 so as to face the first lens 261 included in the corresponding row (i.e., the first lenses 261 aligned in the left-right direction). The plurality of slits 35b are disposed in the light shielding plate 35 at intervals from each other in the up-down direction.

[0092] According to this configuration, the opening of the light shielding plate 25 is formed by the slit 25b extending in the left-right direction. Also, the opening of the light shielding plate 35 is formed by the slit 35b extending in the left-right direction. Therefore, the light shielding area of ​​each of the light shielding plates 25, 35 can be further reduced. As a result, heat generation of each of the light shielding plates 25, 35 due to the light emitted from the light emitting element 21a can be further suppressed.

[0093] (Variation 3) In the second modification, the slits 25b of the light shielding plate 25 and the slits 35b of the light shielding plate 35 both extend in the left-right direction of the light shielding plate 25, 35 (the horizontal direction of the lighting device 1). However, as shown in FIG. 10, one of the slits 25b of the light shielding plate 25 and the slits 35b of the light shielding plate 35 may extend in the left-right direction of the light shielding plate (the horizontal direction of the lighting device 1), and the other slit may extend in the up-down direction of the light shielding plate (the vertical direction of the lighting device 1). In the example of FIG. 10, the slits 25b of the light shielding plate 25 extend in the left-right direction of the light shielding plate 25 as in the second modification. On the other hand, the slits 35b of the light shielding plate 35 extend in the up-down direction of the light shielding plate 35. The light shielding plate 35 has a plurality of slits 35b corresponding to each row of the arrangement of the plurality of first lenses 261. Each slit 35b is disposed opposite a first lens 261 (that is, first lenses 261 lined up in the vertical direction) included in the corresponding row in the light blocking plate 35. This modification also provides the same effects as the second modification.

[0094] (summary) The illumination device (1) according to the first aspect is an illumination device that emits illumination light (C10). The illumination device (1) includes a light-emitting element (21a), lenses (261, 271), and light-shielding members (25, 35). The lens (261) is disposed facing the light-emitting element (21a). The light-shielding members (25, 35) partially shield the light emitted from the light-emitting element (21a) through the lens (261) so that the luminous intensity of the light emitted 15 degrees above the optical axis (CG1) of the illumination device (1) of the illumination light (C10) is smaller than the luminous intensity of the light emitted 15 degrees below the optical axis (CG1).

[0095] According to this configuration, the light blocking members (25, 35) partially block the light that is emitted from the light-emitting element (21a) through the lens (261) so that the luminous intensity of the light, of the illumination light (C10), that is emitted 15 degrees above the optical axis (CG1) of the illumination device (1) is smaller than the luminous intensity of the light that is emitted 15 degrees below the optical axis (CG1) of the illumination device (1). Therefore, the light blocking members (25, 35) can prevent uncontrolled light that cannot be controlled by the lens (261) from being emitted above the optical axis (CG1) of the illumination device (1).

[0096] The lighting device (1) according to the second aspect is the first aspect, and the ratio of the luminous intensity of the light emitted in a direction 15° above the optical axis (CG1) to the luminous intensity of the light emitted in a direction 15° below the optical axis (CG1) of the illumination light (C10) is set to a luminous intensity ratio (Q1). The luminous intensity ratio (Q1) is 0.1 or less.

[0097] According to this configuration, it is possible to effectively prevent uncontrolled light that cannot be controlled by the lens (261) from being emitted above the optical axis (CG1) of the illumination device (1).

[0098] In the illumination device (1) according to the third aspect, the lens (261) in the first or second aspect is the first lens (261), and the illumination device (1) further includes a second lens (271). The second lens (271) is disposed facing the light exit surface (261i) of the first lens (261). The light shielding member (25, 35) includes at least one of a first light shielding member (35) and a second light shielding member (25). The first light shielding member (35) is disposed between the first lens (261) and the second lens (271) and includes a first opening (35a; 35b) that partially transmits the light exiting from the first lens (261). The second light shielding member (25) is disposed on the light exit surface side of the second lens (271) and includes a second opening (25a; 25b) that partially transmits the light exiting from the second lens (271).

[0099] According to this configuration, the light shielding members (25, 35) can prevent uncontrolled light that cannot be controlled by the lenses (261, 271) from being emitted upward from the optical axis (CG1) of the illumination device (1). In particular, when two light shielding members (the first light shielding member (35) and the second light shielding member (25)) are provided, the uncontrolled light can be blocked by a combination of the two light shielding members (25, 35), and therefore the degree of freedom in designing each of the two light shielding members (25, 35) can be improved. Furthermore, when the second light shielding member (25) is provided, the second light shielding member (25) is farther from the light emitting element (21a) than the first light shielding member (35), and therefore it is easy to prevent heat generation of the second light shielding member (25) due to the light emitted from the light emitting element (21a). Furthermore, the first light-shielding member (35) is disposed closer to the light-emitting element (21a) than the second light-shielding member (25), and therefore is more likely to block light from the light-emitting element (21a).

[0100] In the illumination device (1) according to the fourth aspect, in the third aspect, the light blocking member (25, 35) has a first light blocking member (35). The first light blocking member (35) is disposed closer to the first lens (261) than the second lens (271).

[0101] This configuration makes it possible to prevent the heat generated in the first light blocking member (35) by the light emitted from the light emitting element (21a) from being transmitted to the second lens (271).

[0102] In the illumination device (1) according to the fifth aspect, in the fourth aspect, the first light blocking member (35) is disposed with a gap between it and the first lens (261).

[0103] This configuration makes it possible to prevent the heat generated in the first light blocking member (35) due to the light emitted from the light emitting element (21a) from being transmitted to the first lens (261).

[0104] The illumination device (1) according to a sixth aspect is the fifth aspect, wherein the distance (D3) between the opposing surfaces of the first light blocking member (35) and the first lens (261) is not less than 1 mm and not more than 5 mm.

[0105] With this configuration, it is possible to effectively prevent the heat generated in the first light blocking member (35) due to the light emitted from the light emitting element (21a) from being transmitted to the first lens (261) and the second lens (271).

[0106] In the illumination device (1) according to the seventh aspect, in any one of the third to sixth aspects, the light blocking member (25, 35) has a first light blocking member (35). In the up-down direction, the first opening (35a; 35b) is smaller than the exit surface (261i) of the first lens (261).

[0107] According to this configuration, the first light-shielding member (35) can effectively block uncontrolled light (light that cannot be controlled by the first lens (261)) that is included in the light emitted from the first lens (261) and emitted above the optical axis (CG1).

[0108] In the lighting device (1) according to the eighth aspect, in any one of the third to seventh aspects, the light blocking member (25, 35) has a second light blocking member (25). In the vertical direction, the second opening (25a; 25b) is smaller than the exit surface of the second lens (271).

[0109] According to this configuration, the second light-shielding member (25) can effectively block uncontrolled light (light that cannot be controlled by the first lens (261) or the second lens (271)) that is included in the light emitted from the second lens (271) and emitted above the optical axis (CG1).

[0110] In the lighting device (1) according to the ninth aspect, in any one of the third to eighth aspects, the light blocking member (25, 35) has a first light blocking member (35) and a second light blocking member (25). In the up-down direction, the first openings (35a; 35b) are larger than the second openings (25a; 25b).

[0111] This configuration can further reduce the light blocking area of ​​the first light blocking member (35), thereby reducing heat generation in the first light blocking member (35) due to the light emitted from the light emitting element (21a).

[0112] The lighting device (1) according to the tenth aspect is any one of the third to ninth aspects, and includes a plurality of light-emitting elements (21a), a first lens (261), and a second lens (271) arranged in a lateral direction (left-right direction) of the lighting device (1). The light-shielding members (25, 35) include a first light-shielding member (35). The first openings (35a; 35b) are slits extending in the lateral direction and facing the plurality of first lenses (261) arranged in the lateral direction.

[0113] According to this configuration, the first openings (35a; 35b) are slits extending in the horizontal direction and facing the first lenses (261) arranged in the horizontal direction, so that the light blocking area of ​​the first light blocking member (35) can be further reduced. As a result, heat generation of the first light blocking member (35) due to the light emitted from the light emitting element (21a) can be further suppressed. Because the first openings (35a; 35b) are slits extending in the horizontal direction, they can effectively block uncontrolled light that is included in the light emitted from the first lenses (261) and is emitted above the optical axis (CG1).

[0114] The lighting device (1) according to an eleventh aspect is any one of the third to tenth aspects, and includes a plurality of light-emitting elements (21a), a plurality of first lenses (261), and a plurality of second lenses (271) arranged in a lateral direction (left-right direction) of the lighting device (1). The light-shielding members (25, 35) include a second light-shielding member (25). The second openings (25a; 25b) are slits extending in the lateral direction and facing the second lenses (271) arranged in the lateral direction.

[0115] According to this configuration, the second openings (25a; 25b) are slits extending in the horizontal direction and facing the second lenses (271) arranged in the horizontal direction, so that the light blocking area of ​​the second light blocking member (25) can be further reduced. As a result, heat generation of the second light blocking member (25) due to the light emitted from the light emitting element (21a) can be further suppressed. Since the second openings (25a; 25b) are slits extending in the horizontal direction, they can effectively block uncontrolled light that is included in the light emitted from the second lenses (271) and is emitted above the optical axis (CG1).

[0116] In the illumination device (1) according to the twelfth aspect, in any one of the third to ninth aspects, the light-emitting element (21a), the first lens (261), and the second lens (271) are provided in a plurality of rows arranged in the horizontal direction (left-right direction) and the vertical direction (up-down direction). The light-shielding member (25, 35) has a first light-shielding member (35) and a second light-shielding member (25). The first opening (35a; 35b) is a slit that extends in one of the horizontal direction and the vertical direction and faces the first lens (261) arranged in the one direction. The second opening (25a; 25b) is a slit that extends in the other of the horizontal direction and the vertical direction and faces the second lens (271) arranged in the other direction.

[0117] According to this configuration, the first opening (35a; 35b) and the second opening (25a; 25b) are slits facing the lenses arranged in the horizontal or vertical direction of the illumination device (1). This makes it possible to further reduce the light blocking area of ​​each of the first light blocking member (35) and the second light blocking member (25). As a result, it is possible to further suppress heat generation in each of the first light blocking member (35) and the second light blocking member (25) due to the light emitted from the light-emitting element (21a). The slits extending in the horizontal direction among the first opening (35a; 35b) and the second opening (25a; 25b) can effectively block uncontrolled light that is included in the light emitted from the light-emitting element (21a) and is emitted above the optical axis (CG1).

[0118] In the lighting device (1) according to a thirteenth aspect, in any one of the third to twelfth aspects, the light-shielding member (25, 35) has a first light-shielding member (35). The reflectance of a main surface of the first light-shielding member (35) on the side of the light-emitting element (21a) is 60% or more.

[0119] This effect makes it possible to effectively prevent heat generation in the first light blocking member (35) due to the light emitted from the light emitting element (21a). [Explanation of symbols]

[0120] 1 Lighting equipment 21a Light emitting element 25 light shielding plate (second light shielding member, light shielding member) 25a opening (second opening) 25b Slit (second opening) 35 Light shielding plate (first light shielding member) 35a opening (first opening) 35b Slit (first opening) 261 First Lens 261i exit surface 271 Second Lens C10 illumination light CG1 optical axis D3 Interval (1st Interval)

Claims

1. An illumination device that emits illumination light, A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light-emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis, the light blocking member is disposed on the light exit surface side of the lens, the light blocking member has an opening facing the light exit surface of the lens, an upper end of the opening is located below an upper end of the light exit surface of the lens, and a lower end of the opening is located above a lower end of the light exit surface of the lens; Lighting equipment.

2. The lens is a first lens, a second lens disposed opposite the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; 10. The lighting device of claim 1.

3. The light blocking member has the first light blocking member, The first light blocking member is disposed closer to the first lens than the second lens.

3. The lighting device according to claim 2.

4. The first light blocking member is disposed at a distance from the first lens.

4. The lighting device according to claim 3.

5. The distance between the opposing surfaces of the first light-shielding member and the first lens is 1 mm or more and 5 mm or less.

5. The lighting device according to claim 4.

6. The light blocking member has the first light blocking member, In the vertical direction, the first opening is smaller than the exit surface of the first lens. The lighting device according to any one of claims 2 to 5.

7. A lighting device that emits illumination light, A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; The light blocking member includes the second light blocking member, In the vertical direction, the second opening is smaller than the exit surface of the second lens. Lighting equipment.

8. A lighting device that emits illumination light, A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; the light blocking member includes the first light blocking member and the second light blocking member, In the vertical direction, the first opening is larger than the second opening. Lighting equipment.

9. A lighting device that emits illumination light, A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; the light emitting element, the first lens, and the second lens are each arranged in a lateral direction of the lighting device; The light blocking member includes the first light blocking member, The first opening is a slit extending in the horizontal direction and facing the first lenses arranged in the horizontal direction. Lighting equipment.

10. A lighting device that emits illumination light, comprising: A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; the light emitting element, the first lens, and the second lens are each arranged in a lateral direction of the lighting device; The light blocking member includes the second light blocking member, The second opening is a slit extending in the horizontal direction and arranged opposite the second lenses arranged in the horizontal direction. Lighting equipment.

11. A lighting device that emits illumination light, A light-emitting element; a lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, The light blocking member is a first light-shielding member disposed between the first lens and the second lens and having a first opening portion through which light emitted from the first lens partially passes; a second light-shielding member disposed on the exit surface side of the second lens and having a second opening portion that partially transmits the light emitted from the second lens; The light emitting element, the first lens, and the second lens are each provided in a plurality of units aligned in the horizontal and vertical directions of the lighting device, the light blocking member includes the first light blocking member and the second light blocking member, the first opening is a slit extending in one of the horizontal direction and the vertical direction and arranged opposite the first lenses arranged in the one direction, The second opening is a slit extending in the other of the horizontal direction and the vertical direction and arranged opposite the second lenses arranged in the other direction. Lighting equipment.

12. The light blocking member has the first light blocking member, The reflectance of a main surface of the first light-shielding member on the side of the light-emitting element is 60% or more. The lighting device according to any one of claims 2 to 11.

13. A lighting device that emits illumination light, comprising: A light-emitting element; A first lens disposed opposite the light emitting element; a light shielding member that partially shields light emitted from the light emitting element through the first lens so that the luminous intensity of light emitted 15 degrees above the optical axis of the lighting device is smaller than the luminous intensity of light emitted 15 degrees below the optical axis; a second lens disposed opposite to the exit surface of the first lens, the light blocking member is disposed on the exit surface side of the second lens and has a second opening portion that partially transmits the light exiting from the second lens; Lighting equipment.

14. Among the illumination light, light emitted in a direction 15° downward from the optical axis is defined as a first light, light emitted in a direction 15° upward from the optical axis is defined as a second light, and a ratio of the luminous intensity of the second light to the luminous intensity of the first light is defined as a luminous intensity ratio, the luminous intensity ratio is 0.1 or less. An illumination device according to any one of claims 1 to 13.

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