Lighting equipment

Abstract

[Problem] The purpose of the present invention is, with respect to indoor lighting, to reduce the number of installed lighting devices so as to reduce the obtrusiveness of a ceiling. [Solution] This lighting device comprises: a light source; and a dual light distribution optical element having two light distribution regions. The dual light distribution optical element distributes light emitted by the light source such that the light has a light intensity peak in two different directions that establish a predetermined dual light distribution angle. The dual light distribution angle can be adjusted by changing the distance between the light source and a lower surface of the dual light distribution optical element such that the distance has a value between a minimum value and a maximum value.

Description

[Technical field]

[0001] The present invention relates to a lighting device having a plurality of light distribution directions. [Background technology]

[0002] When using a normal lighting device to brightly illuminate multiple locations, it is common to install as many lighting devices as there are locations to be illuminated. Therefore, when lighting multiple locations such as desks and walls in a store, it becomes necessary to install many lighting devices on the ceiling, which can make the ceiling look somewhat cluttered.

[0003] Although the problem is different, as a technology related to the present invention, Patent Document 1 shows a two-light distribution type lighting device used for road lighting and the like. The purpose of this is to distribute light in the left and right directions using a lens with a pair of side convex parts for each of multiple light sources, and to illuminate a horizontally long area. Although the amount of light distributed in the central direction is small, the distance in the central direction is also small, so it is said that it is possible to suppress the drop in illuminance in the central area and to illuminate a horizontally long area with suppressed illuminance unevenness. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2014-093233 Summary of the Invention [Problem to be solved by the invention]

[0005] The lighting device described in Patent Document 1 aims to illuminate a horizontally long area relatively uniformly, and is not designed to illuminate in two directions. In addition, since it is an outdoor lighting device, it is not designed to reduce the clutter on the ceiling.

[0006] The present invention aims to reduce the number of lighting devices installed in indoor lighting and to reduce the cluttered feeling on the ceiling. It also aims to reduce the number of lighting devices installed in outdoor lighting and to reduce the cluttered feeling caused by having many lighting devices. It also aims to reduce the installation costs, etc. [Means for solving the problem]

[0007] The present invention is directed to Light source centered With a light source, Equipped with a light input surface and a light output surface Two-way light distribution optical element a reflecting mirror that reflects light emitted from a center of the light source and not directly incident on the lower surface of the two-way light distribution optical element, and causes the light to be incident on the lower surface of the two-way light distribution optical element. A lighting device comprising: The two-way light distribution optical element has a light incident surface or a light exit surface, and the light incident surface is located only to the left of the optical axis. A left light source that emits light emitted from the center of the light source to the left of the optical axis. a light distribution area, and a light emitting surface, the light emitting surface, and the ... A right light source that outputs light emitted from the center of the light source to the right of the optical axis. Equipped with a light distribution area, a separation distance is provided between the light source and the light incident surface of the two-way light distribution optical element; The two-way light distribution optical element distributes light emitted from the light source so that the light has peaks of luminous intensity in a diagonal left direction and a diagonal right direction from the optical axis, and takes an angle between the two peak directions, which is the angle between the two directions; The angle between the two peak directions can be changed by changing the separation distance to a value between a minimum value and a maximum value.

[0008] In the present invention, the angle between the two peak directions may be changeable by changing the separation distance to take a value between the minimum value and the maximum value without changing the orientation of the two-directional light distribution optical element. In the present invention, the lighting device comprises: The reflecting mirror may be: a rear reflector movable integrally with the light source; A height of the rear reflector, which is a distance from the light source to an imaginary plane including an upper end of the rear reflector in the optical axis direction, may be equal to or less than the minimum value of the separation distance.

[0009] In the present invention, the lighting device comprises: The reflecting mirror may be: a front reflecting mirror that is movable integrally with the two-way light distribution optical element; When the separation distance is at the minimum value, the rear reflector is inside the front reflector. Good too.

[0010] The present invention is directed to Light source centered A light source and a reflector arranged to surround the optical axis; A light input surface and a light output surface are provided. A lighting device including a two-way light distribution optical element to which light is incident from the light source and the reflecting mirror, the two-way light distribution optical element has a left light distribution region that outputs the light emitted from the light source center to the left of the optical axis, and a right light distribution region that outputs the light emitted from the light source center to the right of the optical axis, The relative positions of the reflector and the light source are fixed, The reflecting mirror reflects the light emitted from the light source center in a direction outward from the optical axis direction. 、 before By combining the two-way light distribution optical element and the reflecting mirror, the light emitted from the light source is distributed so that it has peaks of luminous intensity in two different directions and takes an angle between the two peak directions, which is the angle between the two directions.

[0011] The present invention provides a lighting device that includes a lamp body and a frame, and the angle of the lamp body relative to the frame can be changed, The lamp body is arranged on the optical axis. Light source centered A light source and a reflector arranged to surround the optical axis; A light input surface and a light output surface are provided. a bidirectional light distribution optical element into which light is incident from the light source and the reflecting mirror, the two-way light distribution optical element has a left light distribution region that outputs the light emitted from the light source center to the left of the optical axis and a right light distribution region that outputs the light emitted from the light source center to the right of the optical axis, The relative positions of the reflector and the light source are fixed, The reflecting mirror reflects the light emitted from the light source center in a direction outward from the optical axis direction. 、 before By combining the two-way light distribution optical element and the reflecting mirror, the light emitted from the light source is distributed so as to have peaks of luminous intensity in two different directions and to take an angle between the two peak directions, which is the angle between the two directions; By changing the angle of the light body, it is possible to distribute light in one of the two directions perpendicular to the frame.

[0012] In the present invention, the reflecting mirror may reflect light emitted from a center of the light source outwardly at an angle of 5 degrees or more from the optical axis direction.

[0013] In the present invention, the reflecting mirror is rotationally symmetric with respect to the optical axis, The two light distributing optical elements may have a circular outer shape.

[0014] The present invention is directed to Light source centered With a light source, Located away from the light source, Light is incident from the light source, and to the left of the optical axis Emits light Left light distribution area and to the right of the optical axis Emits light 2 with right light distribution area direction A lighting device equipped with a light distribution optical element, Part 2 direction The light distribution optical element has a circular outer shape, Part 2 direction The light distribution optical element has a light incident surface and a light exit surface, and at least one of the light incident surface and the light exit surface is Only to the left of the optical axis The left light distribution area and a light emitting surface, the light emitting surface, and the light emitting surface, the light emitting surface, and the light emitting surface, the light emitting surface, and the light emitting surface, The right light distribution area 、 before The light emitted from the light source has luminous intensity peaks in the left and right directions obliquely from the optical axis due to the left and right light distribution regions. Then, take the angle between the two peak directions, which is the angle between the two directions. This is a lighting device that distributes light in such a way that

[0015] The present invention provides a lighting device that includes a lamp body and a frame, and the angle of the lamp body relative to the frame can be changed, The lamp body is arranged on the optical axis. Light source centered With a light source, Located away from the light source, Light is incident from the light source, and to the left of the optical axis Emits light Left light distribution area and to the right of the optical axis Emits light 2 with right light distribution area direction A light distribution optical element is provided, Part 2 direction The light distribution optical element has a circular outer shape, Part 2 direction The light distribution optical element has a light incident surface and a light exit surface, and at least one of the light incident surface and the light exit surface is provided on the left side of the optical axis. only To The above Left light distribution area At least one of the light entrance surface and the light exit surface is provided. To the right of the optical axis only To The above Equipped with a right light distribution area 、 before The light emitted from the light source has luminous intensity peaks in the left and right directions obliquely from the optical axis due to the left and right light distribution regions. Then, take the angle between the two peak directions, which is the angle between the two directions. The light is distributed as follows: By changing the angle of the lamp body, it is possible to distribute light perpendicular to the frame in one of the diagonal left direction and the diagonal right direction from the optical axis.

[0016] In the present invention, Lighting equipment With the lighting device installed, The two-way light distribution optical element The above two peak directions can be replaced with other two-way light distribution optical elements with different angles between them. Equipped with a detachable mechanism This is also fine.

[0017] In the present invention, The center line of the left light distribution area and the right The ratio of the distance between the center lines of the light distribution areas to the diameter of the two light distributing optical elements may be 45% or more and 100% or less.

[0018] In the present invention, , in the left-right direction and in the direction perpendicular to the optical axis direction The light distribution characteristics may be different.

[0019] In the present invention, linear convex or concave portions extending in one direction may be provided on a surface of the light distribution area so as to be aligned in another direction.

[0020] In the present invention, the light source may be made up of LEDs of a plurality of luminous colors, and the LEDs of the plurality of luminous colors may include a bluish-white LED, a yellowish-white LED, and a red LED. Effect of the Invention

[0021] According to the present invention, by distributing light in two directions in a lighting device, it is possible to reduce the number of lighting devices to be installed and to alleviate the sense of clutter that arises from installing a large number of lighting devices on a ceiling or outdoors.

[0022] Accordingly, the cost of installing the lighting device can be reduced. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a side cross-sectional view of a state in which the lighting device of the first embodiment is installed. [Diagram 2] FIG. 1 is a cross-sectional view illustrating a reflector and light rays of the lighting device according to the first embodiment. [Diagram 3] FIG. 1 is a plan view of a two-light distribution optical element of an illumination device according to a first embodiment, as viewed from the light exit surface side. [Figure 4] Simulation results of light distribution characteristics in the lighting device of embodiment 1 [Diagram 5] Simulation results of illuminance distribution in the lighting device of embodiment 1 [Figure 6] FIG. 1 is a plan view of a two-light distribution optical element of an illumination device according to a first embodiment, as viewed from the light exit surface side. [Figure 7] Simulation results of light distribution characteristics in the lighting device of embodiment 1 [Figure 8] Simulation results of illuminance distribution in the lighting device of embodiment 1 [Figure 9] FIG. 1 is a side cross-sectional view of the lighting device according to the first embodiment with the lamp body rotated; [Figure 10] Simulation results of illuminance distribution on a desk surface and a wall surface when the lamp body of the lighting device of the first embodiment is rotated [Figure 11] FIG. 11 is a schematic cross-sectional view showing the positional relationship between a light source, a reflector, and two light distribution optical elements of the lighting device according to the second embodiment. [Figure 12] Simulation results of the light distribution characteristics of the lighting device of the second embodiment [Figure 13] Simulation results of illuminance distribution of the lighting device of the second embodiment [Figure 14] 11 is a side cross-sectional view of a lighting device according to a third embodiment. [Figure 15] 11 is a side cross-sectional view of a lighting device according to a fourth embodiment. [Figure 16] 5 is a side cross-sectional view of an illumination device according to a fifth embodiment. [Figure 17] FIG. 13 is a plan view of the two light distribution optical elements and their mounting parts of the lighting device of the sixth embodiment, as viewed from the light exit surface side. [Figure 18] A simulation diagram of a hallway illuminated by the lighting device of the sixth embodiment. [Figure 19] 13A and 13B are a plan view and a cross-sectional view of a two-light-distributing optical element of an illumination device according to a seventh embodiment, as viewed from the light-emitting surface side. [Figure 20] Simulation results of illuminance distribution in the lighting device of embodiment 7 [Figure 21] FIG. 13 is a simulation diagram of the light distribution characteristic of the lighting device according to the seventh embodiment. [Figure 22] FIG. 13 is a plan view of the two light distribution optical elements of the lighting device of the eighth embodiment, as viewed from the light exit surface side. [Diagram 23] Simulation results of illuminance distribution in the lighting device of embodiment 8 [Figure 24] 13 is a simulation diagram of the light distribution characteristic of the lighting device according to the eighth embodiment. [Diagram 25] Chromaticity diagram to explain the chromaticity of LEDs [Figure 26] A cross-sectional view of a main part of a lamp body of an illumination device according to a ninth embodiment, in which a two-light distribution prism is used as a two-light distribution optical element. [Figure 27] A cross-sectional view of a main part of a lamp body of an illumination device according to a tenth embodiment, in which a two-light-distributing Fresnel prism is used as a two-light-distributing optical element. [Figure 28] A cross-sectional view of a main part of a lamp body of an illumination device according to an eleventh embodiment, in which a two-light-distributing multi-prism is used as a two-light-distributing optical element. [Figure 29] FIG. 12 is a cross-sectional view of a main part of a lighting device according to a twelfth embodiment, which is capable of changing the angle between two light distributions. [Diagram 30] FIG. 12 is an external view of the lamp body according to the twelfth embodiment. [Diagram 31] Cross-sectional view of the lamp body of embodiment 12. [Diagram 32] Calculation results of light distribution characteristics in the lighting device of embodiment 12 [Diagram 33] FIG. 12 is a cross-sectional view of a lamp body according to a modification of the twelfth embodiment. [Diagram 34] FIG. 13 is an external view of the main part of a lighting device according to a thirteenth embodiment, in which the angle between two light distributions can be changed by a motor. [Diagram 35] An interface for a lighting control device that controls the lighting device of the thirteenth embodiment [Diagram 36] FIG. 14 is an external perspective view of a lighting device (spotlight) according to a fourteenth embodiment. [Figure 37] Cross-sectional view of the lamp body of the fourteenth embodiment. [Figure 38] A cross-sectional view of a lamp body of a modified example of the 14th embodiment (with a multi-prism as an optional filter) [Figure 39] Illuminance distribution of the fourteenth embodiment and its modified example [Diagram 40] Cross-sectional view of the lamp body of the fifteenth embodiment [Diagram 41] Light beam in the lighting device of embodiment 15 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] <Embodiment 1> <Basic configuration> The lighting device 300 of this embodiment is a two-way light distribution type lighting device that performs a left light distribution BL and a right light distribution BR. A side cross-sectional view of the lighting device 300 installed in a hole 391 provided in a ceiling board of a ceiling 390 is shown in FIG.

[0025] A frame 310 that is installed in the hole 391 is provided with three mounting springs 312 (only one is shown in FIG. 1).

[0026] The lamp body fixing part 330 includes a light shielding plate 334 and is fixed to the frame 310 .

[0027] The lamp body 320 includes a heat sink 321, a light source 322 which is a COB type LED (the diameter of the light emitting part is 9 mm), a COB holder 323, a reflector 324, a dual light distribution lens 325 which is a dual light distribution optical element, a lamp body side surface 326, and a lamp body front surface 327. The distance H between the surface center of the light source 322 and the lower surface of the dual light distribution lens 325 is 28 mm. The lamp body 320 is mounted on a lamp body fixing part 330 so that the rotation in the axial direction and the tilt of the axis are variable.

[0028] The lighting device 300 also includes a power supply 340 , a terminal block 341 , a power supply block 342 , a wireless module 347 , a light line 348 , and a power supply line 349 .

[0029] <Installation work> To install the lighting device 300 on the ceiling 390, the following installation work is required: (1) drill a hole 391 in the ceiling 390, (2) if the electric light cord 348 is not prepared, install the electric light cord 348, (3) pull the electric light cord 348 out of the hole 391 and connect it to the terminal block 341, (4) place the power source 340 on the ceiling 390 through the hole 391, (5) attach the frame 310 to the hole 391, and (6) attach the lamp fixing part 330 and the lamp 320 to the frame 310. This requires labor and transportation costs. Therefore, reducing the installation space for the lighting device not only eliminates the clutter on the ceiling, but also reduces installation costs.

[0030] <Lighting control> The lighting device 300 can be wirelessly controlled by a lighting control device 370. The lighting control device 370 is, for example, a tablet, a smartphone, or a PC, and has lighting control software 371 (not shown) installed therein. A dimming and color adjustment signal is wirelessly transmitted from the lighting control device 370 by the lighting control software 371 in the lighting control device 370. The dimming and color adjustment signal is received by a wireless module 347 in the lighting device 300. The wireless module 347 transmits a control signal to the power source 340, and the power source 340 supplies driving power controlled by the control signal to the light source 322, which is a COB type LED, through a power supply line 349.

[0031] When the user wishes to change the lighting conditions, the lighting control can be manually changed using the lighting control device 370. In addition, a schedule can be preset in the lighting control software 371, and automatic control can be performed, for example, by lowering the brightness and color temperature of the lighting device 300 in the evening.

[0032] <Light and reflector> As an example of light rays in the lighting device 300, when looking at the component of the light distribution BL in the left direction as shown in FIG. 1, a light ray B emanating from the center of the light source, reflected by the reflecting mirror 324, and passing through the two-light distribution lens 325 is 14 and ray B that originates from the center of the light source and passes directly through the lens. 24 There is.

[0033] Ray B 11 is reflected by the reflecting mirror 324, and becomes a ray B 12 The light ray B enters the light distribution lens 325 as 123 and ray B passes through. 14 It is emitted as Ray B 21 is incident on the two-light distribution lens 325 and becomes a ray B 23 and ray B passes through. 24 It is emitted as

[0034] 2 shows a cross-sectional view of a plane including the optical axis AX to explain the reflecting mirror 324 and light rays of the lighting device 300. The reflecting mirror 324 is shaped to surround the optical axis AX, and specifically, is shaped axially symmetrical with respect to the optical axis AX. A commonly used reflecting mirror reflects the light of the light source in the optical axis direction, but the reflecting mirror 324 reflects the light ray B emitted from the light source center 322C on the optical axis. 11 is reflected by the reflecting mirror 324 and directed downward and to the left as a ray B having an angle of 25° with respect to the optical axis AX. 12 Therefore, the light B 13 The light ray B that is transmitted and emitted as 141, the light distribution component in the optical axis AX direction is reduced because the light is distributed outward from the optical axis AX direction. By combining reflecting mirror 324 and dual light distribution lens 325, it is possible to realize lighting device 300 that suppresses light in the optical axis AX direction and distributes light in two directions oblique to the optical axis.

[0035] The light ray B reflected by the reflecting mirror 324 12 It is preferable that the angle be 5 degrees or more, and more preferably 10 degrees or more, outward with respect to the optical axis AX. The reflected light beam does not need to be a parallel beam in a cross-sectional view including the optical axis AX.

[0036] <2. Light distribution lens and light distribution characteristics (1)> Fig. 3(b) shows a plan view of the dual light distribution lens 325 as viewed from the light emission surface side. Figs. 3(a) and (b) respectively show dual light distribution lenses 325S and 325T which are variations of the interval Lc (described later) between the dual light distribution lenses 325. In Figs. 3(a), (b), and (c), the horizontal direction is the x direction and the vertical direction is the y direction. Below, the dual light distribution lens 325 shown in Fig. 3(b) will be described as a representative example.

[0037] The external shape of the two light distribution lenses 325 (two light distribution lenses 325S, 325T) is circular. Therefore, a component for a conventional downlight that distributes light in one direction, specifically, for example, the light body 320, can be used.

[0038] The upper surface (light exit surface) of the dual light distribution lens 325 is divided into a left convex lens region 325(1) which is a left light distribution region on one side (left side) in the x direction, a right convex lens region 325(2) which is a right light distribution region on the other side (right side), a first scattering region 325(3), and a second scattering region 325(4). The left convex lens region 325(1) and the right convex lens region 325(2) are convex lenses (virtual light distribution regions) having imaginary contours shown by dotted lines, which are cut out by the contour of the dual light distribution lens 325 and are regions up to the center line V so as not to overlap with other convex lens regions. In this embodiment, the left convex lens region 325(1) and the right convex lens region 325(2) are symmetrical with respect to the center line V.

[0039] The diameter of the two light distribution lenses 325 is 48 mm, and the diameters of the virtual circular outlines of the left convex lens region 325(1) and the right convex lens region 325(2) shown by dotted lines are both 45 mm. 1 and the center line J of the right convex lens area 325(2) 2 The distance Lc between them is 30 mm. The lower surface (light incidence surface) of each of the two light distribution lenses 325 (325S, 325T) is flat.

[0040] On the upper surface of two-light-distributing lens 325, in order to suppress color unevenness when a light source emitting multiple colors is used, left convex lens region 325(1) and right convex lens region 325(2) are provided with a textured pattern for light scattering, and first scattering region 325(3) and second scattering region 325(4) are provided with a linear uneven structure.

[0041] FIG. 3(a) shows a two-light-distributing lens 325S. The center line J of the left convex lens region 325S(1) 1 and the center line J of the right convex lens area 325S(2) 2 The distance Lcs between the left and right convex lens regions 325S(1) and 325S(2) is widened to 40 mm. As a result, the overlap between the left and right convex lens regions 325S(1) and 325S(2) is small, and the first scattering region 325S(3) and the second scattering region 325S(4) are widened.

[0042] FIG. 3(c) shows a two-light-distribution lens 325T. The center line J of the left convex lens region 325T(1) 1 and the center line J of the right convex lens area 325T(2) 2 The interval Lct between the left and right convex lens regions 325T(1) and 325T(2) is narrowed to 20 mm. As a result, the overlap between the left and right convex lens regions 325T(1) and 325T(2) is increased, and first scattering region 325T(3) and second scattering region 325T(4) are narrowed.

[0043] Figures 4(a), (b), and (c) show the simulation results of the light distribution characteristics in the x direction (luminous intensity versus beam angle) when the total luminous flux of the light source is 1000 lm.

[0044] In the case of the dual light distribution lens 325 shown in Fig. 4(b), it can be seen that there is a peak in the light distribution in the left and right 16° directions, and the luminous intensity in the 0° direction (center direction) is about half that (43%). In this way, by not having a peak in the light distribution in the 0° direction and setting the luminous intensity in the 0° direction to 70% or less of the peak, the two light distributions are clearly separated, making this a light source that is easy to use for the purpose of illuminating two directions. In addition, by setting the luminous intensity in the 0° direction to 20% or more of the peak, it is possible to appropriately reduce the illumination so that the center direction does not feel dark, which is convenient.

[0045] In the case of the dual light distribution lens 325S in FIG. 4(a), the light distribution has peaks in the left and right directions of 20° each, and the light distribution in the 0° direction is about 10% of the peak, and it can be seen that the light distribution is clearly separated in two directions.

[0046] In the case of the dual light distribution lens 325T in FIG. 4(c), it is seen that the light distribution has peaks at 10° to the left and right, and the light distribution in the 0° direction is 82% of the peak, so there is not much drop off.

[0047] Figures 5(a), (b), and (c) show the simulation results of the illuminance distribution at a distance of 2.8 m from the light source when the total luminous flux of the light source is 1000 lm. The horizontal direction of each figure is the x direction, and the vertical direction is the y direction, and the numerical values ​​in the figures are illuminance (lx).

[0048] In the case of the dual light distribution lens 325 in FIG. 5(b), it can be seen that there are two clear spot illumination areas aligned in the x direction.

[0049] In the case of the dual light distribution lens 325S in FIG. 5(a), it can be seen that there are two clear spot illumination areas aligned in the x direction, and the area between them is dark.

[0050] In the case of the dual light distribution lens 325T in FIG. 5(c), the illumination area is elongated horizontally in the x direction. Although this differs from the original objective of obtaining two illumination areas using two light distributions, a relatively uniform horizontal illumination area is achieved.

[0051] From the above, in order to illuminate two regions separately, it is preferable that the dual-light-distributing lens has two convex lens regions on the light-exiting surface, the light-incident surface, or both, and that the two convex lens regions are spaced apart to a certain degree. Specifically, the ratio of the center-to-center distance between the two convex lens regions to the diameter of the dual-light-distributing lens is preferably 45% or more, and more preferably 60% or more. On the other hand, if they are too far apart, the area of ​​the first and second scattering regions other than the convex lens regions increases, so it is preferably 100% or less, and more preferably 80% or less.

[0052] <2. Light distribution lenses and light distribution characteristics (2)> Fig. 6(b) shows a plan view of dual light distribution lens 325 seen from the light output surface side. Figs. 3(a) and (c) respectively show dual light distribution lenses 325M and 325N which are variations in the virtual diameters of convex lens regions 325(1) and (2) of dual light distribution lens 325. In Figs. 6(a), (b), and (c), the horizontal direction is the x direction and the vertical direction is the y direction.

[0053] The diameter of the two light distribution lenses 325 is 48 mm, and the diameters of the outlines (circles) of the imaginary light distribution areas of the left convex lens area 325(1) and the right convex lens area 325(2) shown by dotted lines are 55 mm, 45 mm, and 30 mm for the two light distribution lenses 325M, 325N, and 325N, respectively. The left convex lens area 325(1) and the right convex lens area 325(2) have the portions of their imaginary outlines shown by dotted lines that extend beyond the two light distribution lenses 325 cut out, and the left convex lens area 325(1) and the right convex lens area 325(2) having imaginary circular outlines are formed up to the center line V. The center line J of the left convex lens area 325(1) 1 and the center line J of the right convex lens area 325(2) 2 The distance Lc between them is 30 mm. The lower surfaces (light incidence surfaces) of the two light distribution lenses 325M, 325 and 325N are flat.

[0054] FIG. 6(a) shows a two-beam lens 325M. The center line J of the left convex lens area 325M(1) 1 and the center line J of the right convex lens area 325M(2) 2 The spacing Lc is 30 mm, but since the diameter of the imaginary outer shape (circle) of left convex lens region 325M(1) and right convex lens region 325M(2) has become large at 55 mm, first scattering region 325M(3) and second scattering region 325M(4) have almost disappeared.

[0055] FIG. 6(c) shows a two-light-distributing lens 325N. The center line J of the left convex lens region 325N(1) 1 and the center line J of the right convex lens area 325N(2) 2 The spacing Lc is 30 mm, but since the diameter of the imaginary outer shape (circle) of left convex lens region 325N(1) and right convex lens region 325N(2) is small at 35 mm, first scattering region 325N(3) and second scattering region 325N(4) are wide.

[0056] 7(a), (b), and (c) show the simulation results of the light distribution characteristics in the x direction when the total luminous flux of the light source is 1000 lm.

[0057] The angles at which the light distribution peaks in Figures 7(a), (b), and (c) are 14°, 18°, and 20° to the left and right of the center, respectively, and the luminous intensity toward the center is 47%, 43%, and 38%, respectively, of the luminous intensity at the angles at which the light distribution peaks.

[0058] Figures 8(a), (b), and (c) show the simulation results of the illuminance distribution at a distance of 2.8 m from the light source when the total luminous flux of the light source is 1000 lm. The horizontal direction of each figure is the x direction, and the vertical direction is the y direction, and the numerical values ​​in the figures are illuminance (lx).

[0059] 8(a), (b), and (c), it can be seen that two separate locations in the x direction are illuminated. However, in FIG. 8(c), the illuminance is slightly reduced. This is thought to be due to an increase in the proportion of first scattering region 325N(3) and second scattering region 325N(4), which are not convex lens regions.

[0060] From the above, the ratio of the convex lens area to the two light distribution lens diameters is suitably 60% or more and 120% or less, and more preferably 80% or more and 110% or less (light is used more efficiently).

[0061] <Use as a universal downlight> 9 is a diagram showing a state in which the light distribution direction is changed by rotating the light body 320 relative to the frame 310 and the light body fixing part 330 in the lighting device 300. Since the lighting device 300 is a downlight (universal downlight) whose light distribution direction can be changed, for example, the light distribution BL can be a downward illumination and the light distribution BR can be an oblique illumination.

[0062] FIG. 10(a) shows a simulation result of illuminance distribution on a desk 382 placed on a floor 380 when the total luminous flux of the light source of the lighting device 300 is 1000 lm, the lighting device is oriented as shown in FIG. 9, and the desk 382 is illuminated with light distribution BL. FIG. 10(b) shows a simulation result of illuminance distribution on a wall 385 when the wall 385 is illuminated with light distribution BR, and FIG. 10(c) shows a simulation result of illuminance distribution on a surface at the height of the desk 382 when the desk 382 is illuminated with light distribution BL. The numerical values ​​in the figure are illuminance (lx). The ceiling height is 2.80 m. In reality, the total luminous flux of the light source of the lighting device 300 is about 1000 lm, so it was found that an illuminance of about 500 lx, which is preferred in restaurants, can be obtained on the desk 382 and on the wall 385.

[0063] <Embodiment 2> <Light source, reflector, and lens configuration> In this embodiment, as a variation of the first embodiment, a case is shown in which the distance between the light source 322 and the dual light distribution lens 325, which is a dual light distribution optical element, is changed. This makes it possible to change the angle between the two light distribution directions (also referred to as the "angle between the two light distributions" for simplicity).

[0064] 11(a), (b), and (c) are schematic cross-sectional views including the optical axis of the illumination devices 300A, 300, and 300C, showing the positional relationship between the light source, reflector, and dual light distribution lens when the distance from the light source 322 to the bottom surface of the dual light distribution lens 325 is changed to three different values ​​of 40 mm, 28 mm, and 14 mm ((b) is the same as in embodiment 1). The horizontal direction in each drawing is the x direction, and the vertical direction is the z direction. Note that the illumination devices 300A and 300C use reflectors 324A and 324C, respectively, and the length of the lamp body is changed accordingly, but the other configurations are the same as the illumination device 300.

[0065] 12(a), (b), and (c) show the results of simulating the light distribution characteristics of the lighting devices 300A, 300, and 300C. The lighting device 300A has two strong light distributions at 14° from the center, while the lighting device 300C has a strong light distribution at 35°. It can be seen that the luminous intensity in the center direction relative to the luminous intensity in the light distribution peak direction is 41% and 14% for the lighting devices 300A and 300C, respectively. Note that the lighting device 300C has less light distribution in the 0° direction, but this is because the dual light distribution lens 325 used for the lighting device 300 is used; it is possible to adjust the amount of light distribution in the 0° direction by redesigning the lens.

[0066] Figures 13(a), (b), and (c) show the simulation results of the illuminance distribution of lighting devices 300A, 300, and 300C when the total luminous flux of the lighting device's light source is 1000lm and the distance from the lighting device to the floor surface is 2.8m. In each figure, the horizontal direction is the x direction and the vertical direction is the y direction, and the numerical values ​​in the figure are illuminance (lx). Lighting devices 300A, 300, and 300C all show an illuminance distribution that is separated into two in the x direction, and it can be seen that the smaller H is, the more distant the location is illuminated.

[0067] <Embodiment 3> Illumination device 300D, the cross-sectional view of the main part of which is shown in FIG. 14, is a variation of illumination device 300C, and uses a dual-light-distribution lens 325D. Dual-light-distribution lens 325D has two convex lens regions formed on the light-entering surface side (light source 322 side), and the light-exiting surface side is flat. As a result, light ray B 51 But the reflected ray B 52 , 2 Ray B after entering the 325D light distribution lens 53 , 2Light ray B after exiting from the 325D light distribution lens 54 So, it can be used effectively.

[0068] In lighting device 300C, the illuminance in the center of the illuminance distribution was low, but in dual-light-distributing lens 325D having two convex lens regions, as shown in embodiment 1, the light distribution can be optimized by changing the center distance of the two convex lens regions, or by changing the focal length of the convex lens regions, or by increasing the light diffusion properties by using a grained shape, etc.

[0069] <Embodiment 4> Illumination device 300G, the cross-sectional view of a main part of which is shown in Fig. 15, is a variation of illumination device 300, and uses a dual-light-distribution lens 325G. Dual-light-distribution lens 325G has a shape obtained by bending dual-light-distribution lens 325, and optical axis RX(1) of left-convex lens region 325G(1) and optical axis RX(2) of right-convex lens region 325G(2) pass near light source center 322C of light source 322 and are oblique to the optical axis of the light source.

[0070] The light incidence surface of the two-light distribution lens 325G may be bent as shown in the figure, but may also be flat or curved.

[0071] <Embodiment 5> Illumination device 300F, the cross-sectional view of a main part of which is shown in Fig. 16, is a variation of illumination device 300, and uses a dual-light-distribution lens 325F. Dual-light-distribution lens 325F has left-convex lens area 325F(1) and right-convex lens area 325F(2) in a Fresnel lens shape as shown in the figure. This allows the lens to be made thinner and lighter.

[0072] A diffusion shape such as a textured shape to prevent color unevenness may be superimposed on the Fresnel lens shape. Since providing both a Fresnel lens shape and a diffusion shape results in a very complicated shape, for example, the light exit surface side may be provided with a Fresnel lens shape and the light entrance surface side may be provided with a textured shape.

[0073] <Embodiment 6> In the sixth embodiment, a dual light distribution lens 325E, which is a dual light distribution optical element, is removably attached in the installed state of the lighting device 300E. There are various methods for attaching and detaching only the dual light distribution lens 325E without removing the lighting device 300E, but as an example, as shown in Fig. 17, which is a plan view seen from the light emission surface side, a mounting part 325E(5) is provided on the lens 325E, and a screw fixing part 325E(6) provided on the mounting part 325E(5) is fixed to two screws 328 provided on the light body front surface 327E of the lighting device 300E. E This is an example of how to fit the screw 328 into the hole and secure it in place. E By loosening the fastener and rotating the dual light distribution lens 325E counterclockwise, the dual light distribution lens 325E can be removed and replaced with another dual light distribution lens to obtain the desired light distribution characteristics. Therefore, after installing the lighting device 300E, it is possible to obtain the light distribution characteristics according to the purpose by replacing only the dual light distribution lens 325E.

[0074] As for other attachment and detachment methods, for example, a frame with a screw (thread groove) may be used, and a matching groove may be provided on the front of the receiving light body to fix the lens with the frame. A mount may be provided on the lighting device, like an interchangeable lens for a single-lens reflex camera, and the lens fixed to the frame may be attached to the mount.

[0075] 18 is a simulation diagram of a case where a hallway is illuminated by lighting device 300E. Lighting device 300E, which is a downlight with a fixed light distribution direction, is installed on ceiling 390E of the hallway and illuminates walls 385EL and 385ER of the hallway, and floor 380E of the hallway.

[0076] Since the lighting device 300E has a light distribution characteristic that distributes light mainly on the left side light distribution BL and the right side light distribution BR, the walls on both sides become bright, and pedestrians can feel the hallway is bright. Therefore, a lighting device with a small total luminous flux can be used for the lighting device 300E, which saves energy.

[0077] When installed in a hallway in this manner, the two detachable light distribution lenses 325E can be replaced with appropriate ones depending on the width of the hallway and the height of the ceiling.

[0078] <Embodiment 7> The lighting device 300U of this embodiment is obtained by replacing the dual light distributing lens 325 of the first embodiment with a dual light distributing lens 325U. 9 (a) The cut Figure 1 shows the surface diagram 9 As shown in (b).

[0079] The upper surface (light exit surface) of the two-light distribution lens 325U is divided into a left-convex lens region 325U(1) on one side (left side) in the x direction, a right-convex lens region 325U(2) on the other side (right side), a first scattering region 325U(3), and a second scattering region 325U(4). The left-convex lens region 325U(1) and the right-convex lens region 325U(2) are regions up to the center line V such that convex lenses having imaginary contours shown by dotted lines are cut out by the contour of the two-light distribution lens 325U and do not overlap with other convex lens regions. In this embodiment, the left-convex lens region 325U(1) and the right-convex lens region 325U(2) are symmetrical with respect to the center line V.

[0080] On the upper surface of dual light distribution lens 325U, in order to suppress color unevenness when a light source emitting multiple colors is used, multiple linear convex portions 325U(2)s aligned in the x direction (one direction) are provided in left-convex lens region 325U(1) and right-convex lens region 325U(2) and arranged in the y direction (the other direction). center line J 2 19(b), which is a cross-sectional view taken along the line 19A, the light ray B y1 , B y2 As a result of the light being refracted slightly in the y direction, the light is diffused in the y direction. Note that the light incident surface 325U(0), which is the lower surface of the dual light distribution lens 325U, is a flat surface as shown in FIG.

[0081] Figure 20 shows the simulation results of the illuminance distribution at a distance of 2.8 m from the light source when the total luminous flux of the light source is 1000 lm. The values ​​in the figure are illuminance (lx). For example, compared to Figure 5(b), it can be seen that the light spreads in the y direction (the vertical direction in the figure), and the illuminance value decreases accordingly.

[0082] 21 shows the results of a simulation of the light distribution characteristics of the illumination device 300U. In the illumination device 300U, the two light distributions are strong in the direction of 20° from the center, and the luminous intensity in the center direction is 3% of the luminous intensity in the direction of the peak of the light distribution, meaning that the light distribution in the 0° direction is small.

[0083] Note that a plurality of recesses may be provided in place of the plurality of protrusions 325U(2)s along one direction. The one direction does not need to be strictly the same direction, and is not limited to the x direction.

[0084] <Embodiment 8> Illumination device 300W of the present embodiment replaces dual light distribution lens 325 of embodiment 1 with dual light distribution lens 325W, achieving bright illumination in a relatively narrow area and illumination of a certain degree of brightness in a relatively wide area with a single illumination device.

[0085] A plan view of dual-light-distributing lens 325W as viewed from the light-emitting surface side is shown in Fig. 22. The upper surface (light-emitting surface) of dual-light-distributing lens 325W is divided into left-convex lens region 325W(1) on one side (left side) in the x-direction, right-convex lens region 325W(2) on the other side (right side), first scattering region 325W(3), and second scattering region 325W(4). Left-convex lens region 325W(1) and right-convex lens region 325W(2) are each formed by convex lenses having imaginary outer shapes indicated by dotted lines. W The left convex lens region 325W(1) and the right convex lens region 325W(2) are cut out by the outer shape of the left convex lens region 325W(1) and the right convex lens region 325W(2) and are cut out by the outer shape of the right ...).

[0086] In this embodiment, the light scattering shapes on the surfaces of the left convex lens region 325W(1) and the right convex lens region 325W(2) are made different. The left convex lens region 325W(1) has the same texture shape as the left convex lens region 325(1). On the other hand, the right convex lens region 325W(2) has a plurality of linear convex portions 325U(2)s aligned in the y direction, the same as the right convex lens region 325U(2).

[0087] Figure 23 shows the results of a simulation of the illuminance distribution at a distance of 2.8 m from the light source when the total luminous flux of the light source is 1000 lm. The values ​​in the figure are illuminance (lx). The left side shows a relatively circular illumination area, while the right side shows a vertically elongated illumination area due to scattering by multiple protrusions 325U(2)s.

[0088] 24 shows the results of a simulation of the light distribution characteristics of the lighting device 300U. In the lighting device 300U, the two light distributions are strong in the directions of 15° to the left and 20° to the right of the center, and the luminous intensity in the direction of the center is 22% of the luminous intensity in the direction of the peak of the light distribution.

[0089] <Embodiment 9> In this embodiment, a two-light distributing prism 125 is used as the two-light distributing optical element.

[0090] <Basic configuration> Fig. 26(a) shows a cross-sectional view of a main part of the light body 120 of the lighting device 100 of this embodiment. See also Fig. 26(b), which is a plan view, the two-light distributing prism 125 has a flat incident surface, and is made up of a left light distribution region 125L whose exit surface is an inclined flat surface that forms an angle with the incident surface, and a right light distribution region 125R whose exit surface is an inclined flat surface that forms an angle with the incident surface. The two-light distributing prism 125 functions as a prism depending on the angle between the exit surface and the incident surface.

[0091] Light ray B emitted by light source 122 P1 and B. P2 The light ray B emitted from the light source 122 is incident on the two-light distribution prism 125, and its traveling direction is changed to a direction away from the optical axis AX and emitted to the outside. P3After being reflected by reflector 124, it enters dual light distribution prism 125, where its traveling direction is changed away from optical axis AX and emitted to the outside. By distributing the light in different directions in left light distribution region 125L and right light distribution region 125R, it is possible to realize a dual light distribution in lighting device 100 in which a stronger light intensity is obtained in two directions different from the optical axis direction than in the optical axis direction.

[0092] <Embodiment 10> In this embodiment, a two-light-distributing Fresnel prism 225 is used as the two-light-distributing optical element.

[0093] <Basic configuration> FIG. 27(a) shows a cross-sectional view of the main part of the light body 220 of the lighting device 200 of this embodiment. The two-light-distribution Fresnel prism 225, referring to FIG. 27(b) which is a plan view, has a flat exit surface, and includes a left light-distribution region 225L consisting of a plurality of inclined planes whose entrance surface forms an angle with the exit surface, and a right light-distribution region 225R consisting of a plurality of inclined planes whose exit surface forms an angle with the entrance surface. The two-light-distribution Fresnel prism 225 functions as a prism due to the angle between the exit surface and the entrance surface, and has a cross section in a sawtooth shape so as to keep the thickness thin, unlike a Fresnel lens. Therefore, the two-light-distribution Fresnel prism 225 is lighter than the two-light-distribution prism 125. The number of inclined planes may be any number, and although FIG. 27 shows a number of inclined planes that is significantly less than that of the prototype due to the relationship of the illustration, the number may be about this number (eight planes on one side) or may be even less in practice.

[0094] Light ray B emitted by light source 222 FP1 and B. FP2 The light ray B emitted from the light source 222 is incident on the two-beam Fresnel prism 225, and its traveling direction is changed to a direction away from the optical axis AX and emitted to the outside. FP3After being reflected by reflecting mirror 224, the light enters dual-light-distribution Fresnel prism 225, where its traveling direction is changed away from optical axis AX and emitted to the outside. By distributing the light in different directions in left light distribution region 225L and right light distribution region 225R, it is possible to realize a dual light distribution in lighting device 200 in which a stronger light intensity is obtained in two directions different from the optical axis direction than in the optical axis direction.

[0095] <Embodiment 11> In this embodiment, a two-light-distributing multi-prism 425 is used as the two-light-distributing optical element.

[0096] <Basic configuration> FIG. 28(a) shows a cross-sectional view of a main part of a light body 420 of a lighting device 400 of this embodiment. The two-light-distribution multi-prism 425 has a flat exit surface, and is formed of a pattern in which a plurality of inclined surfaces 425R and 425L, in which the entrance surface forms an angle with the exit surface, are alternately repeated, as shown in FIG. 28(b), which is a plan view. The two-light-distribution multi-prism 425 functions as a multi-prism due to the angle between the exit surface and the inclined surface 425R or the inclined surface 425L, and also keeps its thickness thin. Therefore, the two-light-distribution multi-prism 425 is lighter than the two-light-distribution prism 125. Note that any number of inclined planes may be used, and while FIG. 28 shows a number of inclined planes that is significantly less than that of the prototype for ease of understanding, the number may be about the same or even less in practice.

[0097] Light ray B emitted by light source 422 MPR2 and B. MPL2 The light ray B is incident on the entrance faces 425R and 425L of the two-beam-distribution multi-prism 425, respectively, and its traveling direction is changed to a direction away from the optical axis AX and emitted to the outside. As a result, even if the two-beam-distribution multi-prism 425 is on the right side of the optical axis AX, the light ray B MPL1 Even if the two-beam multi-prism 425 is on the left side of the optical axis AX, the light ray B MPR3 In this way, by distributing light in different directions, it is possible to realize two light distributions in the lighting device 400, in which a stronger light intensity is obtained in two directions different from the optical axis direction than in the optical axis direction.

[0098] In the ninth, tenth, and eleventh embodiments, one of the surfaces is a flat surface, but this flat surface may be a curved surface in the shape of a convex lens to provide a convex lens effect. This has the effect of increasing the light collecting ability. In the ninth embodiment, when the light exit surface is a curved surface in the shape of a convex lens, it becomes similar to the two-light distribution lens 325 shown in the first embodiment, for example.

[0099] In addition, in all of the ninth, tenth, and eleventh embodiments, at least one of the light exit surface and the light entrance surface may be formed with a light scattering shape such as the above-mentioned grained shape for light scattering, thereby reducing unevenness in color and light intensity of the illumination light.

[0100] <Embodiment 12> In this embodiment, a universal downlight is provided as a lighting device capable of continuously changing the angle between two light distributions by continuously changing the distance H from the light source to the light distribution lens.

[0101] <Basic configuration> 29 shows a cross-sectional view of a main part of a lighting device 500 of this embodiment. The lighting device 500 includes a frame 510, a lamp body fixing part 530 fixed to the frame 510, a lamp body 520 rotatably fixed to the lamp body fixing part 530, and a power source and the like similar to those of the first embodiment (see FIG. 1).

[0102] FIG. 30 shows an external view of a lamp body 520, which is a main part of a lighting device 500 of this embodiment. The lamp body 520 includes a heat sink 521, a light source 522 (described in a cross-sectional view below) that is a COB type LED attached to the heat sink 521, a lens barrel 523, and a two-light distribution lens 525 attached to the lens barrel 523. The lens barrel 523 is attached to a lamp body fixing part 530 so that the rotation in the axial direction of the lamp body and the tilt of the axis are variable. This results in a lighting device 500 that mainly emits light in the BL direction and light in the BR direction. There are a slit 533 and a fixing screw 534 on the front side of the lens barrel 523 and on the back side, which is not visible in this figure. The fixing screw 534 is attached to a screw receiver 536 integrated with the heat sink 521 so as to tighten the lens barrel 523, thereby fixing the positions of the lens barrel 523 and the heat sink 521. Thereby, the distance H between the lower surface of dual light distribution lens 525 attached to lens barrel 523 and the surface of light source 522 attached to heat sink 521 is adjusted and fixed.

[0103] 31(a), (b), and (c) are cross-sectional views of the lighting body 520 when the distance H between the upper surface of the light source 522 and the lower surface of the dual light distribution lens 525 is Ha, Hb, and Hc, respectively. Note that only one fixing screw 534 and one screw receiver 536 that receives the same are shown, and the slit 533 is not shown.

[0104] In order to change the distance between light source 322 and dual light distribution lens 325, the reflecting mirror is divided into two: rear reflecting mirror 524L which can move integrally with light source 322, and front reflecting mirror 524U which can move integrally with dual light distribution lens 325.

[0105] The height H along the optical axis AX from a virtual plane including the upper end of the rear reflecting mirror 524L to the light source 322 L In the case of FIG. 31(c) where the distance Hc is the shortest, the rear reflecting mirror 524L and the dual light distribution lens 325 are positioned so as not to interfere with each other. L It is preferable that Hc is less than or equal to Hc.

[0106] The height H along the optical axis AX from a virtual plane including the lower end of the front reflecting mirror 524U to the lower surface of the two light distribution lenses 325 UIn the case of FIG. 31(c) where the distance Hc is the shortest, the positions of the front reflecting mirror 524U and the light source 322 are set so as not to interfere with each other. U It is preferable that H′c≦Hc. If there is an obstacle to the front reflector 524U, such as a light source holder or a reflector stand, near the light source 322, the distance from the obstacle to the two light distribution lenses 325 is H′c. U It is preferable that the value is equal to or smaller than H'c.

[0107] Height H of rear reflector 524L L and the height H of the front reflector 524U U The sum of these may be equal to or greater than the distance Ha, which is the maximum value of the distance H, as shown in FIG.

[0108] In this embodiment, the basic design is such that when the distance H is at its maximum, namely Ha, the reflective surfaces of the front reflecting mirror 524U and the rear reflecting mirror 524L are continuous. However, since the reflecting mirrors have thickness, the upper end 524U2 of the reflective surface of the front reflecting mirror 524U is positioned slightly outward with respect to the optical axis AX than the upper end 524L1 of the reflective surface of the rear reflecting mirror 524L.

[0109] 31(a), (b), and (c), as distance H is reduced, rear reflecting mirror 524L comes inside the area surrounded by front reflecting mirror 524U. Also, heat sink 521 comes inside lens barrel 523.

[0110] Fig. 32 shows calculation results of light distribution characteristics of the lighting device 500 of this embodiment when the distance H is Ha, Hb, and Hc. The angle between the two light distributions is 40° (20° left and right of the optical axis AX) in Fig. 32(a), 48° (24° left and right) in Fig. 32(b), and 52° (26° left and right) in Fig. 32(c).

[0111] In this embodiment, the lighting device 500 is a universal downlight whose lamp body can be oriented in a different direction, but the lighting device may be a downlight whose lamp body cannot be oriented in a different direction. Even in this case, the lighting device can be installed in a hallway to illuminate two opposing walls, or can be installed between two shelves in a store to illuminate both shelves with a single lighting device.

[0112] <Variation 1> 33(a), (b) and (c) are cross-sectional views of a lamp body 520B in which the rear reflecting mirror 524L and the front reflecting mirror 524U in the lamp body 520 of the lighting device 500 are replaced with a rear reflecting mirror 524BL and a front reflecting mirror 524BU.

[0113] In this modification, the rear reflecting mirror 524BL is designed so that, when the distance Hc is the minimum value of the distance H, a light ray RX that is emitted from the light source center 522C of the light source 522 and passes through the upper end of the rear reflecting mirror 524L reaches the right and left ends of the two light distribution lens 525 (FIG. 33(c)). Therefore, the light distribution characteristic in the case of the distance Hc approaches that of the second embodiment in which the reflecting mirror is not divided, and the angle between the two light distributions is increased.

[0114] Accordingly, when the distance H is at its maximum value, distance Ha, as shown in Figure 33(a), the lower end 524BU2 of the front reflecting mirror 524BU needs to be positioned further outward with respect to the optical axis AX than the upper end 524BL1 of the rear reflecting mirror 524BL. As a result, the inclination of the reflecting surface of the front reflecting mirror 524BU becomes steeper and is not continuous with the reflecting surface of the rear reflecting mirror 524BL, but the effect of this is limited.

[0115] To summarize the preferred rear reflecting mirrors and front reflecting mirrors based on the findings of the above embodiment and the modified examples, the height H of the rear reflecting mirrors 524L and 524BL is as follows: L and the height H of the front reflector exemplified by the front reflectors 524U and 524BU. U is preferably equal to or shorter than Hc when the distance H is at its minimum. U and height H LThe sum of is preferably equal to or greater than Ha when the distance H is at its maximum.

[0116] <Embodiment 13> In the twelfth embodiment, the distance H can be changed manually, but in this embodiment, the distance H can be changed by a motor. In that case, even after the lighting device is installed, it is possible to change the distance H to change the angle between the two light distributions.

[0117] Fig. 34 shows an external view of a lamp body 520V which is a main part of a lighting device 500V of this embodiment. The lamp body 520V includes a heat sink 521, a light source 522 which is a COB type LED attached to the heat sink 521 (explained in a cross-sectional view described later), a lens barrel 523, and a dual light distribution lens 525 attached to the lens barrel 523. The lens barrel 523 is attached to a lamp body fixing part 530 so that the rotation of the axial direction of the lamp body and the tilt of the axis are variable. This results in a lighting device 500 which mainly emits light in the BL direction and light in the BR direction. There are slits 533 and guide pins 535 on the front side of the lens barrel 523 and on the back side which is not visible in this figure.

[0118] And, lighting body 520V includes motor 551 fixed to heat sink 521, feed screw shaft 552 with a screw at its tip that transmits the rotation of motor 551, and screw receiver 553 that receives the tip of feed screw shaft 552. Screw receiver 553 is attached to lens barrel 523, and when the motor rotates, feed screw shaft 552 rotates, so that screw receiver 553 and lens barrel 523 move back and forth with guide pin 535 in slit 533, and distance H between the surface of light source 522 and the bottom surface of dual light distribution lens 525 can be changed.

[0119] The motor 551 is controlled by a lighting control device 570V which is a modified example of the lighting control device 370 shown in Fig. 1. Fig. 35 shows a touch panel which is an interface of the lighting control device 570V. On the touch panel, a two light distribution angle interface 573A can be displayed in addition to a color adjustment interface 573C and a dimming interface 573B by the installed lighting control software 571. In the two light distribution angle interface 573A, the two light distribution angle can be changed by moving a setting point 574A2 on a slide bar 574A1 (minimum 30°, maximum 60° in the figure), and the set angle is displayed as a set angle display 574A3 (45 degrees between two light distributions in the figure). In addition, in color adjustment interface 573C, the color temperature can be changed by moving set point 574C2 on slide bar 574C1 (minimum 2700K, maximum 6500K in the figure), and the set color temperature is displayed as set color temperature display 574C3 (6500K in the figure). In dimming interface 573B, the dimming rate can be changed by moving set point 574B2 on slide bar 574B1 (minimum 0%, maximum 100%) in the figure, and the set dimming rate is displayed as set dimming rate display 574B3 (80% in the figure).

[0120] <Embodiment 14> The lighting device 700 of this embodiment is a spotlight capable of continuously changing the angle between two light distributions.

[0121] As shown in FIG. 36(a), which is an external perspective view, the lighting device 700 includes a lamp body 720 consisting of a rear lamp body 720L and a front lamp body 720U. With the distance between the rear lamp body 720L and the front lamp body 720U changed, the mounting screw 734 protruding through the slit 733 can be tightened to fix the distance between the two lamp bodies. As a result, as shown in FIG. 36(b), the intermediate lamp body 720E between the rear lamp body 720L and the front lamp body 720U becomes visible. The rear lamp body 720L is connected to the arm 730 so as to be rotatable in the φ direction, and the arm 730 is connected to the power source 740 so as to be rotatable in the ψ direction, thereby changing the direction of the lamp body 720. The power source 740 can be detachably fixed to the lighting rail 790 by turning the lever 745 at the connection part 746 and the connection part 747. The lighting device 700 can adjust the brightness and color by a lighting control device 770 (such as a smartphone, tablet, or PC) that has lighting control software 771 installed. The angle θ between the two light distributions can also be controlled using a structure like the embodiment described above, but the following describes a structure that allows the angle θ between the two light distributions to be manually changed.

[0122] Figure 37 is a cross-sectional view showing the inside of the lamp body 720. By changing the distance between the light source 722, which is part of the rear lamp body 720L, and the two-light distribution lens 725, which is part of the front lamp body 720U, as shown in Figures 37(a), (b), and (c), the angle θ of the light distribution BL in the left diagonal direction and the light distribution BR in the right diagonal direction (the angle θ between the two light distributions) can be changed.

[0123] The rear lamp 720L includes a heat sink 721, a light source 722 attached to the heat sink 721, and a rear reflector 724L, and is provided with a slit 733 as shown in FIG.

[0124] The front light body 720U includes an intermediate light body 720E, a mounting screw 734 attached to the intermediate light body 720E, a front reflecting mirror 724U, and two light distribution lenses 725.

[0125] By reducing the distance between the rear lamp 720L and the front lamp 720U as shown in Figures 37(a), (b), and (c), the distance between the light source 722 and the two light distribution lenses is reduced, and the rear reflecting mirror 724L enters the area surrounded by the front reflecting mirror 724U. This makes it possible to change the angle θ between the two light distributions.

[0126] <Modification> In this modification, a multi-prism 726, which is an optional filter, is attached to a light body 720 of an illumination device 700.

[0127] Fig. 38 is a cross-sectional view showing the inside of a lighting body 720F, which is a lighting body equipped with a multi-prism 726. By changing the distance H between the light source 722, which is a part of the rear lighting body 720L, and the bottom surface of the dual light distribution lens 725, which is a part of the front lighting body 720U, from Ha in Fig. 38(a) to Hc in Fig. 38(c), the angle θ of the left diagonal light distribution BL and the right diagonal light distribution BR (the angle θ between the two light distributions) can be changed from θa to θc.

[0128] Here, the multi-prism 726 separates the light distribution BL into BL1 facing left and BL2 facing toward the center, and the light distribution BR into BR1 facing toward the center and BR2 facing right, by the entrance surfaces 726L and 726R, which are refracting surfaces. Therefore, compared to the case where the multi-prism 726 is not present, the light distribution spreads out to the left and right, and the light also faces toward the center.

[0129] Fig. 39(a) shows the illuminance distribution on a wall surface when light from a luminaire 720 (without a multi-prism 726) is directed at a wall 785, and Fig. 39(b) shows the illuminance distribution on a wall surface when light from a luminaire 720F, in which a multi-prism 726 is attached to a luminaire 720, is directed at a wall 785. It can be seen that while the light from the luminaire 720 is distributed in two directions, the light from the luminaire 720F has been changed to a horizontally elongated light distribution with less drop in light intensity toward the center.

[0130] <Embodiment 15> The lighting device 900 of this embodiment is a spotlight capable of continuously changing the angle between two light distributions.

[0131] Fig. 40 is a cross-sectional view showing the inside of the lamp body 920. Referring to Fig. 40(a), light emitted from a light source center 922C of the light source 922 and heading leftward passes through a left light distribution area 925L of the dual-light distribution Fresnel prism 925 to become a light ray BL heading further leftward. Light emitted from a light source center 922C of the light source 922 and heading rightward passes through a right light distribution area 925R of the dual-light distribution Fresnel prism 925 to become a light ray BR heading further rightward.

[0132] If the direction of the light rays BL and BR is the direction in which the light intensity is strongest, then by changing the distance H between the light source 922, which is part of the rear luminaire 920L, and the two-light-distribution Fresnel prism 925, which is part of the front luminaire 920U, from Ha in the case of Figure 40(a) to Hc in the case of Figure 40(c), the angle θ between the left diagonal light distribution BL and the right diagonal light distribution BR (the angle θ between the two light distributions) can be changed from θa to θc.

[0133] 40(c), even when the distance H is as small as Hc, the aperture of the front of the rear reflecting mirror 924L is made wider so that the light from the light source 922 can use the entire area of ​​the two-beam-distribution Fresnel prism 925. Accordingly, the front reflecting mirror 924U is made cylindrical so as not to interfere with the position of the rear reflecting mirror 924L.

[0134] Figures 41(a) and (b) show the calculation results of light rays when the distance H between light source center 922C and dual light distribution Fresnel prism 925 (aperture D) is changed from long to short. Here, the refractive index of the Fresnel prism is 1.49 (assuming acrylic), the angle between the entrance surface and exit surface is 40 degrees, and the thickness of the Fresnel prism is sufficiently small (it is drawn large in the figure so that the structure can be seen, but the thickness cannot be seen in this figure). As shown in Figure 41, it can be seen that the angle between the two light distributions changes by changing H.

[0135] <Common features of each embodiment> <led> When a COB type LED light source is used as the light source 322, the light distribution of the light emitted from the light source 322 is close to a so-called Lambertian light distribution in which the relative luminous intensity in the θ direction from the optical axis is cos θ.

[0136] The COB type LED light source 322 is a white LED in which a plurality of blue LED chips, each having a light emitting layer made of InGaN, are arranged on a substrate, and the top and side surfaces of the blue LED chips are covered with a phosphor-containing resin.

[0137] The COB type LED light source 322 may be an LED with a fixed light emission color, or may be one in which the light emission area is divided into two areas, with the first area emitting white light with a high color temperature and the second area emitting white light with a low color temperature, and the light emission amount of the first area and the second area being controllable separately.

[0138] Instead of a COB type LED light source, a CSP type LED light source may be used in which a CSP (Chip Scale Package) of a high color temperature white LED with a color temperature of 6500K and a CSP of a low color temperature white LED with a color temperature of 3000K are arranged on a substrate.

[0139] As the LEDs used in the CSP type LED light source, three color LEDs, that is, a bluish white LED (Bw), a red LED (R), and a yellowish white LED (Yw) may be used.

[0140] The blue-white LED (Bw) is an InGaN blue LED chip whose top and sides are covered with a resin containing green phosphor particles or yellow phosphor, and may further contain red phosphor particles.

[0141] The yellow-white LED (Yw) is the same as Bw in that it has an InGaN blue LED chip placed at the bottom of the package, and the top and sides of the InGaN blue LED chip covered with a resin containing green phosphor particles or yellow phosphor, but the phosphor concentration is higher than that of Bw. It may also contain red phosphor particles.

[0142] The red LED (R) is an InGaN blue LED chip whose top and sides are covered with a resin containing red phosphor particles. The red LED (R) may be an AlGaInP LED chip instead of an InGaN blue LED chip, covered with a resin that does not contain phosphor. An LED package using an AlGaInP LED chip as the red LED (R) is preferable because it does not contain blue in the emission spectrum, but the driving voltage is different from that of a bluish-white LED (Bw) or a yellowish-white LED (Yw), so the driving circuit becomes complicated. In the case of an LED package combining a blue LED chip and a red phosphor as the red LED (R), a process to reduce the blue contained in the emission spectrum is required. For example, it is preferable to increase the concentration of the red phosphor to reduce the proportion of light emitted from the blue LED chip to the outside, but a filter that absorbs blue may be used.

[0143] Although the size is larger than that of a CSP type LED, an SMD (Surface Mount Device) type LED may also be used, and is particularly suitable for use as a light source for lighting fixtures with a large diameter.

[0144] In each of the above LEDs, the yellow phosphor particles are, for example, (Y 1-x Gd x ) 3 Al 5 O 12 :Ce 2+ (0≦x≦1), and for green phosphor particles, for example, Lu 3 Al 5 O 12 :Ce 2+ For example, Sr x Ca 1-x AlSiN 3 :EU 3+ (0≦x≦1) Phosphor, Sr[LiAl 3 N 4 ]:EU 2+ Or K 2 SiF 6 :Mn 4+ Phosphors can be preferably used, and quantum dots can also be preferably used.

[0145] <Chromaticity of LED> Figure 25 is a chromaticity diagram (chromaticity coordinate diagram) for explaining the chromaticity of blue-white LED (Bw), red LED (R), and yellow-white LED (Yw). For reference, the line connecting the chromaticity of blackbody radiation at each color temperature is shown as a dotted line. Note that although Yw appears to be a color close to yellow on the chromaticity diagram, it appears to be a color close to green when other Bw and R are lit simultaneously.

[0146] The blue-white LED (Bw) emits light with a chromaticity within the range surrounded by (0.336, 0.24), (0.352, 0.44), (0.15, 0.2), and (0.2, 0.1) in the CIE1931 chromaticity coordinates of Figure 25, and is, for example, (0.23, 0.26).

[0147] The red LED (R) emits light with a chromaticity within the range surrounded by (0.66, 0.23), (0.423, 0.355), (0.5, 0.5), and the chromaticity boundary line E in the chromaticity coordinates of Figure 25, and is, for example, (0.60, 0.38). Note that it is different from the general definition of red.

[0148] The yellow-white LED (Yw) emits light with a chromaticity within the range surrounded by (0.5, 0.5), (0.423, 0.355), (0.342, 0.312), (0.352, 0.44), (0.37, 0.63), and the chromaticity boundary line E in the chromaticity coordinates of Figure 25, and is, for example, (0.44, 0.47).

[0149] Within the chromaticity range of the yellow-white LED (Yw), the range where d from the line connecting the chromaticity of blackbody radiation at each color temperature is positive is preferable, and uv it is particularly preferable that d is from +0.03 to 0. uv it is particularly preferable that d is from +0.03 to 0.

[0150] As for the chromaticity of the blue-white LED (Bw) and the red LED (R), the range where d is from +0.03 to -0.03 from the line connecting the chromaticity of blackbody radiation at each color temperature is particularly preferable. uv it is particularly preferable that d is from +0.03 to -0.03.

[0151] Note that d uv The value of 1000 times is sometimes called Duv (with the first d capitalized).

[0152] It should be noted that it can also be expressed in CIE1976 chromaticity coordinates (u',v') instead of CIE1931 chromaticity coordinates (x,y), and the two can be converted to each other using the conversion formula u'=4x / (-2x+12y+3),v'=9y / (-2x+12y+3). It can also be expressed in other chromaticity coordinate systems.

[0153] <Variations> Although the three-color LEDs described above are red (R), yellow-white (Yw), and blue-white (Bw), other three-color LEDs may be used. For example, R, Yw, and blue (B) (LEDs with chromaticity coordinates of x≦0.2, y≦0.2) may be used, in which case Yw is most preferable as the LED at the end, and R should be avoided. Three-color LEDs of R, green (G) (LEDs with chromaticity coordinates of x≦0.35, y≧0.4), and B may also be used.

[0154] The lighting device is not limited to a ceiling recessed universal downlight or a simple downlight, but may also be a spotlight.

[0155] The lighting device may be a bulb-type LED that can be attached to a bulb base.

[0156] The "two-light-distribution optical element" in the present invention is a concept including "two-light-distribution lens," "two-light-distribution prism," "two-light-distribution Fresnel prism," "two-light-distribution multi-prism," and the like, and is an optical element that emits at least an outgoing light diagonally to the left and an outgoing light diagonally to the right when incident light is incident. Among them, the "two-light-distribution lens," "two-light-distribution prism," and "two-light-distribution Fresnel prism" can be classified as two-region type two-light-distribution optical elements, and the "two-light-distribution multi-prism" can be classified as a region-mixing type two-light-distribution optical element. For lighting devices that change the angle between the two light distributions by changing the distance H, two-region type two-light-distribution optical elements can be particularly suitably used.

[0157] In the present invention, the "two-light-distribution optical element", for example, a "two-light-distribution lens", means a lens that distributes light in at least two directions. Therefore, even a three-light-distribution lens or a four-light-distribution lens having three or four convex lens regions is included in the scope of the present invention. This is not limited to convex lens regions, and the same applies to prism regions. For example, a three-light-distribution optical element that distributes light in three directions, the optical axis direction, the left diagonal direction, and the right diagonal direction with respect to the optical axis, may be used. As an example of the use of a lighting device using such a three-light-distribution optical element, a lighting device that illuminates the left and right walls of a corridor and also ensures illuminance on the floor surface by light in the optical axis direction is considered.

[0158] The virtual outer shape of the light distribution region such as the convex lens region in the present invention is not limited to a circle, and may be, for example, an ellipse or a rectangle. The virtual outer shape may be a rectangle having a cross section of a part of a cylinder in the direction of one side.

[0159] The shape of the reflector that reflects the light emitted from the center of the light source in a direction different from the optical axis direction, as exemplified in FIG. 2 in the present invention, can also be applied to the rear reflector and the front reflector.

[0160] The convex lens function and the dual light distribution function in the dual light distribution lens may be separated and performed by using one convex lens and a dual light distribution prism.The two may also be integrated to use a dual light distribution optical element in which, for example, the entrance surface is a dual light distribution prism and the exit surface is a convex lens.

[0161] In a system that can control the angle between the two light distributions using a motor and a lighting control device, for example, it is possible to perform scheduled operation that changes the angle between the two light distributions according to time. It is also possible to perform sensor-linked operation. As an example of sensor-linked operation, the lighting device of the present invention is used for lighting in a hospital corridor, and the angle between the two light distributions is usually small, but when a bed passes by, the angle between the two light distributions is increased by a motion sensor, thereby reducing the amount of light directly below that is dazzling to a patient lying in bed and looking up.

[0162] By eliminating the two light distribution optical elements in the 12th, 13th, 14th, and 15th embodiments, or by replacing the two light distribution optical elements with one light distribution optical element such as a general convex lens, concave lens, or diffuser plate, the spread of light distribution in one direction (light distribution angle) can be changed, and the basic structure can be understood as "a variable light distribution lighting device that has a rear reflector and a front reflector and can change the spread of light distribution by changing the positions of the light source and the upper end of the front reflector." The distance H in the absence of two light distribution optical elements can be the distance on the optical axis between the surface including the upper end of the front reflector and the light source. As a structural feature, for example, when the distance H is at a minimum value, the rear reflector is inside the front reflector.

[0163] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be a basis for a restrictive interpretation. Therefore, the technical scope of the present invention is not interpreted solely by the above-described embodiments, but is defined based on the claims. Also, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0164] 100, 200, 300, 400, 500, 500V, 700, 900 Lighting equipment 120, 220, 320, 420, 520, 520B, 520V, 720, 920 light body 720U, 920U front light body 720L, 920L rear light body 720E Intermediate light body 122, 322, 422, 522, 722, 922 light source 124, 224, 324 reflector 521, 721 Heatsink 524L, 724L, 924L Rear reflector 524U, 724U, 924U front reflector 125 2-beam distribution prism 225, 925 2-beam Fresnel prism 325, 525, 725 2-beam lens 425 2-beam multi-prism 551 Motor 552 Lead screw shaft 553 Screw holder 370, 570V, 770 Lighting Control Unit 371, 571, 771 Lighting control software< / led>

Claims

1. An illumination device comprising: a light source having a light source center on an optical axis; a bidirectional light distribution optical element having a light incident surface and a light exit surface; and a reflecting mirror that reflects light that is emitted from the center of the light source and does not directly enter a lower surface of the bidirectional light distribution optical element, and causes the light to enter the lower surface of the bidirectional light distribution optical element, The two-way light distribution optical element includes a left light distribution region that outputs light emitted from the light source center to the left of the optical axis only on the left side of the optical axis on at least one of the light incident surface or the light exit surface, and a right light distribution region that outputs light emitted from the light source center to the right of the optical axis only on the right side of the optical axis on at least one of the light incident surface or the light exit surface, a separation distance is provided between the light source and the light incident surface of the two-way light distribution optical element; The two-way light distribution optical element distributes light emitted from the light source so that the light has peaks of luminous intensity in a diagonal left direction and a diagonal right direction from the optical axis, and has an angle between the two peak directions, which is an angle between the two directions; The angle between the two peak directions can be changed by changing the separation distance to a value between a minimum value and a maximum value. Lighting equipment.

2. The angle between the two peak directions can be changed by changing the separation distance to a value between the minimum value and the maximum value without changing the orientation of the two-way light distribution optical element.

2. The lighting device according to claim 1.

3. The lighting device includes a rear reflector that is movable integrally with the light source as the reflector, a height of the rear reflecting mirror, which is a distance from the light source to a virtual plane including a top end of the rear reflecting mirror in the optical axis direction, is equal to or less than the minimum value of the separation distance; 3. The lighting device according to claim 1 or 2.

4. the illumination device includes, as the reflector, a front reflector that is movable integrally with the two-way light distribution optical element, When the separation distance is at the minimum value, the rear reflector is inside the front reflector.

4. The lighting device according to claim 3.

5. A lighting device comprising a light source having a light source center on an optical axis, a reflecting mirror arranged to surround the optical axis, and a two-way light distribution optical element having a light incident surface and a light exit surface, into which light from the light source and the reflecting mirror is incident, the two-way light distribution optical element has a left light distribution region that outputs the light emitted from the light source center to the left of the optical axis, and a right light distribution region that outputs the light emitted from the light source center to the right of the optical axis, The relative positions of the reflecting mirror and the light source are fixed, and the reflecting mirror reflects the light emitted from the center of the light source in a direction outward from the optical axis direction, By combining the two-way light distribution optical element and the reflecting mirror, the light emitted from the light source has a luminous intensity peak in two different directions and is distributed so as to take an angle between the two peak directions, which is the angle between the two directions. Lighting equipment.

6. A lighting device comprising a lamp body and a frame, the lamp body being capable of changing an angle with respect to the frame, The lamp body includes a light source having a light source center on an optical axis, a reflector having a light entrance surface and a light exit surface and arranged to surround the optical axis, and a two-way light distribution optical element into which light from the light source and the reflector is incident, the two-way light distribution optical element has a left light distribution region that outputs the light emitted from the light source center to the left of the optical axis and a right light distribution region that outputs the light emitted from the light source center to the right of the optical axis, The relative positions of the reflecting mirror and the light source are fixed, and the reflecting mirror reflects the light emitted from the center of the light source in a direction outward from the optical axis direction, By combining the two-way light distribution optical element and the reflecting mirror, the light emitted from the light source is distributed so as to have a luminous intensity peak in two different directions and to take an angle between the two peak directions, which is the angle between the two directions; By changing the angle of the light body, it is possible to distribute light in one of the two directions perpendicular to the frame. Lighting equipment.

7. The reflecting mirror reflects the light emitted from the center of the light source outwardly by 5 degrees or more from the optical axis direction.

7. An illumination device according to claim 1, 5 or 6.

8. The illumination device includes an attachment / detachment mechanism that enables the bidirectional light distribution optical element to be replaced with another bidirectional light distribution optical element having a different angle between the two peak directions while the illumination device is installed.

7. An illumination device according to claim 1, 5 or 6.

9. The left light distribution area and the right light distribution area have different light distribution characteristics in the left-right direction and in the direction perpendicular to the optical axis direction.

7. An illumination device according to claim 1, 5 or 6.

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