lighting equipment

Abstract

To achieve both an increase in light volume and narrow angle light distribution performance / light condensing performance in an illumination device using an LED.SOLUTION: An illumination device 300 includes a light source 323 and a lens 324C for condensing the light emitted from the light source 323. The light source 323 is arranged at least in two rows. The lens 324 includes a light incident surface 324CS where the light emitted from the light source 323 is made incident and a light emission surface 324CT1 / 324CT2 where the light incident on the light incident surface is emitted in a cross section orthogonal to the rows of the light source. The lens 324 includes lens axes as many as the rows with the position where an interval between the light incident surface 324CS and the light emission surface 324CT1 / 324CT2 becomes largest as lens axes B1 / B2, and includes total reflection surface 324CR5 / 324CR6 for reflecting the incident light P51 / P61 forward on the outside of a space between a plurality of the lens axes B1 / B2 in the lens 324.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a lighting device in which LEDs are arranged in a row. [Background technology]

[0002] Lighting devices with LEDs arranged in rows have become widely used as a technology to replace fluorescent lamps. Among these lighting devices, those developed with the aim of illuminating a wide area, similar to fluorescent lamps, generally do not use a condensing lens or the like. Meanwhile, Patent Document 1 discloses a linear light source that uses a lens with two convex portions corresponding to two rows of LEDs. Referring to Figure 7 of Patent Document 1, the central axis of the LEDs and the central axis of the convex portions of the condensing lens are aligned.

[0003] In Patent Document 2, referring to FIG. 1, it is stated that by shifting the cylindrical lenses 6 and 9 inward by V1 and V2 with respect to the LED row 3, the focusing of the beam angle is optimized. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-67367 [Patent Document 2] Special Publication No. 2015-523673 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to achieve both an increase in the amount of light and a narrow-angle light distribution and light concentration in a lighting device using an LED. [Means for solving the problem]

[0006] The present invention provides an illumination device including a light source and a lens that condenses light emitted from the light source, The light source isContains the leftmost column of left light sources and the rightmost column of right light sources Arranged in at least two rows, the lens has, in a cross section perpendicular to the row of the light sources, a light incident surface onto which light rays emitted from the light sources are incident as incident light, and a light exit surface from which the incident light exits, the lens has a number of lens axes equal to the number of the rows, with the position where the distance between the light incident surface and the light exit surface is the largest being the lens axis; the distance between the axis of the leftmost lens and the axis of the rightmost lens is wider than the distance between the row of the left light sources and the row of the right light sources; A total reflection surface that reflects the incident light forward is provided on the outer side of the lens between the axes of the plurality of lenses.

[0007] The present invention further provides a method in which the portion from which the light reflected by the total reflection surface exits may be located on a surface that is perpendicular to the axial direction of the lens and closer to the surface including the light source than the position of the light exit surface on the axis of the lens.

[0008] The present invention further provides a method in which the portion of the light incident surface into which the light rays reflected by the total reflection surface are incident may be located on a surface that is perpendicular to the axial direction of the lens and closer to a surface including the light source than the position of the light incident surface on the axis of the lens. [Effects of the Invention]

[0009] According to the present invention, in a lighting device using LEDs, the amount of light can be increased by arranging the LEDs in multiple rows, while at the same time, by varying the distance between the LED rows and the distance between the axes of the convex lenses, it is possible to achieve both narrow-angle light distribution and light concentration. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is an external perspective view of an illumination device according to a first embodiment. [Figure 2] FIG. 2 is a front cross-sectional view of the lighting device according to the first embodiment. [Figure 3] FIG. 2 is a side cross-sectional view of the lighting device according to the first embodiment. [Figure 4]10 is a graph of a simulation in the first embodiment, with the horizontal axis representing LB / LA and the vertical axis representing axial luminous intensity. [Figure 5] 10 is a graph of a simulation in the first embodiment, with LB / LA as a parameter, the horizontal axis representing the 1 / 2 illuminance angle, and the vertical axis representing the axial luminous intensity. [Figure 6] 10 shows the results of a light distribution simulation when LB / LA is 1.1, 1.2, and 1.3 in the first embodiment. [Figure 7] Chromaticity diagrams of the LEDs used in the first embodiment. [Figure 8] FIG. 3 is a front view of the light source unit showing the arrangement of LEDs when three-color LEDs are used in the first embodiment. [Figure 9] FIG. 10 is a side view of the lighting device of the second embodiment when installed on a ceiling. [Figure 10] FIG. 10 is a side cross-sectional view of the lighting device according to the second embodiment. [Figure 11] 10 shows the results of an illuminance simulation of the lighting device of the second embodiment. [Figure 12] FIG. 10 is a side cross-sectional view of the lighting device according to the third embodiment. [Figure 13] 10A and 10B are side cross-sectional views of the lighting device, showing variations in lens mounting. [Figure 14] FIG. 10 is a front view of the light source unit showing the arrangement of LEDs when two-color LEDs are used. [Figure 15] FIG. 10 is a front view of the light source unit showing the arrangement of LEDs when one color LED is used. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Embodiment 1> <Basic configuration> The lighting device 300 according to this embodiment is a lighting device with a separate fixture body and light source unit. As shown in the external perspective view of FIG. 1, the lighting device has a fixture body 310 directly attached to the ceiling, and a light source unit 320 attached to the fixture body 310. Because the fixture body 310 and the light source unit 320 are separable, it is possible to first attach the fixture body 310 to the ceiling, and then hide the screws or hanging bolts used at that time with the light source unit 320. The lighting device 300 has a width of 5 cm, for example, and a length of 120 cm, for example.

[0012] 2 shows a cross-sectional view of the fixture body 310 separated from the light source unit 320. The fixture body 310 is box-shaped with an open bottom, and includes a spring receiver 311 and a connector 312.

[0013] Light source unit 320 includes mounting member 321, substrate 322, LED 323 as a light source, lens 324, cover member 325, power supply 326, wireless module 327, mounting spring 328, and connector 329, as well as cover member end faces (cover member left end face 325L and cover member right end face 325r) (hereinafter, when referring to cover member 325 without specifying, the cover member end faces will not be included). Because the cover member end faces emit light, multiple light source units 320 can be lined up so that the cover member end faces face each other, and the entire multiple light source units 320 can serve as a long, continuous light source.

[0014] As shown in Fig. 1, the lighting device 300 can be controlled by a control device 370. The control device 370 is, for example, a tablet, a smartphone, or a PC, and has lighting control software 371 (not shown) installed thereon. A dimming and color adjustment signal (wireless) is transmitted from the control device 370 by the lighting control software 371 in the control device 370. Referring to Fig. 2, the dimming and color adjustment signal (wireless) is received by a wireless module 327 in the lighting device 300. The wireless module 327 transmits the control signal to a power supply 326, and the power supply 326 supplies drive power controlled by the control signal to the LED 323, which is the light source.

[0015] Lighting control may be performed using the control device 370 when lighting conditions need to be changed, but a schedule can also be set in advance in the lighting control software 371 to automatically control lighting conditions, for example by lowering the brightness and color temperature of the lighting device 300 in the evening.

[0016] <Lens and optical system> 1 is referred to as the front of the light source, the left and right directions are referred to as the sides of the light source, and the parts to the sides of the other parts are referred to as the outer parts. Light directed forward includes light in a direction of plus or minus 45 degrees from the directly downward direction, or light scattered from the cover member front surface part 325M.

[0017] To explain the optical system including the lens 324, a cross section perpendicular to the row direction of the light sources arranged in a row, that is, a cross section of the light source unit 320 viewed from the side in FIG. 2, is shown in FIG. 3. The LED 323-1, which is the light source in the first row, and the LED 323-2, which is the light source in the second row, are spaced apart by a row spacing L, which is the spacing between the optical axes A1 and A2 of the light sources. A The LEDs 323-1 and 323-2 are arranged with a distance (for example, 10 mm) between them, and a lens 324 is arranged below them. The lens 324 is symmetrical with respect to the axis B0, and includes a light incident surface 324S into which light emitted from the light source enters, and light exit surfaces 324T1 and 324T2 from which the light exits. The light incident surface 324S does not have to be flat, but if it is flat, the lens 324 is a combination of two plano-convex lenses in a cross-sectional view. The distance between the light incident surface 324S and the surface of the LED 323-1 (or LED 323-2) is defined as d. d is, for example, 4.4 mm. The axes of the two convex lenses are defined as B1 and B2 at the position where the distance between the light incident surface and the light exit surface of the lens 324 is the largest (in the vertical direction in FIG. 3), and the distance between the axes B1 and B2 (the distance between the lens centers) is defined as L. B The number of axes in the lens is the same as the number of rows of light sources. The width from the axis B0 of the lens 324 to the end of the light emitting surface 324T1 is the lens diameter W, and the height of the lens at the axis B1 is H. The lens diameter W is, for example, 1.46L. AThat is. To increase the axial luminous intensity, a larger lens diameter is better. However, when the lens diameter increases, components directed other than the lens corresponding to the light source increase. Therefore, the lens diameter W is preferably 1.4 times or more and 1.6 times or less of L A is preferred.

[0018] The lens 324 has the same shape in the depth direction of the paper surface of FIG. 3 (the direction of the light source columns, the left - right direction in FIG. 2). Therefore, the lens 324 can also be said be said to be a two - element cylindrical lens (two - element cylindrical lens). However, even when referred to as a "cylinder", it does not mean that the cross - sectional outer shape is strictly circular here, and the cross - sectional outer shape may be an aspherical surface or the like.

[0019] The cover member 325 has a cover member front surface portion 325M, cover member side surfaces 325Y5, 325Y6, and cover member fixing portions 325E5, 325E6 connected to the cover member side surfaces 325Y5, 325Y6. The attachment member 321 has attachment fixing portions 321E5, 321E6 for attaching the substrate 322. The lens 324 is fixed by the cover member fixing portions 325E5, 325E6 and the attachment fixing portions 321E5, 321E6. The cover member 325 may be transparent, but a diffusion material may be dispersed to give it a little light diffusion property. In the following simulation results, the light diffusion property of the cover member 325 is not considered.

[0020] <LED and Light Rays> When using an SMD (Surface Mount Device) type LED package as the LED 323, the light distribution of the light emitted from the LED 323 is close to a so - called Lambertian distribution where the relative luminous intensity in the direction of the angle θ from the optical axis A1 or the optical axis A2 is approximately cosθ. Here, the axis of the LED includes the position of the blue LED chip or the red LED chip described later. When using an LED that includes two or more blue LED chips in the cross - section of FIG. 3, the weighted average position considering the light output of the blue LED chips may be used as the position of the axis.

[0021] As an example of the left - most light ray among the light rays that can be condensed by the lens 324, the LED emission angle θ is 55 degrees to the left from the optical axis.11 The light ray P1 traveling in the direction of the LED to the light incident surface 324S is 11 , ray P in lens 324 12 , a light ray P from the light exit surface 324T1 to the cover member 325 13 , the light ray P outside the cover member 325 14 If the diffusion at the cover member 325 is ignored, the LED emission angle θ 11 is the external emission angle θ 14 The light is emitted forward (including diagonally forward) from the light source unit 320C.

[0022] LED emission angle θ, which is the angle to the right of the optical axis 21 Ray P heading in the direction 21 is the light ray P emitting from the light emitting surface 324T1. 24 and the external emission angle θ 24 is the angle θ 21 is smaller than the ray P 21 is focused by a lens 324.

[0023] LED emission angle θ 11 The same left LED emission angle θ 31 Ray P heading in the direction 31 Considering this, the light is emitted from the light emitting surface 324T2 in a direction different from the optical axis direction of the light source, specifically, at an angle of 1 / 5 of the maximum luminous intensity. 34 <Angle θ 31 However, the LED emission angle is θ 21 more than θ 31 The external emission angles of the following light rays depend on the location on the light emission surface 324T2 through which the light rays pass, and therefore may or may not be focused.

[0024] <Light distribution simulation> The inventors first focused on the light utilization efficiency and calculated the available LED emission angle θ 11 Considering the need to increase the LED emission angle θ 11 is set to 55°, and the LED emission angle θ 11 As a way to widen the lens center distance LB Here, we decided to simulate the light distribution, such as axial luminous intensity and 1 / 2 illuminance angle, knowing that widening the center spacing of the lenses would increase the influence of light passing through a different lens row than the light source row, and that there was a high possibility that only poor results would be obtained.

[0025] In Fig. 4, the horizontal axis is the lens center distance L B Column spacing L A The ratio to L B / L A The graph shows a simulation in which the vertical axis represents the axial luminous intensity. However, the axial luminous intensity is in cd when the luminous flux of the light source is assumed to be 1000 lm. B / L A It was found that the axial luminosity becomes high when is between 1.05 and 1.21.

[0026] Figure 5 shows the L B / L A This is a graph of a simulation with the parameter, the horizontal axis being the 1 / 2 illuminance angle, which is an index of light concentration, and the vertical axis being the axial luminous intensity (cd when the light source luminous flux is 1000 lm). The values ​​written in the graph are the L of each store. B / L A Even if we consider the 1 / 2 illumination angle, L B / L A It was found that when the value is between 1.05 and 1.21, especially when it is 1.1 or 1.2, the half-illumination angle is high and the axial luminous intensity is high.

[0027] Figure 6(a), (b), and (c) show the L B / L A The results of the light distribution simulation when L is 1.1, 1.2, and 1.3 are shown in a polar coordinate system (when the cover member 325 is transparent). The scale of the axis representing the beam intensity is different in Figures 6(a), (b), and (c). A When L is 1.1, 1.2, and 1.3, the 1 / 2 illumination angle is 12°, 14°, and 39°, respectively. A When L is 1.1, 1.2, or 1.3, a narrow angle light distribution is achieved. B / L AWhen it is 1.3, the light distribution is divided into two, and it can be seen that it is not suitable for the purpose of "condensing light".

[0028] In order to reduce color unevenness and light distribution unevenness, by giving the cover member 325 diffusibility, a lighting fixture with a half-illuminance angle of, for example, 25° to 50° can be realized.

[0029] <Structure and Color of LED> The LED 323 used in Embodiment 1 is a package in which a blue LED chip whose light-emitting layer is made of InGaN is mounted on the bottom surface of an SMD package having a concave portion, and the concave portion of the package is sealed with a phosphor-containing sealing resin so that the upper surface and side surfaces of the blue LED chip are covered with the phosphor-containing resin. The width of the LED is about 3 mm.

[0030] As the LED 323, three-color LEDs 323Bw, 323R, and 323Yw are used. In FIG. 3, reference numerals LED323-1 and LED323-2 are used, but these are for distinguishing the rows of LEDs and are a concept different from the color of the LEDs.

[0031] The LED 323Bw uses green-based phosphor particles or yellow-based phosphor as the phosphor. Further, it may contain red-based phosphor particles.

[0032] The LED 323Yw uses green-based phosphor particles or yellow-based phosphor as the phosphor. Further, it may contain red-based phosphor particles. Generally, the concentration of the phosphor is higher than that of Bw.

[0033] LED323R uses an InGaN-based blue LED chip and red phosphor particles as the phosphor. Note that as LED323R, instead of an InGaN-based blue LED chip, a red LED chip, for example, an AlGaInP-based LED chip, may be used and covered with a resin without phosphor. If an LED using an AlGaInP-based LED chip is used as LED323R, it is preferable in that the emission spectrum does not contain blue, but since the driving voltages of Bw and Yw are different, the driving circuit becomes complicated. In the case of an LED combining a blue LED chip and a red phosphor as LED323R, as a process for reducing the blue contained in the emission spectrum, for example, it is preferable to increase the concentration of the red phosphor to reduce the ratio of the light from the blue LED chip radiated to the outside, or to use a filter that absorbs blue.

[0034] In each of the above SMD type LEDs, as the yellow phosphor particles, for example, (Y 1-x Gd x )3Al5O 12 :Ce 2+ (0≦x≦1), as the green phosphor particles, for example, Lu3Al5O 12 :Ce 2+ , as the red phosphor, for example, Sr x Ca 1-x AlSiN3:Eu 3+ (0≦x≦1) phosphor, Sr[LiAl3N4]:Eu 2+ or K2SiF6:Mn 4+ phosphor can be preferably used. Quantum dots can also be preferably used.

[0035] <LED Chromaticity> The LED323Bw used in this embodiment is called a blue-white LED, LED323R is called a red LED, and LED323Yw is called a yellow-white LED. Note that although Yw is a color close to yellow on the chromaticity diagram, when other Bw and R are lit simultaneously, it also appears to be a color close to green. FIG. 7 is a chromaticity diagram (chromaticity coordinate diagram) for explaining the chromaticity of these LEDs, and the line connecting the chromaticities of blackbody radiation at each color temperature is shown as a dotted line for reference.

[0036] The bluish-white LED LED323Bw emits light with a chromaticity in the range enclosed by (0.336, 0.24), (0.352, 0.44), (0.15, 0.2), and (0.2, 0.1) in the CIE 1931 chromaticity coordinates of FIG. 7, and one example is (0.23, 0.26).

[0037] The red LED LED323R emits light with a chromaticity in the range enclosed by chromaticity boundary line E, i.e., (0.66, 0.23), (0.423, 0.355), and (0.5, 0.5) in the chromaticity coordinates of Figure 7, and an example is (0.60, 0.38). Note that this is not the same as the general definition of red.

[0038] The yellow-white LED LED323Yw emits light with a chromaticity in 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 chromaticity boundary line E in the chromaticity coordinates of Figure 7, and one example is (0.44, 0.47).

[0039] Within the chromaticity range of Yw, the distance d from the line connecting the chromaticity of blackbody radiation at each color temperature uv is preferably in the positive range, and d uv is particularly preferably from plus 0.03 to 0.

[0040] Within the chromaticity range of Bw and R, the distance from the line connecting the chromaticity of blackbody radiation at each color temperature is d uv is particularly preferably in the range of plus 0.03 to minus 0.03.

[0041] In addition, d uv The value of 1000 times is sometimes called Duv (with the first d capitalized).

[0042] It should be noted that the chromaticity coordinates (u',v') of CIE1976 can be used instead of the chromaticity coordinates (x,y) of CIE1931, and the two can be converted to each other using the formula u'=4x / (-2x+12y+3), v'=9y / (-2x+12y+3). It is also possible to display in other chromaticity coordinate systems.

[0043] <LED Array> FIG. 8(a) is a front view of a light source unit showing the arrangement of LEDs when using three-color LEDs in Embodiment 1, that is, a diagram for explaining the LED array when viewing the light source unit 320 in FIG. 2 from below, and descriptions of unnecessary parts for explanation are omitted.

[0044] The LEDs in the first column are designated as LED323-1, and the LEDs in the second column are designated as LED323-2. These are mounted on the substrate 322. A lens 324 is installed on the upper side of the substrate (the lower side of the substrate in the installation state of FIG. 2). The axes B1 and B2 of the lens 324 are slightly deviated from the positions of the LEDs 323 as described above. The cover member 325 covers the lens 324. The left end face 325L and the right end face 325r of the cover member extend from the cover member 325 side in the direction of the substrate.

[0045] Three-color LEDs are used as the LEDs, and the LEDs 323Bw, LED323R, and LED323Yw are brought close to form groups of LEDs such as LED323-1 (G1), LED323-2 (G1), etc. By bringing LEDs of different colors close in this way, color unevenness can be reduced. However, since it is disadvantageous in terms of heat dissipation, if the color unevenness is not large, the arrangement intervals of the LEDs may be the same.

[0046] Furthermore, in order to reduce color unevenness at the end faces, different types of LEDs are arranged at the left end of the first column as LED323Bw and at the left end of the second column as LED323Yw to average the colors. Also, by not bringing the LED323R, which is a conspicuous color, near the left end face 325L of the cover member, it is possible to prevent the left end face 325L of the cover member from glowing red.

[0047] This LED array is common in other embodiments. The cases of using two-color LEDs and one-color LEDs will be described separately.

[0048] Fig. 8(b) shows the lens 324 in Fig. 8(a) as seen from the front side in Fig. 2. The lens 324 has the same cross-sectional shape in the depth direction (the left-right direction in Fig. 8(b)), and has a constant height H.

[0049] Fig. 8(c) shows lens 324G, which is a variation of lens 324. Protrusions 324G1 and 324G2 are provided corresponding to positions G1 and G2 of group LEDs 323-1(G1 and 323-1(G2) on the LED side, respectively, to provide light collection in the left-right direction in Fig. 8(c).

[0050] In FIG. 8(c), the lens 324G is not separated in the left-right direction, but the convex portions 324G1 and 324G2 may be separated.

[0051] <Embodiment 2> In the second embodiment, the lens 324 in the first embodiment is replaced with a lens 324B, and the other components are the same as those used in the first embodiment. Accordingly, the light source unit 320 is replaced with a light source unit 320B, and the lighting device 300 is replaced with a lighting device 300B, but the names and symbols of the other components are the same as those used in the first embodiment. The basic design of the third embodiment is as follows: B / L A = 1.1, etc., which are the same as in embodiment 1, but compared to embodiment 1, the lens height H is increased, the distance d between the LED and the lens is reduced, and further the light incident surfaces 324BS1 and 324BS2 on the lens side of the LED are made concave, thereby increasing the amount of light that is condensed.

[0052] <Installation status> 9 is a side view of the lighting device 300B when it is installed in a recessed hole in a ceiling 390. The recessed hole is made up of a recessed side surface 394 and a recessed bottom surface 395. The fixture body 310 of the lighting device 300B (the same as that used in the first embodiment) is installed on the recessed bottom surface 395, and the light source unit 320B is attached. As a result, the side surface of the light source unit 320B is covered by the recessed side surface 394.

[0053] <LED and Light Rays> To describe the optical system including the lens 324B, Fig. 10 shows a cross-sectional view of the light source unit 320 when viewed from a cross-section perpendicular to the column direction of the light sources arranged in a column.

[0054] Among the light rays that can be condensed by the lens 324B, as an example, the LED emission angle θ at an angle of 80 degrees to the left from the optical axis 11 the light ray P traveling in the direction, that is, the light ray P from the LED to the light incident surface 324BS1 11 in the lens 324B 12 the light ray P from the light exit surface 324BT1 to the cover member 325 13 the light ray P outside the cover member 325 14 is considered. Ignoring the diffusion at the cover member 325, the LED emission angle θ 11 becomes the more condensed external emission angle θ 14 .

[0055] The light ray P traveling in the direction of the LED emission angle θ to the right from the optical axis 21 becomes the light ray P exiting from the light exit surface 324BT1 21 and its external emission angle θ 24 is smaller than the LED emission angle θ 24 . That is, the light ray P 21 is condensed by the lens 324B. 21

[0056] Considering the light ray P traveling in the direction of the LED emission angle θ at an angle of 80 degrees to the right from the optical axis 31 it becomes a light ray emitted in an unexpected direction because it exits from the light exit surface 324BT2. In the illustration, it happens that the angle θ 31 <angle θ 34 but when the LED emission angle is θ 31 and above θ 21 and below θ 31 the external emission angle of the light ray depends on the location where the light ray passes through the light exit surface 324T2, so it may or may not be condensed. In Fig. 9 showing the installation state, the embedded side surface 394 is provided near the side surface of the cover member because of the light ray P exiting from the side surface of the cover member 31This is to block out the

[0057] The lens 324B has support protrusions 324BE5, 324BE5, which are fixed by cover member fixing portions 325E5, 325E6 and mounting fixing portions 321E5, 321E6.

[0058] <Illuminance simulation results> FIG. 11 shows the results of an illuminance simulation in the second embodiment, where the total luminous flux of the light source is 1000 lm. The vertical axis represents the distance from the light source, and the horizontal axis represents the distance from directly below the light source. The illuminance at 1 m directly below the light source is 1480 lx, 370 lx at 2 m, 160 lx at 3 m, and 92 lx at 4 m. The positions of illuminances of 1000, 200, 500, and 1000 lx are also shown. The 1 / 2 illuminance angle is 14 degrees, and light collection is achieved. The part marked with a star in the figure indicates, for example, the light ray P 31 This is caused by leaked light consisting of components such as those mentioned above, which can cause unwanted glare, etc. In an example of using this lighting fixture, the side surface of light source unit 320 is covered by recessed side surface 394 as shown in Figure 9, in order to deal with this leaked light.

[0059] As a measure against light leakage, the light may be scattered by increasing the diffusion property of the side surface 325Y6 while being directly attached to the ceiling as in the first embodiment.

[0060] In embodiment 2, L B / L A The dependency is basically the same as in the first embodiment, but the angle range of available light rays has been widened, resulting in an increase in the overall amount of light.

[0061] <Embodiment 3> In the third embodiment, the lens 324 in the first embodiment is replaced with a lens 324C, and the other components are the same as those used in the first embodiment. Accordingly, the light source unit 320 is replaced with a light source unit 320C, and the lighting device 300 is replaced with a lighting device 300C. However, the names and symbols of the other components are the same as those used in the first embodiment. The basic design of the third embodiment is the same as that of the first embodiment. B / L A= 1.1 etc., which is the same as in Embodiment 1.

[0062] <LED and Light Ray> In Embodiment 3, the light ray P traveling in the direction of angle θ5 from the LED 323-1 51 , and the light ray P traveling in the direction of angle θ6 from the LED 323-2 61 can also be extracted forward by utilizing total internal reflection in the portion provided on the side of the lens.

[0063] To explain the optical system including the lens 324B, Fig. 12 shows a cross-sectional view when viewing the light source unit 320 from a cross-section orthogonal to the column direction of the light sources arranged in a column.

[0064] The light ray P 51 enters the lens 324 from the light incident surface 324CS5 and travels as the light ray P 521 , is totally reflected by the total reflection surface 324CR5 provided on the left outside of the light emitting surface 324CT1 of the convex portion in the lens 324 and travels as the light ray P 522 , exits from the light emitting surface 324CT5 as the light ray P 53 , and exits from the cover member 325 as the light ray P 54 .

[0065] The light ray P 61 enters the lens 324 from the light incident surface 324CS6 and travels as the light ray P 621 , is totally reflected by the total reflection surface 324CR6 and travels as the light ray P 622 , exits from the light emitting surface 324CT6 as the light ray P 63 , and exits from the cover member 325 as the light ray P 64 .

[0066] The lens 324C includes support protrusions 324CE5 and 324CE5, and they are fixed by the cover member fixing portions 325E5 and 325E6, and the mounting fixing portions 321E5 and 321E6.

[0067] The L B / L A dependency trend basically remains unchanged, but for the light ray P 51, P 52 The availability of light sources has resulted in an overall increase in light output.

[0068] <Variations> As a method for attaching the lens 324, etc., the lens 324, etc. may be attached to the attachment member 321. For example, as shown in Fig. 13, in a light source unit 320N, lens attachment members 321NF5 and 321NF6 may be provided in addition to attachment and fixing portions 321NE5 and 321NE6 of an attachment member 321N, and lens attachment members 324NF5 and 324NF6 that fit with these portions may be provided on a lens 324N, and the lens 324N may be attached.

[0069] Two-color LEDs or one-color LEDs may be used as the LEDs 323. When the two-color LEDs are LEDs 323Wc, which are high color temperature LEDs (for example, a color temperature of 6500 K), and LEDs 323Ww, which are low color temperature LEDs (for example, a color temperature of 2700 K), the front view of the light source unit showing the arrangement of the LEDs may be as shown in, for example, Fig. 14. When the one-color LEDs are white LEDs 323W (for example, a color temperature of 4000 K), the arrangement of the LEDs may be as shown in, for example, Fig. 15.

[0070] The LED 323 may be an LED of three colors, R (red), G (green), and B (blue), or an LED of four colors, R, G, B, and W (white).

[0071] The number of LED rows is not limited to two, and an additional row may be provided between the two rows. A is the spacing between the most distant columns, L B is the distance between the axes of the lenses corresponding to the farthest rows. The number of rows of LEDs should be between two and four, preferably three or less.

[0072] Although the lens 324 etc. has been described as two combined convex lenses, it may be two independent lenses (or the number of LED rows).

[0073] The cross-sectional shape of the lens 324 etc. may be the same in the depth direction of Figure 13, but may have convex portions corresponding to two groups such as LED323-1 (G1) in Figure 14, or may have convex portions corresponding to each LED323-1 in Figure 15.

[0074] It should be noted that the above-described embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention should not be interpreted solely by the above-described embodiments, but should be defined by the claims. Furthermore, all modifications within the scope and meaning equivalent to the claims are included. [Explanation of symbols]

[0075] 300, 300B, 300C lighting equipment 310 Equipment body 312 Connector 320, 320B, 320C, 320N Light Source Unit 321, 321N mounting parts 321E5, 321E6 mounting fixing part 321NE5, 321NE6 mounting fixing part 321NF5, 321NF6, 324NF5, 324NF6 Lens mounting bracket 322 Substrate 324, 324B, 324C, 324G, 324N lenses 324BE5, 324BE5, 324CE5, 324CE5 Support protrusion 324BS1, 324BS1, 324BS2, 324CS5, 324CS6, 324S Light entrance surface 324BT1, 324BT2, 324CT1, 324CT5, 324CT6, 324T1, 324T2 Light exit surface 324CR5, 324CR6 total reflection surface 324G1, 324G2 convex part 325 Cover material 325E5, 325E6 Cover member fixing part 325L Left end face of cover 325M Cover front part 325Y5, 325Y6 Cover part side 325r Right end face of cover part 326 Power supply 327 Wireless Module 328 Mounting spring 329 Connector 370 Control Device 371 Lighting Control Software 390 Ceiling 394 Recessed Side 395 Recessed bottom

Claims

1. An illumination device comprising a light source and a lens that condenses light emitted from the light source, the light sources are arranged in at least two rows, including a row of left light sources located on the leftmost side and a row of right light sources located on the rightmost side; the lens has, in a cross section perpendicular to the row of the light sources, a light incident surface onto which light rays emitted from the light sources are incident as incident light, and a light exit surface from which the incident light exits, the lens has a number of lens axes equal to the number of the rows, with the position where the distance between the light incident surface and the light exit surface is the largest being the lens axis; the distance between the axis of the leftmost lens and the axis of the rightmost lens is wider than the distance between the row of the left light sources and the row of the right light sources; a total reflection surface that reflects the incident light forward is provided on the outside of the lens between the axes of the plurality of lenses; Lighting equipment.

2. a portion of the light exit surface from which the light beam reflected by the total reflection surface exits is provided on a surface that is perpendicular to the axial direction of the lens and closer to a surface including the light source than a position of the light exit surface on the axis of the lens; The lighting device according to claim 1 .

3. a portion of the light incident surface onto which the light ray reflected by the total reflection surface is incident is provided on a surface that is perpendicular to the axial direction of the lens and closer to a surface including the light source than the position of the light incident surface on the axis of the lens; The lighting device according to claim 1 .

Images