JP7554792B2 - Lighting equipment - Google Patents

Description

The present invention relates to a lighting device in which LEDs are arranged in a row.

Lighting devices with LEDs arranged in rows have become widely used as a technology to replace fluorescent lamps. Among such lighting devices, those that have been developed with the aim of illuminating a wide area like fluorescent lamps generally do not use a condensing lens or the like. On the other hand, 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 LED and the central axis of the convex portion of the condensing lens are aligned.

In Patent Document 2, referring to FIG. 1, it is said that the beam angle focusing is optimized by shifting the cylindrical lenses 6 and 9 inward by V1 and V2 relative to the LED row 3.

JP 2010-67367 A Special Publication No. 2015-523673

The objective 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 that uses LEDs.

The present invention provides an illumination device comprising a light source and a lens that collects light emitted from the light source, the light sources being arranged in two or more rows, the lens having a light entrance surface into which light emitted from the light source is incident as incident light and a light exit surface from which the incident light is exited, in a cross section perpendicular to the rows, the lens having a position where the distance between the light entrance surface and the light exit surface is greatest as the lens axis, the number of lens axes being the same as the number of rows, the distance between the rows of the light sources being L _A and the distance between the lens axes being L _B , and L _B /L _A being 1.05 or greater and 1.21 or less.

In the present invention, the lens may be provided with a total reflection surface on the outside between the axes of the plurality of lenses , the total reflection surface reflecting the incident light forward.

In the present invention, the device may include a substrate on which the light source is mounted and a mounting member for fixing the substrate, and the lens may be fixed to the mounting member.

The present invention may further include a cover member that covers the front and sides of the light source, and the lens may be further supported by the cover member.

In the present invention, the light exit surface may further have a uniform cross-sectional shape in the row direction .

In the present invention, the light exit surface may further have a convex portion corresponding to the light source or the group of light sources in the row direction.

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 achieving both narrow-angle light distribution and light concentration by varying the distance between the LED rows and the distance between the axes of the convex lenses.

FIG. 1 is an external perspective view of a lighting device according to a first embodiment. FIG. 2 is a front cross-sectional view of the lighting device according to the first embodiment. FIG. 2 is a side cross-sectional view of the lighting device according to the first embodiment. 4 is a graph showing a simulation in which the horizontal axis represents L _B /L _A and the vertical axis represents axial luminous intensity in the first embodiment. 11 is a graph of a simulation in which L _B /L _A is a parameter, the horizontal axis represents the ½ illuminance angle, and the vertical axis represents the axial luminous intensity in the first embodiment. 13 shows light distribution simulation results when L _B /L _A is 1.1, 1.2, and 1.3 in the first embodiment. 3 is a chromaticity diagram of each LED used in the first embodiment. FIG. 4 is a front view of the light source unit showing the arrangement of LEDs when three-color LEDs are used in the first embodiment. FIG. 11 is a side view of the lighting device of the second embodiment when installed on a ceiling. FIG. 11 is a side cross-sectional view of a lighting device according to a second embodiment. 13 shows a result of illuminance simulation of the lighting device according to the second embodiment. FIG. 11 is a side cross-sectional view of the lighting device according to the third embodiment. 11A to 11C are side cross-sectional views of a lighting device, showing variations in lens mounting. FIG. 13 is a front view of the light source unit, showing the arrangement of LEDs when two-color LEDs are used. FIG. 13 is a front view of the light source unit, showing the arrangement of LEDs when LEDs of one color are used.

<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 Fig. 1, which is an external perspective view, the fixture body 310 is directly attached to the ceiling, and the light source unit 320 is attached to the fixture body 310. Since the fixture body 310 and the light source unit 320 are separable, the fixture body 310 can be attached to the ceiling first, and the screws or hanging bolts used at that time can be hidden by the light source unit 320. The width of the lighting device 300 is, for example, 5 cm, and the length is, for example, 120 cm.

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

The light source unit 320 includes an attachment member 321, a substrate 322, an LED 323 as a light source, a lens 324, a cover member 325, a power source 326, a wireless module 327, an attachment spring 328, and a connector 329, and also includes end faces of the cover member (left end face 325L of the cover member and right end face 325r of the cover member) (hereinafter, when the cover member 325 is referred to without any specification, the end faces of the cover member are not included). Since the end faces of the cover member are illuminated, the multiple light source units 320 can be arranged so that the end faces of the cover members face each other, and the multiple light source units 320 as a whole can be a long, continuous light source.

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. 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 a control signal to the power source 326, and the power source 326 supplies driving power controlled by the control signal to the LED 323, which is a light source.

Lighting control can 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 perform automatic control, for example, lowering the brightness and color temperature of the lighting device 300 in the evening.

<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 ±45° with respect to the directly downward direction, or light scattered from the cover member front surface part 325M.

In order 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 of the first row, and the LED 323-2, which is the light source of the second row, are arranged at a row interval L _A (for example, 10 mm) between the optical axes A ₁ and A ₂ of the light sources, and the lens 324 is arranged below them. The lens 324 is symmetrical with respect to the axis B ₀ , and includes a light entrance 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 entrance 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 entrance surface 324S and the surface of the LED 323-1 (or LED 323-2) is d. d is, for example, 4.4 mm. The axes of the two convex lenses are axis _B1 and axis _B2 at the position where the distance between the light entrance surface and the light exit surface of the lens 324 is the largest (however, in the vertical direction in FIG. 3), and the distance between the axis _B1 and axis _B2 (lens center distance) is L _B (for example, 11 mm). The number of axes in the lens is the same as the row of light sources. The width from the axis _B0 of the lens 324 to the end of the light exit 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, 1.46 L _A. In order to increase the axial luminous intensity, it is better for the lens diameter to be wider, but as the lens diameter increases, the components directed toward other than the lens corresponding to the light source increase, so the lens diameter W is preferably 1.4 times or more and 1.6 times or less than L _A.

Lens 324 has the same shape in the depth direction of the paper in FIG. 3 (the row direction of the light sources, the left-right direction in FIG. 2). Therefore, lens 324 can also be called a double cylindrical lens. However, even though it is called "cylinder", it does not mean that the cross-sectional outer shape is strictly circular, and the cross-sectional outer shape may be aspherical, etc.

The cover member 325 has a cover member front portion 325M, cover member side surfaces 325Y5 and 325Y6, and cover member fixing portions 325E5 and 325E6 connected to the cover member side surfaces 325Y5 and 325Y6. The mounting member 321 has mounting fixing portions 321E5 and 321E6 for mounting the substrate 322. The lens 324 is fixed by the cover member fixing portions 325E5 and 325E6 and the mounting fixing portions 321E5 and 321E6. The cover member 325 may be transparent, but may have some light diffusivity by dispersing a diffusing material. The following simulation results do not take into account the light diffusivity of the cover member 325.

<LED and light>
When an SMD (Surface Mount Device) type LED package is used as the LED 323, the light distribution of the light emitted from the LED 323 is close to a so-called Lambertian light distribution, in which the relative luminous intensity in the direction of angle θ from the optical axis _A1 or the optical axis _A2 is approximately cos θ. Here, the axis of the LED includes the position of a blue LED chip or a red LED chip, which will be described later. When an LED including two or more blue LED chips is used in the cross section of FIG. 3, the weighted average position taking into account the light output of the blue LED chips may be set as the axis position.

As an example of the leftmost ray of light that can be collected by lens 324, consider ray _P1 directed in the direction of LED emission angle _θ11 , which is an angle of 55 degrees to the left from the optical axis, that is, ray _P11 from the LED to light incident surface 324S, ray _P12 inside lens 324, ray _P13 from light emission surface 324T1 to cover member 325, and ray _P14 outside cover member 325. If diffusion at cover member 325 is ignored, LED emission angle _θ11 becomes a collected external emission angle _θ14 , and is emitted forward (including diagonally forward) from light source unit 320C.

A light ray _P21 traveling in the direction of the LED emission angle _θ21 , which is an angle to the right from the optical _axis , becomes a light ray _P24 that exits the light exit surface 324T1, and the external emission angle _θ24 is smaller than the angle _θ21 .

Considering a light ray _P31 heading in the direction of the left LED emission angle _{θ31 ,} which is the same as the LED emission angle θ11, since it is emitted from the light emission surface 324T2, it becomes a light ray that is emitted in a direction different from the optical axis direction of the light source, specifically, at a beam angle of 1/5 of the maximum luminous intensity. In the figure, the angle _θ34 happens to be smaller than the angle _θ31 , but the external emission angle of a light ray with an LED emission angle between _θ21 and _θ31 depends on the place on the light emission surface 324T2 where the light ray passes, and therefore may or may not be focused.

<Light distribution simulation>
The inventors first focused on the light utilization efficiency and considered increasing the available LED emission angle θ ₁₁ , setting the LED emission angle θ ₁₁ in Fig. 3 to 55°, and considered increasing the lens center interval L _B as a method for increasing the LED emission angle θ _11. Here, knowing that there is a high possibility that only poor results will be obtained if the lens center interval is increased, since the influence of light passing through a lens row different from the row of light sources increases, the inventors decided to perform a simulation of light distribution such as axial luminous intensity and 1/2 illuminance angle.

4 is a graph of a simulation in which the horizontal axis is L _B /L _A , which is the ratio of the lens center distance L _B to the row distance L _A , and the vertical axis is axial luminous intensity. Note that the axial luminous intensity is in cd assuming that the luminous flux of the light source is 1000 lm. Thus, it was found that the axial luminous intensity becomes high when L _B /L _A is 1.05 or more and 1.21 or less.

Fig. 5 is a graph of a simulation in which L _B /L _A is a parameter, the horizontal axis is the 1/2 illuminance angle, which is an index of light collection, and the vertical axis is the axial luminous intensity (cd when the light source luminous flux is 1000 lm). The values written in the graph are the L _B /L _A of each store. Even when the 1/2 illuminance angle is taken into consideration, it was found that when L _B /L _A is between 1.05 and 1.21, and especially when it is 1.1 or 1.2, the 1/2 illuminance angle is high and the axial luminous intensity is high.

6(a), (b), and (c) show the light distribution simulation results in the case where L _B /L _A is 1.1, 1.2, and 1.3, respectively, in a polar coordinate system (when the cover member 325 is transparent). The scale of the axis representing the beam intensity is different in FIG. 6(a), (b), and (c). When L _A is 1.1, 1.2, and 1.3, the 1/2 illuminance angle is 12°, 14°, and 39°, respectively, and when L _A is 1.1, 1.2, and 1.3, a narrow-angle light distribution is realized. On the other hand, when L _B /L _A is 1.3, the light distribution is divided into two, and it can be seen that this is not suitable for the purpose of "light concentration."

In order to reduce uneven color and light distribution, the cover member 325 can be made diffusive, resulting in a lighting fixture with a 1/2 illuminance angle of, for example, 25° to 50°.

<LED structure and color>
The LED 323 used in the first embodiment is a blue LED chip with an InGaN light-emitting layer mounted on the bottom surface of an SMD-type package having a recess, and the recess of the package is sealed with sealing resin containing phosphor so that the top and side surfaces of the blue LED chip are covered with the phosphor-containing resin. The width of the LED is about 3 mm.

LED323 uses three colors: LED323Bw, LED323R, and LED323Yw. Note that in Figure 3, the reference characters LED323-1 and LED323-2 are used to distinguish the LED rows, and are a different concept from the color of the LEDs.

LED323Bw uses green phosphor particles or yellow phosphor as the phosphor. It may also contain red phosphor particles.

LED323Yw uses green phosphor particles or yellow phosphor as the phosphor. It may also contain red phosphor particles. In general, the phosphor concentration is higher than Bw.

LED323R uses an InGaN-based blue LED chip and red phosphor particles as the phosphor. Note that LED323R may use a red LED chip, such as an AlGaInP-based LED chip, instead of an InGaN-based blue LED chip, and cover it with a resin that does not contain phosphor. LED323R using an AlGaInP-based LED chip is preferable because it does not contain blue in the emission spectrum, but the driving voltage is different from Bw and Yw, so the driving circuit becomes complicated. In the case of LED323R combining a blue LED chip and a red phosphor, it is preferable to reduce the blue contained in the emission spectrum by, for example, increasing the concentration of the red phosphor to reduce the proportion of light emitted from the blue LED chip to the outside, or by using a filter that absorbs blue.

In each of the above SMD type LEDs, for example, (Y1 _{- xGdx} ) _3Al5O12 :Ce2 ⁺ (0 _{≦ x≦1) can be used as the yellow phosphor particles, for example, Lu3Al5O12 :} Ce2 ⁺ can be used as the green phosphor particles, and for example _{, SrxCa1 - xAlSiN3} :Eu3 ⁺ (0≦ _x ≦ ₁ ) phosphor, Sr[ _LiAl3N4 ]: _Eu2 ^+, or _K2SiF6 :Mn4 ⁺ phosphor can be used as the red phosphor. Quantum dots can also be used.

<LED chromaticity>
The LED 323Bw used in this embodiment is called a bluish white LED, the LED 323R is called a red LED, and the LED 323Yw is called a yellowish white LED. Note that Yw is a color close to yellow on the chromaticity diagram, but when the other LEDs Bw and R are turned on at the same time, it also appears to be a color close to green. Figure 7 is a chromaticity diagram (chromaticity coordinate diagram) for explaining the chromaticity of these LEDs, and for reference, the line connecting the chromaticity of blackbody radiation at each color temperature is shown with a dotted line.

The blue-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 Figure 7, and one example is (0.23, 0.26).

The red LED LED323R emits light with a chromaticity in the range surrounded by the 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 is (0.60, 0.38) as an example. Please note that this is not the same as the general definition of red.

The yellow-white LED LED 323Yw emits light with a chromaticity in the range surrounded by the chromaticity coordinates of (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 FIG. 7 , and is, for example, (0.44, 0.47).

Within the chromaticity range of Yw, a range in which d _uv is in a positive range from a line connecting the chromaticities of blackbody radiation at each color temperature is preferable, and a range in which d _uv is in a positive range from +0.03 to 0 is particularly preferable.

Within the chromaticity range of Bw and R, it is particularly preferable that d _uv is within the range of +0.03 to -0.03 from the line connecting the chromaticities of blackbody radiation at each color temperature.

In addition, 1000 times the value of d _uv is sometimes called Duv (with the first d capitalized).

Note that it can also be displayed using CIE1976 chromaticity coordinates (u', v') instead of CIE1931 chromaticity coordinates (x, y), and the two can be converted to each other using the conversion formulas u' = 4x/(-2x + 12y + 3), v' = 9y/(-2x + 12y + 3). It may also be displayed using other chromaticity coordinate systems.

<LED arrangement>
Figure 8 (a) is a front view of the light source unit showing the arrangement of LEDs when three-color LEDs are used in embodiment 1, i.e., a diagram explaining the LED arrangement when light source unit 320 in Figure 2 is viewed from below, with parts unnecessary for the explanation being omitted.

The LEDs in the first row are LEDs 323-1, and the LEDs in the second row are LEDs 323-2. These are mounted on a board 322. A lens 324 is installed on the upper side of the board (the lower side of the board in the installed state in FIG. 2). As described above, the axes _B1 and _B2 of the lens 324 are slightly offset from the positions of the LEDs 323. A cover member 325 covers the top of the lens 324. A left end surface 325L and a right end surface 325r of the cover member extend from the cover member 325 side toward the board.

Three color LEDs are used, with LED323Bw, LED323R, and LED323Yw being placed close to each other to form LED groups LED323-1 (G1), LED323-2 (G1), etc. By placing LEDs of different colors close to each other in this way, color unevenness can be reduced. However, this is disadvantageous in terms of heat dissipation, so if the color unevenness is not large, the LEDs may be arranged at the same intervals.

Furthermore, to reduce color unevenness on the end faces, different types of LEDs are placed at the left end of the first row, LED 323Bw, and at the left end of the second row, LED 323Yw, to average out the colors. Also, by not placing LED 323R, which has a conspicuous color, near the left end face 325L of the cover member, the left end face 325L of the cover member is prevented from glowing red.

This LED arrangement is common to other embodiments. Cases where two-color LEDs and one-color LEDs are used will be explained separately.

Figure 8(b) shows the lens 324 in Figure 8(a) as viewed from the front side in Figure 2. The lens 324 has the same cross-sectional shape in the depth direction (left-right direction in Figure 8(b)) and a constant height H.

Fig. 8(c) shows a lens 324G which is a variation of the lens 324. Protrusions 324G1 and 324G2 are provided corresponding to the position _G1 of the group LED 323-1 (G1) and the position _G2 of the group LED 323-1 (G2) on the LED side, and the lens 324G1 and 324G2 are provided to provide light collecting properties in the left and right directions in Fig. 8(c).

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.

<Embodiment 2>
In embodiment 2, lens 324 in embodiment 1 is changed to lens 324B, and the other components are the same as those used in embodiment 1. Accordingly, light source unit 320 is changed to light source unit 320B, and lighting device 300 is changed to lighting device 300B, but the names and symbols of the other components use the same names and symbols as those used in embodiment 1. The basic design of embodiment 3 is the same as embodiment 1, with L _B /L _A = 1.1, etc., but is characterized in that, compared to embodiment 1, the lens height H is increased and the distance d between the LED and the lens is reduced, and further, light incidence surfaces 324BS1 and 324BS2 on the lens side of the LED are made concave, increasing the amount of condensed light.

<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 composed of a recessed side surface 394 and a recessed bottom surface 395. The fixture body 310 (the same as that used in the first embodiment) of the lighting device 300B 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 320 is covered by the recessed side surface 394.

<LED and light>
In order to explain the optical system including the lens 324B, FIG. 10 shows a cross-sectional view of the light source unit 320 as viewed from a cross section perpendicular to the row direction of the light sources arranged in a row.

Among the light rays that can be collected by lens 324B, consider, as an example, light ray _P1 directed in the direction of LED emission angle _θ11 , which is an angle of 80 degrees to the left from the optical axis, that is, light ray _P11 from the LED to light incident surface 324BS1, light ray _P12 inside lens 324B, light ray _P13 from light emission surface 324BT1 to cover member 325, and light ray _P14 outside cover member 325. If diffusion at cover member 325 is ignored, LED emission angle _θ11 becomes a more collected external emission angle _θ14 .

A light ray _P21 traveling in the direction of the LED emission angle _θ21 to the right from the optical axis becomes a light ray _P24 that exits the light exit surface 324BT1, and the external emission angle _θ24 is smaller than the LED emission angle _θ21 . In other words, the light ray _P21 is condensed by the lens 324B.

Considering the light ray _P31 proceeding in the direction of the LED emission angle _θ31, which is an angle of 80 degrees to the right from the optical axis, the light ray is emitted from the light emission surface 324BT2, resulting in an unexpected direction. In the figure, the angle _θ34 happens to be smaller than the angle _θ31 , but the external emission angle of the light ray with the LED emission angle between _θ21 and θ31 and smaller than _θ31 depends on the place where the light ray passes through on the light emission surface 324T2, and therefore may or may not be focused. In FIG. 9 showing the installed state, the recessed side surface 394 is provided near the side surface of the cover member in order to block the light ray _P31 that is emitted from the side surface of the cover member.

Lens 324B has support protrusions 324BE5, 324BE5, which are fixed by cover member fixing parts 325E5, 325E6 and mounting fixing parts 321E5, 321E6.

<Illuminance simulation results>
FIG. 11 shows the results of illuminance simulation when the total luminous flux of the light source is 1000 lm in the second embodiment. The vertical axis is the distance from the light source, and the horizontal axis is the distance from directly below the light source. The illuminance at 1 m directly below the light source is 1480 lx, at 2 m it is 370 lx, at 3 m it is 160 lx, and at 4 m it is 92 lx. 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 realized. The part indicated by the star in the figure here is caused by leakage light consisting of components such as light ray _P31 , and causes unnecessary glare. As an example of the use of this lighting fixture, the side of the light source unit 320 is covered by the embedded side 394 as shown in FIG. 9 in order to deal with this leakage light.

To prevent light leakage, the light may be scattered by increasing the diffusion properties of the side surface 325Y6 while still being directly attached to the ceiling as in the first embodiment.

In the second embodiment, the L _B /L _A dependency is basically the same as in the first embodiment, but the angle range of the available light rays is expanded, and as a result, the overall amount of light is increased.

<Embodiment 3>
In the third embodiment, the lens 324 in the first embodiment is changed to a lens 324C, and the other components are the same as those used in the first embodiment. Accordingly, the light source unit 320 is changed to a light source unit 320C, and the lighting device 300 is changed to a lighting device 300C, but the names and symbols of the other components are the same as those used in the first embodiment, and the basic design of the third embodiment is the same as that of the first embodiment, for example, L _B /L _A = 1.1.

<LED and light>
In the third embodiment, the light ray P ₅₁ traveling in the direction at an angle θ ₅ from the LED 323-1 and the light ray P ₆₁ traveling in the direction at an angle θ ₆ from the LED 323-2 can also be extracted forward by utilizing total reflection at the portions provided on the sides of the lens.

To explain the optical system including lens 324B, FIG. 12 shows a cross-sectional view of light source unit 320 viewed from a cross section perpendicular to the row direction of the light sources arranged in a row.

Light ray _P51 enters lens 324 from light incident surface 324CS5 and travels as light ray _P521 , is totally reflected by total reflection surface 324CR5 provided on the outer left side of light exit surface 324CT1 of the convex portion of lens 324, travels as light ray _P522 , exits from light exit surface 324CT5 as light ray _P53 , and exits from cover member 325 as light ray _P54 .

Light ray _P61 enters lens 324 from light incident surface 324CS6 and travels as light ray _P621 , is totally reflected by total reflection surface 324CR6 and travels as light ray _P622 , exits from light exit surface 324CT6 as light ray _P63 , and exits from cover member 325 as light ray _P64 .

Lens 324C has support protrusions 324CE5, 324CE5, which are fixed by cover member fixing parts 325E5, 325E6 and mounting fixing parts 321E5, 321E6.

The tendency of the L _B /L _A dependency examined in the first embodiment basically remains unchanged, but the light amount increases overall due to the availability of the light rays P51 and P52.

<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, in addition to attachment and fixing portions 321NE5, 321NE6 of an attachment member 321N, lens attachment members 321NF5, 321NF6 may be provided, and lens 324N may be provided with lens attachment members 324NF5, 324NF6 that fit with these portions, and the lens 324N may be attached.

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

LEDs 323 may be three-color LEDs of R (red), G (green), and B (blue), or four-color LEDs of R, G, B, and W (white).

The number of LED rows is not limited to two, and an additional row may be provided between the two rows. In this case, L _A is the distance between the most distant rows, and L _B is the distance between the axes of the lenses corresponding to the most distant row. The number of LED rows is preferably 2 to 4, and more preferably 3 or less.

Lens 324 etc. has been described as two combined convex lenses, but it may be two independent lenses (or the number of LED rows).

The cross-sectional shape of the lens 324 etc. may be the same in the depth direction of FIG. 13, but may have convex portions corresponding to two groups such as LED 323-1 (G1) in FIG. 14, or may have convex portions corresponding to each LED 323-1 in FIG. 15.

The above disclosed embodiments are illustrative in all respects and are not intended to be a basis for 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. Furthermore, all modifications within the scope and meaning equivalent to the claims are included.

300, 300B, 300C Illumination device 310 Fixture body 312 Connector 320, 320B, 320C, 320N Light source unit 321, 321N Mounting member 321E5, 321E6 Mounting and fixing portion 321NE5, 321NE6 Mounting and fixing portion 321NF5, 321NF6, 324NF5, 324NF6 Lens mounting member 322 Substrate 324, 324B, 324C, 324G, 324N Lens 324BE5, 324BE5, 324CE5, 324CE5 Support protrusion 324BS1, 324BS1, 324BS2, 324CS5, 324CS6, 324S Light incident surfaces 324BT1, 324BT2, 324CT1, 324CT5, 324CT6, 324T1, 324T2 Light exit surfaces 324CR5, 324CR6 Total reflection surfaces 324G1, 324G2 Convex portion 325 Cover member 325E5, 325E6 Cover member fixing portion 325L Cover member left end surface 325M Cover member front portion 325Y5, 325Y6 Cover member side surface 325r Cover member right end surface 326 Power source 327 Wireless module 328 Mounting spring 329 Connector 370 Control device 371 Lighting control software 390 Ceiling 394 Recessed side surface 395 Recessed bottom surface

Claims (6)

A lighting device comprising a light source and a lens for condensing light emitted from the light source,
The light sources are 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 into which the light emitted from the light sources is 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, the number of the lens axes being determined by a position where the distance between the light entrance surface and the light exit surface is the largest;
The distance between the two rows of the light sources is L _A , the distance between the axes of the lenses corresponding to the light sources is L _B , and L _B /L _A is 1.05 or more and 1.21 or less.
Lighting equipment. The lighting device according to claim 1, further comprising a total reflection surface on the outer side between the axes of the lenses, the total reflection surface reflecting the incident light forward. The lighting device includes a substrate on which the light source is mounted and a mounting member for fixing the substrate,
The lighting device according to claim 1 or 2, wherein the lens is fixed to the mounting member. The lighting device further includes a cover member for covering the front and sides of the light source,
The lighting device according to claim 3 , wherein the lens is further supported by the cover member. The lighting device according to claim 1 or 2, wherein the light exit surface has the same cross-sectional shape in the row direction. 3. An illumination device according to claim 1 or 2, wherein the light exit surface has convexities which correspond to the light sources or groups of light sources in the row direction.