Light distribution control lens and lighting device

Abstract

To provide a light distribution control leans capable of suppressing color unevenness, and a lighting device.SOLUTION: A light distribution control lens is arranged opposite a white light source that uses a phosphor, and comprises a light incident surface into which light from the white light source is incident. On the light incident surface, a recess part is formed. The recess part has a light incident central surface that faces the white light source. On the light incident central surface, a V-groove is formed to deflect incident light toward a wide-angle side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a light distribution control lens and an illumination device including the same. [Background technology]

[0002] It is known that in LEDs (Light Emitting Diodes) that use yellow phosphors to obtain white light, the yellow component increases as the angle from the perpendicular line from the light-emitting surface increases. Patent Document 1 states that the yellowish fluorescent color component is emitted from the LED light-emitting surface at a biased angle over a wide range, and the structure is designed to prevent this wide-angle component from being extracted to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5331512 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when viewed at a microscopic scale, color bias exists even within the surface of the LED light source. Blue light is emitted directly below the LED chip, while yellowish light is emitted between the chips or between the chip and the white package. This color unevenness within the light-emitting surface can be projected onto the floor or wall through the lens. In particular, when controlling the light distribution over a wide angle with a lens and projecting light from above to below, there is an issue of yellowish tinge at the boundary between the bright and dark areas of the light irradiated onto some of the wall surfaces.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a light distribution control lens and a lighting device that can suppress color unevenness. [Means for solving the problem]

[0006] The light distribution control lens according to the present disclosure is a light distribution control lens that is arranged opposite a white light source that uses a phosphor, and has a light entrance surface into which light from the white light source is incident, and a recess is formed in the light entrance surface, and the recess has a light entrance central surface that faces the white light source, and a V-groove that deflects the incident light to the wide-angle side is formed in the light entrance central surface.

[0007] The lighting device according to the present disclosure includes the light distribution control lens according to the present disclosure and the white light source. [Effects of the Invention]

[0008] According to the present disclosure, color unevenness can be suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an exploded perspective view of a lighting device according to a first embodiment. [Figure 2] 2 is a cross-sectional view of an optical system showing the arrangement of a set of LEDs and lenses in the lighting device according to the first embodiment. FIG. [Figure 3] 2 is a cross-sectional view of an LED in the lighting device according to the first embodiment. FIG. [Figure 4] 4 is a diagram showing the trajectory of light emitted from the center of an LED via a light-incident side surface in the lighting device according to the first embodiment. FIG. [Figure 5] 4 is a diagram showing the trajectory of light emitted from an end of an LED via a light-incident side surface in the lighting device according to the first embodiment. FIG. [Figure 6] 4 is a diagram showing the trajectory of light emitted from the end of the LED chip region via the light incident central plane in the lighting device according to the first embodiment. FIG. [Figure 7] 4 is a diagram showing the trajectory of light emitted from a phosphor resin portion between the LED chip and the package via the light incident central plane in the lighting device according to the first embodiment. FIG. [Figure 8] 10 is a diagram showing areas of light rays emitted from the end of the LED chip area and the phosphor resin part via the light incident central plane in an illumination device according to a comparative example of the first embodiment. FIG. [Figure 9] FIG. 10 is a diagram showing the area of ​​light rays emitted from the end of the LED chip area and the phosphor resin part via the light incident central surface in a lighting device having a lens with lens shape 1. [Figure 10] 10 is a diagram showing the trajectory of light emitted from the end of the LED chip region via the light incident central plane in the lighting device according to the second embodiment. FIG. [Figure 11] 10 is a diagram showing the trajectory of light emitted from a phosphor resin portion between an LED chip and a package via a light incident central plane in the lighting device according to the second embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to the following embodiments and can be modified in various ways without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure includes all possible combinations of the configurations shown in the following embodiments. In particular, the combinations of components are not limited to those in each embodiment; components described in one embodiment can be applied to another embodiment. In the following description, directional terms (e.g., "up," "down," "right," "left," "front," "rear," etc.) are used as appropriate to facilitate understanding, but these are for explanatory purposes and do not limit the present disclosure. In each drawing, components designated with the same reference numerals are identical or equivalent, and this applies throughout the entire specification. Note that the relative dimensional relationships or shapes of each component in each drawing may differ from those in reality.

[0011] Embodiment 1 A light distribution control lens and a lighting device according to embodiment 1 will be described. FIG. 1 is an exploded perspective view of the lighting device according to this embodiment. In order to clarify the correspondence between FIG. 1 and drawings that will be described later, the following coordinate system is defined. The z-axis is taken along the radiation optical axis of LED 12, and the direction of light irradiation by the lighting device is taken as the +z-direction. Two directions that are orthogonal to each other on a plane perpendicular to the z-axis are taken as the x-axis and y-axis. As shown in FIG. 1, the lighting device has a frame 4, a cover glass 3, a lens member 2, a light source module 1, and a housing 5.

[0012] The light source module 1 includes a printed circuit board 11 and a plurality of LEDs 12 mounted on the printed circuit board 11. The plurality of LEDs 12 are arranged, for example, in a matrix on the printed circuit board 11 along the x-axis and y-axis.

[0013] The lens member 2 is molded from a transparent resin. The lens member 2 has a plurality of lenses 20 (see FIG. 2). Each lens 20 is provided corresponding to each LED 12. Each lens 20 is disposed at a fixed distance from the corresponding LED 12. Each lens 20 is a light distribution control lens that controls the distribution of light from the LED 12. The lens member 2 is fixed by being sandwiched between a frame 4 and a housing 5 via a cover glass 3 for protection from the external environment.

[0014] Although not shown, the housing 5 is provided with a power supply circuit for supplying power to the light source module 1 and fins for heat dissipation.

[0015] 2 is a cross-sectional view of an optical system showing the arrangement of a pair of LEDs 12 and a lens 20 in a lighting device according to this embodiment. As shown in FIG. 2, the light source module 1 has a configuration in which the LEDs 12 are soldered to a printed circuit board 11. The LEDs 12 are white light sources that use phosphors. The LEDs 12 used are surface-mounted LEDs with a dome-shaped lens mounted on the emitting surface, but ordinary surface-mounted LEDs without a lens can also be used.

[0016] The lens 20 is disposed so that its central axis coincides with the radiation optical axis of the LED 12. The lens 20 has a light incident surface 20a, a side surface 23, and a light exit surface 24. Light from the LED 12 is incident on the light incident surface 20a. A recess 20b having a light incident side surface 21 and a light incident central surface 22 is formed in the light incident surface 20a. The light incident side surface 21 corresponds to the inner wall surface of the recess 20b and is formed along the radiation optical axis of the LED 12. The light incident central surface 22 corresponds to the bottom surface of the recess 20b and is formed perpendicular to the radiation optical axis of the LED 12. The lens 20 is disposed so that the light incident side surface 21 and the light incident central surface 22 cover the LED 12.

[0017] The light incident central surface 22 protrudes in a stepped manner from the light incident side surface 21 toward the central axis of the lens 20. The light incident central surface 22 has multiple horizontal surfaces perpendicular to the z-axis and inclined surfaces connecting two adjacent horizontal surfaces. The horizontal surfaces and inclined surfaces are arranged, for example, in a concentric pattern around the central axis of the lens 20.

[0018] A V-groove 22a that deflects incident light toward the wide-angle side is formed near the center of the light incident central surface 22. The V-groove 22a is formed in a V-shape in a cross section including the central axis of the lens 20. When viewed along the central axis of the lens 20, the V-groove 22a extends circumferentially with the central axis of the lens 20 as the center.

[0019] Light incident on the lens 20 from the light-incident side surface 21 is totally reflected by the side surface 23 and emitted from the light-exiting surface 24. Light incident on the lens 20 from the light-incident central surface 22 is emitted directly from the light-exiting surface 24 without being reflected. The light-exiting surface 24 is formed perpendicular to the radiation axis of the LED 12. The cover glass 3 is disposed opposite the light-exiting surface 24. In this embodiment, the relationship between the diameter A of the light-incident central surface 22 of the lens 20 and the diameter B of the LED 12 is in the range of 1≦A / B≦2. That is, in this embodiment, when viewed in the direction of the radiation axis of the LED 12, the diameter A of the light-incident central surface 22 of the lens 20 is greater than or equal to the diameter B of the LED 12 and is less than or equal to twice the diameter B of the LED 12.

[0020] Fig. 3 is a cross-sectional view of an LED 12 in a lighting device according to this embodiment. As shown in Fig. 3, the LED 12 has an LED chip 121, a package 122, and an upper LED lens 124. Four LED chips 121 are arranged in a 2x2 pattern inside a white package 122 with a recessed center. The periphery of the LED chip 121 is sealed with a resin containing a yellow phosphor. As a result, a phosphor resin portion 123 is formed around the LED chip 121.

[0021] The area directly above the LED chip 121 glows brightly white. The gaps between the LED chips 121 and the area between the LED chip 121 and the side wall of the package 122 glow yellow due to the influence of the color emitted by the phosphor. The area between the LED chip 121 and the side wall of the package 122 becomes darker as it moves away from the LED chip 121. For this reason, the area near the side wall of the package 122 is where deep yellow light accumulates.

[0022] Regarding the light intensity, the intensity is almost the same anywhere on the surface of the LED chip 121, but the radiation intensity drops sharply away from the LED chip 121. The intensity of the yellow region between the LED chip 121 and the sidewall of the package 122 is about one-fifth of the intensity at the edge of the LED chip 121.

[0023] The phenomenon of yellow light shining near the periphery of the package is also seen in COB (Chip On Board) devices that have multiple LED chips mounted on them, and this embodiment is also effective for COB light sources.

[0024] In this embodiment, the ratio of diameter A of center plane 22 of lens 20 to diameter B of LED 12 is approximately 1:0.6, and LED 12 is no longer considered a point light source. In such a case, color breakup will occur unless the design takes into account the bias in emitted color depending on the light-emitting position.

[0025] The mechanism by which color unevenness occurs will be explained separately for light emitted via the light-receiving side surface 21 and light emitted via the light-receiving central surface 22.

[0026] 4 is a diagram showing the trajectory of light emitted from the center of LED 12 via light-incident side surface 21 in the lighting device according to this embodiment. Light is assigned as S1 to S5 in order from the wide-angle side with respect to the z axis. Light S1 and S2 are deflected by side surface 23 and emitted almost directly ahead. Light S3 to S5 are totally reflected in the direction opposite to the initial emission direction with respect to the z axis, and light S4 and S5 in particular are designed to be deflected toward the wide-angle side.

[0027] 5 is a diagram showing the trajectory of light emitted from the end of LED 12 via light incident side surface 21 in the lighting device according to this embodiment. Light is assigned as S6 to S10 in order from the wide-angle side with respect to the z axis. At the end of LED 12, there are points close to light incident side surface 21 and points far from light incident side surface 21, but we will only consider the points close to light incident side surface 21, which have a large solid angle and have a large influence.

[0028] The light of S6 and S7 is deflected outward, slightly spreading from the front, while the light of S8 and S9 is deflected inward, opposite to its initial radiation direction relative to the z-axis. The initial radiation directions of S7 and S8 are roughly the same, but change direction significantly from outward to inward at the side surface 23. This is because the side surface 23 is not curved, but has a polygonal shape divided into multiple parts. That is, the side surface 23 is formed into a polygonal shape in a cross section including the central axis of the lens 20. The polygonal shape of the side surface 23 allows light to be deflected inward and outward, suppressing color unevenness. The light of S10 is deflected significantly outward. While these are not desirable from the perspective of suppressing color unevenness, they are considered acceptable if the total amount of light is small.

[0029] FIG. 6 shows the trajectories of light emitted from the edge of the LED chip 121 region via the light-incident central surface 22 in the lighting device according to this embodiment. Light is assigned to MC1 to MC8 in order from the widest angle side with respect to the z-axis, and the characteristic behavior of the light will be described. Light MC1 to MC4 enter the lens 20 from each horizontal surface of the light-incident central surface 22. The angle of the slope of the light-incident central surface 22 is determined so that light MC1 to MC4 enters from each horizontal surface. Therefore, the angle of each slope of the light-incident central surface 22 is changed so that the slopes closer to the edge of the light-incident central surface 22 are closer to the horizontal surface and the slopes closer to the center are closer to the vertical surface. Because light MC1 to MC4 enter the lens 20 from each horizontal surface, the radiation angle of light MC1 to MC4 emitted from the light-exiting surface 24 is the same as the radiation angle of the original light.

[0030] MC5 and MC6 are light beams that enter the V-groove 22a. The MC5 and MC6 light beams are deflected significantly by the slope of the V-groove 22a and emitted from the light-emitting surface 24 in a wide-angle direction similar to that of MC1 and MC2. The MC5 and MC6 light beams are emitted at an angle of 30° or less with respect to the LED chip normal, which is parallel to the z-axis. The color of the light from the LED chip 121 changes depending on the emission angle, but within this range of emission angles, the color of the MC5 and MC6 light beams is almost white.

[0031] MC7 is light that is deflected by the slope of the light-entering central surface 22. When the emission angle becomes small, the light is deflected by the slope of the light-entering central surface 22 in this way, but because the original emission angle is small, the deflection angle is also small. MC8 light travels almost parallel to the emission optical axis and is incident almost perpendicularly on the horizontal plane of the light-entering central surface 22, so it is emitted almost perpendicularly from the light-exiting surface 24.

[0032] 7 is a diagram showing the trajectory of light emitted from the phosphor resin part 123 between the LED chip 121 and the package 122 via the light incident central plane 22 in the lighting device according to this embodiment. The light is assigned as MS1 to MS8 in order from the wide-angle side with respect to the z axis, and the characteristic behavior of the light will be explained.

[0033] Like MC1 to MC4, the light beams MS1 to MS4 are incident on the horizontal plane of the light incident central plane 22. However, since their light emission positions are outside the light emission positions at the ends of the LED chip 121 area, the angle of incidence on the horizontal plane is larger than that of the light at the ends of the LED chip 121 area, and they are deflected to a wider angle.

[0034] Light beams MS5 and MS6 are incident on the V-groove 22a. As described above, the light emission positions are outside the light emission positions at the ends of the LED chip 121 area, and therefore the light is largely deflected by the slope of the V-groove 22a and deflected to a wider angle than the light at the ends of the LED chip 121 area.

[0035] MS7 is light deflected by the inclined plane of the light-entering central surface 22. MS8 is light emitted perpendicularly from the light-exiting surface 24. These lights have no notable characteristics in terms of color unevenness.

[0036] 8 is a diagram showing the area of ​​light rays emitted from the end of the LED chip 121 area and the phosphor resin part 123 via the light incident central surface 22 in an illumination device according to a comparative example of this embodiment. Unlike the configuration of this embodiment, the configuration of this comparative example has the light incident central surface 22 formed in a flat, planar shape. In FIG. 8, the light dotted area represents the area of ​​light emitted from the end of the LED chip 121 area, and the dark dotted area represents the area of ​​light emitted from the phosphor resin part 123 between the LED chip 121 and the package 122.

[0037] As shown in Figure 8, the dark dot area is wider than the light dot area on the wide-angle side. Light in this angle range causes a yellow band known as color unevenness. Thus, if there is no pattern on the central light incident surface 22, the light from the phosphor resin part 123 will be the light with the widest angle, and the boundary between the dark and light areas will be illuminated yellow.

[0038] Two lens shapes are compared with respect to the light incident central surface 22 of lens 20. Lens shape 1 is a comparative lens shape that takes into consideration only light distribution control. FIG. 9 is a diagram of the area of ​​light rays emitted from the end of the LED chip 121 area and the phosphor resin part 123 via the light incident central surface 22 in an illumination device having lens 20 of lens shape 1. As shown in FIG. 9, lens shape 1 is simply a shape in which the light incident central surface 22 protrudes in a conical shape in the -z direction.

[0039] Lens shape 2 is a lens shape of this embodiment that takes into consideration color unevenness as well as light distribution control. As shown in Figures 2 and 4 to 7, lens shape 2 is a shape in which light incident central surface 22 is formed in a stepped shape and a ring-shaped groove is formed.

[0040] The lighting fixture was aimed downward to project light, and the color unevenness in the area where the light incident from the central light incident surface 22 illuminated the wall surface was observed. When lens shape 1 was used, a yellow light band was formed at the boundary between the dark and light areas. In contrast, when lens shape 2 was used, the yellow light band expanded, and it was found that the color unevenness was alleviated.

[0041] In this embodiment, the lens diameter of LED 12 is 3.2 mm, the diameter of light incident central surface 22 of lens 20 is 4 mm, and the distance from the substrate surface of light source module 1 to light incident central surface 22 of lens 20 is 2.9 mm at the maximum and 2.6 mm at the closest surface. Also, the center of V-groove 22a is located 2.7 mm away from the lens central axis, the width of V-groove 22a is 0.3 mm, and the angle of the inclined surface of V-groove 22a, which has the above-mentioned deflection effect, is 25° with respect to the horizontal plane.

[0042] Generally, it is believed that color unevenness can be suppressed if light with a radiation angle of 0° to 35° from the LED chip 121 can be deflected in a direction of 50° to 60°. For this reason, the angle of the V-groove 22a for deflection is adjusted within the range of 20° to 70° with respect to the horizontal plane.

[0043] In this embodiment, the V-groove 22a for suppressing color unevenness is provided in one location directly below the LED chip 121, but this is due to processing accuracy, and V-grooves 22a may be provided in multiple locations directly below the LED 12.

[0044] As described above, the light distribution control lens according to the present embodiment is disposed opposite LED 12 that uses a phosphor. LED 12 is an example of a white light source. The light distribution control lens has light incident surface 20a onto which light from LED 12 is incident. Light incident surface 20a is formed with recess 20b. Recess 20b has light incident central surface 22 that faces LED 12. Light incident central surface 22 is formed with V-groove 22a that deflects incident light to the wide-angle side.

[0045] With this configuration, the problem of the boundary between the bright and dark areas of the light irradiated onto the wall surface being illuminated yellow can be addressed by deflecting the white light directly below the LED chip toward the wide-angle side using the V-groove 22a, allowing the white light to be superimposed on the yellow area. This makes it possible to suppress color unevenness. With this configuration, fluorescent light is not removed, so light loss can be reduced. In this embodiment, a light utilization efficiency of nearly 95% can be achieved with the light distribution control lens alone.

[0046] The light distribution control lens according to the present embodiment further includes side surfaces 23 that totally reflect a portion of the light incident from light entrance surface 20 a. Side surfaces 23 are formed in a polygonal shape in a cross section including the central axis of lens 20.

[0047] According to this configuration, the direction of light reflected by the side surface 23 can be deflected inward and outward, thereby suppressing color unevenness.

[0048] The light distribution control lens according to the present embodiment is disposed opposite LED 12 that uses a phosphor. LED 12 is an example of a white light source. The light distribution control lens includes light incident surface 20a onto which light from LED 12 is incident, and side surface 23 that totally reflects a portion of the light incident from light incident surface 20a. Side surface 23 is formed in a polygonal shape in a cross section including the central axis of lens 20.

[0049] According to this configuration, the direction of light reflected by the side surface 23 can be deflected inward and outward, thereby suppressing color unevenness.

[0050] The lighting device according to the present embodiment includes the light distribution control lens according to the present embodiment and an LED 12. According to this configuration, the lighting device can achieve the same effects as those described above.

[0051] Embodiment 2 A light distribution control lens and lighting device according to embodiment 2 will be described. In embodiment 1, a wide-angle lens was described. In this embodiment, measures to prevent color unevenness in a medium-angle lens, which has a slightly narrower illumination angle spread than a wide-angle lens, will be described. Note that components having the same functions and actions as those in embodiment 1 will be assigned the same reference numerals and their description will be omitted.

[0052] In the lens shape shown in Figure 9, the light incident central surface 22 protrudes conically in the -z direction, so that the light emitted at a wide angle from the end of the LED chip 121 area and the phosphor resin part 123 is deflected vertically when it enters from the inclined slope, thereby narrowing the spread angle.

[0053] The lighting fixture was aimed downward to project light, and the color unevenness of the area on the wall where the light incident from the central light incident surface 22 illuminated was observed. With the lens shape shown in Figure 9, the light is focused at a narrow angle, so the position where the light is irradiated on the wall is lowered, and the yellow band-like area appears to stand out more clearly than with a wide angle.

[0054] Fig. 10 is a diagram showing the trajectory of light emitted from the end of the LED chip 121 region via the light-entering central surface 22 in the lighting device according to this embodiment. As shown in Fig. 10, the light-entering central surface 22 protrudes in a stepped manner from the light-entering side surface 21 toward the central axis of the lens 20. The light-entering central surface 22 has multiple horizontal surfaces perpendicular to the z-axis and inclined surfaces connecting two adjacent horizontal surfaces. The horizontal surfaces and inclined surfaces are arranged, for example, in a concentric pattern around the central axis of the lens 20.

[0055] A trapezoidal groove 22b is formed in the center of the light incident central surface 22. The trapezoidal groove 22b is a recess formed in a trapezoidal shape in a cross section including the central axis of the lens 20. When viewed along the central axis of the lens 20, the trapezoidal groove is formed in a circular shape centered on the central axis of the lens 20. A V-shaped groove 22a may be formed on the light incident central surface 22 outside the trapezoidal groove 22b, as in the first embodiment.

[0056] Using the z-axis direction as a reference, the light sources are assigned MC11 to MC16 in order from the wide-angle side, and the characteristic light behaviors will be described below. The light from MC11 enters from a slope that slopes downward toward the central axis of lens 20. As a result, the light from MC11 is deflected toward the front and crosses the light from MC12 that enters from the horizontal surface. The light from MC13 enters from a slope that slopes upward toward the central axis of lens 20, that is, the slope of trapezoidal groove 22b, and is therefore deflected toward the wide-angle side. The inclination of the slope of trapezoidal groove 22b is determined so that the light from MC13 reaches the yellow part of the wall surface when the lighting fixture is pointed downward to project light.

[0057] Light from MC14 is incident on the horizontal plane of light-entering central plane 22. This region is directly below LED chip 121, so whether it is a horizontal plane or a cone-shaped region convex in the -Z direction does not have a significant effect on the light distribution.

[0058] The light from MC15 is incident on the slope that slopes downward toward the central axis of lens 20, i.e., the slope of trapezoidal groove 22b. However, because the slope and the light source are on the same side of the central axis of lens 20, the light is deflected vertically. The light from MC16 is incident on a horizontal surface, so it is emitted at the original emission angle.

[0059] 11 is a diagram showing the trajectory of light emitted from the phosphor resin part 123 between the LED chip 121 and the package 122 via the light incident central surface 22 in the lighting device according to this embodiment. As with the light emitted from the end of the LED chip 121 region via the light incident central surface 22, the light is assigned MS11 to MS16 in order from the wide-angle side for each incident surface. The behavior of each light is similar to that of the light rays MC11 to MC16 with the same number.

[0060] As described above, the inclination of the slope of trapezoidal groove 22b is determined so that the light of MC13 reaches the yellow part of the wall surface, and therefore the light of MS13 is deflected to an even wider angle than MC 13. As a result, some of the yellow light is pushed to the dark part of the wall surface, but this is not noticeable because the original amount of light itself is not large.

[0061] The lighting fixture was used to project light downward, and the color unevenness of the portion of the wall surface illuminated by the light incident from the central light incident surface 22 was observed. In this embodiment, it was found that the width of the yellow band widened and the color became lighter by deflecting the light toward the dark side.

[0062] As described above, the light distribution control lens according to the present embodiment is disposed opposite LED 12 that uses a phosphor. LED 12 is an example of a white light source. The light distribution control lens has light incident surface 20a onto which light from LED 12 is incident. Light incident surface 20a is formed with recess 20b. Recess 20b has light incident central surface 22 that faces LED 12. Light incident central surface 22 is formed with trapezoidal groove 22b that deflects incident light to the wide-angle side.

[0063] This configuration addresses the problem of the boundary between the bright and dark areas of the light irradiated onto the wall being illuminated yellow by deflecting the white light directly below the LED chip toward the wide-angle side using the trapezoidal groove 22b, allowing the white light to be superimposed on the yellow area. This reduces color unevenness. This configuration also reduces light loss because the fluorescent light is not removed.

[0064] The above describes the embodiments of the present disclosure. The embodiments of the present disclosure are configured to be flexible in accordance with the number of LEDs, which is determined depending on the external shape, external dimensions, brightness, etc. of the lighting device. Furthermore, since the configuration can be made using relatively inexpensive, general-purpose LEDs, it is also excellent in terms of economy.

[0065] Various aspects of the present disclosure are described below.

[0066] (Appendix 1) A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident, a recess is formed on the light incident surface, the recess has a light-entering central surface facing the white light source, The light distribution control lens has a V-shaped groove formed on the central light incident surface to deflect the incident light to the wide-angle side. (Appendix 2) A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident, a recess is formed on the light incident surface, the recess has a light-entering central surface facing the white light source, The light distribution control lens has a trapezoidal groove formed on the central light incident surface that deflects incident light to the wide-angle side. (Appendix 3) further comprising a side surface that totally reflects a portion of the light incident from the light incident surface, 3. The light distribution control lens according to claim 1, wherein the side surface is formed in a polygonal shape in a cross section including the central axis. (Appendix 4) A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident; a side surface that totally reflects a portion of the light incident from the light entrance surface; Equipped with The light distribution control lens, wherein the side surface is formed in a polygonal shape in a cross section including the central axis. (Appendix 5) When viewed in the direction of the radiation axis of the white light source, The diameter of the light entrance central surface is 5. The light distribution control lens according to any one of claims 1 to 4, which has a diameter equal to or less than twice the diameter of the white light source. (Appendix 6) A light distribution control lens according to any one of Supplementary Note 1 to Supplementary Note 5; the white light source; A lighting device comprising: [Explanation of symbols]

[0067] 1 light source module, 2 lens member, 3 cover glass, 4 frame, 5 housing, 11 printed circuit board, 12 LED, 20 lens, 20a light incident surface, 20b recess, 21 light incident side surface, 22 light incident central surface, 22a V-groove, 22b trapezoidal groove, 23 side surface, 24 light output surface, 121 LED chip, 122 package, 123 phosphor resin part, 124 LED upper lens.

Claims

1. A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident, a recess is formed on the light incident surface, the recess has a light-entering central surface facing the white light source, The light distribution control lens has a V-shaped groove formed on the central light incident surface to deflect the incident light to the wide-angle side.

2. A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident, a recess is formed on the light incident surface, the recess has a light-entering central surface facing the white light source, The light distribution control lens has a trapezoidal groove formed on the central light incident surface that deflects incident light to the wide-angle side.

3. further comprising a side surface that totally reflects a portion of the light incident from the light incident surface, The light distribution control lens according to claim 1 , wherein the side surface is formed in a polygonal shape in a cross section including a central axis.

4. A light distribution control lens disposed opposite a white light source using a phosphor, a light entrance surface onto which light from the white light source is incident; a side surface that totally reflects a portion of the light incident from the light entrance surface; Equipped with The light distribution control lens, wherein the side surface is formed in a polygonal shape in a cross section including the central axis.

5. When viewed in the direction of the radiation axis of the white light source, The diameter of the light entrance central surface is 2. The light distribution control lens according to claim 1, wherein the diameter of the light distribution control lens is equal to or less than twice the diameter of the white light source.

6. The light distribution control lens according to any one of claims 1 to 5, the white light source; A lighting device comprising:

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