JP6674416B2 - Lighting equipment - Google Patents

Description

  The present invention relates to a lighting device.

  Conventionally, an illumination device having an optical member and a reflection plate has been known. A part of the light emitted from the light source becomes the illumination light directly via the optical member, and the other part enters the reflection plate via the optical member and is reflected by the reflection plate to become the illumination light. A conventional illumination device having an optical member and a reflection plate is disclosed in, for example, Japanese Patent Application Laid-Open No. H11-163,837.

JP 2014-529174 A

  In the lighting device, the lighting effect differs depending on the light distribution angle, the axial luminous intensity, the central illuminance, and the illuminance distribution. Therefore, it is required to control the light distribution angle and light distribution of the lighting device.

  If a reflector is used, light incident on the reflector from a light source can be reflected in a desired direction. In addition, if the optical member is used, the light emitted from the light source can be appropriately refracted toward the reflection plate or the irradiation direction. However, depending on the combination of the optical member and the reflection plate, light irradiated in an unwanted direction may appear.

  The present invention has been made in view of such circumstances, and has as its object to provide a lighting device that can obtain a desired light distribution.

  In order to solve the above-described problems, the invention of the present application provides a light source, a reflector having a dome-shaped inner peripheral surface that increases in diameter from a rear end disposed near the light source toward an opening at a front end, A part is arranged on the front side of the light source, and at least a part has an optical member arranged inside the reflection plate, and the optical member has a cylindrical portion whose diameter decreases toward the front side. A lens portion that covers the front side of the tube portion, and an inner connection portion that is a boundary portion between an inner peripheral surface of the tube portion and a rear surface of the lens portion has a cross section passing through an optical axis of the light source. Arranged on a first straight line connecting one end in the radial direction of the light emitting region of the light source and the other end in the radial direction of the opening, or in the vicinity of the first straight line and radially outside the first straight line. It is a lighting device.

  According to the invention of the present application, an illuminating device that can obtain a desired light distribution can be obtained.

It is a side view of an example of a lighting device. It is sectional drawing of an example of a lighting device. It is a sectional view of a lighting part of a lighting installation concerning a 1st embodiment. FIG. 2 is a partial cross-sectional view of the optical member according to the first embodiment. FIG. 9 is a diagram illustrating an example of an optical path of an illumination unit according to a comparative example. FIG. 3 is a diagram illustrating an example of an optical path of a lighting unit according to the first embodiment. FIG. 9 is a diagram illustrating an example of an optical path of an illumination unit according to a comparative example. FIG. 3 is a diagram illustrating an example of an optical path of a lighting unit according to the first embodiment. It is sectional drawing of the illumination part of the illumination device which concerns on 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<1. Configuration of lighting device>
First, the overall configuration of a lighting device according to the present invention will be described using the lighting device 1 as an example with reference to FIGS. Further, a detailed configuration of the illumination unit 10 of the illumination device 1 according to the present invention will be described in first to third embodiments described later.

  FIG. 1 is a side view of a lighting device 1 which is an example of the lighting device of the present invention. FIG. 2 is a cross-sectional view of the lighting unit 10 of the lighting device 1. The lighting device 1 is a so-called spotlight that emits light in a specific direction. As an example, the lighting device 1 is attached and fixed to a duct rail arranged on a ceiling.

  As shown in FIG. 1, the lighting device 1 includes an illumination unit 10 that irradiates illumination light, a heat sink 11 that dissipates heat of the illumination unit 10, a fixing unit 12 that is fixed to a ceiling, and a fixing unit 12. On the other hand, it has an illumination unit 10 and an arm unit 13 that rotatably supports the heat sink 11.

  As shown in FIGS. 1 and 2, the illumination unit 10 includes a light source 21, an optical member 22, a reflector 23, and a baffle 24. In the present embodiment, the components constituting the illumination unit 10 are arranged around the central axis 9 of the annular reflector 23.

  The light source 21 is a COB (Chip on Board) type LED light source. Here, the optical axis of the light source 21 is arranged along the central axis 9. Hereinafter, the direction along the central axis 9 where the light source 21 emits light is referred to as “front” or “front”, and the direction opposite to the front is referred to as “rear” or “rear”. Further, a direction along a circumference around the center axis 9 is referred to as a “circumferential direction”, and a direction orthogonal to the center axis 9 is referred to as a “radial direction”. The light emitting area of the COB is, for example, a circle having a diameter of 6 mm to 33 mm.

  The front surface of the light source 21 is a light emitting surface of the light source 21. On the back side of the light emitting surface of the light source 21, that is, on the rear side of the light source 21, the heat sink 11 as a heat radiating part is arranged. The heat sink 11 has a light source arrangement part 111 arranged along the back surface of the light source 21 and a plurality of heat radiation fins 112 arranged substantially perpendicular to the light source arrangement part 111. The light source 21 is fixed to the front surface of the light source placement unit 111. As a result, the heat generated in the light source 21 and transmitted through the light source arrangement portion 111 is radiated into the air through the radiation fins 112.

  The optical member 22 is a translucent member, at least a part of which is arranged in front of the light source 21. Further, at least a part of the optical member 22 is disposed radially inside the reflection plate 23. The optical member 22 has a cylindrical portion 221, a lens portion 222, a ring portion 223, and a base portion 224.

  The cylindrical portion 221 is a cylindrical portion having a conical surface whose outer surface is reduced in diameter toward the front side or a shape slightly wider than the conical surface. The tube portion 221 is arranged on the front side of the light source 21. The lens part 222 covers the front side of the cylindrical part 221. The annular portion 223 is a plate-like and annular plate portion arranged substantially perpendicular to the central axis 9 on the front side of the light source 21. The inner edge of the annular portion 223 is connected to the rear end of the cylindrical portion 221. The base part 224 is a cylindrical part that covers the radial outside of the light emitting region of the light source. The front end of the base 224 is connected to the outer edge of the ring 223.

  The reflection plate 23 is an annular member centered on the central axis 9 and having an open front end. Here, the opening on the front side of the reflection plate 23 is referred to as a reflection plate opening 230. The reflecting plate 23 has a dome-shaped inner peripheral surface 30 whose diameter increases from the rear end disposed near the light source 21 toward the reflecting plate opening 230 at the front end. The inner peripheral surface 30 is arranged along a reference curved surface whose curvature decreases toward the front side. The reference curved surface is arranged on a curved surface of a rotating body that rotates a curve around the central axis 9.

  Almost the entire inner peripheral surface 30 is provided with a facet reflector 301 in each of a plurality of small regions obtained by dividing the reference curved surface in the front-rear direction and the circumferential direction. For example, 60 facet reflectors 301 are provided every 6 ° in the circumferential direction. Each facet reflector 301 is planar. Note that the inner peripheral surface 30 may not have the facet reflector 301. Further, each facet reflector 301 may be a curved surface projecting radially inward.

  In the lighting device 1, the light source 21 is disposed behind the rear end of the reflection plate 23. Further, most of the cylindrical portion 221 of the optical member 22 and the lens portion 222 are accommodated inside the reflecting plate 23 in the radial direction.

  The baffle 24 is a substantially cylindrical member arranged on the front side of the reflection plate 23. The inner peripheral surface of the baffle 24 is provided with a plurality of steps arranged at intervals in the front-rear direction so as to prevent the inner peripheral surface from shining. The rear end of the inner peripheral surface where the step of the baffle 24 is provided is arranged close to the reflector opening 230. Here, the opening on the front side of the baffle 24 is referred to as a baffle opening 240.

  In order to arrange the baffle 24 on the front side of the reflector 23, the baffle 24 is fixed to the heat sink 11 via the support member 25. In the example of FIG. 2, the support member 25 and the heat sink 11 are fixed by screws. Further, the support member 25 and the baffle 24 are fixed by meshing with each other in the thread grooves. Note that the support member 25 and the heat sink 11 and the support member 25 and the baffle 24 may be fixed to each other by another fixing method.

  When a driving current is supplied to the light source 21 from a separate power supply device (not shown) outside the lighting device 1, light is emitted from the light source 21 toward the front side and centered on the central axis 9. Then, the light emitted from the light source 21 passes through the optical member 22 to the reflection plate 23, the baffle 24, and the baffle opening 240. The specific traveling direction of the light emitted from the light source 21 will be described in detail in each embodiment described later.

<2. First Embodiment>
Next, the structure of the illumination unit 10A of the illumination device according to the first embodiment will be described. FIG. 3 is a cross-sectional view of the lighting unit 10A of the lighting device according to the first embodiment. In FIG. 3, illustration of the facet reflector provided on the inner peripheral surface 30A of the reflection plate 23A is omitted. As shown in FIG. 3, the illumination unit 10A has a light source 21A, an optical member 22B, a reflector 23A, and a baffle 24A. The basic configuration of each of the units 21A to 24A of the illumination unit 10A is the same as that of each of the units 21 to 24 of the illumination unit 10 described above. Here, the characteristic portion of the illumination unit 10A will be described with reference to FIG.

  As shown in FIG. 3, in a cross section including the central axis 9A, a straight line connecting one radial end 211A of the light emitting area of the light source 21A and the other radial end 232A of the reflector opening 230A is a first straight line L11A and a light source 21A. A straight line connecting the other radial end 212A of the light emitting region and the radial one end 231A of the reflector opening 230A is referred to as a first straight line L12A. In addition, a straight line connecting the radial one end 211A of the light source 21A and the radial one end 241A of the baffle opening 240A is defined as a second straight line L21A, the radial other end 212A of the light source 21A and the radial direction of the baffle opening 240A. A straight line connecting the other side end 242A is referred to as a second straight line L22A. The intersection of the first straight line L11A and the second straight line L22A is called an intersection C1A, and the intersection of the first straight line L12A and the second straight line L21A is called an intersection C2A.

  Light emitted from the light source 21A and having passed through the cylindrical portion 221A travels to the reflecting plate 23A and the baffle 24A. In the optical member 22A, the outer connecting portion 41A (see FIG. 4), which is the boundary between the outer peripheral surface of the cylindrical portion 221A and the front surface of the lens portion 222A, is on the first straight lines L11A and L12A in a cross section passing through the central axis 9A. Be placed. This makes it possible to improve the ratio of the light emitted from the light source 21A and passing through the cylindrical portion 221A to the reflection plate 23A. As a result, the illumination efficiency can be improved, and the desired light distribution performance can be brought close.

  When the outer connecting portion 41A is arranged radially inward of the first straight lines L11A and L12A, the cylindrical portion is emitted from the light source 21A as compared with the case where the outer connecting portion 41A is arranged on the first straight lines L11A and L12A. Of the light passing through 221A, the proportion of light going to baffle 24A increases. In that case, lighting efficiency and light distribution performance are reduced. Therefore, the outer connecting portion 41A may be arranged near the first straight lines L11A and L12A and radially outside the first straight lines L11A and L12A. In this case, even if there is a dimensional error in manufacturing, it is possible to suppress a decrease in illumination efficiency and light distribution performance.

  Further, the outer connection portion 41A is arranged on the intersections C1A and C2A in a cross section passing through the central axis 9A. Accordingly, light emitted from the light source 21A and passing through the cylindrical portion 221A hits one of the inner peripheral surfaces of the reflection plate 23A and the baffle 24A, and does not go to the baffle opening 240A. This suppresses the light emitted from the light source 21A and passing through the cylindrical portion 221A from being directly irradiated to the outside of the lighting device. That is, a glareless lighting device can be obtained.

  If the outer connection portion 41A is arranged radially inside the intersections C1A and C2A, part of the light emitted from the light source 21A and passing through the cylindrical portion 221B is directly illuminated without hitting the reflection plate 23A and the baffle 24A. Irradiated outside the device. Therefore, the outer connection portion 41A may be arranged near the intersections C1A and C2A and radially outside the intersections C1A and C2A. In this case, even when there is a dimensional error in manufacturing, the light emitted from the light source 21A and passed through the cylindrical portion 221A is prevented from being directly irradiated to the outside of the lighting device.

The design light distribution angle of the reflector 23A is not less than 25 ° and not more than 50 °. However, the light distribution angle is “beam divergence (50%)” defined in JIS C 8105-5. As described above, when the light distribution angle of the reflection plate 23A is a relatively large light distribution angle such as a wide angle, the lens unit 222A is closer to the light source 21A as compared with the illumination unit whose light distribution angle is narrow or medium. Is preferred. In this case, by arranging the position of the outer connection portion 41A as described above, it is possible to realize a relatively large light distribution angle while suppressing a decrease in illumination efficiency and light distribution performance. That is, when the light distribution angle of the reflecting plate 23A is a relatively large light distribution angle such as a wide angle, setting the position of the outer connection portion 41A as described above is particularly useful.

  FIG. 4 is a partial cross-sectional view of the optical member 22A. As shown in FIG. 4, the cylindrical portion inner peripheral surface 50A that is the inner peripheral surface of the cylindrical portion 221A of the optical member 22A has a first inner peripheral surface 51A and a second inner peripheral surface 52A. The angle of the first inner peripheral surface 51A with respect to the central axis of the cylindrical portion 221A, that is, the central axis 9 is the first angle θ1. 52A of 2nd inner peripheral surfaces are arrange | positioned between the inner connection part 42A which is a boundary part of 50 A of cylinder part inner surfaces, and the rear surface of the lens part 222A, and 51A of 1st inner peripheral surfaces. The second inner peripheral surface 52A has a second angle θ2 whose angle with respect to the central axis 9A is larger than the first angle θ1. As described above, the cylindrical portion inner peripheral surface 50A of the cylindrical portion 221A has the second inner peripheral surface 52A that is a tapered portion. In addition, a curved surface shape in which the angle gradually changes between the first inner peripheral surface 51A and the second inner peripheral surface 52A or around the inner connection portion 42A may be employed.

  FIG. 5 is a diagram illustrating an example of an optical path (optical path LC) in the illumination unit 10C in which the inner cylindrical surface 50C of the cylindrical unit 221C does not have a tapered portion. FIG. 6 is a diagram illustrating an example of an optical path (optical paths LA1 and LA2) in the illumination unit 10A according to the first embodiment having the second inner peripheral surface 52A in which the cylindrical inner peripheral surface 50A of the cylindrical portion 221A is a tapered portion. .

  As illustrated in FIG. 5, if the inner circumferential surface 50 </ b> C of the cylindrical portion 221 </ b> C does not have a tapered portion, the cylindrical portion 221 </ b> C and the lens portion 222 </ b> C are connected in the vicinity of the cylindrical portion, like the optical path LC. Light that enters the inner peripheral surface of the lens portion 221C but is emitted from the surface of the lens portion 222C instead of the outer peripheral surface of the cylindrical portion 221C may occur. Such light appears as unintended light such as a ring-shaped contour on the irradiation surface because the designed light distribution control is not performed. In this case, there is a problem that the light distribution performance is reduced.

  On the other hand, as shown in FIG. 6, the illumination unit 10A has a second inner peripheral surface 52A in which the cylindrical inner peripheral surface 50A of the cylindrical portion 221A is a tapered portion. The second angle θ2 in the tapered portion is defined as an angle that guides light incident near a portion where the cylindrical portion 221A and the lens portion 222A are connected to either the reflection plate 23A or the lens portion 222A. For this reason, the light emitted from the light source 21A and incident on the vicinity of the portion where the cylindrical portion 221A and the lens portion 222A are connected is controlled by either the lens portion 222A or the reflecting plate 23A, so that a ring is formed on the irradiation surface It does not appear as unintended light such as a contour.

  FIG. 6 illustrates an example of the light controlled as described above (optical paths LA1 and LA2). In the optical path LA1, light (light LA1a) emitted from the light source 21A enters the second inner peripheral surface 52 and is refracted (light LA1b), emitted from the surface of the cylindrical portion 221A (light LA1c), and reflected by the reflecting plate 23A. The light path is reflected (light LA1d) and travels toward the irradiation surface. In the optical path LA2, light (light LA2a) emitted from the light source 21A is incident on the second inner peripheral surface 52 and refracted (light LA2b), emitted from the surface of the lens portion 222A (light LA2c), and irradiated. The optical path toward the surface is shown. As described above, in the lighting unit 10A, it is possible to suppress a decrease in light distribution performance.

  In the optical member 22A, the first angle is 18 ° and the second angle is 15 °. It is preferable that the second angle is not less than 10 ° and not more than 20 °. In this case, in particular, since the light incident on the second inner peripheral surface 52A from the light source 21A is sufficiently controlled, the deterioration of the light distribution performance can be suppressed.

  Further, as shown in FIG. 4, a rear connection portion 43A which is a boundary portion between the inner peripheral surface 50A of the cylindrical portion of the cylindrical portion 221A and the rear surface of the annular portion 223A has a curved shape in a cross section passing through the central axis 9. .

  FIG. 7 is a diagram illustrating an example of an optical path (optical path LD) in the illumination unit 10D in which the cross-sectional shape of the rear connection unit 43D is not curved but angular. FIG. 8 is a diagram illustrating an example of an optical path (optical path LA3) in the illumination unit 10A of the first embodiment in which the cross-sectional shape of the rear connection unit 43A is curved.

  As illustrated in FIG. 7, when the cross-sectional shape of the rear connection portion 43D is an angular shape, light incident from the light source 21D to the vicinity of the rear connection portion 43D is reflected backward like the optical path LD. Cheap. Therefore, the lighting efficiency is reduced.

  On the other hand, as shown in FIG. 8, when the cross-sectional shape of the rear connection portion 43A is curved, light reflected from the light source 21A to the vicinity of the rear connection portion 43A is not reflected as in the optical path LA3. Then, the ratio of the light refracted in the optical member 22A and traveling toward the reflection plate 23A increases. Therefore, lighting efficiency is improved.

  At this time, if the radius of curvature of the rear connection portion 43A is too small, reflection occurs as in the example of FIG. On the other hand, if the radius of curvature of the rear connection portion 43A is too large, light that has entered near the rear connection portion 43A will be directed forward from the reflector 23A. Therefore, in the cross section passing through the central axis 9, the radius of curvature of the rear connection portion 43A is preferably 1.5 mm or more and 2 mm or less. The radius of curvature of the rear connection portion 43A may be, for example, about 1.8 mm.

<3. Second Embodiment>
Subsequently, the structure of the lighting unit 10B of the lighting device according to the second embodiment will be described. FIG. 9 is a cross-sectional view of the lighting unit 10B of the lighting device according to the second embodiment. In FIG. 9, illustration of the facet reflector provided on the inner peripheral surface 30B of the reflection plate 23B is omitted. As shown in FIG. 9, the illumination unit 10B includes a light source 21B, an optical member 22B, a reflector 23B, and a baffle 24B. The basic configuration of each of the units 21B to 24B of the illumination unit 10B is the same as that of each of the units 21 to 24 of the illumination unit 10 described above. Here, the characteristic portion of the lighting section 10B will be described with reference to FIG.

  As shown in FIG. 9, in a cross section including the central axis 9B, a straight line connecting the radial one end 211B of the light emitting region of the light source 21B and the radial other end 232B of the reflector opening 230B is a first straight line L11B. A straight line connecting the other radial end 212B of the light emitting area of the light source 21B and the radial one end 231B of the reflector opening 230B is referred to as a first straight line L12B. In addition, a straight line connecting one radial end portion 211B of the light emitting region of the light source 21B and one radial end portion 241B of the baffle opening 240B is a second straight line L21B, and the other radial end 212B of the light emitting region of the light source 21B is connected to the second straight line L21B. A straight line connecting the other end 242B in the radial direction of the baffle opening 240B is referred to as a second straight line L22B. The intersection of the first straight line L11B and the second straight line L22B is called an intersection C1B, and the intersection of the first straight line L12B and the second straight line L21B is called an intersection C2B.

  In the optical member 22B, the inner connecting portion 42B, which is a boundary portion between the inner peripheral surface of the cylindrical portion 221B and the rear surface of the lens portion 222B, is disposed on the first straight lines L11B, L12B in a cross section passing through the central axis 9B. Accordingly, light emitted from the light source 21B toward the inner peripheral surface 30B of the reflector 23B hits the cylindrical portion 221B instead of the lens portion 222B. That is, of the light emitted from the light source 21B, the ratio of the light traveling toward the reflection plate 23B can be increased. Compared with the lens part 222B, the reflection plate 23B can concentrate the light from the light source 21B to the center, so that the light distribution can be concentrated at the center. That is, the axial luminous intensity can be improved.

  Thus, light emitted from the light source 21B toward the inner peripheral surface of the baffle 24B and the baffle opening 240B ahead of the reflector 23B is incident on the lens 222B. Therefore, the light traveling toward the inner peripheral surface of the baffle 24B and the baffle opening 240B can be reduced, and the proportion of the light traveling toward the reflector 23B and the lens portion 222B can be increased. Therefore, lighting efficiency and light distribution performance are improved.

  The design light distribution angle of the reflector 23B is 6 ° or more and 18 ° or less. As described above, when the light distribution angle of the reflecting plate 23B is a relatively small light distribution angle such as a narrow angle or a medium angle, it is particularly useful to concentrate the light distribution in this manner.

  If the inner connecting portion 42B is disposed radially inside the first straight lines L11B and L12B, part of the light traveling from the light source 21B toward the inner peripheral surface of the baffle 24B does not enter the lens portion 222B, and the cylindrical portion does not. 221B to the inner peripheral surface of the baffle 24B. In that case, lighting efficiency and light distribution performance are reduced. Therefore, the inner connection portion 42B may be arranged near the first straight lines L11B and L12B and radially outside the first straight lines L11B and L12B. In this case, even if there is a dimensional error in manufacturing, the light emitted from the light source 21B can be directed as much as possible to the lens portion 222B and the inner peripheral surface 30B of the reflector 23B.

  Further, the inner connection portion 42B is disposed on the intersections C1B and C2B in a cross section passing through the central axis 9B. As a result, of the light emitted from the light source 21B, the light that has passed through the cylindrical portion 221B hits one of the inner peripheral surface 30B of the reflecting plate 23B and the inner peripheral surface of the baffle 24B. Accordingly, light emitted from the light source 21B and passing through the cylindrical portion 221B is not directly irradiated to the outside of the lighting device. That is, a glareless lighting device can be obtained.

  When the inner connection portion 42B is arranged radially inside the intersections C1B and C2B, a part of the light emitted from the light source 21B and passing through the cylindrical portion 221B does not hit the reflection plate 23B and the baffle 24B. , And is radiated directly to the outside of the lighting device. Therefore, the inner connection portion 42B may be arranged near the intersections C1B and C2B and radially outside the intersections C1B and C2B. In this case, even when there is a dimensional error in manufacturing, the light emitted from the light source 21B and passed through the cylindrical portion 221B is prevented from being directly irradiated to the outside of the lighting device.

<4. Modification>
As described above, the main embodiment of the present invention has been described, but the present invention is not limited to the above embodiment.

  In the above embodiment, the illumination device has the optical member provided with the lens unit, but the present invention is not limited to this. Light emitted from the light source may be incident on the reflection plate without passing through the optical member.

  Further, in the above embodiment, the lighting device is rotatably fixed to the ceiling, but the present invention is not limited to this. The lighting device of the present invention may be fixed so as not to rotate with respect to the ceiling, or may be fixed to a structure other than the ceiling such as a wall. Further, in the lighting device of the present invention, the main body may be fixed to a stand.

  In the above embodiment, the LED light source, which is a light source, is disposed behind the rear end of the reflection plate, but may be disposed inside a space surrounded by the reflection plate.

  Further, in the above embodiment, a COB type LED light source is used as a light source, but the present invention is not limited to this, and for example, one or several SMD (Surface Mount Device) type LEDs of several mm square are used. You may. When several SMD type LEDs are used, the end of the light emitting area farthest from the center axis of the LED installed on the outermost side is referred to as “one end in the radial direction” and “the other end in the radial direction”. I just need.

  Further, in the above-described embodiment, the cross section of the cylindrical portion of the optical member including the optical axis has a straight line or one kind of gentle curve, but has a plurality of kinds of curves having different inclinations. It may be that. In the case where the cross section of the cylindrical portion of the optical member is a straight line or one kind of gentle curve having a plane including the optical axis, light incident on the cylindrical portion may be totally reflected and fly in an unexpected direction. possible. By making the cross-sectional shape of the cylindrical portion a straight line or one kind of gentle curve, it is possible to control so that light incident on the cylindrical portion is reflected downward without being totally reflected in an unexpected direction. it can.

  In addition, the elements appearing in each of the above embodiments and modifications may be arbitrarily combined as long as no inconsistency occurs.

<5. Extraction of Invention>
The inventions extracted from the above embodiments and modifications include, for example, the following inventions.

  A first invention provides a light source, a reflector having a dome-shaped inner peripheral surface that increases in diameter from a rear end portion located near a light emitting area of the light source toward an opening at a front end portion, and at least a part of the reflector is provided. An optical member arranged on the front side of the light source, and at least a part thereof is arranged inside the reflection plate, wherein the optical member has a cylindrical portion whose diameter decreases toward the front side, A lens portion that covers the front side, and an inner connection portion that is a boundary portion between an inner peripheral surface of the cylindrical portion and a rear surface of the lens portion has a light emitting area of the light source in a cross section passing through an optical axis of the light source. The illumination is arranged on a first straight line connecting one end in the radial direction and the other end in the radial direction of the opening, or in the vicinity of the first straight line and radially outside the first straight line. Device.

  A second invention is the lighting device according to the first invention, further comprising a cylindrical baffle disposed on a front side of the reflection plate, wherein the inner connection portion has a cross section passing through the optical axis, and On the intersection of the second straight line connecting the other end in the radial direction of the light emitting region and the front end and the other end in the radial direction of the baffle with the first straight line, or near the intersection and having a diameter larger than the intersection. It is arranged outside in the direction.

  A third invention is the lighting device according to the first invention or the second invention, wherein a design light distribution angle of the reflector is 6 ° or more and 18 ° or less.

  According to a fourth aspect of the present invention, there is provided a light source, a reflector having a dome-shaped inner peripheral surface which increases in diameter from a rear end disposed near the light source toward an opening of the front end, and is disposed in front of the reflector. A cylindrical baffle, an optical member at least partially disposed on the front side of the light source, and at least a part disposed radially inward of the reflection plate; and the optical member contracts toward the front side. A cylindrical portion having a diameter, and a lens portion that covers the front side of the cylindrical portion, and an outer connecting portion that is a boundary portion between an outer peripheral surface of the cylindrical portion and a front surface of the lens portion has an optical axis of the light source. A first straight line connecting a radial one end of the light emitting area of the light source and a radial other end of the opening, and a radial other end of the light emitting area of the light source and a front side of the baffle. And on the intersection with the second straight line connecting the other end in the radial direction, The intersection is located radially outwardly of a vicinity of said intersection, is a lighting device.

  A fifth invention is the lighting device according to the fourth invention, wherein a design light distribution angle of the reflector is 25 ° or more and 50 ° or less.

  According to a sixth aspect of the present invention, there is provided a light source, a reflector having a dome-shaped inner peripheral surface which increases in diameter from a rear end disposed near the light source toward an opening at the front end, and is disposed in front of the reflector. A cylindrical baffle, an optical member at least partially disposed on the front side of the light source, and at least a part disposed radially inward of the reflection plate; and the optical member contracts toward the front side. A cylindrical portion having a diameter, and a lens portion covering a front side of the cylindrical portion, wherein an inner peripheral surface of the cylindrical portion has a first inner peripheral surface at an angle with respect to a center axis of the cylindrical portion being a first angle. Disposed between an inner connecting portion, which is a boundary portion between an inner peripheral surface of the cylindrical portion and a rear surface of the lens portion, and the first inner peripheral surface, and an angle with respect to the central axis is larger than the first angle. And a second inner peripheral surface at a second angle.

  A seventh invention is the lighting device according to the sixth invention, wherein the second angle is not less than 10 ° and not more than 20 °.

  According to an eighth aspect of the present invention, there is provided a light source, a reflector having a dome-shaped inner peripheral surface which increases in diameter from a rear end to an opening at a front end disposed near the light source; And an optical member at least a part of which is arranged radially inward of the reflection plate, the optical member has a cylindrical portion whose diameter decreases toward the front side, and a lens portion that covers the front side of the cylindrical portion. And a plate-shaped and annular plate portion whose inner edge is connected to the rear end of the cylindrical portion and is arranged substantially perpendicular to the optical axis of the light source on the front side of the light source, The rear connection portion, which is a boundary portion between the inner peripheral surface of the first portion and the rear surface of the plate portion, is a lighting device that has a curved shape in a cross section passing through the optical axis.

  A ninth invention is the lighting device according to the eighth invention, wherein a radius of curvature of a section of the rear connection portion passing through the optical axis is not less than 1.5 mm and not more than 2 mm.

  According to the first to seventh inventions, an illumination device that can obtain a desired light distribution can be obtained.

  In particular, according to the first aspect, of the light emitted from the light source, it is possible to increase the ratio of light going to the reflector. As a result, the light distribution can be concentrated more centrally. That is, the axial luminous intensity can be improved. In addition, of the light emitted from the light source, the ratio of light traveling toward the lens unit and the reflection plate can be increased. Therefore, lighting efficiency and light distribution performance are improved.

  In particular, according to the second aspect, the light that has passed through the cylindrical portion is not directly irradiated to the outside of the lighting device. That is, a glareless lighting device can be obtained.

  In particular, according to the fourth aspect, of the light emitted from the light source and passing through the cylindrical portion, the ratio of light traveling toward the reflection plate can be improved. Thereby, illumination efficiency and light distribution performance can be improved.

  In particular, according to the sixth aspect, it is suppressed that the light incident from the light source in the vicinity of the front end of the inner peripheral surface of the cylindrical portion is directed in an unexpected direction. As a result, it is possible to suppress a decrease in light distribution performance.

  In particular, according to the eighth aspect, the light that has entered the vicinity of the rear connection portion from the light source is prevented from being reflected backward. Therefore, lighting efficiency is improved.

Reference Signs List 1 lighting device 9, 9A, 9B central axis 10, 10A, 10B, 10C, 10D lighting unit 21, 21A, 21B, 21C, 21D light source 22, 22A, 22B optical member 23, 23A, 23B reflector 24, 24A, 24B Baffle 30, 30A, 30B Inner peripheral surface 41A Outer connecting portion 42A, 42B Inner connecting portion 43A, 43D Rear connecting portion 50A, 50C Tube inner peripheral surface 51A First inner peripheral surface 52A Second inner peripheral surface 221, 221A, 221B , 221C cylindrical part 222, 222A, 222B, 222C lens part 223, 223A annular part 224 base part 230, 230A, 230B reflector opening 240, 240A, 240B baffle opening C1A, C1B intersection C2A, C2B intersection L11A, L12A, L11B , L12B, the first straight line L21A, L22A, L21B, L22B 2nd straight line

Claims (4)

A COB type light source having a light emitting region,
A reflector having a dome-shaped inner peripheral surface whose diameter increases from a rear end portion to a front end portion arranged near the light source,
A cylindrical baffle arranged on the front side of the reflection plate and having a baffle opening on the front side,
An optical member at least partially disposed on the front side of the light source, and at least part disposed radially inward of the reflector.
Has,
The optical member,
A tube portion whose diameter decreases toward the front side,
A lens portion that covers the front side of the cylindrical portion,
Has,
An outer connecting portion, which is a boundary portion between the outer peripheral surface of the cylindrical portion and the front surface of the lens portion, has a cross section passing through the optical axis of the light source, and has a radial other end of a light emitting region of the light source and the baffle opening. An illuminating device arranged on a second straight line connecting ends on the other side in the radial direction or radially outside the second straight line. The lighting device according to claim 1,
The lighting device, wherein a design light distribution angle of the reflector is 25 ° or more and 50 ° or less. A COB type light source having a light emitting region,
A reflector having a dome-shaped inner peripheral surface whose diameter increases from a rear end portion to a front end portion arranged near the light source,
An optical member at least partially disposed on the front side of the light source, and at least part disposed radially inward of the reflector.
Has,
The optical member,
A tube portion whose diameter decreases toward the front side,
A lens portion that covers the front side of the cylindrical portion,
Has,
The inner peripheral surface of the cylindrical portion,
A first inner peripheral surface having an angle with respect to a center axis of the cylindrical portion being a first angle;
The light source is disposed between an inner connection portion, which is a boundary portion between an inner peripheral surface of the cylindrical portion and a rear surface of the lens portion, and the first inner peripheral surface, and an angle with respect to the central axis is larger than the first angle. A second inner peripheral surface, which is a second angle that guides light incident from the lens to the reflection plate or the lens portion,
A lighting device, including: The lighting device according to claim 3,
The lighting device, wherein the second angle is not less than 10 ° and not more than 20 °.

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