JP2018060742A - Wall washer type lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently radiate light to an irradiation object such as a wall surface and prevent such a state as occurrence of glare.SOLUTION: A wall washer type lighting device 10 includes: a light source 12; and a lens 14 for controlling light emitted by the light source 12. The lens 14 includes: an incidence plane 14a formed at a flat surface; and an emission surface 14b formed at a toroidal surface having different curvature radii depending on an X-axis direction and a Y-axis direction that are orthogonal to each other. The light source 12 and the lens 14 are arranged so that a light axis Ax of the light source 12 and a center C of the toroidal surface are eccentrically positioned.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device, and more particularly to a wall washer type lighting device that illuminates a wall surface or the like.

  2. Description of the Related Art Conventionally, a wall washer type lighting device designed to uniformly illuminate a wall surface or the like is known (see, for example, Patent Document 1).

JP 2011-40299 A

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a wall washer-type illumination device capable of efficiently irradiating light to an irradiation object such as a wall surface and preventing occurrence of glare. Is to provide.

  In order to solve the above-described problem, a wall washer type illumination device according to an aspect of the present invention includes a light source that emits narrow-angle spot light and a lens that controls the spot light emitted from the light source. The lens includes an incident surface formed on a flat surface and an output surface formed on a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other. The light source and the lens are arranged so that the optical axis of the light source is shifted from the center of the toroidal surface.

  Another embodiment of the present invention is also a wall washer type lighting device. The wall washer illumination device includes a light source that emits narrow-angle spot light and a lens that controls spot light emitted from the light source. The lens includes an incident surface formed on a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, and an output surface formed on a plane. The light source and the lens are arranged so that the optical axis of the light source is shifted from the center of the toroidal surface.

  The optical axis of the light source may be parallel to the Z axis orthogonal to the X axis and the Y axis.

  The optical axis of the light source may be shifted from the center of the toroidal surface by a predetermined distance in the X-axis direction or the Y-axis direction.

  The toroidal surface may be formed in a plurality of stages in the form of a Fresnel lens.

  The irradiation angle of the spot light emitted from the light source may be 20 degrees or less.

  Another embodiment of the present invention is also a wall washer type lighting device. The wall washer illumination device includes a light source that emits narrow-angle spot light and a lens that controls spot light emitted from the light source. The lens has an incident surface on which light from the light source is incident and an output surface on which light is emitted. The incident surface is formed in a plane. The exit surface has a toroidal surface with different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, a curvature in one of the X-axis direction and the Y-axis direction, and a curvature in the other of the X-axis direction and the Y-axis direction. It is formed on a surface combined with a cylindrical surface that does not have.

  Another embodiment of the present invention is also a wall washer type lighting device. The wall washer illumination device includes a light source that emits narrow-angle spot light and a lens that controls spot light emitted from the light source. The lens has an incident surface on which light from the light source is incident and an output surface on which light is emitted. The incident surface has a toroidal surface with different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, a curvature in one of the X-axis direction and the Y-axis direction, and a curvature in the other of the X-axis direction and the Y-axis direction. It is formed on a surface combined with a cylindrical surface that does not have. The emission surface is formed as a flat surface.

  Another embodiment of the present invention is also a wall washer type lighting device. The wall washer illumination device includes a light source that emits narrow-angle spot light and a lens that controls spot light emitted from the light source. The lens has an incident surface on which light from the light source is incident and an output surface on which light is emitted. The incident surface is formed in a plane. The exit surface is formed by combining a first toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other and a second toroidal surface having a curvature radius different from the first toroidal surface.

  Another embodiment of the present invention is also a wall washer type lighting device. The wall washer illumination device includes a light source that emits narrow-angle spot light and a lens that controls spot light emitted from the light source. The lens has an incident surface on which light from the light source is incident and an output surface on which light is emitted. The incident surface is formed by combining a first toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other and a second toroidal surface having a curvature radius different from the first toroidal surface. The emission surface is formed as a flat surface.

  It should be noted that any combination of the above-described constituent elements and a representation obtained by converting the expression of the present invention between apparatuses, methods, systems, and the like are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, while irradiating light efficiently to irradiation objects, such as a wall surface, the wall washer type illuminating device which can prevent the situation where a glare arises can be provided.

It is a perspective view of the wall washer type illuminating device which concerns on embodiment of this invention. It is a top view of the wall washer type illuminating device which concerns on embodiment of this invention. It is a side view of the wall washer type illuminating device which concerns on embodiment of this invention. It is sectional drawing which shows an example of a light source. Fig.5 (a)-FIG.5 (c) are figures which show the result of an optical simulation. FIG. 6A to FIG. 6C are diagrams for explaining the light distribution of the wall washer type illumination device according to the embodiment of the present invention. It is a figure for demonstrating the shift | offset | difference direction of the optical axis of a light source with respect to the center of the toroidal surface of a lens. FIG. 8A to FIG. 8F are diagrams showing optical simulation results when the optical axis of the light source is shifted in the directions D1 to D3 shown in FIG. It is a perspective view of the wall washer type illuminating device which concerns on another embodiment of this invention. It is a disassembled perspective view of the wall washer type illuminating device which concerns on another embodiment of this invention. It is a figure for demonstrating the formation method of the lens in the wall washer type illuminating device which concerns on another embodiment of this invention. FIG. 12A to FIG. 12D are diagrams showing an example of a lens used in a wall washer type illumination device. FIG. 13A to FIG. 13D are diagrams showing optical simulation results of the wall washer type illumination device using the lens shown in FIG. FIG. 14A to FIG. 14D are diagrams showing another embodiment of the lens used in the wall washer type illumination device. FIG. 15A to FIG. 15D are diagrams showing optical simulation results of the wall washer type illumination device using the lens shown in FIG. It is a figure which shows the modification of the lens used with a wall washer type illuminating device. It is a side view of the wall washer type illuminating device which concerns on another embodiment of this invention. It is a figure for demonstrating the wall washer type illuminating device which concerns on another embodiment of this invention. It is a perspective view which shows the lens which has the output surface which combined the toroidal surface and the cylindrical surface. It is a figure which shows the modification of a lens provided with the toroidal surface and the output surface which combined the surface different from this toroidal surface.

  FIG. 1 is a perspective view of a wall washer illumination device 10 according to an embodiment of the present invention. FIG. 2 is a plan view of the wall washer-type lighting device 10 according to the embodiment of the present invention. FIG. 3 is a side view of the wall washer-type lighting device 10 according to the embodiment of the present invention.

  The wall washer type illumination device 10 can be used mainly for wall washer illumination. Wall washer illumination is generally performed as an indirect illumination method, and is an illumination method that uniformly irradiates light on the entire wall surface as if it was washed away with water. The wall washer illumination device 10 according to the present embodiment includes a light source 12 and a lens 14 that controls light emitted from the light source 12.

  As the light source 12, a light source that irradiates a circular spot light that travels substantially straight at a narrow angle is used. FIG. 4 is a cross-sectional view showing an example of the light source 12. The light source 12 shown in FIG. 4 includes an LED 40 as a light emitting unit, an LED mounting unit 41 on which the LED 40 is mounted, a reflecting mirror 42, a glass cover 43, and a housing 44 that houses the LED 40, the reflecting mirror 42, and the like. . Of course, the light source 12 is not limited to that shown in FIG.

  In the light source 12, the LED 40 may emit white light. The LED 40 may include a blue LED chip and a yellow light emitter. By using the blue light emitted from the blue LED chip and exciting the yellow phosphor with a part of it, white light can be created by mixing blue light and yellow light.

  The reflecting mirror 42 may have a parabolic reflecting surface. As shown by the light beam L1 in FIG. 4, the reflecting mirror 42 reflects the light emitted from the LED 40. The light reflected by the reflecting mirror 42 is emitted to the outside of the housing 44 through the glass cover 43, and a narrow-angle circular spot light is formed in front of the light source 12. The irradiation angle of the circular spot light emitted from the light source 12 is 20 degrees or less (for example, 5 degrees). This circular spot light is substantially parallel to the optical axis Ax of the light source 12.

  As shown in FIG. 4, the LED 40 may be disposed at a position shifted from the focal point F of the paraboloid. The amount of deviation from the focal point F may be, for example, ± 0.2 mm to 0.3 mm. When the LED 40 is disposed at the focal point F of the paraboloid of revolution, the light reflected by the reflecting mirror 42 becomes completely parallel light, so that the image of the LED 40 may be reflected on the spot light irradiation surface. By disposing the LED 40 at a position shifted from the focal point F of the paraboloid of revolution, the parallel light can be disturbed, so that the image of the LED 40 can be prevented from being reflected on the spot light irradiation surface, and a clean irradiation surface is formed. be able to.

  Returning to FIGS. 1 to 3, the lens 14 is disposed in front of the light source 12 (irradiation direction). The lens 14 controls the circular spot light from the light source 12 to form a light distribution suitable for wall washer illumination. The lens 14 may be formed of a transparent material such as glass, acrylic, or polycarbonate.

  The lens 14 has an incident surface 14a on which light from the light source 12 is incident and an output surface 14b that emits light. The incident surface 14a is formed in a plane. The emission surface 14b is formed on a toroidal surface. The toroidal surface is a surface having different radii of curvature in two directions orthogonal to each other. That is, when the X axis and the Y axis that are orthogonal to each other are defined as shown in FIG. 1, the curvature radius Rx in the X axis direction and the curvature radius Ry in the Y axis direction are different. As shown in FIG. 2, the outer dimension “a” of the lens 14 may be larger than the outer dimension “b” of the light source 12. Preferably, the outer dimension “a” of the lens 14 may be at least twice the outer dimension “b” of the light source 12.

  In the wall washer type illumination device 10 according to the present embodiment, the exit surface 14b of the lens 14 is a toroidal surface, so that a slender image (light distribution) is created from a circular spot light and a beautiful image with little distortion is obtained. Because. Since the toroidal surface has different radii of curvature in two orthogonal directions, image distortion correction is easy. Although a cylindrical lens having a curvature only in one direction can form a long and narrow image, it is difficult to correct image distortion.

  Here, in the wall washer type illumination device 10 according to the present embodiment, the light source 12 and the lens 14 are arranged so that the optical axis Ax of the light source 12 and the center C of the toroidal surface (intersection of the X axis and the Y axis) are shifted. Is done. The optical axis Ax of the light source 12 is parallel to the Z axis orthogonal to the X axis and the Y axis.

  Next, the light distribution formed by the wall washer type illumination device 10 according to the present embodiment will be described.

  First, the light distribution of the illumination device according to the comparative example will be described with reference to FIGS. In this comparative example, the optical axis Ax of the light source 12 is arranged so as to pass through the center C of the toroidal surface. Fig.5 (a)-FIG.5 (c) show the result of an optical simulation. FIG. 5A shows the result of ray tracing simulation in plan view. FIG. 5B shows a ray tracing simulation result in perspective. FIG. 5C shows an illumination distribution simulation result in plan view.

  5A and 5B illustrate the lens 14 and the reflecting mirror 42 of the light source 12. A line extending from the reflecting mirror 42 is a light beam irradiated (reflected) from the reflecting mirror 42. In this case, as shown in FIG. 5C, it can be seen that an image of the spot light is formed symmetrically with respect to the X axis and the Y axis.

  Next, with reference to FIG. 6A to FIG. 6C, the light distribution of the wall washer type illumination device 10 according to the present embodiment will be described. Similar to FIGS. 5A to 5C, FIGS. 6A to 6C also show the results of the optical simulation. FIG. 6A shows a result of ray tracing simulation in plan view. FIG. 6B shows a ray tracing simulation result in perspective. FIG. 6C shows an illumination distribution simulation result in plan view.

  As shown in FIG. 6A, in this simulation, the center of the light source 12 is shifted in the Y-axis direction with respect to the center of the toroidal surface of the lens 14. As a result, it can be seen from FIG. 6A that many light rays are traveling in the Y-axis direction. Further, from FIGS. 6B and 6C, it can be seen that the inclination of the light beam changes and the light distribution is inclined in the Y-axis direction. This is because the curvature of the toroidal surface is asymmetric in the Y-axis direction. On the other hand, as shown in FIG. 6C, it can be seen that the light distribution does not change in the X-axis direction. This is because the curvature of the toroidal surface always maintains symmetry in the X-axis direction.

  As described above, according to the wall washer type illumination device 10 according to the present embodiment, the light distribution is inclined, that is, the uneven light distribution is realized by shifting the optical axis Ax of the light source 12 and the center C of the toroidal surface. can do. Thereby, wall washer illumination can be suitably performed without tilting the wall washer type illumination device 10 itself. In the wall washer type illumination device 10 according to the present embodiment, since the uneven light distribution is realized, the light irradiated to the opposite side of the irradiation object such as the wall surface is suppressed, and therefore the wall washer illumination can be performed efficiently. It is possible to prevent glare from occurring. In the above description, it has been described that the outer dimension “a” of the lens 14 is larger than the outer dimension “b” of the light source 12. This is based on the fact that the optical axis Ax of the light source 12 is shifted from the center C of the toroidal surface in this way.

  FIG. 7 is a diagram for explaining the direction of deviation of the optical axis of the light source with respect to the center of the toroidal surface of the lens. Here, when the optical axis of the light source is shifted from the center of the toroidal surface by a predetermined distance in the X-axis direction (direction D1 in FIG. 7), the optical axis of the light source is in the Y-axis direction (direction D2 in FIG. 7) from the center of the toroidal surface. ) And the case where the optical axis of the light source is shifted from the center of the toroidal surface in the intermediate direction between the X axis and the Y axis (direction D3 in FIG. 7).

  FIGS. 8A to 8F show optical simulation results when the optical axis of the light source is shifted in the directions D1 to D3 shown in FIG.

  FIG. 8A shows a ray tracing simulation result when the optical axis of the light source is shifted by a predetermined distance in the direction D1 (X-axis direction) in FIG. 7, and FIG. 8B shows an illuminance distribution simulation result. In this case, it can be seen that the spot light image (light distribution) is inclined in the X-axis direction.

  FIG. 8C shows a ray tracing simulation result when the optical axis of the light source is shifted by a predetermined distance in the direction D2 (Y-axis direction) in FIG. 7, and FIG. 8D shows an illuminance distribution simulation result. In this case, it can be seen that the spot light image (light distribution) is inclined in the Y-axis direction.

  FIG. 8E shows a result of ray tracing simulation when the optical axis of the light source is shifted by a predetermined distance in the direction D3 (intermediate direction between the X axis and the Y axis) in FIG. 7, and FIG. It is a simulation result. In this case, it can be seen that the spot light image (light distribution) is inclined in the direction between the X axis and the Y axis.

  In this way, by adjusting the direction and amount of deviation of the optical axis of the light source with respect to the center of the toroidal surface of the lens according to the required purpose and application, the inclination direction and inclination angle of the spot light image (light distribution) can be adjusted. Can be controlled. As long as the optical axis of the light source is moved on the same curvature line of the toroidal surface, the spot light image is not distorted.

  FIG. 9 is a perspective view of a wall washer illumination device 100 according to another embodiment of the present invention. FIG. 10 is an exploded perspective view of a wall washer illumination device 100 according to another embodiment of the present invention.

  As shown in FIGS. 9 and 10, the wall washer illumination device 100 includes a light source 112 and a lens 114 that controls light emitted from the light source 12. As the light source 112, a light source that irradiates a circular spot light that travels in a straight line with a narrow angle is used.

  FIG. 11 is a view for explaining a method of forming the lens 114 in the wall washer type illumination device 100 according to another embodiment of the present invention. The lens 114 is formed by trimming a part of the above-described lens 14 having a toroidal surface as an exit surface in accordance with the shape and dimensions of the light source 112. The portion to be trimmed is a portion shifted from the center C of the toroidal surface of the lens 14. By mounting the lens 114 thus trimmed on the light source 112, the wall washer type illumination device 100 is configured.

  FIGS. 12A to 12D show an embodiment of the lens 114 used in the wall washer type illumination device 100. FIG. As shown in FIG. 12A, a part of the lens 14 having a toroidal surface as the exit surface on the Y axis was trimmed to obtain a lens 114. FIG. 12B is a perspective view of the lens 114. FIG. 12C is a side view of the lens 114 viewed from the X-axis direction. FIG. 12D is a side view of the lens 114 viewed from the Y-axis direction. The wall washer type illumination device 100 using this lens 114 is suitable for illuminating a wall washer on a flat wall surface.

  FIGS. 13A to 13D show optical simulation results of the wall washer illumination device 100 using the lens 114 shown in FIG. FIG. 13A shows the result of ray tracing simulation when viewed from the front of the wall surface 130. FIG. 13B shows a ray tracing simulation result when the wall surface 130 is viewed from an oblique direction. FIG. 13C is an enlarged view of a main part of the ray tracing simulation result shown in FIG. FIG. 13D shows the illuminance distribution simulation result.

  In this case, as shown in FIGS. 13 (a) to 13 (d), the light distribution spreads in parallel to the wall surface 130, and the narrow light distribution unique to the spotlight is converted into a narrow light distribution suitable for wall washer illumination. can do. In addition, since no light rays are emitted in the opposite direction to the wall surface 130, it is possible to prevent a situation where glare occurs without reducing efficiency.

  FIG. 14A to FIG. 14D show another embodiment of the lens 114 used in the wall washer type illumination device 100. As shown in FIG. 14A, a part of the lens 14 having a toroidal surface as an exit surface on the X axis was trimmed to obtain a lens 114. FIG. 14B is a perspective view of the lens 114. FIG. 14C is a side view of the lens 114 viewed from the Y-axis direction. FIG. 14D is a side view of the lens 114 viewed from the X-axis direction. The wall washer type illumination device 100 using this lens 114 is suitable for illuminating a column with a wall washer.

  15A to 15D show optical simulation results of the wall washer illumination device 100 using the lens 114 shown in FIG. FIG. 15A shows the result of ray tracing simulation when viewed from the front of the column 150. FIG. 15B shows a ray tracing simulation result when the column 150 is viewed from an oblique direction. FIG. 15C is an enlarged view of the main part of the ray tracing simulation result shown in FIG. FIG. 15D shows the illuminance distribution simulation result.

  In this case, as shown in FIGS. 15A to 15D, the pillar 150 can be illuminated with a wall washer from the bottom while maintaining a narrow light distribution peculiar to the spotlight. In addition, since no light rays are emitted in the opposite direction to the pillar 150, it is possible to prevent the occurrence of glare without reducing efficiency.

  FIG. 16 shows a modification of the lens used in the wall washer type illumination device 100. A lens 160 shown on the left side of FIG. 16 is obtained by forming a lens 114 shown on the right side into a Fresnel lens. That is, the toroidal surface of the lens 160 is formed in a plurality of stages in the form of a Fresnel lens. By using a Fresnel lens in this way, the thickness of the lens can be reduced, and a compact wall washer illumination device can be realized.

  FIG. 17 is a side view of a wall washer-type lighting device 170 according to still another embodiment of the present invention. As shown in FIG. 17, the wall washer type illumination device 170 according to this embodiment includes a light source 12 that emits narrow-angle spot light and a lens 171 that controls light emitted from the light source 12.

  In the wall washer type illumination device 170 according to the present embodiment, the lens 171 includes an incident surface 171a formed on a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, and an emission surface formed on a plane. 171b. That is, the wall washer type illumination device 170 according to the present embodiment is one in which the entrance surface 14a and the exit surface 14b of the lens 14 in the wall washer type illumination device 10 shown in FIG. 3 are reversed. The light source 12 and the lens 171 are arranged so that the optical axis Ax of the light source 12 and the center C of the toroidal surface (intersection of the X axis and the Y axis) are shifted. The optical axis Ax of the light source 12 is parallel to the Z axis orthogonal to the X axis and the Y axis.

  Similar to the wall washer illumination device 10 shown in FIG. 3, even when the entrance surface 171a of the lens 14 is a toroidal surface and the exit surface 171b is a flat surface as in the wall washer illumination device 170 according to the present embodiment. Light distribution can be realized.

  FIG. 18 is a view for explaining a wall washer type illumination device 180 according to still another embodiment of the present invention. As shown in FIG. 18, the wall washer illuminating device 180 according to the present embodiment includes a light source 12 that emits narrow-angle spot light and a lens 181 that controls light emitted from the light source 12. The light source 12 includes an LED 40 as a light emitting unit, a reflecting mirror 42 that reflects light emitted from the LED 40, and a housing 44 that houses the reflecting mirror 42 and the like. The reflecting mirror 42 may have a parabolic reflecting surface.

  In the wall washer type illumination device 180 according to the present embodiment, the lens 181 includes an incident surface 181a formed on a flat surface, a toroidal surface, and an exit surface 181b obtained by combining a surface different from the toroidal surface. In the lens 181 shown in FIG. 18, a partial region (right region) 182 of the exit surface 181b is formed on a toroidal surface having different radii of curvature in the X-axis direction and the Y-axis direction. On the other hand, another partial region (left region) 183 of the emission surface 181b is formed on a cylindrical surface having a curvature in the Y-axis direction and no curvature in the X-axis direction.

  FIG. 19 is a perspective view showing a lens 181 having an exit surface in which a toroidal surface and a cylindrical surface are combined. As shown in FIG. 19, the entrance surface 181a of the lens 181 is formed in a plane. On the other hand, the exit surface 181b of the lens 181 has a region 182 formed on a toroidal surface having different radii of curvature in the X-axis direction and the Y-axis direction, and a cylindrical shape having no curvature in the X-axis direction and having a curvature in the Y-axis direction. And a region 183 formed on the surface.

  FIG. 18 shows a ray tracing simulation result. As shown in FIG. 18, the light beam emitted from the region 182 formed on the toroidal surface is relatively largely inclined in the X-axis direction. By such uneven light distribution, it is possible to appropriately irradiate the vicinity of the base of the irradiation object 184 such as a column or wall located on the right side of the wall washer-type lighting device 180. On the other hand, the light beam emitted from the region 183 formed on the cylindrical surface is slightly inclined in the X-axis direction. By such uneven light distribution, the upper part of the irradiation object 184 can be appropriately irradiated.

  As described above, according to the wall washer type illumination device 180 according to the present embodiment, by adopting the emission surface 181b in which the toroidal surface and the cylindrical surface are combined, it is uniform from the vicinity of the root of the irradiation object 184 to the upper portion. Can be realized. Moreover, according to this embodiment, since the light irradiated to the opposite side to the irradiation target object 184 is suppressed, wall washer illumination can be performed efficiently and the occurrence of glare can be prevented. In order to make the light distribution natural gradation, the ratio / ratio of the region 182 formed on the toroidal surface and the region 183 formed on the cylindrical surface is adjusted using the rendering and ray tracing functions of the optical simulator. Is desirable.

  Also in this embodiment, the incident surface and the reflecting surface may be reversed as in the embodiment described with reference to FIG. That is, the entrance surface of the lens is formed by combining a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction and a cylindrical surface having no curvature in the X-axis direction and having a curvature in the Y-axis direction. In addition, the exit surface of the lens may be formed as a flat surface.

  Moreover, in the said embodiment, although one toroidal surface and one cylindrical surface were combined, the combination of a toroidal surface and a cylindrical surface is not limited to this, Arbitrary combinations are possible. For example, a first toroidal surface, a cylindrical surface, and a second toroidal surface may be combined.

  FIG. 20 shows a modification of a lens having a toroidal surface and an exit surface in which a surface different from the toroidal surface is combined. Using the lens 200 according to this modification, a wall washer-type illumination device can be configured as in FIG.

  A lens 200 shown in FIG. 20 includes an incident surface 200a formed on a flat surface and an output surface 200b obtained by combining two different toroidal surfaces. That is, the exit surface 200b of the lens 200 includes a region (right region) 201 formed on the first toroidal surface and a region (left region) formed on the second toroidal surface having a different radius of curvature from the first toroidal surface. 202).

  Also in the lens 200 shown in FIG. 20, the light beam emitted from the region 201 formed on the first toroidal surface is relatively largely inclined in the X-axis direction, and the light beam emitted from the region 202 formed on the second toroidal surface By forming the first toroidal surface and the second toroidal surface so as to be slightly inclined in the X-axis direction, uniform illumination from near the root of the irradiation object to the upper portion can be realized.

  Also in this embodiment, the incident surface and the reflecting surface may be reversed. That is, the entrance surface of the lens may be formed as a surface combining the first toroidal surface and the second toroidal surface having a different radius of curvature from the first toroidal surface, and the exit surface of the lens may be formed as a flat surface. .

  Moreover, in the said embodiment, although one 1st toroidal surface and one 2nd toroidal surface were combined, the combination of a toroidal surface is not limited to this, Arbitrary combinations are possible.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements, and such modifications are also within the scope of the present invention.

  10, 100, 170, 180 Wall washer type illumination device, 12, 112 light source, 14, 114, 160, 171, 181, 200 lens, 40 LED, 41 LED mounting portion, 42 reflector, 43 glass cover, 44 housing , 130 wall surface, 150 pillars, 184 irradiation object.

Claims (10)

A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens includes an incident surface formed in a plane, and an exit surface formed in a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other,
The wall washer type illumination device, wherein the light source and the lens are arranged so that an optical axis of the light source and a center of the toroidal surface are shifted. A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens includes an incident surface formed on a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, and an output surface formed on a plane.
The wall washer type illumination device, wherein the light source and the lens are arranged so that an optical axis of the light source and a center of the toroidal surface are shifted.   The wall washer illumination device according to claim 1 or 2, wherein an optical axis of the light source is parallel to a Z axis orthogonal to the X axis and the Y axis.   4. The wall washer illumination device according to claim 1, wherein an optical axis of the light source is deviated from a center of the toroidal surface by a predetermined distance in an X-axis direction or a Y-axis direction.   The wall washer type lighting device according to any one of claims 1 to 4, wherein the toroidal surface is formed in a plurality of stages in a Fresnel lens shape.   6. The wall washer illumination device according to claim 1, wherein an irradiation angle of the spot light emitted from the light source is 20 degrees or less. A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens has an incident surface on which light from the light source is incident and an exit surface that emits light,
The incident surface is formed in a plane,
The exit surface has a curvature in one of the X-axis direction and the Y-axis direction and a curvature in the other of the X-axis direction and the Y-axis direction, and a toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction. A wall washer-type lighting device, characterized in that the wall washer-type lighting device is formed on a surface combined with a cylindrical surface that does not have a surface. A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens has an incident surface on which light from the light source is incident and an exit surface that emits light,
The entrance surface has a toroidal surface with different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, a curvature in one of the X-axis direction and the Y-axis direction, and a curvature in the other of the X-axis direction and the Y-axis direction. Formed on a surface combined with a cylindrical surface that does not have
The exit surface is formed in a flat surface. A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens has an incident surface on which light from the light source is incident and an exit surface that emits light,
The incident surface is formed in a plane,
The emission surface is formed by combining a first toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other and a second toroidal surface having a curvature radius different from the first toroidal surface. A wall washer-type lighting device. A light source that emits a narrow-angle spot light;
A lens for controlling spot light emitted from the light source;
A lighting device comprising:
The lens has an incident surface on which light from the light source is incident and an exit surface that emits light,
The incident surface is formed by combining a first toroidal surface having different curvature radii in the X-axis direction and the Y-axis direction orthogonal to each other, and a second toroidal surface having a curvature radius different from the first toroidal surface,
The exit surface is formed in a flat surface.