Optical apparatus

Abstract

An optical apparatus (1), which is configured to irradiate light from a ceiling (2) or a floor light source (3) to a wall surface (4), includes: a first reflecting surface (9) of a curved surface along a first ellipsoid (100) in which one focal point (101a) is aligned with a position of the light source (3); a second reflecting surface (10) of a curved surface along a second ellipsoid (200) having one focal point (201a) that is in common with the one focal point (101a) of the first ellipsoid (200); and a third reflecting surface (12) of a curved surface along a third ellipsoid (300) having one focal point (301a) that is in common with the other focal point (101b) of the first ellipsoid (100).rface along a third ellipsoid (300) having one focal point (301a) that is in common with the other focal point (101b) of the first ellipsoid (100). As a result, it is possible to efficiently illuminate the wall surface with suppressing lowering light use efficiency.

Description

optical equipment

[0001] The present invention relates to an optical instrument for a wall washer.

[0002] There is a lighting system called a wall washer, in which light from a light source on the ceiling or floor is projected onto a wall. As a lighting fixture for a wall washer, one that uses a reflector or a diffuser has been proposed (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2017-130366

[0004] When realizing a wall washer, it is ideal to direct light from the light source in the intended direction, minimizing the decrease in light utilization efficiency and efficiently illuminating the wall surface.

[0005] The present invention has been made in view of the above-mentioned points, and has as its object to suppress a decrease in light utilization efficiency and to efficiently illuminate a wall surface.

[0006] The optical device of the present invention is an optical device for illuminating a wall surface with light from a light source on a ceiling or floor, and is characterized by having a curved reflective surface that follows an ellipsoid with one of a pair of focal points aligned with the position of the light source, and a curved reflective surface that follows another ellipsoid with one of the pair of focal points being a common focal point with the ellipsoid.Furthermore, the optical device of the present invention is an optical device for illuminating a wall surface with light from a light source on a ceiling or floor, and is characterized by having a first reflective surface that follows a curved surface that follows a first ellipsoid with one focal point aligned with the position of the light source, a second reflective surface that follows a curved surface that follows a second ellipsoid with one focal point that is a common focal point with the one focal point of the first ellipsoid, and a third reflective surface that follows a curved surface that follows a third ellipsoid with one focal point that is a common focal point with the other focal point of the first ellipsoid.

[0007] According to the present invention, it is possible to suppress a decrease in light utilization efficiency and to efficiently illuminate a wall surface.

[0008] FIG. 1A is an external view (front view) of the optical device according to the first embodiment. FIG. 1B is an external view (left side view) of the optical device according to the first embodiment. FIG. 1C is an external view (bottom view) of the optical device according to the first embodiment. FIG. 1D is an external view (perspective view seen from below) of the optical device according to the first embodiment. FIG. 2 is a cross-sectional view of the optical device according to the first embodiment. FIG. 3A is a cross-sectional perspective view of the optical device according to the first embodiment. FIG. 3B is a cross-sectional perspective view of the optical device according to the first embodiment. FIG. 3C is a cross-sectional perspective view of the optical device according to the first embodiment. FIG. 3D is a cross-sectional perspective view of the optical device according to the first embodiment. FIG. 4A is a diagram for explaining light irradiated onto a wall surface in the first embodiment. FIG. 4B is a diagram for explaining light irradiated onto a wall surface in the first embodiment. FIG. 4C is a diagram for explaining light irradiated onto a wall surface in the first embodiment. FIG. 4D is a diagram for explaining light irradiated onto a wall surface in the first embodiment. Fig. 4E is a diagram for explaining light irradiated onto a wall surface in the first embodiment. Fig. 5 is a diagram for explaining light irradiated onto a wall surface in the first embodiment. Fig. 6 is a cross-sectional view of the optical device according to the second embodiment. Fig. 7A is a cross-sectional perspective view of the optical device according to the second embodiment. Fig. 7B is a cross-sectional perspective view of the optical device according to the second embodiment. Fig. 7C is a cross-sectional perspective view of the optical device according to the second embodiment. Fig. 7D is a cross-sectional perspective view of the optical device according to the second embodiment. Fig. 8 is a diagram for explaining light irradiated onto a wall surface in the second embodiment.

[0009] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. [First Embodiment] An optical device 1 according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1A is an external view (front view) of the optical device 1, FIG. 1B is an external view (left side view) of the optical device 1, FIG. 1C is an external view (bottom view) of the optical device 1, and FIG. 1D is an external view (perspective view seen from below) of the optical device 1. FIG. 2 is a cross-sectional view (cross-sectional view taken along line A-A in FIG. 1A) of the optical device 1. FIGS. 3A to 3D are cross-sectional perspective views of the optical device 1. The optical device 1 is a reflective lens for lighting to realize a wall washer using a lighting fixture (e.g., a light equipped with a COB (Chip On Board) LED) installed on a ceiling 2 as a light source 3. In this application, the direction of the ceiling is defined as the upward direction, and the up and down directions are defined. In addition, the surface of the optical device 1 facing the wall surface 4 is defined as the front.

[0010] The optical device 1 has a cylindrical portion 5 with a bottom and a protrusion 6 protruding downward from the underside of the bottom 5a of the cylindrical portion 5. As shown in FIGS. 2 and 3A to 3D, a convex portion 7 is provided in the center of the upper surface of the bottom 5a of the cylindrical portion 5, and a circular opening 8 is formed inside this convex portion 7. The protrusion 6 is provided within a 180° range on the rear side around the central axis S of the opening 8. As shown in FIG. 1A, in the front view, the protrusion 6 has a shape that gradually narrows downward and then widens halfway down. As shown in FIG. 1B, the front side of the protrusion 6 has a shape that bulges forward (toward the wall surface 4) as it extends downward. As shown in FIG. 1B, the rear side of the protrusion 6 has a shape that is hollowed out in an arc. A disc portion 6a is provided at the tip (lower end) of the protrusion 6. The disc portion 6a of the protrusion 6 is located directly below the opening 8 and has a larger diameter than the opening 8.

[0011] As shown in Fig. 2, the optical device 1 is attached to the ceiling 2 so that the light source 3 is disposed inside the cylindrical portion 5 and coaxially with the opening 8. The opening 8 has a diameter larger than that of the COB LED that is the light source 3.

[0012] The optical device 1 is formed with a first reflecting surface 9, a second reflecting surface (1) 10, a second reflecting surface (2) 11, and a third reflecting surface 12. The first reflecting surface 9 is formed on the inner circumferential surface of the convex portion 7 and on the protruding portion 6, and is arranged so as to face the wall surface 4. The first reflecting surface 9 is arranged within a 180° range on the rear side around the central axis S. The first reflecting surface 9 is formed of a curved surface that follows a virtual first ellipsoid 100. The first ellipsoid 100 has one focal point 101a aligned with the position of the light source 3. The position of the light source 3 is, for example, the theoretical convergence point of light. The first ellipsoid 100 is a spheroid obtained with the major axis as the rotation axis. The other focal point 101b of the first ellipsoid 100 is located farther from the light source 3 (lower position) than the one focal point 101a and closer to the wall surface 4. In this embodiment, the other focal point 101 b is located at a height approximately the same as the lower surface of the bottom portion 5 a of the cylindrical portion 5 .

[0013] The second reflecting surface (1) 10 is formed on the protrusion 6 and is arranged to face the wall surface 4. The second reflecting surface (1) 10 is arranged within a 180° range on the back side around the central axis S. The second reflecting surface (1) 10 is arranged adjacent to the first reflecting surface 9 at a position farther from the light source 3 than the first reflecting surface 9 (a position lower than the first reflecting surface 9). The second reflecting surface (1) 10 is formed by a curved surface that follows a virtual second ellipsoid 200. The second ellipsoid 200 has one focus 201a that is common to one focus 101a of the first ellipsoid 100. The second ellipsoid 200 has a different shape from the first ellipsoid 100, and has a shorter minor axis and a longer major axis than the first ellipsoid 100. The second ellipsoid 200 is a spheroid obtained with the major axis as the axis of rotation. The other focal point 201b of the second ellipsoid 200 is located at a position farther from the light source 3 (lower position) than the first focal point 201a and closer to the wall surface 4. In this embodiment, the other focal point 201b is located at a height position approximately the same as that of the disk portion 6a at the tip of the protrusion 6.

[0014] The second reflecting surface (2) 11 is formed on the inner peripheral surface of the convex portion 7 and is arranged so as to face in the opposite direction to the first reflecting surface 9 and the second reflecting surface (1) 10, i.e., in the opposite direction to the wall surface 4. The second reflecting surface (2) 11 is arranged within a range of 180° on the front side around the central axis S. The second reflecting surface (2) 11 is configured as a curved surface that follows the second ellipsoid 200. In this embodiment, the second reflecting surface (1) 10 corresponds to the second reflecting surface defined in the present invention, and the second reflecting surface (2) 11 corresponds to the other second reflecting surface defined in the present invention.

[0015] The third reflecting surface 12 is formed on the lower surface of the bottom 5a of the cylindrical portion 5 and is arranged so as to face in the opposite direction to the first reflecting surface 9 and the second reflecting surface (1) 10, i.e., in the opposite direction to the wall surface 4, and so as to be downward relative to the second reflecting surface (2) 11. The third reflecting surface 12 is arranged within a 180° range on the front side around the central axis S. The third reflecting surface 12 is also arranged adjacent to the second reflecting surface (2) 11 at a position farther from the light source 3 than the second reflecting surface (2) 11 (a position lower than the second reflecting surface (2) 11). The third reflecting surface 12 is formed by a curved surface that follows a virtual third ellipsoid 300. The third ellipsoid 300 has one focal point 301a that is common to the other focal point 101b of the first ellipsoid 100. The third ellipsoid 300 has a different shape from the first ellipsoid 100, and its minor axis and major axis are longer than those of the first ellipsoid 100. The third ellipsoid 300 is a spheroid obtained with its major axis as the axis of rotation. The other focal point 301b of the third ellipsoid 300 is located at a position farther from the light source 3 (lower position) than the first focal point 301a and closer to the wall surface 4. The other focal point 301b of the third ellipsoid 300 is located closer to the wall surface 4 than the center line S.

[0016] The other focal point 201b of the second ellipsoid 200 is located at a position farther from the light source 3 (lower position) and closer to the wall surface 4 than the other focal point 101b of the first ellipsoid 100. The other focal point 301b of the third ellipsoid 300 is located at a position farther from the light source 3 (lower position) and closer to the wall surface 4 than the other focal point 201b of the second ellipsoid 200.

[0017] There are no limitations on the material and manufacturing method of the optical device 1. For example, the optical device 1 is formed by a metal 3D printer using a metal material.

[0018] Next, the light irradiated onto the wall surface 4 will be described with reference to Figs. 4A to 4E and 5. Fig. 4A shows the optical path L of the light directly irradiated by the light source 3. １ The light from the light source 3 passes through the opening 8 and spreads out in a region R １ is irradiated.

[0019] FIG. 4B shows the optical path L of the irradiated light by the second reflecting surface (1) 10. ２ In an ellipse, light emitted from a focal point has the property of being reflected and then passing through the opposite focal point. The light from the light source 3 is reflected by the second reflecting surface (1) 10, passes through another focal point 201b of the second ellipsoid 200, and spreads out to reach the region R on the upper side of the wall surface 4. ２ is irradiated.

[0020] FIG. 4C shows the optical path L of the irradiated light by the first reflecting surface 9 and the third reflecting surface 12. ３ The light from the light source 3 is reflected by the lower region of the first reflecting surface 9, passes through another focal point 101b of the first ellipsoid 100, reaches the third reflecting surface 12, is reflected by the third reflecting surface 12, passes through another focal point 301b of the third ellipsoid 300, and spreads out from the upper part of the wall surface 4 to the central region R ３ is irradiated.

[0021] FIG. 4D shows the optical path L of the irradiated light by the first reflecting surface 9. ４ The light from the light source 3 is reflected by the upper region of the first reflecting surface 9, passes through another focal point 101b of the first ellipsoid 100, and spreads up and down to the upper region R of the wall surface 4. ４ As shown in FIG. 2, if the lower surface of the bottom 5a of the cylindrical portion 5 is made substantially flush with the ceiling 2, the uppermost region R of the wall surface 4 that contacts the ceiling 2 will be ４ can be illuminated.

[0022] FIG. 4E shows the optical path L of the irradiated light by the second reflecting surface (2) 11. ５The light from the light source 3 is reflected by the second reflecting surface (2) 11, passes through another focal point 201b of the second ellipsoid 200, and spreads to a region R ５ is irradiated.

[0023] 5 shows a combination of the irradiated light beams shown in FIGS. 4A to 4E. As shown in FIG. 5, a wall washer can be realized by irradiating light from the top to the bottom of the wall surface 4. In the example of FIG. 5, the light path L １ ~L ５ Although there are some areas outside of this range, the arrangement and size of the reflective surfaces 9 to 12 can be set appropriately depending on the purpose of illuminating the wall surface 4. By arranging the light source 3 and optical device 1 in this manner side by side at an appropriate interval on the left and right (direction perpendicular to the paper surface of FIG. 2), it is possible to irradiate light onto the left and right areas of the wall 4, thereby realizing a wall washer for the entire wall 4.

[0024] As described above, the optical device 1 has a curved reflective surface 9 that conforms to an ellipsoid (first ellipsoid 100) with one of a pair of focal points aligned with the position of the light source 3, and curved reflective surfaces 10-12 that conform to other ellipsoids (second ellipsoid 200 and third ellipsoid 300) with one of a pair of focal points common to the first ellipsoid 100. This configuration utilizes the property of an ellipsoid that light emitted from a focal point is reflected and then passes through the opposite focal point, allowing the light from the light source 3 to travel in the intended direction, suppressing a decrease in light utilization efficiency and efficiently illuminating the wall surface 4. By achieving a highly efficient wall washer in this way, the light source 3 and the optical device 1 can be made smaller, reducing costs and meeting a wider range of demands.

[0025] Furthermore, by using an existing lighting fixture installed on the ceiling 2, the conical light distribution of the light source 3 can be changed to the light distribution of the wall washer with a simple structure in which the optical device 1 is attached to the ceiling 2, and the wall washer can be realized at low cost.

[0026] [Second Embodiment] An optical device according to a second embodiment will be described with reference to FIGS. 6, 7A to 7D, and 8. Below, components common to the first embodiment are denoted by the same reference numerals, and their description will be omitted. Differences from the first embodiment will be mainly described. FIG. 6 is a cross-sectional view of the optical device 1 (a cross-sectional view corresponding to FIG. 2). FIGS. 7A to 7D are cross-sectional perspective views of the optical device 1. In the second embodiment, the optical device 1 is formed with a first reflecting surface 9, a second reflecting surface (1) 10, and a third reflecting surface 12, but does not have the second reflecting surface (2) 11 present in the first embodiment. The convex portion 7 is provided only within a 180° range on the rear side around the central axis S.

[0027] Next, the light irradiated onto the wall surface 4 will be described with reference to Fig. 8. In this embodiment, the light directly irradiated by the light source 3 and the light irradiated by each of the reflecting surfaces 9, 10, and 12 as shown in Figs. 4A to 4D are not shown, but as shown in Fig. 8, the wall surface 4 has an irradiated area R irradiated by the direct irradiated light. １ and the illumination area R by the second reflecting surface (1) 10. ２ and an irradiation area R irradiated by the first reflecting surface 9 and the third reflecting surface 12. ３ and the irradiation area R by the first reflecting surface 9. ４ This can be done.

[0028] The present invention has been described above in conjunction with the embodiments. However, the above embodiments merely illustrate specific examples of how the present invention may be implemented, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be implemented in various forms without departing from its technical concept or main features. In the embodiments, the light source 3 is a lighting fixture installed on the ceiling 2, but the light source 3 may also be a lighting fixture installed on the floor. Furthermore, in the embodiments, the optical device 1 is described as utilizing an existing lighting fixture, but the optical device to which the present invention is applied may also be configured as a lighting fixture with a built-in light source.

Claims

1. An optical device for illuminating a wall surface with light from a light source on the ceiling or floor, characterized in that it has a curved reflecting surface that follows the contours of an ellipsoid with one of a pair of focal points aligned with the position of the light source, and a curved reflecting surface that follows another ellipsoid with one of the pair of focal points as a common focal point with the ellipsoid.

2. An optical device for illuminating a wall surface with light from a light source on the ceiling or floor, characterized in that it has a first reflective surface that is a curved surface that follows a first ellipsoid with one focus aligned with the position of the light source, a second reflective surface that follows a curved surface that follows a second ellipsoid with one focus that is common to the one focus of the first ellipsoid, and a third reflective surface that follows a curved surface that follows a third ellipsoid with one focus that is common to the other focus of the first ellipsoid.

3. The optical device described in claim 2, wherein the other focal point of the first ellipsoid is located at a position farther from the light source and closer to the wall surface than the one focal point of the first ellipsoid, the other focal point of the second ellipsoid is located at a position farther from the light source and closer to the wall surface than the one focal point of the second ellipsoid, and the other focal point of the third ellipsoid is located at a position farther from the light source and closer to the wall surface than the one focal point of the third ellipsoid.

4. An optical device as described in claim 2 or 3, characterized in that the other focus of the second ellipsoid is located at a position farther from the light source and closer to the wall surface than the other focus of the first ellipsoid, and the other focus of the third ellipsoid is located at a position farther from the light source and closer to the wall surface than the other focus of the second ellipsoid.

5. An optical device according to any one of claims 2 to 4, characterized in that the first reflecting surface is arranged to face the direction of the wall surface, the second reflecting surface is arranged to face the direction of the wall surface and is adjacent to the first reflecting surface at a position farther from the light source than the first reflecting surface, and the third reflecting surface is arranged in an opposite direction to the first reflecting surface and the second reflecting surface.

6. The optical device according to claim 5, further comprising another second reflecting surface that is curved along the second ellipsoid and that is arranged in an opposite direction to the first reflecting surface and the second reflecting surface.

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