JP2020053194A - Lighting device - Google Patents

Abstract

To provide a lighting device that can change a light radiation direction, be miniaturized and stably hold the light radiation direction in a certain direction.SOLUTION: A lighting device 100 includes: a light source 30; a lens 40 for transmitting light emitted in a first direction from the light source 30 therethrough; and a support mechanism 80 for supporting the lens 40 so as to be movable in a second direction crossing with the first direction relative to the light source 30.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a lighting device such as a downlight that can change a light irradiation direction.

  2. Description of the Related Art Conventionally, as a lighting device, for example, a downlight capable of changing a light irradiation direction by tilting a lamp body with respect to a frame attached to a hole in a ceiling is known.

JP 2018-139201 A

  In recent years, demands for downlighting downlights have been increasing. However, the support mechanism that supports the lamp body in a tiltable manner has a relatively complicated structure and is difficult to reduce in size.

  In addition, when the lamp is tiltably attached to the ceiling, when an external force acts on the lamp, the lamp may be undesirably tilted, and the direction of the lamp may be maintained at a desired angle. difficult. For example, the power supply cable connected to the lamp body is often hard and hardly deformed, and stress may act on the lamp body from the power supply cable to change the angle of the lamp body.

  Therefore, there is a demand for a lighting device that can change the light irradiation direction, can be downsized, and can stably hold the light irradiation direction in a fixed direction.

  A lighting device according to an embodiment includes a light source, a lens that transmits light emitted from the light source in a first direction, and a lens that is movable with respect to the light source in a second direction that intersects the first direction. And a supporting mechanism.

  According to the embodiment, it is possible to provide a lighting device that can change the light irradiation direction, can be downsized, and can stably maintain the light irradiation direction in a fixed direction.

FIG. 1 is a cross-sectional view illustrating the lighting device according to the first embodiment. FIG. 2 is a schematic diagram illustrating an example of a lens support mechanism of the illumination device in FIG. 1. FIG. 3 is a cross-sectional view along F3-F3 in FIG. FIG. 4 is a bottom view of the structure of FIG. 2 as viewed from the light irradiation direction. FIG. 5 is a bottom view showing a state where the lens of FIG. 4 is slid. FIG. 6 is a ray diagram when the lens is arranged at the position shown in FIG. FIG. 7 is a diagram showing the light distribution of FIG. FIG. 8 is a ray diagram when the lens is arranged at the position shown in FIG. FIG. 9 is a diagram showing the light distribution of FIG. FIG. 10 is a cross-sectional view illustrating a lighting device according to the second embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
The lighting devices 100 and 200 according to the embodiment include a light source 30, a radiator 20 having the light source 30 fixed thereto, a lens 40 that transmits light emitted from the light source 30 in the first direction, and a light source 30. And a support mechanism 80 that movably supports the lens 40 in a second direction intersecting the first direction.

  In the following description, an axis perpendicular to the light emitting surface 30a passing through the center of the light source 30 is defined as an optical axis O. The lighting devices 100 and 200 are mounted in mounting holes (not shown) in the ceiling such that the optical axis O is along the vertical direction. Note that the direction along the optical axis O is a first direction.

(First embodiment)
As shown in FIG. 1, the lighting device 100 according to the first embodiment includes a lamp body 10 and a frame body 50. The lamp body 10 has a radiator 20, a light source 30, and a lens 40. The frame 50 has a decorative frame 60 and a reflector 70. Further, the lamp body 10 has a support mechanism 80 (see FIG. 2) that supports the lens 40 so as to be movable with respect to the radiator 20 (the light source 30) in a direction orthogonal to the optical axis O (the left-right direction in FIG. 1). .

  The radiator 20 has a mounting plate portion 21, a tubular portion 22, and a plurality of radiating fins 23 integrally. The mounting plate portion 21 includes a light source 30 substantially at the center of one surface 21a (the lower surface in the figure). The cylindrical portion 22 is provided to protrude vertically downward from the peripheral portion of the one surface 21 a of the mounting plate portion 21 so as to surround the light source 30. The plurality of radiating fins 23 are provided in parallel with each other so as to project vertically upward from the other surface 21b (the upper surface in the drawing) of the mounting plate portion 21. The plurality of radiation fins 23 extend in a direction parallel to the optical axis O and parallel to the paper surface. The radiator 20 is integrally formed of, for example, a metal such as aluminum having a high thermal conductivity.

  The light source 30 includes, for example, a cylindrical frame 32 provided on a surface 31 a of a rectangular substrate 31, and a plurality of LED (Light Emitting Diode) chips (not shown) mounted on the surface 31 a of the substrate 31 in the frame 32. Is formed by filling a resin 33 containing a fluorescent material into the substrate and sealing a plurality of LEDs. The light source 30 is not limited to this, and an OLED, an organic EL, or the like may be used. The LED emits light when energized, and generates heat. The heat generated from the LED is transmitted to the plurality of radiating fins 23 via the substrate 31 of the light source 30 and the mounting plate portion 21 of the radiator 20, and is radiated through the plurality of radiating fins 23.

  The lens 40 is disposed so as to face an end (the lower end in the drawing) in the direction of the optical axis O that is separated from the mounting plate 21 of the cylindrical portion 22 of the radiator 20. In the present embodiment, a Fresnel lens is used as the lens 40. The lens 40 is slidably attached to the radiator 20 in a direction (second direction) perpendicular to the optical axis O by a support mechanism 80 described below. The lens 40 is not limited to the Fresnel lens, and other lenses can be used.

  FIG. 2 is a perspective view of a main part showing a state in which a slide projection 46 of a movable member 45 having a lens 40 is inserted into a slit 25 provided on the outer peripheral surface of the cylindrical portion 22 of the radiator 20. FIG. 3 is a cross-sectional view along F3-F3 in FIG. 2 and 3, the illustration of the plurality of radiating fins 23 of the radiator 20 is omitted, and the configuration of FIG. 1 is shown upside down. The two slide projections 46 of the movable member 45 having the two slits 25 and the lens 40 provided on the radiator 20 function as a support mechanism 80.

  The movable member 45 includes a rectangular flat plate portion 45 a integrally provided with the lens 40, two side plate portions 45 b and 45 b integrally extended vertically from two opposing sides of the flat plate portion 45 a, and each side plate portion. And a slide projection 46 that is continuous with an end side of the 45b that is separated from the flat plate portion 45a and that protrudes inward. The lens 40 and the movable member 45 are formed, for example, by integral molding of a transparent resin. The slide projection 46 does not necessarily need to be provided over the entire length of the side plate portion 45b, and the length in the slide direction can be set arbitrarily.

  The tubular portion 22 of the radiator 20 has a substantially rectangular tubular outer shape, and has a cylindrical space S (FIGS. 1, 3) inside. The cylindrical portion 22 has slits 25 on the outer peripheral surfaces of the two wall portions 22a and 22a facing each other. The two slits 25 are arranged in parallel with each other near an end of the cylindrical portion 22 separated from the light source 30 in the direction of the optical axis O, and extend in a direction orthogonal to the optical axis O. The distance between the outer peripheral surfaces of the two wall portions 22a provided with the slits 25 is slightly shorter than the distance between the two side plate portions 45b of the movable member 45. The width of the slit 25 is slightly larger than the thickness of the slide projection 46 of the movable member 45. Therefore, when the movable member 45 is attached to the cylindrical portion 22 as shown in the drawing by inserting the slide protrusion 46 into the slit 25, the movable member 45 is in a direction perpendicular to the optical axis O with respect to the cylindrical portion 22 (second direction). Direction).

  The movable member 45 is easily separated from the tubular portion 22 simply by inserting the two slide protrusions 46 into the corresponding slits 25. For this reason, the support mechanism 80 has a slip-off prevention mechanism (not shown) for preventing the movable member 45 from coming off the tubular portion 22. For example, the cylindrical portion 22 may have a regulation protrusion or the like that regulates movement by engaging a part of the movable member 45.

  As shown in FIG. 1, the decorative frame 60 is formed by a substantially cylindrical tubular wall portion 61 having an outer diameter that can be inserted into a mounting hole (not shown) of the ceiling and a mounting hole arranged along the lower surface of the ceiling wall. A large-diameter annular flange portion 62 is integrally provided. The decorative frame 60 is provided with a plurality of mounting springs (not shown) for fixing the decorative frame 60 to the mounting holes in the ceiling. The central axis of the decorative frame 60 coincides with the central axis P of the mounting hole.

  The lamp body 10 described above is fixed to the decorative frame 60. The lamp body 10 is fixed to the decorative frame 60 such that the optical axis O of the lamp body 10 is displaced from the center axis P of the decorative frame 60. Specifically, the optical axis O and the central axis P are arranged to be shifted in advance along the moving direction of the movable member 45 described above. Thereby, a moving path of the movable member 45 is secured.

  The reflector 70 is attached inside the decorative frame 60. Therefore, the center axis of the reflector 70 is also shifted from the optical axis O of the lamp body 10. The reflector 70 has a cylindrical reflecting surface 71 on its inner surface. The reflecting surface 71 is positioned with respect to the central axis P such that the inclination angle on one side (left side in FIG. 1) of the moving direction of the movable member 45 is larger than the inclination angle on the other side (right side in FIG. 1) of the moving direction. It has an asymmetric shape.

  As shown in FIGS. 4 and 5, the movable member 45 having the lens 40 integrally moves in a direction orthogonal to the optical axis O. FIG. 4 is a diagram illustrating a state in which the movable member 45 is slid to a position where the optical axis O of the light source 30 passes through the center of the lens 40 (FIG. 1) as viewed from the light irradiation direction. FIG. 5 is a diagram illustrating a state where the movable member 45 is slid to a position where the center of the lens 40 is shifted from the optical axis O. The movable range of the movable member 45 is regulated between the position in FIG. 4 and the position in FIG.

  As shown in FIG. 6, when the movable member 45 is slid to a position where the center of the lens 40 overlaps the optical axis O (the position in FIG. 4), the light emitted from the light source 30 passes through the lens 40. The light is emitted as illumination light substantially parallel to the optical axis O. That is, in a state where the lighting device 100 is mounted on the ceiling, the illumination light is emitted straight downward. FIG. 7 shows the light distribution of the illumination light at this time.

  On the other hand, as shown in FIG. 8, when the lens 40 is slid in a direction orthogonal to the optical axis O (the state shown in FIG. 5), the light from the light source 30 is refracted by the lens 40 and tilts with respect to the optical axis O. The illumination light is emitted in the direction. FIG. 9 shows the light distribution at this time. The emission direction of the illumination light can be arbitrarily adjusted by changing the distance by which the movable member 45 is slid. Therefore, for example, when the lens 40 is slid toward the wall while the illumination device 100 is mounted on the ceiling, the illumination light can be directed to the wall, and can be used as indirect illumination.

  As described above, according to the first embodiment, the irradiation direction of the illumination light is changed by a simple configuration in which the lens 40 is simply slid in the direction orthogonal to the optical axis O with respect to the radiator 20 (the light source 30). Can be. In addition, thereby, the configuration for changing the irradiation direction of the illumination light can be simplified, and the size of the illumination device 100 can be reduced.

  Further, according to the present embodiment, unlike the related art, it is not necessary to incline the lamp body receiving the stress from the power supply cable with respect to the frame, and only by sliding the movable member 45 having the lens 40, the irradiation direction of the illumination light can be obtained. Can be changed. For this reason, the movable member 45 is hardly affected by external stress, and the irradiation direction of the illumination light can be stably held in a fixed direction.

  In addition, according to the present embodiment, as shown in FIG. 1, the lamp 10 is displaced in a direction perpendicular to the optical axis O with respect to the decorative frame 60 so that the central axis P of the reflector 70 is displaced from the optical axis O. doing. For this reason, it is possible to secure a movable space for the movable member 45 having the lens 40, and it is possible to prevent the movable member 45 from hitting the reflector 70.

  Further, according to the present embodiment, as shown in FIG. 1, the inclination angle of the reflection surface 71 of the reflector 70 on the distal end side (left side in the drawing) of the movement direction of the lens 40 is set at the base end side (right side in the drawing) of the movement direction. The angle is larger than the inclination angle of the reflection surface 71. For this reason, even when the lens 40 is slid to the position shown in FIGS. 5 and 8, it is possible to prevent a problem that the reflector 70 blocks the illumination light whose irradiation angle has changed.

  Further, according to the present embodiment, since the Fresnel lens is used as the lens 40, the thickness of the lens 40 in the direction of the optical axis O can be reduced, and the movable member 45 can be reduced in weight. Therefore, the movement of the movable member 45 can be made smooth, and the operability can be improved. Further, by using a Fresnel lens, the thickness of the lens 40 can be reduced, so that the size of the lighting device 100 can be reduced.

(Second embodiment)
As shown in FIG. 10, the lighting device 200 according to the second embodiment has substantially the same structure as the lighting device 100 of the first embodiment. Therefore, here, components that function in the same manner as the lighting device 100 of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The movable member 45 of the illumination device 200 is slid in a direction opposite to that of the first embodiment (in the direction of the arrow in the drawing) when the irradiation direction of the illumination light is inclined. The optical axis O of the light source 30 and the center of the lens 40 overlap with the movable member 45 arranged at the illustrated position. In this state, the illumination light is emitted vertically downward. In this state, when the movable member 45 is slid in the direction of the arrow shown in the figure, the irradiation direction of the light emitted from the light source 30 is inclined to the lower right in the figure. That is, it inclines in the direction opposite to that of the first embodiment. A space for securing a moving space for the movable member 45 is provided on the distal end side (the right side in the drawing) of the moving direction of the movable member 45. This space is formed by displacing the frame 50 lamp body 10 in advance in the right direction in the figure.

  When the movable member 45 is slid in the direction of the arrow in the figure, the light emitted from the light source 30 is transmitted through the lens 40 and emitted in a tilted direction (the lower right direction in the figure). At this time, the illumination light emitted through the lens 40 strikes the reflection surface of the reflector 70, is reflected, and is irradiated in the lower left direction in the figure. That is, in the present embodiment, the shape of the reflection surface 71 of the reflector 70 is made different from that of the first embodiment, and the light transmitted through the lens 40 is reflected by the reflector 70 before being emitted as illumination light. .

  As described above, as in the present embodiment, the illumination light can be inclined even when the lens 40 is slid and the emission direction of the illumination light is inclined to be reflected by the reflection surface 71 of the reflector 70, as in the first embodiment. The effect can be achieved.

  According to the illuminating device of at least one of the embodiments described above, the irradiation direction of the illuminating light is changed to a desired direction by having the support mechanism 80 that slidably supports the lens 40 in a direction orthogonal to the optical axis O. It is possible to reduce the size and stably maintain the light irradiation direction in a certain direction.

  Although several embodiments of the present invention have been described, these embodiments or examples are provided as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

  For example, in the above-described embodiment, the case where the lens 40 is linearly slid in the direction orthogonal to the optical axis O has been described. However, the present invention is not limited to this, and the lens 25 may be formed by changing the shape of the slit 25 provided in the cylindrical portion 22. 40 may be moved three-dimensionally. Further, the lamp body 10 can be made rotatable about the optical axis O.

  In the above-described embodiment, the case where the lens 4 is slidably supported in the direction orthogonal to the optical axis O with respect to the radiator 20 has been described. The lens 40 may be slidably supported. In any case, a mechanism for supporting the lens 40 movably in a direction intersecting the optical axis O may be provided.

  Reference Signs List 10 lamp body, 20 radiator, 21 mounting plate, 22 cylindrical part, 23 radiating fin, 25 slit, 30 light source, 30a light emitting surface, 40 lens, 45 movable member, 46 ... Sliding projection, 50 ... Frame body, 60 ... Decorative frame, 70 ... Reflector, 71 ... Reflection surface, 80 ... Support mechanism, 29 ..., 100, 200 ... Lighting device, O ... Optical axis, P ... Center axis.

Claims (5)

A light source;
A lens for transmitting light emitted from the light source in a first direction;
A support mechanism that movably supports the lens with respect to the light source in a second direction that intersects the first direction;
Lighting device having a. A radiator to which the light source is fixed,
The support mechanism movably supports the lens in the second direction with respect to the radiator,
The lighting device according to claim 1. A cylindrical shape that is arranged along the first direction on the opposite side of the lens from the light source, and the inclination angle of one side of the second direction is larger than the inclination angle of the other side of the second direction; Further comprising a reflector having a reflective surface of
The lighting device according to claim 1. An axis disposed along the first direction on the opposite side of the lens from the light source and offset in the second direction with respect to an axis of light emitted from the light source in the first direction; Further comprising a reflector having a cylindrical reflecting surface centered on
The lighting device according to claim 1. The lens is a Fresnel lens,
The lighting device according to claim 1.