Luminaire

Abstract

To provide a luminaire capable of achieving miniaturization and cost reduction.SOLUTION: A luminaire 10 is the luminaire 10 which emits long light having length along a first direction and width along a second direction orthogonal to the first direction into a third direction different from the first direction and the second direction. The luminaire 10 includes: a plurality of light sources 20 arranged along the first direction, and emitting light along the second direction; a reflection mirror 40 for reflecting the light emitted from the plurality of light sources 20 into the third direction; and a housing 50 for storing the plurality of light sources 20 and the reflection mirror 40, and having an opening 51 for emitting the light reflected by the reflection mirror 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an illumination device that provides illumination with a projected image having an elongated shape. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known an elongated interior lighting device in which a plurality of light sources are arranged in a row along the longitudinal direction and which is attached to a mounting surface such as a ceiling or wall of a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-149134 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a long-shaped lighting device, since multiple light sources are arranged along the longitudinal direction, there is a risk that the longitudinal dimension of the lighting device itself will be large. In addition, in order to lengthen the projected image in the longitudinal direction, it is necessary to increase the number of light sources. For this reason, it has been an issue to miniaturize a long-shaped lighting device and reduce the number of parts.

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a lighting device that can be made smaller and less expensive. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the lighting device disclosed herein is a lighting device that emits a long piece of light having a length along a first direction and a width along a second direction perpendicular to the first direction, in a third direction different from the first direction and the second direction, and includes a plurality of light sources arranged along the first direction and emitting light along the second direction, a reflector that reflects the light emitted from the plurality of light sources in the third direction, and a housing that houses the plurality of light sources and the reflector and has an opening through which the light reflected by the reflector can be emitted. Effect of the Invention

[0007] The lighting device of the present disclosure can achieve miniaturization and cost reduction. [Brief description of the drawings]

[0008] [Figure 1] 1 is an explanatory diagram showing a rear view of a truck bed on which a lighting device according to an embodiment of the present invention is mounted on a ceiling. [Diagram 2] FIG. 2 is an explanatory diagram showing an example of the arrangement of lighting devices. [Diagram 3] FIG. 2 is a cross-sectional view of the lighting device taken along a vertical plane. [Figure 4] FIG. 2 is a partial cross-sectional view of the lighting device taken along a horizontal plane. [Diagram 5] 4A to 4C are diagrams illustrating the illumination range of the illumination device when viewed in the front-back direction and the left-right direction. [Figure 6] FIG. 2 is a cross-sectional view of the lighting device taken along a vertical plane. [Figure 7] FIG. 2 is a partial cross-sectional view of the lighting device taken along a horizontal plane. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the lighting device of the present disclosure will be described with reference to the attached drawings. The lighting device of the present disclosure is arranged on a ceiling or a wall surface, and illuminates an illumination target with a long (linear) projected image. The lighting device can be arranged and used on the ceiling of a vehicle such as a truck or on the ceiling of a building. In this embodiment, an example will be described in which the lighting device of the present disclosure is attached to the ceiling of a truck bed, and a long projected image is illuminated on the floor and wall surfaces to alert people to prevent falls from the truck bed.

[0010] [First embodiment] FIG. 1 is an explanatory diagram showing a rear view of a bed 2 of a truck 1 on whose ceiling 3 an illumination device 10 according to this embodiment is mounted. FIG. 2 is an explanatory diagram showing an example of the arrangement of the lighting device 10. As shown in FIG. FIG. 3 is a cross-sectional view of the lighting device 10 taken along a vertical plane. FIG. 4 is a partial cross-sectional view of the lighting device 10 taken along a horizontal plane. FIG. 5 is a diagram illustrating illumination ranges 12, 13 of the illumination device 10 when viewed in the front-rear and left-right directions.

[0011] In the following explanation, "front", "rear", "upper", "lower", "right" and "left" follow the definitions of "Fr.", "Re.", "To.", "Bo.", "R" and "L" in Figures 1 to 7. A horizontal plane is a plane that runs along the front-to-back and left-to-right directions. A vertical plane is a plane that runs along the front-to-back and up-to-down directions.

[0012] 1 and 2, the lighting device 10 is disposed in a ceiling 3 in a bed 2 of a truck 1, so that the ceiling 3 and a cover member 60 described later are flush with each other, or is attached to the ceiling 3. The lighting device 10 has a plurality of light sources 20, an optical member 30, a reflecting mirror 40, a housing 50, and a cover member 60.

[0013] 4, the multiple light sources 20 are arranged along the left-right direction (first direction) and emit light L1 (illumination range is shown in the figure) backward in the front-rear direction (second direction perpendicular to the first direction). The multiple light sources 20 are, for example, three LEDs (Light-Emitting Diodes) arranged at equal intervals on a single light source substrate 21. The multiple light sources 20 may be LEDs capable of emitting monochromatic light, or may be three-color LEDs capable of emitting each color.

[0014] The optical member 30 is made of a transparent resin such as polycarbonate. The optical member 30 receives light L1 emitted from the multiple light sources 20, shapes the light into a required light, and emits the light L2 to the reflecting mirror 40. The optical member 30 has an incident surface 31 and an exit surface 32 for the light L1 from each light source 20.

[0015] The shape of the optical member 30 is determined so as to convert the light L1 from the light source 20 into light corresponding to the length and width of the projected image 11 (long light). That is, the curvatures of the entrance surface 31 and the exit surface 32 of the horizontal cross-sectional shape of the optical member 30 in FIG. 4 are determined so that the light L1 from the light source 20 is diffused in the left-right direction. The shape of the vertical cross-sectional shape of the optical member 30 in FIG. 3 is determined according to the shape (width) of the projected image 11 illuminated on the illumination target. For example, the entrance surface 31 has a concave shape that matches the side shape of a semicylinder having a central axis along the up-down direction. The exit surface 32 has a convex shape consisting of a toroidal surface with different radii of curvature in the horizontal cross-section and the vertical cross-section.

[0016] The reflecting mirror 40 is a flat mirror formed, for example, by depositing aluminum on a glass plate, and has a flat reflecting surface. The reflecting mirror 40 reflects the light L2 emitted from the multiple light sources 20 and further formed and emitted by the optical member 30 downward in the vertical direction (a third direction different from the first direction and the second direction). Note that FIG. 4 shows the reflecting mirror 40 viewed from above.

[0017] The housing 50 is a box-like member having a shape corresponding to the shapes of the multiple light sources 20 (light source substrate 21), the optical member 30, and the reflector 40, and houses these items. The housing 50 is made of a material having excellent heat dissipation properties against the heat of the light sources 20, for example, aluminum. The housing 50 has an opening 51 on a surface facing downward. The opening 51 allows the light L3 reflected by the reflector 40 to be emitted from the housing 50 to the illumination target.

[0018] The cover member 60 is made of, for example, a polycarbonate sheet, and covers the opening 51 of the housing 50. The cover member 60 prevents dust and the like from entering the housing 50. In addition, from the viewpoint of obtaining a clear projection image 11, the cover member 60 transmits the light L3 emitted from the opening 51 without diffusing the light.

[0019] Such an illumination device 10 diffuses and forms light L1 from the multiple light sources 20 by the optical member 30 in accordance with the projection image 11, and also reflects the light toward the illumination target by the reflecting mirror 40, thereby illuminating the illumination target with the projection image 11 corresponding to the light L3. That is, the illumination device 10 can form a long projection image 11 by using a small number of light sources 20 and optical member 30 in an optimal manner.

[0020] Specifically, as shown in FIG. 5, the lighting device 10 emits a long light L3 downward having a length in the left-right direction and a width in the front-back direction, and can illuminate the target 9 with a projected image 11 consisting of a lighting range 12 that is radiated (extending) over a wide area and a lighting range 13 that is radiated to a predetermined width.

[0021] When the lighting device 10 is mounted on the bed 2 of the truck 1, as shown in Fig. 1, a projected image 11 is projected and illuminated at any timing on the floor 5 and left and right wall surfaces 6 near (slightly before) the location where the luggage of the truck 1, which is the lighting target, is loaded and unloaded. For example, by turning on the lighting device 10 in red at a timing when attention to prevent falls is required, a line can be formed with the projected image 11 at a required timing without adding (permanently installing) a line to the floor 5 and wall surfaces 6 of the truck 1 themselves to call attention to the prevention of falls.

[0022] Furthermore, since the lighting device 10 reflects the light L1 from the light source 20 downward by the reflecting mirror 40 after passing through the optical member 30, the vertical dimension can be made smaller than when the light source 20 and the optical member 30 are arranged in the vertical direction and the light L1 from the light source 20 is directly emitted downward. Therefore, the lighting device 10 in this embodiment can be made smaller and less expensive.

[0023] Furthermore, the lighting device 10 can clearly form a long, linear projection image 11 by forming and emitting the light L1 from the light source 20 using the above-mentioned optical member 30. Therefore, the lighting device 10 can suitably form a boundary line for calling attention to prevent a person from falling off the bed 2 of the truck 1, as in the example of this embodiment, and can allow the user to clearly recognize it.

[0024] Furthermore, as a result of the miniaturization of the lighting device 10, it becomes possible to embed the lighting device 10 in the ceiling 3 of the truck 1 as shown in FIG. 2, thereby improving the degree of freedom in placement.

[0025] [Second embodiment] FIG. 6 is a cross-sectional view of the lighting device 110 taken along a vertical plane.

[0026] FIG. 7 is a partial cross-sectional view of the lighting device 110 taken along a horizontal plane.

[0027] In the lighting device 110 of the second embodiment, the configurations and parts corresponding to those of the lighting device 10 of the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0028] The lighting device 110 has a plurality of light sources 20, an aperture plate 130, a reflecting mirror 140, a housing 50, and a cover member 60. The plurality of light sources 20, the housing 50, and the cover member 60 have substantially the same configuration as the lighting device 10, and therefore detailed description thereof will be omitted.

[0029] The aperture plate 130 is disposed between the light source 20 and the reflector 140, and is made of a thin plate having light blocking properties, such as black ABS. The aperture plate 130 has a number of apertures 131 according to the number and positions of the light sources 20. The apertures 131 transmit a portion of the light L1 from the multiple light sources 20 toward the reflector 140, and block the remaining portion of the light L1. The shape of the apertures 131 can be appropriately selected from a circle, an ellipse, a rectangle, a rectangular hole, a slit-like long hole, and the like.

[0030] The reflecting mirror 140 is a curved mirror with a concave reflecting surface, formed by, for example, evaporating aluminum onto polycarbonate. The reflecting mirror 140 shapes the light L2 emitted from each opening 131 into light corresponding to the length and width of the projected image 11 (long light), and reflects it downward. Note that FIG. 7 shows the reflecting mirror 140 as seen from above.

[0031] Specifically, the reflecting mirror 140 has a focal point that coincides with the center point of the light source 20 in a vertical cross section passing through the center of each light source 20. As a result, the light L2 incident on the reflecting mirror 140 becomes a substantially parallel reflected light L3. Furthermore, in a horizontal cross section, the reflecting mirror 140 has no curvature with respect to the light L2 emitted from the light source 20 (aperture plate 130). As a result, the light L2 incident on the reflecting mirror 140 is reflected as it is according to the angle of incidence. The light L3 reflected by the reflecting mirror 140 is emitted downward from the opening 51, similar to the lighting device 10, and illuminates the illumination target with the projected image 11.

[0032] Such an illumination device 110 forms the projected image 11 by the aperture plate 130 and the reflector 140, and therefore can have a smaller dimension at least in the front-to-rear direction than the illumination device 10 of the first embodiment in which the projected image 11 is formed by the optical member 30. As a result, the illumination device 110 can have a smaller dimension in the front-to-rear direction of the housing 50 than the dimension in the front-to-rear direction of the housing 50 of the illumination device 10, thereby achieving even greater miniaturization.

[0033] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims.

[0034] For example, the third direction (direction of the optical axis) in which the lighting device emits light is downward, but is not limited thereto, and the optical axis may be inclined with respect to the vertical direction. Furthermore, as long as the emission direction of the lighting device is different from the emission direction of the light source, the reflecting mirror 40 of the lighting device 10 may be a curved mirror. [Explanation of symbols]

[0035] 1 Truck (vehicle) 2 Cargo platform 3. Ceiling 5 Beds 6 Left and right walls (walls) 10, 110 Lighting equipment 11 Projection image L1, L2, L3 Light 20 light source 21 Light source board 30 Optical Components 31 Incidence plane 32 Exit surface 40, 140 reflector 50 Case 51 Aperture 60 Cover member 130 Aperture plate 131 Aperture

Claims

1. A lighting device that emits an elongated light beam having a length along a first direction and a width along a second direction perpendicular to the first direction in a third direction different from the first direction and the second direction, A plurality of light sources arranged along the first direction and emitting light along the second direction; a reflecting mirror that reflects the light emitted from the plurality of light sources in the third direction; a housing that houses the plurality of light sources and the reflector and has an opening through which the light reflected by the reflector exits.

2. an optical member that receives the light from the plurality of light sources, forms light according to the length and width of the elongated light, and emits the formed light to the reflecting mirror; The illumination device according to claim 1 , wherein the reflector is a plane mirror that reflects the formed light in the third direction.

3. an aperture plate having a plurality of apertures that transmit a portion of the light from each of the plurality of light sources toward the reflecting mirror and block the remaining portion; 2. The lighting device according to claim 1, wherein the reflecting mirror is a curved mirror that reflects the incident light emitted from each of the openings of the aperture plate in the third direction by forming the light into light corresponding to the length and width of the elongated light.

4. 2. The lighting device according to claim 1, wherein the lighting target is a cargo bed of a vehicle.

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