Sunlight-filtering-through-foliage simulation illumination device and art illumination device

Abstract

A sunlight-filtering-through-foliage simulation illumination device (100) includes: a light radiation unit (1) that radiates light (L1); and at least one light transmission unit (2) that passes the light (L1). The at least one light transmission unit (2) has: a light incident part (21) on which the incident light (L1) becomes incident; and a light emission part (22) that passes the incident light (L1). The light emission part (22) is apart from the light incident part (21). The light emission part (22) may have at least one of a recessed part (211) and a protruding part (212). The light incident part (21) may have at least one of a recessed part (211) and a protruding part (212).

Description

Sunlight filtering through trees simulation lighting device and art lighting device

[0001] The present disclosure relates to a lighting device that simulates sunlight filtering through trees and an art lighting device.

[0002] 2. Description of the Related Art There has been proposed an illumination device that projects projection light onto a predetermined area to project a preset projection image (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2020-167031

[0004] Further improvements are required in lighting devices to create an indoor space that gives the feeling of being outdoors.

[0005] The object of the present disclosure is to solve the above problems and to provide a desired lighting pattern.

[0006] A sunlight filtering through trees simulation lighting device according to one aspect of the present disclosure comprises: a light irradiation unit that irradiates light; and at least one light-transmitting unit that transmits the light, wherein the at least one light-transmitting unit has: a light incident unit through which the incident light enters; and a light exit unit that is spaced from the light incident unit and transmits the incident light, and the light exit unit has at least one of a concave portion or a convex portion. A sunlight filtering through trees simulation lighting device according to another aspect of the present disclosure comprises: a light irradiation unit that irradiates light; and at least one light-transmitting unit that transmits the light, wherein the at least one light-transmitting unit has: a light incident unit through which the incident light enters; and a light exit unit that is spaced from the light incident unit and transmits the incident light, and the light entrance unit has at least one of a concave portion or a convex portion. An artistic lighting device according to another aspect of the present disclosure comprises: the sunlight filtering through trees simulation lighting device; and a sheet onto which light emitted from the sunlight filtering through trees simulation lighting device is irradiated.

[0007] According to the present disclosure, a desired lighting pattern can be provided.

[0008] 10 is a diagram schematically illustrating a sunlight filtering through the trees simulation lighting device according to embodiment 1. FIG. 11 is a diagram illustrating an example of the structure of a light-transmitting section. FIG. 12 is a diagram illustrating an example of a sunlight filtering through the trees simulation lighting device formed at a target position. FIG. 13 is a diagram illustrating the principle by which a sunlight filtering through the trees simulation lighting device forms a sunlight filtering through the trees pattern at a target position. FIG. 14 is a diagram illustrating the sunlight filtering through the trees simulation lighting device shown in FIG. 4 viewed in the vertical direction. FIG. 15 is a diagram illustrating another example of a light-transmitting section. FIG. 16 is a diagram illustrating the sunlight filtering through the trees simulation lighting device shown in FIG. 13 is a diagram illustrating yet another example of a light-transmitting section. FIG. 17 is a diagram illustrating the sunlight filtering through the trees simulation lighting device shown in FIG. 14 is a diagram illustrating the sunlight filtering through the trees simulation lighting device according to embodiment 1. FIG. 17 is a diagram illustrating the light-transmitting section and a cover member viewed in the horizontal direction. FIG. 18 is a diagram illustrating another example of a light-transmitting section. FIG. 19 is a diagram illustrating a plurality of light-transmitting sections and cover members viewed in the vertical direction from the light irradiation section. FIG. 19 is a diagram schematically illustrating an art lighting device according to embodiment 3.

[0009] Embodiment 1. FIG. 1 is a diagram schematically illustrating a sunlight filtering through foliage simulation lighting device 100 according to embodiment 1. The sunlight filtering through foliage simulation lighting device 100 has at least one light emitting unit 1 that emits light L1 and at least one light-transmitting unit 2 that transmits light L1. The sunlight filtering through foliage simulation lighting device 100 may also be referred to as a lighting device. The sunlight filtering through foliage simulation lighting device 100 can be applied to, for example, a box-shaped movable meeting room, conference room, office, factory, hospital room, or other room. The sunlight filtering through foliage simulation lighting device 100 may be installed on a ceiling or may be a lighting device such as a downlight.

[0010] The light irradiation unit 1 has a light source such as a light emitting diode (LED), and may also have optical members such as a mirror or a lens in addition to the light source.

[0011] 1 , the sunlight filtering through trees artificial lighting device 100 has a plurality of light-transmitting sections 2. Each light-transmitting section 2 has a light incident section 21 onto which incident light L1 enters, and a light exit section 22 through which the incident light L1 passes. The light exit section 22 is spaced apart from the light incident section 21. That is, at least one light-transmitting section 2 has a three-dimensional shape.

[0012] 2 is a diagram showing an example of the structure of the light-transmitting portion 2. The region between the light incident portion 21 and the light exit portion 22 may be a space, or may include a member through which light passes. Each light-transmitting portion 2 has at least one of a recessed portion 211 and a protruding portion 212. In the example shown in FIG. 2, the light-transmitting portion 2 has a plurality of recessed portions 211 and a plurality of protruding portions 212.

[0013] The light-transmitting portion 2 may have a three-dimensional shape including a flat surface, a curved surface, a protruding portion, or a refracting portion. For example, the light-transmitting portion 2 may have a protruding portion or a refracting portion, and the protruding portion or the refracting portion may form the recessed portion 211 or the convex portion 212.

[0014] The light incident portion 21 may have at least one of a recessed portion 211 and a protruding portion 212. The light incident portion 21 may have both a recessed portion 211 and a protruding portion 212. In the example shown in FIGS. 1 and 2 , the light incident portion 21 has a plurality of recessed portions 211 and a plurality of protruding portions 212.

[0015] The light emitting portion 22 may have at least one of a recessed portion 211 and a protruding portion 212. The light emitting portion 22 may have both a recessed portion 211 and a protruding portion 212. In the example shown in FIGS. 1 and 2 , the light emitting portion 22 has a plurality of recessed portions 211 and a plurality of protruding portions 212.

[0016] One or more recesses 211, one or more protrusions 212, or a combination of recesses 211 and protrusions 212 may be provided between the light incident portion 21 and the light exit portion 22. In this case, a plurality of recesses 211, a plurality of protrusions 212, or a combination of recesses 211 and protrusions 212 may overlap between the light incident portion 21 and the light exit portion 22.

[0017] At least one light-transmitting portion 2 is, for example, a glass art piece made of glass, but may also be made of a resin such as acrylic.

[0018] The sun-filtering-through-trees simulation lighting device 100 can provide various desired lighting patterns, such as sun-filtering-through-trees patterns.

[0019] At least one light-transmitting portion 2 may have a plurality of colors. In other words, visible light of a plurality of wavelengths may be emitted from at least one light-transmitting portion 2. This allows a sunshine filtering through the trees pattern with various colors to be formed at the target position P.

[0020] The incident light L1 incident on the light-transmitting section 2 is refracted and scattered by at least one of the light-incident section 21 and the light-emitting section 22. The light may be absorbed or reflected in the light-transmitting section 2. The emitted light L2 emitted from the light-transmitting section 2 (specifically, the light-emitting section 22) is irradiated onto the target position P. A portion of the light emitted from the light-irradiating section 1 may reach the target position P without being incident on the light-transmitting section 2. A pattern is formed at the target position P by the shadow cast by the light-transmitting section 2 and the emitted light L2.

[0021] The target position P is a position where the emitted light L2 reaches, such as a wall, floor, desk, chair, ceiling, window, or curtain.

[0022] The light-transmitting section 2 may be suspended from the ceiling or installed inside the sunlight-filtering simulation lighting device 100. For example, if the sunlight-filtering simulation lighting device 100 has a case or a support member, the light-transmitting section 2 can be fixed by the case or the support member.

[0023] The light-transmitting sections 2 may completely overlap or partially overlap in the vertical direction. In this case, in the example shown in Fig. 1, the vertical direction refers to the direction along the line connecting the light-irradiating section 1 and the target position P, and the horizontal direction refers to the direction perpendicular to the vertical direction.

[0024] 1 , the plurality of light-transmitting portions 2 are arranged horizontally. As shown in FIG. 1 , the gaps between adjacent light-transmitting portions 2 may be empty spaces. In this case, light L1 passing through this space from the light irradiation portion 1 reaches the target position P directly without passing through the light-transmitting portions 2. Therefore, a non-uniform brightness distribution pattern (e.g., a sunlight-filtering pattern) is formed at the target position P by the light L1 that does not pass through the light-transmitting portions 2, the light L2 that passes through the light-transmitting portions 2, and the shadows cast by the light-transmitting portions 2.

[0025] One or more recesses 211, one or more protrusions 212, or a combination of recesses 211 and protrusions 212 may be provided between the light entrance section 21 and the light exit section 22. In this case, the one or more recesses 211 and the one or more protrusions 212 may be arranged regularly or irregularly in the vertical direction. The positions of each of the multiple recesses 211, each of the multiple protrusions 212, or each of the combinations of recesses 211 and protrusions 212 may be shifted from each other in the vertical direction.

[0026] The one or more recesses 211 and the one or more protrusions 212 may be arranged regularly or irregularly in the lateral direction.

[0027] The distance D from the light exit portion 22 of each light transmitting portion 2 to the target position P is non-uniform in the horizontal direction. With this configuration, a more natural sunlight filtering pattern can be formed.

[0028] A plurality of light-transmitting portions 2 may be integrated into a single component. For example, a plurality of light-transmitting portions 2 may form a single downlight cover. A light-transmitting portion 2 integrated into a single component may have at least one gap. Furthermore, a portion of a light-transmitting portion 2 integrated into a single component may be configured in a flat plate shape so that the angle at which light L1 enters the light incident portion 21 is equal to the angle at which light L1 exits the light exit portion 22 (this is an image of the cover member of the integrated exposed portion in FIG. 10 being flat).

[0029] Fig. 3 is a diagram showing an example of a sunlight filtering pattern formed at a target position P. Fig. 3 shows an example of a sunlight filtering pattern formed at a target position P when viewed vertically from the sunlight filtering simulation lighting device 100, and also shows the sunlight filtering simulation lighting device 100 when viewed horizontally.

[0030] In this application, sunlight filtering through the leaves refers to sunlight filtering through the trees or foliage of a forest, etc. The sunlight filtering through the leaves simulation lighting device 100 forms a sunlight filtering through the leaves pattern at the target position P, similar to that formed by gaps between the leaves or overlapping leaves.

[0031] A sunlight filtering pattern is a pattern formed on the ground based on the following two principles: (1) A small circular pattern formed on the ground by sunlight filtering through the many gaps between overlapping leaves, based on the same principle as a pinhole camera; and (2) A pattern of faint light and shadow formed on the ground by sunlight passing through and diffusing multiple leaves, or by sunlight being blocked by twigs or the like.

[0032] When the sunlight-filtering simulation lighting device 100 has multiple light-transmitting sections 2, the lighting device 100 creates an environment resembling overlapping leaves, and the light emitted from the light-irradiating sections 1 creates the following lighting effects: (1) Light from the light-irradiating sections 1 directly penetrates the space between the sunlight-filtering simulation lighting device 100 and the target position P through gaps between adjacent light-transmitting sections 2, and the light from the sunlight-filtering simulation lighting device 100 directly hits the target position P, such as a wall, floor, or desk surface in a room. (2) The small recesses 211 or protrusions 212 on the surface of each light-transmitting section 2 cause the light that passes through each light-transmitting section 2 to become scattered light, forming various patterns in the space between the sunlight-filtering simulation lighting device 100 and the target position P or at the target position P. Furthermore, when each light-transmitting section 2 is, for example, approximately cylindrical, the light-transmitting sections 2 can superimpose light that is simulating light blocked by tree branches and light that is simulating light that is scattered and transmitted by leaves, etc.

[0033] By combining these lighting effects, a pattern resembling sunlight filtering through the leaves can be created at a target position P such as a wall, floor, or desk.

[0034] FIG. 4 is a diagram illustrating the principle by which a sunlight-filtering pattern is formed at a target position P by the sunlight-filtering simulator lighting device 100. In the example shown in FIG. 4 , each of the translucent portions 2 arranged in the horizontal direction has a cylindrical shape (i.e., a cross section along the horizontal direction is circular). In the example shown in FIG. 4 , another translucent portion 2 is superimposed on top of a translucent portion 2 arranged in the horizontal direction. As shown in FIG. 4 , the recessed portion 211 or the protruding portion 212 shown in FIG. 2 can also be formed by combining multiple translucent portions 2. In this case, multiple translucent portions 2 can also be used as an integrated translucent portion 2.

[0035] Light L1 from the light emitting unit 1 is largely scattered by the light transmitting unit 2, and the shape of the light transmitting unit 2 is cast as a shadow at the target position P. To increase the contrast of the sunlight filtering pattern, it is preferable that the light L1 from the light emitting unit 1 has a high degree of parallelism. As shown in Fig. 4, the light transmitting unit 2 makes it possible to superimpose light that is assumed to be blocked by tree branches and light that is assumed to be scattered and transmitted by leaves, etc.

[0036] Fig. 5 is a vertical view of the sunlight filtering through trees simulation lighting device 100 shown in Fig. 4. As shown in Fig. 5, a portion of the light L2 that passes through each cylindrical (i.e., circular cross section along the horizontal direction) light-transmitting portion 2 is largely scattered, and the light does not reach the target position P corresponding to these light-transmitting portions 2. This makes it possible to form a shadow by the light-transmitting portion 2 at the target position P. Note that, because a portion of the scattered light also reaches the target position P, it is possible to form a faint sunlight filtering through trees pattern at the target position P.

[0037] As shown in Figure 5, depending on the shape of the light-transmitting section 2, it is possible to form a sunlight-filtering pattern projected from the light-transmitting section 2 at the target position P based on the relationship between the direction of the light L1 from the light-irradiating section 1 (i.e., the irradiation direction) and the target position P.

[0038] FIG. 6 is a diagram showing another example of the light-transmitting portion 2. In the example shown in FIG. 6, each of the light-transmitting portions 2 arranged in the horizontal direction has a concave semicylindrical shape (i.e., a cross section along the horizontal direction has a concave semicircular shape). In the example shown in FIG. 6, another light-transmitting portion 2 is superimposed on top of the light-transmitting portion 2 arranged in the horizontal direction. As shown in FIG. 6, the recessed portion 211 or the protruding portion 212 shown in FIG. 2 can also be formed by combining multiple light-transmitting portions 2. In this case, multiple light-transmitting portions 2 can also be used as an integrated light-transmitting portion 2. The light L1 from the light irradiation unit 1 is significantly scattered by the light-transmitting portion 2, so that the shape of the light-transmitting portion 2 is formed as a shadow at the target position P.

[0039] Fig. 7 is a vertical view of the sunlight filtering through trees simulation lighting device 100 shown in Fig. 6. In the example shown in Fig. 7, each light-transmitting portion 2 has a concave semicylindrical shape (i.e., a cross section along the horizontal direction has a concave semicircular shape). In this case, too, light L2 passing through each light-transmitting portion 2 is largely scattered, and the light does not reach the target position P corresponding to these light-transmitting portions 2.

[0040] As shown in Figure 7, depending on the shape of the light-transmitting section 2, it is possible to form a sunlight-filtering pattern projected from the light-transmitting section 2 at the target position P based on the relationship between the direction of the light L1 from the light-irradiating section 1 (i.e., the irradiation direction) and the target position P.

[0041] FIG. 8 is a diagram showing yet another example of the light-transmitting portion 2. In the example shown in FIG. 8, each of the light-transmitting portions 2 arranged in the horizontal direction has a semicylindrical shape (i.e., a cross section along the horizontal direction is semicircular). Light L1 from the light irradiation unit 1 is largely scattered by the light-transmitting portion 2, so that the shape of the light-transmitting portion 2 is formed as a shadow at the target position P. Note that, as in FIG. 6, the recessed portion 211 or the protruding portion 212 shown in FIG. 2 can also be formed by combining multiple light-transmitting portions 2.

[0042] Fig. 9 is a vertical view of the sunlight filtering through trees simulation lighting device 100 shown in Fig. 8. In the example shown in Fig. 9, each light-transmitting portion 2 has a semicylindrical shape (i.e., a cross section along the horizontal direction is semicircular). In this case, too, light L2 passing through each light-transmitting portion 2 is largely scattered, and the light does not reach the target position P corresponding to these light-transmitting portions 2.

[0043] The sunshine filtering simulated lighting device 100 may have the light-transmitting portion 2 shown in Fig. 4 and the light-transmitting portion 2 shown in Fig. 6. The light-transmitting portion 2 shown in Fig. 4 and the light-transmitting portion 2 shown in Fig. 6 may also be integrated into a single component. Each light-transmitting portion 2 is not limited to a cylindrical, semi-cylindrical, or concave semi-cylindrical shape, and may have a shape other than these. For example, each light-transmitting portion 2 may be a donut-shaped light-transmitting portion 2.

[0044] Embodiment 2. Figure 10 is a diagram showing a schematic diagram of a sunlight filtering through trees simulation lighting device 200 according to embodiment 2. The sunlight filtering through trees simulation lighting device 200 according to embodiment 2 further includes a cover member 30. The sunlight filtering through trees simulation lighting device 200 according to embodiment 2 differs from embodiment 1 in that it includes a cover member 30, and the configuration described in embodiment 1 is applicable to embodiment 2.

[0045] The cover member 30 covers the light emitting portion 22, thereby providing a dustproof effect. The emitted light L2 emitted from the light-transmitting portion 2 passes through the cover member 30. The light that has passed through the cover member 30 reaches the target position P, and a sunlight filtering pattern is formed at the target position P.

[0046] The cover member 30 may support at least one light-transmitting portion 2. This allows the cover member 30 to support the glass art part when the light-transmitting portion 2 is a glass art part, making it easier to install the glass art part. The light-transmitting portion 2 is not limited to being a glass art part, and may be made of resin such as acrylic.

[0047] The cover member 30 and at least one light-transmitting portion 2 may be integrally formed as a single component. In this case, the transmittance of the light-transmitting portion 2 may be equal to the transmittance of the cover member 30.

[0048] Fig. 11 is a diagram showing the light-transmitting portion 2 and the cover member 30 as viewed from the side. As shown in Fig. 11, a gap G may be provided between the light-transmitting portion 2 and the cover member 30. This increases the number of locations that contribute to refraction, thereby increasing the variety of sunlight-filtering patterns. Furthermore, by adjusting the shape of the gap G between the light-transmitting portion 2 and the cover member 30, the sunlight-filtering pattern can be adjusted.

[0049] Fig. 12 is a diagram showing another example of light-transmitting portion 2. As shown in Fig. 12, light-transmitting portion 2 may have a linearly extending portion and a curved portion. With this structure, light-transmitting portion 2 shown in Fig. 12 has at least one recessed portion 211 and at least one protruding portion 212. Light-transmitting portion 2 shown in Fig. 12 is also applicable to light-transmitting portion 2 in embodiment 1.

[0050] 13 is a view of a plurality of light-transmitting portions 2 and a cover member 30 viewed in the vertical direction from the light irradiation unit 1. In the example shown in FIG. 13 , a plurality of light-transmitting portions 2 are arranged on the cover member 30. Portions of the cover member 30 where no light-transmitting portions 2 are arranged are exposed portions 31. When the cover member 30 has exposed portions 31, part of the light L1 from the light irradiation unit 1 passes through the exposed portions 31 without passing through the light-transmitting portions 2, and reaches the target position P.

[0051] The sunlight filtering through the leaves simulation lighting device 200 according to the second embodiment has the same advantages as the sunlight filtering through the leaves simulation lighting device 100 described in the first embodiment.

[0052] Embodiment 3. Fig. 14 is a diagram schematically illustrating an art lighting device 300 according to embodiment 3. The art lighting device 300 includes the sunlight-filtering simulation lighting device 100 according to embodiment 1 or the sunlight-filtering simulation lighting device 200 according to embodiment 2, and a sheet 40 as a target position P. In the example shown in Fig. 14, the sunlight-filtering simulation lighting device 100 according to embodiment 1 is mounted on the art lighting device 300, but the sunlight-filtering simulation lighting device 200 according to embodiment 2 may be mounted on the art lighting device 300 instead of the sunlight-filtering simulation lighting device 100 according to embodiment 1.

[0053] The light emitted from the sunlight filtering through the trees simulation lighting device 100 reaches the sheet 40. As a result, a sunlight filtering through the trees pattern produced by the sunlight filtering through the trees simulation lighting device 100 is formed on the sheet 40, which is the target position P.

[0054] The sheet 40 is, for example, a cloth such as a curtain. This allows the shape of the sheet 40 to change due to wind from an air conditioner, for example, and thereby changes the pattern of sunlight filtering through the leaves formed on the sheet 40. The sheet 40 is not limited to cloth, and can be made of any material that can sway in the wind. For example, the sheet 40 may be made of resin or paper.

[0055] The artistic lighting device 300 according to the third embodiment has the same advantages as the sunlight filtering through the leaves simulation lighting device 100 described in the first embodiment or the sunlight filtering through the leaves simulation lighting device 200 according to the second embodiment.

[0056] The features of the above-described embodiments can be combined with each other.

[0057] REFERENCE SIGNS LIST 1 Light irradiation section, 2 Light-transmitting section, 21 Light incident section, 22 Light exit section, 30 Cover member, 31 Exposed section, 40 Sheet, 100, 200 Sunlight filtering simulation lighting device, 211 Concave section, 212 Convex section, 300 Art lighting device, P Target position.

Claims

1. A lighting device that simulates sunlight filtering through trees, comprising: a light irradiating section that irradiates light; and at least one light-transmitting section that transmits said light, wherein said at least one light-transmitting section has a light incident section where said light, which is incident light, enters, and a light exit section that is spaced apart from said light incident section and transmits said incident light, and wherein said light exit section has at least one of a concave section and a convex section.

2. The lighting device for simulating sunlight filtering through the trees according to claim 1, wherein the light entrance portion has at least one of a concave portion and a convex portion.

3. The lighting device for simulating sunlight filtering through the trees according to claim 1, wherein the light emitting portion has both the recessed portion and the protruding portion.

4. The lighting device for simulating sunlight filtering through the trees according to claim 1, wherein the light entrance portion has both a concave portion and a convex portion.

5. The lighting device for simulating sunlight filtering through the trees according to claim 1, further comprising a target position where light emitted from the light-transmitting section reaches, wherein a portion of the light emitted from the light-irradiating section reaches the target position without entering the light-transmitting section.

6. A lighting device that simulates sunlight filtering through trees, comprising: a light irradiating section that irradiates light; and at least one light-transmitting section that transmits the light, wherein the at least one light-transmitting section has a light incident section where the light, which is incident light, is incident; and a light exit section that is spaced apart from the light incident section and transmits the incident light, and wherein the light incident section has at least one of a concave section and a convex section.

7. The lighting device for simulating sunlight filtering through the trees according to claim 6, wherein the light incident portion has both the recessed portion and the protruding portion.

8. A lighting device for simulating sunlight filtering through trees according to any one of claims 1 to 7, characterized in that the at least one light-transmitting section is a plurality of light-transmitting sections.

9. The lighting device for simulating sunlight filtering through the trees according to claim 8, wherein the plurality of light-transmitting sections are partially overlapped.

10. A lighting device for simulating sunlight filtering through trees according to any one of claims 1 to 9, characterized in that visible light of a plurality of wavelengths is emitted from said at least one light-transmitting portion.

11. The lighting device for simulating sunlight filtering through trees according to any one of claims 1 to 10, characterized in that at least one of the light-transmitting portions has a plurality of colors.

12. A lighting device for simulating sunlight filtering through trees described in any one of claims 1 to 11, further comprising a cover member that covers the light emitting portion, and the light emitted from at least one of the light-transmitting portions passes through the cover member.

13. The lighting device for simulating sunlight filtering through the trees according to claim 12, characterized in that the cover member supports the at least one light-transmitting portion.

14. The lighting device for simulating sunlight filtering through the trees according to claim 12 or 13, characterized in that the transmittance of said at least one light-transmitting portion is equal to the transmittance of said cover member.

15. An art lighting device comprising: a lighting device that simulates sunlight filtering through the trees according to any one of claims 1 to 14; and a sheet onto which light emitted from the lighting device that simulates sunlight filtering through the trees is irradiated.

16. The artistic lighting device according to claim 15, wherein the sheet is made of cloth.

Images