JP2020087501A - Lighting device - Google Patents

Abstract

To provide a lighting device capable of changing brightness and color tone of light emitted from a light guide member without changing the brightness and color tone of light from a light source.SOLUTION: An input device 100 of the present invention is characterized in having: a light source 10; a light guide member 20 having an incident surface 21 and an emission surface 22, and causing Rayleigh scattering; and an angle adjusting device 30 that changes an emission direction of the light of the light source 10. By adopting such a configuration, a lighting device is configured such that for example, when using white light having various wavelengths of light for the light source, by changing an incident angle of light from a state where light is made incident perpendicularly to the light guide member, blue light can be gradually changed to red light in order from a position farther from the light source.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lighting device, and more particularly, to a lighting device capable of changing a color tone or a light intensity without changing a color tone or a light intensity of a light source.

As a lighting device using a scattering panel, a light source and a reflective layer that reflects light, having a light-transmitting property, and a light-diffusing layer provided on the surface side of the reflective layer, and having a light-transmitting property. A scattering panel provided on the surface side of the diffusion layer and facing the light diffusion layer is provided, and at least a part of the interval between the scattering panel and the reflection layer and the light diffusion layer is from one end side of the scattering panel. It has been proposed that the light source changes toward the other end side, the light source is provided on the one end side of the scattering panel, and is arranged in a posture that irradiates light toward the light diffusion layer and the scattering panel ( Patent Document 1).

According to such a lighting device, for example, the output of the orange light source in the light emitting module is set to a medium level, and the outputs of the white light source and the blue light source in the light emitting module are set to be lower than the medium level. In this case, in the scattering panel, bright orange light is emitted from the light emitting module side, and blue light that is gradually darkened with increasing distance from the light emitting module is emitted. That is, in the scattering panel 0, gradation light that changes from orange light to blue light gradually toward the center from one end side and the other end side of the scattering panel and changes so that the brightness also gradually becomes darker is emitted. The effect is that the actual sunset looks like it is spreading far away from the transparent plate.

However, such an illuminating device changes from orange light to blue light gradually from one scattering panel toward one end side and the other end side of the scattering panel toward the center, and also changes so as to become gradually darker in brightness. However, there is a problem that the brightness and the color tone cannot be changed unless the color tone and the light intensity of the light from the light source are changed.

JP, 2018-60624, A

Therefore, an object of the present invention is to provide an illumination device that can change the light intensity and color tone of light emitted from a light guide member without changing the light intensity and color tone of light from a light source.

The present invention adopts the following means in order to achieve the above-mentioned main object.

The lighting device according to the present invention is
A light source,
A light guide member having an entrance surface and an exit surface and causing Rayleigh scattering;
An angle adjusting device for changing the emitting direction of the light of the light source,
It is characterized by having.

According to the lighting device of the present invention, by changing the incident angle of light with respect to the light guide member that causes Rayleigh scattering, for example, when white light having various wavelengths of light is used as the light source, By changing the incident angle of light from the state in which light is incident perpendicularly to the light member, it is possible to provide an illuminating device that sequentially changes from blue light to red light from a position farther from the light source. That is, it is possible to provide an illumination device that can change the color tone of the light emitted from the light guide member without changing the color tone of the light of the light source itself.

Further, in the lighting device according to the present invention,
A light source,
A light guide member having an entrance surface and an exit surface and causing Rayleigh scattering;
An angle adjusting device for changing the emitting direction of light from the light source,
It may be characterized by having.

By arranging an angle adjusting device capable of changing the incident angle of light between the light source and the light guide member without moving the light source itself, the same effect as that of the above-described illumination device can be obtained.

Furthermore, in the lighting device according to the present invention, the light guide member is a light guide member in which particles having an average particle diameter of 5 nm or less are dispersed, a light guide member in which bubbles or liquid bubbles having an average bubble diameter of 5 nm or less are dispersed, It may be characterized by comprising any one of the light guide members in which crazes having an average width of 5 nm or less are formed.

Furthermore, in the lighting device according to the present invention,
The angle adjusting device, an emitting portion is formed on a part of the peripheral surface, the emitting portion is an optical fiber capable of transmitting light arranged so as to face the incident surface of the light guide member,
A rotating device capable of changing the angle of the optical fiber in the outer peripheral direction
May be provided.

Furthermore, in the lighting device according to the present invention,
The angle adjusting device includes an outer shell portion having a triangular cross section with an outer surface formed of a material that is transparent to light and bendable at a predetermined pressure, and a liquid that is light-transmissible and is enclosed in the outer shell portion. , May be included.

Furthermore, in the lighting device according to the present invention,
A pressurizing device capable of applying pressure to the outer shell portion,
By applying pressure by the pressurizing device, the emission direction of the light passing through the inside may be changed.

Furthermore, in the lighting device according to the present invention,
The angle adjusting device includes an optical path changing light guide member made of a resin capable of transmitting light, and a pressing member capable of applying pressure to the optical path changing light guide member,
By applying pressure to the optical path changing light guide member by the pressing member, the emission direction of the light passing through the inside may be changed.

Furthermore, in the lighting device according to the present invention,
Instead of the angle adjusting device, there is provided a light source position changing device that is capable of moving the light source horizontally to the entrance surface of the light guide member and in a direction vertical to the exit surface. It may be one.

FIG. 1 is a perspective view of an illumination device 100 according to the first embodiment. FIG. 2 is a side view of the lighting device 100 according to the first embodiment. FIG. 3 is a perspective view of the illumination device 101 according to the second embodiment. FIG. 4 is a partial side view of the illumination device 102 according to the third embodiment. FIG. 5 is a side view of the illumination device 103 according to the fourth embodiment. FIG. 6 is a side view of the lighting device 104 according to the fifth embodiment. FIG. 7 is a perspective view of the illumination device 105 according to the sixth embodiment. FIG. 8 is a schematic diagram showing a light incident state of the illumination device 105 according to the sixth embodiment.

Hereinafter, the lighting device 100 according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a lighting device 100 according to an embodiment of the present invention, and FIG. 2 is a side view of the lighting device 100 according to an embodiment of the present invention.

(First embodiment)
As shown in FIG. 1 or FIG. 2, the lighting device 100 according to the present invention mainly includes a light source 10, a light guide member 20 that receives light from the light source 10 and emits the light in a predetermined direction, and the light source 10. An angle adjusting device 30 that changes the emission direction of light.

The light source 10 is not particularly limited, and various light sources such as an LED, a fluorescent lamp, and a cold cathode fluorescent tube can be used, and the light source 10 is not particularly limited. As will be described later, since a material that causes Rayleigh scattering is used for the light guide member 20 in the present invention, when a white light source having a plurality of wavelengths is used, the color tone changes according to the distance from the light source 10, and thus a gradation effect is obtained. It can be used efficiently. On the other hand, when monochromatic light is used, the closer to the light source 10, the brighter and clearer the color tone can be expressed, and the farther from the light source 10, the darker the color tone can be expressed. In this embodiment, a plurality of white light emitting LEDs arranged in series on the LED substrate 11 is used as the light source 10. The LED substrate 11 is mounted inside a C-shaped steel having a C-shaped cross section, that is, a so-called C-shaped channel 15, and is configured so that light from the LED does not easily escape to the side surface side.

As the light guide member 20, the light guide member 20 that causes Rayleigh scattering is used. Examples of the light guide member 20 that causes Rayleigh scattering include those in which particles having an average particle diameter smaller than the wavelength of the incident light from the light source 10 are dispersed. As the particles, various materials such as metals, oxides or resins thereof, clay minerals, metal colloids are used, but the particles are not particularly limited. For example, a resin material or the like in which a highly permeable resin such as polycarbonate, PMMA, or polyethylene terephthalate is mixed and dispersed at 10% by weight or less can be used. In addition, air bubbles or liquid bubbles having an average bubble diameter smaller than the wavelength of the incident light from the light source 10 are dispersed, or crazes having an average width shorter than the wavelength of the incident light from the light source 10 are formed. Etc. In the case of particles or air bubbles or liquid bubbles, since the visible light is approximately 380 nm to 750 nm, it is preferable that the particles or air bubbles or liquid bubbles have an average particle size or average bubble diameter smaller than 100 nm, and in the case of crazes, the average It is preferable that the craze has a width narrower than 100 nm. More preferably, the average particle diameter, the average bubble diameter, and the average width are 5 nm or less. Rayleigh scattering is scattering that occurs when light hits an object smaller than the wavelength of light, and its scattering intensity increases as the wavelength decreases and decreases as the wavelength increases. Therefore, Rayleigh scattering has a property that short-wavelength blue light is easily scattered and long-wavelength red light is hardly scattered. Therefore, when white light in which light of all wavelengths of visible light is uniformly mixed is incident on the light guide member 20, the light source 10 side looks blue, and the portion far from the light source 10 side becomes red. Takes on the color tone of. In the case of monochromatic light, the color tone gradually decreases from the light source 10 side and the brightness becomes darker.

The light guide member 20 has an incident surface 21 on which the light from the light source 10 is incident and an emission surface 22 on which the light incident from the incident surface 21 is emitted. The exit surface 22 is formed as a non-parallel surface to the entrance surface 21. That is, since the present invention utilizes the change in the color tone of the light due to the portion near and far from the light source 10, the portion near and far from the incident surface 21 on which the light from the light source 10 is incident. It is formed so as to have a surface through which light is emitted from any of them. Preferably, it is formed on a surface having an angle of about 70° to 110° with respect to the incident surface 21. The light guide member 20 utilizes the fact that the light intensity and/or the color tone of the light incident from the incident surface 21 changes as the distance from the light source 10 increases. Therefore, if the emission surface 22 is too narrow, the effect of the present invention can be obtained. This is because it becomes difficult to fully exert the above.

A reflection plate 25 for reflecting light is provided on the surface of the light guide member 20 opposite to the emission surface 22. As the reflection plate 25, for example, a white plate, a milk half plate, or the like is used.

The angle adjusting device 30 is a device for changing the incident angle of light entering the light guide member 20 by changing the inclination of the light source 10 with respect to the incident surface 21 of the light guide member 20. In this embodiment, a device having a rotating mechanism (not shown) including an electric motor and a gear is provided at one end of the C-shaped channel 15 to which the LED substrate 11 is attached, and the forward/reverse rotation switch ( It is possible to change the angle of the light source 10 with respect to the incident surface 21 at an arbitrary angle (not shown).

The illumination device 100 manufactured as described above, when white light having various wavelengths of light is used for the light source 10, causes the light to enter perpendicularly to the incident surface 21 as shown in FIG. 2A. In such a case, the emission surface 22 on the side closer to the light source 10 emits a bluish white light having a stronger blue light, and the emission surface 22 emits a red light as the distance from the light source 10 side increases. The luminosity decreases as the distance increases. From this state, as shown in FIG. 2B, by making the incident direction of the light source 10 incident at an angle from the vertical direction with respect to the incident surface 21 of the light guide member 20, blue light is sequentially emitted from a position farther from the light source 10. Since the light is changed to red light, the lighting device 100 capable of emitting light having a strong reddish color can be obtained. Further, when monochromatic light is used for the light source 10, as shown in FIG. 2A, when light is incident perpendicularly to the incident surface 21, monochromatic light is emitted from the exit surface near the light source 10. Light with a strong tint of light is emitted strongly, and as the distance from the light source 10 increases, the tint becomes weaker and weak light is emitted. From this state, as shown in FIG. 2B, by making the incident direction of the light source 10 incident on the incident surface 21 of the light guide member 20 at an angle, the light reachable range of the light source 10 gradually reaches the light source 10. As it approaches, the part far from the light source 10 changes so as to become very dark.

(Second embodiment)
An illumination device 101 according to the second embodiment is shown in FIG. The illumination device 101 according to the second embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the angle adjusting device 30 and the point that the light guide member 20 is curved. Since it is the same as the lighting device 100 according to the first embodiment, the description of the other configurations is omitted. The angle adjusting device 30 according to the lighting device 101 according to the second embodiment is provided between the light source 10 and the light guide member 20 instead of changing the angle of the incident light by changing the angle of the light source 10 itself. The angle is adjusted by the angle adjusting device 30 including the optical fiber 31 and the rotating device 50. As shown in FIG. 3, the angle adjusting device 30 according to the second embodiment includes an optical fiber 31 that can transmit light between the light source 10 and the light guide member 20, and a rotating device 50 that rotates the optical fiber 31. have. The optical fiber 31 has a light emitting portion 31a formed in one direction along the longitudinal direction, the light emitting portion 31a being formed on an uneven surface or a rough surface from which light can be emitted from part of the outer peripheral surface. The emitting portion 31 a is arranged so as to face the incident surface 21 of the light guide member 20. Therefore, the light that has entered the end surface of the optical fiber 31 from the light source 10 is emitted from a part of the outer peripheral surface of the optical fiber 31 toward the incident surface 21 of the light guide member 20. A turning device 50 having a turning mechanism composed of an electric motor and gears is provided at the end of the optical fiber 31 opposite to the light source 10, and the optical fiber 31 is moved by the forward/reverse rotation switch. The light source 10 can be rotated in the outer peripheral direction, whereby the angle of the light source 10 with respect to the incident surface 21 can be changed at any angle.

According to the illuminating device 101 of the second embodiment, as in the case of the first embodiment, when white light having various wavelengths of light is used, the incident angle of the light emitted from the optical fiber 31 is set to the incident surface 21. When light is incident perpendicularly to, the light emitting surface 22 on the side closer to the incident surface 21 emits bluish white light having a stronger blue light, and the farther from the incident surface 21 side, the light having a stronger red light becomes. The emitted light has a gradation shape, and the light intensity decreases as the distance increases. From this state, while rotating the optical fiber 31 in the outer peripheral direction around the longitudinal axis, the light is incident on the incident surface 21 at an angle with respect to the incident surface 21 of the light guide member 20. The red light gradually changes from the distant position so as to approach the incident surface 21 side, and thus the lighting device 100 capable of emitting the light having a stronger reddish color can be obtained.

According to the illuminating device 101 of the second embodiment, since the optical fiber 31 is used to emit the light incident on the incident surface 21, it is possible to reduce the possibility that the light will be emitted from other than the emitting portion 31a. it can. Therefore, as compared with the case where the LED is directly used, less light escapes to the side, so that it is possible to reduce the need to cover the surroundings. Therefore, the C-shaped channel 15 can be omitted.

Further, according to the illuminating device 101 of the second embodiment, since the optical fiber 31 is used to emit the light incident on the incident surface 21, it is possible to prevent the light guiding member 20 from being curved as shown in FIG. Even when the incident surface 21 is curved, the optical fiber 31 can be installed along the incident surface 21. Further, since the optical fiber 31 can be rotated even in a curved state, the incident angle can be freely changed.

(Third Embodiment)
An illumination device 102 according to the third embodiment is shown in FIG. The illumination device 102 according to the third embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the angle adjusting device 30 and the light guide member 20, and other configurations are the illumination device according to the first embodiment. Since it is the same as 100, the description of other configurations is omitted. The angle adjusting device 30 according to the lighting device 102 according to the third embodiment is provided between the light source 10 and the light guide member 20 instead of changing the angle of the light source 10 itself. In the angle adjusting device 30 according to the third embodiment, light can be transmitted into a cylindrical closed outer shell part 33 made of a plastic film or plate so that the outer cross section has a triangular shape. The liquid 34 is enclosed. The angle adjusting device 30 having such a configuration allows light to pass through the angle adjusting device 30 and emit the light at different angles like a prism. That is, the light source 10 is arranged so as to face one surface (33a in the present embodiment) of the three surfaces (33a, 33b, 33c) formed by the outer shell portion 33, and one of the remaining two surfaces. (33c in this embodiment) is arranged so as to face the incident surface 21 of the light guide member 20, and the light incident from the light source 10 is reflected by the surface 33b and is incident on the incident surface 21 via the angle adjusting device 30. Is emitted. The angle adjusting device 30 is provided with a turning device (not shown). By changing the angle of the angle adjusting device 30 by the turning device, the incident angle of light on the incident surface 21 can be changed. it can. As a result, the same effect as that of the lighting device 100 according to the first embodiment can be obtained.

By adopting such a configuration, similarly to the first embodiment, when the light emitted from the angle adjusting device 30 is incident perpendicularly to the incident surface 21, the incident surface 21 is exposed to the incident surface 21 side. Blue light is emitted from the near exit surface 22, red light is emitted as the distance from the entrance surface 21 side is increased, and the light intensity is reduced in a gradation manner as the distance is increased. From this state, by making the incident direction of the light incident on the incident surface 21 of the light guide member 20 at an angle, the blue light is changed from the position closer to the light source to the red light. The lighting device 100 can emit reddish light.

Further, the angle adjusting device 30 is provided with a pressurizing device (not shown). When pressure is applied to a part of the angle adjusting device 30 by the pressurizing device, as shown in FIG. The light incident surface 33 a and the light emitting surface 33 c of the angle adjusting device 30 are curved by the pressure of 34. By thus forming the light incident surface 33a and the light emitting surface 33c as curved surfaces, the light emitting direction becomes complicated, and light having a complicated gradation can be emitted from the light guide member 20.

(Fourth Embodiment)
An illumination device 103 according to the fourth embodiment is shown in FIG. The illumination device 103 according to the fourth embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the angle adjusting device 30 and the light guide member 20, and other configurations are the illumination device according to the first embodiment. Since it is the same as 100, the description of other configurations is omitted.

The angle adjusting device 30 according to the illumination device 103 according to the fourth embodiment is provided between the light source 10 and the light guide member 20 instead of changing the angle of the light source 10 itself. In the angle adjusting device 30 according to the third embodiment, a mirror is arranged and a rotating device (not shown) is provided so as to be rotatable as in the first embodiment. Therefore, the same effect as that of the first embodiment can be obtained by changing the angle of the mirror.

(Fifth Embodiment)
An illumination device 104 according to the fifth embodiment is shown in FIG. The illumination device 104 according to the fifth embodiment is different from the illumination device 100 according to the first embodiment in the configuration of the angle adjusting device 30 and the light guide member 20, and other configurations are the illumination device according to the first embodiment. Since it is the same as 100, the description of other configurations is omitted.

The angle adjusting device 30 according to the illumination device 104 according to the fifth embodiment is provided between the light source 10 and the light guide member 20 instead of changing the angle of the light source 10 itself. As shown in FIG. 6A, the angle adjusting device 30 according to the fifth embodiment is an optical path made of resin between the light source 10 of the LED substrate 11 attached to the C-shaped channel 15 and the incident surface 21 of the light guide member 20. The changing light guide member 35 and the pressing member 36 that can press the optical path changing light guide member 35 in a direction substantially perpendicular to the optical path direction.

As shown in FIG. 6B, the angle adjusting device 30 applies a pressure to the optical path changing light guide member 35 by the pressing member 36, thereby changing the bending rate due to the compression of the material, thereby changing the light emission angle. Will be. As a result, the same effect as that of the first embodiment can be obtained.

(Sixth Embodiment)
An illumination device 105 according to the sixth embodiment is shown in FIG. The illumination device 105 according to the sixth embodiment is provided with a light source position changing device 37 in place of the angle adjusting device 30 in the illumination device 100 according to the first embodiment. Since other configurations are similar to those of the lighting device 100 according to the first embodiment, description of the other configurations will be omitted.

In the sixth embodiment, the light source 10 that emits diffused light is used. In the case of a light source composed of diffused light, light is emitted at various angles, so even when the light source is moved horizontally with respect to the incident surface 21 of the light guide member 20, as shown in FIGS. 8A and 8B. The angle at which the light emitted from 10 is incident on the incident surface 21 can be changed. Therefore, in place of the angle adjusting device 30, the light source 10 is moved in the direction (horizontal direction A shown in FIG. 7) which is horizontal to the incident surface 21 of the light guide member 20 and vertical to the emission surface 22. A light source position changing device 37 capable of performing the above is provided.

As shown in FIGS. 8A and 8B, the light source position changing device 37 changes the emission angle of light by moving the position of the light source 10 and in the direction perpendicular to the emission surface 22. As a result, the same effect as that of the first embodiment can be obtained.

The lighting devices 100 to 105 according to the first to sixth embodiments described above can be used, for example, as a lighting device installed in the interior of a house or the like. When used for the interior of a house or the like, the color tone of the indoor illumination can be changed by changing the incident angle of light according to the brightness of the outdoors.

Further, the lighting devices 100 to 105 according to the first to sixth embodiments described above can be used as an interior member of an automobile or the like. For example, by installing it on the instrument panel, door trim, roof liner, scuff plate, etc., it is possible to reversibly obtain red to blue light emission by changing the incident angle of light. Then, the atmosphere can be changed by changing the shade depending on the time of day.

It should be noted that the present invention is not limited to the above-described embodiments, and may be implemented in various modes as long as they are within the technical scope of the present invention.

Other angle adjustment devices may be used in the embodiments described above. That is, as long as the incident angle of light with respect to the incident surface 21 of the light guide member 20 can be changed, devices having various configurations can be used.

Further, in the above-described embodiment, the light guide member 20 itself may be designed. For example, a pigment may be mixed in the light guide member, a lame material may be added, or a transfer film having a design on the surface may be attached.

As shown in the above-described embodiment, it can be used as a lighting device installed in the interior of a house or the like.

10... Light source, 11... LED substrate, 15... C type channel, 20... Light guide member, 21... Incident surface, 22... Emitting surface, 25... Reflector, 30... Angle adjusting device, 31... Optical fiber, 31a... Emitting part , 33... Outer shell part, 33a... Light incident surface, 33b... Surface, 33c... Light emitting surface, 34... Liquid, 35... Optical path changing light guide member, 36... Pressing member, 37... Light source position changing device, 50... Rotating device, 100... Illumination device, 101... Illumination device, 102... Illumination device, 103... Illumination device, 104... Illumination device, 105... Illumination device

Claims (8)

A light source,
A light guide member having an entrance surface and an exit surface and causing Rayleigh scattering;
An angle adjusting device for changing the emitting direction of the light of the light source,
An illuminating device comprising: A light source,
A light guide member having an entrance surface and an exit surface and causing Rayleigh scattering;
An angle adjusting device for changing the emitting direction of light from the light source,
An illuminating device comprising: The light guide member includes a light guide member in which particles having an average particle diameter of 5 nm or less are dispersed, a light guide member in which bubbles or liquid bubbles having an average bubble diameter of 5 nm or less, and a craze having an average width of 5 nm or less are formed. The lighting device according to claim 1, wherein the lighting device comprises any one of the above light guide members. The angle adjusting device, an emitting portion is formed on a part of the peripheral surface, the emitting portion is an optical fiber capable of transmitting light arranged so as to face the incident surface of the light guide member,
A rotating device capable of changing the angle of the optical fiber in the outer peripheral direction
The lighting device according to claim 2, further comprising: The angle adjusting device includes an outer shell part having a triangular cross section with an outer surface formed of a material that is transparent to light and can be bent at a predetermined pressure, and a light-permeable liquid enclosed in the outer shell part. The lighting device according to claim 2 or 3, wherein the lighting device comprises: A pressurizing device capable of applying pressure to the outer shell portion,
The illumination device according to claim 5, wherein the emission direction of the light passing through the inside is changed by applying pressure by the pressurizing device. The angle adjusting device includes an optical path changing light guide member made of a resin capable of transmitting light, and a pressing member capable of applying pressure to the optical path changing light guide member,
4. The illumination device according to claim 2, wherein the pressing member applies pressure to the optical path changing light guide member to change the emission direction of the light that has passed through the inside. .. Instead of the angle adjusting device, there is provided a light source position changing device that is capable of moving the light source horizontally to the entrance surface of the light guide member and in a direction vertical to the exit surface. The lighting device according to claim 1.

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