JP2014130692A - Lighting module and lighting apparatus with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting module capable of controlling outgoing light according to a use style, and a lighting apparatus with the same.SOLUTION: A lighting module includes a light source, a light guide, and a transmissivity modulation member. The light source is arranged on an incident surface provided at an end side of the light guide. The light guide has an emission surface from which the light made incident from the incident surface is emitted. The transmissivity modulation member is provided opposite a part of the emission surface, and can modulate the transmissivity.

Description

  The present invention relates to an illumination module used as illumination, and more particularly to an illumination module that includes a light source and a light guide plate, and that emits light from the light source through a light guide plate from a light emitting surface, and an illumination device using the same.

  In recent years, lighting devices are required to have energy saving performance, light amount adjustment function, light color adjustment function, and design. For this reason, the light source of the illuminating device is being replaced by LED (Light Emitting Diode) instead of the conventional filament type light bulb and fluorescent lamp.

  In recent years, various thin lighting devices using a light guide have been proposed. For example, Patent Document 1 discloses a light guide-type illumination device that outputs light from a light source via a light guide made of a transparent material. FIG. 6 is an explanatory diagram showing an outline of a lighting fixture according to Patent Document 1. As shown in FIG. A fixture main body 101 fixed to the ceiling surface, and a light guide 103 that is optically coupled to the light emitting diode 102 and is pivotally connected to the fixture main body 101 so as to change the light emitting direction of the light emitting diode 102. With. The light distribution can be easily changed by changing the direction of the light guide 103 with respect to the instrument body 101. Further, Patent Document 1 is configured such that light from the light emitting diode 102 is emitted to the other surface side by providing a reflective layer made of, for example, silver plating and reflecting light on one surface of the light guide 103. It is stated that there is.

JP 2007-80539 A (published March 29, 2007)

  However, as in Patent Document 1, a light guide provided with a reflective layer can concentrate light in the floor direction, but since there is no transmitted light upward, the entire room cannot be brightened. .

  In addition, in a lighting device that does not have a reflective layer, the entire room can be brightened by the transmitted light upward, but light is scattered throughout the room when you want to have a lower brightness, such as when eating, working, or reading. As a result, there was a problem that sufficient lighting could not be achieved.

  This invention is made | formed in view of such a subject, The objective is to implement | achieve the illumination module which can control emitted light according to a usage condition.

  An illumination module according to the present invention is an illumination module including a light source, a light guide, and a transmittance modulation member, and the light source is disposed on an incident surface provided on an end side of the light guide. Has an exit surface that emits light incident from the entrance surface, and the transmittance modulation member is provided relative to a part of the exit surface and can modulate the transmittance.

  Further, the transmittance modulation member may have a transmissive state and a reflective state, and can be switched between the states. Further, the transmittance modulation member may have a state in which a part of light from the emission surface is transmitted and other light is reflected. Further, the transmittance modulation member may be characterized by using liquid crystal.

  According to the present invention, the emitted light can be controlled according to the usage mode.

1 is a perspective view of a lighting device according to Embodiment 1. FIG. It is sectional drawing of the illuminating device which concerns on Embodiment 1. FIG. It is a figure explaining the state of the illumination module which concerns on Embodiment 1. FIG. It is a perspective view of the illuminating device which concerns on Embodiment 2. FIG. It is a figure explaining the state of the illumination module which concerns on Embodiment 2. FIG. It is explanatory drawing which shows the outline of the lighting fixture which concerns on patent document 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts.

Embodiment 1
In Embodiment 1, a suspended illumination device will be described as an example of the illumination device according to the present invention. In the following, for the sake of convenience, the floor surface direction will be described as the main irradiation direction and the ceiling surface direction will be described as the sub-irradiation direction for the lighting device.

  Based on FIG. 1 and FIG. 2, the illuminating device which concerns on Embodiment 1 is demonstrated. FIG. 1 is a perspective view of the lighting device 1 according to the first embodiment, and FIG. 2 is a cross-sectional view of the lighting device 1.

  The illuminating device 1 is a so-called pendant light that is suspended from the ceiling surface 2. The lighting device 1 includes a power box 10, an electric wire 20, and a lighting fixture body 30.

  The power supply box 10 is installed on the ceiling surface 2 and includes a power supply board (not shown) for AC-DC conversion and a control unit 11. The control unit 11 is a processing unit that controls the lighting fixture body 30.

  The electric wire 20 connects the power supply box 10 and the luminaire main body 30, and suspends the luminaire main body 30 from the power supply box 10. The electric wire 20 supplies power from the power supply box 10 to the lighting fixture body 30.

  The lighting fixture main body 30 is composed of a plurality of lighting modules 31, and in the first embodiment, two lighting modules 31 are connected. The luminaire main body 30 is suspended and supported by the electric wires 20 connected to the power supply box 10. The luminaire main body 30 is disposed substantially parallel to the ceiling surface 2 and the floor surface.

  The illumination module 31 includes an LED 32 that is a light source, a light guide plate 33, a transmittance modulation member 34, and a holding member 35. The holding member 35 holds the LED 32, the light guide plate 33, and the transmittance modulation member 34.

  Next, based on FIG. 3, the structure of the illumination module 31 which concerns on Embodiment 1 is demonstrated. FIG. 3 is a cross-sectional view illustrating an example of the illumination module 31 according to the first embodiment. FIG. 3A illustrates a case where the transmittance modulation member 34 is in a reflective state, and FIG. The case where the transmittance | permeability modulation | alteration member 34 is a permeation | transmission state is shown.

  The LED 32 is a light source in the lighting device 1. The LED 32 has a configuration in which a plurality of LED chips electrically connected to an LED substrate are mounted, and is simply shown in the drawing. Here, the LED substrate and the LED chip are collectively referred to as an LED. The LED 32 is connected to the control unit 11, and lighting / non-lighting is controlled by the control unit 11.

  The light guide plate 33 is a light guide that couples the light emitted from the LEDs 32, and the LEDs 32 are arranged apart from the incident surface provided on the end side of the light guide plate 33. The light guide plate 33 is substantially orthogonal to the incident surface 33a and the incident surface 33a facing the LED 32, and faces the first emitting surface 33b, the second emitting surface 33c, and the incident surface 33a facing the floor surface or the ceiling surface. It has a reflecting surface 33d. The incident surface 33 a is provided on the end side of the light guide plate 33. The first emission surface 33b and the second emission surface 33c are total reflection surfaces for guiding the light incident from the incident surface 33a into the light guide plate 33, and emit light in the main irradiation direction and the sub irradiation direction. It is also the exit surface. The reflection surface 33d is a surface that reflects light that has been guided through the light guide plate 33 without being emitted from the first emission surface 33b or the second emission surface 33c.

  The light guide plate 33 is made of a transparent material such as acrylic, polycarbonate, polystyrene, glass or the like. In addition, the light guide plate 33 has a plate shape and a quadrangular shape in the present embodiment, but is not limited thereto, and may be a polygonal shape or a circular shape. Further, the light guide plate 33 is preferably one in which a diffusion material 36 is dispersed inside the light guide plate 33 in order to extract light. In the specification of the present application, the light guide plate 33 is assumed to be Delaglass (registered trademark) AL995 manufactured by Asahi Kasei Co., Ltd., which is a light guide in which a diffusion material 36 for extracting light is dispersed. By using such a light guide plate 33, the lighting device 1 becomes a surface-emitting light source that does not impair transparency. That is, the illuminating device 1 functions as a surface emitting light source when the LED 32 is lit, and transparency is maintained when the LED 32 is not lit.

  The light emitted from the LED 32 enters the light guide plate 33 from the incident surface 33 a of the light guide plate 33 facing the LED 32. The light incident on the light guide plate 33 is guided through the light guide plate 33 while repeating total reflection on the first emission surface 33 b and the second emission surface 33 c of the light guide plate 33.

  When the light guided inside the light guide plate 33 collides with the diffusion material 36, the light is diffused and the angle of traveling through the light guide plate 33 is changed. As a result, the total reflection condition is broken, and the light is emitted from the first emission surface 33b or the second emission surface 33c. Thus, the light that guides the inside of the light guide plate 33 is scattered during the light guide and is emitted from the first emission surface 33b or the second emission surface 33c.

  However, not all the light that guides the inside of the light guide plate 33 is emitted from the first emission surface 33b or the second emission surface 33c, and a part of the light is a reflection that is a surface facing the incidence surface 33a. The surface 33d is reached. The light reaching the reflection surface 33d is reflected by the reflection surface 33d, guided again through the light guide plate 33, scattered during the light guide, and emitted from the first emission surface 33b or the second emission surface 33c.

  As described above, the light is guided by using the light guide plate 33, and the diffuser 36 is uniformly distributed in the light guide plate 33, thereby enabling surface emission illumination. Furthermore, it is possible to efficiently extract light by reflecting light that has not been emitted from the light guide plate 33 and has reached the opposite side of the incident surface.

  In the first embodiment, the light is emitted mainly from the first emission surface 33b and the second emission surface 33c. However, in the illuminating device 1, a surface other than the incident surface 33a can be used as a light emitting surface. In this case, light can be extracted efficiently and light can be distributed over all directions.

  Moreover, although the reflective surface 33d is formed in parallel with the incident surface 33a in Embodiment 1, it is not restricted to this. For example, the reflecting surface 33d may be formed as an inclined surface or a curved surface that is inclined with respect to the incident surface 33a so as to reflect the guided light and emit it in the main irradiation direction.

  In addition, a diffusing material or the like may be printed on the first emission surface 33b and the second emission surface 33c of the light guide plate 33 in order to extract light that guides the light guide plate 33, and an uneven shape is provided. Also good. By forming a light extraction pattern on the first emission surface 33b and the second emission surface 33c of the light guide plate 33, light can be extracted from the first emission surface 33b and the second emission surface 33c. In addition, when the light extraction pattern is formed, it is possible to select a material for the light guide plate 33 other than that containing the diffusion material, and it is possible to increase the product lineup.

  The transmittance modulation member 34 is provided relative to a part of the exit surface of the light guide plate 33, and can modulate the transmittance of the emitted light. In the first embodiment, the transmittance modulation member 34 is attached at a position facing the second emission surface 33c, has a transmission state and a reflection state, and can be switched between the states. The reflection includes reflection due to scattering. The transmittance modulation member 34 is connected to the control unit 11, and the control unit 11 controls the state of the transmittance modulation member 34.

  Hereinafter, a specific example of the transmittance modulation member 34 will be described.

  For example, the transmittance modulation member 34 may use a liquid crystal system of PDLC (Polymer Dispersed Liquid Crystal) or PNLC (Polymer Network Liquid Crystal). PDLC and PNLC are technologies that can control the alignment of liquid crystal by applying a voltage. When a voltage is applied, the liquid crystal aligns and transmits light, and when no voltage is applied, the liquid crystal is arranged randomly. Scatter light. Further, the light transmittance can be controlled by the magnitude of the applied voltage. Moreover, since the transmittance | permeability modulation | alteration member 34 which consists of PDLC and PNLC is transparent when it is a transmission state, the illuminating device 1 has a transparent feeling and can provide high design property. A cholesteric liquid crystal is preferably used for the liquid crystal element. Since the cholesteric liquid crystal has reflectivity, the reflection and transmission of light can be controlled by the applied voltage.

  Further, the transmittance modulation member 34 may be one using a micro electro mechanical system (MEMS) shutter technology. The MEMS shutter is a minute shutter that controls physical opening and closing by application of a voltage, and switches between a transmission state and a reflection state by opening and closing. The transmittance modulation member 34 may be composed of a plurality of MEMS shutters, and all the shutters open and close at the same time. It is also possible to control the light transmittance by controlling the ratio of the open and closed shutters.

  Further, the transmittance modulation member 34 may use an electrowetting technique. The electrowetting technique is a technique for moving a liquid that reflects light by applying a voltage. When a voltage is applied, the liquid is collected in one place so that light is transmitted, and when no voltage is applied, Reflects light because it is spreading. Further, since the transmittance modulation member 34 by the electrowetting technique is transparent when in the transmissive state, the lighting device 1 has a sense of transparency and can provide high design.

  The holding member 35 holds the LED 32, the light guide plate 33, and the transmittance modulation member 34. In the first embodiment, one holding member 35 holds two LEDs 32 inside, and supports the light guide plate 33 and the transmittance modulation member 34 for each LED 32 in a cantilever manner. For this reason, the number of members of the lighting device 1 can be reduced.

  Since the LED 32 generates heat when it is turned on, the holding member 35 preferably has a role of radiating the heat of the LED 32 to the outside. For example, the material of the holding member 35 is preferably a metal material having high thermal conductivity, such as aluminum. Moreover, the holding member 35 can also be comprised from the resin material etc. which enabled it to ensure heat dissipation and intensity | strength. Thus, heat generated when the LED 32 is turned on is radiated to the outside through the holding member 35. That is, the holding member 35 functions as a heat sink for the LED 32. Note that the shape of the holding member 35 may be determined in consideration of design and the like.

  Further, since the holding member 35 holds one end of the light guide plate 33, part of the first emission surface 33 b and the second emission surface 33 c exists inside the holding member 35. However, when light is emitted within the holding member 35, the target irradiation region cannot be irradiated. For this reason, it is desirable that the first emission surface 33 b and the second emission surface 33 c are not formed in a region inside the holding member 35. Thereby, the light utilization efficiency can be improved.

  Next, the state of the illumination module 31 in each situation when the transmittance modulation member 34 is in the reflective state and when it is in the transmissive state will be described with reference to FIGS.

  As described above, the light that has entered the light guide plate 33 from the LED 32 is emitted from the first emission surface 33 b or the second emission surface 33 c by guiding the inside of the light guide plate 33 and colliding with the diffusion material 36. The light emitted from the first emission surface 33b irradiates the floor surface in the main irradiation direction. On the other hand, the light emitted from the second emission surface 33 c has different behavior depending on the state of the transmittance modulation member 34.

  When the transmittance modulation member 34 is in the reflective state, the light emitted from the second emission surface 33c is reflected by the transmittance modulation member 34 and returned to the inside of the light guide plate 33 as shown in FIG. Thus, the light is emitted from the first emission surface 33b. Therefore, most of the light emitted from the illumination module 31 is emitted from the first emission surface 33b and irradiates the main irradiation direction. For this reason, it becomes possible to brighten the floor surface intensively and efficiently, which is effective when working, reading, or the like under the lighting device.

  On the other hand, when the transmittance modulation member 34 is in the transmissive state, the light emitted from the second emission surface 33c passes through the transmittance modulation member 34 as shown in FIG. 3B, and passes through the ceiling surface in the main irradiation direction. Irradiate. For this reason, it becomes possible to irradiate the whole space with the illuminating device 1, and it becomes effective when relaxing like indirect illumination.

  Further, the transmittance modulation member 34 may have a state of transmitting some light and reflecting other light. That is, it means a state in which the transmittance of the transmittance modulation member 34 is larger than 0% and smaller than 100%. For convenience, when the ratio of the light emitted from the first emission surface 33b and the second emission surface 33c of the light guide plate 33 is 50:50, when the transmittance modulation member 34 is in a reflective state as shown in FIG. The ratio of the light that irradiates the main irradiation direction and the sub irradiation direction is 100: 0, and the light that irradiates the main irradiation direction and the sub irradiation direction when the transmittance modulation member 34 is in the transmissive state as shown in FIG. The ratio is 50:50. On the other hand, when the transmittance modulation member 34 is in a state of transmitting a part of the light and reflecting the other light, the ratio of the light irradiating the main irradiation direction and the sub irradiation direction is set to 50:50 to 100: It can be set between 0. Furthermore, by making it possible to arbitrarily control the transmittance of the transmittance modulation member 34, the ratio of light that irradiates the main irradiation direction and the sub-irradiation direction is arbitrarily set between 50:50 and 100: 0. It becomes possible to do. By comprising as mentioned above, the brightness and atmosphere of space can be adjusted according to a use aspect.

[Embodiment 2]
In the first embodiment, an example of a hanging type lighting device suspended from a ceiling surface has been described. In the second embodiment, an example of an embedded type lighting device embedded in a wall surface or a ceiling of a building will be described. In the following, for convenience, the indoor direction is described as the main irradiation direction, and the outdoor direction is described as the sub-irradiation direction.

  Based on FIG. 4 and FIG. 5, the illuminating device which concerns on Embodiment 2 is demonstrated. FIG. 4 is a perspective view of the lighting device 1a according to the second embodiment, and FIG. 5 is a cross-sectional view of the lighting device 1a.

  The lighting device 1a is an embedded lighting device embedded in a wall surface of a building. The illumination device 1a includes an illumination module 31, and the illumination module 31 includes an LED 32 that is a light source, a light guide plate 33, a transmittance modulation member 34, and a holding member 35, as in the first embodiment.

  The holding member 35 is a wall surface of a building, for example. The holding member 35 surrounds the light guide plate 33 and the transmittance modulation member 34 from four directions. The LED 32, the light guide plate 33, and the transmittance modulation member 34 are arranged so that the light guide plate 33 faces the indoor direction and the transmittance modulation member 34 faces the outdoor direction. Hold.

  Although the power supply box and the electric wire are not shown, the power supply box including the power supply board and the control unit is installed in the wall or on the wall surface, and the electric wire is embedded in the wall, and connects the power supply box and the lighting module 31. Then, power is supplied to the lighting module 31.

  In addition, about each part which comprises the illuminating device 1a, since it has a function and role substantially the same as Embodiment 1, detailed description is abbreviate | omitted.

  Next, the state of the illumination module 31 in each situation when the transmittance modulation member 34 is in the reflective state and when it is in the transmissive state will be described with reference to FIG. FIG. 5 is a diagram illustrating the state of the illumination module 31 according to the second embodiment. FIG. 5A illustrates a case where the transmittance modulation member 34 is in a reflective state, and FIG. The case where the rate modulation | alteration member 34 is a permeation | transmission state is shown.

  Similar to the first embodiment, the light incident on the light guide plate 33 from the LED 32 is guided from the first light output surface 33b or the second light output surface 33c by guiding the inside of the light guide plate 33 and colliding with the diffusing material. The The light emitted from the first emission surface 33b irradiates the room in the main irradiation direction. On the other hand, the light emitted from the second emission surface 33 c has different behavior depending on the state of the transmittance modulation member 34.

  When the transmittance modulation member 34 is in the reflecting state, the light emitted from the second emission surface 33c is reflected by the transmittance modulation member 34 and returned to the inside of the light guide plate 33 as shown in FIG. Thus, the light is emitted from the first emission surface 33b. Therefore, most of the light emitted from the illumination module 31 is emitted from the first emission surface 33b and irradiates the main irradiation direction. For this reason, it becomes possible to brighten the room intensively and efficiently. Further, when the transmittance modulation member 34 is in a reflective state, it becomes possible to block light and line of sight from the outside.

  When the transmittance modulation member 34 is in the transmissive state, the light emitted from the second emission surface 33c is transmitted through the transmittance modulation member 34 as shown in FIG. For this reason, the light emission of the illumination module 31 can be visually recognized even from outside, and it can be expected to produce an appearance with excellent design. Further, when the transmittance modulation member 34 is in a transmissive state, an effect of improving the temperature and illuminance in the room by taking in outside light and an effect of enabling observation of the room from the room are expected.

  Since it has the above-described function, it is possible to capture outside light while using the transmittance modulation member 34 in a transmissive state during the daytime and use it as illumination, so that an open atmosphere can be realized in the room. At night, the transmittance modulation member 34 is in a reflective state, and the room can be irradiated with high efficiency while blocking the light and line of sight from the outside. Therefore, a calm atmosphere can be realized in the room.

  Also in the second embodiment, similarly to the first embodiment, the transmittance modulation member 34 may have a state of transmitting some light and reflecting other light.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, The range of this invention is shown by a claim, and the meaning and range equivalent to a claim All changes within are intended to be included.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in design property and can provide the high performance illumination module which can control an emitted light according to a use aspect. This illumination module can be applied to an illumination device as a single product or in combination. Specifically, it is effective to apply to various illumination devices such as a pendant light, a ceiling light, or a wall surface illumination. By applying to such a lighting device, it is possible to realize high design and power saving of the device.

DESCRIPTION OF SYMBOLS 1 Lighting apparatus 1a Lighting apparatus 2 Ceiling surface 10 Power supply box 11 Control part 20 Electric wire 30 Lighting fixture main body 31 Lighting module 32 LED
33 Light guide plate 33a Incident surface 33b First exit surface 33c Second exit surface 33d Reflective surface 34 Transmittance modulation member 35 Holding member 36 Diffusing material

Claims (5)

An illumination module comprising a light source, a light guide, and a transmittance modulation member,
The light source is disposed on an incident surface provided on an edge of the light guide;
The light guide has an exit surface that emits light incident from the entrance surface;
The illumination module according to claim 1, wherein the transmittance modulation member is provided relative to a part of the emission surface and can modulate the transmittance.   The illumination module according to claim 1, wherein the transmittance modulation member has a transmission state and a reflection state, and is switchable between the states.   The illumination module according to claim 1, wherein the transmittance modulation member has a state of transmitting a part of light from the emission surface and reflecting other light.   The illumination module according to claim 1, wherein the transmittance modulation member uses liquid crystal.   The illuminating device provided with the illumination module of any one of Claims 1-4.