JP2014072007A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device that makes it possible to reduce the size of a filter while preventing deterioration of designability of the illumination device due to the filter.SOLUTION: An illumination device includes a semiconductor light-emitting element 21a, a light guide plate 22 in which an edge face 22a as a light incident end face on the periphery receives light emitted from the semiconductor light-emitting element 21a, and a filter 23 having a light color layer as an electrochemical responsive material layer. The filter 23 is provided between the semiconductor light-emitting element 21a (light source 21) and the light guide plate 22.

Description

  The present invention relates to a lighting device.

  For lighting devices used in offices, ordinary homes, commercial facilities, etc., it is desired to change the light color of the illumination light in accordance with the application. For example, several types of fluorescent lamps with different color temperatures are sold. However, in such a lighting device, since the color temperature is fixed for each product, it is difficult to change the color temperature to a user's desired color temperature.

  On the other hand, a lighting device that includes a light source and a filter having an electrochemically responsive material layer (a layer containing an electrochromic material) between the light source and an irradiation target, and arbitrarily changes the color temperature of the irradiation light. Have also been developed (see, for example, Patent Documents 1 and 2). In such an illuminating device, for example, voltage is applied to a filter having an electrochemically responsive material layer to perform decoloring or color development and change the color temperature.

JP-A-4-133204 JP-A-6-116615

  By the way, in the illuminating device as described above, since the filter is provided on the front surface of the outer casing, the filter is visually recognized by a user or the like in the environment where the light is radiated, and in terms of the design of the illuminating device. There is room for improvement. In addition, if the filter is disposed so as to close a housing opening of a large lighting device such as a ceiling light or a base light, the filter inevitably increases in size, and there is room for improvement in this respect. It was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting device that can reduce the size of the filter while suppressing deterioration in design of the lighting device due to the filter. is there.

  In order to solve the above problems, an illumination device includes a semiconductor light emitting element, a light guide plate on which light emitted from the semiconductor light emitting element is incident on a light incident end surface of an outer peripheral portion, and the semiconductor light emitting element and the light guide plate between And a filter having an electrochemically responsive material layer to be provided.

  Moreover, in the said structure, it is preferable to provide the light transmissive member which has a softness | flexibility in the at least one between the said filter and a light-guide plate, and the said semiconductor light-emitting device and the said filter.

In the above configuration, it is preferable that the light transmissive member provided at least between the filter and the light guide plate has a visible light transmittance of 80% or more.
In the above-described configuration, it is preferable that at least the light transmission member provided between the semiconductor light emitting element and the filter has a light collecting property.

In the above configuration, the light transmitting member is preferably made of a material having a Shore A hardness of 60 or less.
In the above structure, the filter preferably contains a Prussian blue-type metal complex in the electrochemically responsive material layer.

  ADVANTAGE OF THE INVENTION According to this invention, size reduction of a filter is attained, suppressing the deterioration of the designability of the illuminating device by a filter.

It is a perspective view of the illuminating device in embodiment. It is sectional drawing of the illuminating device in the same as the above. It is a schematic block diagram of the filter of the illuminating device same as the above. It is sectional drawing of the illuminating device in another example. It is sectional drawing of the illuminating device in another example. It is a perspective view of the light transmissive part of the illuminating device same as the above. It is a top view of the light transmissive part of the illuminating device in the same as the above. It is a schematic block diagram of the illuminating device in another example. It is a schematic block diagram of the illuminating device in another example.

Hereinafter, an embodiment of a lighting device will be described with reference to the drawings.
As shown in FIG.1 and FIG.2, the illuminating device 10 of this embodiment is a room lamp attached to the wiring fixture W provided in the indoor ceiling R, and is what is called a square type ceiling light. The lighting device 10 is attached to the wiring device W via an adapter AD attached to the housing 11.

  As shown in FIG. 2, the casing 11 of the lighting device 10 includes a bottomed cylindrical first casing 12 and an opening 12 b formed in the bottom 12 a on the rear surface (interior ceiling R) side of the first casing 12. And a second housing 13 that closes the door.

  As shown in FIG. 2, the first housing 12 has a substantially rectangular tube shape with a wall portion 12 c having a side of about 500 mm, and has openings 12 b and 12 e in the bottom portions 12 a and 12 d on the rear side and the front side. The second casing 13 is attached to the first casing 12 in a flat plate shape so as to close the opening 12b on the rear surface side of the first casing 12. The adapter AD is attached to the center of the second housing 13.

  In the housing 11, a light source 21, a light guide plate 22, a filter 23 provided between the light source 21 and the light guide plate 22, a light transmission unit 24 provided between the filter 23 and the light guide plate 22, And a reflection plate 25.

  As shown in FIG. 2, a light source 21 that emits light is provided on the inner surface 12 f of the wall 12 c of the first housing 12. The light source 21 includes a plurality of semiconductor light emitting elements (LED elements) 21a along the longitudinal direction of the inner surface 12f of the wall 12c. As an example of the light source 21, in the present embodiment, 30 semiconductor light emitting elements 21a are arranged in a substantially straight line to form a unit. This unit has a length of 200 mm and a width of 20 mm, and two units are arranged so that each semiconductor light emitting element 21a is arranged in a straight line with respect to a certain side of the wall portion 12c forming the square cylindrical shape of the first housing 12. In the same manner, two are provided on the opposite wall portion 12c, and a total of four are provided.

  As shown in FIG. 2, each of the semiconductor light emitting elements 21 a constituting the light source 21 is disposed such that the light emitting surface faces the central portion side of the first housing 12. A filter 23 is provided on the light emitting surface side of each semiconductor light emitting element 21a.

  As shown in FIG. 3, the filter 23 includes a pair of filter base materials 23a and 23b, a pair of electrode layers 23c and 23d, a light color layer 23e, and an electrolyte layer 23f. The filter 23 has a laminated structure in which an electrolyte layer 23f and a light color layer 23e are sandwiched between a pair of electrode layers 23c and 23d, and the pair of electrode layers 23c and 23d are sandwiched between the filter base materials 23a and 23b. Yes.

  As shown in FIG. 3, the filter base materials 23a and 23b only need to transmit predetermined light, particularly visible light. If the strength and rigidity necessary for the filter 23 can be secured, glass or polymer film (for example, polyethylene terephthalate). (PET) film) can be used. The filter base materials 23a and 23b have insulation properties to prevent leakage. The filter bases 23a and 23b are not particularly limited in thickness or the like as long as the strength and rigidity are ensured.

  As shown in FIG. 3, the electrode layers 23c and 23d have conductivity, and it is only necessary to transmit predetermined light, particularly visible light, and oxide conductive materials such as indium tin oxide (ITO), zinc oxide, and tin oxide. Body, conductive polymer, etc. can be used. Moreover, a structure in which optical transmittance and conductivity are compatible by wiring a metal material having low optical transmittance and not transmitting light in a lattice shape such as a mesh may be used. Further, a structure including both transparent electrode layers such as oxide conductors may be employed. The thickness of the transparent electrode layer is not particularly limited as long as the optical transmittance is sufficiently high, but is preferably 2 μm or less.

  As shown in FIG. 3, the light color layer 23e is a layer containing an electrochromic material (electrochemical responsive material layer) that generates a reversible color change when voltage or current is applied. There are no particular restrictions on the method, the type of electrochromic material, and the concentration of the material. In general, a dispersion of an electrochromic material dispersed in a solvent is disposed on the electrode layer by coating or printing. As the electrochromic material, for example, a Prussian blue complex disclosed in JP 2012-124140 A can be used.

  As shown in FIG. 3, the electrolyte layer 23f only needs to be able to exchange ions with the electrochromic material when the electrochromic material is oxidized / reduced. An electrolyte solution, a gel electrolyte, a solid electrolyte, an ionic liquid, or the like can be used. Available. Although there is no restriction | limiting in particular about the film thickness of an electrolyte layer, 5 micrometers-2000 micrometers are preferable.

  As shown in FIG. 2, a light transmitting portion 24 is provided on the opposite side of the filter 23 from the semiconductor light emitting element 21 a so as to come into contact with the filter 23. The material is not particularly limited as long as the material has light permeability and flexibility, can be easily processed into an arbitrary shape, and can secure heat resistance when used as the lighting device 10. For example, silicone is preferably used. The light transmission portion 24 of the present embodiment is configured to have a Shore A hardness of 60 or less, for example. Further, the light transmission part 24 has a visible light transmittance of 80% or more.

  As shown in FIG. 2, the light guide plate 22 is made of a transmissive member having, for example, a substantially square plate shape with a side of about 480 mm. Examples of the transmissive member include thermoplastic resins such as methacrylic resin (acrylic material), polycarbonate resin, cycloolefin polymer (COP), and cycloolefin copolymer (COC), and glass. The light guide plate 22 has an outer peripheral end surface 22 a in contact with the light transmitting portion 24, and light from the light source 21 is incident on the end surface 22 a via the filter 23 and the light transmitting portion 24. The material of the light guide plate 22 is not particularly limited as long as the light guide plate 22 is light transmissive, can be easily processed into an arbitrary shape, and can efficiently guide incident light with little loss. Absent. The light guide plate 22 has a thickness of about 1 to 20 mm, and is not particularly limited. However, since the light emitted from the semiconductor light emitting element 21a serving as the light source 21 is incident without loss, the semiconductor constituting the light source 21 is used. It is preferable to make it larger than the light emitting element 21a. Moreover, the light guide plate 22 may form an arbitrary prism shape on the surface of the light guide plate 22 to enhance the diffusion effect.

As shown in FIG. 2, the reflecting plate 25 contacts the lower surface 13 a of the second housing 13 on the opposite side of the light guide plate 22 (the ceiling R side in FIG. 2) in order to increase the light output efficiency of the lighting device 10. Be placed.
Next, the operation of the illumination device of this embodiment will be described.

  In the illuminating device 10 of the present embodiment, light emitted from the light source 21 is emitted into a room to be irradiated through the filter 23, the light transmission unit 24, and the light guide plate 22. Here, for example, when the light color temperature of the light source 21 (semiconductor light emitting element 21a) is about 5000K, the energization (voltage application) state of the filter 23 containing the Prussian blue-type metal complex is changed to change the energization (voltage application) state from 5000K to The color temperature can be controlled up to about 14000K. Further, for example, when the light source 21 (semiconductor light emitting element 21a) has a light bulb with a color temperature of about 3000K, by changing the energization state of the filter 23 containing the Prussian blue type metal complex, about 3000K to 10000K. Color temperature can be controlled up to.

  Thus, the color temperature of the emitted light from the light source 21 can be changed by using the filter 23 having the light color layer as the electrochemically responsive material layer. Since this filter 23 is surrounded by the light guide plate 22 and the housing 11 and is built in the lighting device 10, the presence of the filter 23 and the change in the color of the filter 23 are prevented from being conscious by the user. Therefore, the filter 23 can suppress a decrease in design of the lighting device 10.

Next, the effect of this embodiment will be described.
(1) Since the filter 23 having an electrochemically responsive material layer is provided between the semiconductor light emitting element 21a (light source 21) and the light guide plate 22, the filter 23 is not exposed to the outside but directly visible to the user. It is prevented. Thereby, it becomes possible to reduce that the design property of the illuminating device 10 is impaired by the filter 23.

  (2) Further, since the filter 23 is disposed closer to the light source 21 than the light guide plate 22, the effect of the filter 23 can act before the light from the light source 21 is diffused by the light guide plate 22. The size of the filter 23 itself can be reduced. Further, when energizing the filter 23, if the filter is enlarged, the applied voltage or the like may be uneven depending on the location of the filter, resulting in variations in light color. However, as described above, the filter 23 is reduced in size. Therefore, variation in light color due to the filter 23 can be suppressed.

  (3) Since the light transmission part 24 provided between the filter 23 and the light guide plate 22 has flexibility, for example, the light guide plate 22 expands / contracts due to heat generated in the lighting device 10 and warps or bends. Even if the size of the light transmitting portion 24 is changed, the light transmitting portion 24 having flexibility can allow it. Thereby, generation | occurrence | production of the failure | damage etc. of the filter 23 can be suppressed. In particular, the Shore A hardness of the light transmission part 24 is preferably 60 or less.

(4) Since the light transmission part 24 provided between the filter 23 and the light guide plate 22 has a visible light transmittance of 80% or more, a decrease in visible light by the light transmission part 24 can be suppressed.
(5) Since the Prussian blue-type metal complex is contained in the light color layer 23e as the electrochemically responsive material layer, the filter 23 can change the color temperature of the lighting device 10 from a light bulb color to a daylight color. .

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the light transmission part 24 is provided between the filter 23 and the light guide plate 22, but a structure in which the light transmission part 24 is omitted as shown in FIG.

  Further, as shown in FIG. 5, a configuration in which a light transmission part 24 is provided between the semiconductor light emitting element 21 a (light source 21) and the filter 23 may be adopted. Here, it is preferable that the light transmission part 24 is comprised with the light transmissive member which has a condensing function. With such a configuration, it is possible to minimize the loss of light incident on the end surface 22a of the light guide plate 22 and increase the light emission efficiency of the lighting apparatus 10. In this case, the light transmission part 24 is preferably configured as shown in FIGS. As shown in FIGS. 6 and 7, the light transmitting portion 24 includes a light collecting portion 31 having a substantially flat dome shape in cross section, and a mounting flange portion 32 for fixing the housing 11 (see FIG. 5). Have

  The condensing part 31 has the accommodation recessed part 31a which accommodates the semiconductor light-emitting device 21a (light source 21) in the inside. For this reason, it becomes possible to cover all the light emission surfaces of the semiconductor light emitting element 21a, and to suppress light leakage. Moreover, since the condensing part 31 has condensing property, it becomes possible to suppress the spreading | diffusion of the light radiate | emitted from the semiconductor light emitting element 21a, and to permeate | transmit light to the filter 23 side. The mounting flange 32 is formed with a through hole 32a through which a mounting screw (not shown) can be inserted. The light transmitting portion 24 is inserted into the through hole 32a, and is screwed into, for example, a screw hole (not shown) formed in the wall portion 12c of the first housing 12, for example. 11 can be attached.

  -In above-mentioned embodiment, although the light-guide plate 22 was made into square plate shape, it is not restricted to this, According to the design (shape of the housing | casing 11), a specification, etc., it changes suitably to disk shape or other shapes. May be.

  In the above embodiment, the reflection plate 25 is provided, but a reflection film may be used instead of the reflection plate 25. As the reflective film, for example, a glass or plastic film on which a highly reflective metal such as aluminum or silver is deposited, a white polyester film, or the like can be used.

  Further, the reflection plate 25 may be omitted. In this case, the reflector 11 is added to the casing 11 by applying a white coating having a high light reflectance on the lower surface 13a of the second casing 13 (the casing 11) or by depositing a metal material having a high reflectance. It is also possible to do.

  In the above embodiment, the light-colored layer 23e as the electrochemically responsive material layer is configured to contain the Prussian blue type metal complex. However, the present invention is not limited thereto, and other electrochemically responsive material layers may be employed. Good.

  -Although not mentioned in particular in the said embodiment, you may install a diffusion plate in the front surface (lower surface) of the light-guide plate 22 which is the output side of the illuminating device 10. FIG. This diffusion plate is a transparent base material provided with a light diffusion function, and a known light diffusion plate can be used. Examples of the material for the transparent substrate include thermoplastic resins such as methacrylic resin, polystyrene resin, polycarbonate resin, and polyolefin resin, similar to the light guide plate 22. As a method for imparting a light diffusion function, a known method can be used. For example, a method for forming a concavo-convex shape on the surface of a transparent base material, The method of containing is mentioned. Examples of the light diffusing agent include organic particles such as acrylic crosslinked beads and MS crosslinked beads, and inorganic particles such as silica, barium sulfate, and titanium oxide, which may be used alone or in combination of two or more. May be used.

  -In above-mentioned embodiment, although the illuminating device 10 was actualized to the ceiling light, you may apply not only to this but a base light, a spotlight, etc., for example. Further, the present invention can also be applied to the desk stand 40 shown in FIG. 8 and the downlight 41 shown in FIG.

  DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 21a ... Semiconductor light emitting element, 22 ... Light guide plate, 22a ... End face as light incident end face, 23 ... Filter, 23e ... Light color layer as an electrochemical responsive material etc.

Claims (6)

A semiconductor light emitting device;
A light guide plate on which light emitted from the semiconductor light emitting element is incident on the light incident end face of the outer peripheral portion;
An illumination device comprising: a filter having an electrochemically responsive material layer provided between the semiconductor light emitting element and the light guide plate. The lighting device according to claim 1.
An illuminating device comprising a light transmitting member having flexibility between at least one of the filter and the light guide plate and between the semiconductor light emitting element and the filter. The lighting device according to claim 2,
At least the light transmission member provided between the filter and the light guide plate has a visible light transmittance of 80% or more. The lighting device according to claim 2,
At least the light transmitting member provided between the semiconductor light emitting element and the filter has a light collecting property. In the illuminating device as described in any one of Claims 2-4,
The light transmitting member is made of a material having a Shore A hardness of 60 or less. In the illuminating device as described in any one of Claims 1-5,
In the filter, the electrochemically responsive material layer contains a Prussian blue metal complex.