JP2016171201A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire that can achieve high color rendering performance and also suppress degradation in designability of the space.SOLUTION: A light emission device 1 includes an LED light source 2, and a light transmission member 3 provided on the front surface of the LED light source 2. The light transmission member 3 has a base 5, and a wavelength control unit 6 which is provided to the base 5 and controls the wavelength of light emitted from the LED light source 2. The wavelength control unit 6 includes a dye 62 having a maximum absorption wavelength in the wavelength range of 450-650 nm. In a front view of the wavelength control unit 6 and the LED light source 2, central axes of the wavelength control unit 6 and the light emission unit 4 are coaxial with each other, and the size of the wavelength control unit 6 is larger than the emission unit 4 and smaller than the base 5. According to this configuration, high color rendering can be achieved by the wavelength control unit 6 containing the dye 62. Further, the wavelength control unit 6 is provided at a pinpoint position facing the light emission unit 4, so that the appearance color is hardly visible, and degradation in designability of a space where the light emission device is installed can be suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device using a light emitting diode (LED) as a light source.

  A light emitting diode (hereinafter referred to as an LED) is capable of emitting light with high power and high luminance and has a long lifetime, and is therefore used as a light source for a lighting device that replaces an incandescent lamp or a fluorescent lamp. In addition, there is a so-called white LED in which blue light emitted from a blue LED is applied to a phosphor to output yellow light, and white light is generated by mixing blue light and yellow light. White LEDs are excellent in luminous intensity and luminous efficiency, and lighting devices using them are used for lighting fixtures that diffuse light such as ceiling lights and base lights, and lighting fixtures that collect light such as downlights and spotlights. Has been.

  However, the general white LED as described above is not suitable for a lighting device that illuminates food, clothing, etc., because the peak intensity in the red wavelength region is not outstanding in the spectral characteristics of the emitted light and the color rendering is low. There wasn't. Then, the illuminating device which provided the filter layer containing the visible light selective absorption material (henceforth pigment | dye) which has an absorption peak in a wavelength range of 575-600 nm in the front surface of a LED light source is known (for example, patent document 1). reference). According to the invention described in Patent Document 1, the filter layer reduces the intensity of the illumination light in the wavelength region of 575 to 600 nm, and highlights the peak wavelength in the wavelength region of 600 to 620 nm adjacent to the wavelength region. Make it. As a result, the appearance of red is good and the color rendering properties of illumination light can be enhanced.

JP 2010-267571 A

  However, in the lighting device, the entire surface of the filter layer is colored with the color of the pigment, so that, for example, when the lighting device is not turned on, the appearance color of the filter layer can be visually recognized. For example, when such a lighting device is installed on a ceiling or the like on which white wallpaper is pasted, a colored filter layer may be conspicuous and the design of the space in which the lighting device is installed may be deteriorated.

  An object of the present invention is to solve the above-described problems, and to provide a light-emitting device that can obtain high color rendering properties and that can suppress a decrease in design of a space, and a lighting device using the same. And

  In order to solve the above-mentioned problem, the present invention is an illumination device including an LED light source and a light transmission member provided on a front surface of the LED light source, and the LED light source has a predetermined light emission area in a front view. The light transmissive member includes a base material having translucency, and a wavelength control unit that is provided on the base material and controls the wavelength of light emitted from the LED light source. The wavelength control unit includes a dye having a maximum absorption wavelength in a wavelength range of 450 to 650 nm, and the central axes of the wavelength control unit and the light emitting unit are coaxial in a front view of the wavelength control unit and the LED light source. The size of the wavelength control unit is larger than that of the light emitting unit and smaller than that of the base material.

  ADVANTAGE OF THE INVENTION According to this invention, the illumination light which has high color rendering property can be obtained because the light radiate | emitted from the LED light source permeate | transmits the wavelength control part containing a pigment | dye. In addition, the wavelength control unit is pinpointed not at the entire surface of the substrate but at a position facing the light emitting unit, so that the appearance color is difficult to see and the design of the space where the light emitting device is installed is reduced. Can be suppressed.

(A) is a front view of the light-emitting device concerning the 1st Embodiment of this invention, (b) is a side view. The sectional side view of the LED light source used for the light-emitting device. The figure which shows the emission spectrum of the LED light source. The figure which shows structural formula of the tetraaza porphyrin compound used for the wavelength control part of the said light-emitting device. The figure which shows the light absorption spectrum of the tetraaza porphyrin compound used for a wavelength control part. The figure which shows the spectrum of the emitted light of the said light-emitting device. (A) is a front view of the light-emitting device concerning the 2nd Embodiment of this invention, (b) is a side view. The sectional side view of the LED light source used for the light-emitting device. (A) is a front view of the light-emitting device which concerns on the modification of the said embodiment, (b) is a side view. (A) is a sectional side view of the illuminating device using the light-emitting device which further modified the light-emitting device concerning the said embodiment and modification, (b) is the partially expanded view of (a). The sectional side view of the light-emitting device which concerns on the 3rd Embodiment of this invention.

  A light emitting device according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1A and 1B, the light emitting device 1 of this embodiment includes an LED light source 2 and a light transmission member 3 provided on the front surface of the LED light source 2. The front surface of the LED light source 2 refers to a surface facing the direction in which light is emitted from the LED light source 2. The LED light source 2 is, for example, a general-purpose LED module such as a chip-on-board (COB) type LED, a surface mount device (SMD) type LED, or a bullet-type LED, and a light emitting unit 4 having a predetermined light emitting area in a front view. Have

  The light transmissive member 3 includes a base material 5 having translucency, and a wavelength control unit 6 that is provided on the base material 5 and controls the wavelength of light emitted from the LED light source 2. The base material 5 is a structural material corresponding to a cover or a lens of the LED light source 2 and has a sufficient thickness as compared with the wavelength control unit 6. In the present embodiment, the wavelength control unit 6 is provided on the surface of the substrate 5 on which light from the LED light source 2 is incident. In the present embodiment, one wavelength control unit 6 is provided for one LED light source 2.

  As the LED light source 2, an LED module having a light emitting unit 4 on one surface is used, and this LED module is mounted on a substrate 7. The LED light source 2 is, for example, an LED in which a GaN-based blue LED chip that emits blue light with an emission peak wavelength of 460 nm is coated with a YAG-based yellow phosphor, and white light is emitted by mixed light of blue light and yellow light. Modules are used. When the LED light source 2 is a single unit as in this embodiment, a general-purpose COB type LED module is preferably used.

  Specifically, as shown in FIG. 2, the LED light source 2 includes a substrate 20 having a rectangular cross section made of aluminum or ceramic, an LED chip 21 mounted on the substrate 20, and a bank 22 surrounding the LED chip 21. And a sealing member 23 filled in the bank 22. In the example shown in the figure, a configuration using two LED chips 21 is shown, but the present invention is not limited to this. For example, a silicone resin or the like is used for the sealing member 23 and contains a phosphor 24 that converts the wavelength of light emitted from the LED chip 21. A cathode electrode 25 and an anode electrode 26 are respectively provided on the upper surface of the substrate 20, and the cathode electrode 25 and the anode electrode 26 are connected to each electrode terminal of the LED chip 21 by wires 27.

  The inner periphery of the bank 22 has a circular shape when viewed from above, and the surface of the sealing member 23 exposed from the opening of the bank 22 is filled with the sealing member 23 containing the phosphor 24 in the periphery. Becomes the light emitting section 4 that emits light. In FIGS. 1A and 1B, the LED light source 2 and the light emitting unit 4 are illustrated as the same configuration.

  In the LED light source 2 of the present embodiment, for example, the LED chip 21 emits light having an emission peak wavelength in the vicinity of a wavelength of 260 nm, and the phosphor 24 has an emission peak wavelength in the vicinity of a wavelength of 610 nm as shown in FIG. The light it has is emitted. The LED light source 2 can emit white light obtained by mixing these lights.

  The base material 5 (see FIG. 1B again) is made of any resin material or glass having translucency. For example, examples of the optically transparent material include thermoplastic resins such as polymethyl methacrylate, polycarbonate, cyclic polyolefin, cyclic polyolefin copolymer, and polymethylpentene. Examples of the milky white translucent material include thermoplastic resins such as polyethylene and polypropylene. Furthermore, after adding a crosslinking component to a methacrylic acid resin or a silicone resin, a thermosetting resin that is cured by applying heat or energy such as an electron beam or ultraviolet rays may be used. In addition, an ultraviolet absorber, a light stabilizer, an antioxidant, a hydrolysis inhibitor, and the like may be appropriately added to the base material 5 with respect to the resin material serving as a base material, depending on the application. In the present embodiment, a flat plate-like member is illustrated as the substrate 5, but as shown in FIGS. 9 and 10 described later, the substrate 5 is formed and processed into a shape that diffuses or condenses the emitted light. It may be a light distribution control member.

  The wavelength controller 6 includes a base material 61 made of a resin material having translucency, and a pigment 62 added to the base material 61. For the base material 61, a thermoplastic resin similar to the optically transparent material used for the base material 5 is preferably used.

  The dye 62 is a compound having a property of selectively absorbing light having a specific wavelength. Examples thereof include dyes mainly composed of organic compounds such as tetraazaporphyrin, tetraphenylporphyrin, octaethylporphyrin, phthalocyanine, cyanine, pyromethene, squarylium, xanthene, dioxane and oxonol. In particular, a tetraazaporphyrin compound as shown in FIG. 4 is preferably used because it has high fastness to light irradiation from a light source. In the figure, M represents an element serving as a central metal, and R1 to R8 represent substituents.

  In the present embodiment, a dye having a maximum absorption wavelength in the wavelength range of 450 to 650 nm is used as the dye 62. In particular, tetraazaporphyrin, which is a dye having a maximum absorption wavelength in the wavelength range of 570 to 590 nm, is preferably used. FIG. 5 is prepared by using an acrylic resin (VH001 (manufactured by Mitsubishi Rayon Co., Ltd.)) for the base material 5 and the base material 61, and adding a tetraazaporphyrin compound having copper as a central metal at a concentration of 3.0 ppm. The result of having measured the light absorption characteristic of the wavelength control unit 6 with a self-recording spectrophotometer (U4100, manufactured by Hitachi High-Technology Co., Ltd.) is shown. In the light transmissive member 3 produced as described above, the base material 5 and the base material 61 itself have a light absorptivity of about 8%, and the transmittance at the peak wavelength in the range of 450 to 650 nm is about 60%. Absorbs to some extent and transmits about 32% of light.

  In the LED light source 2, the emitted light from the LED light source 2 having the light emission characteristics shown in FIG. 3 is transmitted through the wavelength control unit 6 containing the dye having the absorption characteristics shown in FIG. Is emitted. FIG. 6 shows spectral characteristics of white light emitted from the light emitting device 1. In addition, the spectrum of the figure was measured by the instantaneous multiphotometry system (MCPD-7700 (made by Otsuka Electronics Co., Ltd.)). Since the white light emitted from the LED light source 2 is absorbed in the wavelength range of 570 to 590 nm, the peak wavelength near 610 nm can be made to stand out. As a result, a high color rendering property can be obtained, and in particular, a red object can be displayed vividly.

  In the present embodiment, as shown in FIGS. 1A and 1B, the center of the wavelength control unit 6 and the light emitting unit 4 (LED light source 2) in the front view of the wavelength control unit 6 and the LED light source 2. The axis L is coaxial, and the size of the wavelength control unit 6 is larger than the light emitting unit of the LED light source 2 and smaller than the substrate 5. That is, the wavelength control unit 6 is provided not at the entire surface of the substrate 5 but at a position facing the light emitting unit 4 of the LED light source 2 at a pinpoint. Therefore, as compared with the case where the entire surface of the filter layer is colored with the color of the pigment as in the conventional lighting device, the appearance color of the wavelength control unit 6 is less visible when the light emitting device 1 is not lit. It is possible to suppress a decrease in designability of the space where the light emitting device is installed.

  Although the size of the wavelength control unit 6 with respect to the light emitting unit 4 of the LED light source 2 varies depending on the distance between the LED light source 2 and the light transmission member 3, the wavelength control unit 6 satisfies at least a half beam angle of the LED light source 2. It is preferable that it is provided in the range. That is, as shown in FIG. 1A, an angle α1 formed by a line segment s connecting the outer edge of the light emitting unit 4 and the outer edge of the wavelength control unit 6 and a line L1 parallel to the central axis L of the light emitting unit 4 is What is necessary is just to be larger than the 1/2 beam angle designed by the LED light source 2. In this way, most of the light emitted from the LED light source 2 is transmitted through the wavelength control unit 6 and is wavelength-controlled by the pigment 62, so that the color rendering property of the illumination light can be enhanced. On the other hand, when the wavelength control unit 6 is too large, the appearance color of the wavelength control unit 6 is easily visible. Therefore, the wavelength control unit 6 is provided in a range where the angle α1 is smaller than the maximum light distribution angle α2 of the LED light source 2.

  Further, as the distance between the LED light source 2 and the light transmitting member 3 is shorter, the size of the wavelength control unit 6 can be reduced, the appearance color of the wavelength control unit 6 is more difficult to be visually recognized, and the light emitting device 1 is installed. It is possible to suppress a decrease in design of the space. On the other hand, if the LED light source 2 and the light transmission member 3 are too close to each other, the dye 62 contained in the wavelength control unit 6 of the light transmission member 3 is damaged by the heat from the LED light source 2, and wavelength selective absorption performance. May decrease. Therefore, the distance between the LED light source 2 and the light transmitting member 3 depends on the output and heat dissipation performance of the LED light source 2 (LED light source 2). ˜15 mm. In this way, the wavelength control unit 6 can be made smaller and the appearance color can be made more difficult to be visually recognized, and damage to the pigment 62 can be suppressed, and illumination light with high color rendering properties can be obtained over a long period of time.

  Moreover, in the light transmissive member 3 of this embodiment, the base material 5 is thicker than the wavelength control unit 6, and the wavelength control unit 6 is on the surface on which the light from the LED light source 2 of the base material 5 is incident. Is provided. For this reason, when the light emitting device 1 is viewed from the outside, the wavelength control unit 6 is difficult to be visually recognized because the wavelength control unit 6 is provided on the surface of the substrate 5 opposite to the surface from which light is emitted. It is possible to further suppress the deterioration of the design property of the space in which is installed. Moreover, the wavelength control part 6 can be made harder to visually recognize by comprising the light transmissive member 3 with milky white resin material, or performing a diffusion process to the surface which the light emits among the base materials 5. FIG.

  A light emitting device according to a second embodiment of the present invention will be described with reference to FIG. As shown in FIGS. 7A and 7B, the light-emitting device 1 according to this embodiment includes a plurality of LED light sources 2 on a substrate 7, and the base material 5 of the light transmitting member 3 includes a plurality of LED light sources 2a. It is provided to cover the front. Moreover, the some wavelength control part 6 is provided in the base material 5 for every LED light source 2a. In the example shown in the figure, a configuration in which five LED light sources 2a are provided is shown, but the number of LED light sources 2a is not limited thereto.

  In the present embodiment, a general-purpose SMD type LED module is preferably used as the LED light source 2a. Specifically, as shown in FIG. 8, the LED light source 2 includes a base material 20 a having a rectangular cross section, a light emitting unit (LED chip) 21 mounted on the base material 20 a, and a recess surrounding the LED chip 21. And a sealing member 23 filled in the frame body 22a. The sealing member 23 and the phosphor 24 are the same as in the above embodiment. A cathode electrode 25 is provided on one side surface of the base material 20a, and an anode electrode 26 is provided on the other side surface in the form of a lead frame, which are connected to external connection electrodes 27 and 28 formed at both ends of the lower surface of the base material 20a. The Further, the cathode electrode 25 and the anode electrode 26 are connected to respective electrode terminals (not shown) of the LED chip 21 by wires 29.

  The concave portion of the frame body 22a has a circular shape when viewed from above, and includes a bottom surface on which the LED chip 21 is mounted, an opening for deriving light, and a side surface formed so as to spread conically from the bottom surface toward the opening. And having. The side surface is subjected to light reflection processing so as to reflect light emitted from the LED chip 21 with high efficiency. By filling the recess with the sealing member 23 containing the phosphor 24, the opening of the recess becomes the light emitting unit 4 of the LED light source 2. 7A and 7B, the light emitting unit 4 of the LED light source 2 is illustrated as a configuration.

  As shown in FIGS. 7A and 7B, also in this embodiment, the central axis L of the wavelength control unit 6 and the light emitting unit 4 of the LED light source 2 is coaxial in the front view of each LED light source 2, The size of the wavelength control unit 6 is larger than the light emitting unit 4 of the LED light source 2 and smaller than the base material 5. That is, the wavelength control unit 6 is provided not at the entire surface of the substrate 5 but at a position facing the light emitting unit of the LED light source 2 at a pinpoint. Therefore, as compared with the case where the entire surface of the filter layer is colored with the color of the pigment as in the conventional lighting device, the appearance color of the wavelength control unit 6 is less visible when the light emitting device 1 is not lit. Deterioration in the design of the space in which the light emitting device 1 is installed can be suppressed.

  Further, according to the present embodiment, by setting the number of the LED light sources 2, it is possible to easily cope with an increase in output according to the use of the light emitting device 1. In addition, since the SMD type LED module used in the LED light source 2 of the present embodiment is smaller in size of the light emitting unit 4 than the COB type LED module used in the above embodiment, the wavelength control unit 6 is also smaller. can do. Therefore, the appearance color of the wavelength control unit 6 is less visible than in the above embodiment, and the deterioration of the design of the space where the light emitting device 1 is installed can be more effectively suppressed.

  Next, a light emitting device according to a modification of the above embodiment will be described with reference to FIG. In the light emitting device 1 according to this modification, the light transmission member 3 includes an auxiliary wavelength control unit 6 a that includes a dye 62 that is substantially the same as the dye 62 contained in the wavelength control unit 6. The auxiliary wavelength control unit 6a is configured to be thinner than the wavelength control unit 6 described above or to have a lower concentration of the pigment 62, and in the region of the substrate 5 where the wavelength control unit 6 is provided. It is provided in the surrounding area. In this modification, a plurality of wavelength control units 6 are provided on the base material 5 so as to correspond to the plurality of LED light sources 2, and the auxiliary wavelength control unit 6 a is embedded so as to fill the space between the wavelength control units 6. Is provided.

  By providing this auxiliary wavelength control unit 6a, the wavelength of light emitted from the LED light source 2 with a wide light distribution and directed to the region outside the periphery of the wavelength control unit 6 can also be controlled. Unevenness can be suppressed. Further, since the auxiliary wavelength control unit 6 a is configured to be thinner than the wavelength control unit 6 or to have a lower concentration of the pigment 62, the color due to the pigment 62 is weaker than that of the wavelength control unit 6. Therefore, the appearance color of the auxiliary wavelength control unit 6a is difficult to be visually recognized, and the design of the space where the light emitting device 1 is installed can be prevented from being deteriorated.

  Further, the wavelength control unit 6 having a high content of the pigment 62 and a strong color is provided in a narrow area around the central axis L of the LED light source 2 where the luminous flux is increased, and is separated from the central axis L and is luminous flux. It is desirable to provide the auxiliary wavelength control unit 6a in the peripheral region of the wavelength control unit 6 where the amount is reduced. According to this configuration, since the size of the wavelength control unit 6 can be reduced, it is difficult for the wavelength control unit 6 to be visually recognized, and it is possible to suppress a decrease in design of the space where the light emitting device 1 is installed.

  Next, a light emitting device according to a modified example in which the above embodiment and the modified example are further modified, and a lighting device using the light emitting device will be described with reference to FIG. As shown in FIG. 10A, the light emitting device 1 according to this modification includes a plurality of LED light sources 2 arranged in an annular shape around the central portion of the fixture body 11 of the lighting device 10, and the LED light sources 2. A light transmission member 3a that is provided in the light emitting direction and controls the light distribution of the light emitted from the LED light source 2; Moreover, the illuminating device 10 is provided with the diffusion member (cover) 12 which is provided in the light emission direction from the light transmission member 3a, and diffuses and radiates | emits the light radiate | emitted from this light transmission member 3a. In the present embodiment, LED groups formed by annularly arranging a plurality of LED light sources 2 are arranged in two rows concentrically.

  The instrument main body 11 is a disk-shaped structural member, and the LED light source 2 and the like are arranged on the surface opposite to the construction surface such as a ceiling. In the central part of the instrument main body 11, a power feeding unit 13 fixed to a power feeding connector or the like provided on the construction surface is provided. In addition, a lighting circuit (not shown) for lighting and driving the LED light source 2 and a substrate 14 on which the LED light source 2 is mounted are provided on the outer peripheral side of the power supply unit 13. The instrument main body 11 is formed by pressing and cutting a plate material such as an aluminum plate or a steel plate having a predetermined rigidity into the above shape, and has a high visible light reflectivity on the surface on which the LED light source 2 and the like are arranged. A white paint may be applied or a reflective metal material may be deposited.

  The power supply unit 13 is a general-purpose adapter guide, and is connected to a commercial AC power supply via a power supply connector or the like. The lighting circuit includes a transformer, a capacitor, a control IC, and the like for converting and rectifying the alternating current supplied from the power supply unit 13 into a direct current having a predetermined voltage suitable for the LED light source 2. The board | substrate 14 consists of insulating materials, such as glass epoxy resin, for example, and the predetermined wiring pattern is formed in the surface in which the LED light source 2 is mounted. The lighting circuit is configured so that the center LED group and the outer LED group can be independently lit based on a user operation. Note that the LED light sources 2 in each LED group may be individually or grouped so that further partial lighting or thinning lighting can be performed.

  As the LED light source 2, an SMD type LED module is preferably used as in the above modification. The light transmissive member 8 is a bowl-shaped lens member that collectively covers the plurality of LED light sources 2 arranged in an annular shape, and is formed of a light transmissive resin such as an acrylic resin. In the present modification, the light transmissive member 8 includes a central lens portion 8a that covers the LED group on the center side of the device, and an outer lens portion 8b that covers the LED group on the outer periphery side of the device. Further, the central lens portion 8a and the outer lens portion 8b are connected to each other by a base portion 80 for fixing the light transmitting member 8 to the instrument body 11, and they are integrally formed. The cover 12 has a dome shape that covers the front surface of the instrument main body 11 and is formed of, for example, a resin material obtained by adding light diffusing particles or a pigment to a translucent material such as an acrylic resin. The cover 12 is obtained by subjecting the front or back surface of a transparent glass plate or resin plate to a rough surface by applying a sandblasting treatment or a textured surface instead of the addition of the above light diffusing particles or pigments. Etc.

  As shown in FIG. 10B, in addition to the above-described base portion 80, the light transmission member 8 covers the light emitting portion 4 of the LED light source 2, and has a concave incident surface 81 on which light emitted from the LED light source 2 is incident. It has a medium part 82 through which light incident from the surface 81 propagates and an emission surface 83 through which light propagated through the medium part 82 exits. In this modification, the wavelength control unit 6 is provided on the incident surface 81.

  Moreover, the wavelength control part 6 is formed by apply | coating the base material 61 of the translucent resin containing the pigment | dye 62 to the concave incident surface 81 (refer also FIG.1 (b)). Here, if a thermoplastic resin is used for the base material 61, the wavelength control unit 6 can be easily formed by applying a material to the concave incident surface 81 and cooling and curing the material.

  A light emitting device according to a third embodiment of the present invention will be described with reference to FIG. The light emitting device 1 according to the present embodiment includes an LED light source 2, a substrate 7 on which the LED light source 2 is mounted, and a light transmissive member 9 that refracts light emitted from the LED light source 2 and emits the light in a predetermined direction. Prepare. In the present embodiment, a bullet-type LED is used as the LED light source 2.

  The light transmissive member 9 is a lens that generates substantially parallel light, and is formed on the small bottom surface 92 by forming an outer shell 93 of a rotating body having a large bottom surface 91 and a small bottom surface 92 about the optical axis La. The concave portion 94 serves as an incident surface for light emitted from the LED light source 2, and refracts the light to emit it in a predetermined direction. The concave portion 94 has a convex surface 95 that is curved so that the surface facing the LED light source 2 is convex toward the LED light source 2 side, and a side surface 96 that connects the convex surface 95 and the small bottom surface 92. As the material of the light transmitting member 9, the same transparent material as that in the above embodiment is used. In the light transmissive member 9 configured as described above, the light incident on the convex surface 95 from the LED light source 2 is directly emitted to the outside from the large bottom surface 91. Further, the light incident on the side surface 96 is totally reflected by the outer shell 93 and emitted from the large bottom surface 91 to the outside.

  In the present embodiment, the wavelength control unit 6 is provided on the large bottom surface 91 serving as the light exit surface of the light transmission member 9. The size of the wavelength control unit 6 is set to be larger than the module area in the front view of the LED light source 2. Also in this configuration, the wavelength control unit 6 is provided pinpointed at a position corresponding to the LED light source 2 in the large bottom surface 91, so that the wavelength control unit 6 is difficult to be visually recognized, and the light emitting device 1 is installed. It is possible to suppress a decrease in design of the space.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the third embodiment, the wavelength control unit 6 is provided on the large bottom surface 91 serving as the emission surface of the light transmission member 9, but the wavelength control unit 6 may be provided on the convex surface 95 serving as the incident surface. . In this case, the base material 61 of the wavelength control unit 6 is made of a material having the same refractive index as that of the light transmission member 9 so that refraction and total reflection at the interface between the wavelength control unit 6 and the light transmission member 9 are less likely to occur. It is desirable. Moreover, you may provide the auxiliary | assistant wavelength control part 6a shown in the modification of 2nd Embodiment in the outer side of the wavelength control part 6 of the said 3rd Embodiment. In addition, the front view shape of the light emitting unit 4 of the LED light source 2 is not limited to the illustrated circle, and may be a square, a rectangle, or an arbitrary polygon. In this case, the wavelength control unit 6 is the size of the light emitting unit 4. Any shape that satisfies the requirements and does not become excessively large can be employed.

DESCRIPTION OF SYMBOLS 1 Light-emitting device 10 Illuminating device 2 LED light source 3 Light transmissive member 4 Light emission part 5 Base material 6 Wavelength control part 6a Auxiliary wavelength control part 62 Dye

Claims (6)

An illumination device comprising an LED light source and a light transmissive member provided in front of the LED light source,
The LED light source has a light emitting part having a predetermined light emitting area in front view,
The light transmissive member includes a base material having translucency, and a wavelength control unit that is provided on the base material and controls the wavelength of light emitted from the LED light source,
The wavelength control unit includes a dye having a maximum absorption wavelength in a wavelength range of 450 to 650 nm,
In the front view of the wavelength control unit and the LED light source, the central axes of the wavelength control unit and the light emitting unit are coaxial, and the size of the wavelength control unit is larger than the light emitting unit and smaller than the base material. A light emitting device characterized by that. A plurality of the LED light sources;
The base material is provided so as to cover the front surfaces of the plurality of LED light sources,
The light emitting device according to claim 1, wherein a plurality of the wavelength control units are provided on the base for each LED light source.   The light emitting device according to claim 1, wherein the wavelength control member is provided on a surface of the base material on which light from the LED light source is incident. The light transmitting member has an auxiliary wavelength control unit including a dye substantially the same as the dye contained in the wavelength control unit,
The auxiliary wavelength control unit is configured to be thinner than the wavelength control unit or to have a lower concentration of the dye, and outside the region where the wavelength conversion unit is provided in the substrate. The light emitting device according to claim 1, wherein the light emitting device is provided in a region.   The light emitting device according to any one of claims 1 to 4, wherein the dye is a tetraazaporphyrin compound.   An illumination device using the light emitting device according to any one of claims 1 to 5.