JP2012244070A - Light-emitting device and lighting apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ambient illumination intensity in a light-emitting device using a solid light-emitting diode (LED) by allowing light to be irradiated toward a construction surface.SOLUTION: A light-emitting device 1 includes: a solid light-emitting diode (LED 2); a substrate 3 configured to mount the LED 2 thereon; and an optical member 4 disposed in a light lead-out direction of the LED 2. The optical member 4 is disposed to cover the LED 2 and the substrate 3, and extends toward an outer periphery of the substrate 3 beyond a peripheral edge part thereof, and includes: an incidence surface 41 opposed to the LED 2; a first transmission surface 42 opposing the incidence surface 41; a total reflection surface 43 located closer to the outer periphery of the first transmission surface 42; and a second transmission surface 44 located closer to the outer periphery of the peripheral edge part of the substrate 3. According to this configuration, the light entered from the incidence surface 41 is outputted from the first transmission surface 42, or is subjected to total internal reflection by the total reflection surface 43, and is then outputted from the second transmission surface 44. Therefore, the light can be irradiated toward a construction surface of the light-emitting device 1, thereby improving ambient illumination intensity.

Description

  The present invention relates to a light emitting device using a plurality of solid state light emitting elements as a light source, and an illumination device using the same.

  A light-emitting diode (hereinafter referred to as an LED) is attracting attention as a light source for a lighting device that can replace incandescent lamps and fluorescent lamps because it can emit light with high luminance at low power and has a long lifetime. As a LED used in lighting devices, a blue LED chip that emits blue light is coated with a phosphor layer that converts the wavelength of the blue light into yellow light, and white light is generated by mixing the blue light and yellow light. White LED packages are known.

  In this type of LED package, the light emitting surface of the phosphor layer to be mounted is generally formed in a flat or hemispherical shape, so that light distribution with high directivity to the front of the LED is obtained. Therefore, when such an LED package is mounted on a lighting device equipped with a diffuse transmission panel, the luminance directly above the LED tends to increase locally on the exit surface of the diffuse transmission panel, resulting in nonuniform luminance distribution. , Glare may occur.

  In view of this, a light-emitting device including a lens that distributes light from an LED package to a wide-angle light distribution is known (for example, see Patent Document 1). This light emitting device distributes the emitted light by refracting and reflecting the light from the LED using a lens having a cross-sectional shape that is provided in the light emitting direction of the LED and having a cross-sectional shape. In addition to wide-angle light distribution, the luminance distribution is made uniform.

JP 2011-34770 A

  By the way, in the lighting device, not only uniforming the luminance distribution and reducing the glare but also effectively improving the brightness of the space is an important factor. As a lighting technique for improving the brightness of the space, there is an improvement in so-called ambient illuminance that uniformly brightens the surroundings such as the ceiling and the wall surface. However, in the light emitting device shown in Patent Document 1, since the surface of the lens facing the substrate is formed as a diffusely reflecting surface, it is impossible to irradiate the construction surface side of the light emitting device with ambient illuminance. It cannot be improved.

  This invention solves the said subject, and aims at providing the light-emitting device which can irradiate light to the construction surface side, and can improve ambient illumination intensity, and the illuminating device using this light-emitting device. And

  In order to solve the above-described problem, a light-emitting device according to the present invention includes a solid-state light-emitting element, a substrate on which the solid-state light-emitting element is mounted, and an optical member provided in the light leading direction of the solid-state light-emitting element, The optical member is arranged so as to cover the solid light emitting element and the substrate, and is extended to the outer peripheral side from the peripheral portion of the substrate. An incident surface on which incident light is incident, a first transmission surface that faces the incident surface and transmits light incident from the incident surface, and is positioned on an outer peripheral side of the first transmission surface, and the incident surface A total reflection surface that totally reflects light incident from the surface, and a second transmission surface that is located on the outer peripheral side of the peripheral portion of the substrate and transmits light totally reflected by the total reflection surface. It is characterized by.

  In the light emitting device, the incident surface has a concave accommodating portion that accommodates the solid light emitting element, and the first transmission surface has a concave curved surface that is concave in the direction of the solid light emitting element, The total reflection surface preferably has a convex curved surface that is convex in the light leading direction of the solid state light emitting device.

  In the light-emitting device, a plurality of solid-state light-emitting elements are mounted on the substrate, and the optical member is provided in a solid-state light-emitting element that is at least close to a peripheral portion of the substrate among the plurality of solid-state light-emitting elements. preferable.

  In the light emitting device, it is preferable that a plurality of solid light emitting elements are mounted on the substrate, and the optical member is provided so as to cover the plurality of solid light emitting elements.

  In the light-emitting device, it is preferable that the second transmission surface is curved so as to be gradually separated from a plane including the substrate from the inner peripheral side to the outer peripheral side.

  The light emitting device includes a holding member that holds the solid state light emitting element, the substrate, and the optical member, the holding member protruding from a construction surface, and holding the optical member at a predetermined distance from the construction surface. It is preferable that it is comprised.

  The light-emitting device preferably includes a holding member that holds the solid-state light-emitting element, the substrate, and the optical member, and the holding member is configured to be embedded in a construction surface.

  The light emitting device is preferably used for a lighting device.

  According to the light emitting device of the present invention, the light incident from the incident surface of the optical member is totally reflected from the first transmission surface or the total reflection surface and is second transmitted from the peripheral edge of the substrate. Since it radiates | emits from a surface, when a board | substrate is made into the construction surface side, light will be irradiated to this construction surface side, and ambient illuminance can be improved.

1 is a side sectional view of a light emitting device according to a first embodiment of the present invention. The perspective view of the light-emitting device. (A) and (b) are the figures for demonstrating the shape of the 1st transmission surface and total reflection surface of the optical member in the light-emitting device. The sectional side view which shows the detailed structure of the solid light-emitting device used for the light-emitting device. Side sectional drawing of the light-emitting device which concerns on the modification of embodiment same as the above. (A) Side sectional drawing of the light-emitting device which concerns on another modification, (b) is a side sectional view of the light-emitting device which concerns on another modification. The perspective view of the light-emitting device which concerns on another modification. The side sectional view of the light-emitting device concerning another modification. The sectional side view of the light-emitting device which concerns on the 2nd Embodiment of this invention, and an illuminating device using the same. Side sectional drawing of the light-emitting device which concerns on the modification of embodiment same as the above. The perspective view of the light-emitting device which concerns on another modification. The side sectional view of the light-emitting device concerning another modification. The side sectional view of the light-emitting device concerning another modification.

  A light emitting device according to a first embodiment of the present invention and a lighting device using the light emitting device will be described with reference to FIGS. As shown in FIGS. 1 and 2, the light emitting device 1 of the present embodiment includes a light emitting diode (hereinafter referred to as LED) 2 as a solid light emitting element, a wiring board (hereinafter referred to as substrate) 3 on which the LED 2 is mounted, and an LED 2. And an optical member 4 for adjusting the light distribution of the light emitted from the light source. The light emitting device 1 only needs to have the construction surface on the substrate 3 side, and a space for ambient illumination is provided between the lower surface of the substrate 3 and the construction surface.

  The optical member 4 is a lens formed of a translucent material such as acrylic resin, silicone resin, or glass, and is disposed so as to cover the LED 2 and the substrate 3, and extends to the outer peripheral side from the peripheral portion of the substrate 3. Has been. For example, if the substrate 3 is rectangular and the diagonal length is 3 cm, the outer diameter of the optical member 4 is φ9 cm, but the outer periphery of the optical member 4 is sufficiently larger than the peripheral edge of the substrate 3. What is necessary is not restricted to the said size. In addition, a solid light emitting element is not limited to an LED, and may be, for example, an organic EL element.

  The optical member 4 includes an incident surface 41 on which light from the LED 2 is incident, a first transmission surface 42 that transmits light from the incident surface 41, and a total reflection surface 43 that totally reflects light from the incident surface 41. And a second transmission surface 44 that transmits the light totally reflected by the total reflection surface 43.

  The incident surface 41 is a substantially central portion of the bottom surface of the optical member 4 and is formed at a position facing the LED 2. Further, the incident surface 41 has a concave accommodating portion 41 a that accommodates the LED 2. The shape of the inner surface (incident surface 41) of the accommodating portion 41a is formed in, for example, a hemisphere so as to have a certain distance from the LED 2. The shape of the incident surface 41 is a smooth surface so that light emitted radially from the LED 2 can be efficiently introduced into the optical member 4 without being totally reflected. In addition, the accommodating portion 41a may be appropriately filled with, for example, the same material as the resin material constituting the optical member 4. In the present embodiment, a recess 41b that accommodates the substrate 3 is formed around the accommodating portion 41a. The recess 41b is formed to have substantially the same size and depth as the size and thickness of the substrate 3, and the surface of the substrate 3 on which the LED 2 is not mounted and the bottom surface (second transmission surface 44) of the optical member 4. Is considered to be a level surface.

  The first transmission surface 42 is formed at a substantially central portion of the light emission surface of the optical member 4 and at a position facing the incident surface 41. Further, the first transmission surface 42 has a concave curved surface 42a that is concave in the direction of the LED 2. Due to the concave curved surface 42a, the light from the incident surface 41 is refracted to the outer peripheral side at the interface of the first transmission surface 42 and radiated out of the optical member 4, so that the light distribution of the light emitted from the LED 2 is distributed. Can be wide angle.

  In the example shown in the figure, the first transmission surface 42 is formed as a smooth surface. However, the present invention is not limited to this, and the first transmission surface 42 may be formed as a rough surface. That is, by roughening the surface of the first transmission surface 42, the light from the incident surface 41 is diffused when passing through the first transmission surface 42, so that the occurrence of glare can be suppressed. it can. The roughening is performed, for example, by blasting or the like in which a material having higher hardness than the optical member 4 such as small sand is applied to the surface. At this time, the roughness can be arbitrarily set by appropriately adjusting the amount of sand applied to the surface of the first transmission surface 42 or the size of the sand particles. Further, the roughness may be distributed on the first transmission surface 42. For example, since the luminance directly above the LED 2 on the first transmission surface 42 is particularly high, the occurrence of glare can be effectively suppressed by increasing the roughness of this portion.

  The total reflection surface 43 is provided at a position on the outer peripheral side of the first transmission surface 42, and the outer diameter thereof is sufficiently larger than the peripheral portion of the substrate 3 to form the peripheral portion of the optical member 4. Further, the total reflection surface 43 has a convex curved surface 43 a that is convex in the light-derived direction of the LED 2. The light from the incident surface 41 is totally reflected at the interface of the convex curved surface 43 a (total reflection surface 43) and guided to a region on the outer peripheral side of the peripheral portion of the substrate 3 in the optical member 4.

  The second transmission surface 44 is provided on the outer peripheral side of the peripheral edge of the substrate 3. In the present embodiment, the second transmission surface 44 is formed as a flat surface that is flush with the surface of the substrate 3 opposite to the surface on which the LED 2 is mounted, and the outer periphery thereof is the periphery of the total reflection surface 43. Connected with the department. Similarly to the first transmission surface 42, the surface of the second transmission surface 44 may be roughened. By so doing, the light from the total reflection surface 43 is diffused when passing through the second transmission surface 44, so that light can be irradiated over a wide range. Further, a fine concavo-convex structure may be formed on the surface of the second transmission surface 44. In this case, the same effect as the roughening can be obtained.

  Here, detailed shapes of the first transmission surface 42 and the total reflection surface 43 of the optical member 4 will be described with reference to FIGS. The total reflection surface 43 of the optical member 4 is preferably formed in an equiangular spiral shape or a shape conforming thereto. Here, as shown in FIG. 3A, the equiangular spiral is an angle (hereinafter referred to as an angle) formed by a straight line passing through a certain origin and a point on the equiangular spiral and a tangent of the point on the equiangular spiral. A curve in which α) is always constant. The light emitting part of the LED 2 is arranged at the origin, and the angle (90 ° −α), that is, the incident angle of the light from the LED 2 (origin) to the total reflection surface 43 (conformal spiral) is set to an angle greater than the critical angle. Then, all the light emitted from the LED 2 (origin) is theoretically totally reflected at the interface of the total reflection surface 43. That is, as shown in FIG. 3B, the total reflection surface 43 is formed of a curved surface including an equiangular spiral whose angle α is equal to or less than a predetermined angle. On the other hand, the first transmission surface 42 is formed of a curved surface including a curve having an angle α equal to or greater than a predetermined angle. For example, when the optical member 4 is formed of a polycarbonate resin, the refractive index of the polycarbonate resin is 1.585, and the critical angle is about 39 °, so the angle α = 51 ° (= 90 ° -39 °). It becomes. That is, in this example, the total reflection surface 43 is formed of a curved surface including an equiangular spiral with an angle α = 51 ° or less, while the first transmission surface 42 has a curve with an angle α = 51 ° or more. Formed from a curved surface. In addition, since the first transmission surface 42 and the total reflection surface 43 are formed as a smoothly continuous curved surface, it is possible to suppress the occurrence of light unevenness in a region where the curvature changes.

  As shown in FIG. 4, the LED 2 is configured as an LED package by covering with a wavelength conversion member 21 that converts the wavelength of light emitted from the LED 2. The size of the LED package is, for example, 2 mm. Although LED2 will not be specifically limited if it is a light source which can light-emit desired light color as the light-emitting device 1, The GaN-type blue LED chip which radiates | emits blue light whose light emission peak wavelength is 460 nm is used suitably. In the present embodiment, the LED 2 uses a so-called face-up type element in which anode and cathode electrodes are provided on the element upper surface. As a mounting method of the LED 2, the LED 2 is bonded to the substrate 3 by the die bonding material 31, and each electrode provided on the element upper surface of the LED 2 is connected to the wiring pattern 32 provided on the substrate 3 by using the wire 33. Connect. Thereby, LED2 and the wiring pattern 32 are electrically connected. As the die bond material 31, for example, a silicone resin, a silver paste, and other high heat-resistant epoxy resin materials are used. In addition, although the example which mounts a face-up type element by wire bonding was shown here as a mounting method of LED2, LED2 may be a face-down type element which arranged an electrode on the lower surface side. For example, the LED 2 is mounted by flip chip mounting.

  As the base material, for example, a general-purpose board material such as a glass epoxy resin is preferably used as the base material. It may be a ceramic substrate such as alumina or aluminum nitride, or a metal substrate having an insulating layer on the surface. A wiring pattern 32 for supplying power to the LED 2 is provided on the substrate 3. The shape of the board | substrate 3 should just be a size and shape which can mount mounting members, such as LED2 and the wavelength conversion member 21, and thickness should just have the intensity | strength which does not produce deformation | transformation, such as bending at the time of handling.

  The wiring pattern 32 formed on the substrate 3 is formed on the Au surface by a plating method, for example. The plating method is not limited to Au, and may be Ag, Cu, Ni, or the like, for example. Further, the Au on the surface of each pattern portion may have a laminated structure such as Au / Ni / Ag, for example, in order to improve the adhesive force with the substrate 3. Note that the wiring pattern 32 may be configured so that light reflection processing is performed on the surface thereof and the light emitted from the LED 2 toward the substrate 3 is reflected. Moreover, it is preferable that the surface of the board | substrate 3 and the wiring pattern 32 is covered with the white resist except the area | region required for the connection of the wire 33 and mounting of LED2. This white resist is formed by, for example, a lift-off method. In this case, each pattern portion is protected by the white resist, so that the stability of the wiring is improved, and the handling when the light-emitting device 1 is incorporated in the lighting device is facilitated, and the manufacturing efficiency of the device is improved.

  For the wire 33, for example, a general-purpose gold wire is used. Moreover, an aluminum wire, a silver wire, or a copper wire may be used. The wire 33 is bonded to each electrode of the LED 2 and the wiring pattern 32 by a known bonding method such as thermal bonding or ultrasonic bonding.

  The wavelength conversion member 21 is made of a mixed material in which a particulate yellow phosphor that is excited by blue light emitted from the LED 2 and emits yellow light is dispersed in a translucent resin material (for example, silicone resin). An optical member produced by forming and processing into the shape described above. As the resin material having translucency, for example, a silicone resin having a refractive index of 1.2 to 1.5 is used.

  As the phosphor, a well-known yellow phosphor having a peak wavelength in the wavelength range of 500 to 650 nm, which is excited by absorbing part of the blue light emitted from the LED 2, is preferably used. This yellow phosphor has an emission peak wavelength in the yellow wavelength range and an emission wavelength range including a red wavelength range. Examples of the yellow phosphor include, but are not limited to, a so-called YAG phosphor composed of a garnet structure crystal of a composite oxide of yttrium and aluminum. For example, in order to adjust color temperature and color rendering, etc., phosphors of a plurality of colors may be mixed and used. By appropriately mixing a red phosphor and a green phosphor, white light having a high color rendering property can be obtained. Can be obtained. For example, a light diffusing material or a filler may be added to the resin material constituting the wavelength conversion member 21 in addition to the phosphor.

  As the wavelength conversion member 21, the hemispherical shape shown in the figure is used. In addition, when viewed in a longitudinal section, the thickness in the upward direction is greater than the thickness in the lateral direction of the LED 2, and is a vertically long convex shape having a vertex in the light extraction direction, and the longitudinal section has a major axis in the height direction. You may form so that it may become a semi-elliptical shape. If such a wavelength conversion member 21 is coated on the LED 2, the wavelength of the light emitted from the LED 2 is converted to emit light of any light color, and the LED 2 and the wire 33 can be protected. it can.

  As a method for forming the wavelength conversion member 21, for example, the mold containing the above-described shape is filled with a phosphor-containing resin, and the substrate 3 on which the LED 2 is mounted is turned upside down in a resin in the mold. There is a method of placing on the upper surface and curing. Moreover, the board-shaped molded product which provided the recessed part in the space where LED2 is installed is previously produced using fluorescent substance containing resin, resin similar to a molded product is filled into this recessed part, and a board | substrate is covered so that LED2 may be covered. The method of mounting on 3 and making it harden | cure may be sufficient. Further, a desired shape may be formed by applying a relatively thixotropic phosphor-containing resin on the substrate 3 on which the LED 2 is mounted using a dispenser. Moreover, the method of forming and processing so that it may become the shape of the wavelength conversion member 21 mentioned above by cutting and grind | polishing this molded object may be sufficient. The formed wavelength conversion member 21 is bonded onto the substrate 3 by the resin before the resin described above is cured or by the same resin after the resin is cured.

  The light emitted from the LED 2 is emitted radially around the light lead-out axis that passes through the approximate center of the light emitting portion. A part of the light hits the phosphor contained in the wavelength conversion member 21, the phosphor in the ground state is changed to the excited state, and the excited phosphor emits light having a wavelength different from that of the light from the LED 2. Release to the ground state. The light emitted at this time and the light emitted from the LED 2 itself are mixed, and light having a predetermined wavelength is emitted from the light emitting surface of the LED 2 (package).

  Next, how the light distribution is controlled by the optical member 4 will be described with reference to FIG. Of the light incident on the incident surface 41 of the optical member 4 from the LED 2, the light directed in the direction directly above the LED 2 is transmitted through the first transmission surface 42 while being refracted and radiated out of the optical member 4. At this time, since the first transmission surface 42 is a concave curved surface 42a, the light incident on the first transmission surface 42 is refracted and emitted to the outer peripheral side. Can be. Next, the light traveling toward the outer peripheral side from the first transmission surface 42 is totally reflected by the total reflection surface 43. The light totally reflected by the total reflection surface 43 is incident on the second transmission surface 44, and passes through the second transmission surface 44 while being refracted when the incident angle is equal to or smaller than the critical angle. As a result, the light emitting device 1 can irradiate the region on the outer peripheral side of the peripheral portion of the substrate 3 with light. Therefore, according to the light-emitting device 1 of this embodiment, light can be irradiated to the construction surface side (downward direction in the figure) of the light-emitting device 1, and ambient illuminance can be improved.

  By the way, light (not shown) whose incident angle is greater than or equal to the critical angle out of the light totally reflected by the total reflection surface 43 and incident on the second transmission surface 44 is totally reflected at the interface of the second transmission surface 44. The light is reflected and enters the total reflection surface 43 again. The total reflection surface 43 is configured as a convex saddle curved surface 43a, and the angle formed with the second transmission surface 44 becomes smaller in the vicinity of the peripheral portion. Therefore, the total reflection surface 43 is totally reflected by the second transmission surface 44 in this region. The incident angle of light to the total reflection surface 43 tends to be small. Accordingly, the light incident on the total reflection surface 43 again passes through the interface while being refracted, and is emitted in the lateral direction of the light emitting device 1.

  A light emitting device according to a modification of the present embodiment will be described with reference to FIG. In the embodiment described above, an example in which the concave portion 41 b that accommodates the substrate 3 is formed around the incident surface 41 of the optical member 4 has been described. On the other hand, as shown in FIG. 5, in the light emitting device 1 of the present modified example, the optical member 4 does not have a structure for housing the substrate 3, has a flat bottom surface, A transparent substrate 45 having the same thickness as that of No. 3 is provided. The transparent substrate 45 is formed of the same material as the optical member 4 or a material having the same refractive index, and light incident on the interface between the optical member 4 and the transparent substrate 45 is not totally reflected, Can penetrate. Therefore, in this modification, the surface of the transparent substrate 45 opposite to the optical member 4 corresponds to the second transmission surface 44 in the above embodiment. This surface may be roughened.

  According to this configuration, since the bottom surface of the optical member 4 is flat, the optical member 4 can be easily molded, and the productivity of the light-emitting device 1 using the optical member 4 can be improved.

  Next, a light emitting device according to another modification will be described with reference to FIG. As shown in FIG. 6A, the light emitting device 1 of the present modification has a substrate in which the second transmission surface 44 of the optical member 4 is directed from the inner peripheral side to the outer peripheral side of the second transmission surface 44. 3 is curved so as to be gradually separated from the plane including 3. That is, the second transmission surface 44 is formed in an inversely tapered shape that gradually increases from the peripheral edge of the substrate 3 to the peripheral edge of the total reflection surface 43. Other configurations are the same as in the above embodiment. Further, the surface of the second transmission surface 44 may be roughened.

  According to this configuration, the light emitted from the incident surface 41 to the outer peripheral side further than the total reflection surface 43 is incident on the second transmission surface 44 and is totally reflected at this interface. The light travels toward the total reflection surface 43, passes through the total reflection surface 43, and is radiated out of the optical member 4. That is, since light is also emitted from the total reflection surface 43, light can be emitted from the entire surface of the optical member 4. Further, in the present modification, when the light from the incident surface 41 is totally reflected by the total reflection surface 43 and enters the second transmission surface 44, the incident angle at this interface becomes small. Without being totally reflected by the transmissive surface 44, the light passes through the interface while being refracted. Therefore, light can be irradiated to a wide range on the construction surface side (downward direction in the drawing) of the light emitting device 1. Moreover, since the volume of the optical member 4 is small, materials, such as resin required for manufacture, can be decreased and material cost can be reduced.

  FIG. 6 shows an example in which the inversely tapered second transmission surface 44 is formed as a flat surface. However, as shown in FIG. 6B, the second transmission surface 44 is gently A curved bowl shape may be used. According to this configuration, the emission angle of the light emitted from the total reflection surface 43 can be made close to the light derivation direction of the LED 2. Thus, by changing the inclined shape of the second transmission surface 44, the spread of light in the lateral direction can be changed.

  A light emitting device according to still another modification will be described with reference to FIG. In the light emitting device 1 of this modification, a plurality of LEDs 2 are mounted on a substrate 3, and the optical member 4 is provided on the LED 2 that is close to the peripheral edge of the substrate 3 among the plurality of LEDs 2. Other configurations are the same as in the above embodiment. In the example shown in the drawing, the configuration using the optical member 4 shown in the above embodiment is shown, but the optical member 4 of the modification shown in FIG. 6 may be used.

  In the illustrated example, the LEDs 2 have a configuration in which the LEDs 2 are arranged in a grid pattern on the substrate 3. However, the present invention is not limited to this. It may be arranged. Further, a configuration in which the optical member 4 is provided on the LED 2 arranged near the center of the substrate 3 as well as the LED 2 close to the peripheral portion of the substrate 3 is shown. The LED 2 disposed near the center of the substrate 3 has a separate optical member (not shown) configured to control the light distribution of the emitted light at a wide angle and not to emit light to the substrate 3 side. It may be provided.

  According to this structure, since several LED2 is used, ambient illuminance can be improved more. In addition, ambient illuminance can be increased over a wide range.

  A light emitting device according to another modification will be described with reference to FIG. In the light emitting device 1 of this modification, a plurality of LEDs 2 are mounted on a substrate 3, and one optical member 4 is provided so as to cover the plurality of LEDs 2. In this modification, a plurality of LEDs 2 are arranged in an array on the substrate 3. However, the present invention is not limited to this, and the plurality of LEDs 2 may be arranged in a lattice shape, or may be arranged concentrically or annularly (not shown) as in the modification shown in FIG. In this modification, the accommodating part 41a in the incident surface 41 of the optical member 4 is formed large so that a plurality of LEDs 2 can be accommodated. Note that the bottom surface of the optical member 4 may be formed flat similarly to the modification shown in FIG. 5, and in this case, a transparent substrate 45 (see FIG. 5) is provided on the bottom surface of the optical member 4. Further, the peripheral portion of the optical member 4 is arranged so that the second transmission surface 44 of the optical member 4 is directed from the inner peripheral side to the outer peripheral side of the second transmission surface 44 as in the modification shown in FIG. Further, it may be curved so as to be gradually separated from the plane including the substrate 3. Other configurations are the same as those of the modification shown in FIG.

  According to this configuration, in the light emitting device 1 including the light source composed of the LED group in which the plurality of LEDs 2 are densely packed, the construction surface side of the light emitting device 1 can be irradiated with light as in the above embodiment. Ambient illuminance can be improved. In addition, as in the present modification, the emitted light of the plurality of LEDs 2 arranged in an array is reflected a plurality of times within the accommodating portion 41 a surrounded by the incident surface 41 of the optical member 4 and the substrate 3. Then, the light enters the optical member 4. Accordingly, it is possible to reduce unevenness in the brightness of the light emitted from the light emitting device 1, and it is possible to reduce the graininess peculiar to the LED light source.

  Next, a light emitting device according to a second embodiment of the present invention and a lighting device using the same will be described with reference to FIG. The light emitting device 1 of the present embodiment includes a holding member that holds the LED 2, the substrate 3, and the optical member 4. The holding member protrudes from a construction surface 6 such as a ceiling, and the optical member 4 is protruded from the construction surface 6. It is comprised so that it may hold | maintain at the position of distance. In the present embodiment, the holding member is incorporated in the bottom surface of the instrument body 5. The substrate 3 is fixed to the instrument body 5 (holding member) with screws 51. As the optical member 4, the transparent substrate 45 (see FIG. 5) described in the modification of the first embodiment may be used, and the optical member 4 having a flat bottom surface may be used (not shown). The light-emitting device 1 is provided with a diffuse transmission panel 7 so as to cover the optical member 4, and further provided with a power supply unit (not shown) to constitute a lighting device 10. The lighting device 10 is fixed to the construction surface 6 with bolts 61. In the illustrated example, the configuration using the optical member 4 shown in the first embodiment is shown, but the optical member 4 shown in FIG. 6 may be used.

  The instrument main body 5 is obtained by pressing a plate material such as an aluminum plate or a steel plate having a predetermined rigidity into the shape described above, and has the power supply unit incorporated therein. Positive and negative lead wires (not shown) are drawn out from the power source unit, and the power source unit is electrically connected to a predetermined external power feeding unit (not shown) by these lead wires. The construction surface 6 is not limited to the ceiling but may be a wall surface or the like. It is preferable that a white wallpaper or the like having a high reflectance with respect to visible light is attached to the surface of the construction surface 6.

  The diffuse transmission panel 7 is fixed to the base 52 close to the construction surface 6 of the instrument body 5, and is locked to the first panel 71 covering the second transmission surface 44 of the optical member 4, and the first panel 71. And a bowl-shaped second panel 72 that covers the second transmission surface 42 and the total reflection surface 43. The first panel 71 is screwed to the instrument body 5 with screws 53 and mainly diffuses and transmits light emitted to the construction surface 6 side of the light emitting device 1. The first panel 72 may be a clear panel without diffusibility. The second panel 72 is locked to the first panel 71 with screws or claws or the like, and diffuses and transmits light emitted to the space side opposite to the construction surface 6 of the light emitting device 1. The diffuse transmission panel 7 is a member obtained by forming and processing a milky white material obtained by adding diffusion particles such as titanium oxide to a translucent resin such as an acrylic resin into a predetermined shape. The diffuse transmission panel 7 may be a transparent glass plate or resin plate that has a rough surface or a textured surface by sandblasting the front or back surface.

  According to this configuration, the light emitted from the second transmission surface 44 of the optical member 4 is diffused and radiated by the first panel 71, so that the construction surface 6 is irradiated without uneven brightness, and has a good appearance and ambient illuminance. Can be improved. Moreover, since the light emitted from the first transmission surface 42 of the optical member 4 is diffused and emitted by the second panel 71, the occurrence of glare due to the light irradiated into the room can be suppressed.

  A light emitting device according to a modification of the second embodiment and an illumination device using the light emitting device will be described with reference to FIG. In the light emitting device 1 according to this modification, a reflection member 8 that reflects light emitted from the second transmission surface 44 in a lateral direction is provided so as to surround the instrument body 5. The instrument main body 5 has a holding frame 54 extending on the outer peripheral side of the base 52 adjacent to the construction surface 6. In this modification, the instrument main body 5 has a box shape, and a reflecting member 8 is attached to each side surface. The light-emitting device 1 is provided with a diffuse transmission panel 7 so as to cover the optical member 4, and further provided with a power supply unit (not shown) to constitute a lighting device 10. The diffuse transmission panel 7 is fixed to the periphery of the holding frame 54 with screws 55.

  The reflecting member 8 is formed in a shape curved in a concave shape toward the base portion 52 of the instrument body 5 by connecting the peripheral edge of the holding frame 54 from the joint portion between the optical member 4 and the instrument body 5. The reflecting member 8 is preferably a metal plate such as aluminum formed in the shape described above, or a light diffusing reflector made by coating a resin-formed plate with a highly reflective white paint. The reflecting member 8 may be one in which silver or aluminum having a high reflectance is deposited on the surface thereof.

  In this modified example, a rectangular parallelepiped box-shaped one is used for the diffuse transmission panel 7, but not limited to this, it may be formed so as to accommodate the reflecting member 8. A screw hole (not shown) is formed in the peripheral portion of the diffuse transmission panel 7, and a screw 55 is inserted into the screw hole and fixed to the peripheral portion of the holding frame 54. The screw hole is preferably formed with a countersink for receiving the screw head of the screw 55. By doing so, it is possible to prevent the screw head of the screw 55 from blocking the irradiation light.

  According to this configuration, of the light emitted from the second transmission surface 44 of the optical member 4, the light irradiated near the base portion 52 of the instrument body 5 is reflected in the lateral direction by the reflecting member 8. Therefore, light can be irradiated to a wider range of the construction surface 6 and ambient illuminance in a wide space can be improved.

  A light-emitting device and a lighting device using the light-emitting device according to another modification will be described with reference to FIG. In the light emitting device 1 according to this modification, as in the modification shown in FIG. 7, a plurality of LEDs 2 are provided on the substrate 3, and the optical member 4 is disposed on the LED 2 adjacent to the peripheral edge of the substrate 3, Further, the holding member is further provided. Further, the transparent substrate 45 shown in FIG. 5 is disposed around the substrate 3. Note that the optical member 4 covering the plurality of LEDs 2 shown in FIG. 8 may be used. The diffusing and transmitting panel 7 and the reflecting member 8 shown in FIG. 10 are attached to the light emitting device 1, and a power supply unit and the like (not shown) are further provided to constitute the lighting device 10.

  According to this structure, since several LED2 is used, ambient illuminance can be improved more and ambient illuminance can be made high over a wide range.

  Further, a light emitting device according to another modification and an illumination device using the light emitting device will be described with reference to FIG. In the light emitting device 1 of this modification, the optical member 4 has the second transmission surface 44 from the inner peripheral side to the outer peripheral side of the second transmission surface 44, as in the modification shown in FIG. Then, the one that is curved so as to be gradually separated from the plane including the substrate 3 is used. Further, a holding member that holds the LED 2, the substrate 3, and the optical member 4 is provided, and this holding member is configured to be embedded in the construction surface 6. In this example, the holding member is incorporated in the bottom surface of the instrument body 5. The light emitting device 1 is provided with a diffuse transmission panel 7 so as to cover the optical member 4, and further provided with a power supply unit and the like (not shown) to constitute an illumination device 10. In the diffuse transmission panel 7 of this modification, the surface facing the first transmission surface 42 and the total reflection surface 43 of the optical member 4 is configured as a flat surface 73, and the surface facing the second transmission surface 44 is a flat surface. It is formed as an inclined surface 74 that is inclined so as to be tapered from the peripheral portion of 73 to the instrument body 5. Other configurations are the same as those of the modification shown in FIG.

  According to this structure, similarly to the said embodiment, light can be irradiated to the construction surface side of the light-emitting device 1, and ambient illuminance can be improved. Moreover, since the instrument main body 5 (holding member) is embedded in the construction surface 6, the part which protrudes from the construction surface 6 in the illuminating device 10 decreases, and the external appearance of the illuminating device 10 can be made slim.

  Further, a light-emitting device and a lighting device using the light-emitting device according to another modification will be described with reference to FIG. As in the modification shown in FIG. 11, the light emitting device 1 of the present modification is provided with a plurality of LEDs 2 on the substrate 3, and each LED 2 has an optical member shown in FIGS. 4 was used. The light emitting device 1 is provided with a diffuse transmission panel 7 so as to cover the optical member 4, and further provided with a power supply unit and the like (not shown) to constitute an illumination device 10. Other configurations are the same as those of the above modification.

  According to this configuration, since a plurality of LEDs 2 are used as in the above modification, the ambient illuminance can be increased over a wide range, and the appearance of the lighting device 10 can be slimmed.

  Note that the present invention is not limited to the above-described embodiment as long as the optical member 4 extends from the peripheral edge of the substrate 3 to the outer peripheral side and is configured to emit light from the bottom surface side of the optical member 4. Not limited to this, various modifications are possible. For example, in the light emitting device 1 shown in FIGS. 7, 8, 11, and 13, a plurality of LEDs having different emission colors may be used, and each light color may be mixed by the optical member 4. Further, the light emitted from the wavelength conversion member 21 is efficiently incident on the optical member 4 by making the emission surface shape of the wavelength conversion member 21 provided with the LED 2 correspond to the shape of the housing portion 41 a of the optical member 4. It can also be made.

DESCRIPTION OF SYMBOLS 1 Light-emitting device 10 Illumination device 2 LED (solid-state light emitting element)
DESCRIPTION OF SYMBOLS 3 Substrate 4 Optical member 41 Incident surface 41a Housing part 42 First transmission surface 42a Concave curved surface 43 Total reflection surface 43a Convex curved surface 44 Second transmission surface 5 Instrument body (holding member)
6 Construction surface

Claims (8)

A solid-state light-emitting element, a substrate on which the solid-state light-emitting element is mounted, and an optical member provided in the light-derived direction of the solid-state light-emitting element,
The optical member is
It is arranged so as to cover the solid-state light emitting element and the substrate, and is extended to the outer peripheral side than the peripheral portion of the substrate,
Opposite the solid-state light-emitting element, an incident surface on which light emitted from the solid-state light-emitting element is incident;
A first transmission surface facing the incident surface and transmitting light incident from the incident surface;
A total reflection surface located on the outer peripheral side of the first transmission surface and totally reflecting the light incident from the incident surface;
A light emitting device comprising: a second transmission surface that is located on an outer peripheral side of the peripheral portion of the substrate and transmits light totally reflected by the total reflection surface. The incident surface has a concave accommodating portion for accommodating the solid state light emitting device,
The first transmission surface has a concave curved surface that is concave toward the solid-state light emitting element.
The light emitting device according to claim 1, wherein the total reflection surface has a convex curved surface that is convex in a light leading direction of the solid state light emitting device. A plurality of solid state light emitting devices are mounted on the substrate,
The light-emitting device according to claim 1, wherein the optical member is provided in a solid-state light-emitting element that is at least close to a peripheral portion of the substrate among the plurality of solid-state light-emitting elements. A plurality of solid state light emitting devices are mounted on the substrate,
The light emitting device according to claim 1, wherein the optical member is provided so as to cover the plurality of solid state light emitting elements.   5. The second transmission surface according to claim 1, wherein the second transmission surface is curved so as to be gradually separated from a plane including the substrate from an inner peripheral side to an outer peripheral side. 6. Light emitting device. A holding member for holding the solid-state light emitting element, the substrate, and the optical member;
The said holding member protrudes from a construction surface, It is comprised so that the said optical member may be hold | maintained in the position of predetermined distance from the said construction surface, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The light emitting device according to 1. A holding member for holding the solid-state light emitting element, the substrate, and the optical member;
The light emitting device according to claim 5, wherein the holding member is configured to be embedded in a construction surface.   An illumination device using the light emitting device according to any one of claims 1 to 7.

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