JP5449098B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device. In particular, the present invention relates to an apparatus that can be used as a small to large luminaire or a display luminaire using a light emitting diode (LED) as a light source.

  Many lighting device configurations using LEDs have been proposed so far. However, in a configuration in which LEDs are simply arranged and light-controlled by a reflector or the like, considerable discomfort glare or reduction occurs when the light source is expected. There are many cases where high-performance glare occurs, and this tendency has been increasing with the recent improvement in the luminous efficiency of LEDs. In other words, the conventional lighting devices or lighting fixtures using LEDs have a strong purpose of efficiently illuminating the lower direction efficiently, and there is a problem such as glare when the device is viewed, and there is little illumination light in the direction other than the lower direction of the device. However, there is a problem that the brightness of the entire space where the apparatus is installed is insufficient. For this reason, an apparatus that illuminates a wide space with soft light using a thin surface light source using a light guide plate has been proposed (see, for example, Patent Documents 1 and 2).

JP 2007-334151 A JP 2006-236770 A

  Conventionally, in a lighting device using a light guide plate, a light source is disposed on the end face of the light guide plate, so that a frame surrounding the light source is required, and the light distribution design freedom and design (designability) of the device are often limited. For example, the configuration of Patent Document 1 is an example of a configuration of an illumination device that emits a large luminous flux. However, since a light source is disposed on the end surface (all end surfaces) of the light guide plate, it is essential to provide a light source storage frame around the light source plate. It was. On the other hand, the configuration of Patent Document 2 is an example in which a side-emitting LED having a large relative radiation intensity in the side surface direction of the LED is used, and although there are various optical problems, the LED is arranged in the central portion of the light guide plate, and the frame is A surface light emitting device having no or a narrow width is realized.

  Patent Document 2 describes light guide plate peripheral reflector conditions for the purpose of achieving uniform luminance at the periphery of the light guide plate, with respect to the configuration of a surface illumination device such as a backlight. However, in practice, the side-emitting LED usually emits light also on the front side, and this component has such intensity that it cannot be ignored. Therefore, in this configuration, there are not many undulations in the luminance distribution according to the LED arrangement position, and the luminance unevenness often appears. In particular, when the light guide plate is directly expected, there is a problem that glare (unpleasant glare) according to the LED arrangement is often felt.

  In addition, in the configurations of Patent Documents 1 and 2, the end of the light guide plate is covered with a casing for the purpose of improving surface illumination efficiency and uniformity. However, when this is used as it is as a lighting device, light is directed toward the ceiling surface. There is a problem that it is difficult to spread and it is difficult to obtain a feeling of brightness and a feeling of openness as a whole lighting space.

  An object of the present invention is, for example, to reduce unpleasant glare when a lighting device is expected. In addition, for example, it realizes large luminous flux emission while reducing unpleasant glare when looking at the illumination device, and further enhances the brightness of the entire illumination space by providing not only the device but also the surrounding light distribution component An object of the present invention is to obtain a lighting device with good luminous efficiency (in other words, energy saving efficiency). Furthermore, for example, when a single color LED is used in such a low glare illumination device, it is also possible to easily change the light color using a color conversion member according to a user's request or the like. And That is, an object of the present invention is to obtain a low-glare large-light-beam thin illuminating device in which the degree of freedom in design such as light characteristics such as light distribution, color light, and design (designability) of the illuminating device is enhanced.

A lighting device according to one embodiment of the present invention includes:
A light guide plate having a front surface and a back surface, and provided with a hole having an opening in the front surface, wherein the light is incident from an inner wall surface of the hole, and the incident light is emitted from the surface;
An LED that emits light, and that is housed in the hole of the light guide plate such that an optical axis is substantially perpendicular to the surface of the light guide plate;
A light control member that is attached to the surface of the light guide plate so as to cover the opening of the hole of the light guide plate, and that blocks at least a part of light emitted from the LED in the optical axis direction of the LED.

  In one aspect of the present invention, the lighting device includes a light control member attached to the surface of the light guide plate so as to cover the opening of the hole of the light guide plate. The light control member blocks at least a part of light emitted in the direction of the optical axis of the LED from the LED housed in the hole of the light guide plate so that the optical axis is substantially perpendicular to the surface of the light guide plate. Therefore, unpleasant glare when the lighting device is expected is reduced.

FIG. 5 shows a structural example of a lighting device according to Embodiment 1; The figure which shows the light distribution characteristic of commercially available side emission LED. FIG. 6 illustrates a configuration example of a lighting device according to a modification of the first embodiment. FIG. 6 illustrates a configuration example of a lighting device according to a modification of the first embodiment. FIG. 6 illustrates a configuration example of a lighting device according to Embodiment 2. FIG. 10 illustrates a configuration example of a lighting device according to a modification of the second embodiment. The figure which shows the emission spectrum before and behind application of the color conversion member of the illuminating device which concerns on Embodiment 2. FIG. FIG. 9 shows a structural example of a lighting device according to Embodiment 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the cross-sectional view, hatching is used for the sake of convenience, not to represent the cross section but to distinguish the members.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a configuration example of a lighting device 10 according to the present embodiment. Fig.1 (a) is sectional drawing of the illuminating device 10 which looked upward in the position of the C dotted line of FIG.1 (b). FIG.1 (b) is sectional drawing of the illuminating device 10 (a part) seen in the position of the A dotted line of Fig.1 (a). FIG.1 (c) is sectional drawing of the illuminating device 10 seen in the position of the B dotted line of Fig.1 (a).

  1A to 1C, an illumination device 10 includes an LED substrate 11 and a side-emitting LED 12 (LED package) mounted thereon. In the present embodiment, five LEDs 12 are mounted in a line (straight), but the number and arrangement of the LEDs 12 are not limited to this. Four or less LEDs 12 may be mounted, or six or more LEDs 12 may be mounted. The LEDs 12 may be arranged linearly in a plurality of rows, may be arranged in a ring shape (annular shape), may be arranged radially, or may be arranged randomly.

  On the surface of the LED substrate 11, a light guide plate 13 having an opening 14 in which the LED 12 is accommodated at a position corresponding to the LED 12 is disposed so as to sandwich a reflective sheet 16 having a high reflectance. The light guide plate 13 is an optical member that realizes surface light emission by a light control pattern (diffusion pattern) added to the surface of the light guide plate 13 while conveying the light from the LEDs 12 to a distant place. Here, the light guide plate 13 is made of a highly transparent material such as acrylic or polycarbonate. Although not shown, as the light control pattern, white ink is silk-printed as fine dots having different diameters depending on the position on the light guide plate 13 or on the light guide plate 13 according to the position on the light guide plate 13. In addition, a blast process with gradation applied directly, or a concavo-convex pattern formed by laser processing on the light guide plate 13 can be used. It is desirable that the pattern density of the light control pattern increases as the distance from the light source (LED 12) increases. The light traveling through the light guide plate 13 can be redirected by this light control pattern, and part of the light exits the light guide plate 13 to become illumination light, and another part is propagated in the light guide plate 13 and emitted from different locations. Illumination light. As a result, light is emitted substantially uniformly from the surface of the light guide plate 13.

  In addition to the light guide plate 13 having a light control pattern formed on the surface, a light propagation material obtained by mixing a light diffusing material (glass fine particles, ceramic powder, etc.) into a resin material is processed into a plate shape, etc. May be used.

  The LED substrate 11 has a configuration in which a mounting pattern and a wiring pattern of the LED 12 are provided on a glass epoxy or aluminum plate material subjected to surface insulation treatment. In the case where the input power of the LED 12 is large, the LED 12 is made of a metal substrate (aluminum, copper, iron, etc.) or a high heat dissipation or high thermal conductivity material such as ceramic (alumina, aluminum nitride). In the present embodiment, the back surface (back surface) of the LED substrate 11 is attached to or stored in the metal casing 17. Although not shown, especially when handling a high-power LED 12, the back surface of the LED substrate 11 is attached to the housing 17 via a heat conductive sheet so as not to cause a decrease in light emission efficiency due to a temperature rise due to self-heating of the LED 12. Take a configuration such as close contact. With such a configuration, an extreme temperature rise of the LED 12 can be suppressed, so that the lighting device 10 with good luminous efficiency can be obtained.

  Here, the LED 12 is an LED called a side emitter that has a large amount of lateral light emission, and is characterized by its light distribution characteristics. FIG. 2 shows the light distribution characteristic (angle light radiation distribution characteristic) of an existing LED product (commercially available side-emitting LED) having such characteristics. For example, Fig. 2 (a) shows the ratio of the light emitted from the Sanken Electric Co., Ltd. LED, SELT1WA13CM, with the LED emission center at the 0 degree direction (directly above the LED) and the emission angle at the side. Indicates whether or not FIG. 2B shows the relative intensity on the vertical axis with respect to the radiation angle on the horizontal axis for Luxeon (registered trademark) Emitter, which is an LED manufactured by Philips, Lumileds, and Lighting. FIG. 2C shows the characteristics of LW / W5KM, which is an LED manufactured by OSRAM / Opto / Semiconductors, in both types of graphs of FIG. 2 (a) and FIG. 2 (b). Each of the characteristics shown in FIGS. 2A to 2C has a very large lateral emission ratio. Although these LEDs have different appearance shapes, they all have a light control lens, the light direction is determined according to the Fresnel transmission / reflection law at the lens interface, and light emission is suppressed in the LED center direction as shown in FIG. Thus, the amount of radiation of the side radiation component is designed to be larger in the LED side surface direction than in all directions around the LED.

  FIG. 1B shows the configuration of the peripheral part of the LED 12, but since the side-emitting LED as described above is used, the amount of light emitted along the central optical axis of the LED 12 is larger than that of the LED 12. The amount of light emitted to the side of the LED 12 is large. Therefore, as shown in FIG. 1B, the light guide plate 13 having the opening 14 is disposed in the peripheral region of the LED 12, and the opening 14 is provided to increase the light transmittance from the side surface of the opening 14 to the inside of the light guide plate 13. By making the surface of the inner wall polished so as not to be uneven, the side emitted light of the side-emitting LED 12 can be efficiently incident on the light guide plate 13. Here, if the opening diameter of the opening 14 is as close as possible to the outer diameter of the LED 12, light reflection inside the opening 14 can be suppressed.

  Even if the LED 12 is a side-emitting type, the LED 12 also has a component that irradiates in the optical axis direction (directly below the apparatus in the configuration of FIG. 1). Only when the openings 14 are scattered in the vertical direction (when viewed from the vertical direction), there are cases where the glare and unpleasant glare occur. Therefore, a semi-translucent light control member 15 such as a thin diffusion resin sheet is attached to the opening 14. As a result, the light intensity emitted from the opening 14 can be suppressed, and a light component reflected to the inside of the opening 14 can be obtained, and part of the light is emitted through the light guide plate 13, so that the luminous efficiency with reduced glare is achieved. Can be obtained. Further, as the light control member 15 that covers the mouth of the opening 14, a light blocking member that has a large amount of light (flux) reflected at least toward the LED 12 may be used. In this case, the opening 14 becomes a non-light-emitting portion when the device is viewed, but the internal reflectance can be increased by that amount, and as a result, the light propagated inside the light guide plate 13 is increased, and the light emission An efficient lighting device 10 can be obtained.

  As described above, in the present embodiment, the illuminating device 10 has the light guide plate 13 provided with the opening 14 (hole) having an opening on the surface (the lower surface in the case of the illuminating device 10 installed on the ceiling surface). The LED 12 housed in the opening 14 so that the optical axis is substantially perpendicular to the surface of the light guide plate 13, and the light control member 15 attached to the surface of the light guide plate 13 so as to cover the mouth of the opening 14. With. As shown in FIG. 1B, the light guide plate 13 enters light emitted from the LEDs 12 from the inner wall surface of the opening 14 and emits the incident light from the surface. The light control member 15 blocks at least part of the light emitted from the LED 12 in the optical axis direction of the LED 12. For this reason, the discomfort glare at the time of expecting the illuminating device 10 can be reduced.

  In the present embodiment, the LED 12 is a type (for example, side-emitting type) LED in which the light intensity in the non-axis direction, which is a direction inclined by a predetermined angle from the optical axis, is larger than the light intensity in the optical axis direction. As shown in FIG. 1B, the light guide plate 13 makes light emitted from at least the LED 12 in the non-axis direction of the LED 12 incident from the inner wall surface of the opening 14. For this reason, the illuminating device 10 with high luminous efficiency can be provided.

  As shown in FIG. 1B, in the present embodiment, the light control member 15 reflects light emitted from the LED 12 in the optical axis direction of the LED 12 to the inside of the opening 14. The light guide plate 13 makes light reflected by the light control member 15 incident from the inner wall surface of the opening 14. For this reason, the illuminating device 10 with higher luminous efficiency can be provided.

  The illumination device 10 according to the present embodiment described above is different from the side light type as in Patent Document 1 in which a well-known LED light source is disposed on the side surface of the light guide plate. A wide frame used for the purpose of protection and light leakage prevention is unnecessary. In the illumination device 10 according to the present embodiment, the LED 12 can be arranged in the center of the light guide plate 13 without a frame. In the present embodiment, whether or not the frame (housing 17) is provided around the light guide plate 13 regardless of the size of the light guide plate 13 may be determined from the viewpoint of the design of the lighting device 10 and the device light distribution. There is an advantage that the width can be increased.

  FIG. 3 is a diagram illustrating a configuration example of the illumination device 10 according to a modification of the present embodiment. 3A to 3D are cross-sectional views of the illumination device 10 corresponding to FIG.

  Each of the examples of FIGS. 3A to 3D has an edge of the light guide plate 13 without providing a frame (housing 17) at the end portions 18a and 18b (terminal portions) of the light guide plate 13 particularly from the above viewpoint. This is a device configuration that actively uses the light emitted from the portions 18a and 18b to thereby enhance the lighting effect of the space. By using the end portions 18a, b of the light guide plate 13 as light emitting surfaces, the end portions 18a, b of the light guide plate 13 are used when the lighting device 10 is placed near the ceiling (directly attached or suspended). It is also possible to illuminate the ceiling via this, and as a result, it is possible to enhance the feeling of brightness and openness of the illumination space. Further, as shown in FIGS. 3A to 3D, various effect spaces can be obtained by changing the light emission direction according to the shape of the end 18b of the light guide plate 13 itself and the uneven state of the surface of the end 18a. It can be made to correspond. The shapes of the end portions 18a and 18b of the light guide plate 13 remain rectangular in FIG. 3A, wedge shapes in FIGS. 3B and 3C, and curved shapes in FIG. Is approximately semi-circle). In each figure, an example of a light beam that travels inside the light guide plate 13 and goes out is indicated by an arrow. For example, as shown in FIGS. 3B and 3C, the light guide plate 13 is formed so that the thickness decreases as it goes away from the light source (that is, in a wedge shape), so that light is conveyed toward the tip of the light guide plate 13. The design range of the illumination device 10 when the device light emitting unit is expected can be widened.

  In the example of FIGS. 3A to 3D, the end 18a of the light guide plate 13 is subjected to fine unevenness processing or the like, so that the diffusion light emission ratio can be increased according to the processing ratio, and the end of the light guide plate 13 can be increased. It is possible to brighten the illumination space with soft light that suppresses glare from the portion 18a. Similar to the diffusion pattern of a general light guide plate, the fine irregularities may be those transferred by gold at the time of manufacturing the light guide plate 13, may be provided by laser processing, blasting, or the like, or silk-printed (dot coating) It may be a thing. It is to be noted that a similar effect can be obtained even if a diffusion sheet or a diffusion tape having diffusion translucency is provided on the end portion 18a of the light guide plate 13 instead of fine unevenness.

  On the other hand, since the end portion 18b of the light guide plate 13 is a flat surface without any uneven processing on the surface, the light traveling through the end portion 18b of the light guide plate 13 is emitted as relatively sharp light according to Snell's law. The brightness of the light emitting surface of the device 10 can be enhanced.

  In the example of FIG. 3A, the inside of the light control member 15 is a conical highly reflective material 15a. For this reason, most of the surface reflected light can be controlled to the light guide plate 13 side. The conical portion of the light control member 15 may be a transparent resin having an uneven surface with a polished conical surface. In this case, the light can be controlled to the light guide plate 13 side by the interface reflection of the resin. As a result, it is possible to obtain the illumination device 10 having good light emission efficiency from the surface of the light guide plate 13.

  As described above, in the example of FIG. 3A, the light control member 15 is formed in a conical shape whose apex faces the LED 12 side, and reflects light emitted from the LED 12 in the optical axis direction of the LED 12 on the conical surface. Thereby, since the light flux of the light reflected by the light control member 15 and incident from the inner wall surface of the opening 14 increases, the illumination device 10 with higher luminous efficiency can be provided. In the configuration shown in FIG. 1C, or in the examples of FIGS. 3B to 3D, the light control member 15 may be similarly formed in a conical shape. The effect of can be obtained. The light control member 15 may be formed in a pyramid shape or other shapes. In particular, when the opening 14 is not substantially circular in plan view as in the present embodiment, it is desirable to change the shape of the light control member 15 according to the shape of the opening 14. For example, if the opening 14 is elliptical in plan view, the light control member 15 is in the shape of an elliptical cone, and if the opening 14 is rectangular in plan view, the light control member 15 is in the shape of a quadrangular pyramid, etc. Can be considered.

  3A to 3D, the light guide plate 13 emits light incident from the inner wall surface of the opening 14 not only from the surface but also from at least one end surface. For example, as in the example of FIGS. 3A to 3D, the end surface that emits light (the end surface on the end 18 a side) is subjected to a process of diffusing light, or diffusion that diffuses light. If the material is attached, it is possible to irradiate soft light around the side of the lighting device 10. Also, the brightness is increased. Further, for example, as in the example of FIG. 3B, if the end 18 b having the end surface that emits light is formed so that the thickness decreases as it approaches the tip, the side periphery of the lighting device 10 More light can be irradiated. 3A to 3D, both end portions 18a and 18b of the light guide plate 13 may be configured in the same manner.

  FIG. 4 is a diagram illustrating a configuration example of the illumination device 10 according to another modification. 4 (a) and 4 (d) are cross-sectional views of the illumination device 10 corresponding to FIG. 1 (c). FIGS. 4B and 4C are perspective views of the illumination device 10.

  When the illuminating device 10 also serves as ceiling surface illumination or the like, in addition to the light emission effect of the end portions 18a and 18b of the light guide plate 13, as shown in the examples of FIGS. An opening 22 is provided at regular intervals (at regular positions), or a part of the reflection sheet 16 on the back side of the light guide plate 13 is cut out in a predetermined shape as shown in the example of FIG. By providing the portion 24, it is possible to illuminate the space on the back side of the apparatus. In particular, when the lighting device 10 is installed with a gap on the ceiling surface, or is used by being suspended from the ceiling, the effect of lighting space is exhibited.

  4A to 4D, a wide reflecting plate 21 is provided around the back side of the light guide plate 13. As a result, it is possible to emit soft light from the surface of the light guide plate 13 and further reflect the light radiated from the end portions 18a and 18b through the light guide plate 13 by the reflection plate 21 to be used as ambient illumination light. The shape of the reflecting plate 21 may be a plane as shown in FIG. 4A or a curved surface as shown in FIG. 4D, and the rising of the reflecting plate 21 according to the required amount of illumination light in the center direction of the lighting device 10. The angle and curvature can be adjusted. A wide light distribution illumination device 10 can be obtained by widening the angle of the reflection plate 21, and a narrow light distribution illumination device 10 can be obtained by providing a longer reflection plate 21 by narrowing the angle of the reflection plate 21. it can. Further, the light guide plate 13 and the side-emitting LED 12 may be shared so that the casing 17 having the reflection plate 21 can be replaced. In this case, the arrangement required for each illumination space is possible. The reflecting plate 21 that realizes light can be selected and used.

  In the example of FIG. 4A, a light diffusing member 23 such as a thin diffusing resin sheet or a semi-thick diffusing plate is disposed on the surface of the light guide plate 13. Therefore, it becomes possible to realize a soft illumination that prevents glare more.

  As described above, in the example shown in FIGS. 4A to 4D, the opening 22 is provided in a part of the reflection surface of the reflection plate 21 extended to the housing 17. For this reason, especially the terminal light emission from the light guide plate 13 configured in a state in which the end portions 18a and 18b emit light can be passed to the outside of the reflection plate 21, and this is illuminated in the surrounding space where the illumination device 10 is disposed. It can be used as light. With such a configuration, it is possible to increase a feeling of brightness around the apparatus and a feeling of opening of the space.

  In the example of FIG. 4C, the light control member 15 is arranged as a rectangular member. As described above, the light control member 15 may be an integral type as long as it is configured to cover at least the mouth of the opening 14 in which the LEDs 12 are arranged. In this case, glare suppression and light incident efficiency to the light guide plate 13 are possible. Can be improved, and the lighting device 10 with good luminous efficiency can be obtained.

  In the example of FIG. 4D, an opening 24 is provided in a part of the back surface of the light guide plate 13 so that the reflection sheet 16 and the housing 17 can transmit light simultaneously. With this configuration, for example, when the lighting device 10 is suspended and used, it is possible to illuminate the space on the back side of the device (for example, the ceiling surface side), and the effect of increasing the brightness of the lighting space can be obtained. In addition, in order to prevent dust from accumulating in the opening part 24, if it is set as the structure which provides the translucent resin sheet and diffusion plate which cover the opening part 24, although the intensity | strength of light will fall a little, it is the objective. An effect can be obtained.

  As described above, in the example of FIGS. 4A to 4D, the illumination device 10 is provided at a predetermined distance from the end face (the end face of the end portions 18a and 18b) that emits light from the light guide plate 13. A reflector 21 is provided. Since the reflection plate 21 reflects light emitted from the end face in a desired direction (which can be adjusted by the shape and angle of the reflection surface of the reflection plate 21), the reflection plate 21 irradiates more light in the direction (for example, downward). be able to.

  4D, the lighting device 10 is attached to the back surface of the light guide plate 13, and reflects the light reaching the back surface of the light guide plate 13 to the inside of the light guide plate 13 (reflecting material). And a housing 17 that houses the light guide plate 13 together with the reflection sheet 16. The housing 17 has one surface (for example, a lower surface) opened so that the surface of the light guide plate 13 is exposed, and a surface opposite to the one surface so that a part of the rear surface of the light guide plate 13 is exposed ( For example, at least one opening 24 is provided on the upper surface. The opening 24 is a hole that penetrates the casing 17 together with the reflection sheet 16, and allows a part of the light reaching the back surface of the light guide plate 13 to pass therethrough. For this reason, not only light can be irradiated from the surface of the light guide plate 13 (for example, to the floor surface), but also light can be irradiated from the back surface of the light guide plate 13 (for example, to the ceiling surface). Note that the amount of light irradiated from the back surface of the light guide plate 13 to the outside can be adjusted by the shape and size of the opening 24.

  In the lighting device 10 according to the present embodiment, at least two types of LEDs 12 may be used, and at least one type of the LEDs 12 may be dimmable. Thereby, it can also be set as the illuminating device 10 which can electrically change color.

  In the present embodiment, side emission type LEDs are used as the LEDs 12 in terms of light utilization efficiency, but even if a normal bullet-type LED or diffuse light-emitting LED is used, the side radiation component is small. Although the light emission efficiency may be slightly reduced (desired to increase the ratio of the reflected light utilization at the light control member 15 of the front radiation light), the same effect can be obtained from the viewpoint of low glare illumination. Therefore, an LED other than a side-emitting LED such as a bullet-type LED or a diffuse light-emitting LED may be used as the light source of the illumination device 10.

  As described above, in the present embodiment, the illumination device 10 is provided around the LED board 11 on which the LED 12 having one or a plurality of side-emitting light emission functions is mounted, and the individual LEDs 12 on the LED board 11. A light guide plate 13 having an opening 14. Then, at least the upper part of the opening 14 around the LED 12 (the surface side of the light guide plate 13) is semi-translucent, or at least the surface facing the LED 12 has a high reflectivity and has light shielding properties. A member 15 is provided. Further, the thickness of the light guide plate 13 changes toward the end portions 18a and 18b, or a concavo-convex shape is added to the surface, or a part thereof is exposed.

  With the configuration as described above, in the present embodiment, a large luminous flux emission is realized while reducing unpleasant glare when the illumination device 10 is viewed, and illumination is provided not only directly under the device but also having a peripheral light distribution component. It is possible to obtain the lighting device 10 with good luminous efficiency (in other words, energy saving efficiency) that can enhance the brightness of the entire space. Moreover, in this embodiment, although it is a low-glare illumination device that realizes wide surface light emission without a frame, the ceiling surface can be illuminated by devising the light guide plate 13 and the device structure. It is possible to obtain a thin illuminating device with good luminous efficiency, which can be increased, and the degree of freedom of device light distribution and design is enhanced.

  In the present embodiment, the lighting device 10 includes, for example, lighting fixtures such as general lighting and effect lighting, special lighting for museums, medical use, etc., built-in lighting devices for equipment such as showcases and refrigerators, advertising lights, etc. It can be used as a back lighting device.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 5 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. Fig.5 (a) is sectional drawing of the illuminating device 10 corresponding to FIG.1 (c). FIG. 5B is a perspective view of the color conversion member 19 of the lighting device 10.

  In the illuminating device 10 that emits soft light with less unpleasant glare as in the first embodiment, when the emission color of the LED 12 cannot be adjusted electrically, the LED substrate 11 has a different light color for the purpose of changing its light color. Replacing the LED substrate 11 on which the LED 12 is mounted requires electric work and is very troublesome. On the other hand, in the present embodiment, the light emission color can be easily set by changing the light emission color to a desired light emission color by the configuration using the characteristic color conversion member 19 described below and making it detachable. it can.

  As shown to Fig.5 (a), in this Embodiment, it is set as the structure which comprised the color conversion member 19 on the surface of the inner wall of the opening part 14 surrounding LED12. That is, the illumination device 10 includes a color conversion member 19 that is attached to the inner wall surface of the opening 14 of the light guide plate 13 and converts the color of light. As shown in FIG. 5B, the color conversion member 19 is formed in a ring shape, for example, by matching a material such as a phosphor in which a phosphor excited by the light emitted from the side-emitting LED 12 is dispersed in a resin binder. It is set as a member. The color conversion member 19 is fitted into the opening 14 and mounted. For example, when the LED 12 is JIS (Japanese Industrial Standard) daylight color or day white color and it is desired to convert it into a low color temperature white, warm white, light bulb color, etc., for example, a nitride red phosphor is used as a silicone material or other The color conversion member 19 is made of a material mixed with a transparent resin or glass material. The light color may be adjusted by mixing a green phosphor such as silicate or an orange phosphor. Silicone is a material used also as a sealing material for the LED 12, and is a material that is transparent, has excellent light resistance, heat resistance, moldability, and flexibility. On the other hand, when the LED 12 that emits blue light is used, when it is desired to obtain a substantially white color, the color conversion member 19 is made of a color conversion material containing a yellow phosphor such as a yellow light emitting silicate phosphor or a YAG phosphor material. What is necessary is just to comprise. Thus, the color of the light emitted by the LED 12 may be any of daylight color, day white color, white color, warm white color, light bulb color, and other colors such as blue color among JIS illumination colors. Good.

  As described above, since the radiation component in the side surface direction of the LED 12 is strong in the present embodiment, the color conversion member 19 is efficiently arranged on the inner wall surface of the opening 14 of the light guide plate 13 to which the LED 12 is irradiated. Can be converted to the light color.

  By using the LED 12 in the region where the light color is four colors of JIS illumination (from the color temperature high to daylight color, day white color, white color, warm white color), it is used in a certain illumination color at the time of non-color conversion, and the color conversion member 19 at the time of conversion. Thus, it is possible to provide the illumination device 10 that emits light in a JIS illumination color of daylight white color to light bulb color having a color temperature lower than each of the above colors. Therefore, the lighting device 10 selects use / non-use of the color conversion member 19 according to the scene to be used, and when using it, selects the type of the color conversion member 19 (the phosphor type and the mixing amount are selected). And can be used as general illumination with the desired illumination light color.

For example, in the illuminating device 10 that employs the configuration of FIG. 5A and uses the daytime white LED 12, the emission spectrum before the color conversion member 19 is mounted (applied) and the color conversion by mounting the color conversion member 19 The emission spectrum after performing (wavelength conversion) is shown in FIG. In this example, the color conversion member 19 is a material in which an appropriate amount of a nitride red phosphor (CaAlSiN ₃ ; Eu) having a peak near 655 nm (nanometer) is mixed. Before the color conversion member 19 is mounted, the color temperature is about 5000 K (Kelvin), that is, the emission color is neutral white. On the other hand, after the color conversion member 19 is mounted, the color temperature changes to about 4000 K, that is, the emission color is converted to white.

  In addition, when the light color of the LED 12 is blue, since there are a variety of phosphors that excite blue light and emit light of a different color, the four color JIS illuminations are used by adjusting the color conversion member 19. Can also be converted into a wide range of lighting colors. For example, it is possible to change to a colorful illumination color with high saturation for production illumination or a JIS illumination color for general illumination.

  FIG. 6 is a diagram illustrating a configuration example of the illumination device 10 according to a modification of the present embodiment. 6 (a) and 6 (b) are perspective views of the color conversion member 19 and the like of the lighting device 10 corresponding to FIG. 5 (b). FIGS. 6C to 6E are perspective views of the illumination device 10 corresponding to FIG.

  In the illuminating device 10 shown in FIG. 5A, the color conversion member 19 has a ring shape as shown in FIG. 5B, but the color conversion member 19 and the light control member 15 are integrated. It may be configured as one part. For example, the color conversion member 19 may be integrally formed with the light control member 15 or may be detachably attached to the light guide plate 13 as one component together with the light control member 15. In the example of FIG. 6A, the color conversion member 19 and the light control member 15 are integrated and detachable members by fitting the column 20 of the light control member 15 to the color conversion member 19. By using such a detachable member, the light color can be easily changed.

  In the example of FIGS. 6B and 6C, the member that closes the opening 14 is also the color conversion member 19. That is, the light control member 15 converts the color of part of the light emitted from the LED 12 in the optical axis direction of the LED 12 as the color conversion member 19 and emits the light whose color has been converted to the outside. Even with this configuration, it is easy to attach and detach, and the color can be changed easily. The color conversion member 19 may be a separate part for the part attached to the side surface of the opening 14 and the part attached to the mouth of the opening 14, but as shown in FIG. The parts are easier to install. The color conversion member 19 is formed by molding a material such as silicone rubber mixed with a phosphor.

  In the example of FIG. 6D, a color conversion member 19 that covers the mouth of the opening 14 is further provided in the same configuration as the illumination device 10 shown in FIG. That is, in this example, the mouth of the opening 14 is covered with the color conversion member 19, and further, it is covered with the light control member 15. In this case, for example, considering the color conversion efficiency, the back surface of the light control member 15 is made a high reflectance member, and the color conversion member 19 is adhered to the color conversion member 19 using a transparent special adhesive or the like. Thus, the color conversion efficiency and reflection efficiency of the light can be increased.

  Note that the thickness and shape of the ring of the ring-shaped color conversion member 19 may be adjusted according to the required color and light emission efficiency (characteristics). In the configuration shown here, since the color conversion can be efficiently performed without the configuration in which the color conversion member 19 is provided on the entire surface of the light guide plate 13, the amount of the color conversion material used can be reduced. As a result, the color conversion member 19 and the illumination device 10 can be made inexpensive. As described above, if the opening 14 is a circular hole, color conversion to an arbitrary light color is performed even by fitting and detaching only the ring-shaped color conversion member 19 according to the size. be able to. That is, by preparing in advance the color conversion member 19 that matches the opening 14 of the light guide plate 13, a low-glare illumination device that can be easily converted to a desired light color by simple attachment and detachment can be obtained.

  In the example of FIG. 6E, the color conversion member 19 is not disposed on the inner surface of the opening 14 of the light guide plate 13 but is attached to the end 18 b of the light guide plate 13. That is, the illuminating device 10 includes a color conversion member 19 that is attached to an end face that emits light of the light guide plate 13 (an end face on the end 18b side) and converts the color of the light. In this example, the color conversion member 19 is attached only in the direction of the device attachment side among the exposed end portions 18a and 18b of the light guide plate 13. By doing so, it is possible to change the color of the illumination light in the direction directly below the apparatus and the color of the light in the direction on the back of the apparatus (for example, the ceiling surface direction when directly attached to the ceiling or suspended). For example, it is possible to produce an illumination effect in accordance with a space such as white in the downward direction and a bulb color on the ceiling. Alternatively, the color conversion member 19 may be attached to the side surface of the opening 14 of the light guide plate 13 and color conversion may be performed once, and then the second color conversion may be performed with the configuration as in this example. Further, depending on the desired lighting effect, the color conversion member 19 may be disposed so as to cover both the upper and lower surfaces of the end portion 18b of the light guide plate 13 including the downward direction of the apparatus. In this case as well, the illumination color can be easily changed by making the color conversion member 19 removable.

  As described above, in the present embodiment, the color conversion member 19 is provided on the inner surface of the opening 14 of the light guide plate 13. Therefore, when the single-color LED 12 is used in the low-glare illumination device 10 similar to the first embodiment, the light color can be easily changed using the color conversion member 19 according to the user's request or the like. become. That is, it is possible to obtain a low-glare large-light-beam thin illuminating device in which the degree of freedom in design such as light characteristics of the illuminating device 10, light characteristics such as color light, and design (designability) is improved.

Embodiment 3 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 8 is a diagram illustrating a configuration example of the illumination device 10 according to the present embodiment. FIG. 8A is a bottom view of the lighting device 10 according to the first embodiment shown for reference, and FIGS. 8B and 8C are bottom views of the lighting device 10 according to the present embodiment. It is.

  In the first embodiment, when a plurality of LEDs 12 are used, one light guide plate 13 is provided with the same number of openings 14 as the LEDs 12, one LED 12 is accommodated in each opening 14, and each opening is further provided. The 14 mouths were covered one by one with the light control member 15. On the other hand, in this embodiment, the same number of light guide plates 13 as the LEDs 12 are prepared in a small size, and one LED 12 is combined with each light guide plate 13. One light guide plate 13 is provided with one opening 14, and the opening 14 accommodates one LED 12 as in the first embodiment, and the mouth is covered with one light control member 15. It has been broken. One light guide plate 13, one LED 12, and one light control member 15 constitute one illumination unit 30, and a plurality of illumination units 30 are connected to constitute one illumination device 10.

  In the example of FIG. 8A, in the lighting device 10 according to Embodiment 1, ten light control members 15 (not shown, but one LED 12 is housed in each light guide plate 13. Covering only one opening 14). On the other hand, in the example of FIG. 8B, in the illumination device 10 according to the present embodiment, eight illumination units 30 are arranged in two horizontal rows. That is, one light control member 15 (not shown but covers one opening 14 in which one LED 12 is housed) is installed for each of the eight light guide plates 13. In the example of FIG. 8C, a plurality of circular illumination units 30 having a circular light guide plate 13 are arranged in the unit installation housing 31.

  Thus, in this Embodiment, the light beam, light distribution, etc. which implement | achieve the target illumination space with designability can be obtained using multiple small illumination units 30. FIG.

  As mentioned above, although embodiment of this invention was described, you may implement combining 2 or more embodiment among these. Alternatively, one of these embodiments may be partially implemented. Or you may implement combining two or more embodiment among these partially.

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 LED board, 12 LED, 13 Light-guide plate, 14 Opening part, 15 Light control member, 15a High reflection material, 16 Reflective sheet, 17 Housing | casing, 18a edge part, 18b edge part, 19 color conversion member, 20 struts, 21 reflectors, 22 openings, 23 diffusing members, 24 openings, 30 lighting units, 31 unit installation housings.

Claims (14)

A light guide plate having a front surface and a back surface, and provided with a hole having an opening in the front surface, wherein the light is incident from an inner wall surface of the hole, and the incident light is emitted from the surface;
An LED (light emitting diode) that emits light, and the LED housed in the hole of the light guide plate such that the optical axis is substantially perpendicular to the surface of the light guide plate;
A light control member that is attached to the surface of the light guide plate so as to cover the opening of the hole of the light guide plate, and that blocks at least part of light emitted from the LED in the optical axis direction of the LED ;
A color conversion member that is attached to the inner wall surface of the hole of the light guide plate and converts the color of light ; and
Lighting device and the color conversion member and the light control member is characterized Rukoto detachably attached to the light guide plate together. The lighting device according to claim 1, wherein the light control member and the color conversion member are integrally formed. The LED has a light intensity in a non-axis direction, which is a direction inclined by a predetermined angle from the optical axis, greater than a light intensity in the optical axis direction,
3. The illumination device according to claim 1, wherein the light guide plate allows light emitted from at least the LED in a non-axis direction of the LED to be incident from an inner wall surface of the hole. The light control member reflects light emitted from the LED in the optical axis direction of the LED to the inside of the hole of the light guide plate,
The light guide plate, one of the lighting apparatus 3 the light reflected by the light control member from claim 1, wherein the incident from the inner wall surface of the hole. The light control member, the apex is formed in a conical shape facing the LED side, one from the LED 4 from claim 1, characterized in that we reflect light emitted in the direction of the optical axis of the LED with conical surface Lighting equipment. The light guide plate, one of the lighting apparatus of claims 1 to 5, characterized in that also emitted from at least one end face of the light incident from the inner wall surface of the hole. The lighting device according to claim 6 , wherein a treatment for diffusing light is applied to the at least one end face of the light guide plate, or a diffusing material for diffusing the light is attached. The lighting device according to claim 6 or 7 , wherein the light guide plate is formed such that an end portion having the at least one end face is reduced in thickness as the end portion is approached. The lighting device further includes:
Wherein said at least one end face of the light guide plate and disposed at a predetermined distance, one of the lighting apparatus of claims 6, characterized in that it comprises a reflector for reflecting light emitted from the end face 8. The lighting device further includes:
Wherein the light guide plate attached to at least one end face, one of the lighting apparatus of claims 6, characterized in that it comprises the other of the color conversion member for converting the color of light 9. The lighting device further includes:
A housing for accommodating the light guide plate, wherein one surface is opened so that the front surface of the light guide plate is exposed, and opposite to the one surface so that a part of the back surface of the light guide plate is exposed. one of the lighting apparatus of claims 1 to 10, characterized in that it comprises a housing at least one through hole is provided on the surface side. The lighting device further includes:
A reflective material that is attached to the back surface of the light guide plate and reflects the light reaching the back surface of the light guide plate to the inside of the light guide plate, and a through-hole through which the light passes is provided in part. one of the lighting apparatus of claims 1 to 11, characterized in that it comprises a reflective material. The light control member are both from the LED and converts a part of the color of the light emitted in the direction of the optical axis of the LED, claim 1, characterized in that it emits light by converting the color on the outside 12 of the Lighting equipment. Any of the lighting device according to claim 1 to 13, characterized in that the lighting unit in combination with said light control member and the LED and the light guide plate one by one are more connected.