JP5300817B2 - Illumination light source and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source for illumination using an LED and a light guide body which is easy to fabricate, and is excellent in efficiency and uniformity of emission light. <P>SOLUTION: The lighting system 10 is equipped with a light source for illumination 11. The light source for illumination 11 is provided with one LED module 20 having at least one LED mounted on a substrate at each of both ends in longitudinal direction. Further, the light source for illumination 11 is provided with a light guide body 30 of long shape which is formed in plate shape and curved in longitudinal direction. The light guide body 30 has a first incident face located at one end in longitudinal direction, a second incident face located at the other end in longitudinal direction, and an emitting face extending in longitudinal direction. A treatment for diffusing light is applied in nearly uniformly in longitudinal direction inside the light guide body 30. A reflective coating is applied inside a reflecting surface 36. The light guide body 30 makes light emitted from the LED enter from the incident face. Then, the light guide body 30 diffuses inside the light having entered from the incident face and emits it from the emitting face. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to an illumination light source and an illumination device.

  Conventionally, in a display device in which light from one LED is incident on a light incident surface at one end of an arc-shaped light guide plate arranged on the back side of the dial, the incident light is formed on the back surface of the light guide plate. There is one that reflects toward the dial side by the reflection surfaces of the plurality of light reflecting grooves (see, for example, Patent Document 1).

JP 2009-258019 A

  In the conventional display device, in order to achieve uniformity in the brightness of the reflected light on each reflecting surface, the amount of reflection on each reflecting surface is changed as the light from the LED progresses so that light emission illuminance with excellent uniformity can be obtained. In addition, the shape of each light reflecting groove is changed. However, in comparison with a display device used for an instrument such as a speedometer for a vehicle, in a lighting fixture used to brighten a specific place, not only the uniformity of emitted light but also the ease of making an arc-shaped light guide plate There was a problem that efficiency was required.

  An object of the present invention is, for example, to provide an illumination light source using an LED and a light guide that is easy to make and has excellent efficiency and uniformity of emitted light.

An illumination light source according to an aspect of the present invention includes:
An LED that emits light;
It has an entrance surface at one end in the longitudinal direction and an exit surface extending in the longitudinal direction, and a process for diffusing the light is performed inside, and a process for reflecting the light is inside the end surface at the other end in the longitudinal direction. The light guide is a longitudinal light guide that is applied, and the light emitted from the LED is incident from the incident surface, and the incident light is diffused inside and emitted from the light exit surface.

  In one aspect of the present invention, an illumination light source is an LED, and a longitudinal light guide body in which a process for diffusing light is performed inside, and a process for reflecting light is performed on the inner side of the end face in the longitudinal direction. And. And this light guide body injects the light which LED emits from the incident surface in the edge on the opposite side of the said end surface, diffuses incident light inside, and radiate | emits it from the output surface extended in a longitudinal direction. Therefore, according to one aspect of the present invention, it is possible to provide an illumination light source using an LED and a light guide that has excellent uniformity of emitted light, is easy to make, and has high efficiency. .

(A) The perspective view of the illuminating device which concerns on Embodiment 1, (b) The perspective view of the illuminating device which concerns on the modification of Embodiment 1, (c) The perspective view of the illuminating device which concerns on the modification of Embodiment 1. FIG. (D) The perspective view of the illuminating device which concerns on the modification of Embodiment 1. FIG. (A) The partial cross section side view of the illuminating device which concerns on Embodiment 1, (b) The partial cross section side view of the illuminating device which concerns on the modification of Embodiment 1. FIG. FIG. 2 is a block diagram illustrating a configuration of an LED power source according to Embodiment 1. (A) The perspective view of the light source for illumination which concerns on Embodiment 1, (b) The perspective view of the light source for illumination which concerns on the modification of Embodiment 1. FIG. (A) The perspective view of the light source for illumination which concerns on the modification of Embodiment 1, (b) The perspective view of the light source for illumination which concerns on the modification of Embodiment 1. FIG. (A) A side view of an illumination light source according to a modification of the first embodiment, (b) a side view of an illumination light source according to the modification of the first embodiment, and (c) according to a modification of the first embodiment. The side view of the light source for illumination. (A) The graph which shows the relationship between the light transmittance of the light guide of the illumination light source which concerns on Embodiment 1, and the loss by reflection, (b) Light transmission of the light guide of the illumination light source which concerns on Embodiment 1 The graph which shows the relationship between a rate and the change of the intensity | strength of the diffused light by a position. (A) The perspective view of the illumination light source which concerns on the modification of Embodiment 1, (b) The perspective view of the illumination light source which concerns on the modification of Embodiment 1, (c) It concerns on the modification of Embodiment 1. The perspective view of the light source for illumination. (A) A perspective view of an illumination light source according to Embodiment 2, (b) a perspective view of an illumination light source according to a modification of Embodiment 2, and (c) an illumination light source according to a modification of Embodiment 2. FIG. (A) The perspective view of the light source for illumination which concerns on Embodiment 3, (b) The side view sectional drawing of the light source for illumination which concerns on Embodiment 4. FIG. (A) The perspective view of the light source for illumination which concerns on Embodiment 5, (b) The perspective view of the light source for illumination which concerns on the modification of Embodiment 5. FIG. FIG. 10 is a plan view sectional view of an illumination light source according to Embodiment 6. (A) Plan view sectional drawing of the light source for illumination which concerns on the modification of Embodiment 6, (b) Side view of LED of the light source for illumination which concerns on Embodiment 7, and a heat sink. FIG. 10 is a perspective view of an illumination light source according to Embodiment 8.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
Fig.1 (a) is a perspective view of the illuminating device 10 which concerns on this Embodiment. FIG. 2A is a partial cross-sectional side view of the lighting device 10.

  In FIG. 1A and FIG. 2A, the illumination device 10 includes at least one illumination light source 11 including an LED module 20 and a light guide 30. 2A shows an example in which the lighting device 10 includes a plurality of sets (specifically, two sets) of illumination light sources 11. In FIG. 1A, for simplicity, The example which the illuminating device 10 comprises only one set of the light source 11 for illumination is shown. Here, the set of illumination light sources 11 means a combination of one or a plurality of illumination light sources 11 to form a substantially circular lamp as a whole. A detailed configuration of the illumination light source 11 will be described later.

  In addition to the illumination light source 11, the illumination device 10 includes a main body 12, a holder 13, an LED power supply 14 (power supply device), a wiring 15, a drawstring 16, a reflective cover 17 (sade), and a fixture 18.

  The illumination light source 11 is detachable. When the illumination light source 11 is attached to the illumination device 10, the illumination light source 11 is fixed by a holder 13 extending downward from the main body 12. The LED power supply 14 is also detachable, and is housed inside the main body 12 when attached to the lighting device 10. The LED module 20 of the illumination light source 11 and the LED power source 14 are connected by a wiring 15. The LED power supply 14 supplies power to the LED module 20 via the wiring 15. The LED power source 14 is connected to the LED module 20 via the wiring 15 when the pull string 16 is pulled or when a predetermined signal is transmitted from a volume dial, a switch, a remote controller (wireless), or the like (not shown). Various signals such as a lighting control signal and a dimming control signal are transmitted. When the LED module 20 is turned on, the light emitted from the LED module 20 is diffused by the light guide 30 of the illumination light source 11 and emitted to the surroundings. At this time, the light emitted upward or laterally is reflected downward by the reflection cover 17 that covers the illumination light source 11 from above, so that the instrument efficiency is increased. The lighting device 10 is installed on a ceiling surface, for example, and is fixed by a fixture 18.

  Of the components constituting the illumination device 10, components other than the illumination light source 11 and the LED power source 14 may be, for example, conventional round tube fluorescent lamp components. Therefore, by attaching the illumination light source 11 and the LED power source 14 according to the present embodiment to a lighting fixture using a conventional round tube fluorescent lamp, the life of the light source can be extended and energy saving can be achieved. For example, if the outer diameter (vertical width and horizontal width in plan view) of the light source 30 of the illumination light source 11 is about 205 mm (millimeters), and the vertical and horizontal widths of the cross section are about 29 mm, the illumination light source 11 will be The 20-shaped round tube fluorescent lamp can be replaced. Similarly, if the outer diameter of the light guide 30 is about 225 mm and the vertical and horizontal widths of the cross section are about 29 mm, the conventional 30-shaped round tube fluorescent lamp can be replaced.

  Here, as a diagram corresponding to FIG. 2A, FIG. 2B shows a modification of the present embodiment. As illustrated in FIG. 2B, the lighting device 10 may include a diffusion cover 19 that diffuses light from the illumination light source 11 instead of the reflection cover 17. As described above, when the LED module 20 is turned on, the light emitted from the LED module 20 is diffused by the light guide 30 of the illumination light source 11 and emitted to the surroundings. At this time, in this example, the light emitted from the light guide 30 is further diffused by the diffusion cover 19 that covers the illumination light source 11 from below (attached to the front surface of the illumination light source 11). Unevenness can be reduced.

  FIG. 3 is a block diagram showing the configuration of the LED power supply 14.

  In FIG. 3, the LED power source 14 is connected to a commercial power source 40 by an electric wire passing through the inside of the fixture 18. Further, as described above, the LED power supply 14 is connected to the LED module 20 of the illumination light source 11 by the wiring 15.

  The LED power source 14 includes an AC-DC conversion circuit 41, a light control unit 42, and a control unit 43. Here, as will be described later, the illumination light source 11 includes two LED modules 20, and the LED power source 14 includes a dimming unit 42 for each LED module 20.

  The AC-DC conversion circuit 41 supplies light source power to the dimming unit 42 by converting an alternating current input from the commercial power supply 40 into a direct current and inputting it to the dimming unit 42. The light control unit 42 has a function of turning on / off the LED module 20. The dimming unit 42 also controls the forward current control (control to adjust the brightness of the light source by adjusting the current value) and duty control (flash the light source at high speed and turn on the LED module 20 with respect to the lighting time). For controlling the brightness of the light source by adjusting the light intensity). The control unit 43 has a function of receiving an input from the outside for adjusting the LED module 20 (in the case where there are a plurality of LED modules 20, the individual LED module 20 or the illumination light source 11) to a desired light emission intensity. ing. Further, the control unit 43 has a function of giving a signal according to the input to the dimming unit 42. As described above, as described above, the pull string 16, the volume dial, the switch, the remote controller, or the like can be used.

  FIG. 4A is a perspective view of the illumination light source 11.

  In FIG. 4A, the illumination light source 11 includes an LED module 20 having at least one LED 21 mounted on a substrate at one end in the longitudinal direction. The illumination light source 11 includes a longitudinal light guide 30 (light guide plate) that is formed in a plate shape and is curved in the longitudinal direction. Although not shown, the LED module 20 and the light guide 30 are connected by a frame material, for example. 4A shows an example in which three LEDs 21 are linearly arranged on the substrate of the LED module 20, but the number and arrangement of the LEDs 21 are not limited to this. For example, two or less or four or more LEDs 21 may be arranged in a straight line, or a plurality of LEDs 21 may be arranged in a ring shape, a radial shape, a plurality of rows of straight lines, or randomly. As shown in FIG. 1A, the entire light guide 30 is curved in a substantially arc shape, and the entire illumination light source 11 including the LED module 20 has a substantially quarter circle shape in plan view. Is formed. That is, the light guide 30 has a substantially quarter circle. Therefore, by connecting the end portions of the four illumination light sources 11 in order (it may only be fixed so as to be close to each other), a set of illumination light sources 11 is formed, and the lamp is substantially circular as a whole. It can be.

  Here, as a diagram corresponding to FIG. 1A, FIGS. 1B to 1D show modifications of the present embodiment. As shown in FIG. 1B, the light guide 30 may be formed so that the entire illumination light source 11 has a substantially semicircular shape in plan view. That is, the light guide 30 may be substantially semicircular. In this case, the end portions of the two illumination light sources 11 are connected to each other (the position may be fixed so that they are close to each other), thereby forming a set of illumination light sources 11 and a generally circular lamp as a whole. It can be. Moreover, as shown in FIG.1 (c), the light guide 30 may be formed so that the illumination light source 11 whole may become a substantially circular shape by planar view. That is, the light guide 30 may be substantially circular. In this case, a set of illumination light sources 11 can be formed by only one illumination light source 11, and a substantially circular lamp can be formed as a whole. Moreover, as shown in FIG.1 (d), the light guide 30 may be formed so that it may become a substantially 1/3 circular shape. In this case, by connecting the end portions of the three illumination light sources 11 in order (it is also possible to fix the positions so as to be close to each other), a set of illumination light sources 11 is formed, and the overall shape is substantially circular. It can be a lamp.

  In addition, the shape of the light guide 30 is not limited to the entire shape curved in a substantially arc shape, and may be, for example, a substantially S shape or a substantially U shape in plan view. Further, as described below, the shape of the light guide 30 may not be curved, and the cross section of the light guide 30 may have a shape other than a rectangular shape.

  Here, as a diagram corresponding to FIG. 4A, FIGS. 4B, 5 </ b> A, and 5 </ b> B show modifications of the present embodiment. As shown in FIG. 4B, the shape of the light guide 30 may be a substantially rectangular shape (prism shape) in plan view. Moreover, as shown to Fig.5 (a), the shape of the light guide 30 may be cylindrical. That is, the cross section of the light guide 30 may be circular. Moreover, as shown in FIG.5 (b), the shape of the light guide 30 may be cylindrical. That is, the cross section of the light guide 30 may be ring-shaped. Although not shown, the shape of the light guide 30 may be a polygonal column shape, a bowl shape, or the like, and the cross section of the light guide 30 has an elliptical shape, a semicircular shape, a dome shape, a trapezoidal shape, a horseshoe shape, or the like. It may be a shape or the like.

  In FIG. 4A, the LED 21 emits light from the surface (light emitting surface). The light guide 30 includes an incident surface 31 (one end surface in the longitudinal direction) at one end in the longitudinal direction, a reflecting surface 36 (the other end surface in the longitudinal direction) at the other end in the longitudinal direction, and an emission extending in the longitudinal direction. And a surface 32 (for example, a bottom surface, a side surface, and an upper surface). The light guide 30 is subjected to a process of diffusing light. A reflective coating is applied to the inside of the reflective surface 36 as a process for reflecting light. The light guide 30 enters the light emitted from the LED 21 from the incident surface 31. The light guide 30 diffuses the light incident from the incident surface 31 and emits the light from the output surface 32. At this time, a part of the light incident from the incident surface 31 reaches the reflecting surface 36 without being emitted from the emitting surface 32, but such light is reflected on the inner side of the light guide 30 by the reflecting surface 36, The light is diffused and emitted from the emission surface 32.

  In addition to the method of applying a reflective coating to the reflective surface 36, the reflective surface 36 may be coated with white paint as shown in FIG. A method of covering the reflecting surface 36 with a white plate as in the example of FIG. 5A or covering the reflecting surface 36 with a reflecting mirror (reflecting plate) as in the example of FIG. 5B can be used.

  Here, FIGS. 6A and 6B show a modification of the present embodiment. As shown in FIGS. 6A and 6B (both are side views of the illumination light source 11), a diffusion pattern 33 for diffusing light incident from the incident surface 31 is formed on the output surface 32 of the light guide 30. It may be formed. Thereby, the emission efficiency of the emitted light is improved. In the example of FIG. 6A, the exit surface 32 of the light guide 30 is subjected to uneven processing as the diffusion pattern 33 (specifically, many grooves having a substantially V-shaped cross section are formed. Other groove shapes may be used). On the other hand, in the example of FIG. 6B, dot printing is performed as the diffusion pattern 33 on the emission surface 32 of the light guide 30.

  In FIG. 4A, the light guide 30 is preferably made of a light-transmitting plastic material (transparent resin), but may be made of a glass material. In the case of using a plastic material, it becomes easy to perform a bending process or a process of diffusing light. As the plastic material, for example, a semi-transparent partially crystalline plastic or a semi-transparent polymer alloy is used, and the light guide 30 is configured to diffuse light substantially uniformly in the longitudinal direction within the light guide 30 (specifically In terms of production, it is desirable that the degree of crystallinity and the alloy structure (alloy blending amount) are substantially uniform). That is, the light diffusing process may be substantially uniform in the longitudinal direction inside the light guide 30.

  Partially crystalline plastics are translucent because refraction occurs at the crystalline / amorphous interface in the plastic. In order to increase the transmittance, the crystallinity should be decreased. As the partially crystalline plastic, for example, polyethylene resin, polypropylene resin, and polyacetal resin can be used.

  Plastic materials include polycarbonate (PC) resin, polyarylate (PAR) resin, polysulfone (PSF) resin, polyetherimide (PEI) resin, polyphenylene sulfide (PPS) resin, acrylic (PMMA) resin, acrylonitrile and styrene. Polymer (AS) resin, vinyl chloride (PVC) resin, polystyrene (PS) resin, polyethylene terephthalate (PET) resin, polymethylpentene (PMP) resin, or a combination of these is used. You can also.

  Here, FIG. 6C shows a modification of the present embodiment. As shown in FIG. 6C (side view of the illumination light source 11), the light guide 30 is formed by dispersing fine particles 34 having a refractive index different from that of the plastic material in the plastic material as described above. It may be a thing. In this case, it is possible to diffuse light on the surface of the fine particles 34 using the difference in refractive index. It is desirable for manufacturing that the fine particles 34 are dispersed substantially uniformly inside the light guide 30. That is, as described above, the light diffusing process may be substantially uniform in the longitudinal direction inside the light guide 30. As the fine particles 34, for example, a transparent glass material can be used.

  Although not shown, the light guide 30 may be formed by dispersing white ceramic powder in the plastic material as described above. In this case, light can be diffused by collision between the powder and light (because the powder is white, light absorption is small). It is desirable for manufacturing that the ceramic powder is dispersed substantially uniformly inside the light guide 30. That is, as described above, the light diffusing process may be substantially uniform in the longitudinal direction inside the light guide 30. As the ceramic powder, for example, metal oxides such as silica, alumina, magnesia, titania, calcia, ceria, yttria, zirconia, calcium carbonate, magnesium carbonate, barium sulfate, aluminum hydroxide, and the like can be used.

  In addition, polycarbonate (PC) resin, polyarylate (PAR) resin, polysulfone (PSF) resin, polyetherimide (PEI) resin, polyphenylene sulfide are used as transparent plastic materials for dispersing fine particles of different refractive index and white ceramic powder. (PPS) resin, acrylic (PMMA) resin, acrylonitrile / styrene copolymer (AS) resin, vinyl chloride (PVC) resin, polystyrene (PS) resin, polyethylene terephthalate (PET) resin, polymethylpentene (PMP) resin Either can be used.

  When the longitudinal light guide 30 curved in the longitudinal direction is obtained by bending the plastic material, for example, the light guide 30 shown in FIG. It is possible to obtain the light guide 30 shown in FIG. That is, the substantially rectangular light guide 30 in a plan view in which a process for diffusing light is performed is curved in the longitudinal direction to obtain a substantially arc-shaped light guide 30 in a plan view. Can do. At this time, if the process of diffusing light is performed substantially uniformly inside the light guide 30 before being bent (the light guide 30 having a substantially rectangular shape in plan view), Inside the light guide 30 (the substantially arc-shaped light guide 30 in plan view), the process of diffusing light is performed so as to become dense from the outside in the bending direction of the light guide 30 toward the inside. It becomes a state. That is, the diffusion process becomes dense on the inner peripheral side of the light guide 30 bent at an arbitrary curvature and rough on the outer peripheral side. Thereby, the difference in luminance caused by the relative position of the light guide 30 in the bending direction can be reduced on the entire emission surface 32. Accordingly, it is sufficient that the light guide plate before processing is subjected to a substantially uniform diffusion treatment, and the manufacture becomes easy.

  FIG. 7A is a graph showing the relationship between the light transmittance of the light guide 30 and the loss due to reflection. FIG. 7B is a graph showing the relationship between the light transmittance of the light guide 30 and the change in the intensity of the diffused light depending on the position. These graphs are obtained by using a light guide 30 in which glass fine particles are uniformly dispersed in an acrylic resin as in the example of FIG. 6C.

  7A and 7B, the light transmittance of the light guide 30 refers to the transmittance at which light incident from the incident surface 31 of the light guide 30 reaches the reflecting surface 36 of the light guide 30. . The light transmittance of the light guide 30 can be changed by adjusting the amount of dispersion of the glass fine particles. Further, the loss due to reflection refers to a light loss rate due to the light incident from the incident surface 31 of the light guide 30 being reflected by the reflection surface 36 of the light guide 30.

  As shown to Fig.7 (a), if the light transmittance of the light guide 30 is 50% or less, since the loss by reflection will be suppressed to 10% or less, high luminous efficiency (equipment efficiency) will be obtained. On the other hand, if the light transmittance of the light guide 30 exceeds 70%, the number of reflections between the end faces of the light incident on the light guide 30 increases, and the loss due to reflection at the end faces exceeds 20%. High luminous efficiency is difficult to obtain. As shown in FIG. 7B, if the light transmittance of the light guide 30 is 25% or more, the light guide 30 is also incident on the reflection surface 36 (reflection processing side end surface) of the light guide 30. Since approximately 50% of the light on the surface 31 (the end surface on the LED 21 side) can be secured, substantially uniform emitted light can be obtained. That is, it is desirable to adjust the diffusion process of the light guide 30 so that 25 to 70% of the light incident from one end face reaches the other end face.

  As described above, since the present embodiment also emphasizes ease of production, “almost uniform light diffusion processing may be used, but the transmittance is limited to a certain range in consideration of uniformity and efficiency”. The point found is significant. For example, a partially crystallized plastic or a polymer alloy has a substantially uniform crystallinity and an alloy structure in a normal way. It is also easy to disperse the fine particles and ceramic powder substantially uniformly in a transparent plastic. Conversely, in order to increase the light uniformity in the longitudinal direction of the light guide plate, for example, it is desirable in principle to change the crystallinity, the alloy blending amount, and the fine particle dispersion amount as the distance from the light source increases. Considering the manufacturing method, it is very difficult to make. On the other hand, in the present embodiment, for example, partial crystal plastics and polymer alloys may be manufactured by a normal manufacturing method, and therefore, an illumination light source 11 that is easy to manufacture and has excellent efficiency and uniformity of emitted light is provided. Is possible.

  In the present embodiment, when a plurality of LEDs 21 are mounted on the substrate of the LED module 20, as described above, the LEDs 21 may be arranged linearly in one or a plurality of rows, or in a ring shape, a radial shape, Or you may arrange | position at random. For example, you may arrange | position LED21 so that it may become dense toward the inner side from the outer side of the bending direction of the light guide 30. FIG. In this case, the difference in luminance caused by the relative position of the light guide 30 in the bending direction can be reduced on the entire emission surface 32 of the light guide 30. Even when the LEDs 21 are arranged uniformly (at equal intervals), the LEDs 21 are dimmed so that the luminous flux decreases from the outside in the bending direction of the light guide 30 toward the inside. The same effect can be obtained.

  Moreover, in this Embodiment, when several LED21 is mounted on the board | substrate of the LED module 20, what emits the light of the same color temperature to all LED21 may be used, and it mutually differs as follows A combination of at least two types of LEDs 21 that emit light of color temperature may be used.

  Here, FIGS. 8A to 8C show a modification of the present embodiment. As shown in FIG. 8A (a perspective view of the illumination light source 11), as two types of LEDs 21, an LED 21 having a color temperature of 3000K (Kelvin) and an LED 21a having a color temperature of 6000K can be combined. At this time, in addition to the functions described above, the control unit 43 of the LED power supply 14 supplies the LED module 20 (in the case where there are a plurality of LED modules 20, the individual LED module 20 or the illumination light source 11) to a desired color temperature. It has a function of accepting an input for adjusting from the outside. And the control part 43 has a function which gives the signal according to the input to the light control part 42. FIG. It is desirable that the dimming unit 42 of the LED power supply 14 is configured to dimm the LED 21 and the LED 21a independently. Thereby, the color temperature of the illumination light source 11 as a whole can be made variable between 3000 and 6000K. Moreover, the color mixing property of light can be improved by arrange | positioning LED21 and LED21a alternately one each or plurality by one (namely, arrange | positioning periodically changing). Further, as shown in FIG. 8B (a perspective view of the light source 11 for illumination), the LEDs 21 and the LEDs 21a may be arranged in a plurality of lines so as not to be adjacent to each other with the same color temperature. Thereby, the color mixing property of light can further be improved. Further, as shown in FIG. 8C (a perspective view of the illumination light source 11), for example, the LEDs 21 and the LEDs 21a may be arranged radially so that one surrounds the other. Thereby, the color mixing property of light can further be improved. In this example, since the columnar (or cylindrical) light guide 30 is used, by arranging the LEDs 21 and 21a radially, an effect of increasing the uniformity of light emission in the circumferential direction can be obtained.

  As shown in FIG. 1 (a) or (b), when connecting a plurality of illumination light sources 11 or fixing their positions so as to be close to each other, all illumination light sources 11 have the same color temperature. Those that emit light may be used, or at least two types of illumination light sources 11 that emit light having different color temperatures may be used in combination. For example, as the two types of illumination light sources 11, the illumination light source 11 including the LED module 20 having a color temperature of 3000K and the illumination light source 11 including the LED module 20 having a color temperature of 6000K can be combined. In this case, it is possible to provide the lighting device 10 with excellent design by arranging two or more types of illumination light sources 11 one by one or plural alternately, or by arranging the same ones on a diagonal line. Can do.

  As described above, in the present embodiment, a process in which light is diffused substantially uniformly in the longitudinal direction is performed, and a reflection process is performed on one end surface in the longitudinal direction. The light guide 30 enters the light from the LED 21 on the other end face in the longitudinal direction, and the incident light is diffused and emitted from the surface of the light guide 30 except the end face. The light guide 30 can be easily processed by performing the diffusion process substantially uniformly, and the light can be emitted substantially uniformly from the surface of the light guide 30 by performing the reflection process on one end face. That is, it is possible to provide the illumination light source 11 having excellent uniformity of the emitted light. Further, the emission efficiency can be improved by performing diffusion treatment on the surface of the light guide 30. This effect can be obtained even when the light guide 30 is not arcuate in plan view but rectangular in plan view.

  In addition, according to the present embodiment, an annular or curved light emitting surface (exit surface 32) is formed by one or a plurality of illumination light sources 11, and a luminaire without glare (glare) is provided. it can. This not only provides a circular illumination device that takes advantage of the long life and high efficiency of the LED 21, but also replaces the round fluorescent tube used in the circular illumination device with the illumination light source 11 according to the present embodiment (replacement). ) Is possible. Moreover, according to this Embodiment, since it is not necessary to form the board | substrate which arrange | positions LED21 cyclically | annularly, or arrange | positions LED21 cyclically | annularly, the lighting fixture which is easy to manufacture can be provided.

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

  FIG. 9A is a perspective view of the illumination light source 11 according to the present embodiment.

  In FIG. 9A, the illumination light source 11 is formed in a substantially quarter circle shape as in the case shown in FIG. 1A and FIG. 4A. A diffusion pattern 33 for diffusing the light incident from the incident surface 31 is formed on the exit surface 32 of the light guide 30 of the illumination light source 11 so as to become dense from the side closer to the LED module 20 toward the far side. Has been. That is, the diffusion pattern 33 becomes denser as it moves away from the LED 21 at one end in the longitudinal direction of the light guide 30 and becomes rougher as it approaches the LED 21 (from one end of the light guide 30 in the longitudinal direction to the other end). It is desirable that the density of the diffusion pattern 33 changes smoothly in the direction). Thereby, the difference in brightness caused by the distance from the LED module 20 in the entire emission surface 32 can be reduced. The diffusion pattern 33 is formed on all surfaces other than the end face of the light guide 30. However, when the side surface and the bottom surface are subjected to the reflection treatment, the diffusion pattern 33 is applied only to the emission surface 32 (not subjected to the reflection treatment). Good. As the diffusion pattern 33, as shown in the example of FIG. 6A described above, uneven processing is performed (for example, a groove having a substantially V-shaped cross section is formed so that the distance between the LEDs becomes narrower as the distance from the LED 21 increases. ) Or dot printing is performed like the example of FIG.6 (b) mentioned above (for example, it prints so that a mutual space | interval may become narrow as a dot leaves | separates from LED21). If the light guide 30 has a longitudinal shape, the same effect can be obtained by adopting the same configuration. Therefore, the illumination light source 11 is shown in FIG. 1B or FIG. 1C, for example. Such a shape may be used, and other shapes may be used as described below.

  Here, as a diagram corresponding to FIG. 9A, FIGS. 9B and 9C show a modification of the present embodiment. As shown in FIG. 9B, the shape of the light guide 30 may be a substantially rectangular shape (prism shape) in plan view. Moreover, as shown in FIG.9 (c), the shape of the light guide 30 may be cylindrical. That is, the cross section of the light guide 30 may be circular. Although not shown, the shape of the light guide 30 may be a cylindrical shape, a polygonal column shape, a bowl shape, or the like, and the cross section of the light guide 30 may be a ring shape, an elliptical shape, a semicircular shape, or a dome. It may be a shape, a trapezoidal shape, a horseshoe shape, or the like.

  When a longitudinal light guide 30 curved in the longitudinal direction is obtained by bending a plastic material, for example, the light guide 30 shown in FIG. 9B may be used as the material before processing. it can. That is, the light guide 30 having a substantially rectangular shape in a plan view in which a process for diffusing light is performed inside and the diffusion pattern 33 is formed on the surface is curved in the longitudinal direction, for example, in a plan view. The arcuate light guide 30 can be easily obtained. At this time, if the process of diffusing light is performed substantially uniformly inside the light guide 30 before being bent (the light guide 30 having a substantially rectangular shape in plan view), Inside the light guide 30 (the substantially arc-shaped light guide 30 in plan view), the process of diffusing light is performed so as to become dense from the outside in the bending direction of the light guide 30 toward the inside. It becomes a state. That is, the diffusion process becomes dense on the inner peripheral side of the light guide 30 bent at an arbitrary curvature and rough on the outer peripheral side. Thereby, the difference in luminance caused by the relative position of the light guide 30 in the bending direction can be reduced on the entire emission surface 32. Moreover, if the diffusion pattern 33 is substantially uniformly formed on the surface of the light guide 30 before being bent (the light guide 30 having a substantially rectangular shape in plan view), the light guide after being bent On the surface of the light guide 30 (substantially arcuate light guide 30 in plan view), the diffusion pattern 33 is formed so as to become dense from the outside in the bending direction of the light guide 30 toward the inside. That is, the diffusion pattern 33 becomes dense on the inner peripheral side of the light guide 30 bent at an arbitrary curvature, and becomes rough on the outer peripheral side. Thereby, the difference in luminance caused by the relative position of the light guide 30 in the bending direction can be further reduced on the entire emission surface 32.

  As described above, in the present embodiment, a process in which light is diffused substantially uniformly in the longitudinal direction is applied to the inside, a reflection process is applied to one end surface in the longitudinal direction, and the side closer to the light source The light guide 30 having a substantially arc shape in a plan view in which the diffusion pattern 33 is formed on the surface so as to become dense toward the side far from the light enters the other end face in the longitudinal direction, and enters the light from the LED 21. The emitted light is diffused and emitted from the surface of the light guide 30 except for the end face. By forming the diffusion pattern 33 so as to be dense toward the side far from the light source, more uniform light emission in the longitudinal direction of the light guide 30 is possible. This effect can be obtained even when the light guide 30 is not arcuate in plan view but rectangular in plan view.

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

  FIG. 10A is a perspective view of the illumination light source 11 according to the present embodiment.

  In FIG. 10A, only a certain region located in the optical axis direction of the LED 21 among the end surfaces at one end of the light guide 30 is an incident surface 31 (an incident window through which light from the LED 21 is incident). The region other than the incident surface 31 is a reflecting surface 36. In the present embodiment, the shape of the incident surface 31 is rectangular, but it may be circular or other shapes. Moreover, in this Embodiment, although the entrance plane 31 is provided for every LED21 in the end of the light guide 30, with respect to a part (two or more) or all of LED21 in the end of the light guide 30 One may be provided. Similar to the reflective surface 36 at the end opposite to the incident surface 31, light is guided to the reflective surface 36 at the end on the same side as the incident surface 31 (that is, around the incident surface 31). The process which reflects inside is performed. Thereby, since the amount of light leaking from the end face at one end of the light guide 30 can be minimized, higher luminous efficiency can be obtained. As the treatment for reflecting light inward, for example, white coating, white plate pasting, and metal coating can be performed.

Embodiment 4 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 10B is a side sectional view of the illumination light source 11 according to this embodiment.

  In FIG. 10B, the illumination light source 11 is provided with a sleeve 37 that fixes the substrate of the LED module 20 at one end of the light guide 30 to one end in the longitudinal direction of the light guide 30. The sleeve 37 surrounds a gap between the substrate and one end of the light guide 30 in the longitudinal direction. For this reason, light leakage can be prevented. Moreover, since the portion of the light guide 30 that is closest to the light source is covered with the sleeve 37, light is not emitted from the portion, dazzling is reduced, and the uniformity of the entire emitted light is improved. .

  For example, white coating 38 is applied to the inner peripheral surface of the sleeve 37 as a process of reflecting light. In addition, for example, white coating 38 is applied to the surface of the substrate of the LED module 20 as a similar process. Thereby, since almost all of the light emitted from the LED 21 at one end of the light guide 30 can be made incident on the incident surface 31 of the light guide 30, high luminous efficiency can be obtained.

  As described above, in the present embodiment, the substrate on which the LED 21 is mounted is disposed on the end surface of the light guide 30 via the sleeve 37, and the substrate surface and the inside of the sleeve 37 are subjected to reflection treatment. Therefore, since the light emitted from the end face can be reflected and returned to the light guide 30, high luminous efficiency can be obtained.

Embodiment 5 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 11A is a perspective view of the illumination light source 11 according to the present embodiment.

  In FIG. 11A, only a part of the surface extending in the longitudinal direction of the light guide 30 is the emission surface 32, and the region other than the emission surface 32 transmits light to the inside of the light guide 30. It is covered with a reflector 35 (reflecting plate) that reflects on the surface. For example, if it is not necessary to emit light from the upper surface of the light guide 30 (or a surface or region that is blocked by the main body 12 even if light is emitted), the other surfaces, that is, the side surfaces of the light guide 30 and By setting only the bottom surface as the emission surface 32 and covering the entire top surface of the light guide 30 with the reflector 35, it is possible to reflect light in an unnecessary direction and increase the illuminance of light in the necessary direction. In addition, you may give reflective coatings, such as aluminum, as the reflector 35 in the surface which does not require the emission of light.

  Here, as a diagram corresponding to FIG. 11A, FIG. 11B shows a modification of the present embodiment. As shown in FIG. 11B, the shape of the light guide 30 is cylindrical, and the upper half of the light guide 30 (or the surface or region that is blocked by the main body 12 even when light is emitted) is reflected by the reflector 35. It may be covered with. Although not shown, the shape of the light guide 30 is cylindrical, and the upper half of the light guide 30 (or the surface or region that is blocked by the main body 12 even when light is emitted) is covered with the reflector 35. May be.

Embodiment 6 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 12 is a bottom view of the illumination light source 11 according to the present embodiment.

  In FIG. 12, the substrate of the LED module 20 is a double-sided mounting substrate, and the LEDs 21 of one illumination light source 11 are mounted on the surface of one substrate, and the LEDs 21 of the other illumination light sources 11 are mounted on the back surface of the same substrate. Has been implemented. In the present embodiment, as in the example of FIG. 1B, the illumination device 10 includes two illumination light sources 11, and these illumination light sources 11 constitute a substantially circular lamp as a whole. The two light sources 11 for illumination are connected so that the edge part by which the LED module 20 is arrange | positioned adjoins (it may just fix a position so that it may adjoin). In this manner, by mounting the LEDs 21 on both sides of the substrate on which circuits can be formed on both sides, the size of the LED module 20 can be reduced, and the size of the light guide 30 can be increased accordingly. Note that the double-sided mounting board may be provided with some heat radiation means, such as a metal plate for heat radiation sandwiched in the center.

  In the present embodiment, a sleeve 37 similar to that of the fourth embodiment is further installed between the ends of the light guide 30 of the adjacent illumination light source 11 on the side where the LED module 20 is present. The sleeve 37 is attached to the end of one light guide 30 and the end of another light guide 30 so as to connect the adjacent ends of the two light guides 30. The sleeve 37 surrounds the gap formed between the adjacent end portions of the two light guides 30 together with the LED modules 20 installed in the gap. For this reason, the leakage of the light in the connection part of the light source 11 for illumination can be prevented. Moreover, the edge parts of the side where the LED module 20 of the light guide 30 of the adjacent illumination light source 11 is not connected are connected via a reflector 35 (for example, a reflector). The reflector 35 forms the reflecting surface 36 of both the light guides 30. Thus, since the side without the LED module 20 can connect the two light guides 30 only with the reflector 35, the size of the light guide 30 can be increased accordingly.

  FIG. 13A shows a modification of the present embodiment. As shown in FIG. 13A (plan view sectional view of the illumination light source 11), the shape of the light guide 30 may be substantially rectangular in plan view, and includes such a light guide 30. The illumination light source 11 may be provided with a sleeve 37 similar to that of the fourth embodiment. In this example, the illumination device 10 includes two illumination light sources 11, and these illumination light sources 11 are arranged in series. Then, one LED module 20 and one sleeve 37 are installed between the ends of the light guide 30 of the adjacent illumination light source 11 (only at one location). The sleeve 37 is attached to the end of one light guide 30 and the end of another light guide 30 so as to connect the adjacent ends of the two light guides 30. The sleeve 37 surrounds a gap formed between adjacent end portions of the two light guides 30 together with the LED modules 20 installed in the gap. For this reason, the leakage of the light in the connection part of the light source 11 for illumination can be prevented. On the other hand, at the opposite ends of the two light guides 30, a reflective surface 36 is formed which is provided with a reflective coating (or white paint or the like) (or covered with a white plate or a reflective mirror).

Embodiment 7 FIG.
In the present embodiment, differences from the sixth embodiment will be mainly described.

  FIG. 13B is a side view of the LED 21 and the heat sink 50 of the illumination light source 11 according to the present embodiment.

  In FIG.13 (b), the board | substrate of the LED module 20 is not a double-sided mounting board but a single-sided mounting board. A heat sink 50 is attached between the LED module 20 of one illumination light source 11 and the LED module 20 of another illumination light source 11. The heat sink 50 includes two stages 51 and radiating fins 52 between the stages 51. On the substrate of one LED module 20, the LED 21 (first LED) is mounted on the front surface, and one stage 51 of the heat sink 50 is in contact with the back surface. The substrate of the other LED module 20 has the LED 21 (second LED) mounted on the front surface, and the other stage 51 of the heat sink 50 is in contact with the rear surface. As described above, in the present embodiment, the two stages 51 arranged in parallel are each mounted with the substrate of one LED module 20 and are coupled by the common heat radiation fins 52. Therefore, it becomes possible to mount the LED 21 with higher output.

Embodiment 8 FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 14 is a perspective view of the illumination light source 11 according to the present embodiment.

  In FIG. 14, the illumination light source 11 includes a milky white sheet 39 that covers the light guide 30 and diffuses light. For this reason, diffusion of light is promoted, and illumination with higher uniformity can be obtained. In addition, the same effect is acquired also when the milky white coating which diffuses light is given to the surface of the light guide 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 Illumination device, 11 Illumination light source, 12 Main body, 13 Holder, 14 LED power supply, 15 Wiring, 16 Drawstring, 17 Reflection cover, 18 Fixing tool, 19 Diffusion cover, 20 LED module, 21, 21a LED, 30 Light guide Body, 31 entrance surface, 32 exit surface, 33 diffusion pattern, 34 fine particles, 35 reflector, 36 reflection surface, 37 sleeve, 38 white coating, 39 sheet, 40 commercial power supply, 41 AC-DC conversion circuit, 42 dimmer , 43 control unit, 50 heat sink, 51 stage, 52 radiation fin.

Claims (23)

An LED that emits light;
It has an entrance surface at one end in the longitudinal direction and an exit surface extending in the longitudinal direction, and the process of diffusing light is performed substantially uniformly in the longitudinal direction, and the process of reflecting the light inward is performed in the longitudinal direction. Is a longitudinal light guide that is applied to the end surface at the other end of the light source, is curved in the longitudinal direction, and is formed in a substantially arc shape in plan view, and the light emitted from the LED is incident from the incident surface, A light guide that diffuses incident light inside and emits it from the exit surface;
A board on which the LED is mounted,
The LEDs are arranged on the substrate from the outside in the bending direction of the light guide to the inside, and are dimmed so that the light flux decreases from the outside to the inside in the bending direction of the light guide. An illumination light source comprising a plurality of LEDs. 2. The illumination light source according to claim 1 , wherein the illumination light source is formed in any one of a substantially circular shape, a substantially semicircular shape, a substantially semicircular shape, and a substantially 1/3 circular shape in plan view. 3. The illumination according to claim 1, wherein a diffusion pattern for diffusing light is formed on the exit surface of the light guide so as to become dense from a side closer to the LED toward a side farther from the LED. Light source. The light source for illumination according to claim 3 , wherein unevenness processing or dot printing is performed on the exit surface of the light guide as the diffusion pattern. The exit surface of the light guide is a part of the surface extending in the longitudinal direction of the light guide,
The illumination light source further includes:
Wherein among surfaces which extend in the longitudinal direction of the light guide covers the region other than the exit surface, the light from claim 1, characterized in that it comprises a reflector for reflecting the inside of the light guide 4 Either illumination light source. The incident surface of the light guide is a certain region located in the optical axis direction of the LED among the end surfaces at one end of the light guide,
The light guide, the process for reflecting light inwardly, out of the end face at the one longitudinal end, any one of claims 1 to 5, characterized in that it applied to a region other than the incident surface Light source for illumination. In the light guide, as a process of reflecting light inward, any one of white coating, white plate pasting, and metal coating is applied to a region other than the incident surface among the end surfaces at one end in the longitudinal direction. The illumination light source according to claim 6 . The lightguide lighting of any one of claims 1 to light incident transmittance to reach the end surfaces in the longitudinal direction of the other end, characterized in that 25 to 70% 7 from the incident surface light source. The light guide body, either illumination light source of claims 1 to 8, characterized in that it consists of a plastic material having a light-transmitting property. The illumination light source according to claim 9 , wherein the plastic material is partially crystalline plastic. 11. The illumination light source according to claim 10 , wherein the partial crystal plastic is one of polyethylene resin, polypropylene resin, and polyacetal resin. The illumination light source according to claim 9 , wherein the plastic material is a polymer alloy. The polymer alloys include butadiene / styrene copolymer (BS) resin, acrylonitrile / butadiene / styrene copolymer (ABS) resin, polycarbonate (PC) / polyester alloy resin, polycarbonate (PC) / polyethylene terephthalate (PET) / polyethylene. The light source for illumination according to claim 12 , which is any one of butylene terephthalate (PBT) alloy resins. The lightguide plastic material having a light-transmitting property, wherein one illumination light source of claims 1 to 8, characterized in that formed by dispersing fine particles of different refractive index than the plastic material. 15. The illumination light source according to claim 14 , wherein the fine particles are made of a transparent glass material. The lightguide plastic material having a light-one illumination light source of claims 1 to 8, characterized in that formed by dispersing a white ceramic powder. The plastic material is polycarbonate (PC) resin, polyarylate (PAR) resin, polysulfone (PSF) resin, polyetherimide (PEI) resin, polyphenylene sulfide (PPS) resin, acrylic (PMMA) resin, acrylonitrile / styrene copolymer coalescence (aS) resin, vinyl chloride (PVC) resin, polystyrene (PS) resin, polyethylene terephthalate (PET) resin, claim 14, characterized in that either at least a polymethylpentene (PMP) resin 16 Either illumination light source. The light guide body, polygonal, cylindrical, cylindrical, or illumination light source of claims 1 to 17, characterized in that it is formed in one semi-cylindrical in. The illumination light source further includes:
The light guide covers the body, either illumination light source of claims 1 to 18, characterized in that it comprises a milky sheet for diffusing light. The light source for illumination according to any one of claims 1 to 19 , wherein a milky white coating for diffusing light is applied to an exit surface of the light guide. Lighting apparatus characterized by comprising a one illumination light source of claim 1 20, and a power supply device for lighting the LED of the illumination light source. An LED that emits light;
It has an entrance surface at one end in the longitudinal direction and an exit surface extending in the longitudinal direction, and the process of diffusing light is performed substantially uniformly in the longitudinal direction, and the process of reflecting the light inward is performed in the longitudinal direction. A light guide which is formed on the end surface of the other end of the light guide, and which emits light emitted from the LED from the incident surface, diffuses the incident light inside, and exits from the output surface. A plurality of illumination light sources including a light body,
Comprising a heat sink attached between one illumination light source and another illumination light source;
The LED of the one illumination light source is mounted on the surface of one substrate, and the LED of the other illumination light source is mounted on the surface of the other substrate,
The lighting device, wherein the heat sink is in contact with a back surface of the one substrate and a back surface of the other substrate. The lighting device according to claim 21 or 22 , further comprising a diffusion cover that diffuses light from the illumination light source.

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