JP2012033283A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system with a high light utilization efficiency and capable of obtaining an illuminance distribution of high balance even in a wide irradiation surface.SOLUTION: The lighting system (100) is provided with an LED (10) installed on a support body (20) and a light reflector (30) having a reflecting mirror part (35) which is installed on the support body (20) and extends so as to cover from the rear side of the LED (10) to the right above the LED (10). The reflector mirror part (35) consists of a plurality of piece mirrors (36) arranged in parallel from the rear side of the LED (10) to the right above the LED (10). The piece mirrors (36) have reflecting surfaces (37) which have a larger area, a longer focal distance, and are inclined further, the closer they are arranged to the right above the LED (10), and the reflecting surface (37) of each piece mirror (36) is curved in a cross-section nearly parallel to the upper face of the support body (20).

Description

  The present invention relates to a lighting device, and more particularly to an LED lighting device including a light reflector.

  2. Description of the Related Art In recent years, light emitting diodes (LEDs) have attracted attention as illumination light sources that can be substituted for fluorescent lamps and incandescent bulbs, and are used in many lighting devices. In particular, since LEDs have low power consumption and long life, they can be used in lighting devices installed in places that are difficult to replace, such as high places. Is not so close, so it is also suitable for a lighting device installed outdoors. In such an LED lighting device, in order to uniformly illuminate a wide range, an optical system such as a lens or a reflector is provided to reflect, collect or diffuse light emitted from the LED, or the LED can be changed depending on the light emitting direction. The light distribution is controlled by changing the arrangement and number of mounted units.

  For example, in Patent Document 1, a pair of attachment portions whose backs face each other are connected by a ridge portion and formed in a V-shaped cross section, and the ridge portion is directed downward and supported by the instrument body, and a bowl shape And a plurality of LEDs arranged substantially linearly in the direction in which the reflecting member extends inside the reflecting surface and in the center in the width direction. And a plurality of light source modules arranged side by side in the longitudinal direction of the mounting plate. And it is described that according to such an illuminating device, the arrangement | sequence of LED can be simplified, a wide range illumination is possible, and a glare can be reduced.

JP 2009-152170 A JP 2009-094026 A

  However, in the illuminating device described in Patent Document 1, light emitted in the optical axis direction (directly upward direction) of the LED is directly used, and light radiated laterally from the LED is reflected on the bowl-shaped reflection surface. Since the light is reflected in the direction of the optical axis and does not have a condensing function in the extending direction of the reflecting member, the light distribution of the LED cannot be corrected sufficiently, and the illumination intensity distribution with high uniformity on the irradiation surface is It is difficult to obtain. In addition, the irradiation range becomes wider as it is farther from directly below the apparatus, and the use efficiency of light is reduced on an irradiation surface having a uniform width such as a road, and there is a risk of causing light damage to nearby private houses and fields.

  Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide an illuminating device that has a high light use efficiency and can obtain an illuminance distribution with a high degree of uniformity over a wide irradiation surface. To do.

  In order to solve the above-described problems, an illumination device according to the present invention includes an LED provided on a support, and is provided on the support, and extends from behind the LED so as to cover the LED. A light reflector having a reflecting mirror portion, and the reflecting mirror portion is composed of a plurality of small piece mirrors arranged from the rear of the LED toward directly above the LED, and the small piece mirror is directly above the LED. The closer the lens is, the larger the area, the longer the focal length, the more inclined the reflecting surface toward the support, and the reflecting surface of each small mirror is substantially parallel to the upper surface of the support. The cross section is curved.

  According to the configuration of the light reflector unique to the present invention, by appropriately correcting the light distribution of the LED, it is possible to efficiently use the light emitted from the LED and obtain an illuminance distribution with high uniformity over a wide range. it can.

It is the schematic perspective view (a) which decomposes | disassembles the illuminating device which concerns on one embodiment of this invention, and shows each structure, and the schematic perspective view (b) which expands and shows the one part A. It is the schematic perspective view (a) of the light reflector of the illuminating device which concerns on one embodiment of this invention, a schematic front view (b), and the schematic sectional drawing (c) which shows the BB cross section. It is the schematic (a) which shows an example of the light distribution of LED, and schematic sectional drawing (b) and (c) which show conceptually the irradiation of the light by the light reflector of the illuminating device which concerns on one embodiment of this invention. . It is a schematic sectional drawing which shows another example of the reflective surface of the light reflector of the illuminating device which concerns on one embodiment of this invention. It is a schematic perspective view (a), (b) which shows another example of the light reflector of the illuminating device which concerns on one embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic perspective view (a) which shows the external appearance of the whole illuminating device which concerns on one embodiment of this invention, the schematic perspective view (b) which shows the structure inside, and the schematic side surface which expands and shows the part C It is a figure (c) and a schematic perspective view (d). It is the schematic which shows an example of the illumination intensity distribution of the signboard illumination using the illuminating device which concerns on one embodiment of this invention.

  Hereinafter, embodiments of the invention will be described with reference to the drawings as appropriate. However, the illumination device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements described below are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation.

<Embodiment 1>
FIG. 1A is a schematic perspective view showing each configuration of the lighting device according to Embodiment 1, and FIG. 1B is a schematic perspective view showing an enlarged portion A thereof. . As illustrated in FIGS. 1A and 1B, the illumination device 100 according to Embodiment 1 includes an LED 10 and a light reflector 30 provided on a support 20. More specifically, the support 20 is a box-shaped housing, and a plurality of LEDs 10 are mounted on the substrate 25, and the light reflector 30 covers the upper and left and right sides from the rear of each LED 10. The assembly of the substrate 25 and the light reflector 30 is accommodated in the support 20, and the opening of the support 20 is sealed by the cover member 40 serving as a window, The lighting device 100 is configured.

  Hereinafter, the height direction perpendicular to the upper surface of the support 20 is the z direction (z axis), the window portion of the lighting device is viewed from the front, the depth direction is the y direction (y axis), and the width direction ( The left-right direction) is the x direction (x axis). In the y direction, the front side, which is the main light emitting direction, is the front side, and the back side in the opposite direction is the rear side. Furthermore, a plane substantially parallel to the upper surface of the support 20 (a plane including the x axis and the y axis) is described as an xy plane, and a plane including the y axis and the z axis is described as a yz plane.

  2A is a schematic perspective view of the light reflector of the lighting apparatus according to Embodiment 1, FIG. 2B is a schematic front view thereof, and FIG. It is a schematic sectional drawing which shows the BB cross section of b). 3A is a graph showing an example of the light distribution of the LED, and FIGS. 3B and 3C conceptually illustrate the light irradiation by the light reflector of the illumination device of the first embodiment. 3 (b) shows a cross section substantially parallel to the yz plane, and FIG. 3 (c) shows a cross section substantially parallel to the xy plane. As shown in FIG. 3 (a), many LEDs have a maximum value of luminous intensity directly above, that is, in a direction in which the inclination angle θ from the central axis (z-axis) of the LED is about 0 °. As the value increases, the light intensity gradually decreases. In particular, there are some which can be approximated to “Lambertian light distribution” in which the luminous intensity in the θ direction is proportional to cos θ (cosine θ; cosine).

Then, as shown in FIG. 3B, when the reflecting mirror portion 35 of the light reflector 30 is provided so as to cover the LED 10 directly from behind the LED 10, the light is emitted above and behind the LED 10. At least a part of the emitted light is reflected forward by the reflecting mirror part 35. By the way, the light emitted from the illuminating device and irradiating a distant irradiation surface away from the device has a long optical path length compared to the light irradiating the irradiation surface directly under the device, so that the attenuation is large and incident on the irradiation surface. Since the angle increases, the illuminance component in the direction perpendicular to the irradiation surface is reduced. Therefore, the reflected light component (L _{R1 to} L _R2 ) having a high luminous intensity emitted from the LED 10 in a direction with a small absolute value of θ and reflected by the reflecting mirror unit 35 is irradiated onto the irradiation surface far from the illumination device, and the θ 10 The reflected light components (L _{R4 to} L _R3 ) having a low luminous intensity emitted in the direction in which the absolute value of the light is reflected and reflected by the reflecting mirror unit 35 are irradiated onto the irradiation surface close to the illumination device. In this way, an illuminance distribution with high uniformity can be obtained.

Further, in front of the illumination device, a direct light component (L _{D1 to} L _D4 ) directly emitted forward from the LED 10, and a reflected light component (L _D1 ) emitted upward or backward from the LED 10 and reflected by the reflecting mirror unit 35. _{R1 to} L _R4 ) are added and emitted. Therefore, the reflected light component having a high luminous intensity (for example, L _R1 ) emitted from the LED 10 in the direction with a small absolute value of θ and reflected by the reflecting mirror portion 35 and the luminous intensity directly emitted from the LED 10 in the direction with a large absolute value of θ. Low direct light component (for example, L _D4 ) and the reflected light component (for example, L _{R4) having} a low luminous intensity emitted from the LED 10 in the direction in which the absolute value of θ is large and reflected by the reflecting mirror unit 35. ) And the direct light component (for example, L _D1 ) having a high luminous intensity directly emitted from the LED 10 in the direction in which the absolute value of θ is small, the area ratio of each small mirror is adjusted. Thus, it is possible to obtain an illuminance distribution with a higher degree of uniformity.

  Therefore, as shown in FIGS. 2A to 2C, the light reflector 30 has a reflecting mirror portion 35 extending from behind the LED 10 so as to cover the LED, and this reflecting mirror 30 is provided. The unit 35 is composed of a plurality of small piece mirrors 36 (hereinafter, four of 36a, 36b, 36c, and 36d in the figure) arranged from the rear of the LED 10 directly above the LED 10. Each of the small mirrors 36 has reflection surfaces 37 having different areas, focal lengths, and inclination angles from the upper surface of the support 20, and can generate reflected light having different light fluxes, condensing degrees, and optical axes. Yes. And the small piece mirror 36 has the reflective surface 37 which the area is large, the focal distance is long, and it inclined more to the support body side, so that it is arrange | positioned near LED10. With this configuration, it is possible to obtain an illuminance distribution having a reflection function as described above and having high uniformity on the irradiated surface. The irradiation range of the reflected light by the concave mirror expands in proportion to L / f when the optical path length is L [mm] and the focal length of the concave mirror is f [mm], but generates reflected light in the distance. Since the focal length f of the reflecting surface 37 of the small piece mirror 36 is long, the spread of the irradiation range in the distance can be suppressed.

  As shown in FIG. 3C, the reflecting surface 37 of each small mirror 36 is curved in a cross section substantially parallel to the xy plane. Therefore, the reflecting mirror unit 35 has the above-described reflection function even for light emitted obliquely backward from the LED 10, and increases the uniformity of a wide range of illuminance distribution having a width in the x direction. be able to. Furthermore, in addition to the vertical direction, that is, the yz plane, it has a condensing function in the horizontal direction, that is, the xy plane, so that the light emitted from the LED 10 can be used efficiently and the glare can be reduced. The term “curved” here is not limited to the reflective surface 37 formed of a single surface as long as the shape of the entire reflective surface is curved. It is used in the meaning that includes a plurality of surfaces.

  Furthermore, it is preferable that the reflecting surface 37 of each small piece mirror 36 extends so as to cover the left and right sides of the LED 10. As the amount of forward extension of the reflecting surface 37 increases, the light emitted from the LED 10 obliquely backward to sideward is easily reflected forward, and the light utilization efficiency can be increased. In addition, when the plurality of LEDs 10 are arranged in the left-right direction, the reflection surface 37 extends so as to cover the left and right sides of the LED 10, thereby suppressing an increase in stray light components and light loss. The light use efficiency of each LED 10 can be increased and the light distribution of the lighting device can be suitably controlled. In addition, when several LED10 is arranged on the support body 20, it is preferable that the reflective mirror part 35 is provided with two or more corresponding to each LED10. At this time, as in this example, one light reflector 30 may be provided with a plurality of reflecting mirror portions 35 corresponding to each LED 10, and the light reflector 30 having one reflecting mirror portion 35 may be provided for each LED 10. A plurality of them may be provided correspondingly.

  The reflection surface 37 of the small piece mirror 36 can be constituted by a part of a paraboloid, a spherical surface, an ellipsoid, a hyperboloid, and the like, and is preferably arranged so that the center of the upper surface of the LED 10, particularly the upper surface thereof, is substantially focused. In particular, the paraboloid is most suitable. If it is a surface range that can be regarded as a paraxial region near the apex of the concave curved surface, it may be formed of a spherical surface that is easy to manufacture.

  FIG. 4 is a schematic view showing another example of the reflecting surface of the small mirror, and shows a cross section substantially parallel to the xy plane. As shown in FIG. 4, the reflecting surface 37 of each small mirror may be composed of a plurality of concave curved surfaces arranged at an angle to each other in the xy in-plane direction. As a result, a plurality of reflecting mirror portions 35 are arranged in parallel with each other at an angle in the xy plane direction with respect to one LED 10. With such a reflective surface 37, it is possible to intentionally widen a part of the irradiation range, irradiate a plurality of spots, or obtain various irradiation patterns. For example, it is suitable for illumination of intersections and parking lots. It can be a light distribution. In addition, the reflecting surface 37 of each small mirror may be formed as a concave curved surface by combining a plurality of minute planes, for example. In this case, it is possible to add a function of reducing the color unevenness and brightness unevenness of the LED 10.

  The light reflector 30 has an elastic portion 38 having a spring function on the upper surface thereof, and has a hook-like protrusion serving as a positioning portion 39 on the lower surface. Thereby, the light reflector 30 can be accurately and easily installed on the support 20 with respect to the LED 10. In addition, the light reflector 30 has a function of pressing the substrate 25 against the support 20 to enhance the heat dissipation of the substrate 25. Also in this respect, the light reflector 30 extends to cover the left and right sides of the LED 10. It is preferable to have a mirror part 35.

  FIGS. 5A and 5B are schematic perspective views illustrating another example of the light reflector of the illumination device according to the first embodiment. 5 (a) and 5 (b), the light reflector 31 in the example shown in FIGS. 5 (a) and 5 (b) has a smaller amount of extension to the front of the reflecting surface 37 of each small mirror than the above-described light reflector 30, and It is a form to open. Although such a light reflector 31 is thin, an illuminance distribution with high uniformity can be obtained, and the size of the lighting device can be reduced. Further, when a plurality of reflecting mirror portions 35 are provided, the reflecting mirror portions 35 are not limited to be arranged in a straight line, and may be provided with an angle to each other.

<Embodiment 2>
6 (a) is a schematic perspective view showing an overall appearance of the lighting apparatus according to Embodiment 2, and FIG. 6 (b) is a schematic perspective view showing an internal configuration thereof, and FIGS. FIG. 6D is a schematic side view and a schematic perspective view showing a part C of FIG. For street lamps and street lights, the central luminous intensity (luminous intensity in the direction of the central axis of the device) is low and an oblique direction (for example, around ± 60 ° from the central axis of the apparatus) is obtained in order to obtain a highly uniform illumination distribution on the road surface. A lighting device having a “batwing light distribution” having a maximum value of luminous intensity is suitable. The illumination device 200 of the second embodiment has a preferable configuration for realizing such light distribution.

As shown in FIGS. 6A to 6D, in the lighting device 200 according to Embodiment 2, the support 21 has two upper surfaces provided obliquely to each other, and the two upper surfaces are arranged on the two upper surfaces. A pair of LED 10 and light reflector 32 is provided. The light reflector 32 includes one reflecting mirror unit 35 having the configuration described in the first embodiment. Hereinafter, a pair of the LED 10 and the light reflector 32 provided on one upper surface of the support 21 (a group including all of the pairs when there are a plurality of pairs) is referred to as one “light source unit”. The first light source unit 51 and the second light source unit 52 are installed so that the reflection surfaces 37 of the respective light reflectors 32 face each other, and the light source units 51 and 52 emit light toward the back of each other. It is the structure which radiate | emits. In the illumination device 200, since the light source units 51 and 52 are arranged to rotate around the x axis as the rotation center axis, the center axis of the device is the z ₂ axis and the same x ₂ axis as the x axis in the figure. The y2 axis perpendicular to these _two axes is newly defined.

  The inclination angle Φ with respect to the horizontal plane of each upper surface of the support 21 is preferably set to 30 ° or more and 60 ° or less in order to suppress interference of light emitted from the light source units 51 and 52 and to obtain an illuminance distribution with high uniformity. . The support 21 may be configured by connecting two supports (heat radiating members) at an angle to each other by a connecting member as in the example shown in FIG. 6C, and the cross-sectional shape is substantially V-shaped. It may be a single support.

  The cover member 41 has a window portion provided substantially perpendicular to the main optical axis of each of the light source portions 51 and 52, so that internal reflection can be reduced and light use efficiency can be increased. For this reason, it is preferable that the cover member 41 has a substantially V-shaped or arcuate cross-sectional shape.

  Note that the light emission colors of the light source units 51 and 52 are not limited to the same color, for example, a combination of white, and may be different from each other, or one light source unit may have a plurality of light emission colors. For example, a small outdoor lighting device for a store can be configured by using the first light source unit 51 as white-lighted external signboard illumination and the second light source unit 52 as blue-light wall decoration. . According to the configuration of the present lighting device, the intended range can be efficiently illuminated, so that the emitted light from the first light source unit 51 becomes glare light to the store entrance, or the second light source unit 52 It is possible to prevent the emitted light from causing light damage over the wall surface.

  Hereinafter, each component of the illuminating device of this invention is explained in full detail.

(LED)
The LED 10 uses a light emitting device of a surface mount type (SMD: Surface Mount Device) or a bullet type (lamp type) in which an LED element (chip) is fixed to a resin or ceramic package base or a lead frame and covered with resin or glass. be able to. The LED element may be used as it is. Further, after the LED 10 and the light reflectors 30, 31, 32 are provided on the supports 20, 21, the reflecting mirror portion 35 of the light reflector may be filled with resin, and the resin may be covered with the LED 10. . Further, the package base or covering member contains a wavelength conversion member such as an aluminum oxide phosphor, a nitride phosphor or a silicate phosphor, or a light diffusion member such as alumina, silica or titanium oxide. Can do. Further, a plurality of LED elements having different emission wavelength ranges such as red, green, and blue may be combined. The LED 10 is electrically connected to the wiring of the substrates 25 and 26 by a conductive bonding member such as Ag, Au, and Sn. Further, when the package base of the LED 10 has a mechanism such as a screw hole, the substrates 25 and 26 may be omitted and the LED 10 may be directly fixed to the supports 20 and 21. In addition, the LED 10 can be fixed by a holder or the like having a power feeding and fixing mechanism.

(Support)
The supports 20 and 21 are members that serve as pedestals for installing the LEDs 10, and may include the substrates 25 and 26. The supports 20 and 21 are preferably made of a material having excellent thermal conductivity. For example, a metal plate, more specifically, a metal material such as an aluminum alloy, stainless steel, iron, copper, or the like, or an aluminum alloy extruded or cast-molded and coated or anodized. It is done. The supports 20 and 21 can be used in various shapes, and may be plate-shaped or block-shaped in addition to a box shape. In addition, as shown in FIG. 6D, the supports 20 and 21 may be provided with a large number of protrusions (fins) on the lower surface (back surface) side in order to improve heat dissipation.

(substrate)
The boards 25 and 26 are circuit boards provided with electronic parts such as resistors and capacitors and wirings for connecting the parts. The substrates 25 and 26 are preferably formed of a material having high mechanical strength and thermal conductivity and less thermal deformation. Specifically, substrates such as aluminum alloy, ceramic, glass epoxy, and glass can be suitably used. . The substrates 25 and 26 may have a rectangular shape or various shapes, and may be a single substrate or a plurality of substrates. The substrates 25 and 26 may be provided with screw holes for fixing to the supports 20 and 21. Furthermore, the board | substrates 25 and 26 may be provided with the grease and double-sided tape which are excellent in heat dissipation in the lower surface (back surface), and metal plates, such as copper and an aluminum alloy, may be joined.

(Light reflector)
The light reflectors 30, 31, and 32 are preferably formed of a resin material from the viewpoint of being relatively easy to mold and insulative with respect to the wiring of the LED 10 and the substrates 25 and 26. For example, a resin molded body such as polycarbonate, ABS, acrylic, ASA, PA, PBT, or the like obtained by vapor-depositing and plating a metal film such as aluminum or silver having high light reflectivity, or a sheet obtained by pressing an aluminum plate or the like. . Further, the reflection surface 37 of the light reflector may be subjected to a roughening process such as blasting in order to have a light diffusion effect.

(Cover member)
The cover members 40 and 41 are preferably formed of a resin material such as polycarbonate or acrylic that is lightweight, has high mechanical strength, and has high light transmittance. Glass may be used. The cover members 40 and 41 may be entirely formed of the above-mentioned material, and a window portion for emitting light to the outside of the apparatus is formed of the above-described translucent material, and other portions are light-reflective or light-shielding. For example, a metal material such as an aluminum alloy or stainless steel, a colored resin material, or the like may be used. The cover members 40 and 41 can have various shapes in addition to the plate shape. Further, the cover members 40 and 41 may be a base material in which a light diffusing material (filler) is mixed, or the surface may be subjected to a textured process, a lens array shape, a prism cut, or the like. Furthermore, in order to control the light distribution in one direction, prism cut, corrugated plate shape, hairline slit processing, etc., extending in one direction of the long or short direction may be performed. In addition, when using the infrared light emitting LED 10, a visible light absorbing plate may be used. Moreover, you may give the function of wavelength selective transmission with a coloring material. The cover members 40 and 41 may be configured to simply transmit light, and a diffusion plate, an optical filter, or the like having the same function as such a cover member may be separately provided.

  Examples according to the present invention will be described in detail below. Needless to say, the present invention is not limited to the following examples.

<Example 1>
The illuminating device of Example 1 is an example of the illuminating device 100 which concerns on Embodiment 1, Comprising: For example, it is utilized as signboard illumination. The support 20 is a cast product of a coated aluminum alloy (ADC12), and is a box-shaped casing having a width of about 346 mm, a height of about 58 mm, a depth of about 42 mm, and an average wall thickness of about 2 mm, with an opening at the front. . The support 20 has two columnar protrusions with a length of about 41.8 mm with a screw hole of M3 extending from the inner surface of the back wall at the approximate center. Further, the support body 20 has an upper wall inclined outward by about 8 ° and a lower wall and left and right side walls inclined outward by about 2 ° from the back wall toward the front. Further, a recess that fits with a part of the cover member 40 is provided on the outer periphery of the opening of the support 20.

  The substrate 25 is an aluminum substrate having a width of about 320 mm, a depth of about 28 mm, and a thickness of about 1.6 mm. On the wiring on the upper surface of the substrate 25, six LEDs 10 are arranged and mounted in the width direction at intervals of about 53 mm. The LED 10 is a surface-mount type light emitting device capable of emitting white light, in which a nitride semiconductor LED element is fixed in a recess of a resin package base and covered with a resin containing a YAG phosphor. A connector connected to the wiring is provided at one end of the substrate 25, and a power supply cable is connected to the connector through the back wall of the support 20, so that the LED 10 can be turned on by an external power source.

  Two light reflectors 30 are arranged on the upper surface of the substrate 25 in the width direction. The light reflector 30 is a molded product of black polycarbonate resin having a width of about 160 mm, a height of about 34 mm, and a thickness of about 2 mm, and has three reflecting mirror portions 35 provided at intervals similar to those of the LED 10. . This reflecting mirror part 35 is composed of four small mirrors 36 arranged from the rear to the front, covers the upper and left and right sides of the LED 10 and opens forward, and has a diameter of about 45 mm and a height of about 29 mm. It is provided in a semi-spherical shape with a depth of about 25 mm. An aluminum alloy film is deposited on the inner surface of the reflecting mirror portion 35, that is, the reflecting surface 37 of each small mirror. The four small piece mirrors 36 have larger areas, longer focal lengths, and more inclined toward the support, and the foremost small piece mirror 36 is positioned directly above the LED 10. In addition, the light reflector 30 has a plate-like portion having a depth of about 10 mm provided above each reflecting mirror portion 35. A pair of notches having a width of about 2 mm and a depth of about 8 mm are provided in the plate-like portion directly above the center of each reflecting mirror portion 35, with a center-to-center distance of about 9 mm. A curved convex portion having a diameter of about 3 mm and a height of about 1.5 mm is provided to form an elastic portion 38. The light reflector 30 has a hook-shaped positioning portion 39 having a height of about 1 mm provided on the lower surface and is temporarily fixed by being locked to a hole and an end portion of the substrate 25, and the reflecting mirror portion 35 is an end portion of the substrate 25. It is opened about 2 mm forward. When the substrate 25 and the light reflector 30 are inserted into the support 20, the convex portion of the elastic portion 38 of the light reflector 30 abuts against the inner surface of the upper wall of the support 20 and bends. 30 is fixed between the upper wall and the lower wall of the support 20.

  The cover member 40 is made of a light-transmitting acrylic resin, and has a plate-like portion having a width of about 340 mm, a height of about 52 mm, and a thickness of about 2.0 mm, and a flange portion having a L-shaped cross section (depth of about 6 mm). , And a protrusion amount of about 1 mm). In addition, a through hole having a diameter of about 3.5 mm is provided on the front surface of the cover member 40 at a location that coincides with the protrusion of the support 20. The cover member 40 is fitted into the recess of the support 20 through a rubber packing having a rectangular frame shape (total width of about 340 mm × about 53 mm) having a width of about 5.2 mm and a thickness of about 1.5 mm. Then, it is fixed to the protrusion of the support 20 with a screw through the through hole. In addition, in order to attach this illuminating device 100 to the exterior on the outer surface of the upper wall of the support body 20, the attachment member with an angle adjustment mechanism formed with the same material as the support body 20 is provided.

  The lighting device according to the first embodiment configured as described above is arranged at the lower or upper part of the signboard, and when the signboard is illuminated from a position 500 mm away from the signboard surface, for example, in a signboard with a height of about 3 m, An irradiation distribution with a high degree of uniformity in the vertical direction can be obtained. Moreover, the illumination apparatus of Example 1 can obtain an irradiation distribution with a high degree of uniformity even in the width direction by installing a plurality of lighting apparatuses side by side in accordance with the width of the signboard. As an example, FIG. 7 shows the illuminance distribution when 10 lighting devices of Example 1 (using white light-emitting LEDs with power consumption of 3 W) are arranged in the width direction and irradiated on a signboard surface having a height of about 3 m and a width of about 4 m. Show. In outdoor outdoor signboards, particularly in a bright city with external light, an illuminance of 1000 lux (lx) or more is required at the center of the irradiated surface, but as shown in FIG. Illuminance greater than lux is obtained. In addition, the installation has restrictions such as guidelines and ordinances (for example, regulation of leakage light other than signboards, and the width of the lighting device within 1 m), but in this lighting device, due to the configuration of the light reflector described above It is possible to efficiently illuminate the required range, and even at a small exit width, uniform and high illuminance can be obtained far away. Moreover, it is superior in terms of workability, safety, durability, and cost as compared with a conventional device that requires an output width of 1 m or more, and it is possible to suppress the device from being conspicuous and hindering the visibility of an irradiation target. Furthermore, when a signboard of the same size is illuminated using a mercury lamp (HID lamp), four lamps with power consumption of 150 W are required, whereas this lighting device only requires 30% power consumption. Life expectancy more than doubled.

<Example 2>
The lighting apparatus of Example 2 is an example of the lighting apparatus 200 according to Embodiment 2, and is used as, for example, a road lamp. The LED 10 is a surface-mounted LED similar to that of the first embodiment, and one LED 10 is mounted on an aluminum substrate 26 having a width of about 30 mm × a depth of about 20 mm and a thickness of about 1.6 mm. The substrate 26 has a screw fixing hole, and is fixed by a screw on a heat sink having a width of about 90 mm, a depth of about 90 mm, and a thickness of about 25 mm. This heat sink is formed by extrusion processing of an aluminum alloy, has a plurality of protrusions on its lower surface, and is designed with a thermal resistance of about 2.4 ° C./W. The light reflector 32 is a molded body of polycarbonate resin having one reflecting mirror portion 35 similar to that of the first embodiment, and a screw hole is provided on the lower surface thereof, and is fixed on the heat sink with a screw. Two modules configured as described above, the reflecting surfaces 37 of the light reflectors face each other, and are inclined so that the distance between the LED centers is about 100 mm and the inclination angle Φ with respect to the horizontal plane is about 30 °. It is arranged and fixed with a connecting member made of an aluminum alloy and having a thickness of about 2 mm. As a result, the two heat sinks are fixed by the connecting member to form the support 21. Further, the five connected modules are arranged at substantially equal intervals in the width direction, and the connecting members of each module are fixed with a single aluminum alloy support member having a thickness of about 10 mm and a screw, and the cross section is substantially V-shaped. The lighting device 200 is configured by being housed in a housing with a cover member 41 having a thickness of about 2 mm.

Lighting device of this second embodiment, in the y ₂ direction, the central axis (z ₂ axis) has a maximum value of the luminous intensity in the vicinity of ± 60 ° from the luminous intensity in the central axis direction is about 1/6 of its maximum value Has a light distribution. In addition, when an LED having a luminous flux of 1000 lumens (lm) is used and this illumination device is mounted at a height of about 10 m, the irradiation surface is about 7 m (x ₂ direction) × about 40 m (y ₂ direction). In this range, substantially uniform illuminance (about 30 lux or more) can be obtained. Thus, according to the structure of this illuminating device, the leak of the light outside glare and the intended irradiation range can be suppressed, and the light emitted from the LED can be used with high efficiency.

  The illumination device of the present invention can be suitably used for externally or internally illuminated signboard illumination, wall surface illumination, street light, crime prevention light, road light, showcase illumination, general illumination, and the like.

  DESCRIPTION OF SYMBOLS 10 ... LED, 20, 21 ... Support body, 25, 26 ... Board | substrate, 30, 31, 32 ... Light reflector (35 ... Reflective mirror part, 36 ... Small piece mirror (36a-36d), 37 ... Reflective surface, 38 ... Elastic part, 39 ... positioning part), 40, 41 ... cover member, 51, 52 ... light source part (51 ... first, 52 ... second), 100, 200 ... lighting device

Claims (3)

An LED provided on a support;
A light reflector provided on the support and having a reflecting mirror portion extending from behind the LED so as to cover just above the LED; and
The reflecting mirror part is composed of a plurality of small mirrors arranged from the rear of the LED toward the top of the LED,
The small mirror has a reflecting surface that is closer to the LED and has a larger area, longer focal length, and more inclined to the support,
The reflecting surface of each small mirror is a lighting device that is curved in a cross section substantially parallel to the upper surface of the support.   2. The illumination device according to claim 1, wherein a reflection surface of each of the small piece mirrors extends from behind the LED so as to cover left and right sides of the LED. The support has two upper surfaces provided obliquely to each other,
The lighting device according to claim 1, wherein the pair of the LED and the light reflector is provided on each of the two upper surfaces of the support body with the reflecting surfaces of the light reflector facing each other.

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