JP2013077438A - Led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting fixture capable of easily performing light distribution control, which reduces glare and is comparatively compact in size.SOLUTION: The LED lighting fixture is provided with: a base body 1 with heat-radiating properties; and a lighting unit 2 including a strip-shaped reflection face 21 in which cross sections of a parabolic shape are formed in continuation in a length direction and which is fixed to the base body at a top part side of the parabolic line, a module support substrate 22 located heat-conductively to the substrate in the vicinity of the top part side of the parabolic line of the strip-shaped reflection face, and a plurality of LED modules 23 of which the light-emitting portions are positioned almost at a focal point of the strip-shaped reflection surface and moreover which are mounted on the module support substrate each separated from each other along a length direction of the strip-shaped reflection face and project optical beams toward the right opposite region of the strip-shaped reflection face.

Description

  The present invention relates to an LED lighting device having a reflective surface.

  A reflective surface for half rotation obtained by cutting the rotating paraboloid expanding toward the illumination space along the optical axis, a side wall covering the cut portion of the reflective surface, and mounted on the side wall as a focal point of the reflective surface A lighting device can be configured by combining a plurality of light source units including light emitting elements such as LEDs arranged. According to this illuminating device, since the reflecting surface is prepared and combined for each light emitting element, it becomes easy to arrange the LED at the focal position, and light distribution control becomes easy.

  On the other hand, the ceiling plate of the elevator cab is formed into a sawtooth waveform in cross section, and an opening is formed in the vertical surface portion of the sawtooth waveform of the ceiling plate, and the opening is made of a transparent resin such as milky resin. An elevator cab lighting device can be configured by closing an illuminating plate made of a light material and arranging an LED luminaire made of LED on the back side of the illuminating plate. According to this elevator cab illumination device, the depth dimension in the vertical direction can be reduced.

JP 2011-040236 A JP 2007-182296 A

  However, in the former prior art, the reflecting surface has a semi-rotating three-dimensional shape obtained by cutting the rotating curved surface along the optical axis, and the reflecting surface and the light emitting element are combined in a one-to-one relationship to form an optical unit. Since it comprises, a lighting fixture will enlarge. Even if the light emitting element is an LED, although the beam angle is relatively small, there is also direct light that deviates to the side and does not enter the reflecting surface. Glare is likely to occur due to direct light that deviates in the direction.

  The latter prior art is difficult to control light distribution and is not suitable for general illumination purposes in which a desired area in a wide space is illuminated so as to have a desired illuminance distribution.

  An object of the present invention is to provide a relatively compact LED lighting apparatus that can easily control light distribution and reduce glare.

  In the embodiment of the present invention, the LED lighting apparatus includes a base body and a lighting unit. The substrate has thermal radiation. The lighting unit includes a strip-shaped reflecting surface, a module support substrate, and a plurality of LED modules. The band-shaped reflecting surface has a parabolic cross-sectional shape formed continuously in the longitudinal direction and is attached to the base on the top side of the parabola. The module support substrate is disposed in a heat conductive relationship with the base body at a position in the vicinity of the top side of the parabola of the belt-like reflecting surface. The plurality of LED modules are mounted on the module support substrate with the light emitting portion positioned substantially at the focal point of the strip-shaped reflecting surface and spaced apart from each other along the longitudinal direction of the strip-shaped reflecting surface. A light beam directed toward the area is projected.

  According to the embodiment of the present invention, a plurality of LED modules that are spaced apart from each other along the longitudinal direction of the strip-shaped reflecting surface are each positioned at a substantially focal point of the strip-shaped reflecting surface and are directed to the facing region of the strip-shaped reflecting surface. Therefore, it is possible to provide a relatively compact lighting device that can easily control light distribution and reduce glare.

It is a center section front view of the LED lighting fixture concerning embodiment of this invention. It is a principal part expanded sectional view similarly. It is a bottom view similarly. It is also a plan view. It is the enlarged front view and side view in the 1st aspect of a module support substrate similarly. Similarly it is an expanded sectional view of an LED module. Similarly, the light distribution characteristic of the LED module is a light distribution characteristic diagram in which the light distribution characteristics in the respective states when the LED element is single and when a lens and a light control cylinder are added are superimposed. FIG. 6 is a schematic explanatory view for explaining a facing region of a strip-like reflecting surface on which the LED module emits a light beam. It is a light distribution characteristic figure of LED lighting fixtures similarly.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 1 to FIG. 4, the LED lighting apparatus is configured to include a base 1 and a plurality of lighting units 2, and these components are included in the apparatus main body 3. It is stored.

[Base 1]
The base body 1 has thermal radiation and supports a plurality of lighting units 2 described later. This support mode supports the lighting unit 2 mechanically and thermally.

  First, the mechanical support of the lighting unit 2 by the base 1 will be described. The base 1 supports a plurality of lighting units 2 attached thereto. The positional relationship between the strip-like reflecting surface 21 of the lighting unit 2 and the LED module 23 is maintained at a predetermined level at least when attached to the base 1. In this case, the belt-like reflecting surface 21 and the LED module 23 may be separately attached to the base 1, or the lighting unit 2 in which the belt-like reflecting surface 21 and the LED module 23 are held in a predetermined positional relationship is provided in advance. After assembling, the assembled lighting unit 2 may be attached to the base 1. In any of the above configurations, the band-shaped reflection surface 21 is attached to the base 1 at the intersection of the parabola of the band-shaped reflection surface 21 and its axis, that is, near the top of the parabola, and the LED module 23 is reflected in a band shape via the module support substrate 22 Since the position near the top of the parabolic curved surface of the surface 21 can be held, the positional relationship between the belt-like reflecting surface 21 and the LED module 22 can be easily held in a predetermined state. For this reason, when assembling the LED lighting fixture, positioning between the strip-shaped reflective surface 21 and the LED module 23 is facilitated, and positional deviation between the strip-shaped reflective surface 21 and the LED module 23 is less likely to occur during use. It is effective to easily exhibit and maintain desired light distribution characteristics.

  Next, heat conductive support of the lighting unit 2 will be described. The base body 1 dissipates the heat that has increased the temperature of the LED module 23 and the belt-like reflecting surface 21 to the outside. That is, the LED module 23 generates heat and rises in temperature as the LED is turned on. Since the belt-like reflecting surface 21 is irradiated with heat together with the light beam from the LED module 23, the temperature also rises as the LED is turned on. The heat of the LED module 23 and the strip-shaped reflecting surface 21 is conducted to the base 1, so that the temperature rise of the LED module 23 and the strip-shaped reflecting surface 21 is kept below a predetermined value by configuring the base 1 to be easily dissipated to the outside. can do.

  The LED module 23 rises in temperature when the LED element 231 emits light. In addition, since the band-like reflecting surface 21 is located at a position close to the top side of the parabolic curved surface, it is a directly-facing region where the light beam of the LED module 23 is irradiated, so that the temperature rise in the region is more significant than that of other parts. Become. In the present embodiment, the portions of the LED module 23 and the belt-like reflecting surface 21 where the temperature rise is high are located close to the base 1, so that heat conduction to the base 1 is performed quickly.

  By the way, the form of the substrate 1 is not particularly limited. In the embodiment shown in FIG. 1, a base body portion 1a formed by forming an aluminum plate having a thickness of, for example, about 4 mm in a disk shape, and a cylinder made of aluminum protruding backward from the center portion of the base body portion 1a. And a body part 1b. The cylindrical portion 1b is disposed at a position where the temperature rise of the base body 1 is increased, and the heat radiation area and heat capacity of the portion are increased by the arrangement, so that the heat radiation action is improved. Therefore, the cylindrical part 1b acts as a heat radiating fin. However, if desired, radiating fins can be provided over substantially the entire back side of the substrate 1.

  Further, the base body 1 can constitute a part of the outline of the LED lighting apparatus. In this case, the luminaire main body for housing the base body 1 is not required, or the base body 1 constitutes a part of the outer shell, so that the luminaire main body can be appropriately reduced in size.

  The heat radiation property of the substrate 1 is not particularly limited as long as the substrate 1 has an action of heat radiated from the surface of the substrate 1 from the LED module 22 and the belt-like reflecting surface 21. In addition, as a metal, metals with favorable heat conductivity, such as aluminum, aluminum die-casting, and copper, are suitable. Further, by applying a surface treatment to the base material of the base body 1, the thermal radiation can be enhanced. As a surface treatment suitable for this, for example, a paint film or an anodized film is effective.

[Lighting unit 2]
The illumination unit 2 includes a strip-shaped reflecting surface 21, a module support substrate 22, and a plurality of LED modules 23. In this embodiment, as shown in FIG. 2, three sets of annular illumination units 2A, 2B, 2C are disposed concentrically with respect to the base 1.

(Strip-shaped reflective surface 21)
As shown in an enlarged view in FIG. 2, the band-shaped reflecting surface 21 has a parabolic shape in cross section, and the cross-sectional shape is formed continuously in the longitudinal direction, and has a band shape as a whole. In the present embodiment, the parabolic shape is a concept including an approximate parabolic shape. For this reason, the position of the parabolic focus of the cross section of a reflective surface exists continuously along the longitudinal direction of a strip | belt-shaped reflective surface. Therefore, the overall shape of the belt-like reflecting surface 21 that does not include the paraboloid of the rotating paraboloid is allowed. For example, in addition to the ring shape shown in FIG. 1, although not shown, a linear shape, a polygonal shape, a curved shape, a waveform, a key shape, and the like can be appropriately selected and employed. However, any overall shape is common in that the cross-sectional shape orthogonal to the longitudinal direction has a parabolic shape.

  The surface state of the belt-like reflecting surface 21 is preferably basically a specular reflecting surface. However, if desired, a slight degree of diffusibility may be added. The material of the belt-like reflecting surface 21 is not particularly limited, but a material using a metal such as aluminum having good heat conduction as a base material is preferable. Note that the reflectivity can be further enhanced by surface treatment such as plating.

  Further, as shown in FIG. 2, the belt-like reflecting surface 21 is allowed to include an attachment portion 21 a for the base 1. In the embodiment shown in FIG. 1, the attachment portion 21a is formed of a bent edge extending from the end portion on the top side of the belt-like reflecting surface 21 and formed along the longitudinal direction. In FIG. 1, it is fixed to the lower surface.

  Further, the band-like reflecting surface 21 is allowed to include a side edge portion 21b that is bent outwardly from the opening end and extends. In the illustrated embodiment, the side edge portion 21b extends to the back surface side, that is, outside of the belt-like reflecting surface 21 along a plane including the open end. If the width dimension of the side edge 21b is set relatively small as shown in FIG. 2, when viewed from the illumination space side, the module support substrate 22 of the adjacent illumination unit 2 or the substrate side of the LED module 23 Can be covered. By doing so, the appearance of the LED lighting apparatus is improved, and the beauty of the LED module 23, which will be described later, can be seen, and the beauty of the function is taken into account, thereby further improving the appearance. In addition, when viewed from the illumination space side by increasing the width dimension of the side edge portion 21b as desired, almost the entire LED module 23 of the adjacent illumination unit 2 does not hinder the light distribution of the LED lighting fixture. It can be configured to cover. Thereby, the LED module 23 becomes invisible and the appearance of the LED lighting apparatus is simplified, so that the appearance is further improved.

(Module support board 22)
As shown in FIG. 2, the module support substrate 22 is mounted directly or indirectly on the base body 1 with the light emitting portion of the LED module 23 placed at a substantially focal position of the parabola of the band-like reflecting surface 21. Means. Therefore, when arranging the plurality of LED modules 23 along the longitudinal direction of the strip-shaped reflecting surface 21, the parallel relationship with the longitudinal direction of the strip-shaped reflecting surface 21 is maintained and the plurality of LED modules 23 are separated from each other. It can be supported in a state.

  The module support substrate 22 also functions as means for attaching the LED module 23 to the base 1 in a heat conducting relationship simultaneously with the mechanical support. For this purpose, the module support substrate 22 is preferably formed using a material having a relatively high thermal conductivity, such as aluminum.

  Further, the module support substrate 22 may support the LED module 23 on the base 1 via the strip-shaped reflection surface 21 in addition to directly attaching the LED module 23 to the base 1, or the LED module 23 and the strip-shaped reflection surface 21 in advance. May be attached to the substrate 1 after being supported in a predetermined positional relationship.

  Furthermore, the module support substrate 22 may be independent of the LED module 23 in a one-to-one relationship, and a plurality of module support functions are integrally provided so as to correspond to a plurality of, for example, three LED modules 23. The connection structure can be made. In this case, the assembly work of the module support substrate 22 with respect to the base body 1 is facilitated.

  Furthermore, the module support substrate 22 can be configured so that the position of the strip-like reflecting surface 21 of the LED module 23 with respect to the parabola focus can be adjusted as desired. Thereby, the light distribution characteristic of LED lighting fixtures can be adjusted widely. That is, if the position of the light emitting part of the LED module 23 is located at the focal point of the parabola, a narrow-angle light distribution characteristic can be obtained, so that a downlight type or a light emitting type LED lighting apparatus can be provided. On the other hand, if the light emitting portion of the LED module 23 is positioned slightly away from the focal point, a relatively wide-angle light distribution characteristic can be obtained, and an LED lighting apparatus suitable for general lighting can be obtained. However, in any case, the position of the light emitting part of the LED module 23 with respect to the parabola may be adjusted within the focal point and the vicinity thereof, so that it can be seen that the LED module 23 is located substantially at the focal point. In order to adjust the position of the strip-shaped reflecting surface 21 of the LED module 23 with respect to the focal point of the parabola, it is preferable to displace the position of the light emitting portion of the LED module 23 on the axis of the parabola and back and forth. Then, adjustment becomes relatively easy, and the structure of the module support substrate 22 becomes relatively simple.

  In the illustrated embodiment, as a first aspect, the module support substrate 22 is formed by bending the leg pieces 22a and the leg pieces 22b at right angles as shown in FIG. 1, FIG. 2, and FIG. It has a key shape. One leg piece 22a is formed with two mounting holes 22a1 and 22a1 which form a pair for mounting the LED module 23. Also, two mounting holes 22a2 and 22a2 are formed in pairs at positions slightly spaced from the mounting holes 22a1 and 22a1. The latter mounting holes 22a2 and 22a2 are used when adjusting the light distribution characteristics of the LED lighting apparatus by changing the position of the strip-like reflecting surface 21 of the LED module 22 with respect to the focal point. Then, the LED module 23 is mounted on the module support board 22 using the two screws b2. Further, a mounting hole 22b1 is formed in the leg piece 22b, and the module support board 22 is mounted to the base 1 by a screw b3 using the mounting hole 22b1.

  Further, as shown in an enlarged view in FIG. 2, the module support substrate 22 has a lower end of a cylindrical body portion 1b located at the center of the base body 1 and integrally extends through the base body portion 1a as shown in FIG. These are arranged by projecting to the lower surface side of the substrate 1. The annular portion formed by the module support substrate 22 of the second aspect is closed by the surface member 221 in order to adjust the appearance. The module support substrate 22 of the second aspect is used for the illumination unit 2A disposed in the center of the base body 1.

(LED module 23)
As can be understood from FIG. 2, a plurality of LED modules 23 are disposed along the longitudinal direction of the strip-shaped reflecting surface 21. In this arrangement, the plurality of LED modules 23 are mounted on the module support substrate 22 so that the respective light emitting portions are located at substantially the focal points of the strip-shaped reflecting surface 21. In addition, each LED module 23 projects a light beam onto a directly facing region of the strip-shaped reflecting surface 21. This light beam is arranged in advance so as to go to the facing region of the band-like reflecting surface 21.

  The facing area of the belt-like reflecting surface 21 is described as follows in the plane including the central axis of the light beam emitted from the LED module 23. That is, it is limited to the central portion of the strip-shaped reflecting surface 21 orthogonal to the central axis and the periphery of the central portion in a range in which the reflected light of the light beam incident on the strip-shaped reflecting surface 21 is in a substantially desired controlled direction. Is done. Therefore, the above-described facing region is limited to a relatively narrow range in which controlled reflected light as a parabolic reflecting surface is substantially obtained.

  By the way, the light beam arranged so as to be directed to the facing area means that when the light beam is irradiated from the LED module 23 toward the facing position of the strip-shaped reflecting surface 21, light in the main intensity range of the light beam is emitted. It means that it has been previously narrowed so as to irradiate the directly facing position of the band-like reflecting surface 21. Then, the light beam is spread and deviates from the facing position of the band-shaped reflecting surface 21 and irradiates the non-facing region or the outside of the band-shaped reflecting surface 21 where the desired controlled reflection characteristic by the parabolic reflecting surface cannot be obtained. Nothing will happen. When the light beam is applied to the non-facing region of the belt-like reflecting surface 21, it does not reflect in a desired controlled direction, which causes the light distribution characteristics of the LED lighting fixture to be disturbed. Further, when at least a part of the light beam deviates from the belt-like reflecting surface 21, glare is likely to occur.

  The preferable range of the arranged light beam can be expressed by a 1/2 beam angle as follows. That is, it is generally about 5 to 30 degrees. When the 1/2 beam angle is less than 5 °, it is possible to irradiate the light beam intensively on the directly facing region of the belt-like reflecting surface 21, but the light unevenness is easily noticeable when the illumination space is illuminated. When the 1/2 beam angle exceeds 30 °, the ratio of irradiating the non-facing region increases when the light beam is projected onto the band-shaped reflecting surface, and thus the light distribution characteristics of the LED lighting apparatus are likely to be disturbed. In addition, the range of the preferable 1/2 beam angle of a light beam is 10-25 degrees, and if it is this range, it will become easy to provide the LED lighting fixture provided with the favorable narrow angle light distribution characteristic. Even more preferably, the 1/2 beam angle range is 15-23 °.

  The specific configuration of the LED module 23 that generates a light beam arranged so as to be directed to the facing region of the band-shaped reflecting surface 21 is not particularly limited in the present invention. A preferred configuration example is as follows. That is, as shown in FIG. 6, the LED module 23 includes an LED element 231, a lens 232, and a light control cylinder 233.

  The LED element 231 includes a surface mount LED 231a and a wiring board 231b. The surface-mounted LED 231a is a white light emitting type, and includes a package substrate PB, an encapsulating resin SR, and an LED chip (not shown). The package substrate PB has a circular support step at the center and is not shown, but a pair of connection terminals extends to the back side. The encapsulating resin SR is exposed from the center of the package substrate PB, and the outer surface has a hemispherical shape. Although not shown, a plurality of LED chips are encapsulated in an encapsulating resin SR and connected to the pair of connection terminals. The wiring board 231b is a printed wiring board, and includes wiring (not shown), and has an external connection terminal t and a mounting hole h. The wiring is connected to a pair of connection terminals of the LED element 231. The external connection terminal t is connected to the surface-mounted LED 231a via the wiring and is connected to an external LED lighting circuit (not shown). The attachment hole h functions when the LED element 231 is attached to the module support substrate 22 in cooperation with the screw b2 shown in FIG.

  The lens 232 is a main optical means for adjusting the light emitted from the LED element 231 into a light beam directed toward the directly facing area of the strip-shaped reflecting surface 21. The light emitted from the surface-mounted LED 231a enters the lens 232 from one end and is adjusted by the optical action of the lens, so that a light beam directed toward the directly facing region of the belt-like reflecting surface 21 is emitted from the other end. In the present invention, it is sufficient that the lens 232 has the above-described light control action, and the specific structure and light control action for that purpose are not particularly limited. Further, in the case where the LED element 231 has a light distribution characteristic that is adjusted to a light beam directed toward the directly facing region of the strip-shaped reflecting surface 21, the lens 232 may not be used. However, when the LED element 231 has a wide light distribution characteristic, a lens structure described below can be employed as an example.

  That is, in the illustrated embodiment, the entire lens 232 is formed in, for example, a rotating paraboloid, and has a cylindrical side surface extending in the axial direction from the top of the rotating paraboloid. The back end is provided with a cavity part c forming a convex lens part cvl, and further provided with a micro lens ml on the open end side surface of the paraboloid of revolution. The hemispherical encapsulating resin SR portion of the LED element 231 serves as a light emitting portion of the LED module 23 and is placed inside the hollow portion c so as to be positioned at a substantially focal point of the rotating paraboloid. Yes.

  The light-control cylinder 233 reduces or blocks the diverging light, that is, stray light, so that the light deviating from the light beam directed to the facing region of the strip-shaped reflecting surface 21 does not cause glare, and preferably the stray light. Is used for the light beam toward the facing region. In this sense, the light control cylinder 233 does not necessarily require a combination with the lens 231.

  The light control cylinder 232 is preferably manufactured using a light-reducing or light-shielding material. Further, the light control cylinder 232 can be configured such that its inner surface is preferably reflective so that light deviating from the light beam is reflected back into the light beam.

  In the illustrated embodiment, the light control cylinder 232 surrounds the side surface of the lens 232. The stray light emitted from the side surface of the lens 232 can be reduced or shielded, and at least a part of the stray light can be reflected back into the lens 232 and added to the light beam. Thereby, optical loss can be reduced.

  The light control cylinder 233 can also function as a holder for the lens 232. That is, the light control cylinder 233 has a substantially truncated conical cylindrical shape as a whole, and the cavity c of the lens 232 faces the opening o1 on the truncated side, and the opening o2 on the open end side. The lens 232 is held inside the lens 232 so that the surface on the open end side of the rotational paraboloid of the lens 232 faces. The opening o1 is locked to the support step portion of the package substrate PB and is bonded to the package substrate PB.

  The LED element 231, the lens 232, and the light control cylinder 233 described above are integrated to form the LED module 23. The plurality of LED modules 23 generate light beams that are dispersed along the longitudinal direction of the strip-shaped reflecting surface 21 and that are spaced apart from each other toward the facing region of the strip-shaped reflecting surface 21.

[Lighting fixture body 3]
In the illustrated embodiment, the LED lighting apparatus is a downlight mainly suitable for public facilities having a high ceiling such as a gymnasium, as shown in FIGS. 1 and a plurality of lighting units 2 are housed. The luminaire main body 3 includes a housing H having a box shape as a whole. In the housing H, the lower surface portion 31 is opened to form a light projection window. A transparent plate 31a is disposed in the light projection window. The transparent plate 31a is made of, for example, a plastics plate or a glass plate, and is fixed in advance to the side edge portion 21b of the band-like reflecting surface 21 by means such as screwing. For this reason, the position on the opening end side of the belt-like reflecting surface 21 is fixed by the transparent plate 31a, and the light reflecting action is stabilized. A large number of air holes 32 a are formed in the side surface portion 32. The side surface portion 32 and the lower surface portion 31 are integrated, but these are configured to be detachable from the upper surface portion 33 using a plurality of bolts B.

  Further, as shown in FIG. 4, a pair of suspension holes 33a and 33a and a power supply introduction hole 33b are formed in the upper surface portion 33 of the housing H, and the LED lighting circuit LOC, fuse box FB and Terminal block TB is arranged. The suspension can be performed by appropriately selecting and using various known suspension means such as a pair of pipes (not shown). A heat shield plate 34 is disposed below the LED lighting circuit LOC, the fuse box FB, and the terminal block TB, and is suspended from the lower surface of the upper surface portion 33 by a plurality of support arms 35. This avoids an undesired increase in temperature due to heat dissipated from the substrate 1.

  Further, as shown in FIG. 1, the peripheral portion of the base 1 is suspended in electrical insulation relation via a plurality of support arms 36 on the upper surface portion 33 of the luminaire main body 3. The suspended height of the base body 1 is such that when the side surface portion 32 and the lower surface portion 31 of the housing H are attached to the upper surface portion 33, the open ends of the strip-like reflecting surfaces 21 of the plurality of illumination units 2 attached to the lower surface of the base body 1 It is set in advance so as to approach the inner surface of the transparent glass plate 31a of the lower surface portion 31.

[Operation of LED lighting equipment]
Next, the optical action for mainly determining the light distribution characteristic of the LED lighting apparatus will be described with reference to FIGS.

  In this embodiment, when the LED lighting apparatus is turned on, the LED elements 231 of the plurality of LED modules 23 in the plurality of lighting units 2 are turned on, and the band-like reflecting surface 21 as shown by the curve A in FIG. White light beams arranged so as to be directed to the facing area are projected onto the facing area of the band-shaped reflecting surface 21, respectively. As can be understood from the curve A, this light beam has a narrow-angle light distribution characteristic.

  First, in the illustrated embodiment, an optical action in which the light beam emitted from the LED module 23 becomes a light beam arranged so as to be directed to the facing region of the strip-shaped reflecting surface 21 will be described. That is, the light beam arranged so as to be directed to the directly facing region of the strip-shaped reflecting surface 21 is formed as follows.

  White light radiated to the outside from the surface of the encapsulating resin SR of the surface-mounted LED 231a of the LED element 231 has a wide-angle light distribution characteristic as shown by a curve B in FIG. Since the encapsulating resin SR has a hemispherical shape, forms a light emitting portion, and is located at the focal point of the paraboloid of revolution within the cavity c of the lens 232, it has the wide-angle light distribution characteristics of the surface-mounted LED 231a. Of the emitted light, direct light traveling in the 0 ° direction travels through the cavity c and enters the convex lens portion L1 at the innermost part of the cavity. This direct light is collected by the convex lens portion L1 and emitted from the front surface of the lens 232 to the outside. On the other hand, most of the light emitted from the surface-mounted LED 231a in the other direction is incident on the inside of the lens 232 whose outer surface forms a paraboloidal shape from the side surface of the cylindrical cavity c. Most of the light reaches the inner surface of the rotating paraboloid, is totally reflected by the inner surface, and is reflected substantially parallel to the axial direction of the rotating paraboloid, that is, in the 0 ° direction, and is emitted from the front surface of the lens 232 to the outside. As a result, the light obtained by combining the direct light and the reflected light is evenly arranged when passing through the minute lens ml disposed on the exit surface of the lens 22. As a result, the light emission having a wide-angle light distribution characteristic at the stage of the LED element 231 is adjusted in the process of traveling through the lens 232, narrowed down as shown by a curve A in FIG. A light beam is formed that is oriented toward the opposite region. For this reason, in the illustrated embodiment, the light emitted from the LED element 231 has a wide-angle light distribution characteristic, and can contribute to the light distribution of the LED lighting apparatus without being projected onto the facing region of the strip-shaped reflecting surface 21. Although there is no useless light flux, since the useless light flux is converted into an effective light flux that contributes to the light distribution of the LED lighting fixture in the process of passing through the lens 232, there is an effect that the efficiency of the fixture is increased.

  Next, the optical action for forming the light distribution characteristic of the LED lighting apparatus will be described with reference to FIG. 8A shows a light beam that is orthogonal to the parabolic axis of the band-shaped reflecting surface 21 and is directed to the facing region of the band-shaped reflecting surface emitted from the LED module 23 on the plane including the focal point. It is a schematic diagram demonstrated in contrast with the light beam which goes to an area | region. Further, FIG. 8B shows that the band-like reflecting surface 21 is formed on the surface including the axis of the parabola and the central axis of the light beam projected from the LED module 23 to the directly facing region of the band-like reflecting surface 21. It is a schematic diagram explaining the light beam which goes to a pair area | region in contrast with the light beam which goes to a non-facing area | region. In the figure, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals. Of the arrows in the figure, the solid line indicates the ray trajectory toward the facing region, and the dotted line indicates the ray trajectory toward the non-facing region. Further, in FIG. 8A, the long dotted line indicates the focal position along the longitudinal direction of the strip-shaped reflecting surface 21, the point x indicates the axial position of the strip-shaped reflecting surface 21, and the one-dot chain line indicates a rotating paraboloid for comparison. A surface reflection surface is shown, respectively. In FIG. 8B, the line x indicates the axis of the band-like reflecting surface 21. Note that the LED lighting device exhibits a narrow-angle light distribution characteristic as shown in FIG.

  First, the facing area of the belt-like reflecting surface 21 will be described. In the present embodiment, the LED module 23 has its light emitting portion positioned at the focal point of the strip-shaped reflecting surface 21, and light projection of the light beam from the LED module 2 toward the strip-shaped reflecting surface 21 is performed on the facing region. . As shown by the solid lines in FIGS. 8A and 8B, the light projecting to the directly facing area is substantially out of the directly facing light beam l1 and its surroundings, but slightly out of range. And light rays l2, l3 and l4, l5 that are directly opposite. The light beam emitted from the LED module 23 has a narrow-angle light distribution characteristic as shown in FIG. However, although it is slightly out of the range from the above-described true facing state, it is formed to include substantially facing light rays l2, l3 and l4, l5.

  In FIG. 8A, when the light beam l1 is incident on the band-shaped reflecting surface 21, it becomes reflected light that is parallel to the parabola axis x and that travels to the back surface side perpendicular to the paper surface. Similarly, when the light beams l2 and l3 are incident on the band-shaped reflecting surface 21, the reflected light spreads slightly upward or downward in the drawing relative to that of the light beam l1, but the reflected light travels substantially orthogonally to the back side of the paper surface. Become.

  In FIG. 8B, when the light beam l1 is incident on the band-shaped reflecting surface 21, it becomes reflected light parallel to the parabola axis x. Similarly, when the light beams l4 and l5 are incident on the band-shaped reflecting surface 21, the reflected light spreads slightly left or right in the drawing with respect to that of the light beam l1, but there is no significant difference compared to the traveling direction of the light beam l1.

  On the other hand, in FIG. 8A, light rays l6 and l7 indicated by dotted lines are included in the light beam when the light beam emitted from the LED module is not arranged, and the radiation angle from the LED module 23 is obtained. Therefore, the light beam is projected toward the non-facing region of the band-shaped reflecting surface 21. For this reason, the reflected light of the light beams l6 and l7 by the band-shaped reflecting surface 21 is not shown, but spreads upward or downward in the figure relative to that of the light beam l1.

  In FIG. 8B, the light beams l8 and l9 are included in the light beam when the light beam emitted from the LED module is not arranged, and the radiation angle from the LED module 23 is large. When the light enters the reflected light, the reflected light greatly spreads to the left or right in the figure with respect to that of the light beam l1. For this reason, the desired light distribution characteristic of the LED lighting apparatus cannot be obtained. Further, the l20 light beam l10 is also included in the light beam in the case where the light beam emitted from the LED module is not arranged, and cannot be incident on the band-shaped reflecting surface 21 and deviates outward. For this reason, glare may occur due to the light beam l10.

  As described above, according to the present embodiment as described, the light beam radiated from the LED module 23 is arranged and the light beam is directed to the directly facing region of the belt-like reflection surface 21, so that the belt-like reflection surface 21 has a belt shape. Nevertheless, since the controlled reflecting action by the parabolic reflecting surface can be obtained, an LED lighting apparatus having desired light distribution characteristics can be provided. FIG. 9 shows a narrow-angle light distribution characteristic as an example of the light distribution characteristic of the LED lighting apparatus in the present embodiment.

  On the other hand, since the light beam of the LED module is not arranged, the light beam is widened, and in the case of the comparative example in which the light is projected also to the non-facing region of the band-like reflective surface 21, As indicated by the light rays l6 to 20 indicated by the dotted lines described above, desired light distribution characteristics cannot be obtained. As indicated by the alternate long and short dash line, if the reflecting surface for the LED module is a paraboloid, the focal point is concentrated in one place even if the light beam emitted from the LED module has a wide angle. The light distribution characteristics can be obtained. However, in this case, since it is necessary to arrange the reflecting surface so as to satisfy the one-to-one relationship with respect to the LED module 23, the LED lighting apparatus is increased in size.

  DESCRIPTION OF SYMBOLS 1 ... Base | substrate, 1a ... Base | substrate main-body part, 1b ... Cylindrical body part, 2 ... Illumination unit, 3 ... Luminaire main body, 21 ... Band-shaped reflective surface, 21a ... Mounting part, 21b ... Side edge part, 22 ... Module support substrate, 23 ... LED module, 31 translucent window, 32 ... side surface part, 33 ... upper surface part, 221 ... surface member, 231 ... LED element, 231a ... surface mounted LED, 231b ... wiring board, 232 ... lens, 233 ... light control Cylindrical body, c ... hollow part, cvl ... convex lens part, H ... housing, ml ... micro lens, ol ... opening, o2 ... opening, PB ... package substrate, SR ... encapsulating resin, x ... parabolic axis

Claims (5)

A thermally radioactive substrate;
A parabolic shaped cross-sectional shape is formed continuously in the longitudinal direction and is attached to the base on the top side of the parabola, and the heat conduction relationship to the base in the vicinity of the top side of the parabolic side of the parabolic surface. The module support substrate and the light-emitting portion are mounted on the module support substrate at a substantially focal point of the strip-shaped reflection surface and spaced apart from each other along the longitudinal direction of the strip-shaped reflection surface. A lighting unit comprising a plurality of LED modules for projecting a light beam directed to the facing area of the surface;
An LED lighting apparatus characterized by comprising:   The LED module includes an LED element, a lens, and a light control cylinder, and the lens arranges the light distribution of the light emitted from the LED element so that the amount of the light beam directed toward the frontal area of the belt-like reflecting surface is increased. The LED lighting apparatus according to claim 1, wherein the body suppresses direct light that deviates from the LED element toward the illumination space.   A plurality of lighting units are provided, and at least some of the lighting units have a strip-like reflecting surface arranged adjacent to each other in parallel, and the other lighting unit has a pair of adjacent lighting units on the back side of the LED module of the pair of lighting units. The LED lighting apparatus according to claim 1 or 2, wherein the back surfaces of the belt-like reflecting surfaces are opposed to each other.   The belt-like reflecting surface has a side edge portion extending outward from the opening end portion, and covers at least the module support substrate of the lighting unit adjacent to the side edge portion when viewed from the illumination space side. The LED lighting apparatus according to claim 3.   The plurality of lighting units are symmetrically arranged, and the LED modules are arranged so as to be divided into left and right to project the light beam and project outward, and are spaced apart from each other in the center. The LED lighting apparatus according to claim 3 or 4, wherein a gap is formed between the LED modules, and the gap is closed with a surface member.

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