JP2012256570A - Led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting fixture capable of lighting an irradiated face uniformly and having an excellent lighting performance.SOLUTION: The LED lighting fixture is provided with an LED unit 11 with a plurality of LEDs 11a etc. aligned in one direction and a reflection plate 3 arranged facing the LED unit 11 on an opposite side to an irradiated face. The light emitted from each of the LEDs 11a is reflected by the reflection plate 3 in mutually different directions to irradiate the irradiated face indirectly. In this construction, dazzling of a light source can be eliminated and the irradiated face can be lighted uniformly as well. Moreover, a problem of dots of LEDs 11a becoming conspicuous can be solved since this is indirect illumination using the reflection plate 3.

Description

  The present invention relates to a lighting fixture used for various types of lighting such as indoor lighting and in-vehicle lighting of a railway vehicle, and more particularly to an LED lighting fixture that uses an LED (Light-Emitting Diode) as a light source.

  2. Description of the Related Art Conventionally, lighting fixtures that use incandescent bulbs, fluorescent lamps, and the like as light sources are generally used as lighting fixtures that are used for interior lighting and interior lighting of railway vehicles. In recent years, LED lighting fixtures using LEDs as light sources have been put into practical use in place of incandescent bulbs and fluorescent lamps (see, for example, Patent Documents 1 to 3). As an example, an LED unit in which a plurality of LEDs are mounted on a substrate, an LED drive circuit, and the like are provided in the fixture body, and indoor illumination is performed by irradiating the irradiated surface with light emitted from each LED of the LED unit. There is a lighting fixture. According to the lighting fixture using such an LED, low power consumption, long life, light weight, and the like can be achieved.

JP 2011-054351 A JP 2009-016095 A JP 2003-124528 A

  By the way, in the conventional LED lighting fixture, the light emission surface (LED light emission surface) of the LED unit is directed to the irradiated surface side (lower side in the case of ceiling mounting), and the light from each LED is directed to the irradiated surface. A direct-illumination type lighting fixture is common. Here, since the directivity of the emitted light is strong in the LED, in the LED lighting apparatus (direct illumination method) using the LED as the light source, the light source may feel dazzling (glare), and the LED dots may be conspicuous. . Furthermore, the conventional LED lighting apparatus has a problem that it is difficult to uniformly illuminate the irradiated surface.

  The present invention has been made in consideration of such a situation, and an object thereof is to provide an LED lighting apparatus that can uniformly illuminate a surface to be irradiated and has good illumination performance.

  The lighting fixture of the present invention is an LED lighting fixture that uses LEDs as a light source, and an LED unit in which a plurality of LEDs that emit light to the opposite side of the irradiated surface are arranged along one direction, and the LED unit And a reflecting member (reflecting plate) that is disposed on the opposite side of the irradiated surface and reflects light emitted from the plurality of LEDs toward the irradiated surface.

  The reflecting member is a member whose reflecting surface extends in a uniform cross section along the arrangement direction of the plurality of LEDs, and the LED unit is disposed so as to face the central portion in the width direction. Furthermore, the reflection member has a central reflection surface that is concave on the LED unit side at the central portion in the width direction, and the light emitted from each LED is directed outward on both sides of the central reflection surface. An inner reflection surface that reflects and an outer reflection surface that reflects the light emitted from each LED toward the center side (the center side in the short direction (width direction)) of the lighting fixture are formed, It is configured to reflect light emitted from the LEDs in different directions. More specifically, the inner reflective surface is a convex curved surface (for example, a cylindrical convex surface) convex on the LED unit side, and the outer reflective surface is a concave curved surface reflective on the LED unit side. It is a surface (for example, cylindrical concave surface), It is characterized by the above-mentioned.

  According to the LED lighting apparatus of the present invention, the light emitted from each LED is reflected in different directions by the reflecting member and indirectly irradiated onto the irradiated surface, so that the glare of the light source is reduced. In addition, the irradiated surface can be illuminated uniformly. Moreover, since it is indirect illumination using a reflective member, the problem that the dot of LED stands out can also be eliminated.

  Furthermore, in the conventional LED lighting apparatus (direct lighting system), there was a problem that a plurality of shadows of the irradiated object could be seen, but in the LED lighting apparatus of the present invention, the emitted light of each LED is used as a reflecting member. Thus, since the light is reflected in different directions and irradiated on the surface to be irradiated, such a problem can be solved and the shadow of the object can be made one.

  As described above, according to the LED lighting apparatus of the present invention, it is possible to improve the illumination characteristics such as the light distribution, and it is possible to realize an illumination without a sense of incongruity similar to a lighting apparatus using a fluorescent lamp as a light source. .

  Here, in the LED lighting apparatus of the present invention, a radiation fin extending along the LED arrangement direction may be provided on the irradiated surface side (the opposite side of the LED light emitting surface) of the LED unit. If such a heat radiation fin is provided, in addition to the heat radiation effect of each LED of the LED unit, the heat radiation fin also functions as a reinforcing rib, so that the deformation of the long LED unit can be suppressed.

  According to the LED lighting apparatus of the present invention, the light emitted from the LED is reflected in different directions by the reflecting member and indirectly irradiated to the irradiated surface, so that the irradiated surface is made uniform. It is possible to illuminate, and the illumination performance can be improved.

It is a perspective view which shows an example of the LED lighting fixture of this invention. In addition, FIG. 1 is the figure which looked at the LED lighting fixture from diagonally downward. It is a perspective view which shows an example of the LED lighting fixture of this invention. In addition, FIG. 2 is the figure which looked at the LED lighting fixture from diagonally upward. It is a bottom view of the LED lighting fixture shown in FIG.1 and FIG.2. It is a side view of the LED lighting fixture shown in FIG.1 and FIG.2. It is AA sectional drawing of FIG. It is the elements on larger scale of FIG. It is a partial expansion perspective view of the LED lighting fixture shown in FIG.1 and FIG.2. In FIG. 7, the top plate is not shown. It is a figure which shows the dimension of each part of the LED unit used for the LED lighting fixture shown in FIG.1 and FIG.2, and a reflecting plate. It is a figure which shows the optical path of the reflected light reflected by the reflecting plate used for the LED lighting fixture shown in FIG.1 and FIG.2. It is sectional drawing which shows the other example of the LED lighting fixture of this invention. It is sectional drawing which shows another example of the LED lighting fixture of this invention.

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

  1-7 is a figure which shows an example of the LED lighting apparatus of this invention.

  The LED lighting fixture 100 of this example is a lighting fixture used for in-vehicle lighting of a railway vehicle, for example, and includes a light source unit 1, a fixture body 2, a reflector 3, a drive circuit unit 4, and the like.

  The light source unit 1 includes a light source holding member 10, an LED unit 11, a front transparent plate 12, and the like.

  The LED unit 11 includes a plurality of LEDs 11a,... 11a, a substrate 11b, and the like, and the plurality of LEDs 11a,... 11a are mounted on the substrate 11b along one direction. In this example, LEDs 11a... 11a are arranged in two rows. The arrangement pitch of the LEDs 11a in the two LED groups is the same, but the position of the LEDs 11a (position in the LED arrangement direction) of one LED row and the position of the LEDs 11a of the other LED row are only ½ pitch from each other. Each LED 11a is arranged (staggered arrangement) so as to be shifted.

  The substrate 11b is, for example, a general printed wiring board in which a predetermined conductor pattern is formed on the surface of a base material such as a glass fiber reinforced epoxy resin, or an aluminum base wiring board. The LED 11a, which is a light source, is a surface-mounted white LED and is mounted on the substrate 11b by surface mounting. The white LED may be, for example, a combination of a blue LED and a yellow phosphor (for example, a YAG phosphor) that emits yellow light by the output light (blue) of the blue LED element, or a blue LED element. Alternatively, a green LED element and a red LED element may be integrally molded with a resin, and a so-called 3-in-1 type multichip LED that emits white light by mixing these three colors of blue, green, and red may be used.

  The light source holding member 10 is a long member (for example, an aluminum member) that extends in a uniform cross section along one direction (LED arrangement direction), and is provided with an accommodation recess 10a that opens upward. The LED unit 11 is housed inside the housing recess 10a. The LED unit 11 is housed in the housing recess 10a with the light emitting surface of each LED 11a facing upward (opposite the surface to be irradiated). A plate-like front transparent plate (for example, made of resin or glass) 12 is disposed above the LED unit 11. The front transparent plate 12 covers the front side of the LED unit 11 (LEDs 11a... 11a), and is fitted in a support groove 10f formed on the inner surface of the housing recess 10a of the light source holding member 10.

  The lower side of the LED unit 11 in the light source holding member 10 is a solid heat sink part (heat radiating part) 10b, which can absorb and dissipate heat generated by each LED 11a of the LED unit 11. A plurality of (five) radiating fins 10c, 10d, and 10e are integrally formed on the heat sink portion 10b in order to increase the heat radiating efficiency. Each of the radiating fins 10c, 10d, and 10e is a rib-like member that extends along the longitudinal direction of the LED unit 11 (the arrangement direction of the LEDs 11a... 11a).

  On the other hand, the instrument body 2 is a metal member, for example, and includes a pair of side plates 21, 21, two top plates 22, 22, a pair of left and right side brackets 23, 23, a support plate 24, and an electric device housing. Part 25 and the like.

  The pair of side plates 21 and 21 are members extending along one direction (the arrangement direction of the LEDs 11a... 11a), and are disposed to face each other. A reflecting plate 3 to be described later is integrally provided at the lower ends of the pair of side plates 21 and 21. On the outer surface of each side plate 21, 21, a plurality of (five) reinforcing ribs 21b,... Extending in a semicircular cross section along the longitudinal direction of each side plate 21, 21 (the arrangement direction of the LEDs 11a,. 21b is formed.

  Support frames 21a and 21a are integrally provided on the inner surfaces of the side plates 21 and 21 at positions facing each other, and a support plate 24 is fitted into the support frames 21a and 21a. The support plate 24 extends over the entire length of the instrument main body 2 in the longitudinal direction, and an electric device accommodating portion 25 is attached to the upper surface of the central portion. The drive circuit unit 4 is accommodated in the electrical equipment accommodating portion 25. The drive circuit unit 4 incorporates an LED drive circuit, a dimming circuit, and the like.

  As shown in FIG. 2, the top plates 22, 22 are attached to the upper portions of the pair of side plates 21, 21, and the portions excluding the electric device housing portion 25 (the side plates 21, 21, the side bracket 23, and the support plate) The space surrounded by 14 etc.) is covered from above.

  The side brackets 23 and 23 are attached to the end portions of the instrument body 2. Each side bracket 23 is a member that covers each end of the instrument body 2 and supports both ends of the light source holding member 10.

  Each side bracket 23 is provided with a support recess 23a as shown in FIGS. A substantially upper half of the support recess 23a is a semicircular recess 203a, and a substantially lower half is processed into a shape corresponding to the longitudinal cross-sectional shape of the light source holding member 10 (the cross-sectional shape of the radiation fins 10c, 10d, and 10e). It is the recessed part 203b. And each side bracket 23 is attached to each edge part (each edge part of a pair of side plates 21 and 21), fitting each edge part of the light source holding member 10 in the support recessed part 23a of each side bracket 23. Thus, the light source holding member 10 (LED unit 11) can be held at a position below the central portion of the instrument body 2. In this holding state, as shown in FIGS. 5, 6, and 8, the center positions of the LEDs 11 a and 11 a of the two LED rows of the LED unit 11 are the center line (device center line) CL of the LED lighting device 100. To match.

  In the LED lighting apparatus 100 having the above configuration, the top plates 22 and 22 and the side brackets 23 and 23 are assembled to the side plates 21 and 21 by screwing with small screws or the like, respectively.

  Further, the wiring connection between the LED unit 11 and the drive circuit unit 4 accommodated in the electric equipment accommodating portion 25 is, for example, a wiring hole / wiring groove (not shown) in which the electric wire cord of the LED unit 11 is provided in the side bracket 23. ), Notch (not shown) provided at the end of the support plate 24, and the interior of the instrument body 2 (the space between the support plate 24 and the top plate 22), leading to the electrical device housing 25. What is necessary is just to carry out by the method of connecting to the drive circuit unit 4. Moreover, what is necessary is just to guide and connect an electric wire cord to the LED unit 11 by the same path | route, when performing wiring connection from the electric equipment accommodating part 25 (drive circuit unit 4) side.

  And the LED lighting fixture 100 of this example is used in the state which attached the instrument main body 2 to the ceiling board 200 in the vehicle of a railway vehicle (ceiling board direct attachment state), as shown in FIG. In attaching the LED lighting apparatus 100, the ceiling plate 200 of the railway vehicle is provided with a hole for penetrating the electric device housing portion 25, and the electric device housing portion 25 is disposed on the back side of the ceiling plate 200. .

-Reflector-
Next, details of the reflector 3 will be described with reference to FIGS. 5 and 7 to 9.

  In the LED lighting apparatus 100 of this example, the reflector 3 is disposed on the side opposite to the irradiated surface with respect to the LED unit 11, and the output light of each LED 11a of the LED unit 11 is irradiated on the irradiated surface side (lower side). ) Reflected toward).

  The reflection plate 3 is a member extending in a uniform cross section along the arrangement direction of the LEDs 11a... 11a, and is integrally provided at the lower ends of the side plates 21 and 21 of the instrument body 2 as described above. The cross-sectional shape of the reflection plate 3 (the cross-sectional shape of the reflection surface) is symmetrical with respect to the instrument center line CL (see FIG. 8). The reflection plate 3 includes a central reflection surface 31, inner reflection surfaces 32 and 32, and outer reflection surfaces 33 and 33.

  The central reflection surface 31 is provided at the central portion in the width direction (short direction) of the reflection plate 3. The central reflection surface 31 is a concave surface that is symmetrical with respect to the instrument center line CL, and is constituted by a pair of concave curved surfaces (cylindrical concave surfaces) 31a and 31a that are concave on the LED unit 11 side (lower side). . Inner reflecting surfaces 32 are formed on both sides (outer sides) of the central reflecting surface 31, respectively. Each inner reflective surface 32, 32 is a cylindrical reflective surface (convex curved reflective surface) convex toward the LED unit 11. Outer reflecting surfaces 33 are formed outside the inner reflecting surfaces 32, 32, respectively. Each of the outer reflective concave curved surfaces 33 and 33 is a cylindrical reflective surface (concave curved reflective surface) having a concave shape on the LED unit 11 side.

  According to the reflecting plate 3 having such a configuration, as shown in FIG. 9, a part of light from each LED 11a (in a direction along the instrument center line CL) by the pair of concave curved surfaces 31a, 31a of the central reflecting surface 31. Light traveling) can be reflected toward the outside (both sides of the LED lighting apparatus 100). Moreover, the light (LED output light) incident on the inner reflection surfaces 32 and 32 can be reflected toward the outside (both sides of the LED lighting apparatus 100). Furthermore, the light (LED output light) incident on the outer reflective concave curved surfaces 33, 33 can be reflected toward the inner side (center side of the LED lighting device 100 (device center line CL side)).

  In addition, it is preferable that the color of the reflective surface (reflective surfaces 31, 32, 33) of the reflective plate 3 is a color that can efficiently reflect the output light of each LED 11a, for example, white.

And in LED lighting fixture 100 of this example, the dimension of each following part shown in Drawing 8 (1) Center distance d of LED11a of 2 rows
(2) Height of the central portion of the reflector 3 with respect to the LED 11a (height of the boundary portion S1) H1
(3) Curvature radius of the pair of concave curved surfaces 31a, 31a of the central reflecting surface 31 (curvature radius of the cylindrical concave surface)
(4) Height (depth) H2 of the central reflecting surface 31
(5) Height H3 of the lower end S3 of the outer reflective surface 33 with respect to the LED 11a
(6) Distance L1 between the boundary portions S1 between the central reflection surface 31 and the inner reflection surface 32 (distance [L1 / 2] of each boundary portion S1 with respect to the instrument center line CL)
(7) Curvature radius of inner reflective surfaces 32, 32 (curvature radius of cylindrical convex surface)
(8) Distance L2 between the boundary portions S2 between the inner reflection surface 32 and the outer reflection surface 33 (distance [L2 / 2] of each boundary portion S2 with respect to the instrument center line CL)
(9) Curvature radius of outer reflective surface 33 (curvature radius of cylindrical concave surface)
(10) Distance L3 between the lower end portions S3 of the two outer reflection surfaces 33 (distance of each lower end portion S3 with respect to the instrument center line CL [L3 / 2])
Are adapted so that the light emitted from each LED 11a is reflected by the reflector 3 in different directions, that is, the optical path of the reflected light reflected by the reflector 3 as shown in FIG. It is characterized in that the distribution is made uniform.

  As described above, according to the LED lighting apparatus 100 of this example, the light emitted from each LED 11a is reflected by the reflector 3 in different directions and indirectly irradiated onto the irradiated surface. Further, the surface to be irradiated can be illuminated uniformly. Moreover, since it is indirect illumination using the reflecting plate 3, the problem that the dot of LED11a is conspicuous can also be eliminated.

  Furthermore, in the conventional LED lighting apparatus (direct lighting system), there is a problem that a plurality of shadows of the irradiated object can be seen, but in the LED lighting apparatus 100 of this example, the emitted light of each LED 11a is reflected on the reflector. 3, the surface to be irradiated is reflected in mutually different directions, so that such a problem is solved and the shadow of the object can be made one. In addition, as shown in FIG. 9, a part of the output light of each LED 11a goes to the ceiling surface in the room, so that the ceiling surface can be illuminated.

  As described above, according to the LED lighting apparatus 100 of this example, it is possible to improve the lighting characteristics such as light distribution, and it is possible to realize an illumination without a sense of incongruity similar to a lighting apparatus using a fluorescent lamp as a light source. .

  Moreover, in the LED lighting fixture 100 of this example, since the center part reflective surface (concave surface) 31 is provided in the center part of the reflecting plate 3, ie, the part where each LED 11a of the LED unit 11 is opposed, as shown in FIG. The optical path angle of the reflected light reflected by the reflecting plate 3 (the optical axis angle of the reflected light) can be increased, and the illumination area can be expanded.

  Furthermore, in the LED lighting apparatus 100 of this example, the light source holding member 10 that holds the LED unit 11 is provided with a plurality of heat radiation fins 10c, 10d, and 10e extending along the longitudinal direction of the LED unit 11. The heat generated by each of the 11 LEDs 11a can be efficiently radiated. Moreover, in addition to the heat radiation effect, the heat radiation fins 10c, 10d, and 10e also function as reinforcing ribs, so that it is possible to suppress the deformation of the long LED unit 11 (light source holding member 10).

  In the LED lighting apparatus 100 having the above-described configuration, the light source holding member 10 is attached to the support plate 24 at the center of the apparatus main body 2 in order to increase the rigidity of the light source holding member 10 (LED unit 11) which is a long body. A support stay may be provided to support.

-Other embodiments-
In the above example, the ceiling surface direct attachment type LED lighting apparatus has been described, but the present invention is not limited to this.

  For example, as shown in FIG. 10, an LED lighting apparatus having a structure (ceiling embedded type) in which the reflecting plate 3 is directly attached to the ceiling plate 200 may be used. Moreover, as shown in FIG. 11, the LED lighting fixture of the structure (ceiling board integrated type) which integrally formed the reflecting plate 3 in the ceiling board 300 itself may be sufficient. 10 and 11, the reflecting surface of the reflecting plate 10 (the central reflecting surface 31, the inner reflecting surfaces 32 and 32, and the outer reflecting surfaces 33 and 33) and the light source 1 (light source holding). The members 10) and the like have basically the same structure as the above-described embodiment.

  In the above example, the number of LED groups constituting the LED unit 11 is two, but the number of LED groups may be one or three or more without being limited to this.

  In the above example, the LED lighting apparatus using the surface mount type LED has been described. However, the present invention is not limited to this, and for example, the light emitting element arranged on the lead frame is made of a covering member such as glass or resin. You may comprise an LED lighting fixture using the bullet-shaped LED formed by molding.

  INDUSTRIAL APPLICABILITY The present invention can be used for lighting fixtures used for various types of lighting such as indoor lighting and interior lighting of railway vehicles, and more specifically, can be effectively used for LED lighting fixtures using LEDs as light sources.

DESCRIPTION OF SYMBOLS 100 LED lighting fixture 1 Light source part 10 Light source holding member 10b Heat sink part 10c, 10d, 10e Radiation fin 11 LED unit 11a LED
11b Substrate 12 Front glass 2 Instrument body 21 Side plate 22 Top plate 23 Side bracket 23a Support recess 24 Support plate 3 Reflector 31 Central reflection surface 31a Concave surface 32 Inner reflection surface 33 Outer reflection surface

Claims (3)

A luminaire using LEDs as a light source,
An LED unit in which a plurality of LEDs emitting light to the opposite side to the irradiated surface are arranged along one direction, and the LED unit is disposed on the opposite side to the irradiated surface, and from the plurality of LEDs A reflecting member that reflects the emitted light toward the irradiated surface;
The reflecting member is a member whose reflecting surface extends in a uniform cross section along the arrangement direction of the plurality of LEDs, and the LED unit is disposed so as to face the central portion in the width direction, The reflection member has a central reflection surface that is concave on the LED unit side at the central portion in the width direction, and the inner side that reflects the light emitted from each LED toward the outside on both sides of the central reflection surface, respectively. A reflecting surface and an outer reflecting surface that reflects the light emitted from each LED toward the center side of the lighting fixture are formed, so that the light emitted from each LED is reflected in different directions. An LED luminaire characterized by being configured. The LED lighting apparatus according to claim 1,
The LED lighting fixture according to claim 1, wherein the inner reflecting surface is a convex curved reflecting surface convex on the LED unit side, and the outer reflecting surface is a concave curved reflecting surface concave on the LED unit side. The LED lighting apparatus according to claim 1 or 2,
An LED lighting apparatus, wherein a radiation fin extending along an arrangement direction of the plurality of LEDs is provided on an irradiated surface side of the LED unit.

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