JP2008103300A - Led module, and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED module suitable for distributing light in a wide range despite its compactness, excelling in light extraction efficiency, and easily keeping the efficiency. <P>SOLUTION: A plurality of LEDs 13 are mounted on an LED arrangement member 14 at certain intervals. A plurality of light distribution-controlling lenses 16 distributing the light emitted from the LEDs in a predetermined direction is arranged on the LED mounting surface of the arrangement member 14 to set its light emitting surfaces 16a in parallel to the LED mounting surface. Each lens 16 includes: a flat light emitting surface 16a without irregularity; a recessed part 16b formed on the side opposite to the surface 16 by being recessed toward the light emitting surface to individually house the LED 13; a convex lens part 16f forming the back surface of the recessed part, and projecting toward an open end of the recessed part 16b; and a reflecting surface 16c connecting the open end of the recessed part 16b to the light emitting surface 16a, and reflecting the light emitted from the LED 13 toward the light emitting surface 16a. This LED module is characterized in that, for at least one lens 16 within the respective lenses, a lens formed into an asymmetrical shape where the center axis line X of the convex lens part 16f of the lens is made to intersect with the optical axis Y of the LED 13 is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an LED module including a plurality of light source elements, each of which is formed of an LED (light emitting diode), and a wall washer, a blackboard lamp, a street light, a security light, and the like including the LED module as a light source unit. It relates to lighting equipment.

  2. Description of the Related Art Conventionally, lighting devices such as wall washers that use a plurality of LED modules as a light source unit and are installed on, for example, a ceiling surface and illuminate vertical wall surfaces are known (for example, see Patent Document 1).

  In the technique of this patent document 1, each LED module is formed by fixing a plurality of LEDs having the same beam angle in the longitudinal direction of this plate to a long plate-like mounting plate. Then, LEDs having different beam angles are used in the relationship between the LED modules. Further, the mounting plate of each LED module is screwed to an instrument body that is installed by embedding both bent end portions in the ceiling surface. The mounting angles of the mounting plates are different from each other, whereby the angle formed by the optical axis of the LED and a surface perpendicular to the irradiation surface is different for each LED module.

  As described above, in the technique of Patent Document 1, required light distribution characteristics with respect to the irradiation surface are obtained by making the mounting angle and beam angle of each LED module different from each other.

Also, a technology in which a sawtooth structure is provided on the exit surface of the lens in order to deflect the emitted light of the LED module containing the LED in the recess of the axisymmetric bowl-shaped collimator lens with respect to the symmetry axis of the lens, Also, there is known a lighting fixture in which a plurality of collimator lenses are used to orient the sawtooth structure of each collimator lens so that a desired irradiation pattern is formed (see, for example, Patent Document 2).
JP 2004-247147 A (paragraphs 0020-0031, FIGS. 1 to 5) Japanese translation of PCT publication No. 2002-528861 (0012-0018, FIG. 1 to FIG. 5)

  For example, the light distribution required for lighting fixtures typified by a wall washer is rarely a simple light distribution that is rotationally symmetric (axisymmetric) with respect to the optical axis of the LED used in the light source section, In many cases, significant asymmetric light distribution is required.

  For this reason, it is customary to design lenses, reflectors, prism covers, etc., which are light distribution control members, so as to match the required light distribution for each model of lighting fixture. It is not an exception. Specifically, in the luminaire of Patent Document 1, the required light distribution is obtained by selecting the mounting angles for each of the mounting plates that support the plurality of LEDs so as to match at least the required light distribution. . Therefore, much labor is required in manufacturing including the design stage.

  In addition, it is disadvantageous when the lighting fixture is made thin because a large installation space for the mounting plate is required in the thickness direction as the mounting angle is selected for each mounting plate. Furthermore, if the mounting plates that support the plurality of LEDs are arranged apart from each other, it is possible to illuminate a wide range, but naturally the horizontal space for arranging the plurality of mounting plates also increases. This is disadvantageous when making the instrument compact.

  Further, a sawtooth structure for controlling light distribution is arranged by changing the direction of each collimator lens (light distribution control member) formed on the light emitting surface so that a desired irradiation pattern is formed. The technique disclosed in Patent Document 2 is excellent in that the LED module is compact. However, most of the light emitted from the LED is reflected by the curved outer surface of the lens and then refracted largely by the light emitting surface of the sawtooth structure and emitted to the outside. Since the loss associated with such twice light control is inevitable, the light extraction efficiency is not good. In particular, as the angle of light refraction at each individual prism that forms a sawtooth structure increases, as in the case of illuminating a wider area, the loss of light in the sawtooth structure increases, so the wide area is illuminated. It is not preferable to. Furthermore, since the sawtooth structure is formed on the light exit surface of the lens, it is easy to get dust on the light exit surface and it is not easy to remove the attached dust. The light extraction efficiency tends to decrease.

  An object of the present invention is to provide an LED module and a luminaire that are compact and suitable for light distribution over a wide range, and that have good light extraction efficiency and can easily maintain this efficiency.

  The LED module of the invention according to claim 1 includes a plurality of LEDs; an LED arrangement member on which the LEDs are mounted at intervals; a flat light emitting surface having no irregularities; and the light on the side opposite to the light emitting surface. A concave portion that is recessed toward the emission surface, a convex lens portion that forms a back surface of the concave portion and protrudes toward an open end of the concave portion, and an open end of the concave portion and the light emission surface are connected to each other. The light emitting surface is formed with a reflecting surface that reflects light emitted from the LED toward the light emitting surface, and the LEDs are individually accommodated in the recesses on the LED mounting surface of the LED mounting member. A plurality of light distribution control lenses that are arranged in parallel with the LED mounting surface and distribute light emitted from the LEDs in a predetermined direction; and at least one of the plurality of lenses The lens is its convex lens The central axis by intersecting the optical axis of the LED, is characterized in that it is formed asymmetrically with respect to the optical axis.

  In the present invention and each of the following inventions, a plurality of LEDs (light-emitting diodes) are selected from at least one of a red LED, a blue LED, a green LED, and a white LED according to a desired light distribution color. Can be used. As the white LED, a white LED that realizes white light emission by combining a red LED element, a blue LED element, and a green LED element can be used. In addition to this, for example, fluorescence that absorbs blue light and emits yellow fluorescence. It is also possible to use a white LED that realizes white light emission by combining a substance with a blue LED element. The LED may be an SMD (surface mount device) type formed in a chip shape.

  In this invention and each of the following inventions, for example, a printed wiring board can be representatively exemplified as an LED arrangement member on which an LED is surface-mounted. In this invention and each of the following inventions, the light distribution control lens has higher light use efficiency than the reflector, and can be formed of glass, a light-transmitting synthetic resin, or the like. Furthermore, in this invention and each of the following inventions, at least one of the plurality of lenses is different from the light distribution characteristics of the other lenses. In the present invention and each of the following inventions, the reflecting surface of the lens is preferably a total reflection surface that totally reflects light incident thereon, but is not limited thereto.

  When the lighting fixture of the invention of claim 1 is turned on, the light emitted from each LED is controlled by a light distribution control lens that individually covers each LED, and is distributed in a required direction. Thereby, the required light distribution by the synthetic | combination light of the light distribution radiate | emitted from each lens can be given to an irradiation surface. At least one of the plurality of lenses responsible for the light distribution has an asymmetric shape with respect to the optical axis of the LED, and the central axis of the convex lens portion intersects the optical axis of the LED. It is possible to emit LED light in the direction in which the central axis extends. As a result, the light emitted from the lens can be distributed in a direction shifted from the direction in which the optical axis of the LED extends, so that a wide range can be illuminated with the light emitted from these LEDs even if the interval between the plurality of LEDs is narrow. . And since it provided the asymmetrical lens as mentioned above in order to perform such illumination, the device which adapts the mounting attitude | position of an LED module to the said wide range illumination is not required. Therefore, this LED module is compact, and the arrangement space in the horizontal direction and the thickness direction can be reduced.

  Furthermore, since the LED module of the invention of claim 1 includes a lens having an asymmetric shape enabling a wide range of illumination as described above, the light emitted from each LED is distributed in a predetermined direction. In addition, the light emission surfaces of the plurality of light distribution control lenses do not need to have a sawtooth shape, and can be formed as a flat surface without irregularities. For this reason, the loss of light on the light exit surface is suppressed, the light extraction efficiency is increased, dust is less likely to adhere to the light exit surface, and the attached dust can be easily removed. It is easy to maintain the removal efficiency.

  An LED module according to a second aspect of the present invention includes a plurality of LEDs; an LED arrangement member in which these LEDs are mounted at intervals; and each of the LEDs disposed inside and disposed on the LED mounting surface of the LED arrangement member A plurality of holders having a circular or regular polygonal support centered on the housed LED; a flat light emitting surface having no irregularities, and facing the light emitting surface on the side opposite to the light emitting surface A concave portion provided in a depression, a convex lens portion that forms the inner surface of the concave portion and protrudes toward the open end of the concave portion, and the open end of the concave portion and the light emitting surface are connected to be emitted from the LED. It is formed with a reflecting surface that reflects light toward the light emitting surface, and the LEDs are individually housed in the recesses, and the light emitting surface is parallel to the LED mounting surface and is supported on the support portion of the holder. Each supported, A plurality of light distribution control lenses that distribute light emitted from the LEDs in a predetermined direction; and at least one of the plurality of lenses is attached to the holder that supports the lens, It is provided so as to be movable around a vertical line with respect to the LED arrangement member, and is formed in an asymmetric shape with respect to the optical axis by intersecting the central axis of the convex lens portion with the optical axis of the LED. It is a feature.

  In the second aspect of the present invention, when the support portion of the holder is a regular polygon, the polygonal shape includes a regular hexagon, a regular square, and the like. Further, as the number of corners increases, the position adjustment of the optical axis becomes finer. It is preferable in that it can be performed.

  In the invention of claim 2, when each LED is turned on, the light emitted therefrom is controlled by each lens supported by each holder and is distributed in a required direction. At least one of the plurality of lenses responsible for the light distribution can change the relative position with the support portion of the holder.

  The at least one lens is formed in an asymmetric shape in which the central axis of the convex lens portion intersects with the optical axis of the LED covered by the lens. Therefore, the lens with respect to the holder is rotated by rotating the lens around the optical axis. The direction of light distribution by the at least one lens can be adjusted by changing the relative position. In the adjustment of the direction of light distribution, when the support portion is circular, the lens can be adjusted steplessly by rotating the lens around the optical axis of the LED covered by the support portion, and the support portion is polygonal. In some cases, the lens can be adjusted by moving the lens around the optical axis of the LED covered by the angle divided by 360 ° by the number of angles. As described above, as the direction of the light distribution by the at least one lens is adjusted, a required light distribution by the combined light of the light distribution emitted from each lens can be given to the irradiation surface.

  As described above, the LED module according to the second aspect of the invention can also distribute the light emitted from the lens by shifting it from the direction in which the optical axis of the LED extends. A wide range can be illuminated with the light emitted from. And since it provided the asymmetrical lens as mentioned above in order to perform such illumination, the device which adapts the mounting attitude | position of an LED module to the said wide range illumination is not required. Therefore, this LED module is compact, and the arrangement space in the horizontal direction and the thickness direction can be reduced.

  Furthermore, the LED module of the invention of claim 2 also includes an asymmetrical lens that enables a wide range of illumination as described above, so that the light emitted from each LED is distributed in a predetermined direction. Therefore, the light emission surfaces of the plurality of light distribution control lenses do not need to have a sawtooth shape, and can be formed as a flat surface without irregularities. For this reason, the loss of light on the light exit surface is suppressed, the light extraction efficiency is increased, dust is less likely to adhere to the light exit surface, and the attached dust can be easily removed. It is easy to maintain the removal efficiency.

  An LED module according to a third aspect of the invention is characterized in that the LED disposing member is made of a flat plate having a metal base from which heat of the LED is released.

  In this invention of Claim 3, since the heat | fever which each of several LED mounted in the LED arrangement | positioning member emits at the time of lighting can be discharge | released to an LED arrangement | positioning member, the temperature rise of each LED can be suppressed. In addition, since the LED arrangement member does not face various directions for each irradiation direction and is a simple flat plate, when connecting to a heat dissipation member for releasing heat from the outside, the connection becomes easy and heat dissipation is achieved. Heat transfer to the member can be made smooth.

  A lighting fixture according to a fourth aspect of the present invention is formed using at least one LED module according to any one of claims 1 to 3 and mounted on the fixture main body. And a light source unit that distributes light through the irradiation opening.

  The invention of claim 4 is provided with the LED module according to any one of claims 1 to 3 as a light source part, and is therefore suitable for light distribution over a wide range while being compact. Therefore, it is possible to provide a lighting apparatus that can easily maintain the efficiency.

  According to the first and second aspects of the present invention, it is possible to provide an LED module that is compact and suitable for light distribution over a wide range, and that has good light extraction efficiency and can easily maintain this efficiency.

  According to the invention of claim 3, the temperature rise of each LED can be suppressed, and when connecting to the heat radiating member for releasing heat from the LED mounting member to the outside, this connection is easy, An LED module with smooth heat transfer can be provided.

  According to the fourth aspect of the present invention, it is possible to provide a lighting apparatus that is compact and suitable for distributing light over a wide range, and that has good light extraction efficiency and can easily maintain this efficiency.

  A first embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIG. 1 denotes a lighting fixture that functions as a wall washer. This luminaire 1 is embedded in a ceiling surface 2 and illuminates an irradiation surface 3 such as a vertical wall surface.

  As shown in FIGS. 2 and 3, the lighting fixture 1 includes a metallic fixture body 5 and a light source unit 11 built in the fixture body 5. The instrument body 5 includes a side wall 6 having a rectangular tube shape. The upper end of the side wall 6 is closed by the top wall 7. The lower end of the side wall 6 is opened as an irradiation opening 5a. A flange 8 is formed at the lower end of the side wall 6 so as to be bent outward by being bent. The flange 8 surrounds the irradiation opening 5a. The flange 8 is brought into contact with the ceiling surface 2 from below in a state where the lighting fixture 1 is embedded and installed in the ceiling surface.

  As shown in FIG. 3, for example, a module support plate 9 is attached as a heat radiating member in the instrument body 5. The module support plate 9 is made of metal, and is screwed with one end portion 9a being in surface contact with the inner surface of the side wall 6 and screwed with the other end portion 9b being in surface contact with the inner surface of the top plate wall 7. Yes. Therefore, the module support plate 9 is mounted on the instrument body 5 so that heat conduction can be satisfactorily performed. The intermediate part between the one end part 9a and the other end part 9b of the module support plate 9 is, for example, oblique.

  The light source unit 11 is composed of one or more, preferably a plurality of LED modules 12. In this embodiment, as shown in FIG. 2, four LED modules are used to obtain the amount of light that irradiates the irradiation surface 3 with a required brightness. 12 is used. These LED modules 12 are mounted on the intermediate portion of the module support plate 9 which is inclined by screwing or the like, and are provided to face the irradiation opening 5a.

  As shown in FIGS. 4 and 5, each LED module 12 includes a plurality of SMD LEDs 13 in a chip shape, an LED arrangement member 14, a plurality of holders 15, and a plurality of light distribution control members. And a control lens 16.

  Each LED 13 is, for example, one that emits light of the same color, preferably white. Each LED 13 forms a light emitting portion. In the present embodiment, the light emitting portion is formed by the LED 13 that emits a single white light as described above, but for one or a plurality of colored LEDs other than white. The light emitting part may be used.

  The LED arrangement member 14 is preferably formed of a printed wiring board that is a flat plate, and functions as a module substrate. As shown in FIG. 4A, the LED disposing member 14 has, for example, a rectangular shape in plan view. As a preferred example, as shown in FIG. 5B, the LED disposing member 14 is formed by laminating a considerably thinner insulating layer 14b on one surface of a metal base 14a, and further forming a predetermined pattern with a conductor (not shown) on the insulating layer 14b. Provided. The metal base 14a is made of a metal material having excellent thermal conductivity, for example, Al or copper. The conductor is provided by an etching process or the like.

  As shown in FIGS. 4A and 4B, each LED 13 is mounted on the LED disposing member 14. These LEDs 13 are fixed on the insulating layer 14b by an adhesive (not shown), and are provided at intervals, that is, at a predetermined interval so as not to interfere with the arrangement of the lenses 16. Yes. Each LED 13 and the conductor (not shown) are connected by a bonding wire (not shown).

  The same number of holders 15 as the plurality of LEDs 13 are used. As shown in FIGS. 4 and 5, each holder 15 has a cylindrical shape whose upper and lower ends are open. For example, a pair of holder elements 15a integrally formed in a semicylindrical shape with a synthetic resin is combined into a cylindrical shape. It has been. As shown in FIGS. 5A and 5B, a semicircular groove that opens to the inner periphery is formed at one end of the pair of holder elements 15a. These grooves are combined with each other to form a circular support portion 15b by combining a pair of holder elements 15a.

  The same number of light distribution control lenses 16 as the plurality of LEDs 13 are used. These lenses 16 are integrally molded products made of a transparent material such as a transparent acrylic resin. As shown in FIG. 5B, the lens 16 has a light emitting surface 16a, a concave portion 16b, a reflective surface 16c, a mounting flange 16d, a rotation operation portion 16e, and a convex lens portion 16f. Yes.

  The light emitting surface 16a is a surface that forms the front surface of the lens 16, and is made of a flat surface that has no irregularities. By making the light emitting surface 16a flat as described above, it becomes difficult for dust to adhere to the light emitting surface 16a, and the attached dust can be easily removed, and the light extraction efficiency can be easily maintained. The concave portion 16b is formed to be recessed toward the light emitting surface 16a on the side opposite to the light emitting surface 16a (the back side of the lens 16), and is open to the back side of the lens 16. The inner surface of the recess 16b is formed by a convex lens portion 16f that protrudes toward the open end of the recess 16b. The reflecting surface 16c is formed so as to extend between the open end of the recess 16b and the light emitting surface 16a. The reflecting surface 16c is, for example, a total reflecting surface.

  The recess 16b is made of, for example, a cylindrical surface. The central axes X of the concave portion 16b and the convex lens portion 16f are, for example, the same and obliquely intersect the optical axis Y of the LED 13 disposed in the concave portion 16b. The central axis X is also the central axis of the lens 16. Therefore, the lens 16 is formed in a shape in which the reflection surface 16 c is asymmetric with respect to the optical axis X of the LED 13. The light emitting surface 16a is not formed by a surface orthogonal to the central axis X, but is obliquely intersected and formed by a flat surface orthogonal to the optical axis Y of the LED 13.

  A portion substantially surrounded by the light emitting surface 16a, the concave portion 16b, and the reflecting surface 16c forms a light control unit 16g. The mounting flange 16d projects outward from the light control unit 16g, specifically, from the reflection surface 16c continuously to the reflection surface 16c. As shown in FIG. 5A, the outer periphery of the mounting flange 16d has the same shape as the support portion 15b, that is, a circular shape. The outer periphery of the mounting flange 16d is a circle drawn with a radius centered on the optical axis Y of the LED 13, and is asymmetric with respect to the central axis X. As shown in FIG. 5B, the surface of the mounting flange 16d is continuous with the light emitting surface 16a without forming a step. This configuration is preferable in that dust does not easily adhere to the surface of the lens 16, and is preferable in that the mounting flange 16d can prevent the reflection of light from the reflection surface 16c.

  A rotation operation portion 16e is provided on the mounting flange 16d where the light reflected by the reflecting surface 16c is not incident. As shown in FIGS. 5A and 5B, the rotation operation portion 16e may be provided at a portion where the protrusion width of the mounting flange 16d with respect to the light control portion 16g is the largest, whereby the rotation operation portion 16e can be formed larger. Although the rotation operation part 16e consists of a convex part in this embodiment, it can replace with this and can also be formed with a recessed part.

  The lens 16 having the above-described configuration is attached to the inside of the holder 15 by fitting its mounting flange 16d to the support portion 15b. In this mounted state, the lens 16 can be rotated by sliding the mounting flange 16d on the support portion 15b, and the rotation operation portion 16e is positioned inside the support portion 15 so as not to interfere with the support portion 15b. As described above, the lens 16 is rotatable, but unless a rotational operation force of a predetermined size or more is given to the rotation operation portion 16e due to frictional resistance between the mounting flange 16d and the support portion 15b that are in contact with each other. , Provided to maintain a stationary state.

  Each holder 15 on which the lens 16 is rotatably supported in this way accommodates the LED 13 which is a light emitting portion inside, and the LED 13 is disposed in the concave portion 16b of the lens 16 and is illustrated in the LED arrangement member 14. The LED module 12 is assembled by fixing with screws that are not used. This assembled state is shown in FIG. The optical axis of the LED 13 indicated by the symbol Y in FIG. 5B is a vertical line passing through the center axis of the holder 15 among the vertical lines with respect to the LED mounting member 14, in other words, a vertical line passing through the center of the circle describing the circular mounting flange 16d. The lens 16 is rotatable about the optical axis Y. The central axis X forming the optical axis of the lens 16 with the above-described configuration intersects the optical axis Y of the LED as described above. This intersecting angle is indicated by θ in FIG.

  In the present embodiment, the same lens is used for all the lenses 16, but at least one lens 16 having the above-described configuration shown in FIGS. 5A and 5B may be used, and other lenses may be used. May be. Examples of other lenses include those shown in FIG. 6 and those shown in FIG.

  In the other lens 26 shown in FIG. 6, the optical axis Y of the concave axis 16b and the central axis X of the convex lens part 16f and the optical axis Y of the LED 13 arranged in the concave part 16b (not shown in FIG. 6) are the same. Accordingly, the lens 16 has the same configuration as that of the lens 16 except that the reflection surface 16c is formed symmetrically with respect to the optical axis Y of the LED 13. The other lens 26 is used by providing the central axis X of the concave portion 16b and the convex lens portion 16f, which are optical axes thereof, in parallel with a perpendicular to the LED arrangement member 14 (not shown in FIG. 6). In addition, light can be emitted from the light emitting surface 16a along the direction in which the optical axis Y of the LED 13 extends to distribute light in a predetermined direction.

  In the other lens 36 shown in FIG. 7, the reflecting surface 16c is made asymmetric with respect to the central axis X of the concave portion 16b and the convex lens portion 16f, which are optical axes thereof. The lens 16 has the same configuration as that of the lens 16 except that the curvature is larger than that of the lens 16c. Therefore, in the other lens 36, the central axis X of the concave portion 16b and the convex lens portion 16f, which are optical axes thereof, is perpendicular to the LED disposing member 14 not shown in FIG. 7 and the optical axis of the LED 13 not shown in FIG. The light is emitted from the light emitting surface 16a along the direction in which the optical axis X of the LED 13 extends, and is arranged in a predetermined direction different from the direction in which the optical axis Y of the LED 13 extends. Can shine. In this case, since the reflecting surface 16c having a curvature different from that of the reflecting surface 16c of the lens 16 having the above-described configuration is provided, light can be distributed with a beam angle corresponding to the reflecting surface 16c. Is different from the beam angle θ.

  Each assembled LED module 12 has its LED arrangement member 14 arranged on the module support plate 9 of the instrument body 5 and fixed by screwing or the like to form the light source unit 11. By fixing to the module support plate 9, the back surface of the metal base 14 a where the LED 13 is not mounted is in surface contact with the module support plate 9. Thereby, the metal base 14a of the LED module 12 is thermally conductively connected to the metal instrument body 5. Moreover, the light emission surface 16a of the lens 16 with which each LED module 12 was equipped is opposed to the irradiation opening 5a of the instrument main body 5 by the above attachment.

  In manufacturing the LED module 12, each lens 16 can be rotated by an appropriate angle in the assembled state of the LED module 12 in accordance with the specifications of the lighting fixture 1 in which the LED module 12 is incorporated. The rotation of the lens 16 is performed by applying an external force to the rotation operation unit 16e. In this case, the central axis X of the concave portion 16b and the convex lens portion 16f, which are the optical axes of the lenses 16, intersects the optical axis Y of the LED 13 parallel to the perpendicular to the LED mounting member 14 on which the LED 13 is mounted, rather than in parallel. Therefore, the lens 16 is rotated around the optical axis Y, and the relative position of the lens 16 with respect to the holder 15 changes.

  As the relative position changes, the central axis X of the concave portion 16b and the convex lens portion 16f, which are optical axes of the lens 16, moves around the optical axis Y of the LED 13, and the position of the central axis X with respect to the optical axis Y changes. The direction of the light emitted along the direction in which the central axis X of the concave portion 16b and the convex lens portion 16f that are the optical axes of the lens 16 extends, that is, the light distribution controlled by the lens 16 can be adjusted. FIG. 4A shows, as an extreme example for ease of understanding, a case where the position of the optical axis X of the adjacent lens 16 is adjusted to be different by 45 ° or 90 °.

  Further, when the lens 16 is rotated and moved as described above to adjust the position of the central axis X of the concave portion 16b and the convex lens portion 16f which are optical axes of the lens 16, the position of the rotation operation portion 16e can be used as a guide. . As a result, it is possible to know how the rotational position of each lens 16 has been adjusted, so that adjustment is easy.

  The LED module 12 in which the positions of the central axis X of the concave portion 16b and the convex lens portion 16f, which are the optical axes of the lens 16, are adjusted, is incorporated into the fixture body 5. Therefore, by lighting each LED 13 of each LED module 12 by a lighting device (not shown) provided in the fixture body 5, the lighting fixture 1 emits from each lens 16 whose light distribution direction has been adjusted as described above. Then, the combined light of the light distribution passing through the illumination opening 5a can be given to the irradiation surface 3 as a required light distribution.

  In addition, when the LED module 12 includes the other lens 26 shown in FIG. 6 and the further other lens 36 shown in FIG. 7 as a part of the light distribution control member, the light distribution emitted from these lenses 26 The required light distribution by the combined light can be obtained. The lens 36 shown in FIG. 7 is different from that shown in FIG. 5 in the beam angle emitted from the light exit surface 16a. Therefore, when the LED module 12 includes the lens 36 in part, In addition to adjusting the position of the central axis X of the concave portion 16b and the convex lens portion 16f, which are the optical axes of the lens 16, light distribution with different beam angles can be taken into account, thereby obtaining the required light distribution.

  As described above, the LED module 12 can adjust the direction of light distribution by adjusting the position of the central axis X of the concave portion 16b and the convex lens portion 16f, which are the optical axes of the lenses 16, and therefore the lighting fixtures 1 having different light distribution specifications. The light source unit 11 can be used. That is, it has high versatility. Further, the rotation position of the lens 16 can be adjusted unless the lens 16 of the LED module 12 incorporated in the lighting fixture 1 is positively stopped with an adhesive or the like. Therefore, when adjustment at the time of manufacture is inadequate, a required light distribution is given by finely adjusting the position of the optical axis X of each lens 16 of the LED module 12 at the construction site of the lighting fixture 1. Therefore, the adaptability to the situation at the installation site can be improved.

  In the technique of Patent Document 1, since the optical axis of the light distribution control element is preset according to the required light distribution, the direction of the light distribution is determined when manufacturing the lighting fixture or when installing the lighting fixture. It is difficult to adjust the position of the optical axis in order to change the position unless a modification that changes the mounting angle of the mounting plate is involved. For this reason, the LED module included in the lighting fixture of Patent Document 1 cannot cope with the need for position adjustment of the optical axis, and has low versatility with respect to various lighting fixtures. Furthermore, even in the technique of Patent Document 2 in which a plurality of collimator lenses (light distribution control members) are arranged by orienting a sawtooth structure so that a desired irradiation pattern is formed, the arrangement of each collimator lens is a lighting fixture. There is no change in being preset for each model so as to match the required light distribution. For this reason, it is difficult to adjust the position of the optical axis in order to change the direction of light distribution when manufacturing the lighting fixture or when installing the lighting fixture. The LED module included in is not compatible with the case where the position of the optical axis needs to be adjusted, and has low versatility with respect to various lighting fixtures.

  Further, as described above, the position of the central axis X can be adjusted by each lens to change the direction of light distribution. Therefore, it is not necessary to arrange each LED 13 in accordance with the direction of the light distribution, and there is no need for a relay member to adjust the direction of light distribution. It can be mounted on the LED mounting surface. Therefore, the LED module 12 can be easily manufactured.

  Moreover, since the LED arrangement member 14 of the LED module 12 is made of a flat plate having the metal base 14a, the heat generated in each of the lit LEDs 13 can be conducted and released to the metal base 14a. . The heat of the metal base 14a is transmitted to the metal instrument body 5 via the metal module support plate 9 in surface contact with the metal base 14a, and is released from the instrument body 5 to the outside. Is done. In this case, since the LED disposing member 14 is a flat plate, heat transfer with the module support plate 9 which is a heat radiating member is smooth. As described above, the temperature rise of each LED 13 is suppressed, and subtle color variations based on the temperature variations of each LED 13 can be suppressed.

  And since the temperature rise of LED13 is suppressed as mentioned above, it can make it difficult to raise the temperature of the space in the holder formed by the LED arrangement | positioning member 14, the holder 15, and the lens 16. FIG. Therefore, there is no fear that the mutual positional relationship between the holder 15 that defines the radial position of the lens 16 and the lens 16 supported by the holder 15 will be distorted due to the difference in thermal expansion between the holder 15 and the lens 16.

  Further, the lens 16 has a light exit surface 16a which is a flat surface, and does not have a light exit surface having a sawtooth structure for bending and emitting the light to the outside. Loss associated with light control is small and light extraction efficiency is good. Therefore, it is suitable for illuminating a wide range.

  In the first embodiment, the lens described above is used instead of the case where a reflector having a concave reflecting surface is used as a light distribution control member that reflects and controls light emitted from the LED instead of the lens 16. 16 is preferable in that the light use efficiency is high.

  A second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 8, the second embodiment shows an embodiment that is implemented as a lighting fixture 1 that is embedded in a ceiling surface 2 of a room, for example, and is suitable for downward illumination that illuminates the floor surface of the room as an irradiation surface 3.

  As shown in FIG. 8, the lighting fixture 1 includes a metallic fixture body 5 and a light source unit 11 a built in the fixture body 5. The instrument body 5 is formed by closing the upper end of the side wall in the shape of a square box with a ceiling wall and providing an irradiation opening 5a at the lower end. As the heat radiating member, for example, a module support plate 9 is incorporated in the instrument body 5 so as to be able to conduct heat to the instrument body 5.

  The light source part 11a consists of one LED module, for example. The light source unit 11a is mounted on the lower surface of the module support plate 9 so as to allow good heat conduction, and faces the irradiation opening 5a. As shown in FIG. 9, the light source unit 11 a includes a plurality of, for example, nine SMD type LEDs 13, a single LED arrangement member 14, and the same number of lenses as the LEDs 13. A plurality of types, for example, two types of lenses are used. Specifically, one lens 51 and eight lenses 61 are used.

  Each LED 13 has the same color, for example, emits white light. The LED arrangement member 14 functions as a module substrate, and is formed of a printed wiring board made of a flat plate. The LED mounting member 14 has, for example, a square shape. Preferably, as shown in FIG. 11, an insulating layer 14b that is considerably thinner than this is laminated on one surface of the metal base 14a, and further, a predetermined pattern is formed on the insulating layer 14b. A formed metal base printed wiring board provided with a conductor (not shown) is used. The LED mounting member 14 is fixed to the module support plate 9 by bringing the back surface of the metal base 14 a made of a metal material having excellent thermal conductivity such as Al into surface contact with the module support plate 9.

  Each LED 13 is mounted on the LED arrangement member 14. These LEDs 13 are fixed on the insulating layer 14b of the LED arrangement member 14 using an adhesive (not shown). As shown in FIG. 9, the LEDs 13 are arranged at intervals, for example, at predetermined intervals in the vertical and horizontal directions, and these are connected to the conductor (not shown) by bonding wires (not shown). .

  The lens 51 is an integrally molded product made of a transparent material such as a transparent acrylic resin. As shown in FIG. 11, the lens 51 has a light emitting surface 51a, a concave portion 51b in which the LED 13 is accommodated, a reflective surface 51c, and a convex lens portion 51f.

  The light emitting surface 51a is a surface that forms the front surface of the lens 51, and is made of a flat surface having no irregularities. By making the light emitting surface 51a flat as described above, it becomes difficult for dust to adhere to the light emitting surface 51a, and the attached dust can be easily removed, and the light extraction efficiency can be easily maintained. The concave portion 51 b is formed to be recessed toward the light emitting surface 51 a on the side opposite to the light emitting surface 51 a (the back side of the lens 51), and is open to the back side of the lens 51. The inner surface of the recess 51b is formed by a convex lens portion 51f that protrudes toward the open end of the recess 51b. The reflecting surface 51c is formed so as to extend between the open end of the recess 51b and the light emitting surface 51a. The reflecting surface 51c is formed with a predetermined curvature and is, for example, a total reflecting surface.

  The recess 51b is made of a cylindrical surface, for example. The central axes X of the concave portion 51b and the convex lens portion 51f are coincident with each other and also coincide with the optical axis Y of the LED 13 disposed in the concave portion 51b. The reflection surface 51 c is symmetric with respect to the optical axis X of the LED 13. The light emitting surface 51a is formed as a flat surface orthogonal to the optical axis Y of the LED 13 and the central axis X, and has a circular shape. A portion substantially surrounded by the light emitting surface 51a, the recess 51b, and the reflecting surface 51c forms a light control unit 51g.

  The light distribution peak angle of the lens 51 having such a configuration is 0 °, and has a predetermined beam angle (light distribution spread angle) corresponding to the reflection surface 51c. The lens 51 accommodates the LED 13 positioned at the center of the LED arrangement member 14 in the recess 51b and is attached to the LED mounting surface of the LED arrangement member 14 by adhesion or the like. The light exit surface 51c of the lens 51 does not cross obliquely with respect to the optical axis X of the LED 13, and is provided in parallel with the surface (LED mounting surface) of the LED arrangement member 14 on which the LED 13 is mounted. And opposed to the irradiation opening 5a.

  The other eight lenses 61 are also integrally molded products made of a transparent material such as a transparent acrylic resin. As shown in FIG. 11, the lens 61 has a light emitting surface 61a, a recessed portion 61b, a reflecting surface 61c, and a convex lens portion 61f. These lenses 61 and the lens 51 have the same height H.

  The light emitting surface 61a is a surface that forms the front surface of the lens 61, and is made of a flat surface having no irregularities. By making the light emitting surface 61a flat as described above, it becomes difficult for dust to adhere to the light emitting surface 61a, and it is possible to easily remove the attached dust and to easily maintain the light extraction efficiency. The concave portion 61b is formed to be recessed toward the light emitting surface 61a on the side opposite to the light emitting surface 61a (the back side of the lens 61), and is open to the back side of the lens 61. The inner surface of the recess 61b is formed by a convex lens portion 61f protruding toward the open end of the recess 61b. The reflection surface 61c is formed so as to extend between the open end of the recess 61b and the light emission surface 61a. The reflection surface 61c is, for example, a total reflection surface.

  The recess 61b is made of, for example, a conical surface. The recess 61b is formed symmetrically around the central axis X1, and the central axis X1 obliquely intersects the optical axis Y of the LED 13 disposed in the recess 61b. This intersecting angle is indicated by the symbol α. The reflection surface 61 c is asymmetric with respect to the optical axis X of the LED 13.

  The convex lens portion 61f is formed symmetrically about the central axis line X2, and the central axis line X2 also obliquely intersects the optical axis Y of the LED 13 disposed in the concave portion 61b. That is, the convex lens portion 61f is asymmetric with respect to the optical axis X of the LED 13, and the intersecting angle is indicated by the symbol β. This angle β is larger than the angle α. Therefore, the central axis X2 of the convex lens portion 61f does not coincide with the central axis X1 of the reflecting surface 61c, and is provided slightly parallel to each other.

  The light emitting surface 61a is not formed by a surface orthogonal to the central axes X1 and X2, but is formed by a flat surface orthogonal to the optical axis Y of the LED 13 and obliquely intersecting these. A portion substantially surrounded by the light emitting surface 61a, the recess 61b, and the reflecting surface 61c constitutes a light control unit 61g.

  As the lens 61 having such a configuration, for example, three types of light distribution peak angles of 10 °, 20 °, and 30 ° are prepared as standard depending on the design differences of the reflecting surface 61c and the convex lens portion 61f, and the beam angle. Three types of 10 °, 20 °, and 30 ° are also prepared for (the spread angle of light distribution). Among these, FIG. 12 illustrates a light distribution characteristic of a lens having a light distribution peak angle α1 of 10 ° and a beam angle (light distribution spread angle) γ1 of 20 °, and FIG. The light distribution characteristics of a lens having a beam angle (light distribution spread angle) γ2 of 20 ° at 20 ° will be exemplified. As is clear from the light distribution characteristics shown in FIGS. 12 and 13, the lens 61 has a predetermined light distribution peak angle and beam angle according to the design.

  Each lens 61 having the above-described configuration is positioned around the lens 51 at the central position, and the LED 13 is housed in the recess 61b and attached to the LED mounting surface of the LED arrangement member 14 by bonding or the like. In this case, each lens 61 is arranged symmetrically with respect to the lens 51. Therefore, as shown in FIG. 11, the inclinations of the reflection surfaces 61 c and the convex lens portions 61 f of the two lenses 61 arranged 180 ° apart so as to sandwich the lens 51 at the center position are opposite to each other. . Further, the light emission surface 61c of each lens 61 mounted on the LED arrangement member 14 does not cross obliquely with respect to the optical axis X of the LED 13, and the LED arrangement member 14 on which the LED 13 is mounted. It is provided in parallel with the surface (LED mounting surface) and faces the irradiation opening 5a.

  As described above, the plurality of lenses included in the light source unit 11a of the lighting fixture 1 have a combination in which vectors connecting the optical axis Y of the LED 13 and the center of the lens exit surface are different. In other words, a plurality of types of lenses 51 and 61 having different light distribution peak angles are combined. Specifically, as described above, the peak angle of the light distribution of the lens 51 is 0 °, and the light distribution peak angles of the eight lenses 61 arranged around the lens are three types prepared in advance. Depending on the selection of the lens from among these, it is either 10 °, 20 ° or 30 °.

  By turning on such a lighting fixture 1, an area directly below the lighting fixture 1 (a reference numeral surrounded by a solid line in FIG. 10) is formed by one lens 51 and the LED 13 covered by the lens 51 with respect to the lower irradiation surface 3. The area indicated by A) is illuminated according to the beam angle of the lens 51. At the same time, among the eight lenses 61 with respect to the irradiation surface 3, the four lenses 61 adjacent to the lens 5 in the vertical and horizontal directions, and the LEDs 13 individually covered by these lenses 61, and the light distribution of these four lenses 61. A region (a region indicated by reference numeral B surrounded by a dotted line in FIG. 10) that is overlapped with a part of the region A and deviated from the region A is illuminated according to the peak angle and beam angle. Similarly, with respect to the irradiation surface 3, among the four lenses 61, the other four lenses that are obliquely adjacent to the lens 5 and the LEDs 13 that are individually covered by the four lenses 61 are used. A region that is in contact with the region A according to the peak angle and beam angle of light distribution and that is partly wrapped in the region B and deviated from the regions A and B (enclosed by a two-dot chain line in FIG. The area shown) is illuminated. Therefore, it is possible to illuminate a wide range of the irradiation surface 3 below the lighting fixture 1.

  In this case, the lenses 51 and 61 have flat light emitting surfaces 51a and 61a, and do not have a light emitting surface having a sawtooth structure for bending light to be emitted to the outside. Loss associated with light control at the exit surfaces 51a and 61a is small, and the light extraction efficiency is good. Therefore, it is suitable for illuminating a wide range.

  In order to obtain such illumination, as described above, the light source unit 11a in which a plurality of types of lenses 51 and 61 having different light distribution peak angles are combined is used. It is not necessary to arrange the lens 61 having a light peak angle of 0 ° and the LED 13 covered by the lens 61, and the lens 61 having a light distribution peak angle of 0 ° and the LED 13 covered by the lens 61 directly above the four regions C. There is no need to arrange the lens 61 and the LED 13 covered by the lens 51 and the LED 13 covered by the lens 51 and the LED 13 covered by the lens 51 can be arranged close to each other. Thereby, since the light source unit 11a in which the LEDs 13 and the lenses 51 and 61 are more closely packed can be used, an area required for installing the light source unit 11a is reduced.

  In addition, since the lens 61 having a light distribution peak angle larger than 0 ° is used to illuminate the regions B and C, the LEDs that illuminate the regions B and C and the lens 61 covering the LEDs can be separated into individual regions. There is no need to tilt each direction differently. Thereby, since the dimension of the thickness direction of the light source part 11a becomes thin, according to it, the thickness of the instrument main body 5 can be comprised compactly.

  As described above, the installation area of the light source unit 11a which is an LED module and the thickness of the light source unit 11a are reduced, so that the fixture body 5 and thus the lighting fixture 1 can be made compact.

  Moreover, since the LED arrangement member 14 of the light source unit 11a is made of a flat plate having the metal base 14a, heat generated in each of the lit LEDs 13 can be conducted and released to the metal base 14a. . The heat of the metal base 14a is transmitted to the metal instrument body 5 via the metal module support plate 9 in surface contact with the metal base 14a, and is released from the instrument body 5 to the outside. Is done. In this case, since the LED disposing member 14 is a flat plate, heat transfer with the module support plate 9 which is a heat radiating member is smooth. As described above, the temperature rise of each LED 13 is suppressed, and subtle color variations based on the temperature variations of each LED 13 can be suppressed.

  In the second embodiment, a lens 61 having a light distribution peak angle different from that of the lens 51 is arranged around one lens 51 positioned at the center of the lens group with a light distribution peak angle of 0 °. Instead, for example, the middle three lenses adjacent in the vertical direction (vertical direction) in FIG. 9 are used as lenses having a light distribution peak angle of 0 °, and light distribution peaks are applied to the six lenses on both the left and right sides. It can be carried out using a lens whose angle is selected, for example, from 10 °, 20 °, 30 °. Similarly, for example, the middle three lenses adjacent in the horizontal direction (left-right direction) in FIG. 9 are used as lenses having a light distribution peak angle of 0 °, and the light distribution peak angles of the six lenses on the upper and lower sides thereof are, for example, It can also be implemented using a lens selected from 10 °, 20 ° and 30 °.

The figure which shows roughly the installation state of the lighting fixture which concerns on 1st Embodiment of this invention. The perspective view which shows the lighting fixture of FIG. FIG. 2 is a schematic cross-sectional view showing the lighting apparatus of FIG. 1. (A) is a front view which shows the LED module with which the lighting fixture of FIG. 1 is provided. FIG. 5B is a side view showing the LED module of FIG. (A) is a front view which expands and shows a part of LED module of FIG. FIG. 5B is a cross-sectional view taken along line F5-F5 in FIG. The side view which carried out the partial cross section which shows the other lens for light distribution control which can be used for the LED module of FIG. The side view which carried out the partial cross section which shows the other lens for light distribution control which can be used for the LED module of FIG. The figure which shows roughly the installation state of the lighting fixture which concerns on 2nd Embodiment of this invention. The front view which shows the LED module with which the lighting fixture of FIG. 8 is provided. The figure which shows the illumination pattern by the lighting fixture of FIG. Sectional drawing which shows the light source part with which the lighting fixture of FIG. 8 is provided. The figure which shows the light distribution curve by the one part lens used for the light source part with which the lighting fixture of FIG. 8 is provided. The figure which shows the light distribution curve by the other lens which can be used for the light source part with which the lighting fixture of FIG. 8 is provided.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lighting fixture, 2 ... Appliance main body, 5a ... Irradiation opening, 9 ... Module support plate (heat radiating member), 11 ... Light source part, 11a ... Light source part which serves as LED module, 12 ... LED module, 13 ... LED, 14 ... LED arrangement member, 14a ... metal base, 15 ... holder, 15b ... support portion, 16 ... lens, 16a ... light exit surface, 16b ... concave portion, 16c ... reflective surface, 16f ... convex lens portion, 51 ... lens, 51a ... light Emitting surface, 51b ... concave portion, 51c ... reflecting surface, 51f ... convex lens portion, 61 ... lens, 61a ... light emitting surface, 61b ... concave portion, 61c ... reflecting surface, 61f ... convex lens portion, X ... optical axis of LED, Y ... Center axis of concave and convex lens

Claims (4)

A plurality of LEDs;
An LED arrangement member in which these LEDs are mounted at intervals;
A flat light exit surface having no irregularities, a recess provided in a recess toward the light exit surface on the opposite side of the light exit surface, and forming a rear surface of the recess and projecting toward the open end of the recess A convex lens part, and a reflection surface that connects the open end of the concave part and the light emitting surface and reflects the light emitted from the LED toward the light emitting surface; A plurality of light distributions for individually storing the LEDs in the recesses on the LED mounting surface and arranging the light emitting surface in parallel with the LED mounting surface and distributing light emitted from the LEDs in a predetermined direction A control lens;
Comprising
An LED module, wherein at least one of the plurality of lenses is formed in an asymmetric shape with respect to the optical axis, with the central axis of the convex lens portion intersecting the optical axis of the LED. A plurality of LEDs;
An LED arrangement member in which these LEDs are mounted at intervals;
A plurality of holders each including the LED inside and disposed on an LED mounting surface of the LED mounting member, and having a circular or regular polygonal support centered on the stored LED;
A flat light exit surface having no irregularities, a recess provided in a recess toward the light exit surface on the opposite side of the light exit surface, and forming a rear surface of the recess and projecting toward the open end of the recess A convex lens part and a reflection surface for connecting the open end of the concave part and the light emitting surface to reflect the light emitted from the LED toward the light emitting surface, and forming the LED in the concave part A plurality of light distribution control lenses that are individually housed and are respectively supported by the support portions of the holder with the light emitting surface parallel to the LED mounting surface, and distribute light emitted from the LEDs in a predetermined direction. When;
Comprising
At least one lens among the plurality of lenses is provided on the holder supporting the lens so as to be movable around a perpendicular to the LED mounting member, and the central axis of the convex lens portion is set to the LED. The LED module is formed to be asymmetric with respect to the optical axis so as to intersect the optical axis.   The LED module according to claim 1, wherein the LED mounting member is made of a flat plate having a metal base from which heat of the LED is released. An instrument body having an irradiation aperture;
A light source part formed by using at least one LED module according to any one of claims 1 to 3 and attached to the instrument body to distribute light through the irradiation opening;
The lighting fixture characterized by comprising.

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