JP2015082470A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture with uniform light distribution characteristics, which enables an irradiation region of illumination light to assume an approximately polygonal shape, without decreasing utilization efficiency of light source light.SOLUTION: A lighting fixture 100 comprises a light source 110 that emits light, and a lens 120 that permits transmission of light emitted from the light source 110. A lens 120 is configured so that the lighting fixture 100 can have square and approximately uniform light distribution characteristics. The lighting fixture 100 also comprises air-cooling means 130 for cooling the light source 110.

Description

  The present invention relates to a lighting fixture, and more particularly to a lighting fixture having a substantially polygonal shape having three or more corners and a substantially uniform light distribution characteristic.

  Conventionally, there are various types of lighting fixtures, each having a light distribution characteristic suitable for the application.

  For example, a streetlight that can change the irradiation area depending on the shape of the street (such as Patent Document 1), or a spotlight that is used in stores, museums, museums, and the like, and that performs spot illumination according to the size of an object to be illuminated (Patent Document) 2).

  Further, for example, some downlights have a structure in which a light source is accommodated in a dome-like case having an open bottom surface, and further include a condenser lens that controls an illumination angle. These lighting fixtures generally have a light distribution characteristic (circular light distribution characteristic) in which the irradiation shape of the irradiation horizontal plane (the shape of the light irradiation area on the illuminated surface perpendicular to the optical axis of the illumination light) is circular. Yes.

  FIG. 10 is a schematic diagram for explaining a general downlight provided with a condensing lens. The structure of the downlight (FIG. 10A) and the state where illumination is performed by the downlight (FIG. 10B). ).

  The downlight 10 includes a case 10a, a light source 11 disposed in the case 10a, and a lens 12 that collects and emits light from the light source 11.

  When the emitted light L from such a downlight 10 is irradiated onto the surface R to be illuminated, the downlight 10 has a circular light distribution characteristic, so that the light irradiation region S0 becomes circular.

  Although such a downlight 10 performs local illumination, it can be used for illumination of the entire room by mounting it in a matrix on the ceiling of the room.

JP 2012-186019 A JP 2009-129795 A

  However, since the downlight 10 or the like generally has a circular light distribution characteristic, as shown in FIG. 11 (a), in order to illuminate the entire room, the downlight 10 is arranged in a matrix on the ceiling of the room, On the floor surface F of the room, a gap region D that is difficult for the illumination light to hit is generated between the light irradiation regions S0 of the adjacent downlights. Further, in order to prevent such a gap region D that is difficult for light to strike, it is necessary to reduce the arrangement interval of the downlights, but in this case, the adjacent light irradiation regions S0 overlap, resulting in an increase in illuminance. It is not possible to obtain a uniform light distribution due to light and shade, and the use efficiency of the downlight is also poor.

  In addition, as shown in FIG. 11B, by forming a rectangular light exit window 10b on the light exit surface side of the case 10a of the downlight 10, it is possible to give the downlight 10 a square light distribution characteristic. However, in this case, since the light source light that has passed through the lens 12 is blocked in the peripheral portion of the light exit window 10b, the light source light cannot be extracted efficiently.

  The present invention has been made in order to solve the above-described problems, and to obtain a lighting apparatus having a substantially polygonal and uniform light distribution characteristic without reducing the use efficiency of light source light. With the goal.

  A luminaire according to the present invention is a luminaire including a light source that emits light and a lens that transmits light emitted from the light source, and the luminaire is substantially polygonal having three or more corners. In addition, the lens is configured to have a substantially uniform light distribution characteristic, thereby achieving the above object.

  According to the present invention, in the lighting fixture, the lens preferably has a plurality of ridge lines that branch from the vertex of the lens substantially equiangularly.

  In the lighting device according to the present invention, it is preferable that the polygon is a quadrangle.

  According to the present invention, in the luminaire described above, it is preferable that the luminaire further includes air cooling means for cooling the light source.

  The present invention provides the lighting apparatus, wherein the air cooling means includes a heat sink that cools the light source, and a plurality of air circulation holes that are arranged around the light source and from which airflow generated by heat generation is ejected from the light source. The heat sink has a plurality of cooling fins, and each of the plurality of air circulation holes is arranged to face one end of the cooling fins so that an air flow ejected from the air circulation holes hits the cooling fins. It is preferable.

  As described above, according to the present invention, it is possible to realize a lighting fixture that is substantially polygonal and has uniform light distribution characteristics without reducing the light source light utilization efficiency.

FIG. 1 is a schematic diagram for explaining a lighting fixture according to Embodiment 1 of the present invention, and FIGS. 1A and 1B show the structure of the lighting fixture and a state where illumination is performed by the lighting fixture. Yes. FIG. 2 is a schematic diagram illustrating the lighting fixture according to Embodiment 1 of the present invention. FIG. 2A is a diagram illustrating a structure of the lighting fixture viewed from the light emitting surface side, and FIG. FIGS. 2 (c), 2 (d), and 2 (e) are a perspective view, a plan view, and a side view of a lens used in this lighting fixture, respectively. FIG. 3 is a cross-sectional view illustrating the lighting fixture according to Embodiment 1 of the present invention, and shows a specific structure of the lighting fixture. FIG. 4 is a plan view for explaining the lighting fixture according to Embodiment 1 of the present invention, and shows a specific structure of the lighting fixture as viewed from the side opposite to the light emitting surface thereof. FIG. 5 is a diagram for explaining a lighting fixture according to Embodiment 1 of the present invention, and shows a light distribution characteristic of the lighting fixture in a graph. FIG. 6 is a diagram for explaining the lighting fixture according to Embodiment 1 of the present invention, and shows the relationship between the graph shown in FIG. 5 and the shape of the light irradiation region of the lighting fixture. FIG. 7 is a diagram for explaining a lighting fixture according to Embodiment 1 of the present invention. When a plurality of lighting fixtures are used to illuminate the entire room, the light irradiation areas of the individual lighting fixtures are arranged without gaps. It shows a state. FIG. 8 is a schematic diagram for explaining a lighting fixture according to Embodiment 2 of the present invention, in which the lighting fixture is illuminated by the structure (FIG. 8A) and the lighting fixture (see FIG. 8A). FIG. 8B) is shown. FIG. 9 is a schematic diagram for explaining a lighting fixture according to Embodiment 3 of the present invention, in which the lighting fixture is illuminated by the structure (FIG. 9A) viewed from the light exit surface side and the lighting fixture ( FIG. 9B) is shown. FIG. 10 is a schematic diagram for explaining a general downlight provided with a condensing lens. The structure of the downlight (FIG. 10A) and the state where illumination is performed by the downlight (FIG. 10B). ). FIG. 11 is a schematic diagram for explaining a case where a conventional downlight is used for illumination of the entire room.

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

(Embodiment 1)
FIG. 1 is a schematic diagram for explaining a lighting fixture according to Embodiment 1 of the present invention, and FIGS. 1A and 1B show the structure of the lighting fixture and a state where illumination is performed by the lighting fixture, respectively. Show.

  The luminaire 100 according to the first embodiment includes a light source 110 that emits light, a lens 120 that passes light emitted from the light source 110, and an air cooling unit 130 that cools the light source 110 by air. The light source 110 and the lens 120 are provided in the case 101 of the luminaire 100, and the air cooling means 130 is provided across the inside and the outside of the case 101.

  2A and 2B are diagrams for explaining the structures of the light source 110 and the lens 120. FIG. 2A shows the structure of the luminaire 100 viewed from the light emitting surface side, and FIG. FIGS. 2C to 2E are a perspective view, a plan view, and a side view of the lens 120, respectively.

  Here, the light source 110 is obtained by mounting a plurality of light emitting diodes (LEDs) Ed on a substrate 111, and the plurality of light emitting diodes Ed are arranged in a matrix, for example. The light source 110 is attached to a heat sink 131 (see FIG. 3) constituting the air cooling means 130 of the lighting fixture 100. Further, a lens 120 is disposed on the light emitting surface of the light source 110 so as to cover the light emitting diode Ed with a slight gap. The lens 120 is fixed by the structural member of the case 101 coming into contact with the lens pressing member 121.

  This lens 120 is configured to have four ridgelines Lr1 to Lr4 (abbreviated as ridgeline Lr in FIG. 2A) that branch from the vertex Vt of the lens substantially equiangularly. That is, the light emitting surface of the lens 120 is composed of four curved surfaces Cs1 to Cs4 (abbreviated as curved surface Cs in FIG. 2A) divided by the ridgelines Lr1 to Lr4. As a result, the luminaire 100 is substantially square (for example, square) and has a substantially uniform light distribution characteristic. As a constituent material of the lens 120, a material having high mechanical strength and easy to process, for example, an acrylic resin is used.

  FIG. 3 is a cross-sectional view illustrating a specific structure of the lighting fixture according to the first embodiment, and FIG. 4 illustrates a structure when the lighting fixture according to the first embodiment is viewed from the side opposite to the light emitting surface thereof. ing.

  The air cooling means 130 constituting the lighting apparatus 100 is disposed on the upper side of the light source 110, and is disposed around the light source 110 and the heat sink 131 that cools the light source 110. And a plurality of air circulation holes 132 ejected to the side. The heat sink 131 has a plurality of cooling fins 131a, and each of the plurality of air circulation holes 132 is arranged to face one end of the cooling fins 131a so that the air flow ejected from the air circulation holes 132 hits the cooling fins 131a. ing. In addition, a reflecting plate 122 is disposed on the light emitting side of the light source 110, and the reflecting plate 122 is fixed to the heat sink 131 with screws or the like. The reflecting surface of the reflecting plate 122 has a cone shape (conical frustum shape). Further, the periphery of the light emitting side end of the reflecting plate 122 is fitted into the annular frame 150. The annular frame 150 includes a frame body 150a that supports the reflection plate 122, and an annular flange 150b that extends outward from the lower end of the frame body 150a. Here, the annular frame 150 and the reflection plate 122 form the case 101 of the light source 100, and the reflection plate 122, the heat sink 131, the light source 110, the lens 120, and the like other than the annular frame 150 are the lighting fixture body (lamp). ). Further, an attachment spring 151 for fixing the lighting apparatus 100 to a building structure Lf such as a ceiling is attached to a part of the frame main body 150a so as to be slidable up and down and fixed at a predetermined position.

  For example, a fixture mounting hole Lfa is formed in a structure Lf such as a ceiling of a building, and a lighting fixture 100 such as a downlight is mounted in the fixture mounting hole Lfa. If it demonstrates in order of work, first, the annular frame 150 will be fixed to the appliance mounting hole Lfa of the structure (for example, the ceiling) Lf by the mounting spring 151. Specifically, in a state where the annular frame 150 is inserted into the instrument attachment hole Lfa, the attachment spring 151 and the annular flange 150b of the annular frame 150 are pushed down along the frame body 150a so that the ceiling Lf is sandwiched between them. By fastening, the annular frame 150 is fixed to the ceiling Lf. Next, when a lighting fixture body such as the heat sink 131 and the reflector 122 is inserted into the annular frame 150 from under the annular frame 150, the lighting fixture body is supported on the annular frame 150 by a support spring (not shown). Thereby, the lighting fixture 100 is attached to the structure Lf.

  Hereinafter, the light distribution characteristic of the lighting fixture 100 of this Embodiment 1 is demonstrated.

  5 and 6 are diagrams illustrating the light distribution characteristics of the lighting fixture 100. FIG. FIG. 5 shows the light distribution characteristics of this luminaire with graphs G1 and G2 showing the luminous intensity distribution, and FIG. 6 shows the relationship between the luminous intensity distribution shown in FIG. 5 and the shape of the light irradiation region S of the luminaire. Yes.

  In the luminous intensity distribution diagram shown in FIG. 5, the graph G1 shows the luminous intensity distribution in the opposite direction of the light irradiation region S of this lighting fixture, and the graph G2 shows the luminous intensity distribution in the diagonal direction of the luminous irradiation region S of this lighting fixture. Show.

  To supplement the explanation, the graph G1 takes the optical axis (irradiation axis) of the luminaire 100 in the vertical direction, and the irradiation axis (0 °) within a plane P1 including the optical axis and parallel to the opposite side direction of the light irradiation region. ) At a certain angle (for example, 5 °) up to 90 ° on both sides of the irradiation axis, and the light intensity obtained by the measurement on the two-dimensional coordinates with the irradiation axis as the vertical axis (measurement data Data-1) And the measurement angle are represented by a luminous intensity vector, and the leading ends of the luminous intensity vectors are connected. A luminous intensity vector V1 shown in FIGS. 5 and 6 is a luminous intensity vector when the measurement angle is 30 ° in the plane P1.

  The graph G2 takes the optical axis (irradiation axis) of the luminaire 100 in the vertical direction, and from this irradiation axis (0 °) in the plane P2 including the optical axis and parallel to the diagonal direction of the light irradiation area. The light intensity at a certain angle (for example, 5 degrees) is measured up to 90 degrees on both sides of the irradiation axis, and the light intensity (measurement data Data-2) and the measurement angle obtained by the measurement are measured on the two-dimensional coordinates described above. The tip of this luminous intensity vector is connected. The light intensity vector V2 shown in FIGS. 5 and 6 is a light intensity vector when the measurement angle is 30 ° in the plane P2.

  Note that the lengths of the luminous intensity vectors V1 and V2, that is, the distance from the origin O of the two-dimensional coordinates to the tips of the luminous intensity vectors V1 and V2, are the luminous intensity at each measurement angle (the magnitude of the light flux included in the unit solid angle). The direction of the luminous intensity vector indicates a direction separated by a measurement angle from the irradiation axis.

  As shown in FIG. 6, the luminous intensity distribution diagram shown in FIG. 5 is clarified when the luminous intensity distribution shown by the graph G2 and the luminous intensity distribution shown by the graph G1 are associated with the light irradiation region S. The luminous intensity distribution in the plane P2 parallel to the diagonal line of the square light irradiation region S including the optical axis Lax of the emitted light L from 100 is parallel to the side of the square light irradiation region S including the optical axis Lax. It shows that the light intensity distribution is wider than that in the plane P1. Therefore, the graphs G1 and G2 confirm that the lighting apparatus 100 of the first embodiment has a light distribution characteristic of a substantially square shape, for example, a square shape.

  Next, the operation will be described.

  In the lighting fixture 100 having such a configuration, when a power supply voltage is supplied from an external power supply via the power cable 152, each light emitting diode Ed arranged on the substrate 111 is driven, and each light emitting diode emits light.

  The light generated by the light emitting diode passes through the lens 120 disposed so as to cover the light emitting diode Ed and is emitted from the light emitting surface of the lens 120 to the illuminated surface R.

  Thus, when the light generated by the light emitting diode passes through the lens 120, the lens 120 is configured so that the luminaire 100 is substantially square and has a substantially uniform light distribution characteristic. The incident light L has a light intensity distribution indicated by the graph G1 in FIG. 5 within a predetermined plane P1 including the optical axis Lax of the outgoing light L, and includes a predetermined plane P1 including the optical axis Lax of the outgoing light L and the predetermined plane P1. 5 has a light intensity distribution indicated by a graph G2 in FIG. 5 within a plane P2 forming an angle (for example, 45 degrees).

  Thereby, the light irradiation area | region S illuminated with the emitted light L from the lens 120 becomes a rectangle.

  Further, the heat generated in the light emitting diode Ed is transferred to the heat sink 131 through the substrate 111 and is released from the heat radiating fins 131a. The air on the light emitting surface side of the lens 120 is heated by the heat generated by the light emitting diode Ed to generate an air flow. The air flow moves from the lower side of the substrate 111 to the heat sink side through a plurality of air circulation holes 132 arranged around the substrate 111 and is jetted toward the heat radiating fins 131a to cool the radiating fins 131. Thereby, air cooling of the light source 110 is performed.

  As described above, in the first embodiment, in the luminaire 100 including the light source 110 that emits light and the lens 120 that transmits the light emitted from the light source 110, the luminaire 100 is square and has substantially uniform light distribution characteristics. Since the lens 120 is configured so that the illumination light irradiation efficiency is reduced, the illumination light irradiation area can be made substantially rectangular without reducing the light source light utilization efficiency.

  For this reason, as shown in FIG. 7, when the whole room is illuminated using a plurality of the lighting fixtures 100, the floor surface of the room is formed by the light irradiation areas S of the plurality of lighting fixtures 100 arranged in a matrix. It is possible to illuminate F so that there is no gap and the adjacent light irradiation regions S do not overlap.

  In the first embodiment, the luminaire 100 further includes the air cooling means 130 for cooling the light source 110, so that the light source 110 can be prevented from being overheated. Moreover, in the air cooling means 130, since the air circulation holes 132 are arranged so that the air flow generated by heating the light source hits the cooling fins 131a of the heat sink 131, the air generated by the heat generation of the light source without using the power of a fan or the like. The light source can be effectively cooled by the flow. Since the air flow rate per unit time is constant, the flow velocity of the air flowing through the air circulation holes 132 having an extremely small diameter compared to the inner diameter of the case 101 on the lower side of the light source 110 is extremely high, and the cooling effect is enormous. .

  In the first embodiment, the configuration of the lens 120 is configured to have four ridge lines that branch substantially equiangularly from the apex of the lens. However, the configuration of the lens 120 is not limited to that of the first embodiment, and the lens As long as the lighting fixture 100 is configured to have a substantially polygonal shape having three or more corners and a substantially uniform light distribution characteristic.

  Hereinafter, as Embodiments 2 and 3 of the present invention, an example of a lighting fixture in which the lighting fixture is a polygon other than a quadrangle and has a substantially uniform light distribution characteristic will be described.

(Embodiment 2)
FIG. 8 is a schematic diagram for explaining a lighting fixture according to Embodiment 2 of the present invention, in which the lighting fixture is viewed from the light exit surface side (FIG. 8A), and the lighting fixture is in a state of being illuminated. (FIG. 8B) is shown.

  Similar to the lighting fixture 100 of the first embodiment, the lighting fixture 100a according to the second embodiment includes a light source 110 that emits light, and a lens 120a that passes light emitted from the light source 110.

  In the lighting apparatus 100a according to the second embodiment, unlike the lens according to the first embodiment, the lens 120a is configured to have six ridge lines Lr1 to Lr6 that branch from the vertex Vt of the lens substantially equiangularly. Thus, the lighting fixture 100a has a substantially hexagonal and substantially uniform light distribution characteristic. The light exit surface of the lens 120a is composed of six curved surfaces Cs1 to Cs6 divided by ridgelines Lr1 to Lr6.

  In addition, the other structure of the lighting fixture of this Embodiment 2 is the same as that of Embodiment 1.

  In the lighting fixture 100a according to the second embodiment having such a configuration, the light La generated by the light emitting diode Ed when the power is turned on passes through the lens 120a and is emitted from the light emitting surface to the illuminated surface R.

  Thus, when the light generated by the light emitting diode Ed passes through the lens 120a, the lens 120a forms the six ridge lines Lr1 to Lr6 on the light exit surface, so that the luminaire 100 is substantially hexagonal and substantially evenly arranged. Since it is configured to have optical characteristics, in the outgoing light La from the lens 120a, the light distribution in the direction along the ridge line is wider than the light distribution in the direction other than the direction along the ridge line. . For this reason, the light irradiation region Sa illuminated by the light L emitted from the lens 120a has a hexagonal shape.

  As described above, in the lighting fixture 100a of the second embodiment, similarly to the lighting fixture 100 of the first embodiment, the illumination light irradiation area can be made substantially hexagonal without reducing the use efficiency of the light source light.

  In addition, since the lighting fixture 100a also includes air cooling means for cooling the light source 110, the light source 110 can be efficiently air-cooled without using a fan or the like, similarly to the lighting fixture 100 of the first embodiment. .

(Embodiment 3)
FIG. 9 is a schematic diagram for explaining a lighting fixture according to Embodiment 3 of the present invention, in which the lighting fixture is viewed from the light emission surface side (FIG. 9A), and the lighting fixture is in a state of being illuminated. (FIG. 9B) is shown.

  Similarly to the lighting fixture 100 of the first embodiment, the lighting fixture 100b according to the third embodiment also includes a light source 110 that emits light and a lens 120b that passes light emitted from the light source 110.

  In the lighting apparatus 100b according to the third embodiment, the lens 120b is configured to have three ridge lines Lr1 to Lr3 that branch from the vertex Vt of the lens substantially equiangularly, unlike the lens according to the first or second embodiment. Thus, the luminaire 100b has a substantially triangular and substantially uniform light distribution characteristic. The light exit surface of the lens 120b is composed of three curved surfaces Cs1 to Cs3 divided by ridge lines Lr1 to Lr3.

  In addition, the other structure of the lighting fixture of this Embodiment 3 is the same as that of Embodiment 1.

  In the lighting apparatus 100b according to the third embodiment having such a configuration, when the light emitting diode Ed is driven by turning on the power, light generated by each light emitting diode is emitted from the light emitting surface to the illuminated surface R through the lens 120b. To do.

  Thus, when the light generated by the light emitting diode passes through the lens 120b, the lens 120b is formed with three ridge lines Lr1 to Lr3 on its light exit surface, so that the lighting fixture 100b is substantially triangular and has substantially uniform light distribution characteristics. Therefore, in the emitted light Lb from the lens 120b, the luminous intensity distribution in the direction along the ridge line is wider than the luminous intensity distribution in the direction other than the direction along the ridge line. For this reason, the light irradiation area | region Sb where the emitted light Lb from the lens 120b was illuminated becomes a substantially triangle.

  As described above, in the lighting fixture 100b of the third embodiment, similarly to the lighting fixture 100 of the first embodiment, the illumination light irradiation area can be made substantially triangular without reducing the use efficiency of the light source light.

  Moreover, since the lighting fixture 100b also includes air cooling means for cooling the light source 110, the light source 110 can be efficiently air-cooled without using a fan or the like.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  INDUSTRIAL APPLICABILITY In the field of lighting equipment, the present invention can realize a lighting equipment that has a substantially polygonal and uniform light distribution characteristic without reducing the light source light utilization efficiency.

100, 100a, 100b Lighting fixture 101 Case 110 Light source 111 Substrate 120, 120a, 120b Lens 121 Lens holding member 122 Reflecting plate 130 Air cooling means 131 Heat sink
131a cooling fin 132 air circulation hole 150 annular frame material 150a frame main body 150b flange 151 mounting spring 152 power cable Cs, Cs1 to Cs6 curved surface Ed light emitting diode L, La, Lb outgoing light Lax optical axis Lr, Lr1 to Lr6 ridgeline P1, P2 Surface R Illuminated surface S, Sa, Sb Light irradiation area Vt vertex

Claims (5)

A light source that emits light;
A luminaire comprising a lens through which light emitted from the light source passes,
A luminaire wherein the lens is configured such that the luminaire is substantially polygonal with more than two corners and has a substantially uniform light distribution characteristic.   The lighting device according to claim 1, wherein the lens has a plurality of ridge lines that branch substantially equiangularly from the apex of the lens.   The lighting fixture according to claim 1, wherein the polygon is a quadrangle.   The lighting fixture according to claim 1, further comprising an air cooling means for cooling the light source. The air cooling means is
A heat sink for cooling the light source;
A plurality of air circulation holes arranged around the light source and from which the air flow generated by heat generation is ejected.
The heat sink has a plurality of cooling fins;
2. The luminaire according to claim 1, wherein each of the plurality of air circulation holes is disposed to face one end of the cooling fin such that an air flow ejected from the air circulation hole hits the cooling fin.