JP2007335420A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture capable of increasing the light-extraction efficiency from the lighting fixture main body. <P>SOLUTION: In the lighting fixture provided with: LED module 2 wherein a plurality of light-emitting devices 1 having a LED chip are disposed on a first surface of a base plate 200; and a lighting fixture main body 100 in which the LED module 2 is housed, the LED module 2 is housed in such a way that it retracts through an opening part 102 of the lighting fixture main body 100. A reflective structure 5 is disposed on the first surface of the base plate 200 so that the structure 5 prevents a part of light from each of the light-emitting devices 1 from illuminating an inside face of the lighting fixture main body 100 by reflection. In the LED module 2 provided with a cover member 3 having a lens 301 which is disposed at a location facing each of the light-emitting devices 1 and controls orientation of the light emitted from the light-emitting device 1, the reflective structure 5 inhibits the light leaking out from an outside face 301c of an adjacent first lens 301 from reaching an adjacent second lens 301, and reflects the light to the first lens 301. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting fixture including a light emitting device using an LED chip as a light source.

  Conventionally, as this type of lighting fixture, as shown in FIG. 13, an LED module 2 ′ in which a plurality of light emitting devices 1 ′ using LED chips are arranged on one surface side of a base substrate 200 ′ made of a circuit board; In addition, a lens 301 ′ that controls the orientation of the light emitted from the light emitting device 1 ′ is provided in each of the portions that surround the light emitting devices 1 ′ on the one surface side of the base substrate 200 ′ and that face the light emitting devices 1 ′. A light source unit A ′ comprising a cover member 3 ′ has been proposed. As an application example thereof, for example, as shown in FIG. 14, the light source unit A ′ is connected to an opening window 102 ′ of the lamp body 100 ′. A downlight that has been retracted and stored has been proposed (see, for example, Patent Document 1). In Patent Document 1, various lighting fixtures (for example, ceiling lights, spotlights, etc.) are proposed as examples of lighting fixtures including a light emitting device using an LED chip as a light source. ing.

  By the way, in a luminaire provided with a light emitting device using an LED chip as a light source, as a lens structure for controlling the light distribution of light emitted from the light emitting device, at least one of the light emitting devices 1 ′ as shown in FIG. A lens 301 ′ having a recess 302 ′ for housing a portion (all in the illustrated example) is proposed (see, for example, Patent Documents 2 to 4).

Here, the lens 301 ′ shown in FIG. 15 has a function of directly guiding light incident from the inner bottom surface 302a ′ of the recess 302 ′ to the light exit surface 301b ′ and the inner surface 302b ′ of the recess 302 ′. It has a function of guiding light to the light exit surface 301b ′ by reflecting the light on the outer surface 301c ′. In FIG. 15, each lens 301 ′ is formed continuously and integrally with the cover member 3 ′. However, a lens in which each lens 301 ′ is formed separately from the cover member 3 ′ has been proposed (for example, Patent Documents). 5).
JP 2002-304904 A JP 2005-149790 A JP 2006-24381 A JP 2005-183591 A JP 2005-248461 A

  When the structure of the lens 301 ′ of FIG. 15 is adopted in the lighting fixture having the configuration shown in FIG. 14, the light emitting device 1 ′ is radiated from the light emitting device 1 ′ in the lighting state in which each light emitting device 1 ′ is turned on. A part of the light leaking from the outer surface 301c ′ of the lens 301 ′ facing the lens and entering the outer surface 301c ′ of the adjacent lens 301 ′ is irradiated on the inner surface of the lamp body 100 ′ (FIGS. 15 and 16). Since the broken line in the middle indicates the light propagation path), the light extraction efficiency from the lamp body 100 ′ is reduced. In short, even in a lighting fixture including a lens 301 ′ that controls light distribution for each of the plurality of light emitting devices 1 ′, the light extraction efficiency is reduced due to light leaking from the outer surface 301c ′ of each lens 301 ′. There was a bug that it was. In the lighting fixture having the configuration shown in FIG. 14, as described above, when a part of the light emitted from the light emitting device 1 ′ is irradiated on the inner surface of the lamp body 100 ′ through the lens 301 ′, the lamp body A striped pattern appears on the inner surface of 100 'and the aesthetic appearance is impaired (the cross-hatched part B in Fig. 15 indicates the region where the striped pattern appears).

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can improve the light extraction efficiency from a lamp main body.

  The invention of claim 1 includes an LED module in which a plurality of light emitting devices using LED chips are arranged on one surface side of a base substrate, and a lamp body in which the LED module is housed, and the LED module is a lamp body. It is housed and arranged in the lamp body so as to recede from the opening window, and a part of the light from each light emitting device is reflected on the one surface side of the base substrate and irradiated to the inner surface of the lamp body. It is characterized by being provided with a reflective structure to be suppressed.

  According to this invention, it can suppress that the light radiated | emitted from each light-emitting device is irradiated to the inner surface of a lamp main body, and can improve the light extraction efficiency from a lamp main body.

  According to a second aspect of the present invention, in the first aspect of the present invention, the light emitted from the light-emitting device is surrounded by the one surface side of the base substrate, and the light emitted from the light-emitting device to each portion facing the light-emitting device. A cover member provided with a lens for controlling the orientation is provided, and each lens is formed in a convex shape toward the light emitting device, and a recess for accommodating at least a part of the light emitting device is formed at the tip portion. The reflecting structure is provided between the LED module and the cover member, and prevents the light leaking from the outer surface of one lens of adjacent lenses from reaching the other lens. It reflects to the lens side.

  According to this invention, the reflecting structure is provided between the LED module and the cover member, and prevents light leaking from the outer surface of one lens of adjacent lenses from reaching the other lens. Since the light is reflected to the one lens side, light leaking from the outer surface of one lens of the adjacent lens can be prevented from entering the outer surface of the other lens and returned to the one lens side, As a result, the light extraction efficiency can be increased.

  According to the first aspect of the invention, it is possible to suppress the light emitted from each light emitting device from being applied to the inner surface of the lamp body, and to increase the light extraction efficiency from the lamp body.

  Hereinafter, the lighting fixture of this embodiment is demonstrated, referring FIGS.

  The lighting fixture of this embodiment is a downlight, and as shown in FIGS. 1 to 3, a plurality of light emitting devices 1 using LED chips 10 (see FIGS. 6 to 9) are provided on one surface of the base substrate 200. The LED module 2 arranged on the side (the lower surface side of FIG. 1A) and the light emitting device 1 in each part surrounding the light emitting device 1 on the one surface side of the base substrate 200 and facing the light emitting device 1. A metal (for example, heat of Al, Cu, etc.) in which the light source unit A including the cover member 3 provided with the lens 301 for controlling the orientation of the light emitted from the LED module 2 and the cover member 3 is housed. And a lamp body 100 made of a metal having a high conductivity.

  The lamp body 100 is formed in a box shape having a circular opening window 102 on the lower surface (that is, a box shape having one surface opened), and an outer collar portion 103 is extended outward from the lower end portion. The outer flange portion 103 is inserted into an attachment hole penetrating the ceiling material, which is a construction material, and is attached to the ceiling material in such a manner that the outer flange portion 103 comes into contact with the lower surface of the peripheral portion of the attachment hole. An electric wire insertion hole 104 is inserted through the central portion of the bottom wall of the lamp body 100 for inserting electric wires 96 and 96 for supplying power to the light source unit A. Here, a first connector for output of a separate power supply unit (not shown) is provided on the other end side opposite to the one end side connected to the circuit board 400 of the light source unit A in each of the electric wires 96, 96. A second connector 97 that is detachably connected is provided. On the other hand, an electric wire insertion hole 401 through which the electric wires 96 are inserted is formed at the center of the circuit board 400. A U-shaped holding member 140 integrally provided with a pair of attachment springs 145 made of leaf springs for attaching the lamp body 100 to a ceiling member is attached to the outside of the lamp body 100.

  The lamp body 100 has an opening area that gradually increases with distance from the inner bottom surface 100a, and the other surface of the light source unit A (the upper surface in FIG. 1A) contacts the inner bottom surface 100a. Unit A is stored and arranged. Here, in the lighting fixture of this embodiment, the thickness dimension of the light source unit A is smaller than the depth dimension of the lamp body 100, and the lamp body is retreated from the opening window 102 of the lamp body 100. 100 is housed and arranged.

  The base substrate 200 of the LED module 2 has a disk shape and is formed of a heat conductive material (for example, a metal having high heat conductivity such as Al or Cu). On the other hand, each light emitting device 1 of the LED module 2 is provided with the LED chip 10 and a pair of lead patterns 23 and 23 (see FIG. 6) for supplying power to the LED chip 10, and the LED chip 10 is mounted. And a mounting board 20.

  The LED module 2 includes a disk-shaped glass epoxy (FR4) in which a conductor pattern (not shown) that defines the connection relationship of each light emitting device 1 is formed in addition to the base substrate 200 and each light emitting device 1 described above. ) A circuit board 400 comprising a substrate is provided, and the circuit board 400 has a window hole 403 (FIG. 1B, FIG. 4 and FIG. 4) through which a part of each light-emitting device 1 passes through a portion corresponding to each light-emitting device 1. 6) is formed. In addition, the material of the insulating base material of the circuit board 400 is not limited to a glass epoxy resin such as FR4, and may be, for example, a polyimide resin or a phenol resin.

  Each light emitting device 1 is, for example, a resin sheet containing a filler made of a filler such as silica or alumina and having a low viscosity when heated (for example, an organic green sheet such as an epoxy resin sheet highly filled with fused silica). After the plastic sheet 90 having high thermal conductivity and high fluidity during heating is interposed between the one surface of the base substrate 200, the plastic sheet 90 is heated and plastically deformed to form the base substrate 200. It is fixed. Accordingly, when a rubber sheet-like heat dissipation sheet such as Sarcon (registered trademark) is sandwiched between the light emitting device 1 and the base substrate 200, or when the light emitting device 1 and the base substrate 200 are simply brought into contact with each other. In comparison, the thermal resistance from each LED chip 10 to the base substrate 200 can be reduced, and the variation in thermal resistance from the LED chip 10 to the base substrate 200 for each light emitting device 1 can be reduced, improving heat dissipation, Since the temperature rise of the junction temperature of each LED chip 10 can be suppressed, the input power to each LED chip 10 can be increased and the light output can be increased.

  The circuit board 400 has the above-described window holes 403 formed in portions corresponding to the respective light emitting devices 1, and the peripheral portion of the window holes 403 overlaps the peripheral portion of the mounting substrate 20 on the mounting surface side of the LED chip 10. The base substrate 200 is disposed away from the one surface. The opening size of the window hole 403 is set so as to be larger than the outer diameter of the color conversion member 70 described later and to allow a part of the lens 301 to be inserted.

  The conductor pattern in the circuit board 400 is designed so that the connection relationship of the plurality of light emitting devices 1 is a serial connection relationship, and is formed in the electric wire insertion hole 104 of the lamp body 100 and the central portion of the base substrate 200. A pair of power supply wires (not shown) inserted through the wire insertion holes 204 are electrically connected. The circuit board 400 has the conductor pattern formed on the side facing the base substrate 200, and a light reflecting layer (not shown) made of a metal layer or a white resist layer is formed on the other surface side. Has been.

  In the present embodiment, the plurality of light emitting devices 1 are connected in series. However, the connection relationship between the plurality of light emitting devices 1 is not particularly limited. For example, the light emitting devices 1 may be connected in parallel or connected in series. And parallel connection may be combined.

  As shown in FIGS. 6 to 8, the light emitting device 1 is a dome-shaped optical member that controls the light distribution of the light emitted from the LED chip 10 in addition to the LED chip 10 and the mounting substrate 20 described above. An optical member 60 made of a translucent material fixed to one surface side (the upper surface side in FIG. 7B) of the mounting substrate 20 so as to house the LED chip 10 between the mounting substrate 20 and the optical member 60 A sealing portion made of a sealing resin that seals the LED chip 10 and the bonding wires 14 and 14 electrically connected to the LED chip 10 in a space surrounded by the mounting substrate 20. 50 and a phosphor and a translucent material that are excited by light emitted from the LED chip 10 and transmitted through the sealing portion 50 and the optical member 60 to emit light of a color different from the emission color of the LED chip 10. And a color conversion member 70 domed disposed in the form of gaps 80 are formed between the light exit surface 60b of the optical member 60 in the first surface side of the formed packaging substrate 20.

  The mounting substrate 20 is made of a heat conductive material, and a rectangular plate-shaped heat transfer plate 21 on which the LED chip 10 is mounted via a submount member 30 for thermal stress relaxation, and one surface side of the heat transfer plate 21 (FIG. 7). The wiring board 22 is laminated on the upper surface side in (b). As the above-described heat conductive material, Cu is adopted, but not limited to Cu, for example, Al may be adopted.

  The wiring board 22 is formed with a pair of lead patterns 23 and 23 for feeding power to the LED chip 10 on one surface side opposite to the heat transfer plate 21 side, and in a thickness direction at a portion corresponding to the submount member 30. It is composed of a glass epoxy (FR4) substrate in which a rectangular window hole 24 penetrating is formed, and heat generated in the LED chip 10 is transferred to the submount member 30 and the heat transfer plate 21 without passing through the wiring substrate 22. It can be heated. In addition, the material of the insulating base material of the wiring board 22 is not limited to a glass epoxy resin such as FR4, and may be, for example, a polyimide resin or a phenol resin.

  Each lead pattern 23, 23 of the wiring board 22 is composed of a laminated film of a Cu film, a Ni film, and an Au film formed on the one surface side of the glass epoxy board. A warp preventing metal film (not shown) is formed on the other surface side of the wiring board 22, and the heat transfer plate 21 and the wiring board 22 are made of a sheet-like adhesive film 28 (FIGS. 7 and 8). For fixing). The warp preventing metal film is composed of a Cu film.

  Further, the wiring board 22 is provided with protruding pieces 22b and 22b protruding laterally from the central portions of the left and right side edges in FIG. 9, and an overvoltage is applied to the LED chip 10 on one protruding piece 22b. A pair of diode-connecting lands 124 and 124 for connecting a surface-mounted Zener diode 131 (see FIG. 6) for preventing overvoltage is formed, and the other protruding piece 22b is surface-mounted. A pair of capacitor connection lands 126 and 126 for enabling connection of the capacitor 132 of the type (see FIG. 6) is formed. Here, the diode connection lands 124 and 124 and the capacitor connection lands 126 and 126 are formed on the same plane as the lead patterns 23 and 23 on the wiring board 22, and the wiring board 22 has a diode connection land. First wiring conductor patterns 123 and 123 (see FIG. 9) for connecting the lands 124 and 124 and the lead patterns 23 and 23 are formed, and the capacitor connecting lands 126 and 126 and the lead patterns 23 and 23 are connected to each other. Second wiring conductor patterns 125 and 125 (see FIG. 9) to be connected are formed.

  Further, the wiring board 22 has a resist layer 26 made of a white resin laminated on the surface side opposite to the heat transfer plate 21 side, and the resist layer 26 is an inner lead portion 23 a of each lead pattern 23, 23. , 23a and outer lead portions 23b, 23b, each of the diode connection lands 124, 124, and each of the capacitor connection lands 126, 126 are exposed. Here, the circuit board 400 is provided with a rectangular window hole 408 (see FIG. 6) through which the Zener diode 131 is inserted in a portion corresponding to the Zener diode 131, and the capacitor 132 is inserted in a portion corresponding to the capacitor 132. A rectangular window hole 409 (see FIG. 6) is provided, and a structure in which a Zener diode 131 and a capacitor 132 for preventing electrostatic breakdown of the LED chip 10 as the light emitting device 1 are mounted on the wiring board 22 is adopted. However, it is possible to prevent the distance between the base substrate 200 and the circuit board 400 from becoming long, and the light source unit A can be thinned.

  The LED chip 10 is a GaN-based blue LED chip that emits blue light, and is a conductive substrate made of an n-type SiC substrate that has a lattice constant and a crystal structure close to GaN as a crystal growth substrate and has conductivity compared to a sapphire substrate. The light emitting unit 12 (see FIG. 8) is used, which is formed of a GaN-based compound semiconductor material on the main surface side of the conductive substrate 11 and has, for example, a double structure. ) Is grown by an epitaxial growth method (for example, MOVPE method), a cathode electrode (n electrode) which is a cathode side electrode (not shown) is formed on the back surface of the conductive substrate 11, and the surface of the light emitting unit 12 (conductive substrate 11). An anode electrode (p electrode), which is an electrode on the anode side (not shown), is formed on the outermost surface on the main surface side. In short, the LED chip 10 has an anode electrode formed on one surface side and a cathode electrode formed on the other surface side. The cathode electrode and the anode electrode are composed of a laminated film of a Ni film and an Au film, but the material of the cathode electrode and the anode electrode is not particularly limited, and a material capable of obtaining good ohmic characteristics For example, Al or the like may be employed.

  In the present embodiment, the light emitting unit 12 of the LED chip 10 is mounted on the heat transfer plate 21 so as to be on the side farther from the heat transfer plate 21 than the conductive substrate 11. The heat transfer plate 21 may be mounted so that 12 is closer to the heat transfer plate 21 than the conductive substrate 11. In consideration of the light extraction efficiency, it is desirable to arrange the light emitting unit 12 on the side away from the heat transfer plate 21, but in this embodiment, the conductive substrate 11 and the light emitting unit 12 have the same refractive index. Therefore, even if the light emitting unit 12 is disposed on the side closer to the heat transfer plate 21, the light extraction loss does not become too large.

  Further, the LED chip 10 is formed in a rectangular plate shape larger than the chip size of the LED chip 10, and stress acting on the LED chip 10 due to the difference in linear expansion coefficient between the LED chip 10 and the heat transfer plate 21. It is mounted on the heat transfer plate 21 via the above-described submount member 30 to be relaxed.

  The submount member 30 has not only a function of relieving the stress but also a heat conduction function of transferring heat generated in the LED chip 10 to a range wider than the chip size of the LED chip 10 in the heat transfer plate 21. Yes. In the present embodiment, AlN having a relatively high thermal conductivity and insulation is used as the material of the submount member 30, and the LED chip 10 has the cathode electrode on the LED chip 10 side of the submount member 30. A conductive pattern 31 (see FIG. 10) provided on the surface and connected to the cathode electrode and electrically connected to one lead pattern 23 via a bonding wire 14 made of a fine metal wire (for example, a gold fine wire, an aluminum fine wire, etc.) The anode electrode is electrically connected to the other lead pattern 23 via the bonding wire 14. The LED chip 10 and the submount member 30 may be bonded using, for example, solder such as SnPb, AuSn, SnAgCu, or silver paste, but may be bonded using lead-free solder such as AuSn, SnAgCu. It is preferable.

  Further, as shown in FIG. 10, the submount member 30 is formed with a reflective film 32 that reflects light emitted from the LED chip 10 around the conductor pattern 31. The thickness dimension of the submount member 30 is set so that the surface of the reflective film 32 is farther from the heat transfer plate 21 than the one surface of the wiring board 22 (the surface of the resist layer 26). Therefore, the light emitted from the side surface of the LED chip 10 can be prevented from being absorbed by the submount member 30 and the wiring board 22, and the light output can be improved by improving the light extraction efficiency to the outside. The reflective film 32 is composed of a laminated film of a Ni film and an Ag film. Further, the reflective film 32 is divided into two regions in order to prevent the two electrodes of the LED chip 10 from being short-circuited via the reflective film 32 when the bonding wires 14 and 14 are in contact with each other. Insulating and separating slits 33 are formed.

  Here, the LED chip 10 and the submount member 30 each have a rectangular planar shape (in this embodiment, a square shape), and the LED chip 10 has a pair of diagonal lines of the submant member 30 on each side in plan view. Is disposed at the central portion of the submount member 30 so as to intersect one of the diagonal lines, the light emitted from each side surface of the LED chip 10 to the submount member 30 side is efficiently reflected by the reflective film 32. The light output can be reflected and the light output can be improved by improving the light extraction efficiency to the outside. In the present embodiment, the LED chip 10 and the submant member 30 have substantially the same center axis along the thickness direction, and each side in the plan view of the LED chip 10 is the one diagonal line of the submount member 30. And an angle of about 45 degrees.

  The material of the submount member 30 is not limited to AlN, and any material may be used as long as the linear expansion coefficient is relatively close to 6H—SiC that is the material of the conductive substrate 11 and the heat conductivity is relatively high. Si or the like may be employed. In this embodiment, since the LED chip 10 is mounted on the heat transfer plate 21 via the submount member 30, the heat generated by the LED chip 10 is efficiently radiated via the submount member 30 and the heat transfer plate 21. In addition, the stress acting on the LED chip 10 due to the difference in linear expansion coefficient between the LED chip 10 and the heat transfer plate 21 can be reduced.

  As the sealing resin that is the material of the sealing portion 50 described above, a silicone resin is used. However, the sealing resin is not limited to the silicone resin, and for example, an acrylic resin may be used.

  The optical member 60 is a molded product of a translucent material (for example, silicone resin) and is formed in a dome shape. Here, in this embodiment, since the optical member 60 is formed of a silicone resin molded product, the difference in refractive index and the linear expansion coefficient between the optical member 60 and the sealing portion 50 can be reduced. In addition, when the material of the sealing part 50 is an acrylic resin, it is preferable to form the optical member 60 also with an acrylic resin.

  By the way, the optical member 60 has a light emitting surface 60b formed in a convex curved surface shape that does not totally reflect light incident from the light incident surface 60a at the boundary between the light emitting surface 60b and the gap 80 described above. Here, the optical member 60 is formed such that the light emitting surface 60b is formed by a part of a spherical surface, and the center of the spherical surface is located on the center line of the light emitting unit 12 along the thickness direction of the LED chip 10. ing. In other words, the optical member 60 is disposed so that the optical axis of the optical member 60 is located on the center line of the light emitting unit 12 along the thickness direction of the LED chip 10. Therefore, the light emitted from the LED chip 10 and incident on the light incident surface 60a of the optical member 60 can easily reach the color conversion member 70 without being totally reflected at the boundary between the light emitting surface 60b and the gap 80. The luminous flux can be increased. The light emitted from the side surface of the LED chip 10 propagates through the sealing portion 50, the optical member 60, and the gap 80 to reach the color conversion member 70 to excite the phosphor of the color conversion member 70 or to the phosphor. The color conversion member 70 is transmitted without colliding. Moreover, the optical member 60 is formed so that thickness may become uniform along a normal direction irrespective of a position, and the above-mentioned sealing part 50 is formed in the hemispherical shape.

  The color conversion member 70 is a mixture of a translucent material such as a silicone resin and a particulate yellow phosphor that emits broad yellow light when excited by the blue light emitted from the LED chip 10. It is comprised by the molded article (that is, the color conversion member 70 is formed with the translucent material and fluorescent substance). Therefore, in the light emitting device 1 in the present embodiment, the blue light emitted from the LED chip 10 and the light emitted from the yellow phosphor are emitted through the outer surface 70b of the color conversion member 70 to obtain white light. Can do. The translucent material used as the material of the color conversion member 70 is not limited to a silicone resin, but an organic / inorganic hybrid in which, for example, an acrylic resin, glass, an organic component and an inorganic component are mixed and combined at the nm level or the molecular level. Materials etc. may be adopted. Further, the phosphor mixed with the translucent material used as the material of the color conversion member 70 is not limited to the yellow phosphor. For example, white light can be obtained by mixing a red phosphor and a green phosphor.

  Here, in the color conversion member 70, the radius of curvature of the inner surface 70a of the color conversion member 70 is set to be slightly larger than the radius of curvature of the light emitting surface 60b of the optical member 60, and the top of the color conversion member 70 and the optical member The distance between the light emitting surface 60b of the optical member 60 and the light emitting surface 60b of the optical member 60 gradually increases as the distance from the apex portion increases. The proximity of the top of the color conversion member 70 and the light emitting surface 60b of the optical member 60 means that the top of the color conversion member 70 and the light emitting surface 60b of the optical member 60 are in contact with each other. This is a concept including both of the case where the top part and the light emitting surface 60b of the optical member 60 are not close to each other. In the illustrated example, the former case is shown. The color conversion member 70 is formed so that the thickness along the normal direction is uniform regardless of the position.

  By the way, the color conversion member 70 has a shape as shown in FIG. 11, and has a plurality of (this book) having locking claws 71 a protruding from the edge on the mounting substrate 20 side to the mounting substrate 20 side and protruding outward at the tip portion. In the embodiment, four mounting legs 71 are provided apart from each other in the circumferential direction of the edge, and the mounting substrate 20 is a plurality of recesses into which the mounting legs 71 are inserted on the one surface side. A plurality of recesses 27 having locking surfaces to which the locking claws 71a are locked are formed. In short, in the light emitting device 1, the locking claws 71 a provided at the tip ends of the plurality of mounting legs 71 projecting from the edge of the color conversion member 70 on the mounting substrate 20 side to the mounting substrate 20 side have the above-mentioned of the mounting substrate 20. It is locked to the locking surface of the recess 27 formed on one surface. Here, the recess 27 is formed on the wiring substrate 22 in the thickness direction around the window hole 24 in the thickness direction and on the one surface side of the heat transfer plate 21 and communicates with the through hole 27a. In addition, a circular concave groove 27b having an opening area larger than that of the through hole 27a is formed, and a surface of the wiring board 22 facing the concave groove 27b constitutes the locking surface. Therefore, in the light emitting device 1 of this embodiment, the recess 27 in the mounting substrate 20 can be easily formed.

  In the light emitting device 1 according to the present embodiment, the thickness of the submount member 30 is set so that the surface of the reflective film 32 is more heat-conductive plate 21 than the one surface of the wiring substrate 22 (the surface of the resist layer 26) as described above. The thickness dimension is set so that the surface of the reflective film 32 is positioned farther from the heat transfer plate 21 than the edge of the color conversion member 70 on the mounting substrate 20 side. Even when a gap is formed between the edge of the color conversion member 70 and the one surface of the mounting substrate 20, the light emitted from the LED chip 10 to the side is between the color conversion member 70 and the mounting substrate 20. The light emitted from the gap can be prevented (that is, the blue light emitted from the LED chip 10 can be prevented from being emitted outside without passing through the color conversion member 70).

  In the light emitting device 1 described above, since the color conversion member 70 is disposed in a form in which a gap 80 is formed between the light emitting surface 60b of the optical member 60 on the one surface side of the mounting substrate 20, color conversion is performed. The stress generated in the color conversion member 70 when an external force is applied to the member 70 can be suppressed from being transmitted to the LED chip 10 and the bonding wires 14, 14. 14 is less likely to occur, and the reliability is increased. Further, the top of the color conversion member 70 is in contact with the light emitting surface 60b of the optical member 60, and the color conversion member 70 is mounted from the edge on the mounting substrate 20 side. Since the locking claws 71 a provided at the distal ends of the plurality of mounting legs 71 projecting toward the substrate 20 are locked to the locking surfaces of the recesses 27 formed on the one surface of the mounting substrate 20. Due to the heat generation, such as an LED chip 10 can be an optical member 60 and the color conversion member 70 is also gelatinous sealing portion 50 is softened to prevent the falling, is reliable.

  By the way, the window hole 403 of the circuit board 400 is formed in a circular shape having an opening size through which the color conversion member 70 of the light-emitting device 1 can be inserted. A through-hole wiring 407 (see FIG. 6) for electrically connecting the conductor pattern of the circuit board 400 and each outer lead portion 23b of the light emitting device 1 is formed. Each through-hole wiring 407 is formed across the inner surface of the through-hole penetrating in the thickness direction of the circuit board 400 and the periphery of the through-hole on both surfaces of the circuit board 400. The conductor pattern is connected to the surface side.

  Here, the formation position of each pair of through-hole wirings 407 formed in the peripheral part of each window hole 403 in the circuit board 400 is shifted from the projection region of the outer lead part 23 b of the mounting board 20. Specifically, the formation positions of each pair of through-hole wirings 407 are designed to overlap two of the four corners of the wiring board 22 of the light emitting device 1.

  In addition, the light emitting device 1 according to the present embodiment includes a pair of wiring patterns 151 and 151 that are disposed between the mounting substrate 20 and the circuit substrate 400 and serve as an electric path between the lead patterns 23 and 23 and the conductor pattern. Flexible printed wiring boards 150, 150.

  In the wiring patterns 151 and 151 of the flexible printed wiring boards 150 and 150, U-shaped first bonding pattern portions 151 a are formed in portions overlapping the outer lead portions 23 b and 23 b, and portions overlapping the through-hole wiring 407. A circular second bonding pattern portion 151b is formed on the outer lead portion 23b, and the outer lead portion 23b and the first bonding pattern portion 151a are bonded via a first bonding portion (not shown) made of solder. Thus, the through-hole wiring 407 and the second bonding pattern portion 151b are bonded and electrically connected via a second bonding portion (not shown) made of solder. In addition, the planar shape of each flexible printed wiring board 150, 150 is formed in a curved shape.

  In the LED module 2 in the present embodiment, the flexible printed wiring boards 150 and 150 are formed at the joint between the lead pattern 23 and the conductor pattern due to the difference in linear expansion coefficient between the base substrate 200 and the circuit substrate 400. Since it functions as a stress relaxation means for relaxing the working stress, the connection reliability between each light emitting device 1 and the circuit board 400 can be enhanced.

  Further, the above-described cover member 3 is formed of a molded product of a translucent material (for example, acrylic resin, glass, etc.), and is disposed apart from the base substrate 200 on the one surface side of the base substrate 200. A front plate portion 3a and an annular side plate portion 3b that protrudes continuously and integrally from the periphery of the front plate portion 3a toward the one surface side of the base substrate 200 are provided. Here, the base substrate 200 is formed with two screw insertion holes 217 through which a fixing screw 119 for fixing the cover member 3 is inserted, and the cover member 3 is formed from the other surface side of the base substrate 200. Two boss portions 3c having a screw hole 3d into which a tip end portion of a fixing screw 119 inserted through the screw insertion hole 217 of the base substrate 200 is screwed are integrally formed. In the cover member 3, each lens 301 is continuously formed integrally with the above-described front plate portion 3 a, and the one surface side of the base substrate 200 is formed such that each lens 301 coincides with the optical axis of each light-emitting device 1. Placed in.

  Each lens 301 in the cover member 3 described above is formed in a convex shape toward the light emitting device 1 and houses at least a part of the light emitting device 1 (in this embodiment, the color conversion member 70) at the tip. A recess 302 is formed, and a function of directly guiding light incident from the inner bottom surface 302 a of the recess 302 to the light exit surface 301 b of the lens 301, and light incident from the inner surface 302 b of the recess 302. It is designed to have a function of reflecting on the outer surface 301c of the lens and guiding it to the light emitting surface 301b of the lens 301, and from the plane including the surface facing the base substrate 200 in the front plate portion 3a of the cover member 3. The outer diameter gradually decreases as it approaches the substrate 200. Further, the light exit surface 301b of each lens 301 has a central portion formed in a convex curved surface shape and a peripheral portion formed in a flat shape. Depending on the structure of the light emitting device 1, the entire light emitting device 1 may be stored in the recess 302 of the lens 301.

  By the way, the light source unit A in the present embodiment prevents the light leaking from the outer surface 301c of one lens 301 of the adjacent lenses 301 from reaching the other lens 301 and reflects it to the one lens 301 side. The reflecting structure 5 is provided in a space surrounded by the circuit board 400 and the cover member 3 of the LED module 2 (note that a broken line in FIG. 1B indicates one lens of the adjacent lenses 301). 301 shows a propagation path of light leaking from the outer surface 301c of 301).

  The reflecting structure 5 is, for example, a molded product made of a fluororesin such as Teflon (registered trademark), is formed in a disc shape, and has four columnar legs protruding toward the base substrate 200 side. The portions 500a are formed at substantially equal intervals in the circumferential direction, and a plurality of circular openings 501 into which the respective lenses 301 of the cover member 3 are inserted are provided, and the inner surface of the openings 501 is A light reflecting surface that reflects light leaking from the outer surface 301 c of the lens 301 is configured. Note that notches 503 (see FIG. 4) are formed at portions corresponding to the respective boss portions 3 c of the cover member 3 in the peripheral portion of the reflecting structure 5. In addition, the base substrate 200 of the light source unit A is provided with two screw holes 215 (see FIG. 4) into which two mounting screws (not shown) inserted through the bottom wall of the lamp body 100 are screwed. A cutout portion 504 is formed in a portion corresponding to each screw hole 215 of the base substrate 200 in the peripheral portion of the reflecting structure 5. Further, a through hole 502 is formed in the central portion of the reflecting structure 5. Further, a notch 405 (see FIGS. 1A and 4) is formed in a portion of the circuit board 400 corresponding to each leg 500a of the reflecting structure 5.

  In the lighting fixture of the present embodiment described above, light leaking from the outer surface 301 c of one lens 301 of the adjacent lens 301 is prevented from reaching the other lens 301 in the light source unit A, and the one lens 301 described above. Since the reflecting structure 5 that reflects to the side is provided, the light leaking from the outer surface 301c of one lens 301 of the adjacent lenses 301 enters the other lens 301 and irradiates the inner surface of the lamp body 100. (A broken line in FIG. 1B indicates a propagation path of light leaking from the outer surface 301c of one lens 301) and can be returned to the one lens 201 side. As a result, the aesthetics in the lighting state can be enhanced, and the light extraction efficiency from the lamp body 100 can be enhanced.

  Here, as shown in FIG. 12, if the light reflecting surface formed by the inner surface of the opening 501 of the reflecting structure 5 is formed in a shape along the outer surface 301 c of the lens 301, the light from the lamp main body 100 can be obtained. The extraction efficiency can be further increased. Moreover, since the insulating material excellent in heat resistance and electrical insulation, such as a fluororesin, is used as the material of the reflecting structure 5, the reliability can be improved. In the present embodiment, the light leaked from the outer surface 301c of each lens 301 can be reflected by one reflecting structure 5, but a frame-like reflecting structure 5 is provided for each lens 301. The inner surface of the frame-like reflecting structure 5 may be a light reflecting surface. Moreover, in this embodiment, although the fluororesin is used as the material of the reflective structure 5, the material of the reflective structure 5 may be a material other than the fluororesin.

  By the way, in above-mentioned embodiment, although the downlight was illustrated as a lighting fixture, the technical idea of this invention is applicable not only to a downlight but another lighting fixture.

  Further, in the above-described embodiment, a blue LED chip whose emission color is blue is adopted as the LED chip 10 and a SiC substrate is adopted as the conductive substrate 11, but a GaN substrate is used instead of the SiC substrate. In the case of using a SiC substrate or a GaN substrate, the crystal growth substrate has a higher thermal conductivity than the case of using a sapphire substrate as an insulator as the crystal growth substrate. Thermal resistance can be reduced. Further, the light emission color of the LED chip 10 is not limited to blue, and may be, for example, red or green. That is, the material of the light-emitting portion 12 of the LED chip 10 is not limited to the GaN-based compound semiconductor material, and a GaAs-based compound semiconductor material, a GaP-based compound semiconductor material, or the like may be employed according to the emission color of the LED chip 10. Further, the conductive substrate 11 is not limited to the SiC substrate, and may be appropriately selected from, for example, a GaAs substrate and a GsP substrate according to the material of the light emitting unit 12. Further, when the difference in linear expansion coefficient between the LED chip 10 and the mounting substrate 20 is relatively small, the submount member 30 is not necessarily provided. In addition, when white light can be obtained with the LED chip 10 alone, a dome-shaped protective member made of a translucent material is used instead of the color conversion member 70 made of phosphor and the translucent material. do it.

  Further, in the light emitting device 1 described above, the LED chip 10 having a chip size of 1 mm □ is used and one LED chip 10 is arranged on the submount member 30, but the chip size and number of the LED chips 10 are different. There is no particular limitation, and for example, a plurality of (eight in the illustrated example) LEDs are provided on one submount member 30 by adopting an LED chip 10 having a chip size of 0.3 mm □. The chip 10 may be disposed, and the plurality of LED chips 10 may be connected in series via the conductor pattern 31 and a bonding wire (not shown).

  In the above-described embodiment, the light emitting device 1 includes the pair of flexible printed wiring boards 150 and 150. However, the circuit board 400 is formed using a terminal board or the like without providing the pair of flexible printed wiring boards 150 and 150. And may be electrically connected. Further, the Zener diode 131 and the capacitor 132 may be mounted on the circuit board 400 instead of the mounting board 20.

The lighting fixture of embodiment is shown, (a) is principal part schematic sectional drawing, (b) is operation | movement explanatory drawing. It is a schematic perspective view of a lighting fixture same as the above. It is a schematic bottom view of a lighting fixture same as the above. It is a general | schematic disassembled perspective view of the light source unit in a lighting fixture same as the above. It is a schematic perspective view of the light source unit in a lighting fixture same as the above. It is a principal part disassembled perspective view of the LED module in a lighting fixture same as the above. The light-emitting device in a lighting fixture same as the above is shown, (a) is a schematic plan view, (b) is an A-B-C-D-E schematic sectional view of (a). It is a principal part schematic sectional drawing of the LED module in a lighting fixture same as the above. It is a principal part schematic plan view of the light-emitting device in a lighting fixture same as the above. It is a schematic perspective view of the submount member of the light-emitting device in the lighting fixture same as the above. The color conversion member of the light-emitting device in a lighting fixture same as the above is shown, (a) is a partially broken front view, and (b) is a bottom view. It is a principal part schematic sectional drawing which shows the other structural example of the light source unit in a lighting fixture same as the above. It is a schematic exploded perspective view of the light source unit in the lighting fixture which shows a prior art example. It is a schematic perspective view of the lighting fixture which shows a prior art example. It is operation | movement explanatory drawing of a lighting fixture same as the above. It is operation | movement explanatory drawing of a lighting fixture same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light-emitting device 2 LED module 3 Cover member 5 Structure for reflection 100 Lamp main body 102 Opening window 200 Base substrate 301 Lens 301b Light-emitting surface 301c Outer side surface 302 Recessed portion 302b Inner side surface

Claims (2)

  A plurality of light emitting devices using LED chips are provided with an LED module arranged on one surface side of a base substrate, and a lamp body in which the LED module is housed and arranged, and the LED module is retracted from an opening window of the lamp body. And a reflecting structure for suppressing a part of light from each light-emitting device from being irradiated on the inner surface of the lamp body on the one surface side of the base substrate. A luminaire characterized by being provided.   A cover member provided with a lens for controlling the orientation of light emitted from the light emitting device at each of the portions surrounding the light emitting devices on the one surface side of the base substrate and facing the light emitting devices; Each lens is formed in a shape that is convex toward the light emitting device, and a recess that houses at least a part of the light emitting device is formed at a tip portion. The reflecting structure includes the LED module and the light emitting device. The light provided from the outside of one lens of adjacent lenses is prevented from reaching the other lens and is reflected toward the one lens side. The luminaire described.

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