JP2013179202A - Light emitting device and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit unpleasant glare and the deterioration of heat radiation performance.SOLUTION: Multiple louvers 53 are integrally formed with a cover 5. Deflection inhibition parts 530, having different distances from a light source part 1, are provided in portions of the louvers 53 that face the light source part 1. Even if a mount substrate 10 is deflected by heat emitted from an LED chip, the mount substrate 10 contacts with the deflection inhibition parts 530 thereby inhibiting the deflection (warpage) of the mounting substrate 10. As a result, the structure inhibits the deterioration of heat radiation performance due to the decrease of a contact area between the mounting substrate 10 and a protruding part 22 of the radiation member 2.

Description

  The present invention relates to a light emitting device using a light emitting diode as a light source, and a lighting fixture using the light emitting device.

  In recent years, light-emitting diodes (LEDs) have been used as illumination light sources in place of fluorescent lamps and incandescent lamps. The LED generates heat during light emission, but as the temperature rises, the light emission efficiency decreases and the lifetime also shortens. Therefore, in a light emitting device using an LED as a light source, it is important to radiate heat generated by the LED to suppress an increase in temperature. Therefore, in the conventional light emitting device, heat dissipation is improved by bringing a heat dissipation member into contact with the substrate on which the LED is mounted.

  In addition, since LEDs have a higher light directivity than fluorescent lamps and incandescent lamps, and are light sources with high brightness and low solid angle, countermeasures against discomfort glare are required. For example, Patent Document 1 describes a lighting fixture in which a number of LEDs are mounted on the surface of a long substrate, and discomfort glare is suppressed by disposing louvers between the individual LEDs. .

JP 2011-249222 A

  By the way, when a long board | substrate bends along a longitudinal direction with the heat | fever which LED emits, there exists a possibility that a clearance gap may arise between a board | substrate and a thermal radiation member, and heat dissipation may fall.

  The present invention has been made in view of the above problems, and an object thereof is to suppress unpleasant glare and heat dissipation.

  The light-emitting device of the present invention includes a light source unit in which one or more light-emitting diodes are mounted on a surface of a mounting board formed in a long plate shape, and at least a part of the mounting board along the longitudinal direction. A heat dissipating member that contacts the back surface, a cover that covers the mounting substrate and the heat dissipating member in a direction that faces the window hole in a long box shape with a window hole opened in the bottom wall, and the light source One or more louvers that block or change the optical path of a part of the light emitted from the portion through the window hole, and the louver is bent to oppose the surface of the mounting board and suppress the bending of the mounting board. It has the suppression part.

  In the light emitting device, it is preferable that the mounting substrate has a conductive pattern for supplying power to the light emitting diode formed on the surface, and the louver has an escape portion for escaping the conductive pattern.

  The lighting fixture of this invention is equipped with the said light-emitting device and the fixture main body holding the said light-emitting device, It is characterized by the above-mentioned.

  In the light emitting device and the lighting fixture of the present invention, since the louver has a deflection suppressing portion that opposes the surface of the mounting substrate and suppresses the bending of the mounting substrate, even if the mounting substrate is bent by the heat generated by the light emitting diode, The flexure suppression part suppresses the flexure (warp) of the mounting board, and as a result, there is an effect that it is possible to suppress a reduction in heat dissipation due to a reduction in the contact area between the mounting board and the heat dissipation member and a reduction in discomfort glare. .

It is sectional drawing which shows embodiment of the light-emitting device based on this invention. It is an exploded perspective view same as the above. It is a disassembled perspective view in which a part was omitted. It is sectional drawing same as the above. It is sectional drawing same as the above. It is sectional drawing abbreviate | omitted partially same as the above. It is a perspective view of the cover in the same as the above. The cover in the same as above is shown, (a) is a front view, (b) is a bottom view, (c) is a rear view, (d) is a left side view, and (e) is a right side view. It is a perspective view of the cover in the same as the above. The cover in the same as above is shown, (a) is a front view, (b) is a bottom view, (c) is a rear view, (d) is a left side view, and (e) is a right side view. It is a perspective view of the panel in the same as the above. The panel in the above is shown, (a) is a front view, (b) is a bottom view, (c) is a rear view, (d) is a left side view, and (e) is a right side view. It is a perspective view of the panel in the same as the above. The panel in the above is shown, (a) is a front view, (b) is a bottom view, (c) is a rear view, (d) is a left side view, and (e) is a right side view. It is the disassembled perspective view which abbreviate | omitted a part of the cover and panel in the same as the above. It is a cross-sectional perspective view abbreviate | omitted partially in the same as the above. It is a cross-sectional perspective view abbreviate | omitted partially in the same as the above. It is a perspective view which shows embodiment of the lighting fixture which concerns on this invention.

  Hereinafter, embodiments of a light emitting device according to the present invention will be described in detail with reference to the drawings. The light-emitting device (LED unit) of this embodiment is provided with the light source part 1, the heat radiating member 2, the insulating member 3, the attachment member 4, the cover 5, the receptacle connector 6, the panel 7, etc. as shown in FIGS.

  The light source unit 1 includes a mounting board 10 formed in a long plate shape with an insulating material (for example, ceramic), a plurality of light emitting diodes (hereinafter referred to as LED chips) mounted on the surface of the mounting board 10, and the like. A conductive pattern (not shown) formed on the surface of the mounting substrate 10 is included. A plurality of LED chips (not shown) are mounted on the central portion (the central portion in the short direction) of the surface of the mounting substrate 10 in a line at equal intervals along the longitudinal direction, and have translucency and It is sealed with a sealing member 12 such as a silicone resin mixed with a phosphor. That is, a part of the light emitted from the LED chip (for example, blue light) is wavelength-converted by the phosphor, and the wavelength-converted light (for example, yellow light) and the light that has not been wavelength-converted (blue light) are mixed. Thus, the light emitted from the light source unit 1 becomes white light as a whole. The connectors 13 are mounted in the vicinity of both ends in the longitudinal direction on the surface of the mounting substrate 10, respectively. These connectors 13 are connected to the respective LED chips via conductive patterns formed on the surface of the mounting substrate 10 (see FIG. 2). A mating connector (not shown) connected to these connectors 13 is connected to the receptacle connector 6 by electric wires (not shown).

  The heat radiating member 2 is formed in a long flat plate shape, and the main piece 20 on which the light source unit 1 is placed via the insulating member 3 and the main piece 20 from both ends (both ends in the longitudinal direction) of the main piece 20. A pair of side pieces 21 extending in the thickness direction are integrally formed of a material having high thermal conductivity (for example, an aluminum plate). In addition, on one surface of the main piece 20 (the surface on which the light source unit 1 is mounted; hereinafter referred to as a mounting surface), a plurality of protrusions 22 protruding in a direction approaching the light source unit 1 are longitudinal. It protrudes along. A plurality of attachment pieces 23 projecting inward are integrally formed at the edge of each side piece 21. The heat dissipating member 2 and the attachment member 4 are mechanically coupled by caulking claws 44 described later to the attachment pieces 23.

  The insulating member 3 rises in a direction approaching the light source part 1 from the main part 30 interposed between the main piece 20 of the heat radiating member 2 and the light source part 1 and both ends (both ends along the longitudinal direction) of the main part 30. The contact portion 31 and a pair of reflecting portions 32 protruding from the tip of each contact portion 31 are integrally formed as a synthetic resin molded body. The pair of reflecting portions 32 are inclined so as to open outward as they move away from the contact portion 31, and the surface on the side facing the light source portion 1 (upper surface in FIG. 1) becomes a reflecting surface and is emitted from the light source portion 1. The light is reflected forward (upward in FIG. 1). Further, in the state where the insulating member 3 is placed on the main piece 20 of the heat radiating member 2, a long hole-like insertion hole 33 through which the protruding portion 22 is inserted passes through the center of the main portion 30. However, the insulating member 3 includes a member disposed at both ends in the longitudinal direction of the heat radiating member 2 and a member disposed other than both ends (see FIGS. 2 and 3). And the insulating member 3 arrange | positioned at the both ends of the longitudinal direction of the heat radiating member 2 has the wall part 34 which plugs up the edge part of the heat radiating member 2 protrudingly provided in the one end side of a longitudinal direction, and a pair of contact part 31 A second contact portion 35 that connects both ends is formed.

  The insulating member 3 has a plurality of protrusions 36 that are respectively inserted into a plurality of caulking holes 20 </ b> A provided in the main piece 20 of the heat radiating member 2. The protrusions 36 are formed in a cylindrical shape that protrudes from both ends in the short direction (left and right direction in FIG. 3) toward the main piece 20 of the heat radiating member 2 (upward in FIG. 3), along the longitudinal direction, etc. Arranged at intervals. Thus, the projections 36 are respectively inserted into the caulking holes 20A provided in the main piece 20, and the protrusions 22 are inserted into the insertion holes 33 of the main part 30, so that the main piece 20 of the heat radiating member 2 is inserted. The insulating member 3 is positioned with respect to. Then, the insulating member 3 is attached to the heat radiating member 2 by heat caulking the projection 36 inserted into the caulking hole 20A. Further, a columnar protrusion 37 protruding in the opposite direction to the protrusion 36 (downward in FIG. 2) is formed integrally with each protrusion 36. Then, the light source unit 1 is attached to the insulating member 3 by the caulking of the protrusion 37. However, in the present embodiment, one light source unit 1 is attached so as to straddle two insulating members 3.

  The attachment member 4 is integrally formed by bending a metal plate such as a steel plate into a long rectangular bottom plate 40 and a pair of side plates 41 rising from both ends along the longitudinal direction (front-rear direction) of the bottom plate 40. It is formed in the shape of a square hook. At both ends in the longitudinal direction of the bottom plate 40, a pair of fixing grooves 40A into which fixing claws (not shown) of a mounting bracket 43 described later are inserted are formed. Further, the bottom plate 40 is provided with two mounting holes 40B with the central portion in the longitudinal direction interposed therebetween. Each mounting hole 40B penetrates in the thickness direction, and an internal thread is formed on the inner peripheral surface thereof. These attachment holes 40B are used when attaching the light emitting device of the present embodiment to an instrument body (described later).

  The receptacle connector 6 is attached to the attachment member 4 using an attachment fitting 43 (see FIG. 2). The receptacle connector 6 is connected to an electric wire (not shown) connected to a mating connector plugged into the connector 13 of the light source unit 1 and connected to a lighting device (not shown) via the electric wire. Plug connector is plugged in and inserted. That is, when the plug connector is plugged into the receptacle connector 6, the lighting device and the light source unit 1 are electrically connected, and power is supplied from the lighting device to the light source unit 1 so that the light source unit 1 emits light (lights up). .

  Each side plate 41 of the attachment member 4 is provided with caulking claws 44 that are caulked to the attachment pieces 23 of the heat radiation member 2 at both ends in the longitudinal direction. Each caulking claw 44 is formed in a rectangular shape by cutting out the side plate 41 of the mounting member 4. Therefore, when the caulking claw 44 is pressed outward by the tip of a jig such as a driver, the caulking claw 44 is caulked to the mounting piece 23 of the mounting member 2, and the heat radiating member 2 and the mounting member 4 are mechanically connected. (See FIG. 3).

  The cover 5 is formed in a long box shape having a bottom wall 50 and a side wall 51 surrounding the bottom wall 50 by a synthetic resin material having insulation properties such as polybutylene terephthalate (PBT) resin. In addition, when a long molded object is formed with a synthetic resin material, it becomes easy to bend by its own weight as the dimension in the longitudinal direction increases, and careful handling is required. Therefore, in this embodiment, the cover 5 is configured by forming a pair of cover members whose one end side in the longitudinal direction is opened by a synthetic resin molded body, and connecting these cover members to each other on the one end side. This facilitates handling of the cover 5 (cover member). However, in the following description, the cover member is referred to as a cover 5, and when distinguishing two types of cover members, one cover member is referred to as a cover 5A, and the other cover member is referred to as a cover 5B (FIGS. 7 to 5). 10).

  A rectangular and long window hole 500 is opened in the bottom wall 50 of the cover 5. In addition, a plurality of engagement recesses 52 are formed on the pair of side walls 51 along the longitudinal direction so that the plurality of engagement protrusions 21B formed on the side piece 21 of the heat radiating member 2 are detachably engaged. Yes. The cover 5 is formed so as to incline away from the side piece 21 of the heat radiating member 2 as the side wall 51 moves away from the bottom wall 50, so that the cover 5 is easily covered.

  In the present embodiment, a plurality of louvers 53 are formed integrally with the cover 5. The louver 53 is formed in a substantially trapezoidal shape when viewed from the longitudinal direction of the cover 5 so as not to interfere with the reflecting portion 32 and the light source portion 1 of the insulating member 30. Here, at a portion of the louver 53 that faces the light source unit 1, a deflection suppressing unit 530, a relief unit 531, and a recessed unit 532 having different distances from the light source unit 1 are provided in a step shape.

  The bending suppression unit 530 is a minute distance (for example, 0.2 mm) from the surface of the mounting substrate 10 of the light source unit 1 in the state where the cover 5 is attached to the heat radiating member 2 in the vicinity of both ends of the mounting substrate 10 in the short direction. Is provided apart. The recess 532 has a sufficient distance (for example, 1.0 mm) from the front end of the sealing member 12 of the light source unit 1 in a state where the cover 5 is attached to the heat radiating member 2 at the center in the short direction of the mounting substrate 10. Is provided apart. The escape portion 531 is a slight distance (for example, from the surface of the conductive pattern formed on the surface of the mounting substrate 10 in a state where the cover 5 is attached to the heat radiating member 2 between the deflection suppressing portion 530 and the concave portion 532. 0.5mm) apart. However, the louver 53 provided at a position facing the connector 13 of the light source unit 1 is omitted from the deflection suppressing portion 530 and the escape portion 531 in order to avoid interference with the connector 13 as shown in FIG. .

  Thus, even if the mounting substrate 10 is bent by the heat generated by the LED chip, the mounting substrate 10 is prevented from bending (warping) by hitting the bending suppressing portion 530. As a result, it is possible to suppress a decrease in heat dissipation due to a decrease in the contact area between the mounting substrate 10 and the protrusions 22 of the heat dissipation member 2. Note that the bending suppression unit 530 may contact the surface of the mounting substrate 10 in a state where the LED chip 12 does not generate heat, but when the mounting substrate 10 is bent, excessive stress is received from the bending suppression unit 530. Therefore, it is preferable to leave a minute gap.

  In addition, since the escape portion 531 is provided at a position facing the conductive pattern of the louver 53, it is possible to prevent the louver 53 from being damaged by hitting the conductive pattern and from receiving unnecessary stress from the louver 53. Since the distance between the escape portion 531 and the conductive pattern is larger than the distance between the deflection suppressing portion 530 and the mounting substrate 10, the escape portion 531 does not hit the conductive pattern even when the mounting substrate 10 is bent.

  Furthermore, the louver 53 is formed in a truncated pyramid shape whose width becomes narrower toward the light source unit 1 when viewed from the short side of the cover 5 (see FIG. 6). That is, when the louver is formed of a thin plate having a uniform thickness, the light reflected on the surface of the louver is applied to the illumination space and enters the glare zone, which may reduce the effect of suppressing unpleasant glare. is there. On the other hand, in this embodiment, since the width (thickness) of the louver 53 is gradually reduced toward the light source unit 1, the glare zone is entered even if the light reflected on the surface of the louver 53 is irradiated on the illumination space. It becomes difficult to suppress discomfort glare.

  In addition, the louver 53 has a convex curved surface at the tip that faces the light source 1 when viewed from the short side of the cover 5 (see FIG. 6). That is, if the tip of the louver 53 has a convex curved surface shape, the light emitted from the LED chip 12 is smaller than the case where the tip of the louver 53 is a flat surface parallel to the surface of the mounting substrate 10. It is possible to reduce the amount of light reflected by the tip portion and returning toward the light source unit 1. Note that the louver 53 has a rear end portion (a portion connected to the side wall 51 of the cover 5) farthest from the light source portion 1, and has an acute corner when viewed from the short side of the cover 5. Yes. Therefore, as compared with the case where the corner portion is formed in a curved surface, the light shielding angle can be increased, and the interval between the louvers 53 can be increased.

  The panel 7 is formed in a long rectangular plate shape using a synthetic resin material having translucency such as acrylic resin or polycarbonate resin, and is attached to the bottom wall 50 of the cover 5 to close the window hole 500. The configuration of panel 7A attached to one cover 5A is slightly different from that of panel 7B attached to the other cover 5B. However, since the basic configuration of the two types of panels 7A and 7B is the same, in the following description, when the two types of panels 7A and 7B are not distinguished, they will be referred to as a panel 7 (see FIGS. 11 to 14). ).

  The panel 7 is an inclined surface that is curved in an arc shape along the short-side direction, and both end surfaces along the longitudinal direction are inclined inward toward the light source unit 1. However, the inner surface of the window hole 500 of the cover 5 facing the both end surfaces along the longitudinal direction of the panel 7 is also an inclined surface (see FIGS. 4 and 5). Therefore, the light emitted from the light source unit 1 is difficult to be reflected on both end surfaces along the longitudinal direction of the panel 7 and the inner side surface along the longitudinal direction of the window hole 500 of the cover 5 and is irradiated over a wide range.

  Further, a plurality of engaging portions 70 are provided at equal intervals at both end edges along the longitudinal direction of the panel 7. These engaging portions 70 are formed of protrusions protruding outward from the end surface along the longitudinal direction of the panel 7 (see FIGS. 1 and 11 to 14).

  On the other hand, the cover 5 is provided with a plurality of engaged portions 501 that are engaged with the engaging portions 70 of the panel 7 on the inner bottom surface of the bottom wall 50 (FIGS. 1 and 8C, FIG. 10). (See (c)). These engaged portions 501 are formed of recesses provided on the bottom wall 50 of the cover 5. Thus, when the panel 7 is pushed into the window hole 500 of the cover 5, the side wall 51 of the cover 5 bends outward so that the engaging portion 70 engages with the engaged portion 501. In the panel 7, an engagement piece 71 that engages with the peripheral edge of the window hole 500 inside the bottom wall 50 protrudes from one end side in the longitudinal direction. Therefore, when the panel 7 is attached to the cover 5, the gap formed between the longitudinal end of the panel 7 and the cover 5 is closed by the engagement piece 71, so that foreign matters such as dust and insects are covered. 5 can be prevented from entering.

  By the way, the engaging portion 70 provided on one end side along the longitudinal direction and the engaging portion 70 provided on the other end side along the longitudinal direction are arranged at asymmetric positions in the short direction of the panel 7. (See FIG. 12 (a) and FIG. 14 (a)). That is, when the engaging portions 70 at both ends along the longitudinal direction are arranged at symmetrical positions in the short direction of the panel 7, the side walls 51 on both sides are opposite to each other at the same position in the longitudinal direction when the panel 7 is attached. It is necessary to bend in the direction. However, since the side walls 51 on both sides are connected by a plurality of louvers 53, it is difficult for the side walls 51 to bend in opposite directions at symmetrical positions in the longitudinal direction, and it is difficult to attach the panel 7 to the cover 5. End up. On the other hand, since it is easy for the side walls 51 to bend in opposite directions at an asymmetrical position in the short direction, there is an advantage that the panel 7 can be easily attached to the cover 5.

  Here, a gap is provided between the surface of the panel 7 facing the louver 53 and the surface of the louver 53 facing the panel 7 (see FIG. 1). When the tip of the louver 53 comes into contact with the panel 7, the tip of the louver 53 seen through the panel 7 becomes dark, and a shadow of the louver 53 is formed on the surface of the panel 7, so that it does not look good. On the other hand, if a gap is provided between the panel 7 and the louver 53, the light emitted from the light source unit 1 is emitted through the gap between the panel 7 and the louver 53. The tip of 53 becomes bright and it becomes difficult to make a shadow of louver 53. As a result, a decrease in appearance due to the louver 53 can be suppressed.

  Next, differences between the two types of covers 5A and 5B and the panels 7A and 7B will be described in detail. As shown in FIGS. 7 and 8, one cover 5A has a protruding portion 54 that protrudes along the longitudinal direction from one open end and fits into one open end of the other cover 5B. Louvers 53 are also provided on the protrusions 54 so as to be arranged at a predetermined pitch along the direction. In the other cover 5B, since the position of the engaged portion 501 and the position of the louver 53 overlap in the longitudinal direction, in order to avoid the engaged portion 501, the louver 53 closest to the opened one end side. Are bent at both ends (see FIGS. 9 and 10).

  Further, the panel 7A attached to the cover 5A is provided with a tongue piece 72 protruding in the longitudinal direction from the end of the cover 5A on the open end side. On the other hand, the panel 7B attached to the cover 5B is provided with a recess 73 into which the tongue piece 72 of the panel 7A is fitted at the end of the cover 5B on the open end side.

  Thus, when the two covers 5A and 5B are attached to one heat radiating member 2, the protrusion 54 of one cover 5A is fitted to the open end of the other cover 5B, and the two covers 5A and 5B are connected. Also in this section, the pitch of the louvers 53 is kept constant without changing (see FIGS. 16 and 17). Therefore, it is possible to improve the appearance of the appearance as compared with the case where the interval between the louvers across the connecting portion is widened.

  Here, the pair of covers 5A and 5B is connected to the heat dissipating member 2 as shown in FIG. 17, thereby being connected with a gap between the open ends. Similarly, when the pair of panels 7A and 7B are attached to the covers 5A and 5B as shown in FIG. 16, there is a gap between the end of the panel 7A excluding the tongue piece 72 and the end of the panel 7B. Yes. That is, when the covers 5A and 5B and the panels 7A and 7B made of the synthetic resin material are expanded by the heat generated by the light source unit 1, if the ends of the covers are in contact with each other, excessive stress is applied to cause problems such as breakage. there is a possibility. On the other hand, if a gap is provided between the ends of the covers 5A and 5B and the panels 7A and 7B as described above, the occurrence of problems due to thermal expansion can be suppressed. However, since the tongue piece 72 of one panel 7A and the recess 73 of the other panel 7B are fitted when attached to the covers 5A and 5B, entry of foreign matters such as dust and insects can be prevented.

  In the present embodiment, the louver 53 is formed of an impermeable synthetic resin material, but the louver 53 may be formed of a synthetic resin material having translucency such as an acrylic resin or a polycarbonate resin. Even when the louver 53 is formed of a light-transmitting material, discomfort glare can be suppressed by changing the optical path of light emitted from the light source unit 1 and performing light distribution control.

  An embodiment of a lighting fixture using the light emitting device A of the present embodiment is shown in FIG. This lighting fixture includes a fixture main body 100 formed in a long rectangular box shape with an open bottom surface, a mounting plate 101 to which the light emitting device A is attached, and a lighting device (not shown) housed in the fixture main body 100. The appliance main body 100 is attached to the ceiling surface. The mounting plate 101 is formed in a rectangular plate shape having substantially the same shape and dimensions as the opening surface of the instrument body 100, and the light emitting device A is mounted on the surface (lower surface) thereof. The mounting plate 101 to which the light emitting device A is mounted is housed in the instrument main body 100 and screwed to the instrument main body 100 at both ends in the longitudinal direction by two fixing screws 102.

1 Light Source 2 Heat Dissipation Member 5 Cover
10 Mounting board
53 Louva
530 Deflection suppression part

Claims (3)

  A light source part in which one or more light emitting diodes are mounted on the surface of a mounting board formed in a long plate shape, and a heat dissipation member that at least partially contacts the back surface of the mounting board along the longitudinal direction. And a cover that covers the mounting substrate and the heat dissipating member so that the surface faces the window hole, and radiates from the light source section through the window hole. One or a plurality of louvers that block or partially change the light path, and the louvers have a deflection suppressing portion that opposes the surface of the mounting substrate and suppresses the bending of the mounting substrate. A light emitting device.   The light emitting device according to claim 1, wherein a conductive pattern for supplying power to the light emitting diode is formed on the surface of the mounting substrate, and the louver has an escape portion that escapes the conductive pattern.   An illumination fixture comprising: the light-emitting device of claim 1 or 2; and a fixture main body that holds the light-emitting device.

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