JP2011154848A - Light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device with improved adhesion between a heat radiation member and a substrate on which a light source is mounted, especially the vicinity of the light source, excellent heat radiation property on the light source, and high reliability. <P>SOLUTION: The light-emitting device 100 includes a heat radiation member 40, a substrate 20 which is placed on the heat radiation member 40 and includes a plurality of light sources 10 arrayed with a distance d on an upper surface, a cover member 30 which is held by the heat radiation member 40 to cover the substrate 20, and a presser member 50 which is interposed between the substrate 20 and the cover member 30 to press the substrate 20 against the heat radiation member 40. The presser member 50 includes a protruding part 60 which contacts the substrate 20 or the cover member 30. A contact width between the protruding part 60 and the substrate 20 or the cover member 30 is less than the distance d in the array direction of the plurality of light sources 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light emitting device, and more particularly to a structure for improving heat dissipation of a substrate on which a light source is mounted.

  2. Description of the Related Art In recent years, light-emitting devices equipped with semiconductor light-emitting elements such as light-emitting diodes (LEDs) and laser diodes (LDs) as light sources have been used for various lighting and display devices. In particular, these semiconductor light-emitting elements are attracting attention as illumination light sources that can replace light bulbs and fluorescent lamps because of their low power consumption and long life.

  For example, in Patent Document 1, a light source substrate cover is disposed on the mounting surface side of the point light source of the light source substrate, and a support member is disposed on the rear surface side. A light source device has been proposed in which a light source substrate is sandwiched between and supported by a light source substrate cover and a support member by providing them in a matching manner and fixing each member by fitting a protrusion into this recess.

  Patent Document 2 (particularly, FIGS. 5 to 8) discloses an attachment structure, a circuit board on which a plurality of LEDs are attached, a clip for fixing the circuit board to the attachment structure, and an attachment structure. An LED lighting device for a product display case is described, comprising a protective lens fitted into a lens receiving part.

JP 2008-186780 A Special table 2008-500705 gazette JP 2009-094026 A JP 2009-158353 A JP 2009-158354 A JP 2008-210943 A

  However, in the light source device described in Patent Document 1, since the light source substrate is sandwiched and supported by the entire upper surface of the support member and the entire lower surface of the light source substrate cover, the light source is subject to warping or undulation. In the surface of the substrate, the pressing force against the substrate becomes uneven, the light source substrate partially floats from the support member, and the adhesion between the light source substrate and the support member may be reduced. Further, in the LED lighting device described in Patent Document 2, since the circuit board is fixed to the mounting structure by only two clips, the fixing portion is limited, and the pressing force is locally applied. In a wide range, the adhesion to the mounting structure cannot be sufficiently improved. In particular, if the adhesion between the substrate and the heat radiating member is poor near the light source that is the heat source, the heat generated from the light source cannot be efficiently transferred to the heat radiating member, and the heat radiating property of the light source is reduced, and as a result the reliability of the device Will be reduced.

  Therefore, the present invention has been made in view of such circumstances, and can improve the adhesion between the substrate on which the light source is mounted, in particular, the vicinity of the light source and the heat radiating member. An object is to provide a high light emitting device.

The present invention can solve the above problems by the following means (1) to (8).
(1) A heat dissipating member, a substrate placed on the heat dissipating member and having a plurality of light sources arranged at intervals d on the upper surface, a cover member held by the heat dissipating member and covering the substrate, and the substrate A pressing member that is interposed between the cover members and presses the substrate against the heat radiating member, and the pressing member has a convex portion that contacts the substrate or the cover member, A light emitting device in which a contact width between the convex portion and the substrate or the cover member in the arrangement direction of a plurality of light sources is smaller than the distance d.
(2) The light emitting device according to (1), wherein a contact portion between the convex portion and the substrate or the cover member has a dot shape.
(3) The light emitting device according to (1) or (2), wherein the convex portion is provided between the light sources.
(4) The light sources are arranged in a plurality of rows, the convex portions are provided between the light sources in each row of the light sources, and the light sources and the convex portions are the convex portions in the first row. The light emitting device according to any one of (1) to (3), wherein the light sources in the second row adjacent to the first row are arranged adjacent to each other.
(5) The pressing member is a member provided on the substrate separately from the substrate and the cover member, and the convex portions are in contact with only the cover member (1) to (4). ).
(6) The light-emitting device according to (5), wherein the pressing member includes a plurality of light reflecting portions each surrounding the light source.
(7) The pressing member includes a plate-like portion having a substantially flat upper surface, and a column portion provided on the back side of the plate-like portion to support the plate-like portion, and the convex portion is provided on the plate-like portion. The light emitting device according to (6), wherein a portion is provided, and the column portion is provided close to the convex portion.
(8) Each of the light reflecting portions includes a reflecting surface that reflects light from the light source to the side of the apparatus, and the plate-like portion is connected to the plurality of light reflecting portions and is higher than the light reflecting portion. The light emitting device according to (7), wherein the convex portion and the column portion are provided between the light reflecting portions.

  According to the present invention, the pressing member that is interposed between the cover member and the heat radiating member and presses the substrate having the plurality of light sources arranged on the upper surface on the upper surface against the heat radiating member is spaced in the light source arrangement direction. By having a convex portion that contacts the cover member or the substrate with a contact width smaller than d, it is possible to select the location, size, and number of pressing force points or action points of the pressing member against the substrate. Accordingly, since the distribution of the pressing force in the substrate surface can be controlled by the convex portion of the pressing member, even if the substrate or the heat radiating member is warped or swelled, the adhesion between the substrate and the heat radiating member is improved. Thus, a highly reliable light-emitting device with excellent heat dissipation of the light source can be provided.

FIG. 2 is a schematic perspective view (a) showing an overall appearance of a light emitting device according to an embodiment of the present invention, and a schematic perspective view (b) showing its configuration. FIG. 2 is a schematic perspective view (a) showing an internal structure of the light emitting device of FIG. 1 and a schematic side view (b) according to one embodiment of the present invention. It is a schematic perspective view for demonstrating the principal part of the light-emitting device of this invention concerning one embodiment of this invention. The schematic perspective view (a) which shows the pressing member of the light-emitting device of FIG. 1, the schematic front view (b), its schematic sectional drawing (c), and (d) concerning one embodiment of this invention. is there. FIG. 2 is a schematic perspective view (a) illustrating a relationship between a light source and a pressing member of the light-emitting device of FIG. 1 and a schematic cross-sectional view (b) according to the embodiment of the present invention. It is a schematic sectional drawing (a) and (b) which shows the modification of the light-emitting device which concerns on one embodiment of this invention. It is a schematic sectional drawing (a) and (b) which shows another modification of the light-emitting device which concerns on one embodiment of this invention. FIG. 4 is a schematic perspective view (a) showing an overall appearance of a light emitting device according to another embodiment of the present invention, a schematic perspective view (b) showing an internal configuration thereof, and a schematic sectional view (c). . FIG. 9 is a schematic perspective view (a), a schematic top view (b), and a schematic cross-sectional view (c) showing a pressing member of the light emitting device of FIG. 8 according to one embodiment of the present invention.

  Hereinafter, embodiments of the invention will be described with reference to the drawings as appropriate. However, the light emitting device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements described below are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. Similarly, the embodiments described below can be applied by appropriately combining the components and the like unless otherwise specified.

<Embodiment 1>
FIG. 1A is a schematic perspective view showing the overall appearance of the light emitting device according to Embodiment 1, and FIG. 1B is a schematic perspective view showing the configuration thereof. 2A is a schematic perspective view showing the internal structure of the light emitting device of FIG. 1, and FIG. 2B is a schematic side view thereof. FIG. 3 is a schematic perspective view for explaining a main part of the light emitting device of the present invention. 4 (a) is a schematic perspective view showing a pressing member of the light emitting device of FIG. 1, FIG. 4 (b) is a schematic front view thereof, and FIG. 4 (c) is FIG. 4 (b). FIG. 4D is a schematic cross-sectional view showing the A-A cross section in FIG. 4, and FIG. 4D is a schematic cross-sectional view showing the BB cross section in FIG. 5A is a schematic perspective view showing the relationship between the light source and the pressing member of the light emitting device of FIG. 1, and FIG. 5B is a schematic vertical sectional view thereof.

  As shown to Fig.1 (a), the light-emitting device 100 which concerns on Embodiment 1 has the elongate shape extended | stretched to one direction. As shown in FIG. 1B and FIG. 2, the light emitting device 100 is mainly a substrate having a heat radiating member 40 and a plurality of light sources 10 placed on the heat radiating member and arranged at intervals d on the upper surface. 20, a cover member 30 that is held by the heat dissipation member and covers the substrate, and a pressing member 50 that is interposed between the substrate and the cover member and presses the substrate against the heat dissipation member. Hereinafter, the longitudinal direction of the light emitting device parallel to the substrate surface is defined as the x direction (x axis), the short direction perpendicular thereto is defined as the y direction (y axis), and the height direction perpendicular to the xy plane is defined as the z direction (z Axis). Note that the viewpoint from the z direction of the xy plane is “plan view”, “cross section” is a section parallel to the plane including the z axis (mainly the yz plane), and “vertical section” is parallel to the xy plane. It is a cross section.

  More specifically, the heat radiating member 40 has a rectangular shape that is long in the x direction in plan view, and a substantially flat plate shape on which the substrate 20 is placed in a cross section parallel to the yz plane (see FIG. 2B). A central portion of each of the first and second portions, and an extended portion that is bent and extended in a substantially L-shape on the opposite side to the side on which the substrate 20 is provided, that is, on the lower side. Has a collar portion 48 bent into a collar shape.

  The substrate 20 has a rectangular shape that is long in the x direction in plan view, and a plurality of light sources 10 are mounted on the upper surface thereof. As shown in FIGS. 3 and 5, the light sources 10 are arranged at equal intervals with a center-to-center distance p (interval d) in the x direction, and two rows of such light sources 10 are provided in the y direction. The light sources 10 in the first row are each displaced by p / 2 in the x direction with respect to the light sources 10 in the second row. In this way, if one light source arranged in one row at equal intervals is selected by skipping, and they are displaced in a direction perpendicular to the arrangement direction and arranged in two rows, the light source in the first row and the adjacent first light source are arranged. The distance between the two rows of light sources can be increased, the light sources as heat sources are appropriately dispersed on the substrate, and heat can be efficiently drawn from each light source. The “interval d” is defined as the shortest distance in the arrangement direction of any two adjacent light sources arranged on the substrate.

  The cover member 30 is a half of a rectangular shape that is long in the x direction in a plan view, a rectangular shape with one side open in a cross section parallel to the yz plane (see FIG. 2B), and more specifically, a substantially inverted U shape. It has a cylindrical shape. Further, the cover member 30 has flanges 37 projecting outward at lower ends on both sides thereof, and the flanges 37 are locked to the flanges 48 of the heat dissipation member and held by the heat dissipation member 40. Thereby, the cylindrical body in which the substrate 20 is provided is formed by the cover member 30 and the heat dissipation member 40. Further, caps 70 that close the openings are respectively fitted and attached to both ends of the cylindrical body in the x direction to constitute a main body of the light emitting device 100.

  As shown in FIGS. 1B and 2B, the pressing member 50 is a member provided separately from the substrate 20 and the cover member 30 in the light emitting device 100, and is emitted from the light source 10. It is installed on the substrate 20 as a light reflector that reflects light to the outside of the apparatus. Moreover, the pressing member 50 has the convex part 60 which protrudes outside on the upper surface. The pressing member 50 is sandwiched and fixed between the cover member 30 and the heat radiating member 40 when the cover member 30 is held by the heat radiating member 40 as described above. At this time, the pressing member 50 has the convex portion 60 in contact with the inner surface of the cover member 30 and is pressed by the cover member 30, and the other lower surface (hereinafter sometimes referred to as “bottom surface”) is in contact with the upper surface of the substrate 20. The substrate 20 is pressed against the heat radiating member 40.

  As shown in FIG. 3, the contact width w between the convex portion 60 of the pressing member 50 and the cover member 30 in the arrangement direction of the plurality of light sources 10 is smaller than the interval d. With such a configuration, it is possible to select the location, size, and number of pressing force points or action points of the pressing member 50 against the substrate 20. Therefore, since the distribution of the pressing force in the substrate surface can be controlled by the convex portion 60 of the pressing member 50, even when the substrate 20 or the heat radiating member 40 is warped or swelled, the heat radiating member 40 and the substrate 20 Of the light source, particularly in the vicinity of the light source, it is possible to obtain a highly reliable light emitting device with excellent heat dissipation of the light source 10. In the light emitting device 100 of the example shown in FIGS. 1 to 5, the convex portion 60 of the pressing member 50 is in contact with the cover member 30, but this convex portion 60 is provided on the lower surface and is in contact with the substrate 20. The same may be said of the contact width of the convex part 60 and the board | substrate 20 in this case. In addition, the convex part 60 which compares the contact width w with respect to the space | interval d shall select and consider the thing located between the two light sources 10 spaced apart by the space | interval d in planar view, and the two light sources If there is no projection 60 between the two, the projection with the shortest distance from each of the two light sources is selected and considered. In addition, when there are a plurality of convex portions 60 between the two light sources 10, the total contact width of each convex portion with the cover member or the substrate is defined as w.

  In the pressing member 50, the convex portion 60 may be provided on either the side facing the inner surface of the upper surface of the cover member 30, that is, the upper surface side, or the side facing the upper surface of the substrate 20, that is, the lower surface side. . When the convex portion 60 is provided on the upper surface side of the pressing member 50, the contact portion between the convex portion 60 and the cover member 30 becomes a force point of the pressing force against the substrate 20. In this case, first, the pressing force from the cover member 60 is concentrated and applied to the convex portion 60, and the pressing force can be appropriately diffused and transmitted to the lower surface side from the convex portion 60. Therefore, it is easy to apply a pressing force uniformly on the substrate surface, and a wide range of the substrate 20 can be pressed. Moreover, compared with the case where the convex part 60 is provided in the lower surface side, it is excellent in installation stability of the pressing member 50, the inclination of the pressing member 50 is suppressed, and the board | substrate 20 can be pressed down efficiently. For this reason, as shown in FIG. 2 (b), it is preferable that the convex portion 60 contacts only the cover member 30. On the other hand, as shown in FIG. 7 as a modified example to be described later, when the convex portion 60 is provided on the lower surface side of the pressing member 50, the contact portion between the convex portion 60 and the substrate 20 is the point of action of the pressing force on the substrate 20. Become. In this case, the pressing force transmitted from the upper surface side of the pressing member 50 can be concentrated on the convex portion 60 on the lower surface, and a specific region on the substrate surface can be strongly pressed. Moreover, the convex part 60 is suitably provided according to the magnitude | size of a board | substrate and arrangement | positioning of a light source, and may be one or more, and may be provided in both the upper surface side and lower surface side of the pressing member 50. Further, the convex portion 60 is preferably integrally formed as a part of the pressing member 50, but may be formed by adding another member to the pressing member 50.

  Moreover, it is preferable that the contact part of the convex part 60 and the board | substrate 20 or the cover member 30 is dot-like. By doing so, the force point or point of action of the pressing force of the pressing member 50 against the substrate 20 can be locally provided, and the pressing force can be diffused substantially uniformly from the convex portion 60, or conversely, the pressing force can be applied to the convex portion 60. It is possible to control the distribution of the pressing force in the substrate surface by concentrating the pressure. The term “spot-like” as used herein does not mean only a complete point contact, but also includes a case having a minute contact area. Such a configuration can be achieved by forming the surface of the convex portion 60 with a curved surface, for example, a hemispherical surface, a part of a spherical surface, or a curved surface with a flat shape. In addition, the convex part 60 may be in contact with the substrate 20 or the cover member 30 on the surface, or may have a shape (such as a trapezoidal shape in a sectional view) having a substantially flat upper surface. In such a case, the contact width w between the convex portion 60 and the cover member 30 or the substrate 20 is preferably set to, for example, 5% or more and 10% or less with respect to the distance d. Although the height (projection amount) of the convex part 60 is not specifically limited, For example, it is about 0.5 mm or more and 1 mm or less. Moreover, when the convex part 60 is provided with two or more by the pressing member, it is preferable that the height of each convex part is substantially equal. When the heights of the respective convex portions are uniform, it is possible to apply a pressing force evenly to the respective convex portions.

  Furthermore, it is preferable that the convex part 60 is provided between the light sources. Thereby, the pressing force with respect to the substrate surface in the vicinity of the two light sources 10 sandwiching the convex portion can be efficiently controlled by the single convex portion 60. In particular, it is preferable that the position of the convex portion 60 in the x direction is substantially at the center between the light sources because the pressing force can be evenly applied to the substrate surfaces in the vicinity of the two light sources 10 sandwiching the convex portion. The position of the convex portion 60 in the y direction is preferably a position serving as the center of gravity of the pressing member 50, in this example, approximately the center of the entire width of the pressing member 50 in the y direction (depth). Thereby, the inclination of the pressing member 50 can be suppressed and the pressing force can be efficiently transmitted to the bottom surface side. In order to efficiently transmit the pressing force from the convex portion 60 to the vicinity of the light source 10 of the substrate 20, the distance d between the light source and the light source is preferably 100 mm or less, and the distance between the light source 10 and the convex portion 60 is 50 mm. The following is preferable. A plurality of convex portions 60 may be provided between the light sources. For example, when the distance d between the light sources is larger than 100 mm, about two or three convex portions 60 are provided between the light sources. Furthermore, in order to effectively hold the substrate surface in the vicinity of the light source 10, the shortest distance between the bottom surface of the pressing member 50 and the light source 10 is preferably 10 mm or less.

  When the light sources 10 are arranged in a plurality of rows, the convex portions 60 are provided between the light sources in each row of the light sources 10, and the light sources 10 and the convex portions 60 are connected to the convex portions 60 in the first row. It is preferable that the light source 10 of the 2nd row | line | column adjacent to 1 row is arrange | positioned so that it may adjoin. In other words, in plan view, it is preferable that the light sources 10 and the convex portions 60 are alternately arranged at the lattice points of the rectangular lattice both vertically and horizontally. Thus, the first row of convex portions 60 is pressed against the substrate surface in the vicinity of the light source 10 in the second row adjacent to the convex portions 60 in addition to the two light sources 10 sandwiching the convex portions 60 of the first row. The pressure can be controlled efficiently.

  As shown in FIGS. 4 and 5, the light reflecting portion 65 of the pressing member 50 reflects the light from the light source 10 to the side of the apparatus, and has a reflecting surface curved so as to cover the upper side and the side of the light source 10. Each has. Thus, it is preferable that the pressing member 50 has a plurality of light reflecting portions 65 each surrounding the light source 10. Thereby, the bottom surface of the light reflecting portion 65 of the pressing member 50 is in contact with the substrate surface so as to surround the light source 10, and the vicinity of the light source 10 that is the heat source of the substrate 20 can be strongly pressed against the heat radiating member 40. In addition, since the light reflecting portion 65 is formed so as to protrude in the y direction, the bottom surface of the light reflecting portion 65 can suppress the inclination of the pressing member 50 in the y direction.

As shown in FIGS. 3 and 4, the pressing member 50 has a plate-like portion 63 having a substantially flat upper surface above the light reflecting portion 65, and the convex portion 60 has the plate-like portion 63. Is provided. Thereby, the pressing force applied to the convex portion 60 can be transmitted to the plate-like portion 63 and diffused widely. Further, notches 62 are respectively provided on both sides of the convex portion 60 of the plate-like portion 63 (hereinafter, a portion sandwiched between the two notches 62 is referred to as an elastic portion 61). By forming such an elastic portion 61, the distribution of the pressing force applied from the convex portion 60 can be controlled. Further, the reaction force of the elastic portion 61 against the pressing of the convex portion 60 generates a force for pushing up the cover member 30, and the engagement strength between the cover member 30 and the heat radiating member 40 can be increased. There is also an effect of reducing a gap between the pressing member 50 and the cover member 30 or the substrate 20 formed by the presence of the convex portion 60. The elastic portion 61 and the notch 62 are not essential elements and can be omitted. Here, “elasticity” is, for example, a resin material, preferably having a flexural modulus (ISO standard 178, JIS standard K7171) of about 2000 MPa to 4000 MPa, and further, Charpy impact strength (notched) ( The ISO standard 179 and the JIS standard K7111) are preferably 10 kJ / m ² or more.

  Further, a support column 64 is provided on the back side of the plate-like unit 63. The column portion 64 is a plate-like body that is continuous with the back surface of the plate-like portion 63 and stands substantially perpendicular to the back surface, and is a so-called rib. Thereby, in the cross section parallel to the xz plane, the light reflecting portion 65 is surrounded by the plate-like portion 63 and the column portion 64 in a substantially inverted U shape. The column portion 64 has a function to support and reinforce the plate-like portion 63, suppresses the inclination of the pressing member 50, and efficiently transmits the pressing force applied to the upper surface side (particularly the convex portion 60) to the bottom surface side. Can be easier. From this point of view, it is preferable that the column portion 64 is provided close to the convex portion 60. Further, when the notch 62 is provided in the vicinity of the convex portion 60 as described above, there is an effect of compensating the mechanical strength of the plate-like portion 63 that is lost by the notch 62. Moreover, the support | pillar part 64 has a shape which inclined inside itself so that the width | variety of the y direction may become small, so that it goes below from the back surface of the plate-shaped part 63. FIG. Thereby, it can prevent that the support | pillar part 64 contacts with the other member provided near this pressing member 50. FIG. Therefore, as shown in FIGS. 3 and 5, when the two pressing members 50 are arranged back to back, the support member 64 of the other pressing member faces the back surface of the light reflecting portion 65 of one pressing member. Thus, both can be arranged close to each other, and the apparatus can be miniaturized. Further, when the two pressing members 50 are arranged close to each other as described above, the plate-like portions 63 are arranged close to each other, and the inclination of the pressing member 50 toward the inside of the apparatus can be suppressed. Further, as shown in the drawing, the plate-like portion 63 is preferably provided by being connected to a plurality of light reflecting portions 65, and the convex portion 60 and the column portion 64 are provided between the light reflecting portions. Is preferred. If the convex portion 60 is directly above the light reflecting portion 65, the reflection surface of the light reflecting portion may be deformed by the pressing force applied to the convex portion, but according to such a configuration, the pressing force applied to the convex portion 60 is not affected. The pressure is first transmitted to the column portion 64, whereby the substrate 20 can be pressed by the bottom surface of the light reflecting portion 65. That is, in the pressing member 50, it is preferable that the convex part 60, the support | pillar part 64, and the light reflection part 65 are arrange | positioned in the x direction in this order.

  As shown in FIG. 4, the pressing member 50 may have a positioning portion 68 (a positioning convex portion) on a part of the bottom surface, and the positioning portion 68 is provided in the hole 28 provided in the substrate 20. And is temporarily fixed. By such a positioning portion 68, the pressing member 50 can be accurately installed with respect to the light source 10, the vicinity of each light source 10 of the substrate 20 can be accurately pressed, and the pressing member 50 is a light reflector. Provides excellent light distribution. In addition, in order to press the substrate 20 on the bottom surface of the pressing member 50, the height (projection amount) of the positioning portion is preferably equal to or less than the thickness of the substrate 20.

(Modification 1)
Each component of the light-emitting device according to Embodiment 1 can be changed to various forms. The light emitting device of the example shown below is obtained by changing the shape of the pressing member in the light emitting device 100 described above. 6A and 6B are schematic cross-sectional views showing a modification of the light-emitting device 100 according to Embodiment 1. FIG.

  In the light emitting device of the example shown in FIG. 6A, the pressing member 51 is a columnar member provided on the substrate 21 and having a convex portion 60 on the upper surface. Although not shown, the pressing member 51 has a cross shape in plan view. Further, a plurality of pressing members having such a shape may be arranged apart from each other, or may be a pressing member having a shape in which they are connected in one direction (here, the x direction). With the pressing member 51 having such a shape, the inclination is suppressed, and the substrate 21 can be efficiently pressed against the heat radiating member 41. The pressing member 51 can also function as a partition (partition plate) that separates the light source from the light source. At this time, the substantially U-shaped or substantially L-shaped partition wall of the pressing member 51 is preferably extended so as to surround each light source 10. As a result, the installation stability of the pressing member 51 is increased, and each partition wall strongly presses the vicinity of each light source 10 on the substrate 21, so that the heat dissipation of each light source 10 can be enhanced. That is, it can be considered that such a partition corresponds to the light reflecting portion 65 described above. Further, the pressing member 51 may be a translucent member or a light reflecting member, and the wall surface of each partition wall may be a flat surface or a curved surface. Further, in such a pressing member 51, the pressing force applied to the upper surface side (particularly the convex portion 60) is transmitted linearly to the lower surface side of the pressing member. For this reason, it is preferable that the convex part 60 is provided in the position where the distance from the light source 10 becomes the minimum in the vicinity of the light source 10, more specifically, in the approximate center of the upper surface or the lower surface of the pressing member 51. In the light emitting device of the example shown in FIG. 6A, the convex portion 60 is provided adjacent to the light source 10 in the approximate center of the upper surface of the partition wall that extends and continues in the x direction. In addition, the convex part 60 may be provided in the approximate center of the cross | intersection part of a cross-shaped partition.

  In the light emitting device of the example shown in FIG. 6A, the end portion of the cover member 31 and the end portion of the heat dissipation member 41 are bent inward to form a flange portion 37 and a flange portion 48, respectively. The flange portion 37 of the member is structured to lock the flange portion 48 of the heat dissipation member so as to be wound from the outside. Thus, the holding means for the cover member with respect to the heat radiating member can take various forms. At this time, the force by which the cover member is held by the heat radiating member (the pulling force) and the force by which the cover member presses the pressing member are parallel to the z direction, that is, perpendicular to the substrate surface and in the same direction. It is preferable that the pressing force can be efficiently transmitted to the substrate surface. In particular, the holding of the cover member shown in FIGS. 1 to 5 and 6 is caused by the elasticity of the cover member, both the force by which the cover member is held by the heat dissipation member and the force by which the cover member presses the pressing member. Means are preferred. Such a cover member holding means has a wider range of force that the cover member is held by the heat dissipation member and force that the cover member presses the pressing member than the cover member holding means of the example shown in FIG. Can be applied evenly. Moreover, it is preferable also in the point which can reduce a number of parts and a man-hour.

  Next, in the light emitting device of the example shown in FIG. 6B, the heat radiating member 42 has a recess 46 in the central portion on which the substrate 22 is placed, while the pressing member 52 extends in a bowl shape from the bottom surface. It has a protruding collar 69. The concave portion 46 of the heat radiating member is provided with an overhanging portion that protrudes laterally so that the flange portion 69 of the pressing member is locked. Further, a hole is provided in a part of the substrate 22. Then, the pressing member 52 is fixed by fixing the flange portion 69 of the pressing member 52 through the hole of the substrate 22 to the concave portion 46 of the heat radiating member. According to such a configuration, the substrate 22 and the heat radiating member 42 can be pinched by the flange portion 69 of the pressing member, and the substrate 22 can be pressed against the heat radiating member 42 more strongly. There may be one or a plurality of the depressions 69 of the pressing member and the recesses 46 of the heat dissipation member, and the recesses 46 may be provided in a groove shape by extending in one direction (here, the x direction). . By providing such a recess 46 in the heat radiating member 42, the surface area of the heat radiating member can be increased and the heat dissipation can be improved. In addition, the heat radiating member 42 of such a shape can be produced by, for example, a combination of extrusion processing or sheet metal bending processing and welding. Moreover, although the hole may be provided in the heat radiating member 42 as an alternative to the concave portion 46, the concave portion 46 is preferable from the viewpoint of preventing moisture and outside air from entering the apparatus in addition to the heat dissipation of the heat radiating member.

(Modification 2)
FIGS. 7A and 7B are schematic cross-sectional views showing another modification of the light emitting device 100 according to the first embodiment. In the light emitting device of the present invention, the pressing member may be a means for pressing the substrate against the heat radiating member, and may be provided integrally with the cover member or the substrate. As an example, the case where the pressing member is integrated with the cover member and provided as a single member will be described below.

  In the light emitting device of the example shown in FIG. 7A, the pressing member 53 (cover member 33) has a shape bent in a substantially M shape in a cross section parallel to the yz plane, and has a substantially V shape in the center. A convex portion 60 is provided at the tip of the bent portion (the inner surface side of the bottom portion). In addition, the pressing member 53 has a flange portion 37 protruding outward and fixed to the heat radiating member 43 by a screw 80. Thereby, the pressing force acts on the convex portion 60 in contact with the substrate 20 due to the elasticity of the upper portion of the pressing member 53, and the substrate 20 can be pressed against the heat radiating member 43. One or more bent portions of the pressing member 53 and the convex portions 60 associated therewith may be provided. In this example, the bent portion of the pressing member 53 is provided to be extended in one direction (here, the x direction), but is not limited thereto, and may be provided as a partial depression. In addition, a plurality of convex portions 60 may be provided for one bent portion, or may be provided so as to be extended in accordance with the shape of the bent portion. Furthermore, the cross-sectional shape of the pressing member 53 is not limited to being refracted, but may be curved. The pressing member 53 is preferably a translucent member in order to obtain a good light distribution. In addition, in the light emitting device of the example shown in FIG. 7A, in addition to this, for example, from the inner surface of the side surface of the substantially U-shaped cover member 30 in a cross-sectional view in FIG. It is also possible to provide an extended portion that is bent and extends into a shape and form the convex portion 60 at the tip thereof, or the extended portion itself or the tip thereof as the convex portion 60.

  Next, in the light emitting device of the example shown in FIG. 7B, the pressing member 54 (cover member 34) is a plate-like member provided with a plurality of holes in a part thereof. The hole of the pressing member 54 is provided corresponding to each light source 10 so that the side surface functions as a light reflecting portion 66 surrounding the light source 10. The light reflecting portion 66 has a side surface whose diameter on the lower side is smaller than that on the upper side, and the light emitted from the light source 10 can be efficiently reflected upward and taken out to the outside. The side surface of the light reflecting portion 66 may be a substantially flat inclined surface or a curved surface. Further, the hole serving as the light reflecting portion 66 may be provided so as to extend in one direction (here, the x direction) so that a plurality of light sources are arranged inside one hole. It may be one hole. The convex portion 60 is provided at the approximate center on the lower surface side of the pressing member 54, and its tip protrudes below the bottom surface of the light reflecting portion 66 in a state before installation. Although not shown, the convex portion 60 is provided on the elastic portion as described above. The end portion of the pressing member 54 (the flange portion 37) and the end portion of the heat dissipation member 44 are sandwiched and fixed by the clip 81. As a result, the pressing member 54 can press the substrate 20 against the heat radiating member 44 while the convex portion 60 first contacts the upper surface of the substrate 20 and the elastic portion bends. Finally, the bottom surface of the light reflecting portion 66 of the pressing member 54 may contact the top surface of the substrate 20. Further, in such a pressing member 54, the light reflecting portion 66 is provided so as to protrude downward. If the contact width between the light reflecting portion 66 and the substrate 20 satisfies the above-described condition, the light reflecting portion 66 66 may be regarded as a convex portion, and in this case, the convex portion 60 shown in the figure may be omitted.

  As described above, the light emitting device that is long in the x direction is illustrated as a modification of the light emitting device 100. However, the arrangement of the light source, the configuration of the pressing member, and the like can be considered to be expanded, for example, repeated in the y direction. Such a structure includes a light emitting device in which the pressing member can be a translucent member as in the examples shown in FIGS. 6A and 7A, FIG. As in the example shown in the second embodiment, the light emitting device is particularly suitable for a light emitting device that reflects light from the light source and extracts the light upward.

  Hereafter, each component of the light-emitting device of this invention is explained in full detail.

(light source)
As the light source 10, for example, a light emitting element used in this field, such as a semiconductor light emitting element such as an LED element or an LD element, or an organic EL element (Organic Electro-Luminescence) can be used. The light source 10 may directly mount such a light emitting element on the substrate 20, or may be mounted on a surface mount type (SMD) in which the light emitting element is disposed on a ceramic or resin package substrate, or on a lead frame. A light emitting device such as a shell type (lamp type) in which the arranged light emitting element is covered with a covering member made of glass or resin may be used. In addition, the base or covering member includes a wavelength conversion member (for example, an aluminum oxide phosphor, a nitride phosphor, a silicate phosphor, etc.) or a light diffusion member (for example, alumina, silica, titanium oxide, etc.). Can be contained. Further, a plurality of light emitting elements having different emission wavelength ranges (for example, emitting light in each wavelength range of red, green, and blue (RGB)) may be combined. In addition, the light source 10 may be a light bulb such as a halogen lamp. The light sources 10 are arranged on the upper surface of the substrate 20 at a predetermined interval. At this time, the light sources 10 are electrically connected to the wiring of the substrate 20 by a conductive bonding member such as Ag, Au, or Sn.

(substrate)
The board 20 is a circuit board on which electronic components such as the light source 10 and the connector 29 are arranged and wirings that are electrically connected to the electronic parts are formed. As the substrate 20, it is preferable to use a material having high mechanical strength and thermal conductivity and less thermal deformation. Specifically, a printed wiring board using ceramic, glass, glass epoxy, aluminum alloy or the like is preferably used. In addition, the substrate 20 in the light emitting device 100 of Embodiment 1 has a rectangular shape that is long in the x direction, but the shape and number thereof are not limited, and for example, a plurality of substantially square ones may be arranged side by side. It may be circular as in the second embodiment described later. The thickness of the substrate 20 is, for example, about 0.6 mm to 2 mm. Further, the substrate 20 has wiring and a connector 29 (see FIG. 2A) that enable electrical connection with an external power source. Like the light source 10, the connector 29 is electrically connected to the wiring. Yes. It is preferable that the connector 29 is provided at the end in the x direction of the substrate 20 because it is easy to connect to an external power source and when the plurality of substrates 20 are arranged in the x direction, the substrates are easily connected in series. . Further, when a plurality of light emitting devices are provided, the light emitting devices are easily connected in series. Further, grease or double-sided tape with excellent heat dissipation may be provided on the lower surface of the substrate 10 to fill a gap with the heat dissipation member 40, or a metal plate such as copper or aluminum alloy may be bonded.

(Cover member)
The cover member 30 may be formed of a material known in the art as long as the light emitting surface (window) that emits light from the light source 10 to the outside of the apparatus is made of a light-transmitting material. . For example, it can be formed of a light and strong plastic or glass, and in consideration of workability and heat resistance, it is preferably composed of a resin material such as polycarbonate or acrylic. Further, the window portion is made of a light-transmitting material as described above, and other portions are mixed with a light-reflective or light-shielding material, such as a metal material such as an aluminum alloy or stainless steel, or a light diffusion member. It can also be formed of the above resin material. Further, a hole (opening) may be provided in a part of the member made of the light reflective or light shielding material, and the hole may be used as a window. Here, the light-transmitting material preferably transmits light from the light source 10 efficiently, but a filler having excellent thermal conductivity may be mixed therein. By doing so, the heat generated in the substrate 20 can be easily transmitted to the cover member 30 via the heat dissipation member 40, and the heat dissipation of the substrate 20 can be enhanced. As such a filler, alumina, silica, titanium oxide, or the like can be used, and these can also be mixed as a light diffusing member. Thus, when the cover member 30 has a light diffusion effect, luminance unevenness and color unevenness due to the light distribution of the light source 10 can be reduced. In addition, the cover member itself may be subjected to a surface roughening process such as sandblasting or polishing, or a diffusion sheet may be attached to the outside or the inside of the cover member. Moreover, although the shape of a cover member depends on the pressing member which contacts, especially the form of the convex part 60, a cross-sectional shape can also use a substantially semicircle or circular arc shape, for example.

(Heat dissipation member)
The heat radiating member 40 is a member serving as a pedestal on which the substrate 20 is placed. It is preferable that the heat radiating member 40 is comprised with the material excellent in thermal conductivity. For example, a metal plate, more specifically, a metal material such as an aluminum alloy, stainless steel, iron, copper, or the like, or a material obtained by extruding an aluminum alloy and subjected to coating and alumite treatment may be used. Although the heat radiating member 40 in the light-emitting device of the example shown in FIGS. 1-5 is a plate-shaped body, the shape is not limited, A block-shaped thing may be sufficient and the box-shaped thing which accommodates the board | substrate 20 may be sufficient. Further, as in the case of a so-called heat sink, in order to increase the surface area and efficiently radiate heat, the heat radiating members 43 and 44 of the example shown in FIG. May be.

(Pressing member)
The pressing member 50 may be any member that is interposed between the substrate 20 and the cover member 30 and can press the substrate 20 against the heat radiating member 40, and can be formed of various materials. For example, resin materials such as polycarbonate, ABS, acrylic, PA, and PBT are relatively easy to mold and are also preferable from the viewpoint of insulation with respect to the wiring of the substrate 20 and the light source 10. Although not essential, it is preferable that the pressing member 50 itself has elasticity, and the resin material as described above is also preferable from this viewpoint. In addition, for example, it can be formed of a metal material such as carbon steel, copper alloy, and stainless steel for springs. In the case where the pressing member 50 is a light reflector, a resin molded body such as polycarbonate, ABS, or acrylic is vapor-deposited and plated with a highly light-reflective metal film such as aluminum or silver, or an aluminum plate. Can be formed by pressing. Furthermore, the reflecting surface may be subjected to a roughening process such as blasting to have a light diffusion effect.

(cap)
The cap 70 is a member that covers and holds end portions in the x direction of the cover member 30 and the heat dissipation member 40 from the outside. The cap 70 is fitted into a cylindrical body composed of the cover member 30 and the heat radiating member 40 to seal the cylindrical body and to compensate for the pressing force by the cover member 30 particularly at the end of the cylindrical body. can do. The material of the cap 70 is not particularly limited, but a resin such as ABS, polycarbonate, polypropylene (PP), or polyacetal (POM) is suitable. Moreover, you may form with metal materials, such as an aluminum alloy.

<Embodiment 2>
FIG. 8A is a schematic perspective view showing the overall appearance of the light emitting device 200 according to Embodiment 2, and FIG. 8B is a schematic perspective view showing the internal configuration thereof, and FIG. These are the schematic cross-sectional views which show an example of the cross section. FIG. 9A is a schematic perspective view showing the pressing member 55 in the light emitting device 200, FIG. 9B is a schematic top view thereof, and FIG. 9C is FIG. 9B. It is a general | schematic cross-sectional view which shows the CC cross section in). In the light emitting device of the example shown in FIGS. 8 and 9, the description of the components that are substantially the same as those of the first embodiment is omitted as appropriate. In the second embodiment, the definition of the direction is performed except that two orthogonal directions (axes) in a plane parallel to the substrate surface are the x direction (x axis) and the y direction (y axis). It is the same as that of Form 1.

  The light emitting device 200 in the example shown in FIGS. 8 and 9 includes a heat radiating member 45, a substrate 23 mounted on the heat radiating member 45 and mounted with a plurality of light sources 10, a cover member 34 covering the substrate 23, And a pressing member 55 interposed between the substrate 23 and the cover member 34. The light emitting device 200 is a light emitting device having a substantially circular shape in a plan view and having the upper surface of the cover member 34 as a main light emitting surface and a central axis R as an optical axis, for example, an illumination device such as a downlight. it can.

  The substrate 23 has a circular shape in a plan view, and has a light source 10 at a substantially center of the substrate, and a center so as to be positioned at each vertex of a substantially regular hexagon centering on the light source 10. Six light sources 10 separated from each other by an inter-distance p (interval d) are arranged and mounted. As described above, one light source 10 may be disposed substantially at the center of the substrate and a plurality of concentric circles centering on the light source 10, and the light source groups arranged on the concentric circles in this manner are arranged in the in-plane direction of the substrate. A plurality may be provided.

  A plurality of pressing members 55 are provided on the substrate 23 and are arranged corresponding to the respective light sources 10. In this way, by providing the pressing member 55 separately in a plurality, the controllability of the distribution of the pressing force in the surface of the substrate 23 can be enhanced. In particular, as in the present example, it is preferable that the pressing members 55 are provided corresponding to the individual light sources 10 so that the vicinity of the light sources 10 of the substrate 23 can be strongly pressed against the heat radiation member 45.

  The pressing member 55 has a cylindrical light reflecting portion 67 surrounding the light source 10. In particular, the light reflecting portion 67 is cylindrical and has an outer diameter on the lower side smaller than that on the upper side. Thereby, the pressing force applied to the upper part (particularly the convex part 60) of the pressing member can be transmitted while being concentrated on the lower part (bottom part), and the substrate 23, particularly the vicinity of the light source 10, can be strongly pressed against the heat radiating member 45. . Further, with such a pressing member 55, the bottom surface of the light reflecting portion 67 is annular, so that the substrate surface around the light source 10 can be pressed evenly. In order to efficiently press the substrate 23 by the pressing force applied to the upper portion of the pressing member, the inclination angle of the outer surface of the light reflecting portion 67 is preferably 0 ° to 45 °. Similarly, the inner surface of the light reflecting portion 67 has a smaller diameter on the lower side than on the upper side, so that the light emitted from the light source 10 can be efficiently reflected upward and taken out to the outside.

  In addition, a plate-like portion 63 projecting like a bowl is provided on the upper part of the light reflecting portion 67, and the convex portion 60 is provided on the upper surface of the plate-like portion 63. Further, as shown in the drawing, a pair of notches 62 is provided on a part of the plate-like portion 63 with two of the convex portions 60 interposed therebetween, and an elastic portion 61 is formed. In the pressing member 55 having such a configuration, a plurality of convex portions 60 are provided at intervals of the same angle in the rotation direction with the central axis r of the pressing member 55 as a rotation axis (hereinafter, “equal distribution”). Is preferable. Thereby, the inclination of the pressing member 55 can be suppressed and the substrate 23 can be efficiently pressed against the heat radiating member 45. In this case, it is preferable that three or more convex portions 60 are provided. In the two convex portions 60 with an interval of 180 °, the pressing member 55 may be inclined in a direction perpendicular to the straight line connecting the two convex portions, but by providing three or more convex portions 60, Can suppress it. In particular, in the light emitting device 200, four convex portions 60 are provided at approximately 90 ° intervals in the rotation direction with the central axis r as the rotation axis.

  In addition, the pressing member 55 has a column portion 64 outside the light reflecting portion 67. This support | pillar part 64 is a plate-shaped body, Comprising: It is provided in the outer surface of the light reflection part 67, and the back surface (lower surface) of the plate-shaped part 63, and has the function to support and reinforce the plate-shaped part 63. . Further, the bottom surface of the pressing member 55 includes an annular bottom surface of the light reflecting portion 67 and a bottom surface of the column portion 64 projecting outward from the light reflecting portion 67, and the pressing member 55 is formed by the projecting column portion 64. It is easy to suppress the tilt.

  In the pressing member 55 of the present embodiment, the path connecting the convex portion 60 that is the power point and the bottom surface of the light reflecting portion 67 that is the action point in the member is close to a straight line, and thus acts on the convex portion. The pressing force can be efficiently transmitted to the bottom surface of the light reflecting portion. Therefore, since the support | pillar part 64 can function as a site | part which mainly suppresses the inclination of the pressing member 55, it does not depend on arrangement | positioning of the convex part 60, but can change the shape and arrangement | positioning into various forms. it can. As a result, the support | pillar part 64 may be abbreviate | omitted. In particular, in this pressing member 55, four support columns 64 are arranged at approximately 90 ° intervals in the rotation direction with the central axis r as the rotation axis so as to be positioned between the protrusions 60 and 60. Is provided. Thus, it is preferable that the support | pillar part 64 is also substantially arrange | positioned in the rotation direction by setting the central axis r as a rotating shaft. Thereby, the inclination of the pressing member 55 can be effectively suppressed. The pressing member 55 having such a shape can be manufactured by injection molding if it is a resin material, for example, and can be manufactured by casting or pressing if it is a metal material.

  Four protrusions 39 are provided at the outer edge of the cover member 34, more specifically at the lower part of the side surface, with the central axis R as the rotation axis and approximately equally spaced at 90 ° intervals in the rotation direction. Similarly, on the outer edge portion of the heat dissipating member 45, four locking portions 49 that are substantially equally spaced at intervals of 90 ° are erected, and the locking portion 49 has a hole for locking the protrusion 39. Is provided. The cover member 34 is held by the heat radiating member 45 and the pressing member 55 is held against the substrate 23 by engaging the projection 39 of the cover member with the hole of the locking portion 49 of the heat radiating member 45. And press.

  At this time, the convex portion 60 of the pressing member 55 first comes into contact with the inner surface of the cover member 34, and the elastic portion 61 is bent downward by the pressing force, and the pressing force transmitted to the bottom surface of the pressing member 55 The substrate 23 can be pressed against the heat dissipation member. Finally, the upper surface of the plate-like portion 63 of the pressing member 55 and the inner surface of the cover member 34 may contact each other. As shown in the figure, the convex portion 60 is hemispherical, the contact portion between the convex portion 60 and the cover member 34 is dotted, and the contact width between the convex portion 60 and the cover member 34 is an interval. It is smaller than d.

  In the light-emitting device of the present embodiment, the number, arrangement, and interval of the light sources 10 are not limited, and the light sources 10 may be arranged at equal intervals in a plurality of rows and columns, or the interval, number in each column or each row. May be changed or arranged irregularly. Here, an example in which the pressing member 55 is provided separately in a plurality is shown, but the present invention is not limited to this, and a single pressing member may be used. For example, in this example, a pressing member having a plurality of light reflecting portions 67 surrounding each light source 10 and having a common single plate-like portion 63 connected to each light reflecting portion may be used. Further, in the light emitting device 200, the upper surface of the cover member 34 serving as the light emitting surface of the device is substantially flat, but an optical member such as a lens for condensing or diffusing light is separately provided on the cover member 34. Also good.

<Example 1>
Examples according to the present invention will be described in detail below. Needless to say, the present invention is not limited to the following examples.

  The light-emitting device of Example 1 is an example of the light-emitting device according to Embodiment 1, and is used as interior lighting of a freezer / refrigerated reach-in showcase. In the light emitting device of the first embodiment, the heat dissipation member 40 is a galvanized steel (SECC) sheet metal having a thickness of about 1 mm, and has a substantially rectangular shape with a length in the x direction of about 1.3 m in plan view. In a cross section parallel to the yz plane, it extends by being bent in a substantially L shape so that a step with the central portion is approximately 6 mm on both sides of the substantially flat plate-shaped central portion having a width of approximately 23.5 mm. And a distal end of the extended portion has a flange portion 48 bent into a hook shape. The upper surface of the flange portion 48 is located about 2 mm below the upper surface of the central portion. In addition, the full width of the y direction of a heat radiating member is about 40 mm.

  Attachment members 47 for attaching the light emitting device to the outside are provided at both ends in the x direction on the lower surface (back surface) side of the heat radiation member 40. The mounting member 47 is a galvanized steel sheet metal that is the same as the heat radiating member 40, one end of which is connected to the lower surface of the central portion of the heat radiating member 40, and is bent into a substantially L shape so An extension hole is provided in the extension part. If the mounting member 47 has such a shape, the lower surface of the heat radiating member 40 is separated from the surface on which the light emitting device is mounted, that is, the external installation surface (in this example, about 4 mm), and an external power source disposed in the vicinity of the device. In addition, the influence of heat from a heater or the like for preventing condensation can be reduced.

  A glass epoxy substrate 20 having a length in the x direction that is substantially the same as that of the heat radiating member 40 is provided on the upper surface of the central portion of the heat radiating member 40. In the x direction on the upper surface of the substrate 20, 18 light sources 10 are arranged with a center-to-center distance of 60 mm (interval d is about 55 mm), mounted on the wiring, and connected in series with each other. In the y direction, two rows of such light sources 10 are provided at an interval of 4 mm, and the first row of light sources 10 is 30 mm in the x direction with respect to the second row of light sources 10. Each is displaced. The light source 10 is a surface-mounted light-emitting device capable of emitting white light having a nitride semiconductor LED element coated with a resin containing a YAG phosphor. A connector 29 connected to the wiring is provided at one end of the substrate 20 in the x direction, and a power supply cable for supplying power to the light source 10 is connected to the connector 29.

  Twelve pressing members 50 are provided on the substrate 20 and are light reflectors each having three light reflecting portions 65. The pressing member 50 is a molded product of white polycarbonate resin having a thickness of about 1.5 mm, and an aluminum alloy film is deposited on the inner surface (reflective surface) of each light reflecting portion 65. The height (upper surface-lower surface width) is about 24 mm. Further, the pressing member 50 has one plate-like portion 63 (width of about 11.5 mm) connected to the three light reflecting portions 65 above the three light reflecting portions 65. The plate-like portion 63 has two sets of notches 62 (distance between the centers of about 9 mm) each having a width of about 2 mm × 7 mm at two portions located between the light reflecting portions 65 and 65. The portion sandwiched between the notches 62 is an elastic portion 61. The elastic portion 61 is provided with a convex portion 60 made of a part of a substantially spherical surface having a diameter of about 2.5 mm and a height of about 0.7 mm. In addition, a column portion 64 is provided on the back side of the plate-like portion 63 on the light reflecting portion 65 side of the notch 62. This support | pillar part 64 is flat form, and the width | variety is so small that it goes below from the back surface of the plate-shaped part 63. As shown in FIG. The pressing member 50 is formed on the upper surface of the substrate 20 so that the curved reflecting surface of the light reflecting portion 65 opens at the end of the substrate 20 in the y direction and covers the upper side and the side of the light source 10, respectively. is set up. The pressing members 50 are arranged in two rows back to back along the x direction, and are temporarily fastened by positioning positioning portions 68 having a height of about 1 mm into the holes 28 of the substrate 20.

  The cover member 30 is made of a translucent polycarbonate resin having a thickness of about 1.5 mm. The cover member 30 is substantially the same length as the heat radiating member 40 in the x direction and has a substantially inverted U-shaped cross section (high height). About 30 mm). In addition, at both lower ends of the cover member 30 in the y direction, flanges 37 projecting about 3 mm outward are provided. Then, the cover member 30 is held with its flange 37 locked to the flange 48 of the heat radiating member. Thereby, the pressing member 50 is sandwiched and fixed between the cover member 30 and the heat radiating member 40. At this time, the pressing member 50 receives a pressing force from the cover member 30, the convex portion 60 comes into contact with the inner surface of the cover member 30, the elastic portion 61 bends, and the substrate 20 is pressed against the heat radiating member 40 by its bottom surface.

  Finally, the caps 70 are fitted into both ends of the cylindrical body constituted by the cover member 30 and the heat dissipation member 40, respectively. The cap 70 is a molded body of black polycarbonate resin, and has a flange on the inside, and the flange is locked and fixed to the opening of the mounting member 47. Note that the power feeding cable is rotated from the connector 29 of the substrate 20 through the lower surface side of the heat radiating member 40 and the inside of the joint portion of the mounting member 47 to be pulled out of the apparatus, and is sandwiched between the cap 70 and the mounting member 47. .

<Comparative Example 1>
The light emitting device of Comparative Example 1 is manufactured in the same manner as the light emitting device of Example 1 except that the convex portion 60, the elastic portion 61 (notch 62), and the column portion 64 of the pressing member 50 in Example 1 are not formed.

  In the light emitting device of Comparative Example 1, if the substrate 20 or the heat radiating member 40 is warped or undulated, a partial gap between the substrate 20 and the heat radiating member 40, that is, floating of the substrate 20 may be observed. In the light emitting device of Example 1, such a gap is not observed, the adhesion between the substrate 20 and the heat dissipation member 40 is improved, and the heat dissipation of the light source 10 is improved.

  The light emitting device of the present invention includes various illumination light sources such as general illumination, internally illuminated signboards, and externally illuminated signboards, backlight light sources such as LED displays and liquid crystal display devices, traffic lights, illumination switches, various sensors, and various indicators. Etc. can be suitably used.

DESCRIPTION OF SYMBOLS 10 ... Light source 20, 21, 22, 23 ... Board | substrate, 28 ... Hole of board | substrate, 29 ... Connector 30, 31, 32, 33, 34 ... Cover member, 37 ... collar part, 38 ... collar part (cover member), 39 ... Projection part 40, 41, 42, 43, 44, 45 ... Radiation member, 46 ... Recess, 47 ... Mounting member, 48 ... Gutter part (heat radiation member), 49 ... Locking part 50, 51, 52, 53, 54 , 55 ... pressing member, 60 ... convex part, 61 ... elastic part, 62 ... notch, 63 ... plate-like part, 64 ... column part, 65, 66, 67 ... light reflecting part, 68 ... positioning part, 69 ... Buttock (pressing member)
70 ... Cap 80 ... Screw, 81 ... Clip 100, 200 ... Light emitting device

Claims (8)

A heat dissipating member;
A substrate mounted on the heat radiating member and having a plurality of light sources arranged at intervals d on the upper surface;
A cover member that is held by the heat dissipation member and covers the substrate;
A pressing member that is interposed between the substrate and the cover member and presses the substrate against the heat dissipation member,
The pressing member has a convex portion that comes into contact with the substrate or the cover member,
The light emitting device in which a contact width between the convex portion and the substrate or the cover member in the arrangement direction of the plurality of light sources is smaller than the distance d.   The light emitting device according to claim 1, wherein a contact portion between the convex portion and the substrate or the cover member has a dot shape.   The light emitting device according to claim 1, wherein the convex portion is provided between the light sources. The light sources are arranged in a plurality of rows,
The convex portion is provided between the light sources in each row of the light sources,
The said light source and the said convex part are any one of the Claims 1 thru | or 3 arrange | positioned so that the said convex part in a 1st row | line | column and the said light source of the 2nd row | line | column adjacent to this 1st row | line | column may be adjacent. The light emitting device according to 1. The pressing member is a member provided on the substrate separately from the substrate and the cover member,
The light emitting device according to claim 1, wherein the convex portion is in contact with only the cover member.   The light-emitting device according to claim 5, wherein the pressing member has a plurality of light reflecting portions each surrounding the light source. The pressing member has a plate-like portion having a substantially flat upper surface, and a column portion provided on the back side of the plate-like portion to support the plate-like portion,
The light emitting device according to claim 6, wherein the convex portion is provided on the plate-like portion, and the column portion is provided close to the convex portion. Each of the light reflecting portions has a reflection surface that reflects light from the light source to the side of the device,
The plate-like portion is connected to the plurality of light reflecting portions and provided above the light reflecting portion,
The light emitting device according to claim 7, wherein the convex portion and the column portion are provided between the light reflecting portions.

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