JP2011165387A - Light-emitting device and line light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device and a line light source device with superb heat radiation, without the need to enlarge the light-emitting device. <P>SOLUTION: The light-emitting device 1 is provided with a rod-like long light guide body 3, and an LED 7 emitting light towards an incident surface receiving light from an end surface of a long side direction of the light guide body. The LED is mounted on a substrate 5 with a copper plate, the substrate comes in contact with a metal case structuring member 2 supporting the light guide body, and also structures a case housing the light guide body collaborating with the case structuring member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light emitting device and a line light source device.

  As a light emitting device using an LED (Light Emitting Diode) as a light source, the following has been proposed. That is, as a light emitting means having a light emitting surface whose length is longer than the width, an LED as a light source, a holding member for holding the LED, and light from the LED is introduced from the end surface and emitted from the side surface as the light emitting surface. A light-emitting device having a light guide plate is known (see Patent Document 1). The light guide plate of the light emitting device is accommodated in the housing via a reflection sheet. The housing fixes the position of the light guide plate and the holding member. Furthermore, the magnet for attaching this light-emitting device to a target object is arrange | positioned on the surface which forms the longitudinal direction of a housing | casing (refer patent document 1).

JP 2009-187762 A

  However, the light emitting device described in Patent Document 1 employs a configuration in which an LED mounted on a substrate is held by a holding member, and the holding member is fixed in position by a housing. This holding member also plays a role of releasing heat generated by the LED. Therefore, in consideration of heat dissipation, this holding member is necessary. On the other hand, the light emitting device becomes larger in the longitudinal direction by the amount of the holding member.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a light emitting device and a line light source device that have good heat dissipation without increasing the size of the light emitting device.

  In order to achieve the above object, a light emitting device of the present invention comprising a rod-shaped long light guide and a light emitting member that makes light incident from an end surface in the longitudinal direction of the light guide, the light emitting member is a metal plate or ceramic. A housing that is mounted on a substrate having a plate, and that the substrate is in contact with a metal or ceramic housing constituent member that supports the light guide and that houses the light guide in cooperation with the housing constituent member Is configured.

  Here, it is preferable that a space extending in parallel with the longitudinal direction of the light guide is provided inside the housing, and a wiring for supplying power to the light emitting member is disposed in the space.

  In addition, it is preferable to provide at least both ends of the casing with a holder that holds the casing and fixes the casing to the installation location.

  In order to achieve the above object, in the line light source device of the present invention, a plurality of light emitting devices of the present invention are installed adjacent to each other in the longitudinal direction, and the adjacent light emitting devices are electrically connected.

  Here, in the portion where the light emitting device is adjacent, the substrate of the adjacent light emitting device is opposed, and a protruding portion having a concave portion is provided on one of the opposing substrates, and a protruding portion having a convex portion is provided on the other side. And the adjacent light emitting devices can be fixed by fitting the concave portion and the convex portion.

  According to the present invention, it is possible to provide a light emitting device and a line light source device with good heat dissipation without increasing the size of the light emitting device.

1 is a schematic perspective view showing a configuration of a light emitting device according to an embodiment of the present invention. It is a disassembled perspective schematic diagram of the light-emitting device shown in FIG. FIG. 2 is a wiring diagram of the light emitting device shown in FIG. 1. It is a perspective view which shows the light-emitting device of the state which attached the holder to the light-emitting device shown in FIG. It is a side view which shows the state which hold | maintains the light-emitting device shown in FIG. 1, and the holder is being fixed to the ceiling. It is a figure which shows the line light source device which concerns on embodiment of this invention, Comprising: It is a figure which shows the state in which the light-emitting device which comprises the line light source device is installed in multiple numbers adjacent to the elongate direction. FIG. 6 is a wiring diagram of the line light source device shown in FIG. 5. The 1st modification of the light-emitting device and line light source device which concerns on embodiment of this invention is shown. The 2nd modification of the light-emitting device and line light source device which concern on embodiment of this invention is shown.

  Hereinafter, configurations of a light emitting device and a line light source device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view showing a configuration of a light emitting device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective schematic view of the light emitting device 1. A long rectangular column-shaped light guide 3 that guides light using acrylic resin as a main raw material is provided in the inside of the long first casing member 2 having a U-shaped cross section that is an aluminum molded body. The housing constituent member 2 is accommodated in the longitudinal direction. At both ends in the longitudinal direction of the light guide 3, reflectors 4 that guide light emitted from LEDs, which will be described later, into the light guide 3 are disposed.

  A 1 mm-thick substrate 5 having a hexagonal copper plate is disposed at both ends in the longitudinal direction of the first housing component 2. The substrate 5 is a second casing constituent member. The substrates 5 and 5 are fixed directly to the first housing component 2 by fixing the metal screws 6 through the holes a of the substrate 5 through the holes b of the first housing component 2. In contact. An LED 7 is mounted on the substrate 5 at a position facing the reflector 4 described above. And the board | substrate 5 comprises the housing | casing which accommodates the light guide 3 in cooperation with the cover 12 used as the 1st housing | casing structural member 2 and the 3rd housing | casing structural member mentioned later.

  Most of the light emitted from the LED 7 is introduced directly into the light guide 3 or after being reflected by the reflector 4 into the light guide 3. That is, the two LEDs 7, 7 arranged on both ends of the light guide 3 enter the light from both ends of the light guide 3 in the longitudinal direction. The incident light is radiated from the exit surface 8 of the light guide 3 to the outside. That is, the light from the LEDs 7, 7 is emitted from the emission surface 8, which is the portion exposed from the first casing component 2 having a U-shaped cross section, among the rectangular columnar side surfaces of the light guide 3.

  Further, the space 11 along the longitudinal direction of the first casing component 2 that is not occupied by the light guide 3 and the reflector 4 in the first casing component 2 is the third dimension. It is covered with a cover 12 which is a casing constituent member. The cover 12 is fixed to the first casing component member 2 by allowing the screw 13 to pass from the hole c of the cover 12 to the hole d of the first casing component member 2. In the space 11, wiring for supplying power from one LED 7 side to the other LED 7 side is arranged along the longitudinal direction. The wirings are collected by a molding, and the molding is fixed to the inner wall of the first housing component 2 by a double-sided tape (not shown).

  FIG. 3 is a wiring diagram of the light emitting device 1. The two LEDs 7 are connected in series to a DC power supply (not shown). A wiring 7 a that connects the two LEDs 7 and 7 and a wiring 7 b that returns to the DC power supply are arranged in the space 11.

  Further, FIG. 2 shows a holder 15 that holds the light emitting device 1 and realizes fixing to a member (wall, ceiling, etc.) to which the light emitting device 1 is fixed. FIG. A state in which the tool 15 is incorporated is shown. FIG. 5 is a side view showing a state in which the holder 15 holds the light emitting device 1 and the holder 15 is fixed to the ceiling 16. The holder 15 holds the portions of the substrate 5 at both ends of the light emitting device 1. The holder 15 is a belt-shaped resin molded body and has a shape bent along the shape of the edge of the substrate 5 except for the direction of the cover 12. The holder 15 includes two pressing portions 15a and 15a into which the two triangular portions 5a of the substrate 5 are fitted, and a flat portion 15b that connects the two pressing portions 15a and 15a. The holder 15 and the ceiling 16 are fixed by bonding and fixing the flat portion 15 b and the ceiling 16 with the double-sided adhesive tape 17.

  FIG. 6 is a diagram showing the line light source device 21 according to the embodiment of the present invention, and shows a state in which a plurality of light emitting devices 1 are installed adjacent to each other in the longitudinal direction. Here, the distance W between the emission surfaces 8 of the adjacent light emitting devices 1 is preferably as short as possible. The reason is that the portion corresponding to the distance does not emit light and becomes dark, and the brightness of the light emission state of the entire line light source device 21 becomes sparse. In the present embodiment, the distance W is 10 mm.

  FIG. 7 is a wiring diagram of the line light source device 21. Three light emitting devices 1 have terminals AK. Terminals B and C, terminals D and E, terminals G and H, terminals J and K are connected, and terminals A and F are short-circuited. In such a connection state, all the LEDs 7 used in the line light source device 21 are connected in series. That is, the three light emitting devices 1 are connected in series to a DC power source (not shown). In the case of the line light source device 21 using more than three light emitting devices 1, the terminal A and the terminal F are not short-circuited, but are further connected to the terminal of the adjacent light emitting device 1, and the terminal ( Terminal A and a terminal corresponding to terminal F) are short-circuited.

  FIG. 8 shows a first modification of the light emitting device 1 and the line light source device 21 according to the embodiment of the present invention. Since the light emitting device 31 according to the first modification has no difference in configuration from the light emitting device 1 except that the shape of the substrate 5 is different from that in the light emitting device 1, the corresponding members and elements are the same as those in the light emitting device 1. The same reference numerals are given and the description thereof is omitted. The light emitting device 31 is provided with a protrusion having a rectangular parallelepiped convex portion 32 in which one substrate 5 protrudes in the longitudinal direction of the light emitting device 31, and the other substrate 5 different from the one substrate 5 is the light emitting device 31. A protrusion having a recess 33 that protrudes in the longitudinal direction and can be fitted with the protrusion 32 is provided. The connection between the terminals of the line light source device 21 described above is made when the convex portion 32 and the concave portion 33 are fitted together. However, electrical connection may be performed separately.

  FIG. 9 shows a second modification of the light emitting device 1 and the line light source device 21 according to the embodiment of the present invention. Since the light emitting device 41 according to the second modification has no difference in configuration from the light emitting device 1 except that the shape of the substrate 5 is different from that in the light emitting device 1, the corresponding members and elements are the same as those in the light emitting device 1. The same reference numerals are given and the description thereof is omitted. In the light emitting device 41, one substrate 5 has the same convex portion 32 as the light emitting device 31, and the other substrate 5 different from the one substrate 5 is a hole 34 communicating with the space 11 of the light emitting device 31. It has a quadrangular hole 34 (a kind of recess) that can be fitted to the portion 32. The connection between the terminals of the line light source device 21 described above is made when the convex portion 32 and the hole 34 are fitted together. However, electrical connection may be performed separately.

(Main effects obtained by the embodiment of the present invention)
The LED 7 is mounted on a substrate 5 having a copper plate, and the substrate 5 is in direct contact with the first housing member 2 made of aluminum that supports the light guide 3. Therefore, the heat generated by the LED 7 can be efficiently released to the first housing component 2 via the substrate 5. That is, the 1st housing | casing structural member 2 can be utilized as a heat radiating member. Here, the substrate 5 can be made as thin as about 1 mm in thickness, and since it does not have a holding member for holding the LED mounted on the substrate as in the prior art, the light emitting devices 1, 31 and 41 are elongated. The light emitting devices 1, 31, 41 and the line light source device 21 with good heat dissipation can be provided without increasing the size in the direction.

  The substrate 5 is directly fixed to the first housing component 2 by metal screws 6 that are fixtures. Therefore, the contact state between the substrate 5 and the first housing component 2 can be made stronger. Moreover, since the screw 6 is made of metal, it also functions as a heat radiating member.

  Further, wirings 7 a and 7 b for supplying power to the LEDs 7 are arranged in the space 11 in the first housing component 2. Therefore, the power supply wirings 7a and 7b to the respective LEDs 7 of the light emitting device 1 using the two LEDs 7 can be collected in one place, and the handling property can be improved.

  In addition, the light emitting devices 1, 31, 41 and the line light source device 21 include a holder 15 that holds the first housing component 2 and is fixed to an installation place such as the ceiling 16. Therefore, it becomes easy to install the light-emitting devices 1, 31, 41 and the line light source device 21 at the installation location. Further, as shown in FIG. 5, the holder 15 has a shape bent along the shape of the edge of the substrate 5 except for the portion on the emission surface 8 side of the light emitting device 1. Therefore, it is not necessary to provide a mounting screw hole on the housing side, and more compact light emitting devices 1, 31, 41 and line light source device 21 can be provided.

  Moreover, when the line light source device 21 which concerns on embodiment of this invention uses the light-emitting devices 31 and 41, the board | substrate 5 which the adjacent light-emitting devices 31 and 41 have opposes in the part which adjoins them, A concave portion 33 or a hole 34 is provided on one of the opposing substrates 5, and a convex portion 32 is provided on the other, and the light emitting devices 31 and 41 adjacent to each other when the concave portion 33 or the hole 34 and the convex portion 32 are fitted. Is fixed. Therefore, when manufacturing the line light source device 21 using the light emitting device 31, the line light source device 21 can be manufactured easily and with a strong bonding force by fitting the convex portion 32 and the concave portion 33 together. Similarly, when manufacturing the line light source device 21 using the light emitting device 41, the line light source device 21 can be manufactured easily and with a strong bonding force by fitting the convex portion 32 and the hole 34 together. Further, the line light source device 21 using the light emitting device 41 can reduce the above-described distance W. Further, the convex portion 32 has a rectangular parallelepiped shape, the concave portion 33 that can be fitted to the convex portion 32 also has a rectangular parallelepiped shape, and the hole 34 has a quadrangular shape. Therefore, in the state where the adjacent light emitting devices 31 and 41 are fitted and fixed, they do not rotate.

  The outer shape of the substrate 5 is a hexagon, and the first housing component 2 is a long object having a U-shaped cross section. For this reason, the shapes of the end surfaces of the substrate 5 and the first casing component member 2 are not the same, and the substrate 5 protrudes from the end surface of the first casing component member 2 in the short direction of the first casing component member 2. Yes. Therefore, the protruding portion of the substrate 5 can function as a highly efficient heat dissipation member.

  Further, in the light emitting devices 1, 31, 41 and the line light source device 21 according to the embodiment of the present invention, all the LEDs 7 are connected in series. Therefore, the number of input terminals can be reduced, and the circuit configuration for power supply is not complicated.

(Other forms)
The light-emitting devices 1, 31, and 41 according to the embodiment of the present invention enter light from a long rod-shaped light guide 3 and an incident surface through which light enters from the longitudinal end face of the light guide 3. LED7 to be provided. And LED7 is mounted in the board | substrate 5 which has a copper plate, and the board | substrate 5 is contacting the metal 1st housing | casing structural member 2 which supports the light guide 3, and the 1st housing | casing structural member. 2 and the cover 12 constitute a housing for housing the light guide 3.

  However, the substrate 5 may have a metal plate other than a copper plate, such as an aluminum plate, a stainless steel plate, or a silver plate, or a ceramic plate made of alumina, aluminum nitride, or the like. Further, the first housing component 2 is not made of aluminum, but may be made of other metals such as copper, stainless steel, silver, or ceramic made of alumina, aluminum nitride, or the like. In addition, although LED7 is arrange | positioned at the both ends of the elongate direction of the 1st housing | casing structural member 2, you may arrange | position only at one end. Further, the substrate 5 is in direct contact with the first housing component 2, but may be in indirect contact. Here, indirect contact is a state in which heat transfer from the substrate 5 to the housing 2 is possible via a metal plate, a resin film, or the like of a member other than the substrate 5 and the first housing component 2.

  Further, the substrate 5 is fixed to the first housing component 2 by metal screws 6 that are fixtures. However, the fixture is not necessarily required, and for example, the substrate 5 and the first housing component 2 may be welded. Further, the fixture is not limited to the screw 6 but may be another one such as an adhesive. However, it is preferable to use the screw 6 because the light emitting devices 1, 31, 41 can be easily manufactured. Moreover, although the screw 6 is made of metal, a screw made of ceramic, resin, or the like may be used.

  In addition, a space 11 extending in parallel with the longitudinal direction of the light guide 3 is provided in the first housing component 2, and wirings 7 a and 7 b for supplying power to the LEDs 7 are provided in the space 11. Is arranged. However, this wiring may be arranged on the outer surface instead of in the first housing component 2. Further, the power supply wirings 7a and 7b to the two LEDs 7 may take different paths, and the two wirings do not need to be collected.

  Further, the light emitting devices 1, 31, and 41 include the holders 15 that hold the first casing component 2 and fix the first casing component 2 at an installation location such as the ceiling 16 at both ends of the first casing component 2. . However, the holder 15 is not always necessary. In addition, the holder 15 may be installed in addition to both ends of the first housing component 2 or in a portion other than both ends. Further, the holder 15 and the ceiling 16 are bonded and fixed by the double-sided adhesive tape 17, but a fixing member other than the double-sided adhesive tape 17, for example, Velcro (registered trademark) or the like can be used. The holder 15 has a shape that is bent along the shape of the edge of the substrate 5 except for the portion on the emission surface 8 side of the light emitting device 1, and holds the portion of the substrate 5 in the light emitting device 1. is doing. However, the shape of the holder 15 can be changed as appropriate, and the holding position can be different from the portion of the substrate 5, for example, a side portion of the housing 2. By making the position of the light-emitting device 1 held by the holder 15 the side surface portion of the first casing component member 2, the heat dissipation of the substrate 5 is not hindered, and the holder 15 is not heated excessively. preferable. However, the holder 15 may be heated excessively. Moreover, since the holder 15 is also a heat radiating member by configuring the holder 15 with a metal, ceramic, or the like having high thermal conductivity, more preferable light emitting devices 1, 31, 41 can be provided.

  In the line light source device 21 according to the embodiment of the present invention, a plurality of light emitting devices 1, 31, 41 are installed adjacent to each other in the longitudinal direction, and the adjacent light emitting devices 1, 31, 41 are electrically connected. Is done. In the embodiment of the present invention, the adjacent distance W described above is 10 mm. However, this distance W may be other than 10 mm. However, in order to make the brightness of the light emission state uniform in the entire line light source device 21, the distance W is preferably 15 mm or less, and more preferably 10 mm or less.

  In the line light source device 21, the substrate 5 included in the adjacent light emitting devices 31 and 41 is opposed to the portion where the light emitting devices 31 and 41 are adjacent to each other, and a concave portion 33 or a hole 34 is provided on one of the opposed substrates 5. The projection 32 is provided on the other side, and the recess 33 or the hole 34 and the projection 32 are fitted to each other and the adjacent light emitting devices 31 and 41 are fixed to each other. However, the convex portion 32, the concave portion 33 and the hole 34 are not necessary. For example, the adjacent light emitting devices 31 and 41 are fixed to each other by holding and fixing the outer surface of the first housing component 2. Also good. Moreover, the convex part 32 is a rectangular parallelepiped shape, the recessed part 33 which can be fitted with the convex part 32 is also a rectangular parallelepiped shape, and the hole 34 is a quadrangle. However, the shape of the convex part 32 and the recessed part 33 is not restricted to a rectangular parallelepiped, It is good also as shapes, such as a triangular prism, a cylinder, an elliptic cylinder. Further, the shape of the hole 34 is not limited to a quadrangular shape, and may be a triangular shape, a circular shape, an elliptical shape, or the like. Further, the light emitting device 41 may be provided with a concave portion that is recessed from the surface of the substrate 5 toward the space 11 side and can be fitted with the convex portion 32 without providing the hole 34.

  The outer shape of the substrate 5 is a hexagon, and the first housing component 2 is a long object having a U-shaped cross section. However, the outer shape of the substrate 5 may be a shape that substantially follows the cross-sectional shape of the housing 5 or a shape such as a square shape. Further, the thickness of the substrate 5 is 1 mm. From the viewpoint of improving heat dissipation, it is better that the thickness is thicker, but from the viewpoint of preventing the light emitting devices 1, 31 and 41 from being stretched in the longitudinal direction. It is better to reduce the thickness. Considering these viewpoints comprehensively, the thickness of the substrate 5 is preferably in the range of 0.5 mm to 5 mm.

  Further, in the light emitting devices 1, 31, 41 and the line light source device 21 according to the embodiment of the present invention, all the LEDs 7 are connected in series. However, some or all of the LEDs 7 are not connected in series, but the LEDs 7 are individually provided with power supply wiring, and the light emitting devices 1, 31, 41 and the line light source device 21 have a plurality of sets of input terminals. Also good. The wirings for the plurality of sets of input terminals may be routed through the space 11.

1, 31, 41 Light-emitting device 2 First housing component 3 Light guide 5 Substrate (second housing component)
7 LED
12 Cover (third casing component)
15 Holder 16 Ceiling (Installation location)
21 Line light source device 32 Convex part 33 Concave part 34 Hole (concave part)

Claims (5)

In a light emitting device comprising a rod-shaped long light guide and a light emitting member that makes light incident from an end surface in the long direction of the light guide,
The light emitting member is mounted on a substrate having a metal plate or a ceramic plate,
The substrate is in contact with a metal or ceramic housing constituent member that supports the light guide, and constitutes a housing for housing the light guide in cooperation with the housing constituent member. A light emitting device characterized by that. The light-emitting device according to claim 1.
A space extending in parallel with the longitudinal direction of the light guide is provided inside the housing, and wiring for supplying power to the light emitting member is disposed in the space. apparatus. The light emitting device according to claim 1 or 2,
A light emitting device comprising: a holder for holding the casing and fixing the casing to an installation location at least at both ends of the casing.   A line light source device, wherein a plurality of light emitting devices according to claim 1 are installed adjacent to each other in the longitudinal direction and the adjacent light emitting devices are electrically connected. The line light source device according to claim 4,
In the portion where the light emitting device is adjacent, the substrate of the adjacent light emitting device is facing,
One of the opposing substrates is provided with a protrusion having a recess, and the other is provided with a protrusion having a protrusion.
The line light source device, wherein the concave portion and the convex portion are fitted and the adjacent light emitting devices are fixed to each other.

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