JP2015173193A - light source unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit in which the degree of freedom of connection between light source units is enhanced by increasing and decreasing the number of LED elements easily, and shortening the wire for connecting them.SOLUTION: A light source unit 1 includes a base 2, and a substrate 3 disposed on the base 2 excepting the mounting region 2a, and on which wiring patterns 4, 5 are formed along the mounting region 2a. Light emitting diode elements 6 are connected in series to form blocks, and respective blocks are mounted in the mounting region 2a while spaced apart from each other. Since the a plurality of LED elements 6 are connected in series to form the LED element blocks 6B, and a plurality of the LED element blocks 6B are provided, the amount of light can be adjusted by increasing and decreasing the number of LED elements 6 or the number of LED element blocks 6B easily. Since the LED elements 6 are arranged to be stretched between the wiring patterns 4, 5, the wires 7, 8 can be shortened.

Description

  The present invention relates to a light source unit using a light emitting diode, and more particularly to a light source unit with increased light quantity adjustment and connection flexibility.

  2. Description of the Related Art Conventionally, a light source unit using a light emitting diode has a printed board bonded on an elongated base, and a plurality of light emitting diodes (hereinafter abbreviated as “LEDs”) on the upper surface of the base exposed from a through-hole in the center of the printed board. ) The elements were mounted aligned in the longitudinal direction, and the LED elements were connected to the wiring patterns on the printed circuit board provided along the through-holes with wires and sealed with sealing resin. (See, for example, Patent Documents 1 and 2).

  In addition, the wiring pattern in the light source unit is simply provided with electrodes at one end or electrodes at both ends.

JP 2006-295085 A JP 2007-109404 A

  In the above conventional light source unit, the LED element is arranged at the center of the base in the through hole of the printed circuit board and wire-bonded to the wiring pattern provided on the printed circuit board around the LED element. There was a need to do. Thus, when the wire which connects an LED element becomes long, when sealing with sealing resin, there existed a possibility that a wire might be cut | disconnected.

  In general, in order to adjust the amount of light in this type of light source unit, it is necessary to increase or decrease the number of LED elements. In the conventional light source unit, since the LED elements are aligned in the longitudinal direction of the base, the number of LED elements is increased or decreased by narrowing or widening the distance while considering the variation in light emission of each LED element, or It was necessary to adjust the length of the base in accordance with the number of LED elements. However, in order to increase the number of LED elements, there is a limit in reducing the distance between the LED elements, and when the distance between the LED elements is too wide, the occurrence of light and darkness and the variation in coloring may be noticeable. Further, when the length of the base is changed, there arises a problem that the structure and standard of the lighting equipment to which the light source unit is attached must be changed.

  In addition, when electrodes are provided only at one end of the wiring pattern or electrodes are provided at both ends, wiring of the light source units may be long and complicated when connected in series or in parallel. The degree of freedom was low.

  The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art, facilitate the increase / decrease of the number of LED elements and shorten the wires connecting them, The object is to provide a light source unit with a high degree of freedom.

  The light source unit of the present invention includes a base having a mounting area set on the upper surface, a substrate disposed on the upper surface of the base excluding the mounting area, and a wiring pattern formed along the mounting area, A plurality of light emitting diode element blocks connected in series in the mounting region and spaced from each other, and connected to the wiring pattern for each block; And a translucent sealing resin for sealing the diode element block.

  Further, the wiring patterns in the light source unit are arranged to face each other with the mounting area interposed therebetween, and the light emitting diode element block is a light emitting device in which a plurality of light emitting diode elements arranged between the wiring patterns are aligned and mounted. It is formed by a diode element array.

  In addition, a plurality of the light emitting diode element rows in the light source unit are provided and are arranged close to each other to form one of the light emitting diode element blocks.

  Further, the light emitting diode element blocks in the light source unit are arranged at equal intervals.

Furthermore, an electrode is provided on at least one end of the wiring pattern in the light source unit.

  In the light source unit of the present invention, a plurality of LED elements are connected in series to form an LED element block, and a plurality of LED element blocks are provided. Therefore, the number of LED elements in the LED element block and the number of LED element blocks The amount of light can be easily increased or decreased according to the application to adjust the amount of light. In particular, when increasing or decreasing the number of LED elements or the number of blocks, a plurality of LED elements are arranged so as to form a block. Can be done. Further, since the plurality of LED elements are mounted so as to form a block, it is not necessary to expand the mounting area of the base even if a large number of LED elements are mounted. Therefore, when obtaining the same amount of light as that of the conventional light source unit in which the LED elements are arranged in a line in the center, the LED elements can be accommodated in a narrower range to be miniaturized.

  In addition, since the plurality of LED elements are arranged so as to be bridged between the wiring patterns, the distance between the adjacent LED elements can be narrowed, and the distance between the LED element located at the end and the wiring pattern can be made closer. it can. Thereby, the wire which aims at the connection of LED elements and the connection of an LED element and a wiring pattern can be shortened, and the disconnection of a wire can be prevented.

  Further, even if a large number of LED elements are mounted, it is not necessary to widen the mounting area, so that a space for providing electrodes formed at the end portions of the wiring pattern can be given a margin. For this reason, it is easy to change the position and number of electrodes, and the connection between the electrodes can be easily changed.

It is a perspective view from the plane side of a light source unit concerning one embodiment of the present invention. It is a perspective view from the bottom face side of the light source unit shown in FIG. It is a top view except sealing resin of the light source unit shown in FIG. FIG. 4 is a cross-sectional view taken along IV-IV in FIG. 3. It is a top view which shows the example of a change of an electrode in the light source unit shown in FIG. It is a top view which shows the example at the time of connecting the light source unit shown in FIG. 1 to a longitudinal direction, and connecting the electrode in series. It is a top view which shows the example at the time of connecting the light source unit shown in FIG. 5 to a longitudinal direction. It is a top view which shows the example at the time of connecting the light source unit shown in FIG. 1 to a longitudinal direction, and connecting the electrode in parallel. It is a top view which shows the example at the time of connecting the light source unit shown in FIG. 5 in the width direction, and connecting the electrode in parallel. It is a top view which shows the example at the time of connecting the light source unit shown in FIG. 1 in the width direction, and connecting the electrode in series.

  The light source unit 1 shown in FIGS. 1 to 4 includes a base 2 and a substrate 3. The base 2 is made of a metal or alloy having a high thermal conductivity and excellent heat dissipation, and has a substantially rectangular parallelepiped shape such as an elongated plate shape. Further, in the center of the base 2 in the present embodiment, an elongated rectangular mounting region 2a extending in the longitudinal direction is set.

  On the other hand, the substrate 3 is a film or thin plate made of insulating alumina, resin or the like, has a thin and long through-hole 3a that fits the mounting region 2a of the base 2, and excludes the mounting region 2a. 2 is disposed on the upper surface. A pair of wiring patterns 4 and 5 are provided on the edge of the through hole 3a on the substrate 3 along the longitudinal direction of the mounting region 2a. The wiring patterns 4 and 5 are opposed to each other so as to sandwich the mounting area 2a. Further, the wiring patterns 4 and 5 in the present embodiment are provided with connection electrodes 4a, 4b, 5a and 5b at both ends in the longitudinal direction, respectively.

  A plurality of LED elements 6 are mounted in the mounting area 2 a of the base 2. In the present embodiment, four LED elements 6 are connected in series so as to be bridged between the wiring patterns 4 and 5 to form an LED element array 6L, and the LED element arrays 6L are arranged close to each other. Thus, the LED element block 6B is formed by connecting in series. In addition, a plurality of LED element blocks 6B in the present embodiment are mounted in the mounting region 2a with a predetermined interval for each block, and in this embodiment, 10 blocks are provided in the longitudinal direction at equal intervals. It has been. When the LED element blocks 6B are arranged at a predetermined interval in this way, the light emitting area is reduced for each block. Not only can the size be reduced by reducing the light emitting area, but also variation in the thickness of the sealing resin covering the light emitting area and the phosphor mixed therein can be prevented, and chromaticity defects can be reduced. Can do. In the present embodiment, 10 LED element blocks 6B are mounted at regular intervals, but the size of the intervals can be adjusted by increasing or decreasing the number of LED element blocks 6B even in the same mounting area. The intervals between the blocks are not necessarily equal.

  In this embodiment, the eight LED elements 6 forming one LED element block 6B are connected by wires 7 so as to be in series with each other. The LED elements 6 at both terminal portions in the LED element block 6B connected in series are connected to the wiring patterns 4 and 5 by wires 8 respectively.

  A resin frame 9 is formed on the upper surface of the wiring patterns 4 and 5 and the substrate 3 at the edge of the through hole 3a so as to surround the mounting region 2a. The resin frame 9 is formed with a height sufficiently higher than the wires 7 and 8 on the LED element 6.

  The sealing resin 10 is made of epoxy resin, silicon resin, or the like, and seals the LED element 6 and the wires 7 and 8 by being filled in the resin frame 9 and cured. The sealing resin 10 may be mixed with a phosphor as necessary.

  In the light source unit 1 having the above configuration, the LED elements 6B connected to the wiring patterns 4 and 5 emit light by connecting the electrodes 4a (or 4b) and 5a (or 5b) to a power source.

  The LED elements 6 in the light source unit 1 are arranged close to each other in each block and are mounted in a row so as to be bridged between the wiring patterns 4 and 5. The distance and the distance between the LED element 6 at the terminal portion and the wiring patterns 4 and 5 are extremely narrow. For this reason, the wire 7 that connects the LED elements 6 and the wire 8 that connects the LED elements 6 and the wiring patterns 4 and 5 become very short. As a result, even if stress due to filling or curing of the sealing resin 9 acts on the wires 7 and 8, it is difficult to be disconnected.

  Further, by connecting a large number of LED elements 6 in series as in the LED element block 6B, variations in luminous intensity due to variations in Vf of the LED elements 6 can be suppressed.

  The LED element rows 6L in this embodiment are close to each other by two rows to form one LED element block 6B, but this can be increased or decreased to one row or three rows. It is also possible to increase or decrease the number of LED elements 6 forming each LED element array 6L.

  In this embodiment, the electrodes 4a, 4b, 5a and 5b are provided at both terminals of the wiring patterns 4 and 5, respectively. However, as shown in FIG. Relatively large horizontally long rectangular electrodes 4c and 5c may be provided. Further, as shown in FIGS. 6 to 10, even when a plurality of light source units 1 are connected, the electrodes 4a, 4b, 5a, 5b or the electrodes 4c, 5c are connected in series or in parallel, so Connection becomes easy.

  For example, as shown in FIG. 6, a plurality of light source units 1 are connected in the longitudinal direction, and adjacent electrodes 4a and 5b are connected to each other so that the light source units 1 can be connected in series. As shown in FIG. 5, the light source units 1 can be connected in series by connecting a plurality of light source units 1 in the longitudinal direction and connecting the adjacent electrodes 4c and 5c. On the other hand, as shown in FIG. 8, even when a plurality of light source units 1 are connected in the longitudinal direction, the adjacent electrode 4a and the electrode 4b are connected, and the electrode 5a and the electrode 5b are connected to each other. Parallel connection between each other is possible.

  Furthermore, the light source unit 1 of the present invention can also connect a plurality of light source units 1 in the width direction as shown in FIGS. 9 and 10, and in this case as well, they are adjacent as shown in FIG. By connecting the electrodes 4c and 5c to each other, the light source units 1 can be connected in parallel. On the other hand, as shown in FIG. 10, the electrodes 4a and 5a of the adjacent light source units 1 are connected. The light source units 1 can be connected in series.

  As described above, in any case, it is easy to connect the plurality of light source units 1 both in the longitudinal direction and in the width direction, and the series connection and the parallel connection between the electrodes do not cross the connection line 11. Wiring can be done easily without difficulty. Each light source unit 1 is fixed to a lighting device or the like by fitting a fixing screw 13 into a recess 12 provided at an end of the base 2 and the substrate 3.

DESCRIPTION OF SYMBOLS 1 Light source unit 2 Base 2a Mounting area 3 Substrate 3a Through-hole 4,5 Wiring pattern 4a, 4b, 4c, 5a, 5b, 5c Electrode 6 LED element 6B LED element block 6L LED element row 7, 8 Wire 9 Resin frame 10 Sealing resin 11 Connection line 12 Recess 13 Fixing screw

Claims (5)

A base with a mounting area on the top surface;
A substrate on which the wiring pattern is formed along the mounting region, disposed on the upper surface of the base excluding the mounting region;
A plurality of light emitting diode elements connected in series to form a block, and mounted in the mounting region at intervals for each block, a plurality of light emitting diode element blocks connected to the wiring pattern for each block;
A light-transmitting sealing resin for sealing the light-emitting diode element block;
A light source unit comprising: The wiring patterns are arranged to face each other across the mounting area,
2. The light source unit according to claim 1, wherein the light emitting diode element block is formed by a light emitting diode element array in which a plurality of light emitting diode elements bridged between the wiring patterns are mounted in alignment. 3. The light source unit according to claim 2, wherein a plurality of the light emitting diode element rows are provided and are arranged close to each other to form one of the light emitting diode element blocks. The light source unit according to claim 1, wherein the light emitting diode element blocks are arranged at equal intervals. The light source unit according to claim 2, wherein an electrode is provided on at least one end of the wiring pattern opposite to the opposite end.

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