JP4756682B2 - Light emitting diode light source unit and bulb type light emitting diode light source - Google Patents

Description

  The present invention relates to a light emitting diode light source used as various illumination light sources, and more particularly to a light emitting diode light source unit and a bulb type light emitting diode light source.

A light-emitting diode (hereinafter abbreviated as LED) using a compound semiconductor has advantages such as a small amount of heat generation and a long life compared with a conventional illumination light source such as an incandescent light bulb. The application field as a light source is expanding. Since a single LED element has insufficient light quantity, it is necessary to form a light source in which a plurality of LED elements are assembled for practical use as a light source for general illumination, and various types of bulb-type LED light sources have been proposed. (For example, refer to Patent Document 1 and Patent Document 2.)
Japanese Patent Laying-Open No. 2004-39594 (FIG. 1, paragraph numbers 0010-0014) JP 2004-296245 A (FIG. 1, paragraph numbers 0014-0020)

  However, in such a bulb-type LED light source, if the LED drive current is increased in order to obtain a light source that requires high brightness and high output, the power loss in the LED increases in proportion to this, and most of the energy Is converted into heat, and the temperature of the LED rises to a high temperature. As the temperature increases, the light emission efficiency (current-light conversion efficiency) decreases as the characteristics of the LED, so that the luminance decreases, and the LED operating life becomes shorter as the temperature increases. Therefore, how to efficiently dissipate heat from the LED element is a problem. In the conventional bulb-type LED light source, the LED element is directly mounted on a cylindrical or planar mounting board, and heat is radiated through the mounting board having low thermal conductivity, so that sufficient heat dissipation characteristics cannot be obtained. .

  The present invention has been made to solve such a conventional problem, and an object thereof is to provide an LED light source unit and a bulb-type LED light source having sufficient heat dissipation characteristics.

Means of the present invention for solving the above problems is a columnar base having a cross-section of substantially inverted trapezoidal shape made of copper alloy, each side of the adjacent side surfaces of the base when allowed to adjacent a base having at least a portion to contact with each other surfaces of a plurality of light emitting diode elements mounted on the top surface of the base, through holes of the elongate hole shape is formed at the center which is disposed on the upper surface of the base was composed of a printed circuit board having a wiring pattern on the printed board, the wiring pattern through a plurality of connecting electrode portions provided at regular intervals, the wiring pattern and the electrodes of the light emitting diode element A plurality of electrically connected terminal electrodes, and a metal from each electrode of the plurality of light emitting diode elements mounted on the upper surface of the base exposed in the through hole at substantially equal intervals to the connection electrode portion Electrode consisting of fine wires Are connected by wires as connection members, characterized in that the upper the of the base exposed from the top and the through hole of the printed circuit board except for the terminal electrode portions sealed with a translucent resin.

  In addition, an engaging portion that engages with each other is provided on each of both side surfaces of the base.

  A plurality of the light emitting diode elements connected in series are connected in parallel between two terminal electrodes.

Another aspect of the present invention for solving the above problems, to bind the surface together to contact each other of the plurality of the base side of the light-emitting diode light source unit according to any of claims 1 to 3 It is characterized by being formed by combining in a substantially cylindrical shape.

  The light emitting diode light source unit further includes a mediating member that can take out a plurality of terminal electrodes in two.

  The light emitting diode light source unit is characterized in that three light emitting diode elements connected in series are connected in parallel between two terminal electrodes.

  As described above, according to the present invention, each of the long bases having a substantially trapezoidal cross section made of a metal having high thermal conductivity and adjacent to each other when the side surfaces of the bases are adjacent to each other. A printed circuit board comprising: a base having a surface that is in close contact with at least a part of a side surface of the substrate; a plurality of light emitting diode elements mounted on an upper surface of the base; and a printed circuit board disposed on the upper surface of the base. Has two terminal electrodes electrically connected to each electrode of the light emitting diode element through a wiring pattern, and the upper surface of the base except the terminal electrode portion is sealed with a translucent resin. The LED light source unit which has the outstanding heat dissipation as a basic component in the case of comprising various LED light sources can be provided. In addition, since a plurality of such LED light source units are formed in a substantially cylindrical shape by directly joining the side surfaces of the bases that are in close contact with each other, a bulb-type LED light source can be easily formed at low cost. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the bulb-type LED light source according to the first embodiment of the present invention will be described. 1 is a side view of a bulb-type LED light source according to a first embodiment of the present invention, FIG. 2 is a view showing an end face on the terminal electrode side of FIG. 1, and FIG. 3 is a side view showing the LED light source unit of FIG. It is. FIG. 4 is a plan view showing the LED light source unit excluding the sealing resin. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 7 is a side view showing a bulb-type LED light source coupled with a socket in the first embodiment of the present invention. FIG. 8 is a circuit diagram showing a wiring circuit of a bulb type LED light source. 9 is a front view of the socket of FIG. 7, and FIG. 10 is a cross-sectional view showing a BB cross section of FIG.

  In FIG. 1, reference numeral 10 denotes a bulb type LED light source. Reference numeral 1 denotes an LED light source unit as a basic component constituting the bulb-type LED light source 10, and the bulb-type LED light source 10 is a side surface of a later-described base of a plurality (here, six) of LED light source units 1. The surfaces that are in close contact with each other are directly combined to form a substantially cylindrical shape. The details of the LED light source unit 1 will be described with reference to FIGS. Reference numeral 2 denotes a long base having a substantially trapezoidal cross section made of a copper alloy having excellent thermal conductivity. When the side surfaces of the base 2 are adjacent to each other, at least one of the adjacent side surfaces is shown. It has the surface which mutually adheres to a part.

  Reference numeral 3 denotes a single printed circuit board of single-sided wiring made of glass epoxy or the like bonded on the base 2. The printed board 3 is formed with a through-hole 3a as a long-hole-shaped through-hole at the center, and wiring patterns 3b, 3c and 3d are formed along the through-hole 3a on the upper surface. A plurality of connection electrode portions are provided at equal intervals in each of the wiring patterns 3b, 3c, and 3d. A cathode terminal electrode 3e and an anode terminal electrode 3f are provided at the end of the printed circuit board 3, and are connected to the wiring patterns 3b and 3c, respectively. The printed circuit board 3 is not a single sheet, but is composed of two sheets: one printed circuit board including one wiring pattern 3b and 3d and another printed circuit board including the other wiring pattern 3c and 3d. Also good.

  Reference numeral 4 denotes an LED element as a light emitting element, and a plurality (24 in this case) are mounted at substantially equal intervals on the upper surface of the base 2 exposed in the through-hole 3a via silver paste. In addition, arbitrary plural LED elements 4 may be mounted in arbitrary plural rows. Reference numerals 5 and 6 denote wires as electrode connection members made of fine metal wires, and the electrodes of each LED element 4 are connected to the connection electrode portions of the wiring patterns 3b, 3c and 3d of the printed circuit board 3. Reference numeral 7 denotes a sealing resin made of a translucent resin, which covers the printed circuit board 3 except for the cathode terminal electrode 3e and the anode terminal electrode 3f in a rectangular parallelepiped shape to protect the LED element 4 and the wires 5 and 6. is doing. Reference numeral 8 denotes an end portion of the LED light source unit 1, which shows a terminal portion that is not resin-sealed and is provided with the cathode terminal electrode 3 e and the anode terminal electrode 3 f.

  In FIG. 7, reference numeral 20 designates a plurality of cathode terminal electrodes 3e and anode terminal electrodes 3f as two terminals by being detachably fitted to a plurality of terminal portions 8 of a bulb-type light source 10 in which a plurality of LED light source units 1 are assembled. A socket as a mediating member to be taken out together is shown. In FIG. 10, reference numeral 21 denotes a main body of a socket 20 made of a cylindrical resin material, and a concave portion 21a into which a plurality of terminal portions 8 of the bulb-type light source 10 can be inserted is formed at the center. A pair of strip-like terminal electrodes 22 and 23 are formed in the recess 21a at a predetermined interval along the inner periphery. When the plurality of terminal portions 8 of the bulb-type light source 10 are inserted, each cathode terminal electrode 3e and anode terminal electrode 3f are electrically connected to the pair of band-shaped terminal electrodes 22 and 23. Yes. Reference numeral 24 denotes a cathode terminal drawn from the terminal electrode 22, and reference numeral 25 denotes an anode terminal similarly drawn from the terminal electrode 23.

  As shown in FIG. 8, in the LED light source 10 unit 1, a plurality of sets (here, 8 sets) in which three LED elements 4 are connected in series are connected in parallel between two terminal electrodes. If a bulb-type LED light source 10 is configured by combining a plurality of (in this case, six) LED light source 10 units 1, a 12V DC power source is connected between the two terminal electrodes 24 and 25 and can be applied to, for example, an automotive power source LED light source.

  Next, functions and effects of the bulb type LED light source according to the first embodiment of the present invention will be described. When the LED elements 4 are driven by applying a drive voltage of 12 V to the cathode terminal 24 and the anode terminal 25 of the socket 20, each LED element 4 emits light, and the light is transmitted through the sealing resin 7 and emitted. The part becomes heat and is emitted from the LED element 4. Since the lower surface of the LED element 4 is in close contact with the base 2 having good thermal conductivity, heat is efficiently dissipated. Moreover, since the bulb-type LED light source 10 can be configured by combining the bases 2 of the LED light source unit 1, an LED light source with excellent heat dissipation can be easily manufactured.

  Next, a bulb type LED light source formed using the LED light source unit according to the second embodiment of the present invention will be described. FIG. 6 is a diagram showing an end face of the bulb-type LED light source according to the second embodiment of the present invention on the terminal side. In FIG. 6, reference numeral 20 denotes a bulb type LED light source. Reference numeral 11 denotes an LED light source unit constituting a bulb type LED light source. On one side surface of the base 2, a ridge portion 2a is formed over the longitudinal direction, and on the other side surface, a groove portion 2b that fits the ridge portion 2a is formed. Such protrusions 2a and grooves 2b are not necessarily formed over the entire length of the base 2. That is, it is only necessary to provide engaging portions that engage with each other on both side surfaces of the base 2. Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and names, and detailed description thereof is omitted.

  Next, the effect of the bulb type LED light source according to the second embodiment of the present invention will be described. The bulb-type LED light source 20 does not require a mediating member or an adhesive to join the bases 2 of the LED light source unit 11 together. Therefore, the assembly cost of the LED light source can be reduced. Other effects are the same as those of the first embodiment.

  As described above, the bulb-type LED light sources 10 and 20 according to the embodiment of the present invention can be easily formed by combining a plurality of LED light source units 1 and 11 as assembly unit units. Moreover, since the LED light source units 1 and 11 can be mass-produced as an assembly unit, it can contribute to the reduction of the manufacturing cost of the bulb-type LED light sources 10 and 20.

  In the bulb-type LED light sources 10 and 20 described above, the bulb-type LED light source is configured by using six LED light source units 1 or 11, but the number to be connected is not limited to six, but three It may be 10 or so.

  Since the LED light source unit of the present invention can be used as a basic unit of assembly, it can be applied as a single unit as an LED light source such as a camera flash or the like. It can be easily manufactured when constructing a suitable LED light source.

It is a side view showing a bulb type LED light source which is a 1st embodiment of the present invention. It is a figure which shows the end surface by the side of the terminal electrode of FIG. It is a side view which shows the LED light source unit of FIG. It is a top view which shows the place except sealing resin of the LED light source unit. It is sectional drawing which shows the AA cross section of FIG. It is a figure which shows the end surface by the side of the terminal electrode of the bulb-type LED light source which is the 2nd Embodiment of this invention. It is a side view which shows the bulb | ball type LED light source which combined the socket in the 1st Embodiment of this invention. It is a circuit diagram which shows the wiring circuit of the valve | bulb type LED light source which is embodiment of this invention. It is a front view of the socket shown in FIG. It is sectional drawing which shows the BB cross section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11 LED light source unit 2 Base 2a Projection part 2b Groove part 3 Printed circuit board 3a Through long hole 3b, 3c, 3c Wiring pattern 3e Cathode terminal electrode 3f Anode terminal electrode 4 LED element 5, 6 Wire 7 Translucent resin 10 , 20 bulb type LED light source 20 socket

Claims (6)

A columnar base having a cross-section of substantially inverted trapezoidal shape made of a copper alloy, a base having at least a portion to contact with each other face of each side of the adjacent side surfaces of the base when allowed to adjacent When a plurality of light emitting diode elements mounted on the top surface of the base, consists of a printed circuit board having a through hole is formed in the base of the center elongated hole shape which is disposed on the upper surface, this printed circuit board wiring It has a pattern, the wiring pattern includes a plurality of connecting electrode portions provided at regular intervals, and two terminal electrodes electrically connected through the wiring pattern and the electrodes of the light emitting diode element In addition, connected to each of the electrodes of the plurality of light emitting diode elements mounted at substantially equal intervals on the upper surface of the base exposed in the through hole by wires as electrode connection members made of fine metal wires, said Emitting diode light source unit, characterized in that sealing the upper the of the base exposed through the through hole and on said printed circuit board except for the child electrode portion of a translucent resin.   The light emitting diode light source unit according to claim 1, wherein engaging portions that engage with each other are provided on both side surfaces of the base.   The light-emitting diode light source unit according to claim 1 or 2, wherein a plurality of sets of three light-emitting diode elements connected in series are connected in parallel between two terminal electrodes. Valve type, characterized in that formed by combining the preceding claims with a plurality of light emitting diodes light source unit according to any one of 3 to bind the surface together to contact each other aspects of the base in a substantially tubular shape Light emitting diode light source.   5. The bulb-type light-emitting diode light source according to claim 4, further comprising an intermediate member capable of taking out a plurality of terminal electrodes of the light-emitting diode light source unit in two. 6. The bulb-type light-emitting diode light source according to claim 5, wherein the light-emitting diode light source unit includes a plurality of sets of three light-emitting diode elements connected in series and connected in parallel between two terminal electrodes.

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