JP2005353814A - Led lamp for large power - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform such a process that, when a board is formed to be convenient from the viewpoint of an electric supply to an LED chip by providing a mount part and a power supply part, as an insulating state is demanded for integration of the board, the integration can automatically be done simultaneously when a case is molded by resin molding, thereby enabling the process to be simplified and a cost to be reduced. <P>SOLUTION: Boards 2 are formed in a mount 2a and a power supply 2b to be in a predetermined shape in a state of having an appropriate gap therebetween. When a case 3 is molded, a resin to form this case is injected into the gap to be closed. Also, the mount 2a is adhered to the power supply 2b to obtain a structure of being integrated as a board 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an LED lamp that can be used as a display lamp or the like by assembling a case to an LED chip, and more specifically, for use in applications requiring a light amount, such as a light source of a vehicular lamp. Since a large current is applied to the LED chip and the LED chip generates a large amount of heat, the present invention relates to an LED lamp having a structure in which the substrate portion is made of a metal having excellent thermal conductivity and the size is increased to improve the cooling efficiency.

In the conventional LED element, in order to metallize the core (substrate) with excellent thermal conductivity, a pair of cores formed of copper are bonded to each other with a first insulating layer to electrically connect the positive electrode side and the negative electrode side. In addition, there is a substrate in which a wiring pattern layer is formed on the upper surface of each of the positive electrode side and the negative electrode side, and an LED chip is mounted on the wiring pattern layer or attached by a bump. .
JP 2003-3092292 A

  In the LED lamp having the above-described conventional configuration, the heat dissipation efficiency for the LED chip is surely improved. For example, the LED chip is die-mounted on the pad formed on the copper foil of the printed board. As compared with, the temperature rise of the LED chip at the same current value can be reduced, so that a larger current can be applied within the allowable temperature range, and the amount of light can be increased.

  However, in the conventional configuration described above, a substrate is manufactured by bonding a pair of copper cores with a first insulating layer, and further, a wiring pattern layer for positive and negative electrodes is formed on the upper surface via a second insulating layer. In addition, there are many manufacturing processes such as through holes penetrating the second insulating layer to electrically connect the copper core and the wiring pattern layer, and for example, a light source for a vehicle lamp However, it is difficult to adapt to applications that are required to be supplied to the market in large quantities and at low cost, such as traffic light sources.

  In addition, the configuration of the above-described conventional example is a configuration suitable for use in a device that is generally used indoors. For example, the LED chip is mainly intended for a moisture-proof function such as potting resin. For example, a lens having a shape having a desired optical characteristic such as a lens shape or a prism shape is extremely difficult, and is used for a light source of a vehicle lamp in which light distribution characteristics are important. However, there was a problem with optical characteristics.

  As a concrete means for solving the above-described conventional problems, the present invention provides a mount part and a power distribution part made of a metal having an area and a thickness almost sufficient to dissipate heat generated by an electric current applied to the element. And a case portion formed by casting molding of a resin member that surrounds the LED chip on the substrate portion and has an appropriate height. The LED chip mounted on the mounting part of the substrate part and wired with the power distribution part, and for protection to be injected into the case part in an appropriate amount to protect the wiring and the LED chip as necessary The gap between the mount part and the power distribution part of the substrate part is formed by the resin forming the case part when the case part is molded. By providing a high-power LED lamp characterized by being sealed and bonded and integrated as a substrate part, the manufacturing process can be simplified and the lens is also provided. In addition, it is possible to mount an LED lamp having a desired optical characteristic, and also to improve moisture resistance, and to solve the problem as an LED lamp suitable for a light source mainly used for vehicle lamps and signal lamps used outdoors.

  According to the present invention, it is preferable to provide a mount unit and a power distribution unit to form a substrate that is required to be in an insulated state when forming a substrate that is convenient in terms of power supply to the LED chip. The process can be simplified and the cost can be reduced as it can be automatically integrated at the same time when the case is molded.

  In addition, since the case is provided, it is possible to inject a protective resin having excellent moisture resistance such as silicon into the case, and the moisture resistance is improved so that it can be used outdoors and attached to the case. A degree of freedom is also given to the shape of the lens, a desired light distribution characteristic is easily obtained, and convenience when used as a light source such as a vehicular lamp is improved.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 and 2 is a first embodiment of a high power LED lamp according to the present invention. In this high power LED lamp 1, first, for example, thermal conductivity such as copper and aluminum is used. The mount part 2a and the power distribution part 2b are formed using a metal having excellent electrical conductivity, and the board part 2 is configured by combining the mount part 2a and the power distribution part 2b.

  The mount part 2a and the power distribution part 2b are formed for the purpose of efficiently dissipating heat generated by lighting the LED chip 4 described later. It is preferable to set the size and thickness as much as possible. In order to supply power to the LED chip 4, the mount part 2a and the power distribution part 2b are connected to the positive electrode of the power source on one side and connected to the negative electrode on the other side. Since the polarity of the die-mounted side differs depending on the type of the LED chip 4 to be mounted, it cannot be specified which side the positive electrode is connected to.

  Therefore, each of the mount portion 2a and the power distribution portion 2b is provided with a terminal-like tab 2c for facilitating wiring. By changing the shape of the tab 2c, etc. You may make it distinguishable from what a positive electrode is connected to the mount part 2a side, and what has a positive electrode connected to the said power distribution part 2b side. Moreover, you may change the shape of the board | substrate part 2 so that it may demonstrate later.

  And the case part 3 is shape | molded by injection molding etc. of insulating resin as shown in FIG. 2 with respect to the said mount part 2a and the power distribution part 2b. At this time, the mount part 2a and the power distribution part 2b are set in a mold before resin injection at a predetermined interval as shown in FIG. 3, and so-called insert molding is performed. As described above, the mount portion 2a and the power distribution portion 2b are provided with tabs 2c so as to be convenient for supplying power to the mount portion 2a and the power distribution portion 2b.

  Further, in the present invention, prior to setting the mount portion 2a and the power distribution portion 2b in the mold, at least a portion that comes into contact with the case portion 3 is subjected to a surface roughening treatment with a chemical. The surface area is increased by using a very fine uneven surface or a matte surface, the contact area with the resin forming the case portion 3 is increased, and the bonding strength is increased. In addition, as resin which forms the case part 3, what has high heat resistance is preferable, for example, PPS (polyphenylene sulfide) resin etc. are mentioned.

  Here, when the flow of the resin in the molds 20 and 21 when forming the case portion 3 is considered with reference to FIGS. 1 and 3, the resin is in close contact with the upper surfaces of the mount portion 2 a and the power distribution portion 2 b. A cavity portion forming a housing portion 3a formed in a substantially cylindrical shape, and a cavity portion forming a connecting portion 3b, which is a gap in which the plate thickness surfaces of the mount portion 2a and the power distribution portion 2b face each other at an appropriate interval, Are partially connected, the resin forming the housing portion 3a also flows into the connecting portion 3 to form a connecting portion 3b that connects the mount portion 2a and the power distribution portion 2b with a plate thickness portion.

  In the present invention, the mount portion 2a and the power distribution portion 2b, which are in contact with the resin forming the connecting portion 3b, are also treated with a chemical treatment or the like on the plate thickness surface of the power distribution portion 2b. And the resin are strongly bonded to each other, and the mounting strength between the mount portion 2a and the power distribution portion 2b performed by the housing portion 3a is also added, so that the mount portion 2a and the power distribution portion 2b, that is, the substrate portion 2 and the case portion 3 are added. The strength of the bonding to the LED chip 4 is sufficient to protect the LED chip 4.

  In the present invention, when the mount portion 2a and the power distribution portion 2b are so-called pear ground, by using a chemical such as an acid solution, compared to when the surface area is increased by a mechanical method such as sandblasting, It has an irregular shape with undercuts, etc., and the rate of increase in the bonding area is high, and the resin flows into the undercut, so the case part 3 is bonded with high strength. It has become. At the same time, since the PPS resin used for forming the case part 3 is excellent in fluidity at the time of molding, it has good adhesion to irregular irregularities such as flowing into the above undercut, and this also increases the bonding strength. It becomes.

  The mount part 2a and the power distribution part 2b formed as described above have the LED chip 4 on one side of the mount part 2a at a position within the case part 3 as shown in FIG. Thereafter, the power distribution unit 2b and the other pole of the LED chip 4 are wire-bonded with a gold wire 5 or the like. Subsequently, if necessary, coating is performed by dropping a transparent filler 6 such as silicon resin in order to protect the LED chip 4 and the gold wire 5.

  In recent years, blue light emitting LED chips 4 have been adopted, and phosphors 6 a that emit yellow light when mixed with the light emitted from the LED chips 4 are mixed in the filler 6, thereby synthesizing light emission. Since the white light emitting color has been adopted as a light source for a bicycle headlamp or a flashlight, the filler 6 may be added with a phosphor 6a. It is.

  Then, as a subsequent process, the lens 7 is attached to the upper surface of the housing portion 3a (see FIG. 2), and the high power LED lamp 1 of the present invention is obtained. Therefore, according to the present invention, since the lens 7 is attached in the final process, it can be attached to the housing portion 3a by an appropriate means such as adhesion or screwing, for example, a so-called single lens shape such as a convex lens shape or a concave lens shape. In addition to the above, it is possible to attach a composite shape such as a fish-eye lens shape or a prism cut shape. Therefore, according to the configuration of the high power LED lamp 1 of the present invention, LED lamps (light sources) having various light emission shapes such as a spot shape and a diffused light shape can be obtained.

  In actual production, the mount portion 2a and the power distribution portion 2b are formed in a shape in which a plurality of appropriate portions are connected as shown in FIG. If cutting is performed individually after molding, the number of production per cycle (one shot) of the molding machine increases, and the cost can be reduced.

  Here, the mount part 2a and the power distribution part 2b will be described again. Since the main purpose is heat dissipation by conduction of heat generated in the LED chip 4 to the outside, for example, heat dissipation can be performed more efficiently than the vehicle body of the vehicle. It is possible to reduce the size when it is in contact with a portion that can be expected, and it is also possible to reduce the size when it can be positioned where it is well ventilated and the air cooling effect can be expected. In consideration of the above, it is preferable to set the arrangement and shape of the mount portion 2a and the power distribution portion 2b.

  5 to 7 show examples of use of the high power LED lamp 1 according to the present invention, and FIG. 5 uses the tab 2c portion and wiring is normally performed at the time of attachment to a printed circuit board. It is attached to a portion of the pad 10 formed as an area larger than the portion by means such as soldering. FIG. 6 and FIG. 7 show a wiring method performed in a place where a large number of lamps are provided close to each other, such as wiring of an instrument panel, for example, by pressing a metal plate, as if it is a printed circuit board. A circuit part 11 is formed by punching into a shape similar to a wiring circuit as formed by etching, and the circuit part 11 is fixed to a housing formed of resin by heat caulking or the like to form a power distribution panel 12. ing.

  In this case, as shown in FIG. 6, the tab 2c may be used to attach the rivet 13 or the like, or a member having an appropriate spring property may be used on the circuit part 11 side as shown in FIG. For example, an H-shaped slit 11a having a narrower gap than the tab 2c is provided, and the tab 2c is also bent into, for example, an L-shape so as to be suitable for insertion, and the tab 2c is press-fitted into the slit 11a. By doing so, it is good also as what is attached with the means similar to what is performed with what is called a speed nut etc. which are made to clamp and attach with the spring property of the slit 11a.

  In any case, as described above, in the LED lamp 1, it is uncertain which of the mount portion 2a and the power distribution portion 2b becomes the positive electrode, and therefore, for example, the shape of the tab 2c is changed. Alternatively, it is preferable to be able to make a clear distinction such that one is riveted and the other is inserted. Alternatively, as shown in FIG. 2, the boss 3 c is projected at a predetermined position on the back surface of the substrate portion 2 by using the molding of the case portion 3 and corresponds to the side on which the LED lamp 1 is mounted such as a vehicle body. A recess may be provided at the position, and if the polarities do not match, the positions of the boss 3c and the recess may not match, and the mounting may be impossible. In any case, in the high power LED lamp 1 of the present invention, measures are taken so that the polarity is not reversely connected. When the boss 3c is unnecessary, the connecting portion 3c does not protrude from the back surface of the substrate portion 2 and is substantially flush.

  FIG. 8 shows a second embodiment of the high-power LED lamp 1 according to the present invention in a principal part, and as described above, the LED chip 4 has a positive and negative electrode on the die bond side. Therefore, the polarity when power is supplied to the tab 2c is reversed. Therefore, in this second embodiment, the outer diameter of the power distribution unit 2b of the previous first embodiment is a square shape in total with the mount unit 2a (see FIG. 1). Then, the external shape of the first embodiment is changed from the square-shaped power distribution unit 2b to the circular power distribution unit 2d, and the shape is clearly different from that of the first embodiment, and the polarity is different. Something is clearly recognizable to the user.

  FIG. 9 shows a third embodiment of the high power LED lamp 1 according to the present invention in a main part. In the first embodiment and the second embodiment described above, it is desired to further supply high power. The mount part 2a and the power distribution part 2b are larger and formed in a circular shape or the like, and if necessary, radial cuts are provided in an appropriate range from the outer diameter. ing.

  Then, after the LED chip 4 is attached, the gold wire 5 is wired, and the lens 7 is attached, the LED chip 4 is bent in an appropriate direction to function as the heat sink portion 2e. By doing so, air convection or ascending airflow is generated in the heat sink portion 2e, and cooling is performed efficiently, the applied current can be increased, and a brighter LED lamp for high power 1 is obtained.

  10 to 12 are examples of another embodiment of the high power LED lamp 1 according to the present invention. The fourth embodiment shown in FIG. 10 includes, for example, a red light emitting LED chip 4R, In this example, the three primary colors of the green light emitting LED chip 4G and the blue light emitting LED chip 4B are individually wired so as to be blinkable so that they can be mixed with a single color, for example, to constitute one pixel of a full color display. In addition, each following embodiment including the said 4th embodiment is shown with the structure of a board | substrate and the state of arrangement | positioning of an LED chip in order to make an understanding easy.

  In the fifth embodiment shown in FIG. 11, the two LED chips 4 are wired so as to be able to blink individually at a distance. For example, when the vehicle makes a left turn, the right LED 4R is turned on and the left LED 4R is turned on. This is an example of forming a light source for a cornering lamp that irradiates a direction. Therefore, the board | substrate 2 is divided into 3 by the connection part 3b. In addition, the sixth embodiment shown in FIG. 12 is a configuration used when two LED chips 4 are lit in series. Also in this case, the substrate 2 is divided into three by the connecting portion 3b. Are connected in series.

  As described above, the substrate 2 is integrated with the mount portion 2b and the power distribution portion 2b using the molding of the case portion 3 according to the present invention. Thus, the substrate 2 having a large area can be obtained without performing the above process, and the production process of this type of high power LED lamp 1 can be greatly simplified and the cost can be reduced.

It is a top view which shows 1st embodiment of the LED lamp for high power which concerns on this invention. It is sectional drawing which follows the AA line of FIG. It is explanatory drawing which shows schematically the formation process of the board | substrate of the LED lamp for high power which concerns on this invention. It is explanatory drawing which shows the state of a board | substrate when it takes multiple pieces. It is explanatory drawing which shows the attachment state by the solder to the vehicular lamp etc. of the high power LED lamp which concerns on this invention. It is explanatory drawing which shows the attachment state by the rivet similarly to the vehicular lamp etc. of the high power LED lamp which concerns on this invention. It is explanatory drawing which shows the attachment state by the insertion to the vehicle lamp etc. of the high power LED lamp which concerns on this invention similarly. It is a top view which shows 2nd embodiment of the LED lamp for high power which concerns on this invention in the principal part. It is a side view which shows 3rd embodiment of the high power LED lamp which concerns on this invention by the principal part. It is a top view which shows 4th Embodiment of the high power LED lamp which concerns on this invention by the principal part. Similarly, it is a top view which shows 5th Embodiment of the LED lamp for high power which concerns on this invention by the principal part. Similarly, it is a top view which shows 6th embodiment of the LED lamp for high power which concerns on this invention by the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High power LED lamp 2 ... Board | substrate part 2a ... Mount part 2b, 2d ... Power distribution part 2c ... Tab 2e ... Heat sink part 3 ... Case part 3a ... Housing part 3b ... Connection part 3c ... Boss 4 ... LED chip 5 ... Gold Wire 6 ... Filler 6a ... Phosphor 7 ... Lens 10 ... Pad 11 ... Circuit part 11a ... Slit 12 ... Distribution panel 20, 21 ... Mold

Claims (3)

  A substrate portion having a mounting portion and a power distribution portion formed of a metal having an area and thickness substantially sufficient to dissipate heat generated by an electric current applied to the element, and having a suitable gap and a predetermined shape; A case part formed by casting molding of a resin member surrounding the LED chip on the board part and having an appropriate height, and mounted on a mount part of the board part, and wiring is performed with the power distribution part The substrate portion includes an LED chip, a protective resin that is injected into the case portion in an appropriate amount to protect the wiring and the LED chip as necessary, and a lens that covers and covers the housing. The gap between the mount portion and the power distribution portion is sealed when the case portion is molded, and the resin forming the case is injected and sealed, and the substrate portion is integrated. High power LED lamps, characterized in that there.   2. The high power LED according to claim 1, wherein the case portion is provided with a positioning boss portion that protrudes to the back surface using the gap or a hole provided in the substrate portion. lamp.   3. The high power according to claim 1, wherein a heat sink portion is formed on the substrate portion by bending or drawing at a position having a diameter larger than the outer diameter of the case portion. LED lamp.

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