JP5215119B2 - Connection structure of LED power feeding part - Google Patents

Description

  The present invention relates to a joining structure of a power feeding unit for feeding power to an LED mounted on an LED mounting substrate.

  Conventionally, power is supplied to an LED by mounting a coupler, which is a connector component, on an LED mounting board, and electrically connecting the power source and the LED by the coupler. Here, a wiring pattern for supplying power to the LED is formed on the LED mounting board, and a coupler is mounted on the LED mounting board by soldering similarly to electronic components such as a chip resistor and a capacitor. As a method for mounting the coupler on the LED mounting substrate, bonding by screwing, resistance welding, laser welding, or the like is generally employed in addition to soldering.

  By the way, in recent years, the development of a vehicle headlamp as an LED has been promoted, and various proposals regarding a method of supplying power to a high power LED have been made.

  For example, regarding the mounting technology of in-vehicle LEDs, Patent Document 1 proposes to simultaneously supply and fix the LED by sandwiching the LED with a clip-shaped terminal, and Patent Document 2 includes an LED and a heat sink with a power supply attachment. There has been proposed a structure in which these are sandwiched and pressed and fixed with clip-shaped parts.

  Patent Document 3 proposes a configuration in which an LED is fitted into a terminal-equipped component having a leaf spring to perform power feeding and fixing. Patent Document 4 joins a male terminal to the LED, and a female terminal is connected to the male terminal. A configuration has been proposed in which a terminal is inserted to electrically connect an LED and a power source, and the LED is fixed to a heat sink by holding it with a clip-shaped component.

On the other hand, regarding the mounting technology other than the in-vehicle LED, Patent Document 5 proposes a configuration in which the connection terminals are supported in parallel so as to be orthogonal to the opening direction of the engagement of the mouth clip. In a female terminal in which a pair of provided clamping plates clamp a strip-shaped male tab along the thickness direction, even when the male tab vibrates, a large number of contact points are secured to improve contact reliability. There has been proposed a configuration in which a rear side protruding portion and a front side protruding portion provided on opposite surfaces of the plate are in contact with the male tab.
JP 2007-207594 A JP 2007-242267 A JP 2007-200757 A JP 2007-194172 A Japanese Patent Laid-Open No. 2006-300877 JP 2005-209518 A

  The reliability test items for automotive parts such as headlamps include heat shock, and many soldering manufacturers have released many high-reliability products for soldering the coupler to the LED mounting board. There is a problem that cracks occur in the solder joints due to the combination of members and the difference in linear expansion coefficient between the metal substrate and the LED. When cracks occur in the solder joints, there is a possibility that mounting parts such as non-lights and LEDs will drop due to poor power feeding of the headlights.

  Moreover, since the vehicle-mounted component attached to the position close to the engine is exposed to a high temperature environment, metal diffusion due to heat occurs between the mounting component and the solder, and an intermetallic compound is formed. Since this intermetallic compound generally becomes brittle, there is a possibility that the solder joint portion is broken due to vibration or impact of the automobile, bending of the lead wire, etc., and the coupler falls off.

  In the configurations described in Patent Documents 1 to 3, the LED is fixed and fed with a leaf spring-shaped terminal. However, in this fixing method, when the leaf spring resonates due to vibration, feeding to the LED is cut off. Thus, there is a situation where the LED is not lit or the LED is repeatedly turned on and off, and the vehicle lamp such as a headlight using the LED as a light source does not meet the regulations.

  Further, in the configurations described in Patent Documents 1 to 3, the LED is sandwiched between leaf spring terminals, but normally, metal tends to soften in a high temperature environment, so the LED is held at a predetermined pressure in the initial state. Even so, the pressure decreases due to the heat generation of the LED and the increase of the environmental temperature, and there is a possibility that the LED will not be lit due to a contact failure of the leaf spring-like terminal, or the LED itself may fall off.

  In the configuration described in Patent Document 4, the male terminal is joined to the LED by welding or the like, but when the female terminal is inserted into the male terminal, the male terminal joined to the LED may be deformed. . Also, the bonding of the terminal to the LED by welding or the like is not possible because it is small in size and the power supply electrode is small, so that a sufficiently large bonding area cannot be ensured. The terminal may be peeled off.

  In order to solve the above problems, it is necessary to improve the shape of the electrodes. However, since the existing electrodes have the following problems, they cannot be used in the field of mounting on-vehicle LEDs. is there.

  That is, in the configuration proposed in Patent Document 5, the hook clip and the mounting substrate can be stably connected to a force that does not exceed the static frictional force caused by the elastic force of the hook clip. In general, the mouth clip is made on the premise that the person will use it. For this reason, if the mouth clip is applied to the LED mounting field, it will inevitably be assembled by human work, the size of the electrode of the power supply part of the LED mounting substrate is 1 cm or less, and the electrode blade Considering that the size of the unit is in mm, it is difficult to accurately grasp the correct position with human hands, and even if the correct position is accurately grasped, it is difficult to accurately move to that position. It is.

  In addition, since it is difficult to recognize whether or not the unevenness of the mouth clip is correctly meshed, there is a possibility that a defective product will be produced without noticing that it has been mistakenly connected.

  The female terminal described in Patent Document 6 can improve contact reliability by securing a large number of contact points even when the male tab vibrates. When the male terminal vibrates, the female terminal follows it. Therefore, stable electrical connection is realized by moving the flexible female terminal. Thus, the function of the female tab is exhibited for the first time by vibration, but in the field of in-vehicle LEDs, there is a problem that long-time vibration causes metal fatigue.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an LED power supply unit that can reliably perform electrical connection between an electrode connected to a power source and a wiring pattern formed on an LED mounting substrate. It is to provide a joint structure.

  In order to achieve the above object, the invention according to claim 1 is directed to extending a wiring pattern formed on an insulating layer of an LED mounting substrate on which an LED is mounted to an end portion of the LED mounting substrate, In the junction structure of the LED power feeding portion that electrically joins the wiring pattern, an uneven terminal formed by arranging a plurality of substantially right-angled triangular blades in a direction parallel to the short side of one of the electrodes or the wiring pattern. And forming an uneven terminal formed by arranging a plurality of blades having a substantially rectangular cross section on the other side, and electrically connecting the electrode and the wiring pattern by engaging the both uneven terminals. .

The invention described in claim 2 is characterized in that, in the invention described in claim 1, Au plating is applied to the surfaces of the electrode and the wiring pattern.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the electrode is disposed inside a coupler made of a non-conductive heat-resistant resin, and the coupler is mounted on the LED mounting substrate together with the electrode. The electrode and the wiring pattern are electrically joined by press-fitting.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the coupler is fixed to the LED mounting board by screws.

  According to a fifth aspect of the present invention, in the first or second aspect of the invention, the electrode and the wiring are sandwiched between the LED mounting substrate by a fixing member screwed to the LED mounting substrate. The pattern is electrically connected to the pattern.

  According to the present invention, it is possible to hear the contact sound when the uneven terminal on the electrode side and the uneven terminal on the LED mounting substrate (wiring pattern side) are properly meshed, or to feel the contact between the uneven terminals with skin sensation. Therefore, it is not necessary to accurately grasp the position compared to the conventional hook clip, and it is possible to easily recognize whether the connection is correct by contact sound or skin sensation. Compared with this, it is possible to reduce the defective product generation rate due to misassembly.

  In addition, according to the present invention, the cross-sectional shape of the blade of one concavo-convex terminal forms a substantially right triangle, and the cross-sectional shape of the blade of the other concavo-convex terminal forms a substantially rectangular shape. Electrode and wiring pattern with respect to external force in any direction such as force perpendicular to the assembly direction, force opposite to the assembly direction, force perpendicular to the ascending direction, vibration, etc. A reliable electrical connection is maintained.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a perspective view showing a bonding structure of an LED power feeding unit according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the bonding structure of the LED power feeding unit, and FIG. 3 is a bonding structure of the LED power feeding unit. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is an enlarged detail view of a portion B in FIG. 4, and FIG. 6 is a cross-sectional view taken along line CC in FIG.

  The illustrated LED mounting substrate 1 is configured by forming an insulating layer 1B on a Cu layer 1A. A wiring pattern 2 is formed on the insulating layer 1B, and an LED 3 is bonded by a heat conductive adhesive 4. Bonded and mounted. A coupler 5 having a U-shaped cross section (see FIG. 4) is press-fitted into an end portion of the LED mounting substrate 1, and the coupler 5 is a heat-resistant resin that extends horizontally from the left and right sides. Alternatively, the LED mounting substrate 1 is firmly fixed by screws 6 inserted through the metal bracket 5a. The LED 3 is bonded to the wiring pattern 2 by an Au wire (or Al wedge) 7. The wiring pattern 2 extends to the power feeding portion of the coupler 5, and the power feeding portion of the coupler 5 and the wiring pattern 2 from a power source (not shown). Then, power is supplied to the LED 3 through the Au wire (or Al wedge) 7.

  The coupler 5 includes a non-conductive housing 5A and a conductive electrode 8. Here, the electrode 8 is configured by applying Au plating to a Cu alloy such as phosphor bronze or brass, and a plurality of right-angled triangular blades are arranged on the upper and lower surfaces of the electrode 8 in a direction parallel to the short side. The uneven terminal 8a is formed. In addition to the Cu alloy, the electrode 8 may be made of a material that can prevent elastic deterioration at high temperatures by adding other elements. Further, the material of the housing 5A of the coupler 5 is preferably a resin material or ceramic material having no electrical conductivity and high heat resistance. For example, PPS carbonate, Kapton material, alumina, AlN, or the like can be used. The electrode 8 disposed inside the housing 5A of the coupler 5 is integrally formed when the housing 5A is molded with a resin material or a ceramic material, or is fitted into the housing 5A.

  The insulating layer 1B constituting the LED mounting substrate 1 may be made of a thermoplastic resin such as polyetherimide, polyetheretherketone, or polyetherphone, or a thermosetting resin such as epoxy resin or polyimide resin. Yes, and a reinforcing material such as a glass fiber cloth may be interposed as required.

  Further, the Cu layer 1A of the LED mounting substrate 1 is provided with the unevenness 1a corresponding to the uneven terminal 8a formed on the electrode 8 of the coupler 5, and is electrically connected to the electrode 8 which is a power feeding portion of the coupler 5. In order to avoid bonding, insulation processing such as resist and alumite processing is applied.

  The wiring pattern 2 is formed by applying Au plating to a Cu foil, and the thickness is preferably 0.1 mm to 1 mm, and is formed on the insulating layer 1B of the LED mounting substrate 1 by etching or pressing. (For the press processing method, see JP-A-8-222838). Then, an uneven terminal 2a corresponding to the uneven terminal 8a formed on the electrode 8 of the coupler 5 is formed at the end of the wiring pattern 2, and the uneven terminal 2a includes a plurality of blades having a rectangular cross section. Configured. In addition, Cu foil does not need to be embedded in the insulating layer 1B.

  Next, the shape of the concavo-convex terminal 8a formed on the electrode 8 of the coupler 5 and the concavo-convex terminal 2a formed on the wiring pattern 2 will be described.

  As shown in FIG. 5, the concavo-convex terminal 8a formed on the electrode 8 of the coupler 5 has a shape in which the cross section is a combination of a plurality of right triangles in a direction parallel to the short side (left and right direction in FIG. 5). In order to ensure sufficient bonding strength by engaging with the concave / convex terminals 2a on the wiring pattern 2 side, the length of the short side of the right triangle is set to 0.1 mm or more, and the distance between the blades is set to 0.1 mm or more. Desirably, at least two blades are required. Further, the angle of the tip of the blade of the concavo-convex terminal 8a can be set to any value as long as the length of the short side, the distance between the blades, and the number of blades satisfy the above conditions. Therefore, the angle of the blade tip should be set to a value that can ensure the strength required for the blade. Further, the shape of the blade is not limited to a sharp knife edge shape, but may be a shape having a curvature.

  On the other hand, the concavo-convex terminals 2a of the wiring pattern 2 constituting the power supply unit on the LED mounting substrate 1 side are configured by arranging a plurality of rectangular cross sections of the same size at regular intervals, and the number of rectangles is on the coupler 5 side. In order to satisfactorily engage with the blades of the uneven terminal 8a formed on the electrode 8, at least three are required.

  The contact state between the electrode 8 on the coupler 5 side and the wiring pattern 2 on the LED mounting substrate 1 is that the oblique side of the blade of the concavo-convex terminal 8a formed on the electrode 8 on the coupler 5 side as shown in the contact F shown in FIG. As shown by the contact G, the edge of the uneven terminal 8a formed on the coupler 8 side electrode and the unevenness of the wiring pattern 2 are in contact with the corners of the rectangular blade of the uneven terminal 2a of the wiring pattern 2 There are two types of terminal 2a blades in contact with each other.

The combination of the concavo-convex terminal 8a formed on the electrode 8 on the coupler 5 side and the concavo-convex terminal 2a of the wiring pattern 2 on the LED mounting substrate 1 side is likely to be vibration or the like for the following three reasons (1) to (3). Even if an external force is applied from any direction, contact between the concave and convex terminals 2a and 8a is maintained.
(1) When a force perpendicular to the press-fitting direction is applied:
When a force in the direction of the arrow a in FIG. 5 is applied to the coupler 5 and a force in the direction of the arrow a ′ acts on the LED mounting substrate 1, the joint between the two concavo-convex terminals 2 a and 8 a is strengthened at the contact F, The same applies to the other contacts in the positional relationship.
(2) When a force in the direction opposite to the press-fitting direction is applied:
The force in the direction of arrow b in FIG. 5 acts on the coupler 5, and the force in the direction of arrow b ′ (the direction opposite to the press-fitting direction of the coupler 5) acts on the LED mounting substrate 1 as in the case of (1). In addition, the bonding between the two concave and convex terminals 2a and 8a is strengthened. This is because the surface where both the concavo-convex terminals 2a and 8a are in contact with each other is perpendicular to the press-fitting direction of the coupler 5, and therefore the both concavo-convex terminals 2a and 8a are independent of the magnitude of the static friction force generated on both surfaces. Is maintained. This property is due to the fact that the cross-sectional shape of the concavo-convex terminal 8a formed on the electrode 8 on the coupler 5 side is a right-angled triangle, and the cross-sectional shape of the blade is an isosceles triangle like the blade of the cleaver clip. In some cases, such an effect cannot be obtained. This is because the hook clip opens when the force generated at the contact is sufficiently large. In addition, the cross-sectional shape of the blade of the concavo-convex terminal 8a of the electrode 8 is not limited to a right triangle, but may be an acute triangle or an obtuse triangle whose blade edge angle is close to a right angle (80 ° to 100 °). This is because the press-fitting direction of the coupler 5 and the contact surface of both the concavo-convex terminals 2a and 8a can be regarded as substantially perpendicular, and the magnitude of the frictional force acting in the direction perpendicular to the press-fitting direction is negligibly small.
(3) When a force perpendicular to the sagittal direction acts on the press-fitting direction:
When a force in the direction of arrow c in FIG. 5 acts on the coupler 5 and a force in the direction of arrow c ′ acts on the LED mounting board 1 side, the concave and convex terminals 2a on the LED mounting board 1 side existing in the sagittal direction and the coupler The contact of both the concavo-convex terminals 2a and 8a is maintained by contact of the tip shape of the blade of the concavo-convex terminal 8a on the 5 side. The same applies to the case where a force in the direction of the arrow c ′ acts on the coupler 5 and a force in the direction of the arrow c acts on the LED mounting substrate 1 side.

By the way, the cross-sectional shape of each of the concave and convex terminals 8a and 2a formed on the electrode 8 of the coupler 5 and the wiring pattern 2 on the LED mounting substrate 1 side is desirable, but it is inevitable that an error occurs in the manufacturing process. Therefore, it is expected that micro deformation as shown in FIGS. However, since pressure due to elasticity acts on the electrode 8 on the coupler 5 side in the direction of the LED mounting substrate 1, both the following deformations (1) to (4) may occur. The electrical connection between the uneven terminals 2a and 8a is maintained.
(1) Spacing between the concave and convex terminals on the LED mounting board side:
Even when the gap between the concave and convex terminals 2a on the LED mounting substrate 1 side is small as shown in FIG. 7 (a) or large as shown in FIG. 7 (b), both the concave and convex terminals 2a and 8a are illustrated. Maintained at contact H or contact I. Since there are a plurality of intervals between the blades of the concave / convex terminals 8a on the coupler 5 side and the blades of the concave / convex terminals 2a on the LED mounting substrate 1 side, the relative positions of the engagement of the concave / convex terminals 2a and 8a are shifted to the left and right. However, even in such a case, the contact is still H or I, and the electrical connection between the two concave and convex terminals 2a and 8a is maintained.
(2) Blade size of the concave and convex terminal on the coupler side:
When the size of the blade of the terminal 8a on the coupler 5 side is small as shown in FIG. 8A or large as shown in FIG. Alternatively, it is maintained at the contact K. Here, the size of the blade of the concavo-convex terminal 8a refers to the length of the short side of a right triangle. The angle of the edge of the blade slightly changes as the length of the short side of the right triangle changes. There is no problem because there is no change.
(3) Shape of the concave and convex terminal blade on the coupler side:
When the shape of the blade of the concavo-convex terminal 8a on the coupler 5 side is an acute triangle as shown in FIG. 9A or an obtuse triangle as shown in FIG. The concavo-convex terminals 2a and 8a are maintained in electrical connection. In addition, even if the cross-sectional shape of the blade of the concave-convex terminal 8a on the coupler 5 side is not a right-angled triangle, the angle other than the blade edge may be a triangle that is close to a right angle (80 ° to 100 °).
(4) Blade tip shape of uneven terminal on LED mounting substrate side:
In the case where the shape of the blade tip of the concavo-convex terminal 2a on the LED mounting substrate 1 side is an acute angle as shown in FIG. 10 (a) or an obtuse angle (80 ° to 100 °) as shown in FIG. 10 (b). However, the electrical connection between the two concave and convex terminals 2a and 8a is maintained at the contacts P and Q or the contacts R.

  Next, the junction structure between the LED mounting substrate 1 and the coupler 5 will be described.

The LED mounting substrate 1 and the coupler 5 are fixed by the following three types of structures (1) to (3) and can be bonded with high reliability.
(1) Engaging structure of uneven terminal:
The engagement structure of the concave / convex terminal 2a on the LED mounting substrate 1 side and the concave / convex terminal 8a on the coupler 5 side has an advantage of being strong in attractive force in the direction opposite to the press-fitting direction of the coupler 5. In addition, since there are a large number of concave and convex terminals 2a and 8a, a large number of electrical contacts are secured.
(2) Au diffusion bonding by frictional heat:
When the LED mounting substrate 1 is press-fitted into the coupler 5, the unevenness of the uneven terminal 8 a of the electrode 8 inside the coupler 5 destroys the wiring pattern 2 of the LED mounting substrate 1 and the oxide film of the electrode 8 inside the coupler 5. Diffusion bonding between the Au plating of the electrode 8 and the Au plating of the wiring pattern 2 of the LED mounting substrate 1 is easily performed. That is, when the coupler 5 is press-fitted into the LED mounting board 1, pressure is generated between the electrode 8 in the coupler 5 and the LED mounting board 1, thereby generating frictional heat. Here, since the electrode 8 in the coupler 5 and the wiring pattern 2 on the LED mounting substrate 1 are plated with Au, diffusion bonding of Au is performed.

  In addition, pressure is always applied to the electrode 8 on the coupler 5 side and the wiring pattern 2 on the LED mounting substrate 1 side by the elasticity of the concave and convex terminals 8a and 2a. Diffusion bonding is promoted.

It is also effective to apply a thermal history after press-fitting the coupler 5 into the LED mounting substrate 1. The longer the thermal history, the more the diffusion bonding proceeds. However, when the thermal history is too long, the deterioration of the LED 3 progresses. Therefore, the upper limit of the thermal history temperature is about 150 ° C., and the optimum time is about several hours. Since Au diffusion bonding is a single Au bonding, deterioration of the bonding property due to heat is suppressed, and the diffusion of Au proceeds due to the application of heat in a high temperature environment or when the LED 3 is driven. Can be more firmly fixed. Moreover, since Au has very soft characteristics, the occurrence of cracks due to heat shock or the like can be suppressed.
(3) Fixing with screws:
The coupler 5 is fixed to the LED mounting substrate 1 by screwing in order to further strengthen the bonding of the LED power feeding unit. By forming the concavo-convex terminal 8a on the electrode 8 inside the coupler 5, diffusion bonding of Au can be easily performed, and a non-dot-like electrical connection is made. In the present embodiment, by separately providing the electrical connection portion and the power supply portion fixing portion, it is possible to prevent the occurrence of problems such as contact failure and dropout of the coupler 5, and to configure a highly reliable power supply portion. it can. In this embodiment, the configuration in which the coupler 5 is fixed with the screw 6 is adopted. However, if the coupler 5 can be fixed only by joining the electrode 8 inside the coupler 5 and the LED mounting substrate 1, the screw 6 is used. Fixing is not always necessary.

  Here, a method of press-fitting the LED mounting substrate 1 into the coupler 5 is shown in FIG.

  Before press-fitting the LED mounting substrate 1, as shown in FIG. 11A, the unevenness 1 a of the LED mounting substrate 1 and the unevenness terminal 2 a of the wiring pattern 2 are formed on the electrode 8 on the coupler 5 side. When the LED mounting substrate 1 is press-fitted into the coupler 5 in the direction indicated by the arrow while maintaining this state, the concave / convex terminal 8a of the electrode 8 on the coupler 5 side changes up and down as indicated by the arrow shown in the figure. Since it spreads, the LED mounting substrate 1 can be easily press-fitted into the electrode 8 (coupler 5) as shown in FIG.

  As an advantage of such a press-fitting method, when both the concavo-convex terminals 2a (concave / convex 1a) and 8a are properly meshed with each other, a contact sound is heard, or contact between the concavo-convex terminals 2a (concave / convex 1a) and 8a can be sensed by skin. Since it can be felt, it can be easily recognized whether or not a correct connection has been made.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  12 is a plan view showing the junction structure of the LED power feeding section according to Embodiment 2 of the present invention, FIG. 13 is a sectional view taken along the line DD in FIG. 12, and FIG. 14 is a sectional view taken along the line EE in FIG. In these drawings, the same elements as those shown in FIGS. 1 to 6 are denoted by the same reference numerals, and repetitive description thereof will be omitted below.

  In the present embodiment, the electrode 9 having the concavo-convex terminals 9a having right-and-left triangular cross sections formed on the upper and lower surfaces is sandwiched between the concavo-convex terminals 2a of the wiring pattern 2 of the LED mounting substrate 1 by the fixing member 10 made of heat-resistant resin. It is characterized in that an LED power feeding unit is configured.

  The fixing member 10 is made of resin material or ceramic material such as PPS, polycarbonate, kapton material, alumina, AlN, etc., which has no electrical conductivity, and has unevenness formed on the electrode 9 on its lower surface. A plurality of projections and depressions 10a having a rectangular cross section that engage with the terminals 9a are formed. The material of the electrode 9 is a Cu alloy such as phosphor bronze or brass, but besides the Cu alloy, a material that can prevent elastic deterioration at high temperatures by adding other elements is used. can do.

  Thus, the fixing member 10 is fixed to the LED mounting board 1 by screws 11 inserted through both ends thereof, and the electrode 9 is sandwiched between the fixing pattern 10 and the wiring pattern of the LED mounting board 1 to fix it. At this time, the concavo-convex terminals 9a formed on the upper and lower surfaces of the electrode 9 are engaged with the concavo-convex terminals 10a formed on the fixing member 10 and the concavo-convex terminals 2a formed on the wiring pattern 2, respectively. 2 is electrically connected.

  As described above, in the present embodiment, the electrode 9 is sandwiched between the LED mounting substrate 1 by the fixing member 10 to be screwed, and the uneven terminal 9a of the electrode 9 and the uneven terminal 2a of the wiring pattern 2 are Since the electrode 9 and the wiring pattern 2 are electrically joined by the meshing, the configuration is simple, the manufacturing time is shortened, and the manufacturing cost is kept low.

  In the above embodiment, the concave and convex terminals 8a and 9a on the electrodes 8 and 9 side are configured by arranging a plurality of blades having a substantially right-angled triangle cross section, and the concave and convex terminals 2a on the wiring pattern 2 side are formed with a blade having a substantially rectangular cross section. Contrary to this, the concave and convex terminals 8a and 9a on the electrodes 8 and 9 side are configured by arranging a plurality of substantially rectangular blades and the concave and convex terminals 2a on the wiring pattern 2 side are cross-sectioned. Even if a plurality of substantially right triangle blades are arranged, the same effect as described above can be obtained.

  The present invention can be applied to a power feeding portion joining structure of an LED provided for an arbitrary use, such as a backlight LED, a vehicle lamp LED, and an illumination LED.

It is a perspective view which shows the junction structure of the LED electric power feeding part which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows the joining structure of the LED electric power feeding part which concerns on Embodiment 1 of this invention. It is a top view which shows the junction structure of the LED electric power feeding part which concerns on Embodiment 1 of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the B section enlarged detail drawing of FIG. It is CC sectional view taken on the line of FIG. (A), (b) is a figure which shows the contact state of the uneven | corrugated terminal of the LED mounting board | substrate side and coupler side by the difference in the space | interval of the blade of the uneven | corrugated terminal on the LED mounting board | substrate side. (A), (b) is a figure which shows the contact state of the LED mounting substrate side and the uneven terminal of a coupler side by the difference in the magnitude | size of the blade of the uneven terminal of a coupler side. (A), (b) is a figure which shows the contact state of the uneven | corrugated terminal of the LED mounting board side and coupler side by the difference in the shape of the blade of the uneven | corrugated terminal on the coupler side. (A), (b) is a figure which shows the contact state of the uneven | corrugated terminal of the LED mounting board | substrate side and coupler side by the difference in the blade tip shape of the uneven | corrugated terminal of the LED mounting board | substrate side. (A), (b) is a fragmentary sectional view which shows the press injection method to the coupler of a LED mounting board. It is a top view which shows the joining structure of the LED electric power feeding part which concerns on Embodiment 2 of this invention. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED mounting substrate 1A Cu layer of LED mounting substrate 1B Insulating layer of LED mounting substrate 1a Concavity and convexity of LED mounting substrate 2 Wiring pattern 2a Concavity and convexity terminal of wiring pattern 3 LED
4 Thermal conductive adhesive 5 Coupler 5a Coupler bracket 6 Screw 7 Au wire (Al wedge)
8,9 electrode 8a, 9a electrode uneven terminal 10 fixing member 10a fixing member uneven 11 screw

Claims (5)

A connection structure of an LED power feeding portion that extends a wiring pattern formed on an insulating layer of an LED mounting substrate on which an LED is mounted to an end portion of the LED mounting substrate and electrically connects an electrode connected to a power source and the wiring pattern. In
One of the electrodes or the wiring pattern is formed with a concavo-convex terminal formed by arranging a plurality of substantially right-angled triangular blades in a direction parallel to the short side, and the other is formed by arranging a plurality of substantially rectangular blades. A joining structure of an LED power feeding part, wherein an uneven terminal is formed and the electrode and the wiring pattern are electrically joined by engaging both the uneven terminals. The bonding structure of the LED power feeding unit according to claim 1, wherein Au plating is applied to surfaces of the electrodes and the wiring pattern.
  The electrode is disposed inside a coupler made of a non-conductive heat-resistant resin, and the electrode and the wiring pattern are electrically joined by press-fitting the coupler together with the electrode into the LED mounting board. The junction structure of the LED power feeding part according to claim 1 or 2.   4. The LED power feeding portion joining structure according to claim 3, wherein the coupler is fixed to the LED mounting board by screws.   3. The electrode and the wiring pattern are electrically joined by sandwiching the electrode with the LED mounting substrate by a fixing member screwed to the LED mounting substrate. The junction structure of the LED power feeding portion described.

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