JP2005159260A - LED connection circuit structure - Google Patents

Abstract

【Task】
A circuit structure in which a large number of LEDs are connected in series and parallel is easily manufactured. Improve heat dissipation of LED generated heat. A large number of LEDs can be easily arranged in a three-dimensional shape. It is possible to flexibly cope with various three-dimensional shapes and design changes.
[Solution]
A flat cable 10 having three or more flat conductors 16A to 16C is used as a wiring material for connecting a large number of LEDs 12. The two flat conductors 16A and 16C on both sides are connected to the power source 32. A flat conductor cut portion 36 is provided at a required portion of the intermediate flat conductor 16B. The LED 12B is connected between the flat conductors 16B and 16B separated by the cutting portion 36, the LED 12A is connected between the flat conductors 16A and 16B, and the LED 12C is connected between 16B and 16C. Thus, a series-parallel circuit in which a plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series is connected in parallel is configured.
[Selection] Figure 1

Description

  The present invention relates to an LED connection circuit structure that uses a large number of LEDs (light emitting diodes) and is applied to a light source of an automobile.

  Many LEDs are used for the front and rear lamps of automobiles, which consume less power and have a longer life compared to light bulbs using filaments. Conventionally, round wires and bus bars have been used as wiring materials for supplying power to these LEDs (see Patent Document 1). Normally, these LEDs are used in a series-parallel circuit configuration in which a plurality of series circuits in which a plurality of LEDs are connected in series are connected in parallel (see Patent Documents 1 and 2).

  In recent years, the amount of heat generation has increased with the increase in brightness of LEDs. As a countermeasure, wiring materials such as bus bars and round electric wires to which LEDs are connected are also used as heat radiators.

JP-A-10-208515 JP-A-6-318732

  However, in order to connect a large number of LEDs in series and parallel with a round wire or bus bar, a variety of round wires or bus bars of a predetermined length are prepared and used to connect a large number of LEDs to a predetermined circuit pattern. Preparation work and connection work of a round electric wire and a bus bar are troublesome. Moreover, since a round wire has a small surface area with respect to a conductor cross-sectional area, heat dissipation is not good. On the other hand, the bus bar has better heat dissipation than the round electric wire, but it is not flexible, so it is necessary to bend in advance to arrange a large number of LEDs in three dimensions according to the curved lens shape of the lamp. In addition to high costs, it is difficult to flexibly cope with lens shape and design changes.

  The objective of this invention is providing the LED connection circuit structure which solved the above subjects.

  The LED connection circuit structure according to the present invention uses, as a wiring material for connecting a large number of LEDs, a flat cable in which three or more flat conductors arranged in parallel are collectively covered with an insulation coating, and a required portion of the flat cable. Between at least the former between the cut portion of the flat conductor and the short-circuit portion of the two flat conductors, and between the flat conductors separated by the cut portion and / or between the two flat conductors not short-circuited by the short-circuit portion A series-parallel circuit in which a plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series by connecting the LEDs to each other is connected in parallel is characterized.

  One more specific example of the LED connection circuit structure according to the present invention is a flat cable in which a collective insulation coating is applied to three or more flat conductors arranged in parallel as a wiring material for connecting a large number of LEDs. The flat conductor of this flat cable is provided with a cut portion of the flat conductor at a required portion of the flat conductor other than the two flat conductors connected to the power source, and between the flat conductors separated by the cut portion and the cut A plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series are connected in parallel by connecting an LED between a flat conductor having a portion and a flat conductor having no cutting portion. A series-parallel circuit is configured.

  Another more specific example of the LED connection circuit structure according to the present invention is a flat cable in which a collective insulation coating is applied to three or more flat conductors arranged in parallel as a wiring material for connecting a large number of LEDs. The flat conductor of this flat cable is provided with a cut portion of the flat conductor at a required portion of the flat conductor other than the two flat conductors connected to the power source, and the LED is placed between the flat conductors separated by this cut portion. A plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series by providing a short circuit portion between the flat conductor provided with the cut portion and the flat conductor not provided with the cut portion are connected. A series-parallel circuit connected in parallel is configured.

  A more specific and different example of the LED connection circuit structure according to the present invention is a flat in which collective insulation coating is applied to four or more flat conductors arranged in parallel as a wiring material for connecting a large number of LEDs. Using a cable, a flat conductor cut portion is provided at a required portion of the flat conductor other than the two flat conductors connected to the power source among the flat conductors of the flat cable, and an LED is connected between the flat conductors provided with the cut portions. A plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series by providing a short circuit portion between the flat conductor provided with the cut portion and the flat conductor not provided with the cut portion are connected. A series-parallel circuit connected in parallel is configured.

  A more specific and different example of the LED connection circuit structure according to the present invention is a flat in which collective insulation coating is applied to four or more flat conductors arranged in parallel as a wiring material for connecting a large number of LEDs. Using a cable, a cut portion of the flat conductor is provided at a required portion of the flat conductor other than the two flat conductors connected to the power source among the flat conductors of the flat cable, and between the flat conductors provided with the cut portion and the cut A plurality of series circuits in which a number of LEDs having a lighting voltage exceeding the minimum lighting voltage are connected in series are connected in parallel by connecting an LED between a flat conductor having a portion and a flat conductor having no cutting portion. A series-parallel circuit is configured.

  A more specific and different example of the LED connection circuit structure according to the present invention is a flat cable in which two flat conductors arranged in parallel are collectively covered with insulation as a wiring material for connecting a large number of LEDs. When one flat conductor is cut at one place or a plurality of places in the longitudinal direction of the flat cable and the other flat conductor is not cut, and the one cut section is provided at a plurality of places. By connecting a plurality of LEDs between two flat conductors in each section of the flat cable divided in the longitudinal direction at the one-side cut portion, provided so that the two flat conductors are alternately cut, A parallel series circuit in which a plurality of parallel circuits in which a plurality of LEDs are connected in parallel is connected in series is configured.

  A more specific and different example of the LED connection circuit structure according to the present invention is a flat cable in which two flat conductors arranged in parallel are collectively covered with insulation as a wiring material for connecting a large number of LEDs. The flat cable is provided with a short-circuit portion of two flat conductors at a plurality of locations in the longitudinal direction of the flat cable, and the cut portion of the flat conductor is provided in a required section of the flat conductor divided in the longitudinal direction by the short-circuit portion. A series-parallel circuit in which a plurality of series circuits in which a plurality of LEDs are connected in series is connected in parallel is provided by providing LEDs in a plurality of places so as to straddle each cutting portion. It is.

In the LED connection circuit structure according to the present invention, the cut portion of the flat conductor is preferably provided by making a hole in the flat cable for cutting the flat conductor.
In the LED connection circuit structure according to the present invention, the short-circuit portion between the flat conductors uses a short-circuit member in which piercing pieces are formed at both ends, and the piercing pieces at both ends of the short-circuit member are flat to be short-circuited in the flat cable. It is preferably provided by piercing at a position where there is a conductor and bending and caulking the tip of the piercing piece penetrating the flat cable.

  In the LED connection circuit structure according to the present invention, the connection part between the LED lead and the flat conductor of the flat cable has the LED lead arranged at the position where the flat conductor of the flat cable is located, and the piercing connection straddling the LED lead The piercing piece of the child is preferably pierced at a position where the flat conductor of the flat cable is located, and the tip of the piercing piece penetrating the flat cable is bent and caulked.

  In the LED connection circuit structure according to the present invention, the connection portion between the LED lead and the flat conductor of the flat cable forms a stab piece on the LED lead toward the flat cable, and the stab piece is a flat conductor of the flat cable. It may be formed by piercing at a certain position and bending and caulking the tip of the piercing piece penetrating the flat cable.

  In the LED connection circuit structure according to the present invention, the connection part between the LED lead and the flat conductor of the flat cable has the LED lead arranged at the position where the flat conductor of the flat cable is located, and the piercing connection straddling the LED lead It is formed by inserting the piercing piece of the child into a position where the flat conductor of the flat cable is located, and inserting the tip of the piercing piece penetrating the flat cable into the slot of the receiving plate arranged on the back side of the flat cable. There may be.

  In the LED connection circuit structure according to the present invention, the connection portion between the LED lead and the flat conductor of the flat cable forms a stab piece on the LED lead toward the flat cable, and the stab piece is a flat conductor of the flat cable. It may be formed by piercing at a certain position and inserting the tip of the piercing piece penetrating the flat cable into the slot of the receiving plate arranged on the back side of the flat cable.

  The LED connection circuit structure according to the present invention can have a configuration in which a large number of LEDs are three-dimensionally arranged by bending a flat cable.

  In the LED connection circuit structure according to the present invention, in order to further improve the heat dissipation of the LED, it is preferable to integrally provide a heat dissipation plate portion on the LED lead.

  According to the present invention, a plurality of LEDs can be connected in series and parallel by providing a cut portion of a flat conductor at a required portion of the flat cable, or by providing a short portion of the flat conductor, Compared to the case of using a bus bar, the wiring material preparation work and the LED connection work can be performed easily and efficiently. Moreover, since the flat cable uses the flat conductor, the surface area of the conductor is larger than that of the round electric wire, and the heat dissipation is good. Furthermore, it is easy to arrange a large number of LEDs in conformity with the lens shape of the lamp, and it is possible to flexibly cope with different types of lamp devices and design changes.

  The cut portion of the flat conductor can be easily formed by punching a hole in the flat cable.

  Further, the short-circuit portion of the flat conductor can be easily formed by using a piercing-type short-circuit member without peeling off the insulation coating of the flat cable.

  Further, the flat conductor of the flat cable and the LED lead can be easily connected by using a piercing-type connector or lead without removing the insulation coating of the flat cable. Furthermore, it has also been experimentally clarified that when the flat conductor of the flat cable and the LED lead are connected by a piercing connector or lead, the heat dissipation is better than when a bus bar is used as the wiring material.

Embodiment 1 FIG. 1 shows an embodiment of an LED connection circuit structure according to the present invention. In the figure, 10 is a flat cable, and 12 is an LED mounted at a predetermined position of the flat cable 10.

  The flat cable 10 is obtained by applying a collective insulating coating 18 to three flat conductors 16A to 16C arranged in parallel by bonding a plastic film (polyethylene terephthalate film or the like). The flat conductor 16 is, for example, a copper tape having a thickness of 0.15 mm and a width of 5.2 mm. Of the three flat conductors, the flat conductors 16A and 16C on both sides are connected to a power source 32 having a control circuit 34 as shown in FIG. The intermediate flat conductor 16B is provided with a flat conductor cut portion 36 at a required location and is divided in the longitudinal direction. The cutting part 36 can be easily formed by making a hole in the flat cable 10 by punching or the like.

  The LED 12B is connected to the flat conductor 16B so as to straddle every other cut portion 36. At both ends of the LED 12B, the LED 12A is connected between the flat conductors 16A and 16B, and the LED 12C is connected between the flat conductors 16C and 16B. It is connected. As a result, a series-parallel circuit in which a plurality of series circuits in which the three LEDs 12A to 12C are connected in series is connected in parallel is configured.

  In general, it is considered that a lamp device for a vehicle is desirably lit from at least 8V. For example, if the LED has a rating of 3V, a circuit in which three LEDs are connected in series becomes 9V and exceeds the minimum lighting voltage. Become. Therefore, in the embodiment of FIG. 1, one unit is formed by connecting three LEDs 12 in series, and a plurality of units are connected in parallel. The number of LEDs connected in series and the number of series circuits connected in parallel are arbitrary.

  Such an LED connection circuit structure can be manufactured simply by providing the cut portion 36 in the single flat cable 10 and connecting the LEDs 12A to 12C, and is easy to manufacture. Further, since a flat conductor (having a large surface area) serves as a heat radiator, heat dissipation is also good.

  The flat cable 10 and the LED 12 can be connected as shown in FIG. In this connection structure, the pair of leads 20 of the LED 12 is placed at a position where the flat conductor 16 of the flat cable 10 is located without peeling off the insulating coating 18 of the flat cable 10, and a piercing connector 22 as shown in FIG. Is used to connect the lead 20 and the flat conductor 16. The connector 22 is obtained by processing a metal plate and forming piercing pieces 26 on both sides of the back plate portion 24 downward. The connector 22 is straddled across the lead 20, the piercing piece 26 is pierced at a position where the flat conductor 16 of the flat cable 10 is located, and the tip of the piercing piece 26 penetrating the flat cable 10 is bent inward. By crimping, the lead 20 and the flat conductor 16 are connected.

  The flat cable 10 and the LED 12 can be connected as follows. For example, in the connection structure shown in FIG. 4, a piercing piece 26 is formed downward on both sides of the lead 20 of the LED 12 as shown in FIG. 5, and the piercing piece 26 is pierced at a position where the flat conductor 16 of the flat cable 10 is located. The tip of the piercing piece 26 that penetrates the flat cable 10 is bent and crimped inward.

  Further, in the connection structure shown in FIG. 6, the pair of leads 20 of the LED 12 is placed at a position where the flat conductor 16 of the flat cable 10 is located, and the connector 22 as shown in FIG. 3 and the slot 30 as shown in FIG. The lead 20 and the flat conductor 16 are connected to each other using a receiving plate 28 having the following. That is, the lead 20 and the flat conductor 16 have the connector 22 straddling the lead 20, the piercing piece 26 is pierced at a position where the flat conductor 16 of the flat cable 10 is located, and the piercing piece 26 penetrating the flat cable 10 is inserted. The distal end portion is connected by being inserted and fixed in the slot 30 of the receiving plate 28 disposed on the back side of the flat cable 10.

  Further, the connection structure shown in FIG. 8 uses the LED 12 in which the piercing piece 26 is formed on the lead 20 as shown in FIG. 5 and the receiving plate 28 having the slot 30 as shown in FIG. That is, the lead 20 and the flat conductor 16 pierce the piercing piece 26 of the lead 20 into a position where the flat conductor 16 of the flat cable 10 is located, and the tip of the piercing piece 26 penetrating the flat cable 10 is connected to the flat cable 10. It is connected by being inserted and fixed in the slot 30 of the receiving plate 28 arranged on the back side.

  In the connection structure shown in FIGS. 6 and 8, the width of the slot 30 of the receiving plate 28 is slightly larger than the thickness of the piercing piece 26 as shown in FIGS. 6 (D) and 8 (D). The piercing piece 26 may be inserted into the slot 30 tightly while the part of the flat conductor 16 that has been broken is wound around the slot 30 and stretched. If it does in this way, the contact area of the piercing piece 26 and the flat conductor 16 will become large, while being able to obtain a favorable electrical connection state, the pull-out of the piercing piece 26 can be prevented.

  When the connection structure as described above is adopted, the flat conductor 16 of the flat cable 10 and the lead 20 of the LED 12 can be easily and reliably connected without stripping the flat cable insulation coating 18 or by soldering. Can do.

  It has also been found that when the LED leads are pierced into the flat cable and connected by the connection method as described above, the heat dissipation effect of the LED is improved. In general, an LED generates heat when turned on, and it is necessary to dissipate the heat to some extent. The heat radiation of the LED is usually performed by a circuit conductor to which the LED is connected. For this reason, the round electric wire and bus bar to which the LED is connected increase the surface area by increasing the conductor outer diameter and bus bar width, thereby enhancing the heat dissipation effect. However, since the heat radiation action of the circuit conductor occurs only in the range of about 100 mm from the connection position of the LED, it is uneconomical to increase the conductor outer diameter and bus bar width over the entire circuit length. In addition, there is a problem that the manufacturing cost increases if the conductor outer diameter or the bus bar width is increased only in the vicinity of the connection position of the LED to make it special. Adopting the piercing connection method can avoid such a problem.

  FIG. 9 shows the results of measuring the temperature rise at each position of the circuit conductor when the LED and the circuit conductor are pierced and connected by the connection method and when they are connected by the soldering method. ○ indicates that the LED lead is connected to the flat cable (FFC) having a copper flat conductor with a thickness of 0.15 mm and a width of 5.2 mm using the piercing connection method shown in FIG. When soldering is connected by soldering, the + mark indicates that the LED lead is connected by soldering to a copper bus bar having a thickness of 0.5 mm and a width of 5.2 mm. The value of the temperature rise is a value at equilibrium when a rated current of 150 mA is passed.

  As is apparent from this graph, even when the same flat cable is used, the piercing connection using the connector has a lower temperature rise than the soldering connection. This is thought to be due to the fact that the connector exerts a heat sink function in addition to the electrical connection function, thereby suppressing the temperature rise. Further, the flat cable has a lower temperature rise than a bus bar having a large conductor cross-sectional area. This phenomenon is thought to be because the flat insulating coating does not accumulate heat but conducts heat and diffuses and dissipates most of the heat. From this test result, it was confirmed that the heat dissipation action is better in the structure in which the lead of the LED is pierced and connected using a flat cable as a circuit conductor than in the structure in which the lead of the LED is soldered and connected to a conventional bus bar.

  Moreover, the LED connection circuit structure of this invention can arrange | position many LED12 easily in three dimensions by bending the flat cable 10 with which many LED12 was connected. An example is shown in FIG. Reference numeral 14 denotes a support base formed in a step shape in accordance with the curved lens shape of the lamp. By bending the flat cable 10 to which a large number of LEDs 12 are connected three-dimensionally along the surface of the support base 14, the large number of LEDs 12 can be three-dimensionally arranged in accordance with the lens shape. The flat cable 10 may be fixed to the support base 14 by forming a fixing claw 19 on the support base 14.

Embodiment 2 FIG. 11 shows another embodiment of the LED connection circuit structure according to the present invention. This embodiment is also a case where a flat cable 10 having three flat conductors 16A to 16C is used. The flat conductors 16A and 16C on both sides are connected to the power source 32 via the control circuit 34, and cut portions 36 are formed at a required interval in the intermediate flat conductor 16B. Three LEDs 12 </ b> A to 12 </ b> C are connected to the three continuous cutting portions 36 so as to straddle them, and a series circuit of LEDs is formed. A plurality of LED series circuits are formed, and adjacent LED series circuits are divided by one cutting portion 36 left between them. The flat conductors 12A and 12B are short-circuited by the short-circuit member 38 at one end side of each LED series circuit, and the flat conductors 12C and 12B are short-circuited by the short-circuit member 38 at the other end side. As a result, a series-parallel circuit in which a plurality of series circuits in which the three LEDs 12A to 12C are connected in series is connected in parallel is configured.

For example, as shown in FIG. 12, the short-circuit member 38 has both ends of a plate-like conductor formed along two flat conductors, and the piercing pieces 26 similar to the connector of FIG. 3 are formed at both ends. It is a thing. When such a short-circuit member 38 is used, the piercing pieces 26 at both ends are pierced into the two flat conductors 16 of the flat cable 10 and the tip portion of the piercing piece 26 penetrating the flat cable 10 is bent inward. By simply caulking, it is possible to easily form a short-circuit portion between two flat conductors.
Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

Embodiment 3 FIG. 13 shows still another embodiment of the LED connection circuit structure according to the present invention. In this embodiment, a flat cable 10 having four flat conductors 16A to 16D is used. The outer two flat conductors 16A and 16D are connected to the power source 32 via the control circuit 34, and the inner two flat conductors 16B and 16C are alternately formed with cut portions 36 at a required interval. Between the flat conductors 16B and 16C divided by the cutting portion 36, three LEDs 12A to 12C are connected to form a series circuit. The flat conductors 12A and 12B are short-circuited by the short-circuit member 38 on one end side of each LED series circuit, and the flat conductors 12D and 12C are short-circuited by the short-circuit member 38 on the other end side. As a result, a series-parallel circuit in which a plurality of series circuits in which the three LEDs 12A to 12C are connected in series is connected in parallel is configured. The short-circuit member 38 is the same as that used in the second embodiment.
Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

Embodiment 4 FIG. 14 shows still another embodiment of the LED connection circuit structure according to the present invention. This embodiment is also a case where a flat cable 10 having four flat conductors 16A to 16D is used. The outer two flat conductors 16A and 16D are connected to the power source 32 via the control circuit 34, and the inner two flat conductors 16B and 16C have cut portions 36 formed at the same positions in the longitudinal direction at a required interval. Yes. For each unit length of the flat conductors 16B and 16C divided by the cutting portion 36, the LED 12A is connected between the flat conductors 12A and 12B, the LED 12B is connected between the flat conductors 12B and 12C, and the LED 12C is connected between the flat cables 12C and 12D. ing. As a result, a series-parallel circuit in which a plurality of series circuits in which the three LEDs 12A to 12C are connected in series is connected in parallel is configured.
Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted.

Embodiment 5 FIGS. 15A and 15B show still another embodiment of the LED connection circuit structure according to the present invention. In this embodiment, a flat cable 10 having two flat conductors 16A and 16B is used. In this embodiment, one flat conductor is cut at two locations in the longitudinal direction of the flat cable 10 (or three or more locations), and the other flat conductor is not cut. 16B are cut alternately. Reference numeral 36 denotes a cut portion of the flat conductors 16A and 16B. Then, three LEDs 12A to 12C are connected between the two flat conductors 16A and 16B in each section of the flat cable 10 divided in the longitudinal direction by the one-side cut portion K, respectively. As a result, as shown in FIG. 6C, a parallel series circuit in which a plurality of parallel circuits in which the three LEDs 12A to 12C are connected in parallel is connected in series is configured.

  Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted. Since this embodiment only requires two flat conductors for the flat cable, space saving and cost reduction can be achieved as compared with the case of using a flat cable having three or more flat conductors.

Embodiment 6 FIGS. 16A and 16B show still another embodiment of the LED connection circuit structure according to the present invention. This embodiment is also a case where a flat cable 10 having two flat conductors 16A and 16B is used. In this embodiment, the short circuit part T which short-circuited the two flat conductors 16A and 16B with the short circuit member 38 is provided in two places of the flat cable 10 in the longitudinal direction. Then, three flat conductor cutting portions 36 are provided in each of the two flat conductors 16A and 16B in the section sandwiched between the short-circuit portions T and one flat conductor 16B outside the section, LED12A-12C is connected so that it may straddle. Furthermore, both ends of the flat conductor 16 </ b> B in which the LEDs 12 </ b> A to 12 </ b> C are connected to the two sections are short-circuited by the electric wires 44. As a result, as shown in FIG. 5C, a series-parallel circuit in which a plurality of series circuits in which the three LEDs 12A to 12C are connected in series is connected in parallel is configured. As the short-circuit member 38, the one shown in FIG. Further, as the connection member 46 for connecting the electric wire 44 and the flat conductor 16B, it is preferable to use a terminal integrally formed with a piercing piece 26 for the flat conductor 16B as shown in FIG.

  Since the configuration other than the above is the same as that of the first embodiment, the description thereof is omitted. Even in such an embodiment, the same effect as in the fifth embodiment can be obtained. In this embodiment, the electric wires 44 are used. However, when the flat cable 10 is bent and three-dimensionally wired as shown in FIG. 10, the distance between both ends of the flat cable 10 is much shorter than the length of the flat cable 10. Therefore, the length of the electric wire 44 may be considerably shorter than that of the flat cable 10.

Embodiment 7 FIG. 17 shows still another embodiment of the present invention. In this embodiment, a heat radiating plate 40 having a width wider than that of the flat conductor 16 of the flat cable 10 is integrally formed on the lead 20 of the LED 12. Such a lead 20 with the heat radiating plate portion 40 uses a metal plate having a width wider than that of the flat conductor as a lead metal plate, and a notch 42 is formed in a part thereof to make the width narrower than that of the flat conductor 16. By forming the lead 20, it can be formed easily. The lead 20 is connected to the flat conductor 16 by a connector 22 as in FIG. When the LED 12 in which the heat radiating plate portion 40 is provided on such a lead 20 is used, the heat radiation effect of the LED can be enhanced without increasing the width of the flat conductor for heat radiation.

  In addition, it is the same as that of the said Embodiments 1-4 that a cut part is provided in the flat cable 10, or a short circuit part is provided and a series-parallel circuit of LED is comprised.

BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment of the LED connection circuit structure which concerns on this invention is shown, (A) is a top view, (B) is a bottom view, (C) is a connection circuit diagram. An example of the connection structure of a flat cable and LED used for the LED connection circuit structure of the present invention is shown, (A) is a plan view, (B) is a front view, (C) is a bottom view, and (D) is ( The DD sectional expanded sectional view of B). The stab type | mold connector used for the connection structure of FIG. 2 is shown, (A) is a front view, (B) is a side view. The other example of the connection structure of a flat cable and LED used for the LED connection circuit structure of this invention is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, (D) (D) The DD sectional view taken on the line of (B). The LED used for the connection structure of FIG. 4 is shown, (A) is a plan view, (B) is a front view, and (C) is a CC line arrow view of (B). The other example of the connection structure of a flat cable and LED used for the LED connection circuit structure of this invention is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, (D ) Is an enlarged sectional view taken along line DD of (B). The perspective view which shows the receiving plate used for the connection structure of FIG. The other example of the connection structure of a flat cable and LED used for the LED connection circuit structure of this invention is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, (D ) Is an enlarged sectional view taken along line DD of (B). The graph which shows the result of having measured the temperature rise in each position of a circuit conductor when the LED and the circuit conductor are pierced and connected by a connection method and when connected by a soldering method. The perspective view which shows an example of the three-dimensional light-emitting structure comprised using the LED connection circuit structure of this invention. The other embodiment of the LED connection circuit structure which concerns on this invention is shown, (A) is a top view, (B) is a bottom view, (C) is a connection circuit diagram. FIG. 11 shows a short-circuit member used for short-circuiting between flat conductors in FIG. 11, (A) is a plan view, (B) is a front view, and (C) is a side view. The other embodiment of the LED connection circuit structure which concerns on this invention is shown, (A) is a top view, (B) is a bottom view, (C) is a connection circuit diagram. Similarly, another embodiment is shown, (A) is a plan view, (B) is a bottom view, and (C) is a connection circuit diagram. Similarly, another embodiment is shown, (A) is a plan view, (B) is a bottom view, and (C) is a connection circuit diagram. Similarly, another embodiment is shown, (A) is a plan view, (B) is a bottom view, and (C) is a connection circuit diagram. The top view which shows the other example of LED used for the LED connection circuit structure of this invention.

Explanation of symbols

10: Flat cable 12: LED
14: support base 16: flat conductor 18: insulation coating 20: lead 22: piercing connector 24: back plate portion 26: piercing piece 28: receiving plate 30: slot 32: power supply 34: control circuit 36: cutting portion 38: Short-circuit member K: One-side cut portion T: Short-circuit portion

Claims (15)

As a wiring material for connecting a large number of LEDs, a flat cable formed by applying a batch insulation coating to three or more flat conductors arranged in parallel is used.
At least the former of the cut portion of the flat conductor and the short-circuit portion of the two flat conductors is provided at a required portion of the flat cable, and the flat conductors separated by the cut portion and / or are not short-circuited by the short-circuit portion. An LED connection circuit structure comprising a series-parallel circuit in which a plurality of series circuits in which a plurality of LEDs are connected in series are connected in parallel by connecting the LEDs between two flat conductors. As a wiring material for connecting a large number of LEDs, a flat cable formed by applying a batch insulation coating to three or more flat conductors arranged in parallel is used.
Of the flat conductors of this flat cable, cut portions of the flat conductors are provided at required portions of the flat conductors other than the two flat conductors connected to the power source, and the cut conductors are provided between the flat conductors separated by the cut portions. A series-parallel circuit in which a plurality of series circuits in which a plurality of LEDs are connected in series is connected in parallel by connecting an LED between the flat conductor and a flat conductor without a cut portion. Connection circuit structure. As a wiring material for connecting a large number of LEDs, a flat cable formed by applying a batch insulation coating to three or more flat conductors arranged in parallel is used.
In the flat conductor of this flat cable, a cut portion of the flat conductor is provided at a required portion of the flat conductor other than the two flat conductors connected to the power source, and the LED is connected between the flat conductors separated by the cut portion. By providing a short-circuit portion between the flat conductor provided with the cut portion and the flat conductor not provided with the cut portion, a plurality of series circuits in which a plurality of LEDs are connected in series constitutes a series / parallel circuit connected in parallel. The LED connection circuit structure characterized by the above-mentioned. As a wiring material for connecting a large number of LEDs, a flat cable formed by applying a collective insulation coating to four or more flat conductors arranged in parallel is used.
The flat conductor of the flat cable is provided with a cut portion of the flat conductor at a required portion of the flat conductor other than the two flat conductors connected to the power source, and the LED is connected between the flat conductors provided with the cut portion, A series-parallel circuit in which a plurality of series circuits in which a plurality of LEDs are connected in series is connected in parallel is configured by providing a short-circuit portion between the flat conductor having the cut portion and the flat conductor having no cut portion. An LED connection circuit structure characterized by the above. As a wiring material for connecting a large number of LEDs, a flat cable formed by applying a collective insulation coating to four or more flat conductors arranged in parallel is used.
Of the flat conductors of the flat cable, cut portions of the flat conductors are provided at required portions of the flat conductors other than the two flat conductors connected to the power source, and the cut conductors are provided between the flat conductors provided with the cut portions. An LED connection characterized in that a series circuit in which a plurality of LEDs are connected in series constitutes a series-parallel circuit in which a plurality of series circuits are connected in parallel by connecting an LED between the flat conductor and a flat conductor without a cut portion. Circuit structure. As a wiring material for connecting a large number of LEDs, a flat cable formed by collectively covering two flat conductors arranged in parallel is used.
When one flat conductor is cut at one or a plurality of locations in the longitudinal direction of the flat cable and the other flat conductor is not cut, two flats are provided. A plurality of LEDs are provided by connecting a plurality of LEDs between two flat conductors in each section of a flat cable that is provided so that conductors are alternately cut and sectioned in the longitudinal direction at the one-side cut portion. An LED connection circuit structure comprising a parallel series circuit in which a plurality of parallel circuits connected in parallel are connected in series. As a wiring material for connecting a large number of LEDs, a flat cable formed by collectively covering two flat conductors arranged in parallel is used.
Two flat conductor short-circuit portions are provided at a plurality of locations in the longitudinal direction of the flat cable, and a plurality of flat conductor cut portions are provided in a required section of each flat conductor divided in the longitudinal direction by the short-circuit portions. An LED connection circuit comprising a series-parallel circuit in which a plurality of series circuits in which a plurality of LEDs are connected in series are connected in parallel by connecting the LEDs so as to straddle each cutting portion. Structure.   8. The LED connection circuit structure according to claim 1, wherein the cut portion of the flat conductor is provided by making a hole for cutting the flat conductor in the flat cable. Connection circuit structure.   The LED connection circuit structure according to any one of claims 1 to 4 and 7, wherein the short-circuit portion between the flat conductors uses a short-circuit member formed with piercing pieces at both end portions, and the short-circuit portion between the both ends of the short-circuit member. An LED connection circuit characterized by being provided by piercing a stab piece at a position where a flat conductor to be short-circuited of a flat cable is located and bending and crimping a tip of the stab piece penetrating the flat cable. Structure.   8. The LED connection circuit structure according to claim 1, wherein the connection portion between the LED lead and the flat conductor of the flat cable has the LED lead disposed at a position where the flat conductor of the flat cable is located. The piercing piece of the piercing-type connector straddling the LED lead is pierced at a position where the flat conductor of the flat cable is located, and the tip portion of the piercing piece penetrating the flat cable is bent and caulked. The LED connection circuit structure characterized by the above-mentioned.     The LED connection circuit structure according to any one of claims 1 to 7, wherein a connection portion between the LED lead and the flat conductor of the flat cable forms a stab piece on the LED lead toward the flat cable, An LED connection circuit structure, wherein the piercing piece is formed by piercing a flat cable in a position where a flat conductor is provided and bending and caulking the tip of the piercing piece penetrating the flat cable.   8. The LED connection circuit structure according to claim 1, wherein the connection portion between the LED lead and the flat conductor of the flat cable has the LED lead disposed at a position where the flat conductor of the flat cable is located. The piercing piece of the piercing-type connector straddling the LED lead is pierced at the position where the flat conductor of the flat cable is located, and the tip of the piercing piece penetrating the flat cable is inserted into the slot of the receiving plate arranged on the back side of the flat cable An LED connection circuit structure characterized in that the LED connection circuit structure is formed.   The LED connection circuit structure according to any one of claims 1 to 7, wherein a connection portion between the LED lead and the flat conductor of the flat cable forms a stab piece on the LED lead toward the flat cable, This piercing piece is formed by piercing the flat cable in a position where the flat conductor is located, and inserting the tip of the piercing piece penetrating the flat cable into the slot of the receiving plate arranged on the back side of the flat cable. LED connection circuit structure.   14. The LED connection circuit structure according to claim 1, wherein a plurality of LEDs are arranged three-dimensionally by bending a flat cable. 14. The LED connection circuit structure according to claim 1, wherein a heat radiating plate portion is integrally provided on the LED lead.

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