JP2007112299A - Flexible wiring board for lighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively materialize excessive length absorption by bending or cutting or coping with multiple product numbers. <P>SOLUTION: On a flexible insulating substrate 2, at least one slit 3 cut from a first end to a part near a second end is formed, At least two strip parts 5, 6 are formed in a shape connected at a coupling portion 4 of the second end. A conductor pattern 8 is formed on one side of the strip parts 5, 6 of the insulating substrate 2. Light emitting diodes 10 are joined so as to be linearly aligned along each strip part 5, 6 on the conductor pattern 8, and bent at the coupling portion 4 of the strip parts 5, 6 to linearly extend each strip part 5 and obtain an elongated body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flexible wiring board for an illuminating device suitable for being applied to lighting (automotive illuminating device) for automobile ceiling lighting, vehicle body rear garnish, door inner side, and vehicle body side sill.

  As a conventional automotive lighting device, for example, a meter lighting device using a low-pressure discharge lamp has been known, but in order to solve the disadvantages of the discharge lamp, a rigid wiring board made of a bakelite plate or the like is used. A plurality of light emitting diode pellets are arranged in series at equal intervals, and several pellets are connected in series, and these sets are connected in parallel, and lead wires are soldered to terminal portions formed at one end of the wiring board. I started to use what I pulled out. However, since the wiring board is made of a rigid material, it cannot be inserted unless it is the same shape as the housing part in the case. If the width is about 2 mm, the terminal part is narrow and soldering is not easy, and the connection strength with the lead wire is also high. In particular, in the case of a movable body, a force is repeatedly applied to the connecting portion, and there is a problem that this portion is easily disconnected. For these reasons, recently, a flexible wiring board (FPC) that is easy to handle is used instead of a rigid wiring board. For example, when a large number of light emitting diode pellets are provided on the FPC, the light emitting diode pellets are bonded to the conductor pattern formed on the insulating substrate surface via a conductive adhesive. And as a display indicator of the meter as described above, the FPC is bent and accommodated in an elongated case. This bending is performed by bending the weakest part even though the FPC is flexible. For this reason, there is no peeling, cracking or chipping in the portion where the bending stress is applied to the conductive pattern bonded to the FPC by thermocompression bonding or an adhesive or the light emitting diode pellet bonded to the conductive pattern via the conductive adhesive. However, the light emitting diode does not emit light, cannot emit a predetermined light, or the characteristics are not deteriorated.

Therefore, a device has been developed that is easy to bend when accommodated in a case or the like and that can flexibly cope with movement. This includes an FPC insulating substrate, a conductor pattern formed on the FPC insulating substrate, a plurality of light emitting diode pellets bonded to the conductor pattern via a conductive adhesive, and a conductor on the insulating substrate surface. The FPC is easily bent and can be easily accommodated in a small case, and the FPC conductor pattern, electronic component, It is possible to reduce the application of undesired stress to the adhesive and the like, and to prevent the occurrence of defects such as peeling, cracking and chipping in these portions (see Patent Document 1).
JP-A-6-314858 (page 3, FIG. 2)

  The conventional light emitting diode array for the lighting device has only a pinpointed portion formed by forming a “scheduled portion” (recessed portion), and cannot be applied if the type or blade of the automobile is different. It was a thing. For example, when a specific part of an automobile to which such a light-emitting diode array is applied has a design surface such as a thin or curved surface, the FPC is designed in a shape that matches the design surface. In other words, when the design surfaces are different, it is necessary to prepare FPCs having different shapes. For this reason, there has been a problem of increasing the design cost of FPC, jigs such as masks at the time of manufacture, and further increasing the types of parts of automobile manufacturers and parts manufacturers, thereby raising the part number management cost.

  Then, an object of this invention is to provide the flexible wiring board for lighting devices which enabled the extra length absorption by bending and a cutting | disconnection, and multi-product number correspondence cheaply.

  In order to achieve the above-mentioned object, the present invention forms a slit cut from at least one end to the vicinity of the other end in a flexible insulating substrate, and at least two strip portions are connected by a connecting portion at the other end. A conductive pattern is formed on one side of the band-shaped portion of the insulating substrate, and light-emitting diodes are joined on the conductor pattern so as to be aligned in a straight line along the respective band-shaped portions; Each band-like portion can be elongated in a straight line by being bent at the connecting portion of the portions.

  According to the present invention, at least one belt-like portion is formed in a flexible insulating substrate so that at least two strip portions are connected to each other at the other end connecting portion. A conductor pattern is formed on one side of the band-shaped portion of the insulating substrate, light emitting diodes are joined on the conductor pattern so as to be aligned in a straight line along the respective band-shaped portions, and bent at the connecting portion of the band-shaped portions. As a result, each belt-like portion can be elongated in a straight line, so that the mounting surface of the light emitting diode (LED) can be aligned by bending and stretching at the connecting portion, and an expensive double-sided flexible wiring board (FPC) ), And can be used for many product numbers at low cost. In addition, the FPC can be bent or the band-shaped portion can be cut to adjust the length, so that various lighting devices can be handled. Furthermore, the FPC can be bent to absorb the extra length, and the imposition of the FPC can be improved by using the bending and stretching of the connecting portion described above. Furthermore, at the time of manufacturing, when the connecting portion is set to 2 or more and the belt-like portion is arranged in a zigzag manner, reflow soldering can be performed as a means for forming a long conductor pattern, so that a large reflow furnace and mounter are not required, thereby reducing costs. Can do.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a flexible printed circuit board (FPC) 1 according to the first embodiment, in which a slit 3 is formed by cutting from one end of a flexible insulating substrate 2 to the vicinity of the other end (from left to right in the drawing). Thus, the connecting portion 4 is formed on the other end side, and the two strip-like portions 5 and 6 connected by the connecting portion 4 are provided. A connector mounting portion 7 is provided at one end of the belt-like portion 5. Each of the strip-like portions 5 and 6 is provided with a conductor pattern 8, and this conductor pattern 8 makes a U-turn at the connecting portion 4. A light emitting diode (LED) 10 is bonded to the conductor pattern 8 via a conductive adhesive 9. The LED 10 is provided with electrodes 10B and 10C, and the electrodes 10B and 10C are electrically connected to the conductive pattern 8 (see FIG. 2).

  FIG. 3 is an enlarged view of the connecting portion 4, in which the insulating substrate 2 is folded in half from the extension line X of the slit 3, and the back surfaces of the band-like portions 5, 6 are overlapped, and then vertically from the end of the slit 3. The belt-like portion 6 is folded back along the line Y drawn downward. When bent in this way, as shown in FIG. 4, the band-like portions 5 and 6 extend linearly. At this time, if the connecting portion 4 is set up vertically with respect to the strip portions 5 and 6, the LED 10 is not hidden by the connecting portion 4 as shown in FIG.

  The LEDs 10 mounted on the belt-like portions 5 and 6 are provided at regular intervals, and are provided at regular intervals when bent and extended. In this embodiment, a plurality of LED units 10A each including three LEDs 10 are provided. In FIG. 6, although this LED unit 10A is provided, the part which can be cut | disconnected is shown. That is, if it is between several LED units 10A, even if it cut | disconnects, wiring can be used to the cut | disconnected part, and it can respond to arbitrary illumination length. In addition, an arbitrary emission color can be selected by changing the lighting color of the LED 10.

  FIG. 7 shows a second embodiment in which the FPC 1 is applied to a trim of an automobile door. The mounting portion of the LED 10 constituting the foot lighting (white) is provided in the belt-shaped portion 5 and the connecting portion 4 is interposed therebetween. There is another belt-like portion 6, and there are belt-like portions 61 to 63 via the connecting portion 4, and courtesy illumination (red) for notifying the following vehicle of the door opening is configured on the same circuit. In order to cope with the difference in the size of the door and the lighting part due to the difference in vehicle type and grade, the extra length can be absorbed by bending, stretching, cutting and bending at each connecting portion 4.

The top view which shows 1st Embodiment. Sectional drawing of a LED attachment part. The enlarged view of a connection part. The top view bent and extended by the connection part. The top view of the state which raised the connection part. The top view which shows the part which can be cut | disconnected. The top view which shows 2nd Embodiment.

Explanation of symbols

1 FPC
2 Insulating substrate 3 Slit 4 Connecting portion 5, 6 Strip portion 8 Conductor pattern 10 LED

Claims (4)

Forming a slit cut from at least one end to the vicinity of the other end in a flexible insulating substrate to form a shape in which at least two belt-like portions are connected by a connecting portion at the other end;
A conductor pattern is formed on one side of the band-shaped portion of this insulating substrate,
The light emitting diodes are joined on the conductor pattern so as to be aligned in a straight line along the respective belt-like portions,
A flexible wiring board for an illuminating device, wherein each belt-like portion can be elongated in a straight line by being bent at a connecting portion of the belt-like portion.   The flexible wiring board for lighting device according to claim 1, wherein the connecting portions are alternately formed on the left and right sides, and three or more belt-like portions are arranged in a zigzag shape.   The flexible wiring board for an illumination device according to claim 1 or 2, wherein the light emitting diodes are arranged at equal intervals.   4. The flexible wiring board for an illumination device according to claim 1, wherein a plurality of LED units each including two or more sets of the light emitting diodes are provided. 5.

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