JP2007335345A - Mounting structure of automobile led lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lessen the number of mounting processes and enable mounting irrespective of a mounting place or a shape of a mounting face, in case LEDs are used as an automobile illumination lamp. <P>SOLUTION: White-color LEDs or/and blue-color LEDs by three to four pieces are connected in series, a piece of lamp unit 20 is provided with a driving voltage set at 9 V or more and 12 V or less, and the lamp unit is connected with a power source line 11 of the maximum voltage of 12 V. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a mounting structure for an LED lamp for an automobile, and more specifically, the LED lamp is attached to a flexible flat cable that is routed to an automobile and is supplied with a power of a maximum voltage of 12 V from a battery and used for in-vehicle lighting or the like. Is.

In recent years, LEDs (light-emitting diodes) with low power consumption and long life have been widely used in various fields of lighting, and LEDs are used in instruments, indoor interior lamps, and the like in automobiles.
The power supply voltage used for lighting in an automobile is typically 12V. On the other hand, when a white LED is used as an illumination lamp, the rated voltage of the white LED is 3V to 3.5V. For this reason, a plurality of white LEDs are connected in series and a resistor is connected to the LEDs, and even if a voltage of 12 V is applied to the LEDs, adjustment is made so that no overvoltage or overcurrent occurs.
As a method of connecting a plurality of LEDs and a light amount adjusting resistor in series, for example, in Japanese Patent No. 2650236 (Patent Document 1), an LED chip 2 and a resistor on a strip-like insulating substrate 1 as shown in FIG. 3, the structure which provided the electrode 4 and connected the LED chip 2 and the resistor 3 in series is disclosed.

Japanese Patent No. 2650236

  However, in Patent Document 1, when the space for the mounting place is small, the board cannot be mounted depending on the size of the board, or the board cannot be mounted when the mounting surface is curved. Therefore, there may be restrictions on the mounting location and the shape of the mounting surface. In addition, since a large number of resistors and LEDs are mounted on a substrate in the manufacture of an automotive LED lamp, the number of mounting steps is increased, and there is room for improvement.

  The present invention has been made in view of the above problems, and can be used without attaching resistors to the respective LED lamps for automobiles, so that the LED lamps for automobiles can be mounted regardless of the mounting location and the shape of the mounting surface. It is an object to enable and mount an automotive LED lamp with a small number of mounting steps.

  In order to solve the above-described problems, the present invention provides a single lamp unit in which a total of 3 to 4 white LEDs and / or blue LEDs are connected in series, and a driving voltage is set to 9 V or more and 12 V or less. There is provided an automobile LED lamp mounting structure in which the unit is connected to a power supply line having a maximum voltage of 12V.

Since the power supply voltage used for lighting in the automobile is generally about 12V, a maximum voltage of 12V is applied to the lamp unit from the power supply line. As described above, since the rated voltage of white LED or blue LED is 3V to 3.5V, 3 to 4 LEDs are connected in series to form a lamp unit, and the driving voltage of the lamp unit is set to 9V to 12V. When the voltage is set to about, even when a voltage of 12 V is applied to the lamp unit, the LED does not become overcurrent or overvoltage, and the LED can be made to emit light without separately connecting a resistor to the LED.
As described above, since the plurality of LEDs are formed as one lamp unit, the lamp unit can be directly connected to the power supply line without interposing a resistor, thereby reducing the mounting process. be able to.

  Further, since the lamp unit used in the present invention does not require the substrate used in Patent Document 1, the lamp unit can be reduced in size, and the mounting location of the lamp unit can be selected without being restricted by the size of the substrate. be able to. Further, since the lamp unit is directly connected to the power supply line, the lamp unit can be mounted by arranging the power supply line along the mounting surface even if the shape of the mounting surface is a curved surface or the like.

  The LED used in the lamp unit may be either a white LED or a blue LED. Since both the white LED and the blue LED have a rated voltage of 3 V to 3.5 V, the lamp unit can be used without changing the design of the driving voltage or the like regardless of which LED is used.

The lamp unit has three white LEDs or three blue LEDs connected in series, and the power supply side lead of the lamp unit is directly connected to the power supply line without a resistor, while the ground side lead of the lamp unit is connected. Connected to the ground wire.
As described above, since the driving voltage of the lamp unit is set to about 9V to 12V, even if power is supplied from the battery with the maximum voltage of 12V mounted on the automobile, it is adjusted so as not to become overvoltage and overcurrent. Therefore, the power supply side lead of the lamp unit can be connected to the power supply line without a resistor.

A rectifying resistor or a constant current diode is connected in series between the power supply side LED and the power supply side lead among the LEDs connected in series, or between the ground side LED and the ground side lead. Also good.
As described above, if a rectifying resistor or a constant current diode is attached in advance in the lamp unit, the drive voltage of the lamp unit can be made substantially the same as the voltage applied from the power supply line, and the current flowing through the LED can be adjusted. Thus, by adjusting the current or voltage flowing through the LED, the LED can emit light efficiently.
Moreover, since there are individual differences in the forward voltage of the LED, the resistance value is different for each lamp unit. Therefore, by connecting the most appropriate rectifying resistor to each lamp unit, the LED can be efficiently emitted for each lamp unit. Further, when a constant current is supplied to the LED using the constant current diode, it is possible to efficiently emit light with the brightness of each LED being constant.

  A conductor of a flexible flat cable is used as the power line, and in the flat cable, a power circuit conductor and a ground circuit conductor serving as the power line are wired in parallel at a predetermined interval, and the power circuit conductor and The lamp unit is disposed between a ground circuit conductor and the power supply side lead and the ground side lead on both sides of the lamp unit are connected and fixed to the power circuit conductor and the ground circuit conductor. Is preferred.

When the flexible flat cable is used, the flexible flat cable can be routed along a curved surface, and the selection range of the attachment position of the lamp unit can be expanded.
The flexible flat harness has a configuration in which both front and back surfaces of a conductor that is wired in parallel with a required interval are laminated with an insulating film, so that a power circuit conductor and a ground circuit conductor that are wired in parallel are connected to each other. Place the lamp unit between them, peel off the insulating film on the surface of the conductor to be connected to the power supply side lead and the ground side lead of the lamp unit, and bond the exposed conductor and the lead using a conductive adhesive or the like The lamp unit can be easily mounted on a flexible flat cable simply by fixing.

It is preferable that a plurality of the lamp units be attached between the power circuit conductor and the earth circuit conductor arranged in parallel in the flexible flat cable at a predetermined interval in the wiring direction of these conductors.
That is, when the illuminance is insufficient with one lamp unit, the illuminance can be easily ensured by attaching a plurality of lamp units to the flexible flat cable.

  As described above, it is preferable to mount the lamp unit on the flexible flat cable. However, the power supply side circuit and the grounding circuit are configured by general electric wires, and the two electric wires are wired in parallel to provide the power supply side lead of the lamp unit. The ground lead may be connected.

As described above, according to the present invention, by setting the driving voltage of the lamp unit to about 9V to 12V, the LED does not become overcurrent or overvoltage even when a voltage of 12V is applied to the lamp unit. The LED can be made to emit light without separately connecting a resistor.
In addition, since a plurality of LEDs are formed as one lamp unit without using a substrate and the lamp unit is miniaturized, the mounting location of the lamp unit can be selected without being restricted by the size of the substrate. . Further, by matching the shape of the power supply line with the shape of the mounting surface, the lamp unit can be mounted regardless of the shape of the mounting surface. That is, the automotive LED lamp can be mounted regardless of the mounting location and the shape of the mounting surface.

Hereinafter, an embodiment in which an LED lamp of the present invention is attached to an automobile will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention. 1 is a perspective view of a flexible flat cable 10 to which a lamp unit 20 is attached, FIG. 2 is a sectional view, and FIG. 3 is a circuit diagram.

The flexible flat cable 10 is routed along the roof of the automobile, and an LED lamp is attached for indoor lighting. In addition, it is good also as a lamp | ramp for illumination of various apparatuses which wired in the instrument panel and mounted | worn with the LED lamp in the instrument panel.
A plurality of lamp units 20 are attached to the flexible flat cable 10 at intervals in the wiring direction.

  The flexible flat cable 10 is formed by wiring two conductors 11 (11A, 11B) in parallel with an interval between them, and laminating the front and back surfaces of these conductors 11 with an insulating film 12. The one conductor 11A is a power circuit conductor (power line) connected to a battery 30 (shown in FIG. 3) having a maximum voltage of 12 V mounted on the automobile. The other conductor 11B is grounded to serve as a ground circuit conductor.

The lamp units 20 are arranged so as to be bridged between the power circuit conductor 11A and the ground circuit conductor 11B. At the locations where these lamp units 20 are attached, the insulating film is peeled off to expose the power circuit conductor 11A and the ground circuit conductor 11B.
A pair of power supply side leads 21A and a ground side lead 21B are mounted on the exposed power supply circuit conductor 11A and ground circuit conductor 11B so as to protrude from both sides of the lower surface of the mounting plate of the lamp unit 20, respectively. The connection is fixed through.

FIG. 3A shows each lamp unit circuit, and FIG. 3B shows three lamp unit 20 (20-1, 20-2, 20-3) circuits.
Each lamp unit 20 has a configuration in which three white LEDs 22A to 22C are connected in series, and a rectifying resistor 23 is connected in series between the power supply side LED 22A and the power supply side lead 21A.
The rated voltage of the white LEDs 22A to 22C is 3.5V, and the driving voltage of the three white LEDs 22 connected in series is 10.5V. Since the power supply voltage from the battery 30 is 12V, the resistance value is set so that 1.5V can be applied to the rectifying resistor 23.

  When three lamp units 20 are juxtaposed and connected to the power circuit conductor 11A and the ground circuit conductor 11B of the flexible flat cable 10, the three lamp units 20-1, 20-2, 20-3 are connected. Are connected in parallel to the power supply, and the voltage value of the power supply voltage is applied to each lamp unit 20.

  In FIG. 3, the rectifying resistor 23 is connected between the LED 22A on the power source side of the LED 22 and the power source side lead 21A, but a rectifying resistor is connected between the LED 22C on the ground side and the ground side lead 21B. May be.

According to the above configuration, since the lamp unit 20 does not use a substrate and is downsized, the mounting location of the lamp unit 20 is not limited by the size of the substrate. Furthermore, the lamp unit 20 can be mounted regardless of the shape of the flexible flat cable 10 by matching the shape of the flexible flat cable 10 with the shape of the mounting surface.
Further, since the plurality of white LEDs 22 and the rectifying resistor 23 are formed as one lamp unit and the lamp unit is directly connected to the flexible flat cable 10 and attached, the attachment process can be reduced and the attachment can be performed. Easy.
Further, by connecting the rectifying resistor 23, the drive voltage of the lamp unit 20 can be made substantially the same as the applied voltage from the battery 30, and the current flowing through the white LED 22 can be adjusted, and the white LED 22 can emit light efficiently. .

4A to 4C show a modification of the first embodiment of the present invention.
FIG. 4A differs from the first embodiment in that the rectifying resistor 23 is not connected, and the lamp unit 20 is configured by connecting three blue LEDs 22 in series as LEDs. Since the driving voltage of the lamp unit 20 is set to about 9 to 12V, it is not necessary to separately connect the resistor 23 to the blue LED 22 even when the maximum voltage of 12V is applied to the lamp unit 20, so that the configuration of the lamp unit 20 is achieved. Can be simple.

  In FIG. 4B, four blue LEDs 22 are connected in series. Even when four blue LEDs 22 are connected, since the drive voltage of the lamp unit 20 is set to 9 to 12 V, it is not necessary to connect the rectifying resistor 23 and the configuration of the lamp unit 20 can be simplified.

FIG. 4C is different from the first embodiment in that four blue LEDs 22 are connected in series. The lamp units 20-1, 20-2, and 20-3 are configured by interposing a rectifying resistor 23 between the power supply side LED 22A and the power supply side lead 21A.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 5 shows a second embodiment of the present invention. Each lamp unit 20 is different from the first embodiment in that a constant current diode 24 is incorporated in advance in place of the rectifying resistor 23.
The constant current diode 24 is set to allow a current closest to the rated current of the white LED 22 to flow.
Therefore, the drive voltage of the lamp unit 20 can be made substantially the same as the voltage applied from the flexible flat cable 10, and the light emission can be efficiently performed with the brightness of each white LED 22 being constant. Further, by using the constant current diode 24, it is possible to prevent the white LED 22 from being damaged due to an overcurrent flowing through the white LED 22.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 6 shows a modification of the second embodiment.
The difference from the second embodiment is that four white LEDs 22 are connected. Even if four white LEDs 22 are connected, since they are configured as one lamp unit 20, mounting is easy. Further, since the driving voltage of the lamp unit 20 is set to 9 to 12 V and the constant current diode 24 is connected, the white LED 22 can emit light efficiently.
In addition, since another structure and an effect are the same as that of 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

It is a perspective view of the flexible flat cable which attached the LED lamp for motor vehicles of embodiment of this invention. It is sectional drawing of the flexible flat cable which attached the LED lamp for motor vehicles. (A) (B) is a circuit diagram of the LED lamp for motor vehicles. It is a circuit diagram which shows the modification of 1st Embodiment. It is a circuit diagram which shows 2nd Embodiment. It is a circuit diagram which shows the modification of 2nd Embodiment. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flexible flat cable 20 (20-1, 20-2, 20-3) Lamp unit 11 Conductor 11A Power supply circuit conductor 11B Ground circuit conductor 12 Insulating film 21A Power supply side lead 21B Ground side lead 22A-22C White (blue) LED
23 Rectifier resistor 24 Constant current diode 30 Battery (power supply)

Claims (5)

  A total of 3 to 4 white LEDs and / or blue LEDs are connected in series, and one lamp unit is set with a driving voltage set to 9V or more and 12V or less, and the lamp unit is connected to a power supply line having a maximum voltage of 12V. A structure for mounting an LED lamp for an automobile.   In the lamp unit, three white LEDs or three blue LEDs are connected in series, and the power supply side lead of the lamp unit is directly connected to the power supply line without a resistor, while the earth of the lamp unit is grounded. The mounting structure of the LED lamp for motor vehicles of Claim 1 which has connected the side lead to the earth wire.   A rectifying resistor or a constant current diode is connected in series between the power supply side LED and the power supply side lead among the LEDs connected in series, or between the ground side LED and the ground side lead. The mounting structure of the LED lamp for automobiles according to claim 1 or 2.   A conductor of a flexible flat cable is used as the power line, and in the flat cable, a power circuit conductor and a ground circuit conductor serving as the power line are wired in parallel at a predetermined interval, and the power circuit conductor and The lamp unit is disposed between a ground circuit conductor and a power supply side lead and a ground side lead on both sides of the lamp unit are connected and fixed to the power circuit conductor and the ground circuit conductor. The mounting structure of the LED lamp for motor vehicles of any one of Claims 1 thru | or 3.   5. The lamp unit according to claim 4, wherein a plurality of the lamp units are attached between a power circuit conductor and a ground circuit conductor arranged in parallel in the flexible flat cable at a predetermined interval in a wiring direction of the conductors. 6. Mounting structure for automotive LED lamps.

Images