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Lighting system for vehicle

A technology for lamps and vehicles, which is applied to the layout of electric lamp circuits, the use of semiconductor lamps, and electrical components. It can solve the problems of ineffective use of open circuit detection circuits and achieve the effect of light weight and miniaturization

Inactive Publication Date: 2006-08-23
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when an abnormality is judged, it cannot be judged whether the abnormality is in the range where the lamp satisfies the light distribution specification and functions normally, or whether it is an abnormality in a state that does not meet the light distribution specification, and there is a problem that the disconnection detection circuit provided on the lamp cannot be effectively used. question

Method used

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  • Lighting system for vehicle
  • Lighting system for vehicle

Examples

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Embodiment 1

[0026] Embodiments of the present invention will be described below with reference to the drawings. figure 1 This is an example in which the present invention is applied to a lamp of an automobile, for example, an example of applying the present invention to an automobile tail light TL. A circuit board 2 on which a plurality of light emitting diodes (LEDs) 21 are arranged and mounted as light emitting elements is installed in a lamp body 1 formed in a tray container shape. In addition, a lens 3 is mounted on the front opening of the lamp main body 1 to seal the circuit board 2 . The circuit board 2 is composed of a printed circuit board, and the light emitting diodes 21 are mounted on the surface of the circuit board 2 in a desired arrangement to form a light emitting circuit corresponding to the printed wiring, and constitute a light emitting part 20 that emits light when power is supplied. As the light emitting diode 21, either a discrete light emitting diode or a chip lig...

Embodiment 2

[0076] In this type of lamp, it is rare that three or more light-emitting diode rows are abnormal at the same time, and in practice, a small number of light-emitting diode rows such as one or two are often abnormal. In the description of Embodiment 1, the case where there are three rows of LEDs has been described, but in Embodiment 1, if there are multiple rows of LEDs, when it is determined that two rows of LEDs are abnormal, a problem may occur. The problem of voltage Vd room. For example, in Embodiment 1 shown in FIG. 3 , under the condition that the resistance values ​​r1=r2=r3 of the resistors R1, R2, and R3 are equal to the resistance value rb of the resistor Rb, assuming that the rows of light-emitting diodes are 9 rows The voltage characteristic of the divided voltage Vd is shown in Fig. 11(a). Judging from this, if there are many light-emitting diode columns, the voltage difference between the divided voltage Vd2 when the light-emitting diode is abnormal and the divi...

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PUM

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Abstract

The present invention provides one vehicle lamp system with one signal line connected to the lamp and the judging circuit and capable of judging abnormal lighting element number and abnormal element inside the lamp. The lamp system includes a lamp with a light emitting part comprising parallelly connected light emitting elements and a breaking detecting circuit for detecting the breaking in the light emitting elements; and a judging circuit with one signal line connected to the breaking detecting circuit for judging the abnormality of the light emitting elements. After the breaking detecting circuit outputs the potential of the broken light emitting element through the signal line, the judging circuit judges the abnormal light emitting element according to the potential of the signal line.

Description

technical field [0001] The present invention relates to a lamp using a plurality of light emitting elements as a light source, and more particularly to a vehicle lighting system having a control unit for controlling light emission of the light emitting elements. Background technique [0002] In recent years, lamps using light-emitting elements such as light-emitting diodes, which consume less power than light bulbs and have a longer life, as light sources have been put into practical use in lamps for vehicles. In such a lamp, since the luminous amount of the light-emitting element is smaller than that of the bulb, the light source is constituted by a plurality of light-emitting elements, such as Figure 8 As shown, in the lamp LP, a plurality of light-emitting diode columns L1, L2, L3 are used to connect a predetermined number of light-emitting diodes 21 in series, and the plurality of light-emitting diode columns L1, L2, L3 are connected to the power supply terminal TV and g...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B37/03B60Q11/00H05B44/00
CPCY02B20/343
Inventor 户田敦之内田秀树伴野寿纪
Owner KOITO MFG CO LTD