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Lighting circuits and lamps for vehicles

A circuit, lighting technology, used in vehicle parts, electric light sources, electrical components, etc.

Active Publication Date: 2020-07-24
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the first light source 302 and the second light source 304, it is necessary to select components with similar rated currents, which poses a major constraint on design.
[0011] In addition, the combination of high beam and low beam is described here, but the same problem may arise in other combinations of light sources

Method used

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  • Lighting circuits and lamps for vehicles
  • Lighting circuits and lamps for vehicles
  • Lighting circuits and lamps for vehicles

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Embodiment Construction

[0036] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent components, components, and processes shown in the drawings are assigned the same reference numerals, and overlapping descriptions are appropriately omitted. In addition, the embodiment is not limited to the form of the invention but an example, and all the features and combinations thereof described in the embodiment are not necessarily the essence of the invention.

[0037] In this specification, the so-called "state where part A is connected to part B" includes not only the case where part A and part B are physically directly connected, but also includes the fact that part A and part B are not substantially connected via their electrical connection state. effects, or indirectly connected to other components that do not impair the role or effect played by their combination.

[0038] Similarly, the term "a state in which part C is ...

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PUM

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Abstract

The invention relates to a lighting circuit and a vehicle lamp. Provides a lighting circuit capable of lighting multiple light sources. A lighting circuit (400) for driving a first light source (302) and a second light source (304) connected in series is provided. A bypass switch (430) is arranged in parallel with the second light source (304). A constant current circuit (440) is connected in parallel to one of the first light source (302) and the second light source (304). The drive circuit (414) supplies a drive current to a series connection circuit including the first light source (302) and the second light source (304).

Description

technical field [0001] The present invention relates to lamps used in automobiles and the like. Background technique [0002] In the past, halogen lamps or HID (High Intensity Discharge) lamps were the mainstream as light sources for vehicle lamps, especially headlights. However, in recent years, instead of these lamps, LEDs (Light Emitting Diodes) or Lamps for vehicles with semiconductor light sources such as LD (semiconductor lasers). [0003] A vehicle lamp is equipped with a plurality of light sources that are individually controlled to turn on and off. For example, a light source for a low beam and a light source for a high beam may be mounted on a lamp for a vehicle. figure 1 (a) to (c) are circuit diagrams of a vehicle lamp including a plurality of light sources studied by the present inventors. In each figure, the first light source 302 corresponds to the low beam, and the second light source 304 corresponds to the high beam. [0004] figure 1 The lighting circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/345H05B45/30H05B47/10H05B44/00
CPCH05B47/10H05B45/30H05B45/10B60Q1/1407H05B45/44H05B45/46H05B45/48
Inventor 松井浩太郎野寄靖史太田真司
Owner KOITO MFG CO LTD