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Vehicular headlamp
| Details |
Inventors: Yagi, Seiichiro;
Assignee: Koito Manufacturing Co., Ltd. (Tokyo, JP)
Primary Examiner: O'Shea; Sandra
Assistant Examiner: Choi; Jacob Y.
Attorney, Agent or Firm: Osha Liang LLP
A vehicular headlamp used for a vehicle, includes an infrared light source for generating red light and infrared light, a visible light source for generating visible light whose wavelength is different from that of the red light, an optical system for emitting the red light and visible light towards a substantially same emission area in front of the vehicle and a lighting circuit for turning on the infrared light and visible light sources with the strength in order that the chromaticity in the emission area based on the red light and visible light can correspond to white light within a predetermined range in chromaticity coordinates. |
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DETAILED DESCRIPTION Therefore, it is an object of the present invention to provide a vehicular headlamp, which is capable of overcoming the above drawbacks accompanying the conventional art.
The above and other objects can be achieved by combinations described in the independent claims.
The dependent claims define further advantageous and exemplary combinations of the present invention.
According to the first aspect of the present invention, a vehicular headlamp used for a vehicle, includes an infrared light source for generating red light and infrared light, a visible light source for generating visible light, of which the wavelength is different from that of the red light, an optical system for emitting the red light and visible light towards a substantially same emission area in front of the vehicle and a lighting circuit for turning on the infrared light and visible light sources with the strength in order that the chromaticity in the emission area based on the red light and visible light can correspond to white light within a predetermined range in chromaticity coordinates.
The infrared light source may include a semiconductor infrared light emitting element for generating the red light and infrared light, and the visible light source may include a semiconductor white light emitting source for generating the white light.
The lighting circuit may turn on the infrared light and visible light sources with the strength in order that the X-coordinate of the chromaticity in the emission area can be within a range of 0.
450 to 0.
500 and the Y-coordinate thereof can be within a range of 0.
380 to 0.
440.
The lighting circuit may turn off the infrared light source, if the speed of the vehicle is lower than a predetermined level.
The vehicular lamp to which the present invention may be applied to includes, but not limited to, a regular headlamp, a fog lamp and a cornering lamp of automobiles, motorcycles, trains and the like.
The summary of the invention does not necessarily describe all necessary features of the present invention
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Light Fixtures 
