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Semiconductor light emitting device and vehicle light

  • US 8,702,285 B2
  • Filed: 08/26/2011
  • Issued: 04/22/2014
  • Est. Priority Date: 08/27/2010
  • Status: Active Grant
First Claim
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1. A vehicle light comprising:

  • a semiconductor light emitting device configured as a light source; and

    a projection optical system configured to project an image from the light source forward to form a light distribution pattern for a headlamp on a virtual vertical screen located in front of the vehicle light, whereinthe semiconductor light emitting device includes at least one semiconductor light emitting element having a light emission surface, a first end and a second end and at least one light extracting layer deposited on the light emission surface, the light extracting layer including a wavelength conversion layer, the at least one semiconductor light emitting element being arrayed so as to be coincident with a width direction of a vehicle body, the first end being positioned at a front portion of the light source and the second end being positioned at a rear portion of the light source in a direction parallel to the light emission surface and perpendicular to the width direction,wherein the wavelength conversion layer includes phosphor particles with a density distribution having a certain gradient in the direction parallel to the light emission surface and perpendicular to the width direction,wherein the light extracting layer has an optical characteristic that changes from the first end to the second end in the direction parallel to the light emission surface and perpendicular to the width direction of the vehicle body so that the semiconductor light emitting device forms a luminance distribution with a maximum luminance at the first end and a minimum luminance at the second end, the luminance distribution being continuously decreased from the maximum luminance at the first end to the minimum luminance at the second end, andwherein light from the first end where the luminance distribution shows the maximum luminance can reach an upper end of the light distribution pattern and light from the second end where the luminance distribution shows the minimum luminance can reach a lower end of the light distribution pattern which is opposed to the upper end.

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