Semiconductor light emitting device and vehicle light
First Claim
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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Accused Products
Abstract
A vehicle light is provided which can form a light distribution pattern having a clear cut-off line. The vehicle light can include a semiconductor light emitting device as a light source. The semiconductor light emitting device can include a semiconductor light emitting element having a light emission surface thereof having a first end and a second end and at least one light extracting layer deposited on the light emission surface and including a wavelength conversion layer, and the light extracting layer includes an optical characteristic that can change from the first end to the second end in a direction parallel to the light emission surface 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.
8 Citations
13 Claims
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1. A vehicle light comprising:
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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, wherein the 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, and wherein 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. - View Dependent Claims (2, 3)
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4. A semiconductor light emitting device comprising:
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at least one semiconductor light emitting element having a light emission surface and having a first end and a second end, the at least one semiconductor light emitting element being arrayed in a certain direction, the first end being positioned at a front portion of the semiconductor light emitting element and the second end being positioned at a rear portion of the semiconductor light emitting element in a direction parallel to the light emission surface and perpendicular to the certain direction; and at least one light extracting layer deposited on the light emission surface and having a wavelength conversion layer, the wavelength conversion layer including a wavelength conversion material 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 includes 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. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification