US 6,855,958 B2Granted

Wavelength conversion element for car use

AssigneeStanley Electric Co., Ltd.

InventorsHiroyuki Sato, Yasushi Yatsuda

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Abstract

Wavelength conversion element for car use constituted in the following manner can provide practical LED components for headlights and fog lamps. The element comprises a heat conductive base having a cavity; one or more chips fitted to the cavity bottom, and a wavelength conversion part, which converts emitted light from the chip to visible rays, arranged above the chip. The chip comprises a substrate and a light emitting part constituted by an n-type GaN film, an active layer and a p-type GaN film successively laminated on the substrate. The chip has one straight side in its plan view; an angle formed between the bottom and the side cavity surface is over 0 degree and below 90 degree. The cavity has one straight side in its opening. A ratio of the cavity opening to the totaled areas in plan view of the respective chips, is set less than three.

Claims19

Dependent claims

A wavelength conversion element for car use comprising:

a heat conductive base having a cavity having an opening and a bottom surface and a side surface forming an angle Θ2 therebetween;
at least one chip fitted to said cavity, said at least one chip for emitting light;
and
a wavelength conversion part, which converts a portion of or the total emitted light from said at least one chip, to visible rays, arranged adjacent to said at least one chip;
wherein:
said at least one chip is a light emitting semiconductor and comprises at least one active layer which emits UV or blue light;
said at least one chip has at least one straight side in its plan view;
said angle Θ2 formed between the bottom and the side surface of said cavity is more than 0° and less than 90°;
said cavity having at least one straight side at the opening;
and
a ratio of the opening area of said cavity to the total of the areas of said at least one chip in the plan view, is less than three.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/682,697Filed 9 Oct 2003
Priority: JP 2002-30193116 Oct 2002
Published: US 2004/0076016 A122 Apr 2004
Granted: 15 Feb 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H10H 20/856
Optical field-shaping means, e.g. lenses: reflecting means
H10H 20/819
Bodies: characterised by their shape, e.g. curved or truncated substrates
H10H 20/8514
Wavelength conversion means: characterised by their shape, e.g. plate or foil
H10H
Inorganic light-emitting semiconductor devices having potential barriers