Light Emitting Device

The present invention provides a light emitting device. The light emitting device has a light distribution in which a light distribution I ( , ) obtained when light emitted from a chip of the light emitting device is directly measured is not dependent on a direction and is substantially represented...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: YAMANAKA SADANORI
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:The present invention provides a light emitting device. The light emitting device has a light distribution in which a light distribution I ( , ) obtained when light emitted from a chip of the light emitting device is directly measured is not dependent on a direction and is substantially represented by I ( , )=I ( ). I ( , ) represents a light intensity distribution in a direction ( , ), represents an angle from a direction of a normal to a light extraction surface of the light emitting device (0 90°), represents a rotation angle around the normal (0 360°), and I ( ) represents a monotone decreasing function with which 0 is approached when =90° is satisfied. In the light emitting device, of a structural body constructing the chip of the light emitting device, with regard to a size of a portion of the structural body which is transparent to light emitted from a light emitting layer, a ratio (an aspect ratio) between the size in a lateral direction and the size in a thickness direction is not less than 5 and a structure having a light scattering function is provided on a surface of the light emitting device chip or in an interior of the transparent portion of the structural body.