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Title:
ILLUMINATING DEVICE
Document Type and Number:
Japanese Patent JP2011249732
Kind Code:
A
Abstract:

To enhance a light emission efficiency and reduce a light radiation angle in an illuminating device having LED.

An LED chip 1 is mounted on a heat sink 7 in a case 4 for an LED illuminating device. The LED chip 1 is supplied with current through a lead frame 3 and a wire 2 from the external. The LED chip 1 is covered by sealing resin 5 having a fluorescent layer containing a needle-like fluorescent material 9, and a lens 6 for focusing light in a specific direction is disposed on the sealing resin 5. The needle-like fluorescent material 9 absorbs primary light from the LED chip 1 and emits secondary light. The aspect ratio of the needle-like fluorescent body 9 is set to 2 or more, and the major axis of the needle-like fluorescent material 9 is oriented in the thickness direction of the fluorescent layer. Accordingly, an illuminating device having a high light emission efficiency and a small light radiation angle, that is, excellent directivity is provided.


Inventors:
OKAZAKI CHOICHIRO
SHIIKI MASATOSHI
IMAMURA SHIN
KOMATSU MASAAKI
Application Number:
JP2010124335A
Publication Date:
December 08, 2011
Filing Date:
May 31, 2010
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
H01L33/50; C09K11/59; C09K11/64; C09K11/81; F21S2/00; F21Y101/02
Domestic Patent References:
JP2008291203A2008-12-04
JP2001264756A2001-09-26
JP2004279174A2004-10-07
JP2009283441A2009-12-03
JP2008291203A2008-12-04
JP2001264756A2001-09-26
JP2004279174A2004-10-07
JP2009283441A2009-12-03
Foreign References:
WO2008044759A12008-04-17
WO2008044759A12008-04-17
Attorney, Agent or Firm:
Polaire Patent Business Corporation



 
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