Light emitting device, surface light source device, display...

Details Light emitting device, surface light source device, display... Light emitting device, surface light source device, display...

2007-01-24

2009-11-24

Choi, Jacob Y (Department: 2885)

Illumination

Light source and modifier

Including translucent or transparent modifier

C362S309000, C362S336000, C362S326000, C362S612000

Reexamination Certificate

active

07621657

ABSTRACT:
Light from light emitting element enters into a flux control member through a recess on an inner face of the light flux control member, being emitted from an emission control face (outer face). At least so far as light falls within a half-intensity-angular-range, the light satisfies Condition 1 ((θ5/θ1)>1 except for light in the vicinity of a normal direction of the emission control face) and Condition 2 (Value of θ5/θ1>1 gets smaller gradually with increasing of θ1). It is noted that θ1, θ5 are angles made at being inner-incident to the emission control face and at being emitting from the same, respectively. The emission control face has a planar outline shape which is anisotropic around optical axis L, thereby causing value of θ5 /θ1 to have a change depending on direction angle φ around optical axis L, with the result that highly uniform light is supplied to a required anisotropic irradiation range.

REFERENCES:
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patent: 7348723 (2008-03-01), Yamaguchi et al.
patent: 7445370 (2008-11-01), Ohkawa
patent: 2005/0093430 (2005-05-01), Ibbetson et al.
patent: 2008/0137331 (2008-06-01), Kaneko et al.
patent: 07-191311 (1995-07-01), None

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