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.
Key facts
- Application
- 11/657,076Filed 24 Jan 2007
- Priority
- JP 2006-01483324 Jan 2006
- Published
- US 2008/0007966 A110 Jan 2008
- Granted
- 24 Nov 2009
- Term ends
- Not estimatedThe source records don’t support an estimate.
Classification6 codes
- G02B 19/0066
The light source comprising a LED: in the form of an LED array
- G02B 5/045
Prisms: prism arrays
- G02B 19/0028
Characterised by the optical means employed: refractive and reflective surfaces, e.g. non-imaging catadioptric systems
- G02B 19/0061
For use with a light source: the light source comprising a LED
Family
- US 2008/0007966 A1Pre-grant publication · published 10 Jan 2008
- US 7,621,657 B2This patent
From the US filing history. Foreign family members aren’t listed.