Emission device, surface light source device, display and...

Details Emission device, surface light source device, display and... Emission device, surface light source device, display and...

2005-09-27

2008-03-25

O'Shea, Sandra (Department: 2875)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S512000, C362S311040, C362S335000

Reexamination Certificate

active

07348723

ABSTRACT:
A display has a member irradiated by a surface light source device comprising a light diffusion member and emission device. The emission device is provided with a light flux control member having a recess and light control emission face which is configurated so as to satisfy Conditions 1 and 2 in a range at least covering a half-intensity-angular-range. Light emitting element(s) may be sealed. Condition 1 is that relation θ5/θ1>1 is satisfied except for light emitted from a light emitting element toward within an angular-neighbourhood of a standard optical axis of the emission device, and Condition 2 is that value of θ5/θ1decreases gradually according to increasing of θ1, where θ1is an emission angle of any light at being emitted from the light emitting element, and θ5is an emission angle of that light of θ1at then being emitted from the light control emission face of the light flux control member.

REFERENCES:
patent: 4609978 (1986-09-01), Hsieh et al.
patent: 6850001 (2005-02-01), Takekuma
patent: 2005/0093430 (2005-05-01), Ibbetson et al.
patent: 59-226381 (1984-12-01), None
patent: 63-6702 (1988-01-01), None
patent: 2002-49326 (2002-02-01), None

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