To realize a polarization surface light source device generating linear polarization, based on concurrent use of polarizing separation by a polarization effect and polarizing elimination due to the scattering light.
Incident light from an end face of a light guide plate 11, while scattered, is propagated to the front in the light guide plate, the light goes out obliquely from an obverse/reverse of the light guide plate. Outgoing light from the reverse of the light guide plate is reflected by a light reflecting layer 13, to be again incident on the light guide plate. Outgoing light from the surface of the light guide plate is diagonally incident on a polarizing separation layer 20, by a polarization effect, relating to the main permeation of P wave (parallel components with vibrating surface of field vector in parallel to incident surface), most of the S wave (Senkrecht component with vibrating surface of field vector vertical to the incident surface) is reflected. The S wave is reflected by a light scattering layer 31 simultaneously losing polarization, to be reflected by the reflecting layer and again incident on the polarizing separation layer 20. The P wave easily permeates the polarizing separation layer, the S wave is easily reflected. Thus by repeating permeation and reflection of linear polarization in the polarizing separation layer, mainly therefrom, the P wave is made to go out diagonally, a propagation direction is controlled by a light deflecting layer.
IZUHARA JUN
HATTORI YUKITOSHI
SAKAI TAKEYA
Next Patent: LIGHTING SYSTEM FOR HIGH CEILING