Patent ID: 6039452
Filing Date: 2000-03-21
Classification: G01D,G02B,G02F

Abstract:
A flat light source with U-shaped configuration, comprising:a first transparent portion for use for illumination, being composed of a first substantially flat light transmission means;a second transparent portion for use as bypass light guide, being composed of a second substantially flat light transmission means, positioned substantially parallel with said first substantially flat light transmission means;a light coupling portion for use as light coupling between said first and second transparent portions, having at least one optical prism;wherein each of said first and second transparent portions forms a substantially linear cross section of a substantially U-shaped configuration;wherein said light coupling portion, being positioned near a bottom between said first and second transparent portions, forms a substantially bent cross section of said U-shaped configuration; andthereby said first transparent portion, said second transparent portion and said light coupling portion form said substantially U-shaped configuration as a whole.