OPTICAL MEMBER AND LIGHTING DEVICE HAVING THE SAME

摘要

An optical member ( 3 ) has an entrance bottom surface ( 6 ) opposed to LED chips ( 1 ) and the entrance bottom surface ( 6 ) is configured to receive light from the LED chips ( 1 ), an exit top surface ( 7 ) opposite to the entrance bottom surface ( 6 ) and the exit top surface ( 7 ) is configured to emit the light outside the optical member( 3 ), and an outer peripheral side surface ( 8 ) disposed between the entrance bottom surface ( 6 ) and the exit top surface ( 7 ). The outer peripheral side surface ( 8 ) has a plurality of circumferentially extending grooves ( 9 ) each having a V-shaped sectional configuration. The grooves ( 9 ) are set at an angle at which the entered light can be totally reflected inwardly in the optical member ( 3 ).