OPTICAL DEVICE WITH ECHELON LENS Russian patent published in 2008 - IPC G02B3/08 

FIELD: optical devices for lighting purposes.

SUBSTANCE: device consists of an echelon lens with a diffusing screen. The diffusing screen is located in the first zone, while the echelon lens is located in the second zone. By changing the shape of the incident light and/or amount of light on the optical device, illuminating the optical device, the divergence angle of the light coming out of the optical device can be set between two limiting values. The first and second zones occupy concentric surfaces of the optical device with different diameters.

EFFECT: simplification of the structure, increased light output.

66 cl, 15 dwg