Patent ID: 10451776

Abstract:
An optical device that allows the usage of an extended light source in a more compact device is provided. The optical device may be configured to collimate light of a light source (270) along an optical direction. The optical device (200) may comprise a source surface (215), a forward surface (210), a lens body (250) and a peripheral element (240). The source surface is arranged to receive light and may comprise a central portion (220) and a Fresnel portion (230). The Fresnel portion includes at least one tooth (233n) for deflecting light. The forward surface is arranged to output, along the optical direction, at least the deflected light into a collimated light. The source surface and the forward surface delimit the lens body. The peripheral element may be arranged to reflect light internally reflected at the forward surface by total inner reflection towards the optical direction to contribute to the collimated light.