Light emitting and receiving device

Abstract

There is disclosed an adjustable light emitting device for selectively projecting light directionally and omnidirectionally, the device comprising a stepped surface lens having a focal point and a light source positioned substantially along an optical axis of the lens and adapted for movement along the axis between the focal point and the lens. There is also disclosed a light emitting device comprising a partially collimated light source and a lens. When light emitted by the light source passing through the lens is simultaneously projected in an arc of at least 180° and further wherein a measured intensity of the projected light within the arc is at least one half of a maximum intensity of the emitted light. Both devices may also include a light sensor, or the light sensor may be included together with the lens in a separate package for use in light sensing applications.

Dependencies are inferred from the claim text.