Zoom unit, a light engine having the zoom unit and an illuminating apparatus

摘要

A zoom unit (1) of a light engine (5), comprising at least one lens (2), at least one first reflector (3) and at least one second reflector (4), other at least one lens (2) receives a collimated beam (LI) from a light source unit (6) of the light engine (5), the collimated beam (LI) being incident on the first reflector (3) after being converged by the lens (2), and being incident on the second reflector (4) after being reflected by the first reflector (3), to produce an output beam (L4) with its beam angle changed.

主权项

1. An illuminating apparatus comprising: a light source capable of emitting a collimated beam of light;
a converging lens positioned to directly receive the collimated beam of light emitted from the light source, the converging lens capable of converging light entering the converging lens from the light source, the converging lens being a donut lens that is rotationally symmetric about a central axis; a first reflector positioned to directly receive, on a reflecting surface thereof, the converging light emitted from the converging lens and shaped so as to change a propagation direction of light striking the first reflector substantially toward the central axis, the first reflector being ring-shaped that is rotationally symmetric about the central axis, the reflecting surface of the first reflector being concave toward the converging lens and being formed as a faceted surface; a second reflector positioned on the central axis to directly receive, on an outer reflecting surface thereof, the light reflected by the first reflector and shaped so as to change a propagation direction of light striking the second reflector to be directed away from the central axis, the second reflector being positioned offset from a light path between the converging lens and the first reflector, the outer reflecting surface of the second reflector having a conically shaped outer surface with a larger end thereof being closer to the converging lens than a smaller end thereof, and a third reflector positioned to directly receive, on a reflecting surface thereof, the light reflected by the second reflector and shaped so as to change a propagation direction of light striking the third reflector to converge at a converging area spaced from the third reflector substantially on the central axis.