AUTO-FOCUS MICROLENS HOLDER

摘要

A microlens holder for supporting at least one microlens in alignment with a light source is described. Each of the microlenses has a radius and a back focal length varying linearly with the radius. The microlens holder includes a base having at least one V-groove therein for receiving the at least one microlens, each of the V-grooves having a pair of side walls, both side wall s being tilted by an angle .theta. relative to the plane of the emitting light source. The value is defined by the relationship cos(.theta.) _ ( 1 + k)-1, where k is a positive constant factor associated with the at least one microlens. The microlens holder allows auto-focussing of the light source, independently of the exact diameter of the microlenses mounted in the holder. The optical alignment of the microlenses is made easier as well.