Patent attributes
A variety of femtoprojector optical systems are described. The optical bodies for the systems may be made in batches by wafer-level optics. Each individual system may be made small enough to fit in a contact lens. In some designs, the optical systems include a solid transparent body with a curved primary mirror, a secondary mirror, an entrance window, an exit window, and at least one groove. The grooves function as a light trap that reduces the amount of stray light exiting the body of the optical system. The grooves may also create a snap point which allows removal of individual bodies from the wafer through controlled breakage. The designs may also include various light blocking, light-redirecting, absorbing coatings, or other types structures to reduce stray light.
