Abstract: An optical engine module including at least two laser sources, collimators, a light combining lens group, an aperture, a beam shaping lens group, a MEMS scanning module, and a beam expansion lens group is provided. The at least two laser sources respectively generate at least two laser beams with different wavelengths. The collimators respectively collimate the at least two laser beams to generate at least two collimated beams. The light combining lens group combines the at least two collimated beams into a combined beam. The aperture filters stray beams of the combined beam. The beam shaping lens group shapes the combined beam to generate a shaped beam with a perfect circle. The MEMS scanning module reflects the shaped beam and scans in horizontal and vertical directions to form a scanning beam. The beam expansion lens group expands the scanning beam into an expanded beam having a predetermined area.

Abstract: An air mattress includes a plurality of inflatable sacs juxtapositionally connected together in a mattress envelope; an air pump for inflating or deflating the sacs for cushioning a patient ridden thereon; a leg bending device consisting of a plurality of inflatable sacs transversely juxtapositioned at a leg section of the mattress envelope and formed as arcuate shape when inflated for cushioning a patient's bending leg; a body turning device consisting of a plurality of inflatable sacs longitudinally juxtapositioned at a right and left side of a torso section and a head section of the mattress envelope, and alternatively inflated and deflated at the right and left sides for turning the patient's body leftwardly and rightwardly; and a head lifting device consisting of a plurality of inflatable sacs gradually decreasing in height from a head portion to a patient's shoulder or neck portion for cushioning the patient's head, thereby forming an air mattress for ergonomically cushioning different body portions of