To provide an optical scanner including a replaceable optics engine.

The optical scanner is provided with a scanner housing including a scanner housing aperture, pattern mirrors in the housing, and an optics engine. The optics engine includes an engine housing which can be inserted into the scanner housing aperture; a mirrored spinner 16 in the engine housing for directing a laser beam at the pattern mirrors and for receiving light reflected from an item from the pattern mirrors; a motor 26 in the engine housing for rotating the mirrored spinner; a laser 12 in the engine housing for producing the laser beam; and a collector 20 in the engine housing between the laser and the mirrored spinner, including an aperture through which the laser beam passes, wherein the collector receives the light reflected from the item from the mirrored spinner.