Device for scanning one or more bar codes on an object in an industrial environment, comprising: a housing provided with a window for passage of one or more scanning radiation beams and of radiation induced by a bar code; one or more plate-like components on which are arranged a radiation source, a sensor sensitive to the radiation and further electronic, optical and mechanical components; a polygonal rotatable mirror for generating scan lines from the radiation beams and drive means therefor; and placing means for placing the plate-like components and the optical, mechanical and electronic components arranged thereon in the housing in fitting manner.
