Importance

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Abstract

A bar code scanner includes a semiconductor laser device for emitting a light beam, a hologram disc on which a grating is formed, the hologram disc rotating around a predetermined axis, an incident optical system provided for perpendicularly projecting the light beam emitted from the light source onto the grating formed on the hologram member, a first optical system which projects the light beam passing through the grating formed on the hologram member onto the medium, and a second optical system for guiding the light beam reflected by the medium to a detector. The first optical system includes a plurality of mirrors arranged under the hologram disc so as to surround the axis of rotation of the disc so that each of the mirrors reflects light diffracted by the hologram disc and thereby forms a scanning line.

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First Claim