Patent ID: 6375074
Filing Date: 2002-04-23
Classification: B82Y,G02B,G06K,G07F,G07G

Abstract:
A holographic laser scanner for scanning bar code symbols on objects, comprising:a housing having a light transmission aperture; a plurality of lasers disposed within said housing, for producing a plurality of laser beams; and a holographic scanning disc disposed within said housing, rotatable about a rotational axis, and supporting a plurality of holographic facets for focusing and projecting said plurality of laser beams through said light transmission aperture so as to produce a laser scanning pattern within a highly-defined 3-D scanning volume definable relative to said housing, wherein said laser scanning pattern consists of a plurality of scanning planes projected within said highly-defined 3-D scanning volume and having multiple focal regions for scanning bar code symbols presented therein, and wherein said plurality of scanning planes are projected through each said focal region and provide a plurality of scanlines each having a scanline length that is substantially confined within said highly-defined 3-D scanning volume, and along which a bar code symbol can be scanned.