Hologram scanner
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKazuro Nishi, Koichiro Kurahashi, Tsutomu Hashimoto, Toshihiko Senoo, Shinji Yamato
Life of this patent
Estimating the term…
Abstract
A hologram scanner includes a rotatable hologram disk on which a plurality of hologram lenses are arranged circumferentially, and a light beam guide mechanism for successively shifting irradiation regions in a predetermined direction with respect to the direction of rotation of the hologram disk, to apply a light beam successively to the hologram lenses on the hologram disk, so that the scanning of a reading window with the light beam is effected in all directions with high density. The hologram scanner is employable as a bar code reading device in a POS or UPC system.
Claims10
A hologram scanner, comprising;
- a hologram disk including a plurality of hologram lenses arranged circumferentially thereon;
- means for rotating said hologram disk;
- rotating light beam guide means for successively shifting irradiation regions in a direction with respect to the direction of rotation of said hologram disk, to successively apply a light beam to said hologram lenses on said hologram disk, said rotating light beam guide means having a rotational speed different from the rotational speed of said hologram disk and a rotational direction opposite to that of said light beam guide means;
- and
- a reading window for reading an object to which said light beam is applied through said hologram lens;
- wherein a radial raster pattern having parallel scan lines is defined having a number of scan lines equal to the number of hologram lenses.
A hologram scanner, comprising;
- a hologram disk including a plurality of hologram lenses arranged circumferentially thereon;
- means for rotating said hologram disk;
- rotating light beam guide means for successively shifting irradiation regions in a direction with respect to the direction of rotation of said hologram disk, to successively apply a light beam to said hologram lenses on said hologram disk, said rotating light beam guide means having a rotational speed different from the rotational speed of said hologram disk and a rotational direction opposite to that of said light beam guide means;
- and
- a reading window for reading an object to which said light beam is applied through said hologram lens;
- wherein a radial raster pattern having parallel scan lines is defined by a variable number of scanning line directions which are a function of the ratio rotation speed of the hologram disk to that of said light beam guide means.
Dependencies are inferred from the claim text.