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The disclosed holographic disk design allows for reduction in the height of a bar code scanner optical cavity without a reduction in function.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
95% of the total text.
Page 1 of 1
Holographic Disk Design for Reduced Bar Code Scanner Height
The disclosed holographic disk design allows for reduction in the height of a
bar code scanner optical cavity without a reduction in function.
Supermarket bar code scanners require omni-directional "Bar-X" scan
patterns so that bar codes passing over the scanner window in random
orientations can be read. The omni-directional pattern is created when individual
holographic facets direct the scanning beam into a post-disk mirror array.
Several sets of mirrors exist in the array, with each set creating scan lines that
exit the scanner window with a different orientation.
The volume required for the mirror array limits efforts to reduce the volume of
the overall scanner package. To avoid mechanical interferences between sets of
mirrors, a certain volume directly above the disk must be kept free of mirrors.
With existing holographic disks, the light collection area of each holographic
facet is distributed in an annular sector that extends from the inner radius to the
outer radius of the disk. The disclosed holographic disk designs use inner and
outer collection zones, with some facets collecting from the outer zone and other
facets collecting from the inner zone.
The figure shows an existing holographic disk and the disclosed holographic
disk. With the light collection function distributed into inner and outer zones,
post-disk mirrors can be placed closer to the disk without creating interferences