1 December 1984 Multidirectional Holographic Scanner For Point-Of-Sale Bar-Code Symbol Reader
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A multidirectional laser beam scanning method using holographic zone plates is described. To increase the number of scanning directions, not only is a hologram disk rotated at fixed speed (col ), but a laser beam incident on the disk is reversely rotated at another speed (w2). The focus of the laser beam diffracted by the hologram disk draws multidirectional scanning lines. The number of scanning directions (n) is equal to (w1 /c02) + 1. Experimentally, the effectiveness of this method is demonstrated for nineteen scanning directions. This scan method is applied to a point-of-sale (POS) scanner to read a non-moving bar-code symbol.
Kazuro Nishi, Koichiro Kurahashi, Takahiro Kubo, "Multidirectional Holographic Scanner For Point-Of-Sale Bar-Code Symbol Reader," Optical Engineering 23(6), 236784 (1 December 1984). https://doi.org/10.1117/12.7973383 . Submission:

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