Abstract: A light scanning apparatus for scanning with a reconstruction beam by shifting a hologram relative to the reconstruction beam, wherein scanning is possible for freely selected curves and/or straight lines with the reconstruction beam, depending upon the ratio, M, of the wavelength of the reconstruction beam to that of the coherent light beam which was used for generating the hologram.

Abstract: A beam scanning-type information readout device, and more particularly, a hand-carried beam scanning-type information readout device which can read information consisting of a bar-code-symbol applied to a product and which is low in cost, simply operated and very useful and has high readout accuracy. The beam scan type information readout device comprises a laser beam generator, an optical beam scanner which deflects and scans plural beams generated from the laser beam generator or deflects and scans a beam generated from the laser beam generator in plural directions, an optical beam detector which detects the beam reflected from the bar-code-symbol, and a case which functionally and physically accommodates the above-identified elements and also provides a grip portion for the operator.