Patent ID: 7839547
Filing Date: 2010-11-23
Classification: G03H,G07D

Abstract:
1. An inspection apparatus which inspects a medium to be inspected on which a hologram is attached, the apparatus comprising: a light source unit comprising a spotlight illuminator which irradiates spotlight illumination light onto the hologram of the medium from a predetermined direction at which diffraction light from the hologram is obtained, and a transmitting light illuminator which irradiates illumination light to transmit through the medium, onto a region larger than the size of the hologram to include the hologram; a first light receiving member which receives the diffraction light from the hologram; a second light receiving member which receives the transmitted part of illumination light irradiated onto the hologram, having passed through the medium; and an identification processing unit which identifies authenticity of the hologram from the diffraction light received by the first light receiving member and identifies a defect of the hologram from the transmitted light received by the second light receiving member, wherein the transmitting light illuminator is configured to irradiate illumination light onto the medium in a direction inclined to the medium, and the second light receiving member is arranged to receive the transmitted illumination light in a direction perpendicular to the medium.