Optical information reading device

An optical information reading device comprising:

• a light source that irradiates, as a reference beam, a hologram recorded in an optical recording medium;
• a reading unit that reads information from a holographic image reconstructed by the reference beam when diffracted by the hologram;
• a housing;
• a contact member that is disposed in the housing and contacts a paper on which the optical recording medium is formed;
• an open portion that is formed in the contact member, through which the optical recording medium is exposed, and towards which the reference beam is emitted;
• a first alignment mark formed at a periphery of the open portion, the first alignment mark having first mark portions that are formed by a plurality of mark portions;
• a matching unit that matches a second alignment mark, having second mark portions that are formed by a plurality of mark portions, at a periphery of the hologram on the optical recording medium with the first mark portions, wherein the second mark portions correspond to the first mark portions, and a holographic image reconstruction condition of the reference beam is satisfied when the second mark portions match the first mark portions;
• and
• a viewing portion that is positioned in the housing, the first alignment mark and the second alignment mark being visible through the viewing portion, wherein
• the housing is vertically slidable with respect to the contact member, and one of the contact member or the housing includes a switch that switches the light source ON when the housing is lowered with respect to the contact member, and
• when the housing is lowered with respect to the contact member, the housing and the contact member push against the paper.