A high-reliability optical reading apparatus for reading a latent image mark capable of accurately reading the code information of a latent image mark. The optical reading apparatus comprises a light-projecting light member for projecting on a surface of the latent image mark, the light having a wavelength...http://www.google.es/patents/US5668363?utm_source=gb-gplus-sharePatente US5668363 - Optical reading apparatus for reading latent image mark
Optical reading apparatus for reading latent image mark
