To provide an information recording medium which allows the setting of intrinsic information on information recording media so as to vary the information from each other between the respective media and has excellent characteristics, such as workability to the information recording media, degree of freedom in setting of forming points and reading and reproduction characteristics of the intrinsic information and its recording and reproducing method.
Magnetic information patterns 3 are formed on at least part on a base material 11 as magnetically recordable magnetic codes consisting of a magnetic recording material having high coercive force with which writing by a magnetic head at ordinary temp. is substantially impossible and having low Curie point at which writing by the magnetic head by heating is substantially possible. Magnetic bars (magnetic code) 3a are arranged at the same and equal intervals at the time of production. As a result, the cost is reduced and the production efficiency is enhanced. Reading by using magnetic developers, etc., is non-discriminatable in a magnetization direction and is difficult. The execution of ternarized information recording with one magnetic bar (magnetic code) is made possible by using the non-magnetized magnetic bars (magnetic codes). The recording density of the medium is thus increased.
ASUKE HISASHI
CHIYOU SHIYOUTEI
ARAI YOSHIE
