A converting device, and recording and detecting methods using the same, wherein the converting device includes a converting layer containing a variable electroconductivity material exhibiting electronic charge conduction. The variable electroconductivity material includes: (a) an electroconductivity...http://www.google.com/patents/US5373348?utm_source=gb-gplus-sharePatent US5373348 - Converting device including variable electroconductivity material, and recording and detecting method using the same
