Information writing device

Abstract

An information writing device in which the information can be written accurately efficiently and in which variable formats of the disc-shaped recording mediums can be coped with without the necessity of providing master discs from one format of the disc-shaped recording medium to another. A grating interferometer clock scale system is formed by a clock pattern dischaving a clock trackcarrying an optically readable clock patternand an optical headfor optically reading out the clock pattern. Clock signals are generated in a clock generator, to which is transmitted, via an optical fiber, the interference light obtained as an optical output obtained in turn by optically reading out the clock patternby the optical head, based on electrical signals obtained on photoelectrically transducing the optical output. The servo information synchronized with the clock signals is generated by a servo information generating part