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    • 6. 发明专利
    • INFORMATION RECORDING DEVICE
    • JPS6063741A
    • 1985-04-12
    • JP17163084
    • 1984-08-20
    • HITACHI LTD
    • MAEDA TAKESHIKOUMOTO MASATOYONEZAWA SEIJI
    • G11B7/00G11B7/004G11B7/0045G11B7/005G11B7/085G11B7/095
    • PURPOSE:To accurately perform tracking and retrieval of information grooves at the time of reproduction, by producing the information grooves by irradiating an irradiation beam for working modulated in intensity upon a recording medium and continuously or discontinuously changing the frequency of standard signals for detecting synchronism. CONSTITUTION:A signal from an information source 13 is modulated by a modulating means 14 and, after the signal is added to a signal which is obtained by modulating a signal from a synchronism detecting signal generating means 18 by means of another modulating means 17, the added signal is binary-modulated. At optical beam 8 generated from an optical beam source 6 is modulated by an optical beam intensity modulating means 7 and the intensity-modulated optical beam 9 is converged on a photosensitive material 3 on a rotating disk 1 by means of an optical deflecting means 10 of a galvano-mirror, AO deflector, EO deflector, etc., and a light condensing optical system 11 and a microspot 5 is formed. An information groove 4 is recorded by the microspot 5 thus formed. When the recording is made, the output of the generating means 18 is inputted into the driving means 19 of the optical deflecting means 10 and the means 10 is driven, so that the optical beam can be oscillated in the radial direction of the disk.