OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING METHOD

摘要

PURPOSE:To enhance the flexibility of software production and to reduce the cost at the time of small-quantity production by constituting the title medium in such a manner that the change in the optical properties formed on an optical recording layer is maintained even after the treatment to make the recording layer transparent prior to reproduction. CONSTITUTION:The optical recording layer 2 of the optical recording medium which is provided with the optical recording layer 2 on a transparent substrate 1 and has further a reflecting layer 3 thereon is recorded with signals as the change in optical properties by irradiation of laser light to be used for recording. The medium is so constituted that the recording part maintains the change in the optical properties with the laser light even after the treatment to make the recording layer 2 transparent. The change in the optical properties generated at the time of recording is, therefore, maintained even after the optical recording layer 2 is made transparent. The signals can be consequently reproduced as the difference in the quantity of the reflected light between the signal recording part and the unrecording part at the time of irradiation of light of the reproduction light after the recording layer is made transparent. The need for the process for producing a costly stamper in the manufacture of CDs is thereby eliminated and the small-quantity production of the CDs and CD-ROMs of the same software is executed at the low cost with ease.