Sony Corporation

Yoshihiro Takemoto

Katsuhisa Aratani

Akira Kouchiyama

Shinichi Kai

Kenzo Nakagawa

Yoshiaki Kato

Fumisada Maeda

The method of the present invention includes: an exposing process in which an inorganic resist layerformed on a substrateis irradiated with recording laser light modulated by an information signal corresponding to an information signal of an information concave and convex pattern formed on an optical disc to form an exposed pattern corresponding to the information concave and convex pattern on the optical disc, and after the above process a development process in which development processing is performed on the inorganic resist layer to form a concave and convex pattern corresponding to the information concave and convex pattern of the inorganic resist layer; in the above exposing process, after a trial exposure is performed on a non-recording area of the above resist layer, the exposed portion is irradiated with evaluation laser light and a recording signal characteristic of the above resist layer is evaluated from the reflected light to determine based on the evaluation result an optimum focus position of recording laser light which is later performed; and accordingly the recording signal characteristic (jitter value) of the optical disc is predicted and evaluated in the exposing process from the recording characteristic of the exposed portion on the resist to appropriately adjust an exposure focusing position based on the evaluation result and thus, a master having an appropriate concave and convex pattern and consequently an optical disc having an excellent characteristic can be manufactured.

Method of making master for manufacturing optical disc and method of manufacturing optical disc

An electro-wetting apparatus includes a liquid having conductivity or polarity and a first electrode and a second electrode that apply voltage to the liquid. The electro-wetting apparatus also includes a dielectric layer provided between the liquid and the first electrode. The electro-wetting apparatus further includes a voltage-applying unit that applies a voltage signal between the first electrode and the second electrode, where the voltage signal is periodically changed between a first voltage of zero (0) volt or more and a second voltage of larger than the first voltage.

Electro-wetting apparatus and method of driving electro-wetting apparatus

The method of the present invention includes an exposing step in which a laser beam for recording modulated by an information signal corresponding to an information signal of an information concave and convex pattern formed on the optical disc is applied to an inorganic resist layerformed on a substrateto form an exposed pattern corresponding to the information concave and convex pattern on the optical disc, and a development step in which a concave and convex pattern corresponding to the information concave and convex pattern by the inorganic resist layer is formed. By applying a laser beam for estimation to a predetermined area on the inorganic resist layer in the exposing step to estimate recorded signal characteristics of the exposed pattern by the inorganic resist layer using reflected light of the laser beam for estimation, and controlling power of the laser beam for recording based on the estimated result, the aimed information recording on the optical disc can reliably be obtained.

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Tokyo, Japan

Yoshihiro Takemoto