Sony Corporation

Takuya Ichikawa

Tadashi Morita

Fumio Kubono

Kunihide Fujii

Kazuhito Hori

Taro Kurita

Atsushi Koshiyama

Toshiharu Takemura

Hiroshi Takamizawa

A plurality of services are defined for one service memory field (overlap service), and a plurality of access methods, such as 'only read' and 'read/write', are set in the service memory field. When an overlap service is defined, a PIN code may be set to each service. For example, when two services &#x201c;read&#x201d; and &#x201c;read/write&#x201d; can be started corresponding to a service memory field, two PIN codes are set.

Data communication apparatus and method for managing memory in the same

Disclosed is an apparatus for producing an original plate for optical discs, which is allowed to produce original plates for a plurality of kinds of optical discs satisfying various standards. The apparatus includes a laser light generator for generating laser light; a diaphragm mechanism for limiting laser light generated by the laser light generator; and an objective lens for refracting the laser light limited by the diaphragm mechanism in such a manner that the laser light is focussed on a photosensitive layer or a surface layer formed on the original plate; wherein a spot diameter of a beam of the laser light is changed by varying a diaphragm diameter of the diaphragm mechanism.

Apparatus and method for producing original plate for optical disc

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Tokyo, Japan

Takuya Ichikawa