Sony Corporation

Sony Disc & Digital Solutions Inc.

Eijiro Kikuno

Sohmei Endoh

Takeshi Gouko

Takahiro Igari

Noriyuki Saito

Shinji Minegishi

Takeshi Yamasaki

Toshiyuki Kashiwagi

Yuji Akiyama

Tomomi Yukumoto

A recording method whereby an inorganic resist made of an incomplete oxide of a transition metal is formed as a film onto a substrate and a latent image corresponding to pits is formed onto the inorganic resist by exposure. The exposure is performed by a laser beam whose intensity has been modulated by a pulse signal whose pulse height decreases in a rear portion in a length direction of the pit, thereby forming a format of a track pitch smaller than a recording beam diameter (track pitch/exposure beam diameter=0.333 to 0.833).

Systems and methods for forming a master disk utilizing variation in an applied signal power for forming uniform pits

High density optical disc having small track pitch

Method for making an optical disc having a track pitch smaller than a recording beam diameter

A method of production of a multilayer optical recording medium capable of avoiding difficulties in separating a stamper and forming a semi-transparent film on a thin flexible film and a production method thereof, comprising steps of forming a first optical recording layer on a substrate formed with a pattern of irregularities for a first optical recording layer on a surface thereof, forming a transfer substrate comprised of an acrylic resin formed with a pattern of irregularities on a surface thereof, forming a second optical recording layer on the pattern of irregularities of the transfer substrate, adhering a flexible film at the upper portion of the second optical recording layer by an adhesive layer, separating the second optical recording layer and the transfer substrate at their boundary to transfer the second optical recording layer to the flexible film, and bonding together the first optical recording layer and the second optical recording layer with them facing each other.

Method of production of multilayer optical recording medium

Growing community of inventors

Shizuoka, Japan

Eijiro Kikuno