Other

Pioneer Electronic Corporation

Sony Corporation

Pioneer Video Corporation

Pioneer Display Products Corporation

Minemasa Ota

Kazuo Kuroda

Toshio Suzuki

Yoshiyuki Akiyama

Shinichiro Iimura

Akiyoshi Inoue

Shouji Taniguchi

Hiroshi Ogawa

Hiroyuki Ohira

Osamu Kumasaka

Osamu Matsumoto

1 An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits. The rotation of the optical recording medium is controlled by the wobbled signals detected from the groove and the position on the optical recording medium of the recording signal is detected by the pit signal detected from the pits.

Optical recording medium including a wobbled groove with address information recorded on the land region adjacent the groove

An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and/or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording/reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording/reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits. The rotation of the optical recording medium is controlled by the wobbled signals detected from the groove and the position on the optical recording medium of the recording signal is detected by the pit signal detected from the pits.

Optical recording medium, method for recording/reproducing the optical recording medium and apparatus for recording/reproducing the optical recording medium including a wobbled groove

Optical recording medium, method for recording/reproducing the optical

Optical recording and/or reproducing apparatus using wobble signals detected from a groove and pit signals detected from pits on the recording medium to control recording and/or reproducing

Optical recording medium with wobbled grooves and interconnecting pits

Optical recording medium having pits that are formed with respect to a

A method for manufacturing an optical disk having both address pits and guide grooves having accurately controlled depths and widths. Two different types of sensitive materials of different characteristics are applied to a recording original board to form inner and outer layers thereon. The inner and outer layers are exposed and partially removed independently of each other so that the depth and width of the guide grooves and address pits can be set to desired values with high accuracy.

Method for manufacturing optical disk with address and guide grooves

An apparatus for recording pits and grooves on the surface of a recording medium such as an optical disk in which the pits and grooves are formed by separate light sources, thereby providing accurate control over the dimensions of both the pits and grooves. Light beams of separate wavelengths suitable for forming the pits and grooves are passed through respective optical modulators and continuously variable beam expanders, and then combined and applied through a focusing lens to the recording medium. A beam monitor and a focus monitor receive part of the light reflected from the surface of the disk to control the focus and beam size conditions.

Optical disk recording apparatus

Growing community of inventors

Yamanashi, Japan

Minemasa Ota