Pioneer Electronic Corporation

Pioneer Video Corporation

Pioneer Display Products Corporation

Hiroyuki Ohira

Nobuki Yamaoka

Yutaka Murakami

Kazuo Kuroda

Toshio Suzuki

Shoji Taniguchi

Akiyoshi Inoue

Minemasa Ohta

Minemasa Ota

Osamu Matsumoto

By the control information recording method, control information to control at least one of recording and reproducing operations of record information on an information record medium is recorded onto a guide track of the information record medium. The control information recording method is provided with the steps of: generating a control information timing signal one after another at an interval corresponding to a length of a control information unit equal to an N (N: predetermined integer not less than 2) multiple of a length of a record information unit of the record information; and recording the control information onto the guide track of the information record medium, on the basis of a timing corresponding to the control information timing signal.

Control information recording method and apparatus, information recording method and apparatus, and information record medium

Method and apparatus for recording information, including control

In a method for manufacturing a master disc for optical discs, patterns to be displayed on the disc are classified into a main object and a background. The background is commonly assigned as the background pattern for glittering rainbow colors by diffracted light reflected from dummy pits of diffraction gratings or a hologram. The main object is individually assigned as the main object pattern of a diffused reflection portion or mirror surface. The manufacturing method comprises one group of steps for forming the common background pattern and the other group of steps for forming the individual main object pattern in the common background pattern. A development substrate for the master disc is formed by using a mask disc in a first light-exposure of a photoresist layer thereof and by using a displaying-pattern mask in a first light-exposure of the photoresist layer. The individual main object pattern is drawn in the common background pattern of the master disc by using a laser-marking or an etching. The mask disc and displaying-pattern mask can be used repeatedly as families for the background and main object patterns so as to facilitate the replication of the optical discs.

Method for manufacturing a master disc for optical discs

An optical disk in which a pattern such as a character that can be recognized is displayed in an information recording area by display pits or grooves formed between recording tracks constructed by pit trains indicative of information signals. An apparatus for manufacturing the optical disk in which information and display modulation light beams obtained by modulating a light beam in accordance with pattern signals for information and display, respectively, are separated from each other in the disk radial direction and are simultaneously irradiated to a resist layer formed on a recording surface of a disk.

Optical disk having pattern displayed thereon and apparatus for

An optical disk having both recording surfaces on which are formed pits trains. A recognizable display pattern is formed by a group of dummy pits formed on one of the recording surfaces. An apparatus for manufacturing the optical disk in which a light beam is modulated in accordance with a dummy forming signal obtained by selectively stopping a dummy pulse, and the modulated light beam is irradiated to a resist layer formed on a recording surface of a disk to form a group of dummy pits representing a display pattern.

Optical disc having large display patterns and its manufacturing

An optical disc is provided with: a disc substrate of light transmissive type having an information record surface including an information recorded region, where pits or grooves carrying an information signal are coaxially or spirally formed, and an information not-recorded region, where the pits or grooves carrying the information signal are not formed; a light reflective layer wholly disposed on the information record surface in the information recorded region, and partially disposed on the information record surface in the information not-recorded region such that an indication pattern is formed of the partially disposed light reflective layer on the information record surface in the information not-recorded region; and a protection layer disposed on the light reflective layer and a portion of the information record surface in the information not-recorded region where the light reflective layer is not disposed.

Optical disc having indication portion

An optical recording method comprising steps of forming a groove on a surface of a recording medium, such as a recording disk, by projecting a write beam, such as a laser beam, onto the surface of the recording medium, and wobbling the write beam in a direction perpendicular to the groove to be formed, whereby the write beam is wobbled on the surface of the recording medium with a period of deviation not greater than one half of the diameter of the spot of the write beam. The groove formed by the present invention has a width greater than the diameter of the write beam and sharp edges for providing satisfactory characteristics in recording and reproducing.

Optical recording method and apparatus used to form a groove on a

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.

Growing community of inventors

Yamanashi, Japan

Hiroyuki Ohira