Matsushita Electric Industrial Co., Ltd.

Shinji Kubota

Takashi Ishida

Mamoru Shoji

Shinji Ishida

Noboru Nomura

Kiyomi Sakamoto

Tomio Yoshida

Wataru Masuda

Masatsugu Tanji

Kazutoyo Hirosawa

Noboru Yamada

Kenichi Nishiuchi

Kenji Koishi

Nobuo Akahira

Kenzo Ishibashi

A navigation system for providing different modes of navigation guidance to drivers is provided. A smart card stores user information. In a main apparatus, a parameter table storage section stores parameters which are used for controlling the outputting of navigation guidance to an entity. A control section acquires at least one parameter from the parameter table storage section based on the user information stored in the smart card, and thereafter generates information necessary for providing navigation guidance for the entity in accordance with the acquired parameter(s). A display section or an audio output section outputs various information generated by the control section.

Navigation system

A navigation system for providing different modes of navigation guidance to drivers is provided. A smart card stores user information. In a main apparatus, a parameter table storage section stores parameters which are used for controlling the outputting of navigation guidance to an entity. A control section acquires at least one parameter from the parameter table storage section based on user information stored in the smart card, and thereafter generates information necessary for providing navigation guidance for the entity in accordance with the acquired parameter(s). A display section or an audio output section outputs various information generated by the control section.

In an optical disc, a sector is sequentially formed with a first gap field, a first guard data recording field, a data recording field composed of synchronous signal and user data, a second guard data recording field, and a second gap field, wherein the length of the first and second gap fields, and the length of the first and second guard data recording fields is changed randomly in every recording, and the changing amount of the first and second guard data recording fields is set smaller than the changing amount of the first and second guard data recording fields, thereby suppressing optical disc medium deterioration in every sector and every mark resulting from repeated recording.

Optical disc, optical disc device, and method for recording an optical

An optical disc having a plurality of sectors, each sector sequentially comprising a field for recording guard data, a data recording field containing a synchronous signal and following user data, the guard data in the guard data recording field corresponding to a recording pattern of the synchronous signal, and the phase of the recording pattern being continuous at the boundary of the guard data recording field and the data recording field; and a recording method using such discs; and a device for formatting and recording on such discs.

An optical disk device comprises a power ratio setting circuit for setting ratio of recording power to erasing power in a predetermined ratio, a recording start point detection circuit for detecting a recording start point by performing at least two cycle recording over the same area in a predetermined test region to detect a recording power and an erasing power of the recording start point, and a power setting circuit for setting a final recording power and erasing power for recording in a user region of the optical disk by multiplying the recording power and the erasing power of the recording start point by predetermined values respectively.

Optical disk device and method for setting recording power and erasing

A method and an apparatus for recording information signals on an optical information recording medium which is reversibly changeable between optically distinguishable states corresponding to an irradiating condition of a bundle of high density energy such as laser beam. The starting point of recording signals is randomly changed, and the thermal history of the recording material by the beam irradiation is averaged and the number of repetition recording times is improved. A delay circuit is provided, and reference recording gate signals are formed on the basis of format signals obtained from a recording medium, and a random delay time is set just thereafter, and the starting point of recording of recording signals is started.

Method and apparatus for timing variable optical information recording

Herein disclosed is a semiconductor laser control circuit in which: (i) the peak and bottom values of a pulse light can be controlled independently and precisely and set at an optical power value necessary for a high speed; and (ii) the abnormality of the output light of the semiconductor laser can be detected to prevent the stored content of an optical disc, for example, from being broken.

Semiconductor laser control circuit

An optical disk apparatus is disclosed in which data is recorded, reproduced and erased on an erasable optical disk. After first data is recorded in a predetermined track or sector, it is erased. Second data is then recorded in the same track or sector, and it is decided that the erase function is normal when the second data is reproduced correctly.

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Daito, Japan

Shinji Kubota