Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electric Industrial

Shigeaki Furukawa

Kenichi Nishiuchi

Tetsuya Akiyama

Kenji Narumi

Takeo Ohta

Katsumi Kawahara

Noboru Yamada

Kazumi Yoshioka

Hiroyuki Yamaguchi

Masami Uchida

Takashi Ishida

Eiji Ohno

Nobuo Akahira

Kenichi Nagata

Yuuichi Kamioka

Norifumi Oda

Mamoru Shoji

Atsushi Nakamura

Shunji Ohara

Hidemi Isomura

Rie Kojima

Kazuo Inoue

Masahiko Tsukuda

Ken'ichi Nagata

Hideki Kitaura

Tomoyoshi Miyake

The present invention provides an optical information recording apparatus and method capable of effectively determining appropriate recording parameters in a short time with favorable efficiency, when recording information onto an optical disk having different information recording conditions and information recording characteristics. An information recording condition or an information recording characteristic of an optical diskis identified, and a recording pulse position is corrected at a correction accuracy according to the identifies information recording condition or information recording characteristic, such that a recording mark is formed in a predetermined position.

Optical information recording method, optical information recording device and optical information recording medium

Optical information recording method, optical information recording device, and optical information recording medium

A substrate for an optical recording medium includes recording tracks formed in guide grooves on a disc and an address section having an address pit sequence formed between the recording tracks in the guide grooves along an information reading direction of the recording tracks. The recording tracks in the guide grooves are divided into a prescribed number of zones. In each of the zones, the center of the address section corresponding to a recording track in the radially outermost or radially innermost guide groove is disposed so as to shift in a radial direction of the disc in relative relationship to the center of the recording track in the guide groove.

Substrate for optical recording medium, optical recording medium, master disc, master disc recording apparatus, and signal generating apparatus

An optical recording medium of the present invention includes a substrate (), a protection plate (), and a plurality of information layers () sandwiched between the substrate and the protection plate. An information signal is recorded as a length of a mark and a length of a space between two marks. The mark is formed when the information layer is irradiated by light received through the substrate. The information layers have a management region () recording a leading edge recording condition and a trailing edge recording condition. The leading edge recording condition is used to change a recording start position for forming a leading edge of the mark. The trailing edge recording condition is used to change a recording end position for forming a trailing edge of the mark. Each of the leading and trailing edge recording condition is depending on which information layer is recorded.

Optical recording medium, method for recording on optical record medium, and apparatus for recording on optical record medium

A method and an apparatus are provided, which enable a user's standby time to be shortened or utilized effectively in the course of recording/reproduction of information with respect to an optical disk. Information recorded on a disk is reproduced preferentially, and after counting for a predetermined period of time, recording learning is conducted. Alternatively, management information is reproduced preferentially over recording learning, and recording learning is conducted while a user is confirming this information. Alternatively, the possibility of recording on a disk is identified, and reproduction preference or recording learning preference processing is conducted based the possibility. Alternatively, a rotation speed of a disk is controlled to be variable or constant, based on the possibility of recording.

Method and apparatus for recording/reproducing information with respect to optical recording medium

A method by which, in an optical disk recording and reproducing device, the time required for a test recording performed prior to an actual information recording can be reduced according to characteristics of an optical disk. A random pattern signal is transmitted from a random pattern signal generating circuitand recorded on a test track on an optical disk, and a bit error rate of a reproduction signal is measured. Only when a value of the bit error rate is not less than a fixed value, test pattern signals are transmitted from a test pattern signal generating circuitand recorded. An edge timing of a reproduction signal is measured by an edge timing detecting circuitBased on a result of the measurement, edge positions of a front-end pulse and a back-end pulse are corrected.

Method for optically recording information and device for optically recording information by the same

The width W of the address pit () of an optical recording medium of intermediate address type is determined by W=k Tp/(&#x3bb;/NA) where &#x3bb; is the laser wavelength of the optical head of the optical disk device use, NA is the numerical aperture of the objective, Tp is the track pitch of the record medium, and k is 0.40&#x2266;k&#x2266;0.68. Alternatively, an optical device comprises a first address demodulating circuit for demodulating address information by using a signal that is the sum of the electric signals outputted from a pair of photodetectors separated in the direction of the track and a second address demodulating circuit for demodulating address information by suing a signal that is the difference between the electric signals. The address is detected base on the information thus obtained. In such a way, the compatibility of the recording medium used and that of the optical device are improved, the reproduction margin in demodulating the address information is increased, realizing high accuracy address detection when reproducing data from an optical recorded medium of intermediate address type.

Optical recording medium with address information composed of pits

A method by which, in an optical disk recording and reproducing device, the time required for a test recording performed prior to an actual information recording can be reduced according to characteristics of an optical disk. A random pattern signal is transmitted from a random pattern signal generating circuitand recorded on a test track on an optical disk, and a bit error rate of a reproduction signal is measured. Only when a value of the bit error rate is not less than a fixed value, test pattern signals are transmitted from a test pattern signal generating circuitand recorded. An edge timing of a reproduction signal is measured by an edge timing detecting circuit. Based on a result of the measurement, edge positions of a front-end pulse and a back-end pulse are corrected.

An optical recording device comprises: a basic pulse generator including a starting-end pulse generation circuit , a burst gate generation circuit , and an end pulse generation circuit ; a data-length detector including a front mark detector , a front space detector , a recording mark detector , a back space detector and a back mark detector ; a timing controller including a starting-end pulse selecting circuit , a starting-end starting position setting circuit , a starting-end pulse delaying circuit , an end pulse selecting circuit , an end starting position setting circuit and an end pulse delaying circuit ; a pulse synthesizer including an AND gate and an OR gate ; and a laser driver including an erasing current source , a recording current source , and a switch

Optical recording method and optical recording device

An optical recording device comprises: a basic pulse generator including a starting-end pulse generation circuit a burst gate generation circuit and an end pulse generation circuit a data-length detector including a front mark detector a front space detector a recording mark detector a back space detector and a back mark detector a timing controller including a starting-end pulse selecting circuit a starting-end starting position setting circuit a starting-end pulse delaying circuit an end pulse selecting circuit an end starting position setting circuit and an end pulse delaying circuit a pulse synthesizer including an AND gate and an OR gate and a laser driver including an erasing current source a recording current source and a switch

A rewriteable type optical recording medium for recording information has an information recording area for recording information and a recording/reproduction condition recording area for recording at least one recording/reproduction condition to be used in a recording/reproduction apparatus and at least one set of apparatus information for identifying a recording/reproduction apparatus which uses the at least one recording/reproduction condition. A plurality of recording/reproduction conditions and a plurality of sets of apparatus information, each one the plurality of sets of apparatus information corresponding to one of the plurality of recording/reproduction conditions, can be recorded on the rewriteable type optical recording medium and overwritten on the rewriteable type optical recording medium.

OPTICAL RECORDING MEDIUM HAVING AN AREA FOR RECORDING A PLURALITY OF RECORDING/REPRODUCTION CONDITIONS TO BE USED IN RECORDING/REPRODUCTION APPARATUSES AND RECORDING/REPRODUCTION METHOD AND APPARATUS THEREFOR

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Kadoma, Japan

Shigeaki Furukawa