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Patent

Optical information recording apparatus for recording an input signal having variable width pulse duration and pulse spacing periods

Eiji Ohno, +5 more
TLDR
In this article, a recording apparatus overwrites an input signal having pulse duration periods and pulse spacing periods to an optical disk by irradiation of a laser beam to form recording marks corresponding to the pulses.
Abstract: 
A recording apparatus overwrites an input signal having pulse duration periods and pulse spacing periods to an optical disk by irradiation of a laser beam to form recording marks corresponding to the pulse duration periods. The apparatus includes a detector for detecting a leading edge of the pulse duration period and for producing a start signal thereupon, another detector for detecting a trailing edge of the pulse duration period and for producing a stop signal thereupon, a pattern setting circuit for setting a predetermined basic pattern, and a pattern generator for generating the basic pattern from its beginning in response to the start signal and for terminating the generation of the basic pattern in response to the stop signal. The apparatus further includes a circuit for forming a modulated signal using a full or portion of the basic pattern produced from the pattern generator. The laser output is produced in accordance with the modulated signal.

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Patent

Information recording method and apparatus with suppressed mark edge jitters

Miyamoto Makoto, +9 more
TL;DR: In this article, an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record ready power level lower than the record level, and the information is recorded on the recording medium in the form of length and interval of a mark portion.
Patent

Optical information recording medium, method of manufacturing the optical information recording medium, and method of and apparatus for recording/reproducing optical information

Katsuyuki Yamada, +12 more
TL;DR: In this article, an optical information recording medium is provided, which at least stores information that indicates a maximum recording linear velocity Vh. The medium comprises a substrate having a concentric circular guide groove.
Patent

Device and method for recording data to optical disk using recording pulse with corrected edge position

Toyoji Gushima, +1 more
TL;DR: In this paper, the authors present a device and method for an optical disc such as a DVD which can keep proper edge position of a recording pulse to record data of high quality without depending on a fluctuation in a supply voltage and temperature.
Patent

Optimum recording laser power control by testing an EFT signal's asymmetry with a frame synchronization circuit

Kazuhiko Honda, +2 more
TL;DR: In this paper, a frame synchronization circuit is used to detect the next synchronizing signal, and a detection timing counter predicts timing when a next synchronising signal will be detected, and then a determination circuit determines an optimum recording power value.
Patent

Phase-change optical recording method using pulse width modulation technique

Hiroko Iwasaki, +4 more
TL;DR: In this article, the conditions of (a and c)>e >(b and d) is satisfied, where b and c is the duty ratio of the pulse section op.
References
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Patent

Semiconductor laser control circuit

Kenji Koishi, +2 more
TL;DR: In this article, 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 the abnormality of the output light of the semiconductor laser can be detected to prevent the stored content of an optical disc from being broken.
Patent

Optical recording system providing a recording signal waveform adapted to the recording characteristics of the record carrier, and recording apparatus and record carrier for use in such systems

Martin Andrew Jacques Patrick Farla, +4 more
TL;DR: In this paper, an optical recording system with adjustment information indicative of the waveform of the write signal was proposed, in which the record carrier is pre-recorded with adjusting information.
Patent

Method for recording information

Keikichi Ando, +19 more
TL;DR: In this paper, the downward pulse added to the pulse waveform of the beam power acts to accelerate the heating and cooling of the recording film of the irradiation region, and the conduction and accumulation of the high heat to and in the outside of this region are effectively prohibited and the undesirable expansion of a recording point is prevented.
Patent

System for recording optical discs for use with optical disc playback only devices

Matsumoto Seiji, +1 more
TL;DR: An optical disc recording system as discussed by the authors can record data on a writable type optical disc and reproduce the recorded data by utilizing a playback device adapted exclusively for playing back a standardized unwritable optical disc such as a Compact Disc.
Patent

Method for recording optical information

Sawano Mitsuru
TL;DR: In this article, the authors proposed a method to prevent a reproducing fault by forming one bit with 3 or more optical pulses and making larger the light radiation energy of a first optical pulse and the LR of a final optical pulse than the LRR of the optical pulse to form the intermediate part of a pit.