Taiyo Yuden Co., Ltd.

Tetsuharu Kubo

Yoshikazu Sato

Hiroya Kakimoto

Fuyuki Miyazawa

Katsuhiro Oyama

Isao Matsuda

Mitsuo Sekiguchi

Ryuichi Sunagawa

It is an object of the present invention to improve a margin to meet good recording quality by conducting a realtime correction of a recording condition of a medium with different recording characteristics for inner and outer circumferences. To accomplish the object, control factors for power and a pulse width are independently detected and corrected using an mT pulse having a length of m'T as a pulse for power control and an nT pulse having a length of n&#x2032;T as a pulse for pulse width control; more specifically, power correction for mT pulse and pulse width correction for nT pulse are conducted in realtime, wherein a recording pulse stream including the mT pulse and nT pulse is irradiated onto a medium by a recording laser beam as well as pits and spaces formed by irradiation of the recording pulse stream are reproduced by a reproducing laser beam to detect the effects of power and pulse width variations independently.

Optical information recording device, optical information recording method, and signal processing circuit

An optical information recording apparatus corrects a recording condition for an optical medium having a difference in recording property between the inner and outer peripheries in real time. The optical information recording apparatus obtains an RF signal by using a playback sub beam and retrieves a portion of the RF signal corresponding to a constant output zone of a recording pulse using a gate signal. An average value of the retrieved signal is computed so as to set a reference position in real time. A difference between the top peak value of the retrieved signal and the average value and a difference between the bottom peak value of the retrieved signal and the average value are computed so as to obtain a &#x3b2; value in real time from the on-and-off RF signal affected by the recording pulse that turns on and off.

Optical information recording apparatus, optical information recording method, and signal processing circuit

The invention provides a method effective in detecting a reproduction signal in real time correction in which correction is simultaneously performed with recording. In this method, a laser beam emitted from a laser diodeis divided into a plurality of beam spots by a diffraction grating. One of the plurality of beam spots is used as a beam spot for recording, and another beam spot is used as a beam spot for reproduction. Reflected light components obtained from these beam spots are independently detected by a detector. A period for which a recording laser beam is in an ON state is referred to as a gate signal, and a mask is put on an RF signal obtained from a beam spot for reproduction, thereby selectively detecting pits reproduced when the recording laser beam is in the ON state.

Optical information recording device for detecting information during recording and method therefor

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Gunma, Japan

Tetsuharu Kubo