Pioneer Corporation

Pioneer Electronic Corporation

Kunihiko Horikawa

Eiji Muramatsu

Shoji Taniguchi

Masahiro Kato

Akira Shirota

Kazuo Kuroda

Toshio Suzuki

Hiroyuki Uchino

Yoshio Sasaki

Atsushi Yamaguchi

Toshihiko Takishita

Naoharu Yanagawa

Hidehiro Ishii

Eisaku Kawano

Yoshitaka Shimoda

Masufumi Asada

A disc-shaped information recording medium includes a first recording layer (L0 layer) having (I) a first trial write area (P-) for trial write of first trial write information for calibration of the laser beam along the first track path (TP) from the inner circumference toward the outer circumference and (II) a first recording area for recording the first recording information along a first track path (TP), in this order from the inner circumference side. Furthermore, the disc-shaped information recording medium includes a second recording layer (L1 layer) having (I) a second trial write area (P-) for trial write of second trial write information for calibration of the laser beam along the second track path (TP) from the outer circumference toward the inner circumference and (II) a second recording area for recording the second recording information along a second track path (TP), in this order from the inner circumference side.

Information recording apparatus and method

A recording device (T or the like) is provided with (i) recording elements () for recording data by irradiating a recording medium with laser beams; (ii) driving members (T,F,T,F,) for performing tracking process or focusing process; (iii) a servo elements (T,F) for automatically controlling the driving members based on an error signal; (iv) specifying elements () for specifying an area where a recording medium characteristic (core eccentricity or the like) is not good, based on a high frequency component included in the error signal; and (v) a control unit () for (v-i) controlling the servo unit to change the gain in the automatic control, and for (v-ii) controlling the recording elements to change the recording power of the laser beams, in the specified area.

Recording device and method, reproducing device and method, recording/reproducing device and method, and computer program

An information recording medium () is provided with: a first recording layer (L0 layer) having a first calibration area (-) in which test information for calibrating a power of laser light in recording record information can be recorded; and a second recording layer (L1 layer) having a second calibration area (-) in which the test information can be recorded and in which at least one portion of a recording area faces the first calibration area, wherein the first calibration area and the second calibration area including a space area (U-U-) having a predetermined size in positions facing each other, the test information is recorded in a recording area (R-) located on one side, centered on the space area, in the first calibration area, and the test information is recorded in a recording area (R-) located on other side which is opposite to the one side, centered on the space area, in the second calibration area.

Information recording medium, information recording device and method, and computer program

Based on actual recording power information obtained during test writing, a recording power is efficiently controlled with high accuracy during actual recording. An information recording apparatus irradiates a laser light onto an information recording medium such as an optical disc to record data and reproduce the recorded data. In recording actual data such as data designated by a user, the information recording apparatus temporarily stops recording at the time when predetermined amount of data is recorded, and confirms recording quality. Namely, the apparatus reproduces the recorded data and determines the recording quality based on the reproduced data. When it is determined that the recording quality is within an appropriate range, the recording of the actual data is continued at the recording power. Meanwhile, when it is determined that the recording quality is out of the appropriate range, the recording power is corrected so that the recording quality becomes within the appropriate range, and the actual data is recorded. Thereby, even when the optimum recording power is changed due to some causes and condition change after recording start of the actual data, the recording power can be correspondently corrected, and accurate information recording with the appropriate recording power can be realized.

Information recording device, information recording method, and information recording program

An information recording medium includes: Each recording layer has a predetermined area in which power calibration is performed to detect an optimum recording power of laser light for recording, which is transmitted through the first recording layer and other layers of the second recording layers, the first recording layer, the other layers of the second recording layers, and each of the second recording layers arranged in this order as viewed from an irradiation side of the laser light, and in a facing area, which faces the predetermined area, in the other layers of the second recording layers and the first recording layer, by forming embossed pits.

Information recording medium and information recording device and method

An information recording device, an information recording method, and an information recording program capable of recording information with an appropriate modulation degree, a high asymmetry, and small waveform distortion. The information recording device applies a laser beam to a recording medium such as a DVD-R/RW and DVD+R/RW and forms a recording mark corresponding to a recording signal, thereby recording information. A recording pulse signal for forming the recording mark corresponding to the recording signal has a mark period for forming the recording mark and a space period not forming the recording mark. In test recording performed prior to actual information recording, a long mark recording power is kept constant while a short mark recording power is changed. Preferably, the short mark recording power in the test write is changed so that the asymmetry and/or the beta value is a value within a desired range.

An information recording device and method capable of forming a recording mark by suppressing thermal interference. The device applies a laser beam to a recording medium and forms a recording mark in accordance with a recording signal. The device includes a light source for emitting the laser beam, signal generation elements for generating a recording pulse signal according to the recording signal, and drive elements for driving the light source according to the recording pulse signal. The recording pulse signal has a mark period for forming the recording mark and a space period. The recording pulse signal makes the level in the entire space period equal to or shorter than a predetermined length and a part of the space period longer than the predetermined length to be off level. While the recording pulse signal is off level, the recording medium is cooled down, thereby suppressing the affect of thermal interference.

Information recording device and information recording method

A disc-shaped information recording medium includes a first recording layer (Llayer) having (I) a first trial write area (P-) for trial write of first trial write information for calibration of the laser beam along the first track path (TP) from the inner circumference toward the outer circumference and (II) a first recording area for recording the first recording information along a first track path (TP), in this order from the inner circumference side. Furthermore, the disc-shaped information recording medium includes a second recording layer (Llayer) having (I) a second trial write area (P-) for trial write of second trial write information for calibration of the laser beam along the second track path (TP) from the outer circumference toward the inner circumference and (II) a second recording area for recording the second recording information along a second track path (TP), in this order from the inner circumference side.

Information recording medium, and information recording apparatus and method

An information recording apparatus for recording information onto an information recording medium having a plurality of recording layers, by irradiating the information recording medium with laser light for recording, the information recording apparatus including: a setting device for setting a preferable irradiation condition of the laser light which is preferable to one recording layer in which the information is scheduled to be recorded, out of the plurality of recording layers, for each recording state of another recording layer out of the plurality of recording layers; and an irradiating device for irradiating the one recording layer with the laser light in the set preferable irradiation condition.

Information recording apparatus and method, and information recording medium

An information recording apparatus () is provided with: a recording device () for irradiating an information recording medium () with laser light and for recording information onto the information recording medium; an obtaining device () for obtaining at least one of (i) a special OPC strategy for defining a waveform of the laser light used to calculate an optimum laser power of the laser light for recording the information at a second recording speed different from a first recording speed, at the first recording speed, and (ii) a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed; a power calculating device () for calculating the optimum laser power by using the special OPC strategy at the first recording speed; and a controlling device () for controlling said recording device to record the information at the second recording speed, by using the calculated optimum laser power and the recording strategy.

Defining from a first recording speed a second recording speed for recording on an information recording medium

An information recording apparatus for recording information with less waveform deformation with an adequate modulation degree and with a high asymmetry, an information recording method, and an information recording program. An information recording apparatus in which a laser beam is applied to a recording medium and a recording mark corresponding to a recording signal is formed includes a light source for emitting a laser beam and signal generating means for generating a recording pulse signal for driving the light source according to the recording signal. The recording pulse signal includes a mark period during which a recording mark is formed and a space period during which no recording mark is formed. During the mark period corresponding to a long mark, the level of the recording pulse signal corresponds to a recording power with which the reproduction compatibility is ensured and the waveform distortion is at or below a predetermined value.

Information recording apparatus, information recording method and information recording program

An information recording apparatus () is provided with: a recording device () for recording record information onto an information recording medium by irradiating the information recording medium () with laser light with a recording power according to a set value; a calculating device () for preparing correlation information which represents a correlation between the set value and reproduction quality, and for obtaining a reference set value which gives target reproduction quality as being desired reproduction quality, by reproducing test-record information recorded with changing the set value on the recording device; a measuring device () for measuring the reproduction quality, by reproducing the record information recorded by using the reference set value on the recording device; and an adjusting device () for obtaining adjustment amount of the reference set value on the basis of the correlation information if the reproduction quality measured by the measuring device is different from the target reproduction quality, and for adjusting the reference set value such that a set value which is adjusted based on the adjustment amount is to be a new reference set value.

Information recording medium, information recording device and method, information recording/reproducing device and method, and computer program

An information recording apparatus is provided with: a recording device for recording information onto an information recording medium; a detrack detecting device for detecting occurrence of detrack during the recording of the information; and a controlling device for controlling the recording device to return to a location where the detrack has occurred and restart the recording if the occurrence of the detrack is detected.

Information recording device and method, and computer program

The present invention provides a recording pulse generating apparatus capable of forming a recording pit having a proper shape even at the time of ultra-high-speed recording of, for example, 8&#xd7;recording or higher. A recording controllerfor generating recording pulse signals having lengths corresponding to ten kinds of lengths of pits formed at the time of recording information has a recording controllerfor generating the recording pulse signals so that the amplitude of a recording pulse signal corresponding to a pit having a length of 4T changes from a first amplitude to a second amplitude, and generating the recording pulse signals so that the amplitude of a recording pulse signal corresponding to a pit having a length of 5T or longer changes from a third amplitude to a fourth amplitude and further changes to a fifth amplitude.

Recording pulse generating apparatus and information recording apparatus

The present invention provides a recording pulse generating apparatus capable of forming a recording pit having a proper shape even at the time of ultra-high-speed recording of, for example, 8&#xd7; recording or higher. A recording controllerfor generating recording pulse signals having lengths corresponding to ten kinds of lengths of pits formed at the time of recording information has a recording controllerfor generating the recording pulse signals so that the amplitude of a recording pulse signal corresponding to a pit having a length of 4T changes from a first amplitude to a second amplitude, and generating the recording pulse signals so that the amplitude of a recording pulse signal corresponding to a pit having a length of 5T or longer changes from a third amplitude to a fourth amplitude and further changes to a fifth amplitude.

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Saitama, Japan

Kunihiko Horikawa