Pioneer Corporation

Akira Shirota

Eiji Muramatsu

Shoji Taniguchi

Kunihiko Horikawa

Naoharu Yanagawa

Hiroyuki Uchino

Masahiro Kato

Yoshio Sasaki

Tohru Kanegae

Eisaku Kawano

Masahiro Miura

Masufumi Asada

An information recording apparatus () is provided with: a recording device () for recording record information onto an information recording medium () by irradiating laser light (LB) with a predetermined power; an adding device () for adding weight to at least one of a plurality of reproduction features associated with the record information; and a controlling device () for controlling the recording device to record the record information with a power in which the at least one reproduction feature with the weight added satisfies a predetermined first reference.

Information recording apparatus and method and computer program

An information recording/reproducing device which can record or reproduce the predetermined information quickly and properly is proposed. An information recording/reproducing devicedetects recording condition of an area in radial direction of an optical mediumusing the rotation angle in a layeras a standard when recording given data in a layerof the optical mediumand on the basis of the detection result, controls power of laser beam irradiated on the layerto record or reproduce given recording data.

Information recording/reproducing device and the like

In an information recording medium including at least a first recording layer (Llayer) capable of recording information and a second recording layer (Llayer) capable of recording information, an information recording device () records information in a predetermined area () of the second recording layer by a laser beam which has passed through a transmission area () of the first recording layer. The information recording medium () includes recording means (, etc.) for recording the information in the first recording layer or the second recording layer, judgment means for judging whether an unrecorded amount indicating the size of the unrecorded area in the radial direction in the transmission area is smaller than a predetermined amount, and control means used when the unrecorded area is judged to be smaller than the predetermined amount, for controlling the recording means to record information in the predetermined area.

Information recording device and method, and recording control computer program

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

A recording apparatus includes: a recording device for recording data onto each of a plurality of types of recording media by irradiating a light beam corresponding to each of the types of recording media; a diffracting device disposed on an optical path of the light beam from the recording device to the recording medium, for generating a main beam and a plurality of sub beams by diffracting the optical beam, the main beam recording data and performing a tracking process, the sub beams performing the tracking process, an amplitude of a tracking signal generated by each or one portion of the sub beams and by the main beam being maximum; a controlling device for controlling the diffracting device to adjust a position on which each of the plurality of sub beams is focused, in accordance with the type of the recording medium; and a tracking device.

Recording apparatus and recording medium, and computer program

An information recording apparatus () is provided with: a first recording device (etc.) for recording the first information into a first area of the first layer; a second recording device (etc.) for recording the second information into a predetermined area of the second layer; and a controlling device () for controlling the second recording device to record the second information by the laser light, while displacing an edge indicating an innermost or outermost circumference of the predetermined area in which a penetrated area penetrated by the laser light is included in the first area, in a direction to approach an edge of the predetermined area in which the penetrated area is not included in the first area, only by a predetermined length corresponding to a tolerance of a change amount indicating a change in the reproduction quality.

Information recording apparatus and method, and computer program for recording control

A recording apparatus for recording record data onto a recording medium on which a plurality of recording layers are formed in a thickness direction, is provided with: a recording device for recording the record data into each of the plurality of recording layers by emitting each of a plurality of recording light beams to be focused on a corresponding one of the plurality of recording layers; a calculating device for calculating a leaked beam feature of another recording light beam, which is emitted to be focused on another recording layer other than one recording layer of the plurality of recording layers, leaking to the one recording layer; and an adjusting device for adjusting an emission condition of at least one of the plurality of recording light beams, on the basis of the calculated leaked beam feature.

Recording apparatus and recording method, and computer program

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

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

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.

The information recording apparatus irradiates a laser beam on a recording medium such as an optical disk and forms a recording mark corresponding to a recording signal to record information. A recording pulse signal includes a mark period irradiating the laser beam for forming the recording mark and a space period in which the recording mark is not formed. The mark period has a top pulse period and an intermediate bias period following the top pulse period. The mark period constituted by the top pulse period and the intermediate bias period does not have a continuous part of a plurality of pulses having a small pulse width unlike a pulse train, so that the correct recording mark can be stably formed on the recording medium without an inadequate deformation of a recording pulse shape, even in the case of a high speed recording.

Information recording apparatus and information recording method

When a bias power level of a recording pulse waveform is varied entirely or partially, a shape of the recording pulse wave form is varied according to the variation. For example, when the bias power level is increased, a width or an edge position of a top pulse or a multi-pulse of the recording pulse waveform is varied correspondingly. Thereby, a total heat quantity of a recording laser light is not increased, and a preferable recording characteristic is maintained.

Based on a recording signal, a recording pulse signal, which includes a top pulse located at a front end portion and having a first magnitude, a last pulse located at a back end portion and having the first magnitude, and an intermediate bias portion located between the top pulse and the last pulse and having a second magnitude, is generated. Based on the recording pulse signal, a light source is controlled, and a laser pulse is irradiated on a recording medium. Recording marks corresponding to the recording signal are formed on the recording medium. In generating the recording pulse signal, when the recording medium is rotationally driven, a position of the top pulse is shifted ahead of a position of the top pulse when the recording medium is rotationally driven at the first rotation speed, when the recording medium is rotationally driven at the second control speed.

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Saitama, Japan

Akira Shirota